KR20070049161A - Divider Driver for Injection Molding Die - Google Patents

Abstract

The present invention relates to a drive for an index plate 8 of an injection molding die for an injection molding machine, in particular a multielement or multicolor injection molding machine. A feature of the invention is that the supply shaft 22 includes at least one second front part connected to the divider 8, the rotary shaft including at least one first rear part as the drive part 21. A channel 24, 25, 38 for supplying a liquid medium or a gaseous medium to the divider and / or for lead-through of an electrical line or an optical fiber line in the second whole. ) Is placed. The two parts are preferably connected to each other by a detachable coupling 16. By separating the rotary driver function and the media supply function, the diameter of the supply portion can be adjusted to the individual conditions. On the other hand, the drive unit may be specifically designed to implement an optimal driving force.

Description

DRIVE FOR AN INDEX PLATE OF AN INJECTION MOLDING TOOL}

The present invention relates to an index plate driver of an injection molding die for an injection molding machine, in particular a multielement or multicolor injection molding machine, and an injection molding machine equipped with such a driver.

Various methods are known for producing multielement or multicolor injection molded articles. In the so-called divider method, the injection molding die is deformed in such a way that an additional third plate, the so-called divider, is arranged between the two basic dies. The divider plate can rotate about a central axis and move in the axial direction, ie in the longitudinal direction of the machine. The divider forms a central portion of the cavity in which a pre-mold part is formed, which can be maintained undeformed therein. When the fixed die portion is lifted, the divider rotates 180 ° and the preform is moved into the second cavity, in which the second component can be molded.

Different variants of injection molding machines with dividers from DE 101 45 461 A1 are known.

In the variant described in FIGS. 1 to 5 of DE 101 45 461 A1, a rotating unit formed as a housing is fixed on a movable die backing plate, and a pinion is rotatably mounted inside the housing. . The pinion is formed in such a way that the interior is empty and has a multiple-groove profile. The rotating shaft of the divider has a multi-groove profile that engages the pinion and penetrates the pinion. The die-side end of the rotating shaft is connected to the divider and the opposite end is connected to a linear drive (e.g. hydraulic cylinder) so that the divider escapes from or is divided into the die, which is fixed. Plates can be inserted. At right angles to the machine longitudinal axis, a rack is arranged in the housing of the rotating unit, the rack meshes with the pinion and can be moved back and forth by the hydraulic cylinder. In this way the pinion can rotate clockwise and counterclockwise by an angle corresponding to the stroke of the rack.

In the variant described in FIGS. 6 to 11 of DE 101 45 461 A1, a hydro motor or electric motor is provided for the rotational movement of the divider, the hydro motor or the motor being behind the movable die. A hollow shaft embedded in the recess of the dam plate and having a multiple groove profile corresponding to the multiple groove profile of the rotating shaft of the divider. 1 to 5, a separate rotary device with a rack-pinion driver can be omitted between the injection molding die and the back damper. In addition, the motor has the advantage that the rotating shaft of the divider can rotate in any arbitrary direction and can be fixed at every angular position. In particular, unlike rack-pinion drivers, the divider can continue to rotate in one direction as needed.

Known dividers have the disadvantage that the diameter of the rotating shaft should not be too large for driving technical reasons. This makes it difficult for tempering media, electrical supply lines and the like to be guided through the rotating shaft to the divider. Another disadvantage is that the rotary shaft has a multi-groove profile, since only a part of the outer surface of the rotary shaft, i. Is that the bearing is exposed to relatively high loads. This is particularly disadvantageous when the divider is heavy.

Accordingly, an object of the present invention is to provide a partition plate for an injection molding machine, which has a higher degree of freedom in supplying a medium of the partition plate and is not significantly constrained with respect to the weight of the partition plate. The present invention also provides an injection molding machine that can be driven sufficiently with standard die backing plates and that can be used alternately for split plate operation (multi-component injection molding to multi-color injection molding) and non-dividing plate operation without further modification. It aims to do it.

The first mentioned object is achieved through a driver having the features of claim 1. The second mentioned object is achieved through an injection molding machine with the features of claim 9. Preferred embodiments and refinements are set forth in the dependent claims.

