Registration and alignment-based lineation-free forging-casting part machining positioning method

Abstract

The invention relates to a registration and alignment-based lineation-free forging-casting part machining positioning method. Since an aviation forging-casting part is complex in structure, smaller in machining margin and poor in blank consistency, if a traditional mode in which lineation is adopt to find machining references is used, problems such as poor positioning accuracy, low alignment efficiency and high rejection rate can be brought about, and those problems are the bottleneck of the machining of forging-casting piece blanks, and seriously hinder the intelligent, automated and numerical control development of the machining modes of forging-casting pieces. In order to solve the above problems, a measurement coordinate system and a machining coordinate system are unified; registration and alignment are performed on the digital model of the blanks and the CAD model of the blanks under residual constraint; a cutter location file is corrected through using a registration and alignment result; machining references can be determined accurately and automatically; after the accurate references are prepared, a lineation alignment auxiliary preparation process at a later stage is not required, and the prepared accurate references can be directly utilized to carry out quick and accurate positioning; and therefore, the automation degree and numerical control rate of the machining of the forging-casting piece blanks can be improved.

Description

technical field [0001] The invention relates to a marking-free forging and casting processing positioning method based on registration and alignment, in particular to a method for determining machining process benchmarks of complex forging and casting blanks, and belongs to the technical field of mechanical processing. Background technique [0002] At present, due to the significant advantages of light weight, structural efficiency and high reliability of integral structural components, integral structural components are widely used in the main load-bearing structural parts of aviation, aerospace, automobiles, and ships. The overall structural part is not a simple combination of parts, but a blank close to the design model is obtained by casting or forging, and then the key surface is subjected to small margin CNC finishing to obtain the final product. For complex overall structural parts, since there is no processing datum that can be positioned on the blank, it is extremel...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: due to the complex structure of aviation complex forgings and castings, small machining allowance, and poor consistency of blanks, the traditional way of scribing to find processing references has poor positioning accuracy, low alignment efficiency, and processing costs. This problem is the bottleneck in the processing of forging and casting rough mechanical parts, which seriously hinders the development of intelligence, automation and numerical control in the processing mode of such parts