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EP1764194B1 - Punch and method for using such a punch - Google Patents

Punch and method for using such a punch Download PDF

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Publication number
EP1764194B1
EP1764194B1 EP05020381A EP05020381A EP1764194B1 EP 1764194 B1 EP1764194 B1 EP 1764194B1 EP 05020381 A EP05020381 A EP 05020381A EP 05020381 A EP05020381 A EP 05020381A EP 1764194 B1 EP1764194 B1 EP 1764194B1
Authority
EP
European Patent Office
Prior art keywords
punching
knife
knives
sheet
plunger
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.)
Not-in-force
Application number
EP05020381A
Other languages
German (de)
French (fr)
Other versions
EP1764194A1 (en
Inventor
Michael Engel
Stephan Stirnimann
Alex Schuhmacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blumer Maschinenbau AG
Original Assignee
Blumer Maschinenbau AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Blumer Maschinenbau AG filed Critical Blumer Maschinenbau AG
Priority to EP05020381A priority Critical patent/EP1764194B1/en
Priority to DE502005007795T priority patent/DE502005007795D1/en
Priority to AT05020381T priority patent/ATE437731T1/en
Publication of EP1764194A1 publication Critical patent/EP1764194A1/en
Application granted granted Critical
Publication of EP1764194B1 publication Critical patent/EP1764194B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1818—Means for removing cut-out material or waste by pushing out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/002—Precutting and tensioning or breaking

