نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران
2 استادیار، مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران
3 دانشجوی دکتری، مهندسی مکانیک، دانشگاه اراک، اراک، ایران
4 دانشیار، مهندسی مکانیک، دانشگاه اراک، اراک، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Metal matrix composites (MMCs) have higher modulus of elasticity, toughness and ductility than base metal and are widely used in many different industries. These materials have excellent properties such as light weight, high resistance to weight ratio, high specific hardness, high thermal conductivity and good abrasion resistance. Due to the high hardness, machining of these materials by conventional machining processes is very difficult. Electrical discharge machining (EDM) is an advanced machining process can be used to machining metal matrix composite. Experiments related to the present study were modeled using Design Of Experiments (DOE) and Response Surface Methodology (RSM) and the effect of parameters of discharge current intensity, pulse on time and pulse off time in the machining process of electric discharge machining of AZ91 alloy metal matrix composite Magnesium reinforced with 5% silicon carbide powdered particles has been studied and optimized on the material removal rate and surface roughness of the workpiece. The discharge peak current is the only factor affecting the material removal rate and the highest material removal rate can be achieved at pulse on time 300 µs, discharge peak current 17.5 A and pulse off time 40 µs as much as 542 mg/min. the parameters of pulse on time, discharge peak current and Interaction effect of pulse on time and discharge peak current are the factors affecting the surface roughness of the workpiece. The minimum surface roughness of the work piece is 9.55 µm in the pulse on time 100 µs and discharge peak current 5 A.
کلیدواژهها [English]