Provided is a molding machine including a mold opening/closing mechanism configured to move a movable platen to be attached with a movable mold to a stationary platen to be attached with a stationary mold, and a clamping mechanism to perform a clamping process, and is intended to suppress machine cost or ensure the mold opening/closing speed. The molding machine includes the mold opening/closing mechanism configured to move the movable platen to be attached with the movable mold to the stationary platen to be attached with the stationary mold, and the clamping mechanism configured to perform a clamping process. The mold opening/closing mechanism includes at least two ball screws, at least two electric motors that respectively drive the ball screws, and a ball screw nut into which each of the ball screws is inserted.

A mold clamping device includes a base, a stationary platen fixed to the base and supporting a stationary mold, a movable platen movable on the base and supporting a movable mold, and a mold clamping mechanism for clamping the movable mold against the stationary mold. Tie bars extend from the stationary platen completely through both the movable platen and the mold clamping mechanism. A shaft supporting plate is fixed to the ends of the tie bars and terminates at its lower end portion in two spaced-apart shoes that have flat bottom surfaces in direct sliding contact with the base. The flat bottom surface of each shoe has a larger area than the cross-sectional area of the shaft supporting plate situated vertically above the shoe.

A mold clamping device includes a base, a stationary platen, a movable platen, a mold clamping mechanism, a tie bar, and a half nut. This mold clamping device further includes a shaft supporting plate supporting a tip of the tie bar. This shaft supporting plate is fixed to the tip of the tie bar, and is mounted on the base so as to be freely movable.

A mould-closing unit for an injection moulding machine for processing plastics has a mould support which is movable relative to a stationary mould support (10). A mould-moving device is provided to move the movable mould support into and out of closure of an injection mould. At least one force transmission element is connected to the movable mould support and at its end remote from the movable mould support has a section (14a) which is assigned to the stationary mould support (10) and can be actuated for operative engagement. The stationary mould support (10) is assigned a locking device (15), which can be moved into interlocking operative connection with the actuatable section (14a) to apply a closing force during closure of the injection mould. According to the method, these elements are used to create a method for locking a force transmission element to a mould support of the injection moulding machine. The fact that the locking device (15) has floating clamping jaws (16) which can be moved into interlocking operative connection with the actuatable section (14a) during closure of the mould to lock the force transmission element and the stationary mould support (10) and at the same time are connected to at least one piston (18) of a piston-cylinder unit (17) for applying the closing force, means that a mould-closing unit is created in which the locking mechanism for locking the tie bars to the mould support is integrated in a common unit with the unit for applying the closing force.

A clamp assembly for an injection molding machine includes a clamp piston slidable within a housing among a clamping position, a mold break position, and a meshing position disposed axially intermediate the clamping and the mold break positions. A clamp chamber urges the clamp piston towards the clamping position when pressurized, and a return device urges the clamp piston from the clamping position to the meshing position when pressure in the clamp chamber is relieved. At least one mold break actuator is coupled to a mold break engagement surface disposed within the housing. The mold break actuator is adjustable to accommodate retraction of mold break surface when the clamp piston moves to the clamping position, and to forcefully push the mold break surface forward against the clamp piston when moving the clamp piston to the mold break position.

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 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 mold clamping device includes a base, a stationary platen, a movable platen, a mold clamping mechanism, a tie bar, and a half nut. This mold clamping device further includes a shaft supporting plate supporting a tip of the tie bar. This shaft supporting plate is fixed to the tip of the tie bar, and is mounted on the base so as to be freely movable.

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.