A study on improving the efficiency of driven rotary machining of hardened steel (Effect of Al content and cutting environment on tool life under high-speed conditions)

Abstract

Recently, the development of high-hardness coating materials has made it possible to cut high-hardness steels, but machining efficiency is limited. Production efficiency can be improved if high efficiency machining can be achieved while maintaining the surface accuracy required for finish machining of hardened steel. This requires optimization of tool material and cutting environment. In this study, driven rotary machining of hardened steel with a (Ti,Al)N coating with high Al content was conducted to investigate the effect of different cutting environments on tool life. The results showed that under micro dry ice powder system (DIPS) at a cutting speed of 3.34 m/s, tool life was extended by using (Ti,Al)N coated tools with the highest Al content compared to the Dry environment. However, thermal crack occurred due to the cooling effect of DIPS at high speed of 5.00 m/s, and tool life is significantly shortened.

Keywords

• driven rotary machining
• hardened steel
• tialn coated film
• dips
• cutting temperature
• thermal crack