Outer Undercut Unit - DHO

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Cumsa has developed a series of mechanical lifters, supplied ready for installation, that can release undercuts of 12 to 22.50 mm with only 38.00 mm of ejection stroke, simplifying the machining of tools and avoiding angled machining, which is a key problem with conventional lifters owing to their complexity and lack of accuracy.

The lifters’ pockets are always oriented at 90° to facilitate machining. This ensures correct lifter alignment with respect to the core and their fixation in the ejector plates. This feature also guarantees smooth movement of the lifters and ejector plates as the lifters work in a vertical direction, helped by a bronze sliding guide.

The lifters’ vertical functionality also results in a significant reduction of tool cost and space requirements. Also important is that lifter movement is generated by the housing which is installed in the core, not in the ejection plates as with conventional lifters. This allows the lifter to be fixed in the ejector plate in just the space of an ejector pin. The cumulative result of these features is a much smaller tool that may enable a lower-tonnage machine to be used for injection and the cost of the final plastic product to be lower.

The lifters support the moulding of inner and outer undercuts and the release of positive- and negative-surface undercuts.

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