A gear shaft heat treatment process

A gear shaft and process technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as weak anti-stripping and anti-accident capabilities, low surface hardness of the shaft body, shallow hardened layer, etc., to improve hardenability And hardenability, improve wear resistance and fatigue resistance, increase the effect of austenite stability

Active Publication Date: 2019-04-12
浙江永灵液压机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface hardness of the current gear shaft products is low, the hardened layer is shallow, and the anti-stripping and anti-accident capabilities are weak, which cannot meet the requirements of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A gear shaft heat treatment process, comprising the steps of:

[0019] (1) First normalize and heat the forged gear shaft blank to 1000°C for austenitization for 0.5h;

[0020] (2) Then cool to 850°C with the furnace for spheroidizing annealing for 2 hours, and then air cool to room temperature;

[0021] (3) After quenching and heating the gear shaft blank to 950°C for 1 hour, oil cooling;

[0022] (4) When the gear shaft blank is cooled to 350°C, put it into a tempering furnace, heat it at 500°C for 1 hour for tempering treatment, then cool it to 250°C with the furnace, and then take it out of the furnace and air-cool it to room temperature.

[0023] The forging step before the heat treatment process is to firstly heat the gear shaft blank to 1100° C., hold it for 2 hours, and then take it out of the furnace for forging.

[0024] The composition and weight percentage of the gear shaft blank are 0.25% C, 0.25% Si, 2.50% Cr, 1.50% Mn, 0.15% Mo, 0.15% V, 0.03% Y, and th...

Embodiment 2

[0028] A gear shaft heat treatment process, comprising the steps of:

[0029] (1) First normalize and heat the forged gear shaft blank to 1100° C. for austenitization for 0.5 h;

[0030] (2) Then cool to 900°C with the furnace for spheroidizing annealing for 1 hour, and then air cool to room temperature;

[0031] (3) After quenching and heating the gear shaft blank to 1050°C for 0.5h, oil cooling;

[0032] (4) When the gear shaft blank is cooled to 200°C, put it into a tempering furnace, heat it at 450°C for 2 hours and temper it, then cool it to 300°C with the furnace, and then take it out of the furnace and air cool it to room temperature.

[0033] The forging step before the heat treatment process is to firstly heat the gear shaft blank to 1200° C., hold it for 1 hour, and then take it out of the furnace for forging.

[0034] The composition and weight percentage of the gear shaft blank are 0.35% C, 0.35% Si, 3.50% Cr, 2.00% Mn, 0.20% Mo, 0.20% V, 0.05% Y, and the balance...

Embodiment 3

[0038] A gear shaft heat treatment process, comprising the steps of:

[0039] (1) First normalize and heat the forged gear shaft blank to 1050° C. for austenitization for 1 hour;

[0040] (2) Then cool to 880°C with the furnace for spheroidizing annealing for 1 hour, and then air cool to room temperature;

[0041] (3) After quenching and heating the gear shaft blank to 1000°C for 0.5h, oil cooling;

[0042] (4) When the gear shaft blank is cooled to 300°C, put it into a tempering furnace, heat it at 480°C for 2 hours and temper it, then cool it to 280°C with the furnace, and then take it out of the furnace and air cool it to room temperature.

[0043] The forging step before the heat treatment process is to firstly heat the gear shaft blank to 1150° C., hold it for 1 hour, and then take it out of the furnace for forging.

[0044] The composition and weight percentage of the gear shaft blank are 0.30% C, 0.35% Si, 3.00% Cr, 1.80% Mn, 0.15% Mo, 0.17% V, 0.04% Y, and the balanc...

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PUM

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Abstract

The invention relates to a heat treatment technology of a gear shaft. Through optimization of the temperature and time of the steps such as normalizing, spheroidizing annealing, quenching and tempering in the heat treatment technology, the mechanical property of the gear shaft is improved, and ideal hardness and hardness uniformity are obtained. Components of the gear shaft are optimized through adding of Mn, Cr, Mo, V and rare earth elements, thus the austenite stability of the gear shaft is remarkably improved, penetration hardening and hardenability of the gear shaft are improved, abrasiveresistance and anti-fatigue performance of a product are improved, and the surface of the gear shaft obtains martensite and bainite fine grain structures.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a gear shaft heat treatment process. Background technique [0002] Gear shafts can generally be made of carburized steel, but sometimes quenched and tempered steel is also used, especially for large gear shafts. In the repeated trial and adjustment of actual production, the steel for gear shafts has been systematically formed, and these steel types are relatively concentrated, such as CK45, 34CrMo, 42CrMo4, 34CrNiMo6 series steels in Germany; such steels in the United States are mainly 4130, 4340, 4150, 4140 steel; Japanese steel grades are SCM4, SNCM8, etc. The purpose of alloying these steels is to make the steel have good hardenability, so that the gear shaft can obtain a martensitic layer of sufficient thickness after quenching. Among these elements, manganese, chromium, molybdenum, etc. The effect of sex is more obvious. The second is to make the gear shaft maintain go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/28C21D1/28C21D1/32C21D1/18C22C38/02C22C38/38C22C38/22C22C38/24C21D6/00
CPCC21D1/18C21D1/28C21D1/32C21D6/002C21D9/28C21D2211/002C21D2211/008C21D2211/009C22C38/005C22C38/02C22C38/22C22C38/24C22C38/38
Inventor 刘仕爽
Owner 浙江永灵液压机械有限公司
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