DE102013014617B4 - Vertical two-platen clamping unit, injection molding machine and process for producing hybrid injection molded parts - Google Patents

Abstract

Vertical two-platen clamping unit (1) for an injection molding machine, with a. a stationary base plate (2), b. a vertically movable relative to the base plate movable plate (3) and c. at least one turntable (14) which can be arranged between the base plate (2) and the movable plate (3), characterized in that between the base plate (2) and turntable (14) at least one sliding table (13) is arranged so that the turntable (14 ) From the area between the base plate (2) and movable plate (3) on and ausbringbar.

Description

The present invention relates to a closing unit for a vertical injection molding machine having the features of the preamble of claim 1, an injection molding machine having such a closing unit, and a method for producing hybrid injection molded parts using such an injection molding machine.

Generic closing units go for example from the EP 0 629 487 A1 or the DE 41 01 106 A1 out. In these documents closing units of a vertical injection molding machine are disclosed, which have a turntable. Through this turntables mold halves of an injection mold can be rotated. This allows the production of two-component injection molded parts.

It is becoming increasingly important to produce hybrid injection molded parts cost-effectively in large quantities. Such hybrid injection molded parts have, in addition to a two-component or multi-component injection-molded part, a fabric carrier which, for example, improves the elasticity or similar properties of the hybrid injection-molded part.

Although closing units, such as those disclosed in the abovementioned publications, can be used for producing such hybrid injection-molded parts. However, this has the disadvantage that some preparatory or intermediate steps, which are not related to the injection molding, must be performed in the area between the platens. Because of the lack of space prevailing there, this does not place requirements on handling devices that have to be underestimated that have to be dealt with in such work steps. On the one hand, this leads to an increase in the cost of the production process and, on the other hand, to a slowdown in it.

Other closing units that allow either a rotation or a displacement of a tool part, are from the DE 2424782 A1 , of the DE 693 01 584 T2 , of the US 6,019,929 A as well as the US 2001/0038866 A1 known. However, the problem addressed is neither recognized nor solved in these documents. In particular, they are not involved in the production of hybrid injection molded parts.

The object of the present invention is to remedy the disadvantages discussed.

This object is achieved by a vertical two-plate clamping unit having the features of claim 1, a vertical injection molding machine with such a closing unit and a method using such a vertical injection molding machine.

This is done by a sliding table is arranged between the lower platen, here and hereinafter referred to as base plate, and the turntable through which the turntable optionally together with a mold half from the area between the base plate and the upper platen, here and below called movable plate - and ausbringbar is.

Vertical clamping units according to the invention can also be used, for example, in transfer molding presses. However, not generic are horizontal injection molding machines, as for example from the DE 36 37 166 A1 emerge. Although these also have both a rotary and a sliding table. However, these serve a completely different purpose and therefore can not be considered a solution to the problem outlined.

Further advantageous embodiments of the invention are defined in the dependent claims.

It can be provided that the sliding table is mounted on a force accumulator, so that when the turntable is introduced into the region between the base plate and the movable plate, the sliding table is spaced from the base plate. During the subsequent closing of the closing unit, the sliding table is set down on the base plate. This can be done actively, for example by changing a pressure in a hydraulic cylinder, or passively, for example by pressure of the movable plate on the sliding table mounted with a spring element. If, for example, after an injection molding operation, the closing unit is then opened again, the energy storage device lifts the sliding table again from the base plate. This is useful for a low-friction linear movement of the sliding table.

The energy accumulator can be designed as a hydraulic or magnetic piston-cylinder unit or as a spring - in particular a leaf spring - or as an air cushion. In this case, the air cushion is preferably produced by introducing compressed air into a gap between the base plate and the sliding table through a multiplicity of nozzles. The pressure is typically a maximum of 10 bar. Furthermore, it may be advantageous by a rubber apron to prevent the escape of compressed air from the gap at least partially.

Also preferred is an embodiment in which the turntable and / or the sliding table have a tooth profile and these (this) rotatable or displaceable by interaction with driven by drive units gears are (are). These drive units can be operated approximately electrically, electromagnetically, pneumatically or hydraulically. This solution can be carried out particularly easily tolerant to the above-described lifting and lowering movements of the sliding table. But other designs, such as the use of a ball screw or cylinders, are conceivable without further notice.

