JP4423172B2 - CAD system interference check method - Google Patents

Description

  The present invention relates to a CAD system interference check method for checking interference between a hole shape portion and another model element in a predetermined article model modeled by a CAD system.

  Generally, a CAD system (three-dimensional CAD system) is widely used for designing a mold. By the way, when designing the mold, it is necessary to design a cooling channel pattern that passes between parts such as bolts and ejector pins that exist in the mold, and the cooling channel (hole shape part) and other parts (model) Interference between elements) becomes a problem. For this reason, when a mold is designed, an interference check between the cooling water channel and other parts is usually performed.

Conventionally, as a mold designing method including such an interference check, a cooling water hole designing method in a mold disclosed in JP-A-7-80847 is known. In the method disclosed in the publication, a designer first sets several reference cross sections, creates cooling water hole patterns in the respective reference cross sections, registers them in the CAD system together with the functions of the respective cooling water holes, and molds. The CAD system is instructed on the application range of each pattern to the CAD system, and then the CAD system places the cooling water hole group of each pattern within the application area specified for the pattern in the mold, and then the cooling required by the designer. The cooling water circuit is designed by removing the water holes, and then the CAD system checks whether there is excessive proximity and interference between the cooling water holes of the cooling water circuit and between the cooling water holes and other mold components. Based on the function of the cooling water hole, the flow of the cooling water from the inlet to the outlet of the cooling water circuit is checked for appropriateness and the result is output.
JP-A-7-80847

  However, the above-described conventional interference check method (cooling water hole design method) has the following problems.

  That is, the interference check in a CAD system (three-dimensional CAD system) usually calculates the distance between each surface and other model elements in an arbitrary hole shape part (cooling water hole), and the obtained distance is preset. Therefore, when the number of hole-shaped portions (cooling water holes) is increased or complicated, the time required for the interference check process becomes very long. Eventually, the interference check cannot be speeded up, resulting in a problem that hinders work efficiency related to mold design.

  An object of the present invention is to provide a CAD system interference check method that solves the problems in the background art.

  In the CAD system interference check method according to the present invention, in order to solve the above-described problem, the presence or absence of interference between an arbitrary hole shape portion Faa and other model elements F1 in a predetermined article model modeled by the CAD system M. Is checked, the conversion processing function 221 of the computer main body 2 in the CAD system M uses the parametric function provided in the CAD system M, so that the hole shape portions Faa... Are within a predetermined area of the hole shape portion Faa. A conversion process step (step S3) for converting into a predetermined virtual simple shape part Waa ... having a virtual surface including the maximum outer diameter part Aaa ... and having a reduced number of faces, and a preliminary check processing function 22 of the computer main body 2 , The virtual simple shape portion Waa... And other model elements F1... Are compared to check for interference. When the check processing step (steps S4 and S5) and the preliminary check processing step (steps S4 and S5) are completed, the virtual simple shape portion Waa... When the check results of the return processing step (step S8) for returning to Faa... And the preliminary check processing steps (steps S4 and S5) have interference, the main check processing function 23 of the computer main body 2 causes the return processing step (step A main check processing step (steps S9 and S10) for checking the presence / absence of interference by comparing the hole shape portion Faa with interference returned by S8) with another model element F1.

  Moreover, the CAD system interference check method according to another aspect of the present invention solves the above-described problem by using an arbitrary hole-shaped portion Faa in a predetermined article model modeled by the CAD system M and other model elements. When checking the presence or absence of interference of F1..., The determination processing function 21 of the computer main body 2 in the CAD system M causes the hole shape portion Faa... To be the maximum outer diameter portion Aaa. A hole shape determination processing step (step S2) for determining whether or not the hole shape portion is converted into a predetermined virtual simple shape portion Waa. When it is determined to belong in the determination processing step (step S2), the hole shape portion Faa. The virtual simple shape portion Waa and other model elements F1 are compared and checked for interference by the conversion processing step (step S3) for conversion into the shape portions Waa... And the preliminary check processing function 22 of the computer main body 2. When the preliminary check processing step (steps S4 and S5) and the preliminary check processing step (steps S4 and S5) are completed, the return processing function 222 of the computer main body 2 converts the virtual simple shape portion Waa. When the check results of the return processing step (step S8) for returning to Faa... And the preliminary check processing steps (steps S4 and S5) have interference, the main check processing function 23 of the computer main body 2 causes the return processing step (step The presence or absence of interference is compared by comparing the hole-shaped portion Faa with interference returned by S8) with another model element F1. Characterized in that it comprises a main check process (step S9, S10) for Ekku.

