Gear cutting – milling – or planing – Milling – With cutter holder
Patent
1995-03-03
1996-02-20
Briggs, William
Gear cutting, milling, or planing
Milling
With cutter holder
82160, 408239R, B23C 900, B23B 3100
Patent
active
054924413
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clamping device for connecting machine spindles or basic holders with tool holders or tools for the machining industry, with two partable clamping elements which are radially displaceably mounted in a holder anchored in the machine spindle or the basic holder and, in the parted position, engage behind an encircling shoulder inside the tool holder.
To fix tool holders or tools in machine spindles or basic holders, various radially partable clamping devices are known of. Examples are contained in EP-B 0 172 850 and WO 88/05358. The same applies with respect to tool holders with tapered hollow shanks according to DIN 69893. Where possible, clamping devices of this type ought to be able to be operated both automatically and manually.
A disadvantage of some of the prior art solutions is that the parted clamping elements essentially only engage behind the clamping shoulders of the tool holder at two opposite points. This means that the connection only has a high degree of rigidity along the axial plane which passes through the two points, whilst the rigidity where there are bending forces in directions outside the said plane can be insufficient.
It is virtually impossible to effect a uniform parting of more than two clamping elements at reasonable cost. If, on the other hand, the clamping elements are provided with arched clamping surfaces adapted to the ring shape of the clamping shoulder of the tool holder it is usually impossible to design the clamping shoulder, the clamping elements, the parting mechanism and the contingent arrangement of these parts with enough precision to allow the clamping surfaces to rest along their entire surface against the clamping shoulder with essentially uniform pressure. Thus the power transmission will, in this case too, take place entirely, or at least predominantly, via certain individual points, whose position the manufacturer cannot influence.
The invention is thus based on the task of creating a clamping device of the genetic type, which ensures that the power transmission between the machine spindle and the tool holder is distributed as evenly as possible over the periphery, thus ensuring a high degree of rigidity in the connection between the two.
In a clamping device of the aforementioned type, this task is solved according to the invention in that the clamping elements extend crosswise to the longitudinal direction of the tool holder and have clamping surfaces at the lateral-outer ends which are disposed such that all four clamping surfaces of the two clamping elements are each distributed over the periphery of the clamping shoulder at angular distances of approx. 90.degree..
The fact that each of the clamping elements has two clamping surfaces ensures that the clamping elements automatically adjust themselves on clamping such that essentially the same force is transmitted over both clamping surfaces. The same also applies for the distribution of force between the two clamping elements. Thus a very uniform distribution of the force transmitted over the periphery is achieved, and the rigidity of the connection is high.
A differential screw is preferably provided to part the clamping elements.
At one end the differential screw has a hexagon socket or another device for connecting a tool. The tool is introduced through aligned radial bores in the tool holder and the machine spindle.
The clamping elements are preferably radially displaceably mounted in opposite pockets in the holder. The pockets are connected via a radial through-bore in which the differential screw lies.
Because of the very flat taper which tool holders of this type usually have, the connection between the tool holder and the machine spindle is self-locking. Devices for ejecting the tool holder after the clamp has been loosened are therefore advantageous.
For this purpose, the clamping elements of this invention have sloped surfaces which, when drawn together, run up against axially parallel pins longitudinally displaceably disposed in the holder, which interact with the tool ho
REFERENCES:
patent: 2485799 (1949-10-01), Woytych
patent: 5150995 (1992-09-01), Reinauer
patent: 5243884 (1993-09-01), Haga et al.
patent: 5257884 (1993-11-01), Stolz et al.
patent: 5388936 (1995-02-01), Mihic
Briggs William
Gildemeister-Devlieg System-Werkzeuge GmbH
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