Milling method for double-sided frame part

Abstract

The invention discloses a milling method of a double-sided frame part. The method comprises the following steps: S1, roughly milling the upper surface and the lower surface of a blank to respectively obtain a frame surface A and a frame surface B, and enabling the process allowance of the frame surface B to be greater than the process allowance reserved by the frame surface A; S2, performing unstressed clamping, performing finish milling on the frame surface A, and machining to the theoretical size without the process allowance; and S3, performing finish milling on the frame surface B, using the top faces of ribs and edge strips of the frame surface A subjected to finish milling in the step S2 for positioning, and when a web plate is machined, milling the web plate from inside to outside by adopting axial milling without layering and taking the center of the sash of the frame surface B as the starting point. According to the method, the ribs and the edge strips of the frame surface A subjected to finish milling are used as positioning references for positioning, and an additional clamp is not needed; large process allowance is reserved when the frame surface B is obtained through rough milling, and the machining strength of the finish-milling frame surface is guaranteed; and axial milling is adopted, layering is avoided, machining is conducted from inside to outside in sequence, the problem that in the prior art, web plate machining vibrates and the web plate is damaged is solved, and the overall machining stability of the web plate is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of processing frame parts, and in particular relates to a milling method for double-sided frame parts. Background technique [0002] With the development of the aviation manufacturing industry, the requirements for the structural performance, manufacturing precision, surface quality and processing cost of the aircraft are constantly increasing. The current aeronautical structural parts gradually tend to be large-scale, integrated and complex. Its structural features have developed from the initial single-sided three-coordinates and a small number of sash structures to the current double-sided five-coordinates multi-sash structure. In order to ensure the processing requirements of such complex structural parts, special fixtures need to be customized, which greatly increases the manufacturing cost. [0003] Taking aluminum alloy frame parts as an example, such parts generally have structures such as double-s...

AI Technical Summary

Problems solved by technology

[0005] (1) The cost of special fixtures is too high, and its value is even several times or even ten times that of the parts themselves

[0006] (2) The installation and use of special fixtures are cumbersome, and some fixtures also need to lay sealing strips for the vacuum adsorption area, which is time-consuming and laborious

If things go on like this, more and more special fixtures will accumulate, resulting in a large occupation of factory space

[0008] The problems of high cost, cumbersome use, and space occupation caused by traditional process methods have seriously affected the production efficiency of structural parts, and cannot meet the huge demand of my country's rapidly developing military and civilian aircraft market. Therefore, it is important to design and develop better process methods. significance

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