Effect of hydrogen adsorption by 40Kh steel on the force parameters of cutting, stresses in a tool, and its wear resistance

We established that a decrease in the components of cutting forces owing to electrolytic hydrogen adsorption by blanks does not yet guarantee a positive effect of hydrogen treatment on the durability of cutting tools. The approach based on the determination of local force parameters of cutting, such as the tangential and normal stresses at the tool working surfaces, is more promising. We established the effect of hydrogen adsorption on the durability of cutting toolsK v 20 andK v 60. The speedv20 orv60 that corresponds to a durability of 20 or 60 min, respectively, served as a durability index. The coefficient of the effect of hydrogen adsorption on the durability of the cutting tool (K v 20 andK v 60) was calculated as the ratio between the values ofv20 orv60 for cutting of hydrogenated and original blanks. The durability of cutting tools of high-speed steel and hard alloy increases when using comparatively soft modes of hydrogen adsorption (the current density is less than 0.1 kA/m2). For harder modes, a negative effect of the treatment is already observed, despite a decrease in the components of cutting forces. Hydrogen-adsorption technologies have better prospects as applied to tools of hard alloys.