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Automobile gear shaft and forging method thereof

A technology for gear shafts and automobiles, which is applied in the direction of shafts, manufacturing tools, shafts and bearings, etc. It can solve the problems of hardness, fatigue resistance, and overload resistance, which are difficult to achieve the ideal state, so as to improve mechanical properties, reduce contamination, and improve surface quality. Good results

Inactive Publication Date: 2018-09-04
浙江恒利五金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The forging of the existing gear shaft has the problems of hardness, fatigue resistance and overload resistance, which are difficult to achieve the ideal state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A gear shaft for automobiles, which is composed of the following components by weight percentage: 0.16% carbon, 0.18% silicon, 0.80% manganese, 0.012% phosphorus, 0.021% sulfur, 0.6% chromium, 0.02% aluminum, 0.021% copper, Nickel 0.14%, molybdenum 3.00%, the balance is iron.

[0022] The forging method of the above-mentioned automobile gear shaft is forged according to the following steps:

[0023] A. Preheating treatment: Place the original blank in a non-oxidizing intermediate frequency induction heating furnace protected by a nitrogen atmosphere, heat and cool at least 3 times, the heating rate is 600°C / s, the heating temperature is 800°C, and the heating time for each time is 3min, the cooling rate is 500°C / s, each cooling time is 5min, and cooled to room temperature to obtain product A;

[0024] B, surface treatment: the surface of product A is polished, then cleaned and dried with a fan to obtain product B;

[0025] C. Place product B in a medium-frequency indu...

Embodiment 2

[0034] A gear shaft for an automobile, which is composed of the following components by weight percentage: 0.18% carbon, 0.20% silicon, 0.80% manganese, 0.008% phosphorus, 0.010% sulfur, 0.6% chromium, 0.020% aluminum, 0.015% copper, 0.18% nickel, 3.01% molybdenum, and the balance is iron.

[0035] The forging method of the above-mentioned automobile gear shaft is forged according to the following steps:

[0036] A. Preheating treatment: Place the original blank in a non-oxidizing intermediate frequency induction heating furnace protected by a nitrogen atmosphere, heat and cool at least 3 times, the heating rate is 500°C / s, the heating temperature is 900°C, and the heating time for each time is 3.5min, the cooling rate is 550°C / s, each cooling time is 4min, and cooled to room temperature to obtain product A;

[0037] B, surface treatment: the surface of product A is polished, then cleaned and dried with a fan to obtain product B;

[0038] C. Put product B in a medium-frequen...

Embodiment 3

[0047] A gear shaft for automobiles, which is composed of the following components by weight percentage: 0.19% carbon, 0.21% silicon, 0.85% manganese, 0.010% phosphorus, 0.020% sulfur, 0.6% chromium, 0.03% aluminum, 0.010% copper, 0.20% nickel, 3.15% molybdenum, and the balance is iron.

[0048] The forging method of the above-mentioned automobile gear shaft is forged according to the following steps:

[0049]A. Preheating treatment: Place the original billet in a non-oxidizing intermediate frequency induction heating furnace protected by a nitrogen atmosphere, heat and cool at least 3 times, the heating rate is 800°C / s, the heating temperature is 1200°C, and the heating time for each time is 4min, the cooling rate is 800°C / s, each cooling time is 5min, and cooled to room temperature to obtain product A;

[0050] B, surface treatment: the surface of product A is polished, then cleaned and dried with a fan to obtain product B;

[0051] C. Place product B in a medium-frequency...

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Abstract

The invention discloses an automobile gear shaft and a forging method thereof. The gear shaft comprises, by weight, 0.16-0.2% of carbon, 0.15-0.3% of silicon, 0.75-0.90% of manganese, 0-0.015% of phosphorus, 0-0.025% of sulfur, 0.5-1.1% of chromium, 0.01-0.03% of aluminum, 0-0.025% of copper, 0.12-0.28% of nickel, 2.98-3.58% of molybdenum and the balance iron. A raw material blank is subjected tocirculating heating and cooling many times, then subjected to surface treatment, cooled to 1100-1300 DEG C and kept warm; then, upsetting and drawing are carried out to reach the specification required by forge pieces, and the forging temperature is 850-1300 DEG C; the blank is drawn into an octagonal shape and distributed, small head drawing, rolling and finishing are carried out, and then the blank is subjected to thermal treatment and carburizing treatment. The hardness, fatigue resistance and overload resistance of the gear shaft are improved while the application stability of the gear shaft is ensured.

Description

technical field [0001] The invention relates to a gear shaft for automobiles, in particular to a gear shaft for automobiles and a forging method thereof. Background technique [0002] The forging of gear shaft includes free forging and die forging. Die forging can be divided into hot die forging, warm forging and cold forging. Gear shafts for automobiles need to transmit large power and bear large loads, requiring materials that not only have high Excellent bending fatigue strength and contact fatigue strength, as well as high overload resistance, at the same time put forward higher requirements for the forging process. The forging of existing gear shafts has the problems of hardness, fatigue resistance, and overload resistance that are difficult to reach the ideal state. Contents of the invention [0003] The object of the present invention is to provide a gear shaft for automobiles and a forging method thereof. The invention improves the hardness, anti-fatigue strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21D9/30C21D1/26C23C8/22C21D1/18C23F17/00F16C3/02B21J5/08B21J5/06B21K1/06
CPCC22C38/02B21J5/06B21J5/08B21K1/06C21D1/18C21D1/26C21D9/30C22C38/04C22C38/06C22C38/42C22C38/44C23C8/22C23F17/00F16C3/02
Inventor 程堂春
Owner 浙江恒利五金科技有限公司
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