Patent Application
20200334399
This application claims priority to Japanese Patent Application No. 2019-079931 filed on Apr. 19, 2019, the entire contents of which are incorporated by reference herein.
The present invention relates to a design support system, a design verification method, and a design verification program.
In product design, three-dimensional CAD (Computer Aided Design) has become widespread. The three-dimensional CAD (hereinafter, referred to as 3D CAD) is a tool for designing parts and members designed by designers as a three-dimensional model in 3D space, and is used in the design departments of many companies. However, in 3D CAD, a virtual three-dimensional model can be created freely on a computer while a designer must design a part shape while observing many rules. For example, in a case where a plate-shaped component made of resin is a material, even if the thickness of the plate-shaped component can be set freely on 3D CAD, if it is too thick, it will not be cooled uniformly in the molding process, and problems will easily occur in the manufacturing process. For this reason, in product design, for example, there is a rule that “in resin design, the thickness must be created within a certain range”. The rules that the designer should follow are called design requirements herein.
If a design drawing is created without correctly understanding such design requirements and a defect is discovered in the manufacturing process, a redesign for correction occurs, causing a delay in commercialization. Non-Patent Document 1 (MASAYUKI HARIYA et al. “Development of Design Awareness Support System” Proceedings of 22nd Design Engineering and System Division Lecture Meeting of the Japan Society of Mechanical Engineers (2012.9.26-28)) and Non-Patent Document 2 (HARIYA, M. et al., “Technique for Checking Design Rules for Three-Dimensional CAD Data”, Proc. IEEE Conf. Computer Science and Information Technology (ICCSIT), pp. 296-300, 2010) disclose support systems for making designers aware of past product design knowledge from the initial stage of design. In many cases, the 3D-CAD data has only shape information (three-dimensional model) of designed parts and the like. On the other hand, the design requirements are defined as the size and arrangement of characteristic shapes (for example, ribs and bosses in molded products, punched holes and bending in sheet metal processing). For this reason, Non-Patent Document 1 and Non-Patent Document 2 disclose systems that automatically identify locations corresponding to the design requirements from the 3D-CAD data by shape recognition from a three-dimensional model of 3D CAD and automatically collate with the design requirements.
If design verification of 3D-CAD data can be performed on a computer as well as design using 3D CAD, the quality of design using 3D CAD can be improved. Herein, it is a matter of course that the design requirements applied to the design target is correctly reflected on a design target. However, in general, such design requirements are not necessarily systematically organized and managed at the design site. Further, in a case where the design target is a part or member having a complicated shape such as an aircraft or an automobile, there may be thousands to hundreds of thousands of design requirements. In addition, the design requirements are reviewed from time to time due to quality improvement activities and changes in regulations by laws.
Therefore, if a verification program is created one by one according to the design requirements, it is difficult to construct and update the design verification system. A bottleneck is that a designer who is familiar with the design requirements does not always have sufficient knowledge and experience about programming.
In order to eliminate re-work from a manufacturing stage to a design stage, it should be made sure that important design requirements for the design target be covered and checked. In addition, it is necessary to establish design support systems and environments that are easy to maintain according to changes in the design requirements.
The present invention has been made in view of these problems, and an object thereof is to propose a design support system that enables a computer to verify a 3D-CAD design while responding to a vast amount of design requirements and responding to changes in design requirements.
A design support system according to an aspect of the present invention is a design support system that verifies whether 3D-CAD data satisfies design requirements, and includes a common module database which stores a plurality of common modules to perform a process on 3D-CAD data or a feature amount extracted from the 3D-CAD data, a rule file database which stores a plurality of rule files for defining a procedure for obtaining a verification feature amount for verifying a design requirement from the 3D-CAD data, and violation information for determining whether the design requirement based on the verification feature amount is violated using a common module stored in the common module database, and a design support apparatus. When a first rule file corresponding to the design requirement to be verified with respect to predetermined 3D-CAD data is selected from the rule file database, the design support apparatus calls a common module stored in the common module database according to the procedure defined in the first rule file and executes the common module on the predetermined 3D-CAD data, and determines whether the design requirement corresponding to the first rule file is violated on the basis of the violation information defined in the first rule file and the verification feature amount obtained according to the procedure.
According to the invention, a design support system is realized which enables verification of 3D-CAD design by a computer while responding to enormous design requirements and changing design requirements.
Other objects and novel features will become apparent from the description of the specification and the accompanying drawings.
