EP3168016B1 - Cutting tool for separating planar materials - Google Patents

Cutting tool for separating planar materials Download PDF

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Publication number
EP3168016B1
EP3168016B1 EP16186554.8A EP16186554A EP3168016B1 EP 3168016 B1 EP3168016 B1 EP 3168016B1 EP 16186554 A EP16186554 A EP 16186554A EP 3168016 B1 EP3168016 B1 EP 3168016B1
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EP
European Patent Office
Prior art keywords
cutting
teeth
cutting tool
tips
flanks
Prior art date
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Active
Application number
EP16186554.8A
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German (de)
French (fr)
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EP3168016A1 (en
Inventor
Anton Haas
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Voestalpine Precision Strip GmbH
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Voestalpine Precision Strip GmbH
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Publication of EP3168016A1 publication Critical patent/EP3168016A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/12—Straight saw blades; Strap saw blades
    • B23D61/121—Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
    • 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
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0013—Cutting members therefor consisting of a reciprocating or endless band
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations
    • 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
    • B26F2001/4436—Materials or surface treatments therefore
    • 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
    • B26F2001/4463—Methods and devices for rule setting, fixation, preparing cutting dies
    • 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
    • B26F2001/4472—Cutting edge section features
    • 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
    • B26F2001/4481—Cutters therefor; Dies therefor having special lateral or edge outlines or special surface shapes, e.g. apertures

