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一般加工方孔,均采用单角刀通过转动刀具加工四面和直角,或用单刃平面刀具通过转台分度加工四面。我们经长期摸索,多次改进完善,制成了四面八刃方孔插刀,经使用证明,效果较好,其加工光洁度可达6～7。刀具结构如图所示。使用时,只需工作台纵横向进给,无需转动零件和刀具。由于刀具是宽面窄刃形,切削修光作用好。刀具材料为高速钢,经锻造成形、磨削加工,其四面相互不垂直度以不超过0.03为宜。
General processing square hole, are used single-angle knife by turning the cutter processing four and right angle, or single-edged plane cutter through the turntable indexing processing four sides. After long-term exploration, we improved and perfected many times and made a square knife with four edges and eight blades. After using it, the effect is good and the finish of the processing is up to 6 ~ 7. Tool structure as shown. When used, only the table feed length and breadth, without rotating parts and tools. As the tool is a wide narrow blade, cutting light repair good. Tool material is high-speed steel, the forging shape, grinding, the non-perpendicularity of the four sides of not more than 0.03 is appropriate.