我公司SF6断路器中的阀体零件上有许多密封槽 (图 1 ) ,这些密封槽不在一个面上 ,用普通机床加工比较困难。图　 1图 1中上端的密封槽与油孔相通 ,我们设计了复合锪钻 ,结构如图 2。由钻头 1、螺钉 2、刀体3构成。刀体 3由刀头(W1 8Cr4V)和莫氏尾柄 (45钢 )图　 21 钻头　 2 There are many sealing grooves on the body parts of SF6 circuit breaker in our company (Fig. 1). These sealing grooves are not on one surface, and machining with ordinary machines is more difficult. Figure 1 Figure 1 in the upper end of the seal groove connected with the oil hole, we designed a composite drill, the structure shown in Figure 2. By the drill 1, 2 screws, knife body 3 composition. Tool body 3 consists of bit (W1 8Cr4V) and Morse tail handle (45 steel) Fig.21 Bit2