在拉削过程中,为了断屑在拉刀齿上开出许多断屑槽。这些沟槽的在刀的切削部分形成了后角很小(=0～1.5°)的副切削刃。因而在主、副切削刃的过渡区形成许多易损段(即转角)。这些区段的磨损为线型刃段的1.5～5倍。使加工表而质量变坏并降低拉刀的工作性能。 During broaching, a large number of chip breakers are created on the broach teeth for chip breaking. These grooves form a minor cutting edge with a small relief angle (= 0 to 1.5 °) at the cutting portion of the blade. As a result, many vulnerable sections (ie corners) are formed in the transition zone between the primary and secondary cutting edges. The wear of these sections is 1.5 to 5 times the linear edge section. Make the quality of the processing table deteriorate and reduce the broach performance.