EFFECT OF TOOLING PARAMETERS ON THE RELATIONSHIP BETWEEN THE RADIATED NOISE AND INDUCED FORCE IN SHEAR CUTTING OF SHEET METALS

摘要

It has been shown theoretically by Evensen [1] that the noise radiated from impact forming operations is related to the time derivative of the force induced in the machine. In this paper, the validity of this theory is explored for a high speed sheet metal shearing process. Noise measurements were made for various shear blade tooling parameters, such as blade profile, blade clearance and speed of cutting, while dynamic cutting forces were measured simultaneously using a pressure transducer. Experiments include the cutting of profiled sheet metal products as well as flat sheets. The profiled specimens used for this investigation were roll formed sheet steel products with an approximately sinusoidal profile produced by BHP Building Products, Australia. For this product, eight different shear blade profiles of varying blade angles and rake were designed and produced. Comparison of experimental results with theory is discussed along with practical applications to the design of high speed sheet metal shearing operations with reduced radiated noise.