CN118636413A - Two-platen clamping unit for molding machines - Google Patents

Abstract

The invention relates to a two-platen clamping unit for a molding machine, comprising a machine frame (10), one mold clamping plate (1) being fixedly arranged on the machine frame and the other mold clamping plate (2) being movably arranged relative to the machine frame along the longitudinal axis of the machine, the mold clamping plates (1, 2) having mold clamping surfaces lying opposite each other, and the clamping unit having exactly two tie rods (4, 5) for transmitting the clamping force between the fixed mold clamping plate and the movable mold clamping plate (1, 2), the two tie rods (4, 5) being at least approximately diagonally opposite each other, each tie rod (4, 5) being provided with a locking device (8) and a pressure pad (16), preferably the two locking devices (8) being directly located on the movable mold clamping plate (2) or the fixed mold clamping plate (1), and the other of the two mold clamping plates (1, 2) bearing two pressure pads (16). The invention also relates to a molding machine having such a clamping unit.

Description

Two-platen clamping unit for molding machines

Technical Field

The invention relates to a double-platen clamping unit for a molding machine having the features of the preamble of claim 1 and to a molding machine having such a double-platen clamping unit.

Background Art

DE 10 2006 017 026 B4 discloses a two-platen clamping unit having the features of the preamble of claim 1 and a molding machine in the form of an injection molding machine having such a two-platen clamping unit.

In paragraph [0008] of the above-mentioned patent, a two-bar clamping unit is considered, and the only specific disclosure is about a cylindrical protuberance of the mold clamping surface. No other specific features are disclosed, in particular, whether it is a two-platen clamping unit is not disclosed.

Summary of the invention

The object of the present invention is to improve a clamping unit of the generic type in such a way that the material requirement is reduced.

The object is achieved in a first aspect by a double-plate clamping unit for a molding machine, the double-plate clamping unit having a frame, a mold clamping plate fixedly arranged on the frame and the other mold clamping plate movably arranged relative to the frame along the longitudinal axis of the machine, the mold clamping plates having mold clamping surfaces opposite to each other, and the clamping unit having exactly two tie rods for transmitting the clamping force between the fixed mold clamping plate and the movable mold clamping plate, wherein the two tie rods are at least approximately diagonally opposite to each other with respect to an imaginary cross-section extending transversely to the longitudinal axis of the machine and parallel to the vertical line, each tie rod is provided with a locking device and a pressure pad, and at least one of the two locking devices is directly located on the movable mold clamping plate or the fixed mold clamping plate, and the other of the two mold clamping plates supports at least one of the pressure pads.

In the two-platen clamping unit according to the invention, the mold clamping plate with the mold clamping surface itself is designed to be flexurally rigid such that a pressure plate or a pressure frame as taught in DE 10 2006 017 026 B4 is not necessary.

At least one of the two locking devices is located directly on the movable mold clamping plate or the fixed mold clamping plate, and at least one of the two pressure pads is supported by the other of the two mold clamping plates. In DE 10 2006 017 026 B4, the two locking devices are located on the pressure plate or the pressure frame, or the two pressure pads are supported by the pressure plate or the pressure frame.

On the other hand, the object is achieved by a molding machine, in particular an injection molding machine, preferably a plastics injection molding machine, or a die casting machine, having such a clamping unit.

Advantageous embodiments of the invention are defined in the dependent claims.

In one embodiment, the two locking devices are located directly on the movable mold clamping plate or the fixed mold clamping plate, and the other of the two mold clamping plates carries the two pressure pads.

In one embodiment, at least one, preferably exactly one, rapid-stroke cylinder is provided for moving the movable mold clamping plate, which is arranged outside the mold clamping surface of the mold clamping plate. Preferably, the rapid-stroke cylinder is arranged only on one side of an imaginary cross section laid by the two tie rod axes of the tie rods, but alternatively, it is also possible to arrange it exactly in this cross section. The other side of the imaginary cross section thus remains free between the mold clamping plates. This has the advantage that the molded part does not have to be guided in the vertical direction with respect to the tie rods during removal by an automated device, the base of which is mounted on the mold clamping plate.

In this embodiment, a loading device which can be controlled by the control device can be provided, by which at least one cylinder rod of the rapid-stroke cylinder and/or at least one of the two tie rods can be loaded with a tensile force and/or a compressive force.

In one embodiment, it is provided that the mold clamping surface of at least one of the two mold clamping plates has a saddle-shaped protrusion, preferably a saddle-shaped mold clamping surface, which has a convex shape in the diagonal of the two tie rods when viewed from the side of the opposite mold clamping surface, and has a concave shape in the diagonal where no tie rods are installed.

In one embodiment, it is provided that at least one of the two mold clamping plates has at least one integrated pressure chamber for actively (adjustably) bulging the mold clamping surface.

