EP3697627A1

EP3697627A1 - Stamping press and method for stamping a round blank

Info

Publication number: EP3697627A1
Application number: EP18782952.8A
Authority: EP
Inventors: Simon KNEER
Original assignee: L Schuler GmbH
Current assignee: L Schuler GmbH
Priority date: 2017-10-17
Filing date: 2018-10-02
Publication date: 2020-08-26
Also published as: CN116000172A; US11453039B2; JP2020536748A; US20200238356A1; CN111465506A; WO2019076628A1; JP7243720B2; DE102017124148A1

Abstract

The invention relates to a stamping press for stamping a round blank (14). A ram (11), which can be moved in a stroke direction (H) and in a return stroke direction (R) opposite to the stroke direction (H), bears a first stamping tool (13). A second stamping tool (15) is mounted on a press framework (16). Also arranged on the press framework (16) is a stamping ring (22). The stamping tools (13), (15) and a stamping opening (23) formed by the stamping ring (22) are arranged in line along a working axis (A). An ejector device (30) serves for ejecting a stamped blank (14) from the ring opening (23) of the stamping ring (22). It has an ejector pin (31), which supports itself on an actuating device (32). The actuating device (32) is connected in terms of movement to the ram (11). When there is a return stroke of the ram (11), the ejector pin (31) can support itself on the actuating device (32) and exert a force on the second stamping tool (15) in the return stroke direction (R), in order to press the blank (14) out of the stamping ring (22). When there is a movement of the ram (11) in the stroke direction, the actuating device (32) comes away from the second stamping tool (15) in such a way that the ejector pin (31) does not exert any force on the second stamping tool (15) in the return stroke direction (R) and the second stamping tool (15) can assume the stamping position (P).

Description

Embossing press and method for embossing a blank

The invention relates to a stamping press and a method for embossing a blank using the stamping press.

The stamping press has a drive means of a plunger ^¬ drivable ram. At the plunger sits a first stamping tool. A second embossing tool works together with the first embossing tool. During the passage Prägevor ^¬ a Ronde to be embossed is located within an embossing ring, which limits the radial expansion of the blank at the pre ^¬ gene, thus defining the radius and the circumference of the blank. From the ferrule the embossed Ronde must be ejected at ^¬ closing. For this purpose, an ejector is provided which beauf ^¬ strike the second embossing tool to auszuwer ^¬ fen, the embossed blank from the die ring.

Such embossing press is known from EP 0 151 204 AI. To drive the ejector bolt, a lever ^¬ gear is present. A push rod is hinged at one end to the plunger and at another end to a lever. The lever is pivotally mounted on the press frame. The ejector pin is mounted in the middle of the lever. By the movement of the push rod together with the plunger pivots the lever and thus the ejector.

A disadvantage of such embodiments of the coupling of the plunger with the ejector is that the stroke of the ejector is determined by the lever mechanism and the stroke of the plunger. It is difficult rig to adjust the stroke of the ejector so that on the one hand ensures a safe ejection of the embossed blank and on the other hand, a fault-free feeding of the blank is made possible in the stamping ring to emboss the blank.

It can therefore be regarded as an object of the present invention to provide an improved embossing press or an improved method for embossing a blank, which avoids the aforementioned disadvantages.

This object is achieved with a stamping press according to claim 1 and a method according to claim 11.

According to the invention, the embossing press on a Stö ^¬ ßel, which is movable by means of a plunger drive in a Hubrich ^¬ tion and against the stroke direction in a return stroke. The plunger is guided linearly along a working axis. At the plunger, a first embossing tool is arranged. A second embossing tool is arranged on a press frame. The two embossing tools work together to emboss a blank. There is also an embossing ring adapted to enclose the blank during embossing. The stamping ring is arranged on the press frame. Through the embossing ring, the expansion of the blank during embossing is radially or angularly very ^¬ limited to the working axis. The stamping ring, so to speak, predetermines the circumference of the embossed blank. The inner recess of the stamping ring does not have to be circular, but can also have any other contours, for example polygonal contours, if polygonal coins, medals or other rounds are to be embossed. The stamping press also has an ejector ^¬ direction with an ejector. The ejector is adapted to pressurize the second embossing tool for Auswer ^¬ fen an embossed round blank out of the die ring in the return stroke direction when the finished embossed blank is to be pushed out of the die ring and ejected.

The stamping press has a connection device which is set up for the connection or coupling of the ejector pin with the plunger. The connecting device has an actuating device supporting and / or supporting the ejector pin and at least one connecting rod. The connecting rod connects the plunger and the Be ^¬ actuation device and coupled to each other such - and preferably without translation - that the lifting movement of the plunger is identical to the lifting movement of the actuator. In a preferred embodiment, only a single connecting rod is present. The connecting ^rod and the actuating device are designed such that the ejector pin does not act on the second embossing tool in the return stroke direction before the second embossing tool has reached an embossing position when the plunger is moved in the stroke direction by means of the plunger drive for embossing the blank. Preferably, the length of the at least one connecting rod in the lifting or Rückhubrichtung be changed, for example, to be able to compensate for changes occurring during operation, such as wear.

By this configuration, the second embossing tool can move into the embossing position without passing through the Ejector bolt to be prevented. This can ensure that the stamping operation, during which the first stamping tool presses the blank against the second embossing ^¬ imaging, and only then takes place when the second embossing ^¬ tool has reached the stamping position and the first pre ^¬ gewerk generating a corresponding counter-holding force entgegenge sets ^¬ , Is a Ronde to be embossed on the at-in the pre ^¬ geposition second embossing tool, which blank is enclosed by the ferrule in the circumferential direction. The round plate can be safely inserted into the stamping ring.

