EP2210685A1 - Punching tool with a stripping-off device and method for correcting malformations which occur during the punching of sheet metal - Google Patents
Punching tool with a stripping-off device and method for correcting malformations which occur during the punching of sheet metal Download PDFInfo
- Publication number
- EP2210685A1 EP2210685A1 EP09001081A EP09001081A EP2210685A1 EP 2210685 A1 EP2210685 A1 EP 2210685A1 EP 09001081 A EP09001081 A EP 09001081A EP 09001081 A EP09001081 A EP 09001081A EP 2210685 A1 EP2210685 A1 EP 2210685A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- metal plate
- scraper
- region
- punching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004080 punching Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims description 34
- 230000036244 malformation Effects 0.000 title 1
- 230000000295 complement effect Effects 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
- B21D45/006—Stripping-off devices
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
-
- 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
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/06—Stripping-off devices
Definitions
- the invention relates to a method for correcting deformations of sheets during punching on punching machines.
- openings such as round holes are punched out of the sheet metal.
- the sheet is pressed by a punch in a die.
- the contour of the opening in the die corresponds to the contour of the punch.
- the dimension of the opening in the die is circumferentially larger by a few tenths of a millimeter than the dimension of the punch.
- the sheet is pressed into the die at the initial stage of the punching operation, deforming and creating a tensile stress on the upper surface of the sheet.
- the upper portion of a punch is sheared by shearing forces between the punch and the die, and the lower portion then finally breaks due to the reduced load-bearing cross section.
- the initially introduced by the deformation tensile stress is retained in the sheet, so that the entire metal sheet or individual sheet sections, depending on the size and the number of introduced punched, deform. Due to the tensile stress, the outer regions of the metal sheet or the individual sheet metal sections, with the exception of the areas where the sheet is firmly clamped, bent upwards. This leads to inaccuracies in the further processing and a higher tool wear.
- the bent sheet metal is made tension-free by multiple forming of the sheet by an arrangement of several rolls.
- the rollers are arranged offset from each other in a lower row and an upper row. Viewed in the axial direction of the rollers, the lower sector of the surface of the upper rollers is deeper than the upper sector of the surface of the lower rollers. This causes the sheet, as it moves through the rollers, to repeatedly bend in the opposite direction. By this multiple bending of the sheet, the stresses are removed and there is a flat, tension-free sheet metal.
- this processing is complicated because an additional machine and other operations are required. In addition, this processing is not possible for sheets in which conversions were already introduced on the punching machine.
- a punching machine 1 is shown with a tool set according to the invention.
- An integral part of the punching machine 1 is here a C-frame 2.
- the C-frame 2 consists of a torsion-resistant welded steel construction.
- the frame can also be executed in a different form.
- a hydraulic unit 3 is provided, with which a plunger 4 is hydraulically driven via a plunger control 5.
- the punching machine has an axis 6, which is the center axis of a lower tool holder 7 and the plunger 4 with an upper tool holder.
- the lower tool holder 7 is provided on the lower inside of the C-frame 2 for receiving a tool lower part of the tool set.
- the lower tool holder 7 is rotatable about a rotary drive, not shown, and lockable in any angular position.
- the lower tool holder 7 has a drive 8, which moves the lower tool holder 7 along the axis 6. Of the Drive 8 can be controlled so that it stops at any position within its drive path, and then moves forward or backward.
- the plunger 4 is provided on the upper inside of the C-frame 2.
- the plunger 4 with the upper tool holder takes a tool shell 16 of the tool set form-fitting and free of play.
- the plunger 4 is also rotatable and can be detected in any angular position. For a second, not shown rotary drive is available.
- the plunger 4, driven by the plunger control 5 can be stopped at any position within its stroke along the axis 6, and then moved up or down.
- a receptacle, not shown, for a scraper is also provided on the upper inside of the C-frame.
