JP2006240183A - Method and apparatus for fabricating mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To standardize designing a mold, shorten the lead time for designing the mold and achieve cost reduction. <P>SOLUTION: The method comprises the steps of: inputting the three-dimensional shape data of a molded product 10 into a shape data processing computer 3 and determining the outside dimensions of a mold cavity 16 with the shrinkage ratio of a molding material taken into consideration; setting the parting line La out of parting line candidates La, Lb displayed on the three-dimensional shape date of the molded product 10; setting the parting plane P based on the parting line La on the three-dimensional shape data of the molded product 10; working up the three-dimensional shape data X, Y, Z of the whole mold; dividing the whole mold, by using the parting plane P as the boundary plane, into the three-dimensional shape data of a fixed mold 13 and a movable mold 14; and dividing the fixed mold 13 and the movable mold 14 into the three-dimensional shape data of a plurality of mold components 13a, 14a, etc. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold creation method and apparatus, and more particularly, to a mold creation method and apparatus for designing a mold for manufacturing a molded product from three-dimensional shape data of the molded product defined by XYZ coordinate axes.

When designing a mold, a parting line for the molded product is set, and the dividing surface of the mold is obtained based on this parting line. However, as a mold design method for obtaining a conventional parting line for a mold, For example, the technique disclosed in Patent Document 1 is known. According to this Patent Document 1, all the faces constituting the molded product model are taken out, the normal directions of all the faces are obtained, and if the normal Z direction is positive, the set S + is negative. If there is, set S-, and if not, class S0. Next, of the faces belonging to the set S0, a face having the same edge as the face belonging to the set S− is searched for, and this is moved to the set S− and the rest is moved to the set S +. Further, the boundary between the surface belonging to the set S− and the surface belonging to the set S + was obtained and used as a parting line for the molded product.
JP 11-272720 A (page 2-3, FIG. 5)

  However, in the above-described conventional technique, all the surfaces constituting the molded product model are extracted, the normal directions of all the surfaces are obtained, and the parting lines are divided into a plurality of groups based on the normal directions. It was necessary to perform complicated calculation work.

The present invention has been made to solve such a problem, and the object of the present invention is to provide a mold that can generalize mold design, shorten mold design lead time, and reduce mold manufacturing cost. It is to provide a creation method and apparatus.

In order to achieve the above object, the invention according to claim 1 is a process of inputting the three-dimensional shape data of the molded product to the shape data processing computer and determining the outer dimension of the mold cavity in consideration of the shrinkage rate of the molding material. When,
Displaying a plurality of parting line candidate lines on the three-dimensional shape data of the molded article, and setting a parting line from among the plurality of displayed parting line candidate lines;
Setting a parting surface based on the parting line on the three-dimensional shape data of the molded product;
Determining the dimensions of the entire mold and creating three-dimensional shape data of the entire mold;
Dividing the entire mold into three-dimensional shape data of a fixed mold and a movable mold using the parting surface as a boundary surface;
Dividing the fixed mold and the movable mold into three-dimensional shape data of a plurality of mold parts,
It is characterized by having.

The invention according to claim 2 is a step of inputting the three-dimensional shape data of the molded product to a shape data processing computer and determining the outer dimension of the mold cavity in consideration of the shrinkage rate of the molding material;
Displaying a plurality of parting line candidate lines on the three-dimensional shape data of the molded article, and setting a parting line from among the plurality of displayed parting line candidate lines;
Setting a parting surface based on the parting line on the three-dimensional shape data of the molded product;
Determining the dimensions of the entire mold and creating three-dimensional shape data of the entire mold;
Dividing the entire mold into three-dimensional shape data of a fixed mold and a movable mold using the parting surface as a boundary surface;
Dividing the fixed mold and the movable mold into three-dimensional shape data of a plurality of mold parts,
Checking whether or not there is no interference through the mold parts by causing the plurality of divided mold parts to perform substantially the same operation as in actual molding by an animation function;
It is characterized by having.

  According to a third aspect of the present invention, in the mold making method according to the first or second aspect, in the step of setting the parting line, the plurality of edges of the three-dimensional shape data of the molded product It is displayed as a line candidate line, and at least one parting line candidate line is selected from the plurality of parting line candidate lines.

