EP1912757A1 - Cutting insert - Google Patents

Cutting insert

Info

Publication number
EP1912757A1
EP1912757A1 EP06761802A EP06761802A EP1912757A1 EP 1912757 A1 EP1912757 A1 EP 1912757A1 EP 06761802 A EP06761802 A EP 06761802A EP 06761802 A EP06761802 A EP 06761802A EP 1912757 A1 EP1912757 A1 EP 1912757A1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting insert
insert according
cutting edge
angle
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Withdrawn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
EP06761802A
Other languages
German (de)
French (fr)
Inventor
Markus Heinloth
Jürgen ZASTROZYNSKI
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.)
Kennametal Widia Produktions GmbH and Co KG
Original Assignee
Kennametal Widia Produktions 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 Kennametal Widia Produktions GmbH and Co KG filed Critical Kennametal Widia Produktions GmbH and Co KG
Publication of EP1912757A1 publication Critical patent/EP1912757A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/06—Milling crankshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/36—Other features of cutting inserts not covered by B23B2200/04 - B23B2200/32
    • B23B2200/3645—Lands, i.e. the outer peripheral section of the rake face
    • B23B2200/3663—Lands, i.e. the outer peripheral section of the rake face having negative cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/08—Rake or top surfaces
    • B23C2200/085—Rake or top surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/203—Curved cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/28—Angles
    • B23C2200/286—Positive cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2215/00—Details of workpieces
    • B23C2215/20—Crankshafts
    • 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
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1934—Rotary cutting tool including holder [i.e., head] having seat for inserted tool with separate means to fasten tool to holder
    • Y10T407/1936—Apertured tool
    • 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
    • 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 insert, in particular for crankshaft machining, with two mutually parallel planar base surfaces, each penetrated by a bore for receiving a clamping screw and merge at their shorter edges in rounded end faces, which are each bounded laterally by cutting edges.
  • Such cutting inserts are used for example in the external milling of crankshafts, in particular for the processing of the undercut on the pin.
  • EP 0 830 228 B1 describes a disk-shaped external milling cutter which is driven in such a way that the machining is carried out at cutting speeds of more than 160 m / min. For this purpose, both the crankshaft and the external milling cutter are rotated.
  • tangentially clamped cutting inserts are used, whereas for the processing of the cheeks, an oil collar and a undercut radially clamped cutting inserts are used.
  • Such cutting inserts have the above-mentioned construction, each with rounded cutting edges, which have an at least substantially uniform curvature over an angular extent of about 135 ° and then pass on to a linear section before the cutting edge merges via a convex curvature in the opposite base.
  • rotary-Räum- or rotary-rotary-Räum-method For machining crankshafts and turning tools which are used in so-called rotary-Räum- or rotary-rotary-Räum-method.
  • rotary clearing a linear rotary broaching tool is delivered in the radial direction to the rotating tool to be machined.
  • a plurality of successive cutting inserts are arranged on a pitch circle circumference of a disc-shaped tool carrier, which gradually increase gradually along a first portion of the disc circumference.
  • This tool is along a partial arc in the radial direction on the rotating workpiece pivoted, as described in principle in EP O 313 644 B1 or EP 0 286 771 A1.
  • two geometrically different types of cutting insert are used for the journal processing and the production of the undercut.
  • the so-called internal milling is also known, which also works with a disc-shaped milling tool, but with the proviso that the cutting inserts are arranged on the inner shell side of an annular disc.
  • the tool costs consist of several components. These include, in particular, the tool costs, which are determined not only by the pure production costs but also by the service lives. Furthermore, the processing times and the costs for tool conversion are included. So-called indexable inserts have several usable cutting edges, but their number is structurally limited. Thus, the number of usable cutting edges in an aforementioned cutting insert is limited to four.
  • a cutting insert according to claim 1 characterized in that at least one pair of the cutting edges is step-shaped and has two convex and an intermediate concave portion, wherein the outer convex portion extends over an angular extent of 180 °.
  • Such a cutting edge shape can be stepped contours such as an oil collar of a crankshaft cut, at the same time a cheek, the oil collar and the journal bearing corner or a undercut can be formed. Further developments of the invention are described in the subclaims.
