About Hydraulic Presses
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The use of hydraulic presses over the traditional mechanical press has increased dramatically over the last 30 years. Until recent history, the mechanical press was the common machine for production press work. The mechanical press utilizes a rack and pinion as well as a crankshaft to achieve significant tonnage without an external power source. It wasn&#;t until the early s that hydraulic presses became the more popular option.
Hydraulic Presses utilize hydraulic cylinders, single-direction mechanic actuators, to create compressive force. Invented in by Joseph Bramah, hydraulic systems were conceptualized by studying the movement of fluids through early toilets, which were later replaced by toilets created by Bramah.
Hydraulics depend on Pascal's law, which basically states that when an incompressible fluid is given pressure, the pressure is applied evenly in every direction. This law allows the force generated from compressing a fluid to be utilized in moving mechanics like a piston. It was also discovered that using a smaller piston to pressurize the fluid, through which moves a larger piston, generates greater forces than using two equally-sized pistons. This is called a force multiplier and is crucial when creating a hydraulic system.
Needs
Before seeking out the best prices, you should consider the role a hydraulic press will have in your personal shop or business. Writing a full list of tasks you&#;d like a press to accomplish can provide a better scope of the strength, size, type, model, etc. of press you will need. Be sure to understand what a hydraulic press can do; the range of abilities are extensive. Bending, blanking, drawing, forming, molding, punching, and stamping are just some of abilities of hydraulic presses. Not all machines are capable of these actions and should be taken into consideration.
Tonnage
After considering the uses for your press, the next important question to ask is what tonnage will be required for the jobs. If you are switching from a mechanical press to a hydraulic press, the tonnage requirements will not change. Do consider, however, when choosing the right hydraulic press, you only need to know the maximum tonnage you will require for any given job. Opposed to a mechanical press, most hydraulic presses can be tuned down to a lower tonnage depending on the task.
The required tonnage to punch material (or the punching force) varies depending on three factors: perimeter of the punch, shear strength of the material, and material thickness. The tonnage can be calculated with the following equation:
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Shear strength is a measurement of the force needed to produce a sliding failure on the material along a parallel plane to the direction of the force; punching a hole in paper is an example of paper failing in shear. Shear strength is commonly measured in kilonewtons per square millimeter (kN/mm2) or pounds per square inch (PSI). All materials shear fail at different levels of force, so it is important to understand the specifications of the material you are working with. The material specifications also include the thickness of the material being handled.
Though punching is a common use for a hydraulic press, other functions also require specific tonnage in order to be effective. It is encouraged to understand the tonnage requirements for any job you plan to utilize a hydraulic press for.
You know what a hydraulic press is and how it works, but did you know that there are different types that can make your workload easier and more efficient?
A manual press would be best for smaller objects and simple applications. A movable table press would be ideal for large, heavy objects that you cannot lift on your own.
So, how do you know what style will be best for your application? Here we will describe 5 different types of hydraulic presses and why you would need them.
The Movable Table Hydraulic Press
Say you have a widget that is too big and too heavy to place on the bed of a standard H-frame style press safely and efficiently. You can&#;t load it with a fork lift or an overhead hoist, but you need to press a bushing out of it.
Additional resources:
How Does a Glass Etching Machine Work?
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Oh, and these widgets come in different sizes so you need flexibility as far as daylight goes. A movable table press is the answer to this perplexing problem. Whether you need 25 tons is of pressure or up to 200 tons of pressure, movable table presses hit the mark.
Load your part safely onto the table using a forklift, overhead hoist or two strong people, then simply roll the table under the work head and work your magic.
The work head can be raised or lowered to meet your daylight requirements from one size widget to another.
The Movable Frame Hydraulic Press
Ok, here is another scenario. You have a shaft or a steel plate that needs to be straightened (which in itself can be a challenge). Now imagine that shaft you are trying to straighten is 6 feet long and you only have an H-frame press to get the job done.
You are constantly moving the part trying to line up the area you need to apply pressure to. It&#;s nearly impossible to bring the part to the work head and hit your mark every time. What if you could bring the work head to the part instead?
With a movable frame press you can do just that! Load your part safely from any side or down from above, move the frame to the location you need to press, then move the work head to zero in on the precise area you need to contact. From here out it&#;s gravy you get the work done easily and safely.
The Air Operated Hydraulic Press
Is your shop short on power but you have an air hook-up and don&#;t want to manually pump a press? Maybe you need to operate a press in an explosive atmosphere. An air operated hydraulic press will solve your problems.
You will receive the same pressing power as an electric press but without the mess of electrical hook-ups. These presses are offered in 25-200 ton capacities.
Double Acting Hydraulic Press
Many companies purchase a hydraulic press for an application that requires a fixture or die be mounted on the piston. Often times, they make the mistake of getting a single acting press for this type of application.
Unfortunately, a single acting work head has a spring return, and if the die is too heavy, the return may not be full or consistent. This is where a double acting hydraulic press comes in handy.
They offer more lifting power keeping your dies and fixtures where you want them, when you want them there.
The Manual Hydraulic Press
Say you have a submarine and aboard you have a small machine shop. Above and beyond the basic repair tools, you probably need a press. Power is at a premium and floor space is not something you have a lot of. What do you do?
A Dake manual H-frame press will offer an easy solution to your problem. No power is necessary and you won&#;t lose durability or pressing power.
Even if you don&#;t have a submarine, a Dake H-frame press can do hundreds of applications just about anywhere at any time.
For more How Hydraulic Press Worksinformation, please contact us. We will provide professional answers.
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