| 摘要 |
PROBLEM TO BE SOLVED: To dispense with the provision of the peripheral parts and hence, the surface area of the blank material can be reduced and the yield of a tubular material can be reduced and the yield of a tubular material can be increased, and further, a trimming process to remove the peripheral parts can be eliminated, and hence, processes can be concentrated and the production efficiency can be improved. SOLUTION: The spherical edge of a blank material is formed without restricting the peripheral edge, by placing the blank material on a fixed die 11 while positioning a material heated up to a specified temperature by a heater by the positional restrictive members 16, 17, 18 and bringing the movable die to engage with the fixed die in this state, by the use of the fixed die 11 and the movable die 12, at least three positional restrictive members 16, 17, 18 (two members are not shown), the blank material for a car body panel 42, and the heater.
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