Gear production technology facilitating reducing composition segregation in gear thickness

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...

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.