Definitions

  • the invention relates to a cutting tool made of hardenable steel for cutting flat materials, for example cardboard, corrugated cardboard, honeycomb cardboard, plastic sheets and the like, consisting of a band-shaped base body, which in the longitudinal direction on the one hand has a working area with cutting teeth and on the other hand a support area with a support surface, optionally with a plurality of support surfaces.
  • Flat materials made of flexible materials with high local loads represent a suitable packaging means for the delivery of goods to customers or companies.
  • Selected packaging materials such as cardboard, corrugated cardboard, honeycomb cardboard, plastic sheeting and the like usually ensure the undamaged transport of even brittle, bulky goods.
  • the mostly foldable shapes of the raw packaging parts are punched out of webs or surfaces from the respective flat material, which raw packaging parts can easily be shaped into containers.
  • Cutting tools which are also called cutting lines or punching lines in technical jargon, consistently have a band-shaped base body and in its longitudinal direction have on the one hand a cutting work area and on the other hand a support area.
  • the working area or the cutting edge is usually designed with teeth in order to allow the cutting tool to easily penetrate through the material to be punched of desired undeformed cut surfaces.
  • Embodiments of the cutting edge of the tool with teeth which can also have hardened cutting edges, are known and are used with advantage.
  • the U.S. 3,203,295 discloses in a clear view a sine-cosine curve of the teeth or the cutting edges of the teeth of the cutting line with a rounded convex vertex and a uniformly shaped base point area.
  • the document EP 2 594 496 relates to a packaging apparatus with a cutting tool with at least one blade which has a plurality of first teeth and a plurality of second teeth, the first teeth being longer than the second teeth, with the characterizing features that the packaging apparatus has a film dispenser for dispensing a film comprising a thickness of less than about 30 ⁇ m and / or a Young's Modulus of less than 100,000 MPa, the packaging apparatus being configured so that the cutting tool cuts the film and a sealing tool is configured to wrap the film to seal to a tray and wherein the cutting tool forms a substantially closed shape.
  • a rotary cutting line with a cutting edge and two side surfaces is disclosed in US Pat WO 2008/068015 wherein the cutting edge has secondary facets or side surfaces and the transition between secondary facets or side surfaces and flanks of the cutting teeth is formed by polishing.
  • the EP 0 564 392 on a separation or. Punch knife with teeth for cutting through non-metallic parts, in particular made of plastic, the cutting contour provided with the teeth having additional wave crests and wave troughs.
  • the tooth tips In the case of new types of flat materials with certain mechanical property profiles such as improved shock absorption, higher buckling stability and the like, as well as the increased use of recycling materials in the production of the same, the tooth tips usually deform the surface layer during the cutting process before penetrating into the Flat material. Local indentations and deformations due to a hard and / or flexible surface of flat materials usually cause a rough, uneven cut surface.
  • Such uneven cut surfaces of a punched packaging blank can be detrimental to the appearance of a packaging and impede the machine molding of goods into the packaging.
  • the aim of the invention is to overcome the disadvantages of the previous cutting knives and to create a cutting tool of the type mentioned above, which avoids the formation of deformed cutting areas when cutting flat material by punching and creates flat cut surfaces over the cross section.
  • a further aim of the invention is to minimize the depth of penetration of the tips of the cutting tool into the yielding support of the flat material.
  • the cutting teeth are formed with tips with radii of up to 2.0 mm and, starting from these, with cutting flanks at an angle ⁇ of 60 ° to 90 ° to one another, with cutting teeth that are adjacent in the longitudinal direction of the cutting tool having a different distance between the cutting tips opposite support surface, optionally from the opposite support surfaces.
  • a design according to the invention of the working area of a cutting tool is such that the most protruding tips of the cutting teeth are at a large distance from each other at a given distance from the opposite support surface, whereby a local pressure load on the surface of the flat material is distant at the beginning of a cut.
  • the local resistance of the flat material to pressure deformation in the area of the tooth tips is high, which results in easier penetration of the tooth tips and a separation progress by means of the sharp-edged cutting edges of the tool with a low load on the surface area of the flat material.
  • Adjacent tooth tips which are less spaced from the opposite support surface, are also spaced in the longitudinal direction of the tool, which favors penetration of the tooth tips into the surface of the flat material due to high local resistance without permanent deformation.
  • a different distance from an opposite support surface of adjacent cutting teeth of a cutting tool according to the invention is essential and a respective radius of the tooth tips of less than 2 mm and an angle ⁇ of 60 ° to 90 ° of the cutting flanks to each other are significant with regard to a desired flat cut surface formation in a Punching a packaging blank from a flat material.
  • three adjacent cutting tooth tips can also be provided, each with a different spacing from the opposing support surfaces, which results in additional advantages with regard to cutting and forming the same.
  • the further objective of reducing the depth of penetration of the most distant projecting tooth tips of the tool into the base of the sheet material during the cut is achieved by the inventive embodiment of the working area of a cutting tool also by a different distance between adjacent cutting tooth tips and the opposite support surface.
  • the cutting teeth have tips with a radius of 1 mm or less, but of at least 0.1 mm, penetration of the same into the surface of the flat material can be facilitated in a favorable manner and wear of the tooth tips during the punching operation can be kept low.
  • the difference in the distances between the cutting tips of adjacent cutting teeth and the opposite support surface (s) is advantageously 0.5 to 2.0 mm, because this allows developments in the field of properties of flat materials to be taken into account.
  • the cutting flanks have a cutting edge angle ⁇ of 40 ° to 55 ° in cross section, an optimum can be achieved with regard to a low cutting pressure when separating flat material and with regard to low cutting edge wear.
  • Cutting edge wear can be further reduced if the cutting flank areas have a hardness of greater than 360 HB or 380 HV up to a depth of 0.5 mm.
  • the working area with the cutting teeth can advantageously have a wear-resistant and / or a friction-reducing surface layer.
  • Fig. 1 shows schematically an essentially known cutting tool S for cutting flat materials.
  • a band-shaped base body has a working area 1 with teeth 11, with cutting flanks 112 extending from the tooth tips 111 which enclose an angle ⁇ to one another.
  • a support area 2 of the base body has a support surface 22, from which the tips 111 of the cutting teeth 11 are at the same distance A.
  • a given tooth shape with a certain distance between the teeth 11 in the longitudinal direction results in a maximum tooth length B between the tooth tips 111 and the tooth base.
  • the tips 111 of the teeth 11 of the tool S penetrate at least a distance of the dimension B into a flexible, yielding support of the flat material.
  • FIG. 2 an embodiment of a cutting tool S according to the invention is shown in principle.
  • a cutting area 1 of the band-shaped base body has adjacent teeth 11 'with tooth tips 111' in the longitudinal direction between the most protruding and spaced apart teeth 11, i.e. in the area where the cutting flanks 112 meet. on, which have a smaller distance A 'from the support surface 22 and are thereby set back.
  • the protruding tooth tips 111 When the cutting tool S is lowered onto the flat material or in the event of a similar relative movement, the protruding tooth tips 111, which have a large distance, first penetrate the flat material, after which a cutting position through the cutting flanks 112 with a low load on the flat material up to a contact with the adjacent recessed cutting tips 111 'The cutting teeth 11' takes place.
  • the tips 111 'of the cutting teeth 11' which are at a small distance from the support surface 21, 21 ', are, however, also at a great distance from one another, penetrate the flat material without permanent deformation and complete the separation of the same by means of the cutting flanks 112'.
  • the cutting knife S By means of the cutting knife S according to the invention, not only can a flat cut of the flat material be achieved, but the extent to which the tooth tips 111 of the cutting tool S penetrate the base of a flat material is reduced to a level B, which increases the durability of the base in the punching operation.
  • the dimension B results from the greatest distance between the maximally protruding tooth tips 111 above the tooth base.
  • Cutting tools according to the invention have considerable advantages, particularly in rotary punching, including smooth machine running and reduced bending stress of the teeth, high dimensional accuracy of the blanks and the like.

