EP0132259B1 - Saw blade - Google Patents

Saw blade Download PDF

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Publication number
EP0132259B1
EP0132259B1 EP84900378A EP84900378A EP0132259B1 EP 0132259 B1 EP0132259 B1 EP 0132259B1 EP 84900378 A EP84900378 A EP 84900378A EP 84900378 A EP84900378 A EP 84900378A EP 0132259 B1 EP0132259 B1 EP 0132259B1
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EP
European Patent Office
Prior art keywords
tooth
saw blade
hard metal
teeth
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.)
Expired
Application number
EP84900378A
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German (de)
French (fr)
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EP0132259A1 (en
Inventor
Herbert Erhardt
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TECNO ZUERICH AG
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Tecno Zuerich AG
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Publication of EP0132259A1 publication Critical patent/EP0132259A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/02—Structural design of saw blades or saw teeth
    • 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
    • B23D61/02—Circular saw blades
    • B23D61/04—Circular saw blades with inserted saw teeth the teeth being individually inserted
    • 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
    • B23D61/14—Straight saw blades; Strap saw blades with inserted saw teeth, i.e. the teeth being individually inserted
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/9326—Plural separable sections
    • Y10T83/9329—Tooth separable from blade
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/9367—Teeth having cutting edge perpendicular to blade surface

Definitions

  • the invention relates to a circular saw blade for the machining of wood, the teeth of which are provided with a cast or sintered hard metal insert, the teeth each having a cutting edge and a rounded tooth base, the tooth face - starting from the tooth tip - a cutting part with a cutting angle (8) of less than 60 ° but more than 40 °, the adjoining arch part is undercut and merges into the tooth base.
  • DE-C-815840 shows a wood saw blade with interchangeable teeth.
  • the teeth with their shanks are each designed as a spring ring with a cutting edge, which is inserted into a circular opening of the saw blade. Such attachment of cutting tips has proven to be insufficient for highly stressed circular saw blades.
  • the object of the present invention is to provide a circular saw blade with hard metal inserts with which a cutting performance which is substantially higher than that of conventional saw blades is possible, the hard metal inserts being simple to manufacture and securely attachable to the saw blade body.
  • a hard metal insert is followed by a curved part of the arch, which passes seamlessly into the circular tooth base and forms part of the undercut, and wherein the tooth base and the curved part of the hard metal insert are circular, have a common circle center, the hard metal Inserts essentially each have the shape of a parallelogram, the short side of the parallelogram facing away from the cutting tip forming the concave arc part of the hard metal insert and the longer side of the parallelogram forming the tooth face, and a straight line applied to the tooth face from the undercut arc part of a circular section separates, whose central angle ( ⁇ ) is 60-110 °.
  • the figure shows a section of a circular saw blade in which the teeth are fitted with hard metal inserts.
  • the circular saw blade according to the figure has a diameter in the order of about 50-1 500 mm and is preferably used for processing hard or softwood.
  • the teeth of such a circular saw blade 1 have a tooth shape that differs from the conventional design.
  • the tooth face 2 of each tooth merges into an adjoining arcuate part 3, which continues into a rounded tooth base 4 and then merges into a tooth back 5, a tooth gap being formed.
  • the arcuate part 3 is undercut compared to an imaginary straight continuation F of the cutting part 2 and forms together with the tooth base 5 a circular arc part 3 with the radius r.
  • the center m of this radius 3 is at least approximately on a radius R applied to the tooth tip 6 with respect to the center of the circular saw blade.
  • the length L of this tooth face 2 corresponds to approximately 2/3 of the tooth or cutting width.
  • the length L of the cutting part 2 is increased by regrinding and can then correspond approximately to twice the tooth thickness.
  • the cutting width for circular saw diameters of 200 is approximately 3 mm, for 500 mm diameter approximately 4 mm and is graded accordingly for intermediate sizes.
  • the tooth depth H is approximately in the order of half the tooth pitch t.
  • the central angle y of the chord of the curved part 3a, 3 formed by the straight line F, which separates a circular section, is 60-110 °, preferably approximately 80 °.
  • the teeth are equipped with hard metal, sintered, soldered hard metal inserts 12 being used. These are essentially in the form of a parallelogram, but one short side is concave.
  • the length L 1 measured over the tips is approximately 9-14 mm and the distance measured between the long parallel surfaces is approximately 1/4 of the length.
  • the length L of the tooth face is about 1/3 to 3/5 of the tooth depth H. For circular saw diameters of 50-150 mm, the tooth depth is about 10-12 mm, above that about 12-22 mm as a rule.
  • the center point m of the arcuate part 3a, 3 forming a circular section lies approximately on a radius R 1 ' which is placed from the center of the circular saw at the inner end of the cutting part. This corresponds to point 16 at the transition between the straight tooth face 2 and the curved arch part 3a of the hard metal insert.
  • the radius r corresponds to approximately 1/4 of the tooth depth H.
  • the depth h of the undercut of the curved part 3a and 3 is approximately of the order of 3/8 r.
  • the undercut 3a and 3 can also be expressed as the size of the central angle ⁇ .
  • the central angle -y of the chord, which cuts the straight line F out of the curved part 3a, 3, is 60-110 °, preferably about 90 °.
  • the circular arc part 3a falling on the area of the hard metal insert 12 corresponds approximately to half the central angle ⁇ and thus forms part of the undercut.
  • the clearance angle a is 5-15 °
  • the rake angle ⁇ is approximately 38-42 °
  • the wedge angle ⁇ is 30-55 °, preferably approximately 35-47 °. If the clearance angle a is a minimum of 5 °, the wedge angle ⁇ should be a minimum of 40 ° and a maximum of 55 °; if, on the other hand, the clearance angle ⁇ is a maximum of 15 °, the wedge angle ⁇ should be a minimum of 30 ° and a maximum of 45 °. Intermediate sizes are graded accordingly.
  • a straight line applied to the back 15 meets the point 16 of the next tooth approximately at the transition between the tooth face 2 and the arch part 3.
  • the tooth gap edge 5 connected to the back 15 forms an acute angle to the straight line F, so that the separated chips have sufficient space, in order to be able to emerge freely from the chip space widening outwards.
  • the arch part 3 and the arched tooth base 4 together form more than a semicircle, preferably an angle of approximately 120 °.

Abstract

PCT No. PCT/CH84/00006 Sec. 371 Date Sep. 11, 1984 Sec. 102(e) Date Sep. 11, 1984 PCT Filed Jan. 12, 1984 PCT Pub. No. WO84/02676 PCT Pub. Date Jul. 19, 1984.The teeth of the saw blade (1) intended for preparing wood comprise a cutting edge (2) beginning at the tip (6) and forming an angle of intersection ( delta ) of 40 DEG -55 DEG . Adjoining the cutting edge (2) at the tooth face there is a cut-back, circular curved section (3). This curved section (3) continues at the bottom into a rounded base (4) between adjacent teeth and then continues into the edge (5) bordering the gap between the teeth, and on into the back of the next tooth. A considerably increased cutting performance is achieved with a saw blade of this kind, since a paring action is effected, and the shavings can roll away easily. Saw blades equipped with this kind of teeth can be made both as circular saw blades and also as bandsaw blades which are moved in a straight line.

Description

Die Erfindung bezieht sich auf ein Kreissägeblatt für die Bearbeitung vorzugsweise von Holz, dessen Zähne mit einem gegossenen oder gesinterten Hartmetalleinsatz versehen sind, wobei die Zähne je eine Schneide und einen gerundeten Zahngrund aufweisen, die Zahnbrust - ausgehend von der Zahnspitze - einen Schneidenteil mit einem Schnittwinkel (8) von weniger als 60° aber mehr als 40° haben, der anschliessende Bogenteil hinterschnitten ist und in den Zahngrund übergeht.The invention relates to a circular saw blade for the machining of wood, the teeth of which are provided with a cast or sintered hard metal insert, the teeth each having a cutting edge and a rounded tooth base, the tooth face - starting from the tooth tip - a cutting part with a cutting angle (8) of less than 60 ° but more than 40 °, the adjoining arch part is undercut and merges into the tooth base.

