DD256477A5 - Closure unit for a device for injection molding of thermoplastic plastics - Google Patents

Closure unit for a device for injection molding of thermoplastic plastics Download PDF

Info

Publication number
DD256477A5
DD256477A5 DD30268287A DD30268287A DD256477A5 DD 256477 A5 DD256477 A5 DD 256477A5 DD 30268287 A DD30268287 A DD 30268287A DD 30268287 A DD30268287 A DD 30268287A DD 256477 A5 DD256477 A5 DD 256477A5
Authority
DD
German Democratic Republic
Prior art keywords
plate
mold
plunger
pressure
closing
Prior art date
Application number
DD30268287A
Other languages
German (de)
Inventor
Heinz Leonhartsberger
Alfred Woegerer
Original Assignee
Ludwig Engel Kg,At
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AT126686A priority Critical patent/AT385464B/en
Application filed by Ludwig Engel Kg,At filed Critical Ludwig Engel Kg,At
Publication of DD256477A5 publication Critical patent/DD256477A5/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • B29C2045/645Mould opening, closing or clamping devices using magnetic means

Abstract

Described is a closing unit for a device for injection molding thermoplastics, with a fixed and a movable along Holmen Formtraegerplatte, each carrying a Formhaelfte, and with a fixed face plate in which a plunger is guided. In order to increase or generate the positive locking pressure, at least one electromagnet (12, 16, 17) is provided on the end plate (7) and / or a part of the plunger (6) facing the end plate, which force exerts a force directed towards the mold in the current-carrying state Pressure stamp (6) exercises. Fig. 1

