| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wire drawing die 1 with which tensile residual stress generated on the surface of a metal wire after wire drawing is suppressed. <P>SOLUTION: There is provided the wire drawing die 1 in which a die hole 2 including a reduction part 5 and a bearing part 6 is formed, and the surface of the reduction part is mirror-finished and the surface of the bearing part is made rougher than the mirror finishing. The surface roughness of the surface of the reduction part 5 is <1.40 μm in ten point average roughness Rz and <0.19 μm in a center line average roughness Ra. The surface roughness of the bearing part 6 is 1.40-1.90 μm in a ten point average roughness Rz and 0.19-0.28 μm in a center line average roughness Ra. <P>COPYRIGHT: (C)2013,JPO&INPIT |