Definitions

  • the present invention relates to a punching device according to the preamble of claim 1 and a method of operating it according to claim 8.
  • a generic punching device and a corresponding operating method are from the EP-B 0 773 856 of the WO 85/01241 and the DE 102 30 365 A1 known.
  • the material sheet to be cut is placed between two wedge-shaped, hollow cylindrical punching blades in the profile. These are mutually movable and arranged so that they can not touch in their final position. This cuts the sheet of material from two sides except for a thin core.
  • the blank is broken out of the sheet of material by means of a punch-like core, which is arranged in one of the knives.
  • Such devices have the advantage that the punching blades do not wear as easily as, for example, the complete punching through the sheet of material. Furthermore, the formation of burrs can be prevented at the edges, which can occur, for example, in the die-Patrizen-cutting.
  • both punching blades penetrate approximately equally deep into the sheet material.
  • EP-B 0 773 856 To provide both knives with stamp-like cores, which are resiliently mounted within the knife ring and can be offset in the punching direction against the knife tips to the rear. At rest, the front surfaces of the stamp lie in the plane of the blade tips, creating a Bending of the bow is prevented. Stop elements limit the maximum stroke of the core relative to the knife and thus determine the maximum cutting depth of the knife. In addition, located on the lower support plate, a stop which cooperates with the upper support plate and determines the minimum distance of the blade tips.
  • the lower knife first cuts into the material. Its cutting depth is limited by the core. In the course of the further downward movement of the upper knife this also cuts into the material, its cutting depth is now limited by the upper core or the stop.
  • the problem here is that although an adaptation of the device to different thicknesses of the material sheet is possible, but not to different hardnesses. For this purpose, an adjustment of the spring constants of the two springs would be necessary in order to still realize a cut on both sides about the same depth. Furthermore, the expressions and the removal of the blank can be realized only with great effort. Since the ejection of the blank takes place in the end position of the knife, the ejecting core must work against the spring force of the other core. Furthermore, the upper support plate for removal of the blank must be lifted so far that the blank can be accessed. Such a relatively large stroke by a multiple of the thickness of the material sheet on the one hand complicates the necessary very precise alignment of the two knives and on the other hand, the realization of high cycle numbers. Another problem is the high wear of the mechanical Components that result from the abrupt braking of the relevant attacks.
  • the invention is therefore based on the object of specifying a punching device and a corresponding punching method in which the removal of the blank is facilitated.
  • two hollow cylindrical punching knives are used.
  • One of the punching knives is stamped.
  • the second punching knife and its associated carrier device have in the punching direction a through opening through which the blank can be ejected by means of the punch.
  • the stamp is used in an advantageous development of the invention for perfecting the cutting edge by its contour is adapted to the contour of the second punching blade, that the blank is not only broken, but the soul is cut through the blank when ejecting the blank over the entire circumference.
  • the sheet is preferably fed so that it can interact with the punching knives largely unhindered and especially before or during punching does not bend.
  • the punching device is designed so that the movement of the sheet in the punching direction in normal operation is not limited by stops, neither directly, for example by stamp as in the EP-B 0 773 856 still indirectly by cooperating with a sheet support attacks.
  • the drive of the punching blade relative to each other is preferably realized so that the punching depth or the stroke of the punching blade can be adjusted without stopping only by means of a suitable control of the drive.
  • the non-impact construction when using knives of the same profile, results in a substantially symmetrical penetration into the sheet of material, even if only one of the knives is driven.
  • Fig. 1 shows an overview punching device according to the invention with a punching tool 44, which is mounted in a frame 40 and a holder.
  • Fig. 2 shows the punching tool 44 in detail.
  • the Figures 3-6 put the operation of the punching device.
  • the core of the punching device is the actual punching tool 44, which in Fig. 1 and 2 each comprises three pairs of knives, which consist of an upper first punching knife 10 and a lower second punching knife 12. In Fig. 3-6 For the sake of simplicity, only one pair of blades is shown.
  • First and second punching blades 10, 12 are rigidly connected to a respective carrier device 20, 22, of which in Fig. 3-6 only the lower support device 22 is shown.
  • the carrier device 22 comprises a blade receiving plate 22 '; the upper support device 20 may be designed analogously.
  • the carrier device 22 is fixedly connected to the frame 40, while the first punching blade 10 and its carrier device 20 can be moved by means of a suitable drive 36 in the punching direction S and thereby executes a stroke H.
  • the drive is an electrically controllable, pneumatically or hydraulically operating lifting device whose stroke H can be adjusted by means of a control device 42 and in small steps, for example in 0.02 mm steps, can be changed.
  • the stroke H is preferably between about 4 and 6 mm.
  • the vertically oriented precision rolling guides 32 connected to the carrier devices 20, 22 serve to realize the precise vertical movement of the punching blades 10, 12. With adjusting means, not shown, the relative position of the punching blades 10, 12 is set in the horizontal direction.
  • Vertically oriented compression springs 34 arranged between the carrier devices 20, 22 serve to stabilize the carrier devices 20, 22 and upward movement of the upper support device 20 during punching.
  • the punching blades 10, 12 are hollow cylindrical and have a wedge-shaped in section in the punching direction S cutting edge 11, 13.
  • the punching blades 10, 12 are opposite to each other in the here vertically extending punching direction S.
  • the area enclosed by the knife edges 11, 13 has approximately the same shape for both punching blades 10, 12.
  • a flat sheet support 18 is connected to the lower support device 22 via springs 26 (see Fig. 3-6 ).
  • the support surface 19 of the sheet support 18 is located in Fig. 3 illustrated resting state above the cutting edge 13 of the lower punching blade 12, for example, 0.5-1 mm apart to the sheet of material 16 to be able to introduce nondestructive between the two punching blades 10, 12.
  • a punch 14 is disposed within the upper punch blade 10, which can be with a further drive 38 in the vertical direction, ie in the punching direction S, can be moved.
  • the front surface 15 of the punch 14 is offset at rest relative to the cutting edges 11 of the upper punch blade 10 by an amount D of about 1 mm.
  • the lower punching blade 12, the knife-receiving plate 22 'and the support device 22 are hollow and enclose a channel-like, in the punching direction S opening 24 through which the blank 30 can be pushed down.
  • the lower punching knife 12 contains no stamp.
  • the sheet support 18 is provided with a recess 25 which is aligned in the punching direction S with the opening 24 and larger than this.
  • the punching device works as follows: As in Fig. 1 shown, a sheet of material 16 is introduced on the sheet support 18 between the punching blades 10, 12.
  • the sheet support 18 is held by the springs 26, of which a total of preferably four, at a distance from the blade receiving plate 22 '.
  • the punch 14 is located in a relation to the cutting 11 of the upper punch blade 10 retracted position.
  • a control pulse of the control device 42 actuates the drive 36 and causes the upper support device 20 to move downwards by a stroke H.
  • Fig. 4 the lowered position of the upper punch blade 10 is shown in solid lines and the rest position according to Fig. 3 indicated by dashed lines.
  • the punch 14 is still coupled to the upper support device 20 and therefore also moved downwards. Due to the pressure of the upper punching blade 10 on the material sheet 16, the upper punching blade 10 cuts into the sheet of material 16.
  • the spring constant of the sheet support 18 supporting springs 26 is chosen so small that the force necessary for pressing down the sheet support 18 by a multiple is lower than the force exerted by the upper punch blade 10, preferably by a factor of 100-500.
  • the force required to push down the sheet support 18 by typically 2-3 mm is approximately between 50 and 150 N.
  • the sheet support 18 offers virtually no resistance.
  • the movement of the Sheet support 18 down not limited by stops, in particular between the lower support device 22 and the blade receiving plate 22 'and the sheet support 18, a gap 48.
  • the recess 25 in the sheet support 18 is so large that the sheet support 18 when pressed down with the Punching knife 12 or the blade receiving plate 22 'comes into contact or even jammed.
  • the stroke H with the control device 42 is selected so that both punching blades 10, 12 penetrate into a depth T1 or T2, T1 being approximately equal to T2, and a core 28 having a thickness d of approximately 0.05 to 0, 15 mm, preferably about 0.1 mm between the knife edges 11, 13 remains. Furthermore, the front surface 15 of the punch 14 relative to the cutting edge 11 of the upper punch blade 10 by an amount D> T1 offset to the rear, so that they during the punching process from the material sheet 16th is spaced and does not act as a stop.
  • Fig. 5 shows how the blank 30 is pressed out of the material sheet 16 by means of the punch 14.
  • the control device 42 causes the further drive 38 to move the punch 14 relative to the upper punching knife 10.
  • the stroke of the punch 14 relative to the punching knife 10 is preferably 10 to 20 mm for this purpose.
  • An unillustrated lifting cylinder with fixed end positions serves to realize the movement of the punch.
  • the outer edges 14 'of the punch 14 cooperate in the manner of a pair of scissors with the knife edge 13 of the lower punch blade 12 by the contour of the punch 14 is adapted to that of the punching blade 12, so that the soul 28 is severed clean.
  • the blank 30 falls down through the opening 24 and can be removed there or removed with a suitable transport means 46.
  • the upper support device 20 and the punch 14 are again in their in Fig. 3 brought shown rest position, so that the spring 26 relaxed and the support surface 19 of the sheet support 18 is again arranged above the knife edge 13.
  • an eccentric drive can also be used, with which a stop-free movement of the punching blade with a predetermined stroke can likewise be realized.
  • the drive 38 for the punch 14 can also be integrated in the drive 36 for the upper punching blade 10 and the upper support device 20.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Making Paper Articles (AREA)

Abstract

The stamp assembly for stamping blanks (30) from a cardboard sheet has two hollow cylindrical stamping cutters (10,12) which are spaced to define a bore (28) in the blank sheet (16). There is a punch (14) movable relative to the first stamping cutter to push the stamped blank out of an aperture in the second stamping cutter and its support. Claims include a method of operation of the stamping press.

Description

Die vorliegende Erfindung betrifft eine Stanzvorrichtung gemäss dem Oberbegriff von Anspruch 1 und ein Verfahren zum Betrieb davon gemäss Anspruch 8.The present invention relates to a punching device according to the preamble of claim 1 and a method of operating it according to claim 8.