After the embossing process, during a Rückhubbewe ^¬ tion of the plunger in the return stroke, the ejector pin can move the second embossing tool in the return stroke and thereby eject the embossed blank from the embossing ring.

It is advantageous if a coupling device is arranged between the Actu ^¬ supply device and the ejector. The coupling device can be switched between a coupling position and a decoupling position. The coupling device is adapted to establish a coupling between the actuating device and the ejector for the movement in the return stroke in the coupling position and decouple in the end coupling position movement of the actuator in the return direction of the ejector, so that the ejector does not interfere with the ^¬ operation in Return stroke direction moves. By means of the coupling device can thus be avoided in a return stroke of the plunger in Rückhubrichtung ejecting a blank from the stamping ring. The second embossing tool remains in its embossing position and the blank remains in the embossing ^¬ ring. As a result, the first stamping tool can produce several stamped run be in the same blank before the blank is closing ^¬ Lich ejected from the coin ring.

It is preferred if the coupling device has a first coupling part coupled to the actuating device, a second coupling part coupled to the ejector pin and a coupling drive. By means of the clutch actuator can be at least a two Kupp ^¬ lung parts are moved the to switch the coupling means between the coupling position and the decoupling position. Preferably, one of the two clutch ^¬ parts is moved linearly by means of the clutch drive, in ^¬ example transverse or perpendicular to the stroke direction or to Rückhubrichtung. The clutch drive may include an electric motor. The clutch drive may comprise a linear motor or a pneumatic cylinder or a hydraulic cylinder. One of the coupling parts, which is connected to the clutch ^¬ drive, can be designed as a comb slider, while the other coupling part bil ^¬ det a counter comb. It is further preferred if only one of the two coupling parts is movable by the clutch drive and the respective other coupling part is arranged immovable transversely to the stroke direction and the return stroke direction.

Preferably, in a predetermined range of movement of the plunger between the two coupling parts, a gap or a game, wherein the second embossing ^¬ tool is in this predetermined range of movement of the plunger in the stamping position.

It is also advantageous if the Actu ^¬ supply device has a lever arrangement. The lever arrangement preferably has a first lever and a second lever Lever. In one embodiment, only two levers, namely the first lever and the second lever are present. The first lever and the second lever are hinged together at a hinge point. Preferably, the first lever on a press frame of the embossing press is articulated ^¬ supported. This first support point may be at the location of the hinge ^¬ opposite side of the first lever be disposed.

In a preferred embodiment, the ejector is coupled to the first lever at a first coupling point. The first coupling point is arranged in a transverse direction at a distance from the hinge point. The transverse direction is aligned at right angles to the stroke direction or to the return stroke direction.

It is also advantageous if the at least one connecting ^rod and preferably exactly one Ver ^{¬ connecting} rod is coupled to a second coupling point on the second lever. The second coupling point has Qu ^¬ establishing a distance from the hinge point.

The distance from the hinge point to the first Kopp ^¬ discharge point in one embodiment is the same size as the distance from the hinge point to the second Kopp ^¬ discharge point.

In a preferred embodiment, the second embossing tool is in its embossing position on a stop of the press frame such that a movement of the second embossing tool is prevented in the stroke direction by the stop. It is also advantageous if the second embossing tool by means of a biasing device is urged into the embossing position. Without acting from the off ^¬ thrower bolt force, the second embossing tool ^¬ retains the embossing position.

An overload safety device can be arranged on the actuation device, which operates in particular fluidically and preferably pneumatically. Overload protection device, the excess can work purely mechanically and be configured for example with a linear mecha ^¬ African overload clutch without fluids. The overload safety device limits the force that can be transmitted between the actuating device and the ejector bolt. This avoids that too high forces are transmitted from the ejector bolt to the second embossing tool in a clamping of the embossed blank in the embossing ring. A direction flui ^¬ disch or hydraulically operating Überlastsicherungsein- can ensure a quick release.

The overload protection device may be connected to the second lever of the lever arrangement.

In one embodiment, the Überlastsi ^¬ cherungseinrichtung has a fluid space which is filled with a fluid and in particular air or another gas. The fluid space may, for example, be present in a bellows (pneumatic bellows or gas bellows). Preferably, the fluid ^¬ space is filled with a predetermined fluid pressure. If there is in the fluid chamber, air or another gas, is achieved by the compressibility of the air or other gas, that the transmittable force between the Actuate the ^¬ restriction device and the ejector is limited.

Preferably, the overload protection device and in particular the fluid space or the air or gas bellows gekop ^¬ pelt at a second support point with the second lever. The support point between the overload safety device and the second lever is preferably arranged in the transverse direction at a distance from the articulation point. In a preferred embodiment, the first and the second support point each have the same distance from the Gelenkstel ^¬ le. The lever length of the second lever between the second support point and the hinge point and the lever length of the first lever between the first support point and the hinge point may be the same length. As long as the force acting on the ejector is below a threshold value, the overload protection device supports the second lever with respect to the press frame substantially rigidly. Is a threshold value of force is exceeded, the overload protection device yields and the second lever can move on the support point between the overload Siche ^¬ approximating means and the second lever. This avoids an excessive increase of the force on the ejector.

[0024] The preferably with a gas (eg air) processing tends ^¬ overload protection means limits the force acting on the ejector force due to the compressibility of the gas. The fluid chamber can for example be closed or be connected to a regulated gas pressure source without ^¬ pressure or safety valve against the environment. It can thereby be ensured that there is always a predetermined fluid pressure in the fluid space when the overload protection device is not triggered.

As an alternative to the embodiment described above, the overload protection device can be provided in In another embodiment, use a liquid as a fluid. For example, a hydraulic oil and preferably the transmission oil of the stamping press. In this embodiment, the fluid space may be limited on one side by a movable piston. The ejector pin can be indirectly supported on the movable piston. The fluid space may be fluidly connected to a safety valve. The Si ^¬ safety valve is configured to limit the fluid pressure in the fluid chamber. If the fluid pressure exceeds a threshold value, the safety valve is opened and the fluid can flow out of the fluid space. The piston therefore can no longer rest on the fluid and moves relative to a cylinder in which the fluid space is formed. The relative movement which the piston performs in the pressure reduction in the fluid space is preferably at least as great as the stroke of the plunger or of the carrier. Thus, no ejector force can be transmitted to the second embossing tool via the ejector pin.

It is advantageous if a first Federeinrich ^¬ device is present. The first spring means may preferably force from the second embossing tool away ^¬ the ejector.

Advantageous embodiments of the stamping press and the method emerge from the dependent patent claims ^¬ chen. Hereinafter, preferred embodiments of the invention will be explained in detail with reference to the accompanying drawings. Show it:

Figures 1-4 each have a highly schematic block diagram similar representation of a Ausführungsbei ^¬ game of a stamping press with an ejector in a partially cut side view,

[0029] Figure 5 is a side view ^of an exemplary ^embodiment of a stamping press,

6 is a partial sectional view of the ejector of the stamping press of Figure 5,

7 is a sectional view of an embodiment of a coupling device of the stamping press of Figures 5 and 6,

[0032] Figures 8 and 9 are each a schematic block diagram ^¬ similar view of the embodiment ei ^¬ ner coupling means,

[0033] Figures 10-13 are each a highly schematic block diagram similar representation of a further embodiment of an exporting ^¬ approximately embossing press with a Auswerfervor ^¬ direction in a partially sectioned side view,

14 is a partial perspective view of another embodiment of an ejector,

Figure 15 is a partial sectional view of the ejector of Figure 14 and

Figure 16 is a partial sectional view of the ejector according to Figures 14 and 15, wherein in particular a coupling device of the ejector is shown. An embodiment of an embossing press 10 according to the invention is highly schematically illustrated in the block diagram ^¬ image-like representations of Figures 1-4, in a perspective view in Figure 5 and in the partial views of Figures 6 to 9. The embossing ^¬ press 10 has a plunger 11 which is linearly movable by means of a Stö ^¬ ßelantriebs 12 along a working axis A. The plunger 11 can be moved parallel to the working axis A in egg ^¬ ner stroke direction H and opposite to the stroke direction H in a Rückhubrichtung R.

On the plunger 11, a first embossing tool 13 is arranged. The first embossing tool 13 may also be referred to as embossing ^¬ stamp. The first embossing tool 13 ar ^¬ beitet together for embossing a blank 14 with a second embossing tool 15th The round plate may be a coin, a medal or the like. The Ronde 14 may have any outer geometry and example ^{¬ be} circular or polygonal. The circular blank 14 can also be formed from a plurality of tubular parts, for example a circular core and at least one circular ring enclosing the circular core.

The second embossing tool 15 is mounted on a press ^¬ frame 16, which is shown only highly schematically in Figures 1-4. The embossing tool 15 may be arranged on a tool carrier 17, which is mounted on the press frame 16. The tool carrier 17 can be moved linearly ge ^¬ jointly with the second stamping tool 15 between an embossing position P (Figure 1) and an ejection position E (Figure 2). At the press frame 16, a biasing means 18 is arranged, which biases the second embossing ^¬ tool 15 in the stamping position P or urges. In the stamping position P, the second embossing tool 15 is supported, for example, indirectly via the tool carrier 17 against a stop 19 of the press frame 16. The stopper 19 may be designed, for example, as a ring step coaxial to the work ^¬ axis A or in any other way. By the biasing force of the biasing means 18, the second embossing tool 15 and, for example, the Werkzeugträ ^¬ ger 17 is pressed in the stroke direction H against the stop 19. In the stamping position P, the second stamping tool 15 can not move further in the stroke direction H along the working axis A. An applied by the ram 11 and the first stamping tool 13 to the blank 14 embossing force is thus abge ^¬ based on the second embossing tool 15 on the press frame sixteenth The blank 14 can be formed for embossing.

The biasing means 18 may be formed by one or more springs. In this case, for example, coil springs and / or disc springs can be used. FIGS. 1-4 schematically illustrate two coil springs which form the pretensioning device 18. The number of springs of the pretensioner 18 may vary. The coil springs allow a sufficient stroke of the second embossing tool 15 between the Prägepositi ^¬ on P and the ejection position E.

For forming the blank 14, the stamping press

10 also has a stamping ring 22. The ferrule 22 has an annular recess 23 coaxial with the working axis A at ^¬ ordered and aligned with the first stamping tool 13 and the second embossing tool 15th In the stamping position P, an embossing surface of the second stamping tool 15 is flush with an axial end of the annular recess 23 or is disposed within the annular recess 23. The first Embossing tool 13 can move by means of the plunger drive 12 by the movement of the plunger 11 a Ronde 14 from a feed side 24 of the stamping ring 22 ago in the ring recess 23. The ring recess 23 can be conically widened towards the feed side 24, ie viewed in the return stroke direction R. Adjoining the conical section adjacent to the feed side 24 is a cylindrical section of the annular recess 23 whose cross-sectional geometry corresponds to the geometry to be produced of the embossed blank 14 and may be circular or polygonal.

The still unembossed blanks 14 are conveyed adjacent to the feed side 24 by means of a conveyor 25 in the stamping press 10 and the embossed blanks 14 are transported out by means of the conveyor 25 from the stamping press 10. In Figures 1-4 is of the För ^¬ dereinrichtung 25 only schematically illustrated a turntable 26 with a plate recess 27. The turntable 26 is rotatable about an axis of rotation, which is preferably aligned parallel to the working axis A. It can in the circumferential direction about its axis of rotation distributed more Tellerausspa ^¬ stanchions 27 have in each case one circular blank fourteenth The turntable 26 is moved intermittently or clocked, so that a Ronde 14 to be embossed is substantially coaxial with the working axis A and thus aligned with the Prägewerkzeu ^¬ conditions 13, 15. After embossing the embossed Ron ^¬ de 14 is ejected back into the plate recess 27 and can be promoted by the turntable 26 in the next rotary stroke from the stamping press 10 out. In this Ab ^¬ transport an embossed Ronde 14, the next to be imprinted blank 14 is simultaneously supplied.

The stamping press 10 has an ejector device 30 with an ejector 31, which is supported, for example, indirectly to an actuator 32. The actuator 32 is connected via a connecting device 33 with the plunger 11 in motion. The movement connection between the plunger 11 and the actuator 32 is translationally free example. Alter ^¬ natively to a translation ratio between the movement of the plunger 11 and the movement of the ejector 31 may be present. In any case, causes the Hubbe ^¬ movement of the plunger 11 in the stroke direction H and in the return stroke ^¬ direction R movement of the actuator 32. The actuator 32 may be connected, for example by means of at least one tie rod or connecting rod 34 with the plunger 11.

In one embodiment of the stamping press 10 according to the figures 1-9, the connecting device 33 has only a single connecting rod 34 for transmitting the plunger movement to the actuator 32.

[0045] The at least or exactly one connecting rod 34 may have, at each one point a displacement device 35 for the connecting rod to be able to provide in the length of a ^¬ 34 (Figure 5). The adjusting device 35 may be designed, for example, by a threaded connection of a plurality of rod parts of each connecting rod 34.

In the case of the actuating device 32, in the exemplary embodiments according to FIGS. 1-9, a lever arrangement 80 is included. The lever arrangement 80 has a first lever 81 and a second lever 82, which are connected to each other at an articulation point 83 in an articulated manner. The first lever 81 is supported on a first support point 84. hinged on the press frame 16. The first lever 81 can pivot about the first support point 84 in a plane which is spanned by the stroke direction H or the return stroke direction R and a transverse direction Q. The transverse direction Q is oriented at right angles to the return stroke direction R or to the stroke direction H. In the transverse direction Q, the hinge point 83 has a first distance sl from the first support point 84 when the actuator 32 is in an initial position in which the second embossing tool 15 assumes the embossing position P, the first embossing tool 13 abuts the Ronde 14 and the Tappet 11 is located substantially at a reversal point of its stroke movement (Fig. 1).

The second lever 82 is supported on a second support point 85 by means of an overload safety device 48 on the press frame 16. In this embodiment of the overload protection device 48, a fluid space 41 is present within a housing 40. The housing 40 is in the embodiment according to the figures 1-9 deformable us example formed by a bellows. The Ge ^¬ housing 40 may be formed by any other suitable ^¬ A standardized at which can change the size and / or shape of the fluid chamber 41st For example, the fluid space 41 could also be limited by a movable piston 42, as is the case in the exemplary embodiment according to FIGS. 8-13.

Since the distance between the first support point 84 and the second support point 85 in the transverse direction Q must be able to change depending on the relative position of the two levers 81, 82, between the overload protection device 48 and the second lever 82, a roller bearing 89 is present to a sliding movement of the second lever 82 in Transverse direction Q relative to the overload protection device 48 to allow. The second lever 82 has a radially ge ^¬ curved bearing surface 90 which bears against a counter-bearing surface 91 and rolls upon pivotal movement of the second lever 82 on the anvil surface 91st The abutment surface 91 serves to support the second lever 82 when the overload protection 48 has not triggered. In undeployed overload protection urges (Figures 1, 2 and 4 to 6) and presses the overload protection device 48, the system ^¬ surface 90 against the anvil surface 91. The Wälzkreismit ^¬ telpunkt M is, for example according to below the abutment surface 90 (Figure 6). The second lever 82 may be fixedly connected to the bellows formed as a housing 40, for example ^{¬ be} screwed. The bellows is flexible and therefore does not block the pivotal and transverse movement of the second lever 82.

[0049] As is schematically illustrated by the arrow in Figures 1-4, the fluid space 41 may be connected to a ge ^¬ controlled or regulated pressure source, which controls the specifications of the gas pressure or air pressure in the fluid chamber 41 in accordance with or regulates.

[0050] In the fluid chamber 41 is closed in the first embodiment ^¬ compressible gas and particularly air. The housing 40 enclosing the fluid space 41 is arranged between the second support point 85 and the press frame 16. The second support point 85 has a second distance s2 from the hinge point 83 in the transverse direction Q. In the exemplary embodiment, the first distance s1 and the second distance s2 are the same size. Starting from the articulation point 83, the first support point 84 and the second support point 85 are thus in opposite directions Sides with respect to the hinge 83 opposite.

The first lever 81 has a first coupling point 86 and the second lever 82 has a second coupling point 87. At the first coupling point 86, the ejector 31 is supported directly or indirectly on the first lever 81 indirectly or alternatively to the illustrated embodiment. At the second coupling point 87 of the second lever 82, the connecting rod 34 engages. It should be noted at this point that the connecting rod 34 is illustrated in Figures 1-4 only schematically with one or more kinks. Preferably, the connecting rod 34 extends linearly parallel to the lifting direction H ^¬ or to the return stroke direction R.

[0052] The first coupling body 86 has a third distance S3 from the hinge point 83 and the second coupler ^¬ switching center 87 has a fourth distance S4 from the hinge point 83. Preferably, the third spacing S3 and the fourth distance s4 of equal size.

In the embodiment, a roller 88 is disposed on the first lever 81 at the first coupling point 86, which is supported indirectly or directly on the ejector 31. The roller 88 is preferably rotatably mounted on the first lever 81, so that during a pivotal movement of the first lever 81 about the first support point Abrollbe ^¬ movement of the roller 88 can take place on a component abutting thereto.

A first spring device 49 is supported on the one hand on the press frame 16 and on the other hand on the ejector ^¬ bolt 31 from, for example, on an annular shoulder. The first spring means 49 urges the ejector pin 31 away from the second stamping tool 15.

Between the ejector 31 and the lever assembly 80, a coupling device 55 is beispielsgemäß available. The coupling device 55 can be switched between a coupling position K (FIGS. 1-3) and a decoupling position D (FIG. 4). In the coupling position K, a movement of the actuator 32 in the return direction R is transferred to the ejector 31. The ejector pin 31 can thereby move the second embossing tool 15 from the embossing position P to the ejection position E, unless the overload safety device 48 has triggered due to an overload condition. In the Ent ^¬ coupling position D (Fig. 4), a movement of the actuator 32 and, for example, according to the lever arrangement 80 in the return stroke direction R is not (FIG. 4) leads to a displacement of the Auswerferbolzens 31, whereby the second stamping tool 15 remains in its embossing position P.

In the exemplary embodiment described here, the coupling device 55 has a first coupling part 56 and a second coupling part 57. At least one of the two coupling parts 56, 57 and, according to the example, the second coupling part 57 can be moved and, ^{according to the} example, be moved li ^¬ near. The second coupling part 57 can be moved at right angles or obliquely to the work axis A by means of a clutch ^¬ drive 58 of the coupling device 55th The clutch drive 58 may be formed by a linear motor. The second coupling part is arranged, for example, displaceably guided in a guide rail 72 (FIG. 6). [0057] The two coupling parts 56 have one and preferably a plurality of 59 parallel to the working axis A erstre ^¬ ADORABLE projections According to the example, each clutch ^¬ part 56, 57 at least two or three such projections 59. The projections 59 are in a direction in which the second coupling part be ^¬ 57 by the clutch actuator 58 wegbar, to form an intermediate space 60 with Ab ^¬ was disposed to each other. The gap 60 is dimensioned di ^¬ that a projection 59 of the other coupling part can be engaged with a reciprocating motion of the actuator 32 without that between the two coupling parts 56, a force is transmitted in the return stroke direction R 57th The projections 59 are transversely offset in the Endkopp ^¬ ment position D to the working axis A and do not come to rest (Figure 4). In the coupling position K, the projections 59 in the stroke direction H or in the return direction R are aligned with each other so that they abut each other with their end faces, so that a movement of the actuator 32 may cause a movement of the ejector 31.

In one embodiment, the second coupling part 57 is designed with the roller 88 as a structural unit

(Figures 7 to 9). The roller 88 therefore forms a Kammrol ^¬ le. The displacement of the first coupling part 56 takes place in this embodiment parallel to the axis of rotation of the roller 88th

Alternatively, the first coupling part 56 may also be carried out separately from the roller 88 and be indirectly or directly in contact with the roller 88. In Figures 1 to 4 are both (coupling portion 56 separately from the roll 88 or as a structural unit ausgebil ^¬ det) by the double arrow between the roller 88 and the first coupling part 56 illustrated. The separate first coupling part 56 may rest directly or indirectly on the roller 88. Example According to the first Kupp ^¬ averaging part 56 via a second spring means 62 can be supported on the press frame 16 (for clarity shown only in Figure 1 for). The second spring device 62 urges the first coupling part 56 away from the second coupling part 57 and, according to the example, in the direction of the lever arrangement 80.

The number of protrusions 59 and spaces 60 may vary, with preferably at least two or three protrusions 59 being provided on each coupling part 56, 57.

The embodiments of the embossing press 10 according to the figures 1-9 operate as follows:

At the beginning of the process is between the two

Embossing tools 13, 15 a new, to be stamped ^blank 14 leads ^¬ leads. Subsequently, the plunger drive 12 causes a movement of the plunger 11 with the first embossing tool 13 in the stroke direction H to the second embossing tool 15. In this case, the first embossing tool 13 takes in the plate recess 27 of the turntable 26 arranged Ronde 14 and moves the Ronde 14 into the ring recess 23 into it. Simultaneously with the plunger 11, the actuator 32 and in particular the lever assembly 80 moves in the stroke direction H, so that a pressing of the blank 11 against the second embossing tool 15 takes place only at a time at which the second embossing tool 15 has taken the embossed position P.

(Fig. 1). The force applied by the plunger drive 12 via the plunger 11 and the first stamping tool 13 forms the blank 14 between the two stamping tools 13, 15. half of the stamping ring 22 um.

After embossing, the plunger 11 moves back in the return direction R. In this case, the actuator 32 and, according to the example, the lever assembly 80 is actuated by means of the connecting device 33. When the coupling device 55 is in the coupling position K, the movement of the plunger 11 is transmitted via the Hebelan ^¬ Regulation 80 on the ejector 31. The ejector pin 31 then also moves in the return direction R and acts on the second embossing tool 15, which is thereby moved from the embossed position P to the ejection position E (FIG. 2). In this ejection position E, the second embossing tool 15 presses the embossed circular blank 14 out of the annular recess 23 back into the plate recess 27 of the turntable 26.

By a subsequent transport movement of the turntable 26, the embossed Ronde 14 is removed from the embossing ^¬ press 10 and fed to a new Ronde to be embossed or blank to be embossed. Subsequently, the embossing process starts again as described above.

In Figure 4, the coupling device 55 in the

Decoupling position D illustrated. Although the movement of the plunger 11 is still transmitted to the lever assembly 80, however, the lever assembly 80 and, for example, the first lever 81 can no longer transfer its movement to the ejector pin 31. The two coupling parts 56, 57 are mechanically decoupled and 56 übertra ^¬ generate movement in the return stroke direction R on the first coupling part is not transmitted to the second coupling part 57 of the first lever 81, so that the ejector 31, the second embossing tool 15 is not applied and the second embossing tool 15 remains in the embossed position P. In the first stroke of the plunger 11 partially embossed Ronde 14 remains in the stamping ring 22. During forming, the Ronde 14 expands in the radial direction and is frictionally or frictionally held in the annular recess 23. In the decoupling position D of the coupling device 55, the plunger with the first embossing tool 13 can exert several stamping strokes on the same blank 14. After the blank 14 has been finished, the coupling device 55 is switched over again into the coupling position K, so that the next return stroke of the plunger 11 in the return direction R can eject the embossed blank 14.

[0066] As illustrated in Figure 1, Zvi ^¬ rule can the two coupling parts 56, 57, a gap or clearance may be present when the second embossing tool 15 is in the embossing position and substantially no force between the ejector 31 and the second Embossing tool acts. This improves switching between the coupling position K and the decoupling position D (in both directions).

The procedure described above concerns embossing without an overload condition. In Figure 3, the occurrence of an overload condition is illustrated schematically illustrates ^¬ ^¬ light. When the force exerted on the ejector bolt 31 via the lever assembly 80 and the actuator 32, respectively, has reached a threshold, that force is limited by the overload safety device 48. In the embodiments according to FIGS. 1-9, the air in the fluid space 41 is compressed for this purpose. The first lever 81 forms at the first coupling place 86, so to speak, a fixed camp. Since the force on the ejector 31 is too large, the first lever 81 is supported at the first coupling point 86 and its pivotal ^¬ movement about the first support point 84 so to speak blocked. As the plunger 11 moves further in the return stroke direction R, the second lever 82 is moved at the second support point 85 and compresses the air in the fluid space 41. This limits the force exerted on the ejector pin 31 via the lever assembly 80.

[0068] In the figures 10-16 a further exporting ^¬ approximately example of embossing press 10 or the ejector 30 is illustrated. Only the differences from the previously explained embodiment will be described below.

In contrast to the previous Ausführungsbei ^¬ game the overload protection ^device 48 is formed in the second embodiment as a hydraulic Überlastsicherungsein ^¬ direction 48. The housing 40 with the fluid space 41 is bounded on one side by a movable piston 42, which closes the fluid space 41 in a fluid-tight manner. Via a securing line 43, in which a safety valve 44 is arranged, the fluid space 41 is fluidically connected to a reservoir 45.

Via a feed line 46, the reservoir 45 is fluidly connected to the fluid space 41. In the supply line 46, a pump 47 is arranged. The fluid used in ^¬ spielsgemäß a hydraulic fluid. As Hydraulikflüs ^¬ sigkeit the transmission oil of the stamping press can be used 10th The fluid space 41 is in error-free operation with the hydraulic fluid filled. When the fluid pressure in the fluid space 41 exceeds a threshold value, the safety valve 44 opens and the safety line 43 connects the fluid space 41 with the reservoir 45, so that the fluid flows out of the fluid space 41 into the reservoir 45. The reservoir 45 may be a substantially pressureless reservoir. At least the pressure in the reservoir 45 is lower than in the fluid space 41. The safety valve 44 connected fluidically to the fluid space 41 thus forms an overload safety device 48.

In this embodiment, the housing 40 is fixedly arranged on the connecting device 33 or is coupled in a coupled manner to the connecting rod 34. The first Fe ^¬ dereinrichtung 49 is supported in this Ausführungsbei ^¬ game on the one hand indirectly (or alternatively also directly) on Auswerferbolzen 31 and on the other hand on the piston 42 from. The first spring means 49 is preferably formed in this embodiment by a disc spring assembly with disc springs 50. Unlike the previous embodiment, the first coupling part 56 is supported on a support part 64 of the housing 40 via the second spring device 62, which has at least one spring 63. The second spring means 62 urges in the lifting direction H of the second coupling part 57 off the first Kupp ^¬ averaging part 56th

The second coupling part 57 opposite end of the Auswerferbolzens 31 is associated with the second embossing tool 15 and example according to the tool carrier 17 and abuts this when an embossed blank 14 is ejected from the embossing ring 22 (Figure 11). In principle, the stamping press 10 operates according to the

Figures 10-16 in normal operation as well as the embodiment ^¬ example according to the figures 1-9. When the embossing tool 15 is in the ejection position E, the first spring means 49 may (for example according to the disc springs 50) are pressed together elas ^¬ table. The ejector pin 31 can abut against a lower stop 65 (FIG. 11). If a slight lifting movement of the plunger 11 in the return direction R is performed in this position, this slight movement of the plunger 11 is compensated by compressing the first spring means 49. The ejector 31 continues to urge the embossing tool 15 and this ver ^¬ remains in its ejection position E.

In the position shown in FIG

Auswerferbolzen 31 abut an upper stop 66. Thus, the ejector pin 31 can move between a retracted position on the upper stop 66 and an extended position on the lower stop 65. In the extended position, the embossing tool 15 is in the ejection position E and in the retracted position, the embossing tool 15 is in the Prägepositi ^¬ on P. The lower stop 65 and the upper stop 66 are for clarity in the figures 10 and 11 only illustrated in a highly schematic and omitted in Figures 12 and 13.

In Figure 12, the stamping press 10 is shown when an overload condition occurs. If the force on the piston 42 becomes too large on the ejector 31, the clutch means 55 and the connecting pin 51, about ^¬ the fluid pressure in the fluid chamber 41 exceeds a defined through the safety valve 44 pressure threshold. This results in that the safety valve 44 is switched from its blocking ^¬ position (Figures 10, 11 and 13) in its open position (Figure 12) and the fluid space 41 fluidly connects to the reservoir 45. Since the pressure in the fluid space 41 is higher, the fluid flows out of the fluid space 41 impact ^¬ out of the reservoir 45. The fluid is also urged by the support of the first spring means 49 from the fluid space. This has the consequence that a Hubbewe ^¬ tion of the actuator 32 does not lead to the power transmission of the two coupling parts 56, 57 and thus to a movement of the ejector 31. The power flow is interrupted due to the substantially unpressurized fluid space 41. The pretensioning device 18 urges the second embossing tool 15 into the embossing position P, which remains there ver ^¬ . Such an overload case can occur when the round plate 14 has jammed in the ring recess 43 and can not be moved out of the ring recess 23 with the forces normally required. The overload protection device 48 protects the stamping press 10 against damage.

[0076] In Figure 14, the slide drive 12 and the off ^¬ bowler device 30 illustrated in perspective view. The ram drive 12 has a flywheel 70 which is drivable by a drive motor, not shown. The flywheel 70 is connected via a gear 71 with the plunger 11. The transmission 71 may be formed as an eccentric and / or toggle mechanism.

As can be seen in Figures 15 and 16, the plate springs 50 of the first spring means 49 are arranged in the embodiment coaxial with the working axis A to ei ^¬ nen connecting pin 61 around. The connection bolt couples according to the first coupling part 56 with the piston 42nd

The second coupling part 57 is in the direction in which it can be moved by the clutch drive 48, ^¬ preferably linearly guided. Is analogous to the previously be registered ^¬ embodiment (Figures 1 to 9), the second coupling part 57 in the guide rail 72 slidably disposed ver ^¬ (Figures 6 and 15). The second Kupp ^¬ averaging part 57 may also be referred to as a comb and the first slide Kupp ^¬ averaging part as a counter-comb.

In both embodiments, the coupling drive 58 may comprise a linear motor, which is able to move the second coupling part 57 very quickly transversely to the working axis A and thus transversely to the stroke direction H and the return stroke direction R. As shown in Figures 7 and 16, designed as a linear electric motor clutch drive 58 is stationary and does not move together with the housing 40 in the stroke direction H or in Rückhubrichtung R. This relative movement in the stroke direction H or Rückhubrichtung R can through a corresponding connection unit of a drive part (eg piston rod ^¬ ) of the linear motor 58 with the second coupling part 57 done. This connection unit can have two parallel to the working axis A displaceable ^{fasteners ¬} , which are radially movable to the working axis only together. For example, a connecting member can be a nut, which is guided only in one degree of freedom in a groove of the other connecting element parallel to the working axis A ^¬ displaceable. The one Verbindungsele ^¬ ment is firmly connected to the linear drive 58 and the other connec ^¬ tion element with the second coupling part 57. the .

[0080] The invention relates to an embossing press for pre ^¬ gene of a blank 14. A in a lifting direction H and opposite to the lifting direction H in a return stroke direction R movable plunger 11 carries a first stamping tool 13 to a press frame 16 is a second embossing tool 15 mounted. In addition, a stamping ^¬ ring 22 is arranged on the press frame 16. The embossing tools 13, 15 and an embossing recess 23 formed by the embossing ring 22 are arranged in alignment along a working axis A. An ejector device 30 serves to eject an embossed blank 14 from the annular recess 23 of the stamping ring 22. It has an ejector pin 31 which is supported on an actuating device 32. The actuator 32 is movably connected to the plunger 11. In a return stroke of the plunger 11 in the return direction R, the ejector 31 can be supported on the actuator 32 and exert a force on the second embossing tool 15 in return stroke ^¬ direction R to press the blank 14 from the embossing ring 22. During a movement of the plunger 11 in the stroke direction H, the actuating device 32 away from the second embossing tool 15 such that the ejector 31 no force in Rückhubrichtung R on the second embossing tool 15 exerts and the second embossing tool 15 can take the embossed position P. Reference sign list:

10 stamping press

11 pestles

12 ram drive

13 first stamping tool

14 plate

15 second embossing tool

16 press frame

17 tool carrier

18 pretensioner

19 stop

22 stamping ring

23 ring recess

24 feed side

25 conveyor

26 turntable

27 plate recess

30 ejector device

31 ejector bolts

32 actuator

33 connection device

34 connecting rod

35 adjusting device

40 housing

41 fluid space

42 pistons

43 fuse line

44 safety valve reservoir

supply line

pump

Overload safety device first spring device

Disc spring coupling device

first coupling part

second coupling part

clutch drive

head Start

gap

Connecting bolt second spring device spring

supporting part

bottom stop flywheel

transmission

Guide rail Lever arrangement

first lever

second lever

articulation point

first support point

second support point

first coupling site second coupling site 88 role

89 rolling bearings

90 contact surface

91 counter-investment surface

A working axis

D decoupling position

E ejection position

H stroke direction

K coupling position

M rolling circle center

P embossing position

R return stroke direction sl first distance s2 second distance s3 third distance s4 fourth distance

Claims

Claims:

1. embossing press (10) for embossing a blank (14), with a plunger (11) by means of a plunger drive (12) in a stroke direction (H) and against the stroke direction (H) in a return stroke (R) is movable, with a first embossing tool (13), which is arranged on the plunger (11), with a second embossing tool (15), which is arranged on a press frame (16), and with a stamping ring (22), with an ejection device (30) comprising an ejector pin (31) adapted to move the second embossing tool (15) in the return stroke direction (R) from an embossing position (P) to an ejection position (E) to form an embossed blank (14) of FIG Ejection ring (22) with a connecting device (33) which has an ejector bolt (31) supporting the actuating device (32) and at least one connecting rod (34) on ^¬ which the plunger (11) and the ^{Betätigungseinrich ¬} device (32) coupled with each other in such a way that the A uswerferbolzen (31), the second stamping tool (15) not acted upon with a force in the return stroke direction (R) before the second embossing tool (15) has reached the embossing ^¬ position (P) when plunger (11) for by means of the tappet drive (12) Embossing the Ronde (14) in Hub ^¬ direction (H) is moved.

2. embossing press according to claim 1,

characterized in that a coupling device (55) is arranged between the actuating ^¬ means (32) and the ejector (31) having a ^¬ is to directed, the actuating device (32) and the ejector (31) in a coupling position (K) to be coupled together in the return stroke direction (R) or to be decoupled from one another in a decoupling position (D) in the return stroke direction (R).

3. embossing press according to claim 2,

characterized in that the coupling device (55) having a said actuating means (32) coupled to the first coupling part (56) a coupled with the ejector ^¬ bolt (31) second coupling part (57) and a clutch actuator (58) to be ^¬ is directed, at least one of the coupling parts (56, 57) between a coupling position (K) and a decoupling position (D) to move.

4. embossing press according to claim 2 or 3,

characterized in that in the decoupling ^{Stel ¬} ment (D) causes a movement of the actuating device (32) in the return stroke (R) no movement of the ejector pin (31) in the return direction (R).

5. Embossing press according to one of the preceding claims, characterized in that the actuating device (32) has a lever arrangement (80) comprising a first lever (81) and a second lever (82) which are hinged together at a hinge point (83) ,

6. embossing press according to claim 5,

characterized in that the ejector pin (31) is coupled to the first lever (81) at a first coupling ^{¬ point} (86) in a transverse direction (Q) perpendicular to the stroke direction (H) and the return stroke ^¬ direction (R) a Distance (s3) to the hinge point (83).

7. embossing press according to claim 5 or 6,

characterized in that the connecting rod (34) with the second lever (82) at a second coupling point (87) is coupled in a transverse direction (Q) at right angles to the stroke direction (H) and the return stroke ^¬ direction (R) a distance ( s4) to the hinge point (83).

8. embossing press according to claim 6 and 7,

characterized in that the distance (s3) between the first coupling point (86) and the hinge point (83) is equal to the distance (s4) between the second coupling point (87) and the hinge point (83).

9. embossing press according to one of the preceding claims, characterized in that the second embossing tool (15) in the stroke direction (H) against a stop (19) of the press frame (16), when it is in the pre ^¬ geposition (P).

10. embossing press according to one of the preceding claims, characterized in that the second embossing tool (15) by means of a biasing means (18) in the embossing position (P) is urged.

11. embossing press according to one of the preceding claims, characterized in that on the actuating device (32) an overload protection device (48) is arranged, which limits a between the actuating device (32) and the ejector pin (31) transferable force.

12. embossing press according to claim 11,

characterized in that the overload safety device (48) has a fluid space (41).

13. embossing press according to claim 12,

characterized in that the fluid space (41) is compressible.

14. Embossing press according to one of claims 11 to 13 and according to one of claims 5 to 8,

characterized in that the overload safety device (48) is coupled to the second lever (82).

15. A method for embossing a blank (14) using a stamping press (10) according to any one of the preceding claims, comprising the following steps:

Feeding a blank (14) between the first embossing tool (13) and the second embossing tool (15),

- Moving the plunger in the stroke direction (H), which due to the movement coupling of the plunger (11) with the Auswerferbolzen (31) and the Auswerferbolzen (31) in the stroke direction (H) moves and a movement of the second embossing tool (15) in the embossing position (P) and moving the blank (14) by means of the first embossing Tool (13) in the stamping ring (22),

Pressing the blank (14) against the second stamping tool (15), only when the second stamping tool (15) is in the stamping position (P),

Moving the plunger (11) in the return stroke direction (R) away from the second embossing tool (15),

- Moving the ejector pin (31) in the return stroke (R), if an ejection of the embossed Ronde (14) from the stamping ring (22) should take place, by the movement coupling of the ejector pin (31) with the plunger (11).

16. The method according to claim 15,

characterized in that after the ejection of a stamped blank (14), a further be embossed Ronde (14) fed between the first embossing tool (13) and the second stamping tool (15) and at the same time ge ^¬ shaped blank (14) from the region between the first stamping tool (13) and the second stamping tool (15) is conveyed.

17. The method according to claim 15 or 16,

characterized in that the stroke paths of the plunger (11) and the Auswerferbolzens (31) in a return stroke of the plunger (11) in the return direction (R) are the same size when an embossed Ronde (14) from the stamping ring (22) is ejected.