WO2015132836A1

WO2015132836A1 - Cad geometry creation assistance device

Info

Publication number: WO2015132836A1
Application number: PCT/JP2014/055208
Authority: WO
Inventors: 東奥野; 昌幸針谷
Original assignee: 株式会社日立製作所
Priority date: 2014-03-03
Filing date: 2014-03-03
Publication date: 2015-09-11

Abstract

In order to register all required design rules in a database and check if design rules are met when a product is designed, so as to prevent design rework and thereby achieve efficient designing, this CAD geometry creation assistance device is characterized by being provided with: a draft design rule extraction unit which extracts a draft design rule from an input design document according to an input design rule template; a draft design rule verification unit which determines whether the extracted draft design rule matches the CAD geometry associated with the design document; a result display unit which presents a user with the determination made by the draft design rule verification unit as to whether the extracted draft design rule matches the CAD geometry; and a design rule registration unit which associates the draft design rule with the CAD geometry and the design document and registers the draft design rule, on the basis of the determination made by the draft design rule verification unit.

Description

CAD shape creation support device

The present invention relates to a CAD shape creation support apparatus that supports creation of a CAD shape that is a product shape created on a computer in computer-aided design (Computer Aided Design; generally referred to as “CAD”).

Conventionally, a 3D CAD model created by a designer is searched for similar shapes from shape data and design rules registered in a database in advance, and the computer automatically determines whether the registered design rules are satisfied. However, there is a device that attempts to prevent omission of design rule check by presenting it to a designer (see, for example, Patent Document 1).

JP 2010-211144 A

In recent years, product design using three-dimensional CAD has become widespread in the manufacturing industry. The three-dimensional CAD is a tool for creating a product shape on a computer, and the shape can be freely defined according to the intention of the designer. Here, when a designer uses a three-dimensional CAD to design a product, there are restrictions that must be observed in shape creation due to manufacturing restrictions, requirements for product strength reliability, and the like. For example, in sheet metal processing, there is a restriction that the distance between holes and the distance between the holes and the edge of the shape must be greater than or equal to a reference value due to restrictions on processing accuracy. Such constraints to be considered are referred to herein as design rules. However, for such design rules, when there are many rules to be checked or when there are many parts to be checked, an inexperienced designer may cause a check omission, resulting in a design rework.

In order to deal with such a problem, in Patent Document 1, a similar shape is searched for and registered from shape data and design rules registered in a database in advance for a three-dimensional CAD model created by a designer. A device is described in which a computer automatically determines whether a design rule is satisfied and presents it to a designer, thereby preventing a design rule check from being omitted.

In the apparatus described in Patent Document 1, it is possible to determine whether or not the created three-dimensional CAD model violates the rules with respect to the design rules registered in advance in the database. However, since there are many design rules to be observed in product design, it takes a lot of trouble to manually register the design rules in the database. In addition, when an inexperienced designer performs the task of registering the design rule in the database, there may be a case where the registration itself is omitted or the design rule cannot be correctly registered.

The present invention has been made in view of the above-mentioned problems. Design rules are registered in a database without omission, and checking whether the design rules are satisfied at the time of product design prevents rework of design work. An object of the present invention is to provide an apparatus for performing an efficient design.

In order to solve the above problems, the CAD shape creation support apparatus of the present invention has the following configuration, for example. The present invention includes a plurality of means for solving the above-described problems, and an example thereof is as follows.

That is, the CAD shape creation support apparatus of the present invention relates to a design rule draft extraction unit that extracts a design rule draft from an input design document and a design rule template, and the extracted design rule draft is associated with the design document. A design rule proposal verification unit that determines whether or not it conforms to the CAD shape, a result display unit that presents a result of suitability determined by the design rule plan verification unit to the user, and a determination result of the design rule plan verification unit And a design rule registration unit for registering a design rule proposal in association with the CAD shape and the design document.

According to the present invention, even an inexperienced designer can register design rules in a database in a short time without omission, thereby preventing rework of design work and improving design work efficiency. can do.

