Two-component plasticizing unit and forming machine
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- ENGEL AUSTRIA
- Filing Date
- 2019-06-26
- Publication Date
- 2026-07-09
AI Technical Summary
Existing two-component plasticizing units face issues such as limited diameter due to vertical arrangement of secondary injection units, risk of collisions, long cycle times, and increased cycle times due to pivoting or misalignment, and inefficient material feeding in monosandwich injection molding processes.
A two-component plasticizing unit with a diversion device that redirects the second molten component from the secondary injection unit to the primary injection unit, allowing for independent movement of the secondary injection unit and diverting device, enabling compact design and reduced cycle times.
The solution prevents collisions, allows for larger secondary injection units, reduces cycle times, and ensures efficient material feeding, resulting in a space-saving and high-quality monosandwich injection molding process.
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Abstract
Description
[0001] The invention relates to a two-component plasticizing unit for a forming machine having the features of the preamble of claim 1 and a forming machine with such a two-component plasticizing unit.
[0002] A generic two-component plasticizing unit in the form of a plastic monosandwich plasticizing unit is disclosed in EP1 340 607 B1. A monosandwich process represents a special case of a two-component molding process in which the first molten component forms a core component in the finished molded part, and the second molten component forms a skin component surrounding the core component. A vertically arranged secondary injection unit for a skin component is located on the rear side (the side facing the injection side) of a fixed mold mounting plate. This results in a limitation on the possible diameter of the secondary injection unit with respect to the diameter of the plasticizing screw it contains (height, stability).There is a risk of collisions between the vertically arranged secondary injection unit and robots and platforms located above the fixed mold mounting plate. A long, cyclical pressure stroke of the primary injection device is required, resulting in long cycle times.
[0003] Another generic two-component plasticizing unit is described in EP 0 68 359 A1, in which the secondary injection unit is pivoted from the position in which the second molten component exits the secondary injection unit. A disadvantage of this design is that the cycle time is increased by the pivoting process, and there is a risk of collision with the moving and / or moving parts. Furthermore, the design must provide sufficient space for the pivoting of the secondary injection unit.
[0004] Another generic two-component plasticizing unit is described in DE 602 00 973 T2, in which the secondary injection unit is arranged perpendicular to the primary injection unit. A disadvantage of this design is that the second molten component is fed away from the gate and outside the mold mounting plate of the primary injection unit, which results in increased cycle time and negatively impacts material-specific properties.
[0005] The object of the invention is to provide a generic monosandwich plasticizing unit and a forming machine with such a monosandwich plasticizing unit, in which the problems discussed above are avoided.
[0006] This problem is solved by a two-component plasticizing unit with the features of claim 1 and a molding machine with such a two-component plasticizing unit. Advantageous embodiments of the invention are defined in the dependent claims. The invention is particularly suitable for plastic monosandwich injection molding.
[0007] According to the invention, a diversion device is provided by which the second molten component can be diverted from the at least one secondary injection unit to the at least one primary injection unit. The diversion of the second molten component occurs in such a way that the direction of movement (corresponding to a direction of extension of the at least one secondary injection unit) of the second molten component upon exiting the at least one secondary injection unit differs from the direction of movement in which the second molten component enters the at least one secondary injection unit. The latter direction of movement preferably runs opposite to a direction of extension of the at least one primary injection unit.The diverting device allows the placement of the at least one secondary injection unit with an essentially the same orientation (apart from a possible - preferably acute - angle between the extension directions of the at least one primary and secondary injection unit) as that of the at least one primary injection unit.
[0008] By means of a motion device, the diverting device, together with the at least one secondary injection unit, is movable between a first position and a second position relative to a melt outlet of the at least one primary injection unit. Preferably, the at least one primary injection unit remains stationary during this process, and only the diverting device and the at least one secondary injection unit are moved by a first motion mechanism of the motion device. Since a second motion mechanism, independent of the first motion mechanism, can be provided for the at least one primary injection unit, the movements of the diverting device and the at least one secondary injection unit can generally occur independently of movements of the at least one primary injection unit.
