JP4826374B2 - Mold design apparatus and program for mold design apparatus - Google Patents

Description

  The present invention relates to a mold design apparatus and a program for a mold design apparatus that design a mold for molding a molded product from three-dimensional shape data of the molded product.

Japanese Patent Laid-Open No. 11-348044

  Conventionally, in the mold design, the designer determines the die cutting direction and the parting line from the three-dimensional shape data of the molded product, and the designer visually determines whether or not there is an undercut. Therefore, in the mold design of a molded product having a complicated shape, there are problems that the design man-hour increases and the undercut is overlooked.

  Therefore, the following technique is disclosed in order to solve the problem that the design man-hour increases in the mold design and the overcut is overlooked.

A normal vector of the surface in the mold created as three-dimensional shape data is obtained, and it is determined that there is a possibility that the normal vector may be undercut with respect to the surface including the component in the mold drawing direction. When the surface is determined to be undercut by the determination means and the determination means and is moved by the movement distance of the mold in the mold removal direction, the molding is performed. The mold design apparatus includes a determination unit that determines that the surface is undercut when it interferes with a product (see Patent Document 1).
According to this example, since it is not necessary for the designer to visually determine the presence and location of the undercut from the mold shape, it is possible to reduce mold design man-hours and mold design mistakes.

  However, in the above prior art, when designing a mold for molding a molded product from the three-dimensional shape data of the molded product, it is possible to automatically determine the presence / absence and location of the undercut. There is a problem that it cannot be determined whether the undercut or the inner undercut is present. In particular, the inner undercut is likely to be overlooked because it exists in the 3D shape data of the molded product, and it is necessary to adopt an inclined pin structure when molding the molded product with a mold. Therefore, it is very important to automatically determine whether or not there is an inner undercut because the restrictions on the mold structure are high and the cost for manufacturing the mold increases.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its object is to design a mold for molding a molded product from the three-dimensional shape data of the molded product. and to provide a mold design apparatus and mold design device program capable of automatically determining the presence and location of the inner undercut when.

That is, the present invention provides virtual line creating means for creating virtual lines in the cavity direction, core direction, and outer undercut direction with respect to points on the surface in the three-dimensional shape data of the molded product, and virtual line creating means Characterized by comprising an inner undercut surface judging means for judging that the surface where the intersection of the virtual line created in step 3 and the three-dimensional shape data of the molded product exists in the direction of all virtual lines is the inner undercut surface. This is a mold design device.
According to the present invention, when designing a mold for molding a molded product from the three-dimensional shape data of the molded product, it is possible to automatically determine the presence / absence and location of the inner undercut, thereby reducing the number of mold design steps and the mold. Mold design errors can be prevented.

  In the present invention, a cavity surface determining means for determining that a surface having no intersection between the imaginary line in the cavity direction and the three-dimensional shape data of the molded product is a cavity surface, and a surface excluding the cavity surface determined by the cavity surface determining means. Core surface determining means for determining a surface that is a face and does not have an intersection between a virtual line in the core direction and the three-dimensional shape data of the molded product as a core surface, cavity surface and core surface determined by the cavity surface determining means A surface excluding the core surface determined by the determination unit and having no intersection between one or more virtual lines in the outer undercut direction and the three-dimensional shape data of the molded product is determined as the outer undercut surface. Outer undercut surface judging means, cavity surface, core surface, outer undercut surface, and inner undercut Comprising display means for identifiably displaying the door surface.

  The present invention also provides virtual line creating means for creating virtual lines in the cavity direction, core direction, and outer undercut direction with respect to points on the surface in the three-dimensional shape data of the molded product, and virtual line creating means The computer functions as an inner undercut surface judging means for judging that the surface where the intersection of the virtual line created in step 3 and the three-dimensional shape data of the molded product exists in the direction of all virtual lines is the inner undercut surface. This is a program for a mold design apparatus characterized by

  In the present invention, a cavity surface determining means for determining that a surface having no intersection between the imaginary line in the cavity direction and the three-dimensional shape data of the molded product is a cavity surface, and a surface excluding the cavity surface determined by the cavity surface determining means. Core surface determining means for determining a surface that is a face and does not have an intersection between a virtual line in the core direction and the three-dimensional shape data of the molded product as a core surface, cavity surface and core surface determined by the cavity surface determining means A surface excluding the core surface determined by the determination unit and having no intersection between one or more virtual lines in the outer undercut direction and the three-dimensional shape data of the molded product is determined as the outer undercut surface. Outer undercut surface judging means, cavity surface, core surface, outer undercut surface, and inner undercut Causing a computer to function as display means for identifiably displaying the door surface.

