Automobile injection molding product modeling method and system based on CATIA software

Abstract

The invention relates to the technical field of automobile injection molding products, in particular to an automobile injection molding product modeling method and system based on CATIA software, which can adapt to automobile injection molding product modeling, improve the digital-analog modification efficiency and improve the product design efficiency. In order to avoid the problems existing in CATIA software part entity modeling, detailed operation of entity modeling is subdivided into independent entities to avoid the situation of surface command loss caused by profile change, and countermeasures and optimization suggestions are given for the error reporting problem in data updating so as to achieve modeling parameterization and improve the efficiency of digital-analog change. According to the modeling method, curved surface modeling and solid modeling need to be combined, a part with parameters is put into curved surface modeling, and it is guaranteed that solid digital-analog updating is convenient. For the common error reporting problem in data updating, an avoiding strategy and an optimization scheme are provided through modeling. The technical problems that an existing automobile injection molding product modeling method is poor in modification convenience and low in efficiency can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile injection molding products, and in particular to a modeling method and system for automobile injection molding products based on CATIA software. Background Art

[0002] When designing automotive injection molding products, it is usually necessary to add reinforcing ribs to the back of the injection molding product, adjust the draft angle, add mounting card points and other structures.

[0003] At present, there is no dedicated modeling method for designing automotive injection molding products. In the existing technology, the material thickness of the A surface of the part is offset first to generate a closed entity, and then the entity is edited to add mounting structures, open holes, etc. Since the design of injection molding products changes frequently during the process, this modeling method is prone to update errors when data is changed, and many related steps need to be adjusted to achieve the update, resulting in poor modification convenience and low efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for modeling automobile injection molding products based on CATIA software, which can solve the technical problems of poor modification convenience and low efficiency of the existing method for modeling automobile injection molding products.

[0005] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0006] The present invention designs a modeling method for automobile injection molding products based on CATIA software, comprising the following steps:

[0007] Create a closed solid based on the input A surface, and assemble this closed solid into the main part as the body;

[0008] Create closed solid center points and import standard mounting structures;

[0009] Make parametric modifications to the standard installation structure under the installation structure entity;

[0010] Add the installation structure entity to the main part and perform joint trimming;

[0011] Create separate solid structures and make part reinforcement ribs;

[0012] After parametric trimming using the Joint Trim command, add the ribs of the stiffener to the main part;

[0013] Post-processing of main parts;

[0014] Complete the solid modeling of automotive injection molding products.

[0015] As a preferred solution, use the A surface for offset to make a DOGHOUSE thinning structure and a slider structure to thin the bottom of the part and achieve parameterization. Use the trim command to combine the offset A surface and the inner surface of the DOGHOUSE structure.

[0016] As a preferred solution, the standard mounting structure is parametrically modified under the mounting structure entity, specifically including: using the trim command under the DOGHOUSE structure to split the thinning structure, and performing draft chamfering on the DOGHOUSE structure in the direction of the slider to complete the entity editing work, and then adding the DOGHOUSE structure to the standard mounting structure to realize the parametric modification of the standard mounting structure itself.

[0017] Furthermore, after the standard mounting structure is parametrically modified, it is determined whether the modified mounting structure entity is sufficient; if so, proceed to the next step; if not, return to the first step, create a closed entity based on the input A surface, and then assemble this closed entity into the main part as the body.

[0018] As a preferred solution, the installation structure entity is added to the main part and joint trimming is performed, specifically including: selecting the faces of the standard installation structure that do not intersect with the main body, using the joint trimming command to remove unnecessary faces in the standard installation structure, and adding the standard installation structure to the main part structure.

[0019] As a preferred solution, according to the part structure requirements, repeat the following steps: parametrically modify the standard installation structure, add the installation structure entity to the main part, and perform joint trimming; complete the data structure refinement.

[0020] As a preferred solution, after parametric trimming using the joint trim command, the rib position of the reinforcement is added to the main part, specifically including: using the sketch command to make the part reinforcement, and editing the reinforcement shape as required. The height of this reinforcement is flush with the A surface and there is an association. A separate cutting surface is created to trim the reinforcement, and the reinforcement is added to the main part.

[0021] The present invention also designs a car injection molding product modeling system based on CATIA software, including the following modules:

[0022] The module of creating closed solid is used to create a closed solid according to the input A surface, and assemble this closed solid into the main part as the body;

[0023] Import standard installation structure module, used to create closed entity center points and import standard installation structures;

[0024] A parametric modification module is used to perform parametric modification on the standard installation structure under the installation structure entity;

[0025] Trimming mounting structure module, used to add mounting structure entity to main part and perform joint trimming;

[0026] The rib making module is used to create a separate solid structure and make part ribs;

[0027] Add rib module, which is used to add the rib position of the rib to the main part after parametric trimming using the joint trim command;

[0028] Post-processing module, used for post-processing the main parts;

[0029] The solid modeling module is used to complete the solid modeling of automotive injection molding products.

