EP2646181B1 - System comprising an extrusion plate and an adapter piece for mounting on an extrusion apparatus - Google Patents

Description

The invention relates to a system comprising a press disk and an adapter piece for mounting on the press ram of a press device, the press disk comprising at least one filler piece with a pressing surface via which a force can be exerted on a material to be pressed. The filler piece is surrounded by a sealing ring that is also part of the press disk, the inner diameter of which is designed in such a way that it forms a first gap with its inner conical surface and the outer conical surface of the filler piece. Furthermore, at least one radial gap runs between the filler piece and the sealing ring, which gap widens conically from the inside to the outside.

According to the prior art, presses are known which comprise press disks with which pressure can be transferred to the material to be pressed. The press disks are usually rotationally symmetrical and, during the pressing process, are located in a receptacle that surrounds them. Usually the press washer is made of a metal such as hot-work steel.

During pressing, the press disk is exposed to a strong pressure load and an increase in diameter, which leads to stress on the material. This stress leads to wear of the press disk material. Furthermore, with the pressing devices according to the state of the art, the problem arises that at the beginning of the pressing process, air contained in the receiver often cannot completely escape and affects the material to be pressed.

Therefore, efforts are being made to develop press disks which have the lowest possible material stress and thus a longer service life for the press disk. For example, the German Patent DE 100 36 463 B4 , which forms the basis for the preamble of claim 1, an advantageous pressing disk and a pressing device with such a pressing disk, in which the pressing disk comprises a filler piece with a pressing surface with which a force can be exerted on a material to be pressed. The filler piece is surrounded by a sealing ring, which is designed with its inner diameter so that it with its inner conical surface and the outer conical surface of the filler piece forms a first gap. Furthermore, at least one radial gap runs between the filler piece and the sealing ring, which gap widens conically from the inside to the outside.

From the WO 98/03 277 A1 a press disk with a base part, a connecting element for connecting the base part to a press ram, an exchangeable wear ring attached to a front, circumferential area of the press disk, and a device for releasably securing the locking ring to the base part is known. The press disk also contains a device for latching the press pot into the wear ring during pressing. The wear ring is made of metal and has a conical inner surface that converges towards the base part. The device for latching the press pot into the locking ring contains a metallic plunger with an end face with a conical surface, the plunger end face being pressed into the ring during pressing. The converging surfaces of the ring and press ram end face are spaced apart so that the press ram is prevented from plunging into the ring.

The German utility model DE 73 14 414 U describes a press disk for press rams of extrusion presses, the press disk having a circular recess on the face side facing the material to be pressed, and which furthermore has a conical seat surface for contact with an inner plate, which is flush with the face of the press disk in the applied state.

Furthermore, the German patent application discloses DE 41 32 810 A1 a fixed press disk for the ram of a metal extrusion press with a venting device. Due to the convex design of the side of the press disk facing the press material, the air trapped in the recipient space during the upsetting of the bar can escape via the not yet expanded wear ring, as well as via the bores arranged in the expansion ring.

The object of the invention is therefore to provide a press washer with efficient ventilation, high wear resistance and thus a long service life, which has the lowest possible overall height and whose wear parts can be easily assembled and disassembled from the front without the need for a large number of other components must be assembled and disassembled.

According to the invention, this object is achieved by a system comprising a press disk and an adapter piece with the features of independent claim 1. Advantageous further developments of the system emerge from the subclaims 2-5. The object is also achieved by a pressing device according to claim 6.

The press disc according to the invention according to the preamble of claim 1 is characterized in that, depending on the direction of rotation, the press disc on the press ram can be secured or released against axial movement by rotating the sealing ring around the axis of rotation of the press disc, whereby the sealing ring and the filler piece from the front side of the press disc can be mounted and dismounted from the press ram. By turning the sealing ring, the wearing parts such as the filler piece and the sealing ring can therefore be easily assembled and disassembled from the front.

However, it is also decisive for the functioning of the press washer according to the invention that the retraction forces are transmitted to the sealing ring via the connecting element. The sealing ring expands to a limited extent even with maximum pressure load and is thus not loaded in the cone during the retraction movement, so that expansion due to frictional forces on the transducer is prevented. Furthermore, a bending stress is generated which greatly reduces wear on the press disk, in particular the conical surfaces, and widens the press disks at the desired point in time. The radial gap between the filler piece and the sealing ring enables this bending moment in the filler piece, which leads to greater wear resistance of the filler piece and thus of the press washer. Furthermore, when the material to be pressed is upset, the pressure is passed on in the middle before the press disk expands, which leads to better and, in particular, more uniform ventilation.

