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Forming method and application of a thin-walled titanium alloy pipe with complex variable cross-section

A titanium alloy and variable cross-section technology, applied in the field of material processing, can solve problems such as uneven wall thickness distribution, cumbersome process control, and difficulty in mass production, and achieve reliable process technology assurance, high dimensional accuracy, and high dimensional accuracy. Effect

Inactive Publication Date: 2017-07-11
AEROSPACE HIWING HARBIN TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the forming methods for such pipe fittings are mainly through sheet metal deep drawing, laser butt welding process or superplastic forming process, but due to cumbersome process control, unstable forming quality, uneven wall thickness distribution, difficult cost control, and processing efficiency It is difficult to achieve mass production without the limitation of high factors

Method used

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  • Forming method and application of a thin-walled titanium alloy pipe with complex variable cross-section
  • Forming method and application of a thin-walled titanium alloy pipe with complex variable cross-section
  • Forming method and application of a thin-walled titanium alloy pipe with complex variable cross-section

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a method for superplastic inflatable forming of a thin-walled titanium alloy complex variable-section pipe. The specific steps are as follows:

[0045] 1) Weld a head with an air inlet channel at one end of the pipe;

[0046] 2) Spray solder resist on the parts where the die and punch are in contact with the pipe; place the pipe with the air intake channel in the cavity of the die, and close the molds;

[0047] 3) Introduce high-purity argon gas into the mold and pipe, vacuumize, and repeat 3 times to discharge the gas inside the mold and pipe;

[0048] 4) Heat to the superplastic forming process temperature (usually 950°C), keep it warm for 1 hour to ensure that the temperature of the mold and the pipe is uniform, and slowly introduce high-purity argon into the pipe through the air inlet channel to control the strain rate during the deformation of the pipe. 5×10 -4 / s, the forming time is about 3 hours, the pressure is unloaded, and the tempe...

Embodiment 2

[0054] This embodiment provides a method for forming a thin-walled titanium alloy pipe with complex variable cross-section, and the specific steps are as follows:

[0055] 1) Cut the titanium alloy plate according to the expanded size of the variable cross-section special-shaped pipe to obtain the special-shaped titanium plate. The wall thickness of the titanium plate used is 0.2mm, and the material is TC4 titanium alloy;

[0056] 2) Spray solder resist at the position where the die, mandrel, upper die, left and right dies are in contact with the pipe; the die is a cavity with the same shape as the outside of the complex variable cross-section pipe; The mold with the same inner shape of the cross-section pipe; the upper mold is a mold with the same curvature as the weld position of the complex variable cross-section pipe; the left and right molds are molds that form the outer shape of the complex variable cross-section pipe surrounded by the die.

[0057] 3) Place the special-...

Embodiment 3

[0063] This embodiment provides a method for forming a thin-walled titanium alloy pipe with complex variable cross-section, and the specific steps are as follows:

[0064] This embodiment provides a method for forming a thin-walled titanium alloy pipe with complex variable cross-section, and the specific steps are as follows:

[0065] 1) Cut the titanium alloy plate according to the expanded size of the variable cross-section special-shaped pipe to obtain the special-shaped titanium plate. The wall thickness of the titanium plate used is 0.5mm, and the material is Ti55 titanium alloy;

[0066] 2) Spray solder resist at the position where the die, mandrel, upper die, left and right dies are in contact with the pipe; the die is a cavity with the same shape as the outside of the complex variable cross-section pipe; The mold with the same inner shape of the cross-section pipe; the upper mold is a mold with the same curvature as the weld position of the complex variable cross-secti...

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Abstract

The invention relates to a forming method and application of a thin-walled titanium alloy pipe with complex variable cross-section and belongs to the technical field of material processing. Cut the titanium alloy plate according to the expanded size of the variable-section special-shaped pipe to obtain the special-shaped titanium plate, place the special-shaped titanium plate, die and upper die in the diffusion connection equipment, press the core die into the die completely after heating, and feed the left and right dies , close the plate into a special-shaped pipe, press down on the upper working platform, heat up to the temperature of the diffusion welding process, and then perform joint diffusion welding, cool down, and take the piece to obtain a thin-walled titanium alloy complex variable-section pipe. The invention can obtain high-quality titanium alloy variable-section pipes with very uniform wall thickness, high dimensional accuracy and almost invisible welding seams through only two processes and one heat cycle, and can realize mass production.

Description

technical field [0001] The invention relates to a forming method and application of a thin-walled titanium alloy pipe with complex variable cross-section and belongs to the technical field of material processing. Background technique [0002] Titanium alloy pipes are widely used in aviation, mechanization and chemical industry because of their high specific strength, wear resistance and corrosion resistance. [0003] With the development of various industries, the product forms are becoming more and more diversified, and the market demand for thin-walled titanium alloy pipes with special shapes and cross-sections is increasing day by day. Due to the poor plasticity of titanium alloy at room temperature and serious springback after forming, traditional pipe forming methods (such as RBE method, row-roll forming method, W reverse bending method, etc.) are difficult to apply in titanium alloy pipe forming. The vast majority of titanium alloy pipes sold are equal-diameter pipes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/15
Inventor 于传富许沂丁锐肖波任露
Owner AEROSPACE HIWING HARBIN TITANIUM IND
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