EP3969198B1 - Cooling device with a spray head for cooling lubrication of a die of a forming machine and forming process - Google Patents

Cooling device with a spray head for cooling lubrication of a die of a forming machine and forming process Download PDF

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Publication number
EP3969198B1
EP3969198B1 EP20727946.4A EP20727946A EP3969198B1 EP 3969198 B1 EP3969198 B1 EP 3969198B1 EP 20727946 A EP20727946 A EP 20727946A EP 3969198 B1 EP3969198 B1 EP 3969198B1
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European Patent Office
Prior art keywords
die
upper die
lower die
nozzles
forming machine
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EP20727946.4A
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German (de)
French (fr)
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EP3969198A1 (en
Inventor
Axel ROSSBACH
Erdem Karakas
Andreas Brenner
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SMS Group GmbH
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SMS Group GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00—Arrangements for heating or cooling during processing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0088—Lubricating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor

Definitions

  • the present invention relates to a cooling device with a spray head for cooling lubrication of a lower die and/or an upper die of a forming machine, a forming machine with such a cooling device and a forming method.
  • a spray head for cooling lubrication of at least one die of a forming machine having a lower die and an upper die is known in the form of a closed-die forging press, which is introduced between two working strokes into a working space between the lower and upper die and carries at least one two-component nozzle, which has a mixture of spray agent and Spray air is atomized onto the die and is connected to at least one feed channel, via which a control fluid, the mixture, spray agent or spray air can be fed to the two-component nozzle and which extends to a spray head base that carries a supply connection, which is connected to the feed channel.
  • the at least one two-component nozzle of the known spray head has a one-piece nozzle body
  • DE 196 48 708 A1 describes a device for cooling lubrication of at least one die of a forming machine, which consists of several individual tools in the form of engravings or molds. If the individual tools are free of workpieces, spray nozzles can be inserted into the individual tools.
  • spray nozzles which are part of a coolant supply, are provided for each individual tool of the known forming machine. In the coolant supply, each spray nozzle is assigned a control valve and the control valves are connected to a computer setting device via a control line. Furthermore, a thermal imaging camera is arranged laterally outside the area in which the individual tools are moved toward one another.
  • the thermal imaging camera records an actual value thermal image from the side or surface of the tool that it can see, which includes every point on this side or surface of the tool.
  • selected points are evaluated as measuring points to which the spray nozzles are assigned are.
  • the individual tools are cooled directly or indirectly at the measuring points.
  • the coolant supply is moved away from the working area of the individual tools and another working stroke of the forming machine takes place, during which warm workpieces are placed in the tool and formed in the tool.
  • the pamphlet JP 2015 150617 A discloses a cooling device according to the preamble of claim 1, namely with a spray head for cooling lubrication of a lower die and/or an upper die of a forming machine, the spray head being insertable into a working space between the lower die and the upper die between two working strokes.
  • the spray head has at least two individually controllable nozzles for cooling lubrication at different points on a die surface of the lower die and/or the upper die.
  • the spray head is equipped with a thermal imaging camera to record a thermal image of the lower die and/or the upper die.
  • the pamphlet DE 10 2010 014952 A1 discloses a forming method according to the preamble of claim 7, in which a workpiece is cyclically pressed between a lower die and an upper die of a forming machine. The workpiece is then ejected from the forming machine and a spray head has at least two individually controllable nozzles for cooling lubrication at different points on a die surface of the lower die and/or the upper die.
  • a thermal imaging camera for recording a thermal image of the lower die and/or the upper die is introduced into the working space between the lower die and the upper die and a thermal image of the lower die and/or the upper die is recorded. Based on the thermal image, individual spray times of the individually controllable nozzles are determined. With the spray nozzles and the individually determined spraying times, the areas of the die surface of the lower die and/or the upper die are cool lubricated.
  • a next workpiece is then loaded into the forming machine.
  • the present invention is therefore based on the object of specifying a device and a method with which a more targeted cooling of the thermally most stressed areas of the molds is made possible.
  • a spray head for cooling lubrication of a lower die and/or an upper die of a forming machine can be introduced between two working strokes into a working space between the lower die and the upper die and has at least two individually controllable nozzles for cooling lubrication of different points on a die surface of the lower die and/or the upper die.
  • the spray head can also have a significantly higher number of individually controllable nozzles. The larger the number of nozzles selected, the smaller the surface area of the lower die or upper die that can be selected to be cooled by means of the respective nozzle. This can allow different locations of the respective die to be cooled differently.
  • the spray head has a thermal imaging camera for recording a thermal image of the lower die and/or the upper die.