Description

Die Erfindung bezieht sich auf ein Schneidwerkzeug aus härtbarem Stahl zum Trennen von Flachmaterialien, beispielsweise Pappe, Wellpappe, Wabenkarton, Kunststoffplatten und dergleichen, bestehend aus einem bandförmigen Grundkörper, der in Längsrichtung einerseits einen Arbeitsbereich mit Schneidzähnen und andererseits einen Stützbereich mit einer Stützfläche, gegebenenfalls mit einer Vielzahl von Stützflächen, aufweist.The invention relates to a cutting tool made of hardenable steel for cutting flat materials, for example cardboard, corrugated cardboard, honeycomb cardboard, plastic sheets and the like, consisting of a band-shaped base body, which in the longitudinal direction on the one hand has a working area with cutting teeth and on the other hand a support area with a support surface, optionally with a plurality of support surfaces.

Flachmaterialien aus nachgiebigen Werkstoffen bei hohen örtlichen Belastungen stellen ein geeignetes Verpackungsmittel für eine Lieferung von Gütern an Kunden oder Betriebe dar.Flat materials made of flexible materials with high local loads represent a suitable packaging means for the delivery of goods to customers or companies.

Ausgewählte Verpackungsmaterialien wie Pappe, Wellpappe, Wabenkarton, Kunststoffbahnen und dergleichen gewährleisten in der Regel einen unversehrten Transport auch von spröden sperrigen Gütern.Selected packaging materials such as cardboard, corrugated cardboard, honeycomb cardboard, plastic sheeting and the like usually ensure the undamaged transport of even brittle, bulky goods.

Für ein Verbringen von gleichgeformten und gleichartigen Gütern werden die meist faltbaren Formen der Verpackungsrohteile aus Bahnen oder Flächen aus dem jeweiligen Flächenmaterial ausgestanzt, welche Verpackungsrohteile leicht zu Behältnissen formbar sind.In order to move goods of the same shape and of the same type, the mostly foldable shapes of the raw packaging parts are punched out of webs or surfaces from the respective flat material, which raw packaging parts can easily be shaped into containers.

Ein Ausstanzen dieser Verpackungsrohteile aus dem Flachmaterial erfolgt mittels Flach- oder Rotations-Stanzeinrichtungen, welche mit Schneidwerkzeugen bestückt sind.These raw packaging parts are punched out of the flat material by means of flat or rotary punching devices which are equipped with cutting tools.

Schneidwerkzeuge, die in der Fachsprache auch Schneidlinien oder Stanzlinien genannt werden, haben durchwegs einen bandförmigen Grundkörper und weisen in dessen Längsrichtung einerseits einen schneidenden Arbeitsbereich und andererseits einen Stützbereich auf.Cutting tools, which are also called cutting lines or punching lines in technical jargon, consistently have a band-shaped base body and in its longitudinal direction have on the one hand a cutting work area and on the other hand a support area.

Der Arbeitsbereich bzw. die Schneide wird in der Regel mit Zähnen ausgebildet, um ein leichtes Durchdringen des Schneidwerkzeuges durch das Stanzgut mit einer Ausbildung von gewünscht unverformten Schnittflächen zu erreichen.The working area or the cutting edge is usually designed with teeth in order to allow the cutting tool to easily penetrate through the material to be punched of desired undeformed cut surfaces.

Ausführungsformen der Schneide des Werkzeuges mit Zähnen, welche auch gehärtete Schneidkanten aufweisen können, sind bekannt und werden mit Vorteil eingesetzt.Embodiments of the cutting edge of the tool with teeth, which can also have hardened cutting edges, are known and are used with advantage.

DieThe US 3,203,295U.S. 3,203,295 beispielsweise offenbart in einer klaren Ansicht eine Sinus-Cosinus-Kurve der Zähne beziehungsweise der Schneiden der Zähne der Schneidlinie mit einem gerundeten konvexen Scheitel und einem gleichgeformten Fußpunktbereich.for example, discloses in a clear view a sine-cosine curve of the teeth or the cutting edges of the teeth of the cutting line with a rounded convex vertex and a uniformly shaped base point area.