With this type of press disk, a longer service life can thus be achieved, which has less wear and tear and ensures the increase in diameter and the subsequent relief in the long term. Furthermore, the inclusion of air in the pressing volume is prevented, whereby the pressing quality is improved.

The construction of the press disc and a connecting element that connects the press disc to the adapter of a ram and on the other hand transfers the retraction forces to the sealing ring means that the overall height of the press disc can be significantly reduced, which leads to material savings and easier handling.

Furthermore, it is possible that not only the retraction forces are transmitted via the respective connecting element, but also the compressive forces, whereby the overall height of the press disk can also be reduced without this negatively affecting the functionality and service life of the press disk. The sealing ring retains its elasticity despite the low overall height. At least part of the end face of the connecting element is in contact with at least part of the surface of the adapter piece, and at least a part of the surface of the sealing ring opposite the material to be pressed is also in contact with at least part of the surface of the adapter piece when the pressing disk is subjected to pressure. Due to the elasticity of the material used for the sealing ring, which is usually made from a hot-work steel, it is possible to produce such a constellation with a reasonable manufacturing effort. The heights of the individual elements in contact - connecting element, adapter piece and sealing ring - must be manufactured with a manufacturing tolerance of a few hundredths of a millimeter. When using a specific hot-work steel, for example, maintaining a tolerance of ± 0.03 mm has proven to be sufficient.

The overall heights to be achieved depend on the elasticity of the hot-work tool steel used. For diameters of the press disk from 6 inches to 25 inches, this design allows the smallest overall heights in the order of magnitude of 40 mm to 105 mm, if the overall height of the press disk is roughly the distance between the press surface and the press ram or an adapter piece of the press ram . In this case, connecting elements which protrude into the press ram or into an adapter piece of the press ram do not contribute to the overall height of the press disk in the context of this invention.

However, the mentioned structural heights of the press disk are not intended to represent a limitation of the invention, but the construction of the press disk according to the invention also brings about advantages in the case of greater overall heights, in particular during assembly and disassembly and the replacement of wear parts.

The connecting element used can be implemented in different ways, with all embodiments having in common that the retraction forces can be transferred to the sealing ring via the respective connecting element and the wear parts of the press disk can be mounted or dismantled from the front by rotating the sealing ring around the axis of rotation of the press disk are. In some possible embodiments of the According to the invention, the press disk comprises the connecting element, and the sealing ring is connected to the connecting element in such a way that rotating the sealing ring about the axis of rotation of the press disk causes the connecting element to rotate in the same direction about the axis of rotation of the press disk. In this way, depending on the direction of rotation, the connecting element can be secured or released against axial movement on the ram, and together with the sealing ring and the filler piece, the connecting element can also be mounted and dismantled on the ram from the front of the press disk.

The respective connecting element can have at least one step on its circumference with an essentially radially extending tensile surface, so that the retraction force of the ram can be transmitted via this tensile surface to the sealing ring via the connecting element. This has the advantage that the retraction force can be directed specifically to a specific surface of the sealing ring.

In a further embodiment, the adapter piece comprises the connecting element, and by rotating the sealing ring around the axis of rotation of the press disk, depending on the direction of rotation, the sealing ring on the connecting element can be secured or released against axial movement. As a result, the sealing ring and the filler piece can be mounted and dismantled on the press ram from the front side of the press disk, while the connecting element remains on the adapter piece and thus on the press ram. This embodiment makes it possible to further reduce the number of components that have to be fastened or loosened during assembly and disassembly of the press disk.

Both when the adapter piece and when the sealing ring is the connecting element include, it is provided according to the invention that the connecting element is a circumferential connecting web which protrudes into a corresponding, likewise circumferential recess in an opposite component. The filler piece is secured against axial movement on the sealing ring independently of this connecting element, and means for producing and releasing a fuse between the sealing ring and the adapter piece against axial movement are provided between the connecting web and the recess. The retraction force of the ram can also be transmitted to the connecting web and thus the sealing ring via these means.