It is a figure which shows an example of the system configuration | structure which concerns on one Embodiment of this invention. It is a figure which shows an example of the design document database and CAD model database which concern on one Embodiment of this invention. It is a figure which shows an example of the design rule template which concerns on one Embodiment of this invention. It is a figure which shows an example of the processing flow of design rule proposal extraction which concerns on one Embodiment of this invention. It is a figure which shows an example of the design rule proposal extraction which concerns on one Embodiment of this invention. It is a figure which shows an example of the processing flow of the design rule proposal verification which concerns on one Embodiment of this invention. It is a figure which shows an example of the design rule proposal verification which concerns on one Embodiment of this invention. It is a figure which shows an example of the verification result display screen which concerns on one Embodiment of this invention. It is a figure which shows an example of the design rule edit screen which concerns on one Embodiment of this invention. It is a figure which shows an example of the processing flow of the design rule check which concerns on one Embodiment of this invention. It is a figure which shows an example of the data input screen which concerns on one Embodiment of this invention. It is a figure which shows an example of the design rule check which concerns on one Embodiment of this invention. It is a figure which shows an example of the warning display screen which concerns on one Embodiment of this invention.

The CAD shape creation support apparatus of the present invention, when creating a CAD shape, checks whether the CAD shape conforms to a rule determined in design by a computer, thereby supporting the creation of a CAD shape. This is a support device, and in particular, a CAD shape creation support device provided with means for creating a design rule to be used at the time of the check. More specifically, the CAD shape creation support apparatus of the present invention includes a design rule draft extraction unit that extracts a design rule draft from an input design document and a design rule template, and the extracted design rule draft is the design document. A design rule proposal verification unit that determines whether or not the CAD shape associated with the design rule is matched; a result display unit that presents a result of suitability determined by the design rule proposal verification unit to the user; and the design rule proposal verification unit And a design rule registration unit for registering a design rule proposal in association with the CAD shape and the design document based on the determination result.

According to this configuration, means for creating a design rule that is not used in the conventional CAD shape creation support device and is used at the time of rule check (when the computer checks whether the CAD shape matches a rule determined by design). It becomes possible to register the design rule in the database while suppressing leakage in a short time.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings as an example.

In this embodiment, a CAD model creation support apparatus that registers a design rule draft extracted from a design document in a database and determines whether a CAD model to be designed satisfies a registered design rule at the time of product design. An example will be described.

FIG. 1 shows an example of a system configuration diagram of this embodiment. In the system configuration diagram of this embodiment, when a design rule is created, an input / output device 101 including a keyboard, a mouse, a display, etc. for inputting data and displaying it on a screen, and a design document describing the design rule are input. A design document input unit 103, a design document database 102 capable of registering the input design document, a design rule template input unit 105 for inputting a design rule template in which a design rule template is recorded, and an input design rule A design rule template database 104 capable of registering templates, a design rule plan extraction unit 107 that extracts a design rule plan 106 from an input design document according to the design rule template, and a CAD model input unit 109 that inputs a CAD model shape CAD data that can register CAD models A database 108, a design rule proposal verification unit 110 that verifies whether the design rule proposal 106 matches the input CAD model, a result display unit 111 that displays a verification result, and a design rule that matches the CAD model as a result of the verification. The design rule registration unit 113 registers a plan in the design rule database 112. In addition, at the time of new or customized design, an input / output device 114 including a keyboard, a mouse, a display, etc. for inputting data and displaying it on a screen, a CAD model input unit 116 for inputting a CAD model 115 to be designed, and a design A design rule input unit 117 for inputting the rule database 112, a similar shape search unit 118 for searching for a shape similar to the CAD model from the input design rules, and a design rule registered for the similar shape are input. The design rule check unit 119 that determines whether or not the CAD model 115 is satisfied, and the warning display unit 120 that displays a warning to the apparatus user when the design rule is not satisfied. Here, among the design rules verified by the design rule draft verification unit 110, a design rule plan that matches the CAD model is registered in the design rule database 112 by the design rule registration unit 113. The device user may be provided with means for determining whether or not the design rule proposal displayed on the screen is appropriate, and only the design rule proposal selected by the device user may be registered in the design rule database 112. At this time, the apparatus user may be provided with a means for changing the design rule proposal extracted from the design document. In this section, we explain how to register design rules extracted from design documents in the design rule database and use the design rule database when designing a new or customized design so that the computer can check whether the CAD model to be designed satisfies the rules. However, the apparatus user may check the extracted design rule and manually check the CAD model to be designed.

Explain the procedure for extracting design rule proposals from design documents to create design rules.

