The toolmaker will make hard alloy substrate to provide sufficient thermal hardness to withstand the high temperature produced by processing…
With the application of stainless steel, alloys are often used in the case of mechanical strength and corrosion resistance. To improve the strength of the alloy, the metallurgist added nickel to the alloy. Iron/cr alloy is an iron/chromium/nickel alloy. These materials are called austenitic stainless steel, which are common in industrial applications today and require strength and corrosion resistance and heat. This alloy is usually used in petrochemical processes. In the food industry, hygienic standards require corrosion resistance and are usually used in harsh environments.
Inevitably, increasing the performance of the alloy, such as stainless steel, also increases the challenge of processing. The corrosion resistance of ferrite and martensitic stainless steel is basically chemical properties, so these alloys are no more difficult to machine than ordinary steel. However, adding nickel and other elements to austenitic stainless steel increases hardness, toughness, deformation resistance and thermal performance, thus reducing the machinability.
Understand the alloy
Until recently, austenitic stainless steel was not well known. Machinists believe that because of the stronger alloy, the mechanical cutting force will be higher, so it is necessary to use stronger and negative geometry tools to reduce the cutting parameters. However, this method produces short tool life, long slices, frequent burrs, unsatisfactory surface roughness and unwanted vibrations.
In practice, the mechanical cutting force of the austenitic stainless steel is not much higher than that of conventional steel. Most of the additional energy consumption of austenitic stainless steel is the result of its thermal properties. Metal cutting is a deformation process that produces too much heat when it is processed into the austenitic stainless steel.
The removal of heat from the cutting area is the most important. Unfortunately, austenitic stainless steel has low thermal conductivity except resistance to deformation. The wafers that are produced in the process of processing ordinary steel absorb and take away heat, but the austenitic stainless steel chip absorbs heat in a limited range. Because the thermal conductivity of the work piece itself is poor, the excess heat enters the tool, resulting in the cutting tool life.