EP0388721B1 - Press with tool frame insertable into the press - Google Patents

Abstract

In a press having an upper punch and lower punch and a tool mount to be inserted into the press and connected to the lower punch via a lower coupling plate and to the upper punch via an upper joining piece, and a framework mounted displaceably on a base plate of the mount and consisting of connecting rods rigidly connecting the lower coupling plate with the matrix holding plate, die carriers being moved relative to the base plate from their filling position downward into the compacting position and from the compacting position into the ejecting position, which corresponds to the filling position (the so-called ejection method), at lease one additional die carrier, like the matrix holding plate, works by the withdrawal method, this die carrier being moved from the filling position downward into the compacting position and from the compacting position downward into the withdrawing position.

Description

The invention relates to a press according to the preamble of claim 1, in particular a press for the production of compacts from powdery material, with an upper bear and lower bear and a multi-plate system designed as an adapter unit, which can be installed and removed in a tool frame in the press.

Such a press with a multi-plate adapter is already known (DE-A 31 42 126). This press can be moved from a base plate that is fixed in relation to the press from three stamp carrier plates via hydraulic piston / cylinder units, all of which work in the ejection process, ie are moved from the filling position down to the press end position and from the press end position up to the ejection position. This method of operation requires that all piston / cylinder units as drive systems for the stamp carrier plates working according to the ejection process are concentrated within the tool frame and essentially shifted in the base plate. All piston / cylinder units assigned to the stamp carrier plates must also be designed in accordance with the required ejection force which must be applied in order to demold the compact after the die holding plate has been moved down into its pull-off position without the force being introduced via the upper bear or the lower bear, that is to say the force applied by the press itself.

In presses operating according to the withdrawal process, in which stamp carrier plates are also moved in the withdrawal position with the die holding plate, the path which both the die holding plate and the stamp carrier plates have to cover from the filling position to the pressing end position and the further downward movement into the withdrawal position is comparatively long , which leads to press parts with relatively large installation heights. Apart from this, a complicated mechanism is required in order to move the sliding devices, which support the stamp carrier plates relative to the press frame in the press end position, laterally in order to provide space for the downward movement of the stamp carrier plates into the pull-off position. This is also associated with a corresponding control effort.

The object of the invention is to provide a press with a very compact tool frame that can be used as an adapter unit in the press for the production of stepped compacts from powdery material, which can be converted without great effort for the production of different stepped compacts.

This object is achieved according to the invention by the features contained in the characterizing part of patent claim 1, expedient further developments being characterized by the features contained in the subclaims.

According to the invention, a tool frame is created in which the structure of a tool frame designed as an adapter unit is designed so that both according to the Ejection process working stamp carrier plates as well as stamp carrier plates working according to the withdrawal process are integrated. This allows a wide variety of stepped compacts of different shapes to be produced, the particular advantage being that the tool frame can be kept extremely compact in terms of its width dimensions and its installation height. With such a structure, the piston / cylinder units required for moving the stamp carrier plates into the ejection position are reduced, which otherwise have to be displaced within the tool frame, in particular on the base plate.

Advantageously, the stamp carrier plate, ie the trigger plate, which works in the trigger process is designed such that at least one of the ejection plates is optionally arranged above or below the trigger plate. In this context, it is expedient to provide the trigger plate with through openings for the passage of the movement pistons of at least one ejection plate.

The movement of the trigger plate from the pressing position into the trigger position is expediently coupled with the movement of the lower bear, in that existing, otherwise adjustable stops on the die plate come into abutment against the trigger plate. It is expedient here that at the same time as the die holding plate moves downward, slides are moved away laterally via corresponding stops, so that a space is created below for the downward movement of the pull-off plate into the pull-off position. Furthermore, it is expedient to couple the trigger plate with the movement of the upper bear via push rods in order to move the trigger plate from the filling position into the pressing position. These push rods are expediently designed to be adjustable.

In order to avoid that after reaching the pressing end position of the take-off plate, press components are damaged in that the upper bear of the press moves further down, the push rods act on stops of the trigger plate, which are supported by pressure medium cushions against the trigger plate, which can be adjusted by means of an outlet valve by releasing pressure medium via the outlet valve.

By interposing spacers, it is possible to shift one of the stamp carrier plates working in the ejection process upwards, i.e. to be arranged above the fume cupboard. Without these spacers, this stamp carrier plate is arranged below the trigger plate. These spacers reach through corresponding openings in the trigger plate. In this way, a wide variety of differently graduated compacts can be produced, with rapid changeover being ensured.

