DE102015116039A1 - Pressure pin for a press for forming a workpiece, press for forming a workpiece, method for incorporating and setting a press during forming, method for manufacturing a component and component - Google Patents

Abstract

The invention relates to a pressure pin for a press for forming a workpiece, wherein the pressure pin, a die cushion and at least one tool can be assigned and by means of the pressure pin sheet holding force of the die cushion to the tool is transferable, and the pressure pin a sensor for detecting at least one state variable having. Furthermore, the invention relates to a press for forming a workpiece, a method for incorporating and adjusting a press during forming, a method for manufacturing a component and a component.

Description

The invention relates to a pressure pin for a press for forming a workpiece, wherein the pressure pin, a die cushion and at least one tool can be assigned and by means of the pressure pin a sheet-holding force of the die cushion to the tool is transferable. Furthermore, the invention relates to a press for forming a workpiece, a method for incorporating and adjusting a press during forming, a method for manufacturing a component and a component.

Presses are usually used for forming a workpiece for the manufacture of a component, wherein in particular the workpiece by a rectilinear relative movement of the tools, a pressing force is impressed. It is known to detect a pressing force via press force measuring devices in the press drive or in the press frame. However, only total forces or forces per pressure point are recorded here.

In addition, it is known to detect state variables locally in or on the tool. The disadvantage is the high cost of the sensor, since it must be provided for each tool. In addition, the long training period of tools and disturbances in the detection of state variables, in particular due to wear of the tools are disadvantageous. Furthermore, retrofitting a measuring device is not possible with incorporated tools without measuring device.

The DE 100 41 225 C2 discloses a method for adjusting the basic press height to the desired static pressing force by inserting an external calibration insert into an impact press, which has a measuring transducer for the pressing force. The calibration insert in the press is connected via cable to an electronic display device outside the press. After moving the press ram into its bottom dead center, the static force is measured via the calibration insert and a fine adjustment of the press base height is made over the length of the press ram.

The DE 10 2012 013 371 B4 describes a measuring device for a plunger pad, which is introduced instead of a tool in a press. The measuring device has a measuring module for determining the total pressing force and pressure pins protruding upward on the measuring module with force sensors for determining the force distribution in the surface of the measuring module.

In the DE 694 31 961 T2 A diagnostic method for diagnosing a press will be described, in which the detection of the amount of displacement of the pistons of the hydraulic balancing cylinder is used. The method requires a trial run for each specific die insert.

In the DE 10 2006 025 271 B3 a deep-drawing press is disclosed in which a pressure sensor for load detection in the working space of a hydraulic cylinder is installed and used for overload protection.

In the DE 36 40 507 C2 Sensors are arranged in the tool or in the sheet holder, which control via a control unit, the desired pressure change in the sheet holding cylinder depending on the respective drawing progress by means of proportional or servo valves.

The DE 10 2013 001 723 A1 discloses a press-bonded forming tool having a sensor for detecting sheet thickness or sheet movement.

A disadvantage of the measuring sensors and methods described above is that they can not be used for setting and / or optimizing presses during forming and / or during the incorporation of new tools. In addition, a detection of the force curve and / or the force distribution during a real forming and / or drawing process in a press is not possible.

The object of the invention is to improve the state of the art.

The object is achieved by a pressure pin for a press for forming a workpiece, wherein the pressure pin a die cushion and at least one tool can be assigned and by means of the pressure pin a force, in particular sheet holding force, from the die cushion to the tool is transferable, wherein the pressure pin at least one Has sensor for detecting at least one state variable.

As a result, a pressure pin is provided which can be used independently of the tool. Thus, the pressure pin machine related, in particular associated with a die cushion, can be used, so that the acting pressing forces during the forming can be detected.

In addition, the pressure pin with the sensor in existing presses can be retrofitted, in which this is replaced by conventional pressure pins. It is particularly advantageous that this is possible even with older presses with already older, incorporated tools.

Furthermore, the pressure pin can be standardized and customized depending on the application, with a high number of pieces can be realized.