According to the present invention, when designing a mold for molding a molded product from the three-dimensional shape data of the molded product, it is possible to automatically determine the presence / absence and location of the inner undercut. It is possible to provide a mold design apparatus and a mold design apparatus program that can prevent mold design errors.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 7 are diagrams showing an embodiment of a mold design apparatus and a program for a mold design apparatus according to the present invention.

  FIG. 1 is a block diagram showing a mold design apparatus 10 in the present embodiment.

The mold design apparatus 10 is based on a command input from the input unit 12 of the mold design apparatus 10 and stores a drawing database (three-dimensional shape data of a molded product connected to the mold design apparatus 10). The required 3D shape data of the molded product is read from (not shown). The three-dimensional shape data of the molded product read into the mold design apparatus 10 is stored in a RAM (not shown) of the mold design apparatus 10. The mold design device 10 reads the three-dimensional shape data of the molded product required by the data reader connected to the mold design device 10 from the recording medium storing the three-dimensional shape data of the molded product. It can also be configured as follows. The reading of the three-dimensional shape data of the molded product in the mold design apparatus 10 is controlled by a CPU (not shown) of the mold design apparatus 10. The mold design apparatus 10 reads the three-dimensional shape data of the molded product, and the control program is stored in a ROM (not shown) of the mold design apparatus 10.

  The mold design apparatus 10 receives information related to the mold drawing direction (cavity direction and core direction) from the input unit 12 of the mold design apparatus 10 and, based on the information, mold cutting for the three-dimensional shape data of the molded product. Set the direction. The setting of the mold drawing direction is executed by the CPU of the mold design apparatus 10. In addition, the mold drawing direction setting program is stored in the ROM of the mold design apparatus 10.

  The shape information acquisition calculation unit 14 of the mold design apparatus 10 has shape information (surface information) for forming a 3D shape of the molded product from the 3D shape data of the molded product read into the RAM of the mold design apparatus 10. ) To obtain. The surface (surface) information acquired by the shape information acquisition calculation unit 14 of the mold design apparatus 10 is stored in the surface information storage RAM 16 of the mold design apparatus 10. The calculation in the shape information acquisition calculation unit 14 of the mold design apparatus 10 is executed by the CPU of the mold design apparatus 10. A surface information acquisition program for forming the three-dimensional shape of the molded product is stored in the ROM of the mold design apparatus 10.

  The mold (cavity) surface extraction calculation unit 18 of the mold design apparatus 10 selects one surface stored in the surface information storage RAM 16 of the mold design apparatus 10, and a plurality of points are displayed on the surface. The virtual direction of the cavity direction, the core direction, and the outer undercut direction is created for the plurality of points (virtual line creation means), and the virtual line of the cavity direction and the three-dimensional shape data of the molded product It is determined that a surface having no intersection point is a cavity surface (cavity surface determination means). The cavity surface determined by the cavity surface extraction calculation unit 18 of the mold design apparatus 10 is stored in the RAM 20 for storing cavity (cavity) information. The calculation in the mold surface extraction calculation unit 18 of the mold design apparatus 10 is executed by the CPU of the mold design apparatus 10. A program that causes a CPU (computer) to function as the virtual line creation means and the cavity surface determination means is stored in the ROM of the mold design apparatus 10.

