Surface treatment of high speed steel tools

This paper reveals to cutting performance on 3 kinds of high speed steels throw away tips (including made by powder metallurgical process), which are compared surface treated tips by means of the coating process PVD-TiN(physical vapor deposition by the arc ion plating method) with untreated conventional tips. The results are as follows: "XI" tips by name have the highest hardness and performance on continuous cutting than the others, but they have the lowest toughness and larger chipping on intermittent cutting. The effects by PVD-TiN distinguish into each substrate materials, as "X" tips are hard to recommend appropriate uses. Hence, it is found that the selections of materials for cutting mode are ever important.