Experience in the application of nitriding in a glow discharge to increase the efficiency of gear processing by the method of grinding

Abstract

© 2020 IOP Publishing Ltd. All rights reserved. The article presents the experience of increasing the resistance by nitriding the gear tool using the method of grinding, using the Skywing technology. Tool material P6M5K5 with hardness 62-64HRC (analog: 1.3243, HS6-5-2-5 - Germany, W6Mo5Cr4V2Co5-China). Gear material is 20crnimoh structural alloy steel (analog 1.6523, 21NiCrMo2 - Germany). Nitriding was carried out by ionoplasmic nitriding, in an ammonia gas environment, at a temperature of 450 degrees Celsius, for 40 hours, to a depth of 0.6 mm. In addition, a wear-resistant coating based on alumotite carbonitrides was applied, with the activation of the surfaces by a hydroabrasive installation based on aluminum oxide. Washing was carried out in an environment of alkaline surfactants. This experience led to rapid destruction of the cutting edges. Experience has shown that the saturation of tool steel with nitrogen did not yield the expected dispersed nitrides. The material has become fragle. This is due to the oversaturation of tool steel with alloying elements. In continuation, it is recommended to conduct a new experiment with heating to 500-520 degrees Celsius and nitrogen in a glow discharge lasting 2-3 hours for an expected layer of 20-40 microns. In order to avoid loss of adhesion of the wear-resistant coating for some nitrogen etching, it is assumed that an argon volume is introduced into the gas mixture.