  • two pairs of the cutting edges are preferably formed in steps, so that the cutting insert is rotationally symmetrical about a transverse axis when rotated by 180 °. Overall, this results in four congruent cutting edges, which can be used successively.
  • a chamfer is provided along the cutting edge, which is preferably arranged at a (negative) chamfer angle of -15 ° and / or with a chamfer width of 0.1 to 0.2 mm.
  • the rake angle used in particular the rake angle adjoining the chamfer, is 0 ° to 20 °, preferably it is selected to be positive at 10 °.
  • the radius of curvature of the cutting edge can be chosen so that this cutting edge in an operation a step-shaped contour is cut in the desired final dimensions.
  • this is the radius of curvature in the concave portion of the cutting edge with 1, 5 + 0.1 mm and in the convex portion of the cutting edge on one side with 1, 5 ⁇ 0.1 mm and on the other side with 1, 4 + 0.1 mm selected.
  • other cutting edge radii of curvature can be used.
  • a cutting insert configuration may be selected in which the common tangent to the convex portions forms an angle of 35 ° ⁇ 5 ° with the base.
  • the cutting edge region reaching over 180 ° passes over a linear cutting edge piece into the adjacent base surface, this cutting edge piece forming an angle of ⁇ 5 ° with the base surface.
  • the convex and the concave cutting edge portion inclined by an angle of up to 20 °, preferably of 10 ° to the longitudinal central axis of the cutting insert.
  • FIG. 1 is a plan view of a cutting insert according to the invention
  • Fig. 3 is an enlarged view of a cutting edge contour
  • Fig. 4 is a partial sectional view in the region of a cutting edge.
  • the cutting insert shown in the figures has two mutually parallel planar base surfaces 10, 11, which are penetrated by a through hole 12. This bore serves to receive a clamping screw, by means of which the cutting insert is attached radially or laterally to a side milling cutter.
  • the base surfaces 10, 11 go over at their shorter edges in rounded end faces, which are bounded laterally by cutting edges.
  • the cutting edges are step-shaped and consist of two convex cutting edge sections 13 and 14 and an intermediate concave cutting edge section 15.
  • the radii R 1 and R 3 for the convex cutting edge sections can be the same size, z_ B. 1, 5 mm or different. The same applies to the radius R 2 of the concave cutting edge section.
  • the cutting insert has a chamfer 16 which extends along the cutting edge portions 13-15. This chamfer is inclined at a chamfer angle a of -15 °.
  • the rake angle b also resulting from FIG. 4 is + 10 °.
  • the chamfer width is for example 0.15 mm.
  • the common tangent 19 of the convex cutting edge portions 13 and 14 with the base 10 and 11 forms an angle of about 35 °.
  • a tangent 20 which is placed on the outgoing portion of the cutting edge portion 13 at the transition to the respective base. This tangent 20 forms with the base an angle which is about 4 °.
  • the cutting edges 13 to 15 are inclined relative to the longitudinal central axis 21 of the cutting insert by an inclination angle c, which is preferably up to 10 °.
  • the cutting insert has a total of four actively usable cutting edges, with which in particular stepped oil band contours can be processed, either the expiring sections 22 or 23 depending on the clamping direction of the cutting insert for the production of the cheek contour.
  • the prescribed cutting insert may have on the chip surface chip forming and clamping elements in the form of subsidence or elevations.
  • the cutting insert consists of a hard metal or a cermet material, which may optionally also be coated. Typical coating materials are carbides, nitrides, oxides of the IVa to VLa metals as well as aluminum oxide, but also diamond coatings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

The invention relates to a cutting insert, in particular for machining crankshafts, having two base surfaces (10, 11) which are arranged parallel to one another and through which a respective hole (12) passes for receiving a clamping screw and which merge at their shorter edges into rounded end faces which are each defined laterally by cutting edges. According to the invention, at least one pair of the cutting edges is of stepped design and has two convex sections (13, 14) and a concave section (15) lying in between, wherein the outer convex section (13) extends over an angle of 180°.

