轴与孔之间间隙很小(过渡配合)时,不易于装配并易于发生零件表面啃伤或卡死现象。现介绍一种轴端预导向结构(图1),它能使轴顺利地导入孔中,而适用于要求频繁、快速装卸被加工工件的某些夹具,如高精度大直径定位销轴的夹具、精密心轴和塑料心轴等。我厂曾设计了一种安装于动力头上可浮动的轴孔定位夹具(图2),要求动力头每次快进 When the gap between the shaft and the hole is small (transition fit), it is not easy to assemble and prone to barking or jamming on the part surface. Now introduce a shaft-end pre-guide structure (Figure 1), which allows the smooth introduction of the hole into the hole, and for frequent and rapid loading and unloading of the workpiece to be processed some of the fixture, such as high-precision large-diameter positioning pin fixture , Precision mandrel and plastic mandrel. I plant has designed a floating head mounted on the power head positioning hole fixture (Figure 2), requiring power head each fast forward