In a mold clamping apparatus according to the present disclosure, a mold clamping mechanism is provided with a half nut, and a tie bar is provided with a circumferential groove to be meshed with the half nut. A forceful mold opening mechanism that opens molds at an initial stage of mold opening is provided across a movable platen and the mold clamping mechanism. The forceful mold opening mechanism is set so as to have greater axial force and shorter stroke than those of a mold opening and closing mechanism. A control unit controls opening and closing of the half nut, controls the forceful mold opening mechanism, and also controls the position of the half nut in such a way that the half nut is synchronized with the circumferential groove by the forceful mold opening mechanism.

In a mold clamping apparatus according to the present disclosure, a mold clamping mechanism is provided with a half nut, and a tie bar is provided with a circumferential groove to be meshed with the half nut. A forceful mold opening mechanism that opens molds at an initial stage of mold opening is provided across a movable platen and the mold clamping mechanism. The forceful mold opening mechanism is set so as to have greater axial force and shorter stroke than those of a mold opening and closing mechanism. A control unit controls opening and closing of the half nut, controls the forceful mold opening mechanism, and also controls the position of the half nut in such a way that the half nut is synchronized with the circumferential groove by the forceful mold opening mechanism.

A mold clamping device (20) includes a traction platen (29) disposed below a pressure-receiving platen (22), a movable platen (28) disposed above the pressure-receiving platen (22) and configured to be moved up and down by a mold opening and closing mechanism (27), and tie bars (31) extending downward from the movable platen (28) and penetrating the pressure-receiving platen (22) and the traction platen (29). The mold clamping device (20) is configured to clamp molds (12) disposed between the pressure-receiving platen (22) and the movable platen (28). A saw tooth portion (36) is formed at a lower end of each of the tie bars (31), and a half nut (26) that engages with the saw tooth portion (36) is provided under the traction platen (29).

A mold clamping device (20) includes a traction platen (29) disposed below a pressure-receiving platen (22), a movable platen (28) disposed above the pressure-receiving platen (22) and configured to be moved up and down by a mold opening and closing mechanism (27), and tie bars (31) extending downward from the movable platen (28) and penetrating the pressure-receiving platen (22) and the traction platen (29). The mold clamping device (20) is configured to clamp molds (12) disposed between the pressure-receiving platen (22) and the movable platen (28). A saw tooth portion (36) is formed at a lower end of each of the tie bars (31), and a half nut (26) that engages with the saw tooth portion (36) is provided under the traction platen (29).

A plastic injection molding machine and molding method related to an injection molding machine for stack molds, wherein the central portion of the mold remains fixed and it has two molding faces that act on the fixed central portion by means of a hydraulic chamber that produces the clamping force and prevents the deformations due to bending on the molding faces. Likewise, it relates to a molding method.

A plastic injection molding machine and molding method related to an injection molding machine for stack molds, wherein the central portion of the mold remains fixed and it has two molding faces that act on the fixed central portion by means of a hydraulic chamber that produces the clamping force and prevents the deformations due to bending on the molding faces. Likewise, it relates to a molding method.

A plastic injection molding machine and molding method related to an injection molding machine for stack molds, wherein the central portion of the mold remains fixed and it has two molding faces that act on the fixed central portion by means of a hydraulic chamber that produces the clamping force and prevents the deformations due to bending on the molding faces. Likewise, it relates to a molding method.

A plastic injection molding machine and molding method related to an injection molding machine for stack molds, wherein the central portion of the mold remains fixed and it has two molding faces that act on the fixed central portion by means of a hydraulic chamber that produces the clamping force and prevents the deformations due to bending on the molding faces. Likewise, it relates to a molding method.

According to an aspect of the present invention, there is provided a mechanism for opening, closing, and clamping a mold or die of an injection molding machine comprising: at least two sets of first toggle linkages opposed to each other; at least two sets of second toggle linkages hingedly connected to said first toggle linkages; at least 2 linear activating means for driving the mechanism towards a closed or open position hingedly connected to said second toggle linkages; a movable platen hingedly connected to first toggle linkages for holding an injection molding die, mold, or die casting die; and at least 2 sets of guide rods for the movable platen to slidingly move along its travel path.

The invention relates to a mold-closing unit for an injection molding machine for processing plastics, comprising a mold-moving device for moving the movable mold support into and out of closure of an injection mold. At least one force transmission element is connected to the movable mold support and at its end remote from the movable mold support has a section (14a) which is assigned to the stationary mold support. The stationary mold support (10) is assigned a locking device (15) having a plurality of locking elements (70) which can be moved into interlocking operative connection with the actuatable section (14a). The locking device (15) has at least one actuator (16) which is movable in the closing direction (s-s) and on which, during movement of the actuator, the locking elements (70) are movable transversely to the closing direction (s-s) along a sliding block guide (60) in and out of an interlocking operative connection with the actuatable section (14a). The actuator is at the same time connected to at least one piston (18) of a piston-cylinder unit (17) for applying the closing force.