Description

Schneideinsatzcutting insert
Die Erfindung betrifft einen Schneideinsatz, insbesondere für die Kurbelwellenbearbeitung, mit zwei parallel zueinander angeordneten ebenen Grundflächen, die jeweils von einer Bohrung zur Aufnahme einer Spannschraube durchgriffen und die an ihren kürzeren Kanten in gerundete Stirnflächen übergehen, die jeweils seitlich durch Schneidkanten begrenzt sind.The invention relates to a cutting insert, in particular for crankshaft machining, with two mutually parallel planar base surfaces, each penetrated by a bore for receiving a clamping screw and merge at their shorter edges in rounded end faces, which are each bounded laterally by cutting edges.
Solche Schneideinsätze werden beispielsweise beim Außenfräsen von Kurbelwellen, insbesondere für die Bearbeitung des Unterstiches am Zapfen verwendet. In der EP 0 830 228 B1 wird ein scheibenförmiger Außenfräser beschrieben, der derart angetrieben wird, dass die spanende Bearbeitung mit Schnittgeschwindigkeiten von über 160 m/min durchgeführt wird. Hierzu werden sowohl Kurbelwelle als auch der Außenfräser rotierend bewegt. Für die Bearbeitung der zylinderförmigen Mantelflächen des rotierend bewegten Werkstückes, also beispielsweise der Zapfenkontur, werden tangential eingespannte Schneideinsätze verwendet, wohingegen für die Bearbeitung der Wangen, eines Ölbundes sowie eines Unterstiches radial eingespannte Schneideinsätze verwendet werden. Solche Schneideinsätze besitzen den eingangs angegebenen Aufbau mit jeweils gerundeten Schneidkanten, die über ein Winkelmaß von ca. 135° eine zumindest im wesentlichen gleichmäßige Krümmung aufweisen und hieran im Anschluss an einen Linearabschnitt übergehen, bevor die Schneidkante über eine konvexe Krümmung in die gegenüberliegende Grundfläche übergeht.Such cutting inserts are used for example in the external milling of crankshafts, in particular for the processing of the undercut on the pin. EP 0 830 228 B1 describes a disk-shaped external milling cutter which is driven in such a way that the machining is carried out at cutting speeds of more than 160 m / min. For this purpose, both the crankshaft and the external milling cutter are rotated. For the processing of the cylindrical lateral surfaces of the rotating moving workpiece, so for example the pin contour, tangentially clamped cutting inserts are used, whereas for the processing of the cheeks, an oil collar and a undercut radially clamped cutting inserts are used. Such cutting inserts have the above-mentioned construction, each with rounded cutting edges, which have an at least substantially uniform curvature over an angular extent of about 135 ° and then pass on to a linear section before the cutting edge merges via a convex curvature in the opposite base.
Zur Bearbeitung von Kurbelwellen sind auch Drehwerkzeuge bekannt, die in sogenannten Dreh-Räum- oder Dreh-Dreh-Räum-Verfahren verwendet werden. Beim Dreh-Räumen wird ein lineares Dreh-Räum-Werkzeug in radialer Richtung auf das zu bearbeitende rotierende Werkzeug zugestellt. Beim Dreh-Dreh-Räumen sind auf einem Teilkreisumfang eines scheibenförmigen Werkzeugträgers mehrere aufeinander folgende Schneideinsätze angeordnet, die schrittweise kontinuierlich längs eines ersten Abschnittes des Scheibenumfanges zunehmen. Dieses Werkzeug wird entlang eines Teilkreisbogens in radialer Richtung auf das rotierend bewegte Werkstück eingeschwenkt, wie dies prinzipiell in der EP O 313 644 B1 oder der EP 0 286 771 A1 beschrieben wird. Auch auf diesen leistenförmigen oder scheibenförmigen Werkzeugen werden zwei geometrisch unterschiedliche Schneideinsatztypen für die Zapfenbearbeitung und die Fertigung des Unterstiches verwendet.For machining crankshafts and turning tools are known which are used in so-called rotary-Räum- or rotary-rotary-Räum-method. During rotary clearing a linear rotary broaching tool is delivered in the radial direction to the rotating tool to be machined. When turning-rotating-clearing a plurality of successive cutting inserts are arranged on a pitch circle circumference of a disc-shaped tool carrier, which gradually increase gradually along a first portion of the disc circumference. This tool is along a partial arc in the radial direction on the rotating workpiece pivoted, as described in principle in EP O 313 644 B1 or EP 0 286 771 A1. Also on these strip-shaped or disc-shaped tools two geometrically different types of cutting insert are used for the journal processing and the production of the undercut.
