# Hot Runner & Control Systems

65

D-MAX Hot Sprue Bushings

High Performance Hot Sprue Bushing 250 Series

For selection of gate diameter it is important to take into consideration the material flow characteristics, share rate of resin, molding conditions, fill time requirements, gate vestige, wall thickness and configuration of parts to be molded. Situations requiring high injection velocities must be considered when selecting small gate diameters. High injection rates may require larger gates due to shear heat build up (e.g. high weight thin wall applications). See material manufacturer’s literature for further information regarding material to be molded. To compensate for nozzle’s growth when heat is applied, the linear expansion of the nozzle (BE) at a given temperature must be added to the nominal “A” dimension. The formula below shows how to figure boring depth (dimension “A” + BE). The tip of the nozzle will now be flush with the cavity line at processing temperature. Formula for determining this expansion factor is as follows: BE = “A” dimension x 0.00000633 x nozzle set point - 68ºF (assuming the mold is at 68ºF during operation). If mold temperature is different, substitute 68ºF with actual mold temperature. EXAMPLE: Given a 4.134 inch “A” dimension, with a set point of 500ºF: BE = 4.134 x 0.00000633 x (500 - 68) = 0.011 Thus “A” + BE will be 4.145 NOTE: The above information is only given as an example; variations may occur based on mold configurations and cooling factor. In some instances, it may be necessary to obtain an empirical factor.

NOTE: Dimensions shown in inches unless specified otherwise.

Ø 4.000 LOCATING RING BORE

R0.24

Ø4.000 LOCATING RING BORE

R0.38

R0.24

R0.38

3.50

1.50

0.49

Ø1.575

(2) 5/16-18 UNC Tap

3.50

+0.001 0.000

0.717

1.50

NOTE: MATCH MACHINE NOZZLE TIP ORIFICE

R0.50 R0.75

0.49

Ø0.31

Ø1.575

(2) 5/16-18 UNC Tap

5

+0.001 0.000

INSULATION SHEET (OPTIONAL)

0.717

3

NOTE: MATCH MACHINE NOZZLE TIP ORIFICE

4

R0.50 R0.75

Ø0.31

5

INSULATION SHEET (OPTIONAL)

R0.016 MAX

“O” DIA.

“S” DIA.

3

Ø1.187 Min. - Ø1.250 Max.

FILLED RESIN

UNFILLED RESIN

*0.3750 0.5005 0.7505 1.0005

1 2

A + BE

0.028 Min.

0.062 Min.

4

0.31 MIN

1/2-24 UN TORQUE TO 30 FT/LBS

WATER LINES

* Point Gate (Full Body) only.

High Performance Hot Sprue Bushing - 250 Series

R0.016 MAX

Ø1.187 Min. - Ø1.250 Max.

BUSHING AND COMPONENT SPECIFICATIONS

ASSEMBLY COMPONENTS

1 2

A + BE

“A” DIMENSION

ASSEMBLY

BUSHING BODY DETAIL #1

HIGH PERFORMANCE HEATER DETAIL #2 WATTAGE

THERMOCOUPLE DETAIL #4

* Locating rings must be ordered separately.

DMAX06055 DMAX06067 DMAX06080 DMAX06092

2.165in (55.00mm) 2.657in (67.50mm) 3.150in (80.00mm) 3.642in (92.50mm)

DEP06055 DEP06067 DEP06080 DEP06092 DEP06105 DEP06130 DEP06155

CIH0081S

440 350 400 565 500 500 550

0.31 MIN

1/2-24 UN TORQUE TO 30 FT/LBS CIH0082S CIH0083S

WATER LINES

DTC38001 or DTC38002* (High-Heat)

Ø1.187 MIN 80°

Ø1.187 MIN

Ø1.187MIN

Ø1.187 MIN

RDP38021 30°

500

CIH0084S CIH0085S CIH0086S CIH0087S CUSTOMER RADIUS TO SUIT 30°

30°

30°

DMAX06105 4.134in (105.00mm) DMAX06130 5.118in (130.00mm) DMAX06155 6.102in (155.00mm) R0.125 R0.010- .0 5

25° MAX

Ø S 0.0000 +0.0005

Ø O Ø0.3750 0.0000 +0.0005

Ø S 0.0000 +0.0005 * NOTE: FOR HIGH-HEAT APPLICATIONS (>625F) PLEASE CONTACT DME APPLICATION ENGINEERING FOR DESIGN ASSISTANCE- appl_eng@dme.net

Ø S 0.0000 +0.0005

STD. SPRUE AND POINT GATE (FULL BODY)

EXTENDED SPRUE AND EXTENDED POINT GATE (FULL BODY) RUNNER DESIGN

EXTENDED SPRUE AND EXTENDED POINT GATE (FULL BODY) ANGLE DESIGN

POINT GATE (BODILESS)

Ø1.187 MIN 80°

Ø1.187 MIN

Ø1.187MIN

Ø1.187 MIN

30°

30°

30°

30°

R0.010-0.015

25° MAX

Ø S 0.0000 +0.0005

R0.125

Ø O Ø0.3750 0.0000 +0.0005

Ø S 0.0000 +0.0005

Ø S 0.0000 +0.0005

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

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