Heat treatment process for mining cone bit friction pair

A technology of roller cone bits and friction pairs, which is applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as the difference in service life of friction pairs, and achieve the effects of increasing service life, reducing mining costs and improving working environment.

Inactive Publication Date: 2010-08-18
HUBEI MILALION METALLURGICAL MACHINERY CO LTD
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Problems solved by technology

Although these heat treatment processes are conventional and seemingly mature processes, not only the service life of the friction pairs of domestic roller cone bits for mining is far lower than that of foreign mining roller cone bits

Method used

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  • Heat treatment process for mining cone bit friction pair
  • Heat treatment process for mining cone bit friction pair
  • Heat treatment process for mining cone bit friction pair

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[0009] Since it has been determined that the quenching temperature of the cone and the tooth is the main heat treatment parameter that affects the life of the friction pair, it has been determined that the carburization related parameters of the cone and the tooth are the most difficult to control heat treatment parameter, and a large number of series of experiments have found that the tooth The setting target of the carbon concentration of the carburized layer of the wheel and the tooth is the most critical parameter. therefore:

[0010] Take the tooth claw made of 20CrNiMo material as an example, the carburizing process is: strong infiltration temperature 930℃, diffusion temperature 900℃; strong infiltration and diffusion time depends on the requirements of the depth of the infiltration layer, and the final surface carbon concentration is controlled at 0.85%~1.05 %, the depth of the infiltration layer is 2.5mm~3.0mm. The quenching temperature is 815℃, the heating time depends ...

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Abstract

The invention relates to a heat treatment process for a mining cone bit friction pair, and solves the problem that products produced according to technical parameters related to the present domestic conventional heat treatment process have very short service life caused by abrasion. The heat treatment process for the mining cone bit friction pair is characterized by determining reasonable quenching and tempering temperatures of a cone and a jaw and related parameters such as a carburzing temperature, carbon concentration of a carburized layer and the like and combining hardness of parts and the parts of the mining cone bit friction pair, strength near a surface layer and surface smoothness to the optimum. Particularly, the heat treatment process for the mining cone bit friction pair achieves the stability and the reliability of the mining cone bit friction pair, guarantees the optimum combination of all of the parameters instead of an optimum state of each single parameter, guarantees the stable and reliable obtainment of the technical parameters instead of the optimum technical parameters, and can be widely applied to surface mining enterprises.

Description

1. Technical field [0001] The invention belongs to the mechanical manufacturing process of mining excavation equipment, and in particular relates to a heat treatment process of a mine-used roller cone bit motorcycle pair. 2. Background technology [0002] At present, the friction pair heat treatment process of domestic mining roller cone bit manufacturers is mainly: heat treatment of claws and cones: machining of forging blanks - carburizing - machining - quenching - tempering - machining; rolling The heat treatment process of the column and the ball is basically similar to the heat treatment process of the gear and claw. Although these heat treatment processes are conventional and seemingly mature processes, not only the service life of the friction pairs of domestic roller cone bits for mining is far lower than that of foreign mining roller cone bits, but also the life of friction pairs of different domestic manufacturers There are also great disparities. What's more, the...

Claims

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Application Information

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IPC IPC(8): C21D9/22C23C8/22C21D1/18C21D1/58
Inventor 汪涛
Owner HUBEI MILALION METALLURGICAL MACHINERY CO LTD
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