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CNC Machining Common Metals: A Guide to Internal Angle Limitations and Surface Finishes

模型製作, 模型生產, 治具製作廠商, 模具製作廠商, 測試治具製作, 產品模型製作, 模型製作公司, 塑膠模型製作, 模型 翻模, 公仔模型製作, 公仔生產, 客 製 化模型 公仔, 樹脂公仔製作, 矽膠模具製作, pvc模型製作, 金屬模具製作, 模具製作廠商, 簡易模具製作, 塑膠模具製作流程, 矽膠模具製作, 模具開發流程, 模具設計, 塑膠模具製作流程, 模具加工流程, 汐紫模型, 3d列印代工推薦, 3d列印矽膠模具, 橡膠3d列印, 3d列印翻模, 矽膠 翻模 代 工, 3D 列印 代工 學生, 光固化代印價格, 3d列印模型, 3d列印模型製作, 3d列印公仔, 3d列印圖檔製作, 3d列印廠商, 大型3d列印代工

CNC Machining Common Metals: A Guide to Internal Angle Limitations and Surface Finishes

Introduction

The design of metal parts requires considerations beyond strength and performance; processability and final appearance are also key factors in determining a product’s value. Understanding the internal angle limitations of different metals during CNC machining and the diverse surface finishes available can help ensure your designs are both aesthetically pleasing and manufacturable.

Detailed Explanation of Metal Material Machining Characteristics

Stainless Steel (e.g., SUS304, SUS316)

Internal Angle Limitations: Due to the exceptional hardness and toughness of stainless steel, the recommended minimum internal corner radius (R) is R ≥ 0.2 mm. Using tools smaller than this significantly increases costs and the risk of tool breakage.

Surface Finishes: Stainless steel can be finished in a wide variety of ways. It can be polished to a high-gloss mirror finish or brushed (hairline) for a matte finish. It can also be sandblasted, painted, powder-coated, and coated with a rich variety of colors using PVD (physical vapor deposition) coatings, encompassing a wide range of applications.

Aluminum Alloy (e.g., AL6061, AL6063)

Inside Corner Restrictions: Aluminum alloy is relatively soft and has good machinability. The recommended minimum inside corner radius is R ≥ 0.4 mm.

Appearance Treatment: The most distinctive appearance treatment for aluminum alloy is anodizing, which creates a hard protective layer in a variety of colors. Other common treatments include sandblasting, brushing, painting, powder coating, and PVD coating. These treatments are often preceded by a conversion coating to enhance coating adhesion.

Magnesium Alloy (e.g., AZ91D, AZ31B)

Inside Corner Restrictions: The machinability of magnesium alloy is similar to that of aluminum alloy. The recommended minimum inside corner radius is R ≥ 0.3 mm.

Appearance Treatment: Due to the poor corrosion resistance of magnesium alloy, appearance treatment combines aesthetics with necessary protective functions. Common treatments include conversion coating, anodizing, painting, and powder coating. Adequate surface protection is crucial for ensuring the durability of magnesium alloy parts.

Key Glossary

  • Minimum Inner Corner Radius: Also known as the R-angle. Because CNC machining uses cylindrical milling cutters, the inner corners of a part cannot be machined to a perfect 90° angle. Instead, a circular arc corresponding to the tool radius is left. The minimum radius of this arc is the inner corner limit. Designing for a larger R-angle than the limit not only significantly reduces machining difficulty and cost, but also effectively distributes stress and improves the structural strength of the part.

Conclusion

Exquisite surface finishes can significantly enhance the perceived value of metal products. Stainless steel offers the most diverse texture options, while aluminum alloy anodizing combines aesthetics and protection. Magnesium alloys require a reliable surface treatment to ensure their applicability. Considering R-angle limits and surface finishes during the design phase will streamline your product development process.