The connecting web can thus be attached to the sealing ring or the adapter piece of the press ram, and the corresponding circumferential recess is attached to the respective other component in such a way that the connecting web protrudes into this recess when the press disk is installed. If the connecting web is provided on the sealing ring, the recess is therefore located in the adapter piece, while it is located in the sealing ring when the connecting web is attached to the adapter piece. Which of these two arrangements is selected can be made dependent on the dimensions of the press washer, since the connecting web can be provided on the sealing ring and the recess in the adapter piece, for example, if there would otherwise not be enough space for the recess in the sealing ring.

The means for producing and releasing a securing between the sealing ring and the adapter piece against axial movement can for example comprise a bayonet lock. At least two bayonet cams are provided on the outer and / or inner edge of the connecting web, while corresponding guide grooves for receiving these bayonet cams are provided on the outer and / or inner edge of the recess.

The press disk can thus be mounted or dismantled on the adapter piece by means of the bayonet lock by a simple plug-and-turn movement. The end face of the connecting web offers a sufficient area to be able to absorb the pressure forces during the pressing process, while the retraction movement of the press ram can be transmitted to the sealing ring via the bayonet cams. Furthermore, this embodiment with a circumferential connecting web and bayonet has the advantage that over it a floating mounting of the press disc can be achieved for all types of press disc.

Furthermore, the press disk can comprise an intermediate element which is arranged between radial surfaces of the sealing ring and the filler piece. At least one groove can be made in at least one pressure-loaded surface of this intermediate element. As an alternative or in addition to this, the intermediate element can consist of a material that has a lower hardness than the material of the filler piece and / or the sealing ring.

If the filler piece is floatingly mounted between the sealing ring and the connecting element, then the filler piece can preferably have a contact surface running essentially axially in the direction of the ram, adjoining its outer conical surface, which is opposite a contact surface of the sealing ring that runs in the same direction, the contact surface of the sealing ring on the latter Connected inner conical surface. The radial distance between these two contact surfaces is then preferably less than the radial distance between the inner conical surface of the sealing ring and the outer conical surface of the filler piece. This embodiment can in particular prevent the gap between the outer conical surface of the filler piece and the sealing ring from being disadvantageously reduced to zero, while a large gap may remain between the filler piece and the connecting element, which may not be necessary and also undesirable.

The invention also includes a pressing device which includes such a system according to the invention. Preferably, an anti-rotation device is provided between the sealing ring and the ram, which can be implemented in various ways. For example, the ram comprises an adapter piece and an outer ring running around it with two end faces, one end face of which is oriented in the direction of the sealing ring. The sealing ring is secured against rotational movement on the outer ring by means of at least one pin connection, and the other end face of the outer ring is oriented in the direction of a connecting surface of the adapter piece. This other end face of the outer ring and / or the opposite connection surface of the adapter piece have a groove section with a plurality of radial half-grooves, and a connecting pin can be introduced into at least two opposite half-grooves. Due to the receptacles for connecting pins provided on both sides of the outer ring, there is a sufficient number of positions in which the sealing ring can be secured against twisting with respect to the press ram, so that the press disk can be screwed onto the press ram as far as necessary without going through the possibilities of anti-twist protection to be disadvantageously limited.

A further advantageous protection against rotation consists in that a screw is screwed into the connecting element from the front side of the press washer, which screw has an opposite thread compared to the press washer and thus prevents the press washer from loosening.

Further advantages, special features and expedient developments of the invention emerge from the subclaims and the following illustration of preferred exemplary embodiments on the basis of the figures.

Fig. 1

eine Pressscheibe gemäß dem Stand der Technik

Fig.2

eine schematische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Systems in Verbindung mit dem Pressstempel einer Pressvorrichtung, wobei das Verbindungselement ein Verbindungssteg am Adapterstück mit Bajonettverschluss ist

Fig. 3

eine schematische Ansicht einer Abwandlung des Ausführungsbeispiels nach Figur 2;

Fig. 4

eine schematische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Systems in Verbindung mit dem Pressstempel einer Pressvorrichtung, wobei das Verbindungselement ein Verbindungssteg am Adapterstück mit Gewindeverbindung ist; und

Fig. 5

eine schematische Ansicht einer Abwandlung des Ausführungsbeispiels nach Figur 4.

