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Processing method of high-strength titanium alloy thin-walled tube stock

A technology of thin-walled pipes and processing methods, which is applied in the field of material processing and high-strength titanium alloy pipe processing technology, can solve problems such as difficult to achieve, poor overall performance, difficult to match strength and plasticity, etc., to improve quality and finished products rate, high strength and plasticity, and good performance

Inactive Publication Date: 2010-05-12
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is prepared by the traditional hot extrusion method, it is difficult to realize because there is no ideal lubrication method so far, and the quality of the extruded pipe is even more difficult to guarantee; if it is prepared by the cross-rolling piercing + cold-rolling process, because the cross-rolling piercing process is easier Surface defects are formed, so the surface quality of the prepared pipes is difficult to guarantee. At the same time, this method is suitable for forming pipes with medium wall thickness, but not suitable for thin-walled pipes.
The general practice is to use forged rods to drill deep holes. This method causes a lot of waste of materials, the utilization rate of materials is extremely low, and it is difficult to achieve a good match between strength and plasticity.
In addition, the method of coil welding of titanium plate can also be adopted when the quality requirements of the pipe are not high, but the disadvantage of this process is that the welding point belongs to the casting structure, the performance of the material is very low, and the overall performance is very poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] TB8 titanium alloy is used to process a pipe with an inner diameter of 50mm and a wall thickness of 2mm. The pipe is processed by forging and spinning. The specific operation steps are as follows:

[0022] 1) The TB8 titanium alloy vacuum secondary melting ingot with a diameter of 380mm is subjected to billet forging at 1100°C, and forged into a bar with a cross-section of Φ120mm, then the bar is heated to 920°C, kept for 50 minutes, and then placed on a press A titanium alloy forged bar with a cross-section of Φ65mm is hot-forged, and the forging deformation is 71%;

[0023] 2) Polish the titanium alloy forging rod, drill holes, and the diameter of the inner hole is 50 mm to obtain a tube blank;

[0024] 3) Preheat the spinning mandrel before hot spinning, and the preheating temperature should be 400°C; keep the tube blank at 700°C for 40 minutes, and perform 4 passes of hot spinning, and the deformation of each pass Vacuum annealing is carried out every time spinning...

Embodiment 2

[0027] TB2 titanium alloy is used to process a pipe with an inner diameter of 100mm and a wall thickness of 1mm. The pipe is processed by forging and spinning. The specific operation steps are as follows:

[0028] 1) The TB2 titanium alloy vacuum secondary melting ingot with a diameter of 380mm is subjected to billet forging at 1200°C, and forged into a bar with a cross-section of Φ260mm, then the bar is heated to 900°C, kept for 30 minutes, and then placed on a press A titanium alloy forging bar with a cross-section of Φ120mm is hot-forged, and the forging deformation is 79%;

[0029] 2) Polish the titanium alloy forging rod, drill holes, and the diameter of the inner hole is 100 mm to obtain a tube blank;

[0030] 3) Preheat the spinning mandrel before hot spinning, and the preheating temperature is 400°C; keep the tube blank at 750°C for 30 minutes, and perform 4 passes of hot spinning processing, and the deformation of each pass is 40%, vacuum annealing is carried out eve...

Embodiment 3

[0033] TB2 titanium alloy is used to process a pipe with an inner diameter of 60mm and a wall thickness of 5mm. The pipe is processed by forging and spinning. The specific operation steps are as follows:

[0034] 1) The TB2 titanium alloy vacuum secondary melting ingot with a diameter of 380mm is subjected to billet forging at 1150°C, and forged into a bar with a cross-section of Φ260mm, then the bar is heated to 950°C, kept for 40 minutes, and then placed on a press A titanium alloy forging bar with a cross-section of Φ120mm is hot-forged, and the forging deformation is 80%;

[0035] 2) Polish the titanium alloy forging rod, drill holes, and the diameter of the inner hole is 60 mm to obtain a tube blank;

[0036] 3) Preheat the spinning mandrel before hot spinning, and the preheating temperature is 350°C; keep the tube blank at 720°C for 35 minutes, and perform 3 passes of hot spinning, and the deformation of each pass is 35%, vacuum annealing is carried out every time spinn...

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Abstract

The invention relates to a processing method of high-strength titanium alloy thin-walled tube stock, belonging to the field of material processing. The processing method comprises the following steps: 1) ingot casting titanium alloy at the temperature of 1100-1200 DEG C, cogging and forging, heating obtained bar stock to the temperature of 900-950 DEG C, conducting heat preservation for 30-50 minutes, and one-time hot-rolling on a rapid forging press to obtain titanium alloy forged bars; 2) finishing and drilling the titanium alloy forged bars to obtain tube blank; 3) preheating a central spindle to be spinned before hot spinning, with the preheating temperature not lower than the temperature of 350 DEG C; and conducting heat preservation on the tube blank at the temperature of 700-750 DEG C for 30-40 minutes, and multichannel hot spinning process; and 4) finishing the interior and exterior of the obtained hot spinned tube blank, and cold spinning and forming on a cold spinning machine to obtain finished products of the tube blank. The processing method adopts rapid forging blank making and spinning process for processing the titanium alloy thin-walled tube stock with higher requirements for room temperature strength and deformation resistance, has simple processing equipment and easy molding, and can effectively improve the quality and yield of alloy tube blank.

Description

technical field [0001] The invention relates to a processing method for high-strength titanium alloy thin-walled pipes, which belongs to the field of material processing, in particular to the field of processing technology for high-strength titanium alloy pipes. Background technique [0002] High-strength titanium alloy has high high-temperature strength and deformation resistance, and it is quite technically difficult to manufacture high-strength titanium alloy thin-walled pipes. If it is prepared by the traditional hot extrusion method, it is difficult to realize because there is no ideal lubrication method so far, and the quality of the extruded pipe is even more difficult to guarantee; if it is prepared by the cross-rolling piercing + cold-rolling process, because the cross-rolling piercing process is easier Surface defects are formed, so the surface quality of the prepared pipes is difficult to guarantee. At the same time, this method is suitable for the formation of me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21J1/04B21D22/16
Inventor 贺金宇李德富范荣辉
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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