EP1861217A1 - Reversible tip cutter for rotary milling - Google Patents

Reversible tip cutter for rotary milling

Info

Publication number
EP1861217A1
EP1861217A1 EP06704746A EP06704746A EP1861217A1 EP 1861217 A1 EP1861217 A1 EP 1861217A1 EP 06704746 A EP06704746 A EP 06704746A EP 06704746 A EP06704746 A EP 06704746A EP 1861217 A1 EP1861217 A1 EP 1861217A1
Authority
EP
European Patent Office
Prior art keywords
cutting edge
cutting
peeling
plate
rounding
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.)
Withdrawn
Application number
EP06704746A
Other languages
German (de)
French (fr)
Inventor
Walter Bärnthaler
Helmut Trink
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.)
Bohlerit Gesmbh & Cokg
Boehlerit GmbH and Co KG
Original Assignee
Bohlerit Gesmbh & Cokg
Boehlerit GmbH and Co KG
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 Bohlerit Gesmbh & Cokg, Boehlerit GmbH and Co KG filed Critical Bohlerit Gesmbh & Cokg
Publication of EP1861217A1 publication Critical patent/EP1861217A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/08—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
    • B23B5/12—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning for peeling bars or tubes by making use of cutting bits arranged around the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/08—Rake or top surfaces
    • B23B2200/086—Rake or top surfaces with one or more grooves
    • B23B2200/087—Rake or top surfaces with one or more grooves for chip breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/123—Side or flank surfaces curved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/20—Top or side views of the cutting edge
    • B23B2200/201—Details of the nose radius and immediately surrounding area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/20—Top or side views of the cutting edge
    • B23B2200/202—Top or side views of the cutting edge with curved cutting edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2220/00—Details of turning, boring or drilling processes
    • B23B2220/40—Peeling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
    • Y10T407/245—Cutters, for shaping with chip breaker, guide or deflector comprising concave surface in cutting face of tool