Description

For this 3 pages drawings
Field of application of the invention
The invention relates to a closing unit for a device for injection molding thermoplastics, with a fixed and a movable along Holmen mold carrier plate, which each carry a mold half, and with a fixed end plate, in which extending in the direction of the machine axis, for opening and Closing the mold and for applying the mold clamping pressure serving plunger is guided.
Characteristic of the known state of the art
There are several technical possibilities known or conceivable to move the plunger of such a closing unit from the open position of the mold in the closed position and vice versa. Problems generally arise only in that the drive used to move the plunger should also generate the pressure required to hold the mold. This requirement makes the hydraulic systems, which are an integral part of today's usual closing units, relatively expensive. In order to produce the necessary mold clamping pressure, the pressure of a hydraulic medium is generally very high (up to 300 bar), which is why stringent safety regulations must be observed, which include, in particular, frequent monitoring of the hose and piping.
The system pressures that occur can be reduced if the hydraulic cylinders do not apply the mold clamping pressure to the mold directly but via the toggle lever. However, the advantage gained thereby is at least made up for by the need to make and maintain a number of other moving parts. In principle, considered electromechanical locking systems are even more complicated and currently do not provide any solution for the transition from that phase in which the mold is to be moved relatively quickly to the injection phase in which the mold is to be kept closed with high pressure. ,
Object of the invention
The aim of the invention is to avoid the disadvantages of known devices.
Explanation of the essence of the invention
The invention has for its object to provide a closing unit for a device for injection molding of thermoplastic materials available.
The invention is based on the recognition that much simpler hydraulic systems can be used or can be bypassed by the hydraulic drive of the plunger, if the drive system for the plunger does not have to generate the mold clamping pressure. According to the invention is provided in this sense, for increasing or generating the mold clamping pressure on the end plate and / or one of the end plate facing parts of the plunger
to arrange at least one electromagnet, which in the current-carrying state exerts a shape-directed force on the plunger.
The use of electromagnets according to the invention has i.a. the great advantage that the closing force to be applied can be chosen differently by changing the current intensity according to the selected internal mold pressure. It is also possible, after the injection and holding pressure phase, ie during the cooling phase, to lower the closing force by reducing the current intensity in the individual generating operation.
According to an advantageous embodiment, the closing unit is characterized in that the one or more electromagnets are arranged between a pressure plate connected to the pressure plate and the back of the end plate. Between plunger and pressure plate a screw is provided. The distance of the pressure plate is changeable from the movable form by a geared motor. Further, in a conventional manner, a support plate can be inserted through a slide between the front of the face plate and the end of the plunger. The support plate and the plunger bear in their facing areas electromagnets, which repel in a current-carrying state.
embodiments
The invention will be explained in more detail with reference to the accompanying drawings in an embodiment. Show:
Fig. 1: the top view of a first embodiment, wherein parts of the arrangement are cut, Fig. 2 and 3: the corresponding plan view and side view of a second embodiment.
The injection molding device shown schematically consists of a fixed mold carrier plate 1, which cooperates with a movable mold carrier plate 5, which is longitudinally displaceable on spars 2. An injection unit 14 is provided, which brings the mass serving to form the shaped body into the forming space formed by the fixed mold half 3 and the mold half 4. In order to open the mold for the purpose of removing the finished molding, the movable mold carrier plate 5 by means of the plunger 6, which is mounted in the fixed end plate 7, in the drawing to the left and to close the mold in the reverse direction displaceable. In the illustrated embodiment, hydraulic cylinders 15 serve for this displacement, wherein the hydraulic medium can be under low pressure, since it is used only for the movement of the mold carrier plate 5, but not for the production of the mold clamping pressure. Rather, an electromagnet 12, which is provided on a pressure plate 8 connected to the plunger 6, serves to generate the closing pressure. When this solenoid 12 is activated, it pulls the pressure plate 8 against the end plate 7, whereby the mold halves are pressed increasingly firmly against each other until, by stretching the spars 2, the gap between the plates 7 and 8 is closed. On the one hand, the gap width should be variable in order to be able to limit the closing force to different values for a given mold height and, on the other hand, to compensate for different mold heights. To adjust the distance of the pressure plate 8 of the movable mold carrier plate 5 is a geared motor 10, which adjusts the screw connection between the pressure plate 8 and the plunger 6.
The force exerted by the electromagnet 12 on the end plate 7 increases in force as the gap between the plates 7 and 8 decreases, ie with increasing elongation of the spars 2 or increasing reduction of the mold height. The illustrated embodiment is thus particularly preferable if the mold height, as is necessary in injection-compression, should be reduced by external action.
The second embodiment differs from the discussed insofar as here the plunger 6 is shorter, so that it ends in the closed mold in front of the end plate 7. The pressure to hold the mold can be made in this case in a known manner by a pressure pad is inserted between the end plate 7 and plunger 6. What is new is that, according to the invention, this cushion does not function hydraulically, but by means of magnetic repulsion. The support plate for the plunger 6, which is brought after closing the mold by means of a slider 18 to the front of the end plate 7, that is designed as an electromagnet 17, which faces an adjustable at the end of the plunger 6 by means of an adjusting screw 11 further electromagnet 16 , The electromagnets 16 and 17 have their poles of the same name to each other, so that there is a repulsion between them. As in the first embodiment, the magnetic force acts in the sense of a closure of the mold or an elongation of the spars. However, here decreases with increasing reduction of the mold height, the force applied, whereas on the other hand, when a divergence of the mold halves, the gap between the electromagnets 16 and 17 is reduced, whereby the magnetic force increases and the disengagement of the mold halves comes to a standstill. The arrangement according to the Ausführungsbeispiei of FIG. 2 and 3 will therefore choose if it usually does not matter to further compress the mold halves from a starting position ago, but that it is about to limit their movement apart under the influence of the internal mold pressure.

