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键糟拉刀使用经验 (一) 铁牛-55拖拉机的后轮轮毂上有一条宽20毫米的键槽(图1),是用同廓式键槽拉刀在卧式拉床上两次拉成的。工件材料是45号铸钢,硬度HB156～241,拉削长度156毫米。拉刀齿升量为0.1毫米。以前在拉削过程中经常出现“扎刀”(拉刀啃进工件内部),造成刀齿崩掉,甚至拉刀折断。经分析认为这是由于零件上只有一个键槽,以致键槽拉刀工作时单边切削,作用在拉刀上的力不能平衡,引起了拉刀偏移。在偏移时,零件材料由于抵抗不住锋利
Key to bad broach experience (a) Trent-55 tractor wheel hub has a 20-mm wide keyway (Figure 1), is the use of contour-type keyway broach pull in the horizontal bed two times. The workpiece material is 45 cast steel, hardness HB156 ~ 241, broaching length of 156 mm. Broach tooth lift 0.1 mm. In the past during the broaching process often appear “Zhadao” (broach bite into the workpiece), resulting in knife collapse, or Broken Broach. The analysis that this is because there is only one keyway on the part, so that keyway broach work unilateral cutting, the role of the broach on the force can not be balanced, causing the broach offset. In the offset, the parts of the material can not resist sharp