folders are machines designed especially for sheet metal folding; These machines carry out several types of folding: deep folding and air bending, taking into account the thickness of the sheet. They are classified depending on the driving force with which the folding occurs as well as the various forms or actions of the pressing forces.

The structure of these machines is made up of several elements, either mechanical or hydraulic, the most important being the actuation parts, some of these machines allow controlling the penetration of the punch.

It is a machine tool designed for sheet metal bending; they are normally used for cold work; These are generally hydraulic and mechanical.

Press brakes are classified as:

The main characteristics of all the basic elements such as the sides, tamper and jaw "Clamp (mechanism)") are designed in a cast tubular profile so they offer great resistance to bending.

The minimum internal radii in the maximum thicknesses are 1.5 times the thickness of the sheet. The minimum folding edges range between 6 or 7 times its thickness.

All main organs rotate on high-quality phosphor bronze bearings and the spindles on ball bearings, giving it ease of maneuvering without great effort. The three main elements of the folder are movable, allowing the most varied profiles to be obtained.