Abstract:
Research has been carried out on the effect of different blade profiles on
the radiated noise of an experimental high-speed sheet metal shear. The
specimens being cut were roll formed sheet steel products of an approximately
sinusoidal profile produced by BHP Building Products, Australia. For this
product, five different shear blade profiles of varying blade angles were
designed and produced. In the tests, three parameters, i.e., blade angle, speed
of cutting and blades alignment, could be varied independently. A pressure
transducer was used as a measure of cutting force, allowing an investigation of
the relationship between radiated noise and the time history of the cutting
force. Results show that the blade angle in shear cutting is of great
significance for the reduction of the radiated noise. Speed of cutting was found
to have a significant but lesser effect. Blade misalignment gave some advantage
when the blade angle was less than 0.5 degrees. [sup