JPH0916657A - Methods for preparing designing data of shape of intermediate structure and tool tracing data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure with machining allowance by a CAD/CAM system and to prepare tool tracing data for working the allowance. SOLUTION: A mold structure 41a provided with machining allowance 95 is prepared from a mold structure 41 provided with finish marks (white inverted triangles). In order to prepare tool trace (tool tracing data) for a tool head 94 and the structure 41a, interference is checked on a screen. In an interference generation state, an operator changes a tool 91 to a longer tool 91a and executes interference check again. Thus the tool tracing data for the mold structure 41a with the machining allowance can be almost automatically prepared.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the final structure when the disappearing mold of the press mold is considered to be the final structure when the press mold is manufactured by casting. The present invention relates to a method of creating intermediate structure shape design data for manufacturing such an intermediate structure by considering a vanishing type with an allowance as an intermediate structure.

The present invention is also directed to the tool trajectory data for obtaining a desired final structure by machining an intermediate structure manufactured by using the intermediate structure shape design data with an NC machine tool. Regarding how to create.

[0003]

2. Description of the Related Art For example, a large-sized steel plate forming member such as an outer plate (side panel outer) of an automobile, which is produced in a relatively large amount, is manufactured by a press die including an upper die and a lower die.

When this press die (upper die and lower die) is to be produced by casting, it is not necessary to pull it out of the die as a die for producing the die, unlike a wooden die. An extinguishing mold made of expanded polystyrene, which is excellent as a prototype, is adopted, and the manufacturing of this extinguishing mold is an essential process.

The prior art of this disappearance type manufacturing process will be described with reference to the overall process drawing of FIG. In this case, first, design data of a press die is created by a known CAD (computer aided design) system (step S1). The mold design data includes data relating to finishing symbols that indicate the finishing state of the surface. Usually, this creation process is performed on the CAD system on the production technology development department side of the automobile manufacturer, for example. Further, the process of step S1 is also simply referred to as mold design.

Next, the design data of the press die created on the CAD system in the die design process of step S1 is an intermediate vanishing type (as the final structure shape design data corresponding to the final vanishing type). It is supplied to an intermediate vanishing type production department (sometimes referred to as a primary production zone) that manufactures the final vanishing type with replacement, and for manufacturing the intermediate vanishing type in this intermediate vanishing type manufacturing department. Intermediate structure shape design data is created (step S2).

[0007] Usually, this intermediate disappearance manufacturing department is a specialized manufacturer different from the automobile manufacturer. The specialized maker, while looking at the design drawing based on the final structure shape design data, uses the CAD system of the specialized maker to respond to the finishing symbol by the original design standard and know-how of the specialized maker. Doing allowance (finishing allowance)
By adding manufacturing conditions such as, the intermediate structure shape design data used only by the specialized manufacturer is created.

With reference to the drawing based on the intermediate structure shape design data created in this way, the final disappearance type with replacement, that is, the intermediate disappearance type is manufactured by the specialized maker side thereof (step S3). ). In the case of the outer plate of the automobile, this production is a work for manually cutting out from a considerably large rectangular parallelepiped having one side of several meters.

The manufactured intermediate disappearance type is delivered from the specialized manufacturer to the production technology development section of the automobile manufacturer, and the production technology development section or the inspection section performs acceptance inspection (step S4). The content of the acceptance inspection was entered in the drawing based on the dimensions of the intermediate disappearance type product delivered (dimensions including the stock removal) and the final structure shape design data created by the production technology development department. It is to confirm the dimensions (dimensions that do not include machining allowance), and visually confirm the appearance of the intermediate disappearance type. In practice, the value of the stock removal of the intermediate structure can be known only to the orderer (the production technology development department) at the stage of this acceptance inspection.

[0010] Next, the machining allowance final structure shape design data obtained by inserting the value of the machining allowance obtained from the intermediate structure that has passed the acceptance inspection into the final structure shape design data by the CAD system is obtained. , Well-known CAM (comput
er aided manufacturing: computer-aided manufacturing) system, and tool locus data for NC machine tools is created on this CAM system. In general, the CAM system and the CAD system have a system configuration in which similar hardware is shared, and data is also shared.

Then, based on the created tool trajectory data, the NC machine tool uses the intermediate structure (specifically,
The final structure (specifically, the final disappearance type) is manufactured by performing the finishing process on the intermediate disappearance type (step S5).

