Grinding tool for buttons of a rock drill bit

B - Operations – Transporting – 24 – B

Patent

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Details

B24B 3/33 (2006.01) B24B 45/00 (2006.01) B24D 7/00 (2006.01) B24D 7/18 (2006.01)

Patent

CA 2404156

The present invention provides a grinding cup (31) having a lower grinding section (32) and an upper body section (33) connected to form a grinding cup having top (34) and bottom surfaces (35). The grinding section (32) is formed from a material capable of grinding the hard materials such as tungsten carbide inserts of button bits etc. A centrally disposed convex recess is formed in the bottom surface (35) having the desired size and profile for the button to be ground. Drive means (38) are provided on or in the upper body section that cooperate with the output shaft of the grinding machine. The drive means (38) and the upper body section or grinding section (33) of the grinding cup are adapted to optimize the engagement surfaces and points of contact between the grinding cup (31) and rotor or adapter to reduce negative impact on operational stability and rotor wear, as well as other potential associated wear to the grinding apparatus caused by vibration and/or resonance.

L'invention concerne une calotte de rectification (31) ayant une section rectification inférieure (32) et une section corps supérieure (33) reliées pour former une calotte de rectification présentant une surface supérieure (34) et une surface inférieure (35). La section rectification (32) est faite dans un matériau capable de rectifier les matériaux durs tels que des insertions de carbure de tungstène de trépans à pastilles, etc. Au centre de la surface inférieure (35), est formé un évidement convexe présentant la dimension et le profil voulus pour la pastille à rectifier. Des moyens d'entraînement (38), placés sur ou à l'intérieur de la section corps, coopèrent avec l'arbre de sortie de la machine à rectifier. Ces moyens d'entraînement (38), ainsi que la section corps supérieure, ou section rectification (33), de la calotte de rectification sont conçus pour optimiser les surfaces de prise et les points de contact entre la calotte de rectification (31) et le rotor ou l'adaptateur afin de réduire l'impact négatif sur la stabilité opérationnelle et l'usure du rotor, ainsi que d'autres usures potentielles connexes de l'appareil de rectification provoquées par des vibrations et/ou des résonances.

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