  • the arrangement of the thermal imaging camera on the spray head makes it easier to record the thermal image of the lower die and/or the upper die compared to a lateral arrangement of the thermal imaging camera next to the forming machine. Furthermore, this arrangement can allow the thermal image to be recorded during the introduction of the spray head. A waiting time to record the thermal image before inserting the spray head can thus be avoided. It is also conceivable to continuously record thermal images of the die while the spray head is being introduced. In this way, if necessary, a change in local surface temperatures of the die over time can also be determined.
  • the individually controllable nozzles are designed as a one-piece assembly.
  • the individually controllable nozzles and supply channels, via which a cooling fluid or a cooling fluid mixture can be supplied to the nozzles can be designed as a one-piece assembly. Leaks at connection points can be avoided in this way.
  • the individually controllable nozzles, supply channels, via which a cooling fluid or a cooling fluid mixture can be supplied to the nozzles, and a mount for the thermal imaging camera can be designed as a one-piece assembly. This means that the position of the thermal imaging camera in relation to the nozzles for cooling lubrication can already be specified during the production of the spray head.
  • the proposed one-piece assembly can be produced in particular by means of 3D printing.
  • 3D printing to create the assembly can result in a lighter spray head that is easier and quicker to insert and retract from the work envelope due to its lower mass.
  • 3D printing simplifies adjustment of the spray head to changing geometries of the lower and/or upper die.
  • a cooling device which, in addition to a spray head described above, has a control unit for determining individual spraying times of the individually controllable nozzles as a function of the thermal image.
  • the spraying times can be selected in such a way that the surface temperature is as uniform as possible after the spraying process. For example, very hot areas of the lower and/or upper die can be cooled more than other areas. A surface temperature that is as uniform as possible can have a positive effect on the service lives of the lower and upper dies. The total consumption of spray agent can also be reduced due to the need-based, individual spraying times.
  • the control unit of the cooling device also has a memory for storing the thermal image. This enables continuous monitoring of the forming process on the basis of stored thermal images over several clock cycles, so that errors can be identified before the lower and/or upper die can no longer be used. It is also conceivable to improve the die geometry based on the continuously collected thermal images.
  • a forming machine with a cooling device as described above with a lower die and with an upper die can enable shorter cycle times compared to conventional forming machines.
  • the lower and/or upper die can be used longer and downtimes of the forming machine can be reduced.
  • a forming method is proposed in which a workpiece is cyclically pressed between the lower die and the upper die, the workpiece is ejected from the forming machine, a spray head with at least two individually controllable nozzles for cooling lubrication of different points of a die surface of the lower die and/or the upper die and with a thermal imaging camera to record a thermal image of the lower die and/or the upper die in the work area is introduced between the lower die and the upper die, a thermal image of the lower die and/or the upper die is recorded, individual spray times of the individually controllable nozzles are determined based on the thermal image, positions of the die surface of the lower die and/or with the spray nozzles for the individually determined spray times of the upper die are cool-lubricated and a next workpiece is loaded into the forming machine.
  • the individual spraying times can be determined in particular based on maximum values of the thermal image in such a way that a uniform surface temperature of the lower die and/or upper die is obtained after the cooling lubrication.
  • a forming machine with a lower die UG and an upper die OG is shown, between which a workpiece can be pressed.
  • a spray head SK is retracted into the open working space AR of the forming machine UM.
  • the spray head has several nozzles DU for cooling lubrication of the surface of the lower die UG and several nozzles DO for cooling the upper die OG.
  • the nozzles UG and OG can each be controlled individually.
  • the spray head SK also has two thermal imaging cameras KU and KO, with which thermal images of the surface of the lower die UG and the upper die OG can be recorded.
  • the individually controllable nozzles DU and DO, supply channels (not shown) through which a cooling fluid or a cooling fluid mixture can be supplied to the nozzles, and the mounts for the thermal imaging cameras (KU, KO) are designed as a one-piece assembly.
  • the one-piece assembly was produced using a 3D printing process.
  • the cooling device has a control unit KE, with which individual spraying times for the individually controllable nozzles DU and DO can be determined based on the thermal imaging camera KU and the thermal imaging camera KO. In this way, particularly hot areas of the lower die and/or the upper die can be cooled longer than areas that are subjected to less thermal stress, and the service life of the dies can thus be extended.
  • the control unit also has a memory in which the thermal images and/or the calculated spray times can be stored over a number of working cycles of the forming machine. This enables deviations to be detected early and downtimes of the forming machine to be reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Die vorliegende Erfindung betrifft eine Kühlvorrichtung mit einem Sprühkopf zur Kühlschmierung eines Untergesenkes und/oder eines Obergesenkes einer Umformmaschine, eine Umformmaschine mit einer solchen Kühlvorrichtung sowie ein Umformverfahren.The present invention relates to a cooling device with a spray head for cooling lubrication of a lower die and/or an upper die of a forming machine, a forming machine with such a cooling device and a forming method.

