EP2100678B1 - Die-casting tool for a die-casting machine - Google Patents

Abstract

The pressure casting tool (1) has a second mold with third and fourth mold parts (7, 8), moving linearly to open and close in the same way as the mold parts (5, 6) of the first mold. At least one further mold cavity is formed between them. One form part of the first mold and one of the second mold are arranged back-to-back to receive an intermediate element incorporating the casting run.

Description

The invention relates to a die-casting tool of a die-casting machine, having a first mold, which has a first and a second mold part, which are movable linearly relative to one another for mold closing and mold opening and form at least one mold cavity between them, and with at least one casting run, wherein at least one further, second mold having a third and a fourth mold part, which are aligned for form closure and mold opening rectified to the mold parts of the first form linearly movable and form at least one further mold cavity between them, wherein a molded part of the first mold and a molded part of the second mold back are arranged to each other back and record between them an intermediate element having the casting run and wherein the casting run leads to both mold cavities.

Diecasting tools of the type mentioned are known. They are used in a die casting machine. For filling (shot) of the mold cavity, a hot, liquid medium, for example a metal, a metal alloy or plastic, is placed over the run over the runner. Previously, the form consisting of a first and a second molded part must be closed. If the medium in the casting chamber and the mold cavity solidifies, the two mold parts are moved apart. by virtue of This procedure limits the number of workpieces that can be produced per unit of time. In order to increase the number of workpieces, several casting depressions for forming a plurality of mold cavities may be present in the two mold parts. However, the area available for this is limited due to the materials to be handled, the mold closing pressure to be applied and so on.

In the US-A-1717254 is described a manually operable machine. The filling of the cavity takes place from top to bottom. There is an opposing piston for this purpose. The watering system is vertical.

Furthermore, the disclosure DE 10225165 A1 a universal mold with a stack mold for an injection molding system.

In the in the DE 10225165 A1 described method for producing injection molding, in particular die-cast components and injection molding or die casting tools is carried out the separation of the sprue with the mold closed.

In the Gb-A-1569382 It is a low-pressure casting process with two chambers filled from bottom to top. The gless chamber is located directly in the melt.

In the WO00 / 06322 A It is about the production of cores, which are then inserted into an injection mold. Again, the Giesskammer is located directly in the melt.

The invention is therefore an object of the invention to provide a die-casting tool of a die-casting machine, which has a very high production capacity, that is, it can be created per unit of time a variety of cast workpieces.

This object is achieved in that the intermediate element (4) is associated with a shearing device (21) for shearing off at least one sprue (24), preferably of both forms (2,3) sprue (24), and that the intermediate element (4 ) has at least two Auswerfervorrichtungen (19,20) for the two forms (2,3).

As a result of this embodiment, a floor pressure die casting tool is obtained, that is to say, the at least two shapes are arranged in the form of a tier, wherein superimposition or juxtaposition of the forms is meant here. With the same die casting machine, therefore, multiple molds are used simultaneously, so that a corresponding increase in productivity sets. The invention is not limited to two forms, but it can also be used in terms of floor and more than two forms in superimposed and / or side-by-side construction. The arrangement is made such that at least one of the associated mold parts is linearly displaced to open the respective mold. This linear movement takes place transversely, in particular at right angles, to a mold parting plane. Thus, the individual levels of the multi-mold pressure tool will open for mold move linearly in the manner mentioned and linearly displaced to close the form in the corresponding opposite direction. The method and the displacement movement is always - as already mentioned - transversely, in particular at right angles to the individual mold parting planes of the molds, wherein the mold parting planes between the two mold parts of each mold are To fill the die casting tool according to the invention with a medium, for example with a liquid metal alloy can, is arranged between the at least two forms an intermediate element having the casting run. About the casting the at least two mold cavities of the at least two forms are filled. For demolding of the produced workpieces, the molds are opened after solidification of the medium by linear separation. Due to the mentioned stack construction of the die-casting tool according to the invention, only a very small amount of space is required for operation, since the two forms require only one drive and support device of the die-casting machine. In the prior art, it is necessary for the operation of two molds to use two die casting machines, which consequently require a much larger footprint.