  Furthermore, in the CAD system interference check method according to another aspect of the present invention, in order to solve the above-described problem, interference between an arbitrary hole shape portion and another model element in a predetermined article model modeled by the CAD system M is achieved. In the CAD system interference check method for checking the presence or absence of a hole, the hole shape portion Faa... Is converted into a maximum outer diameter portion Aaa... Within a predetermined region of the hole shape portion Faa. The virtual simple shape portion Waa... Is converted into a predetermined virtual simple shape portion Waa... Having a virtual surface and the number of faces is reduced, and the preliminary check processing function 22 of the computer main body 2 is used. Are compared with other model elements F1 to check for the presence of interference and allow preset interference. When the preliminary check processing steps (steps S4 and S5) having a cancel function for canceling the check on the other model elements F1 and the preliminary check processing steps (steps S4 and S5) are completed, the computer main body 2 is restored. When the check results of the return processing step (step S8) and the preliminary check processing steps (steps S4 and S5) in which the virtual simple shape portions Waa... Are returned to the original hole shape portions Faa. The main check processing function 23 of the computer main body 2 checks the presence or absence of interference by comparing the hole shape portion Faa with interference returned by the return processing step (step S8) with the other model elements F1. Cancel to cancel the check against other model elements F1 that allow the set interference Characterized in that it comprises a main check processing step having a capacity (step S9, S10).

  On the other hand, according to a preferred embodiment of the present invention, the article model can be applied to the mold model Fo, and the hole-shaped portion Faa ... has a simple hole Fx drawn in the straight direction with the same diameter, the simple hole Fx ... One or a combination of two or more of tap prepared holes Fy... Provided at one end or both ends of taps and tap holes Fz provided in the tap prepared holes Fy. The maximum outer diameter portion Aaa ... has a primary maximum outer diameter portion directly obtained from the hole-shaped portion Faa ... or a secondary maximum outer diameter portion obtained by adding a preset correction value to the primary maximum outer diameter portion. Can be included.

  According to the interference check method of the CAD system according to the present invention based on such a method, the following remarkable effects can be obtained.

  (1) Even if the hole shape portion Faa ... has a large number of faces, it can be converted into a virtual simple shape portion Waa ... to greatly reduce the number of faces, so that the number of hole shape portions Faa ... increases or becomes complicated. Even in such a case, it is possible to reduce the time required for the interference check, to increase the speed of the interference check, and further to improve the efficiency of the design work.

  (2) It can be implemented with relatively simple software and can contribute to ease of implementation and cost reduction, and can be applied to existing CAD systems by adding software.

  (3) A predetermined virtual simple shape portion Waa ... having a virtual surface including the maximum outer diameter portion Aaa ... in a predetermined region of the hole shape portion Faa ... and having a reduced number of surfaces. Since the conversion processing step for converting to CAD is performed using the parametric function provided in the CAD system M, the existing function in the CAD system M can be used to contribute to further ease of implementation and cost reduction. .

  (4) Predetermined virtual simple shape portion Waa ... in which the hole shape portion Faa ... has a virtual surface including the maximum outer diameter portion Aaa ... in a predetermined region of the hole shape portion Faa ... and the number of faces is reduced. A hole shape determination processing step for determining whether or not the hole shape portion to be converted into a hole shape portion is provided, and when the hole shape portion belongs, the conversion processing step is performed, so that the hole shape portion effective for conversion into the virtual simple shape portion Waa. By selecting only Faa..., More efficient conversion processing can be performed.

  (5) Since the preliminary check processing step and the main check processing step are provided with a cancel function for canceling the check with respect to the other model elements F1 that allow the preset interference, a more accurate check can be avoided. Interference check can be performed.