Neben den vorbeschriebenen Verfahren ist auch das sogenannte Innenfräsen bekannt, bei dem ebenfalls mit einem scheibenförmigen Fräswerkzeug gearbeitet wird, allerdings mit der Maßgabe, dass die Schneideinsätze an der Innenmantelseite einer Ringscheibe angeordnet sind.In addition to the above-described method, the so-called internal milling is also known, which also works with a disc-shaped milling tool, but with the proviso that the cutting inserts are arranged on the inner shell side of an annular disc.
Die Werkzeugkosten setzen sich aus mehreren Komponenten zusammen. Hierzu gehören insbesondere die Werkzeugkosten, die neben den reinen Herstellkosten auch durch die Standzeiten bestimmt werden. Weiterhin gehen die Bearbeitungszeiten sowie die Kosten für die Werkzeugumrüstung ein. Sogenannte Wendeschneidplatten besitzen mehrere nutzbare Schneiden, deren Anzahl jedoch konstruktiv begrenzt ist. So ist die Anzahl der nutzbaren Schneidkanten bei einem eingangs genannten Schneideinsatz auf vier begrenzt.The tool costs consist of several components. These include, in particular, the tool costs, which are determined not only by the pure production costs but also by the service lives. Furthermore, the processing times and the costs for tool conversion are included. So-called indexable inserts have several usable cutting edges, but their number is structurally limited. Thus, the number of usable cutting edges in an aforementioned cutting insert is limited to four.
Es ist Aufgabe der vorliegenden Erfindung, diesen Schneideinsatz derart weiterzubilden, dass seine Schneidkantenkontur erweiterte Bearbeitungsmöglichkeiten ermöglicht.It is an object of the present invention to further develop this cutting insert in such a way that its cutting edge contour enables extended processing possibilities.
Diese Aufgabe wird durch einen Schneideinsatz nach Anspruch 1 dadurch gelöst, dass mindestens ein Paar der Schneidkanten stufenförmig ausgebildet ist und zwei konvexe sowie einen dazwischen liegenden konkaven Abschnitt aufweist, wobei der äußere konvexe Abschnitt über ein Winkelmaß von 180° reicht.This object is achieved by a cutting insert according to claim 1, characterized in that at least one pair of the cutting edges is step-shaped and has two convex and an intermediate concave portion, wherein the outer convex portion extends over an angular extent of 180 °.
Durch eine solche Schneidkantenform lassen sich stufenförmige Konturen wie beispielsweise ein Ölbund einer Kurbelwelle schneiden, wobei gleichzeitig eine Wange, der Ölbund sowie auch die Zapfenlagerecke bzw. ein Unterstich ausgeformt werden können. Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.By such a cutting edge shape can be stepped contours such as an oil collar of a crankshaft cut, at the same time a cheek, the oil collar and the journal bearing corner or a undercut can be formed. Further developments of the invention are described in the subclaims.
So sind vorzugsweise jeweils zwei Paare der Schneidkanten stufenförmig ausgebildet, so dass der Schneideinsatz bei Drehung um 180° um eine Querachse rotationssymmetrisch ist. Insgesamt ergeben sich somit vier kongruente Schneidkanten, die nacheinander nutzbar sind.Thus, two pairs of the cutting edges are preferably formed in steps, so that the cutting insert is rotationally symmetrical about a transverse axis when rotated by 180 °. Overall, this results in four congruent cutting edges, which can be used successively.