- All actuators such as the rotary actuators, the plunger control 5 and the drive 8 of the lower tool holder 7 are controlled by a machine control device, not shown, which is provided in a separate cabinet. Furthermore, all drives for moving a metal plate 15 and actuators for special functions, such as the folding and folding up a partial flap, not shown, are controlled by the machine control device.
- the control device has as input and output means a keyboard and a monitor. The control functions are performed by microcontrollers. Processing programs and operating parameters are stored in a memory area of the control device.
- a machine table 9 On the lower inside of the C-frame 2, a machine table 9 is arranged, which is a cross rail 10 with a tool magazine 11 has.
- clamping claws 12 are arranged to hold the metal plate 15.
- the clamping claws 12 can be fixed at suitable locations on the cross rail 10, and can be offset so that the metal plate 15 is held securely, but the metal plate 15 is not gripped on a surface to be machined.
- tool holders 13 In the tool magazine 11 more, here three, tool holders 13 for several, here two, tool sets 14 are present.
- the machine table 9 travels in a Y direction together with the cross rail 10, to which the clamps 12 are fixed, with which the plate 15 is held, in a programmed position, and the cross rail 10 moves in the X direction in the programmed position, wherein the plate 15 slides over the machine table 9. Then, a punching stroke is performed by the plunger 4. Following this, the next punching position is approached according to the same principle.
- the tool sets 14 are automatically changed, driven by the machine control device, changed.
- the cross rail 10 driven by a drive, not shown, moves into a position in an X direction so that the X position of the tool set 14 to be loaded corresponds to the X position of the lower tool holder 7 .
- the cross rail 10 then moves together with the machine table 9, driven by a further drive, in a position in the Y direction in which an axis of the tool set 14 with the central axis 6 of the lower tool holder 7 and the plunger 4 matches, so that the Tool set 14 can be added to the lower tool holder 7 and into the tool holder of the plunger 4.
- a scraper belonging to the tool set 14 is thereby transferred to the corresponding receiving device. Unless in the tool holder the plunger 4 and in the lower tool holder 7, a tool is present, this is previously released to a free space in the tool magazine 11.
- Fig. 2 is an inventive tool set 14 shown in the punching machine 1 in installation position shown in a schematic representation.
- the tool set 14 has a tool upper part 16 and a lower tool part 17, and a scraper 18.
- the axis 6 of the tool holders 4, 7 of the punching machine 1 is also the axis 6 of the upper tool part 16, the lower tool part 17 and the scraper 18 in the installed state of the tool set.
- the upper tool part 16 has a punch shaft 19, which is received positively and without play in the plunger 4.
- the punch shaft 19 has a cutting edge 20.
- the contour of the cutting edge 20 determines the shape of the punched-out in the metal plate 15th
- a receptacle 21 for the scraper 18 is provided on the upper inside of the C-frame 2.
- the scraper 18 associated with the tool set 14 is loaded into the receptacle 21 and fastened there.
- the scraper 18 has a shape having at the lower end a disc-shaped portion 24 and along the outer edge of the disc-shaped portion 24 a in Fig. 2 In an approximately vertically upwardly extending edge 22, wherein the wall thickness of the scraper 18 in the region of the edge 22 and a transition region 23 between the edge 22 and the disc-shaped portion 24 is greater than in the disc-shaped portion 24.
- the Scraper 18 here has a recess 27, which allows the blade 20 can pass through the scraper 18.
- the recess 27 can be provided at an off-center blade 20 and outside the range of the axis 6.
- the stiffness of the scraper 18 in the direction of the axis 6 is greater than in the disk-shaped region 24, in which the upper side and the lower side are parallel and have a smaller wall thickness , This favors a deformation of the disk-shaped region 24 of the scraper 18 in relation to the regions 22 and 23.
- the different stiffnesses can also be achieved by other design measures or by a special selection of materials.
- the lower tool part 17 is shown received in the lower tool holder 7.
- the connection between the lower tool holder 7 and the lower tool part 17 is positively and play-free, so that the rotational and axial movements of the lower tool holder 7 are transmitted to the lower tool part 17.
