I was called out a few days ago to look at a tube bending machine.
The machine was PLC controlled and runs with a semi automatic program. The client has a problem bending a large steel pipe and asked if I could help. The machine was second hand with no manual so I had to quickly start from basics. The pressure was set to the highest value and the machine did not quite have the full force needed to complete the bend although it was just possible by switching the control valve off and back on again to achieve a pressure spike.
It would be possible to change the spring in the relief valve (to higher rating) but then the vane pump had a maximum of 140bar and the existing pressure is pretty close. Then there is the electric motor. By increasing the pressure we will need to draw more power and without knowing the flow and the motor Kw I could not calculate what my motor draw. Last of all I should also consider the mechanical strength of the machine. Will it take the extra load without breaking something?
Raising the pressure is a very easy thing to do but not before you have considered all of the implications.
Regards
Bob
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