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在机械加工中,图1所示的双联齿轮经热处理淬硬后需磨内孔。为了保证齿轮节圆和内孔的同轴度要求,我厂采用了凸轮式磨齿轮内孔夹具,经过多年生产使用,证明该夹具定心精度高、使用方便、有一定的可调性,是一种比较理想的齿轮磨孔夹具。一、夹具结构双联齿轮的内孔磨削加工要求以大小两齿轮的节圆定位,轴向以齿轮的端面定位。夹具的结构如图2所示。齿轮节径的定位元件采用滚针。滚针直接可按被加工齿轮的模数1.7～1.9倍选取。图1双联齿轮的模数m=3,故我们以φ5滚针和φ6滚针分别作为大小两齿轮的定位元件。夹具体和定心凸轮环的内孔具有阿基米德螺旋面,使齿轮节圆得到定心及夹紧。定心凸轮环内孔上的阿基米德螺旋
In machining, double gear shown in Figure 1 after heat treatment hardened bore to be worn. In order to ensure the concentricity of the gear pitch circle and the inner hole, our factory adopts the cam-type grinding gear inner hole fixture. After years of production and use, it proves that the fixture centering accuracy is high, easy to use and adjustable. An ideal gear grinding hole fixture. First, the fixture structure Double-hole gear grinding process requires the size of the two-gear positioning of the pitch circle, the axial end of the gear positioning. Fixture structure shown in Figure 2. Gear pitch diameter positioning element needle roller. Needle can be directly processed gear modulus 1.7 to 1.9 times selected. Figure 1 double gear modulus m = 3, so we use φ5 needle and φ6 needle as the size of the positioning of the two gear components. The inner bore of the clamp body and the centering cam ring has an Archimedes screw surface to center and pinch the pitch circle. Centering the Archimedes screw in the hole of the cam ring