| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing the twist of an outside deformed material by hot extrusion. SOLUTION: In this method for preventing the twist of the outside deformed material by hot extrusion, the thickness of a packing ring arranged behind a die is increased by 0.3-0.5 mm, the packing ring is projected from the base of a die holder, and correction in accordance with the projection allowance is added to the die structure in the hot extruding method.
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