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If you will use the press as a process machine knocking out parts, it needs to move fast.Ĭonsider this a press is not a forging hammer and it will not do what a hammer can do. If you want to use the press for pattern welding, the ram moves less than an inch each time. In some cases ram speed matters and in some it doesn’t. Nowhere have you said what you intend to use the press for. The problem is that unless you have found a great place to scrounge it is typically cheaper and easier to set up a two stage gear pump.hope this helps.
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With the proper sized accumulator you should be able to complete numerous forging operations and have the system recover between forging cycles. The Accumulator should store enough fluid under opperating pressure to allow me to move the ram extremely fast when it is not under load. With this set up I am pushing a 10.25"diameter 18"stroke main cylinder, and a 5.5"diameter 22" stroke fast acting cylinder. I am using a 15 GPM variable displacement pump and an 18 gallon accumulator. Or you can store massive amounts of fluid under pressure (by using an accumulator). But with a piston pump a system can be charged to 3000 psi and have this pressure immediatly available. Because of this, you have to wait for a gear pump to build pressure (1-2 seconds). In a gear type pump, fluid pressure can not be stored easily due to the fact that the pump must constantly move fluid or they will over heat the fluid and stall the motor driving the pump, therefore most gear pumps idle at about 50 PSI while constantly recycling fluid from, and back to the resivoir. The one cool thing about variable displacement piston pumps is that they are capable of moving from near 0 GPM up to there maximum rated output, therefore they are capable of building and *holding* pressures of up to 3000 PSI. Your pump moving 5 GPM maximum will move a small ram at a set speed fast enough for forging, but the problem is that you will end up spending a lot of time waiting for the ram to cycle. In the second stage the average pump will only typically move around 5 GPM at 2000-3000 PSI depending on what the relief valve is set to. When the dies hit the workpiece the pump shifts to the second stage. (4 to 6 inch diameter cylinder developing 24 to 40 tons with 1+ inches per second no load speed). This stage supplies the volume that a moderate sized cylinder capable of providing sufficient forging force needs to move rapidly until the dies contact the workpiece. In this setup the first stage supplies low pressure high volume (15 or so GPM 500 or less PSI). In most typical home made forging presses a two stage gear pump is used. The main issue that your facing is ram speed.
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