Then, after the operator manually measures the dimensions of the final structure produced by the NC machine tool using a three-dimensional measuring machine or the like, this measured dimension value is the first in the production technology development department. It is checked whether or not the dimensions on the drawing represented by the final structure shape design data created in 1) are met, and the final structure identical to the final structure represented by the final structure shape design data is confirmed. The target structure is completed (step S6).

[0013]

As described above, in the manufacturing process of the vanishing type according to the above-mentioned conventional technique, the department for producing the vanishing type final structure shape design data (for example, the production technology of the above-mentioned automobile manufacturer). Although there is a technical close relationship between the development department) and the department that manufactures the intermediate disappearance type based on the final structure shape design data of the disappearance type (for example, the specialized manufacturer mentioned above). There wasn't.

In other words, generally speaking, manufacturing conditions etc. are added once by using different design criteria on the downstream side based on the final design data of the final structure shape of the object created by a certain design criteria on the upstream side. The intermediate structure
Next, since the intermediate structure is manufactured in the process of being processed into the target final structure again based on the upstream design criteria, various problems as described below have occurred.

First, on the downstream side, when creating design data for manufacturing an intermediate structure, an allowance is manually added, so that there is a high probability that an input error will occur. The intermediate structure itself may be a so-called joint structure, and in this case, there is a problem that it takes time to complete the structure. Further, in such a case, as a result, there is a problem that the manufacturing cost for manufacturing the intermediate structure increases.

Secondly, in the acceptance inspection process of step S4, since it is an inspection that refers to the design data of the intermediate structure and the target final structure created by a certain design standard on the upstream side, for example, It is only possible to determine whether or not the machining allowance is actually attached, and it is not possible to judge whether the amount of the machining allowance or the method of attaching the machining allowance is optimal, for example, from the processing direction. In such a case, there is a problem in that a processing time is longer than necessary in the next processing step performed based on the upstream design standard.

Thirdly, in the machining process of step S5, machining is performed by an NC machine tool.
Even when the machining data of the machine tool is created by the CAM system, the attribute data such as the machining allowance obtained in the acceptance inspection process of step S4 is manually input, which causes a problem that it takes a considerable time. .

Fourthly, in the product inspection process of step S6, the dimension confirmation work measures the dimension of the finally disappeared object by, for example, a three-dimensional measuring machine, and then the measured dimension and the final structure shape design data are used. There is also a problem that the man-hours are enormous because it is a visual work for checking the dimensions in the drawing shown.

After all, in the above-described conventional method of manufacturing an intermediate structure, when a defect occurs in the subsequent steps including the primary manufacturing step of step S2, the subsequent steps are greatly adversely affected. There was a point.

The present invention has been made in consideration of the above problems, and it is possible to easily create intermediate structure shape design data from final structure shape design data of an intermediate structure to be manufactured. It is an object of the present invention to provide a method of creating intermediate structure shape design data that enables the above.

Further, the present invention is an accurate and reliable tool trajectory for obtaining a desired final shape of a structure from an intermediate structure manufactured by using the intermediate structure shape design data. An object of the present invention is to provide a method for creating tool trajectory data that enables easy creation of data.

[0022]

SUMMARY OF THE INVENTION According to the present invention, the shape of an intermediate structure is produced when an intermediate structure is produced and the intermediate structure is machined by an NC machine tool to produce a final structure. In the design data creating method, the CAD system is used to create the shape design data of the final structure instructing the finish state of the surface, and identify the surface of the shape of the final structure that requires processing. , Creating shape design data of the final structure in which a machining allowance is given to the specified surface, and CAM for the final structure in which the machining allowance is given.
It is characterized in that interference confirmation with a tool is performed on the system, and the shape design data of the final structure with the machining allowance that does not interfere with the tool is used as the intermediate structure shape design data.

In this case, it is characterized in that the dimensional tolerance after the machining of the machining allowance is given together with the instruction of the finishing state of the surface on the CAD system.

Further, the finishing state of the surface is specified by a finishing symbol. Further, the structure is a vanishing type for casting.