Aus der DE 10 2015 114 202 A1 ist ein Sprühkopf zur Kühlschmierung mindestens eines Gesenks einer ein Untergesenk und ein Obergesenk aufweisenden Umformmaschine in Form einer Gesenkschmiedepresse bekannt, der zwischen zwei Arbeitshüben in einen Arbeitsraum zwischen Unter- und Obergesenk eingebracht wird und wenigstens eine Zweistoffdüse trägt, die zur Kühlschmierung ein Gemisch aus Sprühmittel und Sprühluft auf das Gesenk zerstäubt und mit wenigstens einem Zuführkanal verbunden ist, über welchen ein Steuerfluid, das Gemisch, Sprühmittel oder Sprühluft der Zweistoffdüse zugeführt werden kann und der bis zu einem Sprühkopffuß reicht, der einen Versorgungsanschluss trägt, welcher mit dem Zuführkanal verbunden ist. Die wenigstens eine Zweistoffdüse des bekannten Sprühkopfs weist einen einstückig ausgebildeten Düsenkörper aufFrom the DE 10 2015 114 202 A1 a spray head for cooling lubrication of at least one die of a forming machine having a lower die and an upper die is known in the form of a closed-die forging press, which is introduced between two working strokes into a working space between the lower and upper die and carries at least one two-component nozzle, which has a mixture of spray agent and Spray air is atomized onto the die and is connected to at least one feed channel, via which a control fluid, the mixture, spray agent or spray air can be fed to the two-component nozzle and which extends to a spray head base that carries a supply connection, which is connected to the feed channel. The at least one two-component nozzle of the known spray head has a one-piece nozzle body

In der DE 196 48 708 A1 wird eine Vorrichtung zur Kühlschmierung mindestens eines Gesenks einer Umformmaschine beschrieben, welches aus mehreren Einzelwerkzeugen in Form von Gravuren bzw. Formen besteht. Wenn die Einzelwerkzeuge frei von Werkstücken sind, können in die Einzelwerkzeuge Sprühdüsen eingefahren werden. Pro Einzelwerkzeug der bekannten Umformmaschine sind mehrere Sprühdüsen vorgesehen, die Bestandteil einer Kühlmittelzuführung sind. In der Kühlmittelzuführung ist jeder Sprühdüse ein Steuerventil zugeordnet und die Steuerventile sind über eine Steuerleitung an ein Rechner-Einstell-Gerät angeschlossen. Weiter ist seitlich außerhalb des Bereichs, in dem die Einzeiwerkzeuge aufeinander zu gefahren werden, eine Wärmebildkamera angeordnet. Die Wärmebildkamera nimmt von der von ihr einsehbaren Seite bzw. Fläche des Werkzeugs ein Istwert-Wärmebild auf, welches jede Stelle dieser Seite bzw. Fläche des Werkzeugs umfasst. Im Gerät werden ausgesuchte Stellen als Messstellen bewertet, denen die Sprühdüsen zugeordnet sind. Mit den Sprühdüsen werden die Einzelwerkzeuge unmittelbar oder mittelbar an den Messstellen gekühlt. Wenn die Kühlung der Einzelwerkzeuge erfolgt ist, wird die Kühlmittelzuführung aus dem Arbeitsbereich der Einzelwerkzeuge wegbewegt und es erfolgt ein weiterer Arbeitshub der Umformmaschine, bei dem warme Werkstücke in das Werkzeug eingelegt und in dem Werkzeug umgeformt werden.In the DE 196 48 708 A1 describes a device for cooling lubrication of at least one die of a forming machine, which consists of several individual tools in the form of engravings or molds. If the individual tools are free of workpieces, spray nozzles can be inserted into the individual tools. Several spray nozzles, which are part of a coolant supply, are provided for each individual tool of the known forming machine. In the coolant supply, each spray nozzle is assigned a control valve and the control valves are connected to a computer setting device via a control line. Furthermore, a thermal imaging camera is arranged laterally outside the area in which the individual tools are moved toward one another. The thermal imaging camera records an actual value thermal image from the side or surface of the tool that it can see, which includes every point on this side or surface of the tool. in the device, selected points are evaluated as measuring points to which the spray nozzles are assigned are. With the spray nozzles, the individual tools are cooled directly or indirectly at the measuring points. When the individual tools have been cooled, the coolant supply is moved away from the working area of the individual tools and another working stroke of the forming machine takes place, during which warm workpieces are placed in the tool and formed in the tool.

