JP3833693B2 - Injection mold design method - Google Patents

Description

  The present invention relates to a method for designing an injection mold, and more particularly, to a method for designing a mold used for manufacturing an injection molded product of resin (plastics).

  In recent years, plastics are often used as housing materials for electrical products and the like due to the diversification of product designs and user usage, because they look good and can be freely shaped. In addition, by manufacturing the casing by resin injection molding, seats and bosses (projections) for mounting the printed circuit board and other components, ribs for reinforcement, and the like are formed integrally with the casing. This also has the advantage that the number of parts can be reduced and the assembly can be simplified.

  FIG. 96A shows an example of a molded product (product) manufactured by resin injection molding. In FIG. 96A, reference numeral 1 denotes a molded product used as a casing of a portable electronic device or the like, and 2 denotes a hole provided in the molded product 1. The molded product 1 having such a shape is manufactured by using a mold having a cavity having the same shape as that of the product, filling the cavity with a molten resin, and then curing the resin. At this time, the hole 2 is formed by using a so-called nested part arranged in the mold.

  FIG. 96 (B) shows a block diagram of the mold. In FIG. 96 (B), 3 is a cavity (female mold) that defines the outer shape of the molded article 1. Reference numeral 4 denotes a core (male mold) that defines the inner shape of the molded product 1. When these cavities 3 and the core 4 are superposed, a product-shaped cavity to be manufactured is formed inside.

  FIG. 96 (C) shows a block diagram of an injection molding apparatus equipped with a mold. The cavity 3 and the core 4 are attached to the cavity plate 3A and the core plate 4A, respectively, and are arranged to face each other in the vertical direction. The cavity plate 3A is driven by a driving device (not shown) to move in the vertical direction. Reference numeral 6 denotes a gate (pouring gate) provided in the mold, and the resin 7 is filled into the mold cavity through the gate 6. Reference numeral 5 denotes a runner stripper plate provided with a runner (not shown) for guiding the resin 7 into the mold space. The runner stripper plate 5 is disposed on the cavity plate 3A so that the resin cured by the runner can be removed away from the cavity plate 3A when the mold is opened.

  Reference numeral 8 denotes a gas vent (gas vent hole) provided in the mold in order to vent the air in the mold space to the outside when the resin is poured into the mold space. Reference numeral 9 denotes a cold water channel provided in the mold. Since the resin filled in the mold is heated to several hundred degrees Celsius, filling the resin raises the temperature of the mold and not only lowers the molding efficiency (molding cycle) but also warps the product. Or it may cause problems such as twisting. For this reason, water is poured into the cooling passage 9 to cool the mold. Usually, the cold water channel 9 is provided on the core 4 side.

  Reference numeral 10 denotes an extruding unit for extruding the molded product 1 from the core 4. The extruding part 10 has a rod-like member called an eject pin, and the molded product 1 is pushed out from the core 4 by inserting the eject pin into an insertion hole provided in the core 4.

  By the way, since the injection mold is composed of the cavity 3 and the core 4 as described above, the mold is divided into the cavity 3 side and the core 4 side when designing the mold. This divided surface is called a parting surface. When the product to be manufactured has an undercut portion, if the setting of the parting surface is wrong, the molded product cannot be taken out from the mold. In addition, an undercut part means the part which becomes caught with respect to a mold opening direction, when taking out a product from a metal mold | die. When there is an undercut portion, it is necessary to consider such as providing a slide structure in the mold.

  Further, in order to make it easy to extract the product from the mold, the mold is provided with a slight gradient (draft gradient) to avoid the inner surface of the mold from being perpendicular to the parting surface.

  Conventionally, in the case of a mold having a relatively simple shape, a designer designs a mold in consideration of a parting surface and a draft angle based on a product drawing. However, since it is difficult to represent the product shape in a drawing for a product that uses many free-form surfaces with high design properties, first create a product model (model) and then mark the outline of the product model. The product shape is converted into numerical data by digitizing the points and correlated with each other. NC (numerical control) data and electric discharge machining electrodes for cutting are created based on the numerical data. And the metal mold is manufactured using the electric discharge machining electrode.

  Further, a mold may be designed using a three-dimensional CAD (Computer-Aided Design) device. In this case, the product shape data is input to the CAD device, and the product shape or a die block having a cavity corresponding to the product shape (the virtual block displayed on the screen indicates the outer shape of the die) is displayed. Displayed above, the designer sets the parting line for forming the parting surface while looking at the display, or sets the surface to provide the draft angle, and the CAD device is based on these set conditions. Output numerical data to form a mold.

  However, in the method in which the designer designs the mold based on the design drawing, as described above, the designer needs to design the mold while taking into account the undercut and draft angle. As for thing, it becomes difficult for a designer to judge a three-dimensional product shape from drawing. For this reason, this method has a problem that the number of man-hours for design increases and a design error tends to occur. In addition, in the method of creating mold manufacturing data from a product model, there is a problem that a product model with an accurate shape is required, skill is required, and it takes a long time to create a product model.

  Furthermore, even in the method using a three-dimensional CAD apparatus, it is necessary for the designer to set the parting surface, draft angle, etc. based on the image displayed on the display, which is complicated and requires skill. In addition, a design error is likely to occur due to a cause such as the designer overlooking the undercut portion.

  The present invention was created in view of the problems of the conventional example, and an object of the present invention is to provide an injection mold design method that allows a mold to be designed easily in a short time.

  The design method of the present invention includes a correction step in which the control unit corrects the product shape to a shape that can be punched while displaying the product shape or the mold shape on the screen, and the control unit corrects the corrected product shape. A dividing step of arranging in a mold block displayed on a screen and providing a cavity corresponding to the product shape in the mold block, and then dividing the mold block into a core and a cavity; A step of displaying a mold resin flow analysis result superimposed on a perspective view of the mold viewed from the opening direction, and arranging a gas bend for extracting gas at a position where the resin finally reaches from the flow analysis result In the correction step, the control means obtains a normal vector of the surface of the product shape and a reference vector in the mold opening direction, and detects a normal vector opposite to the reference vector. Characterized in that comprises the step of detecting an undercut portion by.

  In the method of designing an injection mold according to the present invention, the normal vector of the surface of the product shape is compared with the reference vector in the mold opening direction, and an undercut is detected by detecting the normal vector in the direction opposite to the reference vector. Part. That is, in the undercut portion, there is a surface having a normal vector in the opposite direction to the reference vector. In the present invention, an undercut portion is automatically detected using such a property.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 to 95 are explanatory diagrams of an injection mold designing apparatus and a designing method thereof according to an embodiment of the present invention.

  FIG. 1 shows a configuration diagram of a plastics injection mold design apparatus according to an embodiment of the present invention. In FIG. 1, 11 is a design data memory (storage means) for storing product shape data (image information) D1 for displaying a three-dimensional view and a projected view of a product to be manufactured. The data D1 is binarized data.

  Reference numeral 12 denotes a base file that stores mold base data D2 in which the shapes of cavities and core parts, and plates and fixing parts to which the cavities and core parts are attached (screws, eject pins, cold water channels, etc.) are databased.

  Reference numeral 13 denotes a work memory that stores image information (data D1 to D6, etc.) of a mold model and a product model generated during the design. D3 is element data such as a line element of the product (data such as the length curvature and angle of the line constituting the product shape) and a surface element (data such as the size, curvature and angle of the surface constituting the product shape), D4 is cavity / core data indicating the shape of the cavity and core, D5 is image data necessary for display on the display 19, and D6 is input data such as control statements.

  14 is a product shape correction editor for correcting the product shape in order to make it easy to remove the product from the mold. This product shape correction editor includes, as software, a parting line creation unit 41, a draft surface addition unit 42, a shrinkage rate correction unit 43, and the like. The parting line creation unit 41 extracts parting line candidates from the product shape data D1, creates a parting line, detects an undercut part of the product shape, edits the parting line (position coordinates are This is the part that collects continuous parting lines and regroups them into the same group) or loops the parting lines. Further, the draft surface imparting section 42 detects a surface that needs to be imparted with a gradient in order to easily extract a product from the mold and a surface that is preferably imparted with a gradient (hereinafter referred to as a gradient imparting surface). It is a part for adding a draft to the detected gradient application surface and checking whether the molded product is easily separated from the mold. Further, the shrinkage rate correction unit 43 examines the change in dimensions of each part of the product when the resin hardens in the mold based on the shrinkage rate when the resin hardens. For example, the product sandwiches the convex portion of the core. It is a part that detects whether there is a part that cannot be removed from the core. When such a location is detected, a process such as partially changing the shape of the mold or applying a draft to the surface of the corresponding location by the draft applying unit 42 is performed.

  Reference numeral 15 denotes a cavity design editor for designing a mold cavity, and includes a cavity / core arrangement unit 51, a mold division unit 52, and the like as software. The mold dividing unit 52 includes a slide dividing unit 501 and a nested dividing unit 502. The cavity / core arrangement unit 51 creates a mold block such as a rectangular parallelepiped or a cylinder larger than the product shape on the screen, and creates a cavity having a shape equal to the product shape in the mold block. Further, the mold dividing unit 52 creates a main parting surface based on the parting line candidates extracted by the above-mentioned parting line creating unit 41, or divides a mold block on this main parting surface to create a cavity. And core on the screen. Further, the slide dividing unit 501 has a function of creating a slide surface that divides the cavity or the core so as to make the undercut portion a slide structure, and checking interference between the cavity and the core. Further, the nesting division unit 502 creates a parting line for creating the core side nesting according to the depth of the mold, assigns a priority to the parting line for dividing the core, Or create a nesting.

  Reference numeral 16 denotes a plate design editor for designing structural parts necessary for the mold. As software, a mold base arrangement unit 61, a gate design unit 62, a runner design unit 63, a sprue design unit 64, a gas vent design unit 65, an ejector pin A design unit 66, a temperature adjustment structure design unit 67, a movable structure design unit 68, and the like are included. The mold base placement part 61 is a part for designing a part for fixing a mold such as a mold base. The gate design unit 62 is a part that designs the position, shape, size, and the like of the gate. Furthermore, the runner design part 63 is a part for designing the shape and arrangement of the runner for introducing the resin from the lateral direction of the mold. Furthermore, the sprue design part 64 is a part for designing the shape and arrangement of the sprue (runner) for introducing the resin into the runner from the longitudinal direction of the injection molding apparatus. The gas vent design unit 64 is a part for designing the shape, position, size, and the like of the gas vent for extracting air from the mold when the resin is injected into the mold. The ejector pin design unit 65 is a part that designs the shape and arrangement of the ejector pins for extruding a molded product from the mold. The temperature adjustment structure design unit 67 is a part that designs a cooling path for cooling the mold. The movable structure design unit 67 is a part for designing a drive system (link structure) such as a runner stripper plate, a cavity plate, and a core plate.

  Reference numeral 17 denotes a keyboard (input means) for a designer to input a control statement or the like as input data (designated information) D6 and input the design statement to the design apparatus or to instruct screen switching. An auxiliary input tool such as a mouse is connected to the keyboard 17 so that a product or a mold on the screen can be rotated by operating a mouse or a numeric keypad.

  18 controls input / output of the design data memory 11, base file 12, work memory 13, product shape correction editor 14, cavity design editor 15, plate design editor 16, keyboard 17, display 19, printer 20 and other memory 21. CPU (central processing unit). The CPU 18 temporarily saves in the work memory 13 data of lines or surfaces that hinder the correction of the shape of the product or mold displayed on the screen in accordance with the designation information input via the keyboard 17. In addition, after the line or surface is removed from the screen and the shape correction of the product or mold is completed, the line or surface is redrawn on the screen.

  Further, the CPU 18 stores a history file generated in each design work in the work memory 13. For example, the CPU 18 stores five history files of data generated in each function editor in the work memory 13 in the order of 1 to 5 in time series. In this case, it is assumed that creation data of a fillet (reinforcing material provided at a portion where two or more surfaces contact) is stored in the history file 3, and data at the time of drafting is stored in the history file 5. It is assumed that the fillet is in the way and it is difficult to give a draft. In this case, the CPU 18 returns to the history file 3 before creating the fillet, and executes the draft addition using the data of the history file 5. Thereafter, the history file 3 and the history file 4 are automatically used to return to the history file 5.

  Reference numeral 19 denotes a display (display means) that reads out image information from the design data memory 11, the database memory 12 or the work memory 13 and displays a product model or a mold three-dimensionally or two-dimensionally, and includes a CRT (Cathode-Ray Tube), A liquid crystal display or a plasma display.

  In this design apparatus, in order to make it easy for the designer to recognize the three-dimensional shape of the product, a three-dimensional diagram (such as an isometric diagram) as shown in FIG. In FIG. 2A, 1 is an example of a product to be manufactured. The product 1 is provided with ribs 1A for reinforcement, bosses 1B for mounting components such as printed boards, holes 1C for mounting external terminals and the like.

  FIG. 2B shows a diagram for explaining the types of design drawings that can be displayed on the display 19. (1) is a top view of the product 1. FIG. 3A shows a top view of the product 1. (2) is a front view of the product 1, and FIG. 3 (B) shows the product 1 as viewed from the front. (3) is a rear view of the product 1, (4) is a right side view, and (5) is a left side view. FIG. 3C shows a left side view of the product 1. (6) is a bottom view of the product 1. (7) is a right front isometric view in which the product 1 is three-dimensionally displayed, (8) is a left front isometric view, (9) is a right rear isometric view, and (10) is a left rear isometric view.

  The display 19 can display the three-dimensionally displayed screen (child screen) in combination with the two-dimensionally displayed screen (parent screen) by combining these ten kinds of design drawings. That is, during draft design, nesting division design, parting surface design, gate design, runner design, ejector pin design, and gas vent design, any one of (7) to (10) of product 1 is displayed on the display 19. An isometric view and plan views (1) to (6) can be displayed simultaneously. Further, in the cavity / core division design, the cooling path design, and the link design, the display 19 has an isometric view of any of (7) to (10) of the product 1 and a plane of (2) to (5). The figure can be displayed at the same time. In this design apparatus, these design drawings are displayed using a three-dimensional CAD tool, a CG (Computer Graphics) tool, or the like.

  Further, the present design apparatus has a function of temporarily deleting lines or surfaces that obstruct the correction work from the screen when correcting the product shape. For example, when correcting the shape of the product 1, the fillet portion 1D of the product 1 in FIG. 4A is deleted from the screen and an isometric diagram as shown in FIG. 4B is displayed. When the correction is completed, the fillet portion is redrawn on the screen.

  Reference numeral 20 denotes a printer which outputs the shape of a mold part and its dimensions on a paper surface.

  Reference numeral 21 denotes other memory. The memory stores design items for facilitating handling of the mold design system, a configuration file that supports the design system, and default values necessary for designing the mold parts. The memory 21 uses a read-only memory capable of rewriting and erasing data. ERPOM and EEPRPOM are suitable. The design items will be described in the twentieth embodiment. The method of using the configuration file will be described in the twenty-sixth embodiment.

  Next, the operation of the injection mold designing apparatus according to the embodiment of the present invention will be described. First, the designer operates the keyboard 17 to read the image information of the product 1 from the design data memory 11 and display a three-dimensional view or projection view of the product 1 or the mold on the display 19. At this time, the designer operates the keyboard or the like to temporarily save the data of lines or surfaces that hinder the correction of the shape of the product 1 or the mold in the work memory 13, and these lines or surfaces are displayed on the screen. You can delete it to make it easier to see the information you need.

  Accordingly, the designer can correct the shape of the product 1 or the mold while looking at the screen on which only the lines and surfaces necessary for the shape correction are displayed.

  Thereafter, for example, when the designer corrects the shape of the product 1, first, a designer temporarily creates a plane for projecting the shape of the product 1 on the screen. Next, a new straight line or curve is set on this plane. Then, this straight line or curve is projected onto the product 1. The new straight line or curve projected on the product 1 is extracted as a parting line candidate for dividing the mold block into a core and a cavity.

  Further, when correcting the shape of the product 1, a plane for projecting the contour line, the ridge line, or the boundary line of the surface of the product 1 is temporarily created. Next, a boundary line of a contour line, a ridge line, or a surface element is set on a plane. The newly set contour line, edge line, or boundary line of the surface element is projected onto the product 1. Then, the new contour line, the ridge line, or the boundary line of the surface element projected on the product 1 is extracted as a boundary line candidate for dividing the mold block into the core and the cavity.

  If the parting line candidates are extracted in this way, even if the shape of the product 1 changes during the design due to the shrinkage correction of the product 1 or the provision of a draft, the contour line, ridge line, or A parting line necessary for dividing the mold block into the core and the cavity can be prepared based on the boundary line of the surface element.

  Accordingly, the designer can interactively correct the shape of the product 1, extract the parting line, give a draft angle, and the like while displaying the three-dimensional view and the projected view of the product 1 on the display 19.

  Then, after the shape correction of the product 1 or the mold model is completed, the CPU 18 draws the line or surface on the screen using the data saved in the work memory 13 according to the designation of the designer.

  Next, an injection mold design method according to the present invention will be described with reference to FIGS. 1 to 95, including the operation of the design apparatus. 5 to 7 show a flow chart (main routine) for designing an injection mold. A more detailed operation in each step will be described in an embodiment described later.

  In FIG. 5, first, in step P1, the parting line creation unit 41 of the product shape correction editor 14 extracts main parting line candidates for dividing the mold block into cores and cavities from the product shape (first). 1 embodiment).

  Next, in step P2, the draft surface giving unit 42 detects a surface that needs to be given a gradient from the product shape (see the second embodiment).

  Next, in step P3, the draft surface giving unit 42 gives priority to the draft surface (see the third embodiment). Thereafter, in step P4, the draft angle imparting section 42 imparts a draft to the product shape (see the fourth embodiment).

  In step P5, the parting line creation unit 41 creates a main parting line based on the main parting line candidates extracted in step P1 (see the fifth embodiment).

  Next, in step P6, the parting line creation unit 41 performs a loop check of the main parting line (see the sixth embodiment). At this time, if the parting line does not become a closed loop (NG), the process returns to step P5 to recreate the main parting line.

  When the parting line becomes a closed loop in step P6 (GOOD), the process proceeds to step P7, and the parting line creation unit 41 extracts an undercut part from the product shape (see the seventh embodiment).

  Thereafter, the process proceeds to step P8, where the parting line creation unit 41 creates a parting line for sliding. This sliding parting line is necessary when creating a parting surface for dividing the undercut portion into nested parts. Next, the main parting line is edited in step P9. The editing of the main parting line is performed when the main parting line needs to be changed because the slide core parting line has been created, and substantially the same processing as step P5 is performed.

  Next, in step P10, the parting line creation unit 41 checks the loop of the main parting line again. At this time, if the parting line does not become a closed loop (NG), the process returns to Step P8 to recreate the sliding parting line. If it is GOOD at step P10, the process proceeds to step P11.

  Next, in step P11, the draft surface imparting unit 42 checks the releasability of the product shape (see the eighth embodiment). Here, the projecting output of the ejector pin and the contraction force of the product shape are compared. If the ejector pin projection output is equal to or less than the contraction force of the product shape (NO), the process returns to Step P4 and the draft is given again. If the ejector pin projection output exceeds the contraction force (YES), the process proceeds to Step P12.

  In step P12, the shrinkage rate correction unit 43 corrects the shrinkage rate of the product shape. That is, since the shrinkage rate varies depending on the resin, it may be necessary to newly set a draft depending on the resin. In step P12, the deformation amount of the product shape is obtained based on the shrinkage rate of the resin. Thereafter, the designer determines whether or not to locally change the product shape in Step P13. Here, when the product shape is locally changed (YES), the process proceeds to step P14 to locally change the shape of the product 1 (new setting of the draft, etc.). If it is determined in step P13 that the product shape is not locally changed (NO), the process proceeds to step P15.

  In Step P15, the cavity / core arrangement unit 51 of the cavity design editor 15 starts creating a mold block. Thereafter, in step P16, the cavity / core arrangement unit 51 reads the product shape data D1 from the work memory 13. Next, in step P17, the product shape and the mold block are superimposed and displayed on the display 19.

  Next, in step P18, the size and shape of the mold block are checked. Here, when it is determined that the size and shape of the mold block are inappropriate by the designer (NG), the process proceeds to Step P19. In step P19, the cavity / core arrangement unit 51 changes and displays the dimensions of the mold block. If it is determined in step P18 that the blank size and shape are suitable (GOOD), the process proceeds to step P20.

In Step P20, a portion corresponding to the product shape in the mold block is hollowed in the cavity / core arrangement portion 51. The hollowing of the product shape portion is performed by reversing the product shape portion and the cavity portion (actual air reversal function) by executing a Boolean operation in the cavity core arrangement portion 51. Cavity / core data D4 obtained by Boolean calculation by the cavity / core placement unit 51 is stored in the work memory 13. Here, an isometric diagram as shown in FIG. 8 is displayed on the display 19. In FIG. 8, 100 is a mold block.
100A is a part which becomes a mold cavity.

  Next, in step P21, a mold parting section 52 creates a main parting surface for dividing the mold block 100 (see the ninth embodiment).

  Thereafter, in step P22, the mold dividing unit 52 starts the process of dividing the mold block 100 into cavities and cores, and then in step P23, a slide parting line is created. Thereafter, in step P24, the mold dividing unit 52 creates a slide parting surface based on the slide parting line.

  In step P25, the slide dividing unit 501 gives a slide parting surface to the mold block 100 to divide the mold block 100 into a cavity and a core. Here, the display 19 displays an isometric diagram obtained by dividing the cavity 3 and the core 4 as shown in FIG.

  Next, in Step P26, it is detected whether or not the cavity 3 and the core 4 interfere with each other in the mold dividing unit 52 (mold opening interference check). Here, when it is determined that the mold cannot be opened due to interference between the cavity 3 and the core 4 (NG), the process proceeds to Step P27 and the mold dividing unit 52 performs the parting line or parting. Redo face editing. When it is determined that there is no interference between the cavity 3 and the core 4 and the mold can be opened (GOOD), the process proceeds to Step P28. The mold opening interference check is determined based on whether or not the coordinate value of a certain line element is covered by the other line element.

  Next, in step P28, a parting line for dividing the cavity 3 or the core 4 (usually the core) is created based on the depth of the mold in the nested dividing section 502. This is a case where the cavity 3 and the core 4 are divided and the mold is configured by nesting, and if the product shape is relatively simple, it is not necessary to have a nesting structure.

  Next, in step P29, the nesting division unit 502 gives priority to the parting lines for nesting. Thereafter, in step P30, the nesting division unit 502 creates a nesting parting surface.

  In the present embodiment, three types of nesting parting surfaces are prepared in advance: a planar push-off structure as shown in FIG. 10A, an in-row structure as shown in FIG. 10B, and a positioning push-off structure. The designer may select one of these structures. This eliminates the need for the designer to input various data to the apparatus, makes it possible to easily design a nested part for forming the undercut portion of the product 1, and remarkably reduce the burden on the designer. .

  Then, in accordance with the instructions of the designer, in step P31, the nest division unit 502 divides a part of the cavity 3 or the core 4 into one or a plurality of nests (see the tenth and eleventh embodiments). For example, the designer designates a cross-sectional view of the nesting while checking the nesting on the isometric view of the mold as shown in FIG. Then, the division direction of the nesting as shown in FIG. After that, an isometric view before and after the nesting division is displayed on the display 19 as shown in FIG. Then, as shown in FIG. 12B, the display 19 displays three nestings 1 to 3 that divide the core 4 by the parting surface. Further, the display 19 displays a top view of the three nestings 1 to 3 projected on the parting surface along with a sectional view of the nesting. In FIG. 12B, the shaded portion is the deepest surface of the mold. In this way, the part of the product 1 where the hole or the like is formed can be a nested structure.

  Next, in step P32, a mold base for supporting the mold is arranged in the mold base arrangement unit 61 of the plate design editor 16 (see the twelfth embodiment).

  Next, in step P33, the gate design unit 62 designs a gate (see the thirteenth embodiment). In this case, in the present embodiment, a plurality of types of gate shapes and the like are recorded in the database 12 as patterned data, and the designer selects the gate type according to the procedure displayed on the screen. Alternatively, the gate can be designed by inputting a numerical value.

  Thereafter, in step P34, the runner design unit 63 designs a runner (see the fourteenth embodiment). In this case as well, in this embodiment, patterned data such as a plurality of types of runners are recorded in the database 12, and the designer selects the type of runner according to the procedure displayed on the screen. Or you can design a runner by entering numerical values.

  Next, in step P35, the sprue design unit 64 designs a sprue. Also in this embodiment, in the present embodiment, a plurality of types of sprue shapes and the like are recorded in the database 12 as patterned data, and the designer selects the type of sprue according to the procedure displayed on the screen. Or you can design a sprue by entering numerical values.

  In step P36, the gas vent design unit 65 designs a gas vent (see the fifteenth embodiment). Also in this embodiment, in the present embodiment, a plurality of types of gas vent shapes and the like are recorded in the database 12 as patterned data, and the designer selects the type of gas vent according to the procedure displayed on the screen. Or, a gas vent can be designed by inputting a numerical value.

  Further, in step P37, the ejector pin design unit 66 designs the shape, size, position, and diameter of the ejector pin hole provided in the core (see the sixteenth embodiment). In this case as well, in this embodiment, the shape and the like of a plurality of types of ejector pins are recorded in the database 12 as patterned data, and the designer selects the types of ejector pins according to the procedure displayed on the screen. The ejector pin can be designed by selecting or inputting a numerical value.

  Thereafter, in step P38, the temperature adjustment structure design unit 67 designs the hole shape, position, and the like of the cooling path (see the seventeenth embodiment). Also in this embodiment, in the present embodiment, a plurality of types of cooling channel shapes and the like are recorded in the database 12 as patterned data, and the designer selects the type of cooling channel according to the procedure displayed on the screen. The cooling path can be designed by selecting or inputting a numerical value.

  In step P39, the movable structure design unit 68 designs a “link structure” for connecting the runner stripper plate, the cavity plate, and the core plate (see the eighteenth embodiment). In this case as well, in this embodiment, a plurality of types of link structures are recorded as patterned data in the database 12, and the designer selects the type of link structure according to the procedure displayed on the screen. The link structure can be designed by inputting numerical values.

  A plastics injection mold can be designed through each step of the main routine of such a design apparatus.

  Next, the functional units of the product shape correction editor 14, the cavity design editor 15, and the plate design editor 16 of the design apparatus according to the present invention will be described separately for each embodiment.

(1) 1st Embodiment FIG. 13: has shown the detection flowchart of the outline of the outermost periphery and through-hole of the product which concerns on the 1st Embodiment of this invention. In this process, the parting line creation unit 41 extracts parting line candidates from the shape of the product 1.

  First, in step P1, the design apparatus reads the product shape data D1 from the design data memory 11, and displays the product shape on the display 19 in a stereoscopic display as shown in FIG. Next, in step P2, the designer inputs the mold opening direction of the product shape from the keyboard. If it does so, it will transfer to step P3 and a design apparatus will switch the display of the display 19 to the top view seen from the type | mold opening direction. The reason for switching to the top view in this way is that the parting line is often the outermost contour of the product shape viewed from the mold opening direction. The parting line detected in the top view can be made easier to see for the designer by changing to the three-dimensional display again. In addition, when the mold opening direction is not determined as one, a side view and a bottom view of the product 1 are displayed on the display 19.

  Thereafter, in step P4, the top view displayed on the display 19 is displayed in a shaded manner in order to clarify the boundary of the product shape. Shading display means changing the color tone of the screen. For example, the display 19 displays the outline of the product 1 with the inside black or the outside white.

  In step P5, the product shape data is binarized (that is, the black portion on the screen is set to “0” and the white portion is set to “1”). Thereafter, in step P6, the dot ( Hereinafter, the contour dot is detected. Here, the boundary line is extracted by image processing using a Laplacian filter described below.

  In the image processing using the Laplacian filter, first, the values of four pixels B to E surrounding the target pixel A displayed by “0” or “1” are examined. When the relational expression satisfying F = (B + C + D + E) −4A is F <0, the portion represented by “1” indicates the boundary line on the object side. In the case of F> 0, the portion represented by “0” indicates the boundary line on the space side. When F = 0, it indicates that there is no boundary line. By this image processing, the outermost periphery of the product 1 and the outline of the through hole can be detected.

  Thereafter, in step P7, a boundary line (edge) existing immediately below the previously detected contour line is detected. This edge detection uses a screen position function. For example, as shown in FIG. 14, the screen position function detects a side edge of a product shape by drawing a line vertically downward from a plane on the product 1 (outermost circumference creation surface). If an edge is detected (YES), the process proceeds to step P8 to check whether this edge is detected for the first time. If this edge is detected for the first time (YES), the process proceeds to step P9, where the line constituting the edge in the product shape data D1 is an individual identifier indicating that it is a parting line candidate. (ID) is added. In Step 8, when the edge is detected for the second time (NO), the process proceeds to Step P12.

  Next, in step P10, the display 19 is changed, and in step P11, line elements of parting line candidates are recorded in the work memory 13. Thereafter, in step P12, it is checked whether there is a next parting line candidate further below. If there is a next parting line candidate (YES), the process returns to step P8. If there is no next parting line candidate (NO), the process proceeds to step P18.

  On the other hand, if there is no edge in step P7 (NO), the process proceeds to step P13, and the previously detected contour dot is projected onto the product shape.

  Next, in step P14, a curve is created on the surface of the product shape with the projected contour dots. Thereafter, in step P15, an individual identifier (ID) is added to the product shape data D1 as a parting line candidate.

  In step P16, the display 19 is changed. In step P17, the parting line candidates are stored in the work memory 13, and the process proceeds to step 18.

  In step P18, it is checked whether there is a next contour dot. If there is no outline dot (NO), the control is terminated. When there is a contour dot (YES), the process returns to Step P7 and Steps P8 to P12 or Steps P8 to P17 are repeated. In this way, it is possible to detect parting line candidates for all contour dots detected using the top view. Thereby, the outermost periphery of a product shape and the outline of a through-hole can be extracted as a boundary line of an edge or a surface pixel.

  In this way, in the injection mold designing method according to the first embodiment of the present invention, some parting line candidates are extracted in advance. Even when the product shape changes during the design due to the provision of a gradient, a parting line necessary for dividing the mold block into the core and the cavity at an arbitrary position can be automatically obtained.

  In the embodiment of the present invention, since the three-dimensionally displayed product shape is temporarily changed to a view seen from the mold opening direction, the parting line is detected by detecting the outermost peripheral edge of the top view. Easy to extract. The display 19 displays the outer edge of the product shape separately from other parts, or displays the color separately from the outer edge of the product shape as a boundary. It is possible to easily discriminate between a part that requires work and a part that does not require design work.

(2) Second Embodiment FIG. 15 shows a flowchart of detection of a draft surface according to a second embodiment of the present invention. In this process, the draft surface provision unit 42 detects a surface that needs draft provision from the product shape.

  First, in step P1, the product shape data D1 is read from the design data memory 11, and the surface element of the product shape is read in step P2. This surface element corresponds to the bottom surface, side surface, and rising surface of the product 1.

  Next, the designer determines the type of the surface element in step P3. Here, if the surface to be inspected is a plane, the process proceeds to step P4, the center of gravity of the plane is calculated, and then the process proceeds to step P7.

  If the surface to be inspected is a free-form surface, the process proceeds to step P5, and the designer inputs the number of grids or the grid pitch for dividing the surface from the keyboard 17. The number of grids or grid pitch may be set in the apparatus in advance.

  Thereafter, the CPU 18 calculates the coordinates of the grid intersection in step P6, and proceeds to step P7.

  In step P7, a solid identifier (ID) indicating an inspection point is added to the barycentric point calculated in step P4 or the grid intersection calculated in step P6. Thereafter, in step P8, a unit normal vector at the inspection point is calculated. The unit normal vector k calculated here is set as the inspection vector. Then, in step P9, the draft surface adding unit 42 adds ID = k to the inspection point.

  Thereafter, in step P10, the mold opening direction component of the inspection vector k is examined. When the inspection vector k is 0 (that is, in the case of a surface parallel to the mold opening direction), the process proceeds to step P11, and this surface is set as a gradient applying surface, and the product shape data D1 indicates that it is a gradient applying surface. An individual identifier (ID) is added. In step P12, the color of the gradient imparting surface is changed from the other surface and displayed on the display 19.

  Thereafter, in step P13, a warning is given by sound or display that the gradient imparting surface has been detected. When the inspection vector k is not 0 in step P10 (k ≠ 0: that is, a surface oblique to the mold opening direction), it is determined that the additional gradient is unnecessary, and the process proceeds to step P14. To do.

  In step P14, it is checked whether there is an inspection point to be inspected next. If there is a next inspection point (YES), the process returns to step P7 to check whether a draft is necessary. If there is no next inspection point in step P14 (NO), the process proceeds to step P20.

  When the surface to be inspected in step P3 is a cylindrical surface, a unit vector k of the central axis of the cylindrical surface is calculated. The unit vector is set as an inspection vector k.

  Thereafter, in step P16, the mold opening direction component of the inspection vector k is examined. When the inspection vector k is 1 (that is, when the central axis of the cylindrical surface is parallel to the mold opening direction), the process proceeds to Step P17, and the data of the cylindrical surface in the product shape data D1 is a gradient imparting surface. An individual identifier (ID) indicating this is added. In step P18, the gradient imparting surface is displayed on the display 19 in a color different from that of the other surfaces.

  Thereafter, in step P19, the fact that the gradient imparting surface has been detected is notified by sound or display. When the inspection vector k is not 1 in step P14 (k ≠ 1: That is, when the central axis of the cylindrical surface is perpendicular to the mold opening direction), it is determined that no draft is necessary, and the step Move to P20.

  In Step P20, it is checked whether there is a surface to be inspected next. If there is a surface to be inspected next (YES), the process returns to step P2 and steps P2 to P14 are repeated. If there is no surface to be inspected (NO), the control is terminated.

  As a result, the gradient imparting surface can be detected when the rising portion of the product shape is a flat surface, a free-form surface, or a cylindrical surface. Here, the detected gradient imparting surface is stored in the work memory 13 as element data D3.

(3) Third Embodiment FIG. 16 shows a flowchart for assigning draft priority according to a third embodiment of the present invention. In this process, the draft imparting section 42 gives priority to the slope imparting surface detected in the second embodiment.

  In FIG. 16, first, in step P1, the previously registered information on the gradient imparting surface is read from the work memory 13, and in step P2, the enlargement center of the draft surface is calculated. The center of enlargement is the center of gravity when the product shape is projected onto a plane perpendicular to the mold opening direction.

  Next, in step P3, an inspection vector k before enlargement is calculated. Thereafter, in step P4, the product shape is enlarged in the direction perpendicular to the mold opening direction Z on the display 19. FIG. 17 shows isometric views before and after expansion of the product shape. Next, in step P5, an inspection vector after enlargement is calculated.

  In step P6, a contraction vector of the gradient imparting surface is calculated. Here, FIG. 18A shows a cross-sectional view of the edge of the product 1 before and after expansion. In FIG. 18A, (a) and (b) show sample points of the edge before and after the enlargement of the product 1. FIG. 18B shows a vector analysis diagram of point (a). S (the vector symbol is omitted) is a contraction vector, which is a component that works so that the product tightens the core. P (the vector symbol is omitted) is a normal vector of the edge surface. Ps (a vector symbol is omitted) is a normal vector of the edge surface in the contraction direction of the product 1 (hereinafter referred to as a normal vector in the contraction direction). When the shrinkage vector S and the normal vector Ps in the shrinking direction are opposite to each other (that is, in the case of the outer surface), the molded product can be easily removed from the mold. (However, it is preferable to add a draft).

  FIG. 18C shows a vector analysis diagram of point (b). When the shrinkage vector S and the normal vector Ps in the shrinking direction are in the same direction (that is, in the case of the inner surface), the molded product cannot be easily removed from the mold. Indicates that it must be attached.

  That is, in step P7, the enlarged center direction component of the sample points (a) and (b) is detected from the enlarged view of the draft plane as shown in FIG. In step P8, vector analysis is performed on the sample points (a) and (b). Here, when the normal vector Ps in the contraction direction and the contraction vector S are opposite (NO), the process proceeds to step P11 and the necessity of the draft is recorded. Thereafter, in step P12, a warning is displayed on the display 19 indicating that it is preferable to provide a gradient although it is not essential to provide a draft.

  If the direction of the normal vector Ps in the contraction direction coincides with the contraction vector S in step P8 (YES), the process proceeds to step P9 to record that the draft is essential. Thereafter, in step P12, the display 19 displays a warning that it is essential to provide a draft angle.

  Thereby, based on the normal vector Ps of the shrinkage direction and the shrinkage vector S, the constituent surfaces of the product 1 can be classified into a surface in which a draft is essential and a surface in which a draft is preferably given. .

In this way, in the mold designing method according to the third embodiment of the present invention, by comparing the direction of the normal vector Ps of the gradient surface of the product shape with the direction of the contraction vector S, in step P9. Since priority is given as “surface where the mold gradient surface is essential” and “surface where it is preferable to provide the gradient surface” in Step P11, it is appropriately given to the place where the draft is necessary. It can be confirmed whether or not.
(4) Fourth Embodiment FIG. 19 shows a draft adding flowchart according to a fourth embodiment of the present invention. In this process, the draft angle imparting unit 42 gives an inclination to the draft surface. As a method of providing the inclination, a method of simply inclining the gradient applying surface, a method of using a conical inclined surface, a base end side edge of the rising surface is horizontally shifted by a certain distance, and the shifted edge and the rising surface are There is a method of creating a ruled surface that connects the leading edge of the two.

  In FIG. 19, first, in step P <b> 1, the element data D <b> 3 of the product shape edge recorded previously is read from the work memory 13.

  Next, the designer selects a surface to which a draft is given in Step P2. If the selected surface is a flat surface, the process proceeds to step P3, and an edge cross-sectional view of the product 1 is temporarily displayed on the display 19 as shown in the broken circle in FIG. In the broken line circle diagram of FIG. 20, a guide curve (reference line) is displayed on the display 19 along the edge of the product shape. In FIG. 20, the designer sets a reference point at an arbitrary position on the line of the edge of the product shape, and extends the reference point from the reference point in the X or Y direction of the product shape. Thereby, a guide curve (straight line) is obtained.

  Thereafter, in steps P4 and P5, the designer inputs an angle and a rotation direction from the keyboard. If it does so, it will transfer to step P6, and as shown in FIG. 20, a new surface will be produced by rotating the edge surface of a product shape by the input angle in the input rotation direction centering on a guide curve. Thereby, a gradient surface is obtained.

  Then, as shown in FIG. 21, a new edge is selected and projected onto the product shape. In FIG. 21, 1E is the original edge portion, and 1F shows the edge portion after offset projected onto the product 1. Note that an isometric view of the product shape with a draft as shown in FIG. 22 is displayed on the display 19. Thereafter, the process proceeds to step P17.

  In step P2, when the rising portion of the product shape is a free-form surface, the process proceeds to step P7 to create a ruled surface, and a guide curve (reference line) is created. At this time, the edge cross section is temporarily displayed on the display 19 in a plan view. The edge cross section is the rising portion of the product 1. This plan view intersects perpendicularly to the guide curve.

  Thereafter, in step P8, an edge is projected on the plan view on the display 19. Then, the designer inputs the offset amount of the base side edge of the rising surface in Step P9. The design apparatus projects the offset edge onto the product shape in step P10.

  Next, in Step P11, a triangle having the offset edge, the edge before being offset, and the leading edge of the rising surface as a vertex is created, and this triangle is moved along the guide curve to Find the locus of the hypotenuse and obtain the ruled surface. Thereafter, the process proceeds to step P17.

  Further, if it is selected in step P2 to create a ruled surface using a cone, the process moves to step P12 to create a reference (guide) line in order to create a ruled surface. In steps P13 and P14, the designer inputs the cone angle and the intersection calculation pitch. Then, in step P15, the design apparatus moves the cone along the reference line, and calculates an intersection line between the locus of the hypotenuse of the cone or the extension line of the hypotenuse and the bottom surface for each intersection calculation pitch.

  Thereafter, the process proceeds to step P16, and the design apparatus creates a ruled surface connecting the calculated intersection line and the leading edge of the rising surface. Thereafter, the process proceeds to step P17. The method of creating a ruled surface using this cone can be applied even when the bottom surface is not flat. The intersecting line is also used for further shape correction in a later process.

  In step P17, the ruled surface connection portion is processed. That is, the intersecting line of the ruled surfaces in a portion where a plurality of surfaces are connected is calculated, and the portion where the ruled surfaces overlap is trimmed. In this way, the product shape can be inclined (draft angle) regardless of whether the rising portion of the product shape is a flat surface, a free-form surface, or a bottom surface that is not flat. Here, the draft information of the assigned product shape is stored in the work memory 13.

  In this way, in the mold designing method according to the fourth embodiment of the present invention, in step P2, a newly designated reference point is projected onto the rising portion of the product shape on the temporarily created plane, A guide curve is generated by extending a new reference point, and a slope is created by tilting the surface or moving the cone along this guide curve, so a draft is added to the rising surface of the product shape. it can.

  For this reason, even when the gradient surface changes due to the shrinkage correction of the product shape, the gradient can be freely changed by redesignating the angle of the hypotenuse of the cone. Therefore, a slope surface suitable for the product shape can be provided. The optimum slope surface allows the product 1 to be easily pulled out of the mold.

  In the conventional three-dimensional CAD, the only function is to give a gradient to a plane or cylindrical surface. However, in the embodiment of the present invention, even if the surface to which the gradient is applied is a curve, steps P7 to P11 or As shown in P12 to P14, the product 1 can be provided with an optimum slope surface. For this reason, in the present embodiment, even when the gradient surface of the free-form surface is changed by the correction of the contraction rate of the product 1, by newly specifying the ridge line on the temporarily created plane, the gradient The surface can be changed freely. Therefore, even if the shape of the product 1 is changed, an optimal gradient surface can be provided.

(5) Fifth Embodiment FIG. 23 shows a parting line creation flowchart according to the fifth embodiment of the present invention. In this process, the parting line creation unit 41 creates a main parting line for dividing the mold into a cavity and a core. In the embodiment of the present invention, Steps P1 to P3 and Steps P11 to P14 overlap with other embodiments.

  In FIG. 23, first, in step P1, a parting line candidate is extracted as shown in FIG. 13, and an ID is added to the parting line candidate in step P2. Thereafter, the process proceeds to step P3, and a draft is given by the method shown in FIG.

  Next, in step P4, the guide curve (reference line) used for giving the draft is also added as a parting line candidate. This is because it is necessary for changing the shape of the product 1 or the like.

  In step P5, the parting line candidates are read from the work memory 13. Next, the designer determines whether or not to use the parting line candidate read out in step P6 as the main parting line. Here, when used as the main parting line (YES), the process proceeds to step P7, and the line element is registered in the work memory 13 as the main parting line.

  At this time, when the product shape is cylindrical as shown in FIG. 24A and the edge cannot be specified, or when it is desired to provide a parting line at a place other than the edge, first, the parting line Define a plane (curved surface) perpendicular to the normal of the surface you want to create. Then, a curve (or straight line) is created on this plane. The design apparatus projects this curve (straight line) onto a cylindrical product shape. Then, a parting line can be created in the cylindrical product shape 1 as shown in FIG.

  After setting the main parting line in this way and recording the line elements, the designer displays the product shape (bottom view) viewed from the mold opening direction on the display 19, as shown in FIG. Specify the outer edge. Then, the display 19 changes the color tone of the designated outer peripheral edge part, changes the line type on the inner side and the outer side with the outer peripheral edge as a boundary, and changes the silhouette on the inner side and the outer side of the parting line (marking process). )

  Thereafter, the process proceeds to step P8, and an ID indicating that the line element is used as a main parting line is added. Thereafter, in step P9, the display (marking process) on the display 19 is changed so that it can be distinguished from other lines, and the process proceeds to step P10.

  If it is determined in step P6 that the designer does not use the main parting line (NO), it is searched in step P10 whether there is a next candidate. If there is a next candidate (YES), the process returns to step P5 and steps P5 to P10 are repeated. When there is no next candidate (NO), the process proceeds to Step P11 and a loop check is performed to determine whether or not the main parting line becomes a closed loop.

  If the main parting line does not become a closed loop (YES), the process proceeds to step P12 to correct the main parting line. This correction is performed by the designer instructing an edge curve, a boundary line or the like while looking at the display 19.

  Thereafter, the process proceeds to step P13, and an ID is added to the edited parting line. Next, in step P14, the display 19 changes the display and returns to step P11.

  If there is no open element (NO), the setting of the main parting line is terminated. The set main parting line element data D3 is stored in the work memory 13. Thereby, the main parting line which divides | segments a metal mold | die into a cavity and a core can be created.

  In this way, in the mold designing method according to the fifth embodiment of the present invention, as shown in step P7, the projection plane is projected onto a plane perpendicular to the normal direction of the curved surface of the cylindrical portion. Is created, and a straight line is created on this surface, and this straight line is projected onto the curved surface of the product.This is useful when you cannot specify an edge on the curved surface or when you want to provide a parting line at a location other than the edge. is there. When the main parting line is intentionally raised from the product surface in the mold opening direction, the parting line is created from the top view of the product and projected onto the side view of the product. The line can be designed freely.

(6) Sixth Embodiment FIG. 26 shows a parting line check flowchart according to the sixth embodiment of the present invention. In this process, the parting line creation unit 41 automatically checks whether the main parting line is in a closed loop. If OK, set as parting line.

  In FIG. 26, first, in step P1, the parting line element data is read from the work memory 13, and in step P2, the parting line loop check is started. Here, the designer indicates the element of the parting line. The parting line element is represented by epL (n) as shown in FIG.

Next, for the parting line element designated by the designer, a loop number is added to the parting line in step P3, and then the starting node coordinates are calculated in step P4. Here, the parting lines to which the loop numbers are added are grouped as one element. The starting point coordinates of the parting line are displayed as (xn ^S , yn ^S , zn ^S ), and the end point coordinates are displayed as (xn ^E , yn ^E , zn ^E ).

  Next, in step P5, an element epL (n) of another parting line connected to the target parting line is searched. Thereafter, in step P6, it is determined whether there is a parting line element having a node of the same coordinate. This determination is made based on whether the start point of the element epL (n) and the end point of the element epL (n−1) match, or the end point of the element epL (n) and the start point of the element epL (n + 1) match. It is something to detect.

  If it is determined that there is a parting line having a node with the same coordinates (YES), the process proceeds to step P7 to determine whether it is the starting node of the parting line. If it is determined that the node is the start node (YES), the process proceeds to step P8 to determine whether there is a next loop number. If there is a next loop number (YES), the process proceeds to step P9 to read the parting line element data D3 having the next loop number.

  Thereafter, the process returns to step P4 to calculate the start node coordinates. If it is determined in step P6 that there is no parting line having a node with the same coordinates (NO), a parting line connected to another parting line is displayed in step P10.

  Next, in Step P11, it is determined whether or not there are a plurality of elements connected to other parting lines. If it is determined that there are a plurality of elements (YES), the process proceeds to step P12 to check other parting lines. At this time, the designer instructs the parting line to be checked. Then, for the parting line instructed by the designer, in step P13, it is determined whether or not the loop number of the instructed parting line is an existing one. If it is determined that the loop number is an existing one (YES), the process proceeds to step P15. If it is determined that the loop number is not an existing one (NO), the process proceeds to step P14, and the loop number is assigned to the parting line that has not been selected. Then, the process proceeds to step P15, and the coordinate value of the next node is calculated.

  Thereafter, the process returns to Step P5, and the parting line element connected to the other parting line is searched. In step P6, it is determined whether there is a parting line element having a node of the same coordinate. Here, if there is no parting line element having a node of the same coordinate, that is, if it is determined that the parting line is not in a closed loop (NO), the process proceeds to step P16 and an error occurs in the display 19. Is displayed, and the process proceeds to Step P17 and ends abnormally.

  If it is determined in step P8 that there is no next loop number (NO), the process proceeds to step P18 to check whether there is an unchecked parting line element. If there is an unchecked parting line (YES), the process returns to Step P3, and Steps P3 to P15 are repeated. If there is no unchecked parting line (NO), all the grouped parting lines are closed loop, and the control is terminated. This completes the parting line check.

  As described above, in the mold designing method according to the sixth embodiment of the present invention, whether there is a parting line element having a node of the same coordinate in step P6 according to the coordinate search result of the line element of the parting line. By checking whether or not the parting line forms a closed loop, it is possible to automatically check whether or not the parting line forms a closed loop. "If the parting line does not form a closed loop," it can be understood at the initial stage of design that "the mold block 100 cannot be divided into the core and the cavity." In addition, the check function can also check for overlap of parting line elements.

  In the present embodiment, the line elements of the parting line can be grouped by adding a loop number to the line element of the parting line in step P3. For this reason, data processing can be performed collectively when creating a split surface for dividing the mold block 100 into a core and a cavity, or when adding an individual identifier (ID) such as a priority order.

(7) Seventh Embodiment FIG. 28 shows a detection flowchart of an undercut portion of a product shape according to a seventh embodiment of the present invention. In this processing, the parting line creation unit 41 detects a parting line at a part that becomes an opening (hole) of the product 1. In the mold, the undercut part is nested. In the nesting, it is necessary to slide the divided parts and punch the molded product.

  In FIG. 28, first, in step P1, the product shape data D1 for which the main parting line is determined is read from the work memory 13, and in step P2, the direction of the search vector for searching for the undercut is set.

  As shown in FIG. 29, this search vector is a -Z component, which is opposite to the vector in the mold opening direction. The direction of mold opening is a direction in which the mold block 100 is divided into a core and a cavity (see FIG. 8). Accordingly, a surface element having a normal vector in the same direction as the search vector is an obstacle when the mold block 100 is divided into a core and a cavity.

  Next, in step P3, surface elements constituting the product shape are read, and in step P4, the direction component of the normal vector of the product surface with respect to the search vector is examined. Here, as shown in FIG. 29, when the normal vector is opposite to the direction component of the search vector and is positive (+) or 0, there is no obstacle at the time of mold opening. To find the next face element. Note that the direction component of the search vector as shown in FIG. 30 is 0, and the hole opened in the upper surface of the product 1 is not an undercut portion. This part is a parting line that is simply nested in the mold. Such an opening is displayed on the display 19 with a different color tone in order to distinguish it from the undercut portion.

  If the normal vector has the same direction component as the search vector and is negative (-), as shown in FIG. 29, there is an undercut part that becomes an obstacle when the mold is opened. For example, the designer inputs the number of grids that divide the surface. Then, CPU18 calculates the grid intersection containing the parting of the surface used as an undercut part by step P6.

  In step P7, a straight line (semi-infinite straight line) extending in the (−) direction of the search vector starting from the grid intersection is created. Thereafter, in step P8, it is detected whether or not there is a product surface that intersects the semi-infinite straight line. If there is a product surface that intersects a semi-infinite straight line (YES), the process proceeds to step P9 and is registered as an undercut part. Then, an undercut ID is added to the product shape data D1.

  If a surface that intersects a semi-infinite straight line is not detected in step 8 (NO), the undercut portion is not used, and the process proceeds to step P10 to check whether there is a surface element to be inspected next. If there is a surface element to be inspected next (YES), the process returns to Step P3 to read out the surface element constituting the product shape. Then, Steps P3 to P9 are repeated. In step P10, if there is no surface element to be inspected next (NO), the control is terminated. Thereby, the undercut part of the product 1 can be detected.

  Thus, in the mold design method according to the seventh embodiment of the present invention, the mold cavity 3 is removed from the core 4 by searching the normal vector of the product shape in the same direction as the search vector. It is possible to detect an undercut portion that hinders extraction. For this reason, it is not possible to overlook undercuts hidden behind shadows such as rising parts of product shapes and bosses. Further, by detecting the undercut, the mold core can be designed in a nested structure.

  In the embodiment of the present invention, when there is a closed loop of another parting line inside a closed loop of a certain parting line, a closed loop candidate of the inner parting line is provided in the product 1. Since the holes other than the undercut portion are shown, the mold can be designed without missing a hole hidden in the shadow of the rising part of the product shape or the boss.

(8) Eighth Embodiment FIGS. 31 and 32 show flowcharts for checking the releasability of the draft surface according to the eighth embodiment of the present invention. In this process, the draft surface imparting section 42 checks whether or not the molded product is skillfully removed from the mold.

  In FIG. 31, first, in step P1, the product shape data D1 is read from the design data memory 11, and the product shape surface element is read from the work memory 13 in step P2. Here, the designer instructs the surface element of the parting line. The surface element is selected from three planes, a free-form surface and a conical surface.

  Then, the surface elements obtained in FIG. 3 are classified in step P3. If the surface element is a plane, the inspection point is read out in step P4.

  Next, in step P5, the contraction vector is read out, and then the area is calculated in step P6. In step P7, the contraction force at the time of punching the molded product is calculated by multiplying the size and area of the contraction vector.

  If the surface is a free-form surface in step P3, the inspection point is read in step P8, and the contraction vector is read in step P9. Thereafter, in step P10, the area is calculated. In step P11, the contraction force is calculated by multiplying the size of the contraction vector and the area in the same manner as in the case where the surface element is a plane.

  Next, in step P12, it is checked whether or not there is a next inspection point. If it is determined that there is a next inspection point (YES), the process returns to step P8 to read the inspection point. If it is determined in step P12 that there are no inspection points (NO), the process proceeds to step P13, and all the contraction forces of the product 1 are added. Then, the process proceeds to step P18.

  In the case of a conical surface in step P3, the contraction vector is read out in step P14, and then the area is calculated in step P15. Then, the process proceeds to step P16, and the contraction force is calculated by multiplying the size and area of the contraction vector. Thereafter, the process proceeds to step P17, and all the contractile forces are added. Then, the process proceeds to step P18.

  In Step P18, it is determined whether there is a next surface element. If there is a next surface element (YES), the process returns to step P2 and steps P3 to P18 are repeated. If there is no next surface element in step P18 (NO), the process proceeds to step P19, where the overall contraction force is multiplied by a coefficient to calculate the adhesion force of the molded product to the mold.

  Thereafter, in step P20, the ejecting force of the ejector pin and the adhesive force of the molded product are compared. Here, when the ejecting force of the ejector pin is equal to or less than the adhesion force of the molded product (NO), the process returns to the draft step of the main routine of FIG.

  Further, when the ejecting force of the ejector pin exceeds the adhesive force of the molded product at step P20 (YES), the process proceeds to step P22 to calculate the total contraction force of the core surface. Thereafter, the total shrinkage force of the cavity surface is calculated in step P23.

  Next, in step P24, the total shrinkage force on the core surface and the total shrinkage force on the cavity surface are compared. Here, when the total contraction force of the core surface is larger than the total contraction force of the cavity surface (YES), the control is terminated. If the total contraction force of the core surface is smaller than the total contraction force of the cavity surface, the process returns to the draft addition step P4 of the main routine of FIG. 5 in order to apply the draft again.

  Thereby, it can be checked whether or not the molded product can be skillfully removed from the mold (releasability of the draft surface).

(9) Ninth Embodiment FIGS. 33 to 35 show parting surface creation flowcharts according to the ninth embodiment of the present invention. In this process, the mold dividing unit 52 creates a mold block 100 that three-dimensionally surrounds the product shape, and creates a hollow portion corresponding to the product shape in the mold block. Thereafter, a parting surface 200 is created based on the parting line candidates, and the mold block 100 is divided based on the parting surface 200, thereby creating a cavity and a core.

  In FIG. 33, first, in step P1, cavity core data D4 obtained by inverting the actual product shape and the space shape surrounding it is read from the work memory 13, and in step P2, the parting line element data D3 is read from the memory 13. Read from.

  Next, in step P3, the designer classifies the mold block 100. For example, if the mold block 100 is a rectangular parallelepiped as shown in FIG. 36, in response to the designer's instruction, in step P4, the Z axis is the mold opening direction, the X axis is the long side, and the Y axis is the short side. Define the coordinate system as

  Next, at step P5, it is detected whether there is a parting line that intersects the surface of the element X = 0 of the mold block 100. Here, the surface of the element X = 0 refers to the surface of the mold block 100 in the ZY direction. If a parting line that intersects the surface of element X = 0 is detected in step P5 (YES), the parting line is divided at a point that intersects the surface of element X = 0 in step P6. Thereafter, the process proceeds to step P7. If the parting line that intersects the surface of the element X = 0 cannot be detected (NO), the process proceeds to step P7, and the mold dividing unit 52 determines the position of the element epL (n) of the parting line. To detect.

  If the element X> 0 of the mold block 100 is detected (YES), a parting line is projected on the surface in the + X direction of the mold block 100 in step P8. If X <0 is detected in step P7 (NO), the mold dividing unit 52 projects a parting line on the surface in the −X direction of the mold block 100 in step P9.

  Further, at step P10, it is detected whether or not there is a parting line that intersects the surface of the element Y = 0 of the mold block 100. Here, the element Y = 0 means the surface of the mold block 100 in the ZX direction. When a parting line that intersects the surface of element Y = 0 is detected (YES), the parting line is divided at a point that intersects the surface of element Y = 0 in step P11. Thereafter, the process proceeds to step P12.

  If a parting line that intersects the surface of the element Y = 0 of the mold block 100 cannot be detected (NO), the process proceeds to step P12 to detect the position of the element epL (n) of the parting line. Here, if Y> 0 (YES), a parting line is projected onto the surface in the + Y direction of the mold block 100 in step P13. If Y <0 in step P12 (NO), a parting line is projected on the surface in the -Y direction of the mold block 100 in step P14.

  Thereafter, in step P15, a ruled surface is created between the curve projected on the mold block 100 and the parting line given to the product shape. Then, the curve projected on the mold block 100 in step P16 is connected to the parting line given to the product shape. Thereby, four parting surfaces 200 can be created in the X and Y directions.

  In step P17, a parting surface 200 as shown in FIG. In this figure, the parting lines given to the product shape are projected on the four side surfaces of the mold block 100. FIG. FIG. 38 is an enlarged view of the parting line projected on the four side surfaces of the mold block 100 by calculating an offset. That is, the coordinates of the edge of the projected parting line are extended to the corner of the mold block. Alternatively, a specific point on a plane including two parting lines may be used as an enlargement center, and an edge part of a product shape may be enlarged and projected onto a mold block to create a parting line at the edge part of the mold block. In this way, a parting surface 200 that divides the mold block 100 into the cavity 3 and the core 4 can be formed. In FIG. 38, a single arrow line is a parting line given to the product shape. A curved line projected by the double arrow line on the mold block 100 is an enlarged parting line.

  When the designer designates a cylindrical shape as the shape of the mold block 100 in step P3, the coordinate system is defined in step P18 with the Z axis as the mold opening direction, the X axis as arbitrary, and the Y axis as arbitrary.

  Next, in step P19, a similar enlargement direction vector of the elements of the parting line is calculated. The similar enlargement direction vector is a line segment from the origin of the parting line to be arbitrarily enlarged to the definition point of the parting line.