Definitions

  • the invention relates to a cutting plate for rotary peeling with polygonal in plan view, comprising at least one main cutting edge and at an obtuse angle to this a secondary cutting edge.
  • a production of semi-finished products usually takes place by hot working of the starting material. Before further processing of the semifinished product, it may be necessary to machine its surface in order to remove it from this deformation recess and / or oxide skins and / or faults. Also, such an optionally desired dimensional accuracy of the semifinished product is achieved.
  • Semi-finished products with a round cross-section can be machined by cylindrical grinding, turning or rotary peeling, and for economic reasons large-size batches usually involve rotary peeling of the round bars.
  • a device for rotary peeling has in principle a rotating, called rotary head or peeling head tool with at least three inwardly directed cutting blades whose cutting circle has a smaller diameter than the round rod to be machined.
  • the round rod is inserted, being removed in the passage through the device by means of the blades of these superficial chips. Sequentially, such highly economical round rods or rods of large batches with machined surface can be produced.
  • peeling plates in plan view have a polygonal shape with a main cutting edge for the frustoconical circle and at an obtuse angle of about 155 ° to a Secondary cutting edge or smoothing blade whose flight circle is essentially parallel to the axis of rotation or to this with the same distance.
  • the smoothing blade also has a supporting effect on the machined rod and guides it centrally in the peeling head.
  • the invention seeks to eliminate these disadvantages and sets itself the goal of creating a cutting insert of the type mentioned, which allows a rotary peel with quiet machine running or quiet Abspanung with low electrical power consumption, chatter marks avoids the rod and an increased life of the cutting at Increased Abspan antique provides.
  • connection region between the main cutting edge and secondary cutting edge is rounded with the proviso that the local radius of curvature of the rounding has a length of greater than 15 mm, but smaller than 35 mm.
  • the connecting region between the main cutting edge and the secondary cutting edge is curved in a circular shape. In this way, the manufacture of the cutting plates can be simplified.
  • a smooth chip formation during the peeling process and a further reduction of the electrical power consumption of the machine during peeling can, as was found, be promoted if the respective local radius of curvature of the rounding of the cutting plate from the main cutting edge to the secondary cutting edge is increased.
  • the chip removal can be improved particularly effectively and the chip shape can be designed as desired.
  • the minor cutting edge of the cutting plate as a smoothing blade or sheet cutting edge with a radius of 500 to 1500 mm, preferably from 700 to 1200 mm, be formed.
  • a particularly good billet surface with low roughness and small dimensional tolerances during peeling is reached.
  • a particularly simple and favorable form of cutting insert with excellent cutting properties and good cutting strength can be achieved if the main cutting edge is designed as a circular cutting edge with a radius of less than 60 mm.
  • the cutting plate is designed as a turning peeling plate with at least four cutting areas and carries a deposit or a multi-layer hard coating, the highest possible economy is achievable with a peeling process of round bars.
  • Fig. 1 Shapes (schematic) of peeling plates in plan view
  • Fig. 2 peeling plate in perspective view
  • Fig. 3 peeling plate according to the invention in plan view
  • FIG. 1 each designated by letters, various polygonal indexable inserts for rotary peeling in plan view are shown schematically.
  • Each of the cutting plates according to the prior art has at least one main cutting edge and at least one secondary cutting edge for a chip removal, which edges form an obtuse angle with one another.
  • An installation of indexable inserts takes place in cassettes of a cutting head such that in each case a secondary or smoothing edge of a cutting plate is directed substantially parallel to the axis of a billet to be peeled or a rotation axis of a peeling tool and a main cutting edge outwardly against a feed direction of the billet runs.
  • a specific polygonal shape of a cutting insert is not required; the course of the main and secondary cutting edges alone is essential.
  • a cutting plate 1 for a tool for rotary peeling is schematically removed in a perspective view.
  • the cutting plate 1 is formed as an indexable insert and has in each case a main cutting edge 2,2 * and a secondary cutting edge 3,3 ', which is often referred to as a smoothing blade, as well as a sharp-edged connection region 4 between the main cutting edge 2 and secondary cutting edge 3.
  • FIG. 3 shows an indexable insert 1 or peeling plate 1 according to the invention with flat frontal support surfaces.
  • a minor cutting edge 3,3 ' has a radius R3 of, for example, 1000 mm, wherein the cutting edge is directed substantially parallel to the stick axis or axis of rotation of a peeling head.
  • a connecting region 4, 4 'of secondary cutting edge 3, 3' and main cutting edge 2, 2 ' is rounded and, according to the invention, has a radius of curvature R 4.
  • An adjoining main cutting edge 2, 2 ' can be formed straight or preferably as a circular cutting edge 2, 2' with a radius R 2.
  • a main cutting edge may have 2,2 'different geometric line shapes, but it is essential to the invention that it has a local radius of curvature greater than 15 mm, but smaller than 35 mm.
  • An insert 1 for rotary peeling can advantageously have coplanar contact surfaces, wherein the chip surface part thereof is at least in a region of a main cutting edge 2,2 ', preferably parallel to the main cutting edge 2,2', connecting region 4,4 'and secondary cutting edge 3,3 * a chip forming trough 5, 5 'has.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

The invention relates to a tip cutter for rotary milling comprising a polygonal form when viewed from above. Said cutter comprises at least one primary cutting edge and a secondary cutting edge that is situated at an obtuse angle to the latter. The aim of the invention is to achieve an increased machining performance without causing chatter marks on the round bar that is being machined and a quiet milling operation. To achieve this, the invention discloses tip cutters (1) with a polygonal form when viewed from above, comprising at least one primary cutting edge (2) and a secondary cutting edge (3) that is situated at an obtuse angle to the latter. The connecting region (4) between the primary cutting edge (2) and the secondary cutting edge (3) is rounded, with the proviso that the local radius of curvature (R4) of the rounded section is greater than 15 mm, but less than 35 mm.