From the pictures shows:

Fig. 1

a press disk according to the prior art

Fig. 2

a schematic view of an embodiment of a system according to the invention in connection with the ram of a pressing device, the connecting element being a connecting web on the adapter piece with a bayonet lock

Fig. 3

a schematic view of a modification of the embodiment according to Figure 2 ;

Fig. 4

a schematic view of an embodiment of a system according to the invention in connection with the ram of a pressing device, wherein the connecting element is a connecting web on the adapter piece with a threaded connection; and

Fig. 5

a schematic view of a modification of the embodiment according to Figure 4 .

Figure 1 shows an embodiment of the press disk from the prior art explained at the beginning. The press disc consists of a press disc core 5, on which a centering bolt 4 is used as a fastening means to screw a filler piece 3, which is conically outwardly shaped in a central area, into a nut 6 embedded in the press disc core 5, the filler having a press surface 16. The nut 6 is locked by a locking pin 7. The filler 3 surrounds a sealing ring 1, which is in turn an intermediate ring 2 is placed, which also surrounds the press disk core 5. A radial gap 3A is formed between the sealing ring 1 and the filler piece 3. Another support disk 9 is deposited on the intermediate ring 2. Parallel to the axis of rotation of the press disk indicated in the middle by the broken line, four bores 14 run through the support disk 9 at an angle of 90 ° and continue in the press disk core 5. The bores 14 widen in the front region of the support disk 9 and in the rear region of the press disk core 5 and each receive a centering pin 8. The bores 13 for keys for screwing on and unscrewing the press disk open into the bores 14 in the support disk 9. A tie rod, or connecting bolt 12, passes through the support disk 9 and the press disk core 5 along the axis of rotation. Behind the support disk 9 there is a press ram 11 which is also passed through by the tie rod 12. The ram 11 and the support disk 9 receive the locking pin 17 in a cavity.

If you want to replace the wearing parts in the form of the filler piece 3 and the sealing ring 1 in this press disk, it is necessary to loosen the centering bolt 4, the press disk core 5, the intermediate ring 2, the support disk 9, the fastening of the filler piece and all pin connections. The sealing ring must then be stripped off to the rear and a new sealing ring must also be fitted from the rear before the individual components can be re-fitted to the ram.

Furthermore, the overall height of this known press disc cannot be significantly reduced without impairing the functionality and thus negatively shortening the service life of the press disc, since each of the components used requires a certain structural height to absorb the tensile and compressive loads that occur and to function permanently fulfill.

Figure 2 shows an embodiment of the invention, in which the connecting element is a circumferential connecting web 110 which is attached to the adapter piece 21 of the ram 20. It is preferably a continuous connecting web in the form of a ring, which runs around the longitudinal axis of the press disk 10, but the connecting web can also be designed to be interrupted in sections. The connecting web is attached to that surface of the adapter piece 21 which faces the sealing ring 40 and protrudes into a corresponding circumferential recess 109 which is provided in the sealing ring 40. The connecting web 110 can be formed in one piece with the adapter piece 21 or as a separate component that can be fixed to the adapter piece.

The circumferential connecting web 110 and the recess 109 are essentially of the same shape, with a slight play between the connecting web 110 and the recess 109 in order to be able to rotate the two components relative to one another. In the in Figure 2 The illustrated embodiment, a plurality of bayonet cams are provided both on the outer edge and on the inner edge of the connecting web 110. In Figure 2 only one bayonet cam 111 on the outer edge and an opposing bayonet cam on the inner edge of the connecting web 110 are shown, although further bayonet cams are preferably arranged over the entire connecting web. For example, four bayonet cams can be provided on the outer and inner edges at a distance of 90 °. However, it is also possible to provide bayonet cams only on the outer or inner edge and the bayonet cams of the outer edge, in contrast to the illustration in FIG Figure 2 also be arranged offset to the bayonet cams of the inner edge.

The bayonet cams engage in guide grooves (not shown) which are made in the side walls of the recess 109. This is, for example, in each case a groove in the longitudinal direction and a transverse groove at the end of the longitudinal groove. Thus, the bayonet cams can be inserted into the longitudinal grooves and the connecting web 110 can be rotated at the end in such a way that the bayonet cams snap into the transverse grooves and further axial movement is prevented. A bayonet cam can be formed as an elevation of any shape on the circumference of the connecting web 110, the bayonet cam protruding approximately 2.5 to 15 mm from the connecting web 110. The bayonet cams are preferably formed by a circumferential ring with several interruptions, the areas between the interruptions forming the bayonet cams which can engage in correspondingly wide guide grooves in the recess 109.