[0009] In the first position, the melt outlet opening can be pressed against the diverting device, and the molten second component can be injected from the at least one secondary injection unit, via the diverting device, into a receiving chamber of the at least one primary injection unit adjoining the melt outlet opening. This pressing action can be achieved by the aforementioned second movement mechanism or by a separate pressing mechanism.
[0010] In the second position, the melt outlet of the at least one primary injection unit (preferably located below it) can be moved (preferably displaced) past the diverting device in order to inject the second melt component located in the receiving chamber, together with a first melt component located further away from the melt outlet in the at least one primary injection unit, into a mold cavity. This movement past the diverting device can be accomplished by means of the second movement mechanism, which can also be used to press the at least one primary injection unit against a mold half.
[0011] One advantage over the prior art is that the second molten component is pushed as far forward as possible (near the gate) into the at least one primary injection unit, thus requiring little contact stroke of the at least one primary injection unit by the second movement mechanism and resulting in a reduction of the cycle time.
[0012] This results in a compact design for the two-component plasticizing unit. There is no risk of collisions between the secondary injection unit(s) and robots or platforms that may be located on top of the mold mounting plate. The invention can also be used for large shot weights because there are no limitations regarding the dimensions of the secondary injection unit(s), as they do not need to be arranged vertically. This results in a particularly space-saving installation. The space above the mold mounting plate, on the side of which the two-component plasticizing unit is located, remains unobstructed.
[0013] The first movement mechanism can, for example, comprise a guide preferably arranged on one of the mold mounting plates and a suitable drive for moving the at least one secondary injection unit and the diverting device along the guide.
[0014] The second movement mechanism can, for example, include a guide preferably arranged on the machine frame and a suitable drive for moving the at least one primary injection unit along the guide.
[0015] In one embodiment of the invention, the diversion device is connected to or formed with the at least one secondary injection unit. No separate movement mechanism for the diversion device is required.
[0016] In one embodiment of the invention, the first movement mechanism enables a displacement movement, preferably transverse to a direction of extension of the at least one primary injection unit, between the first and second positions. It is preferably provided that - by means of the first movement mechanism a displacement movement, preferably transverse to an extension direction of the at least one primary injection unit, between the first and second positions can be carried out, or that - a pivoting movement between the first and second positions can be performed by the first movement mechanism.
[0017] In one embodiment of the invention, the at least one primary injection unit and / or the at least one secondary injection unit each have at least one plasticizing screw mounted for translation and rotation. In such a case, the plasticizing of the plastic takes place within the at least one primary injection unit and / or the at least one secondary injection unit itself. Alternatively, at least with respect to one of the injection units, the melt component could be prepared separately and fed to the respective injection unit in molten form.
[0018] In one embodiment of the invention, it is provided that the at least one primary injection unit is connected or connectable to a recycling device.
[0019] In one embodiment of the invention, a console is provided for mounting the at least one secondary injection unit, wherein the console has a clearance through which the at least one primary injection unit extends. Thus, the at least one secondary injection unit can be arranged above the at least one primary injection unit. It is preferably provided that the console has a support surface for the at least one secondary injection unit that extends obliquely to one of the directions of extension of the at least one primary injection unit. The first movement mechanism can be designed along this support surface.
[0020] It may be provided that a melt outlet opening of the at least one primary injection unit and / or a melt outlet opening of the at least one secondary injection unit is designed to be closable.
[0021] In one embodiment of the invention, one of the mold mounting plates of the molding machine according to the invention has at least one through-opening for injecting melt, to be injected by the two-component plasticizing unit, into the mold cavity. It is preferably provided that the one of the at least two mold mounting plates which has the through-opening has a recess on its side facing the two-component plasticizing unit, into which the at least one primary and the at least one secondary injection unit and the diverting device project.
[0022] Exemplary embodiments of the invention are discussed with reference to the figures. For the sake of clarity, not all reference numerals are shown in every figure. Unless explicitly stated otherwise, design details described only in relation to one embodiment may, of course, also be present in the other embodiments. The figures show: Fig. 1a-f an implementation of a plastic monosandwich injection molding process with a forming machine according to the invention. Fig. 2a,b - Fig. 5a,b various embodiments of the forming machines according to the invention with two-component plasticizing units according to the invention, each in a partially cut-away side view and an associated perspective view Fig. 6 a partially cut-away side view of a further embodiment of a forming machine according to the invention with a two-component plasticizing unit according to the invention Fig. 7a,b - Fig. 8a,b two embodiments of the forming machines according to the invention with two-component plasticizing units according to the invention, each in a perspective view and a corresponding top view Fig. 9 a partially cut-away side view of a further embodiment of a forming machine according to the invention with a two-component plasticizing unit according to the invention
[0023] Fig. Figures 1a-f show a section of a forming machine (here: plastic injection molding machine) with a two-component plasticizing unit. 20 , in this case specifically with a plastic monosandwich plasticizing unit, with a primary injection unit 1for injecting a first molten component (here: a first thermoplastic material) of a molded part into a Fig. 1 mold cavity (not shown) and a secondary injection unit 2 for injecting a second molten component (here: a second thermoplastic material) of a molded part into the same mold cavity.
[0024] With the secondary injection unit 2 is a diversion device 3 connected, through which the second molten component is separated from the secondary component. 2 Injection unit for the primary injection unit 1 It can be diverted. The diversion device 3 The second molten component is directed from a secondary injection unit extending in the direction of expansion. 2 the first direction running in a direction opposite to the extension direction of the primary injection unit 1the second direction, wherein an angle between the first and second directions is given by the difference between the full angle of 360° and those angles which the extension directions of the primary and secondary injection unit 1 , 2 enclose each other. The diversion device 3 is subsequently connected to a melt outlet opening 11 the secondary injection unit 2 It is connected to this and can therefore be moved together with it.
[0025] Furthermore, a movement device is provided, through which the diversion device 3 together with at least one secondary injection unit 2 relative to a melt outlet 4 the primary injection unit 1 is movable between a first position and a second position such that in the first position the melt outlet opening 4to the diversion device 3 is pressable and the molten second component from the secondary injection unit 2 via the diversion device 3 into one that is attached to the melt outlet opening 4 adjoining recording room 5 the primary injection unit 1 injectable, and in the second position the melt outlet opening 4 the primary injection unit 1 at the diversion device 3 is movable to be in the recording room 5 a second molten component located further away from the molten outlet, together with one that is further away from the molten outlet 4 in the primary injection unit 1 to inject the first molten component into the mold cavity.
[0026] In Fig. 1a contains the secondary injection unit 2 and the diversion device 3in the second position. In the secondary injection unit 2 The second molten component for the molded part is now ready.
[0027] In Fig. 1b the secondary injection unit 2 and the diversion device 3 by a first movement mechanism of the movement device without movement of the injection unit 1 moved from the second position to the first position, in this embodiment by a movement perpendicular to a direction of extension of the primary injection unit 1 ongoing displacement movement.
[0028] In Fig. 1c became the primary injection unit 1 by a second movement mechanism (here a hydraulic piston-cylinder unit below the primary injection unit) 1 ) the movement device without movement of the secondary injection unit 2 and the diversion device 3in the second position on the diversion device 3 moved past (here: shifted) and to the diversion device 3 pressed down. In this state, the secondary injection unit can 2 the second molten component via a molten outlet opening 4 the primary injection unit 1 It is injected into these and collects in a space that borders the melt outlet. 4 adjoining recording room 5 in front of one that moves further away from the melt outlet opening 4 in the primary injection unit 1 before a backflow preventer 23 the first molten component.
[0029] In Fig. 1d is the injection of the second molten component into the primary injection unit. 1 completed and the second movement mechanism has the primary injection unit 1from the diversion device 3 moved away.
[0030] In Fig. 1e the first movement mechanism has the secondary injection unit 2 and the diversion device 3 moved from the first position to the second position. The primary injection unit 1 can now be achieved through the second movement mechanism below the diversion device 3 to be moved past this in order to be in the Fig. 1f shown condition in their recording room 5 the second molten component located further away from the molten outlet 4 in the primary injection unit 1 The first molten component is injected into the mold cavity (not shown). The second molten component is located within the primary injection unit due to its position. 1first injected into the mold cavity and displaced by the subsequently injected first molten component and pressed against a wall of the mold cavity, so that in the finished molded part the first molten component forms a core component of the molded part and the second molten component forms a skin component of the molded part.
