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Aviation titanium alloy 3D free bend warm forming device and forming method

A technology of warm forming and titanium alloy, applied in metal processing, transportation and packaging, metal processing equipment, etc., can solve the problem of inability to achieve bending radius, and achieve the effect of important engineering application value, high production efficiency and obvious economic benefits.

Active Publication Date: 2017-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects that the existing titanium alloy pipe bending forming technology cannot realize the continuous change of the bending radius, and at the same time, the pipe fittings are prone to cracking and wrinkling after forming, which cannot meet the requirements of aerospace for complex, high performance, high Defects in the requirements of aviation pipe fittings for dimensional accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the first step, the TC4 titanium alloy tube with a length of 250mm, a diameter of 20mm, and a wall thickness of 1mm is heated to 690°C in a heating furnace before forming a space bend;

[0029] The second step is to conduct a free bending test on the heated titanium alloy tube to obtain the bending radius R when the eccentricity is 1mm, 2mm, 3mm..., and draw the relationship curve between the eccentricity U and the bending radius R;

[0030] The third step is to analyze the process of the complex space elbow to be bent, and obtain the bending radius R to be bent 1 Eccentricity U at =65mm 1 =10mm and R 2 Eccentricity U at =80mm 2 = 8mm;

[0031] The fourth step, the U 1 =10mm, U 2 =8mm is substituted into the forming process analysis formula to obtain the forming process parameters for the complex space elbow to be bent;

[0032] The fifth step is to input the forming process parameters and the induction heating temperature of 690°C into the special control soft...

Embodiment 2

[0036] In the first step, the TC4 titanium alloy tube with a length of 150mm, a diameter of 15mm, and a wall thickness of 1mm is heated to 680°C in a heating furnace before forming a space bend;

[0037] The second step is to conduct a free bending test on the heated titanium alloy tube to obtain the bending radius R when the eccentricity is 1mm, 2mm, 3mm..., and draw the relationship curve between the eccentricity U and the bending radius R;

[0038] The third step is to analyze the process of the complex space elbow to be bent, and obtain the bending radius R to be bent 1 =Corresponding eccentricity U when 70mm 1 = 6mm, R 2 =Corresponding eccentricity U when 80mm 2 =5mm, R 3 Eccentricity U when =75mm 3 =6.4mm;

[0039] The fourth step, the U 1 = 6mm, U 2 =5mm, U 3 =6.4mm is substituted into the forming process analysis formula to obtain the forming process parameters for the complex space elbow to be bent;

[0040] The fifth step is to input the forming process para...

Embodiment 3

[0044] In the first step, the TC4 titanium alloy tube with a length of 300 mm, a diameter of 20 mm, and a wall thickness of 2 mm is heated to 700 ° C in a heating furnace before forming a space bend;

[0045]The second step is to conduct a free bending test on the heated titanium alloy tube to obtain the bending radius R when the eccentricity is 1mm, 2mm, 3mm..., and draw the relationship curve between the eccentricity U and the bending radius R;

[0046] The third step is to analyze the process of the complex space elbow to be bent, and obtain the bending radius R to be bent 1 =Corresponding eccentricity U when 80mm 1 = 8mm, R 2 =Corresponding eccentricity U when 90mm 2 = 7mm, R 3 Eccentricity U when =90mm 3 =6mm;

[0047] The fourth step, the U 1 =8mm, U 2 =7mm, U 3 =6mm is substituted into the forming process analysis formula to obtain the forming process parameters for the complex space elbow to be bent;

[0048] The fifth step is to input the forming process para...

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Abstract

The invention discloses an aviation titanium alloy 3D free bend warm forming device and a forming method. The forming method comprises the following steps: (1) the free bend forming test is performed for an aviation titanium alloy pipe heated to a specific temperature before bending of a pipe in forming space to obtain a relation curve between an eccentric distance U of the pipe at the specific temperature and a bending radius R; when the titanium alloy bent pipe is technologically analyzed, the eccentric distance Un is firstly obtained from the curve when the bending radius is Rn; and then, Un is substituted into a three-dimensional free bend forming analysis formula to obtain forming process parameters aiming at the complex bent pipe; and (2) in the forming process, an infrared temperature measurer measures the surface temperature of the pipe in real time; and the real-time feedback adjustment is performed for the feeding speed of the pipe along a Z axle to guarantee stable heating temperature of the pipe. As the local induction heating is performed for the titanium alloy pipe, the forming method can preferably eliminate such defects as low plasticity, high deformation resistance and difficult bending formation in the cold bend forming process of the titanium alloy pipe, and improves the forming quality of the aviation titanium alloy bent pipe.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of complex metal components, and in particular relates to a 3D free-bending warm-forming device and method for aerospace titanium alloys. Background technique [0002] Titanium alloy pipes are widely used in important engineering fields such as aerospace because of their high strength, good corrosion resistance, and high heat resistance. Its main uses include: making aircraft engine compressor parts, aircraft bleed air pipelines, hydraulic pipelines, fuel pipelines, structural parts of rockets and missiles, pipelines for material circulation between various titanium equipment, etc. [0003] Titanium alloy pipe bending is a complex pipe forming technology. The quality of pipe forming is affected by many factors such as the performance of the pipe itself, the wall thickness of the pipe, the bending process, and the level of mold design and manufacturing. At present, the bending formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D7/08B21D7/12B21D7/16B21C51/00B21D53/92
CPCB21C51/00B21D7/085B21D7/12B21D7/162B21D53/92
Inventor 陶杰郭训忠万柏方马燕楠熊昊靳凯李洪东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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