Die Cast
®
25
Runner Spreaders and Bushings
Exclusively for Zinc Die Casting (Not for use with aluminum, magnesium, brass, lead or other non-zinc materials) • Production proven for casting of thin wall parts • Eliminates turbulence and reduces porosity…IMPROVES PART QUALITY • Permits faster cavity fill and sprue cooling… REDUCES CYCLE TIME…INCREASES PRODUCTIVITY • Reduces volume of metal in sprue by 75%… OPTIMIZES MACHINE CAPACITY…LOWERS ENERGY COSTS • Can be used with either cascade or baffle cooling RUNNER SPREADERS Runner Spreaders for zinc die casting were developed after exten- sive laboratory and field research. The results of this research proved the metal feed system could be improved by extending the runner into the spreader area. Runner Spreaders are manufactured to permit the die maker to machine one or more runners into the spreader. This improved metal feed system provides faster cavity fill, decreased cycle time, reduced porosity, improved part quality, less shot weight and opti- mization of machine capacity. In some cases, thin wall parts that cannot be produced by other means can be successfully die cast by using Runner Spreaders. Precision made of AISI H-13 steel, D-M-E Runner Spreaders are available in three sizes (small, medium and large) and two styles (short and long). All Runner Spreaders are designed to provide two types of cooling, without the need for separate body styles. They are supplied with baffles installed for baffle type cooling (FIGURE 1). If cascade type cooling is preferred, simply replace the baffle with a cascade water junction* (FIGURE 2). Either way, the Spreader’s uniform center cooling design provides ample water flow for faster cycles. The Runner Spreader is supplied at 40-46 Rc to allow the die maker to mill or EDM the runner(s) in the spreader. For optimum die per- formance, the runner in the spreader should have a cross-sectional area 8% to 10% larger than the runner in the die. This will cause the velocity of the zinc to increase as it enters the parting line of the die…permitting a faster cavity fill and reducing cycle time.
**See Cascade Water Junctions on page 42.
RUNNER BUSHINGS Runner Bushings for zinc die casting are also precision made of heat treated AISI H-13 steel. They are designed for maximum water cooling capacity and are hermetically brazed and 100% leak tested at 1800 psi. The spherical seat is ground to provide a positive seal with
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