CLAMPING UNIT FOR A MOLDING MACHINE

Abstract

A clamping unit includes a fixed mold mounting plate and a movable mold mounting plate mounted movably relative to the fixed mold mounting plate along a longitudinal axis. The movable mold mounting plate and the fixed mold mounting plate are mounted on a frame, and the frame is arranged on a lateral frame-side plate side of the movable mold mounting plate and the fixed mold mounting plate. The fixed mold mounting plate is fixedly connected to the frame of the clamping unit in a first fastening area positioned on the frame-side plate side of the fixed mold clamping plate. The fixed mold clamping plate is connected to the frame of the clamping unit in a second fastening area positioned on a second side of the fixed mold clamping plate facing away from the frame-side plate side, by an actuator.

Claims

1. A clamping unit for a molding machine, comprising: a fixed mold clamping plate, and a movable mold clamping plate movably mounted relative to the fixed mold clamping plate along a longitudinal axis, wherein the movable mold clamping plate and the fixed mold clamping plate are mounted on a frame, and the frame is arranged on a lateral frame-side plate side of the movable mold mounting plate and the fixed mold mounting plate, wherein the fixed mold mounting plate is fixedly connected to the frame of the clamping unit in a first fastening area, which first fastening area is positioned on the frame-side plate side of the fixed mold clamping plate, and wherein the fixed mold clamping plate is connected to the frame of the clamping unit in a second fastening area, which is positioned on a second side of the fixed mold clamping plate facing away from the frame-side plate side, by at least one actuator.

2. The clamping unit according to claim 1, wherein the at least one actuator is designed as a hydraulic piston-cylinder unit and/or as a piezo actuator.

3. The clamping unit according to claim 1, wherein at least one recess, in particular a blind hole or a bore, is provided in the frame and/or the fixed mold clamping plate of the clamping unit in the second fastening area, which at least one recess is designed to accommodate the at least one actuator and/or as part of the at least one actuator, preferably as a cylinder of a piston-cylinder unit.

4. The clamping unit according to claim 1, wherein the fixed mold clamping plate is connected to the frame in the first fastening area by a screw connection and/or a material bonded connection.

5. The clamping unit according to claim 1, wherein the fixed mold clamping plate in the first fastening area and/or the frame, adjacent to the first fastening area, comprises at least one joint, preferably a flexure joint, which at least one joint allows the fixed mold clamping plate to tilt.

6. The clamping unit according to claim 1, wherein the first fastening area comprises at least two sub-regions, preferably wherein the at least two sub-regions of the first fastening area are positioned substantially horizontally to each other on the fixed mold clamping plate.

7. The clamping unit according to claim 1, wherein a plate parallelism of the fixed mold clamping plate and the movable mold clamping plate can be controlled or regulated by the at least one actuator.

8. The clamping unit according to claim 1, wherein a control or regulating device is provided which is designed to control or regulate the plate parallelism during the application of a clamping force to the clamping unit, preferably by controlling or regulating the at least one actuator.

9. The clamping unit according to claim 1, wherein the movable mold clamping plate is connected to a clamping force mechanism which is designed to build up a clamping force between the movable mold clamping plate and the fixed mold clamping plate.

10. The clamping unit according to claim 1, wherein the frame of the clamping unit is designed as a C-frame, to which the movable mold clamping plate is movably supported along the longitudinal axis by means of a guide.

11. The clamping unit according to claim 1, wherein the clamping unit is designed as a tie-bar-less clamping unit and/or a 2-platen clamping unit.

12. A molding machine, in particular injection molding machine, comprising at least one clamping unit according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Further details and advantages will be explained in more detail below with reference to the drawings, in which:

[0047] FIG. 1 shows a first embodiment of a clamping unit, and

[0048] FIG. 2 is a sectional view A-A indicated in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0049] FIGS. 1 and 2 show a first embodiment of a clamping unit 1.

[0050] FIG. 1 shows a top view of the clamping unit 1, and FIG. 2 shows a side view with the section A-A indicated in FIG. 1.

[0051] The clamping unit 1 comprises a two-part frame 4, which has a left and a right side panel 26.

[0052] The side panels 26 are connected to each other on one side by the fixed mold clamping plate 2 and on the other side by the bolted support plate 27. Furthermore, it may be provided that the clamping unit 1 comprises connecting bars which can connect the two side panels 26.

[0053] The clamping unit 1 has a fixed mold mounting plate 2 and a movable mold mounting plate 10 that is mounted so that it can be moved relative to the fixed mold mounting plate 2 along the longitudinal axis 9.

