外国磨床(Litton(工业公司)——英国专利1504276(1975,12,24-美国) 用多砂轮磨床磨削阶梯轴工件时,砂轮由液压趋近至工件,然后由步进电机按选定的进给速率传动至最终位置,接着砂轮停留一些时候作无火花磨削。有上下两爪的中心架夹持工件两端和中间。当液压油缸传动和上爪结合的一钮状元件时,上爪前进;当液压油缸传动与下爪结合的凸轮系统元件时,下爪前进。也用第二个步进电机通过齿轮驱动一轴旋转,此 Foreign Grinding Machines (Litton - UK Patent No. 1504276 (1975, 12, 24-USA)) When grinding multi-grinding machines with stepped grinding shafts, the grinding wheel approaches the workpiece with hydraulic pressure and is then driven by a stepper motor The feed rate is transmitted to the final position followed by the grinding wheel for sparkless grinding. The upper and lower jaws hold the ends and the center of the work piece. When the hydraulic cylinder actuates a button-like element that engages the upper jaw, When the hydraulic cylinder drives a cam system element that is engaged with the lower jaw, the lower jaw advances and a second stepping motor is also used to drive the shaft to rotate through the gear,