| 摘要 |
PROBLEM TO BE SOLVED: To provide a draw forming device which restrains deflection at the center of a blank material set in a mold and minimizes dimensional variations in a formed product. SOLUTION: In the draw forming device 11, a blank holder 16 comprises a first retaining means 32 which binds the outermost circumference 31 of the blank material 15, and a second retaining means 33 which is placed inward of the first retaining means 32. Due to the descent of a double-acting press 17 the retaining position B1 of the first retaining means 32 is made a position where the first retaining means 32 holds the blank material 15 ahead of the second retaining means 33, and a position where the double-acting press 17 descends further is made the retaining position B2 of the second retaining means 33. A mold (cope) 27 is supported slidably by the second retaining means 33 and is placed away from an inner slider 21. The first and second retaining means 32 and 33 are fixed in an integrated manner to an outer slider 22 which is placed outward of the inner slider 21. COPYRIGHT: (C)2006,JPO&NCIPI
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