Accession Number : AD0469254

Title :   EFFECT AND CONTROL OF CHATTER VIBRATIONS IN MACHINE TOOL PROCESS.

Descriptive Note : Final technical rept. 15 Sep 62-15 Mar 65,

Corporate Author : CINCINNATI MILLING AND GRINDING MACHINES INC OH

Personal Author(s) : Long, Gerald W. ; Kegg, Richard L. ; Lemon, Jason R.

Report Date : JUN 1965

Pagination or Media Count : 277

Abstract : A theory is formulated using a feedback loop to represent the chatter mechanism. This theory permits the calculation of borderlines of stability for a machine tool system having a structure with n-degrees of freedom. A cutting stiffness table is presented in which data from the literature are given in a form of cutting stiffness per unit width of cut for various materials. The dynamic behavior of the cutting process is explored in depth yielding an understanding and qualitative description of observed dynamic behavior. The theory of transfer functions of structures has been derived enabling the prediction of structure dynamics of simple continuous systems. Measured and computed stability diagrams are presented demonstrating the validity of the developed stability theory. From the research program initial chatter specifications have been formulated. Such a specification, if established, would define the ratio of minimum directional dynamic stiffness of the structure over the rated horsepower of the machine tool. (Author)

Descriptors :   (*MACHINE TOOLS, VIBRATION), (*CUTTING TOOLS, VIBRATION), MEASUREMENT, THEORY, STABILITY, RESONANCE, MECHANICAL WAVES, DRILLS, MILLING MACHINES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE