Precision Control of Hole Diameter and Hole Position Tolerances

In marine engine applications, crankshaft-related components require strict control of hole diameter and hole position tolerances to ensure accurate alignment, secure fastening, and stable engine operation. Shih Yeh addresses these requirements at the process design stage by evaluating the most suitable forming and machining methods based on tolerance demands, material behavior, and downstream surface treatment effects.

Through stable metal stamping and forming control, combined with defined process sequencing and dimensional management, critical hole features are consistently maintained within drawing specifications. This approach reduces assembly variation and supports reliable performance across mass production and long-term engine operation.

In mass production, failure to account for material springback and the dimensional impact of downstream anodizing can lead to assembly variation or rework risks. These factors are therefore evaluated early in the process design stage.

Profile Tolerance Management for Curved Surface Accuracy

In addition to hole-related tolerances, this component includes profile of surface tolerance requirements to ensure proper contact and load distribution within the marine engine structure. During manufacturing, Shih Yeh plans forming sequences and deformation control strategies to manage material flow and minimize distortion or springback that could affect surface profile accuracy.

By maintaining consistent forming conditions and process control, curved surface geometry is kept within specified profile tolerance limits, supporting structural stability, accurate assembly, and long-term durability in marine engine environments.

Semi-hard Anodizing for Corrosion Resistance and Surface Durability

This product is finished with clear anodizing, with semi-hard anodizing applied according to application requirements. The semi-hard anodizing process achieves a coating thickness of 20 μm or more, providing enhanced corrosion resistance, weather resistance, surface hardness, wear resistance, electrical insulation, and heat resistance.

Compared to standard anodizing, this thicker anodic layer is particularly suitable for marine engine components exposed to moisture, salt, vibration, and elevated temperatures over extended service periods.

Manufacturing Capability and Application Scope

This aluminum alloy formed component is suitable for parts that require medium material strength, good formability, and stable control of hole tolerances, surface profile accuracy, and overall dimensions. It is commonly used for crankshaft retainers, locating parts, and supporting structural components in marine engine systems.

In addition to marine engines, these manufacturing capabilities can also be applied to parts used in transportation equipment, power transmission systems, industrial machinery, and instrumentation. These applications often require lightweight design, corrosion resistance, and reliable assembly fit. Processing methods, tolerance requirements, and surface finishes are defined based on customer drawings and application needs to support stable mass production, consistent assembly quality, and long service life.

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