Further, according to the present invention, in a method for creating tool trajectory data for producing an intermediate structure and machining the intermediate structure with an NC machine tool to produce a final structure, CAD On the system, create the shape design data of the final structure instructing the finish state of the surface, specify the surface that needs processing in the shape surface of the final structure,
Forming the shape design data of the final structure in which a machining allowance is given to the specified surface, and making tool trajectory data as a result of performing interference confirmation on the CAM system for the final structure in which the machining allowance is given, It is characterized in that the tool locus data is created and used as the tool locus data for the NC machine tool.

(Operation) According to the present invention, the shape design data of the final structure in which the machining allowance is given to the specific surface in the shape surface of the final structure for which the finish state of the surface is instructed on the CAD system. Then, the final structure with the machining allowance is checked for interference with the tool on the CAM system, and the shape design data of the final structure with the machining allowance that does not interfere with the tool is used as an intermediate structure shape design. I have data.

Therefore, when the machining allowance in the intermediate structure manufactured based on the intermediate structure shape design data is machined by the NC machine tool, no interference with the tool occurs. In addition, C which created the shape design data of the final structure
Since the AD system creates the shape design data of the final structure in which a machining allowance is given to a specific surface, so-called human error such as dimensional input error when giving the machining allowance is caused. It can be prevented.

In particular, when the intermediate structural member is the vanishing type with the stock removal, the so-called lead time until obtaining the final vanishing type, that is, from the design of the vanishing type to obtaining the actual vanishing type The time can be reduced considerably.

Further, according to the present invention, on the CAD system, the shape design of the final structure in which a margin is given to a specific surface in the shape surface of the final structure instructing the finish state of the surface. Data is created, and tool trajectory data is created as a result of interference confirmation on the CAM system for the final structure with the allowance added, and this tool trajectory data is processed into an intermediate structure with an NC machine tool. Is used as the tool trajectory data for manufacturing the final structure. Therefore, no interference with the tool occurs when the machining allowance of the intermediate structure manufactured based on the intermediate structure shape design data is machined by the NC machine tool.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a general structure of a CAD / CAM system 11 to which the embodiment of the present invention is applied.

In FIG. 1, a CAD / CAM system 11 connected to a host computer 21 through a network 22 such as an insertnet has a central processing unit and is a computer 23 having a role of figure calculation and display control database management. Mass storage device 24 such as an optical disk capable of storing and updating a large amount of graphic information, XY
A graphic output device 25 such as a plotter, a plurality of graphic display devices 26 which are central devices for dialogue between the CAD / CAM system 11 and its user (operator) and are used in conjunction with the input device, and each graphic display device 26. Tablet 31, keyboard 32, mouse 33, light pen 3 having a stylus pen connected to
It is composed of 4 devices.

The computer 23 has an operating system, system software, application software for creating CAD shape design data, machining allowance data, CAM tool data, tool interference confirmation and tool trajectory data. (So-called CL data)
It goes without saying that application software for creating is included. The tool trajectory data can be easily converted into NC machining data represented by G code or the like.

CAD / CAM system 11 as described above
Can be used to implement embodiments of the invention. In the following description of the operation, it will be complicated to refer to the CAD / CAM system 11 each time, and therefore it will not be referred to unless necessary.

Next, the operation of the embodiment of the present invention will be described with reference to FIG.
It will be described based on the flowchart shown in FIG. The control subject in the flowchart of FIG. 2 is the computer 23.
In order to facilitate understanding of the present invention, in this embodiment, the intermediate structure shape design data to be created is assumed to be disappearance type shape design data with a stock removal. Further, the vanishing mold is assumed to be a prototype when a press die for molding an outer panel (side panel outer) of an automobile is manufactured as a cast product. That is, the vanishing type of the press die is defined as the final structure, and the vanishing type in which a stock removal is given to the final structure is defined as the intermediate structure.

Therefore, the tool locus data to be created in this embodiment is obtained by machining the intermediate structure manufactured by using the intermediate structure shape design data with the NC machine tool to obtain a desired final product. It becomes the tool locus data for obtaining the structure.

Therefore, first, the CAD / CAM system 1
The design data of the press die is created by one or another CAD system (step S11). Design data of a press die created by another CAD system is read from the host computer 21. The design data of this press die can be used as the disappearance type three-dimensional shape design data as the final structure, excluding the material.

FIG. 3 is a display on the display device 26 and shows a mold structure 41 based on the three-dimensional shape design data which is the mold design data. The die structure 41 also displays a finish symbol based on the data relating to the finish symbol indicating the finish state of the surface.
That is, the degree of processing of the surface indicated by the arrow is represented by the number of triangular symbols (∇). Instead of the triangle symbol, another symbol representing the surface roughness may be used. Further, the surface not provided with the triangle symbol is the surface provided with the corrugated symbol that does not particularly define the finishing accuracy.

FIG. 3 shows the shape of the lower die of the press die. This die structure 41 is basically a product shape forming for forming a steel plate, which is a work (not shown), into a desired product shape. It is composed of a part 42 and a mold structure part 43 that holds the periphery of the product shape forming part 42. The die structure portion 43 includes a guide post hole 44 into which an upper die guide post (not shown) is inserted, a cam 45 for forming a bent portion on the work, and the like.

Next, the surface that needs to be processed is specified (step S12). In this case, the surface that needs to be processed is the surface to which the finishing symbol is added, and thus can be easily specified.

Next, the attribute information is automatically or manually added to the specified surface that needs to be processed (step S13). Here, the attribute information that is automatically given is, for example, a machining allowance, and the attribute information that is manually given is a dimensional tolerance after machining of the machining allowance. Dimensional tolerances can also be added automatically. Further, as will be described later, for example, the rib dividing position is automatically designated, and the tool trajectory data of the rib that designates the dividing position is automatically created. Further, as will be described later, by designating a ridge line as attribute information, a so-called molten metal escape portion is automatically created at that portion. Furthermore, the machining direction of the machining allowance by the tool can be given automatically or manually.

The step S13 will be specifically described. First, regarding the groove portion or the recessed portion, in relation to the length and the tool diameter of the tool such as the end mill, as shown in FIG. 4A, as compared with the groove 51 having a relatively shallow working depth d of two triangular symbols, 4B, a so-called flush allowance 51a is provided, as shown by a grained portion in FIG. 4B.
In addition, hereinafter, the machining allowance is grained. On the other hand, as shown in FIG. 4C, the groove 52 having a relatively deep working depth d is provided with a machining allowance 52a corresponding to the wall surface as shown in FIG. 4D. Thus groove 5
By providing the machining allowances 51a and 52a according to the depth d of 1 and 52, the possibility of breakage of the tool is avoided in advance. In the case of the grooves 51 and 52 of FIGS. 4B and 4D, the processing direction is a direction orthogonal to the paper surface.

On the other hand, as for the convex portion, as shown in FIG. 5A, a trapezoidal machining allowance 53a having an extended taper is provided on the upper surface of the convex portion 53 having a tapered portion (see FIG. 5B). ). Further, as shown in FIG. 5C, a machining allowance 54a having a rectangular cross section is provided on the upper surface of the convex portion 54 having a rectangular cross section on a trapezoidal section (see FIG. 5D). Further, as shown in FIG. 5E, a machining allowance 55a having a trapezoidal cross section is provided to the upper surface of the convex portion 55 having a rectangular cross section on a side surface of the cross section having R (R). (See Figure 5F). In this case, as shown in FIG. 5B, by providing a trapezoidal machining allowance 53a, the disappearance type material (foam polystyrene) is reduced as compared with the case where a machining allowance having a rectangular cross section is conventionally provided. be able to. As shown in FIG. 5F, the machining allowance 55a having a trapezoidal cross section is provided by the designer intentionally for the purpose of reducing the machining load on the tool in the later machining process. is there.

Next, as shown in FIG. 6A, when the ridge line instruction 56a (see also FIG. 3) is given to the groove portion 56, the portion where the ridge line instruction 56a is given is escaped as shown in FIG. 6B. The part 56b is formed, and then the machining allowance 56c is provided (see FIG. 6C).

Further, as shown in the sectional shape of FIG. 7, cylinders having different diameters are stacked, and when a hollow rib 61 having a substantially tubular shape as a whole is required, it is complicated to provide a machining allowance. Since it is omitted, the division instruction surface 61a, considering the ease of processing by an NC machine tool (not shown),
The division position is designated by 61b, and the reference numeral 61c,
It is divided into three parts 61d and 61e.

Then, each of these divided portions 61c
8A to 8C, tool trajectory data of the tools 62a to 62c and 63d to 63f are automatically created for .about.61e. In the case of machining with the tools 63d to 63f, the divided parts 61c to 61e as works are
It is turned upside down and installed on the pedestal of an NC machine tool (not shown).

