Aiming at the problems of poor heat resistance,deformation,and swelling,a turning test of polycarbonate was carried out under dry cutting,water cooling,ultra-low temperature cooling,and the shape of the surface was analyzed.The morphological differences of machined surfaces were explained from the perspective of relaxation time of molecular chains,crazing generation,and brittle-toughness transition.It is found that,on polycarbonate surfaces,dry cutting produces a large number of strong crazing,water-cooled cutting produced a large number of fine crazing,while the ultra-low temperature cooling cutting produces less crazing.Therefore,ultra-low temperature cooling has a pos-itive effect on improving the processing quality of polycarbonates.
关键词
聚碳酸酯/超低温冷却切削/银纹/加工表面形貌
Key words
polycarbonate/ultra-low temperature cooling cutting/crazing/machining surface morphology
维普
万方数据