In this embodiment, the filler piece 30 is connected to the sealing ring 40 with a connecting web, regardless of the selected connecting element. For example, this can be done by a fastening bolt 100 which is screwed into the filler piece 30 and the sealing ring 40 and is additionally secured against rotation by a pin connection 73, which is only shown in dashed lines. The front side of the fastening bolt 100 together with the filler piece 30 forms part of the pressing surface. The sealing ring 40 together with the filler piece 30 and the Fastening bolts 100 are screwed onto the connecting web 110 and secured against axial movement by the bayonet lock.

The rotation of the sealing ring 40 and thus the press disk 10 can also take place here via receptacles 91 which are located on the side of the sealing ring 40. At least one lateral pin connection 73 can be provided to prevent the pressing disk 20 from rotating with respect to the adapter piece 21, the pin used being in the in Figure 2 illustrated embodiment of the invention can be secured against falling out by a further screw 120.

In this embodiment, the retraction force of the press ram 20 can be transferred from the adapter piece 21 to the sealing ring 40 via the pulling surfaces 66 ″ in the area of the bayonet cams, while the compressive forces can be completely absorbed by the front surface of the connecting web 110 51 can also be discharged laterally over a short distance via the recess 109.

By choosing suitable dimensions and tolerances, it is possible that compressive forces, which are transmitted via the material to be pressed to the press disk, both via the end face of the connecting web 110, 110 'between the bayonet cams 111, 112, 111', 112 'on the corresponding surface in the recess 109, 109 ', as well as via the surface of the sealing ring facing away from the material to be pressed onto the surface of the adapter piece 21. In this context, connecting web 110, 110 'means an annular connecting element in the event that several bayonet cams 111, 112, 111', 112 'are attached to the connecting element, for example pointing inwards towards the center axis of the press disk 10 and outwards from the center axis of the press disk 10 understood, while in the case that bayonet cams 111, 111 'or 112, 112' are attached to the connecting element only inwardly towards the central axis of the press disk 10 or only pointing outward from the central axis of the press disk 10, a circular connecting element is understood. In addition, however, any other suitable form of the connecting element is also possible. A corresponding double fit can be produced as a function of the elasticity of the sealing ring 40 by maintaining a tolerance of a few hundredths of a millimeter, which is easily possible by using appropriate machine tools. For example, maintaining a tolerance of ± 0.03 millimeters when using a suitable hot-work steel for the sealing disk 40 has proven to be sufficient. Depending on Material pairing, occurring compressive forces and diameter of the press disc, it is sufficient if the surfaces are only partially in contact under pressure.

Alternatively, this embodiment can also according to Figure 3 can be modified and a circumferential connecting web 110 'can be formed on the sealing ring 40, while a corresponding recess 109' is located in the adapter piece 21 in order to receive the connecting web 110 'during assembly. Corresponding bayonet cams 111 'and 112' are formed on the connecting web 110 ', and here too the press disk 10 can be mounted or dismounted on the adapter piece 21 by means of a plug-and-turn movement. A rotation lock of the sealing ring 40 with respect to the adapter piece 21 could be realized here by at least one screw 120 which would be screwed into the adapter piece 21 and then into the connecting web 110 '. The coordination of the height dimensions of the areas of connecting web 110, 11 ', sealing ring 40 and adapter piece 21, 21', 21 "can be selected analogously to the previous embodiment.

In the Figs. 2 and 3 a double bayonet with bayonet cams 111, 112, 111 ', 112' is shown both on the inside and on the outside of the connecting web 110, 110 '. This does not constitute a restriction on other types of bayonet either. For example, it is also conceivable to provide a bayonet with bayonet cams 111, 111 'or 112, 112' arranged only on one side, which has advantages in terms of manufacturing technology.

