Detailed Introduction

This multi-cavity injection mold is customized for complete PFA micro diaphragm valve assemblies, fully optimized for PFA’s high melt viscosity, excellent chemical inertness and high-purity property to solve PFA typical molding defects such as thick-thin wall uneven shrinkage, diaphragm warpage and thread weld lines.

The split fixed-moving two-plate mold adopts symmetrical multi-row interchangeable cavity layout to realize mass production of all displayed parts: square two-way valve main body, thin transparent diaphragm sheets, threaded locking caps, positioning retaining rings and small threaded connecting nozzles. Each complex multi-feature valve component 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 removes micro burrs and internal fluid dead corners, eliminating secondary post-molding deburring and polishing processes.

Independent distributed cooling pipelines are arranged for each cavity to precisely control mold temperature during continuous high-temperature PFA injection molding, effectively restraining thin diaphragm sheet bending, valve body wall shrinkage and threaded port dimensional deviation. Built-in precision interlock slide locking blocks maintain stable clamping force under long-cycle high-temperature mass production, avoid flash on ultra-thin diaphragm edges and micro thread structures, and extend mold service life under cyclic fluoropolymer molding.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and complex square valve body & thin diaphragm 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 thread, ultra-thin diaphragm and square valve body inner 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 & medical PFA raw materials

All mold core, cavity and structural components complete full 3D coordinate measuring inspection to satisfy strict ultra-clean fluid control valve drawing tolerance standards. Full customization is supported based on PFA diaphragm valve 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 modular multi-cavity layout greatly improves molding efficiency while unifying diaphragm flatness, thread sealing precision and fluid channel smoothness of complete PFA micro diaphragm valve assemblies.

Specification Table