Particularly preferred is an embodiment in which two turntables are provided, which are alternately on two sliding tables in the area between base plate and movable plate and be brought out. Downtimes of the injection molding machine, which are due to other necessary work steps, can thus be shortened, and so the production time of a hybrid injection molded part can be further reduced. Of course, embodiments are conceivable that have only a sliding table for two turntables or more than two turntables with a corresponding number of sliding tables.

In a further embodiment of the invention, spars are provided which pass through the base plate and the movable plate and which are guided both in the base plate and in the movable plate and are movable relative thereto. There may be provided pressure cushions through which the spars can be set to build a closing force under tension. In this case, the pressure in the pressure pad can be generated approximately hydraulically, electrohydraulically and / or electromagnetically.

To guide the spars in the base plate and / or the movable plate sockets can be arranged on the plates.

Furthermore, a locking device for locking the spars with the movable plate may be provided on the closing unit, wherein the lock is preferably form-fitting. This locking device can be designed as an electrical, electromagnetic or hydraulic locking device.

Particularly preferred is an embodiment in which the at least one turntable is designed as a mold carrier for a mold half of an injection mold and / or as an index plate.

The closing unit may be formed frame-free.

In a further embodiment of the invention can be provided for moving the movable plate in the vertical direction - preferably electromechanical or hydraulic - Eilhubvorrichtung.

Preferably, the movable plate is supported only on the Eilhubvorrichtung on the base plate or on the ground.

Protection is also desired for an injection molding machine having at least one plasticizing unit for at least one injection molding component, at least one injection unit for injecting the plasticized at least one injection molding component into a mold and at least one vertical two-platen clamping unit according to the invention.

• – außerhalb des Bereichs zwischen Basisplatte und verfahrbarer Platte vorbereitende Arbeitsschritte an oder in Formnestern einer Formhälfte durchgeführt werden,
• – die Formhälfte durch den Schiebetisch in den Bereich zwischen Basisplatte und verfahrbarer Platte eingebracht wird,
• – in einem ersten Spritzgießschritt ein Teil des Hybridspritzgussteils spritzgegossen wird,
• – die Formhälfte durch den Drehtisch gedreht wird,
• – in einem zweiten Spritzgießschritt ein weiterer Teil des Hybridspritzgussteils spritzgegossen wird und,
• – die Formhälfte durch den Schiebetisch aus dem Bereich zwischen Basisplatte und verfahrbarer Platte ausgebracht wird.

Furthermore, protection is desired for a method for producing hybrid injection molded parts, wherein

• - preparatory work steps are carried out on or in mold cavities of a mold half outside the area between the base plate and the movable plate,
• The mold half is introduced through the sliding table into the area between the base plate and the movable plate,
• In a first injection molding step, a part of the hybrid injection molded part is injection-molded,
• - The mold half is rotated by the turntable,
• In a second injection molding step, a further part of the hybrid injection molded part is injection-molded and
• - The mold half is discharged through the sliding table from the area between the base plate and movable plate.

In a preparatory step, it may be the introduction of fiber reinforced mats or heating them.

• – während sich eine Formhälfte in dem Bereich zwischen Basisplatte und verfahrbarer Platte befindet vorbereitende Arbeitsschritte an oder in Formnestern einer weiteren Formhälfte durchgeführt werden,
• – nachdem die eine Formhälfte aus dem Bereich zwischen Basisplatte und verfahrbarer Platte ausgebracht wird, die weitere Formhälfte durch einen Schiebetisch in den Bereich zwischen Basisplatte und verfahrbarer Platte eingebracht wird,
• – in einem dritten Spritzgießschritt ein Teil eines zweiten Hybridspritzgussteils spritzgegossen wird,
• – die weitere Formhälfte durch einen Drehtisch gedreht wird,
• – in einem vierten Spritzgießschritt ein weiterer Teil des zweiten Hybridspritzgussteils spritzgegossen wird und,
• – die weitere Formhälfte durch einen Schiebetisch aus dem Bereich zwischen Basisplatte und verfahrbarer Platte ausgebracht wird.

