Method for manufacturing large size, thin walled cap seal head made from TC4 titanium alloy with high precision

Abstract

The invention relates to a manufacture method for large size thin wall high accurate TC4 Ti alloy end plate. It adopts strong rotating and multi-times normal rotating method to insure the accuracy of product. It takes stability process between rough turning and refined turning to conquer the influence of residual stress of component and improve accuracy of product. The manufacture process does not need many moulds. It is suitable for manufacturing large size thin wall high accurate TC4 Ti alloy.

Description

technical field [0001] The invention belongs to a method for manufacturing a head, in particular to a method for manufacturing a thin-walled TC4 titanium alloy head. Background technique [0002] The large-size thin-wall high-precision TC4 titanium alloy head is an important structural part of the manned space station. TC4 titanium alloy has high strength at room temperature, low plasticity, large elastic modulus, poor processing technology, and must be formed under high temperature conditions. If hot stamping or high-temperature forging is used for the preparation of large-size thin-walled high-precision TC4 titanium alloy heads, and then machining methods, there are the following problems: using hot stamping and machining processes, multiple sets of molds must be used to complete stamping in multiple times , and the TC4 titanium alloy raw material must be coated before stamping, and the cladding layer must be removed after stamping, so the manufacturing cost is high and t...

AI Technical Summary

Problems solved by technology

TC4 titanium alloy has high strength at room temperature, low plasticity, large elastic modulus, poor processing technology, and must be formed under high temperature conditions

If hot stamping or high-temperature forging is used for the preparation of large-size thin-walled high-precision TC4 titanium alloy heads, and then machining methods, there are the following problems: using hot stamping and machining processes, multiple sets of molds must be used to complete stamping in multiple times , and the TC4 titanium alloy raw material must be coated before stamping, and the cladding layer must be removed after stamping, so the manufacturing cost is high and the efficiency is low, and stamping is the overall stretching of the billet, the billet has a large rebound and the material is damaged , the accuracy of stamping parts is low; using forging and machining processes, forging dies with large punches and dies must also be used, after many forgings into thick-walled die forgings, and then turned into shapes, the cost is high, the efficiency is low, and Due to the large size of the head and the uneven forging structure, after the inner and outer surfaces of the forged thick-walled die forging are turned, the performance of the center layer is low, which is difficult to meet the use requirements, and the forging die forging has a large machining allowance, serious deformation, and low part precision; In addition, stamping or forging re-machining methods are often limited by equipment, requiring large-tonnage hot stamping machine tools or forging equipment and large heating furnaces

The literature only mentions spinning forming A3 steel thick heads, and does not involve product accuracy and performance requirements, and A3 steel has low strength and good plasticity, and spinning processing is much easier than TC4 titanium alloy

[0005] At present, there is no literature report on the manufacturing method of the thin-walled TC4 titanium alloy head of the membrane box storage tank at home and abroad