Das Dokument EP 2 594 496 betrifft einen Verpackungsapparat mit einem Schneidwerkzeug mit mindestens einer Klinge, welche eine Vielzahl von ersten Zähnen und eine Vielzahl von zweiten Zähnen aufweist, wobei die ersten Zähne länger als die zweiten Zähne sind, mit den kennzeichnenden Merkmalen, dass der Verpackungsapparat einen Folienspender zum Spenden einer Folie, die eine Dicke von weniger als etwa 30 µm und/oder einen Elastizitätsmodul (Young-Modul) von weniger als 100.000 MPa umfasst, wobei der Verpackungsapparat so konfiguriert ist, dass das Schneidwerkzeug die Folie schneidet und ein Siegelungswerkzeug so konfiguriert ist, um die Folie an eine Schale zu siegeln, und wobei das Schneidwerkzeug eine im Wesentlichen geschlossene Form bildet. The document EP 2 594 496 relates to a packaging apparatus with a cutting tool with at least one blade which has a plurality of first teeth and a plurality of second teeth, the first teeth being longer than the second teeth, with the characterizing features that the packaging apparatus has a film dispenser for dispensing a film comprising a thickness of less than about 30 µm and / or a Young's Modulus of less than 100,000 MPa, the packaging apparatus being configured so that the cutting tool cuts the film and a sealing tool is configured to wrap the film to seal to a tray and wherein the cutting tool forms a substantially closed shape.

Eine Rotationsschneidlinie mit einer Schneidkante und zwei Seitenflächen offenbart dieA rotary cutting line with a cutting edge and two side surfaces is disclosed in US Pat WO 2008/068015WO 2008/068015 , wobei die Schneidkante Sekundärfacetten oder Seitenflächen aufweist und der Übergang zwischen Sekundärfacetten oder Seitenflächen und Flanken der Schneidzähne durch Polieren gebildet ist.wherein the cutting edge has secondary facets or side surfaces and the transition between secondary facets or side surfaces and flanks of the cutting teeth is formed by polishing.

Des Weiteren bezieht sich dieFurthermore, the EP 0 564 392EP 0 564 392 auf ein Trenn-bzw. Stanzmesser mit Zähnen zum Durchtrennen von nichtmetallischen Teilen, insbesondere aus Kunststoff, wobei die mit den Zähnen versehene Schneidkontur zusätzliche Wellenberge und Wellentäler aufweist.on a separation or. Punch knife with teeth for cutting through non-metallic parts, in particular made of plastic, the cutting contour provided with the teeth having additional wave crests and wave troughs.

Bei neuartigen Flachmaterialien mit bestimmten mechanischen Eigenschaftsprofilen wie verbesserte Stoßaufnahme, höhere Knickstabilität und dergleichen sowie beim verstärkten Einsatz von Recyclingmaterialien bei der Herstellung derselben verformen zumeist die Zahnspitzen bei der Schnitterzeugung die Oberflächenschicht vor dem Eindringen in das Flachmaterial. Eine örtlichen Einbeulung und Verformungen durch eine harte und/oder nachgiebige Oberfläche von Flachmaterialien verursacht dadurch zumeist eine raue unebene Schnittfläche.In the case of new types of flat materials with certain mechanical property profiles such as improved shock absorption, higher buckling stability and the like, as well as the increased use of recycling materials in the production of the same, the tooth tips usually deform the surface layer during the cutting process before penetrating into the Flat material. Local indentations and deformations due to a hard and / or flexible surface of flat materials usually cause a rough, uneven cut surface.

Derartige unebene Schnittflächen eines gestanzten Verpackungsrohteiles können nachteilig für das Aussehen einer Verpackung sein und eine maschinelle Einformung von Gütern in die Verpackung behindern.Such uneven cut surfaces of a punched packaging blank can be detrimental to the appearance of a packaging and impede the machine molding of goods into the packaging.

Die Erfindung setzt sich zum Ziel, die Nachteile der bisherigen Trennmesser zu überwinden und ein Schneidwerkzeug der eingangs genannten Art zu schaffen, welches bei einer Durchtrennung von Flachmaterial durch Stanzen eine Ausbildung von verformten Schnittbereichen vermeidet und über den Querschnitt ebene Schnittflächen erstellt.The aim of the invention is to overcome the disadvantages of the previous cutting knives and to create a cutting tool of the type mentioned above, which avoids the formation of deformed cutting areas when cutting flat material by punching and creates flat cut surfaces over the cross section.

