JP2015109033A - Drawing model creation method, and drawing model creation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create a drawing model that enables the design of layout of a conveyance device immediately after the shape of a product has been designed.SOLUTION: A drawing model creation system 1 creates a drawing model 9 of a press-molding product from CAD data having a product part 91 and a die face part 95. In particular, the drawing model creation system 1 includes a storage device 8 that stores a plane grating 10, which is created with a plurality of feature points 101 respectively defined by individual XY-coordinates, a coordinate calculation unit 42 that projects the plane grating 10 on the CAD data and calculates Z-coordinates on the CAD data coinciding with the XY-coordinates of the feature points 101 as the Z-coordinates of the feature points 101, and a drawing model creation unit 43 that connects the feature points 101 having obtained the XYZ-coordinates to form into a polygon to create the drawing model 9 of the press-molding product.

Description

  The present invention relates to a draw model generation method and a draw model generation system. Specifically, the present invention relates to a draw model generation method and a draw model generation system for generating a draw model for molding a press-formed product.

  Panel products such as outer panels and roof panels for automobiles are manufactured by pressing a single plate with a mold that has a desired product shape to form a press-molded product. Is formed by forming a flange portion or making a hole through which a bolt is inserted. In such a panel product, a production line is designed before a production process for actual production.

  Specifically, when the design design of the product shape is performed, a draw model of a press-formed product is generated from this design design, and the model shape is evaluated by CAE (Computer Aided Engineering), so that the designed shape is actually It is decided to check whether it can be pressed.

Here, the relationship between the product shape and the draw model will be described with reference to FIG. The draw model 9 includes a product portion 91 designed for a vehicle type, a surplus portion 93 that is assumed to be cut off, and a die face portion 95 that is assumed to be pressed when pressed with a mold. Consists of.
Since the product shape is obtained when the design design is made, the product portion 91 of the draw model 9 can be generated together with the design design. The die face portion 95 is basically a flat surface because it is assumed to be a heel presser, and can be generated relatively easily. On the other hand, since the surplus portion 93 is a portion that deforms in accordance with the press work, it takes much time to generate the surplus portion 93 in the generation of the draw model 9.

  Further, when the model shape evaluation by CAE is not good, it is necessary to repeat the correction of the surplus portion and the analysis by CAE, which takes a huge amount of time. Therefore, in recent years, a model design system is known that can design a draw model whose quality is guaranteed by CAE in a short time by selecting the shape of the surplus portion from a predetermined template (Patent Document 1).

JP 2009-104456 A

By the way, in the design of the production line, in addition to the design of the pressing parameters for forming the product shape such as the pressure to press the plate and the shape of the mold, the layout of the handling tool in the study of the transport load for transporting the plate is also examined. Is called. Here, there is a problem that the design timing is delayed when the layout design of the transfer apparatus is performed after the quality assurance by CAE is awaited.
In this respect, it has been found that parameters such as the weight and the center of gravity of the transported plate material are important in the layout design of the transport device, and can be performed even if the quality of the molded product is low.

  Accordingly, an object of the present invention is to provide a draw model generation method and a draw model generation system capable of generating a draw model capable of immediately designing a layout of a conveyance device after a product shape design is designed. To do.

  The present invention relates to a draw model generation method for generating a draw model of a press-formed product from CAD data having a product portion and a die face portion, each of which is a plane point by a plurality of feature points defined by individual XY coordinates. Generating a group, projecting the plane point group onto the CAD data, calculating a Z coordinate on the CAD data coinciding with an XY coordinate of the feature point as a Z coordinate of the feature point, Generating a draw model of the press-molded product by connecting the feature points from which the XYZ coordinates are obtained by the process into polygons.

In the present invention, a plurality of feature points defined by the XY coordinates are projected on the shape data of the product portion and the die face portion, and the Z coordinates included in the shape data of the position matching the XY coordinates of the feature points are characterized. Calculated as the Z coordinate of the point. Then, the feature points whose XYZ coordinates are calculated are connected to form a polygon.
Thereby, it is possible to generate a draw model including a surplus part that takes an enormous amount of time to generate. As a result, the weight and the center of gravity of the plate material to be conveyed can be grasped in advance, and the layout design of the conveyance device can be performed prior to the model shape evaluation by CAE.