[0030] Beneficial effects of the present invention:

[0031] The present invention provides a modeling method and system for automobile injection molding products based on CATIA software, which can be adapted to the modeling of automobile injection molding products, improve the efficiency of digital model modification, and enhance the efficiency of product design. In order to avoid the problems existing in the solid modeling of parts in CATIA software, the present invention provides a reasonable modeling step, subdividing the detailed operations of solid modeling into independent entities to avoid the loss of surface commands caused by surface changes, and providing countermeasures and optimization suggestions for error reporting problems in data updating, so as to realize modeling parameterization and enhance the efficiency of digital model changes.

[0032] The modeling method of the present invention requires the combination of surface modeling and entity modeling, and the parameterized part is placed in the surface modeling to ensure the convenience of updating the entity digital model. The present invention proposes an avoidance strategy and an optimization scheme through modeling for the common error reporting problem in data updating. The present invention can solve the technical problems of poor modification convenience and low efficiency of the existing modeling method for automobile injection molding products. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of the present invention.

[0034] Figure 2 It is a schematic diagram of creating a plastic part body and a structure tree in the present invention.

[0035] Figure 3 This is a schematic diagram of importing standard structure data and modifying the structure tree in the present invention.

[0036] Figure 4 It is a structural schematic diagram of the parametric cutting process using the DOGHOUSE structure in the present invention.

[0037] Figure 5 It is a structural schematic diagram of the joint pruning of the DOGHOUSE structure and the parameterized structure of the present invention.

[0038] Figure 6It is a schematic diagram of the use of joint pruning in the present invention.

[0039] Figure 7 It is a schematic diagram of the entity after joint pruning in the present invention.

[0040] Figure 8 This is a schematic diagram of the main part structure after adding an entity under the main part in the present invention.

[0041] Fig. 9 This is a schematic diagram of the main part after reinforcing ribs are added under the main part in the present invention.

[0042] Fig.10 It is a schematic diagram of the structure obtained by processing the reinforcing ribs according to the requirements in the present invention.

[0043] Fig.11 It is a partial schematic diagram of adding reinforcing ribs to a solid body in the present invention.

[0044] Description of reference numerals:

[0045] Main body S1, standard mounting structure S2, removed surface C1, reinforcing rib S16. DETAILED DESCRIPTION

[0046] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The present invention relates to a modeling method and system for automobile injection molding products based on CATIA software, which can be adapted to the modeling of automobile injection molding products, improve the efficiency of digital model modification, and enhance the efficiency of product design. The modeling method of the present invention requires the combination of surface modeling and solid modeling, and puts the parameterized part into the surface modeling to ensure the convenience of updating the solid digital model. The present invention proposes avoidance strategies and optimization solutions through modeling for common error reporting problems in data updating.

[0049] Due to the following problems in the solid modeling of CATIA software parts, the solid planes of CATIA software parts all have separate and unique numbers, and it is difficult to avoid the selection of solid faces in single entity operations. During data production, multiple versions of data will be updated according to the surface input, and the selected surface number will be lost and the data cannot be refreshed. In order to avoid the problems existing in the solid modeling of CATIA software parts, the present invention provides a reasonable modeling step, which subdivides the detailed operations of solid modeling into independent entities to avoid the loss of surface commands caused by surface changes, and provides countermeasures and optimization suggestions for error reporting problems in data updates, so as to realize parameterized modeling and improve the efficiency of digital model changes.

[0050] In view of this, the present invention provides a method for modeling automobile injection molding products based on CATIA software, and the steps are as follows:

[0051] Step 1: According to the input A surface and engineering requirements, use the closed surface command to close the entity to create an independent solid structure, and then assemble this solid structure into the main part as a body.

[0052] Step 2: Use the Point command to create a solid center point based on the coordinates and import the standard installation structure.

[0053] Step 3: Modify the standard installation structure parametrically under the installation structure entity according to the part requirements;

[0054] The mating part with the main body needs to be thinned. Use the A-surface offset and the inner surface offset of the DOGHOUSE structure to thin the bottom of the part. Use the trim command to combine the offset A-surface and the inner surface of the DOGHOUSE.

[0055] Use the trim command under the DOGHOUSE structure to split the thinning structure, and perform draft chamfering on the DOGHOUSE structure in the direction of the slider to complete the entity editing work. Then add the DOGHOUSE structure to the standard installation structure to realize the parametric modification of the standard installation structure itself.

