Method for improving surface quality of titanium and titanium alloy pipes and drawing die

A titanium alloy, high-quality technology, used in wire drawing dies and other directions to reduce oil removal, improve internal and external surface quality, and simple structure

Inactive Publication Date: 2012-08-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium and titanium alloys have a close-packed hexagonal structure at room temperature, and there are few slip systems that can participate in deformation. During plastic deformation, the orientation of each grain will also undergo directional rotation to form a texture. The establishment puts forward very high requirements, especially the bottleneck of thinning and drawing of small-caliber (Φ6~20mm) titanium pipes, which has not been overcome in China for many years

Method used

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  • Method for improving surface quality of titanium and titanium alloy pipes and drawing die
  • Method for improving surface quality of titanium and titanium alloy pipes and drawing die
  • Method for improving surface quality of titanium and titanium alloy pipes and drawing die

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the drawing die of this embodiment includes an outer mold 1 for determining the outer diameter of the pipe material 3 and a floating core 2 for determining the inner diameter of the pipe material 3, and the outer mold half-cone angle α of the outer mold 1 is 10 °, the length of the sizing section-5 of the outer mold 1 is 0.5mm, and the radius R of the transition arc between the conical section 4 and the sizing section-5 of the outer mold 1 is 5mm; The core head half cone angle β of the core head 2 is 5°, and the length of the sizing section 2 6 of the moving core head 2 is 0.5 mm.

[0025] In this embodiment, the method for improving the surface quality of titanium pipes by using the above-mentioned drawing dies is as follows: select TA18 cold-rolled pipes with the chemical composition meeting the requirements of the GB / T3520.2-2007 standard, and the pipes are pickled and dried. Conventional heat treatment at 700°C / 1.5h to form a dense oxide ...

Embodiment 2

[0028] Such as figure 1 As shown, the drawing die of this embodiment includes an outer die 1 for determining the outer diameter of the pipe material 3 and a floating core 2 for determining the inner diameter of the pipe material 3, and the outer die half-cone angle α of the outer die 1 is 20 °, the length of the sizing section-5 of the outer mold 1 is 3mm, and the radius R of the transitional arc between the conical section 4 and the sizing section-5 of the outer mold 1 is 8mm; The core head semi-cone angle β of the head 2 is 18°, and the length of the sizing section 2 6 of the moving core head 2 is 5 mm.

[0029] In this embodiment, the method for improving the surface quality of titanium alloy pipes by using the above-mentioned drawing dies is as follows: select TA2 cold-rolled pipes with a chemical composition that meets the requirements of the GB / T3520.2-2007 standard, and degrease and pickle the pipes Dry in the air, and carry out conventional heat treatment at 600°C / 1h ...

Embodiment 3

[0032] Such as figure 1 As shown, the drawing die of this embodiment includes an outer die 1 for determining the outer diameter of the pipe material 3 and a floating core 2 for determining the inner diameter of the pipe material 3, and the outer die half-cone angle α of the outer die 1 is 15 °, the length of the sizing section-5 of the outer mold 1 is 2mm, and the radius R of the transition arc between the conical section 4 and the sizing section-5 of the outer mold 1 is 6mm; The core head semi-cone angle β of the head 2 is 9°, and the length of the sizing section 2 6 of the moving core head 2 is 3 mm.

[0033]In this embodiment, the method for improving the surface quality of titanium alloy pipes by using the above-mentioned drawing dies is as follows: select TA16 alloy cold-rolled pipes with the chemical composition meeting the requirements of GB / T3520.2-2007 standard, and carry out degreasing treatment on the pipes And 700℃ / 1.5h conventional heat treatment, so that a layer...

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Abstract

The invention discloses a drawing die comprising an outer die for determining the outer diameter of a pipe and a movable core print for determining the inner diameter of the pipe, wherein the outer die half-cone angle alpha of the outer die is 10-20 degrees; the fixed-diameter section 1 of the outer die is 0.5mm-3mm long; the radius R of a transitional circular arc between the conical section and the fixed-diameter section 1 of the outer die is 5mm-8mm; the core print half-cone angle beta of the core print is 5-18 degrees; and the fixed-diameter section 2 of the movable core print is 0.5mm-5mm long. The invention also discloses a method for improving the surface quality of titanium and titanium alloy pipes by using the drawing die. With the drawing die provided in the invention, surface rolling friction in the traditional cold rolling deformation of the titanium and titanium alloy pipes can be changed into sliding friction; therefore, the shortcomings of pipe surface pits, wrinkles, microcracks and the like easily caused by repeated rolling compaction of the die during rolling are reduced, and the purpose of improving the quality of both the inner surface and the outer surface of the pipes is achieved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal material processing, and in particular relates to a method for improving the surface quality of titanium and titanium alloy pipes and a drawing die. Background technique [0002] With the rapid development of the aerospace industry, modern aircraft and engines have higher and higher performance requirements, especially higher requirements for weight reduction indicators. Due to the advantages of high specific strength, good corrosion resistance, non-magnetism, and small linear expansion coefficient, titanium and titanium alloy pipes have been widely used in various aircraft and engine lubrication and fuel piping systems at home and abroad. Usually, the titanium and titanium alloy pipes used in aviation pipeline systems are small in size (diameter not greater than 20mm), and the working conditions are harsh. Therefore, the technical requirements for the selection of titanium pipes are extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C3/02B21C1/22
Inventor 杨英丽郭荻子罗媛媛苏航标吴金平赵彬赵恒章卢亚锋邢健贠鹏飞
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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