  Further, the step of calculating the Z coordinate of the feature point includes a step of determining whether or not the product part or the die face part exists at a position coinciding with the XY coordinate of the feature point on the CAD data. When the product part or the die face part exists, the step of calculating the Z coordinate of the product part or the die face part as the Z coordinate of the feature point, and when the product part and the die face part do not exist And a step of calculating the Z coordinate of the feature point from the Z coordinate of the feature point around the feature point.

In the present invention, when shape data (product part and die face part) exists at a position that coincides with the XY coordinates of the feature point, the Z coordinate of the shape data is calculated as the Z coordinate of the feature point. When there is no shape data (product part and die face part) at a position that coincides with the XY coordinates of the feature point, the Z coordinate of the feature point is calculated from the Z coordinates of the feature points around the feature point.
Thereby, the shape of the surplus part where shape data does not exist can be interpolated, and a draw model including the surplus part can be generated.

  Further, the step of calculating the Z coordinate of the feature point from the Z coordinate of the peripheral feature point includes the step of calculating the peripheral feature point where the product part or the die face part is present among the peripheral feature points of the feature point. The Z coordinate of the feature point may be calculated by weighting the Z coordinate based on the distance from the feature point to the peripheral feature point.

In the present invention, the Z coordinates of the feature points (peripheral feature points) for which the Z coordinates can be calculated among the feature points around the feature points to be calculated are weighted based on the distance from the feature points to be calculated to the peripheral feature points. By doing so, the Z coordinate of the feature point to be calculated is calculated.
Usually, since a press product has a shape with a certain continuity, the shape of the surplus portion can be generated with an accuracy of a predetermined level or more by interpolation by weighting based on such a distance. it can. As a result, parameters such as the weight and the center of gravity of the transported plate material can be acquired appropriately, and the layout design of the transport apparatus can be performed prior to the model shape evaluation by CAE.

  Further, the step of generating the plane point group may include arranging a plurality of feature points in a grid pattern at predetermined intervals.

  In the present invention, the interval between the planar lattices is set to a predetermined interval. Thereby, it is possible to keep the polygon bending angle below a predetermined value, which is preferable.

  The present invention also includes a draw model generation system capable of executing the above-described draw model generation method.

  According to the present invention, a draw model including a surplus portion can be generated from the shape data of the product portion and the die face portion, and the layout design of the transfer device can be performed immediately after the design design of the product shape is made. Can do.

It is a figure which shows the outline | summary of a draw model production | generation system. It is a block diagram which shows the function structure of a draw model production | generation system. It is a figure which shows an example of the plane grating | lattice which has a some feature point. It is a figure which shows an example of the calculation method of the Z coordinate of the projected feature point. It is a flowchart which shows the flow of a process of a draw model production | generation system. It is a flowchart which shows the flow of a process of a draw model production | generation system. It is a figure which shows an example of the draw model which consists of a product part, a surplus part, and a die face part.

  Hereinafter, a preferred embodiment of a draw model generation system of the present invention will be described with reference to the drawings.

[Outline of draw model generation system]
First, the outline of the draw model generation system of the present invention will be described with reference to FIG. In the draw model generation system, a draw model 9 of a press-formed product is generated from a product part 91 and a die face part 95 generated using CAD (Computer Aided Design). Specifically, in the draw model generation system, as shown in FIG. 1B, each of the regions corresponding to the draw model 9 including the product portion 91 and the die face portion 95 is defined by individual XY coordinates. A planar grid 10 composed of a plurality of feature points 101 is projected. Then, as shown in FIG. 1C, the projected feature points 101 are connected to form a polygon 102, thereby generating a draw model 9.

At this time, as shown in FIG. 1A, since the shape of the product part 91 and the die face part 95 is defined in advance, the coordinates of the feature point 101 projected onto the product part 91 and the die face part 95 (Z (Coordinates) can be easily obtained. On the other hand, since the shape of the surplus portion 93 is not defined, the coordinates (Z coordinate) of the feature point 101 projected onto the surplus portion 93 cannot be acquired.
In this regard, in the draw model generation system of the present invention, the draw model 9 is generated by interpolating the coordinates (Z coordinate) of the feature point 101 projected on the surplus portion 93 by a method described later. Details will be described below.

