Tweeler AB is a precision aluminium die casting company based in Stockholm, Sweden, specialising in custom mould design, HPDC, re-engineering, and global logistics.
A die casting mould is a significant capital investment — often €5,000 to €50,000 or more. Proper maintenance protects that investment, extends tool life, and keeps part quality consistent over hundreds of thousands of cycles.
How Long Should a Die Casting Mould Last?
The lifespan of an aluminium die casting mould depends on the alloy, part complexity, and maintenance. As a general guide, a well-maintained H13 steel mould casting aluminium can be expected to produce:
| Part size / complexity | Typical mould life |
|---|---|
| Small, simple parts | 200,000–500,000+ shots |
| Medium parts | 100,000–200,000 shots |
| Large or complex parts | 50,000–100,000 shots |
Why Aluminium Is Hard on Moulds
Aluminium is cast at around 660–700°C and injected at high velocity and pressure. This subjects the mould to repeated thermal cycling, erosion from the fast-moving metal, and chemical attack (soldering, where aluminium bonds to the steel surface). Maintenance slows that degradation.
Preventive Maintenance Schedule
Every shift / daily
- Visual inspection for cracks, soldering, and damage
- Cleaning of the mould face and vents
- Checking and applying release agent correctly
- Verifying cooling line flow
Periodic (every 5,000–20,000 shots)
- Detailed inspection of cavity surfaces
- Cleaning of cooling channels to remove scale buildup
- Inspection and lubrication of ejector pins and slides
- Polishing of minor surface defects before they grow
Major maintenance (as needed)
- Welding and re-machining of worn or cracked areas
- Replacement of worn ejector pins, core pins, and slides
- Re-texturing or re-polishing of cavity surfaces
- Re-nitriding of the surface to restore hardness
Heat Checking — The Most Common Wear Mode
Heat checking is a network of fine surface cracks that develops on the mould cavity from repeated thermal cycling. It is the most common end-of-life mechanism for aluminium die casting moulds. Caught early, the affected area can sometimes be polished or re-worked. Left unchecked, the cracks deepen and the cavity must be welded and re-machined or replaced.
Soldering
Soldering occurs when molten aluminium chemically bonds to the steel mould surface, causing parts to stick and tear. It is managed through correct release agent application, proper mould temperature, optimised gate design, and surface treatments such as nitriding.
Proper Storage Between Runs
Before storage, the mould should be cleaned, coated with a rust preventive, and stored in a dry, temperature-stable environment. Cooling lines should be blown out to prevent internal corrosion.
Signs Your Mould Needs Attention
- Increasing flash at the parting line (worn or damaged faces)
- Fine raised lines on parts (early heat checking)
- Parts sticking or tearing on ejection (soldering or worn draft)
- Dimensional drift over a production run
- Surface finish degradation on the part
Tweeler AB maintains all customer tooling to a documented preventive maintenance schedule — protecting your investment and keeping part quality consistent shot after shot. Your mould remains your property and is cared for as such.
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