Erosonic Ag

Dürr Dental Gmbh & Co. Kg

Hans Bauer

Michael Bory

A carriage 3 is movable in a feed direction A on guideways 1, and carries an ultrasonic machining device 4, 5 loaded with an adjustable force in the feed direction by a first fluid cylinder 7. A cylinder 15 is attached to the carriage, around which is looped 16 a rope 17. One end 18 of the rope is preloaded by spring 20 against a stop 21 which is attached to a frame 2. The other end 22 of the rope is attached to the piston rod 24 of a second cylinder 25. By means of the second cylinder the tool 5 can be lifted or retracted from the workpiece 6 during the machining operation, independently of the position of the carriage. After the tool has been lifted off, the tool touches down gently again on a renewed abrasive layer.

Apparatus for retracting a tool slide of an ultrasonic cutting machine

An ultrasonic machining device 10 is attached to a movable carriage 3, and has a borehole 11 to whose free end a differential screw 14 is threaded. To clamp a tool 20, first the device is returned to a neutral position whereat a wrench 25, which is mounted stationarily in a frame 2, engages the differential screw which rests on a shoulder of the wrench with low prestress. The wrench is then rotated until the screw projects a specific amount beyond the end of the device. The tool is then threaded onto the screw until it abuts the device 10, and finally the screw is tightened by a pneumatic cylinder 32.

Method and apparatus for clamping a tool in a metal cutting machine

An annular sonotrode 5 vibrates at one of its natural frequencies, preferably about four nodes 33-36 equally distributed over its circumference. The vibrations introduced at the input 17 along axis 10 are outputted to a tool 6 along an axis 19 bent by 90.degree.. With this design even difficult to access workpieces can be efficiently machined with ultrasonics.

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Wattwil, Switzerland

Hans Bauer