In one embodiment, it is provided that the movable mold platen is arranged on a cantilever arm of the machine frame.

In a molding machine, in particular an injection molding machine, it can be provided that, in addition to the two hydraulically actuatable pressure pads, the molding machine has a plurality of further actuators, wherein, with the exception of the two pressure pads, all further actuators are electrically actuatable.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention are discussed with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a two-platen clamping unit.

FIG. 2 shows an embodiment of an injection molding machine.

FIG. 3 shows a cross-sectional view of FIG. 2 .

FIG. 4 shows a cross-sectional view of FIG. 3 .

FIG. 5 shows a top view of a fixed mold clamping plate of an exemplary embodiment of a two-platen clamping unit.

FIG. 6 shows a cross-sectional view of FIG. 5 .

FIG. 7 shows another cross-sectional view of FIG. 5 .

FIG. 8 shows a top view of a fixed mold clamping plate of an embodiment of a two-platen clamping unit.

9a and 9b show a top view and a cross-sectional view of a fixed mold clamping plate of an embodiment of a double-platen clamping unit.

10a and 10b show a top view and a cross-sectional view of a fixed mold clamping plate of an embodiment of a double-platen clamping unit.

FIG. 11 shows an embodiment of an injection molding machine.

FIG. 12 shows a cross-sectional view of FIG. 11 .

DETAILED DESCRIPTION

FIG. 1 shows a double-plate clamping unit for an injection molding machine, comprising a machine frame 10, on which a mold clamping plate 1 is fixedly arranged and another mold clamping plate 2 is movably arranged relative to the machine frame along the longitudinal axis of the machine via a guide rail 17, wherein the mold clamping plates 1, 2 have mold clamping surfaces that are opposite to each other, and the clamping unit has exactly two tie rods 4, 5 for transmitting the clamping force between the fixed mold clamping plate and the movable mold clamping plate 1, 2, which are diagonally opposite to each other with respect to an imaginary cross-section transverse to the longitudinal axis of the machine, wherein each tie rod 4, 5 is provided with a locking device 8 and a pressure pad 16, wherein the two locking devices 8 are directly located on the movable mold clamping plate 2, and the fixed mold clamping plate 1 supports the two pressure pads 16.

In the upper area of the two mold clamping plates 1, 2, there is exactly one quick-stroke cylinder (Eilgangzylinder) 6 for moving the movable mold clamping plate 2. The quick-stroke cylinder is arranged outside the mold clamping surface of the mold clamping plates 1, 2 relative to the two tie rods 4, 5 so that the quick-stroke cylinder and these tie rods form an imaginary triangle in an imaginary transverse plane transverse to the longitudinal axis of the machine (see also Figures 8 and 9).

An ejector 13 for the molded part is not shown in FIG. 1 (but see the embodiment of FIG. 2 ), which can be arranged on the movable mold clamping plate 2 .

In the exemplary embodiment of FIG2 , the pressure pad 16 is integrated into the fixed mold platen 1 and is therefore not visible. Otherwise, what has been said with respect to FIG1 applies.

Fig. 3 shows a section along the line H-H of Fig. 2. It can be seen that the two tie rods 4, 5 are arranged diagonally.

Fig. 4 shows a section along the line J-J of Fig. 3. It can be seen that two pressure pads 16 are integrated in the fixed mold clamping plate 1 and that the mold clamping surface is optionally convex.

In FIG. 5 , the bulge of the mold clamping surface of FIG. 4 is shown in more detail in conjunction with FIG. 6 and FIG. 7 . FIG. 6 shows a section along the line n–n of FIG. 5 , and FIG. 7 shows a section along the line m–m of FIG. 5 . Since the bulge is formed in the shape of a saddle surface, (A represents the center point of the plate; A _1-4 represent the corner points of the mold clamping plate, wherein A ₁ and A ₂ are located at the center points of the tie rods 4 and 5, respectively, and A ₃ and A ₄ are located at the plate edges, respectively; y _HM represents the rod spacing from axis to axis in the y direction; z _HM represents the rod spacing from axis to axis in the z direction; Δx' and Δx" represent the deformation corrections, respectively) for FIG. 6 the following applies:

A(x,y,z)＝A(0,0,0)

Or, for Figure 7:

A(x,y,z)＝A(0,0,0)

FIG8 shows an embodiment in which the cylinder rod of the rapid stroke cylinder 7 (at the lower right corner) can be loaded with tension and/or pressure by a loading device that can be controlled by means of a control device. This allows the force application point to be moved from the plate center point A in the n direction (F ₁ >F ₂ ) and in the m direction toward the resulting force application point A'. This is particularly important for asymmetrical cavities, as shown in FIG8 , but its importance also depends on the mold rigidity and cavity design. Likewise, the hot runner nozzle control can be optimally coordinated during injection and clamping force buildup (taking into account venting and embossing). Active parallelism adjustment or inclination adjustment can be performed during clamping force buildup.

