With the failure of diamond coated cutting tools, built-up edge (BUE) develops, and cutting force on the tool jumps imme切削过程中刀具金刚石薄膜失效时，会产生积屑瘤，且切削力骤然增大，通过监测积屑瘤的产生和切削力的变化，可以预报金刚石薄膜涂层刀具的失效。