Eine gattungsgemässe Stanzvorrichtung und ein entsprechendes Betriebsverfahren sind aus der EP-B 0 773 856 der WO 85/01241 und der DE 102 30 365 A1 bekannt. Dabei wird der zu schneidende Materialbogen zwischen zwei im Profil keilförmige, hohlzylindrische Stanzmesser gebracht. Diese sind gegeneinander beweglich und so angeordnet, dass sie sich in ihrer Endposition nicht berühren können. Damit wird der Materialbogen mit Ausnahme einer dünnen Seele von zwei Seiten geschnitten. Der Zuschnitt wird mittels eines stempelartigen Kerns, der in einem der Messer angeordnet ist, aus dem Materialbogen herausgebrochen. Derartige Vorrichtungen haben den Vorteil, dass sich die Stanzmesser nicht so leicht abnutzen wie beispielsweise beim vollständigen Durchstanzen durch den Materialbogen. Des weiteren kann die Bildung von Graten an den Kanten verhindert werden, welche beispielsweise beim Matrizen-Patrizen-Schneiden auftreten können.A generic punching device and a corresponding operating method are from the EP-B 0 773 856 of the WO 85/01241 and the DE 102 30 365 A1 known. The material sheet to be cut is placed between two wedge-shaped, hollow cylindrical punching blades in the profile. These are mutually movable and arranged so that they can not touch in their final position. This cuts the sheet of material from two sides except for a thin core. The blank is broken out of the sheet of material by means of a punch-like core, which is arranged in one of the knives. Such devices have the advantage that the punching blades do not wear as easily as, for example, the complete punching through the sheet of material. Furthermore, the formation of burrs can be prevented at the edges, which can occur, for example, in the die-Patrizen-cutting.

Idealerweise dringen beide Stanzmesser etwa gleich tief in das Bogenmaterial ein. Um die Schneidtiefe einzustellen, insbesondere zur Anpassung an unterschiedliche Bogendicken, schlägt die EP-B 0 773 856 vor, beide Messer mit stempelartigen Kernen zu versehen, die sich federnd gelagert innerhalb des Messerkranzes befinden und in Stanzrichtung gegen die Messerspitzen nach hinten versetzt werden können. Im Ruhezustand liegen die Frontflächen der Stempel in der Ebene der Messerspitzen, wodurch ein Durchbiegen des Bogens verhindert wird. Anschlagelemente begrenzen den maximalen Hub des Kerns relativ zum Messer und bestimmen damit die maximale Schneidtiefe des Messers. Zudem befindet sich an der unteren Trägerplatte ein Anschlag, der mit der oberen Trägerplatte zusammenwirkt und die minimale Distanz der Messerspitzen bestimmt. Durch geeignete Wahl der Federkonstanten der Lagerung der Kerne soll es gelingen, dass beim Herunterfahren des oberen Messers zuerst das untere Messer in das Material einschneidet. Dessen Schneidtiefe wird durch den Kern begrenzt. Im Verlauf der weiteren Abwärtsbewegung des oberen Messers schneidet auch dieses in das Material ein, wobei seine Schneidtiefe nunmehr durch den oberen Kern oder den Anschlag begrenzt wird.Ideally, both punching blades penetrate approximately equally deep into the sheet material. To adjust the depth of cut, especially for adaptation to different sheet thicknesses, suggests the EP-B 0 773 856 To provide both knives with stamp-like cores, which are resiliently mounted within the knife ring and can be offset in the punching direction against the knife tips to the rear. At rest, the front surfaces of the stamp lie in the plane of the blade tips, creating a Bending of the bow is prevented. Stop elements limit the maximum stroke of the core relative to the knife and thus determine the maximum cutting depth of the knife. In addition, located on the lower support plate, a stop which cooperates with the upper support plate and determines the minimum distance of the blade tips. By a suitable choice of the spring constants of the storage of the cores, it should be possible that, when the upper knife is lowered, the lower knife first cuts into the material. Its cutting depth is limited by the core. In the course of the further downward movement of the upper knife this also cuts into the material, its cutting depth is now limited by the upper core or the stop.

Problematisch hierbei ist, dass zwar eine Anpassung der Vorrichtung an verschiedene Dicken des Materialbogens möglich ist, nicht aber an verschiedene Härten. Denn hierzu wäre auch eine Anpassung der Federkonstanten der beiden Federn notwendig, um nach wie vor einen beidseitig etwa gleich tiefen Schnitt zu realisieren. Des weiteren ist das Ausdrücken und die Entnahme des Zuschnitts nur unter grossem Aufwand zu realisieren. Da das Ausstossen des Zuschnitts in der Endposition der Messer stattfindet, muss der herausdrückende Kern gegen die Federkraft des anderen Kerns arbeiten. Des weiteren muss die obere Trägerplatte zur Entnahme des Zuschnitts so weit abgehoben werden, dass auf den Zuschnitt zugegriffen werden kann. Ein solcher verhältnismässig grosser Hub um ein Vielfaches der Dicke des Materialbogens erschwert einerseits die notwendige sehr präzise Ausrichtung der beiden Messer und andererseits die Realisierung hoher Taktzahlen. Ein weiteres Problem ist der hohe Verschleiss der mechanischen Komponenten, der durch das stossartige Abbremsen an den betreffenden Anschlägen entsteht.The problem here is that although an adaptation of the device to different thicknesses of the material sheet is possible, but not to different hardnesses. For this purpose, an adjustment of the spring constants of the two springs would be necessary in order to still realize a cut on both sides about the same depth. Furthermore, the expressions and the removal of the blank can be realized only with great effort. Since the ejection of the blank takes place in the end position of the knife, the ejecting core must work against the spring force of the other core. Furthermore, the upper support plate for removal of the blank must be lifted so far that the blank can be accessed. Such a relatively large stroke by a multiple of the thickness of the material sheet on the one hand complicates the necessary very precise alignment of the two knives and on the other hand, the realization of high cycle numbers. Another problem is the high wear of the mechanical Components that result from the abrupt braking of the relevant attacks.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Stanzvorrichtung und ein entsprechendes Stanzverfahren anzugeben, bei welchem die Entnahme des Zuschnitts erleichtert ist.The invention is therefore based on the object of specifying a punching device and a corresponding punching method in which the removal of the blank is facilitated.