Description

Wendeschneidplatte zum Drehschälen Indexable insert for rotary peeling
Die Erfindung betrifft eine Schneidplatte zum Drehschälen mit in der Draufsicht polygonaler Form, enthaltend mindestens eine Hauptschneide und im stumpfen Winkel zu dieser eine Nebenschneide.The invention relates to a cutting plate for rotary peeling with polygonal in plan view, comprising at least one main cutting edge and at an obtuse angle to this a secondary cutting edge.
Eine Fertigung von Halbzeug, beispielsweise aus Edelstahl oder aus hochlegierten Werkstoffen, erfolgt in der Regel durch eine Warmumformung des Vormaterials. Vor einer Weiterverarbeitung des Halbzeuges kann es erforderlich sein, dessen Oberfläche spanend zu bearbeiten, um von dieser Verformungsmulden und/oder Oxidhäute bzw. Zunderlagen und/oder Fehler zu beseitigen. Auch wird derart eine gegebenenfalls gewünschte Maßgenauigkeit des Halbzeuges erreicht.A production of semi-finished products, for example made of stainless steel or high-alloy materials, usually takes place by hot working of the starting material. Before further processing of the semifinished product, it may be necessary to machine its surface in order to remove it from this deformation recess and / or oxide skins and / or faults. Also, such an optionally desired dimensional accuracy of the semifinished product is achieved.
Halbzeug mit rundem Querschnitt kann durch Rundschleifen, Drehen oder Drehschälen bearbeitet werden, wobei aus wirtschaftlichen Gründen bei größeren Losgrößen zumeist ein Drehschälen der Rundstäbe vorgenommen wird.Semi-finished products with a round cross-section can be machined by cylindrical grinding, turning or rotary peeling, and for economic reasons large-size batches usually involve rotary peeling of the round bars.
Eine Einrichtung zum Drehschälen weist prinzipiell ein rotierendes, als Drehkopf oder Schälkopf bezeichnetes Werkzeug mit mindestens drei nach innen gerichteten Schneidmessern auf, deren Schneidenflugkreis einen geringeren Durchmesser als der zu bearbeitende Rundstab besitzt. In das sich drehende Werkzeug wird der Rundstab eingeschoben, wobei im Durchlauf durch die Einrichtung mittels der Messer von diesen oberflächlich Späne abgenommen werden. Sequenziell sind derart höchst wirtschaftlich Rundstäbe oder Stangen von großen Fertigungslosen mit bearbeiteter Oberfläche herstellbar.A device for rotary peeling has in principle a rotating, called rotary head or peeling head tool with at least three inwardly directed cutting blades whose cutting circle has a smaller diameter than the round rod to be machined. In the rotating tool, the round rod is inserted, being removed in the passage through the device by means of the blades of these superficial chips. Sequentially, such highly economical round rods or rods of large batches with machined surface can be produced.
In modernen Drehschäleinrichtungen werden im Schälkopf sogenannte Kassetten, welche zumeist aus Hartmetall gebildete Schneidplatten aufweisen, eingesetzt und befestigt. Die jeweilige Form der Schneidplatte bzw. Schälplatte ist dabei vom Werkzeugsystem der Schälmaschine abhängig, in jedem Fall bildet jedoch der Flugkreis der Schneide in dieser eintragsseitig einen Kegelstumpf gefolgt von einem Zylinderteil in Austragsrichtung. Dementsprechend besitzen Schälplatten in Draufsicht eine polygonale Form mit einer Hauptschneide für den kegelstumpfförmigen Flugkreis und im stumpfen Winkel von ca 155° dazu eine Nebenschneide oder Glättschneide, deren Flugkreis im Wesentlichen parallel zur Drehachse bzw. zu