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采用高速钢或涂层高速钢麻花钻进行加工,均不能获得满意的耐用度.图中所示的钻头是在整体硬质合金的刀体上镶有多晶金刚石刀片,其使用寿命较长.
The use of high-speed steel or coated HSS twist drills results in unsatisfactory durability. The drill shown in the figure has a polycrystalline diamond insert on the solid carbide body and has a long service life.