38mm Push & Turn Outer
Closure undercuts do not allow part to be stripped. Conventional lifters are typically not designed for high-volume molding.
CTD Designed a high-volume lifter utilizing dovetails rather than conventional flat fits. The Lifters are removable from the parting line of the mold. The core is WCC plated and the lifters are Titanium Nitride (TiN) coated.
CR Tube Cap
The plastic part has 4 undercuts and cannot be stripped without sacrificing the integrity of the closure.
CTD designs a completely mechanical system, driven by press knockout system requiring only one stroke forward and one stroke back, with no cylinders, switches, electrical or hydraulics. The Core moves forward and then rotates, allowing room for the undercuts to pass intact and be stripped off.
Backlite Harness Cover
Customer designs part with undercuts that are too aggressive to strip. These snap features overhang on the inside of the part by .070” in 5 places on a part the size of your thumb. How does CTD eject the part out of the tool?
In conjunction with a wedge pin driven slide. CTD develops a miniature collapsing core mechanically activated by delayed ejection for this application.
A cost effective collapsing core with dual PVD coatings obtains a useful life well beyond the customer’s expectations.
The volumes of the product are large enough to warrant a 64-cavity hot runner mold. However, the product does not have enough room for ample sized ejector pins. The prototype experiences mechanical failures due to the small pins.
Design mold that does not have the need for the small pins. CTD designs a mold which pushes the part (while still on the ‘B’ half core) through a set of open slides; on the start of the ejector return, the slides are closed. This allows the slides to act as a stripper, which strips the part off of the core.
A 64-cavity mold running at a sub 10-second cycle time without the ejector pin maintenance problem.
Contact us to find out what solutions CTD can implement for your tooling challenges…