Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1995-08-31
1998-01-20
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
407 9, 408158, 408181, B23B 2903
Patent
active
057095108
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a tool holder for inserts, particularly indexable throwaway inserts, having a holder shank, which can be fastened to an axis-parallel clamping face of a tool carrier with a contact face being passed through, preferably obliquely, by a tightening screw. The tool carrier preferably configured as a boring bar, having a holder head, which is formed on the front side onto the holder shank and which includes a recess open at the margin for the reception of the insert which is aligned essentially perpendicular to the contact face and protrudes on one side with an active tool nose beyond the outer face that is facing away from the contact face, and having a device for adjusting the distance between the clamping face and the active tool nose.
BACKGROUND OF THE INVENTION
In known tool holders of this type (Cartridges type A for indexable throwaway inserts according to DIN 4985), which are clamped in a tool carrier with one or two fastening screws extending through an oblique elongate hole in the holder shank, there is provided a cross-setting screw for the adjustment of the distance between the clamping face and the active tool nose, which setting screw extends through an internal thread of the holder head and is supported with its tip against the clamping face of the tool carrier. The handling involved in carrying out the adjustment here is extremely awkward since, first of all, the fastening screw has to be loosened, then the cross-setting screw adjusted in the desired direction and finally the fastening screw re-tightened. This adjustment has to be repeatedly performed, where necessary, until the desired measure is exactly set. Further, it is considered a drawback in this adjusting operation that the setting angle of the insert is altered upon the adjustment of the distance measure, which is particularly disadvantageous where exactly defined shoulders are intended to be turned. Added to this is the fact that the cartridge does not bear with its contact face squarely upon the clamping face of the tool carrier, but rather, in forming a gap, a clamping triangle is created, the rigidity and damping characteristics of which often leave a lot to be desired, particularly in heavy-duty machine-cutting operations. The cross-setting screw is relatively small and consequently has only a small, keytype engagement, which is vulnerable to wear, and a small end face inclined toward the notch in the tool body.
Starting from this basis, the object of the invention is to provide a tool holder of the type stated in the introduction, which, when the fastening screw is fastened, can be adjusted in its distance measure between the clamping face and tool nose, simply and without adjustment of the setting angle.
In order to achieve this object, the combination of features specified in patent claim 1 is provided. Advantageous designs and refinements of the invention derive from the dependent claims.
SUMMARY OF THE INVENTION
The solution according to the invention is based upon the concept that the holder shank can be clamped rigidly in the tool carrier and that the holder head, by the introduction of suitable predetermined bending points, is elastically bendable in the desired direction, relative to the holder shank, with the aid of a control member. In order to achieve this, the following combination of features is proposed according to the invention: shank, is provided with a gap-shaped aperture which passes through parallel to or obliquely to the contact face and which exhibits an arc-shaped cross-sectional contour which is open toward the holder shank and is limited by two spaced apart aperture ends enclosed in the holder head material, one of the aperture ends being disposed close to the contact face and the other aperture end being disposed close to the outer face of the holder head, in each case forming a thin-walled material bridge; elastically bendable relative to the holder shank, under the influence of a control member, essentially perpendicular to the contact face.
The ap
REFERENCES:
patent: 3827823 (1974-08-01), Lhomme
patent: 4343576 (1982-08-01), Logerholm et al.
patent: 4428704 (1984-01-01), Kalokhe
patent: 4780029 (1988-10-01), Beck
patent: 4786217 (1988-11-01), Johne
Howell Daniel W.
Komet Praezisionswerkzeuge Robert Breuning GmbH
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