  According to a fourth aspect of the present invention, in the mold making method according to any one of the first to third aspects, the step of setting the parting line includes the step of selecting the parting line candidate line when the parting line candidate line is selected. The display of other parting line candidate lines that do not exist simultaneously with respect to the parting line candidate lines selected within the same plane of the three-dimensional shape data is erased.

  According to a fifth aspect of the present invention, in the mold making method according to any one of the first to fourth aspects, the step of setting the parting line is formed by connecting some of the parting line candidate lines. It is characterized by obtaining a closed curve.

  According to a sixth aspect of the present invention, in the mold making method according to any one of the first to fifth aspects, the step of setting the parting line includes the parting line candidate on a surface substantially perpendicular to the mold opening direction. When a line is projected, a warning is displayed if it intersects itself.

  The invention according to claim 7 is the mold making method according to any one of claims 1 to 6, wherein the step of setting the parting line is an end point on the terminal side of the already selected parting line candidate line If a plurality of parting line candidate lines that have not yet been selected are displayed to be connectable, among the plurality of parting line candidate lines, Z is selected with respect to the end points of the parting line candidate lines that have already been selected. A parting line candidate line with little movement in the axial direction is selected.

  According to an eighth aspect of the present invention, in the mold making method according to any one of the first to sixth aspects, the step of setting the parting line is performed at an end point on the terminal side of the already selected parting line candidate line. When there is no other parting line candidate line, the already selected parting line candidate line is extended in the extension direction as it is, and the extension line is projected onto the specified surface on the three-dimensional shape data of the molded product It is characterized by being performed.

  The invention according to claim 9 is the mold making method according to any one of claims 1 to 6, wherein the step of setting the parting line is performed at an end point on the terminal side of the selected parting line candidate line. When there is no other parting line candidate line, the already selected parting line candidate line is extended in the extension direction as it is, and the extension line is projected onto a surface continuously connected to the surface where the end point exists. It is characterized by performing.

  A tenth aspect of the present invention is the mold making method according to any one of the first to sixth aspects, wherein the step of setting the parting line is a terminal side of the two parting line candidate lines that are not connected to each other. When there is no parting line candidate line connecting the end points at each end point, the straight line connecting the end points is projected onto a specified surface on the three-dimensional shape data of the molded product. Features.

  The invention according to an eleventh aspect is the mold making method according to any one of the first to tenth aspects, wherein the step of setting the parting surface has a hole formed in the molded product. In the case of being set based on the parting line of the inner shape portion and composed of one surface, the one surface is set as a parting surface.

  The invention according to claim 12 is the mold making method according to any one of claims 1 to 10, wherein the step of setting the parting surface has a hole formed in the molded product. If the parting line is set based on the parting line formed on the inner shape part and is composed of a plurality of surfaces, one parting surface is first set from one surface by ruled action, and then adjacent A parting surface is sequentially set by a ruled action from the surface and the parting line.

  The invention according to claim 13 is the mold making method according to any one of claims 1 to 10, wherein the step of setting the parting surface has a hole formed in the molded product. When the parting line is set based on the parting line formed on the inner shape part and is composed of a plurality of surfaces, first, one parting surface is set by ruled action from one surface, and then another parting surface is set. When setting the parting surface, if the ratio of the length of one parting line and the sum of the lengths of the plurality of parting lines facing it is equal to or greater than a predetermined value, the plurality of parting lines are The ruled act is performed by adjusting the length of the connected parting lines in a predetermined direction and the length of the one parting line to be substantially the same. And sets a more new parting surface.

  According to a fourteenth aspect of the present invention, in the mold making method according to any one of the first to thirteenth aspects, in the step of setting the parting surface, one parting surface is set by ruled action, and then another parting surface is set. When setting a parting surface, if the parting line that is not used to create the other parting surface remains, an alarm is displayed to that effect.

  According to a fifteenth aspect of the present invention, in the mold making method according to the fourteenth aspect, in the step of setting the parting surface, one parting surface is set by a ruled action, and then another parting surface is set. When the parting line that is not used to create the other parting surface remains, the remaining parting line is connected to the end line of the other parting surface. A special parting surface is created.

