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Heat treatment method for roller cone

A heat treatment method and roller cone technology, applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve the problems of carburized layer and uneven hardness, large deformation of the inner hole of the roller cone, affecting the service life, etc. and uniform hardness, improve carburizing quality, and benefit the organization

Inactive Publication Date: 2018-09-28
武钢中冶工业技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the mining cone bit cone adopts the traditional heat treatment process, the inner hole of the cone will deform greatly, resulting in eccentric grinding, effective carburized layer and uneven hardness, and local soft spots, which greatly affect the service life.

Method used

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  • Heat treatment method for roller cone
  • Heat treatment method for roller cone
  • Heat treatment method for roller cone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The material of the cone is 15MnNi4Mo, including the following chemical composition in mass fraction Wt%: C 0.14%, Cr 0.18%, Ni 3.35%, Mo 0.36%, Si 0.28%, Mn 0.86%, S 0.004% and P 0.011%.

[0046] The gear manufacturing process is rough machining → carburizing, high temperature tempering → semi-finishing machining → quenching, low temperature tempering → finishing machining.

[0047] In this embodiment, carburizing and quenching are completed in a heat treatment carburizing and quenching multipurpose furnace; high-temperature tempering and low-temperature tempering are respectively completed in a high-temperature tempering furnace and a low-temperature tempering furnace. The specific steps are:

[0048] 1) Carburizing: Carburize the cone preform into the front chamber of the multi-purpose furnace, the temperature is controlled at 925°C, the strong infiltration period is 900 minutes, the carbon potential is 1.25%, the diffusion period is 240 minutes, the carbon potential...

Embodiment 2

[0062] The material of the cone is 15MnNi4Mo, including the following chemical composition in mass fraction Wt%: C 0.14%, Cr 0.18%, Ni 3.35%, Mo 0.36%, Si 0.28%, Mn 0.86%, S 0.004% and P 0.011%.

[0063] The embodiment of the present invention is used for the heat treatment method of cone, comprises the following steps:

[0064] 1) Carburizing: put the cone into the front chamber of the multi-purpose furnace for carburizing, the temperature is controlled at 930°C, the strong infiltration period is 850 minutes, the carbon potential is 1.3%, the diffusion period is 250 minutes, and the carbon potential is 1.2%. After the diffusion period is completed, Lower the temperature to 840°C and enter the back room to cool slowly to 460°C and leave the oven;

[0065] 2) High-temperature tempering: Put the cones that are slowly cooled after carburizing into the high-temperature tempering furnace, and the temperature is controlled at 690°C. After tempering for 10 hours under the protection ...

Embodiment 3

[0078] The material of the cone is 15MnNi4Mo, including the following chemical composition in mass fraction Wt%: C 0.14%, Cr 0.18%, Ni 3.35%, Mo 0.36%, Si 0.28%, Mn 0.86%, S 0.004% and P 0.011%.

[0079] The embodiment of the present invention is used for the heat treatment method of cone, comprises the following steps:

[0080] 1) Carburizing: put the cone into the front chamber of the multi-purpose furnace for carburizing, the temperature is controlled at 925-928°C, the strong infiltration period is 950 minutes, the carbon potential is 1.2%, the diffusion period is 230 minutes, the carbon potential is 0.95%, and the diffusion period is completed Afterwards, the temperature is lowered to 850°C and then slowly cooled to 430°C in the back room;

[0081] 2) High-temperature tempering: Put the cones that have been slowly cooled after carburizing into a high-temperature tempering furnace, and the temperature is controlled at 670°C. After tempering for 14 hours under the protection...

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Abstract

The invention provides a heat treatment method for a roller cone. The heat treatment method includes the following steps that (1) a roller cone pre-fabricated part is put in a furnace for carburizingtreatment, the temperature is controlled to be 925-930 DEG C, and the carburizing treatment includes a reinforcing carburizing period and a diffusion period; and after the diffusion period is over, aroller cone is cooled to 840-860 DEG C, subjected to slow cooling to 430-460 DEG C and then discharged out of the furnace; (2) the roller cone which is already subjected to carburizing treatment and slow cooling and discharged out of the furnace is subjected to high-temperature tempering treatment, the temperature is controlled to be 670-690 DEG C, tempering is performed for 10-14 hours under protection of N2, then the temperature is decreased to 430-460 DEG C, and the roller cone is discharged out of the furnace and subjected to air cooling; (3) the roller cone which is already subjected to high-temperature tempering treatment is subjected to quenching treatment, the temperature is controlled to be 850-870 DEG C, carbon potential is 0.3-0.5%, and after 100-140 minutes, oil cooling is performed till the temperature reaches 100-150 DEG C; and (4) the roller cone which is already subjected to quenching treatment is subjected to low-temperature tempering, the temperature is controlled tobe 220-230 DEG C, and after 10-15 hours, the roller cone is discharged out of the furnace and subjected to air cooling till the temperature reaches the indoor temperature. By means of the heat treatment method, deformation of inner holes of the roller cone is small, the effective carburized layer and hardness are uniform, and the heat treatment quality of the roller cone is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of drill bit manufacture, and in particular relates to a heat treatment method for a cone. Background technique [0002] Mining tri-cone bit is the main tool for drilling in open-pit mines. It is mainly composed of claws, cones and other small parts. spins, breaking rocks. The inner hole of the cone, the shaft head of the claw, the roller, the ball, etc. constitute a complex bearing system. As the most important part of the drill bit, the roller cone has particularly high heat treatment requirements, which has the greatest impact on the service life of the drill bit. How to improve the heat treatment quality of the mining roller cone bit, thereby improving the overall service life of the bit, is a difficult problem that the same industry has been working hard to find a solution. However, if the mining roller cone bit cone adopts the traditional heat treatment process, the inner hole of the cone will be de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C21D1/18C21D1/74C23C8/20
CPCC21D9/32C21D1/18C21D1/74C23C8/20
Inventor 明伟方
Owner 武钢中冶工业技术服务有限公司
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