  Thereafter, the process proceeds to step P20, and the Z-axis component of the similar enlargement direction vector is set to k = 0. In step P21, the parting line element is enlarged in parallel with the XY plane, and the parting line is projected onto the surface of the mold block 100. Here, the previously corrected vector is used. Thereafter, in step P22, the mold dividing unit 52 creates a ruled surface between the curve projected on the surface of the mold block 100 and the parting line given to the product shape 1.

  In step P3, if the mold block 100 is neither a rectangular parallelepiped nor a cylinder, in other cases, in step P23, the Z axis is the mold opening direction, the X axis is arbitrary, and the Y axis is arbitrary. Define a coordinate system. In step P24, the designer instructs the mold dividing unit 52 on the projection target surface.

  Thereafter, the process proceeds to step P25, and a projection direction vector is input. In step P26, the direction of the projection direction vector is set as the X ′ axis. Thereafter, it is detected whether there is a parting line intersecting the X ′ = 0 plane of the element of the mold block 100.

  If there is a parting line that intersects the surface of the element X ′ = 0 (YES), the parting line is divided at a point that intersects the surface of the element X ′ = 0. Thereafter, the process proceeds to step P29. If there is no parting line intersecting the surface of the element X ′ = 0 (NO), the process proceeds to step P29, and the position of the line element of the parting line is detected. Here, if X ′> 0 (YES), a parting line is projected onto the surface in the + X ′ direction of the mold block 100 in step P30. If X ′ <0 in step P29 (NO), the process proceeds to step P30.

  Thereafter, in step P31, a ruled surface is created between the curve projected on the mold block 100 and the parting line given to the product shape.

  In step P32, it is detected whether there is a next projection direction. If the next projection direction is detected (YES), the process returns to step P24 and steps P24 to P32 are repeated. If the next projection direction cannot be detected (NO), the control ends.

  Thereby, the parting surface 200 for dividing the mold block 100 into the cavity 3 and the core 4 can be formed. The cavity core division information is stored in the work memory 13 as cavity core data D4. The cavity constitutes the fixed side of the mold, and the core constitutes the movable side of the mold. The cavity core is registered as a separate part.

  In this way, in the mold designing method according to the ninth embodiment of the present invention, the parting line 200 for partitioning the mold block 100 in the mold dividing section 52 is extended in parallel to the specified direction, so that the parting surface 200 Therefore, the position coordinates of the parting line can be used as the starting point coordinates of the parting surface 200. Therefore, since it is only necessary to specify the position where the parting line is extended, the burden on the designer is greatly reduced as compared to the case where all new coordinates are input as the parting surface 200. In addition, the design man-hour is significantly shortened.

  In the embodiment of the present invention, an arbitrary offset amount is given to the parting line that divides the mold block 100, and the parting line 200 is expanded in a specified direction, so that the parting surface 200 is created. For example, by simply designating the position where the parting surface 200 is desired to be enlarged, it is possible to clearly understand, for example, in what plane the core block and the cavity can be divided in the three-dimensionally displayed mold block 100.

  In the embodiment of the present invention, the parting surface 200 that divides the core and cavity of the mold block 100 is three-dimensionally displayed in a perspective view, so that the state of the convex part of the mold block 100 that is the core of the mold It can be confirmed from the concave side of the mold block 100 that becomes the cavity. Thus, the parting surface 200 passing through the parting line can be efficiently created.

(10) Tenth Embodiment FIGS. 39 to 41 show flowcharts for detecting the depth and division candidate position of a mold according to a tenth embodiment of the present invention. In this processing, the cavity 3 and the core 4 are nested in accordance with the depth of the mold in order to facilitate the manufacture of the cavity 3 and the core 4 in the nested dividing portion 502. In order to create a nesting, it is necessary to detect a nesting division candidate according to the depth of the mold.

  In FIG. 39, first, in step P1, the cavity core data D4 is read from the work memory 13, and in step P2, a plane is arranged at a position to check the depth of the mold. Next, in step P3, a cross section of the mold is displayed on the display 19 to check the depth. Here, the neutral surface of the mold as shown in FIG. 42 is displayed on the display 19. The neutral surface means a surface formed by gathering the thickness center points of the molded product, but the concave portion includes a surface separated by a certain distance from the wall surface as shown by a one-dot chain line in FIG. . In FIG. 42, reference numeral 100A denotes a hollow portion that becomes a molded product. Reference numeral 100B denotes a parting line candidate portion. 100C is the deepest part of the mold. 100D is a portion where the Z component in the neutral plane changes abruptly (abrupt irregularities).

 100E is a portion where the neutral surface branches and corresponds to a rib or the like of the molded product.

  Thereafter, in step P4, the cavity 3 part (cavity part) is searched (decreased) to detect the thickness center line. The wall thickness center line is a line passing through the center in the thickness direction of the edge of the resin of the molded product.

  In step P5, a reference line for measuring the depth of the mold is defined. In step P6, an upper limit value that is a depth detection range is input in accordance with an instruction from the designer.

  Thereafter, in step P7, pixels on the thickness center line are read out, and in step P8, a straight line passing through the pixels on the thickness center line and parallel to the mold opening direction is created. In step P9, the intersection of the previous straight line and the reference line is calculated.

  Next, in step P10, the distance from the pixel on the thickness center line to the intersection is calculated. Here, how many mm per pixel is calculated.

  Then, the process proceeds to step P11, and the previously calculated distance is compared with the upper limit value of the depth. At this time, when the calculated distance is larger than the upper limit value of the depth (YES), the process proceeds to Step P12. If the calculated distance is equal to or less than the upper limit value of the depth (NO), the process proceeds to step P15.

  Next, in step P12, an edge near the pixel on the thickness center line is detected. Edge detection uses the screen position function. This function is as described above. Here, the deepest edge of the mold can be detected. A line element extending from this edge is a candidate for a nested dividing line.

  Thereafter, in step P13, a line extending from the deepest edge is registered as a candidate for the nested dividing line. For registration, a nesting parting line candidate ID and an algorithm are added to the cavity core data D4. The algorithm determines the order of nesting.

  Next, in step P14, the color tone is changed and displayed on the display 19 so that the isometric view of the mold as shown in FIG. 13 is easy to see. Thereafter, in step P15, it is checked whether or not there is a next pixel. If there is a next pixel (YES), the process returns to step P7, the pixel on the thickness center line is read, and the subsequent steps P8 to P14 are repeated. Thereby, the candidate of the division | segmentation division line of a metal mold | die is detectable.

Next, in step P16, the number of neighboring pixels whose depth is to be checked is input. As the number of pixels, an odd number of ² −1 is input with reference to a neighboring pixel whose depth is to be examined. For example, the number of pixels is 3 ² −1 = 8, 5 ² −1 = 24, or the like. The designer specifies the input pixel.

  Thereafter, in step P17, adjacent pixels are detected in the pixel matrix having the number of neighboring pixels specified by the designer. If adjacent pixels are detected (YES), the process proceeds to step P21. If a neighboring pixel cannot be detected (NO), the process proceeds to step P18 to detect an edge near the pixel. Edge detection uses the screen position function. Thereafter, in step P19, it is registered as a candidate for the nested dividing line. For registration, a nesting parting line candidate ID and an algorithm are added to the cavity core data D4. The algorithm determines the order of nesting.

  Next, in step P20, the color tone is changed and displayed on the display 19 so that the isometric view of the mold is easy to see. Thereafter, in step P21, it is checked whether or not there is a next pixel. If there is a next pixel (YES), the process returns to step P17 to read out the pixel on the thickness center line, and the subsequent steps P18 to P20 are repeated. As a result, the situation around the neighboring pixels can be understood at the candidate position where the mold is divided in the depth direction.

  Next, in step P22, an upper limit (absolute value) of the degree of inclination of the depth (change rate) is input. Thereafter, in step P23, the pixel at the candidate position for dividing the depth is read. Next, in step P24, the number of pixels n for approximately calculating the depth gradient is input. Thereafter, the process proceeds to step P25, and the left and right inclinations of the pixels read from the work memory 13 are calculated.

  Next, in step P26, the difference between the left and right inclinations of the pixel is compared with the upper limit value of the change rate of the inclination. Here, when the difference between the left and right inclinations is larger than the upper limit value of the change rate of the inclination (YES), the process proceeds to step P27 and an edge near the pixel is detected. Edge detection uses the screen position function. Thereafter, in step P28, it is registered as a candidate for a nested dividing line. This registration adds a nested dividing line candidate ID and an algorithm to the cavity core data D4. The algorithm determines the order of nesting.

  Next, in step P29, the color tone is changed and displayed on the display 19 so that the isometric view of the mold can be easily seen. Thereafter, the process proceeds to step P30. If the difference between the left and right inclinations is equal to or less than the upper limit value of the change rate of the depth inclination in step P26 (NO), the process proceeds to step P30 to check whether there is a next pixel. When there is a next pixel (YES), the process returns to Step P26, and the difference between the left and right inclinations of the pixel is compared with the upper limit value of the change rate of the inclination. Thereafter, steps P27 to P29 are repeated. On the other hand, if there is no next pixel in step P30 (NO), the control is terminated. Thereby, a nesting division candidate for creating a nesting according to the depth of the mold can be detected.

  In this way, in the mold designing method according to the tenth embodiment, the edge point near the deepest position from the dividing surface of the mold block 100 is extended in the dividing direction of the mold block 100 to thereby It is extracted as a candidate for a dividing boundary that divides the core into nested parts.

  For this reason, when the cross section of the product 1 viewed parallel to the dividing direction of the mold block 100 is interleaved with the comb shape, it is only necessary to create a nesting shape that is most easily processed as a mold part. This choice can be provided to the designer. Therefore, even when the mold cavity has a deep pocket shape that is difficult to process, the core 4 can be divided into optimal nesting.

(11) Eleventh Embodiment FIG. 43 shows a flowchart for assigning priorities of nested dividing line candidates according to the eleventh embodiment of the present invention. In this process, priority is given to the parting lines that divide the cavity 3 and the core 4 in the nested dividing section 502.

  In FIG. 43, first, in step P1, the cavity core data D4 in which the nesting parting line candidate is detected is read from the work memory 13. Then, a neutral surface of the mold as shown in FIG. 44 is displayed on the display 19.

  Next, in Step P2, candidate dividing lines are read for a portion where the unevenness of the mold becomes deep and a portion where the cavity of the mold becomes a narrow path. The dividing line candidate is obtained from the ID of the cavity core data D4 read from the work memory 13.

  Next, the process proceeds to step P3, and the division candidate lines are displayed on the neutral plane on the display 19 based on the division line candidates obtained from the ID of the cavity core data D4. The division candidate lines are indicated by broken lines in FIG. Then, a straight line passing through the division candidate line and parallel to the mold opening direction (Z) is created. This parallel straight line is indicated by a solid line in FIG.

  Thereafter, in step P4, the designer instructs a starting point for giving priority. Next, the process proceeds to step P5, and a straight line that passes through the start point and is perpendicular to the mold opening direction is created. After that, in Step P6, a point is formed that passes through the start point, passes through a straight line perpendicular to the mold opening direction, and a division candidate line (point in the cross section) and intersects with a straight line parallel to the mold opening direction.

  Next, in step P7, left and right intersection numbers are assigned in order from the direction closer to the start point. Here, R1 = (1), R2 = (2), R3 = (3)... On the right side, L1 = (1), L2 = (2), L3 = (3). In the drawing, these (1), (2), (3)... Are indicated by numbers with circles.

  Thereafter, in step P8, it is determined whether the intersection number is even or odd. If the intersection number is even (YES), the candidate line is registered as a candidate with high priority in step P9. And ID is added to the dividing line candidate of the cavity core data D4.

  Next, in step P10, the display 19 is changed from the neutral plane of the mold to the isometric view, and the color of the part that becomes the dividing line candidate is changed and displayed. Thereafter, the process proceeds to step P11. If the intersection number is an odd number (YES) in step P8, it is checked in step P11 whether there is a next intersection. If there is a next intersection (YES), the process returns to step P8 to check whether the intersection number is even or odd, and the subsequent steps P9 and P10 are repeated.

  If there is no next intersection in step P11 (NO), the control is terminated. Thereby, a priority can be given to the parting line which divides | segments the cavity 3 and the core 4. FIG.

  In this way, in the mold design method according to the eleventh embodiment, in step P9, the priority is given to the candidate for the dividing boundary line of the nested part according to the rule determined from the processing restrictions of the mold part. Therefore, when the cross section of the mold cavity is embedded in the comb shape, the designer can select a candidate for the boundary of the nesting part according to the priority, so that the shape can be easily processed as a mold part. You can create a nest. Therefore, the designer can easily design the nesting without experience.

(12) Twelfth Embodiment FIGS. 45 and 46 show flowcharts for arranging mold bases according to a twelfth embodiment of the present invention. In this process, in the mold base arrangement portion 61, a mold base for fixing the mold is arranged, or the mold is fixed by a plate.

  In FIG. 45, first, in step P1, the cavity core data D4 is read from the work memory 13, and in step P2, a mold base of an appropriate size in which the cavity core is accommodated is read. The mold base constitutes a plate for fixing the mold. In the embodiment of the present invention, the method of fixing the cavity core to the plate is patterned by screwing or collar, attachment position, screw nominal or collar dimension, and the like. Mold base data D <b> 2 obtained by patterning fixed parts is stored in the base file 12.

  Next, in step P3, the mold base placement unit 61 places the cavity core in the mold base. Thereafter, in step P4, the outer shape (mold block) of the cavity core is cut out from the plate of the mold base. In the hollowing out of the outer shape of the cavity core, real sky inversion is executed by the Boolean operation in the above-described mold dividing unit 52.

  Next, in step P5, the cavity core components are read out. In step P6, the designer designates a base part.

  Thereafter, in step P7, the designer selects a mold fixing structure. Here, when the mold is fixed by the pocket hole and screwing, the process proceeds to step P8, and the pocket depth is input. Here, a connection diagram of plates and blocks as shown in FIG. 47 is displayed on the display 19. In FIG. 47, 101 is a plate having pocket holes (counterbore holes) 102, and 201 is a block having screw holes 104. The plate 101 supports the block 201. Block 201 will maintain nesting. FIG. 47 shows a case where the plate 101 and the block 201 are fixed by screws 103.

  Then, the process proceeds to step P9, and a pocket hole 102 is created in the plate 101. The pocket hole 102 is created by cutting out halfway through the base plate 101. Thereafter, the process proceeds to step P11.

  In addition, when the designer selects the case where the die is fixed by the hollow hole and screwing in Step P7, the process proceeds to Step P10, and the hollow hole is created. The cut-out hole is created by cutting through the base part. Thereafter, the process proceeds to step P11, where the clearance (nominal) and depth of the fixing screw are input. In step P12, the number and position of fixing screws are input.

  Next, in step P13, a screw hole is created in the screw component to be fixed to the plate, and in step P14, a countersunk hole for the fixing screw is created. A counterbore hole is created in the plate located under the mold. Thereafter, the process proceeds to step P19.

  If the designer does not select a screwing method using pocket holes or punched holes in Step P7, the process proceeds to Step P15. For example, there is a case where the designer tries to fix the nesting as shown in FIG. In FIG. 48A, 201 is a block having pocket holes (bore holes) 203 and screw holes, and 202 is a nest having screw holes 205. FIG. 48 (A) shows a case where the insert 202 is fitted into the counterbore hole of the block 201 and fixed from the back surface with screws.

  In FIG. 48B, reference numeral 206 denotes a block having a stepped opening 207. 208 is a nesting with a collar 209. FIG. 48B shows a case where the insert 208 is inserted from the back surface of the block 206 and is fixed by another plate. The collar 209 of the nest 208 is caught by the stepped opening 207 and cannot be removed.

  Then, a hole for a part to be fixed to the plate 101 serving as a base is created. Thereafter, in step P16, the shape and dimensions of the nested collar are input.

  Next, in step P17, a collar is given to a component such as a nest. Then, in step P18, a brim gap is formed in the base component. Thereafter, the process proceeds to step P19 to check whether there is a next part. If there is a next part (YES), the process returns to Step P5, reads the mold base data D2 from the base file 12, and thereafter repeats Steps P6 and P18. If there is no next part in step P19 (NO), the control is terminated. This allows the mold to be placed on the mold base.

  In this way, in the mold designing method according to the twelfth embodiment, the designer selects one of the structures of the fixed parts such as pre-patterned screws or collars in Step P7, The fixed part can be designed by displaying the fixed part on the perspective view of the mold model and inputting the mounting position, screw designation, collar size, etc. via the keyboard 17. Therefore, the designer does not have to design the structure of the fixed part from the beginning. This greatly reduces the burden on the designer.

  In addition, as in the present embodiment, when screwing or collars are patterned as fixed parts, the number of input items is greatly reduced, and a mold part fixing structure can be designed in a short time. Also, at least knowledge about injection molding can be designed. Design work can be done efficiently.

(13) Thirteenth Embodiment FIG. 49 shows an image diagram on a display at the time of designing a gate according to a thirteenth embodiment of the present invention. FIG. 50 shows a gate design flowchart according to the thirteenth embodiment of the present invention. In this process, the gate design unit 62 designs a gate for injecting resin into the mold.

  In FIG. 49, the designer displays a mold part design menu screen on the display 19 and selects “gate design”. 50, first, the designer selects whether to design a two-plate structure mold or a three-plate structure mold in Step P1. In the two-plate mold, the runner stripper plate for introducing the resin into the cavity is omitted. A mold having a three-plate structure is composed of a runner stripper plate, a cavity plate, and a core plate.

  When a two-plate mold is selected (YES), the process proceeds to step P2 and a top view of a parting surface for dividing the mold is displayed on the display 19. Then, the process proceeds to step P3. In step P3, the designer selects the type (system / dimension) of the gate. When the designer selects the side gate (YES), the designer instructs the gate position in step P4. Here, an isometric view of the core 4 and the molded product 100 as shown in FIG. 51 is displayed on the display 19. In FIG. 51, reference numeral 301 denotes a gate, which is provided in the core 4. Thereafter, in step P5, the cross-sectional shape and dimensions of the gate are input, and in step P6, the locus of the gate is created. The direction in which the gate is formed is the Y direction as shown in FIG.

  When designing a side gate, as shown in FIG. 52A, the gate creation direction is defined by a combined vector in the X and Y directions. The default (the direction in which it cannot be placed) is the + X direction. Here, the length in the + direction and the length in the − direction are input with reference to the parting line. Whether the side gate is provided in the cavity 3 or the core 4 is selected by the menu screen of FIG.

  Next, in step P7, the designer indicates the groove to be carved into the mating surface of the cavity core. Then, a groove having a gate shape swept along the parting surface is obtained.

  When the designer selects the submarine gate in step P3 (NO), the process proceeds to step P8, and the designer instructs the gate position. Thereafter, the process proceeds to step P9, and the gate diameter and taper are input. In step P10, the gate tilt angle is input. Next, in step P11, the designer instructs a groove to be carved into the mating surface of the cavity 3 and the core 4. In the gate design unit 62, the groove is obtained toward the conical gate provided on the deepest surface.

  Furthermore, when the designer designs a mold having a three-plate structure in step P1 (YES), the designer moves to step P12 and instructs the gate position. The gate position is instructed by selecting a menu screen as shown in FIG. Thereafter, the gate diameter and taper are input in step P13.

  In step P14, the designer reads, for example, a pin gate (gate bush) having a shape closest to the gate shape from the base file 12. The gate bush is a standard part of the mold, and as shown in FIG. 52 (B), the bush hole creation position, counterbore diameter, counterbore depth, hole diameter, and hole depth are standardized.

  Thereafter, in step P15, the gate bush is arranged on the isometric view of the mold. Thereby, a side gate, a pin gate, etc. for injecting resin into a metal mold can be designed.