By forming the rotary shaft in several parts, including at least one rear portion as a driving portion, and including at least one whole fixed to the divider as a supply portion, the rotary drive function and the medium supply function of the divider plate can be separated from each other. In particular, since the diameter of the supply portion can be matched for each condition, there is virtually no limitation when supplying a tempering medium such as cooling water or oil or compressed air to the partition plate, and in some cases, a sensor present in the partition plate. Electrical lines for their electrical signal may also be provided. In contrast, the drive can be designed in particular so that an optimum drive force can be achieved, ie the diameter of the drive is much smaller than the diameter of the feed.

As the connection of the drive and supply is preferably via a detachable coupling, the divider including the supply can be separated from the injection molding machine and driven using different die techniques in a single element injection molding process or in a multi element injection molding process. Whereas, the drive, including the rotary driver and the linear driver, may remain in the injection molding machine. The divider can be simply reassembled with the supply so that it can be replaced again for multi-element injection molding or multi-color injection molding. Since the remaining parts for driving the divider are still mounted in the injection molding machine, the supply and the drive need only be coupled to each other so that the injection molding machine can be moved back to the multielement mode or the multicolor mode without significant time loss.

When the rotary drive for the drive unit is fixed to the support plate of the ejection plate, the drive unit is guided through the discharge plate and the support plate, and a very simple structure is realized when protruding backward over the support plate. In this case, the rotary driver is immovably fixed to the support plate, the drive unit has a multi groove profile, and the multi groove profile matches the multi groove profile of the hollow shaft when engaged with the hollow shaft which can be driven by the rotary driver. do.

Alternatively, a rotary driver may be fixed to the discharge plate itself to follow the discharge plate. In this case, a belt pulley or pinion driven by the rotary driver may be fixed to the drive unit.

Another advantage is that the feed has a smooth cylindrical surface and can be reliably mounted in a mating sliding bush formed in the die backing plate. In this case, as opposed to the small support surface of the rotating shaft with a multi-groove profile, the entire surface can be used for bearing support.

Hereinafter, the present invention will be described in more detail with reference to Examples and drawings.

1 is a side view of a part of an injection molding machine, a partial cross-sectional view showing a state in which a divider is inserted.

FIG. 2 is a cross-sectional view similar to FIG. 1 but showing a state in which the divider is discharged. FIG.

3 is a plan view showing the injection molding machine viewed in the direction of the arrow A of FIGS. 1 and 2.

As can be seen in FIGS. 1 to 1, a multi-element injection molding process using a divider to the injection molding die for a multicolor injection molding process on a die backing plate 1 of an injection molding machine which is already known (detailed description is omitted). The die half 2 is fixed with a centering ring 3 interposed therebetween. In addition to "classical" multi-component injection molding, the laminated construction of injection molded parts using the same plastic can also be regarded as multi-component injection molding. Standard die backing plates with drilling templates according to EUROMAP (European Plastics and Rubber Manufacturers' Association) can be used. The die half 2 consists of a mold plate with a base plate 4, a support bar 5 and a recess 7 for the divider plate 8. In addition, discharge pins 9 are provided which can be fixed by core pullers. Pin 10 is inserted only into corresponding bores in divider 8 and is rarely used as discharge pin. In addition, sliding bushes 11 are provided in the die backing plate 1 and in the base plate 4 and the mold plate 6, which may be provided separately or jointly depending on the application. have. Behind the die back damping plate 1, the discharge plate 12 with the guide bush 13 moves on the guide bolt 14 in the longitudinal direction of the machine between the support plate 15 and the die back damping plate 1. The supporting plate 15 is fixed to the tool back damping plate 1 by a screw guided through the guide bolt 14. Two hydraulic cylinders 17, 18 (see FIG. 3) lying in the same plane to the left and right of the central axis allow the discharge plate 12 to move toward or away from the die back damper 1. Can be.