[0031] The melt outlet opening 4 the primary injection unit 1 and the melt outlet 11 the secondary injection unit 2 can be designed to be lockable.
[0032] Fig. 2 shows a forming machine with a clamping unit 19 (here as a horizontal closing unit with stiles) 18 trained) and a two-component plasticizing unit 20 . On the mold clamping plates 8 , 9 are mold halves 21 , 22clamped together, forming a mold cavity when closed. The design of the clamping unit 19 can be done according to the state of the art, which is why details such as a mechanism for moving the mold mounting plate are not necessary. 8 relative to the mold clamping plate 9 or a mechanism for generating closing force, which are not shown. The invention is independent of the design of the closing unit. 19 usable. Preferably, however, that mold clamping plate 9 , which has at least one through-hole for the molten components to be injected, at its two-component plasticizing unit 20 a recess on the facing side 10 on, into which the primary injection unit 1 , the secondary injection unit 2 and the diversion device 3 protrude into it.
[0033] The primary injection unit1 and the secondary injection unit 2 are on a machine bed 12 arranged. The secondary injection unit 2 is on an inclined base surface of a console 13 arranged. The first movement mechanism, not shown here, can be used to control the secondary injection unit. 2 and thus the deflection device 3 move along the contact surface and thus the secondary injection unit 2 and thus the deflection device 3 move back and forth between the first and second positions.
[0034] The exemplary embodiment of the Fig. 3 differs from that of the Fig. 2 only by the fact that a second primary injection unit 1The system is designed to allow a third molten component to be injected into the same mold cavity as the first and second molten components. The third molten component can be different from or identical to the first and second molten components.
[0035] The exemplary embodiment of the Fig. 4 differs from that of the Fig. 2 only because a locking unit is located here 19 is provided in the form of a vertical locking unit.
[0036] Through the recess 10 This makes it possible to process the molten components close to the gate, which has the advantage that the processed molten components are only a short distance from the mold cavity and / or have to bridge it, thus ensuring a higher quality of the molten components.
[0037] Furthermore, it is advantageous that the cycle times can be shortened due to the small distance to be overcome to the mold cavity.
[0038] The exemplary embodiment of the Fig. 5 differs from that of the Fig. 2 only because there are two primary injection units here 1 and two secondary injection units 2 are provided for, each of which has its own deflection device 3 can be coupled together.
[0039] In the exemplary embodiment of the Fig. 6 will be the primary injection unit 1 through a recycling device 7 supplied with the first molten component. For this purpose, recyclable plastic is poured in via a hopper. 14 fed into the system. In the recycling plant, this is processed into plastic granules. Between the recycling plant 7 and the primary injection unit 1 (which here is a plasticizing snail)6 (has) is a sieve. 15 set. An analogous embodiment in which the secondary injection unit 2 through a recycling device 7 supplied with the second molten component, is in Fig. 9 shown.
[0040] The examples of implementation of Fig. 7 and Fig. Figure 8 illustrates that the movement of the secondary injection device 2 and the deflection device 3 between the first and second positions, the movement can be effected by the first moving device either in the form of a pivoting movement ( Fig. 7) or in the form of a displacement movement ( Fig. 8). Reference symbol list 1 primary injection unit 2 secondary injection units 3 Diversion device 4 Melt outlet opening of the primary injection unit 5 Recording room 6 plasticizing screws 7 Recycling device 8 Mold clamping plate 9 Mold clamping plate 10 Recess in mold clamping plate 11 Melt outlet opening of the secondary injection unit 12 machine bed 13 Console for the secondary injection unit 14 filling funnels for recyclate 15 Sieve of the recycling device 16 Filling funnels of the primary injection unit 17 Filling funnel of the secondary injection unit 18 stiles of the locking unit 19. Clamping unit of the forming machine 20 Plasticizing unit of the molding machine 21 half of the mold 22 half of the mold 23 Backflow preventer 24 Guidance of the first movement mechanism QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] EP 1340607 B1
[0002] EP 068359 A1
[0003] DE 60200973 T2
[0004]
Claims
