在加工气阀和销子等圆柱形零件时,经常采用无心磨床加工外径。但因零件外径不同,因此要求导轮转速可变。现国内常采用简单的单相可控硅调速装置,调整导轮的速度。由于加工零件直径较小,要求导轮的转速也比较低,以便降低可控硅装置的输出电压和负载能力。在实际生产中,因毛坯超差或其它原因,造成单 Cylindrical parts such as valves and pins are often machined with a centerless grinder. However, due to different parts diameter, it requires variable speed guide wheel. Now the country often adopt a simple single-phase SCR speed control device, adjust the guide wheel speed. Due to the smaller diameter of the machined part, the speed of the guide wheel is also required to be lower in order to reduce the output voltage and load capacity of the thyristor. In the actual production, due to rough or other causes of excess, resulting in a single