| 摘要 |
PROBLEM TO BE SOLVED: To prevent an occurrence of die lines such as lines and seams caused by corrugated aluminum oxide layers which are formed and adhere to a die during an extrusion work of an aluminum extruded section. SOLUTION: The aluminum extrusion die 1 having a bearing face 12 formed on an inner peripheral surface of the die hole 11 is constituted of two stepped faces with a slight step difference comprising a large-diameter part 13 on a container side and a small diameter part 14 on a bolster side and performs extrusion work of the aluminum extruded section 9. Division of the bearing face 12 prevents either formation of aluminum oxide on the small-diameter part 14 or occurrence of a corrugation and can eliminate the die line on the aluminum extruded section 9. COPYRIGHT: (C)2005,JPO&NCIPI
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