STL file format based main progressive forming direction determination method

Abstract

The invention discloses an STL file format based main progressive forming direction determination method. By using a triangular patch outer-normal vector in an STL file format, a basis is provided for selecting a reasonable forming position for a progressive forming part. The method has the beneficial effects that 1) traditional main progressive forming direction selection has great randomness and cannot ensure smooth progressive forming of the part; the method can effectively control each position forming corner of the part to be within the range of a forming limit angle, thereby ensuring smooth forming of the part; 2) thickness uniformity of different positions of the part can be effectively controlled and realized, and the strength, stiffness and subsequent assembly condition of the part can be improved; 3) for a special thickness requirement of a special position of the part, control can be performed in advance to select a reasonable main forming direction; and 4) improvement of material thickness distribution can improve the adaptability of a progressive forming process and facilitate popularization and use of the progressive forming technique in actual production.

Description

technical field [0001] The invention relates to a method for judging the main direction of incremental forming of sheet metal parts, in particular to a method for judging the main direction of incremental forming based on the STL file format. Background technique [0002] Incremental Sheet Forming (ISF) is a moldless flexible forming technology proposed by Leszak of the United States in the 1960s. In the 1990s, Matsubara Shigeo of Japan conducted further research on this technology, which gradually attracted the attention of scholars from various countries. Pay attention to. Incremental forming technology is an advanced manufacturing technology based on computer technology, numerical control technology and plastic forming technology. It uses the idea of ​​"layered manufacturing" of rapid prototyping technology to discretize the three-dimensional model into a series of two-dimensional contour shapes. A flexible moldless forming technology that obtains the overall shape of th...

AI Technical Summary

Problems solved by technology

At present, the decision-making of the main direction of forming of incrementally formed parts is mainly done manually by the operator based on experience, which has great randomness and uncertainty. For more complex incrementally formed parts, it is difficult to control the forming thickness of each position of the part. Easy to achieve ideal parts processing effect

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