CHATTER BEHAVIOR OF HEAVY MACHINE TOOLS.
Quarterly technical rept. no. 7, 1 Jul-30 Sep 67,
TECHNISCHE HOCHSCHULE AACHEN (WEST GERMANY) LABORATORIUM FUER WERKZEUGMASCHINEN UND BETRIEBSLEHRE
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On a medium-sized vertical milling machine systematic investigations have been performed to get deeper knowledge about the effects of several parameters upon the validity and reproducibility of the measured data. It was stated, that the most important condition is the position of the machine elements. Considerable variations of the static and dynamic compliance and of the natural frequency were observed for different positions of the table. These results show, that in general the static and dynamic behavior of a machine tool cannot be represented by the values measured in one medium position with sufficient accuracy. For studying the influence of the spindle rotation upon the measured dynamic values an electro-magnetic exciter has been developed. The theoretical base of this device is discussed. The results of dynamic tests on two unribbed column models are presented, showing that the dynamic behavior is considerably influenced by plate vibrations if the walls are not provided with wall ribbings. First measurements of damping coefficients are discussed as well. Author
- Machinery and Tools