According to a development of the invention, it is provided that the casting run leads to both mold cavities. Consequently, the filling of both mold cavities can take place via a casting run. Of course, the invention is not limited to two mold cavities, but each of the at least two molds may have a plurality of mold cavities.

It is envisaged that the intermediate element a shearing device for shearing off at least one sprue, preferably a sprue of both forms. In the region of the intermediate element, that is to say in the zone between the at least two forms, the shearing device is located. It shears off the runner formed in the run. It is particularly effective if a shearing device shears off the sprue of both forms, wherein there is preferably a common sprue for the shapes which is separated from the shearing device.

The shearing device preferably has a linearly movable shearing knife, wherein the traversing direction of the shearing knife extends transversely, in particular at right angles to the linear traversing directions of the shaped parts. By this arrangement, the space of the overall arrangement is used optimally, wherein the freedom of movement for the mold parts and the shearing blade angle, in particular at right angles to each other.

According to the invention it is provided that the intermediate element has at least two Auswerfervorrichtungen for the two forms. Consequently, the ejection means are also accommodated in the intermediate element in order to empty the at least two molds. The Auswerfervorrichtungen are therefore space-optimized between the two forms.

The ejector devices have ejector cylinders, in particular block cylinders, which are arranged laterally of the molded parts, which adjoin the intermediate element. The space for positioning the Auswerfzylinder the Auswerfervorrichtungen is therefore used laterally adjacent to the intermediate element associated moldings. Here, the ejector cylinders do not appear disturbing and use an otherwise unused space.

The intermediate element preferably has two intermediate element parts, which are arranged back to back to each other. Each intermediate element part is assigned to one of the two forms.

A development of the invention provides that the first mold part of the first mold is a solid mold part, to which - for mold closing and mold opening of the first mold - a unit consisting of the first mold part of the first mold, the intermediate element and the third mold part of the second mold is linearly movable and that to the unit - for mold closing and mold opening of the second mold - the fourth molding is linearly movable. For opening and closing the mold, the first mold part of the first mold retains its position, which is why it is a solid mold part. If the molds are to be opened, then a linear process of the unit, which consists of the second mold part of the first mold, the intermediate element and the third mold part of the second mold. At the same time, before or after, the fourth mold part is moved along a linear path to open the second mold. If more than two shapes are arranged on the floor, the above statements apply accordingly.

In particular, the first molded part has a fixed, interchangeable mold insert and the second, third and fourth molded parts have moving, interchangeable mold inserts. All mold inserts are interchangeable to produce different workpieces, however, the first mold part has a fixed mold insert, because this does not change its position during operation of the die-casting tool. The word "fixed" therefore refers to the fixed positioning. The remaining moldings have moving mold inserts, because the moldings and thus their associated Move mold inserts when closing and opening the respective shape, so change their positions.

Finally, it is advantageous if a fixed platen and a linearly movable over guide columns, movable platen is provided, wherein between the two platen at least the two molds and at least one intermediate element are arranged. The two platens hold the stack of packages consisting of the mold parts and the intermediate element in the closed position of the molds and they move apart to open the molds. If more than two forms are present, more than one intermediate element is necessary because there is an intermediate element between each two forms.

Figur 1

eine Seitenansicht auf ein Druckgusswerkzeug einer Druckgussmaschine in Schließstellung,

Figur 2

die Darstellung der Figur 1 in teilweise geöffneter Stellung,

Figur 3

die Darstellung der Figur 1 in geöffneter Stellung,

Figur 4

einen unteren Bereich des Druckgusswerkzeugs im Bereich einer Abschervorrichtung, die einen Abschervorgang eines Angusses beginnt,

Figur 5

die Darstellung der Figur 4 bei abgeschertem Anguss,

Figur 6

eine detaillierter Darstellung der Figur 1,

Figur 7

eine detaillierter Darstellung der Figur 3 und

Figur 8

einen Bereich der Darstellung der Figur 7 in perspektivischer Darstellung.

