A press brake is used in sheet metal fabrication to bend sheet metal into precise shapes and angles. It plays a crucial role in the automotive, aerospace, home appliance, construction, furniture, medical, electronics and defence industries.
What does the process do?
It operates by placing the metal sheet between two components: the upper punch and the lower die. The punch applies force on the sheet, pressing it into the die to form the desired bend. This process results in the metal deforming plastically, meaning it permanently takes the shape dictated by the tools. The amount of force applied depends on the thickness and length of the metal being bent.
What are the different types of press brakes?
Specialists in sheet metal fabrication use press brakes with various drive sources such as hydraulic, mechanical, electric and pneumatic systems, with hydraulic brakes suited for higher tonnage applications and servo-electric models offering high precision and speed.
How does the bending process work?
It involves a controlled transition from elastic deformation, where the metal springs back, to plastic deformation, where permanent shaping occurs. To achieve accurate bends, operators consider factors like springback, in which the metal partially returns to its original shape, and compensate accordingly, often through overbending or using advanced CNC controls.
The typical bending cycle includes positioning the sheet, pressing the punch down to form the bend, holding it briefly to ensure accuracy and then retracting the punch for the next operation. Press brakes are essential in industries requiring precise, repeatable bends for components such as brackets, enclosures and structural parts.