Standard shank and method for directly locating rotating cutting tools in a machine tool work spindle

A standard shank for a rotating machining cutting tool for location in a cylindrical location opening, precisely produced with regard to shape and true-running accuracy, in one of a machine tool work spindle, and a location opening of a steep-taper adaptor which can be inserted into the work spindle comprising:

• a rotationally symmetric joining cylinder, precisely machined at a periphery thereof, ground on an end of a standard-shank which is adapted to be inserted into the location opening of one of the work spindle and the adaptor, in which the joining cylinder is only slightly undersized relative to the cylindrical location opening in the work spindle,
• cylindrical connection for securely fixing the cutting tool in the standard shank to provide for the highest possible true-running accuracy of the working surfaces of the cutting tool relative to the joining cylinder of the standard shank,
• the cylindrical press connection between the standard shank and the cutting tool being formed, on a side adjacent to the standard-shank by a cylindrical location bore machined to a defined diameter and, on a side adjacent the tool by a cylindrical tool shank, adapted in diameter to the location bore,
• the standard shank having a thin-walled clamping sleeve in the front axial area of the location bore which clamping sleeve is connected monolithically to a remaining portion of the standard shank and is provided at a periphery thereof with a cylindrical outer surface of defined outside diameter,
• a shrink collar of a shape-memory alloy configured to be pushed onto the clamping sleeve, an axial length of said shrink collar approximately corresponding to, at most, an axial length of the clamping sleeve, wherein
• the shape-memory alloy is selected with regard to its composition such that an its austenite finishing temperature thereof is below a working temperature, and
• the shrink collar is passed through manufacture-induced states including working an inner surface of the shrink collar facing the clamping sleeve, starting from an austenitic structural state, to a clear undersize relative to an outside diameter of the clamping sleeve so that high pre-tension theoretically results when the shrink collar is paired with the outer surface of the clamping sleeve, expanding the shrink collar, subsequently transformed by undercooling into a martensitic structural state, in the peripheral direction such that the diameter of the inner surface of the shrink collar in the martensitic structural state has a slight oversize relative to the clamping sleeve, and selectively displacing the shrink collar on the clamping sleeve.