In a further embodiment of the method it can be provided that

• - While a mold half in the area between the base plate and movable plate preparatory operations are performed on or in mold cavities of another mold half,
• After the one half of the mold has been ejected from the area between the base plate and the movable plate, the further half of the mold is introduced through a sliding table into the area between the base plate and the movable plate,
• In a third injection molding step, a part of a second hybrid injection molded part is injection-molded,
• - The other half of the mold is rotated by a turntable,
• In a fourth injection molding step, a further part of the second hybrid injection molded part is injection-molded and
• - The further mold half is discharged through a sliding table from the area between the base plate and movable plate.

Of course, in so-called RTM processes, in which thermosetting plastics are processed, similar process steps can be used to increase productivity.

Show it:

1 a perspective view of a vertical two-plate clamping unit according to the invention with laterally arranged injection unit and a combination of turntable and sliding table,

2a a schematic side view of the clamping unit, wherein the turntable is applied from the area between the base plate and movable plate,

2 B a schematic side view of the closing unit in the open state, wherein the turntable is inserted in the region between the base plate and movable plate,

2c a schematic side view of the closed closing unit and

3 a schematic plan view of an injection molding machine with two turntable sliding table combinations.

1 shows a perspective view of the injection molding machine 7 , The plasticizing unit can be seen 10 , the injection unit 12 and the clamping unit 1 , The closing unit 1 has a sliding table 13 and a turntable mounted thereon 14 on. Furthermore, the stationary base plate 2 , the movable plate 3 and the spars 4 to recognize. In addition, the Eilhubvorrichtung 9 shown the rapid lifting of the movable plate 3 serves. The locking device 5 for locking the spars 4 with the moving plate 3 is also visible. Furthermore, there are pressure pads 6 to recognize, by which the closing force of the closing unit 1 can be built.

2 shows a schematic side view of the clamping unit 1 where (a) the turntable 14 from the area between base plate 2 and moveable plate 3 is deployed and the clamping unit 1 is open, (b) the turntable 14 in the area between base plate 2 and movable plate 3 is introduced and the clamping unit 1 is open, (c) the turntable 14 in the area between base plate 2 and movable plate 3 is introduced and the clamping unit 1 closed is. To recognize each are the base plate 2 and the movable plate 3 as well as the spars 4 and the jacks 8th on the plates for the spars 4 , The movements of the turntable 14 and the sliding table 13 be about the drive units 15 driven. The roles 16 are sprung stored, the energy storage is thus designed as a spring.

A schematic plan view of an injection molding machine 7 with injection unit 12 , Plasticizing unit 10 and closing unit 1 is in 3 to see. The embodiment of the invention shown here has two turntables each 14 and two sliding tables 13 on. This can be done on a turntable 14 injection-molding operations are performed while the other turntable 14 in the clamping unit 1 located.

LIST OF REFERENCE NUMBERS

1

closing unit

2

baseplate

3

plate

4

Holme

5

locking device

6

caul

7

injection molding machine

8th

sockets

9

Eilhubvorrichtung

10

plasticizing

12

injection assembly

13

sliding table

14

turntable

15

drive units

16

roll

Claims (21)

