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Expandable Cavities EXCAV

EXPANDABLE CAVITIES
EX-CAV® SYSTEM

Expandable Cavities (Ex-Cavs) mold undercuts such as threads, dimples, and protrusions.

The patented Ex-Cav design eliminates the engineering, maintenance, and machining required for side action mechanisms which results in smaller molds or higher mold cavitation.

Technical Information:

  • Four sizes offered to satisfy a wide range of parts.
  • The Ex-Cav expands along a conical shape, 10° per side.
  • Manufactured from A-2, 54-57 HRC material for repeatable expansion. For optimal performance, the Ex-Cavs should ride against a hardened striker insert which can be manufactured by Roehr or customer supplied.
  • Maximum temperature: 260°C / 500° F
  • Expandable Cavities generally operate without lubrication.
  • Ex-Cavs can be ordered with molding detail for a ‘mold ready’ component.
  • Ex-Cav Fixtures for machining details in house are also available.
  • Custom Ex-Cavs are available. Also, when an entire part is formed within the cavity, an A-Series Ex-Cav can be provided.
M A-2 H 54-57 HRC
CATALOG
NUMBER
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
L
Expansion
Length
S
Body
Diameter
T
Thread
X
Minimum
Ejection
Stroke
(Prev. page)
EXCAV20 20mm
.787in
14mm
.551in
13mm
.512in
2.5mm
.098in
1.6mm
.063in
3mm
.118in
59mm
2.323in
14mm
.551in
M8 15mm
.591in
EXCAV26 26mm
1.024in
18mm
.709in
20mm
.787in
3.5mm
.138in
2.5mm
.098in
4mm
.157in
76mm
2.992in
16mm
.630in
M10 15mm
.591in
EXCAV38 38mm
1.496in
30mm
1.181in
27mm
1.063in
4mm
.157in
3mm
.118in
4mm
.157in
89mm
3.504in
27mm
1.063in
M18 20mm
.787in
EXCAV50 50mm
1.969in
40mm
1.575in
39mm
1.535in
5.5mm
.217in
3.5mm
.138in
5mm
.197in
101mm
3.976in
34mm
1.339in
M24 20mm
.787in

Custom Ex-Cavs are available for molded parts up to and beyond 500mm.

Ex-Cav sizes outside of this chart are available as customs.