- the tool lower part 17 has a die insert 25 in the center.
- the die insert 25 has in its center an opening 26 whose contour is complementary to the contour of the cutting edge 20.
- the dimensions of the contour of the opening 26 are slightly larger relative to the dimensions of the contour of the cutting edge 20 to form a cutting gap required for a punching operation.
- the cutting gap is usually about 10% of the thickness of the sheet to be machined.
- Circumferentially around the opening 26, a circumferential edge is provided on the upper side of the die insert 25. The peripheral edge is raised above the upper surface of the tool lower part 17.
- the Fig. 2 shows an area of the punching machine with the tool insert 14 before a processing step of a punching operation.
- Fig. 3 shows the end of a processing step in which the cutting edge 20 has just penetrated the metal plate 15.
- the stiffness of the scraper 18 with respect to a movement of the lower surface upwardly in the direction of the axis 6 is greater, so that this area can not be deformed almost upwards.
- the stiffness of the scraper 18 is lower with respect to an upward deformation in the direction of the axis 6, also the deformation of the sheet 15 and the blank holder 18 is caused by the edge of the die insert 25, which is arranged radially in the region 24 of the blank holder 18 , This results in a radially circumferential deformation of the disk-shaped portion 24 of the scraper 18 in its center upwards.
- the metal plate 15 is bent around the generated punching around upwards, wherein the metal plate 15 is supported on the lower surface of the scraper 18 in the areas 22 and 23.
- the Sheet metal plate 15 plastically deformed and the flatness of the metal plate 15 made before the punching process again.
- the lower tool holder 7 does not move simultaneously with the plunger 4.
- the recess is punched into the metal plate 15, and then the sheet is bent up to eliminate the deformation due to the tensile stresses again.
- the sheet can not be pressed against the scraper and thereby deformed, but the sheet can be deformed against a specially designed device.
- the length of the path which the lower tool holder moves axially upward is determined empirically and is dependent on processing parameters, e.g. the sheet thickness, the sheet type, i. the material and the properties of the sheet, and the size and shape of the punched, so the type of tool set used 14, stored in the memory area of the machine control device.
- the punching machine has a device, for example a reflex sensor, for detecting a deformation of the metal plate 15, with which a bending of the sheet is detected at a certain distance from the generated recess due to the tensile stress during the punching process.
- a device for example a reflex sensor, for detecting a deformation of the metal plate 15, with which a bending of the sheet is detected at a certain distance from the generated recess due to the tensile stress during the punching process.
- the lower tool holder 7 is again moved upward, wherein the travel of the lower tool holder 7 is increased.
- the deformation is checked again after this step, and if the result of the check is satisfactory, the changed value of the travel path stored in the machine control device, otherwise the correction is repeated.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Korrektur von Verformungen von Blechen beim Stanzen auf Stanzmaschinen.The invention relates to a method for correcting deformations of sheets during punching on punching machines.
