Multi-Cavity Unscrewing Injection Mold

Multi-cavity unscrewing molds

A multi-cavity unscrewing mold has a more complex structure than a single-cavity one: several threaded cores must rotate together, driven by one gear train, while every cavity fills and cools identically. Designing and building such a mold needs an experienced engineering team and mold makers who have done it many times.

External threads without a visible line

The parts in this mold have external threads, which often must be molded with an extremely fine parting line, or with no visible parting line at all, so the thread seals and looks clean. That rules out simple split cavities and calls for rotating thread rings or very precise slides.

Precision machining and assembly

• Mold components machined by CNC, wire cutting and lathe, with thread forms ground to profile.
• Gear train components fitted so all cavities unscrew in sync.
• Toolmakers assemble the mold exactly to the design, checking backlash and alignment at every cavity.
• AISI H13 cavities, cold runner, HASCO standard, for 30% glass-filled PA.

Proven before shipment

We run the mold on our presses and check threads from every cavity with gauges, along with cycle time and the smooth running of the unscrewing mechanism.

How a project like this works

• Tell us what you need – the mold only, molded parts, or both, and your estimated annual volume.
• Send drawings – STEP, IGES, STL, DWG or PDF, or a sample. We sign off moldability in a DFM review.
• Quotation – tooling price, part price and a schedule, with steel, cavities and runner proposed.
• Mold design approval – you approve the 3D mold design before steel is cut.
• T1 samples + FAI report – production or mold shipment starts after your approval.

Shipping molds and parts

• Molds are cleaned, rust-protected, marked and checked against a shipment checklist: cooling circuits, sprue, locating ring, ejection and support pillars.
• Molds ship with drawings, a spare-parts list and the T1 process sheet.
• Parts are packed to your packing instruction and inspected before shipment.
• We ship to customers in Europe, the USA and Asia.

After-sales

Our after-sales team supports mold maintenance and modifications remotely and can supply spare inserts. Contact customerservice@precisemoulds.com.