  In this way, in the mold designing method according to the thirteenth embodiment, the designer selects any one of the structures such as the side gate, submarine gate, or pin gate patterned in advance in Step P1 or P3. Thus, the selected gate can be displayed on the perspective view of the mold model, and the gate position, gate system and dimensions, connection processing, etc. can be designed through the keyboard 17 so that the designer can start the gate from the beginning. There is no need to design the structure. Thereby, there exists an effect that a designer's burden is reduced significantly. Further, in the present embodiment, since the parameters necessary for providing the gate are patterned, the operation is simplified. In other words, the patterning reduces the number of input items so that the gate can be designed in a short time.

(14) Fourteenth Embodiment FIG. 54 shows an image diagram on a display when a runner is designed according to a fourteenth embodiment of the present invention. FIG. 55 shows a runner design flowchart according to the fourteenth embodiment of the present invention. In this process, the liner designing unit 63 designs a runner for introducing the resin from the lateral direction of the mold.

  In FIG. 54, the designer displays a mold part design menu screen on the display 19 and selects “runner design”. 55, first, the designer selects whether to design a two-plate structure mold or a three-plate structure mold in Step P1. When the designer selects “design a mold having a two-plate structure” (YES), the process proceeds to Step P2, and the display 19 shows a top view of the cavity core mating surface (parting surface). indicate. Thereafter, the process proceeds to step P4.

  On the other hand, when the designer selects “Design a mold having a three-plate structure” in Step P2 (NO), a top view of the mating surfaces of the cavity plate and the runner stripper plate is displayed on the display 19. Then, it transfers to step P4 and creates a runner locus on the top view of the mold. The runner is formed in the Y direction following the gate 301 as shown in FIG. The runner trajectory is displayed as a straight line.

  Thereafter, the designer determines the cross-sectional shape of the runner in step P5. The runner trajectory is determined by the designer specifying the cavity core position on the menu screen. The runner trajectory is created using either a method of specifying and connecting a start point and an end point, or a method of inputting a start point and an increment value. The cross-sectional shape of the runner is specified by the designer on the menu screen.

  FIGS. 57A to 57D show the cross-sectional shape and dimensions of the runner. FIG. 57A shows a runner having a rectangular cross section. The width and height of the rectangular runner are defined with reference to the parting line PL. FIG. 57B shows a runner having a trapezoidal cross section. The trapezoidal runner has an upper base dimension, a lower base dimension, and a height defined with reference to the parting line PL. FIG. 57C shows a runner having a semicircular cross section. The semicircular runner has a defined diameter with reference to the parting line PL. FIG. 57D shows a runner having a circular cross section. The circular runner has a defined diameter with reference to the parting line PL.

  When the designer selects the case where the runner has a circular cross section, the process proceeds to step P6 and the radius of the circle is input. When the designer chooses to make the runner cross-section into an upper semicircular shape, the process proceeds to step P7 and the radius of the semicircle is input. When the designer selects the case where the cross section of the runner is an upper trapezoid, the process proceeds to step P8 and the runner design unit 63 inputs the trapezoidal dimensions. When the designer chooses the case where the cross section of the runner has a lower trapezoidal shape, the process proceeds to Step P9 and the runner design unit 63 inputs the trapezoidal dimensions. When the designer selects the case where the runner has a lower semicircular cross section, the process proceeds to step P10, where the runner design unit 63 inputs the radius of the semicircle.

  Thereafter, in step P11, the runner cross section is swept along the runner trajectory to create a three-dimensional shape of the runner.

  Next, in step P12, the runner design unit 63 adds a rotating body (1/2) having the same cross-sectional shape to the end of the runner. This rotating body means a cutting tool for connecting the runner and the gate. 1/2 indicates the rate at which the cutting tool hits the surface to be cut.

  In step P13, engraving is made according to the cross-sectional shape of the runner. In the case of a runner having a circular cross section, the process proceeds to step P14, and engraving is made on both sides of the mating surface of the cavity core. Engraving is obtained from the logical difference between the swept runner shapes. In the case of a runner having an upper semicircular shape and an upper trapezoidal cross section, the process proceeds to Step P15, and an engraving is made above the mating surface. Engraving is obtained from the logical difference between the swept runner shapes. In the case of a runner having a lower semicircular shape and a lower trapezoidal cross section, the process proceeds to Step P16, and engraving is made below the mating surface of the cavity core. Engraving is obtained from the logical difference between the swept runner shapes. Thereby, a runner for introducing the resin from the lateral direction of the mold can be designed.

  Thus, in the mold designing method according to the fourteenth embodiment, the designer selects either the pre-patterned two-plate or three-plate runner structure on the display 19. Display the selected runner on the perspective view of the mold model. The designer can design the runner by designating the runner cross-section, runner cross-sectional dimensions, trajectory, and connection portion processing and inputting numerical values via the keyboard 17, so the designer can design the runner from the beginning. No need to design. Thereby, there exists an effect that a designer's burden is reduced significantly.

  In the embodiment of the present invention, by patterning the runner cross section of 2 plates or 3 plates, runner cross section dimensions, trajectory, etc., the number of items input by the designer is greatly reduced, and the runner can be designed in a short time. Also, at least knowledge about injection molding can be designed.

(15) Fifteenth Embodiment FIG. 58 shows a design flowchart of the gas vent according to the fifteenth embodiment of the present invention. In this process, the gas vent design unit 65 designs a gas vent for extracting air from the cavity of the cavity core when the resin is pushed into the mold.

  58, first, in step P1, a top view of the parting surface 200 including the product shape as shown in FIG. 59 is displayed on the display 19. In FIG. 59, 303 is an ejector pin hole. The ejector pin hole 303 allows an unillustrated ejector pin to pass when the molded product 1 is punched.

  Next, in step P2, the final filling position information of the resin flow analysis result is read. Here, the resin flow analysis is a simulation of the resin flow direction (weld line) when the resin is injected from the previously designed gate. In this analysis, the arrival point of the resin is obtained as the final filling position.

  Next, in step P3, the final filling position is displayed on the display 19 so as to overlap the top view of the core including the product shape as shown in FIG. Thereafter, in step P4, it is detected whether or not the resin (weld line) intersects the parting line. Here, when it is detected that the resin can be normally filled in the cavity core (YES), the process proceeds to Step P5, and the intersection of the parting line and the final filling position is calculated.

  Thereafter, in step P6, the designer instructs the direction of attaching the gas vent with the intersection as the starting point. Then, in step P7, the designer instructs the position to attach the gas vent. The position of the gas vent is above or below the parting surface.

  Thereafter, in step P8, the width of the gas vent is input, the process proceeds to step P9, and the resin to be used is input. Next, in step P10, the designer determines the depth of the gas vent from the resin material database. For example, the designer specifies the depth and width of the gas vent. In step P11, a gas vent groove is created by sweeping the cross section (rectangle). Here, as shown in FIG. 60, the gas vent 304 is displayed on the display 19 so as to overlap the top view of the mold base. The gas vent 304 is provided at a position facing the gate 301. In FIG. 59, a broken line circle view shows a cross-sectional view of the gas vent 304 taken along the line A-A '. In the broken line circle diagram, a represents the depth of the gas vent, and b represents the width thereof.

  When it is detected in step P4 that the resin does not cross the parting line (NO), the process proceeds to step P12. As a result of the resin flow analysis, when there is a possibility that the resin entrains air and generates a void 305 at the position shown in FIG. 60A, the resin does not cross the parting line.

  Therefore, in step P12, it is determined whether or not there is an ejector pin hole 303 near the void 305. If it is determined that the ejector pin hole 303 is present (YES), the process proceeds to step P15. If it is determined that there is no ejector pin hole 303 (NO), the process proceeds to step P13, and the center position of the void 305 is calculated. Thereafter, in step P14, the gas vent design unit 65 arranges the ejector pin hole 303 at the center of the void 305, and inputs the resin to be used in step P15.

  Next, in step P16, the designer selects whether or not the dimensional tolerance of the ejector pin hole 303 is increased. When enlarging the dimensional tolerance is selected (YES), the process proceeds to step P17, and the designer determines the maximum gap from the resin material database. The dimensional tolerance will be described in the nineteenth embodiment. In step P18, the dimensional tolerance of the ejector pin hole is changed to +0, −maximum gap.

  Here, the display 19 displays a diagram before and after the enlargement of the ejector pin hole 303 as shown in FIG. In FIG. 60 (B), φD is the diameter of the ejector pin hole 303. When taking a large gap, φD + 0.01 to φD + 0.03 is calculated.

  Further, when the designer selects in step P16 the case where the dovetail groove for air venting as shown in FIG. 60C is provided on the peripheral surface of the ejector pin 306 without increasing the dimensional tolerance (NO). Shifts to Step P19 to determine the depth of the dovetail groove from the resin material database. In step P20, the number of dovetail grooves is determined. In FIG. 60C, the depth of the dovetail is 0.02 to 0.04 mm, and the number is four.

  In step P21, the length of the dovetail is input. Thereafter, in step P22, a gas bend is created by sweeping the cross section (semicircle). Thereby, when resin is pushed into the mold, it is possible to design a gas vent 304 for extracting air from the space (cavity) portion of the cavity core.

  In this way, in the mold designing method according to the fifteenth embodiment, the gas bend for extracting the gas to the position where the resin finally reaches from the flow analysis result superimposed on the perspective view of the mold in Step P3. Since the 304 is disposed, the gas bend 304 can be disposed at a position suitable for the resin flowing into the hollow portion of the mold block 100 without depending on the experience and intuition of the designer. Further, since the final filling position of the resin can be calculated using flow analysis CAE (Computer-Aided Energing), it can be designed without any knowledge about the injection molding resin.

  In the embodiment of the present invention, when a method of extracting gas using the ejector pin 306 is adopted, the position of the ejector pin 306 is changed, the dovetail groove 307 is provided in the ejector pin 306, the ejector pin 306 Corrections can be made to change dimensions.

  For this reason, if the resin cannot reach the gas bend 304 and the gas stays in the hollow portion of the mold block 100 to form the void 305 based on the flow analysis result, the degassing design using the ejector pin 306 can be performed. Since an acceptable gap (width, depth, etc.) is displayed on the display 19, the designer can design the gas vent 304 by inputting necessary dimensions via the keyboard 17.

  In the embodiment of the present invention, if the designer designates the shape and specification of the gas vent 304 that has been patterned in advance through the keyboard 17, the shape of the designated gas vent 304 is arranged in the mold model. The designer does not have to design the gas vent 304. The burden on the designer is greatly reduced. Since the necessary parameters are patterned, the work can be simplified. Since patterning reduces the number of input items, the gas vent 304 can be designed in a short time.

(16) Sixteenth Embodiment FIGS. 61 and 62 show image views of a display when ejector pins are designed according to a sixteenth embodiment of the present invention. FIG. 63 shows an ejector pin design flowchart according to the sixteenth embodiment of the present invention. In this processing, the ejector pin design unit 66 designs ejector pins.

  In FIG. 61, first, the designer selects “ejector pin design” from the mold part design menu screen displayed on the display 19. In step P1, the cavity core data D4 is read. In step P2, the display 19 displays a top view of the core side. Next, the position of the ejector pin 306 is displayed on the display 19 in step P3.

  Thereafter, the designer selects the cross-sectional shape of the ejector pin 306 in step P4. When the ejector pin of the round pin is selected (YES), the hole design for the round pin is selected on the menu screen as shown in FIG. Here, a round pin hole as shown in FIG. 52 (C) is displayed on the display 19. The designer arranges the hole for the round pin with reference to the bottom surface of the plate. Also, the minimum hole depth, hole diameter, and hole diameter + 1 (1 is escape: gap) of the round pin hole are designated. And it transfers to step P5 and inputs a pin diameter. Thereafter, the process proceeds to step P7.

  When the designer selects a square pin (NO), “Square Pin Hole Design” is selected on the menu screen as shown in FIG. And it transfers to step P6 and inputs a pin diameter. Here, a square pin hole as shown in FIG. 52 (D) is displayed on the display 19. The designer places the square pin holes with reference to the bottom surface of the plate. In addition, the designer specifies the minimum hole depth of the square pin hole, the square hole dimensions (X, Y), and the square hole dimension +1 (1 is the nominal).

  In step P7, the length of the sliding portion of the ejector pin 306 is input. Next, in step P8, the stroke of the ejector pin 306 is input. Thereafter, the process proceeds to step P9, and the suitable ejector pin 306 is read from the base file 12. The ejector pins 306 are databased as mold standard parts. In step P10, the pin design unit 66 inputs a pin gap (clearance).

  In step P11, a hole is created in the penetrating part. Here, as shown in FIG. 64, the ejector pin 306 and the ejector pin hole 303 are displayed on the display 19 so as to overlap the top view of the product shape. The pin holes 303 are opened in the core 4 nesting, the movable side plate (core plate), the movable side receiving plate and the upper ejector plate.

  Thereafter, in step P12, it is checked whether or not the ejector pin 306 has been designed. If the pin design has not been completed (NO), the process returns to Step P3 and Steps P3 to P11 are repeated. When the pin design is completed (YES), the control is terminated. Thereby, an ejector pin can be designed.

  In this way, in the mold designing method according to the sixteenth embodiment, the designer performs any one of the structures such as the cross-section, dimension, sliding portion length, etc. of the ejector pins patterned in advance in step P4. The selected ejector pin is displayed on the display 19 in a perspective view of the mold model. Then, the designer can design the ejector pin 306 by inputting the designation and numerical values of the position, dimensions, shape, etc. via the keyboard 17, so the designer does not have to design the structure of the ejector pin from the beginning. It will be over. Thereby, there exists an effect that a designer's burden is reduced significantly. Since the types of ejector pins 306 such as round pins, square pins, straights, and steps are patterned as parameters, the operation is simplified. Since the number of input items becomes very small by patterning, the ejector pin 306 can be designed in a short time.

(17) Seventeenth Embodiment FIG. 65 shows an image diagram at the time of designing a cooling path according to a seventeenth embodiment of the present invention. FIG. 66 is an isometric view of the mold at the time of designing the cooling path according to the seventeenth embodiment of the present invention. In this process, the temperature adjustment structure design unit 67 designs a cooling path for cooling the mold.

  FIG. 65 shows a menu screen displayed on the display 19. From this menu screen, the designer selects “8. Cooling path design”. The menu screen displays selection items for creating / deleting a cooling path, designation items for a cooling path creation surface, input items for a cooling path hole diameter, and input items for arrangement coordinates. The display 19 displays the XZ plane (front) and YZ plane (side) of the cooling path designated by the designer in two dimensions, displays the hole diameter of the cooling path as a numerical value, and shows the arrangement coordinates of the cooling path Is displayed as a numerical value. FIG. 66 shows a three-dimensional display of the cooling path in the mold block containing the mold. In the present embodiment, two cooling paths are provided in the core 4.

  In FIG. 65, the designer first displays a mold part design menu screen on the display 19 and selects “cooling path design”.

  Then, an isometric view of a mold including the cavity 3 and the core 4 as shown in FIG. 66 is displayed on the display 19. In FIG. 66, 308 is a cooling pipe. The cooling pipe 308 cools the mold when resin molding is performed.

  A temperature adjustment structure design unit (hereinafter simply referred to as a temperature control design unit) 67 determines a plane on which the cooling pipe 308 is arranged in accordance with the designer's specification. This plane is set as the XY plane during the cooling path design. Then, the cooling pipe 308 is arranged at a position designated by the designer. At this time, the designer specifies the hole diameter of the cooling pipe 308. In the embodiment of the present invention, a plurality of positions can be designated continuously. By pressing the “Cancel” button on the menu screen, the position designation is completed.

  In this way, in the mold designing method according to the seventeenth embodiment, the designer selects one of the structures of the cooling pipe 308 that is patterned in advance, so that the display 19 is selected. Tube 308 is displayed in the perspective view of the mold model. The designer can easily design the structure of the cooling pipe 308 by inputting numerical values such as the hole diameter, position, and PT screw name from the keyboard 17, so the designer can design the structure of the cooling pipe 308 from the beginning. You don't have to. This greatly reduces the burden on the designer. Since necessary parameters are patterned, the design work is simplified. Since the number of input items is greatly reduced by patterning, the cooling pipe 308 can be designed in a short time.

(18) Eighteenth Embodiment FIGS. 67 (A) and (B) are cross-sectional views when a link is designed in the three plates according to the eighteenth embodiment of the present invention. In FIG. 67 (A), 401 is a fixed side mounting plate constituting the main body of the injection molding apparatus, 5 is a runner stripper plate provided with a runner, 3A is a cavity plate provided with a cavity, and 4A is a core. Is a core plate. These plate structures are patterned in advance.

  The designer selects the mold opening control structure from the menu screen displayed on the display 19. For the mold opening control structure, links, puller bolts, etc. are patterned. The display 19 displays a fixed side mounting plate 401, a runner stripper plate 5, a cavity plate 3A and a core plate 4A as shown in FIG. 67 (A). Then, the designer inputs necessary dimensions such as the positions of the plates 5, 3A and 4A, the opening amount between the plates 5 and 3A, and the opening amount between the plates 3A and 4A via the keyboard. To do.

  Next, in FIG. 67 (B), the interference (whether or not they contact) between the link (coupling portion) and the plates is checked. Here, reference numeral 402 denotes a link, which is a component that joins these three plates. Here, in the display 19, as shown in FIG. 67 (B), the fixed side mounting plate 401, the runner stripper plate 5, the cavity plate 3A and the core plate 4A are overlapped, and the three plates 5, 3A and 4A are connected by links. Display the figure.

  Then, the designer checks whether or not there is a gap between the fixed side mounting plate 401 and the link 402. This clearance check is performed to confirm whether the link 402 and the fixed-side mounting plate 401 can be assembled without competing when the three plates 5, 3A and 4A are clamped. When there is no gap between the two, a warning / interference amount or the like is displayed on the display 19. The designer can make corrections while looking at the display 19.

  In this way, in the mold designing method according to the eighteenth embodiment, when the designer selects any of the pre-patterned link 402 structures, the display 19 displays the selected link 402 as a mold. Display on the perspective view of the model. Then, the designer inputs an opening amount between each of the plates 5, 3 </ b> A, and 4 </ b> A via the keyboard 17 to check whether or not there is a gap between the fixed side mounting plate 401 and the link 402. be able to.

  Therefore, the structure of the link 402 can be designed by inputting the opening amount necessary for opening the mold of the injection molding apparatus, so that the designer does not need to design the structure of the link 402 from the beginning. The burden on the designer is greatly reduced. It is possible to design without knowing the mold opening operation of the three-plate mold. Since the mold opening structure is patterned, the number of input items is very small, and links in three plates can be designed in a short time.

(19) Nineteenth Embodiment FIG. 68 shows a dimensional diagram of a part having dimensional tolerances according to a nineteenth embodiment of the present invention. In each embodiment of the present invention, when a dimensional tolerance is determined between parts of a mold model, as shown in FIG. 68, a one-sided tolerance of a given part dimension is automatically corrected to a central tolerance. can do. For example, as shown in FIG. 68, the display 19 displays (1) a dimension 50 as a certain width of a part, and sets upper limit +0 and lower limit −0.2 as “50 ⁺⁰ _−0.2 ” as one-side tolerances. Is displayed. Similarly, as the one-side tolerance for the height 5, the upper limit +0.1 and the lower limit −0 are displayed as “5 ^+0.1 ₋₀ ”. The product shape is displayed as a center value. In the drawings, (1) is indicated by a circled number.

  In the embodiment of the present invention, the designer can change the display to the center tolerance through the keyboard 17 as shown in (2). In the drawing, (2) is indicated by a circled number. At this time, the display 19 changes the component width 50, the upper limit +0, and the lower limit −0.2 to 49.9 ± 0.1 as shown in FIG. Further, the height of the part 5, the upper limit +0.1, the lower limit is −0 + 0, and the lower limit −0.2 is changed to 5.05 ± 0.05. Here, the dimension ε is expressed as α ± δ. The central value ε is α + [(β + γ) / 2], and the error δ is [(β−γ) / 2], δ> 0. One-sided tolerance is also called correction direction tolerance.