Bei der Bearbeitung von Blechen auf Stanzmaschinen werden Öffnungen wie z.B. runde Löcher aus dem Blech gestanzt. Dabei wird das Blech durch einen Stempel in eine Matrize gedrückt. Die Kontur der Öffnung in der Matrize entspricht der Kontur des Stempels. Die Abmessung der Öffnung in der Matrize ist umlaufend um wenige Zehntelmillimeter größer als die Abmessung des Stempels. Dadurch wird das Blech in der Anfangsphase des Stanzvorgangs in die Matrize gedrückt, wobei es sich verformt und an der oberen Oberfläche des Blechs eine Zugspannung entsteht. Im weiteren Verlauf des Stanzvorgangs wird, über den Querschnitt betrachtet, der obere Bereich einer Ausstanzung durch Scherkräfte zwischen dem Stempel und der Matrize geschnitten bzw. abgeschert, und der untere Bereich bricht dann schließlich auf Grund des verringerten tragenden Querschnitts aus. Die anfänglich durch die Verformung eingebrachte Zugspannung bleibt im Blech erhalten, so dass sich die gesamte Blechtafel oder einzelne Blechabschnitte, abhängig von der Größe und der Anzahl der eingebrachten Stanzungen, verformen. Durch die Zugspannung werden die äußeren Bereiche der Blechtafel oder der einzelnen Blechabschnitte, mit Ausnahme der Bereiche, an denen das Blech fest eingespannt ist, nach oben gebogen. Dies führt zu Ungenauigkeiten bei der weiteren Bearbeitung und einem höheren Werkzeugverschleiß.When processing sheet metal on punching machines, openings such as round holes are punched out of the sheet metal. The sheet is pressed by a punch in a die. The contour of the opening in the die corresponds to the contour of the punch. The dimension of the opening in the die is circumferentially larger by a few tenths of a millimeter than the dimension of the punch. As a result, the sheet is pressed into the die at the initial stage of the punching operation, deforming and creating a tensile stress on the upper surface of the sheet. In the course of the punching operation, as viewed across the cross section, the upper portion of a punch is sheared by shearing forces between the punch and the die, and the lower portion then finally breaks due to the reduced load-bearing cross section. The initially introduced by the deformation tensile stress is retained in the sheet, so that the entire metal sheet or individual sheet sections, depending on the size and the number of introduced punched, deform. Due to the tensile stress, the outer regions of the metal sheet or the individual sheet metal sections, with the exception of the areas where the sheet is firmly clamped, bent upwards. This leads to inaccuracies in the further processing and a higher tool wear.
Durch speziell ballig geschliffene Matrizen und den Einsatz eines aktiven Abstreifers, der das Blech nach unten gegen die Matrize drückt, kann die Situation verbessert werden, wobei jedoch speziell bei langlochartigen Werkzeugen, wo keine Balligkeit an der Matrize möglich ist, die Möglichkeiten beschränkt sind. Außerdem ist ein balliges Schleifen der Matrize nur auf speziellen Rundschleifmaschinen möglich, was die Herstellung aufwendig und kostenintensiv macht.By specially crowned milled dies and the use of an active scraper, which presses the sheet down against the die, the situation can be improved, however, especially in oblong tools where no crowning on the die is possible, the possibilities are limited. In addition, a crowned grinding of the die is possible only on special cylindrical grinding machines, which makes the production expensive and expensive.
Weiterhin besteht die Möglichkeit, die Bleche nach dem Stanzen auf speziellen Richtmaschinen zu bearbeiten, um eine Ebenheit der Bleche wieder herzustellen. In diesen Richtmaschinen wird das gebogene Blech durch mehrfaches Umformen des Blechs durch eine Anordnung von mehreren Walzen spannungsfrei gemacht. Die Walzen sind dafür in einer unteren Reihe und einer oberen Reihe versetzt zueinander angeordnet. In Achsrichtung der Rollen betrachtet, liegt der untere Sektor der Oberfläche der oberen Rollen dabei tiefer als der obere Sektor der Oberfläche der unteren Rollen. Dadurch wird das Blech bei der Bewegung durch die Rollen dazu veranlasst, sich immer wieder in die entgegengesetzte Richtung zu verbiegen. Durch dieses mehrfache Verbiegen des Blechs werden die Spannungen daraus entfernt und es liegt ein ebenes, spannungsfreies Blech vor. Diese Bearbeitung ist jedoch aufwendig, da eine zusätzliche Maschine und weitere Arbeitsgänge erforderlich sind. Außerdem ist diese Bearbeitung nicht bei Blechen möglich, bei denen bereits auf der Stanzmaschine Umformungen eingebracht wurden.Furthermore, it is possible to process the sheets after punching on special straightening machines to restore flatness of the sheets. In these straightening machines, the bent sheet metal is made tension-free by multiple forming of the sheet by an arrangement of several rolls. The rollers are arranged offset from each other in a lower row and an upper row. Viewed in the axial direction of the rollers, the lower sector of the surface of the upper rollers is deeper than the upper sector of the surface of the lower rollers. This causes the sheet, as it moves through the rollers, to repeatedly bend in the opposite direction. By this multiple bending of the sheet, the stresses are removed and there is a flat, tension-free sheet metal. However, this processing is complicated because an additional machine and other operations are required. In addition, this processing is not possible for sheets in which conversions were already introduced on the punching machine.