Zur Schneidkantenstabilisierung ist entlang der Schneidkante eine Fase vorgesehen, die vorzugsweise unter einem (negativen) Fasenwinkel von -15° und/oder mit einer Fasenbreite von 0,1 bis 0,2 mm angeordnet ist.For cutting edge stabilization, a chamfer is provided along the cutting edge, which is preferably arranged at a (negative) chamfer angle of -15 ° and / or with a chamfer width of 0.1 to 0.2 mm.
Der verwendete Spanwinkel, insbesondere der sich an die Fase anschließende Spanwinkel liegt bei 0° bis 20°, vorzugsweise wird er mit 10° positiv gewählt.The rake angle used, in particular the rake angle adjoining the chamfer, is 0 ° to 20 °, preferably it is selected to be positive at 10 °.
Zur besseren Abstützung des Schneideinsatzes im Plattensitz besitzt der Schneideinsatz im mittleren Bereich jeweils senkrecht zu den ebenen Grundflächen ebene Seitenflächen.For better support of the cutting insert in the insert seat of the cutting insert has in the central region in each case perpendicular to the flat surfaces flat side surfaces.
Wie bereits eingangs erwähnt, kann der Krümmungsradius der Schneidkante so gewählt werden, dass mit dieser Schneidkante in einer Operation eine stufenförmige Kontur in dem gewünschten Endmaß geschnitten wird. Insbesondere für die Kurbelwellenbearbeitung wird hierzu der Krümmungsradius im konkaven Bereich der Schneidkante mit 1 ,5 + 0,1 mm und im konvexen Bereich der Schneidkante auf einer Seite mit 1 ,5 ± 0,1 mm und auf der anderen Seite mit 1 ,4 + 0,1 mm gewählt. Erfindungsgemäß lassen sich jedoch auch andere Schneidkanten-Krümmungsradien verwenden.As already mentioned, the radius of curvature of the cutting edge can be chosen so that this cutting edge in an operation a step-shaped contour is cut in the desired final dimensions. In particular, for crankshaft machining this is the radius of curvature in the concave portion of the cutting edge with 1, 5 + 0.1 mm and in the convex portion of the cutting edge on one side with 1, 5 ± 0.1 mm and on the other side with 1, 4 + 0.1 mm selected. According to the invention, however, other cutting edge radii of curvature can be used.
Ebenso kann vorzugsweise eine Schneideinsatzausgestaltung gewählt werden, bei der die an die konvexen Bereiche gelegte gemeinsame Tangente mit der Grundfläche einen Winkel von 35° ± 5° bildet. Nach einer weiteren Ausbildung der Erfindung geht der über 180° reichende Schneidkantenbereich über ein lineares Schneidkantenstück in die anliegende Grundfläche über, wobei dieses Schneidkantenstück mit der Grundfläche einen Winkel < 5° bildet.Also, preferably, a cutting insert configuration may be selected in which the common tangent to the convex portions forms an angle of 35 ° ± 5 ° with the base. According to a further embodiment of the invention, the cutting edge region reaching over 180 ° passes over a linear cutting edge piece into the adjacent base surface, this cutting edge piece forming an angle of <5 ° with the base surface.
Schließlich sind nach einer vorzugsweisen Ausgestaltung der Erfindung die konvexen und die konkaven Schneidkantenabschnitt um einen Winkel von bis zu 20°, vorzugsweise von 10° zur Längsmittelachse des Schneideinsatzes geneigt.Finally, according to a preferred embodiment of the invention, the convex and the concave cutting edge portion inclined by an angle of up to 20 °, preferably of 10 ° to the longitudinal central axis of the cutting insert.
Weitere Ausführungsvarianten sowie Vorteile des Schneideinsatzes ergeben sich aus den Zeichnungen. Es zeigen:Other variants and advantages of the cutting insert will become apparent from the drawings. Show it:
Fig. 1 eine Draufsicht auf einen erfindungsgemäßen Schneideinsatz,1 is a plan view of a cutting insert according to the invention,
Fig. 2 eine Seitenansicht (mit einer Draufsicht auf die Schneidkantenkonturen),2 is a side view (with a plan view of the cutting edge contours),
Fig. 3 eine vergrößerte Darstellung einer Schneidkantenkontur undFig. 3 is an enlarged view of a cutting edge contour and
Fig. 4 eine Teilschnittansicht im Bereich einer Schneidkante.Fig. 4 is a partial sectional view in the region of a cutting edge.
