DE102014002888A1 - Forging hammer and method for operating a forging hammer - Google Patents

Abstract

The invention relates to a forging hammer, wherein a hydraulic cylinder (4a) between an upper hydraulic port (19) and a lower hydraulic port (20) comprises a central hydraulic port (21), wherein the central hydraulic port (21) with the interposition of the control valve (9b) with the Return tank (18) is connected such that this control valve (9b) operates on a return stroke of the piston (4b) for influencing a Rückhubgeschwindigkeit as a throttle valve. Furthermore, the invention relates to a method for operating a forging hammer (1).

Description

The invention relates to a forging hammer and a method for operating a forging hammer according to the preamble of claim 1 or 7.

From the JP 2000-317 566 A a control method for controlling a strike of a forging machine, in which a braking time is automatically set depending on the forging progress. Furthermore, from this document, a forging machine is known in which inlet and return of a hydraulic cylinder are controlled via two servo valves.

It is the object of the invention to propose a forging hammer and a method for operating a forging hammer, in which a downward stroke or impact and / or a return stroke take place or take place in a manner that is gentle on the hammer and with optimized speed.

This object is achieved by the device described in the characterizing part of claim 1 and by the method steps indicated in the characterizing part of claim 7. In the dependent claims advantageous and expedient developments are given.

The hydraulic cylinder of the forging hammer according to the invention comprises a central hydraulic connection between the upper hydraulic connection and the lower hydraulic connection, the middle hydraulic connection being connected to the return tank with the interposition of the control valve such that the control valve works as a throttle valve during a return stroke of the piston to influence a return stroke speed. This makes it possible to regulate a return movement of a mass unit formed from piston, bear and upper die without additional components by means of the control valve according to the requirements and in particular to optimize the shortest possible travel time. By regulating the return stroke via the central hydraulic connection, the danger is further prevented that the mass unit drives directly against the hydraulic cylinder if the braking process is designed too weakly, since the hydraulic oil located above the piston can not flow off completely via the central hydraulic connection.

It is further provided to provide the forging hammer with an electronic control device and at least one sensor device, wherein at least one of the sensor devices is designed in particular as Wegmess- and / or speed measuring device which detects a movement of the piston and this outputs data to the control device and / or several of the sensor devices are in particular designed as flow sensors which detect volume flows in hydraulic lines connected to the hydraulic lines and output data to the control device and / or wherein at least one of the sensor devices is designed in particular as image-processing detection device which detects a progress of the deformation of the workpiece and this Output data to the control device. Such a detection and processing of machine data allows the control valve or the control valves to be optimally regulated with regard to their switching position and with regard to their flow cross sections, so that different large workpieces can be processed with the forging hammer in accordance with their specific requirements.

In order to protect a drive unit comprising the hydraulic cylinder and the piston, it is provided to connect the lower hydraulic connection directly to the pressure accumulator while avoiding interposition of the control valve or valves. As a result, in the reversal point in the transition from the stroke in the return stroke always under pressure hydraulic fluid for braking phase available.

It is also provided to connect the upper hydraulic port with the interposition of the control valve with the pressure accumulator and the return tank such that the control valve is closed in a return stroke and that the control valve is open at a stroke. By closing the upper hydraulic connection by means of the control valve, it is ensured during the return stroke that the piston moves into a kind of brake bushing after passing through the middle hydraulic connection, since the hydraulic fluid located above the middle hydraulic connection can no longer flow away via the upper hydraulic connection. For the lifting movement, it is advantageous if the control valve activating the upper hydraulic connection is opened, since the piston can then already be accelerated out of its upper reversing point. About this control valve and its variable during the stroke or down stroke opening cross section, the downward stroke can be optimized and adapted to the particular requirements.

Furthermore, it is provided that in a forging operation at the time of forming a forming energy, which is provided by a kinetic energy of the upper tool, is many times greater than a forming energy, which could be provided by the hydraulic pressure. As a result, the hydraulic components do not have to be adapted to the requirements imposed on the forging and can be sized accordingly smaller.

It is also envisaged to accelerate the upper tool during stroke to a speed of more than 2 m / s and in particular more than 5 m / s in the direction of the lower die and / or a contact time between upper die and workpiece between stroke and return stroke to less than 200 to restrict ms. As a result, short work cycles are possible or a pressure contact time is thereby reduced to a minimum and thus in particular unwanted adhesion of the upper tool on the workpiece safely avoided.

• – dass beim Auslösen eines Schlags und während eines darauf folgenden Hubs bzw. Abwärtshubs für eine Hydraulikflüssigkeit ein mittlerer Hydraulikanschluss geschlossen und ein oberer Hydraulikanschluss geöffnet ist, wobei die Hydraulikflüssigkeit zur Beeinflussung einer Hubgeschwindigkeit durch ein erstes Steuerventil geführt wird, und
• – dass bei einem auf den Hub folgenden Rückhub die Hydraulikflüssigkeit durch den mittleren Hydraulikanschluss in einen Rücklauftank geführt wird, wobei die Hydraulikflüssigkeit zur Beeinflussung einer Rückhubgeschwindigkeit durch das erste Steuerventil oder durch ein zweites Steuerventil geführt wird und
• – dass das bzw. die Steuerventil(e) als Proportional- bzw. Servoventil(e) ausgebildet ist bzw. sind und während des Rückhubs als geregelter Ablauf bzw. geregelte Drossel und während des Hubs als geregelter Zulauf arbeitet bzw. arbeiten.

The method according to the invention for operating a forging hammer, which is designed in particular according to at least one of claims 1 to 6, comprises the steps of

• - That when a shock and during a subsequent stroke or down stroke for a hydraulic fluid, a central hydraulic port is closed and an upper hydraulic port is opened, the hydraulic fluid is guided to influence a lifting speed by a first control valve, and
• - That at a following stroke to the return stroke, the hydraulic fluid is passed through the central hydraulic port in a return tank, wherein the hydraulic fluid is guided to influence a Rückhubgeschwindigkeit by the first control valve or by a second control valve and
• - That the or the control valve (s) is designed as a proportional or servo valve (s) and are working or working during the return stroke as a controlled sequence or controlled throttle and during the stroke as a regulated inlet.

This makes it possible to control a stroke and a return stroke movement of a mass unit formed from piston, bear and upper die without additional components by means of the control valve according to the requirements and, in particular, to optimize the shortest possible movement time. By regulating the return stroke via the central hydraulic connection, the danger is further prevented that the mass unit will drive directly against the hydraulic cylinder if the braking process is rated too low, since the hydraulic oil located above the piston can not flow off completely through the central hydraulic connection.

Furthermore, it is provided that during the return stroke of the upper hydraulic port is closed, so that the piston is braked when passing over the central hydraulic port by the hydraulic fluid remaining in the hydraulic cylinder. As a result, in the reversal point in the transition from the stroke in the return stroke always under pressure hydraulic fluid for damping available.

It is also provided to pressurize a lower hydraulic port at a stroke and a return stroke and in particular continuously from the pressure accumulator with the hydraulic fluid. As a result, in the reversal point in the transition from the stroke in the return stroke always under pressure hydraulic fluid for damping available.

• – dass das oder die Steuerventile von einer elektronischen Kontrolleinrichtung kontrolliert werden, wobei die Kontrolleinrichtung hierzu mit wenigstens einer Sensoreinrichtung verbunden ist,
• – wobei wenigstens eine der Sensoreinrichtungen insbesondere als Wegmess- und/oder Geschwindigkeitsmesseinrichtung ausgebildet ist, welche eine Bewegung des Kolbens erfasst und hierzu Daten an die Kontrolleinrichtung ausgibt, und/oder
• – wobei mehrere der Sensoreinrichtungen insbesondere als Durchflusssensoren ausgebildet sind, welche Volumenströme in mit den Anschlussstellen verbundenen Hydraulikleitungen erfassen und hierzu Daten an die Kontrolleinrichtung ausgeben, und/oder
• – wobei wenigstens eine der Sensoreinrichtungen insbesondere als bildverarbeitende Erfassungseinrichtung ausgebildet ist, welche einen Fortschritt der Verformung Werkstücks erfasst und hierzu Daten an die Kontrolleinrichtung ausgibt,
• – wobei von der Kontrolleinrichtung aus Daten der Sensoreinrichtungen) geeignete Signale für das oder die Steuerventile errechnet und an dieses bzw. diese ausgegeben werden.

Finally, it is intended

• - That the control valve or valves are controlled by an electronic control device, wherein the control device is for this purpose connected to at least one sensor device,
• - Wherein at least one of the sensor devices is designed in particular as Wegmess- and / or speed measuring device which detects a movement of the piston and this outputs data to the control device, and / or
• Wherein a plurality of the sensor devices are in particular designed as flow sensors which detect volume flows in hydraulic lines connected to the connection points and for this purpose output data to the control device, and / or
• Wherein at least one of the sensor devices is designed in particular as an image-processing detection device which detects a progress of the deformation of the workpiece and for this outputs data to the control device,
• - From the control device of data from the sensor devices) suitable signals for the control valves or the calculated and output to this or these.

By such a method with a collection and processing of machine data, the control valve or the control valves can be optimally regulated with respect to their switching position and with respect to their flow cross sections, so that different large workpieces can be processed in accordance with the requirements with the forging hammer.

For the purposes of the invention, a stroke is understood to mean that movement in which an upper tool is moved by a piston of a hydraulic cylinder in the direction of a lower die. In the context of the invention, a return stroke is understood to mean that movement in which an upper tool is moved away from a lower die by a piston of a hydraulic cylinder.

Further details of the invention are described in the drawing with reference to schematically illustrated embodiments.

Hereby shows:

1 a schematic view of a forging hammer, the hydraulic components are designed and arranged according to a first hydraulic plan;

2 : a schematic view of the from the 1 known forging hammer, wherein the hydraulic components are designed and arranged according to a second hydraulic plan;

3 : a schematic view of the from the 1 known Schmiedehammers, wherein the hydraulic components are designed and arranged according to a third hydraulic plan and

4 : a schematic view of the from the 1 known forging hammers, wherein the hydraulic components are designed and arranged according to a fourth hydraulic plan.

In the 1 is a smithing hammer 1 shown in schematic view, the hydraulic components are designed and arranged according to a first hydraulic plan HP1. The blacksmith hammer 1 is for forging a workpiece 2 provided and is as a short-stroke drop hammer 3 educated. The blacksmith hammer 1 includes a hydraulic cylinder 4a , one in the hydraulic cylinder 4a guided piston 4b , a bear 5 , a superstar 6 , a lower part 7 and a machine frame 8th , As other components, which are also part of the hydraulic plan HP1, includes the forging hammer 1 a first control valve 9a , a second control valve 9b , an electronic control device 10 and a sensor device 11 . 12a - 12c . 13 and 14 , The bear 5 and the upper part 6 form one of the hydraulic cylinder 4 moving upper tool 15 , The blacksmith hammer 1 further includes a hydraulic circuit 16 in which the hydraulic cylinder 4a and the control valves 9a . 9b are involved. The control valve 9a is via a line L1 to a pressure accumulator 17 connected. The control valve 9a is via a line L2 with an upper hydraulic connection 19 with the double-acting hydraulic cylinder 4a connected. The accumulator 17 is directly connected to a lower hydraulic connection via a L3 line 20 with the hydraulic cylinder 4a connected. The control valve 9b is via a line L4 to a return tank 18 connected. The control valve 9b is via a L5 line with a medium hydraulic connection 21 with the hydraulic cylinder 4a connected. In the 1 is the blacksmith's hammer 1 shown in a position in which the piston 4b together with the upper tool 15 just finished a return stroke in an arrow x direction. The control valves 9a and 9b are still in intended for the return stroke positions. This is the control valve 9a closed, leaving the upper hydraulic connection 19 no hydraulic fluid HF can escape and the piston 4b after passing the middle hydraulic connection 19 in through the above the piston 4b located hydraulic fluid HF formed hydraulic cushion HK moves and if necessary still braked by this. The second control valve 9b stands for the return stroke in an open position, so that the hydraulic fluid HF in the return tank 18 can drain as long as the piston 4b not yet in the 1 has reached shown position. To the piston 4b to move in the direction of the arrow x 'is via the lower hydraulic connection 20 Hydraulic fluid HF from the accumulator 17 in the hydraulic cylinder 4a promoted.

Basically for the in the 1 shown embodiment variant and for in the other 2 to 4 shown embodiments that the piston 4b in its uppermost position the middle hydraulic connection 21 closes, so that prevents hydraulic fluid HF, which via the lower hydraulic connection 20 flows in, via the middle hydraulic connection 21 flows out again.

For a stroke movement of the piston 4b in the direction of the arrow x then both control valves 9a and 9b reversed, so over the control valve 9a Hydraulic fluid HF via the upper hydraulic connection 19 in the hydraulic cylinder 4a flows and the piston 4b against the at the lower hydraulic connection 20 pending hydraulic fluid HF pushes in the direction of the arrow x, which via the lower hydraulic port 20 Applicable counterforce due to different pressure surface sizes is smaller than that via the upper hydraulic connection 19 applied force and in addition the weight of the bear 5 acts in the direction of arrow x. During the lifting movement is the control valve 9b closed, so no hydraulic fluid HF over the middle hydraulic connection 21 can flow out.

An inflow of hydraulic fluid HF via the upper hydraulic connection 19 in the hydraulic cylinder 4a and an outflow of hydraulic fluid HF via the middle hydraulic connection 21 from the hydraulic cylinder 4a can be achieved by training the control valves 9a . 9b as proportional valves of the control device 10 steplessly regulate. To calculate suitable control values are to the control device 10 the sensor 11 as distance measuring and / or speed measuring device, the sensors 12a to 12c as flow measuring devices, the sensor 13 as image processing sensor device and the sensor 14 connected as a vibration sensor. Together with all or a part of the data provided by the sensors, the control device then calculates on the basis of further specifications, which in particular also the workpiece to be forged 2 concern, control values for the control valves, so that the upper tool 15 with the desired speed or impact energy to the workpiece 2 meets and so that the return stroke takes place in accordance with the intended movement profile and in particular fast and time-saving.

In the 2 is another view of the from the 1 known blacksmith's hammer 1 shown, with its hydraulic components, namely control valves, lines, pressure accumulator and return tank, formed and arranged according to a second hydraulic plan HP2, wherein with respect to the other components of the forge hammer 1 expressly to the description of 1 is referenced.

In contrast to 1 are in the 2 control valves 109a and 109b not designed as two-way valves with two switch positions, but as three-way valves with three switch positions. To simplify the wiring diagram pressure accumulator 117 and return tank 118 shown twice. The lower hydraulic connection 19 is again directly via a line L101 with the accumulator 117 connected. The second control valve 109b is via lines L102 and L103 with the accumulator 117 and the return tank 118 connected. The middle hydraulic connection 21 is via a line L104 with the interposition of the second control valve 109b and in dependence on its switching position with the pressure accumulator 117 or a return tank 118 connectable. The first control valve 109a is via lines L105 and L106 with the accumulator 117 and the return tank 118 connected. The upper hydraulic connection 19 is via a line L107 with the interposition of the first control valve 109a and in dependence on its switching position with the pressure accumulator 117 or a return tank 118 connectable. This results in principle the same functionality as in the embodiment of 1 , In addition, however, it is possible during the return stroke via the upper hydraulic connection 19 Hydraulic fluid HF in the return tank 118 to escape. In addition, it is also possible to further accelerate a stroke in the direction of arrow x and the middle hydraulic connection 21 to the accumulator 117 to join.

In the 3 is another view of the from the 1 known blacksmith's hammer 1 shown, with its hydraulic components, namely control valves, lines, pressure accumulator and return tank, formed and arranged according to a third hydraulic plan HP3, wherein with respect to the other components of the forge hammer 1 expressly to the description of 1 is referenced.

In contrast to 1 is in the 3 according to the hydraulic diagram HP3 only one control valve 209a installed, which is designed as a two-way valves. The lower hydraulic connection 19 is not directly with an accumulator here 217 connected. Rather, the control valve 209a via lines L201 and L202 with a pressure accumulator 217 and a return tank 218 connected. The lower hydraulic connection 20 is via a line L203 with the interposition of the control valve 209a and in dependence on its switching position with the pressure accumulator 217 or the return tank 118 connectable. The middle hydraulic connection 21 is via a line L204 with the interposition of the control valve 209a and in dependence on its switching position with the pressure accumulator 217 or the return tank 218 connectable. The upper hydraulic connection 19 is through a line L205, in which a check valve 209c is arranged, via the line L204 with the interposition of the control valve 209a and in dependence on its switching position with the pressure accumulator 217 or the return tank 118 connectable, being through the check valve 209c only the switching position of the control valve 209a an effect unfolds in which the upper hydraulic connection 19 with the accumulator 217 is connected because a leakage of the hydraulic fluid HF from the upper hydraulic port 19 in the return tank 218 through the check valve 209c is prevented, so that the piston 4b is always decelerated by the hydraulic cushion HK during its return stroke in the direction of arrow x '.

In the 4 is another view of the from the 1 known blacksmith's hammer 1 shown, with its hydraulic components, namely control valves, lines, pressure accumulator and return tank, are formed and arranged according to a fourth hydraulic plan HP4, wherein with respect to the other components of the forge hammer 1 expressly to the description of 1 is referenced.

In contrast to 1 is in the 4 according to the hydraulic diagram HP4 only one control valve 309a installed, which is designed as a two-way valves with two switching positions. The lower hydraulic connection 19 is here via a line L301 directly with a pressure accumulator 317 connected. The control valve 309a is via lines L302 and L303 with the accumulator 317 and a return tank 318 connected. The middle hydraulic connection 21 is via a line L304 with the interposition of the control valve 309a and depending on its switching position with the return tank 318 connectable. The upper hydraulic connection 19 is via a line L305 with the interposition of control valve 309 and in dependence on its switching position with the pressure accumulator 217 connectable. Thus, either the upper hydraulic connection 19 with the accumulator 317 connected and the middle hydraulic connection 21 blocked or it is the upper hydraulic connection 19 blocked and the middle hydraulic connection 21 with the return tank 318 connected. Here is the lower hydraulic connection 20 constantly with the accumulator 317 connected. Thus, the hydraulic plan HP4 with respect to the functionalities provided by this with the hydraulic plan HP1 (see 1 ) comparable.

LIST OF REFERENCE NUMBERS

1

sledgehammer

2

workpiece

3

Short-maul

4a

hydraulic cylinders

4b

piston

5

bear

6

upper die

7

lower die

8th

machine frame

9a, 9b

control valve

10

control device

11

sensor device

12a, 12b, 12c

sensor device

13, 14

sensor device

15

upper tool

16

Hydraulic circuit

17

accumulator

18

Return tank

109a, 109b

control valve

117

accumulator

118

Return tank

209a

control valve

209c

check valve

217

accumulator

218

Return tank

309a

control valve

317

accumulator

318

Return tank

HF

hydraulic fluid

HK

hydraulic cushion

HP1-HP4

hydraulic plan

L1-L5

management

L101-L107

management

L201-L204

management

L301-L305

management

x, x '

arrow

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2000-317566 A [0002]

Claims (10)

Forging hammer ( 1 ) comprising - a hydraulic cylinder ( 4a ), - one in the hydraulic cylinder ( 4a ) movable piston ( 4b ), - a bear ( 5 ), - an upper die ( 6 ), - a lower die ( 7 ), - a machine frame ( 8th ), - at least one control valve designed as a proportional valve or servovalve ( 9a . 9b ; 109a . 109b ; 209a ; 309a ), - an accumulator ( 17 ; 117 ; 217 ; 317 ) for hydraulic fluid (HF), - a return tank ( 18 ; 118 ; 218 ; 318 ) for the hydraulic fluid (HF), - the bear ( 5 ) and the upper die ( 6 ) one of the piston ( 4b ) moved upper tool ( 15 ) and wherein the piston ( 4b ) leading hydraulic cylinders ( 4a ) an upper hydraulic connection ( 19 ) and a lower hydraulic connection ( 20 ), characterized in that - the hydraulic cylinder ( 4a ) between the upper hydraulic connection ( 19 ) and the lower hydraulic connection ( 20 ) a middle hydraulic connection ( 21 ), the middle hydraulic connection ( 21 ) with the interposition of the control valve ( 9b ; 109b ; 209a ; 309a ) with the return tank ( 18 ; 118 ; 218 ; 318 ) is connected in such a way, that this control valve ( 9b ; 109b ; 209a ; 309a ) during a return stroke of the piston ( 4b ) operates to influence a Rückhubgeschwindigkeit as a throttle valve. Mauling hammer according to claim 1, characterized in that the forging hammer ( 1 ) an electronic control device ( 10 ) and at least one sensor device ( 11 - 14 ), wherein at least one of the sensor devices ( 11 - 14 ) is formed in particular as a displacement measuring and / or speed measuring device, which movement of the piston ( 4b ) and, for this purpose, data to the control 10 ) and / or - wherein several of the sensor devices ( 11 - 14 ) are in particular designed as flow sensors, which volume flows in with the hydraulic connections ( 19 . 20 . 21 L51, L104, L107, L203, L204, L301, L304, L305) and, for this purpose, data to the control device (2). 10 ) and / or - at least one of the sensor devices ( 11 - 14 ) is formed, in particular, as an image-processing detection device which monitors an advance of the deformation of the workpiece ( 2 ) and, for this purpose, data to the control 10 ). Molding hammer according to one of the preceding claims, characterized in that the lower hydraulic connection ( 20 ) while avoiding interposition of the control valve or valves ( 9a . 9b ; 109a . 109b ; 209a ; 309a ) directly to the accumulator ( 17 ; 117 ; 2017 ; 317 ) connected is. Molding hammer according to one of the preceding claims, characterized in that the upper hydraulic connection ( 19 ) with the interposition of the control valve ( 9a ; 109a ; 209a ; 309a ) with the accumulator ( 17 ; 117 ; 217 ; 317 ) and the return tank ( 18 ; 118 ; 218 ; 318 ) is connected in such a way that the control valve ( 9a ; 109a ; 209a ; 309a ) is closed during a return stroke and that the control valve ( 9a ; 109a ; 209a ; 309a ) is open at a hub. Molding hammer according to one of the preceding claims, characterized in that in a forging operation at the time of forming a forming energy, which by a kinetic energy of the upper tool ( 15 ) is many times larger than a forming energy that could be provided by the hydraulic pressure. Molding hammer according to one of the preceding claims, characterized in that the upper tool ( 15 ) at the hub to a speed of more than 2 m / s and in particular more than 5 m / s in the direction of the lower die ( 7 ) and / or that the upper die ( 6 ) with a workpiece ( 2 ) is in contact for less than 200 ms. Method of operating a forging hammer ( 1 ), in particular for the operation of a forge hammer ( 1 ) according to at least one of claims 1 to 6, characterized in that - when a strike is triggered and during a following stroke for a hydraulic fluid (HF), a middle hydraulic connection ( 21 ) and an upper hydraulic connection ( 19 ) is opened, wherein the hydraulic fluid (HF) for influencing a stroke speed by a first control valve ( 9a ; 109a ; 209a ; 309a ), and - in the case of a return stroke following the stroke, the hydraulic fluid (HF) is passed through the central hydraulic port ( 21 ) in a return tank ( 18 ; 118 ; 218 ; 318 ), wherein the hydraulic fluid (HF) for influencing a Rückhubgeschwindigkeit by the first control valve ( 209a ; 309a ) or by a second control valve ( 9b ; 109b ) and wherein the control valve or valves (e) ( 9a . 9b ; 109a ; 209a ; 309a ) is designed as a proportional or servo valve (s) and are and during the return stroke as a controlled sequence or controlled throttle and works as a regulated feed during the stroke. A method according to claim 7, characterized in that during the return stroke of the upper hydraulic connection ( 19 ) is closed, so that the piston ( 4b ) when driving over the middle hydraulic connection ( 21 ) by in the hydraulic cylinder ( 4a ) remaining hydraulic fluid (HF) is braked. Method according to claim 7 or 8, characterized in that a lower hydraulic connection ( 20 ) at a stroke and a return stroke and in particular permanently from the accumulator ( 17 ; 117 ; 217 ; 317 ) is charged with the hydraulic fluid (HF). Method according to claim 7, 8 or 9, characterized in that - the control valve or valves ( 9a . 9b ; 109a . 109b ; 209a ; 309a ) from an electronic control device ( 10 ), the control equipment ( 10 ) for this purpose with at least one sensor device ( 11 - 14 ), wherein at least one of the sensor devices ( 11 - 14 ) is formed in particular as a displacement measuring and / or speed measuring device, which movement of the piston ( 4b ) and, for this purpose, data to the control 10 ), and / or - wherein a plurality of the sensor devices ( 11 - 14 ) are in particular designed as flow sensors, which volume flows in with the hydraulic connections ( 19 . 20 . 21 L51, L104, L107, L203, L204, L301, L304, L305) and, for this purpose, data to the control device (2). 10 ), and / or - wherein at least one of the sensor devices ( 11 - 14 ) is formed, in particular, as an image-processing detection device which monitors an advance of the deformation of the workpiece ( 2 ) and, for this purpose, data to the control 10 ), - by the control body ( 10 ) from data of the sensor devices) ( 11 - 14 ) suitable signals for the control valve (s) ( 9a . 9b ; 109a . 109b ; 209a ; 309a ) are calculated and output to this or these.

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