Es ist Aufgabe der Erfindung, ein Verfahren für eine Stanzmaschine sowie einen Werkzeugsatz hierfür zur Verfügung zu stellen, so dass es möglich wird, eine Verformung eines Blechs beim Stanzen zu korrigieren, um eine ebene Form des Blechs beizubehalten.It is an object of the invention to provide a method for a punching machine and a tool set therefor, so that it becomes possible to correct a deformation of a sheet during punching in order to maintain a flat shape of the sheet.
Die Aufgabe wird durch einen Werkzeugsatz gemäß Anspruch 1 und ein Verfahren gemäß Anspruch 3 gelöst. Weiterentwicklungen der Erfindung sind Gegenstand der abhängigen Ansprüche.
- Fig. 1
- zeigt eine Stanzmaschine mit einem erfindungsgemäßen Werkzeugsatz;
- Fig. 2
- ist eine prinzipielle Darstellung eines Schnitts durch den Werkzeugsatz in einer Stanzmaschine vor einem Stanzhub;
- Fig. 3
- stellt den Schnitt des Werkzeugsatzes aus
Fig. 2 in dem Schritt dar, in dem ein Blech von einem Stempel durchdrungen wird.
- Fig. 1
- shows a punching machine with a tool set according to the invention;
- Fig. 2
- is a schematic representation of a section through the tool set in a punching machine before a punching stroke;
- Fig. 3
- Represents the cut of the tool set
Fig. 2 in the step in which a sheet is penetrated by a stamp.
In
Am hinteren Ende des C-Rahmens 2 ist ein Hydraulikaggregat 3 vorgesehen, mit dem ein Stößel 4 über eine Stößelsteuerung 5 hydraulisch angetrieben wird.At the rear end of the C-
Die Stanzmaschine weist eine Achse 6 auf, welche die Mittelachse einer unteren Werkzeugaufnahme 7 und des Stößels 4 mit einer oberen Werkzeugaufnahme ist. Die untere Werkzeugaufnahme 7 ist auf der unteren Innenseite des C-Rahmens 2 zum Aufnehmen eines Werkzeugunterteils des Werkzeugsatzes vorgesehen. Die untere Werkzeugaufnahme 7 ist über einen nicht gezeigten Drehantrieb drehbar und in jeder beliebigen Winkellage feststellbar. Weiterhin weist die untere Werkzeugaufnahme 7 einen Antrieb 8 auf, der die untere Werkzeugaufnahme 7 entlang der Achse 6 bewegt. Der Antrieb 8 kann so angesteuert werden, dass er innerhalb seines Antriebswegs an jeder beliebigen Position anhält, und dann vor oder zurück fährt.The punching machine has an
Der Stößel 4 ist auf der oberen Innenseite des C-Rahmens 2 vorgesehen. Der Stößel 4 mit der oberen Werkzeugaufnahme nimmt ein Werkzeugoberteil 16 des Werkzeugsatzes formschlüssig und spielfrei auf. Der Stößel 4 ist ebenfalls drehbar und kann in jeder beliebigen Winkellage festgestellt werden. Dafür ist ein zweiter, nicht gezeigter Drehantrieb vorhanden. Auch der Stößel 4 kann, angesteuert durch die Stößelsteuerung 5, an jeder beliebigen Position innerhalb seines Hubwegs entlang der Achse 6 angehalten werden, und dann nach oben oder nach unten weiterbewegt werden. Neben dem Stößel 4 ist an der oberen Innenseite des C-Rahmens ebenfalls eine nicht gezeigte Aufnahmeeinrichtung für einen Abstreifer vorgesehen.The
