| 摘要 |
PROBLEM TO BE SOLVED: To provide a molded part for which the cost of a die is reduced, working flaws are less, and quality is excellent by roughly working a stock plate placed on an elastic body stored in a main retainer using a rigid die, precisely working it to form a plastically formed stock, and joining it through welding to manufacture a hollow member. SOLUTION: A stock of a tubular material 1 is placed on an elastic body 2, such as a urethane rubber stored in a main retainer 3, and a core die 4 and a pressing jig to press the core die 4 are installed thereon. The core die 4 is loaded by the pressing jig, the stock of the tubular material 1 is pressed into the elastic body 2, such as urethane rubber so as not to interfere with the pressing jig and wound around the core die 4 to form a semi-product. A sub retainer 6, in which an elastic body 7 such as urethane rubber is stored, is arranged on both sides of an intermediate stock as an upper die. The intermediate stock and the core die 4 are held by the sub retainers 6, and the pressing jig is removed. The sub retainer 6 is loaded to work the intermediate stock and obtain a plastically formed product.
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