| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion die for manufacturing a half-hollow shape material, with which precision of the thickness dimension of the half-hollow shape material is improved. SOLUTION: The extrusion die 1 has: a forming hole 3 for forming the half-hollow shape material 8; a tong part-forming part 22 for forming the tong part 82 of the half-hollow shape material 8; a tong opening part-forming part 23 for forming the tong opening part 83 of the half-hollow shape 8; a weld chamber 51 and a metal hole 55. In the weld chamber 51, a dummy forming part 6 is provided corresponding to the upstream side of the tong part-forming part 22. The width dimension t2 of the tip side portion 3a of the tong part-forming part 22 in the forming hole 3 is set larger than the thickness dimension t1 of the corresponding portion 8a of the tip side portion 3a in the half-hollow shape 8. COPYRIGHT: (C)2012,JPO&INPIT |
