| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an extrusion die having a structure capable of selectively cooling a bearing part. Ž<P>SOLUTION: The extrusion die (20) has the bearing part (25) for forming the inside surface (2a) of an extrusion material (1) and is provided with a passage (26) for cooling media, which passes through the inside of the bearing part (25) and has an opening part (28) on the end face of the downstream side. In the passage (26a) for the cooling media, heat exchanging efficiency in the inside (29) of the bearing part (25) is set higher than the heat exchanging efficiency in the part (26a) of the upstream side. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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