MANUFACTURING METHODS FOR IMPOSED HIGH FREQUENCY VIBRATION SYSTEMS.

摘要

Vibrations from 60cycles to 40,00cycles per second were investigated for possible application to grinding. Direct vibration of the part being ground and vibration of the grinding wheel itself were used. Most successful in performance was the wheel vibrating in the 20,000cycles per second frequency range. Benefits to conventional grinding are lower grinding temperature,lower power to grind,greater grinding ratios,no impairment to surface finish,no impairment to mechanical properties as to cracks,fatigue or tensile strength,even though using harder wheels than those normally used. An internal,external and surface grinder was modified to an ultrasonic grinder by attaching an ultrasonic spindle which vibrated the special ultrasonic wheel and hub assembly. Numerous grinding tests were made from which test criteria were established for the simulated production runs made on each of the three grinder types. Operational feasibility, adaptility to specific grinding operations,design variations and substantiation of previous findings were made. Procurement specifications,on industrial ultrasonic grinding machines,basically in the form of supplements to existing specifications,were made to include centerless as well as surface,external and internal grinders. (Author)