dieser mit gleichem Abstand verläuft. Die Glättschneide wirkt auch stützend für den bearbeiteten Stab und führt diesen zentrisch im Schälkopf.In modern rotary peeling devices so-called cassettes, which generally comprise inserts made of hard metal, are inserted and fastened in the peeling head. The respective shape of the cutting plate or peeling plate is dependent on the tooling system of the peeling machine, but in any case forms the circle of the cutting edge in this entry side a truncated cone followed by a cylinder part in the discharge. Accordingly, peeling plates in plan view have a polygonal shape with a main cutting edge for the frustoconical circle and at an obtuse angle of about 155 ° to a Secondary cutting edge or smoothing blade whose flight circle is essentially parallel to the axis of rotation or to this with the same distance. The smoothing blade also has a supporting effect on the machined rod and guides it centrally in the peeling head.
Im groben Schälbetrieb, insbesondere bei Stabmaterial aus rostfreien Stählen, hoch nickelhältigen Legierungen und zähfesten Werkstoffen, kann es beim Einsatz von bekannten Schneidplattenformen vermehrt zu Rattererscheinungen des Werkzeuges kommen, wodurch sich auf der bearbeiteten Oberfläche sogenannte Rattermarken ausbilden. Sowohl die elektrische Leistungsaufnahme der Schälmaschine ist dabei erhöht als auch die Standzeit der Schälplatten abgesenkt erscheint.In coarse peeling operation, in particular in rod material made of stainless steels, high nickel-containing alloys and tough materials, it can cause the use of known cutting plate shapes increasingly to chatter the tool, resulting in so-called chatter marks form on the machined surface. Both the electrical power consumption of the peeling machine is increased and the service life of the peeling plates appears lowered.
Hier will die Erfindung diese Nachteile beseitigen und setzt sich zum Ziel, eine Schneidplatte der einganges genannten Art zu schaffen, welche ein Drehschälen mit ruhigem Maschinenlauf bzw. bei ruhiger Abspanung mit geringer elektrischer Leistungsaufnahme ermöglicht, Rattermarken am Stab vermeidet und eine erhöhte Standzeit der Schneiden bei gesteigerter Abspanleistung erbringt.Here, the invention seeks to eliminate these disadvantages and sets itself the goal of creating a cutting insert of the type mentioned, which allows a rotary peel with quiet machine running or quiet Abspanung with low electrical power consumption, chatter marks avoids the rod and an increased life of the cutting at Increased Abspanleistung provides.
Dieses Ziel wird bei einer gattungsgemäßen Schneidplatte dadurch erreicht, dass der Verbindungsbereich zwischen Hauptschneide und Nebenschneide mit der Maßgabe gerundet ist, dass der örtliche Krümmungsradius der Rundung eine Länge von größer 15 mm, jedoch kleiner als 35 mm, aufweist.This aim is achieved in a generic cutting plate characterized in that the connection region between the main cutting edge and secondary cutting edge is rounded with the proviso that the local radius of curvature of the rounding has a length of greater than 15 mm, but smaller than 35 mm.
