Turning – Lathe – Having facing tool fed transverse to work
Patent
1992-02-07
1994-05-03
Terrell, William E.
Turning
Lathe
Having facing tool fed transverse to work
82 12, B23B 326
Patent
active
053077148
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for holding and operating a facing head comprising a supporting body releasably fixable to a machine spindle, comprising a head element releasably fixable to the supporting body, comprising at least one slide movable essentially transversely with respect to the axis of rotation on the head element and carrying a tool or a tool carrier, comprising an adjusting mechanism having an axially movable actuator rod and a gear means converting the axial movement of the actuator rod into a transverse movement of the slide, and comprising a coolant channel arranged in the supporting body, connectable on an inlet side to a connecting opening to the spindle and terminating on the outlet side in the head element, and loadable with pressure fluid.
BACKGROUND OF THE INVENTION
Facing heads are primarily used for facing of workpiece surfaces to a high surface quality and for cutting during internal and external machining. In addition, there are facing heads as they are needed for example for the valve machining industry or spherical-turning heads for the axle or armature industry. Replacement attachment tools broaden the field of use of a facing head.
In a known device for holding and operating a facing head of the above-disclosed type (DE-C 2 608 930), the adjusting mechanism includes an actuator rod arranged coaxially movably with respect to the axis of rotation of the supporting body on helical tooth systems arranged on two diametrically opposite sides, the teeth which cross, however, in relationship to the direction of movement of the actuator rod have the same angle. Each of two serrated slats arranged symmetrically with respect to the actuator rod are provided on the slide and on a counterweight of the slide, which serrated slats mate with the helical tooth system on the actuator rod. The teeth on the serrated slats of the slide extend thereby in opposite direction of the ones of the serrated slats on the counterweight. In the place of the counterweight, it is also possible to provide a second slide movable in an opposite direction to the first slide. A cross-feed mechanism extending centrally through the machine spindle is needed to operate the actuator rod. The cross-feed mechanism has been constructed especially for this purpose and can be operated from the side of the tool. On the other hand, the center area of the machine spindle is occupied with a feed device for the tool in machining centers with an automatic tool replacement capability so that an additional cross-feed mechanism cannot easily be stored there. On the other hand, it would be of a great advantage, in the interest of a complete machining of workpieces in one setting, when facing heads could also be inserted into machining centers.
It is hereby conducive to use the fluid coolant existing in each machining center and circulated with a high pressure of at least 15 bar as a drive means for the cross slide.
Based on this, the basic purpose of the invention is to provide a device for holding and operating a facing head of the above-disclosed type, with which, using the coolant in particular also existing in machining centers and circulating it under pressure, a slide adjustment is assured which is reliable, also at high speeds, and suitable for continuous operation.
To attain this purpose the following combination of characteristics is suggested according to the invention: to the axis of rotation, in which chambers are arranged two pistons rigidly coupled with one another and to the actuator rod; pressure fluid from the coolant channel and on the other piston side with atmospheric air; piston arrangement is provided; hydraulic circuit which contains a check valve closing in machining direction of the slide movement and opening in return direction, and a flow-control valve.
The division into two separate hydraulic circulating systems makes it possible that in the open coolant circulating system also more or less contaminated coolant both for the cross-slide drive and also for the cooling and chi
REFERENCES:
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patent: 3824883 (1974-07-01), Wloszek
patent: 4224846 (1980-09-01), Eysel et al.
patent: 4412465 (1983-11-01), Wright
patent: 4982633 (1991-01-01), Jager
patent: 5101700 (1992-04-01), Muth
patent: 5120167 (1992-06-01), Simpson
Muendlein Werner
Stolz Gerhard
Komet Praezisionswerkzenge Robert Breuning GmbH
Terrell William E.
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