First, the relationship between the design document database and the CAD model database will be described with reference to FIG. The CAD model database 201 stores three-dimensional CAD data of products that have been designed in the past. The design document database 202 stores reference information when these CAD models are created and stores the created design documents. Has been. The design document is a document in which rules of attributes such as shapes and materials to be protected in product design are described, and includes, for example, a design standard document, a design specification, an analysis report, a past defect report document, and the like. The CAD model and the design document are associated with each other as shown in FIG. 2. For example, in the example of FIG. 2, CAD_A01 is associated with design document_c01 and design document_c02, and CAD_A02 is associated with design document_d02. This association may be realized by preparing a file that describes the storage location of the design document associated with each CAD model data, or the design document associated with the same storage location as the CAD data on the computer is stored. It may be realized.

Figure 3 shows an example of a design rule template. For example, a rule number 301, a rule name 302, a target shape 303, and a design rule template 304 are registered in the design rule template. As an example, no. According to the rule for the boss fillet size of 1, the target shape is the boss root fillet, and the registered design rule template is such that the diameter r0 of the boss root fillet is larger than r0_min and smaller than r0_max. Here, design rule templates are registered, so specific values are not registered in r0_min and r0_max, but a rule that r0 is between a certain value and a certain value is registered. .

Figure 4 shows an example of the processing flow for extracting design rule proposals. In the design rule extraction process flow, first, a morpheme / part-of-speech analysis process 401 is performed on a design document that is a design rule extraction target. Morphological analysis is a process of dividing a Japanese sentence into meaningful words, and part-of-speech analysis is a process of specifying the part of speech of the divided words. Next, a restriction condition extraction process 402 is performed from the word group divided by the morpheme / part of speech analysis. The restriction condition is a condition that a certain dimension value should satisfy. For example, “more than,” “less than,” “less than,” “greater than,” “greater than” immediately after a number or unit, such as “0.5 mm or more”. ”,“ Less than ”morpheme, and“> ”,“ <”,“> = ”,“ <= ”,“ = ”,“ ˜ ”, etc. is there. For a sentence including such words and symbols, the shape and parameters of the target and its limiting conditions are extracted. Next, a determination process 403 is performed to determine whether the extracted restriction condition matches the rule registered in the design rule template. If the extracted restriction condition matches, an output process 404 of the design rule draft 405 is performed. In this case, the design rule proposal is the one that conforms to the design rule template, but when a rule that does not conform to the design rule template is extracted, the device user adds the rule to the design rule template, Means adopted as a design rule draft may be provided.

Figure 5 shows an example of design rule proposal extraction. When the subject sentence 501 “The diameter of the fillet at the base of the boss must be between 0.5 mm and 1.0 mm” is analyzed, it is divided into words as in 502 and the part of speech is determined. The Next, when limiting conditions are extracted, the target shape, parameters, and limiting conditions are extracted as in 503. Further, in the conformity determination with the design rule template, conformity with the example of the design rule template in FIG. 3 is determined, and it conforms to the rule of No. 1 boss fillet size_001. , R0_max can be determined to be 0.5 mm and 1.0 mm, respectively.

Next, the procedure for design rule verification will be described.

Fig. 6 shows an example of the processing flow for design rule proposal verification. Here, whether or not the design rule proposal extracted from the design document is correct is verified using the CAD model data to be designed. First, CAD model data is input in a data input process 601. As shown in FIG. 2, the CAD model data input here is CAD model data associated with the design document from which the design rule proposal is extracted. The input CAD model data is one or a plurality of CAD model data. is there. Next, in the shape parameter extraction processing 602, the shape parameter targeted by the design rule proposal extracted from the design document is extracted from the input CAD model data. For example, for the design rule draft 504 extracted in FIG. 5, the target shape is a fillet at the root of the boss as shown in 503, and the parameter is the diameter of the fillet. The extraction method of the shape parameter differs depending on the parameter to be extracted. Taking the above fillet diameter as an example, the surface connecting the boss and the bottom surface is assumed to be a fillet. If the surface is a cylindrical surface, its radius and truss In the case of a surface, a small radius is calculated as the fillet diameter. Further, in the design rule draft verification process 603, it is verified whether the extracted shape parameter satisfies the design rule draft. For example, if the shape parameter r0 is 0.7 mm and the design rule draft is 0.5 mm <r0 <1.0 mm, it is acceptable, and if r0 is 1.2 mm and the same design rule draft is not suitable. For example, design information of a plurality of parts is included in one sentence, and the correspondence between the part and the numerical value is determined by the morpheme / part-of-speech analysis processing unit 401 or the restriction condition extraction processing unit 402 in FIG. The case where it was not able to extract normally is considered. In the present invention, when the design rule proposal is extracted from the design document in this way, even if the design rule proposal cannot be extracted normally, the design rule proposal is verified by the CAD model, so that an inappropriate design rule is mistakenly stored in the design rule database. You can avoid registering. In addition, the shape parameter verified here may be one or plural depending on the number of target shapes included in the CAD model. When there are a plurality of shape parameters, if any one of the shape parameters does not match the design rule proposal, it is determined that the design rule proposal is inappropriate. The verified result is presented to the apparatus user in the result display unit 111.

