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A near-isothermal precision forging method for titanium alloy forgings

A precision forging and titanium alloy technology, applied in the field of warm precision forging, can solve the problems of high manufacturing cost, expensive mold materials, high-temperature alloy mold materials, etc., and achieve the effect of reducing production costs

Active Publication Date: 2020-12-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the isothermal forming temperature of titanium alloys is usually as high as 900°C or higher. Its isothermal precision forming usually requires the use of TZM alloy molds under vacuum or inert gas, or high-temperature alloy molds such as K403 under atmospheric conditions. The mold materials are expensive and the manufacturing cost is high.
[0003] Titanium alloy near-isothermal forging technology is an advanced forging technology developed on the basis of isothermal forging technology. It heats the mold temperature to 30-80°C lower than the workpiece temperature, and uses a certain strain rate for forging, but the mold still needs to use 800 ℃ high-temperature molds cannot fundamentally solve the problem of expensive high-temperature alloy mold materials and high manufacturing costs

Method used

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  • A near-isothermal precision forging method for titanium alloy forgings
  • A near-isothermal precision forging method for titanium alloy forgings
  • A near-isothermal precision forging method for titanium alloy forgings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The TC4 titanium alloy bar is preheated to 980°C, and the TC4 titanium alloy billet is made by free forging and pressing, so that the TC4 titanium alloy billet can cover the cross section of the corner box mold;

[0052] Heating the TC4 titanium alloy billet to 960°C to obtain a preheated billet; preheating the corner box mold to 500°C to obtain a preheated corner box mold, which is made of H13 hot die steel;

[0053] Use the preheated corner box mold to carry out the first die forging on the preheated billet. During the first die forging process, the temperature of the corner box mold is kept above 400°C. When the temperature of the forging is lower than 900°C, the die forging is stopped, and the steam hammer The pressing speed is 4m / s, and the first pre-forging is obtained, and the degree of deformation is 60%.

[0054] Heating the first pre-forging to 980°C to obtain a preheated forging; preheating the corner box mold to 500°C to obtain a preheated corner box mold; ...

Embodiment 2

[0060] The TA15 titanium alloy bar is preheated to 970°C, and the TA15 titanium alloy billet is made by free forging and pressing, so that the TA15 titanium alloy billet can cover the cross section of the corner box mold;

[0061] Heating the TA15 titanium alloy billet to 960°C to obtain a preheated billet; preheating the corner box mold to 500°C to obtain a preheated corner box mold, which is made of 5CrNiMo hot die steel;

[0062] The preheated corner box mold is used for the first forging of the preheated billet. During the first forging process, the temperature of the corner box mold is kept above 400°C, and the pressing speed of the electro-hydraulic hammer is 7m / s. When the temperature of the forging is When the temperature is lower than 900°C, die forging is stopped to obtain the first pre-forging with a deformation degree of 40%;

[0063] Heating the first pre-forging to 960°C to obtain a preheated forging; preheating the corner box mold to 500°C to obtain a preheated ...

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Abstract

The invention belongs to the technical field of titanium alloy forming, and particularly relates to a near-isothermal precision forging method of titanium alloy forgings. According to the near-isothermal precision forging method, a multi-heating die forging mode is adopted, expensive dies resistant to high temperatures of 900 DEG C are not needed, a die can achieve near-isothermal precision forging of the titanium alloy forgings under low preheating temperatures, and therefore the production cost is greatly lowered.

Description

technical field [0001] The invention relates to the technical field of titanium alloy forming, in particular to a nearly isothermal precision forging method for a titanium alloy forging. Background technique [0002] Titanium alloys are widely used in the aerospace field due to their high strength, low density and good heat and corrosion resistance. In order to ensure the accuracy, strength and performance consistency of titanium alloy forgings, the use of precision die forging technology for manufacturing has technological advantages. Due to the high strength and high deformation resistance of titanium alloys, and the microstructure and properties are sensitive to process parameters, isothermal precision forming is the preferred forming technology in order to improve its forming accuracy. However, the isothermal forming temperature of titanium alloys is usually as high as 900°C or higher. The isothermal precision forming usually requires the use of TZM alloy molds under va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J1/06B21K29/00
CPCB21J1/06B21J5/02B21K29/00
Inventor 徐文臣单德彬杨川宗影影陈宇
Owner HARBIN INST OF TECH
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