STANDARD EXPANDABLE CAVITY SYSTEMS EX-CAV System & Mounting Kits
STANDARD EXPANDABLE CAVITY SYSTEMS Technical Information
EX-CAV System
±.025
Expandable Cavities simplify tooling design to effectively mold undercuts such as threads, dimples, and protrusions on parts such as snap O-ring caps, plumbing supplies, industrial flanges and valves, electrical fixtures, and much more. The patented Expandable Cavity design eliminates the engineering, maintenance, and machining required for slide action mechanisms which results in smaller molds or higher mold cavitation.
250
Length can be modified to suit application.
±.025
C
250
125
Length can be modified to suit application.
T
C
125
±.015
T
D
±.015
D
Patent Pending
S g6
Patent Pending
S g6
10° (conical)
10° (conical)
D EX-CAV DIAMETER
A MAXIMUM PART DIAMETER -10° PER SIDE
B MAXIMUM MOLDING LENGTH
C MINIMUM PART INNER DIAMETER
E EXPANSION PER SIDE
F MIN. WALL THICKNESS
S BODY DIAMETER
T THREAD
X MINIMUM EJECTION STROKE (NEXT PAGE)
E Expansion per side
E Expansion per side
ITEM NUMBER
C
EXCAV20 20 EXCAV26 26 EXCAV38 38 EXCAV50 50
14 18 30 40
13 20 27 39
2.5 3.5 4.0 5.5
1.6 2.5 3.0 3.5
3 4 4 5
14 16 27 34
M8
15 15 20 20
C
B
M10 M18 M24
B
A
A
All dimensions and tolerances in millimeters. Mounting kits sold separately (see below). Expandable Cavity sizes not shown on this table are available by special order.
X Min. Ejector Stroke
Mounting Kits Hollow Bolt Mounting Kit Includes: • Key (7 Thk. × 8 × 40) • Hollow Bolt • Standard DIN H-13 Ejector Pin (400mm long) • Spacer
Pin Bolt Mounting Kit Includes: • Key (7 Thk. × 8 × 40) • Threaded Bolt/Pin (H-13, 40-44 HRC, 280mm long) • Spacer
Mold Closed
Mold Open
Technical Information: • Available in four standard sizes to satisfy a wide range of applications. • The Expandable Cavity expands along a conical shape; 10° per side. • Manufactured from A-2 tool steel (54-57 HRC) for repeatable expansion. For optimal performance, the Expandable Cavity should ride against a hardened insert. • Expandable Cavities are capable of operating without lubrication. However, treating the Expandable Cavity with an additional coating for wear reduction or corrosion resistance is beneficial. • Expandable Cavities can be ordered with molding detail for a ‘mold ready’ component.
D
D
Modified to suit
Modified to suit
F
D
D
Modified to suit D2 D2
Modified to suit D2
.05 Min Clearance
B
D2 +.025 +.050
Key
Key
Key
Key
+.025 +.050
+.025 +.050
+.025 +.050
Spacer
Spacer
Spacer
Spacer
T
T
T
T
D NOMINAL PIN DIAMETER
D PIN DIAMETER
T BOLT SIZE
T BOLT THREAD
S SPACER SIZE (ID × OD × THK)
S SPACER SIZE (ID × OD × THK)
ITEM NUMBER EXCAV20 EXCAV26 EXCAV38 EXCAV50
ITEM NUMBER EXCAV20 EXCAV26 EXCAV38 EXCAV50
D2 HOLLOW BOLT KIT NUMBER
D2
PIN BOLT KIT NUMBER
3.5
M8-1.25 × 40 8 × 22 × 4 14 EXC20BH M10-1.5 × 40 10 × 23 × 4 16 EXC26BH M18-2.5 × 50 19 × 33 × 6 27 EXC38BH M24-3 × 55 25 × 42 × 6 34 EXC50BH
6.0 7.7
M8-1.25 8 × 22 × 4 14 EXC20BP M10-1.5 10 × 23 × 4 16 EXC26BP M18-2.5 19 × 33 × 6 27 EXC38BP M24-3 25 × 42 × 6 34 EXC50BP
4
10 14
14.5 19.8
98
99
U.S. 800-626-6653 ■ Canada 800-387-6600 ■ dme@milacron.com ■ www.dme.net ■ store.dme.net
U.S. 800-626-6653 ■ Canada 800-387-6600 ■ www.dme.net ■ store.dme.net
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