Für Sägen sind bereits zahlreiche Zahnformen bekannt, die je nach Verwendungszweck und den zu sägenden Materialien unterschiedlich ausgeführt werden.Numerous tooth shapes are already known for saws, which are designed differently depending on the intended use and the materials to be sawn.

Aus der EP-A-00 40 421 ist ein Kreissägeblatt zur Bearbeitung von Holz mit Hartmetalleinsätzen bekannt. Der an die Zahnbrust anschliessende Bereich ist hinterschnitten. Die Längsausdehnung der Hartmetalleinsätze verläuft angenähert rechtwinklig zu einem an die Spitze gelegten Radius. Nachteilig ist indessen, dass die aufgelöteten Hartmetalleinsätze im Betrieb unter der Wirkung der Schneidkräfte zum Ausbrechen neigen.From EP-A-00 40 421 a circular saw blade for processing wood with hard metal inserts is known. The area adjoining the tooth face is undercut. The length of the carbide inserts is approximately at right angles to a radius at the top. However, it is disadvantageous that the brazed carbide inserts tend to break out during operation under the action of the cutting forces.

Die DE-C-815840 zeigt ein Holzsägeblatt mit auswechselbaren Zähnen. Die Zähne sind mit ihrem Schaft je als ein mit einer Schneide versehener Federring ausgebildet, welcher je in eine kreisrunde Oeffnung des Sägeblattes eingesetzt ist. Eine derartige Befestigung von Schneidplättchen hat sich bei hochbeanspruchten Kreissägeblättern als ungenügend erwiesen.DE-C-815840 shows a wood saw blade with interchangeable teeth. The teeth with their shanks are each designed as a spring ring with a cutting edge, which is inserted into a circular opening of the saw blade. Such attachment of cutting tips has proven to be insufficient for highly stressed circular saw blades.

Eine aus der US-A-3 288 180 bekannt gewordene Befestigungsart von Metalleinsätzen besteht darin, dass die mit seitlichen Längsrippen und einem verdickten Fussteil versehenen Einsätze in schräge Nuten des Sägeblattes eingepresst werden. Die Herstellung derartiger Einsätze mit komplizierter Formgebung als gegossene oder gesinterte Hartmetall-Stücke mit den unvermeidlich engen Toleranzen ist sehr schwierig und die Klemmbefestigung in den Nuten des Sägeblattkörpers problematisch.One type of fastening of metal inserts, which has become known from US Pat. No. 3,288,180, consists in that the inserts provided with lateral longitudinal ribs and a thickened foot part are pressed into oblique grooves in the saw blade. The production of such inserts with a complicated shape as cast or sintered hard metal pieces with the inevitably close tolerances is very difficult and the clamp fastening in the grooves of the saw blade body is problematic.

Aufgabe der vorliegenden Erfindung ist die Schaffung eines Kreissägeblattes mit Hartmetalleinsätzen mit dem eine gegenüber konventiellen Sägeblättern wesentlich höhere Schnittleistung möglich ist, wobei die Hartmetalleinsätze einfach herzustellen und am Sägeblattkörper sicher befestigbar sind.The object of the present invention is to provide a circular saw blade with hard metal inserts with which a cutting performance which is substantially higher than that of conventional saw blades is possible, the hard metal inserts being simple to manufacture and securely attachable to the saw blade body.