  The core surface extraction calculation unit 22 of the mold design apparatus 10 selects one surface surface excluding the cavity surface determined by the cavity surface extraction calculation unit 18 (cavity surface determination means) of the mold design apparatus 10, and Create multiple points on the surface, create virtual lines in the cavity direction, core direction, and outer undercut direction for the multiple points (virtual line creation means), and form virtual lines in the core direction A surface having no intersection with the three-dimensional shape data of the product is determined as the core surface (core surface determination means). The core surface determined by the core surface extraction calculation unit 22 of the mold design apparatus 10 is stored in the RAM 24 for storing core information. The calculation in the core surface extraction calculation unit 18 of the mold design apparatus 10 is executed by the CPU of the mold design apparatus 10. A program that causes a CPU (computer) to function as the core surface determination means is stored in the ROM of the mold design apparatus 10.

  In the outer slide (outer undercut) surface extraction calculation unit 26 of the mold design device 10, the cavity surface determined by the cavity surface extraction calculation unit 18 (cavity surface determination means) of the mold design device 10 and the mold design device 10. One surface surface excluding the core surface determined by the core surface extraction calculation unit 22 (core surface determination means) is selected, a plurality of points are created on the surface, and the cavity direction is determined with respect to the plurality of points. Create a virtual line in the core direction and the outer undercut direction (virtual line creation means), and create a surface where there is no intersection of one or more virtual lines in the outer undercut direction and the three-dimensional shape data of the molded product The outer undercut surface is determined (outer undercut surface determining means). The outer undercut surface determined by the outer slide surface extraction calculation unit 26 of the mold design apparatus 10 is stored in the RAM 28 for storing outer slide information. The calculation in the outer slide surface extraction calculation unit 26 of the mold design apparatus 10 is executed by the CPU of the mold design apparatus 10. A program that causes a CPU (computer) to function as the outer undercut surface determination means is stored in the ROM of the mold design apparatus 10.

  The inner slide (inner undercut) surface extraction calculation unit 30 of the mold design apparatus 10 is the cavity surface determined by the cavity surface extraction calculation unit 18 (cavity surface determination means) of the mold design apparatus 10. The surface except for the core surface determined by the core surface extraction calculation unit 22 (core surface determination means) and the outer undercut surface determined by the outer slide surface extraction calculation unit 26 (outer undercut surface determination means) of the mold design apparatus 10. The face is determined to be an inner undercut surface (inner undercut surface determination means). The inner undercut surface is a surface in which the intersection of the virtual line created by the virtual line creating means and the three-dimensional shape data of the molded product exists in the direction of all virtual lines. The inner undercut surface determined by the inner slide surface extraction calculation unit 30 of the mold design apparatus 10 is stored in the RAM 32 for storing inner slide information. The calculation in the inner slide surface extraction calculation unit 30 of the mold design apparatus 10 is executed by the CPU of the mold design apparatus 10. A program that causes a CPU (computer) to function as the inner undercut surface determination means is stored in the ROM of the mold design apparatus 10.

  The display unit 34 (display means) of the mold design apparatus 10 includes a cavity surface extraction calculation unit 18, a core surface extraction calculation unit 22, an outer slide surface extraction calculation unit 26, and an inner slide surface extraction calculation unit of the mold design apparatus 10. Each surface extracted at 30 is displayed in an identifiable manner. Note that the display on the display unit 34 of the mold design apparatus 10 is controlled by the CPU of the mold design apparatus 10. A program that causes a CPU (computer) to function as display means is stored in the ROM of the mold design apparatus 10.

  FIG. 2 is a flowchart showing the procedure of mold design in this embodiment.

[Step S100]
First, the mold design apparatus 10 stores three-dimensional shape data of a molded product connected to the mold design apparatus 10 based on a command input from the input unit 12 of the mold design apparatus 10. Read the required 3D shape data from the drawing database.
FIG. 3 is a perspective view showing an example of the three-dimensional shape data of the molded product read by the mold design apparatus 10. In the molded product M, the outer portion of the XY plane cross section that opens in the −Z direction from the central portion is formed in a substantially rectangular box shape. A rectangular opening W is formed in the wall portion in the + Y direction from the center of the molded product M. On the wall portion in the −Y direction from the central portion of the molded product M, a protruding portion B protruding in a rectangular shape is formed.

[Step S102]
Next, the mold design apparatus 10 receives information related to the mold drawing direction (cavity direction and core direction) from the input unit 12 of the mold design apparatus 10, and based on the information, the mold design apparatus 10 applies the three-dimensional shape data of the molded product Set the die removal direction. In the molded product M of FIG. 3, the + Z direction from the center is the cavity direction, and the −Z direction from the center is the core direction.

