普通万能外圆磨床是不能磨椭圆工件的。我们设计制造了一个简单的磨椭圆夹具,安装在M1420外圆磨床上,就能对外径在160mm以内的各种内燃机活塞进行椭圆磨削,光洁度可达8～9,尺寸精度符合图纸要求。磨椭圆夹具不仅扩大了原磨床的使用范围,而且还具有结构简单、制造容易、性能稳定、工作可靠等优点。使用时只要把磨床头架和尾架拆下,将此磨夹具装上就行了,不再作任何改动。结构如图1,传动系统如图3。一、工作原理如图1所示,主轴Ⅰ与工件同轴转动,它与偏心轴Ⅲ的传动比为2:1。磨夹具和电动机(图中未表示出)的自重使偏心轮始终与固定在工作台上的导轮紧密地接触。当主轴Ⅰ连同工件旋转时,偏心轮就会以 Ordinary universal cylindrical grinder can not be polished oval workpiece. We designed and manufactured a simple grinding oval fixture, mounted on the M1420 cylindrical grinding machine, will be able to ellipse grinding of various internal combustion engine piston diameter of 160mm, finish up to 8 to 9, dimensional accuracy in line with the requirements of the drawings. Grinding oval fixture not only expanded the use of the original grinding machine, but also has the advantages of simple structure, easy manufacture, stable performance, reliable work. Use as long as the grinder headstock and tailstock removed, the grinding fixture installed on the line, no longer make any changes. Structure shown in Figure 1, the transmission system shown in Figure 3. First, the working principle shown in Figure 1, spindle Ⅰ and the workpiece coaxial rotation, eccentric shaft and its transmission ratio of 2: 1. The weight of the grinding jig and the motor (not shown) keeps the eccentric in intimate contact with the guide rollers fixed on the table. When the spindle I with the workpiece rotation, the eccentric will be