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硬质合金精孔钻(见图29),是一种加工精孔时,能达到较高光洁度的钻头。它在精扩45号钢精孔时,光洁度达▽8～▽9,精度达2～3级,比铰孔办法和用高速钢钻头加工精孔,光洁度明显提高1～2级,功效提高1倍。这种刀具的特点是:1.钻头可高精度扩孔,光洁度达▽8～9▽。也可直接钻孔,光洁度达▽4～▽5。2.钻头切削部分材料为硬质合金yT 15,导向部分(刀体)材料为合金工具钢9SiCr 或高速工具钢W18 Cr 4 V。3.在钻头外缘转角处磨出过渡修光刃(图中l_2)。形成修光刃锋角(过渡刃锋
Carbide hole drills (see Figure 29) are bits that can achieve higher finish when working with fine holes. It is refined in the No. 45 steel fine hole, the finish of ▽ 8 ~ ▽ 9, the accuracy of 2 to 3 than the reaming method and the use of high-speed steel drill bit fine hole, significantly improved the finish 1 to 2, 1 Times The characteristics of this tool are: 1. Drill bit can be precision reaming, finish ▽ 8 ~ 9 ▽. It can also be drilled directly with a finish of ▽ 4 to ▽ 5.2. The material of the drill bit is cemented yT 15 and the guide part (tool body) is made of alloy tool steel 9SiCr or high speed tool steel W18 Cr 4 V. 3. Grind the transition wiper at the corner of the drill bit rim (l_2 in the figure). Formation of polished blade angle (transitional blade front