| 摘要 |
PURPOSE:To easily and surely detach die-casting product having continuously undercut in the inner circumferential face from the die by arranging a first movable core and a second movable core as facing a fixed core in the die casting. CONSTITUTION:At the time of casting the product having the plural continuous undercut (projecting part ) in the inner circumferential face by a die casting, the sectional shape of fixed core 7 in them movable die 4 is narrower width as going to the end part and the first movable cores 8, 9 and the second movable cores 10, 11, which are mutually faced to the four faces of fixed core, are faced as movable and also the projecting parts are formed at the end outer circumferences of these movable cores. At the time of moving the moving die 4 backward, the first cores 8, 9 are knocked out from the movable die 4 from a knockout plate 16 and first knockout shafts 14, 14 to detach the die casting product 5 from the fixed core 7, and next, the second movable cores 10, 11 are knocked out by second knockout cylinders 22, 23 and second knockout shafts 23, 23 to detach the product 5 from the fixed core 7 and also the product is detached by detaching pin.
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