Der in den Figuren dargestellte Schneideinsatz besitzt zwei parallel zueinander angeordnete ebene Grundflächen 10, 11, die von einer durchgehenden Bohrung 12 durchgriffen werden. Diese Bohrung dient zur Aufnahme einer Spannschraube, mittels der der Schneideinsatz radial bzw. lateral an einem Scheibenfräser befestigt wird. Die Grundflächen 10, 11 gehen an ihren kürzeren kanten in gerundete Stirnflächen über, die jeweils seitlich durch Schneidkanten begrenzt sind. Die Schneidkanten sind stufenförmig ausgebildet und bestehen aus zwei konvexen Schneidkantenabschnitten 13 und 14 sowie einem dazwischen liegenden konkaven Schneidkantenabschnitt 15. Die Radien R1 und R3 für die konvexen Schneidkantensabschnitte können gleich groß, z_ B. 1 ,5 mm oder verschieden sein. Entsprechendes gilt auch für den Radius R2 des konkaven Schneidkantenabschnittes. Der Schneideinsatz besitzt eine Fase 16, die sich entlang der Schneidkantenabschnitte 13 bis 15 erstreckt. Diese Fase ist unter einem Fasenwinkel a von -15° geneigt. Der sich ebenfalls aus Fig. 4 ergebende Spanwinkel b beträgt +10°. Die Fasenbreite liegt beispielsweise bei 0,15 mm.The cutting insert shown in the figures has two mutually parallel planar base surfaces 10, 11, which are penetrated by a through hole 12. This bore serves to receive a clamping screw, by means of which the cutting insert is attached radially or laterally to a side milling cutter. The base surfaces 10, 11 go over at their shorter edges in rounded end faces, which are bounded laterally by cutting edges. The cutting edges are step-shaped and consist of two convex cutting edge sections 13 and 14 and an intermediate concave cutting edge section 15. The radii R 1 and R 3 for the convex cutting edge sections can be the same size, z_ B. 1, 5 mm or different. The same applies to the radius R 2 of the concave cutting edge section. The cutting insert has a chamfer 16 which extends along the cutting edge portions 13-15. This chamfer is inclined at a chamfer angle a of -15 °. The rake angle b also resulting from FIG. 4 is + 10 °. The chamfer width is for example 0.15 mm.
Im mittleren Bereich jeweils senkrecht zu den ebenen Grundflächen 10 und 11 sind ebene Seitenflächen 17, 18 vorgesehen.In the central region in each case perpendicular to the flat base surfaces 10 and 11 are flat side surfaces 17, 18 are provided.
In der in den Figuren dargestellten Sonderform bildet die gemeinsame Tangente 19 der konvexen Schneidkantenabschnitte 13 und 14 mit der Grundfläche 10 bzw. 11 einen Winkel von etwa 35°. Aus Fig. 3 ersichtlich ist ferner eine Tangente 20, die an den auslaufenden Abschnitt des Schneidkantenabschnittes 13 beim Übergang zu der jeweiligen Grundfläche gelegt ist. Diese Tangente 20 bildet mit der Grundfläche einen Winkel, der ca. 4° beträgt.In the special form shown in the figures, the common tangent 19 of the convex cutting edge portions 13 and 14 with the base 10 and 11 forms an angle of about 35 °. From Fig. 3 it can be seen also a tangent 20 which is placed on the outgoing portion of the cutting edge portion 13 at the transition to the respective base. This tangent 20 forms with the base an angle which is about 4 °.
Entsprechend der Abbildung in Fig. 1 sind die Schneidkanten 13 bis 15 gegenüber der Längsmittelachse 21 des Schneideinsatzes um einen Neigungswinkel c geneigt, der vorzugsweise bis zu 10° beträgt.According to the illustration in Fig. 1, the cutting edges 13 to 15 are inclined relative to the longitudinal central axis 21 of the cutting insert by an inclination angle c, which is preferably up to 10 °.