Die Druckschrift JP 2015 150617 A offenbart eine Kühlvorrichtung gemäß dem Oberbegriff des Anspruchs 1, nämlich mit einem Sprühkopf zur Kühlschmierung eines Untergesenkes und / oder eines Obergesenkes einer Umformmaschine, wobei der Sprühkopf zwischen zwei Arbeitshüben in einen Arbeitsraum zwischen dem Untergesenk und dem Obergesenk einbringbar ist. Der Sprühkopf weist wenigstens zwei einzeln ansteuerbare Düsen zur Kühlschmierung unterschiedlicher Stellen einer Gesenkoberfläche des Untergesenks und / oder des Obergesenks auf. Weiterhin ist der Sprühkopf mit einer Wärmebildkamera zur Aufnahme eines Wärmebildes des Untergesenks und / oder des Obergesenks ausgerüstet.The pamphlet JP 2015 150617 A discloses a cooling device according to the preamble of claim 1, namely with a spray head for cooling lubrication of a lower die and/or an upper die of a forming machine, the spray head being insertable into a working space between the lower die and the upper die between two working strokes. The spray head has at least two individually controllable nozzles for cooling lubrication at different points on a die surface of the lower die and/or the upper die. Furthermore, the spray head is equipped with a thermal imaging camera to record a thermal image of the lower die and/or the upper die.

Die Druckschrift DE 10 2010 014952 A1 offenbart ein Umformverfahren gemäß dem Oberbegriff des Anspruchs 7, bei welchem zyklisch ein Werkstück zwischen einem Untergesenk und einem Obergesenk einer Umformmaschine gepresst wird. Das Werkstück wird anschließend aus der Umformmaschine ausgestoßen und ein Sprühkopf weist wenigstens zwei einzeln ansteuerbaren Düsen zur Kühlschmierung unterschiedlicher Stellen einer Gesenkoberfläche des Untergesenks und / oder des Obergesenks auf. Eine Wärmebildkamera zur Aufnahme eines Wärmebildes des Untergesenks und / oder des Obergesenks wird in den Arbeitsraum zwischen dem Untergesenk und dem Obergesenk eingebracht und ein Wärmebild des Untergesenks und / oder des Obergesenks wird aufgenommen. Basierend auf dem Wärmebild werden individuelle Sprühzeiten der einzeln ansteuerbaren Düsen bestimmt. Mit den Sprühdüsen und den individuell bestimmten Sprühzeiten werden die Stellen der Gesenkoberfläche des Untergesenks und / oder des Obergesenks kühlgeschmiert. Anschließend wird ein nächstes Werkstück in die Umformmaschine geladen.The pamphlet DE 10 2010 014952 A1 discloses a forming method according to the preamble of claim 7, in which a workpiece is cyclically pressed between a lower die and an upper die of a forming machine. The workpiece is then ejected from the forming machine and a spray head has at least two individually controllable nozzles for cooling lubrication at different points on a die surface of the lower die and/or the upper die. A thermal imaging camera for recording a thermal image of the lower die and/or the upper die is introduced into the working space between the lower die and the upper die and a thermal image of the lower die and/or the upper die is recorded. Based on the thermal image, individual spray times of the individually controllable nozzles are determined. With the spray nozzles and the individually determined spraying times, the areas of the die surface of the lower die and/or the upper die are cool lubricated. A next workpiece is then loaded into the forming machine.

Es hat sich gezeigt, dass mit der bekannten Vorrichtung zur Kühlschmierung häufig nur eine mittelbare Kühlung der Einzelwerkzeuge an den thermisch am meisten belasteten Stellen möglich ist.It has been shown that with the known device for cooling lubrication, often only indirect cooling of the individual tools at the thermally most stressed points is possible.

Ausgehend von dem bekannten Stand der Technik liegt der vorliegenden Erfindung folglich die Aufgabe zugrunde, eine Vorrichtung und ein Verfahren anzugeben, mit welchem eine gezieltere Kühlung der thermisch am meisten belasteten Stellen der Formen ermöglicht wird.Proceeding from the known state of the art, the present invention is therefore based on the object of specifying a device and a method with which a more targeted cooling of the thermally most stressed areas of the molds is made possible.

Erfindungsgemäß wird diese Aufgabe durch den Gegenstand des Haupt- und der Nebenansprüche gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.According to the invention, this object is achieved by the subject matter of the main and dependent claims. Advantageous configurations are specified in the dependent claims.