[Draw model generation system configuration]
Then, with reference to FIG. 2, the structure of the draw model production | generation system 1 of this invention is demonstrated. FIG. 2 is a block diagram showing a functional configuration of the draw model generation system 1 according to an embodiment of the present invention.
The draw model generation system 1 includes an input device 2 through which an operator inputs various data and commands, an arithmetic device 4 that executes various arithmetic processes according to inputs from the input device 2, and a display device 6 that displays an image. And a storage device 8 for storing various data.

  The input device 2 includes hardware such as a keyboard and a mouse that can be operated by an operator. Data and commands input by operating the input device 2 are input to the arithmetic device 4.

  The display device 6 is configured by hardware such as a CRT or a liquid crystal display capable of displaying an image. For example, a three-dimensional image of a draw model is displayed on the display unit of the display device 6 as a processing result by the arithmetic device 4.

  The storage device 8 is configured by hardware such as a hard disk drive or a solid state drive, and stores CAD data including shape data of the product part 91 and shape data of the die face part 95 generated using CAD. The CAD data stored in the storage device 8 does not include the shape data of the surplus portion 93. Further, the storage device 8 stores plane grid data including data (XY coordinates) of feature points 101 constituting the plane grid 10.

  The arithmetic device 4 is configured by hardware such as a CPU, and functions as a plane lattice generation unit 41, a coordinate calculation unit 42, and a draw model generation unit 43 in cooperation with predetermined software.

  The plane grid generator 41 generates the plane grid 10 shown in FIG. 3 in response to a command from the operator via the input device 2. The planar lattice 10 generated by the planar lattice generation unit 41 is stored in the storage device 8. The plane grid 10 may be stored in advance in the storage device 8 and read out from the storage device 8 as necessary, instead of being generated according to the operation of the operator.

Here, the planar grating 10 will be described with reference to FIG. As shown in FIG. 3A, the planar grid 10 is configured by arranging a plurality of feature points 101, each defined by individual XY coordinates, in a grid at predetermined intervals.
The interval between the feature points 101 can be arbitrarily set. However, when the draw model relates to a panel product such as an outer panel or a roof panel of an automobile, the interval is preferably set to 0.5 mm. This point will be specifically described with reference to FIGS. FIG. 3B is a schematic diagram showing a cross-sectional shape of the product portion 91, and FIG. 3C is a portion where the polygonal bending angle is the largest among panel products such as an outer panel and a roof panel of an automobile. It is a figure which shows the relationship between the space | interval of the feature point 101 in FIG.

As described above, in the draw model generation system 1 of the present invention, the plane grid 10 (feature point 101) is projected onto the product unit 91 and the like, and the Z coordinate of the feature point 101 is acquired. Here, the interval between the feature points 101 projected on the product part 91 varies depending on the inclination of the product part 91 with respect to the XY coordinates.
With reference to FIG. 3 (B), the product part 91 considers the cross-sectional shape comprised from the planes 911 and 913 substantially parallel to XY coordinate, and the inclined surface 912 inclined by predetermined angle with respect to XY coordinate. At this time, when the interval L1 between the feature points 101 projected onto the planes 911 and 913 is compared with the interval L2 between the feature points 101 projected onto the slope 912, the interval L2 becomes wider. The interval between the feature points 101 is a bending angle of the polygon 102 when the polygon 102 is acquired by connecting the feature points 101. If the bending angle of the polygon 102 is large, it causes an error in the model shape evaluation by CAE, so it is necessary to keep it within a range where no error occurs.
As shown in FIG. 3C, in the model shape evaluation by CAE, if the bending angle of the polygon 102 exceeds θmax, there is a problem such as an error or an incorrect solution. In this regard, in an automotive panel product, the polygon 102 has a bent angle of approximately θmax by setting the interval between the feature points 101 to 0.7 mm, and the polygon 102 has a bent angle by setting the interval between the feature points 101 to 0.5 mm. Was confirmed to be less than θmax. Therefore, when a draw model is generated for a panel product of an automobile, it is preferable to set the interval between the feature points 101 to 0.5 mm at a location where the shape change is large.
Note that θmax is an empirical threshold and is different for each CAE software.

