Method of making endmills

B - Operations – Transporting – 23 – C

Patent

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Details

B23C 5/10 (2006.01) B23B 27/18 (2006.01) B23P 15/34 (2006.01)

Patent

CA 2290023

The present invention relates to an endmill provided with cutting edges of cBN or PCD and consisting of a shank part and a part containing the cBN or PCD brazed to the shank. The latter part is in the form of a disc in which the superhard material is present in a groove in the envelope surface and extends from one end surface to the other. After brazing the disc to the shank, the body obtained is ground to an endmill with cutting edges formed of superhard material. In a preferred embodiment, the shank is provided with a tenon against which the part containing the superhard material is brazed. This minimises the risk of braze joint failure and provides an endmill with several cutting edges which can be achieved at a low cost.

L'invention concerne une fraise dotée d'arêtes de coupe en nitrure de bore cubique ou en diamant polycristallin, comprenant une partie queue et un élément contenant le nitrure de bore cubique ou le diamant polycristallin. Cet élément, fixé à la queue par brasage, a la forme d'un disque dans lequel le matériau extra-dur est présent dans une rainure pratiquée à la surface de l'enveloppe et s'étend de la face d'une extrémité à la face de l'autre extrémité. Une fois le disque fixé à la queue par brasage, le corps ainsi obtenu est usiné pour donner une fraise dotée d'arêtes de coupe en matériau extra-dur. Dans un mode de réalisation préféré, la queue est dotée d'un tenon sur lequel l'élément contenant le matériau extra-dur est fixé par brasage. Cela réduit le risque de défaillance aux points de brasage et permet la fabrication à faible coût d'une fraise pourvue de plusieurs arêtes de coupe.

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