  The invention according to claim 16 is the mold making method according to any one of claims 1 to 10, wherein the step of setting the parting surface is the part of the outer shape portion of the molded product. In the case of setting from a single line and consisting of one surface, the one surface is used as a parting surface.

  The invention according to claim 17 is the mold making method according to any one of claims 1 to 10, wherein the step of setting the parting surface is the part of the outer shape portion of the molded product. If there are multiple surfaces, set one surface as the basic parting surface, and then add a new parting to another surface substantially parallel to the one surface. It is characterized by setting a surface.

  According to an eighteenth aspect of the present invention, in the mold making method according to the seventeenth aspect, the step of setting the basic parting surface is set on a surface that is substantially perpendicular to the mold opening direction. To do.

  According to a nineteenth aspect of the present invention, in the mold making method according to the seventeenth aspect, in the step of setting the parting surface, when a plurality of parting surfaces are self-intersecting, a warning is displayed. It is characterized by that.

  According to a twentieth aspect of the present invention, in the mold making method according to the second aspect, the checking step causes the plurality of disassembled mold parts to perform an operation similar to that at the time of actual molding by an animation function. It is characterized in that it is checked whether or not there is a logical product of mold part data, and if there is, an alarm is issued.

A mold creating device as an invention according to claim 21 is an input device for inputting data necessary for mold design;
A shape data processing computer capable of calculating the three-dimensional shape data of the molded product defined by the XYZ coordinate axes based on the data input from the input device and creating a parting line and a parting surface of the mold;
And a display device for displaying a result of processing by the shape data processing computer.

  According to the present invention, an input device for inputting data necessary for mold design, and a three-dimensional shape data of a molded product defined by XYZ coordinate axes based on the data input from the input device are arithmetically processed. A long time has been required so far by including a shape data processing computer capable of creating a parting line and a parting surface of a mold and a display device for displaying a processing result by the shape data processing computer. The man-hours for mold design can be greatly reduced. Further, for example, even an operator with poor mold design knowledge can perform mold design only by learning basic CAD operations.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a control block diagram of a mold making apparatus according to the present invention. In the figure, a mold creating apparatus 1 includes an input apparatus 2 for inputting data necessary for designing a mold by a designer, and a control for performing processing based on data input from the input apparatus 2 and the like. A computer 3 and a display device 4 for displaying the processing results in the control computer 3 are provided. The control computer 3 performs a calculation process based on the data input from the input device 2, and a three-dimensional shape data processing unit 5 capable of creating a parting line and a parting surface of the mold, and a three-dimensional shape data process It has a built-in storage device 6 for storing results generated in the process of the unit 5 performing arithmetic processing. The three-dimensional shape data processing unit 5 incorporates a program relating to the mold creation method of the present embodiment. A mold designer (operator) uses the input device 2 to design the shape of the molded product and the shape of the mold using three-dimensional CAD (computer aided design).
[Flow of basic process of mold design by 3D CAD]
FIG. 2 is a diagram showing a control flowchart of the mold making method according to the present invention.

  First, in step (hereinafter referred to as “S”) 1, three-dimensional shape data of the molded product 10 is created. That is, as shown in FIG. 3, three-dimensional shape data relating to the molded product 10 defined by the XY coordinate axes is prepared, and this three-dimensional shape data is input to the control computer 3. This molded product 10 has a notch hole 15 at one corner, and has a casing shape in which an opening 11 having a substantially rectangular cross section is formed, as shown in FIG.

  Next, in S2, the enlarged data in anticipation of the shrinkage rate is placed on the mold creation software. That is, data obtained by multiplying the three-dimensional shape data of the molded product 10 in consideration of the shrinkage rate of the molding material (synthetic resin, etc.) is input to the mold creation program, and the size of the mold cavity 16 (see FIG. 8) is set. decide. This is because, for example, when the molded article 10 is made of a synthetic resin, the synthetic resin shrinks when cooled from a molten state, so that a mold cavity having a size (outside dimension) commensurate with the shrinkage rate is made. .

