变速磨削抑振的试验分析

Experimental Analysis on Suppressing Chatter in Grinding at Regular Changing Speed

通过在磨削外圆中，使砂轮或工件的转速按一定规律变化的试验分析表明，砂轮或工件变速都有抑制颤振的作用，其原因是变速改变了砂轮和工件间的瞬时速比，使径向磨削力均值下降，减小了砂轮和工件间的接触刚度。

The results obtained theoretically and experimentally are as follows. Chatter can be suppressed, when the velocity of the wheel or workpiece is changed regularly during plunge and length grinding, the suppression effect derived by altering the wheel velocity is better. The main cause of producing chatter in the length grinding is still the regenerative effect. The reason of suppressing the chatter under the condition of changing the grinding speed is that altering the speed during grinding can change the twinkling speed ratio between wheel and workpiece, reduce the average grinding force and the contact stiffness between the wheel and workpiece. As a result, the coefficient of increasing the chatter can be made less, and the stability of the system increased.