Sheet Metal Forming: Bending

Sheet metal forming bending definition

Companies typically perform bending on sheet metal using either a brake press or similar machine press. The sheet metal is placed over a die block, at which point a punch presses down onto the sheet metal. Bending doesn’t actually create holes in sheet metal. Rather, it lives up to its namesake by “bending” sheet metal in the shape of the die
  You might also want to know more about Sheet metal forming in Vietnam through:
https://vnoutsourcing.com/en/capabilities/Sheet-Metal-Forming.html