An Extruding operation uses a polymer melt with a viscosity of 12 x 1ot and produc...
(5 pts) Continuous tubing is produced in a plastic extrusion operation through a die orifice whose outside diameter = 2.0 in and inside diameter = 1.5 in. The extruder barrel diameter 5.0 in and length = 12 ft. The screw rotates at 50 rev/min; it has a channel depth 0.30 in and flight angle 16°. The head pressure has a value of 350 lb/in2 and the viscosity of the polymer melt is 90 x 10-4 lb-sec/in2. Under these conditions, what...
An ECM operation is to be used to cut a hole into a plate of aluminum that is 12 mm thick. The hole has a rectangular cross section, 10 mm by 30 mm. The ECM operation will be accomplished at a current = 1200 amps. The specific removal rate for aluminum = 3.44×10-2 mm3-Amp/sec. Determine (a) feed rate, and (b) time required to cut through the plate. In the casting of steel under certain mold conditions, the mold constant in...