Mold finish standards

Mold Surface Treatment Standards (2025 Update)‌

‌1. Quick Selection Guide‌

Select surface treatment processes based on mold material, application, and cost requirements:

2. Key Process Parameters & Limitations‌

1. ‌Nitriding‌:

   • Case Depth: 0.1-0.3 mm (Temperature: 500-550°C)

   • Limitation: Not suitable for mold steel with copper content >0.5%

2. ‌PVD Coating (TiAlN/DLC)‌:

   • Coating Thickness: 2-5 μm, Temperature Resistance ≤800°C

   • Pre-Polishing Required: Ra ≤0.2 μm

3. ‌Hard Chrome Plating‌:

   • Plating Thickness: 10-50 μm, Hydrogen Embrittlement Risk (Post-Treatment: 200°C/4h Dehydrogenation)

   • Compliance: Meets ‌EU RoHS 2025‌ hexavalent chromium limits

‌3. Mold Design Optimization‌

1. ‌Avoid Failure-Prone Features‌:

   • Sharp Internal Corners: Fillet radius ≥‌0.3 mm‌ (prevents coating delamination)

   • Deep Grooves/Fine Holes: Width/Diameter ≥‌1 mm‌ (ensures coating uniformity)

2. ‌Lifespan Enhancement Strategies‌:

   • High-Wear Areas: Local Laser Cladding + ‌Nano-Composite Coating‌ (lifespan increase ‌300%‌)

   • Cooling Channels: Electrolytic Polishing (Ra ≤0.8 μm, reduces scale buildup)

‌4. 2025 Industry Breakthroughs‌

• ‌Smart Self-Healing Coating‌:

  • Microcapsule Slow-Release Technology: Repairs scratches ≤20 μm depth

  • Temperature Range: -30°C~250°C (compliant with ‌ISO 21714:2025‌)

• ‌Cryogenic Plasma Sulfurizing‌:

  • Friction Coefficient Reduced to ‌0.02-0.05‌ (ideal for precision injection molds)

  • Processing Time: 30-60 mins, Cost: ¥6-10 CNY/cm²

‌5. Acceptance Criteria & Grading‌

Notes‌:

1. Custom solutions (e.g., acid-resistant or anti-stick coatings) require hybrid treatments (e.g., CrN+PTFE composite coatings);

2. All processes must comply with ‌ISO 9001:2025‌ quality control certification.