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High-performance automotive oil pump precision gear metallurgical powder and gear preparation method

A metallurgical powder, high-performance technology, applied in the field of powder metallurgy, can solve the problems of poor contact fatigue strength and tooth crush strength of gears

Inactive Publication Date: 2017-10-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the contact fatigue strength and tooth wear strength of gears produced by domestic powder metallurgy technology are not good. Because the gear strength cannot meet the process requirements, the gears of some precision mechanical parts are mainly imported to meet the demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] High toughness grade powder

[0029] The elements and content of the basic iron powder are: carbon 0.5-0.7wt%, copper 2-2.5wt%, iron balance. The mixed rare earth content is 0.1-0.3wt%, the 560°C high-temperature fluidized bed micro-oxygen mixed powder, and the sintering oxygen volume content is 0.5-1.0%. After the brand powder leaves the factory, the gear prepared by the supporting company using the conventional powder metallurgy forming process of the Fe-Cu-C brand (compression force 600MPa, sintering temperature 1120°C, reducing atmosphere) has higher toughness, and the impact toughness has increased by more than 5.7%. The chipping strength was increased by more than 2.1%.

Embodiment 2

[0031] High strength grade powder

[0032] The basic iron powder is the same as the implementation case 1, the mixed rare earth content is 0.8-1wt%, the micro-oxygen mixed powder in a fluidized bed at 700°C, and the sintered oxygen volume content is 3-4%. After the brand powder leaves the factory, the gears prepared by the supporting company using the conventional powder metallurgy forming process of the Fe-Cu-C brand (compressing force 600MPa, sintering temperature 1120°C, reducing atmosphere) have higher strength, especially the teeth. 9.3%, impact toughness increased by more than 1.0%.

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PUM

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Abstract

The invention relates to a metallurgical powder for precision gears of a high-performance automobile oil pump and a gear preparation method. The metallurgical powder is composed of the following components by weight percentage: basic powder: 99-99.9 wt%, mixed rare earth: 0.1-1.0 wt%. Compared with the prior art, the present invention utilizes the characteristics of easy oxidation of rare earths, and adopts the method of oxidation bridging to prepare branded powders. Compared with the method of direct alloy atomization, the initial hardness of the branded powders is lower and suitable for powder metallurgy process. In addition, using the high-temperature sintering process in the powder metallurgy process, the original rare earth surface oxide and particle surface oxide are used as precursors to finally form the required oxide reinforcement phase, and because the reinforcement phase is formed by diffusion reaction, they eventually It is dispersed in the matrix of the powder metallurgy parts, and finally makes the powder metallurgy parts have higher strength, and the unoxidized rare earth elements are alloyed with the matrix elements through sintering, which increases the toughness and strength of the matrix.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a high-performance automotive oil pump precision powder metallurgy gear and a preparation method thereof. Background technique [0002] Powder metallurgy technology is a new type of technology that perfectly combines material science and metal forming technology. It is widely used in various industries because of its high efficiency, non-cutting processing, material saving, energy saving, and environmental protection. [0003] The material composition of powder metallurgy structural parts is not limited by smelting. It can be added with alloy composition or other structural components, and can be adjusted according to the requirements in a considerable range, so that the mechanical properties can match the steel parts. Effect. [0004] Powder metallurgy has a high degree of mechanization, which can not only reduce personnel, but also improve efficiency, thereby saving ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C33/02B22F5/08B22F1/00
CPCC22C33/0228C22C33/0264C22C38/005C22C38/16B22F5/08B22F2999/00B22F1/145B22F2201/03
Inventor 严彪严鹏飞黄家声杨百元
Owner TONGJI UNIV