Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1992-04-21
1993-10-05
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
408153, 408181, B23B 5100
Patent
active
052498956
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for setting the true running of a tool holder. Great importance is assigned to the true running of rotating tools. Precise true running results in a longer service life of the tools, particularly tools associated with milling, drilling and reaming, and accordingly results in fewer interruptions for changing the tools. Also, the tools need not be re-sharpened as often, so that the use of the tools is improved and costs are lowered. Deviations from true running lead to radially disruptive forces which not only damage the tools and cause increased wear, but also cause reduced dimensional accuracy of the work pieces to be processed. Accordingly, it is desirable to be able to set true running as accurately as possible.
2. Description of Prior Art
Up to now it has been attempted to produce holder bodies with highly accurate true running. Miscellaneous defects which are a function of the tool or which are created when clamping the tool have not been compensated.
Recently, holder bodies have been disclosed having a correction provided for compensating the deviation generated during clamping of the tool. This is accomplished with specially produced eccentric grinding of the conical holder body.
Also known are multi-part basic holders for setting true running following clamping of the tool. In addition to the relatively complicated adjustment of such multi-part basic holder bodies, stability is also effected in such structures.
SUMMARY OF THE INVENTION
It is therefore one object of this invention to provide a device in which true running of a one-piece tool holder can be set. In particular, it is intended that this setting take place at the machine itself, with the holder body installed and the tool in a clamped position.
This object is achieved with a device for setting the true running of a tool holder having a rotationally symmetrical holding body and a shaft forming one piece with an axially directed first annular groove that is concentric with the shaft and in a transition area between the holding body and the shaft. The shaft has an annular collar with a flank inclined in a direction toward the first groove. A rotatable clamping ring encompasses the collar and engages the first annular groove, and is seated on the shaft. The clamping ring has a second annular groove in which wedge-shaped sliding blocks are seated and are radially and axially moveable, but secured against canting within the second groove. The sliding blocks are supported on the inclined flank of the collar, and a pressure screw is threadedly engaged within the clamping ring.
If such setting is performed directly on the machine, all accumulated true running errors which result from the tool via the clamping cheeks and the receiver, including the steep angle tapered holder as far as the spindle bearing deviations, can be compensated. Particularly advantageous embodiments of this invention are set forth in the dependent claims and in the following specification.
BRIEF DESCRIPTION OF THE DRAWINGS
One preferred embodiment of this invention is shown in the drawings and explained in the following specification, wherein:
FIG. 1 is an axial, longitudinal sectional view of a tool holding fixture with a true running set device, according to one preferred embodiment of this invention;
FIG. 2 is a cross section taken along line A--A of FIG. 1; and
FIG. 3 is a side view of the clamping ring.
DESCRIPTION OF PREFERRED EMBODIMENTS
The tool holding fixture, essentially conventional in shape, comprises a rotationally symmetrical holding body 1 and a shaft 2 connected therewith. The holding body 1 and the shaft 2 form a one-piece unit, preferably machined from round bar steel. The holding body 1 is rotationally symmetrical and generally shown in the drawing as a steep angle tapered cone. It is apparent that any other rotationally symmetrical holder can be used in lieu of the steep angle tapered holder. For this reason, only a rotationally symmetrical holding body 1 w
REFERENCES:
patent: 2368846 (1945-02-01), Klomp
patent: 3041898 (1962-07-01), Better
patent: 3261236 (1966-07-01), Flannery
patent: 3379077 (1968-04-01), Gustafson
patent: 4776734 (1988-10-01), Buettiker et al.
patent: 4930957 (1990-06-01), Priessnitz
Howell Daniel W.
Planetron AG
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