COLLAPSIBLE CORES EX_CAV Standard Expandable Cavities
COLLAPSIBLE CORES S-Core Collapsible Cores
RETAINING RINGS
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.
Want to produce more parts in a smaller space? The DME S-Core Rack System allows for cores to be placed closer together by utilizing a common retaining ring. This is an important feature when space in the mold is limited. This allows designers to create smaller molds to run on
smaller presses - saving time and money. Rack systems can be made with up to 8 cores and a minimum spacing of 30mm, however this is dependent on the size of the product being produced and the required under cut depth.
ADDING DETAIL MADE EASY
DME can provide the DME S-Core ready to install with the complete thread or undercut detail already machined in, however in some cases customers like to complete this detailed work. The new DME S-Core is designed with a flat bottom (shown below). When the core is positioned flat it is at location “zero” or “molding position” allowing for ease of setup to perform final machining or EDM. NOTE : Manufacturing fixture available upon request at no additional cost when purchasing all DME S-CORES.
STYLES EXAMPLES
Q. Are there any temperature limitations? A. Maximum temperature is 260°C/500°F.
DLC COATED
RECTANGLE OPENING
CUSTOM
STANDARD
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 ■ . Mexico 52-442-713-5666 ■ . dme.net ■ store.dme.net
U.S. 800-626-6653 ■ Canada 800-387-6600 ■ . Mexico 52-442-713-5666 ■ . dme.net ■ store.dme.net
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