Friction drilling is used to process special holes with a
bushing and a boss in thin sheet metals without producing
chips via a non-traditional tool-drill. Friction drilling
parameters involve the feed rate, rotational speed and
profile dimensions of the drilling tool, which directly
affect the induced bushings dimensions, as well as, the
microstructure of the produced hole. In the present study,
friction drilling parameters were manipulated during the
performance of friction drilling of 6082 and 7075
Al-alloys, moreover, the temperature variation in the
tool-work-piece interface was recorded during the drilling
processes via an infrared camera and four thermocouples
located at different positions near the drilling zone.
During the formation of the bushing and the boss in the
investigated aluminum sheet metals, the minimum measured temperature was 220 °C and the maximum
measured temperature was 380 °C. It was found that the
temperature in the tool-work-piece interface increased
with the reduction of the feed rates and the increase of
both of the rotating speeds and the tool cone angles.
Furthermore, the surface roughness values of the drilled
holes were found to be increased with the increase of the
rotational speeds. |
