Turning – Radially moving rotating tool inside bore
Patent
1992-02-21
1993-10-12
Terrell, William E.
Turning
Radially moving rotating tool inside bore
408 16, 408152, 408153, 408179, 408181, B23B 2506, B23Q 1722
Patent
active
052515117
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a tool head for use in machine tools comprising a main body rotating about an axis of rotation, at least one slide adjustable relative to the main body, preferably perpendicularly with respect to the axis of rotation, and equipped with at least one cutting tool, a device for the direct measuring of the displacement path of the slide relative to the main body and a device for evaluating and displaying the results of the path measurement.
BACKGROUND OF THE INVENTION
In order to be able to exactly adjust the slide and the cutting tool carried by it, it is necessary to exactly measure the displacement path of the slide. The displacement path is mostly measured indirectly in known tool heads by, for example, measuring the angular path of a spindle driving the slide and concluding from this the stretch covered by the slide. Inexactnesses in the path measurement are thereby created due to unavoidable tolerances which have negative effects on the exact position of the cutting tool and the reproducability of the adjustment.
In order to avoid this disadvantage, it is already known, for a tool head of the above-disclosed type (DE-OS 35 26 712), to measure the displacement path of the slide relative to the housing directly through an optical scanning of an incremental glass measuring rod fixedly connected to the slide by a sensing head arranged in the main body. The measuring light for the optical scanning of the measuring scale is thereby guided through a photoconductor from outside into the inside of the tool head. The light signals from the glass measuring rod on the scanning element are also introduced into a further measuring light conductor connected to an evaluating electronics device arranged outside of the rotating main body for evaluating the results of the path measurement. Because of the relatively complicated optoelectronic connecting technique, handling of the known tool head is complicated and cannot easily be automated. In addition, the reading of the results of the path measurement requires a stationary installation so that the use of the known tool head is limited to certain machine tools containing this installation.
Starting out from this, the basic purpose of the invention is to provide a tool head of the abovementioned type which can be universally utilized and guarantees a breakdown-free and exact displacement path display.
The solution of the invention is, among others, based on the recognition that a universal use of the tool head is only possible when the measuring and evaluating electronics device for the direct displacement path measurement is moved inside of the main body and the particularities of the operation on high-speed machine tools are considered.
Thus, a first modification of the invention suggests that the main body has a recess for receiving a battery-operated scanning and evaluating electronics device and a radially outwardly facing digital display and that the electronics device in the recess is sealed off at its periphery by a shell completely surrounding the main body, and having a viewing window for the digital display.
The shell can thereby be designed as a metal sleeve shielding the electronics device, which shell in the area of the digital display has a window opening and is lined on its inside surface with at least one annular acrylic-glass layer. The acrylic-glass layer can be glued to the metal shell or it can be injection molded into same. Furthermore, it is advantageous for the handling of the adjusting mechanism when preferably in the area of the window opening at least one externally accessible operating switch for controlling the scanning and evaluating electronics device in the shell is provided and which is externally sealed off against liquid. With the operating switch it is possible, for example to release the functions of a zero position or effecting a changing over between different measuring systems (metric measurement or inch measurement). Such a tool head suffices completely without external devices and
REFERENCES:
patent: 4672868 (1987-06-01), Rawle
patent: 4676127 (1987-06-01), Watanabe
patent: 4741230 (1988-05-01), Bohner et al.
patent: 4742738 (1988-05-01), Strand
patent: 4913602 (1990-04-01), Peter et al.
Muendlein Werner
Scheer Gerhard
Stolz Gerhard
Komet Praezisionswerkzeuge Robert Breuning GmbH
Terrell William E.
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