  Furthermore, in the embodiment of the present invention, as shown in (3), the center tolerance of the part dimensions can be corrected to one-side tolerance, and the display can be changed to the dimension targeted by the designer (working target dimension). . The part width 49.9 ± 0.1 is changed to 49.95. Also, the height of the component is changed from 5.05 ± 0.05 to 5.075. Thereby, as shown in FIG. 68, a correction allowance can be provided in the A direction and B direction of a component. Here, the machining target dimension η is expressed as ε + δ · κ. κ is a target dimension parameter. In the embodiment of the present invention, κ is +1/2.

  When a dimensional tolerance is determined between parts of the mold model, the designer selects either a center tolerance or a one-side tolerance of a given part dimension. Thereby, the display 19 corrects and displays the dimensional tolerance between the parts of the mold model based on either the center tolerance or the one-side tolerance.

  As described above, in the mold designing method according to the nineteenth embodiment of the present invention, when the mold dimensions and the part dimensions are given by the one-side tolerance, the display 19 is instructed by the designer according to the one-side tolerance. Is displayed with the center tolerance corrected. For this reason, it is possible to confirm on the screen the processing dimensions as intended for the mold and parts intended by the designer.

  In the embodiment of the present invention, when the mold dimension and the part dimension are given by the center tolerance, the display 19 corrects the center tolerance to the one-side tolerance and displays it according to the instruction of the designer. For this reason, it is possible to change on the screen the processing dimensions as intended by the designer for the mold and parts. Therefore, the dimension can be changed in the direction in which the correction allowance can be taken and within the allowable tolerance.

  Further, in an embodiment of the present invention, when the designer selects either a center tolerance or a one-side tolerance of the part dimensions via the keyboard 17, the display 19 is based on either the center tolerance or the one-side tolerance. The display 19 corrects and displays the dimensional tolerance between the parts of the mold model. For this reason, it is possible to edit on the screen the machining dimensions intended by the designer for the mold and parts. Therefore, human error due to oversight of dimensional tolerances is eliminated. As a result, it is possible to design a mold in consideration of dimensional tolerances.

  In the first to nineteenth embodiments of the present invention, a method for designing a mold by reading individual data has been described. However, a data group given an attribute (name) is read, A method for designing a mold will be described in a twenty-seventh embodiment.

(20) 20th Embodiment FIGS. 69 to 71 are views (Nos. 1 to 3) for explaining a design item system of a mold design system according to a twentieth embodiment of the present invention. In the twentieth embodiment, mold design items are registered in advance in the system so that mold design can be performed easily and quickly.

  In FIG. 69, reference numeral 22 denotes a mold design item. The design items of the mold are stored in the other memory 21 and are roughly divided into three. Reference numeral 23 denotes a product shape correction item. This correction item is for registering the contents of a meeting between a product designer and a mold designer performed at the time of mold start-up. The contents of the correction items are the determination of the mold opening direction, the provision of a draft to the product, the detection of the undercut, the definition of the parting line, the gate design and file management.

  The design contents are as follows. The mold opening direction is determined as the “Z direction” in which the product is pulled out from the core. The draft angle is applied to facilitate removal of the product from the core. The undercut part prevents the release of the product, so the core is made by nesting it. The parting line is created to obtain a parting surface that divides the mold block into a cavity and a core. The gate is created to inject resin into the cavity between the cavity and the core. The product shape correction data obtained by correcting the product shape according to the product shape correction item 23 is stored in the work memory 13 and managed.

  In FIG. 70A, 24 is a mold part design item. This design item is specially designed for mold designers. Mold shrinkage correction, cavity / core block creation, mold base determination, parting surface creation, gate, runner, sprue design, mold temperature control channel design , Ejector pin design, hole interference check, nesting, slide core design, file management, etc.

  The design contents are as follows. The cavity and core of the mold are designed by changing the dimensional value according to the shrinkage rate of the product in order to improve the releasability of the product. The cavity and core are designed by dividing the mold block by the parting surface. The mold base is designed by selecting the plate to which the cavity and core are to be attached and its fixed parts. The parting surface is designed in consideration of the parting line. The gate, runner, and sprue serving as the resin inflow path are designed by selecting the cross-sectional shape according to the viscosity of the resin. The mold temperature adjusting water channel (cooling water channel) for adjusting the temperature of the mold is designed in consideration of other hole shapes.

  The ejector pin is designed while checking for interference with the mold temperature control channel. The undercut part of the product is created by dividing the core into nested parts. Nested parts are designed to slide in the X or Y direction.

  In FIG. 70B, reference numeral 25 denotes a manufacturing model creation item. This creation item is incorporated for mold designers and mold manufacturers. The contents of the created items are discharge electrode design and file management. The discharge electrode is a manufacturing tool for processing the inside of the cavity. In this manufacturing tool, the inner edge of the cavity is processed into a cylindrical surface in order to round the edge of the molded product. The machining data (NC data) for manufacturing this electrode is stored in the work memory 13 and managed. These design items may be stored in the memory 21 shown in FIG. Also, these design items are displayed on the display 19 shown in FIG. 1 when the system is activated.

  FIG. 71 shows usage categories of design items of the mold design system. In FIG. 71, a product designer designs a product shape to be molded with an injection mold. Then, the product designer determines the mold opening direction, gives a draft to the product, detects the undercut part, defines the parting line, defines the gate, and manages the file according to the product shape correction item 23 of the mold design system. . The product designer gives the product shape correction data to the mold designer. This product shape correction may be performed by a mold designer.

  Next, the mold designer follows mold design item 24 to correct molding shrinkage, create cavity / core block, determine mold base, create parting surface, gate, runner, sprue design, mold temperature control channel design, ejector pin Design, hole interference check, nesting, slide core design, file management, etc. The mold designer passes mold part data to the mold manufacturer. Thereafter, the mold manufacturer performs discharge electrode design, file management, and the like in accordance with the manufacturing model creation item 25. The production model may be created by a mold designer.

  As described above, according to the design item system of the mold design system according to the twentieth embodiment of the present invention, there are three main mold design items, that is, product shape correction item, mold part design item, and manufacturing. It is divided into model creation items for use and registered in the system.

  Therefore, according to the product shape correction items that are the contents of the meeting between the product designer and the mold designer performed at the time of mold start-up, the mold opening direction is determined, the draft is given, the undercut is detected, the parting line is defined and Gate design etc. can be performed.

  In addition, according to the mold part design items dedicated to the mold designer, mold shrinkage correction, cavity / core block creation, mold base determination, parting surface creation, gate, runner, sprue design, mold temperature control channel design, Ejector pin design, hole interference check, nesting, slide core design, etc. can be performed.

  Furthermore, the discharge electrode can be designed according to the production model creation items incorporated for the mold designer and mold manufacturer. Thus, the software resources of the system can be used jointly by the product designer, mold designer and mold manufacturer, so that the mold can be designed easily and quickly. In addition, it is possible to smoothly perform the meeting at the time of mold design and exchange of product shape data, and the process between product design and mold design can be shortened. A method for designing a tool for manufacturing mold parts will be described in a twenty-ninth embodiment.

(21) 21st Embodiment FIG. 72 is a flowchart for detecting an undercut portion of a product according to a 21st embodiment of the present invention. 73 and 74 show supplementary explanatory diagrams thereof. In the twenty-first embodiment, a case will be described in which an undercut portion of a product shape 26 having two eaves shapes as shown in FIG. 73 (A) is detected. In FIG. 73A, 26A is a first eaves shape projecting laterally from one side surface of the product shape 26, and 26B is a second eaves shape provided at the lower part of the first eaves shape 26A. . It is detected whether or not the space between these two shapes 26A and 26B is an undercut portion 26C.

  In FIG. 72, first, in step P1, the designer selects one surface constituting the product shape 26. For example, the upper surface of the eaves shape 26A as shown in FIG. 73 (B) is selected. In FIG. 73B, the display 19 images the selected surface in a grid pattern.

  Next, in step P2, the parting line creation unit 41 creates a point sequence on the upper surface of the eaves shape 26A. It is desirable that there are a plurality of point sequences. For example, it is created on the intersection of each grid. In the cross-sectional view of the product shape 26 in FIG. 73 (C), the mark X is the position of the point sequence, and only one point is shown. Next, in step P3, the parting line creation unit 41 projects the point sequence on the surface of the eaves shape 26A in the + Z direction. In FIG. 73C, black circles are the positions projected in the + Z direction.

  In step P4, the parting line creation unit 41 detects whether one or more point sequences can be projected onto another surface. In the example of FIG. 73C, points are projected (two-point projection) on the upper and lower edges of the eaves shape 26B. If no point sequence can be projected onto another surface (NO), the process proceeds to step P8. When one or more point sequences can be projected onto another surface (YES), the process proceeds to Step P5.

  In step P5, the parting line creation unit 41 projects the point sequence on the surface of the eaves shape 26A in the -Z direction. In the example of FIG. 73C, a white circle is a position projected in the −Z direction. In step P6, the parting line creation unit 41 detects whether one or more point sequences can be projected onto another surface. In the example of FIG. 73C, the point sequence is projected (one point projection) onto the lower edge of the eaves shape 26A.

  If no point sequence can be projected onto another surface (NO), the process proceeds to Step P8. When one or more point sequences can be projected onto another surface (YES), the process proceeds to Step P7. In step P7, the work memory 13 stores the surface as a surface constituting the undercut portion 26C.

  In step P8, the designer determines whether undercut detection has been completed for all surfaces. If the detection of the undercut portion is not completed (NO), the process returns to step P1 to select one surface, and thereafter, steps P2 to P8 are repeated.

  For example, in step P1, the upper surface of the eaves shape 26B as shown in FIG. 74A is selected. In FIG. 74A, the display 19 images the selected surface in a grid pattern.

  Next, in step P2, the parting line creation unit 41 creates a point sequence on the upper surface of the eaves shape 26B. In FIG. 74 (B), the x mark indicates the position of the point sequence, and only one point is shown. In this example, a point is projected (three-point projection) onto the lower edge of the eaves shape 26B and the upper and lower edges of the eaves shape 26A.

  Next, in step P3, the parting line creation unit 41 projects the point sequence on the surface of the eaves shape 26B in the + Z direction. In step P4, the parting line creation unit 41 detects whether one or more point sequences can be projected onto another surface. In the example of FIG. 74A, since there is no projection plane, points on the surface of the eaves shape 26B are not projected in the + Z direction (zero point projection). If no point sequence can be projected onto another surface (NO), the process proceeds to step P8.

  When the detection of the undercut portion is completed for all the surfaces in step P8 (YES), the process proceeds to step P9 and the display 19 highlights the constituent surfaces of the undercut portion.

  Thus, in the product shape undercut detection method according to the twenty-first embodiment of the present invention, a point sequence is created on the surface constituting the product, and the other surface located in the ± Z direction is formed. By detecting whether or not this point sequence can be projected, it is possible to detect the undercut portion easily and in a shorter time than in the seventh embodiment of the present invention.

(22) Twenty-second Embodiment FIG. 75 is a parting line extraction flowchart according to the twenty-first embodiment of the present invention. 76 and 77 show supplementary explanatory diagrams thereof. In the twenty-first embodiment, the parting line extraction function is simplified as compared with the first embodiment.

  In FIG. 75, first, in step P1, the designer displays the shape of the product shape 27 in the + Z direction on the display 19. FIG. 76A is a perspective view of a plastic product shape 27, and FIG. 76B shows a view of the product shape 27 viewed from the mold opening direction (+ Z direction). The edge on the back side of the product shape 27 is not displayed on the display 19. Since the back edge of the product shape 27 is an obstacle to the extraction of the parting line, the shape data related to this is saved in the memory.

  Next, in step P2, the parting line creation unit 41 disassembles visible edges and contour lines (ridge lines) of the product shape 27 into elements. In the example of FIG. 76 (B), the outermost contour and edge of the product shape 27 are broken down into straight lines and arcs (hereinafter simply referred to as line elements).

  Next, in step P3, the parting line creation unit 41 detects a line element having a maximum value in the horizontal direction (X direction) of the display screen in accordance with an instruction from the designer. This is because the parting line extraction candidates are narrowed down to some extent by roughly searching for line elements. The detected line element is stored in the work memory 13.

  In step P4, the parting line creation unit 41 detects another line element adjacent to the line element having the maximum value in the X direction. At this time, the display 19 displays a perspective view of the product shape 27 as shown in FIG. Then, the shape data relating to the back edge is read from the work memory 13 and displayed with the parting line superimposed on the perspective view of the product shape 27. Other line elements adjacent to the line element having the maximum value in the X direction are stored in the work memory 13 as parting line candidates.

  Next, in step P5, the designer places the keyboard 17 on the system according to the case where there is no other line element adjacent to the line element and when there are two or more line elements as shown in FIG. Give instructions through. When there is no other line element adjacent to the line element, the content of the instruction moves to Step P6 and manually creates the line element. If there are two line elements (1) and (2) adjacent to the line element as shown in FIG. 77 (C), the process proceeds to step P7, where the designer selects the line element (1) or Select either (2) manually. As shown in FIG. 77 (B), when there is one other line element adjacent to the line element, the process proceeds to step P8.

  In step P8, the system stores another line element adjacent to the line element in the work memory 13 as a parting line candidate. In step P9, it is detected whether or not the line element having the maximum value in the X direction is detected as an adjacent curve, that is, whether or not the line element is in a closed loop.

  If the line element is not in a closed loop (NO), the process returns to step P5, and steps P5 to P8 are repeated until the line element is in a closed loop.

  When the line element becomes a closed loop in step P9, that is, when the line element having the maximum value in the X direction is detected as an adjacent curve (YES), the process proceeds to step P10, and the line element is changed to the party. Extract as a gline. In FIG. 77C, the parting line of the product shape 27 is shown by a solid line.

  Thus, in the parting line extraction method according to the twenty-second embodiment of the present invention, by searching for the line element having the maximum value in the X direction of the product shape viewed from the mold opening direction in Step P3. The extraction candidates for parting line are narrowed down to some extent.

  For this reason, a parting line can be extracted in a short time compared with the first embodiment. In addition, a parting line can be extracted in a very short time as compared with the conventional case of extracting from a two-dimensional drawing.

(23) Twenty-third Embodiment FIGS. 78 and 79 are flowcharts (parts 1 and 2) for creating a parting surface according to a twenty-third embodiment of the present invention. 80 and 81 show supplementary explanatory diagrams thereof. Unlike the ninth embodiment, the 23rd embodiment detects a plane, a cylindrical surface, a conical surface, and a free-form surface depending on whether or not the parting line is on the same plane, and connects these surfaces to each other. This creates a parting surface. This function may be provided to the mold dividing unit 52.

  In FIG. 78, first, in step P1, the system is instructed by the designer to place two adjacent parties in n (n = 1, 2, 3... I, j, k... N) number of parting lines. Select the lines i and j. In the present embodiment, when there is a parting line surrounding the outside of a certain area and a parting line surrounding the inside of the area, the area constitutes a plane.

  Next, in Step P2, it is detected whether or not two adjacent parting lines i and j are present on the same plane. The detection condition at this time is whether or not two end points and one connection point forming the start and end points of the two parting lines i and j exist on the same plane in FIG. When the two parting lines i and j are present on the same plane, for example, the plane N as shown in FIG. 80B (YES), the process proceeds to Step P3. In step P3, it is detected whether or not the parting line k adjacent to the parting line j exists on the same plane. When the two parting lines j and k exist on the same plane N (YES), the process proceeds to Step P8. If the two parting lines j and k do not exist on the same plane N in step P3 (NO), the process proceeds to step P4 and the parting lines i and j are stored as elements of the plane N.

  If the two parting lines i and j do not exist on the same plane in step P2 (NO), the process proceeds to step P5 and the parting line i is stored as an unconfirmed element. In the example of FIG. 80B, the parting line adjacent to the plane N of the product shape 28 is an unidentified element. This is later stored as a line element on the plane N + 2.

  Then, the process proceeds to step P6, and it is further detected whether or not the parting line k adjacent to the parting line j exists on the same plane. If two parting lines j and k are present on the same plane (YES) in step P6, the process proceeds to step P8. If the two parting lines j and k do not exist on the same plane in step P3 (NO), the process proceeds to step P4 and the parting lines i and j are stored as elements of the plane N + 1.

  In step P8, it is detected whether or not the last parting line n and the first parting line 1 are on the same plane. If the parting line n and the parting line 1 do not exist on the same plane (NO), the process returns to Step P1 to select two adjacent parting lines i and j, and thereafter, Steps P2 to P8 are performed. repeat. If the parting line n and the parting line 1 are present on the same plane in step P8 (YES), the process proceeds to step P9 to determine whether or not all planes on which the parting line exists have been detected. Judge what. When all the planes are detected (YES), the process proceeds to Step P10. If all the planes have not been detected (NO), the process returns to Step P1, selects two adjacent parting lines i and j, and then repeats Steps P2 to P8 so that there is a parting line. All planes to be detected are detected.

  Thereafter, in step P10, the designer detects a line element adjacent to the plane N + 1 of the product among the unconfirmed elements while looking at the product shape 28. This detection of the line element is for confirming the existence of a plane adjacent to the plane N + 1. When all the planes are detected in steps P2 to P8, the line element adjacent to the plane N + 1 is one of a cylindrical surface, a conical surface, and a free-form surface.

  Accordingly, in step P11, the designer first detects a cylindrical surface and a conical surface from the remaining unconfirmed elements. Cylindrical surfaces and conical surfaces can be seen at the corners where the inner surface and the surface of the product shape 28 intersect. In step P12, other unconfirmed elements are set as sweep plane (free-form surface) elements. In FIG. 80 (C), 28A indicates the sweep surface of the product shape 28. This surface is the part that finishes the core shape into a sweep surface.

  Thereafter, in step P13, a boundary line (hereinafter referred to as an intersection line) where two adjacent surfaces intersect is detected. In the example of FIG. 81 (A), an intersection line of the product shape 28 is detected at a portion where the plane N and the plane N + 2 intersect. By detecting the intersection line, interference between the planes can be prevented.

  Next, in step P14, the surfaces are connected and shaped (trimmed). In the example of FIG. 81A, the plane N and the plane N + 2 are connected. Further, the plane N + 2 and the cylindrical surface are connected.

  In step P15, the shaped surface is determined as the parting surface of the product shape 28. FIG. 81B shows the parting surface of the product shape 28. In FIG. 81 (B), the parting surface of the product shape 28 can be created by connecting the planes N, N + 1, N + 4, the planes N + 2, N + 3 including the cylindrical surface, and the sweep plane N + 5. When the parting surface is determined, the mold block 29 is divided by this parting surface as in the ninth embodiment. Thereby, a cavity block and a core block can be designed.

  In this way, in the method for creating a parting surface according to the twenty-third embodiment of the present invention, a plane, a cylindrical surface, a conical surface, and a free surface are detected by detecting whether or not the parting line is in the same plane. Parting surfaces are created by extracting curved surfaces and connecting these surfaces.

  Therefore, as in the ninth embodiment, the main parting line does not have to be extended in the X and Y directions and projected onto the mold block, so that the parting surface of the product shape 28 can be easily created.

(24) Twenty-fourth Embodiment FIG. 82 is an ejector pin design flowchart according to the twenty-fourth embodiment of the present invention. 83 and 84 show supplementary explanatory diagrams thereof. In the 24th embodiment, unlike the 16th embodiment, when the designer specifies the position of the ejector pin, the ejector pin design unit calculates the height.

  In FIG. 82, first, in step P1, the designer inputs the design dimensions of the ejector pin. The design dimensions of the ejector pins are input to the system via the keyboard 17. At this time, a menu screen as shown in FIG. 83 is displayed on the display 19. Unlike the image diagram described in the sixteenth embodiment, this menu screen displays the shape of the ejector pin hole and an instruction frame for inputting the dimension value in one screen. The designer inputs a dimension value in this instruction frame. The dimension values are the hole diameter of the ejector pin, the clearance hole diameter, the guide length, the collar diameter, and the like. The collar is a retainer and is provided at the lower end of the ejector pin.