[Step S104]
Next, the shape information acquisition calculation unit 14 of the mold design apparatus 10 forms surface shape information for forming the three-dimensional shape of the molded product from the three-dimensional shape data of the molded product read into the RAM of the mold design apparatus 10. Is obtained by calculating (reading all surface data of the three-dimensional shape data).

[Step S106]
Next, the mold design apparatus 10 selects (automatically selects) any one surface stored in the RAM 16 for storing surface information of the mold design apparatus 10.

[Step S108]
Next, the mold design apparatus 10 creates a plurality of points on the surface selected in step S106.

[Step S110]
Next, the mold design apparatus 10 creates virtual lines in the cavity direction, the core direction, and the outer undercut (side slide) direction for the plurality of points created in step S108 (virtual line creating means). 3, the + Z direction from the center is the cavity direction, the −Z direction from the center is the core direction, and the ± X direction and ± Y direction from the center are the outer undercut (side slide) directions. is there.
FIG. 4 is a perspective view showing a state in which a virtual line is created on one surface by the virtual line creating means of the mold design apparatus 10 in the molded product M of FIG. In FIG. 4, an imaginary line is created on the outer surface of the wall portion in the + Z direction from the center portion of the molded product M in FIG. 3.

[Step S112]
Next, the cavity surface extraction calculation unit 18 of the mold design apparatus 10 determines whether or not there is an intersection between the virtual line in the cavity direction created in Step S110 and the three-dimensional shape data of the molded product.

[Step S114]
Next, in the case of NO in step S112, it is determined that the surface selected in step S106 is a cavity surface (cavity surface determination means). Then, Step S126 is executed.

[Step S116]
Next, in the case of YES in step S112, there is an intersection of the virtual line in the core direction created in step S110 by the core surface extraction calculation unit 22 of the mold design apparatus 10 and the three-dimensional shape data of the molded product. Whether or not is determined.

[Step S118]
Next, in the case of NO in step S116, it is determined that the surface selected in step S106 is a core surface (core surface determination means). Then, Step S126 is executed.

[Step S120]
Next, in the case of YES in step S116, the outer slide surface extraction calculation unit 26 of the mold design apparatus 10 calculates all the virtual lines in the side surface slide direction created in step S110 and the three-dimensional shape data of the molded product. It is determined whether or not an intersection exists.

[Step S122]
Next, in the case of NO in step S120, it is determined that the surface selected in step S106 is an outer undercut (side slide) surface (outer undercut surface determining means). Then, Step S126 is executed.
FIG. 5 is a ZY plane sectional view showing an example of the outer undercut surface in the molded product M of FIG. FIG. 5 shows that the lower surface of the opening W in the molded product M of FIG. 3 is the outer undercut surface. That is, the imaginary line and the molded product in the cavity direction (+ Z direction), the core direction (−Z direction), and the outer undercut direction (+ Y direction) with respect to the point on the lower surface in the figure of the opening W in the molded product M Although there are intersections with the three-dimensional shape data of M, there are no intersections between the virtual line in the outer undercut direction (−Y direction) and the three-dimensional shape data of the molded product M. In the lower surface of the opening W of the molded product M in the figure, there is an intersection between an imaginary line in the outer undercut direction (± X direction) and the three-dimensional shape data of the molded product M.

[Step S124]
Next, in the case of YES in step S120, it is determined that the surface selected in step S106 is an inner undercut (inner slide) surface (inner undercut surface determination means).
FIG. 6 is a ZY plane sectional view showing an example of the inner undercut surface in the molded product M of FIG. FIG. 6 shows that the upper surface in the drawing of the protrusion B in the molded product M of FIG. 3 is an inner undercut surface. That is, the imaginary lines in the cavity direction (+ Z direction), the core direction (−Z direction), and the outer undercut direction (± Y direction) with respect to a point on the upper surface of the projection B in the molded product M and the molded product There is an intersection with M three-dimensional shape data. In the upper surface of the protrusion B in the figure of the molded product M, there is an intersection between the virtual line in the outer undercut direction (± X direction) and the three-dimensional shape data of the molded product M.

