SShep71
Hot Rolled
- Joined
- Sep 17, 2014
- Location
- San Diego, Ca
Since my Chicago Dreis Krump 131-36 clutch press brake, broke, and almost took of my hand in the process it is getting an UPGRADE. I saw that Baileigh has a 3142, 31" wide 42 ton press brake. A "cute" little item, but with a 22,000 price tag. I like the size, despise the company, hate the price tag. I am going to step the game up and go from a 12 ton mechanical press brake to a 40 ton hydraulic press brake. I am going to have to dig into my stash of 1" plate that I have been hoarding for a whiles now for the new strengthening members. I have the mechanical aspects all worked out, reinforce that, weld this, strengthen that, large pin here, big bolt there, voila! I am in need of my hand being held with regard to the hydraulic system, as I never had to design a hydraulic system from scratch before I naturally have some questions.
I am trying to mimic a Piranha 6' 45ton press brake for ram velocity and such, the Piranha lists a work velocity of 19 IPM and a retract velocity of 165 IPM. I have no idea what type of pump they are running, but it seems as if it is a variable displacement pump in order to get the ram velocities mentioned, 5hp is specified for the motor.
On my monstrosity:
-The upper die will have a travel of just over 4"
-The upper die will be driven by a lever arm with a ratio of 3.68:1, that will give me plenty of safety room to hit the 40ton mark.
-The cylinders are 4x18x1.5" diam rod.
-The motor is a 10HP 3 phase motor 1750 RPM for the power
-I am going to build a baffled tank with about 25-30 gallon capacity with all the proper fluid management built into it.
Now the requested help, the pressure calculations show that I can run 1000psi from the pump in order to achieve the 40 ton target force. The pump I bought is a Eaton/Cessna gear pump but it is only a 0.6 in^3/rev displacement (originally I had planned for a 3x6 cylinder), but the pump is bought already. From what I calculated the max velocity that pump will allow for is 29 IPM at the ram/die. Is this correct?
velocity of the ram x the 3.68 lever arm ratio= velocity of the cylinder (607 IPM)
velocity of the cylinder x specific gravity of the oil x area of the bore (on the push side)= mass volume required (6554 in^3/min)
I am on the right track here? 6554 cubic in per min seems like I made a mistake. If you wish to provide some "oversight" I can provide you with the excell spread sheet with all my calculations and data so far. I appreciate the help, I am in dark waters here.
I am trying to mimic a Piranha 6' 45ton press brake for ram velocity and such, the Piranha lists a work velocity of 19 IPM and a retract velocity of 165 IPM. I have no idea what type of pump they are running, but it seems as if it is a variable displacement pump in order to get the ram velocities mentioned, 5hp is specified for the motor.
On my monstrosity:
-The upper die will have a travel of just over 4"
-The upper die will be driven by a lever arm with a ratio of 3.68:1, that will give me plenty of safety room to hit the 40ton mark.
-The cylinders are 4x18x1.5" diam rod.
-The motor is a 10HP 3 phase motor 1750 RPM for the power
-I am going to build a baffled tank with about 25-30 gallon capacity with all the proper fluid management built into it.
Now the requested help, the pressure calculations show that I can run 1000psi from the pump in order to achieve the 40 ton target force. The pump I bought is a Eaton/Cessna gear pump but it is only a 0.6 in^3/rev displacement (originally I had planned for a 3x6 cylinder), but the pump is bought already. From what I calculated the max velocity that pump will allow for is 29 IPM at the ram/die. Is this correct?
velocity of the ram x the 3.68 lever arm ratio= velocity of the cylinder (607 IPM)
velocity of the cylinder x specific gravity of the oil x area of the bore (on the push side)= mass volume required (6554 in^3/min)
I am on the right track here? 6554 cubic in per min seems like I made a mistake. If you wish to provide some "oversight" I can provide you with the excell spread sheet with all my calculations and data so far. I appreciate the help, I am in dark waters here.