The work aims to investigate the effect of cryogenic air minimum quantity lubrication(CMQL)technology on cutting temperature,plastic deformation of material,and quality of machined surface.The application test of CMQL was carried out to machining of TC6 titanium alloy.The changes of surface defect,micro morphology and roughness of TC6 material under different machining parameters were compared between conventional cutting at room temperature and low temperature cutting at-27 ℃,and the application characteristics of CMQL machining were analyzed.Compared with conventional cutting at normal temperature,CMQL machining could significantly reduce the plastic deformation of TC6 materials caused by heat accumulation during processing,inhibit the galling phenomenon caused by internal friction between materials and tools in the cutting defor-mation area,reduce defects such as chip sticking,scratches,pits,tears,and side flows,and effectively improve the quality of the machined surface.The surface roughness machined by CMQL was 19％lower than that of dry cutting at room temperature.In cutting with variable machining parameters,increasing the feed rate increased the roughness value of the machined surface by 49％,which had the greatest effect on the quality of the machined surface.Increasing the depth of cut increases the roughness of the machined surface by 43％,and had the secondary effect on the surface quality.The increase of cutting speed had the least ef-fect on the surface quality,but the increase of back cutting quantity and cutting speed was easy to cause vibration in the process system and lead to unstable cutting.Therefore,the application of CMQL machining technology in the processing of TC6 materi-als has certain help to improve the processing quality and meet the needs of low-carbon industry.
关键词
TC6钛合金/低温冷风微量润滑/加工表面质量/粗糙度/车削参数
Key words
TC6 titanium alloy/cryogenic air minimum quantity lubrication(CMQL)/machined surface quality/roughness/turning parameter
维普
万方数据