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Process method for reducing stress and deformation of helicopter chemical milling sheet metal parts

A technology of stress deformation and process method, which is applied in the field of milling and forming of flat sheet metal parts, can solve problems such as deformation of flat milling parts, and achieve the effects of improving quality, saving production costs and reducing product scrap rate.

Active Publication Date: 2017-11-24
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to better solve the deformation problem of flat plate milling parts, after repeated tests, we proposed the method of double-sided milling of pre-stretched plates to solve such problems

Method used

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Examples

Experimental program
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Embodiment Construction

[0011] A process method for reducing the stress deformation of a helicopter chemical milling sheet metal part, the method includes:

[0012] Considering the selection of raw materials, the internal stress of the sheet is relatively small. After research and testing, it is found that the internal stress of the pre-stretched sheet 2024 T3 ASNA3482 is much smaller, and the internal stress has been released by stretching when processing the sheet. stress.

[0013] From the perspective of the chemical milling process, it can be integrated and partial, or single-sided and double-sided. In the process of chemical milling, double-sided chemical milling is uniformly adopted, and the method of releasing stress at the same time achieves the purpose of reducing deformation. Even if the part is a single-sided partial chemical-milled part, one side of the chemical-milling area is processed as a whole, and then the local chemical-milled part is processed, and the other side has no chemical-m...

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Abstract

The invention belongs to the field of chemical milling and moulding of flat sheet metal parts, and relates to a moulding technological method capable of reducing the stress deformation of chemically-milled sheet metal members. The technological method is characterized in that the raw material should be a plate with a small inner stress such as a pre-stretched plate (2024 T3 ASNA 3482); a dual-face chemical milling method is adopted in the chemical milling step, and the stress is released at the same time. The provided method can reduce the defects formed during the moulding process such as rolling and severe unevenness on flat chemically-milled sheet metal parts; thus the quality of parts is improved, the product rejection rate is reduced, and the production cost is saved therefore. The part rejection rate due to the forming defects is reduced from 90% to 3%.

Description

technical field [0001] The invention belongs to the category of chemical milling forming technology of flat sheet metal parts, and relates to providing a forming technology method for reducing stress deformation of chemical milling parts. Background technique [0002] For helicopters, flat milled sheet metal parts are used for structural bonding to form the fuselage ceiling and floor support components. There are more than 60 types, and all of them are relatively large, which are important supporting parts. If the material of 2024 T3ASNA3010 is used, due to the uneven local thinning and stress release after chemical milling, the parts will be deformed rapidly. content of the invention [0003] In order to better solve the deformation problem of flat plate milling parts, after repeated tests, we proposed the method of double-sided milling of pre-stretched plates to solve such problems. [0004] A process method for reducing the stress deformation of a helicopter chemical m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/00C23F1/02
Inventor 栗建君伞永秋
Owner HARBIN