It is difficult to bend thick steel plates to a small radius. There are various factors to take into account, including the material’s chemical makeup, thickness, surface, and edge conditions. When a force is applied to a plate, which results in deformation along the bending axis and forces the plate to bend at the required angle, the process is known as plate bending, sometimes known as plate rolling. The material is under tension at the time of the bend, expanding on the exterior surface and contracting, or shrinking, on the inside.
The material’s residual stress will cause the plate to rebound after the bending force is released. The plate must be bent to a larger angle than necessary in order to account for the spring-back. An expert operator can speed up material construction with fewer attempts by calculating the amount of spring back to be anticipated depending on a number of variables. Usually, a press brake is used for plate bending.
The upper tool, sometimes known as “the punch,” and the lower tool, often known as “the die,” are both parts of a press brake. The plate that needs to be bent must be placed over the die and kept there while the punch is lowered over it, exerting a force that bends the plate. The depth to which the punch drives the plate into the die determines the bend angle. The most popular type of plate bending is known as V-bending, in which V-shaped punch and die tools are utilized.
“Air bending” occurs when the material is not pushed all the way to the bottom of the die cavity, leaving room underneath; “bottoming” occurs when the material is pushed all the way to the bottom of the die cavity. Because spring back occurs less frequently throughout the bottoming process, the bent angle can be controlled more precisely. When using a press brake to bend a plate, it’s important to keep in mind that the minimum bend radius will need to be larger the thicker and harder the plate is.
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