Diamond Systems Tritan Guia de Resolução de Problemas descarregar pdf (Página 13)

Figure 10 Sprue design

Sprue cooling

In Figure 11, upper and lower cooling line circuits are shown

around the sprue to aid in cooling. The sprue bushing should be

assembled with a slight 0.005-mm (0.2-mil) interference ﬁt to

ensure good heat transfer from the bushing into the mold plate.

Figure 11 Sprue cooling

Spiral cooling sprue insert

Figure 12 shows another effective approach to removing heat

from the sprue or long cores. This sprue bushing contains a

double-helix cooling channel design with water ﬂowing up and

around the sprue, then back down again.

Figure 12 Spiral cooling sprue insert

High-conductivity sprue bushing

Many Eastman customers are successfully using the high-

conductivity sprue bushings shown in Figure 13. The bushing

is made from a high-conductivity copper alloy. It contains a

hardened 420 stainless steel nozzle seat to insulate from nozzle

heat and for wear resistance. This is effective in reducing sprue

sticking, increasing sprue rigidity for pickers and grabbers, and

cutting cycle time. With this sprue bushing, a standard sprue

taper of 42 mm/m (0.5 in./ft) has been found to be acceptable

for good heat transfer.

It is strongly suggested that customers install these sprue

bushings in new molds and when modifying existing molds to

process Eastman

™

polymers. They are available worldwide from:

Performance Alloys & Services, Inc.

N116 W18515, Morse Drive

Germantown, WI 53022 U.S.A.

Tel: (1) 800-272-3031 or (1) 262-255-6662

www.performancealloys.net

80 mm

(3 in.)

max.

Runner

Sprue puller

Sprue

High polish

(in direction

of draw if

possible)

Generous

radius

Taper 3.0° included angle

Use ejector pin. Air poppet

would cause hot spot and

impede cooling.

38–45 mm

(1.5–1.75 in.)

Upper water

line circuit

Lower water

line circuit

0.005-mm (0.2-mil)

interference fit

between sprue

bushing and mold

OUT

Sprue location

Sprue bushing

Double-lead

thread design

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 43 44

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Diamond Systems Tritan Guia de Resolução de Problemas Página 13

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