氟金云母陶瓷车削加工中材料去除的试验研究

分别用高速钢、硬质合金和Si3N4陶瓷刀具对氟金云母可加工陶瓷进行车削加工试验,测试了材料加工表面粗糙度,并以扫描电镜观察了加工表面。分析了氟金云母陶瓷车削加工中材料去除特点、材料去除规律和材料去除机理,考察了刀具材料对材料去除率和表面加工质量的影响。其材料去除过程可分为初期阶段、高效阶段和后期阶段。高速钢刀具因材料去除率较低不适于氟金云母陶瓷的车削加工,硬质合金刀具加工的表面粗糙度Ra值最低,质量较好。初步分析了氟金云母陶瓷材料去除机制,其材料断裂去除以穿晶断裂模式为主,沿晶断裂模式同时存在。

Experimental study on materials removal in turning of fluorophlogopite

The machinable fluorophlogopite was turned with tungsten-cobalt carbide, high￣speed steel and ceramics turning tools respectively. Surface roughness was tested. The machining surface was observed with SEM. During turning of fluorophlogopite glass-ceramics, the characteristics, rules and mechanisms of material removal were analyzed. It is studied that tools materials have influence on material removal rate and surface crudity. The process of material removal can be divided into three periods: early period, high efficiency period and later period. The high-speed steel tool is not suitable for turning fluorophlogopite ce- ramics because of low materials removal rate. And surface machined with tungsten-cobalt carbide presents smallness in surface roughness values. The test results indicate that material removal of fluorophlogopite ceramics during turning operations contains two modes, transgranular fracture and intergranular fracture.