A kind of processing method of aluminum alloy thin-wall cylindrical parts

Abstract

The invention discloses a processing method of an aluminum alloy thin-wall cylindrical part. The method comprises the following steps of blanking, tool selection, rough machining, excircle semi-finish machining, aging treatment, internal-hole semi-finish machining, internal-hole finish machining, excircle finish machining and the like. According to the method, as a special clamp is adopted to guarantee clamping precision, the clamping deformation is reduced and the internal stress of part processing is eliminated; moreover, the method is simple to operate; for a workpiece, procedures of keeping a technological chuck and removing the technological chuck are omitted, so that the material and the processing time are saved; meanwhile, the aluminum alloy thin-wall cylindrical part processed by using the method is stable in quality, low in processing cost and high in efficiency; in addition, the influence that a product generates deformation due to directly suffering three-point clamping force can also be avoided, the rotation heat stress deformation and the pressure damage can be reduced, the flexible deformation of the tools can be reduced, the raw material consumption of the product can be reduced, and the qualification rate and the production efficiency of the workpiece can be improved; moreover, the processing cost can be lowered.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a processing method for an aluminum alloy thin-walled cylindrical part. Background technique [0002] needs to be processed as figure 1 For the aluminum alloy thin-walled cylindrical parts shown, the product material is aluminum alloy LY12-CZ, the length is L, and the outer diameter is Inner diameter is Concentricity is mm, the cylindricity is The surface roughness Ra value was 1.6 μm. In addition to the relatively simple shape of such parts, the shape tolerance and surface roughness are relatively high, the wall thickness ≤2mm, and the part length L>440mm, is a typical thin-walled part. Because the wall is thin and the processing material is aluminum alloy, it is easy to deform during processing, mainly manifested in the radial deformation of the inner hole and the taper in the axial direction, and the quality is not easy to guarantee. [0003] The proc...

AI Technical Summary

Problems solved by technology

In the process of processing, due to the influence of cutting force, cutting heat, residual pressure stress, clamping force and other factors, processing deformation will occur, which has a great impact on the processing accuracy and surface finish of parts, and it is easy to cause scrapping, especially for car parts. In the inner hole, due to the unstable clamping and the soft aluminum alloy material, the product is directly deformed by the three-point clamping force, resulting in the following problems in the inner hole processing that cannot meet the technical requirements: the inner hole is elliptical, and the roundness error >0.14mm; the inner hole is trumpet-shaped, and the taper error is >0.21mm

Due to the large roundness error or taper error in the inner hole, the wall thickness of the product will be uneven after processing, and a large number of defective or waste products will be produced, which will increase the consumption of raw materials and increase the cost of the product; in addition, there are Problems such as rotation thermal stress deformation and crushing, tool flexible deformation, etc., greatly reduce the product qualification rate

At present, it is mainly to use multiple heat treatments to improve the strength of the parts, improve the cutting performance, and use multiple clamping and trimming to ensure the dimensional accuracy of the parts. Although these methods can improve the processing deformation of aluminum alloy thin-walled parts to a certain extent, But the process is complicated and the processing cost is high

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