9a and 9b (section along line n-n of FIG. 9a) or FIG. 10a and 10b (section along line m-m of FIG. 10a) show pressure chambers 14, 15 integrated into the mold platen. The adjustability is achieved by the pressure chambers 14, 15 being loadable with hydraulic oil in an adjustable manner by means of a control device.

FIG. 11 shows a view of a further embodiment of an injection molding machine, in which a rapid-stroke cylinder 6 , 7 is provided in each case at the top and bottom.

FIG. 12 shows a cross section along line H-H of FIG. 11 .

Reference numerals

1 Fixed mold clamping plate

2 Movable mold clamping plate

3 Injection unit

4 Tie rod

5 Tie rod

6 Upper rapid stroke cylinder

7 Lower rapid stroke cylinder

8 Locking device

9 Cantilever

10 racks

11. Mould

12 Mould

13 Ejector

14 Pressure chamber

15 Pressure chamber

16 Pressure Pads

17 Guide Rail

Δx', Δx" deformation correction

y _HM Bar spacing in the y direction (axis to axis)

z _HM Bar spacing in z direction (axis to axis)

A Plate center point

A _1-4 Corner point of mold clamping plate or center point of tie rod

F ₁ rod - pressure pad force point 1

F ₂ rod - pressure pad force point 2

F ₃ fast stroke cylinder - pressure pad force point 3

n _F1 rod to the center point A of the plate force distance 1

n _F2 rod to plate center point A force distance 2

m _Fi force distance from the rod to the center point A of the plate i

A' Synthetic force application point

Δm Displacement (shift) of the force application point A→A', m-axis

Δn: displacement of the force application point A→A', n-axis

Claims (9)

1. A double-plate clamping unit for a molding machine, having a machine frame (10) on which a mold clamping plate (1) is fixedly arranged and to which the other mold clamping plate (2) is movably arranged along a machine longitudinal axis, wherein the mold clamping plates (1, 2) have mutually opposite mold clamping surfaces, and having exactly two tie rods (4, 5) for transmitting clamping forces between the fixed mold clamping plate and the movable mold clamping plate (1, 2), the two tie rods (4, 5) being arranged at least approximately diagonally opposite each other with respect to an imaginary cross section extending transversely to the machine longitudinal axis and parallel to the vertical, each tie rod (4, 5) being provided with a locking device (8) and a pressure pad (16), characterized in that at least one of the two locking devices (8) is located directly on the movable mold clamping plate (2) or the fixed mold clamping plate (1), and the other of the two mold clamping plates (1, 2) supports at least one of the two pressure pads (16).

2. The two-plate clamping unit according to the preceding claim, wherein the two locking devices (8) are located directly on the movable mold clamping plate (2) or the fixed mold clamping plate (1), and the other mold clamping plate of the two mold clamping plates (1, 2) supports two pressure pads (16).

3. Double plate clamping unit according to one of the two preceding claims, wherein at least one, preferably exactly one, quick travel cylinder (6, 7) is provided for moving the movable mold clamping plate (2), which quick travel cylinder is arranged outside the mold clamping surface of the mold clamping plate (1, 2).

4. Double plate clamping unit according to the preceding claim, wherein a loading device is provided which can be actuated by a control device, by means of which at least one cylinder rod of the quick-stroke cylinder (6, 7) and/or at least one tie rod of the two tie rods (4, 5) can be loaded with tension and/or pressure.

5. The two-plate clamping unit according to at least one of the preceding claims, wherein the clamping face of at least one of the two clamping plates (1, 2) has a saddle-face-shaped bulge, preferably a saddle-face-shaped clamping face, which, viewed from the side of the opposite clamping face, has a convex shape in the diagonal of the two tie bars and a concave shape in the diagonal of the no tie bars mounted.

6. The two-plate clamping unit according to at least one of the preceding claims, wherein at least one of the two mold clamping plates (1, 2) has at least one integrated pressure chamber (14, 15) for adjustable raised mold clamping surfaces.

7. Double plate clamping unit according to at least one of the preceding claims, wherein the movable mold clamping plate (2) is arranged on a cantilever arm (9) of a frame (10).

8. Molding machine, in particular injection molding machine or die casting machine, with a double plate clamping unit according to at least one of the preceding claims.

9. The molding machine according to the preceding claim, wherein the molding machine has a plurality of further actuators in addition to the two pressure pads (16) which can be hydraulically actuated, wherein all further actuators are electrically actuated in addition to the two pressure pads (16).