Die Aufgabe wird gelöst durch eine Stanzvorrichtung mit den Merkmalen von Anspruch 1 und ein Verfahren zum Betrieb einer solchen Stanzvorrichtung mit den Merkmalen von Anspruch 8. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen, der Beschreibung und den Zeichnungen angegeben.The object is achieved by a punching device having the features of claim 1 and a method of operating such a punching device having the features of claim 8. Advantageous developments of the invention are specified in the dependent claims, the description and the drawings.

Erfindungsgemäss werden zwei hohlzylindrische Stanzmesser verwendet. Eines der Stanzmesser ist mit einem Stempel versehen. Das zweite Stanzmesser und die ihm zugeordnete Trägervorrichtung weisen in Stanzrichtung eine durchgehende Öffnung auf, durch die der Zuschnitt mittels des Stempels ausgestossen werden kann. Auf diese Weise gelingt ein effizientes Abführen der Zuschnitte, ohne dass die Messer mehr als den zum Einschieben und Stanzen des Bogens notwendigen Relativhub ausführen müssen. Der Stempel dient in einer vorteilhaften Weiterbildung der Erfindung zur Perfektionierung der Schnittkante, indem sein Umriss derart an die Kontur des zweiten Stanzmessers angepasst ist, dass der Zuschnitt nicht nur ausgebrochen, sondern die Seele beim Ausstossen des Zuschnitts über den gesamten Umfang durchgeschnitten wird.According to the invention, two hollow cylindrical punching knives are used. One of the punching knives is stamped. The second punching knife and its associated carrier device have in the punching direction a through opening through which the blank can be ejected by means of the punch. In this way, it is possible to efficiently discharge the blanks without the need for the knives to perform more than the relative stroke necessary for the insertion and punching of the sheet. The stamp is used in an advantageous development of the invention for perfecting the cutting edge by its contour is adapted to the contour of the second punching blade, that the blank is not only broken, but the soul is cut through the blank when ejecting the blank over the entire circumference.

Bei der erfindungsgemässen offenen Gestaltung des zweiten Stanzmessers und seiner Trägervorrichtung wird der Bogen vorzugsweise so zugeführt, dass er weitgehend ungehindert mit den Stanzmessern zusammenwirken kann und sich insbesondere vor oder während des Stanzens nicht durchbiegt. Erfindungsgemäß ist die Stanzvorrichtung dazu so gestaltet, dass die Bewegung des Bogens in Stanzrichtung im Normalbetrieb nicht durch Anschläge begrenzt wird, und zwar weder direkt z.B. durch Stempel wie bei der EP-B 0 773 856 noch indirekt durch mit einer Bogenauflage zusammenwirkende Anschläge. Auch der Antrieb der Stanzmesser relativ zueinander wird vorzugsweise so realisiert, dass die Stanztiefe bzw. der Hub der Stanzmesser anschlagfrei nur mittels einer geeigneten Ansteuerung des Antriebs eingestellt werden kann. Die anschlagfreie Konstruktion führt bei Verwendung von Messern mit gleichem Profil zu einem weitgehend symmetrischen Eindringen in den Materialbogen, auch wenn nur eines der Messer angetrieben ist.In the open design according to the invention of the second punching knife and its carrier device, the sheet is preferably fed so that it can interact with the punching knives largely unhindered and especially before or during punching does not bend. According to the punching device is designed so that the movement of the sheet in the punching direction in normal operation is not limited by stops, neither directly, for example by stamp as in the EP-B 0 773 856 still indirectly by cooperating with a sheet support attacks. Also, the drive of the punching blade relative to each other is preferably realized so that the punching depth or the stroke of the punching blade can be adjusted without stopping only by means of a suitable control of the drive. The non-impact construction, when using knives of the same profile, results in a substantially symmetrical penetration into the sheet of material, even if only one of the knives is driven.

Beispiele für die Erfindung sind in den Zeichnungen dargestellt und nachfolgend beschrieben. Es zeigen rein schematisch:

Fig. 1
eine Überblickszeichnung einer erfindungsgemässen Stanzvorrichtung;
Fig. 2
eine Detailansicht des Stanzwerkzeugs der Stanzvorrichtung aus Fig. 1;
Fig. 3-6
Detailansichten einer erfindungsgemässen Stanzvorrichtung in verschiedenen Stadien eines Stanzzyklus.
Examples of the invention are illustrated in the drawings and described below. It shows purely schematically:
Fig. 1
an outline drawing of an inventive punching device;
Fig. 2
a detailed view of the punch of the punching device Fig. 1 ;
Fig. 3-6
Detailed views of a punching device according to the invention in various stages of a punching cycle.

Fig. 1 zeigt im Überblick eine erfindungsgemässe Stanzvorrichtung mit einem Stanzwerkzeug 44, das in einem Rahmen 40 bzw. einer Halterung gehaltert ist. Fig. 2 zeigt das Stanzwerkzeug 44 im Detail. Die Figuren 3-6 stellen die Funktionsweise der Stanzvorrichtung dar. Fig. 1 shows an overview punching device according to the invention with a punching tool 44, which is mounted in a frame 40 and a holder. Fig. 2 shows the punching tool 44 in detail. The Figures 3-6 put the operation of the punching device.

