我厂生产的套盘工件,材质为20Cr、表面镀铜后,渗碳深1～1.3mm;经热处理淬火,硬度为HRC60～65。为提高工件精度,钻孔前须磨去0.3～0.4mm放磨量。由于硬度高、渗碳层厚、磨削量少,给钻孔工作带来很大困难。针对以上问题,我们进行了多次试钻,修磨出加工渗碳工件的高效钻头。钻头主要部份革新是:减小外刃锋角,延长切削刃,降低长度切削负荷,使刃口加宽,有利于扩散热量。磨出浅月牙槽及内刃锋角,加大主偏角,增高钻芯尖,使其导向好,定心稳,强度得到加固,避免在钻削中钻头产生振动和出现定心磨 I set the factory production of sets of workpieces, made of 20Cr, after the surface of copper, carburizing deep 1 ~ 1.3mm; quenched by heat treatment, the hardness of HRC60 ~ 65. In order to improve the accuracy of the workpiece, 0.3 ~ 0.4mm should be worn before drilling. Due to high hardness, carburizing layer thickness, grinding less, to the drilling work is very difficult. In response to the above problems, we conducted a number of trial drilling, grinding grinding carburizing the workpiece high efficiency drill. The main part of the bit innovation is: to reduce the outer blade edge angle, to extend the cutting edge, reducing the length of the cutting load, so that cutting edge widening, is conducive to the proliferation of heat. Grind out the shallow crescent and the inner edge of the blade angle, increase the main declination, increase the drill tip, so that the guide is good, steady heart, the strength has been reinforced to prevent the bit in the drilling vibration and centering to avoid grinding