Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1992-02-14
1993-11-02
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
408181, B23B 2904
Patent
active
052578810
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an insert for chip removing tools comprising a housing insertable into a recess of a tool base body, which recess is preferably constructed as a blind hole, a rotatably supported adjusting spindle which becomes fixed against movement by the action of an axial force in the housing, and a machining blade insert holder axially movably guided and fixed against rotation in the housing, the holder engaging with an adjustment thread thereon a thread on the adjusting spindle to facilitate axial movement by rotating the adjusting spindle, the holder carrying a machining blade insert on its head projecting beyond the housing.
BACKGROUND OF THE INVENTION
Inserts of this type can be inserted into recesses of boring tools and stationary chip-removing tools and can, when necessary, be easily replaced with other inserts. Since the recesses in the tool base body are in most cases designed as a toleranced bore or as a broached square opening, the machining blade insert holder is advantageously adjusted from the front faces of the recess. An adjusting from the blade side is thereby to be preferred in particular for rotating tools having a large diameter and for axially elongate tools.
In the case of an insert of this type (DE-PS 29 31 302) inserted into a blind hole of a boring head, the adjustment of the machining blade insert holder is done by rotating an adjusting element engaging with a threaded pin in a tapped hole of the machining blade insert holder to become axially lockable within the housing. However, a clearance free advancing of the machining blade insert holder is not possible with the known insert, since the clearance between threaded pin and adjustment thread cannot be eliminated. In order to eliminate the thread clearance, the machining blade insert holder must always be advanced in the same direction.
SUMMARY OF THE INVENTION
Starting out from this, the basic purpose of the invention is to provide an insert for chip removing tools, the machining blade insert holder of which can be fed clearance free.
The invention is based on the thought of pressing the adjusting spindle designed as a threaded sleeve in radial direction against the adjustment thread of the machining blade insert holder in order to eliminate in this manner both the radial clearance of the machining blade insert holder and also the axial thread clearance. The threaded sleeve is pressed against the adjustment thread according to the invention by varying the axial force with which the threaded sleeve is clearance free clamped in the housing. A radial through, essentially axially extending, slot in the thread area guarantees that the threaded sleeve rests with an initial force and clearance free against the adjustment thread. A clamping sleeve gripping around the threaded sleeve in the thread area and axially clamped between shoulders on the threaded sleeve and on the housing, which shoulders face one another, is elastically deformable by the action of the axial force and can thereby be radially pressed against the threaded sleeve.
Also the clamping sleeve can have several axial slots distributed over its periphery and which extend alternately in opposite directions.
The clamping sleeve rests according to a further preferred embodiment of the invention with tapered axially facing faces against an inside tapered surface arranged on the shoulder on the side of the housing and on the shoulder on the side of the threaded sleeve. The inside tapered surfaces can thereby each be formed by a bearing ring axially supported against the shoulders on the threaded sleeve and on the housing and radially against a bore surface in the housing.
A further preferred embodiment of the invention provides a threaded clamping ring threadedly received into an internal thread of the housing, which threaded clamping ring can apply through a ball ring an axial force axially against the threaded sleeve arranged in the housing. The threaded sleeve has thereby advantageously an annular flange, the front face of which, wh
REFERENCES:
patent: 3220288 (1965-11-01), Yogus
patent: 3434376 (1969-03-01), Benjamin et al.
patent: 3697187 (1972-10-01), Faber et al.
patent: 3741672 (1973-06-01), Hedberg
Dubbel Taschenbuch fuer den Maschinenbau-13th Edition, Authors: Sass, Bouche and Leitner Springer-Verlag Berlin Heidelberg New York 1970-pp. 680-683.
Howell Daniel W.
Komet Praezisionswerkzeuge Robert Breuning GmbH
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