Forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy

A processing method and technology of titanium alloys, applied in metal processing equipment, manufacturing tools, forging/pressing/hammer devices, etc., can solve the problems of uneven structure and properties, difficult deformation of titanium alloys, long process flow, etc., and achieve fixed assets. The effect of lower depreciation, shorter production cycle and shorter process flow

Inactive Publication Date: 2014-10-01
宁夏中色金航钛业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Generally speaking, titanium alloy is a difficult-to-deform and difficult-to-machine material, especially the TC4 large-scale bar used in aerospace structural parts, which has the problem of uneven structure and performance
In order to solve this problem, larger size ingots (such as Φ700~Φ950mm 4 ton to 8 ton ingots), large forging presses (2500 ton to 3150 ton fast forging machines) and increased forging fire times (8 ~13 fire times) and other measures to achieve, but the investment cost is high, the process is long, and the technology is complicated

Method used

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  • Forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy
  • Forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy
  • Forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy

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Embodiment 1

[0038] In this embodiment, a 1600-ton fast forging machine is used to process TC4 titanium alloy rods with a diameter of 600 mm (the ingot is a cylinder and a length of 1200 mm) as raw materials to process TC4 titanium alloy rods of Φ215 mm×3000 mm. The processing method is as follows:

[0039] Step 1: Preheat a TC4 titanium alloy ingot with a diameter of 600mm at 820°C for 1 hour, then heat it at 1150°C for 4 hours, and use a 1,600-ton fast forging machine for billet forging. The ratio is 1.7, the total forging ratio is 2.8, the final forging temperature is 900°C, after forging, chop and cut into thirds, and then use water cooling;

[0040] Step 2: Preheat the billet forged in step 1 at 820°C for 1 hour, then heat and hold it at 1050°C for 3 hours, use a 1600-ton fast forging machine to start forging above the phase transition point, upsetting times 2 times, each upsetting ratio 1.7, the total forging ratio is 2.8, the full anvil is used for feeding when drawing, the final fo...

Embodiment 2

[0045] In this embodiment, a 1,600-ton fast forging machine is used to process a TC4 titanium alloy bar with a diameter of 600mm×780mm as a raw material to process a TC4 titanium alloy bar with a diameter of 600mm×780mm. The processing method is as follows:

[0046] Step 1: Preheat a TC4 titanium alloy ingot with a diameter of about 600mm at 820°C for 2 hours, then heat and hold at 1170°C for 6 hours, use a 1600-ton fast forging machine for blank forging, upsetting times 3 times, each upsetting The drawing and forging ratio is about 1.7, the total forging ratio is about 4.6, the final forging temperature is 900°C, and water cooling is used after forging;

[0047] Step 2: Preheat the billet forged in step 1 at 820°C for 2 hours, then heat and hold at 1050°C for 4 hours, use a 1600-ton fast forging machine for forging, upsetting and drawing times are 3 times, and the upsetting and drawing ratio of the first two times is about 1.7. The third drawing length forging ratio is about ...

Embodiment 3

[0052] In this embodiment, a TC4 titanium alloy ingot with a diameter of 600 mm is used as a raw material to process a TC4 titanium alloy rod with a diameter of Φ300 mm×2000 mm. The processing method is as follows:

[0053] Step 1: Preheat a TC4 titanium alloy ingot with a diameter of about 600mm×1100mm at 820°C for 1 hour, then heat and hold it at 1170°C for 5 hours, and use a 1600-ton fast forging machine for billet forging. Upsetting times are 3 times, each The first upsetting and drawing ratio is about 1.7, the total forging ratio is about 4.6, the final forging temperature is 900°C, and water cooling is used after forging;

[0054] Step 2: Preheat the blank forged in step 1 at 820°C for 1 hour, then heat and hold at 1100°C for 4 hours, use a 1600-ton fast forging machine for intermediate forging above the phase transition point, upsetting times 4 times, each upsetting ratio Not about 1.7, the total forging ratio is about 7.8, the full anvil is used to feed when drawing, t...

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Abstract

The invention relates to bar material forging machining method of titanium alloy, particularly to a forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy. The forging machining method is characterized by comprising the following steps of step 1, performing cogging forging, step 2, performing intermediate forging above a phase transformation point, step 3, performing intermediate forging below the phase transformation point, step 4 and step 5, performing finished product forging and obtaining the phi 200 to 300 mm and 2000 to 3000 mm length of large-sized bar materials of the TC4 titanium alloy finally. Compared with the prior art, a large-sized ingot casting and a large-tonnage forging device are not required and the industrialized production can be achieved through an ordinary industrial 3 ton ingot and a small-tonnage forging press and the equipment investment is small, only a 3 tons of electric arc furnace and a 3000 tons of forming oil press which is matched with the electric arc furnace need to be invested in the phi 600 of 3 ton ingot, the small-tonnage forging press such as a 1600 tons of forging press needs to be invested in the forging process, and accordingly the equipment investment is significantly reduced.

Description

technical field [0001] The invention relates to a forging processing method of a titanium alloy rod, in particular to a forging processing method of a TC4 titanium alloy large-size rod. Background technique [0002] Titanium alloy has the advantages of light weight, high specific strength, excellent high temperature performance, and strong corrosion resistance. It is an important material used in aviation, aerospace, weapons, ships and other fields. The aerospace industry is the main field of high-end application of titanium alloys, and the alloy grade with the largest amount of titanium alloys is TC4 (Ti-6Al-4V) medium-strength two-phase titanium alloy, accounting for about 70% of the output of titanium alloys, mainly used in aircraft structures parts etc. With the development of the aviation industry, in order to improve the safety and reliability of the aircraft, prolong the service life, and improve the structural efficiency, the design and development trend of the airc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J13/06
Inventor 薛长荣朱宝辉胡晓晨刘彦昌马超沈立华王益王莉赵玉林
Owner 宁夏中色金航钛业有限公司
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