B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/02 (2006.01) B24B 3/26 (2006.01) B24B 49/00 (2006.01) B24D 3/26 (2006.01) C21D 3/04 (2006.01) C21D 9/22 (2006.01) C22F 1/02 (2006.01)
Patent
CA 2153881
The present invention provides a method of surface decarburizing a cemented carbide cutting tool. The tool is placed in a protective environnement. The tool is heated to an elevated temperature of between 600-1100 degrees C while in the protective environment for a period of 15-120 minutes. In another aspect of the invention, a drill is provided having a drill body which has a cutting tip, an axis of symmetry, and a plurality of flutes (15), wherein the flutes have a rake surface at the cutting tip. The cutting tip comprises a plurality of side blades (42) between the flutes and joined at a web. A plurality of flank surfaces (47) extend from an outer diameter of the cutting tip to the axis of symmetry and a plurality of primary cutting edges (40) are present at the intersection of the flank surfaces with the rake surfaces. The primary cutting edges include either an angular (41) or radius surface or a combination thereof extending from the flank surfaces to the rake surfaces.
Procédé de décarburation superficielle d'un outil de coupe au carbure cémenté, consistant à le maintenir dans une atmosphère protégée à une température comprise entre 600 et 1100~C pendant 15 à 120 minutes. L'invention porte également sur un foret comportant un corps, une pointe, un axe de symétrie et plusieurs goujures (15) présentant une face de dépouille sur la pointe. Ladite pointe comporte plusieurs lames latérales (42) situées entre les goujures et qui se rejoignent au niveau d'une partie jointive (47). Plusieurs faces de coupe (47) s'étendent entre le diamètre extérieur de la pointe et son axe de symétrie et plusieurs tranchants primaires (40) se trouvent à l'intersection des faces de coupe avec les faces de dépouille. Les tranchants primaires comportent une surface d'angle (41) ou une surface radiale ou une combinaison des deux s'étendant entre les faces de coupe et les faces de dépouille.
Britzke Robert W.
Eason Jimmy
Fang Zhigang
Ridout & Maybee Llp
Rogers Tool Works Inc.
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