The divider plate 8 is connected to a rotating shaft extending through the die half 2, the die backing plate 1, the discharge plate 12, the support plate 15, and the hollow shaft 19 of the rotary driver 20, A portion of the rotating shaft projects rearward from the hollow shaft 19. The rotary driver 20 may be formed as an electric motor with a suitable transmission, for example a servo driver or may be formed as a hydro motor. The rotating shaft comprises a rear drive 21, which is formed as a drive shaft with a multi-groove profile, ie a so-called spline shaft, to engage the multi-groove profile of the hollow shaft 19. In some cases, the drive shaft may be designed to have a single groove profile, in which case the hollow shaft 19 is provided with a corresponding rack. The driving part 21 extends through the support plate 15 and the discharge plate 12. On the right side of the discharge plate 12, the drive unit 21 and the supply unit 22 are connected to each other via a detachable coupling 16. The driving part 21 is fixed in the discharge plate 12 in the axial direction but is mounted to be rotatable. At the end of the feed 22 facing away from the divider 8, a rotary feedthrough 23 with a plurality of annular ring grooves 26 is provided, inside the rotary feedthrough. The channel for supplying media of the divider passes through. In this embodiment two channels 24, 25 are shown, for example for a coolant or generally for a tempering medium (water or oil). Compressed air can also be directed to the divider 8 through the channels of the feed. In some cases, the wires may also be guided to the divider 8 via a channel 38 extending through the drive 21 and the supply 22, for example. The wires can be discharged out of the channel 38 via the outlet 39 at the rear end of the drive 21 and / or via the side outlet 40, in which case the latter cannot be rotated continuously. Do. In some cases, an optical fiber line may be installed through the channel 38 instead of or in addition to the electric cable. The rotary feedthrough 23 is in this embodiment fixed to the supply 22 by means of a retaining ring 29 and at least one transverse bar 36 fixed to the discharge plate 12, for example to the discharge plate 12. Can not be rotated. The horizontal bar 36 may also be fixed to the die backing plate 1. Seal rings 27 and 28 are provided for hermetic connection to the supply.

The torque transmission between the drive shaft 21 and the supply 22 can be made, for example, via a groove-spring connection of the drive 21 and the supply 22. The coupling housing 16 consists of two half shells 32, 33 which engage in an annular groove of the supply part 22 in the engaged state and secure the head of the drive part 21 back. The two half shells 32 and 33 are fixed to each other using screws 34 and 35 and to the discharge plate 12 using additional screws (shown in dashed lines in the figure). In this way, the drive part 21 and the supply part 22 are rotatably connected to each other, and both parts can move axially with the discharge plate 12 via half shells 32, 33 engaged in an annular groove. Connected without.

1 shows a state in which the divider 8 is in a back moved position. The preform can now be produced in a first cavity, such as a lower cavity, once the injection molding die is closed. The injection molding die is then opened. The divider plate 8 is now withdrawn from the recess 7 as the discharge plate 12 is moved over the die backing plate 1 by the hydraulic cylinders 17 and 18 (see FIG. 2). The operation of the rotary driver 20 allows the divider 8 to rotate by the required angle and back into the recess 7. For this purpose, pressure means are applied to the hydraulic cylinders 17, 18 in opposite directions, and the discharge plate 12 is pulled backwards. When the injection molding die is closed again, the preform with the addition of other elements or colors can now be molded in the upper cavity. When the injection molding die is opened again, the finished injection molding can be discharged using the discharge pin 9.

* Drawing code list *

1: die backing plate

2: die half

3: centering ring

4: base plate

5: support bar

6: mold plate

7: recess

8: divider

9: discharge pin

10: Pin without ejection

11: sliding bush

12: discharge plate

13: guide bush

14: guide bolt

15: support plate

16: coupling housing

17, 18: hydraulic cylinder

19: hollow shaft with multiple groove profiles

20: rotary drive

21: drive part or spline shaft

22: supply

23: rotary feedthrough

24, 25: channel

26: Illusion Groove

27, 28: seal ring

29: retaining ring

32: first half shell

33: second half shell

34, 35: set screws for interlocking half shells

36: horizontal bar

37: Media connection (water, oil, air)

38: cable channel

39: first electric wire outlet

40: second electric wire outlet

Claims (15)