An essential idea of the invention is that a pressure pin is provided with a sensor so that it can be used in a conventional press and before and / or during the forming process, the sensor detects a state variable and simultaneously the pressure pin sheet holding force of the die on the Tool transfers.

The following concept is explained:
A "pressure pin" (also called pressure pin) is in particular a metal pin which serves to transmit forces in a press. In particular, a pressure pin transmits a sheet holding force from the die cushion to a tool. In the driven thermoforming technique, pressure pins are arranged in particular also between the drawing punch (lower tool) and a die cushion in order to transfer the forces to the drawing punch by the movement of the die cushion.

A "press" is in particular a forming machine with rectilinear relative movement of the tools. In presses, in particular, a number of manufacturing processes, such as prototyping, forming, deep drawing, joining, coating, separating, cutting and changing material properties are carried out. In particular, a press is a bound, energy or force press. For deep drawing, the press may in particular have a pulling device.

"Forming" includes in particular all manufacturing processes in which metals and / or thermoplastics are selectively plastically brought into another form. During forming, in particular, a workpiece is formed into a component. Forming is understood to mean, in particular, pressure forming such as rolling and impressing, draw-press forming such as deep drawing, pressing and necking, draw forming such as lengths and widths, bending forming such as press bending, bending bending and circulation bending, and shear forming such as twisting and sliding.

A "workpiece" is in particular a largely solid object which is processed. A workpiece is for example a metal sheet or a circuit board.

A "die cushion" (also called a pulling device) is in particular a component of a press, which builds up the pulling force and influences it mechanically, as well as reduces the press ram impact on the workpiece. In particular, a defined pulling force is set via the die cushion in order to ensure a controlled subsequent flow of the material into the drawing die. In addition to the pressure build-up for the required pulling force allows a die cushion in particular a drawing process with programmable force over the depth of draw, the retreat at bottom dead center to prevent the springback upwards, and the start of a position for parts removal. To position and / or force adjustment, die cushion in particular double-acting hydraulic cylinder.

A "tool" in particular imposes a force on a starting material and / or a workpiece, which results in the starting material or the workpiece being transformed. A tool consists in particular of an upper tool and a lower tool. The use of the term tool in each case includes the corresponding antidote. A tool is in particular a molding tool.

The "sheet holding force" is in particular a force which is applied to a workpiece, for example a sheet metal or a circuit board, and / or a tool in order to prevent in particular the formation of folds on the drawn part.

A "sensor" (also called a detector, sensor or measuring sensor) is a technical component that captures in particular certain physical or chemical properties and / or a material quality of its environment quantitatively or qualitatively as a measured variable. A sensor detects a measured variable, in particular by means of physical or chemical effects, and converts these into a further processable, electrical signal. The measuring by the sensor can be carried out in particular according to different chemical and / or physical principles. For example, the pressure can be detected by means of a piezo pick-up, strain gauges (also called strain gauges) and / or pressure measurements in trapped liquids. Likewise, the measurement can be carried out according to optical principles, such as with a laser sensor for distance determination. The measuring of the sensor takes place in particular discretely and / or continuously. In particular, the sensor may be a multi-parameter sensor which receives different measured variables, for example, simultaneously measures a distance and the pressure.

A "state variable" is in particular a macroscopic physical and / or chemical variable which, together with other state variables, describes the state of a physical system. In particular, a state variable describes the state of the press and / or its components.

In a further embodiment, the at least one sensor measures at least one state variable, in particular a distance and / or a force and / or a pressure, optically and / or mechanically and / or electrically.

Thereby, the state of a component of the press and / or a workpiece is detected in a press. Thus, for example, by a distance measurement from a pressure pin installed in a press to the sheet demolding the position of a die cushion can be adjusted. In addition to measuring a distance and / or a force and / or a pressure, other chemical and / or physical parameters such as the temperature and / or the humidity can be detected.

In order to provide an independently usable and retrofittable pressure pin, the pressure pin has a power supply for supplying the sensor.

Thus, the pressure pin can be energetically configured and used independently of the tool and / or the machine.

Under "energy supply" is understood in particular the supply of a consumer with a line-bound energy. The power supply is in particular the supply of the sensor in the pressure pin with electrical energy (current / voltage). For this purpose, the pressure pin may for example have a battery.

