| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of loud abnormal noise and reduction of durability, by reducing striking impact between a die holder 4 and a pressing block 7 and suppressing loss of accuracy in draw forming, when shortening a draw forming time of a vibration-proof bush B using a comparatively economical mechanical press such as a crank press. SOLUTION: The apparatus is composed by: installing a surface plate 10 on a bolster 2 of the crank press 1; arranging a die 3 and a die holder 4 on it; and having the pressing block 7 of a slide 6 strike and press the die holder 4 from upper side. The die holder 4 is guided only to move vertically by guide rods 13 and urged upward by a coil spring 1. Die pieces 30 of the die 3 are guided only to move radially by guiding grooves 10b on the surface plate 10 and urged outward by ring springs 34 made of urethane. COPYRIGHT: (C)2008,JPO&INPIT |
