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我厂在生产某汽车变速器零部件的过程中,遇到了如图1所示的拨叉轴。工序要求加工两交叉小孔φ5H10_0~(+0.048)mm和φ5H11_0~(+0.075)mm,由于两孔呈异面分布,这给钻模设计带来了一定难度,若采用模拟拨叉轴的形状及基准的方法,即从钻模的内孔模拟该轴的外圆φ16.4_(-0.027)~0mm,以V形插销模拟该轴的v形槽,设计成闭式的翻转钻模,则该钻模不仅结构和形状较复杂,而且排屑性差,工效低。为此,我们设计了如图2所示的开式翻转钻模。
I plant in the production of a car transmission parts process, encountered the fork shaft shown in Figure 1. Process requires the processing of two cross holes φ5H10_0 ~ (+0.048) mm and φ5H11_0 ~ (+0.075) mm, due to the two holes were heterogeneous distribution, which gives the drill design has brought a certain degree of difficulty, if the analog fork shaft shape And the benchmark method, that is, from the inner hole of the drill die to simulate the outer diameter of the shaft φ16.4 _ (- 0.027) ~ 0mm, with V-shaped pin to simulate the v-shaped groove of the shaft, designed as a closed flip drill, then The die is not only complicated in structure and shape, but also has poor chip evacuation and low work efficiency. To this end, we designed an open flip drill as shown in Figure 2.