Vertical two-plate clamping unit ( 1 ) for an injection molding machine, with a. a stationary base plate ( 2 b. a vertically movable relative to the base plate movable plate ( 3 ) and c. at least one turntable ( 14 ) between the base plate ( 2 ) and movable plate ( 3 ) can be arranged, characterized in that between base plate ( 2 ) and turntable ( 14 ) at least one sliding table ( 13 ) is arranged so that the turntable ( 14 ) from the area between base plate ( 2 ) and movable plate ( 3 ) is on and ausbringbar. Vertical two-plate clamping unit according to claim 1, wherein the sliding table ( 13 ) is mounted on a power storage, so that the sliding table ( 13 ) from the base plate ( 2 ) spaced in the area between the base plate ( 2 ) and movable plate ( 3 ) can be moved in and out and the sliding table ( 13 ) on the base plate ( 2 ) is deductible. Two-plate clamping unit according to claim 2, wherein the energy accumulator is designed as a hydraulic or magnetic piston-cylinder unit, as a spring - in particular a leaf spring - or as an air cushion. Two-plate clamping unit according to at least one of claims 1 to 3, wherein the turntable ( 14 ) and / or the sliding table ( 13 ) have a tooth profile and this (this) by interaction with drive units ( 15 ) driven gears are rotatable or displaceable (is). Two-plate clamping unit according to claim 4, wherein the drive units ( 15 ) are electrically, electromagnetically, pneumatically and / or hydraulically. Two-plate clamping unit according to at least one of claims 1 to 5, wherein two rotary tables ( 14 ) provided by two sliding tables ( 13 ) alternately into the area between the base plate ( 2 ) and movable plate ( 3 ) are on and ausbringbar. Two-plate clamping unit according to at least one of claims 1 to 6, wherein spars ( 4 ) are provided, which the base plate ( 2 ) and the movable plate ( 3 ) and which both in the base plate ( 2 ) as well as in the movable plate ( 3 ) and are movable relative to these. Two-plate clamping unit according to claim 7, wherein pressure pads ( 6 ) are provided, through which the spars ( 4 ) are set to build a closing force under tension. Two-plate clamping unit according to claim 7 or 8, wherein in the base plate ( 2 ) and / or in the movable plate ( 3 ) to guide the spars ( 4 ) Jacks ( 8th ) are arranged. Two-plate clamping unit according to claim 8 or 9, wherein the closing force in the pressure pad ( 6 ) is hydraulically, electro-hydraulically and / or electromagnetically generated. Two-plate clamping unit according to at least one of claims 1 to 10, wherein a locking device ( 5 ) for locking the spars ( 4 ) with the movable plate ( 3 ) is provided. Two-plate clamping unit according to claim 11, wherein the locking device ( 5 ) is positively lockable. Two-plate clamping unit according to claim 11 or 12, wherein the locking device ( 5 ) as an electrical, electromagnetic or hydraulic locking device ( 5 ) is trained. Two-plate clamping unit according to at least one of claims 1 to 13, wherein the at least one turntable ( 14 ) is designed as a mold carrier for a mold half. Two-plate clamping unit according to at least one of claims 1 to 14, wherein the at least one rotary table ( 14 ) is designed as an index plate. Two-plate clamping unit according to at least one of claims 1 to 15, wherein the two-plate clamping unit ( 1 ) is formed frame-free. Two-plate clamping unit according to at least one of claims 1 to 16, wherein for moving the movable plate ( 3 ) in the vertical direction a - preferably electromechanical or hydraulic - Eilhubvorrichtung ( 9 ) is provided. Two-plate clamping unit according to claim 17, wherein the movable plate ( 3 ) only via the Eilhubvorrichtung ( 9 ) on the base plate ( 2 ) or supported on the ground. Injection molding machine ( 7 ) comprising: - at least one plasticizing unit ( 10 ) for at least one injection molding component, - at least one injection unit ( 12 ) for injecting the plasticized at least one injection molding component into a mold and - at least one vertical two-platen clamping unit ( 1 ) according to at least one of claims 1 to 18. Method for producing hybrid injection molded parts using an injection molding machine ( 7 ) according to claim 19, wherein - outside the area between the base plate ( 2 ) and movable plate ( 3 ) preparatory operations are performed on or in mold cavities of a mold half, - the mold half through the sliding table ( 13 ) is introduced into the region between the base plate and the movable plate, - in a first injection molding step, a part of the hybrid injection molded part is injection-molded, - the mold half through the turntable ( 14 ) is rotated, - in a second injection molding step, a further part of the hybrid injection molded part is injection molded and, - the mold half through the sliding table ( 13 ) is discharged from the area between the base plate and the movable plate. The method of claim 20, wherein - while a mold half in the area between the base plate ( 2 ) and movable plate ( 3 ) preparatory steps are performed on or in mold cavities of a further mold half, - after the one mold half from the area between the base plate ( 2 ) and movable plate ( 3 ), the other half of the mold by a sliding table ( 13 ) is introduced into the area between the base plate and the movable plate, A part of a second hybrid injection molded part is injection molded in a third injection molding step, the further half of the mold being injection molded by a turntable 14 ) is rotated, - in a fourth injection molding step, a further part of the second hybrid injection molded part is injection molded and, - the other half of the mold by a sliding table ( 13 ) from the area between base plate ( 2 ) and movable plate ( 3 ) is applied.

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