The invention relates to a variable hydrostatic guideway for vertical lathes that includes a plurality of sectors (4) arranged between the periphery (1b) and a central opening (1a) of an annular base (1), each sector (4) including an upper housing (4a) having an outlet for hydraulic fluid (4b) such that, when the injected hydraulic fluid overflows from the housings (4a), it forms a film between a rotating plate (3) and the sectors (4); a positioning mechanism that includes a plurality of hydraulic cylinders (5) attached radially to the annular base (1) between the central opening (1a) and the sectors (4), the rod of each hydraulic cylinder (5) being connected to a piston (5j) and to one of the sectors (4); each sector (4) is guided in a radial guidance element (6) such that, by the action of the hydraulic cylinder (5), the sector (4) can move between an inside radial position and an outside radial position.
B23Q 1/38 - Supports mobiles ou réglables d'outils ou de pièces caractérisés par des particularités de structure concernant la coopération des organes animés d'un mouvement relatifMoyens pour empêcher un déplacement relatif de ces organes utilisant des paliers à fluide ou des supports à coussin de fluide
B23Q 1/52 - Supports mobiles ou réglables d'outils ou de pièces utilisant des mécanismes particuliers avec des guidages en rotation uniquement avec un seul guidage en rotation
F16C 32/06 - Paliers non prévus ailleurs comprenant un élément mobile supporté par un coussinet de fluide engendré, au moins en grande partie, autrement que par la rotation de l'arbre, p. ex. paliers hydrostatiques à coussinet d'air
2.
MACHINE AND METHOD FOR MACHINING LARGE CRANKSHAFTS
The invention relates to a machine and method for machining large crankshafts, enabling the simple and reliable synchronisation of the rotational movement of the crankshaft (14) at all of the points thereof. The machine includes: a machining tool (1) configured to move along the length of at least one guide (2) between a first end supporting element (3) and a second end supporting element (4), an electronic angular position sensor (6) located on a first rotation shaft (7) of the first end supporting element (3), and a second electronic angular position sensor (8) located on a second rotation shaft (9) of the second end supporting element (4), such that the rotational movement of the first end supporting element (3) is electronically synchronised with the rotational movement of the second end supporting element (4) at all times during the machining of the crankshaft (14).
B23B 5/18 - Machines ou dispositifs à tourner spécialement conçus pour un travail particulierAccessoires correspondants spécialement conçus à cet effet pour tourner des vilebrequins, des excentriques ou des cames, p. ex. tours pour manetons de vilebrequins
B23Q 15/22 - Commande ou régulation de la position de l'outil ou de la pièce
G05B 19/18 - Commande numérique [CN], c.-à-d. machines fonctionnant automatiquement, en particulier machines-outils, p. ex. dans un milieu de fabrication industriel, afin d'effectuer un positionnement, un mouvement ou des actions coordonnées au moyen de données d'un programme sous forme numérique
3.
SUPPORTING ELEMENT AND MACHINE FOR MACHINING LARGE CRANKSHAFTS
The invention relates to a supporting element and a machine for machining large crankshafts, enabling the anchoring of a crankshaft (1) to be machined and the transmission of a torque thereto using a rotation shaft (2). The invention includes zero-clearance rotation transmission means comprising at least a first endless screw (3) and at least a second endless screw (4) which are functionally connected to a crown wheel (5) configured to transmit torque to the crankshaft (1). According to the invention, the first endless screw (3) is functionally connected to the second endless screw (4) and the connection area between the first endless screw (3) and the crown wheel (5) is different from the connection area between the second endless screw (4) and the crown wheel (5).
brevets