Rotary cutting tools for working of woods or wood-based...

B - Operations – Transporting – 27 – G

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B27G 15/00 (2006.01) B23D 61/04 (2006.01) B27G 13/00 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2172366

A rotary cutting tool has a cutting blade which is formed with an outer peripheral surface edge and a side surface edge. A flank (4) of the side surface edge having a clearance angle of not more than 10° in a direction of rotation of the side surface edge is finished to have a surface roughness Rmax of 1 to 10 µm. The outermost surface is covered with chromium or one of chromium nitride, carbide and carbide nitride whereby a harmful resin is prevented from adhering to the tool. The use of this tool provides more than ten times the life of a conventional tool and permits the use of high speed tool steel as a material for a blade edge in place of cemented carbide to make the tool inexpensive.

Un outil de coupe rotatif comprend une lame pourvue d'une arête périphérique extérieure et d'une arête latérale. Une face de dépouille (4) de l'arête latérale, se trouvant à un angle de dépouille ne dépassant pas 10 DEG dans le sens de rotation de l'arête latérale, présente un degré de finition tel que sa rugosité Rmax est comprise entre 1 et 10 mu m. La surface située le plus à l'extérieur est recouverte de chrome ou soit de nitrure de chrome, soit de carbure de chrome, ou bien à la fois de nitrure et de carbure de chrome, ce qui empêche la résine, qui est nuisible pour l'outil, d'adhérer à celui-ci. La vie utile d'un tel outil est plus de 10 fois plus longue que celle d'un outil classique. En outre, étant donné que l'on peut utiliser, pour constituer l'arête de la lame, de l'acier rapide au lieu d'un carbure cémenté, ledit outil est peu onéreux.

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