Sämtliche Aktuatoren, wie z.B. die Drehantriebe, die Stößelsteuerung 5 und der Antrieb 8 der unteren Werkzeugaufnahme 7 werden von einer nicht gezeigten Maschinensteuerungsvorrichtung gesteuert, die in einem separaten Schaltschrank vorgesehen ist. Weiterhin werden auch sämtliche Antriebe zur Bewegung einer Blechplatte 15 und Aktuatoren für Sonderfunktionen, beispielsweise das Ab- und Hochklappen einer nicht gezeigten Teileklappe, durch die Maschinensteuerungsvorrichtung gesteuert. Die Steuerungsvorrichtung weist als Ein- und Ausgabemittel eine Tastatur und einen Monitor auf. Die Steuerungsfunktionen werden von Mikrocontrollern ausgeführt. Bearbeitungsprogramme und Betriebsparameter sind in einem Speicherbereich der Steuerungsvorrichtung abgespeichert.All actuators, such as the rotary actuators, the
Auf der unteren Innenseite des C-Rahmens 2 ist ein Maschinentisch 9 angeordnet, der eine Querschiene 10 mit einem Werkzeugmagazin 11 aufweist. An der Querschiene 10 sind Spannpratzen 12 zum Festhalten der Blechplatte 15 angeordnet. Die Spannpratzen 12 können an geeigneten Stellen auf der Querschiene 10 befestigt werden, und können so versetzt werden, dass die Blechplatte 15 sicher gehalten wird, aber die Blechplatte 15 nicht an einer zu bearbeitenden Fläche gegriffen wird. In dem Werkzeugmagazin 11 sind mehrere, hier drei, Werkzeugaufnahmen 13 für mehrere, hier zwei, Werkzeugsätze 14 vorhanden.On the lower inside of the C-
Im Betrieb fährt der Maschinentisch 9 zum Stanzen in einer Y-Richtung gemeinsam mit der Querschiene 10, an der die Spannpratzen 12 befestigt sind, mit denen das Blech 15 gehalten wird, in eine programmierte Position, und die Querschiene 10 fährt in X-Richtung in die programmierte Position, wobei das Blech 15 über den Maschinentisch 9 gleitet. Dann wird von dem Stößel 4 ein Stanzhub durchgeführt. Im Anschluss daran wird nach dem selben Prinzip die nächste Stanzposition angefahren.In operation, the machine table 9 travels in a Y direction together with the
Die Werkzeugsätze 14 werden automatisch, durch die Maschinensteuerungsvorrichtung angesteuert, gewechselt. Dazu fährt zum Einwechseln der Werkzeugsätze 14 aus dem Werkzeugmagazin 11 die Querschiene 10, angetrieben von einem nicht gezeigten Antrieb, in eine Position in einer X-Richtung, so dass die X-Position des einzuwechselnden Werkzeugsatzes 14 der X-Position der unteren Werkzeugaufnahme 7 entspricht. Die Querschiene 10 fährt dann gemeinsam mit dem Maschinentisch 9, von einem weiteren Antrieb angetrieben, in eine Position in der Y-Richtung, in der eine Achse des Werkzeugsatzes 14 mit der Mittelachse 6 der unteren Werkzeugaufnahme 7 und dem Stößel 4 übereinstimmt, so dass der Werkzeugsatz 14 in die untere Werkzeugaufnahme 7 und in die Werkzeugaufnahme des Stößels 4 aufgenommen werden kann. Ein zu dem Werkzeugsatz 14 gehöriger Abstreifer wird dabei in die entsprechende Aufnahmeeinrichtung übergeben. Sofern in der Werkzeugaufnahme des Stößels 4 und in der unteren Werkzeugaufnahme 7 ein Werkzeug vorhanden ist, wird dieses vorher an einen freien Platz im Werkzeugmagazin 11 abgegeben.The
In
