【摘要】 由于钛合金和印刷电路板的难加工性使得微小孔的加工精度和表面质量难以保证,刀具技术成为提高加工效率的主要障碍。本文应用3种不同涂层钻头对钛合金和印刷电路板进行微小孔钻削对比试验,研究了进给速度与切削力和扭矩的关系,分析了刀具的磨损特征以及孔的表面质量和孔入口处的毛刺情况。结果表明:钻削印刷电路板的临界进给速度为1 591.2 mm/m in,涂层对钻削力和扭矩的影响不明显;类金钢石(DLC)涂层硬质合金钻头比普通硬质合金钻头和T iC涂层硬质合金钻头更适合加工钛合金材料微小孔。更多还原

【Abstract】 The micro-holes in the titanium alloy and the resinoid printed wiring board are used in many important highly new technological fields,such as aeronautics,astronautics,communication and electric industries.However,the poor machinability of the titanium alloy and the resinoid printed wiring board make it very difficult to guarantee the precision and the surface integrity of micro-holes.The contrastive experiments of the drilling micro-hole in the titanium alloy with three different kinds of drills are carried out.The relationships among feed speeds,cutting forces and torques are studied.Wearing characteristics of drills,the surface quality of holes and burs at the entrances of holes are analyzed.The conclusions show that the feed speed of 1 591.2 mm/min is the critical feed speed of the drilling resinoid printed wiring board,the effect of coatings on forces and torques in drilling resinoid printed wiring board is not obvious;DLC coated cemented tungsten carbides drills are more suitable for drilling the micro-hole in the titanium alloy than TiC coated and non-coated cemented tungsten carbides(WC-Co) drills.Experimental results are beneficial to the choice of the cutting tool,parameter optimization,and thus improving the surface quality of the micro-hole.更多还原