Die Cast
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Constant Area Sprue Spreaders and Sprue Bushings
Exclusively for Zinc Die Casting (Not for use with aluminum, magnesium, brass, lead or other non-zinc materials) MORE QUALITY PARTS PER HOUR! • Constant cross-sectional area reduces turbulence and porosity… IMPROVES PART QUALITY • Permits faster cavity fill…INCREASES PRODUCTIVITY • Reduces shot pressure and clamp tonnage requirements • Can be used with either baffle or cascade type cooling SPRUE SPREADERS Constant Area Sprue Spreaders for zinc die casting were developed after extensive laboratory research. The results of this investigation proved that the metal feed system should be designed with a con- stant cross-sectional area through the runner system to the gate. This cross-sectional area should be equal to or less than the mini- mum die inlet area. Sprue Spreaders are contoured to provide constant area* and control metal flow through the bushing to within .002 in.2. This improved metal flow permits faster cavity fill, while reducing both shot pressure and clamp tonnage requirements. Lower shot pressure combined with constant cross-sectional flow reduces turbu- lence and porosity. The result: Increased productivity and improved part quali- ty. Precision made of heat treated AISI H-13 steel, D-M-E Sprue Spreaders are available in three sizes (small, medium and large) and *The constant cross-sectional area at any given point will be: .330 in.2 for the small spreader and bushing assemblies (DC-30 and 40 series); .450 in.2 for the medium spreader and bushing assemblies (DC-50 and 60 series); and .780 in.2 for the large spreader and bushing assemblies (DC-300 and 400 series).
**See Cascade Water Junctions on page 42 .
SPRUE BUSHINGS
Sprue Bushings for zinc die casting are also precision made of heat treated AISI H-13 steel. They are designed for maximum water cool- ing capacity and are hermetically brazed and 100 percent leak-tested at 1800 psi. The spherical seat is precision ground and polished to provide a positive seal with the machine nozzle.
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