MOLD CLAMPING DEVICE AND MOLDING METHOD

摘要

A movable plate (4) capable of advance and retraction with respect to a fixed plate is provided with a tie bar connecting device (12) for meshing a split nut (18) with the multi-groove section (16) of a tie bar (10), and a mold clamping cylinder (20) operable with the split nut (18) serving as a reaction force point. The mold clamping cylinder (20) comprises a main piston (22) contacting the split nut (18), and an auxiliary piston (24) movable relative to the main piston (22). It is arranged that the movable plate (4) is stopped just before the position at which the movable mold contacts the fixed mold, and in this state the split nut (18) is reliably meshed with the multi-groove section (16). Thereafter, the auxiliary piston (24) and main piston (22) are moved integrally with respect to the movable plate (4) so as to effect mold contacting and mold clamping. After molding, the auxiliary piston (24) and main piston (22) are relatively moved to effect mold release.