Causes and Solutions for Aluminum Polishing Issues | How to Prevent Clogging, Burning, and Poor Finish Quality

In aluminum polishing, loading, burning, and poor surface finish tend to occur frequently, and the results vary significantly depending on tool selection.
In conclusion, there are cases where conventional grinding wheels and abrasive papers are insufficient, making it important to select tools that can suppress loading while achieving both material removal and finishing.

Characteristics of Common Issues in Aluminum Polishing

Aluminum is soft and highly ductile, making it prone to generating chips during polishing, which easily adhere to tools. As a result, the following problems occur:

Main Causes of Loading, Burning, and Poor Surface Finish

・Chips enter between abrasive grains, causing loading
・Frictional heat increases, leading to burning and discoloration
・Abrasive grain effectiveness decreases, resulting in unstable surface roughness (Ra)

Conventional Polishing Methods and Their Limitations

Grinding wheels and abrasive papers are commonly used; however, challenges remain in aluminum processing.

Typical Improvement Methods and Their Limits

・Using finer grit sizes (e.g., #240 → #400)
・Reducing rotational speed to suppress heat generation
・Lowering polishing pressure

While these methods can provide temporary improvements, in many cases they do not fundamentally resolve loading, resulting in variations in workability and reproducibility.

Differences by Tool and Suitability of Rubber Grinding Stones

The stability of polishing results largely depends on tool characteristics. A comparison of typical tools is shown below:

Item	Conventional Grinding Wheels / Abrasive Papers	Elastic Rubber Grinding Stones
Loading	Occurs easily	Less likely to occur
Surface Finish Quality	Prone to variation	More stable
Workability	Frequent replacement required	Suitable for continuous operation
Durability	Wears quickly	Relatively stable
Reproducibility	Operator-dependent	More consistent

Why Rubber Grinding Stones Are Suitable

Rubber grinding stones distribute contact pressure through their elastic (cushioning) properties, reducing localized penetration into the workpiece. In addition, their self-sharpening action (new abrasive grains are continuously exposed) helps maintain cutting performance and suppress the progression of loading.

Furthermore, since material removal and finishing proceed simultaneously, it becomes possible to achieve both process reduction and stable quality.

Practical Applications in the Field

Deburring and Finishing of Aluminum Parts

・Deburring of aluminum housings for automotive components
・Finishing of lightweight aluminum parts for aerospace applications
・Precision polishing of semiconductor manufacturing equipment components

For example, grit sizes from #320 to #600 are selected according to the application, and surface roughness (Ra) is adjusted based on finishing requirements. These values are only examples and vary depending on processing conditions and material properties.

Expected Changes After Implementation

・Improved work efficiency due to reduced loading
・Reduced rework through more stable surface quality
・Lower process cost through reduced tool replacement frequency

Especially for materials like aluminum that are prone to loading, differences in tool characteristics directly translate into differences in quality.

Summary

In aluminum polishing, many issues arise not simply from processing conditions but from tool selection. When conventional methods do not provide improvement, it is effective to consider tools that can suppress loading while achieving both removal and finishing.

Rubber grinding stones have the characteristic of facilitating chip discharge through rubber elasticity and suppressing loading. This helps maintain abrasive grain effectiveness and enables stable material removal and polishing.

By selecting tools suited to actual operating conditions, it becomes possible to optimize the balance of quality, workability, and reproducibility. Since applicability depends on work material, geometry, and conditions, it is important to evaluate and consult on a case-by-case basis.

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