A line of punch positions parallel to the Y datum line of a punch card .

和卡片的 Y基准线平行的一行 穿孔位置。

The paper also presents the investigation of microhardness surface and fracture zone feature crystalline structure and chemical composition of TiN TiC and Ti ( C_xN_y ) super-hard coatings . Finally the paper gives out application cases of the PCVD technique in the cold extrusion punch .

并对其 制 备的TiN、TiC、Ti（ C xN y）超硬膜 进行了显微硬度和化学成份等分析，最后介绍了该 项技术在冷挤压 冲头上的应用实例。