Rotatable toolholder having a stationary, through-center...

B - Operations – Transporting – 23 – Q

Patent

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Details

B23Q 1/00 (2006.01)

Patent

CA 2191593

A rotatable toolholder (1) is provided having a stationary coolant feed system (60) for directing a through-center, non-rotating coolant stream to a coolant conducting bore (82) in a rotating cutting tool (25). The rotatable toolholder (1) comprises a stationary housing (3), a driven shaft (5) having an output end (13) rotatably mounted in the housing (3), and a tool coupling (17) rotatably mounted on an opposite side of the housing (3) for holding and rotating the end of a cutting tool (25). The coolant system (60) of the toolholder (1) includes a nozzle assembly (70) stationarily mounted within the housing (3) and having a nozzle (76) for directing a non-rotating stream of coolant into the coolant conducting bore (82) of the tool (25), and a stationary conduit (48) for conducting a coolant flow from a source (63) of pressurized coolant to the nozzle assembly (70) while isolating the coolant flow from the rotating components within the housing (3). A transmission assembly (100) is provided within the housing for transmitting rotary power from the driven shaft (5) to the tool coupling (17). The use of a stationary nozzle assembly (20) isolates the flow of coolant from centrifugal forces that the rotating components within the housing (3) would otherwise apply to it, while the isolating function of the coolant supply conduit (48) obviates the need for dynamic fluid seals between the housing (3) and the driven shaft (5) and tool coupling (17) that leak and create frictional drag, and also renders unnecessary micro particle filtration of recirculated coolant.

Un porte-outil rotatif (1) comporte un système d'alimenation de lubrifiant fixe (60) dirigeant un courant lubrifiant non rotatif, traversant le moyeu, dans un alésage (82) acheminant le lubrifiant dans un outil de coupe rotatif (25). Le porte-outil rotatif (1) comprend un corps fixe (3), un arbre moteur (5) comportant une extrémité d'entraînement (13) montée rotative dans le corps (3), et un serre-outil (17) monté rotatif sur un côté opposé du corps (3) afin de retenir et faire tourner l'extrémité d'un outil de coupe (25). Le système (60) du lubrifiant du porte-outil (1) comprend un ensemble ajutage (70) monté inamovible dans le corps (3) et pourvu d'un ajutage (76) dirigeant un courant non rotatif de lubrifiant dans le canal (82) de l'outil (25), et un conduit fixe (48) acheminant l'écoulement de lubrifiant d'une source (63) de lubrifiant sous pression à l'ensemble ajutage (70) tout en isolant cet écoulement des composants en rotation du corps (3). Un ensemble de transmission (100) est ménagé dans le corps (3) pour transmettre une force rotative de l'arbre moteur (5) au serre-outil (17). L'ensemble ajutage fixe (20) évite à l'écoulement de lubrifiant d'entrer en interférence avec les forces centrifuges que les composants en rotation du corps (3) appliquent normalement sur l'écoulement, et cette non-interaction au niveau du conduit d'amenée (48) du lubrifiant rend superflu, d'une part, l'emploi d'un dispositif de joints dynamiques fluides entre le corps (3), l'arbre moteur (5) et le serre-outil (17), dispositif qui fuit et crée un effet de friction, et, d'autre part, la filtration des microparticules du lubrifiant soumis à une recirculation.

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