It is particularly advantageous if the electrical supply periphery for the sensor is integrated in the bushing of a pressure pin in which the pressure pins are guided in order to minimize its wear. Thus, when replacing, for example, the supplying battery only a replacement of the liner is necessary without the pressure pin must be removed with the sensor.

In a further embodiment of the pressure pin, the pressure pin has a transmission element for contactless transmission of a state variable measured by the sensor to a device for data processing and / or evaluation.

As a result, a guide of a data cable, which must follow the movement of the pressure pin and / or the die cushion is not required.

In addition, contactless transmission of data allows a pressure pin with a sensor to be easily retrofitted into existing presses without the need for expensive data cable installation and management.

A "transmission element" is in particular an element which transmits data without contact and / or energy. In particular, the transmission element can receive and / or transmit data and / or energy. A transmission element may, for example, be a coupling coil.

In "contactless transmission" (also called wireless or wireless transmission), data and / or energy are transmitted without contact from one object to another object. The contactless transfer takes place in particular by electrical, magnetic and / or electromagnetic fields. For example, the contactless transmission can be carried out by light of a laser beam. Likewise, for example, the contactless transmission via a donor coil and a Nehmererspule done.

In a further aspect of the invention, the object is achieved by a press for forming a workpiece, wherein the press comprises a press ram, a die cushion and a tool, wherein a pressure pin is arranged on the die cushion, and the pressure pin is a pressure pin described above.

By using a pressure pin according to the invention in a press, it is possible to detect acting pressing forces in the press during forming. In particular, the force distribution, the force distribution and / or the course of the force distribution on a workpiece and / or a tool during the drawing process can be measured.

Thus it is possible to monitor and optimize the forming. As a result, forming can also take place in narrow process windows.

"Course" is understood to mean both the temporal and spatial (spatial) course.

Since, for example, the distribution of the plate holding forces is decisive for the quality of the components, a better quality of the manufactured component is possible with the press according to the invention.

The fact that the forces can be detected by means of the pressure pins of die cushion, a shortening of the incorporation of new tools in a training and / or production press is possible.

A "press ram" is in particular a displaceable component of the press, which transmits the kinetic energy of a drive as a pressing force to the workpiece. In this case, in particular the acceleration of the press ram and the ram stroke as a route of an up and down movement of the press ram crucial Process parameters during forming. A press ram has in particular an upper tool or is in operative contact with the upper tool.

In a further embodiment, the press has a device for contactless transmission of energy for supplying the sensor and / or data to and / or from the sensor of the pressure pin.

As a result, a power supply of the sensor of the pressure pin and / or a data transfer without line and data cable are possible. This prevents cables from becoming loose, twisting or becoming caught during movements of components in the press.

The device for the contactless transmission of energy and / or data, a pressure pin with a sensor in a simple manner in existing presses can be retrofitted.

A "device for contactless transmission" corresponds in its function in particular a transmission element defined above. The device for contactless transfer of the press in particular transfers energy from this device to the sensor of the pressure pin and / or transmits control and / or regulating signals to the sensor of the pressure pin and / or receives data from the sensor of the pressure pin.

In order to realize an optimal measurement, the press is arranged such that before and / or during movement of the die cushion and / or an acting force on the die cushion, the sensor of the pressure die measures a state variable.

Thus, a measurement adapted to the operation of the press by the sensor of the pressure pin is possible. In particular, the sensor of the pressure pin measures before operation and / or during operation of the press.

In a further embodiment, the press is set up in such a way that by means of the sensor of the pressure pin or of several sensors of a plurality of pressure pins a force profile, a force distribution and / or a course of a force distribution during the forming is or will be detected.

Thus, the change in force over time and / or over an area within the press can be detected. As a result, a continuous monitoring of the forming process and the forces acting on the workpiece and / or tool forces is possible.

In addition, this allows an optimization of the pressing force and / or the pressing forces during forming.

By detecting the force distribution and / or the associated force curve, an optimal pressure pin arrangement and / or execution can be determined and adjusted.

