Gear production technology facilitating reducing composition segregation in gear thickness

A technology of component segregation and production process, which is applied in the field of transmission parts manufacturing process, can solve the problems affecting the stability and service life of gear transmission, the large difference in rack C content, and the detachment of the gear surface layer, etc., to achieve small overheating sensitivity, Carburizing and quenching deformation is small, the effect of wear resistance and strength is appropriate

Inactive Publication Date: 2014-11-05
CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the product obtained by heat treatment for gears made of 20CrMnTiH has a higher martensitic metallographic grade, and the gears obtained in this way are prone to work hardening under the action of external force during use, resulting in surface cracking of the gears in a relatively short period of time. Layer detachment seriously affects the stability and service life of gear transmission. Although the gear blank obtained by casting slabs is efficient, the difference in C content between the rack and the tooth surface is large, which affects the further improvement of the gear life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A gear production process that is conducive to reducing the composition segregation on the thickness of the gear, including casting billets, cutting processing, heat treatment, finishing cutting and grinding processing in sequence. The raw material of the casting billets is 20CrMnTiH, and the billet casting process adopts continuous casting machine, the casting speed of the continuous casting machine is 0.6-0.72m / min, the heat treatment includes heating the blank obtained by cutting to 600-920°C for carburizing treatment, and the above temperature is kept for a long time in the carburizing treatment In 3 hours, the heating is segmented heating, which are 600-870°C preheating with a duration of 20-30min in the first stage, carburizing at 870-920°C in 1.5-2h in the second stage, and carburizing at 870-920°C in the third stage 1 -1.2h diffusion at 870-900°C, slow cooling in the fourth stage, quenching when the blank is slowly cooled to 500-600°C, heating the quenched blank ...

Embodiment 2

[0026] This embodiment is further limited on the basis of Embodiment 1. In order to eliminate the oil pollution caused by mechanical equipment or the environment to the blank in the process route between cutting processes, and to prevent oil pollution from affecting the heat treatment effect, the cutting process and heat treatment also include: Degreasing and cleaning steps.

[0027] In order to obtain a good degreasing and cleaning effect and cleaning efficiency, the degreasing and cleaning step is to soak the blank for not less than 30 minutes with a degreasing and cleaning agent at a temperature of 50-65°C.

[0028] In order to further enhance the surface quality of the product, no less than 15 minutes of shot peening is included between the heat treatment and the fine cutting.

[0029] In order to prevent the oxidizing gas and the like from affecting the surface of the blank during the cooling process, the slow cooling is furnace cooling. Further, the quenching is oil coo...

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PUM

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Abstract

The invention discloses a gear production technology facilitating reducing composition segregation in gear thickness. The technology comprises the steps of blank casting, cutting, heat treatment, finish cutting and grinding in sequence. A raw material for blank casting is 20CrMnTiH. A continuous caster is adopted in the blank casting process, and the pulling rate of the continuous caster is 0.6 m / min-0.72 m / min. The heat treatment comprises the steps that blanks obtained through cutting are heated to 600 DEG C-920 DEG C for carburizing, wherein during carburizing, the hold time of the temperature is not less than 3 h, heating is staged heating composed of first-stage preheating, second-stage carburizing, third-stage diffusing for 1 h-1.2 h and fourth-stage slow cooling; the blanks are quenched after slow cooling and tempered after quenching. The technology is simple in step, the composition segregation in gear thickness is small, technology time is short, and gears which have the advantages that surface hardening layers do not easily come off, and impact resistance, abrasion resistance and intensity are suitable are convenient to obtain.

Description

technical field [0001] The invention relates to a transmission component manufacturing process for torque transmission, in particular to a gear production process that is beneficial to reducing component segregation on the gear thickness. Background technique [0002] Gears are key components in mechanical equipment, and the quality of gears is directly related to the service life of the entire equipment. The quality of the gear depends largely on the gear material and its heat treatment process. Therefore, manufacturers related to gear manufacturing both at home and abroad attach great importance to the research and development of gear materials and heat treatment technology. [0003] The material selection of gears in the prior art is generally based on the force and working environment of the gear in the transmission system. The heat treatment process is a means to ensure that the thickness of the gear surface hardening layer, the hardness of the gear surface and core, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14C23F17/00C21D9/32B22D11/16C23C8/22
CPCB23P15/14B22D11/16C21D9/32C21D2211/008C23C8/22C23F17/00
Inventor 吴光武
Owner CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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