A U-shaped groove inner rib plate modeling method, recording medium and system

Abstract

The present invention belongs to the technical field of stamping die design, and particularly relates to a method for modeling a rib plate in a U-shaped groove, comprising the following steps: selecting a point PT1 at a position where a rib plate needs to be added; finding a point PT2 on the boundary line closest to point PT1, making a reference plane D1 through the point with the tangent of the boundary line as the normal, and making a reference plane D2 perpendicular to the inner surface of the U-shaped groove and the reference plane D1; intersecting the reference plane D1 with the U-shaped groove entity to generate multiple intersecting curves, and stitching the intersecting curves whose midpoints are not at zero distance from the reference plane D2 into multiple stitching curves; selecting a stitching curve passing through the point PT1, offsetting it in the direction of the U-shaped groove entity, generating an offset curve, closing the offset curve and stretching it into a rib plate along the tangent of E1. The standardized design scheme of the present invention reduces the workload of rib design and can greatly shorten the design cycle. The present invention also provides a non-transient readable recording medium storing a program for the method for modeling a rib plate in a U-shaped groove and a device containing the medium, and the program can be called by a processing circuit to execute the above method.

Description

Technical Field

[0001] The invention belongs to the technical field of stamping die design, and discloses a U-shaped groove inner rib plate modeling method, a recording medium and a system storing a program capable of executing the method. Background Art

[0002] The stamping of automobile cover parts is inseparable from the mold, which is an essential tooling for stamping parts; the most used parts in the mold are castings, including upper and lower base plates, pressure rings, ejectors and other large castings, which account for more than 60% of the entire mold design workload. In order to reduce the weight of castings, rib design is an indispensable and important link. It can be said that the design of various ribs is the most labor-intensive part of casting design, and the quality of rib design directly affects the quality of the entire mold casting and the design cycle.

[0003] The traditional rib design method is to use the basic functions of CAD software to establish the rib center line step by step through general modeling methods such as drawing lines in space, cutting, stretching, cutting and merging, and then generate ribs through the rib center line stretching, and then merge with the casting body. Repeat this operation to complete the design of all ribs of the mold casting; these operations have very low modeling efficiency and a large workload. It is urgent to use the modeling advantages of CAD software to change the traditional design method and create an efficient rib design method. Summary of the invention

[0004] In view of the above problems, the present invention provides a U-shaped groove inner rib plate modeling method, and the specific scheme includes the following steps:

[0005] S1. Select a point PT1 on the surface of the U-shaped groove where a rib plate needs to be added, and find the entity B1 that includes the surface and the boundary line E1 that is closest to the point PT1;

[0006] S2. Determine the point PT2 on the boundary line E1 that is closest to the point PT1, make a reference plane D1 through the point PT2 with the tangent direction of the boundary line E1 as the normal, and make a reference plane D2 through the point PT2 that is perpendicular to the inner surface of the U-shaped groove and the reference plane D1;

[0007] S3. intersecting the reference plane D1 with the entity B1 to generate multiple intersecting curves, filtering out the intersecting curves whose midpoints are at zero distance from the reference plane D2, and stitching the remaining intersecting curves into multiple stitching curves;

[0008] S4. Select the stitching curve passing through the point PT1, offset it toward the direction of the entity B1 to generate an offset curve, close the offset curve and stretch it tangentially along the boundary line E1 to generate a rib plate model.

[0009] This modeling method improves the modeling speed by converting line modeling into surface modeling. It can also be combined with CAD software and edited into macros for users to easily call. At the same time, offset processing is applied to effectively fill the gap between the rib plate and the trough body.

[0010] Preferably, the point PT1 in step S1 is on the boundary of the inner surface of the U-shaped groove.

[0011] In this way, point PT1 coincides with point PT2, and the modeling process is simpler.

[0012] Preferably, the distance offset in the direction of the solid BODY in step S4 can ensure that the offset curve is within the solid BODY during the stretching process.

[0013] This ensures that there is no gap between the stretched rib plate and the bottom of the U-shaped groove, which is beneficial to the subsequent casting process.

[0014] Another solution of the present invention is to provide a non-transitory readable recording medium for storing one or more programs including a plurality of instructions. When the instructions are executed, the processing circuit will execute the above-mentioned method for modeling a rib plate in a U-shaped groove.