Figure 7 shows an example of design rule proposal verification. The CAD model associated with the design document from which the design rule proposal 701 is extracted includes the shape 702. A fillet 704 is attached to the root of the boss 703 in the shape 702, and the shape parameter r 0 is calculated as 0.7 mm from the small radius of the truss surface, and the verification result is appropriate as in 705.

Figure 8 shows an example of the verification result display screen. On the verification result screen, a rule name 801, a design document name 802 from which a rule is extracted, a target shape 803, a design rule 804, a CAD model name 805 to be verified, and a suitability result 806 are displayed. When a registration button 807 is pressed here, the displayed rule is registered in the design rule database 112. When the edit button 808 is pressed, a screen for editing the design rule parameters is opened, and the apparatus user can change the parameter values. An end button 809 ends this screen. An example of the parameter editing screen is shown in FIG. On the parameter editing screen, the parameter name 901 and the value 902 of the design rule to be edited are displayed, and the device user can edit the value. The edited value is registered when the user selects the registration button 903, and the input value is reflected on the verification result display screen of FIG. In addition, the end button 904 ends this screen. Although an example of one design rule proposal is displayed in FIG. 8, when a plurality of design rule proposals are extracted from the design document, verification results of the plurality of design rule proposals are displayed on the verification result display screen. In this case, an edit button and a registration button are prepared for each design rule proposal, and the design rule proposal selected by the apparatus user is registered in the design rule database.

When registration is executed on the verification result display screen, the design rule is registered in the design rule database 112. The format of the design rule database is the same as that of the design rule template of FIG. 3, for example, and an actual numerical value is substituted for the parameter name location of the design rule template 304. Further, the design rule database may store the CAD model data of the target shape as basic shape data for each design rule. When basic shape data is included in the design rule database, when performing a design rule check during new or customized design, a shape that is similar to the basic shape is searched by searching for a shape that is similar to the basic shape. However, the design rule check can be applied.

Next, the procedure for checking whether the CAD model to be designed satisfies the design rules registered in the design rule database at the time of new or customized design will be described.

Figure 10 shows an example of the design rule check process flow. First, in a data input process 1001, a design target CAD model 1002 and a design rule database 1003 are input. Next, in the similar shape search processing 1004, it is searched from the design target CAD model 1002 whether a shape similar to the basic shape registered in the design rule database 1003 is included. The similar shape search method focuses on, for example, the connection relationship between the shape surfaces and the type of the surface, and makes a shape that has the same shape a similar shape, or divides the shape surface into meshes of surface triangles and includes the surfaces included in the shape. There is a method of obtaining from a distribution (histogram) of triangular normal vectors. With respect to the similar design target CAD model searched here, the shape parameter extraction processing 1005 extracts the shape parameters targeted by the design rule. The method here is the same as the shape parameter extraction processing 602 for verifying the design rule proposal extracted from the design document. Next, it is determined whether the parameter extracted in 1006 satisfies the target design rule. This method is also the same as the design rule proposal verification processing 603 for verifying the design rule proposal. If the shape parameter does not satisfy the target design rule, a warning display process 1007 is performed for the apparatus user. Here, the procedure for performing the design rule check when the device user designates the design target CAD model and the design rule database has been described. However, the device user designates the CAD model data in advance by designating the design rule database. There may be provided means for operating the CAD software to sequentially check the design rules when the shape is added or changed, and to display a warning when a design rule violation occurs.

