Unscrewing Mold for Pipe Fitting Parts

Unscrewing molds for pipe fittings

This Y-type pipe fitting has threaded connections that must seal against their mating pipes. Sealing is the key to a successful pipe-fitting mold: a thread with flash, a mismatch at the parting line or a deformed start will leak. We make these molds with unscrewing cores that rotate out of the threads instead of stripping them.

Why unscrewing molds are complex

An unscrewing mold contains a mechanism inside the mold: threaded cores, gears or racks, bearings and a drive. In a fitting with several ports, cores may also need to pull in different directions. All of this has to fit around cooling and ejection without weakening the steel.

• Two cavities in AISI H13, cold runner, HASCO base.
• Threaded cores ground and polished to keep thread profile and surface consistent.
• Anti-rotation features in the cavity so the fitting stays still while the cores turn.
• Strict process control and fitting of moving parts to avoid wear and leaks over the mold life.

People and process

Our engineering team designs the action structure, and experienced toolmakers fit it under our quality system. Every unscrewing mold is proven on our presses: we check thread gauges, sealing faces and cycle time before shipment, so the mold you receive works as promised.

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.