Effect of material dynamic properties on the chip formation mechanism during high speed machining

Abstract

As an advanced manufacturing technology, high speed machining has been widely used in industries. Research on chip formation mechanism during high speed metal cutting plays vital role in further development of its disvantages and innovation of the machining equipment, and it can help to instruct the optimization of cutting parameters to control the chip morphology and improve the finished surface quality. The essence of chip morphology variation during high speed machining is determined by the material dynamic properties under different cuttig loads. Understanding the material dynamic properties under high strain rate is beneficial to reveal the chip deformation and failure mechanism during high speed machining. Meanwhile, reasonable design and application of high speed cutting experiments can be used as new test method of material dynamic properties. Based on the effect of material dynamic properties on the chip formaion process, this paper summarize the variation of material strength, brittle and ductile properties and microstructure combined with our research findings on chip formation mechanism in recent years.The mechanical conditions of fragmented chip formation under ultra high cutting speed is presented. The deficiency of traditional cutting theory are indicated in such aspects as the effect of stress state on chip deforamon and failure mechaism, and chip microstructure evolution, etc. In the end, the research tendency on chip formation mechanism during ultra high speed machining in the future is outlooked.