Study Of Low-temperature Cold Air Cutting Performance Of Typical Difficult-to-machine Materials

Typical difficult-to-machine materials such as the precipitation stainless steel,super-alloy and titanium alloy,have been widely used in various fields because of its high strength,high hardness,high wear resistance,corrosion resistance and other characteristics.But its cutting performance cause a series of problems,for example,high cutting force,high cutting temperature,serious tool wear and so on,which reduces the machining efficiency and improves the processing cost.The traditional method processing of difficult-to-machine materials will use a large number of cutting fluid,which not only pollute the environment but also seriously affect the physical and mental health of workers.Low temperature air technology is a kind of green machining method,which conform to the state policy of green manufacturing.This paper mainly analyzes the cutting mechanism of low temperature air cutting,and makes research and analysis about the brittle characteristics,the lubricate mechanism and the chip breaking mechanisms of metal materials under low temperature cold condition.Meanwhile,the cutting performance of typical difficult-to-machine materials,such as the precipitation stainless steel,super-alloy and titanium alloy,were discussed.Through cutting experiment under normal conditions and low temperature air conditions,the influence on cutting force,tool wear,chip shape and surface processing quality of typical difficult-to-machine materials were analyzed.The experimental results show that the low temperature air has better effects on cutting difficult-to-machine materials.It can reduce temperature distribution and cutting force,improve tool life and suface processing quality,decrease the use of cutting fluid and mitigate environmental pollution.Thus,low temperature air cutting is an efficient and environment friendly way to solve the problem of cutting difficult-to-machine materials.