Der Schneideinsatz besitzt insgesamt vier aktiv nutzbare Schneidkanten, mit denen insbesondere stufenförmige Ölbund-Konturen bearbeitet werden können, wobei entweder die auslaufenden Abschnitte 22 oder 23 je nach Einspannrichtung des Schneideinsatzes für die Fertigung der Wangenkontur dienen.The cutting insert has a total of four actively usable cutting edges, with which in particular stepped oil band contours can be processed, either the expiring sections 22 or 23 depending on the clamping direction of the cutting insert for the production of the cheek contour.
Der vorgeschriebene Schneideinsatz kann auf der Spanfläche Spanform- und Spanlenkungselemente in Form von Absenkungen oder Erhebungen aufweisen. Der Schneideinsatz besteht aus einem Hartmetall oder einem Cermet-Werkstoff, der gegebenenfalls auch beschichtet sein kann. Typische Beschichtungsmaterialien sind Carbide, Nitride, Oxide der IVa bis Vla-Metalle sowie Aluminiumoxid, aber auch Dia- mantbeschichtungen. The prescribed cutting insert may have on the chip surface chip forming and clamping elements in the form of subsidence or elevations. The cutting insert consists of a hard metal or a cermet material, which may optionally also be coated. Typical coating materials are carbides, nitrides, oxides of the IVa to VLa metals as well as aluminum oxide, but also diamond coatings.

Claims

Patentansprüche claims
1. Schneideinsatz, insbesondere für die Kurbelwellenbearbeitung, mit zwei parallel zueinander angeordneten ebenen Grundflächen (10, 11), die jeweils von einer Bohrung (12) zur Aufnahme einer Spannschraube durchgriffen werden und die an ihren kürzeren Kanten in gerundete Stirnflächen übergehen, die jeweils seitlich durch Schneidkanten begrenzt sind, d a d u r c h g e k e n n z e i c h n e t, d a s s mindestens ein Paar der Schneidkanten stufenförmig ausgebildet ist und zwei konvexe (13, 14) sowie einen dazwischen liegenden konkaven Abschnitt (15) aufweist, wobei der äußere konvexe Abschnitt (13) über ein Winkelmaß von 180° reicht.1. cutting insert, in particular for crankshaft machining, with two mutually parallel planar base surfaces (10, 11) which are each penetrated by a bore (12) for receiving a clamping screw and merge at their shorter edges in rounded end faces, each side are delimited by cutting edges, characterized in that at least a pair of the cutting edges are step-shaped and have two convex (13, 14) and an intermediate concave portion (15), wherein the outer convex portion (13) extends over an angular extent of 180 ° ,
2. Schneideinsatz nach Anspruch 1 , dadurch gekennzeichnet, dass jeweils zwei Paare der Schneidkanten (13 bis 15) stufenförmig ausgebildet sind, so dass der Schneideinsatz bei Drehung um 180° um eine Querachse rotationssymmetrisch ist.2. Cutting insert according to claim 1, characterized in that in each case two pairs of the cutting edges (13 to 15) are step-shaped, so that the cutting insert is rotationally symmetrical about a transverse axis when rotated by 180 °.
3. Schneideinsatz nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass entlang der Schneidkante eine Fase (16), vorzugsweise unter einem negativen Fasenwinkel (a) von -15° und/oder mit einer Fasenbreite von 0,1 bis 0,2 mm angeordnet ist.3. Cutting insert according to claim 1 or 2, characterized in that arranged along the cutting edge a chamfer (16), preferably at a negative chamfer angle (a) of -15 ° and / or with a chamfer width of 0.1 to 0.2 mm is.
4. Schneideinsatz nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Spanwinkel (b) entlang der Schneidkanten (13, 14, 15, 22, 23) 0° bis 20°, vorzugsweise 10°, beträgt.4. Cutting insert according to one of claims 1 to 3, characterized in that the rake angle (b) along the cutting edges (13, 14, 15, 22, 23) 0 ° to 20 °, preferably 10 °.
