Page 82 - Hot Runner & Control Systems 2020

80 Straight-Shot Hot Sprue Bushings

High-Performance Series Straight-Shot ™

High-Performance “E” Type (Extended Tip Configuration)
Straight-Shot Bushings
are available as E-type • Replaces conventional cold sprue bushings to reduce cycle time and save
material costs
• Efficiently processes commodity or engineering grade resins
• High-watt density heater with distributed wattage to help prevent tip
freeze-offs
• .062 or .125 DIA. Tips with 0.49 Land area for machining of molded part
details
7
7
• Seven shoulder lengths from ⁄8 to 3 ⁄8
• 500 and .750 Spherical radius for machine nozzle
.277 MAX.
DEPTH Always machine runner or part contour to the .277 maximum depth at centerline of gate. However,
do not weaken the bushing face by exceeding this maximum dimension (Figures 1 and 2). Always
machine part contour to the .277 maximum depth at edge of retainer, with 15° maximum angle.
Straight-Shot Hot Sprue Bushings | High-Performance Series Straight-Shot
FIG. 1 Machine a 3° minimum taper to the gate diameter. This will result in a small sprue on the part being
molded (Figure 3). Machine a 3° minimum taper to the gate for a reverse taper sprue on the part being
Hot Runner Systems | 4-Zone and 8-Zone Timer-Based Sequencers
molded (Figure 4). Retainer material is H-13 steel 46-52 HRC.
.277 MAX. NOTE:
DEPTH The expansion factor must be taken
into consideration prior to machining
R.750 for and installation of the bushing.
R.500 This factor (BE) must then be added
FIG. 2 .17 E-TYPE (EXTENDED TIP to the A dimension. The formula for
CONFIGURATION) determining this expansion factor is
15° MAX. as follows:
FIG. 3 BE = “A” dimension x 0.00000633
.277 MAX. MAX. x nozzle set point - 68ºF (assuming
.312 DIA. the mold is at 68ºF during opera-
tion). If mold temperature is
5.28 different, substitute 68ºF with
(E-TYPE) actual mold temperature.
3° MIN. .015 RELIEF
GATE .62 EXAMPLE:
FIG. 4 CUSTOMER MAY ALTER Given a setpoint of 500°F:
.277 MAX. (.500 MAX.) TO ACCOMMODATE BE = 1.375 × .0000063 × (500 – 68) =
DEPTH .490 NON-STANDARD "A" LENGTHS .004 thus 1.375 + .004 = 1.379.
A = 8 TO 3 7 8 Please note that the above
7
information is given as an example.
Variations may occur based on mold
3° MIN. "0" DIA. configuration and cooling factor. In
GATE 1.995 DIA. +.000 1.000 DIA. some instances, it may be necessary
– .005
to obtain an empirical factor.
BUSHING ASSEMBLY REPLACEMENT PARTS
BUSHING
SHOULDER SHOULDER TIP RETAINER BODY SPACER HEATER THERMOCOUPLE
O LENGTH ASSEMBLY BUSHING ITEM ITEM ITEM ITEM ITEM ITEM
DIA. ITEM
A ITEM NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER
NUMBER
7 HPS0607E2 HPS2007
⁄8
3
1 ⁄8 HPS0613E2 HPS2013
7 HPS0617E2 HPS2017
1 ⁄8
.062 2 ⁄8 HPS0623E2 HPS2023 HPT0001 HPT0602 HPS0001 HPT1001 HPS2001 HPS3001
3
7
2 ⁄8 HPS0627E2 HPS2027
3 HPS0633E2 HPS2033
3 ⁄8
7 HPS0637E2 HPS2037
3 ⁄8
7 ⁄8 HPS1207E2 HPS2007
3 HPS1213E2 HPS2013
1 ⁄8
7 HPS1217E2 HPS2017
1 ⁄8
.125 2 ⁄8 HPS1223E2 HPS2023 HPT0002 HPT1202 HPS0001 HPT1001 HPS2001 HPS3001
3
7 HPS1227E2 HPS2027
2 ⁄8
3 HPS1233E2 HPS2033
3 ⁄8
7
3 ⁄8 HPS1237E2 HPS2037
NOTE: High-Performance Series Straight-Shot Hot Sprue Bushings heater has voltage of 240 VAC, 700 watts. Thermocouple is “J” type.
U.S. 800-626-6653 n Canada 800-387-6600 n dme@milacron.com n www.milacron.com