The design support system 520 includes a design support apparatus 521 that verifies whether the 3D-CAD data designed by the design apparatus 501 using 3D CAD satisfies design requirements applied to the design target. The design requirement database 522 stores design requirements requested by a design department or a designer to comply with the design target. The design requirement may be determined individually for each design target, or may be determined commonly for many design targets. In addition, although an example in which a database is created as an electronic file is illustrated herein, the design requirement that is made into a rule file may be a design requirement that is stored by a paper medium or as know-how. Regardless of the medium in which the design requirements are stored, the design support apparatus 521 of this embodiment drops the design requirements into a rule file (definition document) stored in the rule file database 524, and verifies the 3D-CAD data according to a procedure specified in the rule file to check whether the designed three-dimensional model violates the design requirements. Although details will be described later, in this embodiment, the 3D-CAD data is verified by applying the common module (program) stored in the common module database 523 according to the rule file.
The design system 500 and the design support system 520 are preferably connected via a network 510.
The auxiliary memory 603 stores a rule file creation program 621 and a design verification program 622. These programs may be stored in an optical recording medium such as a CD or a DVD via an optical drive connected to the I/O port 607, or stored in a magnetic recording medium via an external HDD. The program stored in the magnetic recording medium may be stored in the auxiliary memory 603 through an external HDD, or may be stored in the auxiliary memory 603 via the network 510. In the auxiliary memory 603, 3D-CAD data 624 (design target) as a verification target, a rule file 623 for defining a verification procedure for design requirements, and a common module 625 are stored as data or programs used by the rule file creation program 621 or the design verification program 622. The 3D-CAD data 624 is called from the 3D-CAD DB 502 and stored, the rule file 623 is called from the rule file DB 524, and the common module 625 is called from the common module DB 523 and stored. Further, in this embodiment, the functions of the design support apparatus 521 are realized in cooperation with other hardware by executing a program stored in the auxiliary memory 603 by the processor 601. A program executed by a computer, a function or means for realizing the function may be referred to as “function”, “unit”, “module”, or the like.
Hereinafter, the description will be given about a rule file creation process for dropping design requirements into a rule file and a design verification process for verifying whether a three-dimensional model designed by 3D CAD using the rule file and the common module satisfies the design requirements.
(1) Rule File Creation Process
In this embodiment, the rule file creation process is realized by the design support apparatus 521 executing the rule file creation program 621. As described above, in the rule file creation process, a rule file that defines the procedure for verifying the shape information of 3D CAD is generated from the design requirements held in various media in the design department. In general, the design requirements only describe the contents to be observed by the design target (parts, members). In order to identify a violation location from the shape information, the logic to extract the check location from the 3D-CAD data and a determination criterion for determining a violation are necessarily defined as a procedure. With this configuration, the designer can verify enormous design requirements on various media on the design support system 520 for the 3D-CAD data.
The rule file creation program 621 includes a basic information setting unit 631, a logic setting unit 632, a violation information setting unit 633, and a format check unit 634.
Hereinafter, the description will be given about an example of creating a rule file for the pitch of holes provided in a sheet metal part.
When the designer clicks the information setting button 202, the basic information setting unit 631 opens basic information boxes 301 to 304 for setting rule basic information (S101). The rule file creation screen 201 in this state is illustrated in
When the designer clicks the information setting button 203, the logic setting unit 632 opens a procedure box 311 for setting the rule execution processing procedure information (S102).
In Step S102, the designer drops the procedure for extracting the verification part (feature shape) related to the design requirement from the 3D-CAD data into the procedure using the common module. Further, by clicking a procedure add button 312 as needed, the procedure box 311 is additionally opened, and the number of procedures to be set can be increased. When the common module list call button 310 is clicked, a list of registered common modules is displayed.
An example of the common module list screen 320 is illustrated in
The common modules exemplified in the common module list screen 320 in
By the way, it is desirable that the content of the procedure to be a common module should be versatile in order to be applicable to a wide variety of three-dimensional models, and specific enough to allow the designer to recognize the process as having a certain degree of unity. In addition, in many cases, the next-stage common module may be processed using the processing result of the previous-stage common module as an input. Therefore, the common modules of this embodiment each have input/output parameters, and it is necessary to set input/output parameters of each common module in accordance with the contents of the design requirements.
When the designer clicks the information setting button 204, the logic setting unit 632 opens a setting box 330 for setting module input/output information (S103).
For example, in Procedure 1 “AF: Attribute Acquisition”, the database 503 accumulating attribute information linked to the 3D-CAD data is referred by specifying four input parameters, and information for narrowing down the feature shape is output with two output parameters. In Procedure 2 “AC: Hole”, the two input parameters from Procedure 1 are used, and the hole information included in the three-dimensional model is output with one output parameter. In Procedure 3 “09: Arc Center”, the hole is designated by three input parameters, and the center of the hole is output with three output parameters. The input parameters of Procedure 3 include the output parameters of Procedure 2. In Procedure 4 “01: Point-to-point Distance”, two points for measuring the distance are designated by two input parameters, and the distance between the designated points and the distance shape are output by two output parameters. The input parameters in Procedure 4 include the output parameters in Procedure 3.
