聚碳酸酯超低温冷却车削表面形貌试验研究  

Experimental Study of Surface Morphology of Polycarbonate Ultra-low Temperature Cooling Turning

作　　者：包锐 刘阔 张杰[1] 韩灵生[1] 李建明[1] 左月帅 刘海波[1] 王永青[1] BAO Rui;LIU Kuo;ZHANG Jie;HAN Lingsheng;LI Jianming;ZUO Yueshuai;LIU Haibo;WANG Yongqing(National Key Laboratory of High Performance Precision Manufacturing,Dalian University of Technology,Dalian,Liaoning,116024)

机构地区：[1]大连理工大学高性能精密制造全国重点实验室,大连116024

出　　处：《中国机械工程》2024年第2期201-207,共7页China Mechanical Engineering

基　　金：国家自然科学基金(U20B2033);中央高校基本科研业务费专项资金(DUT22LAB505)。

摘　　要：针对聚碳酸酯加工时存在的耐热性差、变形、溶胀等问题,分别在干切削、水冷和超低温冷却条件下进行了聚碳酸酯的车削试验,并分析了材料加工表面的形貌,从分子链弛豫时间、银纹产生和脆-韧性转变的角度解释了加工表面形貌的差异。研究发现,聚碳酸酯干切削表面产生大量粗大银纹,水冷切削表面产生大量细密银纹,超低温冷却切削表面银纹较少,因此超低温冷却对提高聚碳酸酯的加工质量具有积极作用。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 positive 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 

分 类 号：TH161[机械工程—机械制造及自动化]