This embodiment can be advantageous, for example, for smaller diameters of the press disk if there would not be enough space in the sealing ring 40 for a suitable connecting web without weakening the sealing ring 40 too much. Compared to the embodiment of FIG Figure 2 the total height of the press disk, but if you only look at the distance between the press surface and the adapter piece as the height, the height does not have to change. In this modification of the exemplary embodiment, the retraction forces can advantageously be transmitted via the tension surfaces 66 ″ in the area of the bayonet cams from the adapter piece 21 to the connecting web 110 ′ and thus the sealing ring 40.

Figure 4 shows an embodiment of the invention in which a connecting web 110 on the adapter piece 21 and a recess 109 in the sealing ring 40 have also been selected as the connecting element. However, a thread is used here as a means for producing and releasing a safeguard against axial movement between connecting web 110 and recess 109 provided so that the connecting web 110 is screwed into the recess 109. The retraction forces are transmitted via the thread, but the entire front surface of the connecting web 110 is available to absorb the compressive forces. To prevent rotation, an outer ring 80 and pin connections 71 and 72 can be used, as they are for Figure 3 have been explained. Air from the gap 51 can again be discharged laterally via ventilation channels 92.

Figure 5 FIG. 8 shows a modification of the embodiment of FIG Figure 4 , the structure as in the embodiment of Figure 3 was reversed, so that the connecting web 110 ′ is now attached to the sealing ring 40 and the recess in the adapter piece 21. Furthermore, the shape of the sealing ring 40 has been changed and made step-shaped towards the adapter piece 21, so that the connecting web 110 'and thus also the recess 109' are of different heights on their respective outer and inner edges.

In all embodiments, a sealing ring 40 can also be designed in two pieces, for example, the two partial pieces of the sealing ring then being connected to one another, for example, via a pin connection. The sealing ring 40 can also be formed from more than two parts which are connected to one another in such a way that rotating the outer part causes all parts connected thereto to rotate. This has the advantage that parts can be exchanged individually when worn, which is the case in particular for an outer part which includes the inner conical surface 41 and with this surface forms the gap 50 to the outer conical surface 31 of the filler piece.

In all of the illustrated exemplary embodiments of the invention, the sealing ring 40 has a greater overall height on the outside than on the inside, so that a step results between these areas of different overall height which opens into the support surface of the filler piece 30. At the transition between these two areas, an axial recess can be provided in the sealing ring in each embodiment. As a result of this puncture, the sealing ring 40 expands more easily at a defined point in time.

Furthermore, an intermediate element can be provided between the radial surfaces of the sealing ring 40 and the filler piece 30. This intermediate element has the advantage, for example, that the previously mentioned recess in the sealing ring 40 does not have to be made so deep, since this may not be possible for manufacturing reasons. Thus, a puncture with a shallow depth can be provided, the intermediate element but functionally enlarges the sealing ring in the direction of the filler piece 30 and then forms the radial gap 51 with the filler piece 30.

Such an intermediate element can, however, also be designed in such a way that its thickness is reduced or more strongly reduced than the thickness of the filler piece 30 and the sealing ring 40 when the pressure load continues during operation of the press disk and the sealing ring 40 is not disadvantageously reduced due to wear of these components, because the simultaneous reduction in thickness of the intermediate element would nevertheless always ensure a sufficient gap between the two components.

The targeted reduction in the thickness of the intermediate element can be achieved, for example, by an intermediate element made of a material with a lower hardness. As an alternative or in addition to this, a plurality of grooves or grooves could be provided in at least one pressure-loaded surface of the intermediate element, the height of which is reduced during operation of the press due to wear and pressure, which would reduce the overall height of the intermediate element.

If the filler piece 30 is mounted in a floating manner between the sealing ring 40 and a connecting element, measures may be necessary so that the gap 50 between the filler piece 30 and the sealing ring 40 is not disadvantageously reduced. For this purpose, the filler piece 30 can, for example, adjoining its outer conical surface 32, have a contact surface running essentially axially in the direction of the ram 20, which lies opposite a similarly extending contact surface of the sealing ring 40, the contact surface of the sealing ring 40 adjoining its inner conical surface 41. If the radial distance between these two contact surfaces is selected to be less than the radial distance between the inner conical surface 41 of the sealing ring 40 and the outer conical surface 32 of the filler piece 30, this leads to the two contact surfaces being contacted before the gap 50 between the filler piece and the sealing ring 40 reduced to zero. Otherwise it would be possible for the gap 50 to be reduced to zero, while a large gap remains between the filler piece 30 and the connecting element, which, however, might not be necessary and also undesirable.

