我厂生产的如图1所示的零件是初轧厂的运输辊道座,由多个座对接成输送线。对接处用80H8键槽和四个螺栓连接,其中,2-φ44 H7为定位螺栓,因此必须保证孔和键槽的位置精度。由于该零件两端的形状成轴对称,所以设计了如图2所示的钻模板。钻模板以工件的80H8键槽和一个侧面定位,利用2-φ45 I plant the production shown in Figure 1 is the initial part of the rolling mill roller conveyor seat, docked by a number of blocks into the transmission line. Butt joints with 80H8 keyway and four bolts, of which, 2-φ44 H7 positioning bolts, and therefore must be to ensure the accuracy of the location of the hole and keyway. Since the shape of the two ends of the part is axisymmetric, a drilling template as shown in FIG. 2 is designed. Drill template to the workpiece 80H8 keyway and a side positioning, the use of 2-φ45