Returning to FIG. 2, the coordinate calculation unit 42 projects the planar grid 10 on the CAD data, and calculates the Z coordinate on the CAD data that matches the XY coordinate of the feature point 101 as the Z coordinate of the feature point 101. Thereby, the Z coordinate is given to the feature point 101 arranged on the XY plane.
Here, the coordinate calculation unit 42 will be described in more detail with reference to FIG. FIG. 4A is a schematic diagram showing a cross-sectional shape of CAD data. Referring to FIG. 4A, since the shape data of the product portion 91 and the die face portion 95 is stored in the storage device 8 in advance, the feature points 101 projected on the product portion 91 and the die face portion 95 are stored. The Z coordinate can be easily obtained from the shape data of the product part 91 and the die face part 95. On the other hand, since shape data is not set for the surplus portion 93, a device for appropriately acquiring the Z coordinate of the feature point 101 projected on the surplus portion 93 is required.
Returning to FIG. 2, the coordinate calculation unit 42 includes a determination unit 421, a first Z coordinate calculation unit 422, and a second Z coordinate calculation unit 423.

  The determination unit 421 determines whether shape data is set at a position on the CAD data that matches the XY coordinates of the projected feature point 101. More specifically, the determination unit 421 determines whether or not the feature point 101 is projected on the CAD plane (product unit 91, die face unit 95), that is, the product unit 91 or the position of the feature point 101 coincides with the XY coordinates of the feature point 101. It is determined whether or not the die face portion 95 exists.

  The first Z coordinate calculation unit 422 functions when the product part 91 or the die face part 95 exists at a position that coincides with the XY coordinates of the feature point 101, and is based on the shape data of the product part 91 or the die face part 95. Thus, the Z coordinate of the feature point 101 is calculated. Specifically, the first Z coordinate calculation unit 422 calculates the Z coordinate of the product part 91 or the die face part 95 at the position coinciding with the XY coordinate of the feature point 101 as the Z coordinate of the feature point 101.

  The second Z coordinate calculation unit 423 functions when the product part 91 and the die face part 95 do not exist at a position that coincides with the XY coordinates of the feature point 101, and the Z coordinate of the feature point 101 around the feature point 101. From this, the Z coordinate of the feature point 101 is calculated. The peripheral feature point 101 is a feature point 101 in the vicinity of the feature point 101 where the product portion 91 and the die face portion 95 do not exist among the feature points 101 for which the Z coordinate can be calculated.

Here, an example of a Z coordinate calculation method by the second Z coordinate calculation unit 423 will be described with reference to FIG. In FIG. 4B, a feature point 101 is a feature point where the product portion 91 and the die face portion 95 do not exist in the corresponding XY coordinates, and the Z coordinate is Z. The feature points 101a, 101b, 101c, and 101d are feature points around the feature point 101, and the Z coordinates are calculated as Za, Zb, Zc, and Zd, respectively.
The second Z coordinate calculation unit 423 calculates the Z coordinates Za, Zb, Zc, Zd of the calculated feature points 101a, 101b, 101c, 101d from the feature point 101 to the feature points 101a, 101b, 101c, 101d. The Z coordinate of the feature point 101 is calculated by performing weighting based on. This weighting method is arbitrary, and most simply, linear interpolation is performed on the Z coordinates Za, Zb, Zc, and Zd of the feature points 101a, 101b, 101c, and 101d, so that the Z coordinate of the feature point 101 is obtained. calculate. Of course, the present invention is not limited to linear interpolation, and the Z coordinate of the feature point 101 may be calculated by nonlinear interpolation using a predetermined approximate expression.

As an example, when linear interpolation is performed, the Z coordinate of the feature point 101 can be calculated by the following equation.
Z = Ka * Za + Kb * Zb + Kc * Zc + Kd * Zd Formula (1)
Ka + Kb + Kc + Kd = 1 Expression (2)
Ka · Na = Kb · Nb = Kc · Nc = Kd · Nd (3)
Note that Ka, Kb, Kc, and Kd are weights based on the distance from the feature point 101, and Na, Nb, Nc, and Nd are distances from the feature point 101 (synonymous with numbers in the case of a grid). It is. The following formula (4) is derived from these formulas (1) to (3), and the Z coordinate of the feature point 101 can be calculated from the formula (4).

  In this manner, the first Z coordinate calculation unit 422 calculates the Z coordinate of the feature point 101 projected on the product unit 91 or the die face unit 95, and the second Z coordinate calculation unit 423 adds the extra space 93 to the surplus portion 93. The Z coordinate of the projected feature point 101 is calculated. Since each feature point 101 has an XY coordinate defined in advance, the XYZ coordinate of each feature point 101 is calculated along with the calculation of the Z coordinate.

  Returning to FIG. 2, the draw model generation unit 43 connects the feature points 101 from which the XYZ coordinates are obtained to form a polygon. For example, when adjacent feature points 101 are connected, a triangular polygon 102 can be created (see FIG. 1C). Thereby, the draw model 9 (refer FIG. 7) of the press molded product containing the surplus part 93 in which CAD data does not exist is produced | generated.

[Draw model generation system processing]
5 and 6 are flowcharts showing the processing flow of the draw model generation system 1. As shown in FIG. 5, the draw model is generated by using the preparation process for setting the shape data of the product part 91 and the die face part 95 and the plane lattice 10 and the data prepared in this preparation process. Drawing model generation step. More specifically, the preparation process is composed of processes in steps S1 and S2, and the draw model generation process is composed of processes in steps S3 to S5.

  In step S <b> 1, the worker uses the input device 2 to generate the shape data of the product unit 91 and the die face unit 95 and stores them in the storage device 8. In step S <b> 2, the worker generates the planar grid 10 using the input device 2 and stores it in the storage device 8.

  In step S <b> 3, the coordinate calculation unit 42 projects the planar grid 10 onto the shape data (CAD data) of the product unit 91 and the die face unit 95. Subsequently, in step S4, the coordinate calculation unit 42 performs Z coordinate calculation processing. Here, the Z coordinate calculation process will be described with reference to FIG.

  In step S11, the determination unit 421 determines whether or not the feature point 101 is projected on the CAD plane. Here, the CAD surface refers to the product part 91 and the die face part 95. That is, it is determined whether or not the product portion 91 or the die face portion 95 exists at a position that coincides with the XY coordinates of the feature point 101. If the feature point 101 is projected on the product part 91 or the die face part 95, the determination in step S11 is YES, and the process proceeds to step S12.

  In step S12, the first Z coordinate calculation unit 422 acquires the Z coordinate of the product part 91 or the die face part 95 at the projected position, and moves the process to step S15.

  On the other hand, when it is determined NO in step S11, in step S13, the second Z coordinate calculation unit 423 searches for the surrounding feature point 101 for which the Z coordinate has been calculated. In step S14, the second Z coordinate calculation unit 423 calculates the Z coordinate of the target feature point 101 by weighting the Z coordinates of the surrounding feature points 101 based on the distance. .

  In step S15, the Z coordinate calculated in step S12 or S14 is stored in the storage device 8 in association with the XY coordinates of the feature point 101. Thereafter, processing is performed for all the feature points 101 (step S16), and the Z coordinate calculation processing is terminated.

  Returning to FIG. 5, when the Z coordinates are calculated for all the feature points 101 (that is, the XYZ coordinates are acquired), in step S <b> 5, the draw model generation unit 43 connects the adjacent feature points 101 to a polygon and ends the processing. To do.

  According to this embodiment described above, the following effects can be expected.

(1) In the draw model generation system 1, a plurality of feature points 101 defined by XY coordinates are projected on the shape data of the product portion 91 and the die face portion 95 and coincide with the XY coordinates of the feature points 101. The Z coordinate of the position shape data is calculated as the Z coordinate of the feature point 101. Then, the feature points 101 whose XYZ coordinates are calculated are connected to form a polygon.
Thereby, it is possible to generate a draw model including the surplus part 93 that takes an enormous amount of time to generate. As a result, the weight and the center of gravity of the plate material to be conveyed can be grasped in advance, and the layout design of the conveyance device can be performed prior to the model shape evaluation by CAE.

(2) At this time, if the shape data (the product portion 91 and the die face portion 95) exists at a position that coincides with the XY coordinates of the feature point 101, the Z coordinate of the shape data is used as the Z coordinate of the feature point 101. On the other hand, if there is no shape data (the product part 91 and the die face part 95) at a position that coincides with the XY coordinates of the feature point 101, the feature point is calculated from the Z coordinates of the feature points around the feature point 101. The Z coordinate of 101 is calculated.
Thereby, the shape of the surplus part 93 without shape data can be interpolated, and a draw model including the surplus part 93 can be generated.