  Next, in S3 and S4, a parting line is set on the three-dimensional shape data of the molded product 10. At this time, the edge of the maximum outer shape of the molded product 10 is displayed as a candidate line for the parting line. That is, as a parting line candidate line, a plurality of edges (ridge lines) of the three-dimensional shape data are extracted as candidate lines, and an operator selects an appropriate candidate line from these. For example, in FIG. 3 described above, one of the edge La connecting the lowest corners T1 and T2 and the edge Lb connecting the uppermost corners T3 and T4 is selected from the three-dimensional shape data of the molded product 10. . In the present embodiment, it is assumed that the operator selects the edge La connecting the lowest corners T1 and T2 as a parting line (S5).

  As shown in FIG. 5, when the parting line candidate line L is projected onto the parting plane P that is substantially perpendicular to the mold opening direction, the parting line candidate line L self-intersects as shown in part A. In the case, an alarm is displayed. Further, as shown in FIG. 6, in the case where the molded product 10 has a tapered outer shape in the mold opening direction, the parting line candidate lines La ′ and Lb ′ are parted substantially perpendicular to the mold opening direction. When projected onto the surface P, the parting line candidate line La ′ that becomes the outermost shape is selected.

  Next, in S6 to S9, a parting surface is set based on the parting line La. At this time, when the parting line La is set, the parting surface is automatically created. That is, in FIG. 3, since the parting line La is in the XY plane, the plane (T1-T2-T5-T6) including the parting line La is automatically selected as the parting plane P. Note that, for example, the operator may manually select edges including the corner portions T5 and T6 in a plane including the parting line La.

  Next, the dimension of the whole metal mold | die is determined in S10. For example, in FIGS. 7 and 8, the entire three-dimensional shape dimensions (X, Y, Z axes) of the mold (upper mold 13 (including the core 13 c) and lower mold 14) 12 for molding the molded product 10. Direction dimension) is determined, and three-dimensional shape data (X dimension, Y dimension, Z dimension) of the entire mold 12 is created.

  Next, in S11, the parting surface P is used as a boundary surface, and the data is divided into data (X, Y, Z1) and (X, Y, Z2) of the respective shape dimensions of the upper mold 13 and the lower mold 14. In this embodiment, the X and Y dimensions of the upper mold 13 and the lower mold 14 are common.

  Next, in S12, another mold part is created by dividing (separating) the upper mold 13 and the lower mold 14 from each other. For example, in FIG. 9, the upper mold 13 and the lower mold 14 are each divided into a plurality of mold parts. Here, the upper mold 13 is divided into three parts, that is, a fixed mold 13a and two cores 13b and 13c, and the lower mold 14 is one of the movable molds 14a.

  Next, in S13 and S14, the four mold parts 13a, 13b, 13c, and 14a of the upper mold 13 and the lower mold 14 divided as described above are operated at the time of actual molding by the animation function. It is checked whether there is any interference through these four mold parts 13a, 13b, 13c, 14a.

Hereinafter, the setting method of a parting line and the setting method of a parting surface are demonstrated concretely.
[Parting line settings]
The program according to the present embodiment has a semi-automatic setting function including an operator's selection action when setting a parting line. Here, the molded product shown in FIGS. 10A to 10C will be described as an example.

  First, in FIG. 10A, six edges L1 to L6 are extracted from the three-dimensional shape data of the molded product as parting line candidate lines, and these six edges L1 to L6 are displayed as candidate lines. The operator selects one or a plurality of candidate lines from among the candidate lines L1 to L6, and then selects an “automatic” command from the commands displayed on the display screen of the display device 4, thereby Other candidate lines that pass through the selected candidate line are automatically determined to determine a continuous parting line. For example, if the operator designates candidate lines L5 and L6 in FIG. 10B, the parting line L5-ab-L6 is determined as shown in FIG. 10C. However, the operator may sequentially select all candidate lines manually without selecting “automatic” to create a continuous parting line. In order to make it easier for the operator to identify candidate lines, for example, the color of candidate lines may be initially displayed in yellow or the like, and may be changed to green or the like after being selected and confirmed.

