The main difficulties of machining stainless steel are as follows:
1.High cutting force and high cutting temperature
In machining stainless steel, the material has high strength, large tangential stress and large plastic deformation during cutting, so it has great cutting force. In addition, the material has a poor thermal conductivity, causing the cutting temperature to rise and the high temperature often concentrated in the narrow region near the cutting edge of the tool, thus speeding up the tool wear.
2.Serious work hardening
Austenitic stainless steel and some high temperature alloy stainless steels are austenitic structures, and the tendency of work hardening is great during machining, it usually several times of plain carbon steel, the tool is cut in the work hardened area, and will shorten the life of the tool.
3.Easy sticking knife
Both austenitic stainless steel and martensitic stainless steel exist the characteristics of chip toughness, high cutting temperature in the process of machining. When the tough chips flow through the rake face, will produce bonding, welding and other sticky knife phenomenon, affecting the surface roughness of the machined parts.
4.Tool wear accelerated
Stainless steel materials generally contain high melting point elements, plasticity, high cutting temperature, so that tool wear faster, sharpening, changing knives frequently, thereby affecting the production efficiency and improving the tool cost.