(3) Specifically, the draw model generation system 1 uses the Z coordinate of the feature point (peripheral feature point) for which the Z coordinate can be calculated among the feature points around the feature point 101 to be calculated as the feature to be calculated. By performing weighting based on the distance from the point 101 to the peripheral feature point, the Z coordinate of the feature point 101 to be calculated is calculated.
Usually, since the press product has a shape with a certain continuity, the shape of the surplus portion 93 can be generated with a precision of a predetermined level or more by interpolation by weighting based on such a distance. Can do. As a result, parameters such as the weight and the center of gravity of the transported plate material can be acquired appropriately, and the layout design of the transport apparatus can be performed prior to the model shape evaluation by CAE.

  (4) Moreover, in the draw model production | generation system 1, the space | interval of the plane grating | lattice 10 was made into the predetermined space | interval (0.5 mm). As a result, the polygonal bending angle can be kept below θmax, which is preferable.

The preferred embodiment of the draw model generation system 1 of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be modified as appropriate.
For example, in the present embodiment, the feature points 101 are arranged in a grid pattern, but the present invention is not limited to this. That is, the feature points 101 need only have XY coordinates defined, and the present invention can be applied even if they are irregularly arranged.

DESCRIPTION OF SYMBOLS 1 Draw model production system 2 Input device 4 Arithmetic device 41 Plane lattice production | generation part 42 Coordinate calculation part 421 Judgment part 422 1st Z coordinate calculation part 423 2nd Z coordinate calculation part 43 Draw model production | generation part 9 Draw model 91 Product part 93 surplus portion 95 die face portion 10 plane lattice 101 feature point

Claims (8)

A drawing model generation method for generating a draw model of a press-formed product from CAD data having a product part and a die face part,
Generating a plane point group by a plurality of feature points each defined by individual XY coordinates;
Projecting the plane point group onto the CAD data, and calculating a Z coordinate on the CAD data coinciding with an XY coordinate of the feature point as a Z coordinate of the feature point;
And a step of generating a draw model of the press-formed product by connecting the feature points from which the XYZ coordinates are obtained by the above steps to form a polygon. The step of calculating the Z coordinate of the feature point includes:
Determining whether the product part or the die face part exists at a position coinciding with the XY coordinates of the feature points on the CAD data;
When the product part or the die face part exists, calculating the Z coordinate of the product part or the die face part as the Z coordinate of the feature point;
2. The step of calculating the Z coordinate of the feature point from the Z coordinate of the feature point around the feature point when the product part and the die face part do not exist. How to create a draw model.   The step of calculating the Z coordinate of the feature point from the Z coordinate of the peripheral feature point includes the Z coordinate of the peripheral feature point where the product part or the die face part is present among the peripheral feature points of the feature point The drawing model generation method according to claim 2, wherein the Z coordinate of the feature point is calculated by performing weighting on the basis of a distance from the feature point to the peripheral feature point.   The method for generating a draw model according to any one of claims 1 to 3, wherein the step of generating a plane point group arranges a plurality of feature points in a grid at predetermined intervals. A draw model generation system for generating a draw model of a press-formed product from CAD data having a product part and a die face part,
A storage unit for storing a plane point group generated by a plurality of feature points each defined by individual XY coordinates;
A coordinate calculation unit that projects the plane point group onto the CAD data and calculates a Z coordinate on the CAD data that coincides with an XY coordinate of the feature point as a Z coordinate of the feature point;
A draw model generation system comprising: a draw model generation unit configured to generate a draw model of the press-molded product by connecting the feature points whose XYZ coordinates are obtained by the coordinate calculation unit into a polygon. The coordinate calculation unit
A determination unit that determines whether or not the product part or the die face part exists at a position that coincides with the XY coordinates of the feature points on the CAD data;
A first Z-coordinate calculating unit that calculates a Z-coordinate of the product part or the die-face part as a Z-coordinate of the feature point when the product part or the die-face part exists;
A second Z coordinate calculation unit that calculates a Z coordinate of the feature point from a Z coordinate of the feature point around the feature point when the product part and the die face part do not exist The draw model generation system according to claim 5.   The second Z-coordinate calculation unit is configured to convert the feature points from the feature points to the Z-coordinates of the feature points around the feature points where the product part or the die face part exists. The draw model generation system according to claim 6, wherein the Z coordinate of the feature point is calculated by performing weighting based on the distance up to.   The draw model generation system according to any one of claims 5 to 7, wherein the plane point group is generated by arranging a plurality of feature points in a grid at predetermined intervals.

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