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Method for rolling high-precision titanium alloy pipes

A titanium alloy, high-precision technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve unsatisfactory problems and achieve the effects of reducing rolling defects, improving dimensional accuracy, and eliminating bumps

Active Publication Date: 2014-11-19
宁夏中色金航钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The roughness of the outer surface of the TA18 aerospace titanium tube processed by this patent method is Ra≤0.8μm, the roughness of the inner surface is Ra≤1.6μm, the tolerance of the outer diameter is not more than 0.05mm, the tolerance of the inner diameter is not more than 0.04mm, and the wall thickness The dimensional tolerance is no more than 5% of the nominal wall thickness, the result is relatively good, but not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] TA18 φ70×5mm is used to extrude the tube blank, and it is produced by LG60 two-roll cold rolling mill and LD60 three-roll cold rolling mill to produce φ35×3.5mm. The rolling method is single-feed and double-rotation (single-feed and double-rotation refers to one feed in one rolling cycle of the rolling mill, and one rotation of about 57° at the front and rear dead centers.), two The Q value of roll rolling is 0.41-0.47, the Q value of three-roll rolling is 0.5-1.46, and the gap is 0.2-1mm. When rolling, the chlorinated paraffin is used as the inner wall lubricant, and the mixture of engine oil and paraffin is used as the outer wall lubricant (weight ratio 8-10:1). After rolling, the pipe is ultrasonically cleaned and degreased before heat treatment, and then pickled (HF: HNO 3 :H 2 O=5~12:45~60:100 (volume ratio) mixed solution, soak for 3~10min), wash and dry. After one pass of rolling, the inner surface is bored. After each rolling pass, the heat treatment system ...

Embodiment 2

[0030] TA18 φ90×10mm cross-rolled perforated tube billet is used to produce φ20×1mm through LG120, LG60, LG30 two-roll cold-rolling mills and LD60, LD30 three-roll cold-rolling mills. The rolling method is single-feed and double-rotation (single-feed and double-rotation refers to one feed in one rolling cycle of the rolling mill, and one rotation of about 57° at the front and rear dead centers.), two The Q value of roll rolling is 0.4-1.1, the Q value of three-roll rolling is 0.4-5, and the gap is 0.3-1.5mm. When rolling, the chlorinated paraffin is used as the inner wall lubricant, and the mixture of engine oil and paraffin is used as the outer wall lubricant (weight ratio 8-10:1). After rolling, the pipe is ultrasonically cleaned and degreased before heat treatment, and then pickled (HF: HNO 3 :H 2 O=5~12:45~60:100 (volume ratio) mixed solution, soak for 3~10min), wash and dry. After the 1st and 3rd passes of rolling, the inner surface is bored. After each rolling pass, ...

Embodiment 3

[0032] TC4 φ80×10mm is used to extrude the tube blank, and it is produced through LG90, LG60 two-roll cold rolling mill and LD60 three-roll cold rolling mill to produce φ40×1.2mm. The rolling method is single-feed and double-rotation (single-feed and double-rotation refers to one feed in one rolling cycle of the rolling mill, and one rotation of about 57° at the front and rear dead centers.), two The Q value of roll rolling is 0.5-0.9, the Q value of three-roll rolling is 0.8-3, and the gap is 0.2-1.2mm. When rolling, the chlorinated paraffin is used as the inner wall lubricant, and the mixture of engine oil and paraffin is used as the outer wall lubricant (weight ratio 8-10:1). After rolling, the pipe is ultrasonically cleaned and degreased before heat treatment, and then pickled (HF: HNO 3 :H 2 O=5~12:45~60:100 (volume ratio) mixed solution, soak for 3~10min), wash and dry. After the 1st and 2nd pass of rolling, the inner surface is bored. After each rolling pass, the he...

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Abstract

The invention relates to a method for rolling high-precision titanium alloy pipes. A prepared titanium alloy pipe billet is rolled in a combination way of two rollers and three rollers, and the rolling method adopts single feeding and double slew. The value Q of two-roller rolling is 0.4-2, the value Q of multiple-roller rolling is 0.4-9, and the amount of clearance is 0.2-2mm. The rolled finished pipe is processed in a way of outer surface grinding and inner surface honing to obtain the titanium alloy pipes, wherein the outer surface roughness Ra is less than or equal to 0.6 micrometers, the inner surface roughness Ra is less than or equal to 0.2 micrometers, the outside-diameter size tolerance is less than or equal to 0.04mm, the inside-diameter size tolerance is less than or equal to 0.03mm, and the wall-thickness size tolerance is less than or equal to 3 percent of a nominal wall thickness. Compared with the prior art, the method has the advantages that the size tolerance precision of the obtained products is relatively high, and the inside and outside surface quality is relatively good.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a rolling method of a high-precision titanium alloy pipe. Background technique [0002] With the in-depth development of my country's aerospace, petrochemical and nuclear power industries, the demand for high-precision, high-strength, corrosion-resistant, and high-temperature-resistant titanium alloy pipes is becoming more and more extensive. The requirements are also becoming more stringent. [0003] At present, the preparation methods of titanium alloy pipes are as follows: 1. Machining the billet before drilling; 2. Perforating the billet by extrusion or skew rolling, warm rolling or cold rolling after boring; 3. , Direct coil welding with plates. Among them, in the method of producing titanium alloy pipes by rolling, due to the characteristics of low elastic modulus, high specific strength, and large deformation resistance of titanium alloys, it is easy to crack duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21B45/02
Inventor 李永林朱宝辉蔡国帅孟鑫刘彦昌王培军
Owner 宁夏中色金航钛业有限公司
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