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

Active Publication Date: 2018-04-10
SEED TECH CORP 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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  • Titanium alloy gear and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 3D printing shape:

[0041] Using electron beam selective melting forming technology, under the conditions of working power 3000W, scanning speed 5300mm / s, spot diameter 200μm, and powder coating thickness 50μm, the TC21 titanium alloy powder was printed to form a gear matrix. Compared with the final formed gear, the gear matrix A thickness allowance of 1.6mm is reserved for the tooth thickness, which is used for subsequent laser cladding to form a surface hardened layer.

[0042] Hot isostatic pressing:

[0043] Put the above 3D printed titanium alloy gear base into a hot isostatic pressing furnace with a heating temperature of 950°C, a working pressure of 120 MPa, and a holding time of 60 minutes to obtain a gear body.

[0044] Laser cladding produces a hardfacing layer:

[0045] Spherical TiC powder, Ti powder and Ni powder are mixed in a ratio of 40:40:20, at a power of 2000W, a scanning speed of 3.5mm / s, a shielding gas flow rate of 2.5L / min, a beam diameter of 3...

Embodiment 2

[0049] 3D printing shape:

[0050] Using electron beam selective melting forming technology, under the conditions of working power 3000W, scanning speed 5300mm / s, spot diameter 200μm, and powder coating thickness 50μm, the TC21 titanium alloy powder was printed to form a gear matrix. Compared with the final formed gear, the gear matrix A thickness allowance of 1.6mm is reserved for the tooth thickness, which is used for subsequent laser cladding to form a surface hardened layer.

[0051] Hot isostatic pressing:

[0052] Put the above 3D printed titanium alloy gear base into a hot isostatic pressing furnace with a heating temperature of 950°C, a working pressure of 120 MPa, and a holding time of 60 minutes to obtain a gear body.

[0053] Laser cladding produces a hardfacing layer:

[0054] 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 shielding gas flow rate of 2.5L / min, a beam diameter of 2...

Embodiment 3

[0058] Test the performance of the titanium alloy gear prepared by the embodiment of the present invention 1 and embodiment 2, the specific test method is:

[0059] The surface hardness is tested according to GB / T4340.1-2009 "Vickers Hardness Test of Metallic Materials Part 1: Test Method".

[0060] The wear performance is tested according to the standard GB / T 12444-2006 "Metallic Material Wear Test Method Test Ring-Test Block Sliding Wear Test".

[0061] The contact fatigue performance is tested according to the standard GB / T 14229-93 "Test Method for Gear Contact Fatigue Strength".

[0062] The test results are shown in Table 1, and Table 1 shows the performance test results of the titanium alloy gears prepared in Example 1 and Example 2 of the present invention.

[0063] Table 1 The performance testing results of the titanium alloy gears prepared in Example 1 and Example 2 of the present invention

[0064]

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Abstract

The invention provides a preparation method for a titanium alloy gear. The preparation method includes the steps that a titanium alloy gear substrate is prepared through a 3D printing method; the titanium alloy gear substrate is subjected to hot isostatic pressing treatment, and a titanium alloy gear blank is obtained; a hardened layer is formed on the surface of the titanium alloy gear blank through a fusion covering method, and the titanium alloy gear is obtained; and the thickness of the hardened layer is 1-2 mm. According to the preparation method for the titanium alloy gear, the mechanical properties of the gear substrate are improved through hot isostatic pressing treatment, and the thick hardened layer can be formed on the surface of the gear substrate through the fusion covering method. The titanium alloy gear prepared through the process is high in surface hardness, low in friction coefficient, resistant to abrasion, high in impact resistance and fatigue performance, and suitable for gear transmission equipment in the aerospace industry, automobile industry and the like.

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): C23C24/10B22F3/105B22F3/15B22F5/08C22C14/00B33Y80/00F16H55/17F16H55/06B22F3/24
CPCF16H55/06F16H55/17C22C14/00C23C24/103B22F3/15B22F3/24B22F5/08B33Y80/00B22F2998/10B22F2003/242B22F10/00B22F10/66B22F10/25B22F10/36B22F10/38B22F10/28B22F10/64Y02P10/25
Inventor 徐跃华熊顺
Owner SEED TECH CORP LTD
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