  (6) According to a preferred embodiment, the article model is applied to the mold model Fo as the article model, and the hole shape portion Faa... Is a simple hole Fx drawn in the linear direction with the same diameter, one end or both ends of the simple hole Fx. If one or a combination of two or more tap holes Fz ... provided in the tap pilot holes Fy ..., and tap taps Fz ... provided in the tap pilot holes Fy ... are included, it is particularly effective for improving the efficiency and facilitation of the mold design. Can contribute.

  (7) According to a preferred embodiment, as the maximum outer diameter portion Aaa, a secondary maximum outer diameter portion obtained by adding a preset correction value to the primary maximum outer diameter portion directly obtained from the hole-shaped portion Faa ... is used. For example, the reliability of the interference check can be increased corresponding to the complexity and arrangement density of the arbitrary hole-shaped portions Faa... And the other model elements F1. By selecting the correction value, it is possible to realize an optimal interference check for the article model.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, an overview of a CAD system M that can implement the CAD system interference check method according to the present embodiment will be described with reference to a functional block diagram shown in FIG.

  An exemplary CAD system M is a three-dimensional CAD system, and includes a computer main body 2 that executes various processes. The computer main body 2 includes input devices such as a mouse 3 and a keyboard 4, and a display 5 and a printer 6. Etc. are connected. On the other hand, the computer main body 2 includes a memory 11 for storing various computer programs including a processing program Ps for executing the interference check method according to the present embodiment, and a database 12 for storing model data. In this case, the memory 11 also functions as a system memory used for storing various data. The computer body 2 includes various functions associated with execution of the processing program Ps, that is, a determination processing function 21, a preliminary check processing function 22, a main check processing function 23, a reference setting function 24, a check result processing function 25, and the like. The preliminary check processing function 22 includes a conversion processing function 221, an arithmetic processing function 222, a preliminary determination processing function 223, a return processing function 224, and the like. Details of each function will be described in the description of the interference check method according to the present embodiment described later.

  Next, the CAD system interference check method according to the present embodiment will be specifically described with reference to FIGS.

  First, an outline of the interference check method according to the present embodiment will be described. FIG. 3 shows a mold model Fo related to a part of a mold created using the CAD system M. In the mold model Fo, Faa is a hole-shaped portion constituting the cooling water channel. This hole-shaped portion Faa is a combination of three different types of holes, a simple hole Fx drawn in the linear direction with the same diameter, and tap lower holes Fy, Fy provided at both ends of the simple hole Fx, The tap holes Fz and Fz provided in the tap pilot holes Fy and Fy are included. Further, the mold model Fo has two model elements (hole shape portions) F1 and F2 other than the cooling water channel. And the hole shape part Faa which comprises a cooling water channel becomes an interference check object in the metal mold | die model Fo.

  Incidentally, as shown in FIG. 4, there are four kinds of standard hole shape portions Fa, Fb, Fc, Fd in the hole shape portion related to the cooling water channel, and each hole shape portion Fa, Fb, Fc, The number of faces on the model for Fd is as shown in the table of FIG. That is, the first hole-shaped portion Fa is the same as the hole-shaped portion Faa shown in FIG. 3, and referring to FIG. 3, the simple hole Fx having both ends open, and the taps provided at both ends of the simple hole Fx. By including the tap holes Fz and Fz provided in the holes Fy and Fy and the respective tap lower holes Fy and Fy, a plurality of steps are generated in the hole-shaped portion Faa, so the number of faces on the model is “18”. . Referring to FIG. 3, the second hole-shaped portion Fb includes a simple hole Fx having one end opened, a tap pilot hole Fy provided at one end of the simple hole Fx, and a tap hole Fz provided in the tap pilot hole Fy. Therefore, the number of faces on the model is “12”. Referring to FIG. 3, the third hole shape portion Fc is only the simple hole Fx that is open at both ends, so the number of surfaces on the model is “2”. Referring to FIG. 3, the fourth hole shape portion Fd is only a simple hole Fx that is open at one end, so the number of faces on the model is “4”.