A "force curve" is in particular the change of a force over time and / or the place.

A "force distribution" is in particular the change of a force over a surface.

In a further embodiment, the press has a device for data processing and / or data evaluation and / or a device for controlling and / or regulating a pressing force of the press and / or moving the die cushion and / or moving the press ram on the basis of the measured state variable ,

As a result, the measured data can be used for timely control and / or for regulating the forming process. Thus, it is possible to specifically adapt the forces from hub to hub and / or distribute.

Through targeted process control and regulation, a reduced reject rate and lower wear and thus maintenance requirements can be achieved. For example, shortly before placing the upper tool on the workpiece, the movement of the press ram due to a measured distance and / or a measured pressure can be reduced, so that the tool-workpiece contact is not abrupt and thus the wear decreases. Likewise, the movement of the die cushion can be controlled on the basis of the detected state variable and, for example, the die cushion can be moved slightly in the opposite direction shortly before the upper die is put on.

Thus, the forming processes automatically run in the optimum range.

A "device for data processing and / or data evaluation" is in particular a device in which the detected state variables of the sensor are further processed and / or processed in order to obtain information. For example, a signal conditioning with downstream analog-to-digital converter is included.

In a "device for controlling and / or regulating", in particular the detected and / or processed and / or evaluated data are used to influence the forming process. Here is a "control" in particular a specification according to which variable, dynamic variables occurring in a press are influenced. By a control, an output variable is set in particular depending on an input variable. A "control" is, in particular, a targeted influencing of a variable in the press, wherein this variable must either be kept constant (fixed-value control) or be influenced in such a way that it follows in particular a predetermined time change (subsequent control). In particular, a regulation comprises the measurement of the variables to be influenced (controlled variable) and continuous comparison with the nominal value so that the output variable is fed back to the input. In particular, the device comprises a computer such as a controller or FPGAs (Field Programmable Gate Array).

• – Öffnen der Presse, insbesondere einer Einarbeitungspresse, Einbringen eines neuen Werkzeuges und eines Werkstückes in die Presse und gegebenenfalls Bestimmen eines Abstandes mittels des Sensors des Druckstiftes, insbesondere zwischen dem Sensor und einem Blechniederhalter,
• – gegebenenfalls Anpassen des gemessenen Abstandes an einen Sollwert durch eine Einrichtung zur Steuerung und/oder zur Regelung,
• – Betreiben der Presse und Bestimmen eines Kraftverlaufs, einer Kraftverteilung und/oder und/oder eines Verlaufs der Kraftverteilung mittels des Sensors des Druckstiftes oder eines weiteren Sensors eines weiteren Druckstiftes und/oder mehrerer Sensoren mehrerer Druckstifte und/oder Anpassen des Kraftverlaufs, der Kraftverteilung und/oder des Verlaufs der Kraftverteilung durch die Einrichtung zur Steuerung und/oder zur Regelung während des Umformens,
• – Öffnen der Presse und Ausbringen des umgeformten Bauteils und/oder Übertragen des eingestellten Abstandes und/oder des Kraftverlaufs, der Kraftverteilung und/oder des Verlaufs der Kraftverteilung auf eine weitere Presse, insbesondere eine Produktionspresse.

In an additional aspect of the invention, the object is achieved by a method for incorporating and adjusting a press during forming by means of a previously described pressure pin and a press or a previously described press, comprising the following steps:

• Opening the press, in particular an incorporation press, introducing a new tool and a workpiece into the press and optionally determining a distance by means of the sensor of the pressure pin, in particular between the sensor and a sheet demold,
• If appropriate, adaptation of the measured distance to a desired value by a device for controlling and / or regulating,
• - Operating the press and determining a force curve, a force distribution and / or a course of the force distribution by means of the sensor of the pressure pin or another sensor of another pressure pin and / or several sensors of several pressure pins and / or adjusting the force curve, the force distribution and / or the course of the force distribution by the means for controlling and / or regulating during the forming,
• - Opening the press and applying the deformed component and / or transmitting the set distance and / or the force curve, the force distribution and / or the course of the force distribution to another press, in particular a production press.