[Step S126]
Next, it is determined whether all the surfaces for which shape information has been acquired in step S104 have been selected in step S106. If NO in step S126, the process returns to step S106. If YES in step S126, this routine ends.

  FIG. 7 is a ZY plane sectional view showing an example of a mold manufactured using the mold design apparatus and the mold design apparatus program according to the present invention. The mold D is roughly composed of a fixed mold FD, a movable mold MD, a side surface slide SD, and an inner slide ID.

  As described above, according to the present embodiment, when designing a mold for molding a molded product from the three-dimensional shape data of the molded product, it is possible to automatically determine the presence / absence and location of the inner undercut, thereby reducing the number of mold design steps. In addition, mold design errors can be prevented.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

FIG. 1 is a block diagram illustrating a mold design apparatus according to an embodiment. FIG. 2 is a flowchart showing a procedure of mold design in the embodiment. FIG. 3 is a perspective view showing an example of three-dimensional shape data of a molded product read by the mold design apparatus. FIG. 4 is a perspective view showing a state in which a virtual line is created on one surface by the virtual line creating means of the mold design apparatus in the molded product of FIG. FIG. 5 is a ZY plane sectional view showing an example of the outer undercut surface in the molded article of FIG. FIG. 6 is a ZY plane sectional view showing an example of the inner undercut surface in the molded product of FIG. 3. FIG. 7 is a ZY plane sectional view showing an example of a mold manufactured using the mold design apparatus and the mold design apparatus program according to the present invention.

Explanation of symbols

10: Mold design device, M: Molded product

Claims (2)

A virtual line generation means for generating a cavity direction, the core direction, and the virtual line of the outer undercut direction to a point on Surface in the three-dimensional shape data of the molded article,
An inner undercut surface determining means for determining that the Surface of intersection of the three-dimensional shape data of the molded article and the virtual line created by the virtual line creating means is present in the direction of all the virtual line is an inner undercut surface ,
Cavity surface judging means for judging that the surface where the intersection of the virtual line in the cavity direction created by the virtual line creating means and the three-dimensional shape data of the molded product does not exist is a cavity surface;
A surface that excludes the cavity surface determined by the cavity surface determination unit and that does not have an intersection between the virtual line in the core direction created by the virtual line creation unit and the three-dimensional shape data of the molded product is represented by the core surface. A core surface judging means for judging that there is,
One or more imaginary lines and the outer undercut direction created by the imaginary line creating means and the surface excluding the cavity face judged by the cavity face judging means and the core face judged by the core surface judging means An outer undercut surface judging means for judging that a surface having no intersection with the three-dimensional shape data is an outer undercut surface;
A mold design apparatus comprising display means for displaying the cavity surface, the core surface, the outer undercut surface, and the inner undercut surface in an identifiable manner. Virtual line creation means for creating virtual lines in the cavity direction, the core direction, and the outer undercut direction with respect to points on the surface in the three-dimensional shape data of the molded product,
Inner undercut surface determining means for determining that the Surface of intersection of the three-dimensional shape data of the molded article and the virtual line created by the virtual line creating means is present in the direction of all the virtual line is an inner undercut surface,
Cavity surface judging means for judging that the surface where the intersection of the virtual line in the cavity direction created by the virtual line creating means and the three-dimensional shape data of the molded product does not exist is a cavity surface,
A surface that excludes the cavity surface determined by the cavity surface determination unit and that does not have an intersection between the virtual line in the core direction created by the virtual line creation unit and the three-dimensional shape data of the molded product is represented by the core surface. Core surface judgment means to judge that there is,
One or more imaginary lines and the outer undercut direction created by the imaginary line creating means and the surface excluding the cavity face judged by the cavity face judging means and the core face judged by the core surface judging means An outer undercut surface judging means for judging that a surface having no intersection with the three-dimensional shape data is an outer undercut surface;
A program for a mold design apparatus, characterized by causing a computer to function as display means for displaying the cavity surface, core surface, outer undercut surface, and inner undercut surface in an identifiable manner.

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