| 摘要 |
A closing device (100) closes an open end portion of a tubular body (1) using a die (2). The closing device (100) includes a core (3) that is inserted into the tubular body (1) and closes the open end portion of the tubular body (1) on the opposite side of the die (2), first heating means (53) that heat the tubular body (1) during a closing process and are also capable of heating the core (3), and second heating means (54) that heat the die (2). At the start of the closing process, the core (3) and the die (2) are preheated by the first heating means (53) and the second heating means (54) respectively, and the closing process is begun when the temperature difference between the tubular body (1) and the core (3) and die (2) is small.
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