Claims (4)

1. Closing unit for a device for injection molding thermoplastics, with a fixed and a movable along Holmen mold carrier plate, which each carry a mold half, and with a fixed injection plate, in which extending in the direction of the machine axis, for opening and closing the mold and for the application of the mold closing pressure serving plunger is guided, characterized in that for increasing or generating the mold clamping pressure on the end plate (7) and / or one of the end plate facing part of the plunger (6) at least one electromagnet (12; 16; is, which exerts a shape-directed force on the plunger (6) in the current-carrying state.
2. Closing unit according to claim 1, characterized in that the one or more electromagnets (12) between a with the plunger (6) connected to the pressure plate (8) and the back of the end plate (7) are arranged.
3. Closing unit according to claim 2, characterized in that a screw connection (11) between plunger (6) and pressure plate (8) is provided, and the distance of the pressure plate (8) from the movable mold (5) by a geared motor (10). is changeable.
4. Closing unit according to claim 1, characterized in that in a conventional manner by a slide (18) a support plate between the front of the end plate (7) and the end of the plunger (6) can be inserted, and that the support plate and the plunger (6) carry electromagnets (17,16) in their mutually facing regions, which repel in a current-carrying state.
DD30268287A 1986-05-13 1987-05-12 Closure unit for a device for injection molding of thermoplastic plastics DD256477A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT126686A AT385464B (en) 1986-05-13 1986-05-13 Locking unit for a device for injection molding thermoplastic plastics

Publications (1)

Publication Number Publication Date
DD256477A5 true DD256477A5 (en) 1988-05-11

Family

ID=3510167

Family Applications (1)

Application Number Title Priority Date Filing Date
DD30268287A DD256477A5 (en) 1986-05-13 1987-05-12 Closure unit for a device for injection molding of thermoplastic plastics

Country Status (4)

Country Link
AT (1) AT385464B (en)
DD (1) DD256477A5 (en)
DE (1) DE3715160A1 (en)
IT (1) IT1204582B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336572C1 (en) * 1993-10-27 1994-12-15 Ferromatik Milacron Maschinenb Mould-locking mechanism, in particular on injection-moulding machines
DE10123277A1 (en) * 2001-05-07 2002-11-28 Indrustrial Technology Res Ins Electro-magnetic clamping of injection-molding tool, includes provision for reversing the current supply to move tool halves to open position

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3866771D1 (en) * 1987-05-07 1992-01-23 Hemscheidt Maschtech Schwerin METHOD AND DEVICE FOR GENERATING THE CLOSING FORCE OF THE CLOSING UNIT OF AN INJECTION MOLDING MACHINE.
DE3933348C2 (en) * 1989-10-06 1992-06-25 Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De
EP0669198A1 (en) * 1994-02-28 1995-08-30 Schoeller-Plast S.A. Injection moulding apparatus
DE19620360C2 (en) * 1996-05-13 2001-10-04 Mannesmann Ag Method and device for operating an injection molding machine
DE19956188C2 (en) * 1999-11-22 2003-07-31 Karl Hehl Mold closing unit for an injection molding machine
RU2213660C1 (en) * 2002-02-20 2003-10-10 Общество с ограниченной ответственностью "МГП Этакор" Device for manufacture of articles by inflation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336572C1 (en) * 1993-10-27 1994-12-15 Ferromatik Milacron Maschinenb Mould-locking mechanism, in particular on injection-moulding machines
DE10123277A1 (en) * 2001-05-07 2002-11-28 Indrustrial Technology Res Ins Electro-magnetic clamping of injection-molding tool, includes provision for reversing the current supply to move tool halves to open position
DE10123277B4 (en) * 2001-05-07 2008-02-28 Indrustrial Technology Research Institute Method and device for the electromagnetic closing, holding and opening of molds of an injection molding machine
DE10123277B8 (en) * 2001-05-07 2008-10-16 Industrial Technology Research Institute Method and device for the electromagnetic closing, holding and opening of molds of an injection molding machine

Also Published As

Publication number Publication date
ATA126686A (en) 1987-09-15
DE3715160A1 (en) 1987-11-19
IT8720458D0 (en) 1987-05-11
AT385464B (en) 1988-04-11
IT1204582B (en) 1989-03-10

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