[0054] The movable mold clamping plate 10 is supported on the frame 4more precisely, on the side walls 26 of the frame 4 via the slide guides 12and can be moved along the longitudinal axis 9 by means of the rapid lifting device 19 via the drive plate 15 and the transmission body 14.

[0055] The rapid lifting device 19 comprises an electric drive unit 20, which is designed to perform an opening and/or closing movement of the movable mold clamping plate 10 by driving the spindle 22 of the spindle drive via the gearbox 21, whereby the recirculating ball nut 23 mounted on the spindle 22 can be moved linearly.

[0056] This ball screw nut 23 is in turn rigidly connected by a screw connection to the linkage bridge 24, which linkage bridge 24 in turn transmits the linear movement to the drive plate 15 via the linkage rods 25.

[0057] This rapid lifting device 19 allows a mold tool that can be arranged between the movable mold clamping plate 10 and the fixed mold clamping plate 2 to be opened and/or closed.

[0058] After a corresponding molding tool has been closed via the rapid lifting device 19, a clamping force can be exerted on the molding tool by means of the clamping force mechanism 11.

[0059] For this purpose, the pressure rod 16 connected to the drive plate 15 is connected to the piston 18 of the clamping force mechanism 11, which is designed as a piston-cylinder unit, by closing the split locking nut 17.

[0060] The piston 18 of the piston-cylinder unit 28 is mounted in a corresponding recess in the support plate 27, this recess forming the cylinder 18 of the piston-cylinder unit 28, whereby a corresponding pressure build-up of a hydraulic fluid between the support plate 27 and the piston 18 exerts a force via the pressure rod 16, the drive plate 15, the transmission body 14, and the movable mold clamping plate 10 onto a mold tool arranged between the movable mold clamping plate 10 and the fixed mold clamping plate 2 (the so-called clamping force).

[0061] Very high clamping forces cause deformation of the frame 4more precisely, the side walls 26 of the frame 4which leads to the C-shaped frame 4 gaping open and thus jeopardizes the parallelism of the movable mold clamping plate 10 to the fixed mold clamping plate 2.

[0062] However, in order to continue to provide plate parallelism between the movable mold clamping plate 10 and the fixed mold clamping plate 2, the movable mold clamping plate 10 is mounted in a tiltable manner via the transmission body 14.

[0063] In this embodiment, frame 4 is arranged on a lateral frame side plate side of the movable mold clamping plate 10 and the fixed mold clamping plate 2.

[0064] The fixed mold clamping plate 2 comprises a first fastening area 3 and a second fastening area 5.

[0065] The first fastening area 3 is positioned on the frame side of the fixed mold clamping plate.

[0066] The second fastening area 5 is positioned on a second side of the fixed mold clamping plate 2 facing away from the frame side of the plate.

[0067] Since the clamping unit 1 of this embodiment is designed as a horizontal clamping unit in a C-frame construction, the second fastening area 5 is arranged above the first fastening area 3.

[0068] In the first fastening area 3, the fixed mold clamping plate 2 is fixedly connected to the side walls 26 of the frame 4 by means of the screw connection 13.

[0069] In the second fastening area 5, the fixed mold clamping plate 2 is connected to the side walls 26 of the frame 4 via the actuator 6, whereby corresponding control or regulation of the actuator 6 enables the fixed mold clamping plate 2 to be tilted in order to control or regulate the parallelism of the fixed mold clamping plate 2 and the movable mold clamping plate 10.

[0070] In this embodiment, the actuator 6 is implemented as a hydraulic piston-cylinder unit 7.

[0071] The cylinder of the piston-cylinder unit 7 is represented by the fixed molding clamping plate 2 and a recess 8 in the plate itself, in which the piston of the piston-cylinder unit 7 is guided.

REFERENCE LIST

[0072] 1 Clamping unit [0073] 2 Fixed mold clamping plate [0074] 3 First fastening area [0075] 4 Clamping unit frame [0076] 5 Second fastening area [0077] 6 Actuator [0078] 7 Piston-cylinder unit [0079] 8 Recess [0080] 9 Longitudinal axis [0081] 10 Movable mold clamping plate [0082] 11 Clamping force mechanism [0083] 12 Sliding guide [0084] 13 Screw connection [0085] 14 Transmission body [0086] 15 Drive plate [0087] 16 Pressure rod [0088] 17 Split locking nut [0089] 18 Piston [0090] 19 Rapid lifting device [0091] 20 Electric drive unit [0092] 21 Gearbox [0093] 22 Spindle [0094] 23 Ball screw nut [0095] 24 Linkage bridge [0096] 25 Linkage rod [0097] 26 Side wall of the frame [0098] 27 Support plate [0099] 28 Piston-cylinder unit