Detailed Introduction

This multi-cavity injection mold is customized for one-piece PFA manual clamp flow control valve fittings, fully adjusted for PFA’s high melt viscosity, outstanding chemical inertness and high-purity property to resolve typical PFA molding defects including uneven thick-thin wall shrinkage, curved handle weld lines and threaded port dimensional deviation.

The split fixed-moving two-plate mold adopts symmetrical multi-row single-part cavity layout to realize mass production of the integrated clamp flow control fitting shown in the picture, which integrates 90° clamping handle, threaded inlet/outlet ports and internal flow channel housing as one single molded piece. Each complex multi-feature fitting cavity is an independent embedded insert for quick disassembly, replacement and deep residue-free cleaning. All molding contact surfaces adopt multi-stage high-temperature resistant high-gloss polishing matched with PFA melting characteristics, eliminating micro burrs and internal fluid dead corners and removing post-molding secondary polishing procedures.

Independent distributed cooling pipelines are arranged for every single cavity to precisely stabilize mold temperature during continuous high-temperature PFA injection molding, effectively restraining curved handle deformation, thick-thin wall uneven shrinkage and threaded port flash. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle high-temperature cleanroom mass production, avoiding micro flash on fine thread and thin-wall transition sections, and extending mold service life under cyclic fluoropolymer high-temperature molding.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and integrated multi-feature clamp fitting cavity rough forming
2. Vacuum stress relief heat treatment to stabilize steel hardness and reduce thermal deformation under long-run 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 threaded port, curved clamping handle and internal flow channel contours
5. Multi-stage high-temperature resistant high-gloss polishing optimized for PFA melt fluidity
6. Optional anti-corrosion surface coating compatible with high-purity semiconductor & biopharmaceutical PFA raw materials

All mold core, cavity and structural components complete full 3D coordinate measuring inspection to satisfy strict high-purity fluid control equipment drawing tolerance standards. Full customization is supported based on PFA clamp fitting samples or engineering drawings: cavity quantity, mold steel grade, cooling circuit layout and polishing grade can be adjusted according to PFA purity grade, corrosive fluid resistance requirements and daily production capacity. The symmetrical multi-cavity layout greatly improves molding efficiency while unifying thread sealing precision, handle assembly flatness and internal channel smoothness of integrated PFA manual flow control fittings.

Specification Table