Since each of the divided portions 61c to 61e, which has been machined by the NC machine tool, is made of expanded polystyrene, it can be integrated by applying an adhesive to the portions divided by the division indicating surfaces 61a and 61b. The ribs 61 can be formed.

Next, it is confirmed whether or not the attribute information such as the machining allowance is added to all the surfaces that need to be processed, and the attribute information adding process of step S13 is ended (step S14).

Next, the processed surfaces to which the attribute information is added are classified (step S15). This classification is performed by paying attention to the fact that the machining time can be reduced by, for example, continuously machining the machining surfaces to which the same finishing symbol is given by using machining tools having the same diameter. By scanning the machined surface with an end mill with a small tool diameter, the machining balance becomes low and precision finishing is possible, and by scanning the surface with an end mill with a large tool diameter, the machining balance becomes high. And rough finish.

Note that this classification can be performed using the window on the screen, as shown below.

FIG. 9 shows a classification window displayed on a part of the screen (also referred to as attribute classification addition / editing window).
71 is shown. On the background side of this screen, the mold structure 41 shown in FIG. 3 is displayed.

In FIG. 9, the left column shows the attribute name 7 of "machining surface", "roughness", "machining allowance", "color", and other (undefined).
2, the right column shows an attribute table 74 showing specific attributes selectable for each attribute, and the middle column shows the selection attribute 73 selected from the attribute table 74 using the mouse 33 or the like. There is. In the attribute name 72, “color” is a color display because it uses a color CRT. Further, in the "machined surface" of the attribute name 72, the "molded surface" is the product shape molding part 4 of the mold structure 41 shown in FIG.
The "bottom" is the rear surface of the molding surface and the mounting surface to a press machine (not shown). “Cross-section material (profile)” represents a member such as the rib 61 shown in FIG.
ng surface) ”represents the guide post hole 44 and the like. Further, the instructions 75 displayed in the lower columns respectively indicate “OK” indicating the end of the screen, “Next item” for selecting the next item (next page), and cancellation of the screen. There is “cancel”, which can be selected by the mouse 33 or the like.

Therefore, for example, as shown in FIG.
Processed surface is "forming surface", roughness is "▽▽", and stock removal is "1".
After setting "0" and the color to "green", the "next item" in the instruction 75 is selected. Next, with the machining surface as the “molding surface”, the roughness as “∇”, the machining allowance as “5”, and the color as “yellow”, the “next item” in the instruction 75 is selected. Finally, in command 75, select the "next item",
Processed surface is "forming surface", roughness is "▽▽▽", and stock removal is "1".
5 ”, the color is“ blue ”, and“ OK ”is selected in the instruction 75.

As a result, FIG. 1 showing the image before the allowance is given.
In contrast to 0, as shown in FIG. 11, it is possible to recognize (visually recognize) on the screen a figure in which a machining allowance is given for each classified processed surface (processed portion) (step S1).
6).

More specifically, it is indicated by a finishing symbol ▽▽ in the mold structure 41 shown in FIG. 10 (not a partially enlarged view of FIG. 3, but the same reference numerals are used and the mold structure 41 is referred to). The plate mounting surface 81 to be removed is a machining allowance 81b shown in FIG.
As shown as a mold structure 41a provided with 82b and 83b, it is automatically drawn as a plate mounting surface 81a provided with a 10 mm machining allowance 81b (the machining allowance 81b is green). Further, the bearing surface 83 (see FIG. 10) indicated by the finishing symbol ▽ is a 5 mm allowance 83 shown in FIG.
The guide post surrounding contact surface 83a is provided with the mark b (the margin 83b is yellow). Further, the cam surface 82 indicated by the finishing symbol ▽▽▽
(See FIG. 10) is a 20 mm allowance 82b shown in FIG.
(The machining allowance 82b is blue) is automatically drawn as the cam surface 82a.

If necessary, the attribute can be extracted and output on the screen, stored in a file, or defined as a so-called macro command program. In this case, as shown in FIG. 12, the attribute extraction window 85 is opened on the screen. Then, for example, "roughness" is entered in the attribute name frame 86, "▽▽" is entered in the attribute value frame 87, "match" is entered in the state frame 88, and the condition frame is entered. Enter "and" in 89. And
As shown in the figure, for example, the macro definition frame 90 is clicked. By clicking, an “X” mark is added in the macro definition frame 90. Then, in order 75, "OK"
By clicking the column, you can define a macro program that extracts all the machining surfaces that match the finishing degree "▽▽".

