近年来由于电子计算机的广泛应用,外储存器磁盘片(图1)的需要量越来越多。但该片是有较高精度和光洁度要求的铝质薄板,用通常的加工方法难以达到质和量的要求。又如高能激光光学系统中一些特殊形状的光学元件(图2～5)则难以、甚至无法用研磨和抛光的方法加工出理想的镜面。 In recent years due to the widespread use of electronic computers, external storage disk (Figure 1) needs more and more. However, the film is a high precision and finish requirements of the aluminum sheet, with the usual processing method is difficult to achieve the quality and quantity requirements. Another example, high-energy laser optical system in some special shape of the optical components (Figure 2 ~ 5) is difficult, or even grinding and polishing methods can not be the ideal mirror.