Gear cutting – milling – or planing – Milling – With cutter holder
Patent
1996-06-10
1997-12-16
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With cutter holder
82160, 279905, 279 223, 408240, B23B 3102
Patent
active
056977409
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/DE 94 01 337 filed 8 Nov. 1994 and based, in turn, upon German national application P43 38 953.8 of 15 Nov. 1993 under the International Convention.
The invention relates to a chucking fixture for connecting a tool head and a tool holder to a machine tool via a cylindrical or at least partially conical location hole and a correspondingly shaped centering pin, wherein chucking elements can be moved from the inside to the outside of recesses during the chucking process by means of a rotatable chucking shaft equipped with helical guides, whereby the tool head and the tool holder can be secured by means of friction and positive interlocks.
BACKGROUND OF THE INVENTION
A chucking fixture of the type described is disclosed in EP 0 369 211 B1. Only a very short chuck travel is required for chucking, whereby the travel of the chucking elements is initially relatively large due to a steep inclination of the chucking cams, while the high chucking forces required are applied in a second, substantially flatter portion of the chuck cam.
DE 35 24 739 A1 discloses a chucking fixture with a conical shank for a tool holder, which tool holder is detachably arranged in a conical location hole of a tapered socket fastened in a chucking cylinder. The location hole has a groove into which balls can be inserted as chucking elements by means of a pull ring to which an axial pressure can be applied, this ring being arranged slidably in a tapered socket. A stop ring is located at the back section of the tapered socket so that the rear position of the pull ring can be fixed by means of a stud. Between this stop ring and an additional stop ring for the back section of the tie rod, there is a pressure spring for moving the pull ring and the tie rod in axial direction. A ring through which the tie rod can pass and against which the pressure spring is braced serves this purpose. The disadvantage of the above-described fixture is its costly and complex design.
OBJECT OF THE INVENTION
The object of the present invention is to provide a chucking fixture of the type described in the introduction so that even with short chuck travel and a compact design, secure chucking is possible even when the parts of the chucking fixture have dimensions which deviate significantly from the nominal dimensions for which the device is intended.
SUMMARY OF THE INVENTION
This object is achieved by means of a chucking fixture of the type generally described above, but wherein the chucking shaft has at least one stop to limit the angle of rotation during chucking and the holder for the chucking elements is elastically prestressed in the tool holder. Due to this preliminary stress, the holder can deflect axially during chucking, compensating for dimensional irregularities of the parts of the chucking fixture. The stop is a simple means to prevent damaging of the chucking elements, which is always a risk when chucking a tool without the use of a torque wrench or if excessive chucking force is applied.
The holder for the chucking elements is preferably prestressed by means of a tension spring, in particular a Belleville spring washer or packet of Belleville spring washers. Because of their low friction, balls are well-suited for use as chucking elements, which are arranged in a canister as a holder. A compact design can be achieved, when the chucking shaft is located in a bore in the tool holder, oriented radially with respect to the common longitudinal axis of the location hole and the centering pivot in the tool holder.
There are a number of possibilities for the limit stop. The chucking shaft can have a head having a semicircular groove cut into its outside surface, in which groove the pin of the tool holder is guided so that the end faces of the groove represent stops to define the angle of rotation of the chucking shaft. Alternately, the guide of the chucking shaft for the chucking elements can have a dome-shaped trough or troughs whose radius/radii has/have been modi
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Huchon Rene
Tack Hans
von Haas Rainer
Dubno Herbert
Howell Daniel W.
Kirkman Christopher
Widia GmbH
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