我厂某产品有一弓形件（见图1），材料为HT200，左、右两件成对使用，要求两件R648。尺寸必须一致。为此，两件圆弧面必须同时加工。过去在立式车床上车成，精度和粗糙度均达不到使用要求。现在改装的导轨磨床上增设一套工装，采用粗车后磨削外圆弧面的工艺，很好地解决了上述 I plant a product has a bow (see Figure 1), the material for the HT200, left and right pairs of two pieces of use, requiring two R648. The dimensions must be the same. For this purpose, the two arc surfaces must be machined at the same time. In the past on the vertical lathe into the car, precision and roughness are less than the use requirements. Now modified rail grinder to add a set of tooling, the use of crude car after grinding arc process, a good solution to the above