Kernstück der Stanzvorrichtung ist das eigentliche Stanzwerkzeug 44, das in Fig. 1 und 2 jeweils drei Messerpaare umfasst, die aus einem oberen ersten Stanzmesser 10 und einem unteren zweiten Stanzmesser 12 bestehen. In Fig. 3-6 ist der Einfachheit halber nur ein Messerpaar dargestellt.The core of the punching device is the actual punching tool 44, which in Fig. 1 and 2 each comprises three pairs of knives, which consist of an upper first punching knife 10 and a lower second punching knife 12. In Fig. 3-6 For the sake of simplicity, only one pair of blades is shown.

Erstes und zweites Stanzmesser 10, 12 sind mit jeweils einer Trägervorrichtung 20, 22 starr verbunden, von denen in Fig. 3-6 nur die untere Trägervorrichtung 22 gezeigt ist. Wie in Fig. 3-6 angedeutet, umfasst die Trägervorrichtung 22 eine Messeraufnahmeplatte 22'; die obere Trägervorrichtung 20 kann analog gestaltet sein. Die Trägervorrichtung 22 ist ortsfest mit dem Rahmen 40 verbunden, während das erste Stanzmesser 10 bzw. seine Trägervorrichtung 20 mittels eines geeigneten Antriebs 36 in Stanzrichtung S bewegt werden kann und dabei einen Hub H ausführt. Bevorzugt ist der Antrieb eine elektrisch ansteuerbare, pneumatisch oder hydraulisch arbeitende Hubvorrichtung, deren Hub H mittels einer Steuervorrichtung 42 eingestellt und in kleinen Schritten, z.B. in 0,02 mm Schritten, verändert werden kann. Der Hub H beträgt vorzugsweise etwa zwischen 4 und 6 mm.First and second punching blades 10, 12 are rigidly connected to a respective carrier device 20, 22, of which in Fig. 3-6 only the lower support device 22 is shown. As in Fig. 3-6 indicated, the carrier device 22 comprises a blade receiving plate 22 '; the upper support device 20 may be designed analogously. The carrier device 22 is fixedly connected to the frame 40, while the first punching blade 10 and its carrier device 20 can be moved by means of a suitable drive 36 in the punching direction S and thereby executes a stroke H. Preferably, the drive is an electrically controllable, pneumatically or hydraulically operating lifting device whose stroke H can be adjusted by means of a control device 42 and in small steps, for example in 0.02 mm steps, can be changed. The stroke H is preferably between about 4 and 6 mm.

Mit den Trägervorrichtungen 20, 22 verbundene, vertikal orientierte Präzisions-Wälzführungen 32 dienen dazu, die präzise Vertikalbewegung der Stanzmesser 10, 12 zu realisieren. Mit nicht dargestellten Verstellmitteln wird die relative Lage der Stanzmesser 10, 12 in horizontaler Richtung eingestellt. Vertikal orientierte, zwischen den Trägervorrichtungen 20, 22 angeordnete Druckfedern 34 dienen zur Stabilisierung der Trägervorrichtungen 20, 22 und Aufwärtsbewegung der oberen Trägervorrichtung 20 beim bzw. nach dem Stanzen.The vertically oriented precision rolling guides 32 connected to the carrier devices 20, 22 serve to realize the precise vertical movement of the punching blades 10, 12. With adjusting means, not shown, the relative position of the punching blades 10, 12 is set in the horizontal direction. Vertically oriented compression springs 34 arranged between the carrier devices 20, 22 serve to stabilize the carrier devices 20, 22 and upward movement of the upper support device 20 during punching.

Die Stanzmesser 10, 12 sind hohlzylindrisch und haben eine im Schnitt in Stanzrichtung S keilförmige Schneide 11, 13. Die Stanzmesser 10, 12 liegen einander in der hier vertikal verlaufenden Stanzrichtung S gegenüber. Der von den Messerschneiden 11, 13 umschlossene Bereich hat für beide Stanzmesser 10, 12 etwa die gleiche Form.The punching blades 10, 12 are hollow cylindrical and have a wedge-shaped in section in the punching direction S cutting edge 11, 13. The punching blades 10, 12 are opposite to each other in the here vertically extending punching direction S. The area enclosed by the knife edges 11, 13 has approximately the same shape for both punching blades 10, 12.

Eine flächige Bogenauflage 18 ist mit der unteren Trägervorrichtung 22 über Federn 26 verbunden (siehe Fig. 3-6). Die Auflagefläche 19 der Bogenauflage 18 liegt im in Fig. 3 dargestellten Ruhezustand oberhalb der Schneide 13 des unteren Stanzmessers 12, z.B. 0,5-1 mm beabstandet, um den Materialbogen 16 zerstörungsfrei zwischen die beiden Stanzmesser 10, 12 einführen zu können.A flat sheet support 18 is connected to the lower support device 22 via springs 26 (see Fig. 3-6 ). The support surface 19 of the sheet support 18 is located in Fig. 3 illustrated resting state above the cutting edge 13 of the lower punching blade 12, for example, 0.5-1 mm apart to the sheet of material 16 to be able to introduce nondestructive between the two punching blades 10, 12.

Wie in Fig. 3-6 schematisch dargestellt, ist innerhalb des oberen Stanzmessers 10 ein Stempel 14 angeordnet, der mit einem weiteren Antrieb 38 in vertikaler Richtung, d.h. in Stanzrichtung S, bewegt werden kann. Die Frontfläche 15 des Stempels 14 ist im Ruhezustand gegenüber den Schneiden 11 des oberen Stanzmessers 10 um einen Betrag D von ca. 1 mm nach oben versetzt.As in Fig. 3-6 shown schematically, a punch 14 is disposed within the upper punch blade 10, which can be with a further drive 38 in the vertical direction, ie in the punching direction S, can be moved. The front surface 15 of the punch 14 is offset at rest relative to the cutting edges 11 of the upper punch blade 10 by an amount D of about 1 mm.

