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Cut the aluminum polishing process in half!
Streamline deburring and finishing with a “rubber grinding stone” that requires no wiping
In aluminum processing, “wiping off polishing compounds,” “a high number of process steps,” and “variation in finish quality” are common challenges across many production sites.
In conclusion, by reviewing tool selection, it is possible to perform deburring and finishing simultaneously and consolidate processes.
In particular, elastic rubber grinding stones contribute to improved efficiency through an approach different from conventional polishing processes.
Characteristics of Conventional Aluminum Polishing Processes
In general, aluminum polishing processes consist of multi-stage operations combining conventional grinding wheels, abrasive papers, and buffing with polishing compounds.
This is done to refine surface roughness by gradually using finer abrasive grain sizes (grit numbers).
Typical Process Example
- #80–#400: Rough processing (including deburring)
- #600–#800: Intermediate finishing
- Polishing compound + buff: Final finishing (Ra varies depending on conditions)
Why These Issues Occur (Understanding from Grinding Wheel Structure)
In aluminum processing, the following problems are likely to occur:
- Loading of grinding wheels and abrasive papers
- Residual polishing compound and wiping workload
- Uneven finish due to variation in applied pressure
Although these may appear to be separate issues, they all originate from chip accumulation and unstable contact conditions.
Grinding wheels are generally composed of abrasive grains, bonding material (bond), and pores, where pores play a role in discharging chips.
However, in soft materials such as aluminum, chips tend to adhere easily, leading to:
- Pores becoming filled, causing loading
- Reduced effectiveness of abrasive grains
- Increased friction, making the process more sensitive to applied pressure
These phenomena make variations in finish quality and additional work within the process more likely.
Typical Improvement Methods
The following measures are commonly taken:
- Polishing under low load
- Increasing the number of steps by refining grit sizes
- Frequent dressing or tool replacement
Why These Measures Are Still Insufficient
While these methods are effective for maintaining grinding wheel performance, issues such as increased process steps and operator dependency remain.
Especially in polishing processes where loose abrasives are used, abrasive grains are not fixed, resulting in low reproducibility. In addition, wiping and cleaning processes are unavoidable, making it difficult to reduce overall process workload.
Differences by Tool (Performance Comparison)
| Item | Conventional Grinding Wheels / Papers / Compounds | Elastic Rubber Grinding Stones |
|---|---|---|
| Loading | Occurs easily | Less likely to occur |
| Surface Finish Quality | Prone to variation | More stable |
| Workability | Many process steps | Process consolidation possible |
| Durability | Requires dressing, wears easily | Maintains performance more easily |
Why Rubber Grinding Stones Are Suitable (Structural Perspective)
Elastic rubber grinding stones follow the shape of the workpiece while processing due to the cushioning properties of rubber.
In addition, by facilitating chip discharge, they suppress loading and help maintain the effectiveness of abrasive grains.
Due to these characteristics, material removal (grinding) and finishing (polishing) can be performed simultaneously, making it possible to eliminate polishing processes in some cases.
Practical Applications in the Field
Automotive Parts (Aluminum Housing)
In post-machining deburring processes, rubber grinding stones equivalent to #80–#220 are used to simultaneously remove burrs and stabilize surface roughness (values vary depending on conditions).
Polishing processes can be eliminated, and wiping operations may become unnecessary.
Semiconductor Equipment Components
For edge finishing of precision aluminum parts, the elastic followability suppresses excessive material removal while maintaining uniform contact, contributing to both fine finishing and shape retention.
Mold Components
In detailed finishing processes, they can handle localized machining that is difficult with abrasive paper, leading to process reduction in some cases.
Changes After Implementation (Based on Processing Theory)
- Reduced working time through process reduction
- Stable quality through sustained abrasive action
- Reduced workload through shorter processes
- Reduction of post-processes (cleaning and wiping)
Although these vary depending on conditions, they represent an example of how differences in grinding wheel structure and action affect processing results.
Summary
In aluminum polishing, issues are often not simply caused by processing conditions but by tool selection.
Elastic rubber grinding stones offer the potential for process consolidation by suppressing loading and enabling simultaneous processing.
Since the optimal solution varies depending on site conditions, it is important to consider tool selection based on current processes and challenges.
Actual applicability depends on work material, shape, and conditions, so evaluation based on on-site conditions is recommended.