Next, tool locus data for a predetermined tool is automatically created for a die structure with a machining allowance (also referred to as a machining allowance type structure) 41a (see FIG. 11) ( In step S17), it is confirmed whether or not there is any interference between the workpiece-mounting-type structure 41a, which is a workpiece, and the tool head portion of the NC machine tool (not shown) (step S18). Then, if interference has occurred, correction such as tool replacement (step S19) is performed while checking the screen, and a tool trajectory is created again with the changed tool (step S17 again).

Here, the steps from the provision of the machining allowance to the creation of the tool locus will be described with reference to FIGS.

First, as shown in FIG. 13A, the mold structure 41 in which the finishing state of the surface is designated by the finishing symbol ▽▽▽
On the other hand, as shown in FIG. 13B, the machining allowance 95 is added to form the mold structure 41a. Next, as shown in FIG. 13C, a tool 91 and a chuck portion 92 that holds the tool 91.
In order to create a tool locus (tool locus data) with respect to the machining allowance-type structure 41a related to the tool head 94 including the holder 93 for fixing the chuck portion 92, interference is confirmed on the screen. In FIG. 13C, the tool head 9
4 and the holder 93 and the allowance 95 in the allowance type structure 41a.
It is visually recognized that and interfere with each other in the interference part 96 displayed in red, for example. When an interference occurs during the automatic generation of the tool trajectory data, a warning may be given by a buzzer or a voice in addition to the color display of the interference section 96 shown in FIG. 13C.

In the interference occurrence state shown in FIG. 13C, the operator uses the tool 91, for example, a tool 9 having a longer tool length.
Change to 1a (see FIG. 13D) and check the interference again. In this way, it is possible to create the tool locus for the removal allowance type structure 41a almost automatically. As is well known, the created tool path data is NC for NC machine tools.
It can be easily converted into processed data.

The above description is for the flowchart of FIG.

Next, referring to FIG. 14, the whole process from the start of the design of the disappearance mold which is a structure to the actual production of the disappearance mold which is a structure, and the conventional technique as necessary. Explanations will be given in comparison. FIG. 14 is an overall process diagram provided for explaining the conventional technique. Although the contents of each process are different from those of the present invention in many parts, the flow of the process is the same, and thus the same drawing is re-posted. In order to avoid complexity, description will be made with reference to FIG.

In the die design process of step S1 in FIG. 14, in the prior art, the production technology development department assigned the design data of the press die to which the data relating to the finish symbol designating the finish state of the surface was given (final In this embodiment, all the steps shown in the flowchart of FIG. 2 are carried out in contrast to the creation of the lost object shape design data). Therefore, in addition to creating the final disappearance shape design data, in addition to creating the intermediate disappearance shape design data with a machining allowance,
The tool locus data for which interference confirmation has been completed is created. In addition, dimensional tolerances after machining are also given.

Therefore, in this embodiment, step S1 and step S2 are the same system of CAD / CAM.
It will be created on the system 11.

In step S3, a final vanishing type with a stock removal, that is, an intermediate vanishing type is manufactured with reference to the drawing based on the intermediate structure shape design data, and step S4
In the manufactured intermediate disappearance type acceptance test is performed. In the acceptance inspection process, the inspection time is shortened because the drawing is already checked and the actual product is verified.

Next, in step S5, step S5 is performed in advance.
By using the tool trajectory data created in the first die design process, the NC vanishing tool finishes the intermediate vanishing die to produce the final vanishing die.

In this case, since the tool locus data in which the machining allowance is expected is created in advance, the tool head does not interfere with the machining allowance disappearance type (intermediate disappearance type).

Then, after the operator manually measures the dimensions of the final vanishing type manufactured by the NC machine tool using a three-dimensional measuring machine or the like, the measured dimension values are CAD / CAM.
By inputting into the system 11, it is possible to automatically determine whether or not it is within the dimensional tolerance of the final vanishing shape design data which is compared with the above dimensional tolerance and is first created in the production technology development department.

