Gear cutting – milling – or planing – Milling – With cutter holder
Patent
1994-05-31
1997-02-04
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With cutter holder
279 83, 408239R, B23C 526
Patent
active
055991467
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for connecting two tool parts to a shaft projecting from a first tool part and an annular surface surrounding the shaft at its root and with a coupling sleeve projecting from a second tool part having a recess for receiving the shaft and an end surface, which can be pressed against the annular surface, which coupling sleeve as various means for assisting connection
The coupling device of the invention is designated for both the releasable coupling of tools to a machine spindle (cutting point) and also the connecting of tool parts among one another (separating point). The term "tool parts" will refer to those structural parts which have either a shaft with an annular flange or a coupling sleeve with a recess and end surface, thus in particular tool heads, extending and reducing pieces, adjusting heads, spindle attachment flanges and machine spindles.
BACKGROUND OF THE INVENTION
Coupling devices of this type are known (WO 91/03347), in which a one-part or multipart clamping bolt is movably arranged in a crossbore of the pin and having an inner or outer cone at its end and two holding screws guided in diametrically oppositely lying internal threads of the coupling sleeve, having an outer or inner cone facing toward the inside of the sleeve, and clamped with the clamping bolt during the clamping operation are provided, with the clamping bolt and the holding screw having an axial misalignment effecting during the clamping operation the pulling of the pin into the recess and the reciprocal pressing of the annular surface against the end surface. The clamping operation is released in the case of these devices, for example, by screwing in the holding screw (clamping screw) provided with the outer cone. If abutment occurs during screwing in of the clamping screw, then the forces introduced through the screw occur first on the side of the clamping screw on the clamping bolt. The clamping bolt is thereby first pressed on the side of the clamping screw against the crossbore base facing the end of the shaft such that the shaft is pulled into the recess. This occurs immediately thereafter also when the clamping bolt outer cone contacts the inner cone of the oppositely lying holding screw. As soon as a specific clamping action has occurred, a complete transformation of the radial forces into an axial component pressing the annular surface of the fitting pin and the end surface of the coupling sleeve against one another takes place. With this type of clamping a reinforcement of the connecting device in direction of the bolt results preferably.
It is furthermore known in a coupling device of the mentioned type (WO 91/03347) to design the clamping bolt in two parts and to release the clamping operation with a sliding wedge arranged between the two clamping-bolt parts and which can be axially operated through a pulling-in device arranged on the side of the machine. Here too takes place during the clamping operation a clamping of the clamping bolts provided with an outer cone and of the holding screws arranged in an internal thread of the coupling sleeve and having an inner cone. The reinforcement of the connecting device occurs here also preferably in direction of the clamping bolts.
In order to increase the resistance to bending transversely with respect to the clamping-bolt axis and in addition in order to improve the changing exactness and the dampening behavior, it is there furthermore suggested to create a four-point bearing between shaft and recess in two directions which are perpendicular to one another. In order to achieve this, the coupling sleeve is elastically expanded during the clamping operation in axial direction of the clamping bolt such that it is pressed in transverse direction thereto under an elastic reduction in diameter in diametrically oppositely lying areas with the inner surface of the recess against the upper surface of the shaft. By suitably selecting the wall thickness and the outside and inside tolerances of the shaft and of the couplin
REFERENCES:
patent: 5238341 (1993-08-01), Horsch
patent: 5257884 (1993-11-01), Stolz et al.
patent: 5388936 (1995-02-01), Mihic
Howell Daniel W.
Komet Praezisionswerkzeuge Robert Breuning GmbH
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