B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 31/20 (2006.01) B23B 31/00 (2006.01)
Patent
CA 2169647
A toolholder (1) of the type including a collet (5) integrally formed with a shank (3) is provided with an interface between a locknut (7) and collet (13) which substantially reduces the torque required to turn the locknut (7) into a position which radially collapses the collet segments (17). In this interface, one of either the inner locknut surface (23) or the outer surfaces of the collet segments (17) includes an engaging portion (56) for wedgingly flexing the collet segments (17) inwardly when the locknut is turned, and a non-engaging portion (58) disposed between the engaging portion (56) and the shank mounted ends of the collet segments (17). The non-engaging portion (58) reduces the torque required to turn the locknut (7) by reducing the binding forces that would otherwise occur between the ends of the collet segments (17) and the inner locknut surface (23). To further reduce torque, the collet portion interconnecting the collet segments (17) with the shank (3) of the toolholder is rendered thinner by the provision of circumferential grooves (72, 76) that make the collet segments (17) more flexible. Sealing rings (66, 74, 81) are seated in grooves (68, 72, 76) present in the interior defined by the collet segments (17) in order to prevent errant flows of coolant or debris from collecting between the collet segments (17) and the tool shank (9) gripped thereby.
Mandrin (1) à pince (5), intégré à sa tige porteuse (3), et muni d'une interface entre la bague de serrage (7) et la pince (13) réduisant sensiblement le couple à exercer sur la bague de serrage pour déplacer radialement les mors (17) de la pince. Dans ladite interface, ou la surface intérieure de la bague de serrage (23), ou la surface extérieure des mors comporte une partie en prise (56) qui fléchit par coincement les mors (17) vers l'intérieur quand on tourne la bague de serrage et une partie non en prise (58) placée entre la partie non en prise (56) et les extrémités des mors montées sur la tige. La partie non en prise (58) réduit le couple à exercer sur la bague de serrage (7) en réduisant les forces de liaison qui sans cela apparaîtraient entre les extrémités des mors (17) et la surface intérieure de la bague de serrage (23). Pour réduire encore le couple, la partie de la pince reliant les mors (17) à la tige porte-mandrin (3) est amincie par des rainures circonférentielles (72, 76) qui rendent les mors (17) plus flexibles. Des bagues d'étanchéité (66, 74, 81) sont placées dans des rainures (68, 72, 76) pratiquées dans l'espace intérieur délimité par les mors (17) de la pince pour empêcher la pénétration de liquides ou de particules errantes entre les mors de la pince et la queue de l'outil serré.
Lewis David L.
Mogilnicki Victor D.
Presby Thomas J.
Kennametal Inc.
Smart & Biggar
LandOfFree
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