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Titanium alloy gear and preparation method thereof

A titanium alloy and gear technology, applied in the field of titanium alloy gear and its preparation, can solve the problems of limiting gear wear resistance, power density and service life, low surface hardness and fatigue strength, complicated heat treatment process, etc. Heat treatment process, difficult processing, light weight effect

Inactive Publication Date: 2019-02-01
HUZHOU MAILONG MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the gears prepared in the prior art can meet the requirements of use, the heat treatment process is complicated, and the deformation is large during the heat treatment process, and problems such as structural defects and uneven penetration are prone to occur, which affect its performance.
In addition, for gears with complex structures such as internal gears with large helix angles, herringbone gears without undercuts, and double gears, it is difficult to process them with gear hobbing or gear shaping
Moreover, the surface hardness and fatigue strength of conventional carburizing and nitriding gears are still low, which limits the further improvement of gear wear resistance, power density and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The raw materials used in the following examples of the present invention are commercially available, and the TC21 titanium alloy powder used is provided by AVIC Maite Powder Metallurgy Technology Co., Ltd., and the composition is: Ti-6Al-2Sn-2Zr-2Mo-2Cr-1Nb- 0.1Si; the particle size is 45-75μm.

[0039] 3D printing shapes:

[0040] Using the electron beam selective melting forming technology, the working power is 3000W, the scanning rate is 5300mm / s, and the spot diameter is 200

[0041] Under the conditions of 50μm and 50μm powder coating thickness, TC21 titanium alloy powder is printed to form the gear matrix. Compared with the final formed gear, the tooth thickness of the gear tooth has a thickness allowance of 1.6mm, which is used for subsequent laser cladding to form the surface hardened layer.

[0042] Hot isostatic pressing:

[0043] Put the above-mentioned 3D printed titanium alloy gear matrix into a hot isostatic pressing furnace at a heating temperature of...

Embodiment 2

[0049] 3D printing shapes:

[0050] Using the electron beam selective melting forming technology, the working power is 3000W, the scanning rate is 5300mm / s, and the spot diameter is 200

[0051] Under the conditions of 50μm and 50μm powder coating thickness, TC21 titanium alloy powder is printed to form the gear matrix. Compared with the final formed gear, the tooth thickness of the gear tooth has a thickness allowance of 1.6mm, which is used for subsequent laser cladding to form the surface hardened layer.

[0052] Hot isostatic pressing:

[0053] Put the above-mentioned 3D printed titanium alloy gear matrix into a hot isostatic pressing furnace at a heating temperature of 950 °C and a working pressure of

[0054] 120MPa, the holding time is 60min, and the gear body is obtained.

[0055] Laser cladding produces a hardfacing layer:

[0056] Spherical TiC powder, Ti powder and Ni powder are mixed in a ratio of 40:40:20, at a power of 2500W, a scanning speed of 2.5mm / s, a pr...

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Abstract

The invention discloses a titanium alloy gear. The titanium alloy gear comprises a titanium alloy gear substrate and a hardened layer adhering to the surface of the titanium alloy gear substrate. According to the titanium alloy gear, preferably, the titanium alloy gear substrate comprisesthe component of an alpha and beta phase titanium alloy. The titanium alloy gear substrate preferably comrpisesthe components including, by weight, 5.2%-6.8% of Al, 1.6%-2.5% of Sn, 1.6%-2.5% of Zr, 2.0%-3.3% of Mo, 0.9%-2.0% of Cr, 1.0%-2.0% of Nb, 0.05%-0.15% of Si and the balance Ti.

Description

technical field [0001] The invention relates to the technical field of gears, in particular to a titanium alloy gear and a preparation method thereof. Background technique [0002] Gear transmission is the most widely used transmission mechanism. With the development of modern industrial level, gear transmission is developing in two directions of low speed and heavy load and high speed and heavy load. The performance requirements of gears are getting higher and higher. It has the characteristics of high power density, long life and high reliability. [0003] The high-performance gears commonly used at present are generally made of low-carbon and medium-carbon alloy steel forgings, which are formed by hobbing or shaping, and then carburized and nitrided to obtain a surface hardened layer. Finally, the required gear design accuracy is achieved by grinding the teeth. . [0004] Although the gears prepared in the prior art can meet the requirements of use, the heat treatment p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00B22F3/105B22F3/15B22F5/08C23C24/10
CPCC22C14/00C23C24/103B22F3/15B22F5/08B22F10/00B22F10/66B22F10/25B22F10/64B22F10/28B22F10/36Y02P10/25
Inventor 邱峰
Owner HUZHOU MAILONG MACHINERY CO LTD