单晶磁铁硬度高、脆性大、切削性能差,用刀具难以加工,用电解法或电化学法加工生产率不高,精度也低。由于上述原因国外研究制造了加工Φ4～Φ6mm孔的钻头,钻头用YG8硬质合金做成整体式(见附图),也可以用YG6或YG8硬质合金片做成镶装式。鉴于在加工中出口和入口容易造成破裂(出口特别大),所以在钻削加工中工件两端面采用金属垫圈消除这个缺陷,加工之前把垫圈紧压在磁铁的上下两端 Single-crystal magnet hardness, brittleness, poor cutting performance, difficult to process with a tool, with electrolysis or electrochemical method of processing productivity is not high, the accuracy is low. For the above reasons, foreign research and manufacture of processing Φ4 ~ Φ6mm hole drill bit made of YG8 cemented carbide (see photo), can also be made of YG6 or YG8 carbide inlaid. In view of the processing of exports and imports are likely to cause rupture (export particularly large), so the two sides of the workpiece in the drilling process using metal washers to eliminate this defect, before processing the washer pressed against the upper and lower ends of the magnet