How to Choose Hydraulic press types?

Author: Polly

Jul. 29, 2024

Selecting a Hydraulic Press

 

Link to tpypress


Selecting a Hydraulic Press

  • Introduction
  • Hydraulic Presses - Fast, Reliable, Productive, and Flexible
  • 10 Advantages of Hydraulic Presses
  • Glossary
  • Formulas and Data
  • Selecting a Hydraulic Press
  • Hydraulic Press Limitations

  1. Tonnage. Is the tonnage required to do a job the same for a hydraulic press as it is for a mechanical press? The answer is yes. There is no real difference. The same formulae are used to determine tonnage. The tooling is usually interchangeable. There may be certain applications such as deep drawing where the full power stroke characteristic of a hydraulic press reduces the tonnage, but there are no known instances where using a hydraulic press requires more tonnage.

    Selecting press tonnage in the typical press room is often little more than guesswork. If, for example, a job is successful on a 100-ton mechanical press, it tends to stay there for the life of that job. The job may never have been tried at 75 tons or at 50 tons.

    With a hydraulic press, however, you can adjust tonnage quickly and easily, tuning the press to precisely the right tonnage for each specific job.

  2. The action of the machine. Even though the tonnage question might be settled, the question of the effect of the stroke on the work is often asked. Is it the same as with a mechanical press?

    The answer, again, is yes in most cases. There are some specific limitations. Drop hammers and some mechanical presses seem to do a better job on soft jewelry pieces and impact jobs. The coining action seems sharper if the impact is there.

    In deep drawing, however, the full power stroke of a hydraulic press produces significantly better results.

    Otherwise there are very few examples where the application of 100 tons of hydraulic force produces any significant difference in the character of the part given the same tooling.

    Shear in the dies will reduce blanking tonnage for hydraulic presses in the same way it does for mechanical presses.

  3. Type of press selection. Open-gap presses provide easy access from three sides. 4-column presses insure even pressure distribution. Straight-side presses offer the rigidity required for off-center loading in progressive die applications.

    The more critical the work and the more demanding the tolerances, the greater the reserve tonnage capacity should be.

  4. Accessories. Most hydraulic press builders offer a wide array of accessories. These commonly include:
    • Distance reversal limit switches
    • Pressure reversal hydraulic switches
    • Automatic (continuous) cycling
    • Dwell timers
    • Sliding bolsters and rotary index tables
    • Die cushions
    • Ejection cylinders or knockouts
    • Electronic light curtains and other devices
    • Touch screen controls
    • Servo system feedback for precise, consistent, repeatable stroke control
  5. Quality. The industry offers various levels of quality. There are light-duty presses that are capable of "spanking" the work momentarily and reversing, and there are heavy-duty machines designed for general purpose metalworking applications.

    Here are just a few construction points that will provide a basis for comparison of one machine with another:

    1. Frame. Look at frame construction-rigidity, bolster thickness, dimensional capacity, and other factors.
    2. Cylinder. What diameter is it? How is it constructed? Who makes it? How serviceable is it?
    3. Maximum system pressure. At what psi does the press develop full tonnage? The most common range for industrial presses is to psi.
    4. Horsepower. The duration, length, and speed of the pressing stroke determines the horsepower required. Compare horsepower ratings.
    5. Speed. See page 5 to determine the speed of a hydraulic press.

Next Section

 

5 Types of Hydraulic Presses and Why You Need Them

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.

 

Want more information on Hydraulic press types? Feel free to contact us.

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.

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.  

Are you interested in learning more about How Hydraulic Press Works? Contact us today to secure an expert consultation!

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