Diese Aufgabe wird dadurch gelöst, dass sich an die Zahnbrust ein Hartmetalleinsatz ein Bogenteil anschliesst, der absatzlos in den kreisförmigen Zahngrund übergeht und Teil des Hinterschnittes bildet, und wobei der Zahngrund und der Bogenteil des Hartmetalleinsatzes kreisförmig ausgebildet sind, einen gemeinsamen Kreismittelpunkt haben, die Hartmetall-Einsätze im wesentlichen je die Form eines Parallelogrammes haben, wobei die der Schneidspitze abgewandte kurze Seite des Parallelogrammes den konkaven Bogenteil des Hartmetalleinsatzes bildet und die eine längere Seite des Parallelogrammes die Zahnbrust ergibt, und eine an die Zahnbrust angelegte Gerade aus dem hinterschnittenen Bogenteil einen Kreisabschnitt abtrennt, dessen Zentriwinkel (γ) 60-110° beträgt.This object is achieved in that a hard metal insert is followed by a curved part of the arch, which passes seamlessly into the circular tooth base and forms part of the undercut, and wherein the tooth base and the curved part of the hard metal insert are circular, have a common circle center, the hard metal Inserts essentially each have the shape of a parallelogram, the short side of the parallelogram facing away from the cutting tip forming the concave arc part of the hard metal insert and the longer side of the parallelogram forming the tooth face, and a straight line applied to the tooth face from the undercut arc part of a circular section separates, whose central angle (γ) is 60-110 °.

Versuche haben gezeigt, dass die Schnittleistung derartiger Sägeblätter in einem überraschenden Ausmass höher als bei vergleichbaren, handelsüblichen Sägeblättern ist. Dies erklärt sich daraus, dass ein schälender Schneidvorgang stattfindet und die abgetrennten Späne sich abrollen und ungehindert abfliessen können. Ausserdem entstehen saubere Schnittflächen. Auch schwer bearbeitbare Harthölzer lassen sich mit solchen Sägeblättern wesentlich besser sägen als mit konventionellen Sägeblättern. Die Hartmetalleinsätze können auf konventionelle Weise am Sägeblattkörper angelötet werden und lassen sich ohne Veränderung der Schneidengeometrie nachschleifen.Tests have shown that the cutting performance of such saw blades is surprisingly higher than that of comparable, commercially available saw blades. This can be explained by the fact that a peeling cutting process takes place and the separated chips unroll and can flow away unhindered. In addition, clean cut surfaces are created. Even hard-to-work hardwoods can be sawed much better with such saw blades than with conventional saw blades. The hard metal inserts can be soldered to the saw blade body in a conventional manner and can be reground without changing the cutting edge geometry.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes dargestellt.In the drawing, an embodiment of the subject of the invention is shown.

Die Figur zeigt einen Ausschnitt aus einem Kreissägeblatt, bei dem die Zähne mit Hartmetalleinsätzen bestückt sind.The figure shows a section of a circular saw blade in which the teeth are fitted with hard metal inserts.

