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Precise forming method for large-size variable-curvature thin-wall storage tank diaphragm

A technology of precision molding and variable curvature, which is applied in the field of precision molding of large-size variable-curvature thin-wall tank diaphragms, and can solve the problems of difficult and difficult-to-achieve large-size variable-curvature thin-wall tank diaphragm forming processes , to achieve the effect of solving the problem of forming processing technology, less spinning passes, and preventing deformation

Active Publication Date: 2021-07-02
GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]The technical problem to be solved by the present invention is: in order to solve the difficult problem of forming and processing large-scale variable curvature thin-wall tank diaphragm, break through the large-scale complex variable curvature thin-walled diaphragm The overall precision forming of the wall structure, low cost and technical bottlenecks in engineering applications overcome the difficulties in forming, measuring and clamping that are difficult to achieve with ordinary methods

Method used

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  • Precise forming method for large-size variable-curvature thin-wall storage tank diaphragm
  • Precise forming method for large-size variable-curvature thin-wall storage tank diaphragm
  • Precise forming method for large-size variable-curvature thin-wall storage tank diaphragm

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Embodiment

[0032] In this embodiment, the maximum diameter of the large-size variable-curvature thin-wall tank diaphragm is The roundness is 0.1mm, and the wall thickness gradually changes from 1.8mm to about 1mm. The tank diaphragm requires high dimensional accuracy, and the forming process is extremely difficult, especially the material used is pure titanium, which has low strength and is easy to deform during forming process. And titanium starts to absorb hydrogen from 250°C and oxygen from 400°C, so industrial pure titanium is easily polluted by impurities and becomes brittle during processing and forming. Hot forming is required during processing, which further increases the difficulty of forming processing; this application intends to use a special thickness gauge to measure the thickness and design and manufacture a special tooling fixture for spinning processing and forming. The roundness can reach 0.1mm, and the spherical profile can reach 0.2mm. Tensile strength σ b Not less t...

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Abstract

The invention discloses a precise forming method for a large-size variable-curvature thin-wall storage tank diaphragm. The precise forming method comprises the following steps that a circular plate-shaped blank is spun into a hemispherical shell with a flanging on the end surface; a plane reference of the end surface is processed after heat treatment; an outer spherical surface reference is processed by using the plane reference; an inner spherical surface, a flanging outer spherical surface and a maximum outer circular surface are processed by using the outer spherical surface reference; and an outer spherical surface and a flanging inner spherical surface are processed by using the plane reference. Compared with traditional punch forming, by means of spinning forming, raw materials can be greatly saved, forming processing can be carried out through thin blanks, a special tool clamp is designed and manufactured, a vacuum suction cup is adopted for adsorption, and the problems of thickness control and clamping of a large-size variable-curvature thin-wall part are successfully solved; and through precise matching of the spherical tool and the inner and outer spherical surfaces of the part, the deformation problem of the thin-wall part during processing is effectively solved.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a processing technology for precise forming of a large-size variable curvature thin-wall tank diaphragm. Background technique [0002] In 2018, the launch activities in the field of global space transportation were very active, surpassing the record of 100 launches for the first time, and a total of 114 launch missions were carried out. On the satellite demand side, the 14th Five-Year Plan is the explosive period of China's satellite launches, and medium and large liquid rockets will be the best choice. [0003] The attitude-orbit control propulsion system plays an important role in various spacecraft, that is, to maintain the stability of the orbit and attitude of the spacecraft. The storage tank is one of the most critical parts in the power system, and its manufacturing and processing quality directly affect the service performance of the entire propulsion system. Wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 张书权谭乐王钦伟赵源钟文凯刘邦森戈军委周之贵符书豪罗鑫
Owner GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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