Turning – Radially moving rotating tool inside bore
Patent
1994-11-03
1997-08-12
Briggs, William R.
Turning
Radially moving rotating tool inside bore
408 11, 409208, B23Q 1722, B23B 2506
Patent
active
056554222
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a tool head for use in machine tools, having a main body rotating about a rotational axis, having at least one slide, which is adjustable relative to the main body, preferably transversely to the rotational axis, and can be armed with at least one cutting tool or a tool carrier, having a device, comprising a measuring scale and a sensor, for directly measuring the path of adjustment of the slide relative to the main body, and having evaluating electronics for the evaluation or display of the path-measurement findings, the measuring scale and the sensor being disposed, in the form of measuring structures, in such a way on a surface of a respective flat substrate plate connected to the slide and main body respectively, which substrate plate is preferably made of glass, ceramics or metal, that the surfaces exhibiting the measuring structures are aligned in displacement planes which are separated from one another by a gap and run parallel to one another.
BACKGROUND OF THE INVENTION
A tool head of this type is known (WO91/03345), in which those surfaces of the substrate plates exhibiting the capacitive measuring structures are disposed in centrifugally neutral arrangement, in the direct proximity of the rotational axis, in planes running perpendicular to the rotational axis. The first substrate plate is herein flatly connected, by its surface opposing the measuring structure and pointing axially outwards, to a bearing face of the slide, whilst the second substrate plate is stuck, by its surface exhibiting the measuring structure, against two mutually spaced mounting strips, the measuring structure being left free, which mounting strips are fastened, by their free ends projecting over the edge of the substrate plate, to an axially aligned mounting face of the main body, whilst the substrate plate engages in a central recess in this mounting plate. The effect of this fastening method is that that surface of the substrate plate which bears the measuring structure lies exactly flush with the mounting face of the main body. This arrangement is only however possible if the substrate plates are disposed in centrifugally neutral arrangement. There are however tool designs in which, because of central built-in elements, for example, a centrifugally neutral arrangement of the substrate plates is not possible. In the case of an eccentric arrangement of the substrate plates, the known measures, because of the centrifugal forces acting upon the substrate plates, cannot be adopted. Added to this is the fact that, especially in the use of ceramic substrate plates, measurement tolerances of .+-.100 .mu.m in the wall thickness can occur, which, in the previously known arrangement, cannot be readily compensated, considering that the gap width between the active surfaces of the substrate plates, in capacitive measuring structures, must necessarily measure only 10 to 20 .mu.m.
SUMMARY OF THE INVENTION
Starting from this prior art, the object of the invention is to develop a tool head of the type defined in the introduction, which, despite an eccentric arrangement of the substrate plates bearing the measuring structures, enables the path of adjustment to be exactly measured and tolerances to be equalized.
The solution according to the invention is based upon the notion that those surfaces of the substrate plates which exhibit the measuring structures are disposed in eccentric tangential planes running parallel to the rotational axis, that the radially inner substrate plate is connected, by its surface opposing the measuring structure and pointing radially inwards, to a bearing structure on the slide side, that the radially outer substrate plate is supported by a bearing structure on the main body side, and that the bearing structure on the slide and/or main body side is formed by a surface segment of the slide or main body, which surface segment can be matched by surface coating or surface abrasion on the basis of the gap width and/or plane-parallelism to be set.
Alternatively,
REFERENCES:
patent: 4067251 (1978-01-01), Eckle et al.
patent: 4676704 (1987-06-01), Donnini et al.
patent: 5251511 (1993-10-01), Muendlein
Scheer Gerhard
Stolz Gerhard
Briggs William R.
Komet Praezisionswerkzeuge Robert Breuning GmbH
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