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加工方孔内的4个凸台,原采用高速钢拉刀一次成形,因工件材料为铸铁,其冷硬层使拉刀很快损坏。改用刨插先去除冷硬层,使效率降低,为此我们设计了一种硬质合金焊接镶齿拉刀。 如图所示,该拉刀刀体材料为45钢,加工顺序为:粗加工—→调质—→半精加工—→铣镶齿槽—→焊接（铜焊）—→低温时效—→精磨。本拉刀拉削图形为渐成式,刀片材料为YG8硬质合金,考虑到镶齿的强度限制,采用了较小的齿升量fz,前角γ_0及刃带宽ba_1
The four bosses in the square hole of the processing are formed by a former high-speed steel broach. Since the workpiece material is cast iron, the chilled layer causes the broach to be damaged rapidly. Switch to the planing insert to remove the chilled layer, so that efficiency is reduced, therefore we designed a carbide welding inlay broach. As shown, the broach body material is 45 steel, the processing sequence is: roughing - → quenching and tempering - → semi-finishing - → milling inserts tooth groove - → welding (brazing) - → low temperature aging - → fine mill. The pull broach broaching graphics into a gradual, the blade material YG8 cemented carbide, taking into account the strength of the inlay limits, using a small tooth lift fz, rake angle γ_0 and edge width ba_1