Abstract:
A linear motor system for providing XY motion comprises a first linear motor (10) directed for effecting movement of a first element (11) in a first of two orthogonal directions. There is second motor (12) directed for effecting movement of a second element (13) in a second of the orthogonal directions. The motors are mounted on a base (14) such that the elements (11 and 13) are located and movable in a single plane in the respective orthogonal directions relative to each other over the base (14). A shuttle (16) is reactive with the two elements (11 and 13) such that movement of the elements effects XY movement of the shuttle (16). The elements (11 and 13) and the shuttle (16) are mounted on air bearings (200, 201, 202) and interaction of the shuttle (16) with the elements (11 and 13) is also through air bearings (206) to control angular movement of the shuttle (16). This system provides for very fine movement in an XY direction which can be precisely controlled while angular movement of the shuttle (16) is prevented.
Abstract:
A part holder (10) for parts to be machined with machine tools, particularly for parts having a large mass to be machined in vertical lathes, which comprises: a worktable (11) for supporting a part (12), a footing (13) for supporting the worktable (11), at least one hydrostatic supporting bearing (14) for supporting the worktable (11) on the footing (13), at least one preloading bearing (15), which is interposed between the worktable (11) and the footing (13), in a dynamic parallel configuration with respect to the supporting bearing (14), means (16) for modulating a preloading imparted to the supporting bearing (14), means (17) for sensing at least one functional parameter (A) of at least one chosen supporting slider (14a) of the supporting bearing (14), and a central unit (18) for controlling the modulation means (16). The control unit (18) is functionally connected to the sensing means (17) so as to receive from them estimates of the functional parameter (A), and to the modulation means (16) so as to drive them as a function of these estimates.
Abstract:
A spindle unit for a machine tool for fine-machining workpieces that have groove-shaped profiles, such as, for example, toothings, has a rotatably mounted spindle shaft (2). Said spindle shaft is subdivided in the axial direction (AR), one behind the other, into a fastening portion (A) for fastening a tool (4) or a workpiece to be machined, a first bearing portion (B), a force transmission portion (C), and a second bearing portion (D). A drive unit (5) serves to drive the spindle shaft (2) by way of force transmission onto the force transmission portion (C). A first and a second bearing point (13, 14) are designed to bear the spindle shaft (2) in the first bearing section (B), and a third bearing point (15) serves to mount the spindle shaft (2) on the second bearing portion (D). The first and the second bearing points (13, 14) each have one or more hydrostatic bearings and are designed to receive radial and axial forces. The third bearing point (15) has one or more hydrostatic and/or hydrodynamic bearings and is designed to receive radial forces.
Abstract:
Eine Spindeleinheit für eine Werkzeugmaschine zur Feinbearbeitung von Werkstücken mit nutförmigen Profilen, wie insbesondere Verzahnungen, weist eine drehbar gelagerte Spindelwelle (2) auf, welche in Axialrichtung (AR) der Reihe nach in einen Befestigungsabschnitt (A) zum Anbringen eines Werkzeugs (4) oder eines zu bearbeitenden Werkstücks, einen ersten Lagerungsabschnitt (B), einen Kraftübertragungsabschnitt (C) und einen zweiten Lagerungsabschnitt (D) unterteilt ist. Eine Antriebseinheit (5) dient zum Antreiben der Spindelwelle (2) mittels Kraftübertragung auf den Kraftübertragungsabschnitt (C). Eine erste und eine zweite Lagerstelle (13, 14) sind zur Lagerung der Spindelwelle (2) im ersten Lagerungsabschnitt (B) vorgesehen, sowie eine dritte Lagerstelle (15) zur Lagerung der Spindelwelle (2) am zweiten Lagerungsabschnitt (D). Die erste und die zweite Lagerstelle (13, 14) weisen jeweils eines oder mehrere hydrostatische Lager auf und sind zur Aufnahme von Radial-und Axialkräften ausgebildet. Die dritte Lagerstelle (15) weist eines oder mehrere hydrostatische und/oder hydrodynamische Lager auf und ist zur Aufnahme von Radialkräften ausgebildet.
Abstract:
A device (1) for measuring a force acting between a machining tool (4) and a work piece in a processing machine is disclosed. It comprises an arrangement of at least two hydrostatic pads (7), wherein the at least two hydrostatic pads are designed to receive and support a mounting part (10) of the machining tool (4), and each hydrostatic pad of the at least two hydrostatic pads (7) presenting a pressure sensor (13), a calculation unit (16) for --reading hydrostatic pad pressure related to the pressure sensors (13) and a constant based on characteristics of each one of the at least two hydrostatic pads (7), --calculating the force by calculating a difference between the products of, for each hydrostatic pad of the at least two hydrostatic pads (7), the hydrostatic pad pressure and the constant, and --indicating the force. Also, a device for monitoring a machining tool and a device for compensating for a deflection of a machining tool when machining a work piece comprising the device are disclosed.
