Tool and technique for machining long and narrow skin part

Abstract

The invention provides a technique for machining a long and narrow skin part. The machining scheme of a long and narrow skin is optimized on the aspects such as the clamping and cutting parameters and the technical scheme by adopting the technical method that roll bending and pit machining are conducted successively, the purposes of clamping of the dual-side-concave long and narrow skin and butt joint of the front side and the back side are achieved, the machining thickness tolerance and the position tolerance of the narrow and long skin are ensured, and the situation that concave areas crack as pit machining is conducted before roll bending is avoided. According to the technique for machining the long and narrow skin part, by adoption of the technical machining method that roll bending formation and vacuum adsorption unfolding are conducted successively, the adsorption stability in the machining process of the dual-side long and narrow skin is ensured; by designing the length and width standards of the front side and the back side, the location degrees of the part outline and the pit during machining of the front side and the back side can be quickly met, and high-quality and high-efficiency machining of the long and narrow skin is achieved.

Description

technical field [0001] The invention belongs to the technical field of numerical control processing, and in particular relates to a processing tool and technology for narrow and long skin parts. Background technique [0002] The narrow and long skin parts of large aircraft are aluminum-lithium alloy parts, which are required for large skin overlaps. The thickness is generally δ1.6mm~δ6.35mm, and the aspect ratio of the parts is ≥15. It belongs to the narrow and long skin. And this type of part is a double-sided sunken processing part with a curved surface and a thin-walled structure. On the one hand, this type of parts has poor rigidity, so vacuum adsorption processing is required, but due to the limited Z-axis machining stroke of the machine tool, and the complex design of the profile vacuum platform, high quality, and high cost, it is not suitable to use profile vacuum adsorption processing; on the other hand, the parts The material aluminum-lithium alloy is easily corrod...

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Problems solved by technology

[0003] What the present invention aims to solve is the technical problem that the narrow and long skin parts of the existing large aircraft are not easy to process. It provides a processing technology for the narrow and long skin parts. Optimize the narrow and long skin processing technology in several aspects such as the process plan, solve the problems of double-sided sagging narrow and long skin clamping and the front and back sides, ensure the processing thickness tolerance and position tolerance of the narrow and long skin, and prevent the first processing of the sagging and then rolling The problem of cracking in the subsidence area

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