Weiters ist es das Ziel der Erfindung, die Eindringtiefen der Spitzen des Schneidwerkzeuges in die nachgebende Abstützung des Flachmaterials zu minimieren. Diese Ziele werden dadurch erreicht, dass die Schneidzähne mit Spitzen mit Radien bis 2.0 mm und von diesen ausgehend mit Schneidflanken mit einem Winkel α von 60° bis 90° zueinander gebildet sind, wobei in Längsrichtung des Schneidwerkzeuges benachbarte Schneidzähne einen unterschiedlichen Abstand der Schneidspitzen von der gegenüberliegenden Stützfläche, gegebenenfalls von den gegenüberliegenden Stützflächen, aufweisen. Eine erfindungsgemäße Ausbildung des Arbeitsbereiches eines Schneidwerkzeuges ist derart, dass die am weitesten vorragenden Spitzen der Schneidzähne mit einem jeweils gegebenen Abstand von der gegenüberliegenden Stützfläche voneinander einen großen Abstand aufweisen, wodurch bei Beginn einer Schnitterstellung eine örtliche Druckbelastung der Oberfläche des Flachmaterials weit distanziert ist. Beim Anstellen des Werkzeuges ist derart im Bereich der Zahnspitzen der örtliche Widerstand des Flachmaterials gegen Druckverformung hoch, was ein leichteres Eindringen der Zahnspitzen und einen Trennfortschritt mittels der scharfkantigen Schneidflanken des Werkzeuges mit einer geringen Belastung des Oberflächenbereiches des Flachmaterials bewirkt.A further aim of the invention is to minimize the depth of penetration of the tips of the cutting tool into the yielding support of the flat material. These goals are achieved in that the cutting teeth are formed with tips with radii of up to 2.0 mm and, starting from these, with cutting flanks at an angle α of 60 ° to 90 ° to one another, with cutting teeth that are adjacent in the longitudinal direction of the cutting tool having a different distance between the cutting tips opposite support surface, optionally from the opposite support surfaces. A design according to the invention of the working area of a cutting tool is such that the most protruding tips of the cutting teeth are at a large distance from each other at a given distance from the opposite support surface, whereby a local pressure load on the surface of the flat material is distant at the beginning of a cut. When the tool is positioned, the local resistance of the flat material to pressure deformation in the area of the tooth tips is high, which results in easier penetration of the tooth tips and a separation progress by means of the sharp-edged cutting edges of the tool with a low load on the surface area of the flat material.

Benachbarte, im Vergleich mit den vorragenden, einen geringeren Abstand von der gegenüberliegenden Stützfläche aufweisenden Zahnspitzen sind in Längsrichtung des Werkzeuges ebenso distanziert, was ein Eindringen der Zahnspitzen in die Oberfläche des Flachmaterials durch einen hohen örtlichen Widerstand ohne bleibende Verformung begünstigt.Adjacent tooth tips, which are less spaced from the opposite support surface, are also spaced in the longitudinal direction of the tool, which favors penetration of the tooth tips into the surface of the flat material due to high local resistance without permanent deformation.

Ein unterschiedlicher Abstand von einer gegenüberliegenden Stützfläche von benachbarten Schneidzähnen eines erfindungsgemäßen Schneidwerkzeuges ist wesentlich und ein jeweiliger Radius der Zahnspitzen von geringer als 2 mm sowie ein Winkel α von 60° bis 90° der Schneidflanken zueinander sind erheblich im Hinblick auf eine gewünschte ebene Schnittflächenausbildung bei einem Stanzen eines Verpackungsrohlings aus einem Flachmaterial.A different distance from an opposite support surface of adjacent cutting teeth of a cutting tool according to the invention is essential and a respective radius of the tooth tips of less than 2 mm and an angle α of 60 ° to 90 ° of the cutting flanks to each other are significant with regard to a desired flat cut surface formation in a Punching a packaging blank from a flat material.

In einer Ausbildungsform eines erfindungsgemäßen Schneidwerkzeuges können auch drei jeweils benachbarte Schneidzahnspitzen mit jeweils unterschiedlichem Abstand zu den gegenüberliegenden Stützflächen vorgesehen sein, wodurch sich zusätzliche Vorteile im Hinblick auf eine Schnitterstellung und Ausbildung derselben ergeben.In one embodiment of a cutting tool according to the invention, three adjacent cutting tooth tips can also be provided, each with a different spacing from the opposing support surfaces, which results in additional advantages with regard to cutting and forming the same.

Die weitere Zielsetzung, die Eindringtiefe von beabstandet weitest vorragenden Zahnspitzen des Werkzeuges in die Unterlage des Flächenmateriales beim Schnitt zu verringern, löst die erfindungsgemäße Ausführungsform des Arbeitsbereiches eines Schneidwerkzeuges ebenfalls durch einen unterschiedlichen Abstand von benachbarten Schneidzahnspitzen von der gegenüberliegenden Stützfläche.The further objective of reducing the depth of penetration of the most distant projecting tooth tips of the tool into the base of the sheet material during the cut is achieved by the inventive embodiment of the working area of a cutting tool also by a different distance between adjacent cutting tooth tips and the opposite support surface.

