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不锈钢是一种难加工材料,由于它具有耐酸、耐腐蚀、耐磨损、耐热等优点而被广泛应用,其钢种亦随之增多,被较多地用于小型精密零件的有奥氏体不锈钢303、316L。本文介绍使用微型钻头对这些难加工材料进行精密小孔加工的情况。1、微型钻头的材料与热处理钻头用的材料有高速钢和硬质合金,鉴于微型钻头需具备较高的韧性及考虑钨的资源,微型钻头多用钼系高速钢SKH 9、SKH55。其中SKH 9的成份(%)如下:C:0.8～0.9,Si:<0.4,M:<0.4,P:<0.03,S:<0.03,Mo:4.5～5.5,W:5.5～6.7,V:1.6～3.2。
Stainless steel is a difficult to machine materials, because of its acid, corrosion resistance, abrasion resistance, heat resistance and other advantages are widely used, the steel also increased, is more used for small precision parts with austenitic Body stainless steel 303,316L. This article describes the use of micro-drill bit of these difficult-to-machine materials processing precision hole situation. 1, the material and heat treatment of micro-drill bit with high-speed steel and hard alloy materials used, given the micro-bit to be high toughness and tungsten resources to consider, micro-drill with molybdenum-based high-speed steel SKH 9, SKH55. Wherein the composition (%) of SKH 9 is as follows: C: 0.8-0.9, Si: <0.4, M: <0.4, P: <0.03, S: <0.03, Mo: 4.5-5.5, W: 5.5-6.7, 1.6 ~ 3.2.