Die mit der Erfindung erreichten Vorteile sind im Wesentlichen darin zu sehen, dass bei einem Drehschälen mit einer erfindungsgemäßen Schneidenausbildung auch bei schwer spanbaren Werkstoffen, wie beispielsweise hoch chromhaltige Stähle, austenitische Chrom-Nickelstähle und dergleichen Materialien, eine befürchtete Reißspanbildung mit Rattererscheinungen vermieden werden kann und bei einer verminderten Leistungsaufnahme des Antriebes der Schäleinrichtung eine ruhige Spanbildung mit vergleichsweiser glatter Bearbeitungsoberfläche der Rundstäbe erreicht wird, wobei eine Schneidhaltigkeit der Werkzeuge verbessert ist. Der Grund einer verbesserten Schälspanbildung durch die erfindungsgemäße Schneidengeometrie ist noch nicht vollkommen geklärt, jedoch könnte eine Vermeidung von sprunghaften Spandickenänderungen eine Ursache darstellen. Eine weitere Verbesserung der Schälspanung kann erreicht werden, wenn der Verbindungsbereich einen örtlichen Krümmungsradius der Rundung größer 20 mm, jedoch kleiner 33 mm, aufweist.The advantages achieved by the invention are essentially to be seen in the fact that in a rotary peeling with a cutting edge according to the invention even with difficult-to-cut materials, such as high chromium steels, austenitic chromium-nickel steels and the like materials, a feared Reißspanbildung can be avoided with chattering and at a reduced power consumption of the drive of the peeling device quiet chip formation is achieved with comparatively smooth machining surface of the round rods, wherein a cutting strength of the tools is improved. The reason for an improved peeling chip formation due to the cutting geometry according to the invention has not yet been completely clarified, but an avoidance of sudden chip thickness changes could be a cause. A further improvement in the peeling tension can be achieved if the connection area has a local radius of curvature of rounding greater than 20 mm but less than 33 mm.
Vorteilhaft ist auch eine Ausführungsvariante, bei welcher der Verbindungsbereich zwischen Hauptschneide und Nebenschneide kreisfömig gekrümmt ist. Derart kann die Herstellung der Schneidplatten vereinfacht werden.Also advantageous is a variant in which the connecting region between the main cutting edge and the secondary cutting edge is curved in a circular shape. In this way, the manufacture of the cutting plates can be simplified.
Eine ruhige Spanbildung beim Schälvorgang und eine weitere Senkung der elektrischen Leistungsaufnahme der Maschine beim Schälen kann, wie gefunden wurde, gefördert werden, wenn der jeweilige örtliche Krümmungsradius der Rundung der Schneidplatte von der Hauptschneide zur Nebenschneide hin vergrößert ist.A smooth chip formation during the peeling process and a further reduction of the electrical power consumption of the machine during peeling can, as was found, be promoted if the respective local radius of curvature of the rounding of the cutting plate from the main cutting edge to the secondary cutting edge is increased.
Wenn dabei die Rundung die Form eines Teiles einer Hyperbel oder einer Parabel besitzt, kann besonders wirksam die Abspanung verbessert und die Spanform gewünscht gestaltet werden.In this case, if the rounding has the shape of a part of a hyperbola or a parabola, the chip removal can be improved particularly effectively and the chip shape can be designed as desired.
Nach einer besonders bevorzugten Ausgestaltung der Erfindung kann die Nebenschneide der Schneidplatte als Glättschneide oder Bogenschneide mit einem Radius von 500 bis 1500 mm, vorzugsweise von 700 bis 1200 mm, ausgebildet sein. Mit derartig geformten Schneiden ist eine besonders gute Knüppeloberfläche mit geringer Rauhtiefe und geringen Maßtoleranzen beim Schälen erreichbar.According to a particularly preferred embodiment of the invention, the minor cutting edge of the cutting plate as a smoothing blade or sheet cutting edge with a radius of 500 to 1500 mm, preferably from 700 to 1200 mm, be formed. With such shaped cutting a particularly good billet surface with low roughness and small dimensional tolerances during peeling is reached.