  On the other hand, in a CAD system (three-dimensional CAD system) M, an assembled part and a part interference check function are usually provided as standard functions. However, regarding the hole-to-hole interference check, the standard function cannot be checked, and it is often prepared exclusively as an exclusive function (optional function). Then, in the interference check method in this case, taking the mold model Fo of FIG. 3 as an example, the distance between each surface of the hole-shaped portion Faa and the other model elements F1,... Is calculated, and the calculated distance is an allowable value. The presence or absence of interference is determined based on whether or not the distance exceeds. Therefore, the number of times of calculation and determination of the distance between the hole shape portion Faa and the model element F1 in the mold model Fo illustrated in FIG. 3 is 18 × 4 = 72 times from the hole shape portions Fa and Fd shown in FIG. Become.

  As described above, when a general interference check method is used, as the number of surfaces of each hole-shaped portion Fa ... increases, the interference check time becomes longer and the number of surfaces of each hole-shaped portion Fa ... decreases. The longer the interference check time is, the shorter it is. In the interference check method according to the present embodiment, when performing the interference check, in particular, the hole shape portion Fa with a large number of steps having a number of steps is reduced and simplified using a virtual surface, The principle of reducing the number of distance calculation and determination processes is used.

  Hereinafter, a specific processing procedure of the interference check method according to the present embodiment will be described according to the flowchart shown in FIG.

  A mold model Fo shown in FIG. 3 is used as a target model for the interference check. Therefore, in this case, the mold model Fo is displayed on the display 5. In addition, various conditions are set in advance for the interference check. In the reference setting function 24, an allowable value (preliminary allowable value) for determining the presence / absence of interference in a preliminary check processing function 22 (to be described later) is set, and in order to determine the presence / absence of interference in a main check processing function 23 (to be described later). Set the tolerance value (main tolerance value). On the other hand, in this embodiment, since a cancel function for canceling the check is provided for the other model elements F1,... That allow preset interference, a model element for canceling the check is set. In the case of the example, since the interference check is performed on the hole shape portion Faa related to the cooling water channel, if a model element (hole shape portion) related to the same type of cooling water channel exists, the condition is set as a model element for canceling the check. To do. With such a cancel function, it is possible to avoid an erroneous check and perform a more accurate interference check. Furthermore, when the hole-shaped portions Fc and Fd shown in FIG. 4 exist, these model elements (hole-shaped portions Fc and Fd) have a simple shape with a small number of surfaces, and thus no further simplification is required. The condition is set as a model element that does not perform a preliminary processing step described later.

  When the check process is performed, the mouse 3 or the keyboard 4 is used to select the interference check mode from the function keys. Thereby, the hole shape portion Faa to be checked is automatically designated (step S1). If the hole shape portion Faa is designated, the designated hole shape portion is a model element (hole shape portion Fc, Fd) for canceling a preset check by the judgment processing function 21 (hole shape judgment processing step). It is determined whether or not there is (step S2). As a result, when the designated hole shape portion corresponds to the model element (hole shape portion Fc, Fd) for canceling the set check, the preliminary processing step is canceled and main processing from step S9 described later is performed. A process is performed. Thus, in the hole shape determination processing step, it is determined whether or not the hole shape portion Faa belongs to a hole shape portion to be converted to a virtual simple shape portion Waa described later, and is converted only when it belongs to the hole shape portion to be converted. Since the processing steps are performed, more efficient conversion processing can be performed by selecting only the hole shape portions Faa... Effective for conversion to the virtual simple shape portions Waa. On the other hand, if the designated hole shape portion does not correspond to a model element (hole shape portion Fc, Fd) for canceling a preset check, a preliminary check is performed in the preliminary processing step. In the example, since the hole shape portion Faa does not correspond to the model element to be canceled (hole shape portions Fc, Fd), the preliminary check processing function 22 performs the preliminary processing step.

