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我厂用高强度合金钢做的零件很多;这些零件都是带孔的,不但精度要求高,而且要经过热处理,使它的强度达到6b=140～160公斤/公厘~2。这种零件的孔,如果用合金工具钢或高速钢刀具加工,刀具使用寿命不但短,而且也达不到精度要求。为此,我厂采用了硬质合金结构的铰刀(硬质合金的牌号为T_(15)K_3),以高速切削的方法来加工内孔,生产效率比一般铰刀提高5～10倍,孔的精度可达3～2级,表面光洁度为9～10。铰刀的结构如附图所示。
I plant a lot of parts made of high strength alloy steel; these parts are perforated, not only high precision, but also to heat treatment, so that its strength 6b = 140 ~ 160 kg / mm ~ 2. The hole in this part, if using alloy tool steel or high speed steel tool processing, the tool life is not only short, but also can not meet the accuracy requirements. To this end, I plant the reamer carbide structure (carbide grade T_ (15) K_3), high-speed cutting method to the processing of the hole, the production efficiency than the general reamer 5 to 10 times, Hole accuracy of up to 3 to 2, the surface finish of 9 to 10. Reamer structure as shown in the figure.