  Furthermore, in the present embodiment, other candidate lines that do not exist at the same time are not displayed for candidate lines selected within the same plane of the three-dimensional shape data of the molded product, and one candidate line is displayed. Each time a selection is made, the other candidate lines are erased. This is because an unnecessary candidate line remains, which prevents a quick operation. For example, in FIG. 11A, if the operator selects the candidate line L5, there cannot be a candidate line that exists at the same time as the candidate line L5 in the same plane in the Z-axis direction. The display of L4 is erased.

  Similarly, in FIG. 10B described above, since there cannot be a plurality of parting lines parallel to the Z-axis direction within the same plane of the three-dimensional shape data, one candidate line L7 in the Z-axis direction is selected. Then, the display of the other candidate line L8 parallel to it is deleted. In FIG. 3 described above, the parting surface P is a surface formed including a closed curve formed by connecting corners (T1-T2-T6-T5) of the edge La selected by the operator as a candidate line. .

  Further, in the present embodiment, when a plurality of candidate lines that have not yet been selected are displayed at the end points on the terminal side of the already selected candidate lines, that is, in FIG. In a state where one candidate line L5 is considered to branch in the direction of a plurality of candidate lines (ce or cd) at an end point c on the terminal side, the plurality of candidate lines (ce or cd) Among these, the candidate line ce that moves little in the Z-axis direction with respect to the end point c of the already selected candidate line L5 is selected. In FIG. 12A, when there is no other candidate line (or the edge of the molded product) at the end point f on the terminal side of the already selected candidate line L9, as shown in FIG. 12B, the already selected candidate line L9 Is extended in the extension direction, and a line L10 obtained by projecting the extension line onto the surface F1 designated on the three-dimensional shape data of the molded product by the operator is defined as a parting line.

Next, as shown in FIGS. 13A to 13C, candidate lines (or edges of the molded product) connecting the end points g and h to the end points g and h on the terminal side of the two candidate lines L11 and L12 that are not connected to each other. ) Does not exist, the straight line L13 ′ connecting the end points g and h to the surfaces (or surfaces interposed between the parting lines) F2, F3, and F4 specified on the three-dimensional shape data of the molded product. The projected straight line L13 is defined as a parting line. In this case, a straight line L13 ′ is projected onto the surfaces F2, F3, and F4 that are continuously connected to the surface where the end points g and h exist to form a parting line, and the surface that does not continue to the surface where the end points g and h exist ( The straight line L13 ′ is not projected on the not shown.
[Parting surface settings]
Next, in the program of the present embodiment, a parting surface is created by parallel sweeping (also referred to as “extrusion”, which is a method of drawing an arbitrary planar shape into a three-dimensional shape) from a set parting line, It has a function of creating a parting surface by an act (an act of connecting two lines).

  For example, in FIG. 14, the parting surface is a case where the parting surface is set from parting lines L14 to L17 formed in an inner shape portion in which a hole 21 is formed in the molded product 20, and is composed of one surface (surface). In this case, the one surface is set as the parting surface P2.

  For example, in FIG. 15, when the parting surface is set from the parting lines L18 to L27 formed in the inner shape portion in which the hole 31 is formed in the molded product 30, and is composed of a plurality of surfaces, The operator first sets the parting surface P3 from one surface (the surface including L20 and L26) using the ruled function, and then the surface (surface consisting of XZ) and the parting adjacent to the parting surface P3. Lines L19 and L26 (extending in the Z-axis direction) and parting lines L21 and L24 (extending in the Z-axis direction) are connected by the ruled function to set the parting surfaces (P4 and P5). . Hereinafter, similarly, the surfaces including the parting lines L22 and L27 are set as the parting surfaces.

  In this case, for example, in FIG. 16, when connecting the two parting lines L ′ and the parting line L ″ with the ruled function, there is no problem if they are normally connected as shown in FIG. As described above, care should be taken so that the surfaces connected by the ruled function do not cause a “twisted relationship”.

