The virtual model, fully developed by means of the ANSYS Parametric Design Language (APDL) in ANSYS 15.0, is parametric in that the geometry is completely defined by parameters (diameters, axial length, number of keys, and
helix angle).
In the Figures 4, Cutting tool speed values selected as a control factor, speed values of the workpiece, machining depth, axial feed speed values and the effect of
helix angle factor of cutting tool over influence of S / N ratios, are seen.
Nomenclature [D.sub.h] Hydraulic diameter (m) [D.sub.O] Outer diameter (m) [D.sub.md] Meltdown diameter (m) [Nu.sub.DB] Dittus-Boelter Nusselt [D.sub.i] Inner diameter (m) [D.sub.r] Root diameter (m) [H.sub.f] Fin height (m) [beta]
Helix angle Re Reynolds Number [A.sub.md] Meltdown area (m2) [T.sub.f] Fin thickness (m) S Offset distance (m) [L.sub.P] Pipe length (m) P Pressure (Pa) f Friction factor Pr Prandtl number N Number of fins k Thermal conductivity of fluid (W/[m.sup.2].K) Ph Helix pitch (m) w Discontinuity distance (m) [rho] Density (kg/[m.sup.3]) [??] Mass flow rate (kg/s) Appendix
Figure 5 shows that the two-phase frictional pressure drop per unit length of coil increases with increasing gas flow rate at constant liquid flow rate and coil diameter, but are independent of the
helix angle. Banerjee et al.
The inclination angle [alpha] and
helix angle [phi] are constant during the injection molding process.
Here all the mechanical quantities in the supercoil are described in terms of
helix angle and standoff distance s.
The 20:1 worm gearboxes are engineered with a carefully selected
helix angle to balance load back-driving forces with locking angle effects.
Kowalski consulted with Stephen Jean, Emuge's product manager for milling tools, who recommended a single high performance cutter, featuring an extremely high
helix angle and a high flute count.
Tool manufacturers now offer a wide variety of more modern end mills for which there is a choice of
helix angle.
where [F.sub.d] and [F.sub.p] are drag and pressure flow shape factors to correct for the fact that more polymer melt will flow through a channel which is almost full than one which is completely full and D = barrel diameter; N = screw speed in RPMs; h = screw channel depth; p = number of flights; b = flight width; t = flight lead length; [phi] =
helix angle of screw flights; [L.sub.m] = effective length of melt conveying section; and [mu] = melt viscosity.