List of reference symbols:

10

Press disc

20th

Press ram

21.21 ', 21 "

Adapter piece

30th

Filler piece

31

Outer conical surface

32

Pressing surface of the filler piece

40

Sealing ring

41

Inner conical surface

50.51

gap

66.66 ', 66 "

Pulling surface

71

Pin connection between sealing ring and outer ring

72

Pin connection between outer ring and adapter piece

73

Pin connection between sealing piece and adapter piece

80.80 ', 80 "

Outer ring

91

admission

92

Ventilation duct

100

Fastening bolts

110, 110 '

Connecting bridge

111.111 '

Bayonet nock outside

112.112 '

Bayonet nock inside

120

screw

(State of the art)

1

Sealing ring

2

Intermediate ring

3

Filler piece

3A

gap

4th

Centering bolt

5

Press disc core

6th

mother

7th

Locking pin

8th

Centering

9

Support disc

11

Press ram

12th

Connecting bolts, tie rods

13.14

drilling

16

Pressing surface

Claims (6)

1. A system of an extrusion plate (10) and an adapter piece (21) for assembly on an extrusion ram (20) of an extrusion device, wherein the extrusion plate (10) comprises at least one filler piece (30) comprising an extrusion surface (31), via which a force can be exerted on a material to be extruded, and the filler piece (30) is formed conically on the external diameter thereof with an outer conical surface (32) and is surrounded by a sealing ring (40), which likewise belongs to the extrusion plate and which is designed with the internal diameter thereof such that it forms a gap (50) with the inner conical surface (41) thereof and with the outer conical surface (32) of the filter piece (30), and at least one radial gap (51), which widens conically from the inside to the outside, runs between the filler piece (30) and the sealing ring (40), wherein the filler piece (30) and the sealing ring (40) can be assembled to the adapter piece (21) via a connecting element (110; 110'), and the retraction force of the extrusion ram (20) can be transferred to the sealing ring (40) via the connecting element (110; 110'),
   characterized in
   that the filler piece (30) is connected to the sealing ring (40) and is secured against an axial movement at the sealing ring (40),
   that the connecting element (110; 110') is a circumferential connecting web (110; 110'), wherein the connecting web (110; 110'), which is optionally interrupted in some sections, runs around the longitudinal axis of the extrusion plate (10), and wherein either the connecting web (110) is attached to the adapter piece (21) and protrudes into a corresponding circumferential recess (109) in the sealing ring (40), or the connecting web (110') is molded to the sealing ring (40) and protrudes into a corresponding circumferential recess (109') in the adapter piece (21),
   that there is a small play between the connecting web (110; 110') and the recess (109), in order to be able to rotate the two components against each other,
   that a rotation of the sealing ring (40) and thus of the extrusion plate (10) can take place via receptacles (91), which are located laterally at the sealing ring (40), that either bayonet cams (111, 112, 111', 112') are provided, which engage with guide grooves, wherein a retraction force of the extrusion ram (20) can be transferred from the adapter piece (21) to the sealing ring (40) via tensioning surfaces (66') in the region of the bayonet cams (111, 112, 111', 112'), while compressive forces can be absorbed by a front surface of the connecting web (110), or that the connecting web (110, 110') is screwed into the recess (109; 109'), wherein a retraction force of the extrusion ram can be transferred via the thread, yet the entire front surface of the connecting web (110, 110') is available for absorbing the compressive forces.
2. The system according to claim 1, characterized in
   that air can be laterally discharged from the radial gap (51) through ventilation ducts (92).
3. The system according to any one of the preceding claims, characterized in that bayonet cams (111, 112, 111', 112') are formed by a circumferential ring comprising several interruptions, wherein the regions between the interruptions form the bayonet cams, which can engage with guide grooves, which are embodied to the correspondingly wide, in the recess (109).
4. The system according to any one of the preceding claims, characterized in that the bayonet cams (111, 112, 111', 112') are arranged on the inner as well as on the outer side of the connecting web (110; 110').
5. The system according to any one of claims 1 to 3, characterized in that a bayonet is provided comprising bayonet cams (111, 111', or 112, 112'), which are only arranged on one side.
6. An extrusion device, characterized in that it comprises an extrusion ram and a system according to any one of the claims 1 to 5.

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