  Further, in FIG. 18, the parting surface is set from parting lines L28 to L33 formed in the inner shape part in which the hole 41 is formed in the molded product 40, and is formed of a plurality of surfaces (P6). , P7, and P8 are different surfaces), a parting surface P6 set by the operator with the ruled function and a parting surface P7 that is automatically selected, for example, are set, but the opposing parting line L28 and a plurality of parting surfaces When the line (L29 to L33) exceeds a preset length ratio (for example, 3 times), the parting lines L29 to L33 are connected using a connecting function, and one parting line It is considered. Then, adjust the length of the parting lines (L29 to L33) regarded as one parting line in the direction of the parting line L28 and the length of the opposing parting line L28 to be substantially the same, The parting line L28 and the parting lines (L29 to L33) are connected by the ruled function to set a new parting surface P8. This point is similar to the case where the parting surface is set in the B part of FIG. 15 described above.

  Similarly, in FIG. 19, when the parting surface is set from the parting lines L34, L35, etc. formed in the inner shape part in which the hole 51 is formed in the molded product 50, first, the parting line facing the operator is first set. L34 and L35 are connected by the ruled function to set the parting surface P9, and then, for example, the automatically selected parting surface P10 is set, but it is used to create the parting surface P10. When the parting line L36 that has not been left remains, a message to that effect (“parting line L36 is left” or the like) is displayed on the display device 4. In this case, the parting surface P11 is created by connecting the remaining parting line L36 and the end line i of the adjacent parting surface P10.

  Next, as shown in FIG. 20, when the parting surface (P12) is set from the parting lines L37 to L40 of the outer shape portion of the molded article 10, and the parting surface (P12) is 1 In the case of two surfaces, one surface including the parting lines L37 to L40 is the parting surface P12.

  21A and 21B, the parting surface is set from the parting lines L41 to L47 of the outer shape portion of the molded product 60 having the U-shaped notch 61, and the parting lines L41 to L47 When the surface formed including L47 is composed of a plurality of surfaces P13 to P16, one surface including the parting lines L41 to L47 is set as the basic parting surface P13, and then this basic parting surface P13 The parting surface P14 is set on another surface (surface passing through the upper end in the Z-axis direction of the parting lines L45 and 46) substantially parallel to the surface. In this case, the basic parting surface P13 set as the basic parting surface is set as a surface that is substantially perpendicular to the mold opening direction, and there are a plurality of surfaces that are substantially perpendicular to the mold opening direction. In this case, when a parting surface (not shown) passing through the parting line L47 is compared with the parting surface P13, a parting surface having a large area is set as a basic parting surface. Further, the parting surfaces P15 and P16 passing through the parting lines L45 and L46 and substantially parallel to the YZ plane can be created by sweeping the parting lines L45 and L46 in parallel in the Y-axis direction (FIG. 21A). reference).

However, in FIG. 21A, if the created parting surfaces P15 and P16 self-intersect, this is displayed on the display device 4. That is, in FIG. 21A, when the parting surfaces P15 and P16 are to be created by parallel sweeping, if the parting surfaces P15 and P16 are swept in parallel in the X-axis direction, the parting surfaces P15 and P16 self-intersect. In this case, an error message appears.
[Check process]
Next, the check process will be briefly described. In the check process after the data of the fixed mold 13 and the movable mold 14 and each part are automatically created from the parting surface, the mold parts divided into a plurality of parts are operated at the time of actual molding by the animation function. Check if there is a logical product of mold part data. That is, a plurality of mold parts are operated at the time of actual molding, whether or not there is a logical product of the mold part data is checked, and if necessary, this is dealt with by changing the order of removing the molds.

For example, in the case of the mold shown in FIG. 9 described above, the core 13c is first extracted in the left direction (−X-axis direction) with respect to the core 13b held by the fixed side mold plate 13a, and then the next. The movable side mold plate 14a is moved downward (-Z-axis direction) in the figure, and further (after the molded product is taken out), the fixed side core 13b is moved downward (- At this time, if there is no logical product of the mold part data, it is OK, and if inconvenience occurs, it is dealt with by changing the order of removing the mold.
[Create split core]
Basically, it is designed so that when each mold part is pulled out in the specified direction without interfering with the finished product or other split cores, a so-called check function has been added. Then, the description is omitted.