Abstract:
A linear motor system for providing XY motion comprises a first linear motor (10) directed for effecting movement of a first element (11) in a first of two orthogonal directions. There is a second linear motor (12) directed for effecting movement of a second element (13) in a second of the orthogonal directions. The motors (10 and 12) are mounted on a base (14) such that the elements (11 and 13) are located and movable in a single plane in the respective orthogonal directions relative to each other over the base. A shuttle (16) is reactive with the two elements (11 and 13) such that movement of the elements effects XY movement of the shuttle. The elements (11 and 13) and the shuttle (16) are connected through a bearing force. The bearing force is created selectively by a vacuum attracting force cooperating with an air bearing repelling force, a magnetic attracting force cooperating with an air bearing repelling force, an air bearing repelling force in a first direction and an air bearing repelling force in an opposite direction, or a mechanical linkage. There is very fine movement in an XY direction which can be precisely controlled while angular movement of the shuttle (16) is prevented.
Abstract:
Bearbeitungszentrum (1) bestehend aus einem ersten Maschinenbett (2) und einem parallelen zweiten Maschinenbett (3), wobei auf dem ersten Maschinenbett (2) ein Spindelstock (4) gelagert sowie ein Reitstock (6) und/oder mindestens eine Lünette (7) längs verfahrbar angeordnet sind und wobei auf dem zweiten Maschinenbett (3) eine Bearbeitungseinheit (8) mit einer Vorsatzkopfaufnahme (9) und/oder einem Werkzeugwechselsystem (10) längsverfahrbar angeordnet ist, wobei die auf dem zweiten Maschinenbett (3) längsverfahrbare Bearbeitungseinheit (8) aus einem hydrostatisch auf dem zweiten Maschinenbett (3) gelagerten Bettschlitten (13) mit einem darauf angeordnetem, kastenförmig ausgebildeten Torständer (13a) besteht, wobei zwischen Führungen (14) in bzw. an den beiden Seiten (15) des Torständers (13) ein Werkzeugschlitten (16) hydrostatisch gelagert und vertikal verfahrbar ist, und wobei in dem Werkzeugschlitten (16) ein von dem Werkzeugschlitten (16) umschlossener Schieber (17) hydrostatisch gelagert und horizontal zu dem jeweiligen Werkstück hin und von demselben zurück verfahrbar ist, an dem auf seiner zu dem jeweiligen Werkstück hin gerichteten Seite (18) die Vorsatzkopfaufnahme (9) zur Aufnahme von Werkzeugen oder Bohrund Fräs-Vorsatzaggregaten (22) vorgesehen ist, deren Zustellung horizontal zum Werkstück hin erfolgt.
Abstract:
L'invention concerne une unité de broche (1) comprenant un bâti (2), un arbre (4) muni à une de ses extrémités de moyens de serrage (14) pour serrer une pièce à usiner (16), ledit arbre (4) étant monté à rotation dans ledit bâti (2) et supporté radialement par l'intermédiaire de premier et deuxième paliers radiaux (6,8), ledit arbre étant entraîné à rotation par des moyens moteurs, ladite unité (1) comprenant en outre un troisième palier (18) disposé au-delà desdits moyens de serrage (14) et apte à guider ladite pièce à usiner (16) caractérisée en ce que les premier et deuxième paliers radiaux (6,8) sont des paliers hydrostatiques et en ce que le deuxième palier radial (8), situé du côté du troisième palier (18) , est agencé pour permettre audit arbre (4) ,dans la région dudit deuxième palier (8), un mouvement radial limité dans un plan perpendiculaire à l'axe de rotation de l'arbre (4), l'amplitude maximale dudit mouvement radial étant supérieure à celle de tout mouvement radial de l'arbre (4) pouvant être permis par ledit premier palier radial (6).
Abstract:
A hydrostatic bearing assembly is provided for a carriage and guide rail combination in wich the carriage (12) straddles and is guided by the guide rail (18). The guide rail (18) presents two outwardly facing parallel faces (24, 26) which cooperate with a pair of inwardly directed spaced apart hydrostatic pads (28, 38) which, in use, are spaced by a working clearance from the parallel faces (24, 26) of the guide rail (18). One of the parallel faces (26) is machined to a high level of precision alignment and flatness, and the hydrostatic pad (28) cooperating therewith is fixed relative to the carriage, but is adapted to exert gap control via a servo system so as to control the motion of the carriage (12) along the rail (18). The second pad (38) is movably mounted on the carriage (12) and cooperates with the other face (24) of the rail (18) only to apply a force thereto, i.e. without any gap control. Consequently, the motion of the assembly along the rail (18) is dictated by the flatness and alignment of the precision machine surface (26) of the rail (18). There is also shown a method of guiding a housing, such as the carriage (12), relative to a fixed structure (such as a bed (10)) by means of the rail (18) by applying hydrostatic fluid under pressure to the rear of the movable pad (38) of the hydrostatic assembly so as to force the latter towards the guide rail (18) whilst providing hydrostatic fluid and pressure through fluid flow restrictor means to pockets in the fixed brackets (28) and floating brackets (38).