[0015] Another embodiment of the present invention is to provide a metal grain boundary modeling system, including a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, wherein the program includes a plurality of instructions, and the processing circuit runs the program to execute the above-mentioned U-groove inner rib modeling method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of point selection in an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of establishing a reference plane in an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of finding intersection with an entity in an embodiment of the present invention;

[0019] Figure 4 Schematic diagram of a stitching curve in an embodiment of the present invention;

[0020] Figure 5 Schematic diagram of a bias curve in an embodiment of the present invention;

[0021] Figure 6 A schematic diagram of a closed curve in an embodiment of the present invention;

[0022] In the figure, PT1 and PT2 are points; D1 and D2 are reference planes; E1 is the boundary line; E2 is the intersection curve; C1 is the stitching curve; C2 is the offset curve; C3 is the closed curve; B1 is a solid; PL1 is the side plane. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making innovative efforts are within the scope of protection of the present invention.

[0024] The following uses the drawing die clamp ring part to illustrate the internal rib design process. Figure 1-6 :

[0025] 1) Select a point on the surface

[0026] The pressing ring part of the drawing die is a U-shaped groove casting. Select a point PT1 on the surface of the U-shaped groove. Note that when selecting this point, please make it as close to the end face of the U-shaped groove as possible.

[0027] 2) Generate reference surface

[0028] Find all the boundary lines of the inner surface of the rib plate to be generated and extract the boundary line E1 closest to point PT1 and the entity B1 containing the inner surface; find the point PT2 closest to the boundary line E1 from point PT1; make a reference plane D1 through this point PT2 in the tangent direction of line E1;

[0029] At the same time, find out the side plane PL1 passing through point PT2 on the U-shaped groove surface to generate the reference plane D2 to prepare for the subsequent rib design.

[0030] 3) Generate bias curve

[0031] A. Use the reference plane D1 to intersect with the entity B1 to generate multiple intersection curves E2.

[0032] B. Filter out the curves whose midpoints in all intersecting curves E2 are at a distance of zero from the reference plane D2, and automatically stitch the remaining intersecting curves into multiple stitching curves; and select the stitching curve C1 passing through PT1.

[0033] C. Offset the stitching curve C1 outward by 20 mm to generate the offset curve C2. The purpose of this operation is to prevent gaps from being generated when the stitching curve is used to generate ribs and merged with non-vertical side wall surfaces.

[0034] 4) Generate a closed curve

[0035] Connect the starting point and the end point of the offset curve C2 into a straight line, sew it with the offset curve, and generate a closed curve C3.

[0036] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computers, available storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0037] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0038] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0039] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0040] Compiling the above method steps into a program and then storing it on a hard disk or other non-transitory storage medium constitutes the technical solution of "a non-transitory readable recording medium" of the present invention; and electrically connecting the storage medium to a computer processor and completing the modeling of the U-groove inner rib plate through data processing constitutes the technical solution of "a U-groove inner rib plate modeling system" of the present invention.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for modeling a U-shaped groove inner rib plate, characterized in that The following steps are involved: S1. Select a point (PT1) on the surface of the U-shaped groove where a rib plate needs to be added, and find the entity (B1) containing the surface and the boundary line (E1) closest to the point (PT1); S2. Determine the point (PT2) on the boundary line (E1) that is closest to the point (PT1), make a reference plane (D1) through the point (PT2) with the tangent direction of the boundary line (E1) as the normal, and make a reference plane (D2) through the point (PT2) that is perpendicular to the inner surface of the U-shaped groove and the reference plane (D1); S3. intersecting the reference plane (D1) and the entity (B1) to generate a plurality of intersecting curves, filtering out the intersecting curves whose midpoints are at zero distance from the reference plane (D2), and stitching the remaining intersecting curves into a plurality of stitching curves; S4. Select the stitching curve passing through the point (PT1), offset it in the direction of the entity (B1) to generate an offset curve, close the offset curve and stretch it tangentially along the boundary line (E1) to generate a rib plate model.

2. A U-shaped groove inner rib modeling method according to claim 1, characterized in that: The point (PT1) in step S1 is on the boundary of the inner surface of the U-shaped groove.

3. A U-shaped groove inner rib modeling method according to claim 1, characterized in that: The distance offset in the direction of the entity (B1) in step S4 can ensure that the offset curve is within the entity (B1) during the stretching process.

4. A non-transitory readable recording medium for storing one or more programs including a plurality of instructions, characterized in that: When the instruction is executed, the processing circuit will be caused to execute a U-groove inner rib plate modeling method as described in any one of claims 1-3.

5. A U-shaped groove inner rib plate modeling system, comprising a processing circuit and a memory electrically coupled thereto, characterized in that: The memory configuration stores at least one program, the program includes a plurality of instructions, and the processing circuit runs the program to execute a method for modeling a U-groove inner rib plate as described in any one of claims 1-3.

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