Erfindungsgemäss sind das untere Stanzmesser 12, die Messeraufnahmeplatte 22' und die Trägervorrichtung 22 hohl und umschliessen eine kanalartige, in Stanzrichtung S verlaufende Öffnung 24, durch die der Zuschnitt 30 nach unten gestossen werden kann. Im Gegensatz zum Stand der Technik enthält das untere Stanzmesser 12 keinen Stempel. Des weiteren ist auch die Bogenauflage 18 mit einer Aussparung 25 versehen, die in Stanzrichtung S mit der Öffnung 24 fluchtet bzw. grösser als diese ist.According to the invention, the lower punching blade 12, the knife-receiving plate 22 'and the support device 22 are hollow and enclose a channel-like, in the punching direction S opening 24 through which the blank 30 can be pushed down. In contrast to the prior art, the lower punching knife 12 contains no stamp. Furthermore, the sheet support 18 is provided with a recess 25 which is aligned in the punching direction S with the opening 24 and larger than this.

Unterhalb der unteren Trägervorrichtung 22 befindet sich eine Transportvorrichtung 46 für Zuschnitte 30, die in Fig. 6 angedeutet ist.Below the lower carrier device 22 is a transport device 46 for blanks 30, which in Fig. 6 is indicated.

Die Stanzvorrichtung funktioniert wie folgt: Wie in Fig. 1 gezeigt, wird ein Materialbogen 16 auf der Bogenauflage 18 zwischen die Stanzmesser 10, 12 eingeführt. Die Bogenauflage 18 wird durch die Federn 26, von denen insgesamt vorzugsweise vier vorhanden sind, in einem Abstand von der Messeraufnahmeplatte 22' gehalten. Der Stempel 14 befindet sich in einer gegenüber den Schneiden 11 des oberen Stanzmessers 10 zurückgezogenen Position.The punching device works as follows: As in Fig. 1 shown, a sheet of material 16 is introduced on the sheet support 18 between the punching blades 10, 12. The sheet support 18 is held by the springs 26, of which a total of preferably four, at a distance from the blade receiving plate 22 '. The punch 14 is located in a relation to the cutting 11 of the upper punch blade 10 retracted position.

Ein Steuerimpuls der Steuervorrichtung 42 setzt den Antrieb 36 in Gang und veranlasst die obere Trägervorrichtung 20, sich um einen Hub H nach unten zu verschieben. In Fig. 4 ist die abgesenkte Stellung des oberen Stanzmessers 10 in durchgezogenen Linien dargestellt und die Ruheposition gemäss Fig. 3 gestrichelt angedeutet. Der Stempel 14 ist noch mit der oberen Trägervorrichtung 20 gekoppelt und wird daher ebenfalls nach unten bewegt. Durch den Druck des oberen Stanzmessers 10 auf den Materialbogen 16 schneidet das obere Stanzmesser 10 in den Materialbogen 16 ein. Die Federkonstante der die Bogenauflage 18 stützenden Federn 26 ist so gering gewählt, dass die zum Hinunterdrücken der Bogenauflage 18 notwendige Kraft um ein Vielfaches geringer ist als die durch das obere Stanzmesser 10 ausgeübte Kraft, vorzugsweise um einen Faktor 100-500. Bei einer typischen Stanzkraft von 25 kN beträgt die zum Herunterdrücken der Bogenauflage 18 um typischerweise 2-3 mm notwendige Kraft beispielsweise etwa zwischen 50 und 150 N. Damit bietet die Bogenauflage 18 praktisch keinen Widerstand. Des weiteren wird die Bewegung der Bogenauflage 18 nach unten nicht durch Anschläge begrenzt, insbesondere bleibt zwischen der unteren Trägervorrichtung 22 bzw. der Messeraufnahmeplatte 22' und der Bogenauflage 18 ein Spalt 48. Die Aussparung 25 in der Bogenauflage 18 ist so gross, dass die Bogenauflage 18 beim Herunterdrücken nicht mit dem Stanzmesser 12 oder der Messeraufnahmeplatte 22' in Berührung kommt oder sogar verklemmt. Diese anschlagfreie Gestaltung und die geringe Federkonstante führen dazu, dass die Bogenauflage 18 unmittelbar nachgibt und beide Stanzmesser 10, 12 bei einem homogenen Material oder im Schnitt symmetrisch aufgebauten Verbundmaterial durch den Stoss des oberen Stanzmessers 10 etwa gleich tief in den Materialbogen 16 hineingestossen werden. Eine Anpassung der Eindringtiefen T1, T2 durch Anschläge oder im Messer angeordnete Stempel wie beim Stand der Technik ist nicht notwendig. Diese Konstruktion verhindert trotz der offenen Gestaltung des unteren Stanzmessers 12 und der Bogenauflage 18 mit Aussparung 25 ein Durchbiegen und damit unpräzises Schneiden des Materialbogens 16, da zu einem sehr frühen Zeitpunkt im Stanzvorgang bereits die Schneiden 11, 13 beider Stanzmesser 10, 12 eindringen und von der Bogenauflage kein Widerstand ausgeübt wird.A control pulse of the control device 42 actuates the drive 36 and causes the upper support device 20 to move downwards by a stroke H. In Fig. 4 the lowered position of the upper punch blade 10 is shown in solid lines and the rest position according to Fig. 3 indicated by dashed lines. The punch 14 is still coupled to the upper support device 20 and therefore also moved downwards. Due to the pressure of the upper punching blade 10 on the material sheet 16, the upper punching blade 10 cuts into the sheet of material 16. The spring constant of the sheet support 18 supporting springs 26 is chosen so small that the force necessary for pressing down the sheet support 18 by a multiple is lower than the force exerted by the upper punch blade 10, preferably by a factor of 100-500. For example, with a typical punching force of 25 kN, the force required to push down the sheet support 18 by typically 2-3 mm is approximately between 50 and 150 N. Thus, the sheet support 18 offers virtually no resistance. Furthermore, the movement of the Sheet support 18 down not limited by stops, in particular between the lower support device 22 and the blade receiving plate 22 'and the sheet support 18, a gap 48. The recess 25 in the sheet support 18 is so large that the sheet support 18 when pressed down with the Punching knife 12 or the blade receiving plate 22 'comes into contact or even jammed. This stop-free design and the low spring constant cause the sheet support 18 yields immediately and both punching blades 10, 12 in a homogeneous material or in section symmetrically constructed composite material by the impact of the upper punch blade 10 are approximately equally deep pushed into the sheet 16. An adaptation of the penetration depths T1, T2 by stops or in the knife arranged punch as in the prior art is not necessary. This construction prevents despite the open design of the lower punch blade 12 and the sheet support 18 with recess 25 bending and thus imprecise cutting of the material sheet 16, since at a very early date in the punching process already the cutting edges 11, 13 of both punching blades 10, 12 penetrate and the sheet pad no resistance is exercised.

