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Gear production process facilitating improvement of production efficiency and product quality

A technology of product quality and production process, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve problems affecting the stability and service life of gear transmission, surface layer detachment, gear hardening, etc., to achieve small overheating sensitivity, seepage The effect of small carbon quenching deformation and grain refinement of metallographic structure

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

[0004] In view of the above-mentioned prior art, the product obtained by heat treatment for gears made of 20CrMnTiH has a high 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 the gears being damaged in a relatively short period of time. Detachment of the surface layer occurs, which seriously affects the stability and service life of the gear transmission. The present invention provides a gear production process that is convenient for improving production efficiency and product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A gear production process that is convenient for improving production efficiency and product quality, including sequentially performing billet casting, cutting, heat treatment, finishing cutting and grinding. The raw material of the billet is 20CrMnTiH, and the billet casting process adopts a continuous casting machine. The casting speed of the continuous casting machine is 0.6-0.72m / min, and the casting slab adopts electromagnetic stirring of the mold, the current of the electromagnetic stirring is 400A, and the frequency is 2.5Hz. The heat treatment includes cutting the blank Heating to 600-920°C for carburizing treatment, and the above temperature is maintained for no less than 3 hours during the carburizing treatment. The heating is staged heating, respectively, the duration of the first stage is 600-870°C for 20-30min Preheating, carburizing at 870-920°C for 1.5-2h in the second stage, diffusion at 870-900°C for 1-1.2h in the third stage, slow cooling in the fourth ...

Embodiment 2

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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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Abstract

The invention discloses a gear production process facilitating the improvement of production efficiency and product quality. The gear production process includes the steps of blank casting, cutting, heat treatment, finishing cutting and ground finish, wherein blank casting, cutting, heat treatment, finishing cutting and ground finish are sequentially conducted. Raw materials for blank casting are 20CrMnTiH, a continuous casting machine is adopted in the blank casting process, the pulling rate of the continuous casting machine ranges from 0.6 m / min to 0.72 m / min, electromagnetic stirring of a crystallizer is adopted in the blank casting process, electromagnetic stirring currents are 400 A, and electromagnetic stirring frequency is 2.5 Hz. The heat treatment step includes the procedures that a cut blank is heated and carburized, heating in stages, namely, preheating at the first stage, carburization at the second stage, diffusion for 1 h to 1.2 h at the third stage and slow cooling at the fourth stage is adopted, the blank is slowly cooled to the temperature ranging from 500 DEG C to 600 DEG C and then quenched, the quenched blank is heated to the temperature ranging from 170 DEG C to 200 DEG C and then tempered after heat is preserved for not less than 3 h. The gear production process is simple in steps and short in process time, and product ingredients are even.

Description

technical field [0001] The invention relates to a transmission component manufacturing process for torque transmission, in particular to a gear production process which is convenient for improving production efficiency and product quality. 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14C23F17/00C21D9/32B22D11/115B22D11/16C23C8/22
CPCB23P15/14B22D11/115B22D11/16C21D9/32C21D2211/008C23C8/22C23F17/00
Inventor 吴光武
Owner CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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