  Next, in step P2, the display 19 displays the shape of the core block viewed from the + Z direction in accordance with the designer's instruction. Next, in step P3, the designer designates the position of the ejector pin on the display 19. In the example of FIG. 84 (A), a pin hole is specified in the black circle mark of the core block 30. The ejector pin design unit 66 detects designated pin position coordinates X and Y. The pin position coordinates X and Y are displayed as a distance from the center of the mold.

  The display 19 displays the pin position coordinates X and Y within the designated frame. The designer may correct this value via the keyboard 17.

  Thereafter, in step P4, the ejector pin design unit 66 creates a circle centered on the pin designation position. Next, in step P5, the circle is projected onto the mold part. The mold parts are a core block 30, a core plate (not shown), a receiving plate, an upper ejector plate, and the like. At this point, it is assumed that the design of the mold base has been completed.

  Further, at step P6, the ejector pin design unit 66 detects the minimum height and the maximum height of the ejector pin. The height of the pin varies depending on the shape of the product surface. For example, when the product surface is oblique as shown in FIG. 84 (B), it is necessary to process the tip of the ejector pin obliquely. Thus, the ejector pin has a minimum height and a maximum height. In FIG. 84 (B), the black circle mark is the maximum height of the ejector pin, and the black star mark is the minimum height of the ejector pin.

  In step P7, the ejector pin design unit 66 uses the minimum height of the ejector pin as a reference for calculating the guide length. The guide length is the moving distance (protruding stroke) of the pin when the molded product protrudes. The maximum height of the ejector pin is the distance from the lower ejector plate surface to the tip of the ejector pin, and the minimum height of the ejector pin varies depending on the inclination of the product surface. Here, the ejector pin design unit 66 reads the dimension values relating to the thickness of the core block 30, the core plate, the receiving plate, the upper ejector plate, and the like from the work memory 13, and adds them all. Based on this addition result, the maximum height of the ejector pin is calculated.

  In step P8, the ejector pin design unit 66 creates the shape of the ejector pin and its hole based on the hole diameter, relief hole diameter, guide length, collar diameter, etc. designated by the designer.

  In step P9, the designer determines whether all ejector pins have been designed. When all the ejector pins have been designed (YES), the process proceeds to Step P10. If the design of the ejector pin is not completed (NO), the process returns to step P1, the design dimension of the ejector pin is input, and the subsequent steps P2 to P9 are repeated.

  In step P10, the designer determines whether to output ejector pin design information. When the design information is output (YES), the process proceeds to step P11 and the design information is displayed on the display 19, or the printer 20 is activated to output the design information on the paper. FIG. 84C shows an example in which the design results of two ejector pins are output on the paper. The output contents are position, hole diameter, escape hole diameter, guide length, ejector pin length, and the like. Note that after the design information is output in step P11, the design of the ejector pin is terminated. Even when information is not output in step P10 (NO), the design of the ejector pin is also finished.

  Thus, in the mold ejector pin design method according to the twenty-fourth embodiment of the present invention, when the designer designates the position of the ejector pin on the display 19, the ejector pin design unit 66 moves the mold on the mold. The positions X and Y of the ejector pins from the center are detected, and the height from the upper ejector plate is calculated. Therefore, even when the mold is complicated, the ejector pin can be interactively designed between the designer and the system.

(25) Twenty-fifth Embodiment FIG. 85A is a design flowchart of a mold base of a mold according to a twenty-fifth embodiment of the present invention, and FIG. 85B is a supplementary explanatory diagram thereof. Show. Unlike the twelfth embodiment, the 25th embodiment differs from the twelfth embodiment in that a designated frame for inputting the overall shape of the mold base that forms the mold in one screen and the dimension values of each component. And are displayed.

  In FIG. 85A, first, in step P1, the designer selects the type of mold base of the mold. At this time, the display 19 displays a menu screen as shown in FIG. The display contents are mold base creation, arrangement determination, dimension correction, mold base storage, mold base call, and the like. When the designer selects “Create mold base”, the display 19 switches to a menu screen indicating the type of mold base. The types of mold bases are the SA type, SC type of 2 plate structure, DA type of 3 plate structure, and DC type. The SA type and SC type are molds composed of two mold plates, a cavity plate and a core plate. The DA type and the DC type are molds composed of three mold plates: a cavity plate, a core plate, and a runner stripper plate. The SA and DA types have a backing plate, and the SC and DA types do not have a backing plate.

  Next, in step P2, the display 19 displays a designated frame for writing the shape and dimension values of the mold base. In the example of FIG. 86, the display 19 has designated frames X, Y, TW, CP, A, B, and the like for inputting the overall shape of the SA type mold base and the dimension values of each component in one screen. U, C, SP, EP, E1, and E2 are displayed. In the display example of FIG. 86, (1) is a fixed side mounting plate, (2) is a fixed side template, (3) is a movable side template, (4) is a receiving plate, (5) and (6) are spacers. Block (7) shows an upper ejector plate, (8) shows a lower ejector plate, and (9) shows a movable side mounting plate. In the drawing, (1) to (8) are indicated by numbers with circles.

  X is the horizontal length of the fixed-side template (2), movable-side template (3) and receiving plate (4), Y is the vertical length of the fixed-side mounting plate (1), and TW is the fixed-side mounting plate The horizontal length of (1), CP is the height of the fixed-side mounting plate (1), A is the height of the fixed-side template (2), B is the height of the movable-side template (3), and U is The height of the backing plate (4), C is the height of the spacer blocks (5) and (6), SP is the lateral length of the spacer blocks (5) and (6), EP is the upper and lower ejector plates (7 ), (8) horizontal length, E1 is the height of the upper ejector plate (7), and E2 is the height of the lower ejector plate (8). The distance between E1 and E2 is 4 mm.

  The designer inputs dimension values to the designated frames X, Y, TW, CP, A, B, U, C, SP, EP, E1, and E2 via the keyboard 17.

  Thereafter, in step P3, the mold base creating unit 61 creates mold base data in accordance with the dimension value input by the designer. Since the mold base data creation method has been described in the twelfth embodiment, a description thereof will be omitted.

  Thus, in the mold base design method according to the twenty-fifth embodiment of the present invention, the designation for inputting the overall shape of the mold base of the mold and the dimension values of each component within one screen is performed. A frame is displayed. Therefore, while confirming the expected completion shape, injection molding can be performed by inputting dimensional values to the designated frames X, Y, TW, CP, A, B, U, C, SP, EP, E1, E2 of each component. Mold can be designed. Easy to design.

(26) Twenty-sixth Embodiment FIG. 87 shows a flowchart for using a configuration file of a mold design system according to a twenty-sixth embodiment of the present invention. FIG. 88 is a supplementary explanatory diagram thereof. In the twenty-sixth embodiment, a method of using a tool for supporting a mold design system is shown. In FIG. 87, first, in step P1, the designer saves a file storing default values in the system. This file is written with a tool for supporting the mold design system, and is written in the memory 21 as shown in FIG.

  In FIG. 88, the tool content includes designation of display colors for lines, characters, and areas, an output method of design information, a reference value (design data) necessary for each design, and a method for representing each part data. In this embodiment, the product shape data is displayed by “Cyan”, the undercut part is displayed by “Pink”, the parting line is displayed by “YELLOW”, and the cavity / core is displayed by “MAGENTA”. The mold base is indicated by “WHITE”, and the ejector pin is indicated by “BLUE”. The display 19 displays lines, characters and areas according to such colors.

  In the present embodiment, the undercut portion is output to the display 19 by “GRPHICS”, and the ejector pins and the tool for manufacturing the mold parts are output by the printer 20 by “PAPER”.

  Further, in the present embodiment, 3 mm is set as the reference distance for the allowable distance (hole interference check distance) between the hole for the ejector pin and the other hole, and the protrusion amount α with respect to the length of the ejector pin is 0.1 mm. Is the reference value. Further, 10 mm is registered as the reference value for the extrusion amount of the tool for manufacturing the mold part, and 10 mm is registered as the reference value for the offset amount of the base of the manufacturing tool.

  In the design of the ejector pin, “CORE-BLOCK” represents the component data related to the core block, “CORE-PLATE” represents the component data related to the core plate, and “EPR” represents the component data related to the upper ejector plate. The part data relating to the lower ejector plate is indicated by “EP”.

  In the cooling channel design and nesting design, “CAVITY-PLATE” represents the component data related to the cavity plate, “CAVITY-BLOCK” represents the component data related to the cavity block, and “CORE-PLATE” represents the component related to the core plate. Data is expressed, and “CORE-BLOCK” indicates component data related to the core block.

  Next, in step P2, the designer determines whether or not to change the default value. If the default value is to be changed (YES), the process proceeds to step P3 and the default value is changed. Here, the designer changes the default value by rewriting the contents of the configuration file. Thereby, designation of display colors of lines, characters, and areas, an output method of design information, a reference value necessary for each design, and a notation method of each component data can be freely changed.

  If the default value is not changed in step P2 (NO), the process proceeds to step P4 to start the system. When the system is activated, the display 19 displays the product shape as “CYAN” according to the configuration file.

  Next, when the designer specifies the information output method “GRPHICS” when detecting the undercut portion in step P5, the display 19 displays the undercut portion according to the configuration file.

  Further, when creating the parting in step P6, the display 19 displays the color of the parting as “YELLOW” according to the configuration file.

  Further, when creating the mold base and cavity / core in step P7, the display 19 displays the color of the mold base by “WHITE” and the color of the cavity / core by “MAGENTA” according to the configuration file.

  Further, at the time of the hole interference check in step P8, the ejector pin design unit 66 executes the interference check between the pin hole and another hole based on the reference value = 3 mm read from the configuration file.

  Next, when designing the ejector pin in step P9, the ejector pin design unit 66 adds the protrusion amount α = 0.1 mm read from the configuration file to the maximum height of the ejector pin.

  Furthermore, when designing an electrode for electric discharge machining in step P10, the designer designs an electrode for electric discharge machining (tool for producing mold parts) based on the extrusion amount read from the configuration file = 10 mm. In addition, the designer designs the electrode base based on the offset amount = 10 mm read from the configuration file.

  As described above, in the method for using the configuration file of the mold design system according to the twenty-sixth embodiment of the present invention, the number of automatic processing increases. In step P3, the display colors of lines, characters, and regions are displayed. The output method of design information, the reference value necessary for each design, and the notation method of each part data can be freely changed. Therefore, a mold design system suitable for the designer can be constructed. Also, by preparing a configuration file in advance, it is possible to reduce the number of input items at the time of design.

(27) Twenty-Seventh Embodiment FIG. 89 is a mold design flowchart according to the twenty-seventh embodiment of the present invention. FIG. 90 shows a supplementary explanatory diagram thereof. In the 27th embodiment, in order to improve the handleability of the mold design system, a name (attribute) is given to the data group for designing the mold, and a nested mold or a direct carving mold is assigned according to this attribute. Is to design. In FIG. 89, first, in step P1, the designer assigns the name (attribute) “PART” to the product shape data when the system is activated. If there are multiple data groups, the designer chooses and assigns another name.

  For example, when creating a parting line in step P2, the designer assigns the name “PARTING-LINE” to the data group of the parting line.

  Furthermore, in step P3, the designer selects the data groups “PART” and “PARTING-LINE” when correcting the shrinkage rate. Then, the product shape correction editor 14 reads the data groups “PART” and “PARTING-LINE” from the memories 11 and 13, and automatically corrects the shape of the product as described in the third embodiment.

  Next, when designing the cavity and core in step P4, the designer assigns the name “CAVITY / CORE-BLOCK” to the cavity / core data group. There are data groups for cavities / core blocks when designing nested molds.

  Next, when designing the mold base in Step P5, the designer adds “TCP”, “CAVITY-PLATE”, “CORE-PLATE”, “SP”, “SB”, “EPR”, The names “EP” and “BCP” are assigned. Here, in FIG. 90, reference numeral 31 denotes a fixed-side mounting plate, which is indicated as “TCP” in the system. Reference numeral 32 denotes a fixed side template, which is indicated as “CAVITY-PLATE”. Reference numeral 33 denotes a movable side template, which is indicated as “CORE-PLATE”. Reference numeral 34 denotes a receiving plate, which displays “SP”. Reference numeral 35 denotes a spacer block, which is indicated as “SB”. Reference numeral 36 denotes an upper ejector plate, which is indicated as “EPR”. Reference numeral 37 denotes a lower ejector plate, which displays “EP”. Reference numeral 38 denotes a movable side mounting plate, which is indicated as “BCP”. Reference numeral 39 denotes a fixed side block, which displays “CAVITY-BLOCK”. Reference numeral 40 denotes a movable side block, which displays “CORE-BLOCK”.

  Note that there is a data group related to the cavity plate and the core plate when designing a direct carving mold. Then, the mold base design unit 61 stores data groups “TCP”, “CAVITY-PLATE”, “CORE-PLATE”, “SP”, “SB”, “EPR”, “EP”, and “BCP” in the memory 12. The mold base is created as described in the twelfth and twenty-fifth embodiments.

  Further, when creating a parting surface in step P6, the cavity design editor 15 creates a parting surface based on a data group named “PARTING-LINE”. Then, the designer gives the name “PARTING-SURFACE” to the data group of the created parting surface.

  Next, in step P7, the designer detects whether or not a data group named “CAVITY / CORE-BLOCK” exists. If “CAVITY / CORE-BLOCK” is detected (YES), it corresponds to the design of a nested mold, and the process proceeds to Step P8.

  In step P8, the cavity design editor 15 creates a “PART” cavity in “CAVITY / CORE-BLOCK”. Here, the cavity design editor 15 reads the data group related to “CAVITY / CORE-BLOCK” and “PART” from the work memory 13 and executes data processing as described in the ninth and twenty-third embodiments.

  Next, in step P9, the cavity design editor 15 divides the mold block into two by “PARTING-SURFACE”. Here, the cavity design editor 15 reads the data group “CAVITY / CORE-BLOCK” from the memory 13, and, as described in the tenth embodiment, the cavity block and the core are arranged on the basis of the parting surface. Divide into The two parts are called “CAVITY-BLOCK” and “CORE-BLOCK”. “CAVITY-BLOCK” is a fixed block, and “CORE-BLOCK” is a movable block.

  On the other hand, if there is no data group related to “CAVITY / CORE-BLOCK” in step P7 (NO), the process proceeds to step P10 because it corresponds to the design of the direct carving die. In Step P10, the designer makes the data group relating to “CAVITY-PLATE” and “CORE-PLATE” one data group, and gives the name “CAVITY / CORE-PLATE”. No means to overlap two plates.

  Thereafter, the process proceeds to step P11, where the cavity design editor 15 creates a cavity of “PART” in “CAVITY / CORE-PLATE”. Next, in step P12, the cavity design editor 15 divides the mold block into two by “PARTING-SURFACE”. The two parts are called “CAVITY-PLATE” and “CORE-PLATE”. “CAVITY-PLATE” is a fixed side template, and “CORE-PLATE” is a movable side template.

  Further, when designing the cooling water channel in step P13, the display 19 reads the data group related to “CAVITY-BLOCK” or “CAVITY-PLATE” and “CORE-BLOCK” or “CORE-PLATE” from the work memory 13, The fixed block or fixed mold plate and the movable block or core mold plate are displayed on the display 19.

  Next, when the ejector pin is designed in step P14, the display 19 reads out the data group related to “CORE-BLOCK”, CORE-PLATE ”,“ EPR ”and“ EP ”from the work memory 13, and the core block, the core side The template, the receiving plate and the ejector plate are displayed on the display 19.

  Here, when the position of the ejector pin is designated by the designer, the ejector pin design unit 66 forms a pin hole that penetrates the four related parts of the core block, the core side template, the receiving plate, and the upper ejector plate. In order to penetrate these four related parts all together, it is necessary that the coordinate system of the data group relating to CORE-BLOCK ", CORE-PLATE", "EPR" and "EP" is unified. If the coordinate system is unified, it is possible to design a shape for simultaneously drilling these four related parts at the same position as the position of the designated ejector pin.

  In this way, in the mold designing method according to the twenty-seventh embodiment of the present invention, the names (attributes) are given to the data groups of products and mold parts. Only can be selected. Therefore, since the data group that disturbs the design is saved in the memory, the design work can be simplified.

  In this embodiment, there are four related parts for making pin holes when designing the ejector pins. However, the coordinate system is unified in the data group of the core block, core side template, backing plate and ejector plate. By assigning an attribute, this work can be performed collectively by the ejector pin design unit 66.

(28) Twenty-eighth Embodiment FIG. 91 is a design flowchart for a hole in a mold part according to a twenty-eighth embodiment of the present invention. FIG. 92 shows a supplementary explanatory diagram thereof. The twenty-eighth embodiment shows a method of designing so that holes such as ejector pin holes and cooling water channels do not overlap. In FIG. 91, first, in step P1, the designer stores information on all the holes in the mold part in the system. In the injection shaping mold, threaded holes and guide holes for fixing mold parts, cooling water channels for adjusting the temperature of the mold, ejector pin holes for taking out products from the mold, and the like are targeted. These data are stored in the design data memory 11.

  Next, in step P2, the designer selects a design item related to creating a hole in the mold. Design items include molding shrinkage correction, cavity / core block creation, mold base determination, parting surface creation, gate, runner, sprue design, mold temperature control channel design, ejector pin as described in the twentieth embodiment Design, hole interference check, nesting, slide core design, etc. Here, for example, the designer selects the mold temperature adjustment channel design so as to design the cooling channel 44 in the fixed side mold plate 32 as shown in FIG.

  Next, in step P3, the designer designs the hole shape of the selected design item. Here, the designer designs the cooling water channel as described in the seventeenth embodiment.

  Thereafter, in step P4, the ejector pin design unit 66 detects whether or not the hole designed (hereinafter referred to as a design hole) interferes with another hole. Here, the design hole is the cooling water channel 44, and the other holes are the ejector pin holes 45 penetrating the movable side block 40, the fixed side template 32 and the upper ejector plate 33 as shown in FIG. It becomes. As shown in FIG. 92C, whether or not the cooling water channel 44 and the ejector pin hole 45 interfere with each other is maintained between the position of the cooling water channel 44 and the position of the ejector pin hole 45 at a reference value or more. Judgment by whether or not. As the reference value, the separation reference value = 3 mm as described in the twenty-sixth embodiment is used. This reference value is stored in the configuration file.

  When the cooling water channel 44 and the ejector pin hole 45 do not interfere (NO), the process proceeds to step P5 and the hole shape data of the cooling water channel 44 is stored. If the cooling water channel 44 and the ejector pin hole 45 interfere with each other (YES), the process proceeds to step P6 and a hole interference portion as shown in FIG. Then, the hole shape data at this time is deleted.

  Next, in step P7, the designer determines whether all holes have been designed. If all the holes have been designed (YES), the process proceeds to step P8. If all the holes have not been designed (NO), the process returns to step P3 and the hole shape design is continued. If all the holes have been designed, the process proceeds to step P8, and the designer determines whether or not to change the design item. When the design item is to be changed (YES), the design item is selected by returning to Step P2. If the design item is not changed (NO), the hole design is terminated.

  In this way, in the mold hole designing method according to the twenty-eighth embodiment of the present invention, the interference between the hole being designed and other holes is checked in step P4. A design error such that the water channel 44 and the ejector pin hole 45 overlap can be prevented.

(29) Twenty-ninth Embodiment FIG. 93 is a design flowchart of a tool for manufacturing mold parts according to the twenty-ninth embodiment of the present invention. 94 and 95 show supplementary explanatory diagrams (Nos. 1 and 2). In the twenty-ninth embodiment, particularly, a case is shown in which an electrode (manufacturing tool) that performs electric discharge machining on the inner corner of the cavity block in a round shape is shown. In FIG. 93, first, in step P1, the designer selects a corresponding mold part. For example, when the corner of the product shape 46 as shown in FIG. 92A is to be finished into a round shape, it is necessary to process and place the inner corner of the cavity block into a round shape. Therefore, the designer selects a cavity block 39 as shown in FIG. The display 19 displays the cavity block 39 designated by the designer. The shape data of other mold parts is saved in the memory.