Thus, a pressure pin with a sensor or multiple pressure pins with multiple sensors can be advantageously used for testing and / or incorporation of new tools as well as for adjusting the distances and / or the pressing force in training and / or production presses.

Furthermore, the optimal arrangement of the pressure pins with respect to a new tool can be determined and adjusted.

In particular, short training periods can be realized in a training / tryout press. Thus, a new tool is optimally adjusted to the series production and prepared.

It is particularly advantageous that the geometrical distances and / or the force distribution, the force distribution and / or the course of the force distribution are transferred from the incorporation press to a duplicate in the production plant for series production.

In addition, various automations and process sequences can be "driven" and / or simulated on the incorporation press and thus the best course of the process can be determined. In addition to the training period at the introductory press, set-up and training times in production are also shortened.

By "incorporation" is meant in particular the adaptation of a new tool and / or a new forming process in a press. For incorporation, a separate incorporation press outside of production is used in particular. The incorporation comprises in particular the manual processing of the tool, the adjustment of the geometrical distances of the components of the press and / or the acting forces as well as the recording and optimization of the force distribution, the force distribution and / or the course of the force distribution during the forming.

By "setting" is meant in particular the adaptation of state variables and / or derived variables of a press. The setting takes place in particular for distances between components of the press and / or the force curve, the force distribution and / or the course of the force distribution during forming. The adjustment can be made in particular via a device for controlling and / or regulating the press.

In particular, the "setpoint" is the predetermined, targeted value of a quantitative feature of a system from which the actual actual value should deviate as little as possible. In a control loop, the nominal value of the controlled variable is the instantaneous value of the reference variable.

A "production press" is in particular a press in which the tool is incorporated and / or the geometric parameters and process parameters are already optimized and / or predetermined during the forming process. A production press is used in particular for the series production of a component.

In particular, a "sheet metal retainer" is a component of a press that imparts a force on a workpiece to prevent the formation of wrinkles on the drawn part.

• – Öffnen der Presse, Einbringen eines Werkstückes in die Presse und gegebenenfalls Bestimmen einer Zustandsgröße mittels des Sensors des Druckstiftes und/oder insbesondere Durchführen eines Hubes mit Umformprozess und dabei ein Erfassen des Verlaufes mindestens einer Zustandsgröße,
• – Übertragen der gemessenen Daten von dem Druckstift zu einer Einrichtung zur Datenaufbereitung und/oder Datenauswertung und/oder einer Einrichtung zur Steuerung und/oder zur Regelung,
• – Betreiben der Presse, Verteilen einer Presskraft auf dem Werkstück und/oder Einstellen eines Kraftverlaufs und/oder Einstellen eines Verlaufes einer Kraftverteilung während des Umformens aufgrund der gemessenen Zustandsgröße und/oder der gemessenen Zustandsgrößen,
• – und/oder Zuordnen der gemessenen Daten des Sensors des Druckstiftes zum Bauteil und/oder Speichern der gemessenen und/oder ausgewerteten Daten auf dem Bauteil und/oder derart speichern, dass die Daten zu einem späteren Zeitpunkt aufgrund einer Angabe auf dem Bauteil für einen Verwender zugeordnet zum Bauteil abrufbar sind und Ausbringen des gefertigten Bauteils aus der Presse.

In a further aspect, the object is achieved by a method for manufacturing a component by means of a previously described pressure pin and a press or a previously described press with the following steps:

• Opening of the press, introduction of a workpiece into the press and optionally determining a state variable by means of the sensor of the pressure pin and / or in particular performing a stroke with forming process and thereby detecting the course of at least one state variable,
• Transferring the measured data from the pressure pin to a device for data processing and / or data evaluation and / or a device for controlling and / or regulating,
• Operating the press, distributing a pressing force on the workpiece and / or setting a force curve and / or setting a progression of a force distribution during forming on the basis of the measured state variable and / or the measured state variables,
• - and / or associate the measured data of the sensor of the pressure pin to the component and / or storing the measured and / or evaluated data on the component and / or store such that the data at a later time due to an indication on the component for a user assigned to the component are retrievable and applying the finished component from the press.