Eine besonders einfache und günstige Form einer Schneidplatte mit vorzüglichen Spanungseigenschaften und guter Schneidhaltigkeit kann erreicht werden, wenn die Hauptschneide als Rundschneide mit einem Radius von kleiner 60 mm ausgebildet ist.A particularly simple and favorable form of cutting insert with excellent cutting properties and good cutting strength can be achieved if the main cutting edge is designed as a circular cutting edge with a radius of less than 60 mm.
Für eine günstige Spanausbildung und zur Erhöhung der Spanleistung bei verbesserter Schneidenstandzeit kann es von Vorteil sein, wenn zumindest im Bereich der Hauptschneide und der Rundung zur Nebenschneide hin die Spanfläche der Schneidplatte parallel zur Schneide eine Spanformstufe aufweist.For a favorable chip formation and to increase the cutting performance with improved cutting tool life, it may be advantageous if at least in the area of the main cutting edge and the rounding to the secondary cutting edge Span surface of the cutting plate parallel to the cutting edge has a chip forming step.
Wenn die Schneidplatte als Wendeschälplatte mit mindestens vier Schneidbereichen ausgeführt ist und eine Einlagen- oder eine Mehrlagen- Hartstoffbeschichtung trägt, ist eine höchstmögliche Wirtschaftlichkeit bei einer Schälbearbeitung von Rundstäben erreichbar.If the cutting plate is designed as a turning peeling plate with at least four cutting areas and carries a deposit or a multi-layer hard coating, the highest possible economy is achievable with a peeling process of round bars.
Nachfolgend wird die Erfindung anhand von jeweils einen Ausführungsweg darstellenden Zeichnungen näher erläutert. Es zeigen:The invention will be explained in more detail with reference to drawings illustrating an embodiment. Show it:
Fig. 1 : Formen (schematisch) von Schälplatten in Draufsicht Fig. 2: Schälplatte in perspektivischer Darstellung Fig. 3: Schälplatte nach der Erfindung in DraufsichtFig. 1: Shapes (schematic) of peeling plates in plan view Fig. 2: peeling plate in perspective view Fig. 3: peeling plate according to the invention in plan view
In Fig. 1 sind, jeweils mit Buchstaben bezeichnet, verschiedene polygonale Wendeschneidplatten zum Drehschälen in Draufsicht schematisch dargestellt. Jede der Schneidplatten nach dem Stand der Technik besitzt für eine Spanabnahme jeweils mindestens eine Hauptschneide und mindestens eine Neben- bzw. Glättschneide, welche Schneiden miteinander einen stumpfen Winkel bilden. Ein Einbau von Wendeschneidplatten erfolgt dabei in Kassetten eines Schneidkopfes derart, dass jeweils eine Neben- bzw. Glättschneide einer Schneidplatte im Wesentlichen parallel zur Achse eines zu schälenden Knüppels bzw. einer Drehachse eines Schälwerkzeuges gerichtet ist und eine Hauptschneide stumpfwinkelig nach außen gegen eine Zufuhrrichtung des Knüppels verläuft.In Fig. 1, each designated by letters, various polygonal indexable inserts for rotary peeling in plan view are shown schematically. Each of the cutting plates according to the prior art has at least one main cutting edge and at least one secondary cutting edge for a chip removal, which edges form an obtuse angle with one another. An installation of indexable inserts takes place in cassettes of a cutting head such that in each case a secondary or smoothing edge of a cutting plate is directed substantially parallel to the axis of a billet to be peeled or a rotation axis of a peeling tool and a main cutting edge outwardly against a feed direction of the billet runs.