FIG. 11 shows an example of a screen in the data input process 1001. On the data input screen, the apparatus user selects the file name of the CAD model to be checked in the input box 1101 from the input or reference button 1102 and similarly selects the design rule database name in the input box 1103 from the input or reference button 1104. Next, the file selected by the execution button 1105 is read into the computer. In addition, the data input screen is ended by an end button 1106.

Figure 12 shows an example of design rule check. The design target shape 1203 is searched as a similar shape with respect to the design rule 1201 and its basic shape 1202, and the extracted shape parameter r0 does not satisfy the design rule, so that it is determined as non-conforming as in 1204.

Fig. 13 shows an example of the warning display screen. The nonconforming part 1301 of the design rule is highlighted, and the warning display unit 1302 displays the number of the violated design rule, the content of the design rule, and the value of the violated parameter. The device user can modify the shape parameter value in accordance with this warning to correct the shape to conform to the design rule.

As described above, according to the first embodiment of the present invention, the design rule is extracted from the design document and the suitability is determined from the CAD model data. Design rules can be registered in the database. Further, by performing a rule check using a design rule registered in the design rule database at the time of new or customized design, rework of the design work can be prevented and the design work can be made highly efficient.

DESCRIPTION OF SYMBOLS 101 Input / output device 102 Design document database 103 Design document input part 104 Design rule template database 105 Design rule template input part 106 Design rule plan 107 Design rule plan extraction part 108 CAD model database 109 CAD model input part 110 Design rule plan verification part 111 Result display unit 112 Design rule database 113 Design rule registration unit 114 Input / output device 115 Design target CAD model 116 CAD model input unit 117 Design rule input unit 118 Similar shape search unit 119 Design rule check unit 120 Warning display unit 201 CAD model database 202 Design document database 301 Rule number 302 Rule name 303 Target shape 304 Design rule template 401 Morphological / part of speech analysis processing unit 02 Restriction condition extraction processing unit 403 Conformity determination unit with design rule template 404 Design rule proposal output processing unit 405 Design rule plan 501 Text including design rule 502 Morphological / part of speech analysis result 503 Restriction condition extraction result 504 With design rule template Conformance judgment result 601 Data input processing unit 602 Shape parameter extraction processing unit 603 Design rule draft verification processing unit 701 Design rule draft to be verified 702 Rule target shape 703 Boss shape 704 Fillet shape 705 Verification result 801 Rule name 802 Design document name 803 Target Shape 804 Design rule 805 CAD model name 806 Appropriate result 807 Registration button 808 Edit button 809 End button 901 Parameter name 902 Value 903 Registration button 904 End button 1001 Data Data input processing unit 1002 Design target CAD model 1003 Design rule database 1004 Similar shape search processing unit 1005 Shape parameter extraction processing unit 1006 Design rule check processing unit 1007 Warning display unit 1101 Input CAD model data specifying unit 1102 Reference button 1103 Input design rule data Designation part 1104 Reference button 1105 Execution button 1106 End button 1201 Design rule 1202 Basic shape 1203 Similar shape searched design target shape 1204 Rule check result 1301 Shape in violation of rule 1302 Warning display

Claims

A design rule draft extraction unit that extracts a design rule draft from the input design document and the design rule template;
A design rule proposal verification unit that determines whether or not the extracted design rule proposal conforms to the CAD shape associated with the design document;
A result display unit that presents to the user the result of suitability determined by the design rule draft verification unit;
A CAD shape creation support apparatus comprising: a design rule registration unit that registers a design rule plan in association with the CAD shape and the design document based on a determination result of the design rule plan verification unit.
The CAD shape creation support apparatus according to claim 1,
A similar shape search unit for searching for a similar shape between the input CAD data and the basic shape registered in the design rule database at the time of new or customized design;
A design rule check unit that checks the design rule against the CAD shape based on the design rule registered in the searched similar shape;
A CAD shape creation support apparatus, further comprising a warning display unit that presents a warning to the apparatus user when the design rule is violated.
The CAD shape creation support apparatus according to claim 1,
A CAD shape creation support apparatus, further comprising means for an apparatus user to edit a design rule proposal extracted from a design document and a design rule template and register the draft in a design rule database.