[1] Two-component plasticizing unit (20), in particular a plastic monosandwich plasticizing unit for a molding machine, with - at least one primary injection unit (1) for injecting a first molten component of a molded part into a mold cavity and - at least one secondary injection unit (2) for injecting a second molten component of a molded part into the same mold cavity - a diversion device (3) is provided by which the second molten component can be diverted from the at least one secondary (2) injection unit to the at least one primary injection unit (1). - a movement device is provided by which the diversion device (3) together with the at least one secondary injection unit (2) is movable relative to a melt outlet opening (4) of the at least one primary injection unit (1) between a first position and a second position such that • in the first position the melt outlet opening (4) can be pressed against the diversion device (3) and the molten second component can be injected from the at least one secondary injection unit (2) via the diversion device (3) into a receiving chamber (5) of the at least one primary injection unit (1) adjoining the melt outlet opening (4), and • in the second position the melt outlet opening (4) of the at least one primary injection unit (1) can be moved past the diversion device (3) in order to inject a second melt-like component located in the receiving chamber (5) together with a first melt-like component located further away from the melt outlet opening (4) in the at least one primary injection unit (1) into a mold cavity, characterized by, that the at least one primary injection unit (1) has a preferably horizontal direction of extension and the at least one secondary injection unit (2) has a direction of extension and the directions of extension enclose an acute angle to each other and the at least one primary and at least one secondary injection unit are arranged at an angle such that the ends of the at least one primary and at least one secondary injection unit facing the melt outlet openings are arranged less far apart than the ends of the at least one primary and at least one secondary injection unit facing the filling funnels. [2] Two-component plasticizing unit according to claim 1, wherein the diversion device (3) is connected to or formed with the at least one secondary injection unit (2). [3] Two-component plasticizing unit according to at least one of the preceding claims, wherein the at least one movement device has a first movement mechanism for the diversion device (3) and the at least one secondary injection unit (2), by which these are movable between the first and second positions - preferably independently of the at least one primary injection unit (1). [4] Two-component plasticizing unit according to the preceding claim, wherein the first movement mechanism enables a displacement movement between the first and second positions, preferably transverse to an extension direction of the at least one primary injection unit (1). [5] Two-component plasticizing unit according to claim 3, wherein the first movement mechanism enables a pivoting movement between the first and the second position. [6] Two-component plasticizing unit according to at least one of the preceding claims, wherein the at least one movement device has a second movement mechanism for the at least one primary injection unit (1), by which the latter is movable, preferably displaceable, past the diversion device (3) in the second position, preferably independently of the at least one secondary injection unit (2) and the diversion device (3). [7] Two-component plasticizing unit according to at least one of the preceding claims, wherein the at least one primary injection unit (1) and / or the at least one secondary injection unit (2) have or have at least one plasticizing screw (6) mounted translationally and rotatorily. [8] Two-component plasticizing unit according to at least one of the preceding claims, wherein the at least one primary injection unit (1) and / or the at least one secondary injection unit (2) is or are connected to a recycling device (7). [9] Two-component plasticizing unit according to at least one of the preceding claims, wherein a console (13) is provided for storing the at least one secondary injection unit (2), wherein the console (13) has a free space through which the primary injection unit (1) extends. [10] Two-component plasticizing unit according to the preceding claim, wherein the console (13) has a support surface for the at least one secondary injection unit (2) extending obliquely to an extension direction of the at least one primary injection unit (1). [11] Molding machine, in particular plastic injection molding machine, comprising: - a clamping unit (19) with at least two mold mounting plates (8, 9) that are movable relative to each other, to which mold halves (21, 22) can be attached, which in a closed state of the at least two mold mounting plates (8, 9) form a mold cavity together - a two-component plasticizing unit (20) according to at least one of the preceding claims, by means of which molten components of a molded part to be formed can be injected into the mold cavity. [12] Molding machine according to the preceding claim, wherein one of the mold mounting plates (8, 9) has at least one through-hole for injecting molten components to be injected into the mold cavity by the two-component plasticizing unit (20). [13] Molding machine according to the preceding claim, wherein the one of the at least two mold mounting plates (8, 9) which has the at least one through-opening has a recess (10) on its side facing the two-component plasticizing unit (20) into which the at least one primary injection unit (1), the at least one secondary injection unit (2) and the diverting device (3) project.