Für eine erfindungsgemäße Schneidengeometrie ist nicht eine bestimmte Polygonalform einer Schneidplatte erforderlich, wesentlich ist alleine der Verlauf von Haupt- und Nebenschneide.For a cutting geometry according to the invention, a specific polygonal shape of a cutting insert is not required; the course of the main and secondary cutting edges alone is essential.
Aus Fig. 2 ist in perspektivischer Ansicht eine Schneidplatte 1 für ein Werkzeug zum Drehschälen schematisch entnehmbar. Die Schneidplatte 1 ist als Wendeschneidplatte ausgebildet und weist jeweils eine Hauptschneide 2,2* und eine Nebenschneide 3,3', die vielfach als Glättschneide bezeichnet wird, sowie einen scharfkantigen Verbindungsbereich 4 zwischen Hauptschneide 2 und Nebenschneide 3 auf.From Fig. 2, a cutting plate 1 for a tool for rotary peeling is schematically removed in a perspective view. The cutting plate 1 is formed as an indexable insert and has in each case a main cutting edge 2,2 * and a secondary cutting edge 3,3 ', which is often referred to as a smoothing blade, as well as a sharp-edged connection region 4 between the main cutting edge 2 and secondary cutting edge 3.
Fig. 3 zeigt eine Wendeschneidplatte 1 bzw. Schälplatte 1 nach der Erfindung mit ebenen stirnseitigen Stützflächen. Eine Nebenschneide 3,3' besitzt einen Radius R3 von beispielsweise 1000 mm, wobei die Schneide wesentlich parallel zur Knüppelachse bzw. Drehachse eines Schälkopfes gerichtet ist. Ein Verbindungsbereich 4, 4' von Nebenschneide 3,3' und Hauptschneide 2,2' ist gerundet und besitzt erfindungsgemäß einen Krümmungsradius R4. Eine daran anschließende Hauptschneide 2,2' kann gerade oder vorzugsweise als Rundschneide 2,2' mit einem Radius R2 ausgebildet sein.Fig. 3 shows an indexable insert 1 or peeling plate 1 according to the invention with flat frontal support surfaces. A minor cutting edge 3,3 'has a radius R3 of, for example, 1000 mm, wherein the cutting edge is directed substantially parallel to the stick axis or axis of rotation of a peeling head. A connecting region 4, 4 'of secondary cutting edge 3, 3' and main cutting edge 2, 2 'is rounded and, according to the invention, has a radius of curvature R 4. An adjoining main cutting edge 2, 2 'can be formed straight or preferably as a circular cutting edge 2, 2' with a radius R 2.
Es sei vorsorglich vermerkt, dass eine Hauptschneide 2,2' verschiedene geometrische Linienformen aufweisen kann, jedoch ist es erfindungswesentlich, dass dieselbe einen örtlichen Krümmungsradius von größer 15 mm, jedoch kleiner als 35 mm besitzt.As a precaution, it should be noted that a main cutting edge may have 2,2 'different geometric line shapes, but it is essential to the invention that it has a local radius of curvature greater than 15 mm, but smaller than 35 mm.
Eine Schneidplatte 1 zum Drehschälen kann mit Vorteil planparallele Auflageflächen haben, wobei deren Spanflächenteil zumindest in einem Bereich einer Hauptschneide 2,2', vorzugsweise parallel zur Hauptschneide 2,2', Verbindungsbereich 4,4' und Nebenschneide 3,3* eine Spanformmulde 5,5' aufweist. An insert 1 for rotary peeling can advantageously have coplanar contact surfaces, wherein the chip surface part thereof is at least in a region of a main cutting edge 2,2 ', preferably parallel to the main cutting edge 2,2', connecting region 4,4 'and secondary cutting edge 3,3 * a chip forming trough 5, 5 'has.

