Detailed Introduction

Multi-step tapered core pins are core functional molding components for precision injection molds. Their segmented stepped and tapered profiles are used to fabricate multi-layer stepped through-holes and complex internal positioning structures on miniature plastic products. The dimensional consistency of each step and coaxiality of the whole pin directly control the assembly fit and dimensional tolerance of finished plastic parts. Slotted variants can realize special undercut or wire routing slot forming in one molding cycle.

All core pins adopt full-process precision manufacturing workflow: CNC contour turning for multi-step tapered profiles, vacuum heat treatment to achieve stable high hardness, multi-stage ultra-precision cylindrical grinding to eliminate step runout, EDM fine cutting for customized side slots, and superfinishing to achieve smooth low-friction surfaces. Each finished pin undergoes full inspection of concentricity, step diameter and roundness to eliminate hole taper, step size deviation and plastic sticking defects.

Customization is supported based on 2D/3D drawings or plastic product samples. Step count, taper angle, slot structure and material grade can be adjusted according to injection temperature, plastic material and production output to meet long-term stable precision molding requirements of micro multi-diameter plastic components.

Specification Table