Press speed vs Tonnage

A

AlaskanHunter

Joined
Nov 23, 2013
Messages
306
I'm starting to collect materials for a forging press and from what I understand, the two key things in a press are speed and pressure. I'm specifically looking at a two stage pump 16 gpm/ 4 gpm and either a 4, 4.5, or 5 inch ram bore. If I'm figuring correctly that will give me 4.9 ips in high and 1.2 ips in low @ 35816 psi with the 4", 3.9 ips in high, 1 ips in low @ 44532 psi with the 4.5", 3.1 ips in high and .8 ips in low @ 54978 psi with the 5"
So, which is more important-speed or power? Or is the compromise of the two better?
 
AlaskanHunter said:
I'm starting to collect materials for a forging press and from what I understand, the two key things in a press are speed and pressure. I'm specifically looking at a two stage pump 16 gpm/ 4 gpm and either a 4, 4.5, or 5 inch ram bore. If I'm figuring correctly that will give me 4.9 ips in high and 1.2 ips in low @ 35816 psi with the 4", 3.9 ips in high, 1 ips in low @ 44532 psi with the 4.5", 3.1 ips in high and .8 ips in low @ 54978 psi with the 5"
So, which is more important-speed or power? Or is the compromise of the two better?
Click to expand...
Oops, that was supposed to read 35816 pounds of force- almost 16 tons, not psi! That would be a scary hydraulic system if it were running at that psi. Same for the other two- just over 22 and just under 27 tons, respectively. I'm only planning on running @ 2800 psi.
 
The ram size only influences tonnage in the pull direction. A 5" bore with 2" ram will pull 24.7 tons at 3000 psi, but will push 29.5 tons.

A 16/4 GPM pump, or .994 and .192 cubic inch displacement pump will, at 3440 RPM:

Move a 5" cylinder at 2.9" inches per second in high flow
Require 4.9 HP to achieve 500 PSI and switch to low flow
Move a 5" cylinder at .56 inches per second in low flow
Require 5.4 HP to achieve 2800 PSI at that speed.
Will make 23 tons "pulling" and 27 tons "pushing."
(Assuming 85% efficiency)

And is essentially what I just built, except I used a 4.5" bore cylinder, so it's a little faster and a little lower tonnage.
 
You must log in or register to reply here.
Back
Top