To improve the surface forming quality and machining efficiency of aluminum matrix composites

a twodimensional ultrasonic combined electrolysis/discharge generating machining technology (2UE/DM) with low voltage and low current density was proposed. Using the side of a tool coated with diamond grains

three different processing contrast tests and performance tests under three sets of parameters were carried out on the composite. The current

material removal rate (MRR) and surface roughness of SiC

p

Al composites processed in 0.5% NaNO

3

(mass fraction) solution were measured

and the effects of tool rotation speed

voltage a

nd amplitude on processing efficiency and quality were explored. The results showed that the vibration of the workpiece periodically changed the machining gap

and the discharge frequency increased by 2 times per vibration period. At 5000 r/min

the discharge frequency decreased

the surface roughness decreased by 13.2% compared with 1000 r/min. At the voltage of 6 V

the material removal rate reached 0.89 mm

3

/min

which was 45.9% higher than 3 V

but more reinforcing particles were exposed at the higher voltage

and the surface roughness was 1.4 μm higher than 3 V. When the amplitude increases to 5 μm

the surface roughness was 17.5% lower than 2 μm

and the technology had higher machining quality.