在一般情况下,工件以平面作为定位基准时,夹具上采用固定支承或可调支承。但是,在有些情况下,为了保证工件的定位精度和可靠性,往往增加了支承点的数目,即使用浮动定位支承(或称自位支承)。这样,可以使零件加工质量更好。今介绍采用浮动定位两例。例一,在汽车前钢板弹簧支架(见图1)的2-φ22~(0.045)孔加工工序中,原钻夹具采用A及A_1面为主定位基准,三点支承,限制Z轴轴向移动,X轴和Y轴 Under normal circumstances, the workpiece as a plane to locate the benchmark, the fixture with fixed support or adjustable support. However, in some cases, in order to ensure the positioning accuracy and reliability of the workpiece, the number of support points is often increased, that is, the use of floating positioning support (or self-supporting). In this way, you can make the parts processed better quality. This introduction uses floating positioning two cases. Example 1 In the machining process of 2-φ22 ~ (0.045) holes of the front leaf spring bracket (see Figure 1), the original drill chuck adopts A and A_1 surfaces as the main positioning datum, three-point support to limit the axial movement of the Z axis , X axis and Y axis