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

A high-precision, large-scale technology, applied in the direction of manufacturing tools, metal processing equipment, heat treatment process control, etc., can solve problems such as high strength, low efficiency, deformation, etc., to overcome low precision, overcome residual stress, and reduce manufacturing costs Effect

Active Publication Date: 2009-09-23
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for manufacturing a large-scale thin-walled high-precision TC4 titanium alloy head, which comprises the following steps:

[0018] (1) Strong rotation once: select a blank with a thickness of 10mm, and prepare a circular plate blank with a center positioning hole and a diameter of Φ650mm; preheat the mandrel to 200°C with an oxygen-acetylene torch, and clamp the blank On the preheated mandrel, there is a machining allowance of 0.5mm for the tooling surface relative to the head surface, and the entire blank is preheated to 300°C, and then the parts to be spun are heated to 750°C, and then Strong rotation to 30% of the maximum deformation. The principle of the spinning machine is to control the amount of deformation, adjust the gap corresponding to the amount of deformation, and press the blank to achieve the required size, instead of achieving the required size by controlling the pressure value. For the spinning process, the amount of deformation through the spin...

Embodiment 2

[0026] A method for manufacturing a large-scale thin-walled high-precision TC4 titanium alloy head, which comprises the following steps:

[0027] (1) Strong rotation once: select a blank with a thickness of 15mm, and prepare a circular plate blank with a center positioning hole and a diameter of Φ850mm; preheat the mandrel to 350°C with an oxygen-acetylene torch, and clamp the blank On the preheated mandrel, a machining allowance of 1 mm is left on the surface of the tooling relative to the surface of the head, and the entire blank is preheated to 500°C, and then heated to 900°C for the parts to be spun, and then strengthened. Rotate to 45% of the maximum deformation;

[0028] (2) Multi-pass general rotation: the blank obtained in step (1) is subjected to 6 passes of general rotation at a temperature of 900°C, so that the undeformed flange area of ​​the strong-rotation blank is attached to the mandrel, shrink to form a semi-finished head;

[0029] (3) Strong rotation again: ...

Embodiment 3

[0035] A method for manufacturing a large-scale thin-walled high-precision TC4 titanium alloy head, which comprises the following steps:

[0036] (1) Strong rotation once: select a blank with a thickness of 12mm, and prepare it into a circular plate blank with a center positioning hole and a diameter of Φ750mm; preheat the mandrel to 280°C with an oxygen-acetylene torch, and clamp the blank On the preheated mandrel, there is a machining allowance of 0.8mm for the tooling surface relative to the head surface, and the entire blank is preheated to 400°C, and then heated to 820°C for the spinning parts, and then Strong rotation to 38% of the maximum deformation;

[0037] (2) Multi-pass general rotation: the blank obtained in step (1) is subjected to 5 passes of general rotation at a temperature of 800°C, so that the undeformed flange area of ​​the strong-rotation blank is attached to the mandrel, shrink to form a semi-finished head;

[0038] (3) Strong rotation again: the semi-f...

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PUM

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Abstract

The invention belongs to a method for manufacturing a head, in particular to a method for manufacturing a large-sized thin-walled high-precision TC4 titanium alloy head. It is characterized in that it adopts the spinning method of strong spinning, multi-pass general spinning, and strong spinning again, which overcomes the shortcomings of low precision of stamping or forging parts and improves the precision of products; stabilizes between rough turning and finishing turning The processing overcomes the influence of the residual stress of the parts and also improves the precision of the product. In addition, since multiple sets of molds are not required in the manufacturing process, the manufacturing cost is reduced. The invention is suitable for the manufacture of large-scale thin-walled high-precision TC4 titanium 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B21D22/14B21D37/16C21D1/26C21D1/00C21D11/00
Inventor 吕宏军王琪李启军范文利及可然王俊虎
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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