Case

A professional aluminum die casting manufacturer focusing on automotive components and consumer electronics housings was encountering tough challenges in surface finishing of aluminum die castings. The company mainly produces aluminum die cast parts such as automotive battery cases, electronic device shells, and precision structural components, which are lightweight and high-strength but prone to surface defects after die casting, including mold release agent residues, oxidation layers, burrs, and flow marks.

Before cooperating with Suzhou Guangu, the manufacturer adopted traditional mechanical polishing and manual grinding. This method was inefficient for aluminum die castings—soft aluminum material was easily scratched or deformed during rigid polishing, leaving micro-scratches and uneven surfaces that failed to meet the required Ra value of ≤0.8μm for subsequent anodizing or powder coating. The scrap rate reached 15%, and manual polishing was labor-intensive, with a single batch of 150 aluminum die cast parts taking 4 hours, seriously delaying production schedules and increasing labor costs.

To solve these pain points, the manufacturer chose Suzhou Guangu’s customized magnetic metal polishing machine, specifically designed for aluminum die castings. Guangu’s machine adopts advanced 3D dynamic magnetic field technology, driving magnetic abrasive particles to form a flexible “magnetic brush” that can penetrate the tiny gaps, parting lines, and blind holes of aluminum die castings, achieving 360-degree non-dead-angle polishing without damaging the parts’ precision structure or causing deformation.

The effect after implementation was significant. The polishing machine effectively removed burrs, oxidation layers, and flow marks on aluminum die castings, reducing the surface roughness to Ra 0.08-0.8μm, which perfectly met the pre-treatment requirements for anodizing and powder coating. The scrap rate dropped from 15% to less than 0.3%, and production efficiency increased by 4 times—single-batch processing of 150 aluminum die cast parts takes only 30 minutes. The closed polishing process with water-based grinding fluid avoids dust pollution and fire risks caused by aluminum dust, complying with green manufacturing standards.

“Suzhou Guangu’s metal polishing machine has solved our long-standing aluminum die castings finishing problems,” said the manufacturer’s production director. “It not only ensures the surface quality of our products but also greatly improves production efficiency and reduces labor and material costs.” This case proves that Suzhou Guangu’s metal polishing machines provide efficient, stable, and cost-effective surface finishing solutions for aluminum die castings, empowering manufacturers to enhance product competitiveness in automotive and consumer electronics industries.