Device for positioning a machining spindle using the pilot...

B - Operations – Transporting – 23 – C

Patent

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Details

B23C 3/05 (2006.01) B23Q 1/54 (2006.01) F16M 11/14 (2006.01)

Patent

CA 2225496

Means for aligning the device include a ball holder (17) placed on a base (4) in such a way that it is movable in all directions in a horizontal plane during the positioning phase of the spindle (6), a spherical ball (13) freely rotatably mounted in the ball holder (17), and a substantially vertical quill (10) that is axially movable within the ball (13) and supports the tool driving spindle. Said spherical ball (13) has weights that balance the weight of the means for translating the quill (10) and that of said quill and said spindle when the latter are in the lower aligned position, so that said weights return the centre of gravity (G) of the assembly substantially into alignment with the axis (x, x') of the quill (10), whereas the electrical means (28, 29) for driving the spindle (6) are arranged in the quill (10) and thus locate the centre of gravity thereof on said axis (x', x) and close to the centre (C) of the spherical ball (13) when said quill is in the lower aligned position. Furthermore, means for generating a planar air cushion between the base (4) and the ball holder (17) include jets (47) arranged in the base (4) opposite the ball holder (17) for feeding a film having a uniform thickness, and clamping means include nozzles (62) separate from the cushion-forming jets (47) and capable of being connected to a vacuum source.

Les moyens d'alignement de ce dispositif comprennent un porte-sphère (17) posé sur un support (4) avec possibilité, dans la phase de positionnement de la broche (6), de déplacement dans toutes les directions du plan horizontal, une noix sphérique (13) montée dans le porte-sphère (17) avec possibilité de libre rotation, un fourreau (10) sensiblement vertical, déplaçable axialement dans la noix (13) et portant la broche d'entraînement de l'outil. Selon l'invention, la noix sphérique (13) porte des masses qui, équilibrant la masse des moyens d'entraînement en translation du fourreau (10) et la masse de ce fourreau et de la broche, lorsque ceux-ci sont en position abaissée d'alignement, ramènent le centre de gravité (G) de l'ensemble sensiblement dans l'axe (x, x') du fourreau (10), tandis que les moyens électriques (28, 29) de motorisation de la broche (6) sont diposés dans le fourreau (10) et de manière que, lorsque ce fourreau est en position abaissée d'alignement, le centre de gravité de ce fourreau soit dans l'axe (x', x) et près du centre (C) de la noix sphérique (13), que les moyens de génération du coussin plan entre le support (4) et le porte-sphère (17) comprennent des gicleurs (47) disposés dans le support (4) en vis-à-vis du porte-sphère (17) et aptes à débiter un film d'épaisseur uniforme, et que les moyens de bridage comprennent des ajutages (62) distincts des gicleurs (47) de sustentations et aptes à être reliés à une source de vide.

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