Hardened Plates
Hardened plates backing core pins for extended mold life.
Backing Plate Pairing Guide
Core pins transmit massive localized compressive forces. If the backing plate is too soft, the pin heads will indent the plate, causing the pins to sink and altering wall thickness.
| Pin Type / Force | Required Backing Plate Material | Minimum Hardness | Risk if Under-Spec'd |
|---|---|---|---|
| Standard Ejector Pins (Low Force) | S45C (Standard Carbon Steel) | HRC 20-25 | Minor hobbing over 500k cycles |
| Block Core Pins (Med Force) | P20 / NAK80 (Pre-hardened) | HRC 35-40 | Pins sink 0.1mm, causing flash |
| Large Cavity Inserts (Extreme Force) | SKD11 / H13 (Fully Hardened) | HRC 55-60 | Severe plate indentation, dimensional failure |
Application Scenarios
High-Pressure Thin-Wall Molding
Injection pressures exceed 1500 bar. Core pins act like punches, trying to drive into the back plate.
Recommended:SKD11 Hardened Plates (HRC 58)
Multi-Cavity Interchangeable Molds
Frequent changeovers of core pins lead to wear on the backing plate surface.
Recommended:Pre-Hardened NAK80 Plates
Design Rule: The backing plate hardness must be equal to or greater than the core pin head hardness to prevent indentation.
📖 In-Depth Technical Guide: Read our detailed engineering guide on How to Prevent Core Pin Hobbing →
Technical Resources
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