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

US5277435A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Johann Kramer · Leonberg, DE
• Bruno Teusch · Eßlingen, DE
• Rainer Renz · Stuttgart, DE
• Dieter Jenuwein · Stuttgart, DE

Key dates

• Filing date: Aug 24, 1992
• Grant date: Jan 11, 1994
• Expiry date: Aug 24, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T409/30952
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A cylindrical standard shank is provided for rotating cutting tools for locating a standard shank in a cylindrical location opening, precisely produced with regard to shape and true-running accuracy, in the work spindles of so-called transfer lines or of, for example, steep-taper adaptors. The cutting tool is, in turn, fixed by a cylindrical press connection in the standard shank serving as an adaptor between the tool shank and standardized location opening. The standard shank has, at the front, a longitudinally slotted clamping sleeve accurately machined on the inside and outside. The clamping sleeve is clamped by an accurately machined shrink collar of shape-memory alloy which is approximately the same length and has at least the same wall thickness, is present in the austenitic structural state at room temperature and in the process is reduced in diameter on account of suitable pretreatment, and bears tightly against the periphery of the clamping sleeve. The shrink collar can be transformed into the martensitic structural state by undercooling and can thereby be widened in diameter, as a result of which the clamping sleeve is relieved and the cutting tool located in the standard…