Thermal treatment technology for clutch disc hub

A technology for clutch discs and hubs, which is applied in the heat treatment process of clutch discs and hubs, and can solve problems such as failure to meet the fatigue life requirements of clutch discs and hubs

Inactive Publication Date: 2015-07-08
HUBEI TRI RING CLUTCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims at the defect that the existing clutch disc hub disc heat treatment process is far from meeting the fatigue life requirements of the clutch disc hub disc, and provides a clutch disc hub disc heat treatment process

Method used

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  • Thermal treatment technology for clutch disc hub
  • Thermal treatment technology for clutch disc hub
  • Thermal treatment technology for clutch disc hub

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Embodiment Construction

[0016] Such as figure 1 As shown, in the heat treatment process of the clutch disc hub in the embodiment of the present invention, it includes the following steps:

[0017] S1. Select 20CrMo alloy structural steel as the manufacturing material of the clutch disc hub, put the 20CrMo disc hub into the heating furnace for heating, and control the carbon potential CP of the furnace gas at 0.5 to 0.7. The initial temperature in the furnace is about 850-900°C, put the 20CrMo hub into the high-temperature furnace, the 20CrMo hub will absorb part of the heat, and then the temperature in the furnace will start to rise, so figure 1 At the beginning, it was a V-shaped fold line. In 20CrMo alloy structural steel, the mass ratio of various elements is: C 0.17-0.24%; Si0.17-0.37%; Mn 0.40-0.70%; Mo 0.15-0.25%; Cr 0.80-1.10%; P≤0.03% ; S≤0.025%, the rest is Fe. Due to the increase of C content and the addition of Cr and Mo elements, the hardness of the center of the hub after carbonitridi...

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Abstract

The invention provides a thermal treatment technology for a clutch disc hub, which comprises the following steps: S1, selecting 20CrMo as the material of the clutch disc hub, placing the clutch disc hub made from 20CrMo into a heating furnace, heating clutch disc hub made from 20CrMo, and controlling the CP (Carbon Potential)of furnace gas to be 0.5-0.7; S2, when the clutch disc hub is heated to 850-870DEG C, pumping nitrogen, methyl alcohol and propane into the furnace; controlling the CP of furnace gas to 0.9-1.1, and keeping the state for 10min; S3, maintaining the temperature of the clutch disc hub made from 20CrMo to 850-870DEG C, and further pumping ammonia gas into the furnace, wherein the flow value of ammonia gas is 0.31-0.39m<3>/h; controlling the CP of furnace gas to 0.9-11, and keeping the state for 150-170min; S4, performing oil quenching of the clutch disc hub made from 20CrMo; then tempering the clutch disc hub made from 20CrMo, wherein the tempering temperature is controlled to 250-270DEG C, and the tempering time is controlled to 110-130min; then carrying out air cooling on the clutch disc hub made from 20CrMo to normal temperature; and S5, performing shot blasting treatment of the cooled clutch disc hub made from 20CrMo.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment technology, and in particular relates to the heat treatment technology of a clutch disc hub. Background technique [0002] Due to the torsional impact of the slave part of the clutch, the hub often suffers from torsional fatigue fracture. For example, in the Yuchai 350 series products, since the engine uses a 4-cylinder engine, during the first 2.5 times durability impact trial production process of the product, the fatigue life of the clutch disc hub is about 50,000 times (however, the actual requirement is 100,000 times), In particular, individual samples have been deformed and failed during the test. In the prior art, the material of the clutch disc hub is No. 10 steel with a carbon content of 0.1%, and through the heat treatment process of carbonitriding quenching + tempering, its fatigue life is only about 50,000 times, which is far from meeting the requirements of the clutch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00C23C8/32C23F17/00
Inventor 陈胜
Owner HUBEI TRI RING CLUTCH
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