After the so-called sand-filling work is performed using the vanishing mold, which is the final mold structure, thus produced as a prototype, the molten metal is injected to evaporate the vanishing mold and complete the mold. At the same time, the first casting is completed. The completed casting is used as a press die for forming the outer plate.

As described above, according to the above-described embodiment, C
On the AD / CAM system 11, the shape design data of the final structure in which a margin is given to a specific surface in the shape surface of the final structure instructing the finish state of the surface is created (step S13). Interference with the tool is confirmed on the CAD / CAM system 11 for the final structure with the allowance, and the shape design data of the final structure with the allowance that does not interfere with the tool is used as the intermediate structure shape design data. (Steps S17 to S19).

Therefore, when the machining allowance in the intermediate structure manufactured based on the intermediate structure shape design data is machined by the NC machine tool, the effect that interference with the tool does not occur is achieved. To be done.

Since the CAD / CAM system 11 that has created the shape design data of the final structure creates the shape design data of the final structure in which the allowance is given to the specific surface (step S13). The effect that it is possible to prevent so-called human error (human error) such as dimensional input error when the machining allowance is given is achieved.

In particular, when the intermediate structural member is the vanishing type with the removal allowance, the so-called lead time until obtaining the final vanishing type, that is, from the vanishing type design to obtaining the vanishing type actual product. The effect that the time can be considerably shortened is achieved.

Further, in the product inspection step of step S6, the collation of the measured dimension and the tolerance can be automated, so that the number of man-hours can be remarkably reduced as compared with the conventional visual confirmation work.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0076]

As described above, according to the present invention, the shape design data of the final structure to which the machining allowance is given is created on the CAD system, and the final structure with the machining allowance and this are produced on the CAM system. The interference with the tool to be machined into the final structure is confirmed, and the shape design data of the final structure with machining allowance that does not interfere with the tool is used as the intermediate structure shape design data.

Therefore, when machining the machining allowance in the intermediate structure (final structure with machining allowance) manufactured based on the intermediate structure shape design data thus created, when machining with the NC machine tool. The effect that the interference with the tool is prevented as much as possible is achieved.

Further, since the CAD system that has created the shape design data of the final structure creates the shape design data of the final structure with a stock removal, so-called human error such as dimensional input error when the stock removal is given. The effect of preventing static errors (human errors) is also achieved. Therefore, for example, the probability of an input error or the like is reduced, so that the probability of a defect occurring in a subsequent process is reduced, and the manufacturing cost as a whole can be reduced.

In particular, when the intermediate structure is the vanishing type with the stock removal, the so-called lead time until obtaining the final vanishing type, that is, from the design of the vanishing type to obtaining the actual vanishing type The effect that the time can be considerably shortened is achieved.

Further, according to the present invention, the shape design data of the final structure with the mounting allowance is created on the CAD system,
On the CAM system, create tool path data as a result of confirming interference with the tool for the final structure with machining allowance, and process this tool path data as a final result by machining an intermediate structure with an NC machine tool. It is used as tool locus data for manufacturing a structure. Therefore, when the machining allowance of the intermediate structure manufactured based on the intermediate structure shape design data is machined by the NC machine tool, the effect that interference with the tool does not occur is achieved. Further, it is possible to create the tool trajectory data for the intermediate structure in a relatively short time.

According to the method for creating intermediate structure shape data according to the present invention, the data required for the downstream process is created in the upstream process, so that the work in the downstream process which is the downstream process is smooth. The effect of being carried out is achieved.

[Brief description of the drawings]

FIG. 1 is a CAD / C to which an embodiment of the present invention is applied.
It is a block diagram which shows the structure of AM system.

FIG. 2 is a flow chart provided for explaining an example of a mold design process using the CAD / CAM system of FIG.

FIG. 3 is a perspective view showing an example of a structure.

4A to 4D are diagrams for explaining the provision of a machining allowance, FIG. 4A is a diagram showing a structure having a relatively shallow groove with a finishing symbol, and FIG. 4B is a comparison thereof. FIG. 4C is a view showing a structure in which a relatively deep groove is provided with an allowance, FIG. 4C is a view showing a structure having a relatively deep groove with a finish symbol, and FIG. 4D is an illustration showing a structure in which a relatively deep groove is provided with an allowance. It is a figure which shows a structure.

