Traditional Filtration VS Fiberglass Mesh Filter For Molten Metal Filtration

Aluminum alloy wheel hubs are fundamental components in modern vehicles, and their quality hinges significantly on the purity of the molten aluminum. The traditional low-pressure casting method for producing these wheel rims has long relied on filtration to remove impurities. However, conventional filtration techniques present significant challenges, leading to increased costs and compromised product integrity.

The Limitations of Traditional Filtration VS Fiberglass Mesh Filter

Historically, the aluminum wheel hub casting industry has primarily used two types of filters:

The Iron Wire Mesh Dilemma VS Fiberglass Mesh Filter:

The common practice involves inserting an iron mesh filter into the sprue before each casting. While simple and low-cost, this method comes with critical drawbacks:

• Contamination & Cost: Iron mesh inevitably remains in the riser of the cast part. Post-drilling, the iron-laden aluminum chips require specialized de-ironing treatment before recycling, significantly increasing recycling costs and inventory turnover.

• Material Brittleness: The presence of iron mesh can increase the overall iron content within the aluminum alloy wheel hub rough material, leading to undesirable brittleness.

• Casting Instability: Iron mesh can accelerate the cooling rate of the riser, negatively impacting mold casting stability and increasing the product’s defect rate.

• Usability Issues: The common “soup bowl” shape of iron mesh is inconvenient for handling and prone to misplacement during installation.

The Fatal Flaws of Ceramic Filters VS Fiberglass Mesh Filter:  

While ceramic filter plates are a standard in some applications, they possess critical limitations for precise molten aluminum filter needs:

• Inconsistent Filtration: Controlling the exact pore diameter of ceramic filter plates during production is challenging, leading to significant variations in pore size between batches. This directly affects the molten aluminum flow rate and filtration consistency.

• Fragility Risk: Ceramic filter plates are inherently brittle and prone to breakage, especially when impacted by the molten melt diverter cone. Fragments can directly enter the liquid metal, leading to scrapped aluminum wheel hubs.

 The Fiberglass Mesh Filter Advantage......

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