Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support
Patent
1991-11-01
1993-02-23
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
407 44, 408713, B23B 5100
Patent
active
051884909
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a tool for use in machine tools with a cutting head and at least one interchangeable cartridge releasably fastenable on the cutting head and carrying an insert, preferably constructed as an interchangeable plate, which interchangeable cartridge can, under the action of an adjustment mechanism, be adjusted on the cutting head in advance direction of the insert.
BACKGROUND OF THE INVENTION
Tools with adjustable interchangeable cartridges can relatively easily be adapted to different workpiece dimensions and machining tasks and can therefore be utilized more universally than special tools with nonadjustable inserts. This advantage has mainly an effect on small and medium workpiece series such that few universal tools are sufficient and that a plurality of special tools need not be manufactured and kept in storage. On the other hand, the adjustability and the thus needed division of the tool into several parts causes difficulties with respect to stability and strength, which could often not be satisfactorily solved with the presently known jointed structures in order to meet high performance requirements. Thus, it has already been suggested to adjust the interchangeable cartridge with the help of an adjusting screw guided in advance direction of the cutting head and resting loosely against an edge of the interchangeable cartridge to the desired cutting depth, and to thereafter clamp same on the cutting head with the help of a fastening screw. A tilting moment (or torque) is applied during the machining operation around the rearward bearing edge of the interchangeable cartridge at the cutting head, which bearing edge is adjacent to the main cutting edge, through the insert onto the interchangeable cartridge. The tilting moment must be completely absorbed by the fastening screw since the adjustment screw does not contribute anything toward absorbing this tilting moment. One must add that in the case of a rotating tool the centrifugal forces acting on the interchangeable cartridge of the known tool also must be absorbed exclusively by the fastening screw. Both types of stress reduce the stability particularly at the high speeds desired today.
SUMMARY OF THE INVENTION
Starting out from this, the basic purpose of the invention is to take steps, with which the forces and moments acting on the interchangeable cartridge during the machining operation, can be introduced better than up to now into the cutting head, and thus the total stiffness of the tool of the above-disclosed type can be increased.
The invention is based on the thinking that the adjustment mechanism, which rests regularly with an edge opposite the edge of the insert against the interchangeable cartridge, must in addition be constructed such that through it torque acting on the interchangeable cartridge and resulting from the cutting force can be transferred to the cutting head while relieving the fastening means holding the interchangeable cartridge on the cutting head. In order to achieve this, the invention suggests the following combination of characteristics:
The adjustment mechanism has a tapered ram which is movable along a guide on the cutting head, which guide is aligned parallel with respect to the insert plane and essentially transversely with respect to the advance direction;
The tapered ram rests with a tapered surface, defining an acute angle with its direction of movement and forming an inclined tapered surface, flat against an inclined shoulder on the interchangeable cartridge, which inclined shoulder deviates, in direction of the inclined tapered surface, from a right angle with respect to the advance direction;
The inclined shoulder and the opposing tapered surface have, in addition, and transversely with respect to the inclined tapered surface, an undercut forming an interlock between the interchangeable cartridge and the tapered ram.
The inclined shoulder and the opposing tapered surface have, according to a preferred embodiment of the invention, transversely with respect to the
REFERENCES:
patent: 3195376 (1965-07-01), Bader
patent: 3295187 (1967-01-01), Plummer
patent: 3782849 (1974-01-01), Mizoguchi
patent: 3839772 (1974-10-01), Shimomura et al.
patent: 3847555 (1974-11-01), Pegler et al.
patent: 4043697 (1977-08-01), Eckle
Muendlein Werner
Scheer Gerhard
Howell Daniel W.
Komet Stahlhalter-und Werkzeugfabrik Robert Breuning GmbH
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