  Next, in step P2, the designer designates the range of the production tool for the mold part displayed on the display 19. The designation of the range here is performed via the keyboard 17. In FIG. 92 (B), the range of the production tool is a region connecting both ends of the concave portion of the cavity block 39. The width of the manufacturing tool is arbitrarily determined by the designer.

  Next, in step P3, the designer creates an extruded shape 47A with this range as a cross section. The extruded shape 47A is composed of a portion from the back side of the cross section to the bottom surface of the cavity block 39 and a portion that is extruded a predetermined distance from the front side of the cross section. Since this predetermined distance is stored in the configuration file as an extrusion amount, it is read out and used. In the present embodiment, the predetermined distance = 10 mm is the reference value.

  Thereafter, in step P4, the shape of the concave portion of the cavity block (mold shape) 39 is transferred to the extruded shape 47A. The method is performed by projecting the cross section of the extruded shape 47A onto the concave portion of the cavity block 39 and transferring the rounded shape, the side surface shape, and the bottom surface shape of the corner. The transfer is performed by subtracting an unnecessary shape portion from the cube formed by the projection of the cross section by a Boolean operation. Thereby, an electrode 47 for electric discharge machining as shown in FIG. 95 (A) can be designed.

  Next, in step P5, the reference position from the center of the injection mold is designated as the electrode 47. In the present embodiment, the reference position is designated as (−200, 350), for example. The designation of the reference position is to enable accurate electric discharge machining of the concave portion of the cavity plate.

  Next, a base 48 is formed on the electrode 47 in step P6. The base 48 is created by adding an offset amount as shown in FIG. The offset amount is read from the configuration file. In this embodiment, 10 mm is the reference value. The thickness of the base is arbitrarily determined by the designer. Thereby, the electrode (manufacturing tool) 47 which discharge-processes the corner inside the cavity block 39 into a round shape can be designed. The shape data of the electrode 47 is converted into numerical control data.

  Thereafter, in step P7, the designer determines whether or not to output information on the electrode 47. When the information of the electrode 47 is output (YES), the process proceeds to step P8, and the display 19 outputs the shape of the electrode 47 on the screen according to the designer's instruction. Further, the printer 20 outputs information on the corresponding parts on the paper according to the instructions of the designer. The output information is a mold part processed by the electrode 47. In the example of FIG. 95C, the corresponding part name is “CAVITY-PLATE”, the reference position of the electrode 47 from the center of the mold is (−200, 350), and the workpiece shape is X = 80, Y = The case of 90, Z = 40 is shown. The output information of the corresponding parts is provided to the mold manufacturer.

  When the information on the manufacturing tool is not output (NO), the process proceeds to step P9, and the designer determines whether or not to design another manufacturing tool. When designing another manufacturing tool (YES), the process returns to Step P1 to select a mold part. Thereafter, steps P2 to P8 are repeated.

  Thus, in the mold part manufacturing tool design method according to the twenty-ninth embodiment of the present invention, when the designer specifies the range of the manufacturing tool in the cavity block 39 in step P2, the system executes step P3. Thus, an extruded shape 47A having a cross section in this range is created. Therefore, the designer can design the electrode 47 for electric discharge machining interactively with the system.

  In the 29th embodiment, the reference position from the center of the injection mold is designated as the electrode 47 in step P5. Therefore, by placing the electrode 47 at the reference position, the electric discharge machining of the concave portion of the cavity plate can be performed accurately.

  As described above, in the injection mold designing apparatus according to the present invention, when a product shape or a mold shape is corrected, a line or a surface that hinders the shape correction is temporarily saved in the storage means. Therefore, it is possible to correct the product shape or the mold shape while looking at the display screen in which only lines and surfaces necessary for shape correction are left. Therefore, the designer can interactively correct the contraction rate, extract the parting line, and provide the draft while interactively displaying the three-dimensional view and the projected view of the product on the display device.

  In the injection mold design method of the present invention, the design items are reduced by patterning the parameters of mold parts and fixed parts, and the product shape and mold shape correction / change are automated. Design man-hours in the work can be greatly reduced.

  In the method for designing an injection mold according to the present invention, the characteristics of a product that is indispensable for the production of a mold can be grasped by extracting candidates for the dividing boundary line of the mold. In addition, the lack of knowledge and experience in mold design can be compensated by using the loop check function of the dividing boundary line and the nested division function, so that even a less experienced designer can perform mold design. .

  This greatly contributes to the provision of a mold design support system that can interactively execute product shape correction, mold design, and design of the manufacturing tool.

It is a block diagram of the design apparatus of the injection mold which concerns on each embodiment of this invention. It is FIG. (1) explaining the display function of the display concerning each embodiment of this invention. It is FIG. (2) explaining the display function of the display which concerns on each embodiment of this invention. It is FIG. (3) explaining the display function of the display which concerns on each embodiment of this invention. It is a design flowchart of the injection mold which concerns on each embodiment of this invention (the 1). It is the design flowchart of the injection mold which concerns on each embodiment of this invention (the 2). It is a design flowchart of the injection mold which concerns on each embodiment of this invention (the 3). It is the perspective view which combined the cavity and core which concern on each embodiment of this invention. It is the perspective view which divided the cavity and core which concern on each embodiment of this invention. It is a cross-section figure of a metallic mold at the time of parting surface design concerning each embodiment of the present invention. It is a perspective view explaining division | segmentation of the nest | insert part which concerns on each embodiment of this invention. They are the perspective view explaining the division | segmentation of the nesting part which concerns on each embodiment of this invention, the side view explaining a nesting part, and a top view. It is a detection flowchart of the outermost periphery of the product shape which concerns on the 1st Embodiment of this invention, and the outline part of a through-hole. It is a perspective view of the product shape at the time of the outermost periphery detection which concerns on the 1st Embodiment of this invention. It is a detection flowchart of the draft plane concerning a 2nd embodiment of the present invention. It is a flowchart for assigning the priority of the draft plane according to the third embodiment of the present invention. It is a perspective view before and behind expansion of the product shape at the time of the priority provision which concerns on the 3rd Embodiment of this invention. It is a figure explaining shrinkage | contraction of the product shape at the time of the priority provision which concerns on the 3rd Embodiment of this invention. It is a provision flowchart of the draft according to the 4th embodiment of the present invention. It is a perspective view explaining the cone at the time of draft angle provision which concerns on the 4th Embodiment of this invention. It is a figure explaining projection of a parting line at the time of draft angle grant concerning a 4th embodiment of the present invention. It is a perspective view of the product shape to which the draft according to the 4th embodiment of the present invention was given. It is a creation flowchart of the parting line which concerns on the 5th Embodiment of this invention. It is a cylindrical perspective view at the time of parting line creation concerning a 5th embodiment of the present invention. It is a top view of the product shape at the time of the parting line creation which concerns on the 5th Embodiment of this invention. It is a check flowchart of the parting line loop based on the 6th Embodiment of this invention. It is a perspective view explaining the line element at the time of the parting line check which concerns on the 6th Embodiment of this invention. It is a detection flowchart of the undercut which concerns on the 7th Embodiment of this invention. It is explanatory drawing of the opening part at the time of the undercut detection which concerns on the 7th Embodiment of this invention. It is a perspective view which detects opening parts other than the undercut concerning the 7th Embodiment of this invention. It is a check flowchart (the 1) of the mold release property of the product shape which concerns on the 8th Embodiment of this invention. It is a check flowchart (the 2) of the mold release property of the product shape which concerns on the 8th Embodiment of this invention. It is a creation flowchart (the 1) of the parting surface which concerns on the 9th Embodiment of this invention. It is a creation flowchart (the 2) of the parting surface which concerns on the 9th Embodiment of this invention. It is a creation flowchart (the 3) of the parting surface which concerns on the 9th Embodiment of this invention. It is a perspective view (the 1) at the time of the cavity core division | segmentation which concerns on the 9th Embodiment of this invention. It is a perspective view (the 2) at the time of the cavity core division | segmentation which concerns on the 9th Embodiment of this invention. It is a perspective view (the 3) at the time of the cavity core division | segmentation which concerns on the 9th Embodiment of this invention. It is a detection flowchart (the 1) of the core depth and the division | segmentation candidate position of a core which concerns on the 10th Embodiment of this invention. It is a detection flowchart (the 2) of the core depth which concerns on the 10th Embodiment of this invention, and a division candidate position of a core. It is a detection flowchart (the 3) of the core depth and the division | segmentation candidate position of a core which concerns on the 10th Embodiment of this invention. It is a side view of the cavity core at the time of the nesting division | segmentation design of the metal mold | die concerning the 10th Embodiment of this invention. It is a provision flowchart of the priority of the dividing line candidate of the core 4 which concerns on the 11th Embodiment of this invention. It is a side view of the cavity core at the time of the priority provision which concerns on the 11th Embodiment of this invention. It is the arrangement | positioning flowchart (the 1) of the mold base which concerns on the 12th Embodiment of this invention. It is the arrangement | positioning flowchart (the 2) of the mold base which concerns on the 12th Embodiment of this invention. It is sectional drawing explaining the fixation structure of the metal mold components which concern on the 12th Embodiment of this invention. It is a perspective view explaining the fixation structure of the metal mold components which concern on the 12th Embodiment of this invention. It is an image figure of the display at the time of the gate design based on the 13th Embodiment of this invention. It is a design flowchart of the gate which concerns on the 13th Embodiment of this invention. It is a perspective view of the gate which concerns on the 13th Embodiment of this invention. It is the perspective view of the gate which concerns on the 13th Embodiment of this invention, and sectional drawing of the ejector pin which concerns on 16th Embodiment. It is another image figure of the display at the time of the gate design based on the 13th Embodiment of this invention. It is an image figure of the display at the time of the runner design based on the 14th Embodiment of this invention. It is a runner design flow chart concerning a 14th embodiment of the present invention. It is a perspective view of the runner based on the 14th Embodiment of this invention. It is sectional drawing of the runner which concerns on the 14th Embodiment of this invention. It is a design flowchart of the gas vent which concerns on 15th Embodiment of this invention. It is a top view of the core 4 at the time of the gas vent design based on 15th Embodiment of this invention. It is the image figure which piled up the top view and the resin flow analysis figure of the core 4 at the time of the gas vent design based on 15th Embodiment of this invention. It is an image figure of the display at the time of ejector pin design which concerns on the 16th Embodiment of this invention. It is another image figure of the display at the time of ejector pin design based on the 16th Embodiment of this invention. It is a design flowchart of the ejector pin based on the 16th Embodiment of this invention. It is a perspective view of the ejector pin and product shape which concern on the 16th Embodiment of this invention. It is an image figure of the display at the time of the cooling path design based on the 17th Embodiment of this invention. It is an isometric view of the metal mold | die at the time of the cooling path design based on the 17th Embodiment of this invention. It is a side view of the metal mold | die at the time of the link design based on the 18th Embodiment of this invention. It is a dimension figure explaining the dimension tolerance which concerns on 19th Embodiment of this invention. It is explanatory drawing (the 1) of the menu system of the metal mold | die design system which concerns on 20th Embodiment of this invention. It is explanatory drawing (the 2) of the menu system of the metal mold | die design system which concerns on 20th Embodiment of this invention. It is a figure explaining the use division of the metal mold | die design item which concerns on 20th Embodiment of this invention. It is a detection flowchart of the undercut part of the product shape which concerns on the 21st Embodiment of this invention. It is explanatory drawing of the product shape and undercut part which concerns on the 21st Embodiment of this invention. It is explanatory drawing of the surface which does not become an undercut part of the product shape which concerns on the 21st Embodiment of this invention. It is a parting line extraction flowchart according to the twenty-second embodiment of the present invention. It is the figure of the product shape seen from the perspective view and the mold opening direction of the product shape which concerns on 22nd Embodiment of this invention. It is a figure which shows the example of a display of the display at the time of the parting line extraction which concerns on the 22nd Embodiment of this invention. It is a creation flowchart (the 1) of the parting surface based on the 23rd Embodiment of this invention. It is a creation flowchart (the 2) of the parting surface based on the 23rd Embodiment of this invention. It is FIG. (1) explaining the parting line and surface element at the time of preparation of the parting surface based on the 23rd Embodiment of this invention. It is FIG. (2) explaining the parting line and surface element at the time of creation of the parting surface based on the 23rd Embodiment of this invention. It is a design flowchart of the ejector pin which concerns on 24th Embodiment of this invention. It is FIG. (1) which shows the display screen of the display at the time of design of the ejector pin which concerns on 24th Embodiment of this invention. It is FIG. (2) which shows the display screen of the display at the time of design of the ejector pin based on 24th Embodiment of this invention. It is a figure which shows the display flowchart of the display at the time of the design flowchart of the mold base which concerns on 25th Embodiment of this invention, and its design. It is a figure which shows the injection shaping die apparatus at the time of the mold base design based on 25th Embodiment of this invention. It is a flowchart explaining the usage method of the configuration file based on the 26th Embodiment of this invention. It is a figure explaining the contents of the configuration file based on the 26th Embodiment of this invention. It is a mold design flowchart in consideration of attributes in the mold design system according to the twenty-seventh embodiment of the present invention. It is the figure which gave the attribute to the name of each part of the injection shaping die apparatus which concerns on the 27th Embodiment of this invention. It is a design flowchart of the hole part of the mold component which concerns on the 28th Embodiment of this invention. It is a figure explaining the interference of the cooling water channel and ejector pin hole which concern on the 28th Embodiment of this invention. It is a design flowchart of the manufacturing tool of the die components based on the 29th Embodiment of this invention. It is FIG. (1) which shows the display screen of the display at the time of design of the manufacturing tool which concerns on 29th Embodiment of this invention. It is FIG. (2) which shows the display screen of the display at the time of design of the manufacturing tool which concerns on 29th Embodiment of this invention. It is a figure explaining the design method of the injection mold which concerns on a prior art example.

Explanation of symbols

  1, 26, 27, 28, 46 ... Product (product shape, molded product), 1A ... rib, 1B ... boss, 1C, 2, 26C ... undercut (hole), 1D ... fillet, 3 ... cavity, 3A, 32 ... fixed side template (cavity plate), 4 ... core, 4A, 33 ... movable side template (core plate), 5 ... runner stripper plate, 6 ... gate, 7 ... resin, 8 ... gas vent, 9 ... cooling path, DESCRIPTION OF SYMBOLS 10 ... Extrusion part, 11 ... Design data memory, 12 ... Database memory, 13 ... Work memory, 14 ... Product shape correction editor, 15 ... Cavity design editor, 16 ... Plate design editor, 17 ... Keyboard, 18 ... CPU, 19 ... Display, 20 ... Printer, 21 ... Other memory, 22 ... Mold design item, 23 ... Product shape correction item, 24 ... Mold part design item, 25 ... Manufacturing model 26A ... first eaves shape, 26B ... second eaves shape, 31 ... fixed side mounting plate, 34 ... receiving plate, 35 ... spacer block, 36 ... upper ejector plate, 37 ... lower ejector plate, 38 ... movable side mounting plate, 39 ... fixed side block (cavity block), 30, 40 ... movable side block (core block), 41 ... parting line creation unit, 42 ... draft gradient imparting unit, 43 ... shrinkage rate correction unit, 44 ... Cooling water channel, 47 ... Electrode for electric discharge machining, 51 ... Cavity / core division part, 52 ... Mold division part, 501 ... Slide division part, 502 ... Nesting preparation part, 61 ... Mold base arrangement part, 62 ... Gate design section, 63 ... Runner design section, 64 ... Sprue design section, 65 ... Gas vent design section, 66 ... Ejector pin design section, 67 ... Temperature control structure design section, 68 ... Movable structure Construction design part 29,100 ... mold block, 100A ... hollow part to be molded product, 200 ... parting surface, 100B ... parting line candidate, 100C ... mold deepest part, 100D ... part that changes rapidly, 100E ... branch 101, plate, 102, 203 ... through hole (counterbore hole), 103, 205 ... screw, 104, 204 ... screw hole, 201 ... block, 202, 208 ... nested, 206 ... block, 207 ... opening, 209 ... Brim, 301 ... Gate, 302 ... Runner, 303 ... Ejector pin hole, 304 ... Gas vent, 305 ... Void, 45, 306 ... Ejector pin, 307 ... Arimizo, 308 ... Cooling pipe, 401 ... Fixed side mounting plate, 402 …Link.

Claims (13)

A correction step, wherein the control means corrects the product shape to a shape that can be punched while displaying the product shape or the mold shape on the screen;
The control means arranges the corrected product shape in a mold block displayed on the screen, and provides a cavity corresponding to the product shape in the mold block, and then divides the mold block into a core and a cavity. Splitting steps to
The control means displays the flow analysis result of the mold resin on the perspective view of the mold viewed from the mold opening direction, and extracts the gas from the flow analysis result to the position where the resin finally arrives. Arranging a gas bend of
In the correction step, the control means obtains a normal vector of the surface of the product shape and a reference vector of the mold opening direction,
A method for designing an injection mold, comprising a step of detecting an undercut portion by detecting a normal vector opposite to the reference vector.   The control means further includes a step of disposing an ejector pin that pushes out a molded product from the mold at a position where the resin finally reaches from the flow analysis result, and providing a gas vent groove on a peripheral surface of the ejector pin. The method for designing an injection mold according to claim 1, further comprising: A step of patterning a plurality of gas vent shapes and dimensions in advance,
The control means further comprises the step of designing the shape and position of the gas vent by an operator specifying the shape and size of the patterned gas vent according to a procedure displayed on a screen. Item 3. A method for designing an injection mold according to Item 1 or 2.   4. The method for designing an injection mold according to claim 3, wherein the control means includes a step of determining a dimension of the gas vent according to a viscosity of a resin material applied to the mold. In advance, as the structure of the dividing surface of the mold, the step of patterning the inlay structure, the plane pressing structure and the positioning pressing structure,
The method for designing an injection mold according to any one of claims 1 to 4, further comprising a step of causing an operator to select the patterned structure according to a procedure displayed on a screen. . A step of registering the structure of the fixed part of the mold in a plurality of patterns in advance,
6. The injection mold according to claim 1, further comprising a step of causing an operator to select a structure of the patterned fixed part according to a procedure displayed on a screen. Design method. A step of registering a plurality of patterns of runners for introducing resin into the mold in advance,
The injection mold according to any one of claims 1 to 6, further comprising a step of causing an operator to select a structure of the patterned runner according to a procedure displayed on a screen. Design method. A step of registering a plurality of patterns of the gate structure of the mold in advance,
The injection mold according to any one of claims 1 to 7, further comprising a step of causing an operator to select the structure of the patterned gate according to a procedure displayed on a screen. Design method. A step of registering a plurality of patterns of ejector pins in advance,
9. The injection mold according to claim 1, further comprising a step of causing an operator to select the structure of the patterned ejector pin according to a procedure displayed on a screen. Design method. A step of registering a plurality of patterns of the cooling path structure of the mold in advance;
The injection mold according to any one of claims 1 to 9, further comprising a step of causing an operator to select a structure of the patterned cooling path according to a procedure displayed on a screen. Design method. A step of registering a plurality of patterns of mold link structures in advance,
The injection mold design according to any one of claims 1 to 10, further comprising: allowing an operator to select the patterned link structure according to a procedure displayed on a screen. Method.   The injection mold according to any one of claims 1 to 11, wherein the control means corrects a one-sided tolerance defined for a part of the mold to a center tolerance and displays it on the screen. Design method.   The injection according to any one of claims 1 to 12, wherein the control means corrects a center tolerance of a dimension defined for a part of the mold to a correction direction tolerance and displays it on the screen. Molding mold design method.

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