Wall thickness homogenization method adopting isothermal stamping for titanium alloy thick-wall spherical shell

Abstract

The invention discloses a wall thickness homogenization method adopting isothermal stamping for a titanium alloy thick-wall spherical shell. Through divisional design on friction coefficients of a male die and a to-be-formed plate, the male die and pull rings are heated separately so that a temperature gradient is formed, the wall thickness homogenization of the titanium alloy thick-wall sphericalshell is ensured, the spherical bottom reduction rate is reduced from 50% in conventional forming to below 15%, the overall wall thickness fluctuation of a housing does not exceeds 30% of the wall thickness of a blank and the size is stable. Since the reduction of the spherical bottom is inhibited effectively, the extent of damage of the mechanical property at the spherical bottom is reduced substantially, the overall mechanical property of the titanium alloy thick-wall spherical shell is better, the titanium alloy thick-wall spherical shell is particularly applicable to development and production of a TA7 low-temperature titanium alloy gas cylinder product for a carrier rocket, and is also applicable to the development and production of titanium alloys in other fields and other trademarks and the like products, and the wall thickness homogenization method is very practical.

Description

technical field [0001] The invention relates to a method for homogenizing the wall thickness of a titanium alloy thick-walled spherical shell by isothermal stamping, and belongs to the technical field of plastic processing. Background technique [0002] Due to its excellent low temperature performance, TA7 titanium alloy has been widely used in the cold helium cylinder of the launch vehicle. The traditional process generally uses forging to form the hemispherical shell, but with the development of the model, the size of the newly developed rocket cylinder gradually increases. The difficulty and risk of the forging process have increased sharply, so a new process is urgently needed to realize the forming of the TA7 spherical shell and replace the traditional forging process. [0003] Isothermal stamping is an advanced plastic forming technology. It is similar to superplastic forming. During the forming process, the temperature of the material remains stable and controllable. ...

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Problems solved by technology

[0005] In summary, the wall thickness control technology has been applied in the superplastic forming process and hot stamping process of titanium alloy, steel and other materials at home and abroad, but there is no effective application of the wall thickness uniformization technology in the TA7 titanium alloy thick-walled hemisphere. Related reports on shell isothermal stamping

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