Through this manufacturing process, an optimal production of a component with high quality and under optimized forming conditions and process parameters. As a result, both the wear of the tool and the finished component is minimized. In addition, narrow production windows can be realized.

It is particularly advantageous that the measured and / or evaluated data are assigned to the component or stored on the component, so that all production parameters can be retrieved together with the component.

In addition, in addition to the measured and / or processed data, additional information about the amount of lubricant used, number of strokes, temperature and other information can be assigned to the component and / or stored on the component.

As a result, the cause of increased wear can be found very quickly in a series of particularly susceptible components and repaired in the manufacturing process.

In an additional aspect of the invention, the object is achieved by a component, wherein the component using a previously described pressure pin and / or a previously described press and / or a previously described method for incorporation and adjustment of a press during forming and / or after previously described method for manufacturing a component is made.

Thus, a high-quality component is provided whose manufacture is reproducible at any time. In addition, a low-wear component is provided, since this was manufactured with optimum force during the forming process.

In a further embodiment of the component, the determined state variable and / or a force profile, a force distribution and / or a course of a force distribution and / or measured and / or evaluated data during / after a successful forming are stored on the component and / or are due to a Information on the component available to a user.

As a result, the state variables and process parameters used during the forming process are directly documented on the component and / or can be called up by a user of the component very easily and quickly. For example, a QR code with the coded data is applied to a component which will later be scanned by a user of the component and thus retrieve the data. Likewise, the component can be marked with an RFID system (Radio Frequency Identification) and the data read out.

Especially with critical and / or safety-relevant components, all production parameters are thus stored and / or documented.

A "user" is in particular a person and / or a machine, which continues to use or process the component. In particular, the user can assemble the component into a larger complex, for example in a car, or use it directly.

In another aspect, the object is achieved by a sensor element for a press for forming a workpiece, wherein the sensor element at least one pressure pin, a die cushion and at least one tool can be assigned and by means of the at least one pressure pin, a force from the die cushion to the tool is transferable , wherein with the aid of the sensor element is a size is measured, with which a force can be determined, which is transferable by means of the pressure pin.

Furthermore, the invention will be explained in more detail with reference to embodiments. Show it

1 a highly schematic sectional view of a pressure pin, and

2 a highly schematic representation of a deep-drawing press.

A pushpin 101 has a surrounding liner 102 on. At the top of the pressure bolt 101 is a laser sensor in the middle 105 admitted. Next to the laser sensor 105 points the pressure pin 101 a pressure sensor 106 on. The laser sensor 105 and the pressure sensor 106 are via a common power and data cable 104 with an inductive coil 103 inside the pressure bolt 101 connected.

The inductive coil 103 receives contactless energy and conducts it as electrical current via the power and data cable 104 to the pressure sensor 106 and the laser sensor 105 further.

Because the pressure pin 101 is not in an operative contact, measures the pressure sensor 106 the ambient pressure. The laser sensor 105 sends laser light in the measuring direction 107 and detects a remote counterpart, so that the distance between the laser sensor 105 and the counterpart. The measured signal is from the pushpin 101 by means of the coil 103 transmitted to an externally arranged data receiver.

A deep drawing press 201 has a drive 202 on, which with two pushers 203 is actively connected. The two plunger rods 203 are with a press ram 204 connected. At the press ram 204 is the ram stamp 206 arranged. On both sides of the ram punch 206 each sitting a drawing ring 205 , The pulling rings 205 and the ram stamp 206 sit above the sheet 207 ,

Below the sheet 207 are on both sides of the outer sides of sheet metal retainer 208 arranged. The sheet breakers 208 are each about a pressure pin 101 with a drawing cushion 211 operatively connected. The two pressure bolts 101 are through a press table 210 guided. The two pressure bolts 101 each have a pressure sensor 106 and a laser sensor 105 on. An inductive coil 103 is in each case in the pressure pin 101 Installed.

The drawing cushion 211 has three more pressure pins in the middle 222 on which at the top with the drawing punch 209 are connected. The three pressure pens 222 are through the press table 210 guided and each have a pressure sensor 216 and a current collector coil and data transmitter coil 218 on.