The drawings illustrate the invention of an embodiment, in which:

FIG. 1

a side view of a die casting tool of a die-casting machine in the closed position,

FIG. 2

the representation of FIG. 1 in partially open position,

FIG. 3

the representation of FIG. 1 in open position,

FIG. 4

a lower portion of the die casting tool in the area of a shearing device that starts a shearing of a gate,

FIG. 5

the representation of FIG. 4 with sheared sprue,

FIG. 6

a detailed description of the FIG. 1 .

FIG. 7

a detailed description of the FIG. 3 and

FIG. 8

an area of representation of the FIG. 7 in perspective view.

The FIG. 1 shows a die-casting tool 1 in a die-casting machine not shown in detail, which has a first mold 2, a second mold 3 and an intermediate element 4 arranged between the two molds 2 and 3. The first mold 2 has a first molded part 5 and a second molded part 6. The second mold has a third mold part 7 and a fourth mold part 8. The intermediate element 4 is composed of two intermediate element parts 9 and 10. The respective plate-shaped moldings 5 to 8 and intermediate element parts 9 and 10 are - standing upright - surface to each other, wherein the first mold part 5 abuts the second mold part 6, the second mold part 6 rests on the intermediate element part 9, the intermediate element part 9 on the intermediate element part 10, the intermediate element part 10 on the third mold part 7 and the third mold part 7 on the fourth mold part 8. Between each of the above-mentioned parts in each case a parting plane is formed, wherein the parting planes parallel to each other and are vertical in the illustrated embodiment. The first mold part 5 is acted upon by a fixed platen 11, extending from the guide columns 12, 13, on which linearly displaceable a movable platen 14 superimposed, wherein between the two platen 11 and 14, the two molds 2 and 3 and the intermediate element 4 are arranged , By means of a drive device, not shown, the molds 2 and 3 and the intermediate element 4 clamp by means of the clamping plates 11 and 14 stacked together. As a result, the mold parts 5 and 6 and 7 and 8 are brought onto each other, so that a closed state of the molds 2 and 3 is present. In each case at least one mold cavity is formed between the mold elements 5 and 6 or 7 and 8, so that - corresponding to the number of mold cavities formed - a corresponding number of workpieces can be produced by introducing a hot, solidifying medium in a filling channel 15. The filling channel 15 leads to a running between the two intermediate element parts 9 and 10 casting run 16 ( FIG. 2 ), so that the medium can flow through corresponding casting channels into the mold cavities. After solidification of the workpieces produced in this way, the molds 2 and 3 according to FIG. 2 open. For this purpose, a unit consisting of the molded part 6, the intermediate element 4 and the molded part 7 moves along the guide columns 12 and 13 in such a way that the molded parts 5 and 6 separate. Furthermore, the clamping plate 14 moves together with the molding 8 such that the mold 3 opens ( FIG. 2 ).

The FIG. 3 shows the completely disassembled state. The distances between the mold parts 5 and 6 on the one hand and 7 and 8 on the other hand are so large that a demolding of the produced workpieces 18 can be done easily.

From the FIGS. 1 to 3 It can be seen that the two molds 2 and 3 are arranged in stack form with the interposition of the intermediate element 4. Since the medium is introduced by means of the intermediate element 4 in the two forms 2 and 3, they can be due to the intermediate position of the intermediate element 4 simultaneously and feed only one run 16. Furthermore, the intermediate element 4 has ejection devices 19 and 20, the ejection device 19 being assigned to the intermediate element part 9 and the ejection device 20 to the intermediate element part 10. In the area of the intermediate element 4 is - according to FIG. 1 - Further, a shearing device 21 (in the Figures 2 and 3 not shown), which serves for shearing a sprue. This is the solidified medium in the casting run 16. Hereinafter will be discussed in more detail.

The FIGS. 4 and 5 show the shearing device 21, which has a slider 22 which is reciprocated linearly, with its direction of movement parallel to the parting planes - and thus perpendicular to the direction of movement of the molded parts - between the mold parts 5 to 8 and intermediate element parts 9 and 10 extends. The slide 22 is moved out of the shearing device 21, it meets a sprue 24. This consists of a fully or partially solidified medium and is freely accessible by moving apart of the intermediate element parts 9 and 10. By the successful movement of the Abschermessers 23, the gate 24 is separated so that he - according to FIG. 5 - falls down (arrow 25). Subsequently, the shearing blade 23 (according to FIG FIG. 5 ) are retracted again.

