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Numerical simulation of scrap trimming operations in sheet metal forming

A metal sheet, trimming technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as error-prone, manual creation, etc.

Active Publication Date: 2016-07-27
LIVERMORE SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prior art methods require many manual steps which are particularly annoying and thus prone to error
In one prior art approach, separate computer models of each waste section need to be created manually, often requiring inferential expertise

Method used

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  • Numerical simulation of scrap trimming operations in sheet metal forming
  • Numerical simulation of scrap trimming operations in sheet metal forming
  • Numerical simulation of scrap trimming operations in sheet metal forming

Examples

Experimental program
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Effect test

Embodiment Construction

[0024] First refer to Figures 1A-1B , which collectively illustrate a flowchart of an exemplary process 100 for performing a time-marching simulation of scrap trimming operations in sheet metal forming in accordance with embodiments of the present invention.

[0025] Process 100 begins at act 102 with a computer system on which an application module is installed (eg, Figure 10 The computer system 100) receives a definition of a FEA model and trimming operation settings, the FEA model containing a plurality of finite elements (eg, two-dimensional shell elements) to represent the stamped sheet metal before the scrap portion is trimmed. The FEA model may be a sheet metal model obtained after a numerically simulated stamping operation. The trimming operation setup includes a computer model of at least one trimming steel and at least one trimming post, and at least one other mold structure (eg, a waste chute). The computer model of each of the at least one trimming steel include...

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PUM

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Abstract

FEA model representing a stamped sheet metal before trimming and a trimming operation setup are received. Each trim steel contains a set of cutting-edge nodes associated with a trim vector. At least one trim line is established by projecting cutting-edge nodes onto the FEA model according to the trim vector. Numerically-constrained node-pairs along the trim line are created at intersections with edges of crossed finite elements. The FEA model is modified by splitting crossed finite elements to preserve the original geometry and to ensure numerical stability. New finite elements are defined using one of the nodes in corresponding node-pairs such that no finite element straddles the trim line. At each solution cycle of a time-marching simulation of trimming operations, the numerical constraint is released for each node-pair determined to be reached by one of the cutting-edge nodes. Simulated structural behaviors are obtained as the scrap portion(s) deforms and falls accordingly.

Description

technical field [0001] The present invention relates generally to computer-aided engineering analysis for simulating sheet metal forming or stamping processes (eg, deep drawing), and more particularly to methods for performing time-advanced simulations of scrap trimming operations in sheet metal forming and system. Background technique [0002] Sheet metal forming has been used in the industry for many years to generate metal parts from blank sheet metal, for example, automakers and their suppliers can use sheet metal forming to produce many parts. One of the most common sheet metal forming processes is called stretch forming or stamping. [0003] Typically, after a blank sheet metal is formed into a drawn part (or stamped sheet metal), the drawn part includes a trimmed portion (the portion desired to remain, or sometimes referred to as a parent portion), and at least one scrap portion ( undesired extra material). At least one scrap portion is trimmed or cut away in a tri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2113/22G06F2113/24
Inventor 朱新海张力
Owner LIVERMORE SOFTWARE TECH
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