Titanium alloy sectional material thermal stretching rotary straightening method

A titanium alloy and thermal stretching technology, which is applied in the field of thermal stretching and rotary straightening of titanium alloy profiles, can solve problems such as bending and torsion of titanium alloy profile products, and achieve the effect of high production flexibility

Inactive Publication Date: 2018-06-12
肖洒
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for thermal stretching and rotating straig

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Example one

[0026] TC4 titanium alloy extruded thin-walled T profile, cross-sectional area 160mm 2 , The length is 1000mm, and the yield strength is about 380MPa at 550℃. The straightening process of this profile is as follows:

[0027] (1) Select the T-shaped profile straightening fixture, and clamp the two ends of the titanium alloy profile on the straightening machine;

[0028] (2) Stretch the titanium alloy profile in the direction of the extension axis, the tensile load P=52KN, keep the load to ensure that the two ends of the profile are tight;

[0029] (3) Heat the titanium alloy profile to 550°C for 5 minutes;

[0030] (4) Under the condition of maintaining the tension, rotate with the normal direction of the section as the axis, so that the cross-sectional overlap angle difference between the two ends of the profile is -0.5°~0°, 0° indicates complete overlap, -0.5° indicates continued excessive twisting after overlap 0.5° angle;

[0031] (5) Maintain the angle of rotati...

Example Embodiment

[0035] Example two

[0036] TC4 titanium alloy extruded thick-walled L profile, cross-sectional area 2400mm 2 , The length is 2000mm, and the yield strength is about 200MPa at 850℃. The straightening process of the profile is as follows:

[0037] (1) Choose the L-shaped bar pull straightening fixture, and clamp the two ends of the titanium alloy profile on the straightening machine;

[0038] (2) Stretch the titanium alloy profile in the direction of the extension axis, the tensile load P=360KN, keep the load to ensure that the two ends of the profile are tight;

[0039] (3) Heat the titanium alloy profile to 850°C for 15 minutes;

[0040] (4) Under the condition of maintaining the tension, rotate with the normal direction of the section as the axis, so that the overlap angle difference of the cross section at both ends of the profile is -2°~-1°;

[0041] (5) Maintain the rotation angle, control the movement of the clamping end to slowly stretch the profile, and control the tensile strain...

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Abstract

The invention relates to a titanium alloy sectional material thermal stretching rotary straightening method and belongs to the field of nonferrous metal processing. The method comprises the steps of selecting a clamp according to the cross-section shape; clamping the two ends of a titanium alloy sectional material onto a straightening machine; conducting stretching in the extension axial directionof the titanium alloy sectional material to keep the two ends of the titanium alloy sectional material be tensioned; heating the titanium alloy sectional material uniformly and rapidly to the straightening temperature and then holding the temperature; rotating the titanium alloy sectional material with the normal direction of the cross section as the axis under the condition of maintaining the tensile force to enable the difference of the overlap angles of the cross sections of the two ends of the sectional material to be from minus two degrees to zero degree; keeping the rotating angle, stretching the titanium alloy sectional material slowing to generate slight plastic deformation and then keeping the tensile force; conducting furnace cooling or air cooling on the titanium alloy sectional material to reach the indoor temperature; unloading the clamped ends of the titanium alloy sectional material to complete straightening. The titanium alloy sectional material straightened through the method has the unevenness not more than 0.65*(L/300) mm and the twist degree not more than 2 degrees. Meanwhile, the problem that large-twist titanium alloy sectional materials cannot be straightened is solved. Compared with a three-point bending pressure straightening method, the titanium alloy sectional material thermal stretching rotary straightening method has the advantage that the production efficiency is higher.

Description

technical field [0001] The invention relates to a method of thermal stretching and rotating straightening of titanium alloy profiles, specifically, a method of applying tension to both ends of titanium alloy profiles heated to a certain temperature and rotating them simultaneously to correct their straightness and twist. The straightening method belongs to the field of nonferrous metal processing. Background technique [0002] Titanium alloy profile is a near-net-shape semi-finished product, which can be directly used as a component without processing or after a small amount of processing. It has the characteristics of high structural efficiency and is of great significance to the design of aerospace vehicles. Compared with aluminum alloy profiles or steel profiles, the number of single varieties required in the application field of titanium alloy profiles is small, but there are many grades, cross-sectional forms and specifications. Therefore, the extrusion method with the ...

Claims

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Application Information

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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 肖洒
Owner 肖洒
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