Abstract
Friction drilling process is a non-traditional hole making method which a no-chip drilling process was formed by thermal friction. In this friction drilling experimental study, the selected spindle speeds were 2400rpm, 3600rpm, and 4800rpm, feed rates was 75mm/min and tool material were HSS and WC tools with 240, 360, and 480 conical angles and 24mm, tool cylindrical region lengths. The specimens were St37 and A7075–T651 alloys with thickness of 4mm and 6mm. It was analysed the effect of experimental parameters on the micro hardness and micro structure. Maximum micro hardness values were obtained at 3600rpm spindle speed, 360 and 480 conical angles the smaller micro hardness was obtained at 240 tool conical angle. in In friction drilling of St37 steel alloy higher micro hardness values were obtained than in friction drilling of A7075-T651 aluminium alloy. Because of deficient precipitation hardening of St37 steel alloy the micro hardness was not changed over.
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