砂型鋳造とは？利点、プロセス、用途

Introduction

Sand casting is one of the most widely used metal casting processes due to its versatility, simplicity, and cost-effectiveness. It involves using a sand mold to shape molten metal into a desired form, making it especially suitable for both small-batch production and large-scale industrial components.

What Is Sand Casting

Sand casting is a manufacturing technique where molten metal is poured into a cavity formed by a sand mold. The mold is created by packing special sand around a pattern that matches the shape of the final part. After removing the pattern, molten metal is poured into the cavity. Once cooled, the sand mold is broken to reveal the finished casting.

This method works with a wide range of metals, including iron, steel, aluminum, and brass.

Advantages of Sand Casting

• Low tooling and mold-making costs
• Compatible with most ferrous and non-ferrous metals
• Ideal for producing large or complex parts
• Flexible for both prototyping and production runs

Limitations of Sand Casting

• Rougher surface finish compared to precision methods
• 寸法精度が低い
• May require secondary machining

アプリケーション

• Machine bases
• Pump housings
• エンジンブロック
• Custom industrial components

Comparison Table

Casting Method	Cost	Strength	Precision	Best Applications
砂型鋳造	⭐⭐	⭐⭐⭐	⭐	Prototypes, machine bases, large parts
鋳鋼	⭐	⭐⭐⭐⭐⭐	⭐⭐⭐	Mining tools, valves, heavy-duty parts
Iron Casting	⭐⭐	⭐⭐⭐	⭐⭐	Auto parts, manhole covers, machine frames
アルミニウム鋳造	⭐⭐⭐⭐	⭐⭐	⭐⭐⭐⭐	Brackets, electronics, lightweight mechanical parts

結論

Sand casting remains a cost-effective and versatile solution for producing metal parts. By understanding its benefits and limitations, and comparing it with other casting methods like steel, iron, and aluminum casting, manufacturers can make informed decisions based on their specific requirements.

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