[0056] Determine whether the modified installation structure entity is sufficient; if yes, proceed to the next step; if not, return to the first step, create a closed entity based on the input A surface, and then assemble this closed entity into the main part as the body.

[0057] Step 4: Use the Union Trim command to add the solid structure entities to the main part entity.

[0058] Select the faces of the standard mounting structure that do not intersect the main body, use the Joint Trim command to remove unnecessary faces in the standard mounting structure, and add the standard mounting structure to the main part structure.

[0059] Step 5: Repeat steps 2-4 according to the part structure requirements to complete the data structure refinement.

[0060] Step: 6: Create a separate solid structure and make part reinforcement ribs.

[0061] Step 7: After parametric trimming using the Joint Trim command, add the ribs of the stiffener to the main part.

[0062] Use the sketch command to create part reinforcement ribs and edit the shape of the reinforcement ribs as needed. The height of this reinforcement rib is flush with the A surface and there is an association. Create a separate cutting surface to trim the reinforcement ribs and complete the addition of the reinforcement ribs to the main part.

[0063] Step 8: Post-process the main part (chamfering, etc.).

[0064] Step 9: Complete the solid modeling of the automobile injection molding product.

[0065] It should be understood that the specific order or hierarchy of steps in the process disclosed by the present invention is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims provide the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0066] The following is an explanation based on an example of the implementation of the present invention.

[0067] like Figure 2 The figure shows the schematic diagram of creating the plastic body and structure tree in step 1 of the present invention. The material thickness offset, boundary trimming and closed entity are performed on the main part according to the A surface, and the entity is named "body S1". If other entity operations are required, they need to be performed under the body structure tree. Use the "Body" command to create a geometric body and name it "main part", and assemble the body S1 to the main part structure tree through "Assemble".

[0068] like Figure 3 As shown, a schematic diagram of importing standard structure data and a schematic diagram of a structure tree for modifying data in the standard structure entity are shown, the "Point" command is used to create an installation center, and then the standard installation structure S2 is imported. The import of the standard installation structure can refer to "A Screw Column Structure Optimization Design Method Based on CATIA Software".

[0069] Conventional standard installation structures do not include root thinning, DOGHOUSE and other structures. The size of the standard installation structure S2 itself also needs to be adjusted to intersect with the main body S1, so it needs to be modified according to the actual situation of the part. The DOGHOUSE structure is a common structural form in automotive interior and exterior plastic parts, and is mainly used to solve some specific design problems. Its name comes from its shape similar to a doghouse, so it is called a DOGHOUSE structure. In automotive interior and exterior plastic parts, common forms of DOGHOUSE structures include snap-on seats, snap-on structure bases, support structure bases and BOSS column bases. Taking the more complex snap-on structure of this product as an example, a DOGHOUSE structure is made to create an independent entity. The relevant parameters of the DOGHOUSE structure are performed under the DOGHOUSE structure entity. The joint with the main body S1 needs to be thinned. Here, the A surface is used, offset by 5mm, and the bottom thinning of the inner surface of the DOGHOUSE is offset by 1.5mm. The two surfaces are combined using the trim command to obtain Figure 4 Surface.

[0070] Figure 4 In order to use the structural schematic diagram of the parametric cutting process of the DOGHOUSE structure, the Trim command is used under the DOGHOUSE structure to split the thinning structure, and the draft chamfer of the DOGHOUSE structure is performed in the direction of the slider to complete the entity editing work. The DOGHOUSE structure is then added to the standard installation structure S2 to complete all parametric modifications of the standard installation structure S2.

[0071] Figure 5 This is a structural diagram of the joint trimming of the DOGHOUSE structure and the parametric structure. Here, all the parameters related to the A surface and the DOGHOUSE related parameters are placed in the surface operation. The editing of the surface is not reflected in the solid structure. This method reduces the risk of errors in data production.

[0072] like Figure 6 As shown in the figure, it is a schematic diagram of the use of union trimming; use the "Union Trim" command to remove the unnecessary faces of the standard installation structure S2, remove face C1, and add the standard installation structure S2 to the main part structure. Figure 7 The structure tree and data shown are the schematic diagram of the entity after joint pruning. Note that when using this command, you need to select the non-intersecting faces of the standard installation structure S2 and the body S1 to avoid affecting the face parameters of the face related to the main part during the update to reduce the risk of error reporting.

[0073] Repeat steps 2-4 to create S3-S15 structural part data according to specific data requirements, use the "Union Trim" command to add the parts to the main part, and obtain Figure 8The data of the parts and structure tree shown is the schematic diagram of the main part structure after adding entities S1-S15 under the main part.

[0074] Create solid reinforcement rib S16, use the "Sketch" command to make part reinforcement ribs and edit the reinforcement rib shape as required to obtain the following Fig. 9 The effect shown is the schematic diagram of the main part after adding reinforcement ribs under the main part.

