Gear cutting – milling – or planing – Milling – With cutter holder
Patent
1996-06-24
1998-07-07
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With cutter holder
279143, 408143, 408239A, B23B 3100, B23C 526
Patent
active
057758573
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for holding tools or the like.
2. Description of the Prior Art
A tool holder is known (German reference DE 34 36 733 C2) in which a part referred to as clamping pin consists of a substantially cylindrical shank having a flange and of a so-called conical pressure sleeve placed thereon and forming a guide surface on its outer side. This sleeve is to be held immovably between the flange and a securing element on the rear end of the shank. The sleeve has a conical outer surface which is adapted to the conical bore of a spindle head, said surface fitting in form-locked manner within the conical bore. At the larger end of the conical pressure sleeve there are annular grooves that form a region of elastic deformation which lies on the flange of the shank. Upon the clamping of a tool, a tightening mechanism acts on the shank. The flange is applied, upon an axial movement, against the end surface of the spindle head. In this position of application, the conical pressure sleeve is to be pressed axially by the flange, whereby its region of deformation is bulged and so deformed within the conical bore of the spindle head that a radial component of force acts on a cylindrical collar on the shank so as to center the tool. There are contradictions and opposing demands with this device which cannot be satisfied simultaneously.
SUMMARY OF THE INVENTION
Therefore, the present invention is directed at the problem of creating a device for holding a tool or a tool holder or the like which, while suitable for automatic tool replacement, is of great stiffness and at the same time has a high accuracy of concentricity. The tool holder should be able to offer advantageous properties, such as are desired in a new standard, even in embodiments in accordance with previously applied standards without changes in spindles and tools having to be effected. Other problems inherent herein with which the invention is concerned will become evident from the description of the preferred embodiments.
In a tool holder device of the aforementioned type, the invention provides that a flange part having an annular surface intended for flat application consists of a piece having a sleeve body which can be inserted into the receiver and which, with an outer shape which is adapted to the shape of the receiver, has as at least one elastic portion capable of bearing a load which is located between a region adjacent to the flange part and a region adjacent to its rear end.
Such a tool holder is characterized by a number of important advantages. Upon the insertion of a work spindle or another machine part into the receiver, there is obtained, with dependable flat application, a clamping of the work spindle in the receiver, merely by the build-up of pressure and without disadvantageous movements. Even in the case of thermal strains, excellent radial contact is maintained. Extremely favorable actions of force are obtained without an interlocking such as is necessary in other tool holder. With the invention there is thus created an interface, i.e. the connection between a conical part and a receiver, in particular of the spindle of a machine tool, which satisfies even high demands as to accuracy and stability. The hollow-shank design in accordance with the new standard which has been arrived at after lengthy investigations and consultations requires fundamentally changed developments not only with respect to the tool but of course also on the part of the machine, which means a corresponding expense and new purchases. The invention affords advantages which are obtained by the hollow-shank interface for the previously customary interfaces which are used in large number, particularly ones with a steep cone, without new parts or even merely modifications on the machine side being necessary for this.
By an elastic load-bearing part of the sleeve body there are to be understood all embodiments which make it possible, with fixed flat application of the flange part conn
REFERENCES:
patent: 4863323 (1989-09-01), Glaser
patent: 5030047 (1991-07-01), Pfalzfraf
Howell Daniel W.
Johne & Co. Prazisionswerkeuge GmbH
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