Machining method of complex casting with non-circular cross section

Abstract

The invention discloses a machining method of a complex casting with a non-circular cross section. In the casting machining surface, through setting and machining of process margin and removal of the machining margin, the size and shape relationship between complex surfaces is established; through the measurement of wall thickness, a machined outer surface is used as a standard, layout inspection is conducted on the casting, and whether the size accuracy of a non-machined surface of the casting meets the requirements of subsequent machining or not is judged; a special tool is used for reducing heat treatment deformation of the casting; a rough machining standard of the casting is determined according to heat treatment detection data, and subsequent machining is conducted; analysis is conducted on the deformation trend and the deformation amount of all processes for casting manufacturing, anti-deformation design is conducted on the casting in advance, and the pass percent of the sizes of castings is improved. The machining method belongs to the field of casting, is high in universality and suitable for complex castings manufactured through various materials and various methods; the casting accuracy of the machining method is improved by one to three levels on the basis of an original casting method, the machining finished product rate is increased, energy consumption and the part manufacturing cost are lowered, and the manufacturing cycle is shortened.

Description

technical field [0001] The present invention relates to a processing method for castings, more specifically to a processing method for complex non-circular cross-section castings, which is suitable for processing complex castings of non-ferrous metals such as aluminum alloys and magnesium alloys and ferrous metals such as cast iron, cast steel and high-temperature alloys field. Background technique [0002] With the development of manufacturing industries such as aviation, aerospace, ships, weapons, and automobiles, many discrete parts have been welded or riveted in the past. In order to reduce structural weight, reduce costs, or increase overall rigidity and reliability, it is required to improve For integral casting, the requirements for castings are becoming more and more precise, complex and large. [0003] For complex parts with non-circular cross-sections, the high-precision surfaces such as the outer surface and assembly surface are generally guaranteed by subsequent...

AI Technical Summary

Problems solved by technology

[0004] 1. In the production of castings, the process flow is long, the process quality control is difficult, and the solidification sequence, thermal environment and mold deformation resistance of each part of the casting are different during the solidification process, so it is difficult to guarantee the dimensional accuracy of the casting;

[0005] 2. In the subsequent heat treatment, machining and other processes, the castings will also be deformed to varying degrees under the influence of stress, and the deformation trend and size are difficult to predict

[0006] Generally speaking, castings are machined to remove machining allowances to obtain parts, but for complex castings with non-circular cross-sections, due to the strong correlation between the structural dimensions of each part, in the inspection of each process, traditional dimension inspections such as ruler inspection and scribing There is a blind spot in the method, which cannot comprehensively and accurately reflect the actual dimensional accuracy and shape tolerance of the casting. Therefore, parts often have local wall thickness problems after machining, which cannot meet the requirements of the part drawings, and the positions of the wall thickness show great dispersion. The immediate cause is often not identified

As a result, complex castings with non-circular cross-sections are easily scrapped due to size out-of-tolerance during casting and subsequent processing, and the yield of parts is low and the manufacturing cost is high.

If the non-processed casting surface is used to increase the process subsidy, the weight of the part will greatly exceed the design index, and it will even affect the use of the part

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