一、前言 有机玻璃是一种热塑性高聚物,与金属相比有很大的热敏感性和热膨胀系数,但导热率却很低。在机械加工中,由于它比金属强度低、韧性差,表面温度影响大,机械性能变化范围广,切削阻抗变化激烈,容易产生脆性破坏,工件表面易出现龟裂现象,直接影响到工 I. Introduction Plexiglass is a thermoplastic polymer, compared with the metal has a great thermal sensitivity and thermal expansion coefficient, but the thermal conductivity is very low. In machining, because it is lower than the metal strength, toughness, the impact of surface temperature, mechanical properties of a wide range of changes in cutting resistance fierce, prone to brittle failure, the workpiece surface prone to cracking phenomenon, a direct impact on the work