Method for achieving reverse modeling by using post program

Abstract

The invention relates to a method for achieving reverse modeling by using a post program. The method includes the steps that first, cutter parameters are determined; second, the parameters are input to the post program and are substituted into a numerical control machining simulation system, and an IGES formatted file is output from a demonstration result by the aid of an Export Model function; third, CatiaV5.0 software is used for opening the IGES formatted file, and a curved surface piece digital analog is generated into a three-dimensional digital analog; fourth, the newly generated three-dimensional digital analog is substituted into VERICUT software, the post program is used for forming a cutter path on the newly generated three-dimensional digital analog, adjusting is carried out, and the three-dimensional digital analog which is the same as actual parts is generated. Based on the post program, reversal design is achieved in the method, the digital analog of parts to be processed is generated, the method is high in accuracy rate, strong in operability and reliable in technology, the design and development period of products is shortened, and the cost and the risk for developing new products of enterprises are lowered.

Description

technical field [0001] The invention relates to a reverse modeling method using post-program, which is used in numerical control processing of large structural parts lacking digital models. Background technique [0002] The process of product forward design starts from conceptual design to CAD modeling, NC programming, NC machining, and finally forms new products. It is long and costly, which is not conducive to product research and development, because it is impossible to fully predict what problems will arise in the design of the product. It is in this context that the reverse design method is naturally developed and formed. [0003] The general reverse modeling method is to use a three-dimensional coordinate measuring machine to measure the shape of the inspection fixture and the sample, use the point cloud function of CAD software to form the shape surface, and rely on the principle of simulation approximation of forming a line with points and then forming a surface with...

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Problems solved by technology

[0002] The process of product forward design starts from conceptual design to CAD modeling, NC programming, NC machining, and finally forms new products. It is long and costly, which is not conducive to product research and development, because it is impossible to fully predict what problems will arise in the design of the product. It is in this context that the reverse design method is naturally developed and formed.

[0003] The general reverse modeling method is to use a three-dimensional coordinate measuring machine to measure the shape of the inspection fixture and the sample, use the point cloud function of CAD software to form the shape surface, and rely on the principle of simulation approximation of forming a line with points and then forming a surface with lines. This is a simulation In the process of mass transmission, the accumulation of the three errors of clamping error, measurement error, and point cloud command calculation error will inevitably produce a certain error, so the curved surface after the reverse establishment is an analog approximation, and the digital model cannot be used as the basis for direct processing. , which needs to be verified by trial cutting

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