Cbn sintered body for high surface integrity machining, cbn...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/583 (2006.01) B23B 27/14 (2006.01)

Patent

CA 2571470

To provide a high cBN content ratio sintered body that improves fatigue life of the machined part and has a longer tool lifespan than conventional cBN sintered body tools by suppressing the production of the affected layer by machining formed on the machined surface of the workpiece to be cut and by promoting residual compression stress. That is a cBN sintered body according to the present invention is a cBN sintered body for high surface integrity machining having a cBN component of not less than 87% and not more than 99% by volume% and a thermal conductivity of 100 W/m.cndot.K or more; and the outermost surface of the cBN sintered body 1 is coated with a heat resistant film 2 having a thickness of 0.5 µm to 12 µm comprising a compound of at least one element selected from 4a, 5a, 6a group elements and A1, and at least one element selected from C, N, and O.

La présente invention concerne un corps fritté avec une teneur en cBN élevée qui, par rapport aux outils de corps fritté en cBN conventionnels, présente l'occurrence de couche affectée d'usinage sur un plan d'usinage de matériau qui peut être usiné et favorise la rétention de contrainte de compression pour ainsi atteindre une prolongation de la résistance à la fatigue de parties usinées et également réaliser une prolongation de la vie utile de l'outil. Un corps fritté en cBN est prévu pour un usinage de propriété de surface de haute qualité, caractérisé en ce que la surface la plus haute du corps fritté en cBN (1) qui contient, en % volumique, 87 à 99 % de composant de cBN et qui possède une conductivité thermique de 100 W/m·K ou plus est enduite avec un film thermostable de 0,5 à 12 µm d'épaisseur (2) constitué d'un composé d'au moins un élément sélectionné parmi les éléments du Groupe 4a, Groupe 5a et Groupe 6a et Al et au moins un élément sélectionné parmi C, N et O.

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