Erfindungsgemäss ist der Hub H mit der Steuervorrichtung 42 so gewählt, dass beide Stanzmesser 10, 12 in eine Tiefe T1 bzw. T2, wobei T1 ungefähr gleich T2 ist, eindringen und eine Seele 28 einer Dicke d von ca. 0,05 bis 0,15 mm, vorzugsweise ca. 0,1 mm zwischen den Messerschneiden 11, 13 verbleibt. Des weiteren ist die Frontfläche 15 des Stempels 14 gegenüber der Schneide 11 des oberen Stanzmessers 10 um einen Betrag D>T1 nach hinten versetzt, so dass sie während des Stanzvorgangs vom Materialbogen 16 beabstandet ist und nicht als Anschlag wirkt.According to the invention, the stroke H with the control device 42 is selected so that both punching blades 10, 12 penetrate into a depth T1 or T2, T1 being approximately equal to T2, and a core 28 having a thickness d of approximately 0.05 to 0, 15 mm, preferably about 0.1 mm between the knife edges 11, 13 remains. Furthermore, the front surface 15 of the punch 14 relative to the cutting edge 11 of the upper punch blade 10 by an amount D> T1 offset to the rear, so that they during the punching process from the material sheet 16th is spaced and does not act as a stop.

Fig. 5 zeigt, wie der Zuschnitt 30 mittels des Stempels 14 aus dem Materialbogen 16 herausgedrückt wird. Die Steuervorrichtung 42 veranlasst dazu den weiteren Antrieb 38 zu einer Bewegung des Stempels 14 relativ zum oberen Stanzmesser 10. Der Hub des Stempels 14 relativ zum Stanzmesser 10 beträgt dazu vorzugsweise 10 bis 20 mm. Ein nicht dargestellter Hubzylinder mit festen Endpositionen dient zur Realisierung der Bewegung des Stempels. Vorzugsweise wirken die Aussenkanten 14' des Stempels 14 dazu nach Art einer Schere mit der Messerschneide 13 des unteren Stanzmessers 12 zusammen, indem die Kontur des Stempels 14 an die des Stanzmessers 12 angepasst ist, so dass die Seele 28 sauber durchtrennt wird. Wie in Fig. 6 gezeigt, fällt der Zuschnitt 30 durch die Öffnung 24 nach unten und kann mit dort entnommen oder mit einer geeigneten Transporteinrichtung 46 entfernt werden. Anschliessend werden die obere Trägervorrichtung 20 und der Stempel 14 wieder in ihre in Fig. 3 gezeigte Ruheposition gebracht, so dass sich die Feder 26 entspannt und die Auflagefläche 19 der Bogenauflage 18 wieder oberhalb der Messerschneide 13 angeordnet ist. Fig. 5 shows how the blank 30 is pressed out of the material sheet 16 by means of the punch 14. For this purpose, the control device 42 causes the further drive 38 to move the punch 14 relative to the upper punching knife 10. The stroke of the punch 14 relative to the punching knife 10 is preferably 10 to 20 mm for this purpose. An unillustrated lifting cylinder with fixed end positions serves to realize the movement of the punch. Preferably, the outer edges 14 'of the punch 14 cooperate in the manner of a pair of scissors with the knife edge 13 of the lower punch blade 12 by the contour of the punch 14 is adapted to that of the punching blade 12, so that the soul 28 is severed clean. As in Fig. 6 shown, the blank 30 falls down through the opening 24 and can be removed there or removed with a suitable transport means 46. Subsequently, the upper support device 20 and the punch 14 are again in their in Fig. 3 brought shown rest position, so that the spring 26 relaxed and the support surface 19 of the sheet support 18 is again arranged above the knife edge 13.

Statt eines elektrohydraulischen bzw. elektropneumatischen Antriebs kann auch ein Exzenterantrieb eingesetzt werden, mit dem ebenfalls eine anschlagfreie Bewegung des Stanzmessers mit vorbestimmtem Hub realisiert werden kann. Der Antrieb 38 für den Stempel 14 kann auch in den Antrieb 36 für das obere Stanzmesser 10 bzw. die obere Trägervorrichtung 20 integriert sein.Instead of an electro-hydraulic or electropneumatic drive, an eccentric drive can also be used, with which a stop-free movement of the punching blade with a predetermined stroke can likewise be realized. The drive 38 for the punch 14 can also be integrated in the drive 36 for the upper punching blade 10 and the upper support device 20.