Wenn die Schneidzähne Spitzen mit einem Radius von 1 mm oder geringer, jedoch von mindestens 0.1 mm aufweisen, kann in günstiger Weise ein Eindringen derselben in die Oberfläche des Flachmaterials erleichtert und eine Abnützung der Zahnspitzen im Stanzbetrieb gering gehalten werden.If the cutting teeth have tips with a radius of 1 mm or less, but of at least 0.1 mm, penetration of the same into the surface of the flat material can be facilitated in a favorable manner and wear of the tooth tips during the punching operation can be kept low.

Mit Vorteil beträgt der Unterschied der Abstände der Schneidspitzen benachbarter Schneidzähne von der(den) gegenüberliegenden Stützfläche(n) 0.5 bis 2.0 mm, weil dadurch den Entwicklungen auf dem Gebiet der Eigenschaften der Flachmaterialien Rechnung getragen werden kann.The difference in the distances between the cutting tips of adjacent cutting teeth and the opposite support surface (s) is advantageously 0.5 to 2.0 mm, because this allows developments in the field of properties of flat materials to be taken into account.

Im Hinblick auf eine Stabilität des Flachmaterials bei einer Schnitterzeugung bzw. einer Stanzung hat es sich als günstig herausgestellt, wenn die Schneidflanken der Zähne jeweils einen gleichen Winkel α von 65° bis 75° zueinander aufweisen.With regard to the stability of the flat material when a cut is produced or punched, it has been found to be favorable if the cutting flanks of the teeth each have an equal angle α of 65 ° to 75 ° to one another.

Wenn in vorteilhafter Weise die Schneidflanken im Querschnitt einen Schneidenwinkel β von 40° bis 55° aufweisen, kann ein Optimum betreffend einen geringen Schneiddruck bei einer Trennung von Flachmaterial und betreffend einen geringen Schneidkantenverschleiß erreicht werden.If, in an advantageous manner, the cutting flanks have a cutting edge angle β of 40 ° to 55 ° in cross section, an optimum can be achieved with regard to a low cutting pressure when separating flat material and with regard to low cutting edge wear.

Ein Schneidkantenverschleiß kann weiter verringert werden, wenn die Schneidflankenbereiche bis zu einer Tiefe von 0.5 mm eine Härte von größer als 360 HB bzw. 380 HV aufweisen.Cutting edge wear can be further reduced if the cutting flank areas have a hardness of greater than 360 HB or 380 HV up to a depth of 0.5 mm.

Mit Vorteil kann bei erfindungsgemäßen Schneidwerkzeug der Arbeitsbereich mit den Schneidzähnen eine verschleißfeste und/oder eine reibungsmindernde Oberflächenschicht tragen.With the cutting tool according to the invention, the working area with the cutting teeth can advantageously have a wear-resistant and / or a friction-reducing surface layer.

Im Folgenden soll die Erfindung an schematischen Prinzipskizzen, die allenfalls nur einen Ausführungsweg derselben darstellen, im Vergleich mit dem Stand der Technik näher erläutert werden:
Es zeigen:

  • Fig.1 ein Schneidwerkzeug gemäß dem Stand der Technik
  • Fig. 2 ein erfindungsgemäßes Schneidwerkzeug zum Trennen von Flachmaterialien
  • Fig. 3 eine Ausbildungsform eines erfindungsgemäßen Schneidwerkzeuges
In the following, the invention is to be explained in more detail in comparison with the prior art using schematic principle sketches, which at most only represent one embodiment of the same:
Show it:
  • Fig.1 a cutting tool according to the prior art
  • Fig. 2 a cutting tool according to the invention for cutting flat materials
  • Fig. 3 an embodiment of a cutting tool according to the invention

Zur leichteren Zuordnung der Komponenten des erfindungsgemäßen Schneidwerkzeuges soll nachfolgende Bezugszeichenliste dienen.