5. Schneideinsatz nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass im mittleren Bereich jeweils senkrecht zu den ebenen Grundflächen (10, 11) ebene Seitenflächen (17, 18) ausgebildet sind. 5. Cutting insert according to one of claims 1 to 4, characterized in that in the central region in each case perpendicular to the flat base surfaces (10, 11) flat side surfaces (17, 18) are formed.
6. Schneideinsatz nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Krümmungsradius (R2) im konkaven Bereich (15) der Schneidkante 1 ,5 + 0,1 mm und im konvexen Bereich (13, 14) der Schneidkante auf einer Seite 1 ,5 ± 0,1 mm und auf der anderen Seite6. Cutting insert according to one of claims 1 to 5, characterized in that the radius of curvature (R 2 ) in the concave portion (15) of the cutting edge 1, 5 + 0.1 mm and in the convex portion (13, 14) of the cutting edge on a Side 1, 5 ± 0.1 mm and on the other side
1 ,4 + 0,1 mm beträgt.1, 4 + 0.1 mm.
7. Schneideinsatz nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die an die konvexen Bereiche (13, 14) gelegte gemeinsame Tangente (19) mit der Grundfläche (10, 11) einen Winkel von 35° + 5° bildet.7. Cutting insert according to one of claims 1 to 6, characterized in that the convex portions (13, 14) set common tangent (19) with the base (10, 11) forms an angle of 35 ° + 5 °.
8. Schneideinsatz nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der über 180° reichende Schneidkantenbereich über ein im wesentlichen lineares Schneidkantenstück (22) mit der Grundfläche (10, 11) einen Winkel < 5° .bildet.8. Cutting insert according to one of claims 1 to 7, characterized in that the over 180 ° reaching cutting edge region via an essentially linear cutting edge piece (22) with the base (10, 11) an angle <5 ° .bildet.
9. Schneideinsatz nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die konkaven und die konvexen Schneidkantenabschnitte (13, 14, 15) um einen Winkel (a) von bis zu 20°, vorzugsweise 10° zur Längsmittelachse (21) des Schneideinsatzes geneigt sind. 9. Cutting insert according to one of claims 1 to 8, characterized in that the concave and the convex cutting edge portions (13, 14, 15) by an angle (a) of up to 20 °, preferably 10 ° to the longitudinal central axis (21) of the cutting insert are inclined.
EP06761802A 2005-08-08 2006-07-14 Cutting insert Withdrawn EP1912757A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202005012615U DE202005012615U1 (en) 2005-08-08 2005-08-08 Cutting tool for machining crankshaft, has two parallel flat bases which at its short edges are changed to rounded end faces that are limited by cutting edges including two convex edge sections, in which one has specific angular dimension
PCT/DE2006/001222 WO2007016890A1 (en) 2005-08-08 2006-07-14 Cutting insert

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EP1912757A1 true EP1912757A1 (en) 2008-04-23

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US (1) US8858132B2 (en)
EP (1) EP1912757A1 (en)
JP (1) JP5541862B2 (en)
KR (1) KR20080023761A (en)
CN (3) CN104001982A (en)
BR (1) BRPI0614369A2 (en)
CA (1) CA2617619A1 (en)
DE (1) DE202005012615U1 (en)
MX (1) MX2008001805A (en)
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WO (1) WO2007016890A1 (en)

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WO2007016890A8 (en) 2008-01-31
JP2009504417A (en) 2009-02-05
WO2007016890A1 (en) 2007-02-15
US20090232609A1 (en) 2009-09-17
CN104001982A (en) 2014-08-27
US8858132B2 (en) 2014-10-14
CN102974881A (en) 2013-03-20
RU2008103667A (en) 2009-09-20
RU2398661C2 (en) 2010-09-10
DE202005012615U1 (en) 2005-10-27
MX2008001805A (en) 2008-04-09
CN101227993A (en) 2008-07-23
JP5541862B2 (en) 2014-07-09
CA2617619A1 (en) 2007-02-15
BRPI0614369A2 (en) 2011-03-22
KR20080023761A (en) 2008-03-14

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