我厂常常遇到带有双键槽的轴类零件,其直径在Ф80～160毫米间,双键槽两侧面对轴中心线的对称度偏差为0.02～0.05毫米。我们在铣床上加工双键槽时,因无专用量检具在加工过程中随时检测其对称度,而造成对称度超差。为此,我们改制了一种用于双键槽类零件的对称度误差量具,可在加工过程中随时检测对称度误差,提高了产品合格率。 I often encounter plant with double-keyway shaft parts, the diameter of Ф80 ~ 160 mm, double-keyway on both sides of the shaft centerline symmetry deviation of 0.02 to 0.05 mm. We are in the milling double keyway, because no special amount of gages in the process of testing at any time the symmetry, resulting in symmetry tolerance. To this end, we have adapted a measure of symmetry error for double-key groove parts, which can detect the symmetry error and improve the product qualification rate at any time during the processing.