  In the preliminary check processing function 22, first, by the conversion processing function 221 (conversion processing step), the hole shape portion Faa has a virtual surface including the maximum outer diameter portions Aaa and Aaa within a predetermined region of the hole shape portion Faa. And it converts into the predetermined virtual simple shape part Waa which reduced the number of surfaces (step S3). This conversion process can use a parametric function (a function for arbitrarily changing dimension data) provided as a standard in a general CAD system M. Thus, since the conversion process to the virtual simple shape part Waa can utilize the existing function in the CAD system M, there is an advantage that it can contribute to the implementation and cost reduction. In the case of the example, the predetermined regions are the left region and the right region of the hole-shaped portion Faa, and the virtual surface includes two maximum outer diameter portions Aaa and Aaa on the left and right. Each maximum outer diameter portion Aaa, Aaa becomes an outer peripheral surface of tap holes Fz, Fz provided at both ends of the hole shape portion Faa, and the hole shape portion Faa is formed by a virtual surface connecting the maximum outer diameter portions Aaa, Aaa. It is converted into a virtual simple shape portion Waa having the same shape as the hole shape portion Fc shown in FIG. In the present invention, the virtual surface including the maximum outer diameter portions Aaa... Is provided on the condition that all the hole-shaped portions Faa. In FIG. 5A, the hole shape portion Faa before conversion is indicated by a virtual line, and the virtual simple shape portion Waa after conversion is indicated by a solid line. Moreover, only the virtual simple shape portion Waa is clearly shown in FIG. As is apparent from FIG. 5B, the number of faces on the model of the virtual simple shape portion Waa is “2”.

  In this case, as the maximum outer diameter portion Aaa..., The maximum outer diameter portion (primary maximum outer diameter portion) obtained directly from the hole shape portion Faa... Is used. A secondary maximum outer diameter portion obtained by adding a value can also be used. By using the secondary maximum outer diameter portion, it is possible to increase the reliability of the interference check corresponding to the complexity and arrangement density of the arbitrary hole shape portion Faa ... and other model elements F1 ... in the mold model Fo. In addition, there is an advantage that an optimum interference check can be realized for the mold model Fo by selecting a correction value corresponding to the type of the article model.

  Next, the process proceeds to a preliminary check process. In the preliminary check processing step, the arithmetic processing function 222 calculates the distance between each surface of the virtual simple shape portion Waa and the other model elements F1 (step S4). In this case, the number of times of calculation of the distance between the virtual simple shape portion Waa and the model element F1 is 2 × 4 = 8 times, which is reduced to 1/9 compared to 72 times when the hole shape portion Faa is used as it is. be able to. Then, the preliminary determination processing function 223 makes a preliminary determination as to whether or not the calculated distance value exceeds a preset allowable value (preliminary allowable value) (step S5). If it is determined that there is no interference in the preliminary determination, a process without interference is performed (step S6). In the no interference processing in this case, the virtual simple shape portion Waa is returned to the original hole shape portion Faa, and a message display related to no interference is performed. Therefore, at this point, the interference check for the hole-shaped portion Faa is actually finished.

  On the other hand, when it is determined by the preliminary determination that there is interference, the interfering surface is temporarily stored in the memory 11 (step S7). In the example, as shown in FIG. 5, an interference state in which the virtual simple shape portion Waa and a part of the model element F1 overlap each other is illustrated. When the preliminary determination for the virtual simple shape portion Waa is completed, the virtual simple shape portion Waa is returned to the original hole shape portion Faa by the return processing function 224 (return processing step) (step S8). Thereby, the preliminary processing step is completed, and the process proceeds to the main processing step.

  In the main processing step, the main check processing function 23 calculates the distance between the surface determined as having interference by the preliminary determination temporarily stored in the memory 11 and the other model element F1 (step S9). In this case, the calculation of the distance is sufficient only for the surface determined to have interference by the preliminary determination. Then, a main determination is made as to whether or not the calculated distance value exceeds a preset allowable value (main allowable value) (step S10). If it is determined by the main determination that there is no interference, an interference-free process is performed (step S6). In this case, the no interference process displays a message related to no interference.

  On the other hand, if it is determined by the main determination that there is interference, the check result processing function 25 performs processing with interference (step S11). Specifically, the color change processing (highlight processing) of the interfering hole shape portion Faa is performed, and for example, processing such as changing the line color displayed on the display 5 from black to red is performed. If necessary, display a message related to the presence of interference. Thereby, the main processing step is completed.

