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.
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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