US 5,307,714 AGranted

Device for holding and operating a facing head

AssigneeKomet Praezisionswerkzenge Robert Breuning GmbH

InventorsWerner Muendlein, Gerhard Stolz

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Abstract

The device of the invention has a supporting body detachably fixed to a machine spindle, a head element detachably fixed to the supporting body, and at least one slide which can be moved substantially at right angles to the axis of rotation of the head element and which carries a tool or tool carrier. The radial motion of the slide is produced by the action of an axially moving actuator rod and gear means. In addition, there is in the supporting body a coolant channel for hydraulic fluid. The inlet end of the channel is connected to an opening in the spindle and the outlet opens out in the head element. For the operation of the slide, the supporting body has two cylindrical bores disposed coaxial to the axis of rotation and a certain distance apart and in which two rigidly linked pistons are located which can be connected to the actuator rod. In the first of the two cylinder, one side of the piston is acted on by hydraulic fluid from the coolant channel, the other side of the piston being acted on by atmospheric air. A return spring acts against the force exerted by the hydraulic fluid on the piston assembly. The second cylinder is connected up on both sides of the piston to a closed hydraulic circuit which includes a non-return valve which opens in the return direction and closes in the direction of the slide motion, plus a flow-control valve for fluid-feed and fluid-return control.

In a device for holding and operating a facing head including a supporting body releasably fixable to a machine spindle, a head element releasably fixable to the supporting body, at least one slide moveable in a machining direction and a return direction essentially transversely with respect to an axis of rotation of the head element and supporting a tool or a tool carrier thereon, an adjusting mechanism having an axially movable actuator rod and a gear means for converting an axial movement of the actuator rod into a transverse movement of the slide, and a coolant channel arranged in the supporting body and connected on an inlet side to a connecting opening of the machine spindle and terminated on an outlet side in the head element and having a pressure fluid contained therein, wherein the improvement comprises:

first and second chambers axially spaced from one another and coaxial with respect to the axis of rotation;
first and second pistons disposed within respective ones of said first and second chambers, said pistons being rigidly coupled together by a piston rod extending therebetween and being coupled to the actuator rod;
said first piston dividing said first chamber into first and second axially spaced cavities disposed on opposite sides of said first piston, said first cavity being remote from said second chamber and communicating with the outlet side of the coolant channel to receive the pressure fluid therefrom, the second cavity communicating with atmospheric air;
said second piston dividing said second chamber into third and fourth axially spaced cavities disposed on opposite sides of said second piston, said fourth cavity being remote from said first chamber and having a return spring axially disposed therein, said return spring acting against the force of the pressure fluid in said first cavity;
and
a closed hydraulic circuit having first and second paths communicating with said third and fourth cavities, respectively, said hydraulic circuit including a check valve which is closed during movement of the slide in the machining direction and open in the return direction of the slide, and a flow-control valve connected in parallel with said check valve.

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Abstract

Claims23