The lifespan of an injection mold is not fixed. With scientific maintenance and optimized operation, the average number of shots can be increased by 20–50% or more, significantly reducing per-part costs and minimizing downtime losses.
Core Maintenance Techniques
- Regular Cleaning After each shift or production cycle, use specialized solvents or compressed air to remove residual material, oil buildup, and corrosion from cavities, vents, sliders, and other areas. This prevents sticking, burn marks, or corrosion caused by accumulation.
- Adequate Lubrication Apply appropriate anti-rust lubricants to moving components (guide pillars, sliders, ejector pins, etc.) to reduce frictional heat and wear. Regularly inspect lubrication condition to avoid dry running.
- Preventive Inspection & Record-Keeping Maintain a mold history card to log every use, damage, and maintenance activity. Perform weekly/monthly checks for parting line wear, scratches, cracks, and loose ejector systems—detect and repair issues early.
- Optimized Process Parameters Set reasonable clamping force (avoid excessive stress), injection pressure/speed, and mold temperature tailored to the plastic material. This reduces thermal stress and mechanical fatigue.
- Proper Storage Protection When not in use, thoroughly clean, dry, and apply anti-rust oil. Store in a temperature-controlled, moisture-free environment to prevent corrosion.
- Surface Treatment Upgrades Apply nitriding or PVD coatings (e.g., TiN, DLC) to high-wear areas for dramatically improved wear and corrosion resistance.
- Operator Training Ensure staff follow standardized procedures to prevent overloads, improper ejection, or other misoperations that shorten mold life.
With good maintenance, P20 molds can easily exceed 500,000+ shots (from a typical 300,000), while hardened H13 steel molds can approach or surpass 1 million shots.