Ein Sprühkopf zur Kühlschmierung eines Untergesenkes und/oder eines Obergesenkes einer Umformmaschine ist zwischen zwei Arbeitshüben in einen Arbeitsraum zwischen dem Untergesenk und dem Obergesenk einbringbar und weist wenigstens zwei einzeln ansteuerbare Düsen zur Kühlschmierung unterschiedlicher Stellen einer Gesenkoberfläche des Untergesenks und/oder des Obergesenks auf. Der Sprühkopf kann auch eine deutlich höhere Anzahl einzeln ansteuerbarer Düsen aufweisen. Je größer die Anzahl der Düsen gewählt wird desto kleiner kann die mittels der jeweiligen Düse gekühlte Oberfläche des Untergesenks bzw. Obergesenks gewählt werden. Dies kann es erlauben, unterschiedliche Stellen des jeweiligen Gesenks unterschiedlich zu kühlen. Der Sprühkopf weist eine Wärmebildkamera zur Aufnahme eines Wärmebildes des Untergesenks und/oder des Obergesenks auf. Die Anordnung der Wärmebildkamera am Sprühkopf erleichtert die Aufnahme des Wärmebilds des Untergesenks und/oder des Obergesenks gegenüber einer seitlichen Anordnung der Wärmebildkamera neben der Umformmaschine. Weiter kann es diese Anordnung erlauben, das Wärmebild während des Einbringens des Sprühkopfes aufzunehmen. Eine Wartezeit zum Aufnehmen des Wärmebilds vor dem Einbringen des Sprühkopfes kann somit vermieden werden. Es ist auch denkbar, während des Einbringens des Sprühkopfs kontinuierlich Wärmebilder des Gesenks aufzunehmen. Auf diese Weise kann ggf. auch eine zeitliche Änderung lokaler Oberflächentemperaturen des Gesenks festgestellt werden.A spray head for cooling lubrication of a lower die and/or an upper die of a forming machine can be introduced between two working strokes into a working space between the lower die and the upper die and has at least two individually controllable nozzles for cooling lubrication of different points on a die surface of the lower die and/or the upper die. The spray head can also have a significantly higher number of individually controllable nozzles. The larger the number of nozzles selected, the smaller the surface area of the lower die or upper die that can be selected to be cooled by means of the respective nozzle. This can allow different locations of the respective die to be cooled differently. The spray head has a thermal imaging camera for recording a thermal image of the lower die and/or the upper die. The arrangement of the thermal imaging camera on the spray head makes it easier to record the thermal image of the lower die and/or the upper die compared to a lateral arrangement of the thermal imaging camera next to the forming machine. Furthermore, this arrangement can allow the thermal image to be recorded during the introduction of the spray head. A waiting time to record the thermal image before inserting the spray head can thus be avoided. It is also conceivable to continuously record thermal images of the die while the spray head is being introduced. In this way, if necessary, a change in local surface temperatures of the die over time can also be determined.

In einer ersten Ausgestaltung des Sprühkopfs sind die einzeln ansteuerbaren Düsen als einstückige Baugruppe ausgebildet sind. Insbesondere können die einzeln ansteuerbaren Düsen und Zuführkanäle, über welche ein Kühlfluid oder ein Kühlfluidgemisch den Düsen zugeführt werden kann, als einstückige Baugruppe ausgebildet sind. Undichtigkeiten an Verbindungsstellen können auf diese Weise vermieden werden.In a first embodiment of the spray head, the individually controllable nozzles are designed as a one-piece assembly. In particular, the individually controllable nozzles and supply channels, via which a cooling fluid or a cooling fluid mixture can be supplied to the nozzles, can be designed as a one-piece assembly. Leaks at connection points can be avoided in this way.

Weiter können die einzeln ansteuerbaren Düsen, Zuführkanäle, über welche ein Kühlfluid oder ein Kühlfluidgemisch den Düsen zugeführt werden kann, und eine Aufnahme für die Wärmebildkamera als einstückige Baugruppe ausgebildet. Damit kann bereits bei der Herstellung des Sprühkopfes die Position der Wärmebildkamera in Bezug auf die Düsen zur Kühlschmierung fest vorgegeben werden.Furthermore, the individually controllable nozzles, supply channels, via which a cooling fluid or a cooling fluid mixture can be supplied to the nozzles, and a mount for the thermal imaging camera can be designed as a one-piece assembly. This means that the position of the thermal imaging camera in relation to the nozzles for cooling lubrication can already be specified during the production of the spray head.

Die vorgeschlagene einstückige Baugruppe kann insbesondere mittels 3D-Druck hergestellt werden. Die Verwendung des 3D-Drucks zur Herstellung der Baugruppe kann zu einem leichteren Sprühkopf führen, der aufgrund seiner geringeren Masse einfacher und schneller in den Arbeitsraum eingebraucht und wieder aus diesem ausgefahren werden kann. Zudem vereinfacht der 3D-Druck eine Anpassung des Sprühkopfs an wechselnde Geometrien des Unter- und/oder Obergesenks.The proposed one-piece assembly can be produced in particular by means of 3D printing. Using 3D printing to create the assembly can result in a lighter spray head that is easier and quicker to insert and retract from the work envelope due to its lower mass. In addition, 3D printing simplifies adjustment of the spray head to changing geometries of the lower and/or upper die.

