| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for draw-forming which reduces variation of formed dimension by suppressing the deflection of the central portion of a blank material set in a die, and an apparatus therefor. SOLUTION: The draw-forming method comprises a first step for obtaining the blank material 15 having an expansion zone 97 and an restraint zone 98 connected to a draw-formation zone 96, a second step for restraining the restraint zone by a first holder means 22 after setting the blank material in a metal die 12, and a third step for applying tensile force to the draw-formation zone and then restraining it by pressing the expansion zone in the shearing direction by a second holder means 23. The draw-forming apparatus 11 is equipped with the first holder means 22 to restrain an outer periphery 21 of the blank material 15 and the second holder means 23 inside the first holder means 22. A second closing and restraining position H2 of the second holder means is set at a position where a ram of the press machine is further lowered with respect to a closing and restraining position H1 of the first holder means 22. COPYRIGHT: (C)2006,JPO&NCIPI
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