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Cold treatment process for carburized gear part

A technology of gear parts and cold treatment, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of restricting the internal quality of gear parts, prolonging the production cycle, increasing production costs, etc., and suppressing the risk of grinding cracks and processing time Short, less liquid nitrogen consumption effect

Inactive Publication Date: 2020-06-05
XIAN COAL MINING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The coal shearer is an underground fully mechanized mining equipment, which is widely used in coal mines. When the coal shearer is used, the industrial and mining conditions are extremely harsh. The gear parts used by the coal shearer operate at low speed and heavy load, and the hardness requirements for the gear parts are very high. High, the gear parts used in existing coal mining machines are generally made of 18Cr2Ni4WA and 20Cr2Ni4A. The production process is: sawing → forging → normalizing, high temperature tempering → rough machining → carburizing → high temperature tempering → processing → quenching → low temperature tempering Fire→grinding, the surface hardness of gear parts prepared by general technical requirements is 664HV~766HV, in order to ensure that the surface hardness of gear parts after grinding meets the technical requirements, the hardness must be greater than 688HV after heat treatment and quenching, but in actual production, the preparation The hardness of gear parts after heat treatment, carburizing and quenching is mostly between 642HV~688HV. In order to ensure the required hardness, heat treatment often needs to be repeated, which will lead to increased gear deformation and poor wear resistance, which seriously restricts the gear parts. Intrinsic quality also prolongs the production cycle and increases production costs

Method used

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  • Cold treatment process for carburized gear part
  • Cold treatment process for carburized gear part
  • Cold treatment process for carburized gear part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] Step one, will (diameter × height) gear parts of 20Cr2Ni4A material are carburized to obtain carburized gear parts; the depth of the carburized layer on the gear parts is 4.8mm after detection;

[0028] Step 2. Carburized gear parts are subjected to high-temperature tempering treatment, and then quenching treatment; the high-temperature tempering treatment is carried out twice, and the condition of the high-temperature tempering treatment is to keep warm at 680° C. for 3.2 hours, and the quenching treatment Carried out at 800°C;

[0029] Step 3, performing a low-temperature tempering treatment on the carburized gear parts after the quenching treatment in step 2; the low-temperature tempering treatment is kept at 180° C. for 3.2 hours;

[0030] Step 4. Perform cold treatment on the carburized gear parts after the low-temperature tempering treatment in step 3; the cold treatment process is: use liquid nitrogen to c...

Embodiment 2

[0046] This embodiment includes the following steps:

[0047] Step one, will (diameter × height) gear parts of 18Cr2Ni4WA material are carburized to obtain carburized gear parts; the depth of the carburized layer on the detected gear parts is 5.3mm;

[0048] Step 2. Carburized gear parts are subjected to high-temperature tempering treatment, and then quenching treatment; the high-temperature tempering treatment is carried out 3 times, and the condition of the high-temperature tempering treatment is to keep warm at 670 ° C for 3.5 hours, and the quenching treatment Carried out at 815°C;

[0049] Step 3, performing a low-temperature tempering treatment on the carburized gear parts after the quenching treatment in step 2; the low-temperature tempering treatment is kept at 200° C. for 3 hours;

[0050] Step 4. Perform cold treatment on the carburized gear parts after the low-temperature tempering treatment in step 3; the cold treatment process is: use liquid nitrogen to cool th...

Embodiment 3

[0059] This embodiment includes the following steps:

[0060] Step one, will (diameter × height) gear parts of 18Cr2Ni4WA material are carburized to obtain carburized gear parts; the depth of the carburized layer on the gear parts is 4.6mm after detection;

[0061] Step 2. Carburized gear parts are subjected to high-temperature tempering treatment, and then quenching treatment; the high-temperature tempering treatment is carried out 3 times, and the condition of the high-temperature tempering treatment is to keep warm at 690 ° C for 3 hours, and the quenching treatment is carried out at Carried out at 795°C;

[0062] Step 3, performing low-temperature tempering treatment on the carburized gear parts after quenching treatment in step 2; the low-temperature tempering treatment is kept at 160° C. for 3.5 hours;

[0063] Step 4. Perform cold treatment on the carburized gear parts after the low-temperature tempering treatment in step 3; the cold treatment process is: use liquid ...

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Abstract

The invention discloses a cold treatment process for a carburized gear part. The process comprises the following steps that firstly, a gear part is carburized to obtain the carburized gear part; secondly, the carburized gear part is subjected to high-temperature tempering and then subjected to quenching; thirdly, the quenched carburized gear part is subjected to low-temperature tempering; fourthly, the carburized gear part obtained after low-temperature tempering is subjected to cold treatment; fifthly, the carburized gear part obtained after cold treatment is warmed up; and sixthly, the warmed-up carburized gear part is subjected to low-temperature tempering. According to the process, before cold treatment, quenching stress of the carburized gear part is eliminated through low-temperaturetempering, the cracking risk during cold treatment is reduced, cold treatment cracks are avoided, the carburized gear part is subjected to cold treatment, the hardness and wear resistance of the carburized gear part are obviously improved, the cracking risk is avoided, and the risk of grinding cracks is suppressed; and the carburized gear part obtained after cold treatment is warmed up, cold treatment stress is reduced, and the risk that the carburized gear part cracks is reduced.

Description

technical field [0001] The invention belongs to the technical field of material manufacturing / processing, and in particular relates to a cold treatment process for carburized gear parts. Background technique [0002] The coal shearer is an underground fully mechanized mining equipment, which is widely used in coal mines. When the coal shearer is used, the industrial and mining conditions are extremely harsh. The gear parts used by the coal shearer operate at low speed and heavy load, and the hardness requirements for the gear parts are very high. High, the gear parts used in existing coal mining machines are generally made of 18Cr2Ni4WA and 20Cr2Ni4A. The production process is: sawing → forging → normalizing, high temperature tempering → rough machining → carburizing → high temperature tempering → processing → quenching → low temperature tempering Fire→grinding, the surface hardness of gear parts prepared by general technical requirements is 664HV~766HV, in order to ensure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/04C21D9/32
CPCC21D1/18C21D6/04C21D9/32
Inventor 朱瑞芳刘永刚米琇娟
Owner XIAN COAL MINING MACHINERY
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