Das Kreissägeblatt gemäss der Figur hat einen Durchmesser in der Grössenordnung von etwa 50-1 500 mm und dient vorzugsweise der Bearbeitung von Hart- oder Weichholz. Die Zähne eines solchen Kreissägeblattes 1 haben eine gegenüber der konventionellen Ausbildung abweichende Zahnform. Die Zahnbrust 2 jedes Zahnes geht in einen anschliessenden bogenförmigen Teil 3 über, der sich kontinuierliche in einen gerundeten Zahngrund 4 fortsetzt und hernach in einen Zahnrücken 5 übergeht, wobei eine Zahnlücke gebildet wird. Der bogenförmige Teil 3 ist gegenüber einer gedachten geradlinigen Fortsetzung F des Schneidenteiles 2 hinterschnitten und bildet zusammen mit dem Zahngrund 5 einen kreisförmigen Bogenteil 3 mit dem Radius r. Der Mittelpunkt m dieses Radius 3 befindet sich mindestens angenähert auf einem an die Zahnspitze 6 angelegten Radius R bezüglich des Kreissägeblattmittelpunktes. Eine an den Umfangskreis des Kreissägeblattes 1 und durch die Zahnspitze 6 gelegte Tangente T - welche somit rechtwinklig zum Radius R verläuft - bildet zur Zahnbrust 2 resp. zur Geraden F einen Schnittwinkel 8 von weniger als 60°, nämlich 40-55°, vorzugsweise etwa 45-52°. Die Länge L dieser Zahnbrust 2 entspricht etwa 2/3 der Zahn- oder Schnittbreite. Die Länge L des Schneidenteiles 2 wird durch Nachschleifen grösser und kann dann etwa der doppelten Zahndicke entsprechen.The circular saw blade according to the figure has a diameter in the order of about 50-1 500 mm and is preferably used for processing hard or softwood. The teeth of such a circular saw blade 1 have a tooth shape that differs from the conventional design. The tooth face 2 of each tooth merges into an adjoining arcuate part 3, which continues into a rounded tooth base 4 and then merges into a tooth back 5, a tooth gap being formed. The arcuate part 3 is undercut compared to an imaginary straight continuation F of the cutting part 2 and forms together with the tooth base 5 a circular arc part 3 with the radius r. The center m of this radius 3 is at least approximately on a radius R applied to the tooth tip 6 with respect to the center of the circular saw blade. A tangent T placed on the circumferential circle of the circular saw blade 1 and through the tooth tip 6 - which thus runs at right angles to the radius R - forms 2 or. to the straight line F an intersection angle 8 of less than 60 °, namely 40-55 °, preferably about 45-52 °. The length L of this tooth face 2 corresponds to approximately 2/3 of the tooth or cutting width. The length L of the cutting part 2 is increased by regrinding and can then correspond approximately to twice the tooth thickness.

Die Schnittbreite beträgt bei Kreissägedurchmessern von 200 etwa 3 mm, bei 500 mm Durchmesser etwa 4 mm und ist bei Zwischengrössen entsprechend abgestuft.The cutting width for circular saw diameters of 200 is approximately 3 mm, for 500 mm diameter approximately 4 mm and is graded accordingly for intermediate sizes.

Der den Hinterschnitt bildende Bogenteil 3a, 3 und der Zahngrund 4 gehen absatzlos ineinander über und bilden Teil eines Kreises mit dem Radius r. Die Zahntiefe H liegt etwa in der Grössenordnung der halben Zahnteilung t. Der Zentriwinkel y, der durch die Gerade F gebildeten Sehne des Bogenteiles 3a, 3, welche einen Kreisabschnitt abtrennt beträgt 60-110°, vorzugweise etwa 80°.The arch part 3a, 3 forming the undercut and the tooth base 4 merge into each other without a paragraph and form part of a circle with the radius r. The tooth depth H is approximately in the order of half the tooth pitch t. The central angle y of the chord of the curved part 3a, 3 formed by the straight line F, which separates a circular section, is 60-110 °, preferably approximately 80 °.