Further, the number of output parameters of the previous-stage common module and the number of input parameters of the next-stage common module do not necessarily match. However, there may be information that is necessarily designated in addition to the processing target, or a part of the output of the previous-stage common module may be an input of the previous-stage common module. In this way, by connecting the input/output parameters of each common module, the feature shapes and the feature amounts are extracted from the three-dimensional model of 3D CAD according to the design requirements, and finally a logic can be created to obtain the verification feature amounts for verifying the design requirements. Further, an example in which the procedure is executed serially is illustrated herein as a simple example, but a procedure for branching or looping may be included.
When the logic setting unit 632 executes Steps S102 and S103, the logic for obtaining the verification feature amount according to the design requirement is defined in the rule file. Therefore, in the subsequent steps, the rule check processing procedure according to the design requirement is set. When the designer clicks the information setting button 205, the violation information setting unit 633 opens violation notification boxes 341 to 342 for setting the violation notification information (S104). A rule file creation screen 201 in this state is illustrated in
When the designer clicks the information setting button 206, the violation information setting unit 633 opens violation determination boxes 351 to 353 for setting the violation determination information (S105). The rule file creation screen 201 in this state is illustrated in
When the input of all information is completed, the designer clicks the rule file creation button 207. With this configuration, the created rule file is stored in the rule file DB 524 (S106). The rule file includes basic information, verification feature amount extraction logic, and violation information. There are the information set in S101 in the flow illustrated in
(2) Design Verification Process
In this embodiment, the design verification process is realized by the design support apparatus 521 executing the design verification program 622.
First, the 3D-CAD data calling unit 641 calls 3D-CAD data (three-dimensional model (shape information)) to be verified from the 3D-CAD DB 502 (S201). At this time, it is desirable to interpret the shape information of 3D CAD and check whether it is established as a three-dimensional model. For example, a three-dimensional model in which surfaces are separated and a gap is formed in the same component is not established as a shape, and there is no meaning in verifying whether the design requirement is satisfied. In this case, the designer is warned of a design error, and the design verification process ends.
For the shape information called in S201, a rule file corresponding to the design requirement to be verified is selected (S202).
The rule file reading unit 642 calls the selected rule file from the rule file DB 524. At this time, the rule file reading unit 642 may be provided with a check function equivalent to the format check unit 634, and a mandatory input item such as non-input error check and a grammatical error check may be performed on the rule file. As described above, since the 3D-CAD data 624 and the rule file 623 to be verified are read into the design support apparatus 521, the design verification is executed according to the procedure defined in the rule file (S203).
The common module calling unit 643 reads the feature shape extraction logic of the rule file 623 and calls a necessary common module (S203a). Since the rule file 623 describes information on the common module used for extracting the feature shape, the common module DB 523 is searched on the basis of the ID or the common module name, and stored as the common module 625.
The common module execution unit 644 reads the feature shape extraction logic of the rule file 623, sets the input/output parameters defined in the rule file 623 in the common module 625, and executes the module (S203b). At the same time, the common module execution unit 644 also checks the certainty of the feature shape extraction logic of the rule file. For example, in the common module 01 (point-to-point distance), it is necessary to define two point shapes as input parameters. Herein, if only one point shape is specified in the rule file, the logic outputs an error as uncertain.
The common module call (S203a) and common module execution (S203b) are repeated for the number of common modules defined in the feature shape extraction logic of the rule file, and the verification feature amount is extracted to determine compliance/violation of design requirements. The design requirement violation determination unit 645 collates the verification feature amount extracted by the feature shape extraction logic and the violation information of the rule file 623, and determines whether there is a design requirement violation (S203c). For example, in a case where the verification feature amount (point-to-point distance) extracted according to the feature shape extraction logic of the rule file 623 is determined to be a violation based on the determination conditions described in the rule file, the corresponding part is extracted as a violation shape.
The violation information display unit 646 displays an alarm for the violation shape extracted by the design requirement violation determination unit 645 (S204).
As mentioned above, this invention has been described according to the embodiments, but this invention is not limited to the content of the description. For example, an example is illustrated in which the design apparatus 501 and the design support apparatus 521 are implemented as separate computers as the design environment, but may be implemented with the same computer. In this case, for example, by making the design verification program a plug-in program of 3D-CAD design software, the designer can easily perform a requirement check for each 3D-CAD design. In addition, the design support program (rule file creation program, design verification program) of this embodiment may be realized on the cloud, and is not limited to the embodiment of the program.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-079931 | Apr 2019 | JP | national |
