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Method for producing surface-densified powder metallurgic gear

A powder metallurgy and production method technology, applied in the field of powder metallurgy surface dense gear production, can solve the problems of uneven density of the gear surface, the influence of elastic-plastic deformation, and the inability to control the elastic-plastic deformation of the gear well, so as to achieve gear tooth resistance The effect of improving fatigue resistance and wear resistance, improving performance and quality, and shortening the research and development cycle

Inactive Publication Date: 2013-05-01
SHANDONG XINYI POWDER METALLURGY CO LTD +1
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  • Application Information

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Problems solved by technology

[0024] (1) The elastic-plastic deformation of the gear cannot be well controlled in the existing production method, and the amount of elastic-plastic deformation is affected by many factors at the same position;
[0025] (2) The gear surface is dense and uneven in the existing production method;
[0026] (3) In the existing production method, it is easy to produce an unexpected stress field when dense;

Method used

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  • Method for producing surface-densified powder metallurgic gear
  • Method for producing surface-densified powder metallurgic gear
  • Method for producing surface-densified powder metallurgic gear

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Embodiment Construction

[0050] Combine below Figure 5 to Figure 9 , the present invention is further described:

[0051] as attached Figure 5 As shown, the powder metallurgy surface dense gear production process flow of the patent of the present invention is as follows:

[0052] Step 10, mixing ingredients.

[0053] The purpose of mixing is to make the components of the powder mixture and between the powder and the lubricant evenly mixed to achieve the maximum bulk density.

[0054] Step 20, powder pressing.

[0055] Powder compaction is also called powder forming. The purpose is to compress the loose powder into a preform (also known as a green body) with a certain strength and a geometric shape close to the final product.

[0056] In order to form the green body, the mold needs to be filled with powder 2.0-2.5 times the height of the gear. For example, a 10mm high spur gear needs to be filled with 20-25mm high powder for pressing.

[0057] Step 30, sintering.

[0058] The early stage of si...

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Abstract

The invention relates to a method for producing a surface-densified powder metallurgic gear. The method comprises the following steps of material mixing, powder pressing, sintering, peening, shaping, heat treatment and quality inspection. The gear processed by the method has the advantages that the surface porosity is avoided, the densification degree of the surface can be easily controlled, the number of adjusting times is reduced, the size precision is high, the fatigue-resistance and abrasion-resistance capabilities are improved, the defective rate is greatly reduced, the production cost is reduced, and meanwhile, the performance and the quality are improved.

Description

technical field [0001] The invention relates to a powder metallurgy surface dense gear production method. Background technique [0002] Gears are wheel-shaped mechanical parts that transmit torque reliably and without noise by the meshing of teeth. Through transmission with other toothed mechanical parts (such as another gear, rack, worm, and chain), the gear can realize functions such as changing the speed and torque, changing the direction of motion, and changing the form of motion. It is mainly required to have high strength and wear resistance on its surface or surface layer. For example, during the operation of the gear, there is a large amount of rolling contact between the tooth surface of the driving wheel and the driven wheel, and sometimes a certain amount of sliding wear is added. . In addition to the need for strength, low noise is also a must for many gear applications. The generation of noise basically depends on the dimensional tolerance, shape and surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/08B22F1/00B22F3/16B22F3/24C22C38/12
Inventor 刘福平
Owner SHANDONG XINYI POWDER METALLURGY CO LTD
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