[0075] The height of this rib is flush with the A surface, and there is an association. Create a separate cutting surface to trim the rib, and then repeat steps 5-7 to complete the addition of the rib. The entity is obtained Fig.10 The effect shown is a schematic diagram of the structure obtained by processing the reinforcement ribs according to the requirements.

[0076] like Fig.11 The figure shows a partial schematic diagram of adding reinforcement ribs to the entity. After completing the post-processing of the parts, small structural optimization steps such as fillets and C angles are added to the spliced ​​entities S1-S16 according to data requirements. The entity modeling of the automotive injection molding product is completed.

[0077] The present invention also provides a CATIA software-based automobile injection molding product modeling system, comprising the following modules:

[0078] The module of creating closed solid is used to create a closed solid according to the input A surface, and assemble this closed solid into the main part as the body;

[0079] Import standard installation structure module, used to create closed entity center points and import standard installation structures;

[0080] A parametric modification module is used to perform parametric modification on the standard installation structure under the installation structure entity;

[0081] Trimming mounting structure module, used to add mounting structure entity to main part and perform joint trimming;

[0082] The rib making module is used to create a separate solid structure and make part ribs;

[0083] Add rib module, which is used to add the rib position of the rib to the main part after parametric trimming using the joint trim command;

[0084] Post-processing module, used for post-processing the main parts;

[0085] The solid modeling module is used to complete the solid modeling of automotive injection molding products.

[0086] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for modeling automobile injection molding products based on CATIA software, characterized in that: The following steps are included: Create a closed solid based on the input A surface, and assemble this closed solid into the main part as the body; Create closed solid center points and import standard mounting structures; Make parametric modifications to the standard installation structure under the installation structure entity; Add the installation structure entity to the main part and perform joint trimming; Create separate solid structures and make part reinforcement ribs; After parametric trimming using the Joint Trim command, add the ribs of the stiffener to the main part; Post-processing of main parts; Complete the solid modeling of automotive injection molding products.

2. The method for modeling automobile injection molding products based on CATIA software according to claim 1, characterized in that: Use the A surface for offset to make the DOGHOUSE thinning structure and the slider structure, thin the bottom of the part and realize parameterization. Use the trim command to combine the offset A surface and the inner surface of the DOGHOUSE structure.

3. The method for modeling automobile injection molding products based on CATIA software according to claim 2, characterized in that: The standard mounting structure is parametrically modified under the mounting structure entity, specifically including: using the trim command under the DOGHOUSE structure to split the thinning structure, and performing draft chamfering on the DOGHOUSE structure in the direction of the slider to complete the entity editing work, and then adding the DOGHOUSE structure to the standard mounting structure to realize the parametric modification of the standard mounting structure itself.

4. The method for modeling automobile injection molding products based on CATIA software according to claim 3, characterized in that: After parametrically modifying the standard mounting structure, determine whether the modified mounting structure entity is sufficient; if so, proceed to the next step; if not, return to the first step, create a closed entity based on the input A surface, and then assemble this closed entity into the main part as the body.

5. The method for modeling automobile injection molding products based on CATIA software according to claim 4, characterized in that: Add the mounting structure entity to the main part and perform joint trimming, including: select the faces that do not intersect the standard mounting structure and the body, use the joint trim command to remove unnecessary faces in the standard mounting structure, and add the standard mounting structure to the main part structure.

6. The method for modeling automobile injection molding products based on CATIA software according to claim 5, characterized in that: According to the part structure requirements, repeat the following steps: parametrically modify the standard installation structure under the installation structure entity, add the installation structure entity to the main part, and perform joint trimming; complete the data structure refinement.

7. The method for modeling automobile injection molding products based on CATIA software according to claim 5, characterized in that: After parametric trimming using the joint trim command, the rib position of the rib is added to the main part, including: using the sketch command to make the part rib, and editing the rib shape as needed. The height of this rib is flush with the A surface and there is an association. A separate cutting surface is created to trim the rib, and the rib is added to the main part.

8. An automotive injection molding product modeling system based on CATIA software, characterized by: Includes the following modules, The module of creating closed solid is used to create a closed solid according to the input A surface, and assemble this closed solid into the main part as the body; Import standard installation structure module, used to create closed entity center points and import standard installation structures; A parametric modification module is used to perform parametric modification on the standard installation structure under the installation structure entity; Trimming mounting structure module, used to add mounting structure entity to main part and perform joint trimming; The rib making module is used to create a separate solid structure and make part ribs; Add rib module, which is used to add the rib position of the rib to the main part after parametric trimming using the joint trim command; Post-processing module, used for post-processing the main parts; The solid modeling module is used to complete the solid modeling of automotive injection molding products.

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