Detailed Introduction

This multi-cavity injection mold is professionally customized for full series PFA fluid pipeline fittings, fully adjusted for PFA’s high melt viscosity, high chemical inertness and high molding temperature characteristics, effectively solving PFA typical molding defects such as obvious weld lines, thread shrinkage and transparent part haze.

The split fixed-moving two-plate mold adopts symmetrical multi-row interchangeable cavity layout to realize simultaneous production of all fittings shown in the image: straight union connectors, 90° elbow joints, T-type three-way connectors in multiple sizes. Each multi-angle complex pipeline fitting cavity is an independent embedded insert for quick disassembly, replacement and deep residue cleaning. All molding surfaces adopt multi-stage high-gloss polishing matched with PFA high-temperature melting state, which greatly reduces surface flow marks and internal pipeline dead corners, eliminating secondary deburring and polishing processes after molding.

Independent distributed cooling pipelines are arranged for each cavity to precisely control mold temperature during continuous high-temperature PFA injection molding, effectively restraining uneven shrinkage of threaded sections, deformation of curved elbow walls and dimensional deviation of three-way branch ports. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle high-temperature mass production, avoid flash on fine thread and thin-wall connecting ends, and extend mold service life under cyclic fluoropolymer high-temperature processing.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and complex multi-angle pipeline cavity rough forming
2. Vacuum stress relief heat treatment to stabilize steel hardness and reduce thermal deformation under long-term high-temperature PFA molding
3. Precision surface grinding to control mold plate flatness & parallelism within ±0.002mm
4. Sinker EDM & Wire Cut WEDM for ultra-fine thread, curved elbow and three-way branch contour features
5. Multi-stage high-temperature resistant high-gloss polishing optimized for PFA melt fluidity
6. Optional anti-corrosion surface coating compatible with high-purity industrial & medical PFA raw materials

All mold core, cavity and structural components complete full 3D coordinate measuring inspection to satisfy strict high-purity fluid pipeline drawing tolerance standards. Full customization is supported based on PFA fitting samples or engineering drawings: cavity quantity, mold steel grade, cooling circuit layout and polishing grade can be adjusted according to PFA purity grade, chemical fluid resistance requirements and daily production capacity. The modular multi-cavity layout greatly improves molding efficiency while unifying thread sealing accuracy, pipeline transparency and interchangeable dimensional consistency of all PFA fluid pipeline fittings.

Specification Table