S
Schneidwerkzeug
1
Arbeitsbereich
11,11',11"
Schneidzähne
111,111',111"
Spitzen der Schneidzähne
112,112',112"
Schneidflanken
α
Winkel gegenüberliegender Schneidflanken zueinander
2
Stützbereich
22,22'
Stützfläche(n)
A,A',A"
Abstand der Schneidzahnspitzen von der Stützfläche
B,B',B"
Zahnlänge zwischen den am weitesten vorragenden Zahnspitzen und dem Zahngrund
The following list of reference symbols is intended to facilitate assignment of the components of the cutting tool according to the invention.
S.
Cutting tool
1
Workspace
11.11 ', 11 "
Cutting teeth
111,111 ', 111 "
Tips of the cutting teeth
112,112 ', 112 "
Cutting edges
α
Angle of opposite cutting edges to each other
2
Support area
22.22 '
Support surface (s)
A, A ', A "
Distance of the cutting tooth tips from the support surface
B, B ', B "
Tooth length between the most protruding tooth tips and the tooth base

Fig. 1 zeigt schematisch ein im Wesentlichen bekanntes Schneidwerkzeug S zum Trennen von Flachmaterialien. Fig. 1 shows schematically an essentially known cutting tool S for cutting flat materials.

Ein bandförmiger Grundkörper weist einen Arbeitsbereich 1 mit Zähnen 11 auf, wobei von den Zahnspitzen 111 Schneidflanken 112 ausgehen, welche einen Winkel α zueinander einschließen.A band-shaped base body has a working area 1 with teeth 11, with cutting flanks 112 extending from the tooth tips 111 which enclose an angle α to one another.

Ein Stützbereich 2 des Grundkörpers hat eine Stützfläche 22, zu welcher die Spitzen 111 der Schneidzähne 11 einen gleichen Abstand A haben.A support area 2 of the base body has a support surface 22, from which the tips 111 of the cutting teeth 11 are at the same distance A.

Aus einer gegebenen Zahnform mit einer bestimmten Beabstandung der Zähne 11 in Längsrichtung ergibt sich eine maximale Zahnlänge B zwischen den Zahnspitzen 111 und dem Zahngrund.A given tooth shape with a certain distance between the teeth 11 in the longitudinal direction results in a maximum tooth length B between the tooth tips 111 and the tooth base.

Bei einem Durchstanzen eines Flachmaterials dringen die Spitzen 111 der Zähne 11 des Werkzeuges S mindestens mit einer Strecke vom Ausmaß B in eine flexible nachgebende Abstützung des Flachmaterials ein.When punching through a flat material, the tips 111 of the teeth 11 of the tool S penetrate at least a distance of the dimension B into a flexible, yielding support of the flat material.

In Fig. 2 ist prinzipiell eine Ausführungsform eines erfindungsgemäßen Schneidwerkzeuges S gezeigt.In Fig. 2 an embodiment of a cutting tool S according to the invention is shown in principle.

Ein Schneidbereich 1 des bandförmigen Grundkörpers weist in Längsrichtung zwischen den am weitesten vorragenden und beabstandeten Zähnen 11, also im Bereich der Zusammenführung der Schneidflanken 112, benachbarte Zähne 11' mit Zahnspitzen 111' auf, welche einen geringeren Abstand A' zur Stützfläche 22 haben und dadurch rückversetzt sind.A cutting area 1 of the band-shaped base body has adjacent teeth 11 'with tooth tips 111' in the longitudinal direction between the most protruding and spaced apart teeth 11, i.e. in the area where the cutting flanks 112 meet. on, which have a smaller distance A 'from the support surface 22 and are thereby set back.

Bei einem Absenken des Schneidwerkzeuges S auf das Flachmaterial oder bei einer dergleichen Relativbewegung dringen vorerst die vorragenden, eine große Distanz aufweisenden Zahnspitzen 111 in dieses ein, wonach eine Schnitterstellung durch die Schneidflanken 112 mit geringer Belastung des Flachmaterials bis zu einer Berührung der benachbarten rückversetzten Schneidspitzen 111' der Schneidzähne 11' erfolgt.When the cutting tool S is lowered onto the flat material or in the event of a similar relative movement, the protruding tooth tips 111, which have a large distance, first penetrate the flat material, after which a cutting position through the cutting flanks 112 with a low load on the flat material up to a contact with the adjacent recessed cutting tips 111 'The cutting teeth 11' takes place.

Die einen geringen Abstand zur Stützfläche 21, 21' aufweisenden Spitzen 111' der Schneidzähne 11' sind voneinander jedoch ebenfalls weit distanziert, dringen ohne bleibende Verformung in das Flachmaterial ein und vervollständigen die Trennung desselben mittels der Schneidflanken 112'.The tips 111 'of the cutting teeth 11', which are at a small distance from the support surface 21, 21 ', are, however, also at a great distance from one another, penetrate the flat material without permanent deformation and complete the separation of the same by means of the cutting flanks 112'.

