Steel lost wax casting

aluminumbronzeautomotive

Hansheng Automation has been deeply involved in the foundry industry for many years, offering precision casting parts services for various manufacturers. The lost foam casting process uses polystyrene plastic to create molds, which are not reusable. This process allows for a short casting cycle, supports complex structures, and is suitable for producing oversized parts. Technical Features: - Molds are not reusable. - Short casting cycle with CNC automatic mold-making equipment. - Supports complex structures with internal cavities and thin walls. Lost Foam Casting Process: 1. Model Preparation: Use of expanded polystyrene (EPS) to make molds. 2. Coating Treatment: Covering the foam mold with a fire-resistant coating. 3. Material Selection and Melting: Metal materials melted in the furnace. 4. Sand Filling and Pouring: Mold placed in a container with sand and molten metal poured. 5. Stripping and Finishing: Removal of casting from the container and CNC finishing if needed. Common Materials and Applications: Material | Examples | Applications ---|---|--- Cast Iron | HT250/HT300/QT200 | Machine tool bed, engine housing Cast Steel | ZG270-500/ZG20Cr13 | Mining machinery, corrosion-resistant valves Cast Aluminum | A356/ZL104 | Automobile wheels, aviation brackets Cast Bronze | C90300/C95500 | Marine accessories, wear-resistant bearings Differences from Other Casting Processes: Aspect | Lost Foam Casting | Sand Casting | Investment Casting ---|---|---|--- Precision | CT7-CT9 (±0.3mm) | CT10-CT12 (±1.0mm) | CT4-CT6 (±0.1mm) Surface Roughness | Ra3.2-12.5μm | Ra12.5-50μm | Ra1.6-6.3μm Minimum Wall Thickness | 3mm (steel), 2mm (aluminum) | 5mm | 0.5mm Batch Adaptability | Suitable for medium to large quantities (>1000 pieces/year) | Suitable for small batches | Suitable for small batches with high added value Cost | Low tooling cost (EPS model) | Medium mold cost | High mold cost (wax mold + ceramic shell) FAQ: - Are lost foam castings suitable for producing oversized parts? Yes, castings up to 10 tonnes can be produced, but large flasks and dedicated shakers need to be customized. - How to solve the problem of carburization of steel castings? The STMMA model is used, and a decarburizer is added during pouring, with the pouring temperature controlled ≥ 1550°C. - What types of castings are not suitable for the lost foam process? Lost foam casting has clear restrictions on materials and structures: the most suitable gray cast iron, low carbon steel, and alloy steel need special treatment.