Mold clamping apparatus and molding machine

A mold clamping apparatus of a molding machine injecting and filling a molding material to the cavity defined by a pair of dies, wherein a mold clamping apparatus comprises:

• a fixed die plate fixed on a base and holding one of the pair of the dies;
• a movable die plate holding the other of the pair of the dies and provided in a opening or closing direction on the base movably;
• a plurality of tie bars having pistons and coupled sections and dividing mold clamping force given to the dies between the pistons and the coupled sections;
• a plurality of cylinders for mold clamping equipped in one of the fixed die plate or the movable die plate, accommodating the pistons of a plurality of the tie bars respectively, and to which pressure-adjusted operating fluid for generating the mold clamping force is supplied;
• a plurality of uniting units being equipped in another of the fixed die plate or the movable die plate and uniting releasably with a plurality of the tie bars respectively by meshing with coupled sections of a plurality of the tie bars respectively;
• a displacement detection unit for detecting displacement of the piston of a plurality of the tie bars generated by injection and filling of a molding material to the cavity, and
• a control unit adjusting pressure of the operating fluid supplied to a plurality of the cylinders for mold clamping independently to suppress displacement detected by the displacement detection unit.

A molding machine comprising:

• a fixed die plate fixed on a base and holding one of a pair of dies;
• a movable die plate holding the other of the pair of the dies and provided in the opening or closing direction on the base movably;
• a plurality of tie bars having pistons and coupled sections and dividing mold clamping force given to the dies between the pistons and the coupled sections;
• a plurality of cylinders for mold clamping equipped in one of the fixed die plate or the movable die plate, accommodating the pistons of a plurality of the tie bars respectively, and to which pressured operating fluid for generating the mold clamping force is supplied;
• a plurality of uniting units being equipped in another of the fixed die plate or the movable die plate and uniting releasably with a plurality of the tie bars respectively by meshing with coupled sections of a plurality of the tie bars respectively;
• a tie bar load distribution unit for deciding a distribution of loads divided by a plurality of the tie bars based on information concerning the dies;
• a control unit for controlling pressure of the operating fluid of a plurality of the cylinders for mold clamping independently to become the loads of the decided distribution;
• an injection sleeve coupled with a cavity defined by the pair of the dies via an inlet provided in one of the pair of the dies, and
• an injection plunger advancing in the injection sleeve and injecting and filling a molding materials to the cavity, wherein
• the fixed die plate is possible to hold one of the dies at a plurality of positions in a direction perpendicular to the opening or closing direction, and
• the movable die plate is possible to hold the other of the dies at a plurality of positions in a direction perpendicular to the opening or closing direction.

A mold clamping apparatus comprising:

• a fixed die plate fixed on a base and holding one of a pair of dies;
• a movable die plate holding the other of the pair of the dies and provided in a opening or closing direction on the base movably;
• a plurality of tie bars having pistons and coupled sections and dividing mold clamping force given to the dies between the pistons and the coupled sections;
• a plurality of cylinders for mold clamping, equipped in one of the fixed die plate or the movable die plate, accommodating the pistons of a plurality of the tie bars respectively, and to which pressured operating fluid for generating the mold clamping force is supplied;
• a plurality of uniting units being equipped in another of the fixed die plate or the movable die plate and uniting releasably with a plurality of the tie bars respectively by meshing with coupled sections of a plurality of the tie bars respectively;
• a tie bar load distribution unit for deciding a distribution of loads divided by a plurality of the tie bars based on information concerning the dies, and
• a control unit for controlling pressure of the operating fluid of a plurality of the cylinders for mold clamping independently to become the loads of the decided distribution, wherein
• the fixed die plate is possible to hold the one of a pair of the dies at a plurality of positions in a direction perpendicular to the opening or closing direction, and
• the movable die plate is possible to hold the other of the pair of the dies at a plurality of positions in a direction perpendicular to the opening or closing direction.