Abstract:
A device for regulating the distance from the ground of a working unit of an agricultural machine is proposed which comprises a position sensor (11) and a pressure sensor (10) for detecting the position of the working unit (2) relative to the machine. The sensor signals are evaluated as actual signals in a regulating device (7). In order to track the working unit in an optimum manner to ensure that the cutting height is constant, a ground distance sensor (9) - preferably an ultrasound sensor - is provided which measures the distance between the ground and the working unit (2) in a contactless manner. In this respect, the position signal detected by the position sensor (11) and the position signal detected by the ground distance sensor (9) are each evaluated within predetermined limits either individually or together in the regulating device (7), and in the area close to the ground only the output signal of the ground distance sensor (9) is used as the actual signal for the regulating process.
Abstract:
A machine tool (1) for precision micro-milling and/or drilling comprising : at least one working head (2) with a tool-holding spindle (3) driven along a third axis (Z) and moveable along it by means of a depth actuator (6) under computerised digital control towards and away from the piece to be machined, as well as first detector means (7) to detect the relative position of the spindle (3) along the third axis (Z) with respect to an origin, said head (2) including second detector means (11) to detect the surface of the workpiece and consequently activate said depth actuator (6), said second detector means (11) comprising a tracer device which continuously traces the surface of the workpiece to be machined close to the tool (5).
Abstract:
A system and method for measuring a distance to a target work surface to precisely position a tool assembly coupled to an actuator. The method includes measuring a distance to a work surface using a distance sensor, moving the tool assembly into an approach position, the approach position being adjacent to a location on the work surface. The tool assembly is then moved from the approach position to the location on the work surface pursuant to a soft landing procedure. The soft landing procedure may include determining that the tool assembly has moved into soft contact with the target work surface. Methods also include topologically mapping a work surface, comparing map data to predefined data, and adjusting a positioning routine. Additionally, methods include optimizing actuator movements to timely measure distances from a distance sensor to a location on a work surface with minimal actuator movement.
Abstract:
A mobile boring tool of this type is secured to a place to be bored of a large workpiece and is used for carrying out precision boring operations by means of a tool through which a liquid lubricant is supplied to the tool cutters. The tool has a tool spindle (1) with a tool holding fixture (2) through which lubricant is supplied, as well as a drive for rotating and axially advancing the tool spindle. In order to increase machining precision and improve lubricant dosage, the boring tool has besides the rotary drive (15) a separate drive (25) for advancing the tool spindle, as well as a measurement system (24) for sensing the advance distance. The advance drive (25) is controlled by a computer depending on the axial advance distance, so that the tool spindle is driven by the rotary drive at a predetermined on-load speed of rotation or load torque. Lubricant supply is controlled depending on the predetermined on-load speed of rotation or load moment and on the advance distance.
Abstract:
Eine Vorrichtung zur Überwachung der Relativposition und/oder zur Vermessung und Auswertung von Relativpositionen bei einem System, das mindestens zwei Subsystemen enthält, wird bereitgestellt . Die Vorrichtung weist mehrere Einrichtungen (20, 30) auf, von denen zumindest eine Einrichtung (20) eine Schwingungsisolationseinrichtung (2, 3) aufweist. Weiterhin ist zumindest eine Einrichtung (9) zum Bestimmen der Relativposition der Einrichtungen (20, 30) und eine Auswerteeinrichtung (40) zum Prüfen, ob die gemessene Relativposition der Einrichtungen (20, 30) innerhalb eines Toleranzintervalls liegt, vorgesehen.
Abstract:
The aim of the process and associated device is a substantially more accurate correction of dynamic misalignments caused unavoidably by vibrations in the machine than is possible with known processes. In the process, the disturbances which directly determine the misalignments at the point of action between tool and workpiece are determined. A mathematical process model is generated from the disturbances and used to generate the non-statistical components of the disturbances. On the basis of the process model, a preliminary estimate is formulated of the future behaviour of the disturbance at the point of action and this is then used to correct the misalignment. The process can be used with machine tools to improve surface finish.
Abstract:
The aim of the process and associated device is a substantially more accurate correction of dynamic misalignments caused unavoidably by vibrations in the machine than is possible with known processes. In the process, the disturbances which directly determine the misalignments at the point of action between tool and workpiece are determined. A mathematical process model is generated from the disturbances and used to generate the non-statistical components of the disturbances. On the basis of the process model, a preliminary estimate is formulated of the future behaviour of the disturbance at the point of action and this is then used to correct the misalignment. The process can be used with machine tools to improve surface finish.