Die Zähne sind hartmetallbestückt, wobei gesinterte, angelötete Hartmetalleinsätze 12 verwendet werden. Diese haben im wesentlichen die Form eines Parallelogrammes, wobei jedoch die eine kurze Seite konkav gewölbt ist. Die über die Spitzen gemessene Länge L1 beträgt etwa 9-14 mm und die zwischen den langen Parallelflächen gemessene Distanz beträgt etwa 1/4 der Länge. Der Radius r - welcher Bestandteil des kreisförmigen Bogenteiles 3 ist - beträgt bei Kreissägedurchmessern unter 200 mm = etwa 4 mm, bei 200-500 mm Durchmesser = etwa 6 mm und bei über 500 mm Durchmesser = etwa 8 mm. Die Länge L der Zahnbrust beträgt etwa 1/3 bis 3/5 der Zahntiefe H. Bei Kreissägedurchmesser von 50-150 mm beträgt die Zahntiefe etwa 10-12 mm, darüber in der Regel etwa 12-22 mm. Der Mittelpunkt m des einen Kreisausschnitt bildenden Bogenteiles 3a, 3, liegt angenähert auf einem Radius R1' der vom Kreissägemittelpunkt aus an das innere Ende des Schneidenteiles gelegt ist. Dies entspricht dem Punkt 16 am Uebergang zwischen der geradlinigen Zahnbrust 2 und dem gewölbten Bogenteil 3a des Hartmetalleinsatzes. Der Radius r entspricht etwa 1/4 der Zahntiefe H. Die Tiefe h des Hinterschnittes des Bogenteiles 3a und 3 liegt etwa in der Grössenordnung von 3/8 r. Der Hinterschnitt 3a und 3 kann indessen auch als Grösse des Zentriwinkels Υ ausgedrückt werden. Der Zentriwinkel -y der Sehne, welche die Gerade F aus dem Bogenteil 3a, 3 herausschneidet beträgt 60-110°, vorzugsweise etwa 90°. Der auf den Bereich des Hartmetalleinsatzstückes 12 fallende Kreis-Bogenteil 3a entspricht etwa dem halben Zentriwinkel γ und bildet somit Teil des Hinterschnittes. Der Freiwinkel a beträgt 5-15°, der Spanwinkel ϕ liegt bei etwa 38-42° und der Keilwinkel β bei 30-55°, vorzugsweise etwa 35-47°. Wenn der Freiwinkel a ein Minimum von 5° beträgt, soll der Keilwinkel β im Minimum 40°, im Maximum 55° betragen ; wenn dagegen der Freiwinkel α ein Maximum von 15° beträgt, soll der Keilwinkel β im Minimum 30° und im Maximum 45° betragen. Zwischengrössen sind entsprechend abzustufen. Eine an den Rücken 15 angelegte Gerade trifft den Punkt 16 des nächsten Zahnes angenähert am Uebergang zwischen der Zahnbrust 2 und dem Bogenteil 3. Die an den Rücken 15 anschliessene Zahnlückenkante 5 bildet zur Geraden F einen spitzen Winkel, sodass die abgetrennten Späne ausreichend Platz haben, um ungehindert aus dem sich nach aussen erweiternden Spanraum austreten zu können. Der Bogenteil 3 und der gewölbte Zahngrund 4 bilden zusammen mehr als einen Halbkreis, vorzugsweise einen Winkel von etwa 120°.The teeth are equipped with hard metal, sintered, soldered hard metal inserts 12 being used. These are essentially in the form of a parallelogram, but one short side is concave. The length L 1 measured over the tips is approximately 9-14 mm and the distance measured between the long parallel surfaces is approximately 1/4 of the length. The radius r - which is part of the circular arc part 3 - is for circular saw diameters below 200 mm = about 4 mm, for 200-500 mm diameter = about 6 mm and for over 500 mm diameter = about 8 mm. The length L of the tooth face is about 1/3 to 3/5 of the tooth depth H. For circular saw diameters of 50-150 mm, the tooth depth is about 10-12 mm, above that about 12-22 mm as a rule. The center point m of the arcuate part 3a, 3 forming a circular section lies approximately on a radius R 1 ' which is placed from the center of the circular saw at the inner end of the cutting part. This corresponds to point 16 at the transition between the straight tooth face 2 and the curved arch part 3a of the hard metal insert. The radius r corresponds to approximately 1/4 of the tooth depth H. The depth h of the undercut of the curved part 3a and 3 is approximately of the order of 3/8 r. The undercut 3a and 3 can also be expressed as the size of the central angle Υ. The central angle -y of the chord, which cuts the straight line F out of the curved part 3a, 3, is 60-110 °, preferably about 90 °. The circular arc part 3a falling on the area of the hard metal insert 12 corresponds approximately to half the central angle γ and thus forms part of the undercut. The clearance angle a is 5-15 °, the rake angle ϕ is approximately 38-42 ° and the wedge angle β is 30-55 °, preferably approximately 35-47 °. If the clearance angle a is a minimum of 5 °, the wedge angle β should be a minimum of 40 ° and a maximum of 55 °; if, on the other hand, the clearance angle α is a maximum of 15 °, the wedge angle β should be a minimum of 30 ° and a maximum of 45 °. Intermediate sizes are graded accordingly. A straight line applied to the back 15 meets the point 16 of the next tooth approximately at the transition between the tooth face 2 and the arch part 3. The tooth gap edge 5 connected to the back 15 forms an acute angle to the straight line F, so that the separated chips have sufficient space, in order to be able to emerge freely from the chip space widening outwards. The arch part 3 and the arched tooth base 4 together form more than a semicircle, preferably an angle of approximately 120 °.