It is a control block diagram of the metal mold | die preparation apparatus which concerns on this invention. It is a figure which shows the control flowchart of the metal mold | die preparation method concerning this invention. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows the state which turned the molded product same as the above upside down. It is a figure which shows the state which the parting line self-crossed. It is a front view of the molded product which has a taper shape in the mold opening direction. It is a figure which shows the state which separated and arrange | positioned the upper mold | type and the lower mold | type. It is sectional drawing which shows the state which contact | abutted and arrange | positioned the upper mold | type and the lower mold | type. It is a disassembled perspective view of an upper mold and a lower mold. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows a part of three-dimensional shape data of a molded article. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows the state which connected two parting lines normally by the ruled function. It is a figure which shows the state which connected the two parting lines so that a twist relationship might arise by a ruled function. It is a partial top view of a molded product. It is a partial top view of a molded product. It is a figure which shows the three-dimensional shape data of a molded article. It is a figure which shows the relationship between a molded article and a parting surface. It is a figure which shows the parting surface same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold production apparatus 2 Input apparatus 3 Control computer 4 Display apparatus 5 Three-dimensional shape data processing part 6 Storage part 10 Molded article 11 Opening part 12 Mold 13 Upper mold 13a Fixed side mold plate 13b Core 13c Core 14 Lower mold 14a Movable side template 14b Core 16 Cavities L1, L2, ... Parting line candidate lines P, P1, P2, ... Parting surfaces T1, T2, ... Corners

Claims (21)

