Page 21 - Die Casting Die Assemblies

Die Cast
21
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!

• n Constant cross-sectional area reduces turbulence and porosity…
IMPROVES PART QUALITY
• n Permits faster cavity fill…INCREASES PRODUCTIVITY

• n Reduces shot pressure and clamp tonnage requirements
• n Can be used with either baffle or cascade type cooling

SPRUE SPREADERS

D-M-E Constant Area Sprue Spreaders for zinc die casting were developed after
extensive laboratory research . The results of this investigation proved that the metal
TYPICAL APPLICATION feed system should be designed with a constant cross-sectional area through the
WITH BAFFLE TYPE COOLING runner system to the gate . This cross-sectional area should be equal to or less than
the minimum die inlet area .
D-M-E Sprue Spreaders are contoured to provide constant area* and control metal
flow through the bushing to within .002 in . . This improved metal flow permits faster
2
cavity fill, while reducing both shot pressure and clamp tonnage requirements . Lower
shot pressure combined with constant cross-sectional flow reduces turbulence and
porosity . The result: Increased productivity and improved part quality .

Precision made of heat treated AISI H-13 steel, D-M-E Sprue Spreaders are available in
three sizes (small, medium and large) and two styles (short and long) . All Sprue Spreaders
are designed to provide two types of cooling, no longer requiring separate body styles . Die Cast | Constant Area Sprue Spreaders and Sprue Bushings
All spreaders 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 .
FIGURE 1
WITH CASCADE TYPE COOLING
*The constant cross-sectional area at any given point will be:
.330 in . for the small spreader and bushing assemblies (DC-30 and 40 series);
2
.450 in . for the medium spreader and bushing assemblies (DC-50 and 60 series); and
2
.780 in . for the large spreader and bushing assemblies (DC-300 and 400 series) .
2

**See Cascade Water Junctions on page 42 .

(WATER) OUT
(WATER) IN
SPRUE BUSHINGS
D-M-E Sprue 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 percent leak-tested at 1800 psi . The spherical seat is precision ground
and polished to provide a positive seal with the machine nozzle .

FIGURE 2

U.S. 800-626-6653 n Canada 800-387-6600 n www.dme.net