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众所周知,加工薄壁圆柱形零件时易产生变形和断裂。美国约翰逊航天中心采用了热膨胀系数较大的铜铍合金制成心轴夹具,可以很精确地加工仅千分之几英寸(十分之几毫米)壁厚的圆柱形零件。该航天中心在加工一种材料为因科(INCO)718铬镍铁合金的壁厚仅0.003英寸(0.76mm)的圆柱形薄壁零件时,原先的工艺是先磨削外径,然后再镗削和磨削内孔;或者采用另一种工艺,即先磨削内孔,然后利用标准的锥度心轴定位后再车削和磨削外径。上述两种工艺方法其废品率均超过50%。
As we all know, the processing of thin-walled cylindrical parts prone to deformation and fracture. The Johnson Space Center uses a copper beryllium alloy with a larger thermal expansion coefficient to make a mandrel chuck that can precisely shape cylindrical parts that are only a few tenths of an inch (tenths of a millimeter) thick. When machining a thin-walled cylindrical part of 0.003 in. (0.76 mm) thick with INCO 718 Inconel, the original process was to first grind the outside diameter and then to bored And grinding the bore; or use another process, which first grinding bore, and then use the standard taper mandrel positioning and then turning and grinding outside diameter. The above two methods of scrap rate of more than 50%.