| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an extrusion die for manufacturing a semi-hollow material, having sufficient durability, and allowing the production of the high-quality semi-hollow material. <P>SOLUTION: This extrusion die 1 includes a shaping hole 3, a tongue part shaping part 22, a tongue opening part shaping part 23, a weld chamber 51, and metal holes 55. In a front view state in which the extrusion die 1 is viewed along an extrusion direction from the upstream side, by virtual division lines La passing on respective bridges 53, the shaping hole 3 is divided into a plurality of division portions 3b each corresponding to each metal hole 55, and having areas nearly equal to one another. In the front view state, the respective holes 55 are formed such that they have areas nearly equal to one another. <P>COPYRIGHT: (C)2012,JPO&INPIT |
