EXTRUSIONS are everywhere-in conveyor systems, scaffolding, playground equipment, swimming pools, and furniture. They also are key components in architectural windows and automotive window trim. We are surrounded by bent extrusions and their close cousins, bent rolled formed sections. Managing the flow of an extrusion within the bend zone is at the heart of making a good bend. Die clearance, die material, die hardness, and die surface finish can all align to produce quality bends. The bend radius and the compressive forces within the workpiece are inversely proportional. In other words, as the bend radius decreases, the compressive force increases. This influences bender choice. Large-radius bends generally are well-suited to either a roll bender or a stretch bender. Tight-radius bends often require a rotary draw bender.
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