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Double-material powder-forging gear with gradient layer, and manufacturing method of double-material powder-forging gear

A dual-material, gradient layer technology, applied in the field of powder metallurgy, can solve the problems of interface cracking, mismatch, bending deformation interface and other problems of dual-material interface, and achieve the effects of good machinability, improved life, and increased strength

Active Publication Date: 2018-03-06
西安天歌之城材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, there is a large difference in the composition of the two sides of the gear, and there will be interface mismatch problems such as interface cracking and bending deformation on both sides of the dual-material interface. Therefore, it is urgent to provide a gear and a preparation method to solve these problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0029] Step 1. Ingredients:

[0030] (1) The mass percentage of the tooth material of the dual-material powder forged gear: copper 1.0%, graphite 0.5%, lubricant 0.5%, Ni 1.5%, Mo 0.5%, Mn 0.7%, Cr 3.5%, and the balance is iron . The mass percentage of the core material: copper 1.0%, graphite 0.5%, lubricant 0.5%, and the balance is iron. The particle size of the iron powder is below 200 mesh, and the oxygen content is 0.08wt.%. Each raw material is weighed according to the composition ratio of the core part and the gear part material of the gear, and mixed uniformly to obtain the core part material and the tooth part material.

[0031] (2) According to the composition of the first layer of the connecting gear tooth, that is, the tooth material with a mass fraction of 75% and the core material of 25%; the composition of the first layer of the connected gear core, that is, the tooth with a mass fraction of 25% Materials and 75% of the core material are batched separately, an...

specific Embodiment approach 2

[0040] Step 1 Ingredients:

[0041] (1) The mass percentage of the tooth material of the dual-material powder forged gear: copper 1.0%, graphite 0.5%, lubricant 0.5%, Ni2.0%, Mo 0.5%, Mn 0.6%, Cr 3%, and the balance is iron . The mass percentage of each component of the core material: copper 1.5%, graphite 0.5%, lubricant 0.5%, and the balance is iron. The particle size of the iron powder is below 200 mesh, and the oxygen content is 0.096wt.%. Each raw material is weighed according to the composition ratio of the internal gear material of the gear and mixed evenly to obtain the core material and the gear material.

[0042] (2) According to the composition of the tooth part of the connecting gear, that is, the tooth material with a mass fraction of 75% and the core material of 25%; the composition of the core part of the connected gear, that is, the tooth material with a mass fraction of 25% and 75% The core material of the core material is batched separately, and the prepar...

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Abstract

The invention belongs to the field of manufacturing of powder metallurgy automobile parts, and in particular relates to a double-material powder-forging gear with high performance and low cost, and amanufacturing method thereof. The gear structure comprises a gear tooth part, a gear core part and a middle gradient layer, wherein the gear tooth part is Fe-based alloy containing alloy elements suchas Ni, Cr and Mo and with high hardness and high wear resistance; and the gear core part is Fe-C-Cu alloy with low cost. The interface is provided with alloy powder consisting of two kinds of powderaccording to a specific ratio and the alloy powder is added according to the gradient layer design mode. Through design and powder forging forming of three parts of materials such as the tooth part, the gradient layer and the core part, the production cost of the gear is reduced, the performance of the gear is improved, and the problem that the interfaces are not matched, for example, the interfaces are cracked, bended and deformed, which is caused by the component difference between the two sides of the double-material powder-forging gear is great is solved through design of the gradient layer.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, is mainly aimed at products such as gears, and particularly provides a dual-material powder forged gear with good interface transition and a preparation method thereof. Background technique [0002] With the continuous development of the automobile industry, the powder metallurgy industry around the needs of the automobile industry has also developed rapidly. Powder metallurgy hot forging technology (referred to as "powder forging") is a processing technology formed by combining conventional powder metallurgy and high temperature forging. Powder forging can combine the manufacture of near-final or final shape parts with high mechanical properties of materials. Realize the combination of conventional powder metallurgy and forging process advantages. [0003] With the development of technology, powder metallurgy forming has been able to transport different powder raw material mixtures to different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/42C22C38/44C22C38/04B22F1/00B22F7/06B22F7/02B22F5/08B22F3/02B22F3/10B22F3/17
Inventor 张广明江峰王华磊
Owner 西安天歌之城材料科技有限公司
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