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某机起落架的许多零件材料是结构钢30CrMnSiNi2A和30CrMnSiA,这些材料热处理后,硬度已达HRC 38～43,而所要加工的孔多是二、三级精度,光洁度▽7。用一般高速钢刀具进行铰孔,则难以胜任。为达到精度和光洁度的要求,在工艺上大多采用了YT15硬质合金铰刀铰孔,铰孔时转速较高,这时如在钻模设计上用一般钻套,则钻套及铰刀引导部分会因铰刀高速旋转产生摩擦而急剧磨损,这样就无法保证工艺要求。部标准HB1870-71《高速铰孔用旋转导套(滚珠式)》即为解决此间题而采用的结构,见图1。
A lot of parts landing gear materials are structural steel 30CrMnSiNi2A and 30CrMnSiA, these materials after heat treatment, the hardness has reached HRC 38 ~ 43, and the hole to be processed are more than two, three precision, finish ▽ 7. With high-speed steel cutting tools reaming, it is difficult to do. In order to achieve the requirements of accuracy and finish, most of the YT15 carbide reamer reaming holes are used in the process, and the rotation speed is higher when the reaming hole is used. In this case, if the conventional drill sleeve is used in the die design, the drill sleeve and the reamer guide Part of the reamer friction due to high-speed rotation and rapid wear and tear, so you can not guarantee the process requirements. Ministry standard HB1870-71 “high-speed reaming with a guide sleeve (ball-type)” is to solve this problem and the structure used, see Figure 1.