  Thus, the interference check for the hole-shaped portion Faa is completed. Although the illustrated hole shape portion Faa is one, generally there are a large number of hole shape portions (Faa, Fab, Fac, etc.), and therefore other hole shape portions for further interference check remain. In this case, the designation is sequentially performed, and the same interference check process is performed (steps S12, S1,.

  In the case of the hole shape portion Fba (hole shape portion Fb shown in FIG. 4) having only one end opened as shown in FIG. 6, the maximum outer diameter portion Aba occurs only at one end of the hole shape portion Fba. It can convert into the virtual simple shape part Wba which has the virtual surface which passes along the largest outer-diameter part Aba. At this time, the other end of the virtual simple shape portion Wba can be converted so as to have a similar shape to the other end of the hole shape portion Fba. In this case, even if the number of faces of the hole-shaped portion Fba is “12”, the number of faces of the virtual simple shape portion Wba is “4”, which can be reduced to 1/3.

  Therefore, according to the interference check method of the CAD system according to this embodiment, even the hole shape portion Faa ... having a large number of surfaces is converted into the virtual simple shape portion Waa ... to greatly reduce the number of surfaces. Therefore, even when the number of hole-shaped portions Faa ... is increased or complicated, the time required for the interference check can be shortened, the interference check can be speeded up, and the efficiency of the design work can be improved. Can be achieved. In addition, it can be implemented with relatively simple software and can contribute to ease of implementation and cost reduction, and can be applied to an existing CAD system by adding software. In particular, as the hole-shaped portion Faa ..., a simple hole Fx drawn in the linear direction with the same diameter, a tap pilot hole Fy provided at one or both ends of the simple hole Fx, a tap provided in the tap pilot hole Fy ... If applied to the mold model Fo including the holes Fz..., It can contribute to the efficiency and facilitation of the mold design.

  The best embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the scope of the present invention is not deviated from the gist of the present invention in detail configuration, quantity, technique, application, and the like. It can be changed, added, or deleted arbitrarily.

  For example, in the illustrated embodiment, the mold model Fo is exemplified as the article model. However, the embodiment can be similarly applied to an article model having a similar content other than the mold (such as a machine part model) and has a hole shape. Although the cooling water channel is illustrated as the portion Faa ..., it can be similarly applied to various hole-shaped portions such as an oil passage and an air passage. Moreover, although the hole-shaped part was illustrated as another model element F1, F2, ..., various parts, a plate surface, etc. are applicable similarly. Before the conversion processing step, it is determined whether or not the hole shape portions Faa ... belong to the hole shape portion to be converted into the virtual simple shape portion Waa ..., and the conversion processing step is performed only when belonging to the hole shape portion to be converted. Although the case where the hole shape determination processing step to be performed is provided has been shown, whether or not to provide this hole shape determination processing step is arbitrary. Furthermore, although the case where the parametric function provided in the CAD system M is used as the conversion processing step is shown, a dedicated processing program for performing the conversion processing step may be added.

The flowchart which shows the process sequence of the interference check method which concerns on the best embodiment of this invention, Functional block diagram of a CAD system that can implement the interference check method, Blueprint of a mold model that performs interference check using the same interference check method, Table showing types of hole shape parts used in the interference check method, A design drawing of a mold model in which the hole shape part is converted into a virtual simple shape part by the interference check method, Explanatory drawing for converting another hole shape part into a virtual simple shape part by the interference check method,

  2: computer main body, 21: determination processing function, 22: preliminary check processing function, 221: conversion processing function, 222: return processing function, 23: main check processing function, M: CAD system, Faa ...: hole shape portion, F1 ...: Other model elements, Fo: Mold model (article model), Fx ...: Simple hole, Fy ...: Tap pilot hole, Fz ...: Tap hole, Aaa ...: Maximum outer diameter part, Waa ...: Virtual simple shape Part, S2: hole shape determination processing step, S3: conversion processing step, S4: preliminary check processing step, S5: preliminary check processing step, S8: return processing step, S9: main check processing step, S10: main check processing step

Claims (8)