Claims

Patentansprüche claims
1. Schneidplatte (1) zum Drehschälen mit in der Draufsicht polygonaler Form, enthaltend mindestens eine Hauptschneide (2) und im stumpfen Winkel zu dieser eine Nebenschneide (3), dadurch gekennzeichnet, dass der Verbindungsbereich (4) zwischen Hauptschneide (2) und Nebenschneide (3) mit der Maßgabe gerundet ist, dass der örtliche Krümmungsradius (R4) der Rundung eine Länge von größer 15 mm, jedoch kleiner als 35 mm, aufweist.1. cutting plate (1) for rotary peeling in plan view polygonal shape, containing at least one main cutting edge (2) and at an obtuse angle to this a secondary cutting edge (3), characterized in that the connecting region (4) between the main cutting edge (2) and secondary cutting edge (3) is rounded with the proviso that the local radius of curvature (R4) of the rounding has a length greater than 15 mm but less than 35 mm.
2. Schneidplatte (1) nach Anspruch 1 , dadurch gekennzeichnet, dass der Verbindungsbereich (4) einen örtlichen Krümmungsradius (R4) der Rundung größer 20 mm, jedoch kleiner 33 mm, aufweist.2. Cutting insert (1) according to claim 1, characterized in that the connecting region (4) has a local radius of curvature (R4) of the rounding greater than 20 mm, but less than 33 mm.
3. Schneidplatte (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Verbindungsbereich (4) zwischen Hauptschneide (2) und Nebenschneide (3) kreisförmig gekrümmt ist.3. cutting plate (1) according to claim 1 or 2, characterized in that the connecting region (4) between the main cutting edge (2) and secondary cutting edge (3) is circularly curved.
4. Schneidplatte (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der jeweilige örtliche Krümmungsradius (R4) der Rundung von der Hauptschneide (2) zur Nebenschneide (3) hin vergrößert ist.4. cutting insert (1) according to claim 1 or 2, characterized in that the respective local radius of curvature (R4) of the rounding of the main cutting edge (2) to the secondary cutting edge (3) is increased towards.
5. Schneidplatte (1) nach Anspruch 4, dadurch gekennzeichnet, dass die Rundung (R4) die Form eines Teiles einer Hyperbel oder einer Parabel besitzt.5. Cutting insert (1) according to claim 4, characterized in that the rounding (R4) has the shape of a part of a hyperbola or a parabola.
6. Schneidplatte (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Nebenschneide (3) als Glättschneide oder Bogenschneide mit einem Radius (R3) von 500 bis 1500 mm, vorzugsweise von 700 bis 1200 mm, ausgebildet ist.6. cutting plate (1) according to one of claims 1 to 5, characterized in that the secondary cutting edge (3) as a smoothing blade or curved blade with a radius (R3) of 500 to 1500 mm, preferably from 700 to 1200 mm, is formed.
7. Schneidplatte (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Hauptschneide (2) als Rundschneide mit einem Radius (R2) von kleiner 60 mm ausgebildet ist.7. cutting plate (1) according to one of claims 1 to 6, characterized in that the main cutting edge (2) is designed as a circular cutting edge with a radius (R2) of less than 60 mm.
8. Schneidplatte (1) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zumindest im Bereich der Hauptschneide (2) und der Rundung (R4) zur Nebenschneide (3) hin die Spanfläche parallel zur Schneide eine Spanformstufe (5) aufweist.8. cutting insert (1) according to one of claims 1 to 7, characterized that at least in the region of the main cutting edge (2) and the rounding (R4) towards the secondary cutting edge (3), the chip surface has a chip forming step (5) parallel to the cutting edge.
9. Schneidplatte (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass diese als Wendeschälplatte mit mindestens vier Schneidbereichen ausgeführt ist und eine Einlagen- oder eine Mehrlagen-Hartstoffbeschichtung trägt. 9. cutting plate (1) according to one of claims 1 to 8, characterized in that it is designed as a turning peeling plate with at least four cutting areas and carries a deposit or a multi-layer hard coating.
EP06704746A 2005-03-24 2006-03-13 Reversible tip cutter for rotary milling Withdrawn EP1861217A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0051305A AT501655B1 (en) 2005-03-24 2005-03-24 CUTTING PLATE FOR SWIVEL CUTTING
PCT/AT2006/000104 WO2006099640A1 (en) 2005-03-24 2006-03-13 Reversible tip cutter for rotary milling

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EP1861217A1 true EP1861217A1 (en) 2007-12-05

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EP06704746A Withdrawn EP1861217A1 (en) 2005-03-24 2006-03-13 Reversible tip cutter for rotary milling

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US (1) US7972092B2 (en)
EP (1) EP1861217A1 (en)
AT (1) AT501655B1 (en)
WO (1) WO2006099640A1 (en)

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EP4331748A1 (en) 2022-09-01 2024-03-06 Dormer Pramet s.r.o Insert for bar-peeling

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EP4331748A1 (en) 2022-09-01 2024-03-06 Dormer Pramet s.r.o Insert for bar-peeling

Also Published As

Publication number Publication date
US7972092B2 (en) 2011-07-05
US20080159820A1 (en) 2008-07-03
WO2006099640A1 (en) 2006-09-28
AT501655A1 (en) 2006-10-15
AT501655B1 (en) 2007-10-15

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