Machining method for incrementally forming complex part through engineering tailor-welded blanks

Abstract

The invention discloses a machining method for incrementally forming a complex part through engineering tailor-welded blanks. The machining method includes the steps that (1) a three-dimensional model of the part is established and the main normal direction of the model is determined; (2) a uniform-thickness parameter curve of the engineering tailor-welded blanks is determined; (3) a welding joint contour line of the engineering tailor-welded blanks is determined; (4) the thickness of the thick engineering tailor-welded blank in the engineering tailor-welded blanks of different thicknesses is determined; (5) the engineering tailor-welded blanks are machined and the surfaces of welding joints are polished and thermally treated in the later period; (6) incremental forming is finished. According to the machining method, a sheet metal part which is difficult to incrementally form through common boards can be effectively machined, under the condition that the forming angle is unchanged, the partial thickness of the formed part can be increased, the strength and the rigidity of the part are improved, welding joint deviation generated in the machining process is well avoided, the forming performance of the engineering tailor-welded blanks is brought into full play, the defects caused by the fact that the material thickness is reduced in the incremental forming process can be effectively overcome, the adaptability of the incremental forming process is improved, and application and popularization of the incremental forming technology in actual production are facilitated.

Description

technical field [0001] The invention relates to a tailor-welded blank forming method for sheet metal parts, in particular to a processing method for realizing progressive forming of complex parts by using engineering tailor-welded blanks, and belongs to the technical field of mechanical processing. Background technique [0002] Sheet metal numerical control progressive forming technology is an advanced manufacturing technology based on computer technology, numerical control technology and plastic forming technology. Direction discretization, that is, decomposing into a series of two-dimensional layers, and performing local processing on these two-dimensional layers. This layered incremental forming method for sheet metal does not require one-to-one corresponding molds, and the shape and structure of the parts are correspondingly unconstrained. Forming potential, which can greatly increase the forming limit of the sheet, has the characteristics of high flexibility, low cost,...

AI Technical Summary

Problems solved by technology

The above method has the following problems: the wall thickness of the multi-pass progressive forming material is seriously thinned, although it is barely formed, it cannot meet the requirements of the parts in terms of strength, stiffness and other mechanical and mechanical properties; although block forming can effectively avoid sheet forming However, due to the large elastic distortion caused by the release of internal stress during the cutting process after each part is formed, forced orthopedic welding must be carried out through tooling. The welded parts will have more complex internal stress, which will affect the parts. The use performance and appearance are beautiful; at the same time, the welding parts are cut and thinned due to different thicknesses, and the quality of the welds is difficult to guarantee

The above-mentioned problems can be effectively avoided by using different incremental forming performance plates or homogeneous and poor thick plates in tailor-welded blanks. However, so far, there is no systematic process for processing incrementally formed parts with tailor-welded blanks. Limit the promotion and use of incremental forming process

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