Patent ID: 8715548
Filing Date: 2014-05-06
Classification: B22D,B29C

Abstract:
1. A mold fastening device comprising: a fixed die plate to which a fixed metal mold is secured; a rear plate coupled to the fixed die plate by tie bars; a movable die plate to which a movable metal mold is secured, which is movably provided between the rear plate and fixed die plate; a toggle mechanism comprising a cross-head, the toggle mechanism provided between the rear plate and movable die plate and configured to move the movable die plate back and forth among a plurality of positions and to lock the fixed metal mold and movable metal mold; and a drive motor coupled to the cross-head of the toggle mechanism, configured to drive the cross-head, and configured to, at each position of the moveable die plate, be controlled to have a rate of increase or decrease of rotational speed corresponding to the position of the moveable die plate, the rate corresponding to each position being determined by multiplying a rate of increase or decrease of rotational speed at each position of the moveable die plate for a desired torque by a reciprocal of a ratio of a speed of the moveable die plate to a speed of the cross-head; wherein: