The primary focus for achieving these permanent shapes is the process of bending, which involves stressing the material past its yield point but below its tensile strength. Bottoming and Coining Unlike air bending, bottoming and coining utilize a process called "bottom-out" to achieve specific, sharp angles with high precision.
Achieving Minimum Radius with Bottoming Bending
In this process, the punch presses the material into the die, but it does not bottom out; the metal bends solely on the force of the punch entering the V-shaped die. The location of this neutral layer, known as the K-factor, is critical for calculating flat patterns and ensuring the final part meets dimensional specifications.
This discipline relies on specific principles of physics and material science to predict how a sheet will react to applied forces. The primary advantage of air bending is its flexibility—it allows for a wide range of angles and shapes using a single set of dies.
Achieving Minimum Radius with Bottoming Bending
In bottoming, the punch forces the material completely into the die, conforming to its shape to minimize the radius of the bend. Modern CAD software often automates these values, but a foundational understanding ensures better designs and troubleshooting.
More About Types of bending in sheet metal
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