| 摘要 |
An aluminum tube manufacturing device is provided that includes a female die having an internal shape identical with an external shape of an upper part of an aluminum tube to be formed thereby, including a mouth portion, a shoulder portion and a portion of a drum part of the tube. A punch having an external shape identical with the internal shape of the upper part of the tube that is to be formed forcibly extrudes the aluminum tube by applying pressure to a ring-shaped element of aluminum material loaded in the female die. A corner portion of the female die which joins the shoulder portion with the drum portion in the internal shape of the female die is formed as a smooth arc, and the punch is formed to have a maximum diameter portion thereof approaching a vertical internal surface of the drum portion below the arc-shaped corner portion of the female die when the punch is being pressed into the female die. The shoulder portion of the female die and the shoulder portion of the punch are formed to coact such that a space there between is maximized adjacent the maximum diameter portion of the punch.
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