Gear production process facilitating gear surface quality

A technology of surface quality and production process, applied in the field of transmission parts manufacturing process, can solve the problems of surface layer detachment, affecting the stability and service life of gear transmission, gear hardening, etc., and achieve small carburizing and quenching deformation and small overheating sensitivity properties, the effect of less retained austenite content

Inactive Publication Date: 2014-10-29
CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
View PDF5 Cites 1 Cited by
  • 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 invention provides a gear production process that is beneficial to the surface quality of the gear

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A gear production process that is beneficial to the surface quality of gears, comprising sequential bar material cutting, cutting, heat treatment, fine cutting and grinding, the material of the bar is 20CrMnTiH, and the heat treatment includes cutting to obtain The blank is heated to 830-920°C for carburizing treatment, and the above temperature is kept for no less than 3 hours during the carburizing treatment, slowly cooled after carburizing treatment, and the second heating is performed when the blank is slowly cooled to no higher than 550°C And keep it warm for not less than 2 hours, then quench it, heat the quenched blank to 170-200°C for the third time and keep it warm for not less than 3h for tempering, the second heating is to heat the blank to 840-870°C, so The above carburizing treatment includes the preheating stage, strong carburizing stage and diffusion stage carried out successively;

[0021] The preheating stage is to place the blank in methanol and propan...

Embodiment 2

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 blank is heated for ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a gear production process facilitating gear surface quality. The gear production process comprises the bar blanking, the cutting, the heat treatment, the fine cutting and the grinding performed in sequence; the material of a bar is 20CrMnTiH; the heat treatment comprises the following steps: when a blank obtained by the cutting is heated to 830-920 DEG C, the carburizing treatment is performed; and in the carburizing treatment, the temperature keeping time is not lower than 3 h; the slow cooling is performed after the carburizing treatment; when the blank is slowly cooled not higher than 550 DEG C, the secondary heating is performed, and the insulation is performed not lower than 2 h; then, the quenching is performed; the quenched blank is heated for the third time to 170-200 DEG C; the insulation is performed not lower than 3 h; then, the tempering is performed; the blank is heated to 840-870 DEG C in the secondary heating; and the carburizing treatment comprises the preheating phase, the strong carburizing phase and the dispersing phase performed in sequence. The process is simple in steps, and is convenient to obtain a gear with differently released surface hardened layer and proper impact resistance, wear resistance and strength.

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 the surface quality of the gear. 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, and the corrosion resi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D9/32C21D1/18
Inventor 吴光武
Owner CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap