Product Info

Dies and plugs are fundamental tools in metal forming. While each has a distinct role—external shaping for dies, internal support for plugs—they work in tandem to improve accuracy, reduce defects, and extend tool life. This article offers a beginner-friendly overview for engineers, factory staff, or anyone curious about forming tools in industrial production.

■ What Are Dies and Plugs?
In metal forming methods such as extrusion, drawing, or sheet forming, dies and plugs are core components:
・ Die (Metal Mold): Shapes the outer contour of a workpiece under pressure.
・ Plug (Mandrel/Core): Supports the interior, controls wall thickness, and prevents collapse during forming.

When used together, they create dimensionally accurate parts that meet strict industrial standards.

■ Key Functions of Dies
Dies are engineered to suit various metal forming tasks:
・ Blanking Dies – Punch out flat parts or initial shapes
・ Forming Dies – Bend or contour the metal surface
・ Drawing Dies – Stretch materials into deeper shapes like cans or shells

These tools are often made from tool steel or cemented carbide to withstand repetitive high-pressure forming.

■ Plug Function and Importance
Working from the inside of the material, plugs help to:
・ Stabilize wall thickness
・ Prevent internal collapse or distortion
・ Distribute forming force evenly

Plugs are especially important in deep drawing processes and tubular part production, ensuring part integrity and structural stability.

■ Why Dies and Plugs Work Better Together
A well-designed die-plug system offers several production advantages:
・ Lower part distortion and deformation
・ Improved dimensional consistency
・ Reduced machine stress and maintenance
・ Faster production with fewer rejections

Example: In cup manufacturing, the plug supports the internal cavity, while the die shapes the exterior—resulting in strong, precise, and defect-free parts.

■ Conclusion: Why Basic Knowledge Helps Engineers and Factories
Understanding the role of dies and plugs helps improve production efficiency. It's not just about producing parts—it's about minimizing defects, improving SPC (Statistical Process Control), and extending tool lifespan. This knowledge is critical in automotive, electronics, and appliance manufacturing, where high volume and high precision are non-negotiable.

■ Featured Product: Carbide Dies and Plugs by FUJILLOY (THAILAND) CO., LTD.
FUJILLOY (THAILAND) CO., LTD. offers high-durability carbide Dies and Plugs designed for demanding metal forming applications. Manufactured under strict quality control, these tools deliver exceptional wear resistance and dimensional accuracy.

Key Product Features:
・ Long wear life for extended tool usage
・ Reduced cost per part
・ Enhanced production precision and process stability
・ Proven reliability in continuous high-load environments

Ideal for industries such as:
・ Automotive
・ Electronics
・ Aerospace

FUJILLOY also provides customization options to match specific production needs, supporting flexible and efficient manufacturing lines.

■ For more details, please download the pdf or feel free to contact us.

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