Calculation • Sectional area=910mm2 • Density X Gate speed X Sectional area = • Density X Injection speed X Sectional area of the chamber • Inner gate velocity= ( 3m/s X π X(0.06)2) /910e-6 • Inner gate velocity =35~37m/s
Facts • Slow shot velocity until molten metal has reached the gate. • Fast shot velocity begins after the runners are filled ( but not he casting). • Fast shot velocity has been taken as 3m/s • Dia of shot sleeve is 120mm. Radius is 60 mm = 60 * 10 ^-3 m = 0.06 m • Flow rate (m3/s) = Cross-sectional area (m2) x velocity (m/s)
Qc = Flow rate of metal into the die cavity.
Qs = Flow rate of metal from the shot sleeve (Fast shot flow rate)
Qs = Qc ( Since it is the same hydraulic system)
Calculation • Qs = Qc • Qs = Cross sectional area of shot sleeve X fast shot velocity • Qc = Cross sectional area of gate X gate velocity • Cross sectional area of shot sleeve = π x r^2 = π x(0.06) ^2 m2 • Fast shot velocity = 3 m/s • Cross sectional area of gate = 910mm2 = 910 x 10^-6 m2
Calculation • Qs = Qc • 3(m/s) x π x (0.06)^2 (m2) = 910 x 10^-6 (m2) x Gate velocity • Gate velocity = 3(m/s) x π x (0.06)^2 (m2) 910 x 10^-6 (m2) =
