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CNC Brake Press

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Useful tips to buy Brake Press



When we are talking about bending sheets and plates, we have to refer to some machines such as Press Brake. So, Press Brakes are machines which bend, curve, fold and shape sheets and plates. There is always a question: why do we call it “Press Brake”? NOT sheet /plate bending machine? Very early all machines mostly had some levels to stop /start the machines. The levels, in presses, kept the sheets tight to bend, some people called it brake to stop plate or sheet tight. This is why it is called Press Brake.

When you want to purchase a Brake Press for your factory, some points should be considered. The points including technical affairs and commercial affairs. At first we review technical points and then we keep you informed of commercial affairs:

Material (sheet / plate material)

One of the most important critical points to purchase Brake press is “material “ metallurgy including steel , stainless steel , Aluminum , composite and dimensions of material including thinness, width and length.

Tonnage or Capacity

Tonnage refers to the bending force. it means the thicker the material the more tonnage required. Harder metals such as ST 60 require more tonnage compared to St 37.

Calculation for Tonnage in Brake Press

The main formula to calculate
the bending force: F = (1,42 x TS x S2 x L)/1000 x V
internal radius: R = (5 x V) / 32
It would be easy to use tonnage calculator in the following website: http://www.precitools-it.com/materials/press-brake-calculator.htm

Accuracy in Brake Presses

Accuracy in Brake presses relate to deflection .Deflection is the amount of deformation of the press brake rams and bed when Press Brake machines are bending sheets or plates. It goes without saying longer tolls, greater deflection in the beds and rams or shorter blade, less deflection. Some Brake Press manufacturers believe that 8.5 Kg/mm2 is stress standard.

Tolerance in Brake Presses

One of main parameters distinguishes professional Brake Press from conventional Brake Press machines is tolerance in constancy. For Brake Press machines tolerance is 0. 5 mm and it would be considered normal but some customers may not need to have this accuracy in their production line.

Time of Changing tools

Press Brake Machines should be designed in a way to minimize time of changing tools. So, one of main parameters showing perfect design in Brake Press machines is time of setup. Some Brake Presses are equipped with systems of quick-change considered the best to save the time. One of professional companies in tools of brake press Machine is Rolleri Company. https://www.rolleriusa.com/

Main components of the press brake

Mechanical parts, Electrical parts, Hydraulic part, NC/CNC controller.
Frame, Top Beam, Bottom Beam, Back Gauge, Driving System including Hydraulic, Mechanical, mechanical, electrical devices and tooling.

Lubrication System

One of main parameters in Brake Press is lubrication system relating to the grease fittings, back gage screws and sideways on the rams. When you want to purchase a brake press, ask supplier to provide you with the drawing of lubrication system. Check the drawing to see whether lubrication system has been designed well.

Back gage, Ram and bed

The back gages in Press Brakes are used to ensure your formed flange is the correct length. Make sure the back gages homes and moves smoothly and freely. The rams support the forming punch and move up and down. Unlike shearing Machines, press brake machines must have accurate movements and repeatable ram to within 0.001”. The beds are considered as working surface of Press Brakes and support the die holder and dies. The beds of Brake press should not have any dents and gouges.