Mittels des erfindungsgemäßen Schneidmessers S kann nicht nur ein ebener Schnitt des Flachmaterials erreicht werden, sondern das Ausmaß des Eindringens der Zahnspitzen 111 des Schneidwerkzeuges S in die Unterlage eines Flachmaterials wird auf ein Maß B verringert, was eine Steigerung der Haltbarkeit der Unterlage im Stanzbetrieb bewirkt.By means of the cutting knife S according to the invention, not only can a flat cut of the flat material be achieved, but the extent to which the tooth tips 111 of the cutting tool S penetrate the base of a flat material is reduced to a level B, which increases the durability of the base in the punching operation.

Das Maß B ergibt sich aus dem größten Abstand der maximal vorragenden Zahnspitzen 111 über dem Zahngrund.The dimension B results from the greatest distance between the maximally protruding tooth tips 111 above the tooth base.

Wie aus Fig. 3 ersichtlich ist, können bei einer Weiterbildung eines erfindungsgemäßen Stanzwerkzeuges S zwischen den am weitesten vorragenden Zähnen 11 und den rückversetzten Zähnen 11" weiter rückversetzte Zähne 11" im Arbeitsbereich 1 angeordnet sein.How out Fig. 3 As can be seen, in a further development of a punching tool S according to the invention, further set back teeth 11 "can be arranged in the working area 1 between the teeth 11 protruding the farthest and the teeth 11" set back.

Bei allen Vorteilen wird bei einer derartigen Ausführungsform der Schneidzähne 11,11', 11" im Arbeitsbereich 1 eine Eindringtiefe B der vorragenden Zähne 11 in eine Unterlage eines Flachmaterials weiter verringert.With all the advantages, with such an embodiment of the cutting teeth 11, 11 ', 11 "in the working area 1, a penetration depth B of the protruding teeth 11 into a base of a flat material is further reduced.

Erfindungsgemäße Schneidwerkzeuge weisen insbesondere beim Rotationsstanzen erhebliche Vorteile, unter anderem gleichmäßigen Maschinenlauf, reduzierte Biegebeanspruchung der Zähne, hohe Maßgenauigkeit der Zuschnitte und dergleichen, auf.Cutting tools according to the invention have considerable advantages, particularly in rotary punching, including smooth machine running and reduced bending stress of the teeth, high dimensional accuracy of the blanks and the like.

Claims (6)

  1. Cutting tool (S) made from hardenable steel for severing flat materials positioned on a resilient support, for example cardboard, corrugated board, honeycomb cardboard, plastic panels and the like, consisting of a band-shaped base body which has, in the longitudinal direction, on one side a working region (1) with cutting teeth (11) and on the other side a supporting region (2) with a supporting surface (22), optionally with a plurality of supporting surfaces (22, 22'), characterised in that the cutting tool (S), when cutting the flat material, cooperates with the flexible resilient support thereof and the cutting teeth (11) are formed with the tips (111) with radii of at least 0.1 mm to 2.0 mm and cutting flanks (112, 112', 112") emanating from said tips at an angle α of 60° to 90° to one another, wherein, in the longitudinal direction of the cutting tool (S), the difference in the distances (A, A', A") from the cutting tips (111, 111', 111") of adjacent cutting teeth (11, 11', 11") to the opposite supporting surface (22), optionally to the opposite supporting surfaces (22, 22'), is 0.5 to 2.0 mm.
  2. Cutting tool according to claim 1, characterised in that the cutting teeth (11, 11', 11") have tips (111, 111', 111") with a radius of 1 mm or less, but of at least 0.1 mm.
  3. Cutting tool according to any of claims 1 or 2, characterised in that the cutting flanks (112, 112', 112") of the teeth each have an identical angle α of 65° to 75° to one another.
  4. Cutting tool according to claim 1 or 3, characterised in that the cutting flanks (112, 112', 112") have a cutting angle β of 40° to 55° in the cross-section of said cutting flanks.
  5. Cutting tool according to any of claims 1 to 4, characterised in that the cutting flank regions have a hardness greater than 360 HB or 380 HV up to a depth of 0.5 mm.
  6. Cutting tool according to any of claims 1 to 5, characterised in that the working region (1) with the cutting teeth (11, 11', 11") has a wear-resistant and/or friction-reducing surface layer.
EP16186554.8A 2015-10-14 2016-08-31 Cutting tool for separating planar materials Active EP3168016B1 (en)

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CN114713921B (en) * 2021-01-05 2023-07-18 中国航发商用航空发动机有限责任公司 Support removing tool and support removing method

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US20170106459A1 (en) 2017-04-20
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