在外圆磨床上加工外圆,多半是根据工件的内径和长度选用专用的心轴。这种心轴虽然制造简单,但利用率不高,尤其是在小批生产和单件生产中,更不经济。我们根据生产的要求,设计了如图所示的可调节心轴。这种心轴能加工350～550毫米长的工件。由于锥形定位套6和7是斜面,所以加工直径也可以在一定范围内变化。心轴的结构也比较简单,它由活动心子1、锥形定位套6和7、活动接套2、插销5和钢环4等组成。活动心子1上,每隔15毫米占一交叉成“×”字的孔。活动接套2和衬套3上,每隔20毫米也占一个“×”字孔。钻孔的多少,视 Cylindrical grinding machine cylindrical processing, mostly based on the workpiece diameter and length of the selection of special mandrel. Although this kind of mandrel is simple to manufacture, its utilization rate is not high, especially in small-batch production and single-piece production. According to the production requirements, we designed the adjustable mandrel as shown in the picture. Such a mandrel can process 350 to 550 mm long workpieces. Since the conical sleeves 6 and 7 are beveled, the machining diameter can also be varied within a certain range. The structure of the mandrel is also relatively simple, which consists of a movable heart 1, conical positioning sleeve 6 and 7, a movable sleeve 2, a latch 5 and a steel ring 4. Moving heart 1, every 15 mm account for a cross into a “x” hole. Activity sleeve 2 and bushing 3, every 20 mm also account for a “×” hole. How many holes, depending on