| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion molding die for a metallic material capable of obtaining an extruded product of high quality while ensuring sufficient strength and durability. SOLUTION: The die 10 of an extrusion molding tool E1 has a die case 20 having a pressure receiving part 21 and a male die 30 and a female die 40 which are respectively held at its inner side and its front part. Further, in the die 10, a metallic material pressure receiving surface 22 of a pressure receiving part 21 is formed in a backwardly projecting shape. Port holes 24 are formed in an outer circumference of the pressure receiving part 21. The axis A2 of the portholes 24 is inclined with respect to the axis A1 of the die case 20 so as to be brought close to the axis A1 of the die case 20 toward the downstream side. A circumferential surface 62a of a die holding hole 62 of a die holder 60 of the extrusion molding tool E1 is formed in a tapered surface which is gradually expanded toward the downstream side. An outer circumferential surface 25a of a front part of the die case 20 is formed in a tapered surface corresponding to the circumferential surface 62a of the die holding hole 62. COPYRIGHT: (C)2008,JPO&INPIT
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