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Heat treatment process of metal workpiece

A metal workpiece and process technology, which is applied in the field of heat treatment technology to improve the fatigue pitting wear resistance of workpieces, can solve problems such as gear fatigue pitting wear and other problems, and achieve the effect of improving strength and high strength

Active Publication Date: 2011-11-02
新大洲本田摩托(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem to be solved by the present invention is that the gears in the prior art are prone to fatigue pitting and wear.

Method used

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  • Heat treatment process of metal workpiece
  • Heat treatment process of metal workpiece
  • Heat treatment process of metal workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Under a protective atmosphere, preheat the gear at 770±5°C for 25±5 minutes, and feed methanol while preheating, and the flow rate of methanol is 3.8L / min.

[0032] After preheating, raise the temperature to 870±5°C at the fastest speed, and pass ammonia gas at this temperature, and the flow rate of ammonia gas is 2.5L / min. Methane is introduced to adjust the carbon potential to 1.23%, and the intensive infiltration stage of carbonitriding is carried out.

[0033] After 135 minutes, it enters the diffusion stage, the nitrogen flow rate is adjusted to 1.5L / min, and the carbon potential is adjusted to 1.07%.

[0034] After 50 minutes, lower the temperature to 830±5°C as soon as possible, keep warm at this temperature, stop the introduction of ammonia gas, and adjust the carbon potential to 0.95%.

[0035] Heat preservation for 35 minutes, oil cooling and quenching, the quenching temperature is 120±5°C, and the time is 30 minutes.

[0036] After the quenching is complete...

Embodiment 2

[0038] Under a protective atmosphere, preheat the gear at 770±5°C for 25 minutes, and feed methanol while preheating, and the flow rate of methanol is 3.8L / min.

[0039] After preheating, raise the temperature to 870±5°C at the fastest speed, and pass ammonia gas at this temperature, and the flow rate of ammonia gas is 2.5L / min. The carbon potential is adjusted to 1.18% by introducing methane, and the intensive infiltration stage of carbonitriding is carried out.

[0040] After 125 minutes, it enters the diffusion stage, the nitrogen flow rate is adjusted to 1.5L / min, and the carbon potential is adjusted to 1.08%.

[0041] After 45 minutes, lower the temperature to 830±5°C as soon as possible, and keep it warm at this temperature. At the same time, stop the introduction of ammonia gas, and adjust the carbon potential to 1.02%.

[0042] Heat preservation for 45 minutes, oil cooling and quenching, the quenching temperature is 120±5°C, and the time is 30 minutes.

[0043] After...

Embodiment 3

[0045] Under a protective atmosphere, preheat the gear at 770±5°C for 25 minutes, and feed methanol while preheating, and the flow rate of methanol is 3.8L / min.

[0046] After preheating, raise the temperature to 870±5°C at the fastest speed, and stabilize the temperature after a certain period of time (such as 35 minutes). At this temperature, ammonia gas is introduced, and the flow rate of ammonia gas is 2.5L / min. Methane is introduced to adjust the carbon potential to 1.20%, and the intensive infiltration stage of carbonitriding is carried out.

[0047] After 130 minutes, it enters the diffusion stage, the nitrogen flow rate is adjusted to 1.5L / min, and the carbon potential is adjusted to 1.10%.

[0048] After 45 minutes, lower the temperature to 830±5°C as soon as possible, and keep it warm at this temperature. At the same time, stop the introduction of ammonia gas, and adjust the carbon potential to 0.98%.

[0049] Heat preservation for 45 minutes, oil cooling and quench...

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Abstract

The invention provides a heat treatment process of a metal workpiece. The heat treatment process comprises the following steps: firstly preheating the workpiece to be treated in the presence of shielding gas; heating for carbonitriding; quenching; and tempering and cooling. The heat-treated workpiece has the advantages of high strength and good wear resistance; and a durability test and a main physiochemical performance test show that the workpiece meets technological requirements.

Description

technical field [0001] The invention relates to a heat treatment process for a metal workpiece, in particular to a heat treatment process for improving the fatigue pitting corrosion resistance of the workpiece. Background technique [0002] The general working principle of the 125 men's straddle motorcycle engine is that the mixture of air and fuel (usually gasoline) in the cylinder is compressed and ignited to form an explosion, which drives the crankshaft to provide power, that is, the process of converting heat energy into kinetic energy; Then the crankshaft transmits the power through the primary gear through the different speed ratios of different gears of the main shaft / counter shaft, and transmits the power to the active output gear on the counter shaft at low to high speeds, and then drives the rear wheels through the chain to achieve motorcycle The purpose of driving. Then, the fifth-speed gear on the main shaft of the main / counter shaft transmission mechanism is a...

Claims

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Application Information

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IPC IPC(8): C23C8/30C23C8/02C23C8/80C21D1/18
Inventor 杨清泉
Owner 新大洲本田摩托(苏州)有限公司
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