| 摘要 |
<p>The extrusion die has on the front surface, a bearing opening of the shape of a given section, a bearing surface corresponding to the section of the bearing opening formed over a length from the front surface to the rear surface of the die. A draught is formed from the bearing surface toward the rear surface. The bearing surface, at each position on the inner circumferential line of the bearing, is formed in such a fashion as to have a bearing length which is determined in accordance with the shape of the bearing opening at that position. The depth position where the intersection point exists is determined in accordance with the shape of the bearing opening.</p> |
