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Machining method of titanium alloy large-diameter seamless thin-wall pipe

A technology of thin-walled pipes and processing methods, which is applied in the field of material processing, can solve problems such as the unformed production process system, low material utilization rate, and long processing cycle, and achieve flexible production methods, high material utilization rate, and good surface quality Effect

Active Publication Date: 2018-02-02
BAOJI TITANIUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For example, patent CN1038944441 discloses the production of titanium alloy pipes by forging pipe, but its outer diameter is only Φ90~Φ150mm, and the wall thickness is relatively thick, reaching 10~30mm; patents CN101972794 and CN105568195 disclose the use of "forging-forging rod drilling -Cold rolling” process route, processing through holes on the forged bar to turn the titanium material at the center of the bar into chips, and not taking it out completely, the material utilization rate is low, and the traditional cold rolling method is still used in the follow-up, The processing cycle is long; patents CN104831120, CN101190444 and CN104174807 disclose the production of titanium alloy large-diameter pipes by traditional extrusion + rolling; patent CN106425317 discloses the preparation of large-diameter Ti-B19 titanium alloy pipes with a wall thickness greater than 100mm; patent CN106493187 discloses the preparation of titanium alloy pipes with a maximum diameter of 520mm, but it adopts the method of forging billet + skew rolling piercing + drawing and reaming + machining; patent CN105665468 discloses the method of spinning + rolling, The outer diameter of the prepared titanium pipe is only 50-120mm, and the wall thickness is 0.5-1.5mm; the patent CN101704035 discloses the processing method of rapid forging billet + spinning, and the outer diameter of the titanium pipe is only 50-100mm, and the wall thickness is 1-5mm ;
[0007] At present, most of the titanium alloy pipes produced by my country's titanium processing enterprises have an outer diameter of less than 114mm. For large-diameter pipes with a diameter of more than 120mm, the processed pipes are basically thick-walled pipes. For large-diameter thin-walled pipes, reliable production process system

Method used

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  • Machining method of titanium alloy large-diameter seamless thin-wall pipe
  • Machining method of titanium alloy large-diameter seamless thin-wall pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Preparation of TA10 titanium alloy Φ133×6mm (diameter×wall thickness) pipe:

[0038] Step 1: TA10 titanium alloy Φ720mm ingot was prepared by smelting twice in a vacuum consumable electric arc furnace, and the phase transition point of the ingot was measured as 885-895°C by quenching metallographic method;

[0039] Step 2: After planing and milling the ingot, the surface is coated with an anti-oxidation protective coating, heated and kept in a natural gas furnace (temperature control accuracy ±15°C) and then released from the furnace, and then forged on a 10,000-ton fast forging machine to Φ220× 1200mm billet, specifically forging 2 to 3 times in the single-phase zone and 2 to 3 times in the (α+β) two-phase zone, where the heating temperature in the single-phase zone is 950-1000°C, 820~880℃;

[0040] Step 3, using a cutter to take out a Φ90mm solid bar from the center of the Φ220mm bar blank to obtain a Ф220 / Ф140×1200mm hollow capillary;

[0041] Step 4, heat the hollo...

Embodiment 2

[0046] Preparation of TA10 titanium alloy Φ159×7mm (diameter×wall thickness) pipe:

[0047] Step 1: TA10 titanium alloy Φ720mm ingot was prepared by smelting twice in a vacuum consumable electric arc furnace, and the phase transition point of the ingot was measured as 885-895°C by quenching metallographic method;

[0048] Step 2: After planing and milling the ingot, the surface is coated with an anti-oxidation protective coating, heated and kept warm in a natural gas furnace, and then released from the furnace, and then forged on a 10,000-ton fast forging machine to form a billet of Φ250×1200mm. 2-3 times of forging in the single-phase area, 2-3 times of forging in the (α+β) two-phase area, wherein the heating temperature of the single-phase area is 950-1000 °C, and the heating temperature of the two-phase area is 820-880 °C;

[0049] Step 3, taking out the solid bar of Φ115mm from the center of the bar blank through mechanical processing to obtain a hollow capillary of Ф250 / Ф...

Embodiment 3

[0055] Preparation of TA10 titanium alloy Φ190×8mm (diameter×wall thickness) pipe:

[0056] Step 1: TA10 titanium alloy Φ720mm ingot was prepared by smelting twice in a vacuum consumable electric arc furnace, and the phase transition point of the ingot was measured as 885-895°C by quenching metallographic method;

[0057] Step 2: After planing and milling the ingot, the surface is coated with an anti-oxidation protective coating, heated and kept warm in a natural gas furnace, and then released from the furnace, and then forged on a 10,000-ton fast forging machine to form a billet of Φ268×1200mm. 2-3 times of forging in the single-phase area, 2-3 times of forging in the (α+β) two-phase area, wherein the heating temperature of the single-phase area is 950-1000 °C, and the heating temperature of the two-phase area is 820-880 °C;

[0058] Step 3, take out the solid bar material of Φ130mm from the center of the bar blank through mechanical processing to obtain the hollow capillary ...

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Abstract

The invention discloses a machining method of a titanium alloy large-diameter seamless thin-wall pipe. The machining method comprises the steps that a titanium alloy casting ingot is heated and subject to heat preservation, blooming forging to form a bar billet is achieved, the bar billet is machined to obtain a hollow tubular billet, the hollow tubular billet is heated and subject to radial forging, a tube billet is obtained, and after annealing, turning is carried out to obtain a titanium alloy pipe with the outer diameter being phi 133 mm to phi 219 mm, the wall thickness ranging from 6 mmto 8.5 mm and the length larger than 3000 mm. According to the method, the titanium alloy casting ingot is machined into the pipe with the diameter larger than 120 mm and the wall thickness ranging from 6 mm to 8.5 mm, the pipe room temperature mechanical property is good, and compared with a traditional extrusion rolling machining method, the method is simple and short in flow, the obtained pipeis good in surface quality, high in size precision, and uniform in wall thickness. The method is low in production cost, the obtained titanium alloy pipe can be used for fields of ships, petroleum, chemical engineering, ocean engineering and the like, and the machining blank of the domestic titanium alloy large-diameter seamless thin-wall pipe is filled up.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a processing method for large-diameter titanium alloy seamless thin-wall pipes. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength, corrosion resistance, and non-magnetic properties. It has broad application prospects in the fields of aviation, aerospace, chemical industry, weapons, ships, automobiles, construction, and medical treatment. It is known as the metal of the 21st century. Material, has the reputation of "space metal", "ocean metal" and "third metal". Therefore, TA16, TA18, TA10, TC4 and other titanium alloys are processed into pipes of various specifications, which are used in aviation, chemical industry, ships and other fields. [0003] Due to the characteristics of high strength, high deformation resistance, difficult deformation, and extremely difficult processing and forming of titanium a...

Claims

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Application Information

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IPC IPC(8): B21C37/06C22F1/18C21D9/08
CPCB21C37/06C21D9/08C22F1/183
Inventor 冯秋元岳旭张伟毛玲玲代春成小丽张永强徐哲赵彤羊玉兰胡志杰何书林李献民贾栓孝
Owner BAOJI TITANIUM IND
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