Das Werkzeugoberteil 16 weist einen Stempelschaft 19 auf, der in dem Stößel 4 formschlüssig und spielfrei aufgenommen wird. Am unteren Ende des Stempelschafts 19 weist der Stempelschaft 19 eine Schneide 20 auf. Die Kontur der Schneide 20 bestimmt die Form der Ausstanzung in der Blechplatte 15.The
An der oberen Innenseite des C-Rahmens 2 ist eine Aufnahme 21 für den Abstreifer 18 vorgesehen. Der zu dem Werkzeugsatz 14 zugehörige Abstreifer 18 wird in die Aufnahme 21 eingewechselt und dort befestigt. Der Abstreifer 18 hat eine Form, die am unteren Ende einen scheibenförmigen Bereich 24 aufweist und die entlang des äußeren Rands des scheibenförmigen Bereichs 24 einen sich in
Durch die größere Wandstärke im Bereich des sich nach oben erstreckenden Rands 22 und im Übergangsbereich 23 ist hier die Steifigkeit des Abstreifers 18 in Richtung der Achse 6 größer als im scheibenförmigen Bereich 24, in dem die Oberseite und die Unterseite parallel sind und eine geringere Wandstärke aufweisen. Dies begünstigt eine Verformung des scheibenförmigen Bereichs 24 des Abstreifers 18 gegenüber den Bereichen 22 und 23.Due to the greater wall thickness in the region of the upwardly extending
Die unterschiedlichen Steifigkeiten können auch durch andere konstruktive Maßnahmen oder durch eine spezielle Materialauswahl erzielt werden.The different stiffnesses can also be achieved by other design measures or by a special selection of materials.
Das Werkzeugunterteil 17 ist in der unteren Werkzeugaufnahme 7 aufgenommen dargestellt. Die Verbindung zwischen der unteren Werkzeugaufnahme 7 und dem Werkzeugunterteil 17 ist formschlüssig und spielfrei, so dass die rotatorischen und axialen Bewegungen der unteren Werkzeugaufnahme 7 auf das Werkzeugunterteil 17 übertragen werden. Das Werkzeugunterteil 17 weist im Zentrum einen Matrizeneinsatz 25 auf. Der Matrizeneinsatz 25 weist in seinem Zentrum eine Öffnung 26 auf, deren Kontur komplementär zur Kontur der Schneide 20 ist. Die Abmessungen der Kontur der Öffnung 26 sind zu den Abmessungen der Kontur der Schneide 20 geringfügig größer, um einen Schneidspalt zu bilden, der für eine Stanzbearbeitung erforderlich ist. Der Schneidspalt beträgt üblicherweise ca. 10% der Dicke des zu bearbeitenden Blechs. Umlaufend um die Öffnung 26 ist ein umlaufender Rand auf der Oberseite des Matrizeneinsatzes 25 vorgesehen. Der umlaufende Rand ist über die obere Fläche des Werkzeugunterteils 17 erhaben.The
Die
In einem alternativen Ablauf des Verfahrens verfährt die untere Werkzeugaufnahme 7 nicht gleichzeitig mit dem Stößel 4. Dabei wird erst die Aussparung in die Blechplatte 15 gestanzt, und danach wird das Blech nach oben gebogen, um die Verformung auf Grund der Zugspannungen wieder zu eliminieren.In an alternative sequence of the method, the
Auch kann in einer weiteren Ausführungsform das Blech nicht gegen den Abstreifer gedrückt und dabei verformt werden, sondern das Blech kann gegen eine speziell dafür vorgesehene Einrichtung verformt werden.Also, in a further embodiment, the sheet can not be pressed against the scraper and thereby deformed, but the sheet can be deformed against a specially designed device.