The drawing cushion 211 is powered by two double-acting hydraulic cylinders 212 worn, which are installed on the ground.

The deep drawing press 201 has a current transmitter coil and data collector coil 217 , a data preparation and evaluation unit 219 and a control unit 220 on.

In the deep-drawing press 201 it is an introductory press. The ram stamp 206 and the drawing punch 209 form a new tool.

The following operations are done with the deep-drawing press 201 implemented:
First, the deep drawing press 201 opened and the ram stamp 206 and the drawing punch 209 be in the deep drawing press 201 newly introduced. Subsequently, the sheet is 207 in the deep-drawing press 201 introduced and the press ram 204 over the drive 202 lowered, so the ram 206 and the pulling rings 205 flush with the sheet metal 207 issue.

By means of the laser sensors 215 in the pressure pin 101 which between the drawing cushion 211 and the sheet heaters 208 are arranged, the distance between the respective sensor and the respective sheet suppressor is measured.

The measured data are by means of the coils 103 in the two pressure bolts 201 to the externally arranged current generator coil and data transmitter coil 217 the deep drawing press 201 and continue in the data preparation and evaluation unit 219 further processed.

The processed signals are transmitted by means of the control unit 220 for adjusting the position of the die cushion 211 used, which is moved upwards by 3mm. Subsequently, the distance measurement by the distance sensors 215 and retransmitted and evaluated the collected data. A comparison with the target value shows that a further adjustment of the position of the die cushion 211 is not required.

Subsequently, the pressing process begins, with the outer pressure pin 101 and the center pressure pins 222 continuously by means of the pressure sensors 105 and 216 measure the pressure. For forming the sheet 207 becomes the die-cushion 211 continuously slow over the double-acting hydraulic cylinders 212 pushed up so that the drawing punch 209 Slowly the sheet metal 207 approaches. After the first contact of the drawing punch 209 with the sheet 207 Continually the force distribution and the force curve for each central pressure pin 222 determined from the collected, transmitted and evaluated data and used to control the forming process.

After the sheet 207 in the middle completely through the drawing punch 209 in the opposite form of the ram stamp 206 was deep drawn, moves the die cushion 211 by means of the double-acting hydraulic cylinder 212 back down and the finished component is deployed.

Subsequently, the finished component is provided with a sticker which has a QR code, so that all distance data, the force curve and the power flow of each pressure pin 101 and every push pin 222 can be retrieved with the component.

After the above procedure on several sheets 207 repeated and the drawing punch 209 was reworked manually, are the optimal process parameters with respect to the force curve and the force distribution and thus the arrangement of the pressure pin 101 and the pressure pens 222 certainly. These are combined with the determined geometric distances from the incorporation press 201 transferred to a production press for serial production.

LIST OF REFERENCE NUMBERS

101

 pushpin

102

 liner

103

 inductive coil

104

 Power and data cables

105

 laser sensor

106

 pressure sensor

107

 Measuring direction of the laser sensor

201

 Deep Drawing Press

202

 drive

203

 Stößelpleuel

204

 press ram

205

 drawing ring

206

 ram temple

207

 sheet

208

 Sheet hold-down

209

 drawing punch

210

 press table

211

 cushion

212

 double acting hydraulic cylinder

216

 pressure sensor

217

 Current sensor coil and data collector coil

218

 Current collector coil and data transmitter coil

219

 Data processing and evaluation unit

220

 Control and regulation unit

222

 pushpin

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

• DE 10041225 C2 [0004]
• DE 102012013371 B4 [0005]
• DE 69431961 T2 [0006]
• DE 102006025271 B3 [0007]
• DE 3640507 C2 [0008]
• DE 102013001723 A1 [0009]

Claims (14)