Weiter wird eine Kühlvorrichtung vorgeschlagen, die neben einem oben beschriebenen Sprühkopf eine Kontrolleinheit zur Bestimmung von individuellen Sprühzeiten der einzeln ansteuerbaren Düsen in Abhängigkeit des Wärmebildes aufweist. Die Sprühzeiten können insbesondere so gewählt werden, dass nach dem Sprühvorgang eine möglichst gleichmäßige Oberflächentemperatur herrscht. Beispielsweise können sehr heiße Stellen des Unter- und/oder Obergesenks stärker gekühlt werden als andere Bereiche. Eine möglichst gleichmäßige Oberflächentemperatur kann sich günstig auf die Standzeiten der Unter- und Obergesenke auswirken. Ebenso kann aufgrund der bedarfsgerechteren, individuellen Sprühzeiten der Gesamtsprühmittelverbrauch reduziert werden.Furthermore, a cooling device is proposed which, in addition to a spray head described above, has a control unit for determining individual spraying times of the individually controllable nozzles as a function of the thermal image. In particular, the spraying times can be selected in such a way that the surface temperature is as uniform as possible after the spraying process. For example, very hot areas of the lower and/or upper die can be cooled more than other areas. A surface temperature that is as uniform as possible can have a positive effect on the service lives of the lower and upper dies. The total consumption of spray agent can also be reduced due to the need-based, individual spraying times.

Die Kontrolleinheit der Kühlvorrichtung weist weiter einen Speicher zum Speichern des Wärmebildes auf. Dies ermöglicht eine kontinuierliche Überwachung des Umformverfahrens auf Basis von gespeicherten Wärmebilder über mehrere Taktzyklen hinweg, so dass Fehler erkennbar werden, bevor das Unter- und/oder Obergesenk nicht mehr nutzbar ist. Es ist ebenfalls denkbar basierend auf den kontinuierlich gesammelten Wärmebildern die Gesenkgeometrie zu verbessern.The control unit of the cooling device also has a memory for storing the thermal image. This enables continuous monitoring of the forming process on the basis of stored thermal images over several clock cycles, so that errors can be identified before the lower and/or upper die can no longer be used. It is also conceivable to improve the die geometry based on the continuously collected thermal images.

Eine Umformmaschine mit einer oben beschriebenen Kühlvorrichtung mit einem Untergesenk und mit einem Obergesenk kann gegenüber herkömmlichen Umformmaschinen kürzere Taktzeiten ermöglichen. Darüber hinaus können aufgrund einer besseren Einschätzung des Verschleißprozesses das Unter- und/oder Obergesenk länger verwendet werden und Stillstandzeiten der Umformmaschine verkürzt werden.A forming machine with a cooling device as described above with a lower die and with an upper die can enable shorter cycle times compared to conventional forming machines. In addition, due to a better assessment of the wear process, the lower and/or upper die can be used longer and downtimes of the forming machine can be reduced.

Weiter wird ein Umformverfahren vorgeschlagen, bei welchem zyklisch ein Werkstück zwischen dem Untergesenk und dem Obergesenk gepresst wird, das Werkstück aus der Umformmaschine ausgestoßen wird, ein Sprühkopf mit wenigstens zwei einzeln ansteuerbaren Düsen zur Kühlschmierung unterschiedlicher Stellen einer Gesenkoberfläche des Untergesenks und/oder des Obergesenks und mit einer Wärmebildkamera zur Aufnahme eines Wärmebildes des Untergesenks und/oder des Obergesenks in den Arbeitsraum zwischen dem Untergesenk und dem Obergesenk eingebracht wird, ein Wärmebild des Untergesenks und/oder des Obergesenks aufgenommen wird, basierend auf dem Wärmebild individuelle Sprühzeiten der einzeln ansteuerbaren Düsen bestimmt werden, mit den Sprühdüsen für die individuell bestimmten Sprühzeiten Stellen der Gesenkoberfläche des Untergesenks und/oder des Obergesenks kühlgeschmiert werden und ein nächstes Werkstück in die Umformmaschine geladen wird.Furthermore, a forming method is proposed in which a workpiece is cyclically pressed between the lower die and the upper die, the workpiece is ejected from the forming machine, a spray head with at least two individually controllable nozzles for cooling lubrication of different points of a die surface of the lower die and/or the upper die and with a thermal imaging camera to record a thermal image of the lower die and/or the upper die in the work area is introduced between the lower die and the upper die, a thermal image of the lower die and/or the upper die is recorded, individual spray times of the individually controllable nozzles are determined based on the thermal image, positions of the die surface of the lower die and/or with the spray nozzles for the individually determined spray times of the upper die are cool-lubricated and a next workpiece is loaded into the forming machine.