In a drive for an index plate of an injection molding die, in particular for injection molding machines, in particular for multi-element or multi-color injection molding machines, with a rotary shaft capable of rotary drive and linear drive, The rotary shaft includes at least one first rear part as drive part 21, and includes at least one second front part connected with the divider 8 as supply part 22, In the second all, channels 24, 25, 38 are arranged for supplying liquid or gaseous media to the divider and / or for lead-through of wires or optical fiber lines. Made, Actuator of divider plate for injection molding machine. The method of claim 1, The drive part 21 has a groove profile, in particular a single groove profile or a multiple groove profile, the groove profile meshes with a hollow shaft 19 capable of rotational drive, with a groove profile matched therewith, the hollow shaft 19 It is characterized in that the rotary drive 20 is provided fixed in place for, Actuator of divider plate for injection molding machine. The method of claim 1, The drive 21 is driven by a rotary drive that can move together in the axial direction, for example by a belt drive and a belt pulley fixed to the drive or on a gear motor and a gear wheel fixed to the drive. It is driven by, Actuator of divider plate for injection molding machine. The method according to any one of claims 1 to 3, The drive part 21 and the supply part 22 are characterized in that they are connected to each other via a detachable coupling 16, in particular a coupling consisting of several parts, Actuator of divider plate for injection molding machine. The method according to any one of claims 1 to 4, A section of the feed 22 is provided with a rotary feedthrough 23, which extends within the feed 22 for media such as oil, water and / or air, for example. Characterized in that channels 24, 25 are formed from the surface of the feed 22 and pass into the associated annular groove 26 of the rotary feedthrough 23, Actuator of divider plate for injection molding machine. The method according to any one of claims 1 to 4, The supply part 22 has a front face at the end facing the drive part, in particular in the region of the coupling 16, and extends in the supply part 22, for example a medium such as oil, water and / or air. Characterized in that the tubes for the medium can be connected therewith as channels 24, 25 for which are formed from the surface of the front face, Actuator of divider plate for injection molding machine. The method according to any one of claims 1 to 6, Characterized in that the diameter of the supply unit 22 is larger than the diameter of the drive unit 21, Actuator of divider plate for injection molding machine. The method according to any one of claims 1 to 7, Characterized in that a channel 38 for electric wires and / or optical fiber lines is provided, which penetrates the drive part 21 and the supply part 22. Actuator of divider plate for injection molding machine. An injection molding machine having a divider and a driver according to any one of claims 1 to 8, The rotary shaft, in particular the drive unit 21 is characterized in that it is fixed in the axial direction to the ejection plate (12) of the injection molding machine, but is mounted to be rotatable, Injection molding machine. The method of claim 9, The rotary shaft, in particular the drive 21, is guided through a recess formed in the discharge plate 12, as a result of which the rotary shaft projects beyond the discharge plate 12 and projects backwards. 19, characterized in that the rotary driver 20 is arranged behind the discharge plate 12, Injection molding machine. The method of claim 10, A fixed support plate 15 is provided with drive means 17, 18 for the discharge plate 12, wherein the rotating shaft, in particular the drive 21, is provided with the discharge plate 12 and the support plate 15. Is guided through the recess, and as a result the rotary shaft projects beyond the support plate 15 and is provided with a rotary driver 20 for the hollow shaft 19 to the support plate 12. Characterized by Injection molding machine. The method according to any one of claims 9 to 11, The coupling 16 of the drive part 21 and the supply part 22 is provided in the side surface of the said discharge plate 12 which faces away from the said support plate 15, The said coupling 16 is the said discharge plate Characterized in that it comprises a housing (32, 33) fixed to (12), Injection molding machine. The method according to any one of claims 9 to 12, The rotary feed-through 23 for the supply part 22 of the discharge plate 12, located on the side facing away from the support plate 15, is not rotatable relative to the discharge plate 12. , Injection molding machine. The method according to any one of claims 9 to 13, A bore is provided in the die backing plate assigned to the divider 8 with a sliding bush 11 for the supply part 22 of the driver for the divider 8. Injection molding machine. The method according to any one of claims 9 to 14, A standard die backing plate is provided with a drilling template in accordance with the EUROMAP (European Plastics and Rubber Manufacturers' Association), Injection molding machine.

Images