Detailed Introduction

This multi-cavity injection mold is professionally developed for automotive wiring harness connector housings, specially optimized for flame-retardant high-temperature PPO/PET composite plastics, matching automotive electrical parts’ requirements of heat resistance, insulation and long-term vibration stability.

The mold adopts split fixed-moving plate structure, supports single-cavity or multi-cavity modular customization according to connector pin counts (6P/12P/24P/48P/96P). Each connector cavity is an independent embedded insert, convenient for separate replacement and maintenance when switching different pin-size connectors. All molding surfaces adopt automotive standard uniform texture etching, avoiding gloss inconsistency and plastic flow marks easily generated during PPO/PET injection molding, no secondary surface treatment required after molding.

Independent distributed cooling pipelines are laid out for every single cavity, which precisely balance mold temperature during high-temperature PPO/PET injection, effectively restrain internal stress, part warpage and uneven shrinkage unique to PPO/PET material. Built-in precision slide interlock locking blocks maintain stable clamping force under long continuous high-temperature production, prevent thin-wall latch structure flash and burrs, extend mold service life under long-term PPO/PET high-temperature processing. Multi-slide side core pulling mechanism is integrated to form complex buckle, lock and terminal positioning structures on connector housings in one molding cycle.

Complete Precision Machining Workflow

1. 5-axis CNC rough milling for mold base outline and cavity rough forming
2. Vacuum stress relief heat treatment to stabilize steel hardness, reduce thermal deformation under long-term PPO/PET high-temperature molding
3. Precision surface grinding to control mold plate flatness and parallelism within ±0.002mm
4. Sinker EDM & wire cut WEDM for ultra-fine thin-wall buckle and terminal slot contour of automotive connectors
5. Automotive-grade uniform texture etching, matched with PPO/PET fluidity to optimize cavity surface finish
6. Optional non-toxic anti-corrosion surface coating compatible with flame-retardant PPO and PET automotive engineering plastics

All mold core, cavity and structural components complete full 3D coordinate measurement inspection to meet strict automotive electronic drawing tolerance standards. Full customization is supported based on customer connector samples or engineering drawings: cavity quantity, mold steel grade, cooling channel layout and texture depth can be adjusted according to PPO/PET material ratio, IP protection grade requirements and daily production capacity. The modular multi-cavity layout significantly improves molding efficiency while unifying dimensional consistency and surface texture of multi-color automotive wiring harness connectors.

Specification Table

Product Application Note

The molded parts shown in the picture cover multi-pin low-voltage signal connectors, multi-row power distribution connectors and high-voltage lockable connectors, widely used in passenger cars, new energy EVs and engineering machinery, all applicable to this PPO/PET dedicated precision injection mold solution.