Grinding cup and wear part therefor

Details Grinding cup and wear part therefor Grinding cup and wear part therefor

B - Operations, Transporting

24

B

B24B 3/33 (2006.01) B24D 7/10 (2006.01)

Patent

CA 2203673

The present invention relates to a grinding cup (10; 10'; 10") for a grinding machine used in the grinding of buttons of a rock drilling bit. The grinding cup (10; 10'; 10") includes a shank (11), flush channels (18, 25) and a wear part (12; 12'; 12"). The wear part (12; 12'; 12") has a cavity (15) which grinds the button (16). One of the flush channels, referred to as a second flush channel (25) terminates at least partly in the cavity. The grinding cup has a center axis (14). An intermediate conduit means (23; 23'; 23") is provided between a first flush channel (18) and the second flush channel (25), said intermediate conduit means having a larger radial extension than the second flush channel. The second flush channel (25) is displaced in the radial direction relative to the center axis (14). The cavity (15) has a radially outermost border line (L1). The second flush channel has a radially innermost part (26) which is radially separated a distance (S) from the center axis (14). The distance (S) is larger than 2% of the largest diameter (D) of the cavity (15).

L'invention concerne une meule-boisseau (10; 10'; 10") destinée à être montée sur une meuleuse. La meule-boisseau (10; 10'; 10") sert à meuler les pastilles d'un trépan. La meule-boisseau (10; 10'; 10") comprend une tige (11), des canaux noyés (18, 25) et une pièce d'usure (12; 12'; 12"). Cette dernière (12; 12'; 12") comporte une cavité (15) où les pastilles (16) sont meulées, un second canal noyé (25) se terminant au moins partiellement dans la cavité. La meule-boisseau comporte un axe (14) médian. Il est prévu entre un premier (18) et un second canal noyé (25) un espace (23; 23'; 23") dont l'extension dans le sens radial est plus importante que le second canal noyé et ce dernier (25) est déplacé dans le sens radial par rapport à l'axe médian (14). La cavité (15) comporte une ligne de délimitation (L1) s'étendant le plus à l'extérieur dans le sens radial et la partie (26) la plus à l'intérieur du second canal noyé (25) est séparée dans le sens radial d'une distance (S) de l'axe médian (14). La distance (S) dépasse de 2 % le plus grand diamètre (D) de la cavité (15).

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