The FIGS. 6 to 8 clarify the representations of the FIGS. 1 to 3 , After shearing off the sprue 24, the workpieces 18 are removed from the mold. For this purpose, ejector plates 26 and 27, which belong to the ejector devices 19 and 20, are provided on the intermediate element parts 9 and 10. The Auswerfervorrichtungen 19 and 20 have ejector 28 and 29, the laterally or after arranged above the mold parts 6 and 7 and formed as a block cylinder. They allow the application of an ejection force such that the workpieces 18 - as in FIG. 7 visible - ejected. The FIG. 8 shows a perspective view of the arrangement of FIG. 7 , but rotated about a vertical axis by 180 ° and in perspective view. It can be seen that the mold parts 5 to 8 each carry mold inserts 30 and 31, which are interchangeable to produce different workpieces 18 can.

A comparison of FIGS. 6 and 7 shows that in the closed position, the stack of floors, which is formed by the first mold 2, the second mold 3 and the intermediate element 4, the distance d. In the fully open position according to FIG. 7 is the distance 2d, so it is about twice as large. Helleraus follows that the diecasting tool 1 according to the invention requires only a relatively small footprint for its operation and yet due to the multi-storey construction, a plurality of workpieces 18 per unit time can be made.

Has the die-casting tool 1 a production cycle according to the FIGS. 1 to 3 go through, the molds 2 and 3 are closed again and it can be made a die-casting process again.

Claims (7)

1. Die casting tool of a die casting machine, comprising a first mold having a first and a second mold part, which can be shifted linearly in relation to each other for the purpose of mold closing and mold opening and which, between them, constitute at least one mold cavity, and comprising at least one casting runner, at least one further, second mold (3) having a third and a fourth mold part (7, 8), which can be shifted linearly in relation to each other, acting in the same direction as the mold parts (5, 6) of the first mold (2), for the purpose of mold closing and mold opening and, between them, constituting at least one further mold cavity, a mold part (5, 6) of the first mold (2) and a mold part (7, 8) of the second mold (3) being arranged back-to-back in relation to each other and accommodating between each other an intermediate element (4) that comprises the casting runner (16), and the casting runner (16) leading to both mold cavities, characterized in that a shearing device (21), for shearing off at least one sprue (24), is assigned to the intermediate element (4) and in that the intermediate element (4) has at least two ejector devices (19, 20) for the two molds (2, 3).
2. Die casting tool according to Claim 1, characterized in that the shearing device (21) has a shearing blade (23) that can be shifted linearly, the shift direction of the shearing blade (23) running transversely, in particular at right angles, in relation to the linear shift directions of the mold parts (5, 6, 7, 8).
3. Die casting tool according to Claim 1, characterized in that the ejector devices (19, 20) have ejection cylinders (28), in particular block cylinders, which are arranged at the side of the mold parts (5, 6, 7, 8), which adjoin the intermediate element (4).
4. Die casting tool according to any one of the preceding Claims 1 to 3, characterized in that the intermediate element (4) has two intermediate-element parts (9, 10), which are arranged back-to-back in relation to each other.
5. Die casting tool according to any one of the preceding claims, characterized in that the first mold part (5) of the first mold is a fixed mold part (5), in relation to which - for the purpose of closing and opening the first mold (2) - a unit, consisting of the second mold part (6) of the first mold (2), the intermediate element (4) and the third mold part (7) of the second mold (3), can be shifted linearly, and - for the purpose of closing and opening the second mold (3) - the fourth mold part (8) can be shifted linearly in relation to the unit.
6. Die casting tool according to any one of the preceding claims, characterized in that the first mold part (5) has a fixed, exchangeable mold insert (30), and the second, the third and the fourth mold part (6, 7, 8) have traveling, exchangeable mold inserts (30, 31).
7. Die casting tool according to any one of the preceding claims, characterized by a stationary fixing platen (11), and a movable fixing platen (14) that can be shifted linearly in relation thereto via guide posts (12, 13), at least the two molds (2, 3) and at least the one intermediate element (4) being arranged between the two fixing platens (11, 14).

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