Die individuellen Sprühzeiten können insbesondere basierend auf Maximalwerten des Wärmebildes so bestimmt werden, dass nach dem Kühlschmieren eine gleichmäßige Oberflächentemperatur des Untergesenks und/oder Obergesenks erhalten wird.The individual spraying times can be determined in particular based on maximum values of the thermal image in such a way that a uniform surface temperature of the lower die and/or upper die is obtained after the cooling lubrication.

Bezüglich der mit dem Verfahren einhergehenden Vorteile wird auf die Ausführung zur Kühlvorrichtung und zur Umformmaschine verwiesen.With regard to the advantages associated with the method, reference is made to the description of the cooling device and the forming machine.

Nachfolgend wird die Erfindung anhand von Ausführungsbeispielen näher erläutert. Es zeigt schematisch:
Fig. 1 eine Umformmaschine mit einem SprühkopfThe invention is explained in more detail below using exemplary embodiments. It shows schematically:
1 a forming machine with a spray head

In der Fig. 1 ist eine Umformmaschine mit einem Untergesenk UG und einem Obergesenk OG dargestellt zwischen denen ein Werkstück gepresst werden kann. In den offenen Arbeitsraum AR der Umformmaschine UM ist ein Sprühkopf SK eingefahren. Der Sprühkopf weist mehrere Düsen DU zur Kühlschmierung der Oberfläche des Untergesenks UG und mehrere Düsen DO zur Kühlung des Obergesenks OG auf. Die Düsen UG und OG sind jeweils einzeln ansteuerbar.In the 1 a forming machine with a lower die UG and an upper die OG is shown, between which a workpiece can be pressed. A spray head SK is retracted into the open working space AR of the forming machine UM. The spray head has several nozzles DU for cooling lubrication of the surface of the lower die UG and several nozzles DO for cooling the upper die OG. The nozzles UG and OG can each be controlled individually.

In dem gezeigten Ausführungsbeispiel weist der Sprühkopf SK darüber hinaus zwei Wärmebildkameras KU und KO auf, mit welchen Wärmebilder der Oberfläche des Untergesenks UG bzw. des Obergesenks OG aufgenommen werden können.In the exemplary embodiment shown, the spray head SK also has two thermal imaging cameras KU and KO, with which thermal images of the surface of the lower die UG and the upper die OG can be recorded.

Bei dem in der Fig.1 gezeigten Sprühkopf sind die einzeln ansteuerbaren Düsen DU und DO, Zuführkanäle (nicht dargestellt), über welche ein Kühlfluid oder ein Kühlfluidgemisch den Düsen zugeführt werden kann, und die Aufnahmen für die Wärmebildkameras (KU, KO) als einstückige Baugruppe ausgebildet. Die einstückige Baugruppe wurde dabei mit einem 3D-Druckverfahren hergestellt.At the in the Fig.1 In the spray head shown, the individually controllable nozzles DU and DO, supply channels (not shown) through which a cooling fluid or a cooling fluid mixture can be supplied to the nozzles, and the mounts for the thermal imaging cameras (KU, KO) are designed as a one-piece assembly. The one-piece assembly was produced using a 3D printing process.

Die Kühlvorrichtung weist eine Kontrolleinheit KE auf, mit welcher basierend auf den mittels der Wärmebildkamera KU und der Wärmebildkamera KO individuelle Sprühzeiten für die einzeln ansteuerbaren Düsen DU und DO bestimmt werden können. Auf diese Weise können besonders heiße Stellen des Untergesenks und/oder des Obergesenks länger gekühlt werden als weniger thermisch weniger stark belastete Stellen und somit die Standzeit der Gesenke verlängert werden.The cooling device has a control unit KE, with which individual spraying times for the individually controllable nozzles DU and DO can be determined based on the thermal imaging camera KU and the thermal imaging camera KO. In this way, particularly hot areas of the lower die and/or the upper die can be cooled longer than areas that are subjected to less thermal stress, and the service life of the dies can thus be extended.

Die Kontrolleinheit weist darüber hinaus einen Speicher auf, in welchem die Wärmebilder und/oder die berechneten Sprühzeiten über mehrere Arbeitszyklen der Umformmaschine gespeichert werden können. Dies ermöglicht, Abweichungen frühzeitig zu erkennen und Ausfallzeiten der Umformmaschine zu reduzieren.The control unit also has a memory in which the thermal images and/or the calculated spray times can be stored over a number of working cycles of the forming machine. This enables deviations to be detected early and downtimes of the forming machine to be reduced.