Inputting the three-dimensional shape data of the molded product into a shape data processing computer and determining the outer dimensions of the mold cavity in consideration of the shrinkage rate of the molding material;
Displaying a plurality of parting line candidate lines on the three-dimensional shape data of the molded article, and setting a parting line from among the plurality of displayed parting line candidate lines;
Setting a parting surface based on the parting line on the three-dimensional shape data of the molded product;
Determining the dimensions of the entire mold and creating three-dimensional shape data of the entire mold;
Dividing the entire mold into three-dimensional shape data of a fixed mold and a movable mold using the parting surface as a boundary surface;
Dividing the fixed mold and the movable mold into three-dimensional shape data of a plurality of mold parts,
A mold making method characterized by comprising: Inputting the three-dimensional shape data of the molded product into a shape data processing computer and determining the outer dimensions of the mold cavity in consideration of the shrinkage rate of the molding material;
Displaying a plurality of parting line candidate lines on the three-dimensional shape data of the molded article, and setting a parting line from among the plurality of displayed parting line candidate lines;
Setting a parting surface based on the parting line on the three-dimensional shape data of the molded product;
Determining the dimensions of the entire mold and creating three-dimensional shape data of the entire mold;
Dividing the entire mold into three-dimensional shape data of a fixed mold and a movable mold using the parting surface as a boundary surface;
Dividing the fixed mold and the movable mold into three-dimensional shape data of a plurality of mold parts,
Checking whether or not there is no interference through the mold parts by causing the plurality of divided mold parts to perform substantially the same operation as in actual molding by an animation function;
A mold making method characterized by comprising:   The step of setting the parting line includes displaying a plurality of edges of the three-dimensional shape data of the molded product as the plurality of parting line candidate lines, and at least one party among the plurality of parting line candidate lines. The method for producing a mold according to claim 1, wherein a mold candidate line is selected and performed.   The step of setting the parting line simultaneously exists for the parting line candidate lines selected in the same plane of the three-dimensional shape data of the molded product when the parting line candidate lines are selected. 4. The mold making method according to claim 1, wherein the display of other parting line candidate lines having no gap is erased.   The mold creation according to any one of claims 1 to 4, wherein the step of setting the parting line is to obtain a closed curve formed by connecting some of the parting line candidate lines. Method.   The step of setting the parting line is characterized in that when the parting line candidate line is projected on a surface substantially perpendicular to the mold opening direction, a warning is displayed when the parting line is self-intersecting. The mold making method as described in any one of.   In the step of setting the parting line, when a plurality of parting line candidate lines that have not yet been selected are displayed at the end points on the terminal side of the parting line candidate line that has already been selected, 7. The parting line candidate line having a small movement in the Z-axis direction with respect to an end point of the already selected parting line candidate line is selected from a plurality of parting line candidate lines. A mold making method according to any one of the above.   In the step of setting the parting line, if there is no other parting line candidate line at an end point on the terminal side of the already selected parting line candidate line, the already selected parting line candidate line is expanded. 7. The method for producing a mold according to claim 1, wherein the extension line is extended as it is, and the extension line is projected onto a surface designated on the three-dimensional shape data of the molded product.   In the step of setting the parting line, if there is no other parting line candidate line at an end point on the terminal side of the already selected parting line candidate line, the already selected parting line candidate line is expanded. 7. The method for producing a mold according to claim 1, wherein the extension line is extended as it is, and the extension line is projected onto a surface continuously connected to the surface where the end points exist.   In the step of setting the parting line, if there is no parting line candidate line connecting the end points at the end points of the two unconnected parting line candidate lines, the end points are 7. The mold creation method according to claim 1, wherein the tied straight line is projected onto a surface designated on the three-dimensional shape data of the molded product.   The step of setting the parting surface is a case where the parting surface is set based on the parting line of the inner shape portion having a hole formed in the molded article, and is composed of one surface. In this case, the mold creating method according to any one of claims 1 to 10, wherein the one surface is set as a parting surface.   The step of setting the parting surface is a case where the parting surface is set based on the parting line formed in an inner shape portion having a hole formed in the molded article, and a plurality of the parting surfaces are set. In the case of comprising a surface, first, one parting surface is set by ruled action from one surface, and then parting surfaces are sequentially set by ruled action from adjacent surfaces and the parting line. Item 11. A mold making method according to any one of Items 1 to 10.   The step of setting the parting surface is a case where the parting surface is set based on the parting line formed in an inner shape portion having a hole formed in the molded article, and a plurality of the parting surfaces are set. When it consists of surfaces, when setting one parting surface by ruled action from one surface first and then setting another parting surface, the length of one parting line and multiple parting facing it When the ratio of the sum of the lengths of the lines is equal to or greater than a predetermined value, the plurality of parting lines are connected, the length of the connected parting lines in a predetermined direction, and the length of the one parting line 11 is adjusted so as to be substantially the same, and a new parting surface is set by a ruled action. Mold how to create a placement.   In the step of setting the parting surface, when one parting surface is set by ruled action and then another parting surface is set, the parting line that is not used to create the other parting surface The method for producing a mold according to any one of claims 1 to 13, wherein a warning is displayed when the mark remains.   In the step of setting the parting surface, when one parting surface is set by ruled action and then another parting surface is set, the parting line that is not used to create the other parting surface 15. The mold according to claim 14, wherein when a part remains, a new parting surface is created by connecting the remaining parting line and an end line of the other parting surface. How to make.   The step of setting the parting surface is a case where the parting surface is set from the parting line of the outer shape portion of the molded article and is composed of one surface. The mold making method according to any one of claims 1 to 10, wherein a mold surface is used.   The step of setting the parting surface is a case where the parting surface is set from the parting line of the outer shape portion of the molded article and is composed of a plurality of surfaces. 11. The mold creation method according to claim 1, wherein a parting surface is set as a parting surface, and then a new parting surface is set on another surface substantially parallel to the one surface.   The method of creating a mold according to claim 17, wherein the step of setting the basic parting surface is set on a surface that is substantially perpendicular to the mold opening direction.   The mold creating method according to claim 17, wherein, in the step of setting the parting surface, if a plurality of parting surfaces self-intersect, an alarm is displayed to that effect.   In the checking step, a plurality of disassembled mold parts are operated by an animation function in the same manner as in actual molding to check whether there is a logical product of the plurality of mold part data. 3. The mold making method according to claim 2, wherein an alarm is issued. An input device for inputting data necessary for mold design;
A shape data processing computer capable of calculating the three-dimensional shape data of the molded product defined by the XYZ coordinate axes based on the data input from the input device and creating a parting line and a parting surface of the mold;
A display device for displaying a processing result by the shape data processing computer;
A mold making apparatus characterized by comprising: