氟金云母玻璃陶瓷钻削过程中的刀具磨损特性研究

分别用硬质合金刀具和高速钢刀具钻削氟金云母可加工玻璃陶瓷材料,通过对刀具磨损表面形貌的观察和刀具主后刀面磨损带宽度的测试,分析了氟金云母玻璃陶瓷钻削加工中的刀具磨损过程、磨损形式及其机制.结果表明:与低碳钢相比,玻璃陶瓷材料钻削时刀具磨损较大,采用高速钢刀具时磨损比较剧烈,不适合氟金云母玻璃陶瓷材料的钻削加工;硬质合金刀具的磨损形态包括主后刀面磨损、副后刀面磨损以及横刃磨损,硬质合金钻头副后刀面的磨损为氟金云母玻璃陶瓷材料钻削加工的显著特征,磨料磨损和粘着磨损为硬质合金刀具的主要磨损形式;崩刃为硬质合金刀具非正常磨损的主要形式.

Tool Wear Characteristics During Drilling Processes of Fluorophlogopite Glass Ceramic

Fluorophlogopite machinable glass ceramic was drilled with tungsten-cobalt carbide and high-speed steel drill bits respectively. Mild steel was drilled with tungsten-cobalt carbide drill bits to compare wears of tools. Machining experiments were carried out on driller with fixed feed load. Tool worn surface were observed with SEM and three-dimension optical microscope. Wears on tool major flank were measured with optical microscope. EDS spectrum was processed to test the compositions of adherence on tool wear surface. Wear processes, wear forms and reasons of tool wear are analyzed. Results show that higher tool wear is obtained in glass ceramics drilling compared with mild steel drilling processes. Because of higher wear, highspeed steel drill bits are not suitable for drilling of fluorophlogopite glass ceramics. Wear of tungsten-cobalt carbide drill bits occurred on major flank, minor flank and chisel edge. Remarkable characteristics during machinable fluorophlogopite drilling process is existence of wear on minor flank. Abrasive wear and adhesive wear are the main reasons for the formation of tungsten-cobalt carbide tool wear. Breakage damage of cutting edge is the abnormal wear form of carbide drill bits.