Claims (8)

  1. Cooling device comprising:
    a spray head (SK) for cooling lubrication of a lower die (UG) and/or an upper die (OG) of a forming machine (UM), wherein the spray head (SK) can be introduced between two work strokes into a work space (AR) between the lower die (UG) and the upper die (OG), wherein the spray head (SK) comprises at least two individually activatable nozzles (DU, DO) for cooling lubrication of different places of a die surface of the lower die (UG) and/or the upper die (OG) and a thermal imaging camera (KU, KO) for recording a thermal image of the lower die (UG) and/or the upper die (OG); and
    a control unit (KE) for determining individual spray times of the individually activatable nozzles (DU, DO) in dependence on the thermal image;
    characterised in that
    the control unit (KE) comprises a memory for storing the thermal images over a plurality of work cycles of the forming machine (UM) and is arranged to continuously monitor over several cycles a forming method, which is performable by the forming machine (UM), on the basis of the stored thermal images so that faults can be recognised before the lower die (UG) and/or the upper die (OG) is or are no longer usable.
  2. Cooling device according to claim 1,
    characterised in that
    the individual activatable nozzles (DU, DO) are formed as a one-piece subassembly.
  3. Cooling device according to claim 2,
    characterised in that
    the individually activatable nozzles (DU, DO) and feed channels by way of which a colling fluid or a cooling fluid mixture can be fed to the nozzles (DU, DO) are formed as a one-piece subassembly.
  4. Cooling device according to claim 2,
    characterised in that
    the individually activatable nozzles (DU, DO), feed channels, by way of which a cooling fluid or a cooling fluid mixture can be fed to the nozzles (DU, DO), and a mount for the thermal imaging camera (KU, KO) are formed as a one-piece subassembly.
  5. Cooling device according to any one of claims 2 to 4,
    characterised in that
    the one-piece subassembly is a subassembly produced by means of 3D printing.
  6. Forming machine (UK) comprising a cooling device according to any one of claims 1 to 5, a lower die (UG) and an upper die (OG).
  7. Forming method in which cyclically
    a workpiece is pressed between the lower die (UG) and the upper die (OG) of a forming machine (UM),
    the workpiece is ejected from the forming machine (UM),
    a spray head (SK) with at least two individual activatable nozzles (DU, DO) for cooling lubrication of different places of a die surface of the lower die (UG) and/or the upper die (OG) and with a thermal imaging camera (KU, KO) for recording a thermal image of the lower die (UG) and/or the upper die (OG) is introduced into the work space (AR) between the lower die (UG) and the upper die (OG),
    a thermal image of the lower die (UG) and/or the upper die (OG) is recorded,
    individual spray times of the individually activatable spray nozzles (DU, DO) are determined on the basis on the thermal image,
    places on the die surface of the lower die (UG) and/or the upper die (OG) undergo cooling lubrication by the spray nozzles (DU, DO) for the individually determined spray times and a next workpiece is loaded into the forming machine (UM),
    characterised in that
    thermal images over a plurality of work cycles of the forming machine (UM) are stored and the forming method, which is performable by the forming machine (UM), are monitored continuously over a plurality of work cycles on the basis of the stored thermal images so that faults are recognisable before the lower die (UG) and/or the upper die (OG) is or are no longer usable.
  8. Forming method according to claim 7,
    characterised in that
    the individual spray times are so determined on the basis of maximum values of the thermal image that after the cooling lubrication a uniform surface temperature of the lower die (UG) and/or the upper die (OG) is obtained.
EP20727946.4A 2019-05-16 2020-05-15 Cooling device with a spray head for cooling lubrication of a die of a forming machine and forming process Active EP3969198B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019207163.5A DE102019207163A1 (en) 2019-05-16 2019-05-16 Spray head for cooling a die of a forming machine
PCT/EP2020/063698 WO2020229682A1 (en) 2019-05-16 2020-05-15 Spray head for cooling lubrication of a die of a forming machine

Publications (2)

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EP3969198A1 EP3969198A1 (en) 2022-03-23
EP3969198B1 true EP3969198B1 (en) 2023-01-04

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US (1) US20240024905A1 (en)
EP (1) EP3969198B1 (en)
JP (1) JP2022533131A (en)
DE (1) DE102019207163A1 (en)
WO (1) WO2020229682A1 (en)

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JP2022533131A (en) 2022-07-21
EP3969198A1 (en) 2022-03-23
DE102019207163A1 (en) 2020-11-19
WO2020229682A1 (en) 2020-11-19
US20240024905A1 (en) 2024-01-25

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