5A to 5F are views for explaining the provision of a machining allowance, FIG. 5A is a diagram showing a structure having a trapezoidal portion, and FIG. 5B is a trapezoidal machining allowance on the trapezoidal portion. FIG. 5C is a diagram showing a structure in which a square portion is formed on a trapezoidal portion, and FIG. 5D is a square shape on a square portion formed on a trapezoidal portion. FIG. 5E is a diagram showing a structure provided with a machining allowance, FIG. 5E is a diagram showing a structure in which a square-shaped portion is formed on a trapezoidal portion whose side edges are substantially arc-shaped, and FIG. 5F is a substantially arc-shaped side. It is a figure which shows the structure in which the square-shaped machining allowance was provided on the square-shaped part formed on the trapezoidal part.

6A to 6C are views for explaining the provision of a machining allowance and the like, FIG. 6A is a view showing a structure having a groove with a finishing symbol, and FIG. 6B is a ridge line of the groove. FIG. 6C is a view showing a structure in which a hot water escape portion is added to a portion including a, and FIG. 6C is a view showing a structure in which a allowance is added to the structure having a hot water escape portion.

FIG. 7 is a view showing a state in which a dividing position indicating line is attached to the cross section of the rib.

8A to 8C are views for explaining the creation of tool trajectory data for the divided ribs.
FIG. 8A is a diagram used to explain the creation of tool trajectory data for the upper portion, FIG. 8B is a diagram used to explain the creation of tool trajectory data for the intermediate portion, and FIG. 8C is an illustration used to create tool trajectory data for the lower portion. FIG.

FIG. 9 is a diagram provided for explaining a screen of a classification window.

FIG. 10 is a partially enlarged view of the final structure.

FIG. 11 is a partially enlarged view of the intermediate structure.

FIG. 12 is a diagram provided for explaining a screen of an attribute extraction window.

13A to 13D are views provided for explaining a series of steps, FIG. 13A is a view showing a structure with a finishing symbol, and FIG. 13B is a view showing a structure with a machining allowance. 13C is a diagram showing a process of confirming the interference between the removal allowance type structure and the tool, and FIG. 13D is a diagram showing a state in which the length of the tool is lengthened according to the result of the interference confirmation.

FIG. 14 is an overall process diagram for explaining a flow of designing / manufacturing / inspecting a structure by taking the disappearance type as an example.

[Explanation of symbols]

11 ... CAD / CAM system 23 ... Computer 26 ... Display device 41 ... Mold structure 41a ... Substitution model structure 42 ... Product shape molding part 43 ... Mold structure part 51a, 52a, 53a, 54a, 55a, 56c, 8
1b, 82b, 83b, 95 ... Stock removal 56a ... Ridge line instruction 56b ... Relief part 61 ... Rib 71, 85 ... Window 81 ... Plate mounting surface 82, 82b ... Cam surface 83 ... Seating surface

Claims (5)

[Claims] 1. A method of creating shape design data for an intermediate structure, wherein an intermediate structure is manufactured, and this intermediate structure is processed by an NC machine tool to manufacture a final structure. On the system, create the shape design data of the final structure in which the finish state of the surface is instructed, identify the surface that needs to be machined in the shape surface of the final structure, and remove the margin for the specified surface. The shape design data of the final structure is given, and the final structure with the machining allowance is checked for interference with the tool on the CAM system. A method for creating intermediate structure shape design data, wherein the final structure shape design data is the intermediate structure shape design data. 2. The method for creating intermediate structure shape design data according to claim 1, wherein the CAD system also gives a finish state of the surface and a dimensional tolerance after the machining. 3. The method for creating intermediate structure shape design data according to claim 1, wherein the finish state of the surface is specified by a finish symbol. 4. The method for creating intermediate structure shape design data according to claim 1, wherein the structure is a vanishing type for casting. 5. A method of creating tool trajectory data for producing an intermediate structure and machining the intermediate structure with an NC machine tool to produce a final structure, comprising: The shape design data of the final structure that gives an indication of the finishing state is created, the surface that requires processing is specified in the shape surface of the final structure, and the final surface is provided with a machining allowance. The shape design data of the structure is created, and the CAM is applied to the final structure with the allowance.
A method for creating tool locus data, characterized in that tool locus data is created as a result of interference confirmation on the system, and this tool locus data is used as the tool locus data for the NC machine tool.