Push pin ( 101 . 222 ) for a press for forming a workpiece ( 207 ), wherein the pressure pin a die cushion ( 211 ) and at least one tool ( 206 . 209 ) and by means of the pressure pin, a force, in particular a sheet-holding force, from the die cushion to the tool is transferable, characterized in that the pressure pin at least one sensor ( 105 . 106 . 216 ) for detecting at least one state variable. Pressure pin according to one of the preceding claims, characterized in that the at least one sensor measures the at least one state variable, in particular a distance and / or a force and / or a pressure, optically and / or mechanically and / or electrically. Pressure pin according to one of the preceding claims, characterized in that the pressure pin is a power supply ( 103 ) for supplying the sensor. Pressure pin according to one of the preceding claims, characterized in that the pressure pin is a transmission element ( 218 ) for non-contact transmission of a state variable measured by the sensor to a device for data processing and / or data evaluation. Press ( 201 ) for forming a workpiece, wherein the press a press ram ( 204 ), a die cushion ( 211 ) and a tool ( 206 . 209 ), Wherein a pressure pin is arranged on the die cushion, characterized in that the pressure pin is a push pin according to any one of the preceding claims. Press according to claim 5, characterized in that the press comprises a device for contactless transmission ( 217 ) of energy for supplying the sensor and / or data to and / or from the sensor of the pressure pin has. Press according to one of the preceding claims, characterized in that the press is arranged such that before and / or during a movement of the die cushion and / or an acting force on the die cushion, the sensor of the pressure pin measures a state variable. Press according to one of the preceding claims, characterized in that the press is set up such that a force curve, a force distribution and / or a course of a force distribution during the forming is or are detected by means of the sensor of the pressure pin or more sensors of several pressure pins. Press according to one of the preceding claims, characterized in that the press a device for data processing and / or data evaluation ( 219 ) and / or a device for controlling and / or regulating ( 220 ) a pressing force or a die cushion force of the press and / or moving the die cushion and / or moving the press ram due to the measured state quantity. Method of incorporating and adjusting a press during forming by means of a pressure pin according to one of claims 1 to 4 and a press or a press according to one of claims 5 to 9, comprising the following steps: Opening the press, in particular an incorporation press, introducing a new tool and a workpiece into the press and in particular determining a distance by means of the sensor of the pressure pin, in particular between the sensor and a sheet demold, In particular adaptation of the measured distance to a desired value by a device for controlling and / or regulating, - Operating the press and determining a force curve of the force distribution and / or the course of the force distribution by means of the sensor of the pressure pin or another sensor of another pressure pin and / or multiple sensors of several pressure pins and / or adjusting the force curve, the force distribution and / or the course the force distribution through the device for controlling and / or regulating during the forming, - Opening the press and applying the deformed component and / or transmitting the set distance and / or the force curve, the force distribution and / or the course of the force distribution to another press, in particular a production press. A method for manufacturing a component by means of a pressure pin according to one of claims 1 to 4 and a press or a press according to one of claims 5 to 9, comprising the following steps: - opening the press, introducing a workpiece into the press and performing a stroke with forming process and detecting a course of at least one state variable, - transferring the measured data from the pressure pin to a device for data processing and / or data evaluation and / or a device for controlling and / or regulating, - operating the press, distributing a pressing force on the workpiece and / or setting a force profile and / or adjusting the course of a force distribution during the forming due to the measured state variable or the measured state variables, - and / or assigning the measured data of the sensor of the pressure pin to the component and / or Store the measured and / or evaluated data on the component and / or store such that the data can be assigned to the component at a later time based on an indication on the component, and applying the finished component from the press. Component, characterized in that the component is manufactured using a pressure pin according to one of claims 1 to 4 and / or a press according to one of claims 5 to 9 and / or a method according to claim 10 and / or a method according to claim 11 , Component according to claim 12, characterized in that the specific state variable and / or a force curve, a force distribution and / or a course of a force distribution and / or measured and / or evaluated data during / after a successful forming are stored on the component and / or due to an indication on the component for a user are available. Sensor element for a press for forming a workpiece ( 207 ), wherein the sensor element at least one pressure pin, a die cushion ( 211 ) and at least one tool ( 206 . 209 ) can be assigned and by means of the at least one pressure pin, a force from the die cushion to the tool is transferable, characterized in that with the aid of the sensor element, a variable is measured with which a force can be determined, which is transferable by means of the pressure pin.

Images