Claims (9)

  1. Apparatus for punching blanks (30) from a material sheet (16), in particular cards from a cardboard, plastic or composite material, having hollow-cylindrical first and second punching knives (10, 12) which are attached to in each case one carrier apparatus (20, 22), lie opposite one another and interact with one another for punching, a drive (36) for at least one carrier apparatus (20) in a punching direction (S) which extends perpendicularly with respect to the said carrier apparatus (20), means for setting the cutting depth (T1, T2) of the punching knives (10, 12) in such a way that the punching knives (10, 12) are spaced apart from one another during the punching operation with the formation of a core (28) in the material sheet (16), a plunger (14) which is arranged within the first punching knife (10) and can be moved relative to the first punching knife (10), and a continuous opening (24) which extends in the punching direction (S) in the second punching knife (12) and in the carrier apparatus (22) associated to the latter, through which the blanks (30) are ejected by means of the plunger (14), characterized in that the means for setting the cutting depth of the punching knives comprise a control device (42) which actuates the drive (36) with the omission of a mechanical stop, in such a way that the direction of the relative movement of the punching knives (10, 12) is reversed when a predefined end position is reached.
  2. Punching apparatus according to Claim 1,
    characterized in that the outline of the plunger (14) is adapted to the contour of the second punching knife (12) in such a way that the core (28) is cut through during ejection of the blank (30).
  3. Punching apparatus according to Claim 1 or 2, characterized by a sheet support (18) which is arranged between the carrier apparatuses (20, 22) for inserting a material sheet (16) between the first and the second punching knife (10, 12), the sheet support (18) having a cut-out (25) in the region of the punching knives (10, 12).
  4. Punching apparatus according to Claim 3, characterized in that the carrier apparatus (22) for the second punching knife (12) is stationary and the sheet support (18) is connected to the said carrier apparatus (22) via at least one spring (26), the material sheet (16) which lies on the sheet support (18) being pushed into the second knife (12) by the movement of the first knife (10).
  5. Punching apparatus according to Claim 4, characterized in that the sheet support (18) is shaped in such a way, and is arranged spaced apart from the carrier apparatus (22) for the second punching knife (12), that the sheet support (18) can perform a stroke which is necessary for punching, without coming into contact with the carrier apparatus (22) or the second punching knife (12) or other mechanical components.
  6. Punching apparatus according to Claim 4 or 5, characterized in that the spring constant of the spring (26) is selected in such a way that the force which is necessary for pressing down the sheet support (18) is smaller than the force which is necessary for punching, preferably is smaller by a multiple.
  7. Punching apparatus according to Claim 1, characterized in that the drive (36) comprises a pneumatically or hydraulically operating reciprocating apparatus, the stroke of which can be set by means of the control apparatus (42).
  8. Method for operating a punching apparatus according to one of Claims 1 to 7, having the following steps:
    - insertion of a material sheet (16) between the first and second punching knives (10, 12);
    - movement of the punching knives (10, 12) relative to one another in the punching direction (S) towards one another, with the result that the punching knives (10, 12) are spaced apart from one another in their end position with the formation of a core (28) in the material sheet (16), the direction of the relative movement of the punching knives (10, 12) being reversed when a predefined end position is reached, without one of the carrier apparatuses (20, 22) or one of the punching knives (10, 12) being stopped by a mechanical stop;
    - movement of the plunger (14) relative to the first punching knife (10) in the punching direction (S) in order to sever the core (28) and in order to eject the blank (30) through the second punching knife (12);
    - retraction of the plunger (14) and movement of the punching knives (10, 12) back into their initial position.
  9. Method according to Claim 8, characterized in that the movement direction of the plunger (14) is reversed when a predefined end position is reached, without the plunger (14) being stopped by a mechanical stop.
EP05020381A 2005-09-19 2005-09-19 Punch and method for using such a punch Not-in-force EP1764194B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05020381A EP1764194B1 (en) 2005-09-19 2005-09-19 Punch and method for using such a punch
DE502005007795T DE502005007795D1 (en) 2005-09-19 2005-09-19 Punching device and method of operation thereof
AT05020381T ATE437731T1 (en) 2005-09-19 2005-09-19 PUNCHING DEVICE AND METHOD FOR OPERATING SAME

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05020381A EP1764194B1 (en) 2005-09-19 2005-09-19 Punch and method for using such a punch

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EP1764194A1 EP1764194A1 (en) 2007-03-21
EP1764194B1 true EP1764194B1 (en) 2009-07-29

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SE537057C2 (en) * 2012-03-13 2014-12-23 Methods and devices for cutting composite materials, and sealing devices made of composite materials
CN107283512A (en) * 2017-07-05 2017-10-24 苏州亨达尔工业材料有限公司 A kind of modified device for machining plastic plate
CN108555973B (en) * 2018-04-25 2020-04-21 温州大学激光与光电智能制造研究院 Waste discharge mechanism of paper cutter
CN113211872B (en) * 2021-01-26 2022-12-09 珠海市鼎胜胶粘塑料环保科技有限公司 Easily-degradable environment-friendly plastic bag processing technology
CN114346050B (en) * 2021-11-25 2024-04-26 安徽铭旋汽车零部件有限公司 Aluminum profile and punching device for manufacturing luggage rack cross rod
DE102022110959A1 (en) 2022-05-04 2023-11-09 TRUMPF Werkzeugmaschinen SE + Co. KG Punching device and punching process

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US2352339A (en) * 1942-09-04 1944-06-27 Western Electric Co Apparatus for blanking materials
DK423583A (en) * 1983-09-16 1985-03-17 Teknologisk Inst PROCEDURES AND TOOLS FOR CUTTING HOLES
US6401510B1 (en) * 1999-04-07 2002-06-11 3M Innovative Properties Company Method for stamping a part from a multi-layered strip
DE10230365B8 (en) * 2002-07-05 2008-09-25 Mühlbauer Ag Device and method for separating plastic cards
DE10317015A1 (en) * 2003-04-11 2004-11-11 Hans Walter Mohr Gmbh Arrangement for stamping workpieces, has stamping blades arranged along stamping opening, ejection element movably guided relative to carrying element and pressure element above carrying element

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ATE437731T1 (en) 2009-08-15
DE502005007795D1 (en) 2009-09-10

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