Pressbrake Tooling: Bending and Punching Guide for Tool Setting

There are several processes that one must go through when bending and punching. Described below are just some of these processes including how you can execute these processes effectively and safely.

1. Air Bending

Air bending refers to the process used to bend sheet metal. This process is preferred to other press brake bending techniques that can be used to achieve the same objective because it requires less energy to effect the bend especially where thick and heavy sheet metal is involved. Further, air bending can be used to achieve diverse and complex angular bends on the sheet metal.

That said, the accuracy of the angular bends has a lot to do with the quality and thickness of the sheet metal used. It is important to note that when using air bending, you should turn the sheet slightly beyond the desired angle of the bend. This is because sheet metal will usually marginally spring back after the sheet is released.

2. Coining

Coining is another bending process used in press brake bending. In this process, the punch’s nose crushes the sheet metal within the bending radius so that the sheet metal loses its elasticity. Thus, unlike air bending, the angle at which the sheet is bent using coining is retained even after the tool is disengaged.

For this reason, coining can thus be used to achieve a more precise angle bend. However, the drawback with this particular process is that you require a high tonnage to realize the bend.

3. Punching and notching for press brake

You can effect a notch or a punch on sheet metal using the special purpose units or the swan neck holder. However, so as not to damage the machine in the process, you should always ensure that the tonnage power to be used while effecting the punch or notch is always less than a third of the total tonnage capacity of the tool. The quality of the punch used is important in realizing accurate and fast results so you should always ensure that the punches are sharpened regularly.

4. Safety while setting press brake tooling

There are various safety procedures that you should adhere to when setting press brake tooling. First, always ensure the machine is turned off before you begin working. Fit the press brake tooling to the length required and slightly tighten the tool’s clamp screws.

Start the motor and adjust the regulator to about 2 tons so as to make certain that there is only enough power to move the beam. Push the treadle downwards and use the bending depth control so that the top dies engages the Vee. Increase the power tonnage from 2 to 5 tons as you hold the foot treadle down and then tighten the tool clamp screws fully and then you are ready to go.


Post time: 04-12-2017