Detailed Introduction

This two-plate fan impeller mold is specially developed for high-gloss plastic fan blade forming, effectively solving surface flow marks, blade dimensional deviation and demolding scratch problems during injection molding.

The mold is separated into front fixed plate and rear moving plate. The fixed side holds smooth outer contour insert of fan housing, while moving side carries integral multi-blade core to form complete fan impeller in one molding cycle. Four large-diameter guide pins at mold corners realize high-precision alignment during repeated opening and closing; square locking insert frame enables independent disassembly of fan core for polishing, maintenance or size modification without replacing the whole mold base. All inner cavity surfaces are processed to mirror finish to reduce plastic melt friction and deliver flawless glossy fan surface without secondary trimming.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and cavity rough forming
2. Vacuum heat treatment to stabilize steel hardness and minimize thermal deformation under long high-temperature injection
3. Precision surface grinding to control mold plate flatness and parallelism within ±0.002mm
4. Sinker EDM & wire cut WEDM for complex curved fan blade micro contours
5. Multi-step ultra-fine mirror polishing to eliminate tool marks and achieve high-gloss cavity surface
6. Optional PVD wear-resistant coating for inserts molding glass-fiber reinforced plastic

All mold components pass full 3D coordinate measuring inspection to comply with drawing tolerance standards. Custom development is fully supported based on customer fan samples or 2D/3D drawings: mold steel grade, blade quantity, cavity depth and surface treatment can be adjusted according to plastic material, daily output and service life requirements. The split plate layout simplifies mold installation and daily maintenance, greatly lowering reject rates of miniature cooling fan impellers.

Specification Table