  In a CAD system interference check method for checking the presence or absence of interference between an arbitrary hole shape portion and another model element in a predetermined article model modeled by a CAD system, the conversion processing function of the computer main body in the CAD system allows the CAD Utilizing a parametric function provided in the system, the hole shape portion has a virtual surface including a maximum outer diameter portion in a predetermined region of the hole shape portion, and a predetermined virtual simple shape portion having a reduced number of surfaces. A conversion processing step for conversion, a preliminary check processing step for checking the presence or absence of interference by comparing the virtual simple shape portion and the other model elements by a preliminary check processing function of the computer main body, and this preliminary check processing step When finished, the virtual simple shape portion is restored by the return processing function of the computer body. When there is interference between the return processing step for returning to the original hole shape portion and the check result of the preliminary check processing step, the hole shape with interference returned by the return processing step by the main check processing function of the computer main body And a main check processing step of checking the presence or absence of interference by comparing the unit with other model elements.   The hole-shaped portion includes one or more of a simple hole drawn in a straight line with the same diameter, a tap pilot hole provided at one or both ends of the simple hole, and a tap hole provided in the tap pilot hole. The CAD system interference check method according to claim 1, further comprising a combination.   The maximum outer diameter portion is a secondary maximum outer diameter obtained by adding a preset correction value to a primary maximum outer diameter portion obtained directly from the hole shape portion or a primary maximum outer diameter portion obtained directly from the hole shape portion. 2. The CAD system interference check method according to claim 1, wherein the interference check method is a diameter portion.   2. The CAD system interference check method according to claim 1, wherein the article model is a mold model.   In the interference check method of a CAD system for checking the presence or absence of interference between an arbitrary hole shape portion in a predetermined article model modeled by a CAD system and other model elements, the hole is determined by the determination processing function of the computer main body in the CAD system. Whether or not the shape portion belongs to a hole shape portion that has a virtual surface including the maximum outer diameter portion in a predetermined region of the hole shape portion and is converted into a predetermined virtual simple shape portion having a reduced number of surfaces. A hole shape determination processing step for determining, and a conversion processing step for converting the hole shape portion into the virtual simple shape portion by the conversion processing function of the computer body when it is determined that the hole shape determination processing step belongs, Preliminary check processing function of the computer main body compares the virtual simple shape portion with the other model elements to check for interference. A preliminary check processing step to be checked, a return processing step for returning the virtual simple shape portion to the original hole shape portion by the return processing function of the computer main body when the preliminary check processing step is completed, and the preliminary check processing When the check result of the process has interference, the main check processing function of the computer main body compares the hole shape portion with interference returned by the return processing step with other model elements to check for interference. A CAD system interference check method comprising: a check processing step.   The hole-shaped portion includes one or more of a simple hole drawn in a straight line with the same diameter, a tap pilot hole provided at one or both ends of the simple hole, and a tap hole provided in the tap pilot hole. The CAD system interference check method according to claim 5, further comprising a combination.   The maximum outer diameter portion is a secondary maximum outer diameter obtained by adding a preset correction value to a primary maximum outer diameter portion obtained directly from the hole shape portion or a primary maximum outer diameter portion obtained directly from the hole shape portion. The CAD system interference check method according to claim 5, wherein the interference check method is a diameter portion.   In the interference check method of a CAD system for checking the presence or absence of interference between an arbitrary hole shape portion and another model element in a predetermined article model modeled by a CAD system, the conversion processing function of the computer main body in the CAD system enables the hole A conversion processing step for converting the shape portion into a predetermined virtual simple shape portion having a virtual surface including a maximum outer diameter portion in a predetermined region of the hole shape portion and having a reduced number of surfaces; The preliminary check processing function compares the virtual simple shape portion with the other model elements to check for interference, and has a cancel function for canceling the check for other model elements that allow preset interference. If the preliminary check processing step has been completed and the preliminary check processing step has been completed, When the check result of the preliminary check processing step is interfered with the return processing step of returning the virtual simple shape portion to the original hole shape portion by the return processing function of the data main body, the main check processing of the computer main body The function checks the presence / absence of interference by comparing the hole shape part with interference restored by the restoration processing step with other model elements, and cancels the check for other model elements that allow preset interference. And a main check processing step having a cancel function for performing an interference check method for a CAD system.

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