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AssigneeMafell-Saschinenfabrik Rudolf Mey GmbH & Co. KG
InventorsRudiger Haas, Ernst Krauss, Herbert Walter
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In uninterrupted and neat machining of a workpiece or material, particularly extremely hard material, with an ultrosonic tool is obtained by keeping constant or substantially constant the contact pressure between the tool and the worked surface. This is done, for example, by feeding the tool by means of a spindle sleeve which is mounted for displacement in a feed head. The other end of the spindle sleeve, remote from the tool, is designed as the piston of a feed mechanism. By keeping the pressure P1 in the cylinder space above piston, or the volume of this cylinder space, constant, the contact pressure of the tool remains constant as desired. Since the piston displaced during the matching operation, this displacement must be determined, by means of a displacement pickup, for example. Through a very sensitive contact pressure control on a feed head of the working machine, to which the cylinder of the feed mechanism is secured, can be moved to keep the volume of or pressure in the cylinder space constant.
A method of machining a workpiece by means of ultrasound using an ultrasonic machine having a tool head for movement toward and away from the workpiece on a feed path, and an ultrasonic machine tool mounted for movement on the tool head and with respect to the tool head toward and away from the workpiece on the feed path, comprising feeding the tool head on the feed path toward the workpiece to establish a contact pressure between the machine tool and the workpiece which is maintained substantially constant, measuring an instantaneous absolute displacement of the machine tool on the tool head in the feed path and from a zero reference point as the machine tool penetrates the workpiece to form a displacement signal corresponding to the instantaneous absolute displacement, using the displacement signal to feed the tool head so as to maintain the substantially constant contact pressure between the machine tool and the workpiece, and repositioning the machine tool to its zero reference point on the tool head by moving the machine tool along the feed path.
A device for machining a workpiece by means of ultrasound, comprising a tool head, a spindle sleeve mounted for displacement on the tool head in a direction toward and away from the workpiece on a feed path, an ultrasonic machine tool connected to said spindle sleeve for movement on the feed path, a displacement pickup engaged between said tool head and said spindle sleeve for measuring relative displacement between said spindle sleeve and said tool head on the feed path, first feed means operatively connected to said tool head and being connected to said displacement pickup for receiving signals from said displacement pickup, said first feed means being operatively connected for moving said machine tool toward the workpiece at a rate to maintain a substantially constant contact pressure between the machine tool and the workpiece, and second feed means connected between said tool head and said machine tool for repositioning said machine tool to a reference zero position on said tool head.
Dependencies are inferred from the claim text.