Die Länge des Wegs, den die untere Werkzeugaufnahme axial nach oben verfährt, wird empirisch ermittelt und in Abhängigkeit von Bearbeitungsparametern, z.B. der Blechdicke, der Blechart, d.h. des Materials und der Eigenschaften des Blechs, und der Größe und Form der Ausstanzung, also die Art des verwendeten Werkzeugsatzes 14, im Speicherbereich der Maschinensteuerungsvorrichtung abgespeichert.The length of the path which the lower tool holder moves axially upward is determined empirically and is dependent on processing parameters, e.g. the sheet thickness, the sheet type, i. the material and the properties of the sheet, and the size and shape of the punched, so the type of tool set used 14, stored in the memory area of the machine control device.
In einer alternativen Ausführungsform weist die Stanzmaschine eine Einrichtung, z.B. einen Reflextaster, zum Erfassen einer Verformung der Blechplatte 15 auf, mit der ein Hochbiegen des Blechs in einem bestimmten Abstand von der erzeugten Aussparung auf Grund der Zugspannung beim Stanzvorgang erfasst wird. Bei einem Auftreten einer solchen Verformung wird die untere Werkzeugaufnahme 7 erneut nach oben bewegt, wobei der Verfahrweg der unteren Werkzeugaufnahme 7 vergrößert wird. Die Verformung wird nach diesem Verfahrensschritt erneut überprüft und bei einem befriedigenden Ergebnis der Überprüfung wird der geänderte Wert des Verfahrwegs in der Maschinensteuerungsvorrichtung abgespeichert, ansonsten die Korrektur wiederholt.In an alternative embodiment, the punching machine has a device, for example a reflex sensor, for detecting a deformation of the
Claims (13)
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EP20090001081 EP2210685B1 (en) | 2009-01-27 | 2009-01-27 | Method for correcting deformations occuring during the punching of metal sheets |
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EP20090001081 EP2210685B1 (en) | 2009-01-27 | 2009-01-27 | Method for correcting deformations occuring during the punching of metal sheets |
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EP2210685A1 true EP2210685A1 (en) | 2010-07-28 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110405004A (en) * | 2019-08-26 | 2019-11-05 | 桂林电子科技大学 | A kind of clutch driven plate inner ring apparatus for leveling and flatening method |
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DE29804632U1 (en) * | 1998-03-14 | 1998-05-20 | Opel Adam Ag | Hole press |
US6311594B1 (en) * | 1996-07-03 | 2001-11-06 | Amada Company, Limited | Punch guiding apparatus and stripper plate used therefor |
JP2005028403A (en) * | 2003-07-14 | 2005-02-03 | Amada Co Ltd | Die mounting device in punch press |
EP1621268A1 (en) * | 2003-04-30 | 2006-02-01 | Oiles Corporation | Punch for thin-plate metal and punch device for thin-plate metal with the punch |
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2009
- 2009-01-27 EP EP20090001081 patent/EP2210685B1/en active Active
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US4041817A (en) * | 1976-10-06 | 1977-08-16 | Houdaille Industries, Inc. | Punch holder and stripper combination |
US4261237A (en) * | 1979-03-16 | 1981-04-14 | Houdaille Industries, Inc. | Rigidly supported molded plastics material punch guide and stripper |
US6311594B1 (en) * | 1996-07-03 | 2001-11-06 | Amada Company, Limited | Punch guiding apparatus and stripper plate used therefor |
DE29804632U1 (en) * | 1998-03-14 | 1998-05-20 | Opel Adam Ag | Hole press |
EP1621268A1 (en) * | 2003-04-30 | 2006-02-01 | Oiles Corporation | Punch for thin-plate metal and punch device for thin-plate metal with the punch |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN110405004A (en) * | 2019-08-26 | 2019-11-05 | 桂林电子科技大学 | A kind of clutch driven plate inner ring apparatus for leveling and flatening method |
CN110405004B (en) * | 2019-08-26 | 2024-01-12 | 桂林电子科技大学 | Leveling device and leveling method for inner ring of clutch driven disc |
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