CO LL AP SIB LE CORES DT Series Collapsible Cores Split Rings & Optional Retention Sleeve Split Ring Material: A-2, 54-57 HRC Utilizing the split ring allows for a simpler attachment method.
STANDARD EXPANDABLE CAVITY SYSTEMS Cost Savings & FAQs The Expandable Cavity (EX-CAV ® ) simplifies design and cuts costs to reliably mold and release external profiles on circular plastic parts. The product is ideal for parts such as bottle caps, threads, snap rings, barbs, convex grooves, protrusions, logo details, etc. Expandable Cavities eliminate the need for traditional slide action assemblies, thereby allowing higher cavitation within the same mold footprint to increase productivity. Depending on the part configuration, the Expandable Cavity’s striker insert can be used in the “A” or “B” side of the mold. • Expandable Cavities with an “A” side striker insert mold the complete part, enabling details such as an outer thread or a snap ring to be released from the mold. • Expandable Cavities with a “B” side striker insert are for part configurations where undercuts such as barbs and protrusions are located under the part surface. Cost Savings that Maximize Value • Simplified mold design – Eliminates traditional slides; allows molding of details once considered “un-moldable” – Uses existing ejector system for actuation; either mold open or ejection stages the Expandable Cavity forward to release the molded undercut • Reduces maintenance costs • Maximizes cavities per mold – Compact; often enabling more cavities in the mold and/or the use of a smaller mold base • Improved mold balance and flexibility in design • Easily accommodates family molds • Detail is machined in a one-piece unit eliminating the risk of error or mismatch that can occur with mating slides • Manufactured with certified alloy steel (A-2) and proprietary processing techniques to ensure long life and dependable performance Frequently Asked Questions Q. What are the material types from which an Expandable Cavity can be made, and how much hardness and wear resistance is expected? A. A-2 tool steel is the default material. It has a hardness of 54-57 HRC. Wear resistance is very good. Q. Are surface treatments recommended? A. It depends on the application. The DME engineering staff will review potential options, if needed.
C
A
B
A OUTER DIAMETER
B INNER DIAMETER
C THICKNESS
ITEM NUMBER
USE WITH DT CORE
16mm .63in
7.95mm .313in 9.53mm .375in 10.31mm .406in 11.13mm .438in 13.49mm .531in 16.66mm .656in 22.23mm .875in 26.19mm 1.031in 30.96mm 1.219in 34.93mm 1.375in 39.70mm 1.563in 12.70mm .500in 15.88mm .625in 20.62mm .812in 25.40mm 1.000in
3.99mm .157in 3.99mm .157in
DT1010 DT1111 DT1212 DT1313 DT1414 DT1515 DT1616 DT1717 DT1819 DT2021 DT2224 DT2527 DT2830 DT3133 DT3436 DT3739 DT4042 DT4345 DT4648 DT4951 DT5254 DT5557 DT5860
DTSR1011
17.53mm .69in 20.32mm .80in 21.08mm .83in 25.40mm 1.00in 28.70mm 1.13in 34.29mm 1.35in 42.16mm 1.66in 46.99mm 1.85in 50.80mm 2.00in 59.69mm 2.35in 24.89mm .98in 27.94mm 1.10in 34.80mm 1.37in 37.59mm 1.48in
DTSR1213
5mm .197in 5mm .197in
DTSR1415
DTSR1617 DT - Series Cores are no longer available Please see DME S-Series Collapsible Cores DTSR1821
5.99mm .236in 5.99mm .236in 5.99mm .236in
DTSR2227
Assemble Core into the Mold. Then collapse the core to install the split ring.
DTSR2833
Assemble Core into the Mold. Then collapse the core to install the split ring.
8mm .315in 8mm .315in 8mm .315in
DTSR3439
DTSR4045
DTSR4651
9.98mm .393in
DTSR5260
6.35m .250in
DTSR18
DT18
6.35mm .250in 6.35mm .250in 6.35mm .250in
Push Center Pin forward to molding position and install the back plate
DTSR28
DT28
DTSR38
DT38
Push Center Pin forward to molding position and install the back plate
DTSR48
DT48
Collapsible Core
Molded Part
Optional Retention Sleeve Material: D-2, 60-62 HRC
Retention Sleeve Carrier Top Ring
Retention Sleeves for the DoveTail Cores assure the position of the molded part during core collapse and part ejection. Email dme_mech_eng@milacron.com for more information.
Q. Are there any temperature limitations? A. Maximum temperature is 260°C/500°F.
Q. What is the expected life cycle of an Expandable Cavity and what maintenance is required? A. Customers have run millions of cycles. The biggest factor for performance is not the flexing aspect or fatigue as much as cleanliness of the tool over the life of the mold.
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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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