| Stainless steel material is widely used in various industrial fields for its excellent synthetic property. However, its difficult machinability results in low machining efficiency and the surface roughness. The application of high-speed machining technology in the machining of stainless steel can greatly improve cutting efficiency and machining quality.In this paper, experiments investigation and theoretical analysis were carried out in the high-speed turning stainless steel (lCrl8Ni9Ti) such as proper tool materials and cutting parameters selection, surface roughness, chip pattern, tool wear and so on. The main researches were focused on following items:(1) To work out experimental planning of high-speed turning 1Cr18Ni9Ti.(2) Three kinds of cutting material were selected to machine stainless steel machining experiment such as ceramic cutting tools, cermets cutting tools and coated carbide cutting tools, in which the best range of each kind of tool material was founded. For example, LT55 was suitable to be machine lCrl8Ni9Ti as the cutting speed surpasses 120m/min and have a good wearable property.(3) Surface roughness was measured under different cutting conditions. Feed rate played the most important role in impacting surface roughness, and then cutting speed.(4) Chip patterns in different cutting speed with various cutting materials were analyzed. With the increase of turning speed, chip became shorter and was easy to be broken. For instance, serration chip appeared in high sped turning stainless steel with LT55;(5) Work hardening of austenitic stainless steel was analyzed. It was proved that work hardening had outstanding effects on tool wear.(6) Tool wear patterns and mechanism were analyzed according to the experiment results. Great heat was generated when 1Cr18Ni9Ti was machined in high speed and the main pattern of tool wear was grooving wear and tip chipping.It can be concluded that the application of high-speed technology in turningstainless steel can greatly improve product rate and part quality. This research can provide solutions in cutting tool material and cutting parameters selection as well as avoiding premature tool wear. |
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