摩托车发动机缸头上有两个摇臂轴孔的内端面需加工，其尺寸精度要求为20，表面粗糙度为Ra3．2μm。经分析最适宜的加工方法只能用立铣刀伸入缸内铣削。对X826铣床改装，由三坐标单板机自动控制，最为简便。为此设计了铰链式双联动夹具，以缸头坯件已铣削的大底面和两孔为定位基 Motorcycle engine cylinder head with two rocker shaft bore inner end surface to be processed, the dimensional accuracy requirements of 20, the surface roughness Ra3.2μm. The analysis of the most appropriate method of processing can only use the end milling into the cylinder milling. X826 milling machine modification, controlled by the three-coordinate single-board machine, the most simple. To this end, the design of a hinge-type double linkage fixture to cylinder head blank has been milling the large bottom and two holes for the positioning base