Forming Extrusion Dies
Green Oak Tool designs precision forming extrusion dies that can be made to create a product profile of any size or shape. Forming dies can produce a simple cross-section extrusion or a complex shaped design. They are suited for extruding pipes, hollows and tubes.
Benefits of Forming Dies
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Can be used to produce a wide range of shapes from solid slugs to multi-cell monolith
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Can produce exact final product requirements at a high rate with high quality
Types of Forming Dies:
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Embossing dies
Embossing dies use tension to stretch metal into a shallow depression. The die set primarily is composed of a punch and a cavity. The metal thickness, mechanical properties, and the forming punch geometry determine the depth that can be achieved.
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Coining dies
Coining dies create the part shape by squeezing metal under extreme pressure. Coining also can reduce the metal thickness. A simple round metal slug is placed into the die and compressed, forcing it to flow into a given shape.
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Solid form dies
Solid form dies or dead hit dies are also called crash forming dies. They deform metal using only a punch and cavity. Solid form dies do not control metal flow and cannot prevent the metal from wrinkling or buckling. They’re used to form simple parts made from thick metals that are more wrinkle-resistant than thinner metals. Examples of these are brackets and braces.
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Bending dies
Bending dies deform a metal along a straight axis. They can create tabs and channels in the metal part. The various bending methods are wipe bending, V bending, and rotary bending. Compression and tension occur during the bending process, with compression occurring on the inside radius and tension occurring on the outside radius.
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Restrike dies
Restrike dies involve a solid forming operation. A restrike die is used after most of the major forming has been performed. The restrike die finishes forming features that could not be achieved in a previous operation. Restrike dies add details such as sharp radii and small embosses. They also help compensate for springback that can occur during the initial forming.
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Drawing dies
Drawing dies create a part shape by controlling metal flow into a cavity and over the forming punch. Some examples are oil pans, fenders, automobile doors, and door knobs. Draw dies use a pressure-loaded plate or ring, called a draw pad or blank holder, to control the metal flow into the cavity. The plate prevents the metal from wrinkling. By increasing or decreasing the pressure exerted under the pad, it controls how much metal feeds into the die.
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Flanging dies
Flanging dies bend metal along a curved axis. Flanges can be tension or stretch flanges, and compression or shrink flanges. They are created using a flanging die that wipes the metal between a punch and a lower die section. Both tension and compression occur during the flanging process.
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