Fig. 1

eine schematische Ansicht, teilweise im Schnitt, eines Werkzeuggestells, bei dem die im Ausstoßverfahren arbeitenden Stempelträgerplatten unterhalb der Abzugsplatte angeordnet sind,

Fig. 2 + 3

Schemaansichten zur Darstellung des Funktionsprinzips der Presse nach Anspruch 1,

Fig. 4

ein Ausführungsbeispiel, bei dem eine nach dem Ausstoßverfahren arbeitende Stempelträgerplatte oberhalb der Abzugsplatte angeordnet ist,

Fig. 5 + 6

Schemaansichten zur Erläuterung des Funktionsprinzips der Presse bzw. des Pressenteils nach Anspruch 4,

Fig. 7a

eine Ansicht verschiedener gestufter Preßlinge, die mit der Presse nach Figur 4 bis 6 herstellbar sind sowie

Fig. 7b

zwei Ansichten von Beispielen von Preßlingen, die mit dem Pressenteil nach den Fig. 1 bis 3 herstellbar sind.

Preferred exemplary embodiments of the invention are described below with reference to drawings. Show in it

Fig. 1

1 shows a schematic view, partly in section, of a tool frame in which the stamp carrier plates working in the ejection process are arranged below the trigger plate,

Fig. 2 + 3

Schematic views to illustrate the functional principle of the press according to claim 1,

Fig. 4

an embodiment in which a stamp carrier plate working according to the ejection process is arranged above the trigger plate,

5 + 6

Schematic views for explaining the functional principle of the press or the press part according to claim 4,

Fig. 7a

a view of various stepped compacts that can be produced with the press of Figure 4 to 6 and

Fig. 7b

two views of examples of compacts that can be produced with the press part according to FIGS. 1 to 3.

The embodiment explained with reference to FIGS. 1 to 3 comprises a base plate denoted by 1, which is fixed and fixed to the press after the installation of the tool frame. In this base plate 1, a framework is slidably guided, which is constructed from a lower coupling plate 2 and a die holding plate 3, which are rigidly connected to one another via tie rods 4. The sliding guidance of the framework in the base plate 1 takes place via the tie rods 4.

The lower coupling plate 2 is coupled or connected to the lower bear or lower bear of the press. The tool frame is connected to the upper bear of the press via an upper connecting piece 5. In the exemplary embodiment shown, this connecting piece 5 is displaceable on guide rods 6 which are firmly connected to the die holding plate 3. In an alternative embodiment, the guide rods 6 can be displaceable relative to the die holding plate 3, the upper connecting piece 5 then being firmly connected to the guide rods 6.

Starting from the base plate 1, a stamp carrier 7 can be moved, which works in the ejection process, that is to say can be lowered from the filling position into a pressing position and can be moved from the pressing position into an ejection position which corresponds to the filling position. The movement of the stamp carrier 7 relative to the base plate 1 takes place via two piston / cylinder units 8, which are preferably acted upon hydraulically, but also like the piston / cylinder units described below could also be operated pneumatically. The pistons 9 of the piston / cylinder units are guided in cylinders 10 of the base plate 1 and act on a plate 11 which is part of the stamp carrier 7.

A further stamp carrier 12 can be moved from the base plate 1 by two piston / cylinder units 13, the pistons denoted by 14 being guided in cylinders 15 which are formed in the base plate 1. The stamp carrier 12, also referred to below as a bridge, works in the same way as the stamp carrier 7 in the ejection process. For the sake of simplicity, the stamp carriers 7 and 12 are therefore referred to below as ejection plates.

In contrast, the third punch carrier 16 works in the withdrawal process as well as the die holding plate 3, which is raised to the filling position by the lower bar of the press, not shown, as a result of the coupling with the lower coupling plate 2 via the pull rod 4, is moved down from the filling position during the pressing process and is controlled after the upper punch has been lifted off the compact, it is moved further downward through the lower bear until the compact designated by 17 in FIGS. 2 and 3 is released. In Fig. 3 the trigger position is shown on the right.

The stamp carrier 16, also referred to below as the trigger plate 16, is displaceable relative to the base plate 1, although in the exemplary embodiment shown the cylinders 18 of the two piston / cylinder units 19 are formed in the trigger plate 16 itself. The lower ends of the pistons 20 are connected to the base plate 1. However, a kinematic reversal is also possible, so that the corresponding pistons 20 are mounted in corresponding cylinders of the base plate 1, in which case the upper ends of the pistons 20 would be firmly connected to the stamp carrier or the trigger plate 16.

Another stamp carrier 21, which is stationary with the base plate 1 (compare embodiment according to FIG. 4), sits on the base plate 1.

The filling position of the stamp carrier 7 working in the ejection process is limited by nuts 22 which are arranged on the plate 11 and come into abutment on the underside 23 of the base plate 1. The nuts 22 are adjustable relative to one another in order to ensure that the stop can be adjusted. The pressing position of the ejection plate 7 is defined by a shoulder 24 in contact with an inner bore of the base plate 1.

The filling position of the ejection plate 12 is defined by an adjustable stop ring 25 which strikes the underside 23 of the base plate 1 in the filling position and which is shown enlarged in detail in FIG. 1a. The pressing position of the trigger plate 12 is evident from the alternative embodiment according to FIG. 4, namely from the detail according to. 4a, according to which a corresponding stop 26 with a grindable plate 27 is arranged on the base plate 1, against which the pistons of the trigger plate 12 strike with their lower ends.

The filling position of the trigger plate 16 is defined by stops on the trigger plate 16 which cannot be seen from FIG. 1, a threaded rod which can be screwed relative to the base plate 1 being provided for the purpose of adjustment and which has a head as a stop shoulder, the movement of the trigger plate 16 and thus the filling position Are defined. In the pressing position, the trigger plate 16 is pressed over the powder column and is also supported here with respect to the base plate 1 via a stop 41, as can be seen from FIG. 4 and also from FIG. 1b. Alternatively, the trigger plate 16 can also be moved from its filling position into the pressing position are that adjustable stops 28, which are attached to the upper connector 5 via rods 29, act on rods 30, in particular press, which are connected via a pressure medium cushion 31 to the trigger plate 16.

Since the movement of the trigger plate 16 from the filling position to the pressing position coupled with the movement of the upper connector 5 over the upper bear of the press, pressure medium can be discharged from the cylinder 32 for the pressure medium cushion 31 via an outlet valve, not shown, if the trigger plate 12 is their Press position has already been reached before the upper bear reaches the press position. Otherwise the downward movement of the upper bear would be prevented by the pressure medium cushion 31, which can lead to the destruction of press components.

The movement of the die holding plate 3 into the filling position takes place via the movement of the lower bear as a result of the coupling of the framework with the lower coupling part 2. During the pressing process, the female holding plate 3 is brought down in a controlled manner, again as a result of the coupling with the lower bear via the framework, whereby the die holding plate 3 is supported in the press end position in the press, namely via the lower bear.

During the pull-off movement of the die-holding plate 3, two slides are moved laterally outwards, of which the right slider can be seen in detail according to FIG. 1b and is identified by the reference number 33. This lateral movement of the slide 33 is achieved in that when the die holding plate 3 is moved into the pull-off position on the die holding plate 3, adjustable stops 34 press on a movable wedge 35 mounted in the pull-off plate 16, which pushes the slide 33 laterally outwards, so that the way down for the deduction plate 16 is free, which is brought into the pull-off position in connection with the downward movement of the die holding plate 3. As soon as the path for the trigger plate 16 is free due to the slides 33 moved away, the trigger plate 16 is brought into the trigger position with the further downward movement of the die holding plate 3 via the stops 34.

2 and 3, the movement of the individual stamps from the filling position into the pressing position and from the pressing position into the ejecting position and into the withdrawal position of the die holding plate is shown. Here, the stamp 36 is supported on the ejection plate 7, the stamp 37 on the ejection plate 12 and the stamp 38 on the trigger plate 16. From FIGS. 2 and 3 as well as from FIGS. 5 and 6, upper punches for shaping the upper surface of the compacts 17 emerge, which are mounted on the upper connecting piece, but cannot be described here in greater detail.

As can be seen from a comparison of FIG. 3 on the left and on the right, after pressing the compact 17, the die holding plate 3 is brought down into the withdrawal position until the die holding plate 3 releases the compact 17. At the same time, the die 38 on the take-off plate 16 is brought into the pull-off position with the die-holding plate 3, after which the dies 36 and 37 are moved into the eject position in order to release the compact 17, as can be seen on the right in FIG. 3.

With the described embodiment according to FIGS. 1 to 3, stepped compacts can be produced according to the shape shown in FIG. 7b. If, on the other hand, stepped compacts are to be made from powdery material in accordance with the contours shown in FIG. 7a, this is done with a press or a tool frame according to the embodiment according to FIGS. 4 to 6. For this purpose, only the tool frame needs to be converted such that the with 12 designated stamp carrier is stretched or extended such that the ejection plate 12 receiving the stamp 37 is arranged above the trigger plate 16. According to the embodiment according to FIG. 4, this is done by interposing spacers or spacer rods 39 which are screwed to the upper ends of the pistons 14 of the piston / cylinder units 13. The spacers 39 and the pistons 14 of the ejection plate 12 are guided through corresponding holes in the trigger plate 16. In this embodiment, the trigger plate 16 is thus below the discharge plate 12, so that it can be moved freely from the discharge plate 12 down into the trigger position. In the embodiment according to FIGS. 4 to 6, the same reference numerals have been used for the same components as in the embodiment according to FIGS. 1 to 3.

Claims (15)

1. A press with an upper rammer and a lower rammer and a tool frame insertable into the press, which is attachable via a lower coupling plate (2) on the lower rammer and an upper connecting piece (5) on the upper rammer, and comprising, on a base plate (1) of the frame, an adjustable framework made up of tie-rods (4), which rigidly link the lower coupling plate (2) with the matrix holding plate (3), whereby die-holders (7, 15) opposite the base plate (1) are directed from their fill position downwards into the press position and from the press position upwards into the eject position which corresponds to the fill position (so-called ejector mode), whereby the matrix holding plate (3) travels downwards from the press position into the impression position, characterised in that at least one additional die-holder (16) operates in impression mode and is directed downwards from the fill position into the press position and from the press position downwards into the impression position.
2. A press according to claim 1, characterised in that the die-holding plate (16) - so-called impression plate - working in impression mode, is configured in such a way that at least one die-holding plate - so-called ejector plate - working in ejector mode, is positioned optionally above or below the impression plate (16).
3. A press according to claims 1 or 2, characterised in that the impression plate (16) shows openings for the passage of the moving pistons (14) of the ejector plate (12).
4. A press according to one of the preceding claims, characterised in that the impression plate (16) is conveyable via adjustable stops (34) on the matrix holding plate (3) from the press and into the impression position.
5. A press according to claim 4, characterised in that the impression plate (16) is supported in press position via a stop (41) located on the base plate and also via laterally retractable sliding locators (33) opposite the base plate (1), whereby the sliding locators (33) are laterally retractable through the stops (34) on the matrix holding plate, so that the way is clear for the impression plate in the impression position.
6. A press according to claim 5, characterised in that the holding stop (41) for the impression plate (16) in press position opposite base plate (1) is configured as being adjustable and located on the base plate (1).
7. A press according to one of the preceding claims, characterised in that the impression plate (16) is moveable from the fill position into the press position through push-rods (28, 29) linked with the movement of the upper rammer.
8. A press according to claim 7, characterised in that the push-rods (28, 29) are configured as adjustable and located on the upper connecting piece (5) of the tool frame.
9. A press according to claims 7 or 8, characterised in that the push-rods (28, 29) press down on to stops (30) of the impression plate (16), which are supported via a pressure buffer (31) opposite the impression plate (16).
10. A press according to claim 9, characterised in that the cylinders (32) containing the pressure buffers (31) in the impression plate (16) show a pressure valve to protect the component parts of the press during any further movement of the upper rammer after reaching the press completion position through the impression plate (16).
11. A press according to one of the preceding claims, characterised in that on the base plate (1) a further fixed die-holder (21) is located.
12. A press according to one of the preceding claims, characterised in that the ejector piston of the centrally located die-holder (7) is provided with a borehole (40) for the passage of a further die.
13. A press according to one of the preceding claims, characterised in that the ejector plates (7, 12) when in the fill position opposite the base plate (1) are confined by adjustable stop-washers (22) or (25).
14. A press according to one of the preceding claims, characterised in that the impression plate (16) when in the fill position is confined by adjustable stops.
15. A press according to one of the preceding claims, characterised in that two spacers (39) are used for locating the ejector plate (12) above the impression plate (16) and that these spacers (39) or the ejector plate (12), in the event of them being located beneath the impression plate (16), are set upon re-seatable plates (27) on the base plate (1) when in the press position.

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