The dynamic behaviour of metal cutting process is investigated by measuring the Dynamic Cutting Force Coefficients. Measurements of eight components of the DCFC's are needed to describe completely the dynamics of metal cutting. This requires complex test apparatus and procedures, yet the experimental results are not very convincing. Investigations of the DCFC's for the inner modulation only, as recommended by Tlusty on CIRP in 1978, simplified the problem. A new method has been developed for measuring the inner DCFC's. The new method is based on Kal's idea who compared transient vibrations of a test rig in the cut with that outside the cut, which provides a direct assessment of the damping in the cutting process. New arrangements of the test and especially, the controlability of the damping of the rig itself leads to a qualitatively new situation permitting a high level of sensitivity and distinction of slight variations in the damping of the cutting process. The experimental results obtained by the new method are very convincing and are in a very good agreement with the general practical observations.

Master of Engineering (MEngr)

Thesis