Claims (3)

1. Circular saw blade for the working preferably of wood, the teeth of which are each provided with a hard metal insert (12), the teeth each having a cutting edge and a rounded tooth root (4), the tooth face (2) - originating from the tooth tip (6) - having a cutting edge part with a cutting angle (8) of less than 60° but more than 40°, the adjacent curved part (3) being undercut and leading into the tooth root (4), characterised in that adjacent to the tooth face (2) in the hard metal insert is a curved part (3a), which leads without interruption into the circular tooth root (4) and forms part of the undercut, and the tooth face (4) and the curved part (3a) of the hard metal insert (12) being constructed as a circle, having a common circle centre (m), with the hard metal inserts essentially having the shape of a parallelogram, the short side of the parallelogram turned away from the cutting tip (6) forming the concave curved part (3a) of the hard metal insert (12) and the longer side of the parallelogram forming the tooth face (2), and a straight line (F) drawn at the tooth face (2) and coming from the undercut curved part (3a, 3) cutting off a circle segment of which the angle at the centre (γ) is 60 to 110°.
2. Circular saw blade according to Claim 1, characterised in that the longer side of the parallelogram is 9-14 mm and the radius (r) is approximately 4 mm with circular saw diameters of under 200 mm, is approx. 6 mm with circular saw diameters of from 200 to approx. 500 mm, and is approx. 8 mm with larger diameters.
3. Circular saw blade according to Claim 1 or 2, characterised in that the clearance angle (a) is 5-15°, the rake angle (ϕ) is 38-42°, the wedge angle (β)is 30-55° and the length of the tooth face is 1/3 to 3/5 the tooth depth (H).
EP84900378A 1983-01-13 1984-01-12 Saw blade Expired EP0132259B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH168/83A CH660326A5 (en) 1983-01-13 1983-01-13 SAW BLADE FOR THE PROCESSING OF WOOD OR SIMILAR MATERIALS.

Publications (2)

Publication Number Publication Date
EP0132259A1 EP0132259A1 (en) 1985-01-30
EP0132259B1 true EP0132259B1 (en) 1987-07-08

Family

ID=4180804

Family Applications (1)

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EP84900378A Expired EP0132259B1 (en) 1983-01-13 1984-01-12 Saw blade

Country Status (9)

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US (1) US4587876A (en)
EP (1) EP0132259B1 (en)
AT (1) ATE28140T1 (en)
AU (1) AU2349384A (en)
CH (1) CH660326A5 (en)
DE (1) DE3464550D1 (en)
DK (1) DK434384A (en)
IT (1) IT1173028B (en)
WO (1) WO1984002676A1 (en)

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Also Published As

Publication number Publication date
EP0132259A1 (en) 1985-01-30
DK434384D0 (en) 1984-09-12
IT8419156A0 (en) 1984-01-13
DE3464550D1 (en) 1987-08-13
WO1984002676A1 (en) 1984-07-19
IT1173028B (en) 1987-06-18
DK434384A (en) 1984-09-12
US4587876A (en) 1986-05-13
ATE28140T1 (en) 1987-07-15
CH660326A5 (en) 1987-04-15
AU2349384A (en) 1984-08-02

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