Many people have heard about hydraulic presses. They may have a rough idea about the press using fluid to make work easy. However, they may lack specific information about what makes the hydraulic press so powerful? A hydraulic press is a machine that generates compressive force by using a hydraulic cylinder and fluid. It works by exerting pressure on a small amount of liquid to create large amounts of power.
People relate hydraulic to engineering concepts thinking that it is a too complex thing to understand.
A mere container with fluid and force applied to one side is enough to explain a hydraulic system’s basic working principle. Before buying a press, you may need to understand some facts about it. If you are interested in understanding what makes the hydraulic press so powerful, you are at the right place! The article gives all the simplified information about the hydraulic press, including additional buyer guide information.
To understand what makes a hydraulic press so powerful, let us look at the essential components of a hydraulic press.
The pump accumulator.
The hydraulic press has an accumulator for holding fluid. The accumulator also transfers heat in the system and removes different types of moisture and air stored in the liquid.
The hydraulic pump moves mechanical energy into the system by moving the confined fluid in the resolver. The hydraulic pumps differ slightly in their working mechanism but function under the same principle of transmitting fluid through pressure. Some of the types of hydraulic pumps include the vane pump, piston pump gear pump, etc.
The hydraulic press valves contain a collection of poppets and spools. Valves initiate and stops the system as well as direct the hydraulic fluid flow. You can control valves by either a pneumatic, mechanical, electrical, or hydraulic method.
The distribution valve controls the flow of fluid while the overflow valve ensures the system’s safety by adjusting the pressure limit.
Different types of actuators serve specific functions in the hydraulic press. Actuators convert the generated hydraulic energy to mechanical form for use. The conversion can be in different ways. The first method is by using a hydraulic cylinder to generate a linear motion. The second method involves the generation of a hydraulic rotary motion using a hydraulic motor.
Do you want to understand What makes the hydraulic press so powerful? Think in terms of energy
The other easy way of understanding what makes the hydraulic press so powerful is by visualizing the concept of energy. Like the physics principle states that you can not create or destroy energy, presses follow the same law.
The hydraulic press system has fluids in both narrow and wide pipes that transmit energy. The thinner part usually has a piston, while the wider side is attached to the load. The amount of force experienced at the wider end on the load is proportional to the force you apply at the pistol times the distance you move. For instance, if the force exerted at the wider end is twice the force supplied on the narrow side, the load will move half the distance moved by the piston. It is because the pressure applied to the pistol is transmitted through the hydraulic pipes.
What makes the hydraulic press so powerful? Think about the type of hydraulic fluid used
Most people think that the hydraulic press machine uses water. This may be right to some extent, but some other fluids transmit energy more efficiently than water. The fluids also lubricate and self-clean the hydraulic system. The best hydraulic media should have low compressibility capacity, lubricate, anti-rust easy to seal, and suitable performance. Some of the fluids used in power transmission include the following.
Some hydraulic machines use water-based fluid in their hydraulic pipes to transmit power. This type of fluid is fire-resistant. However, it does not offer lubrication and can evaporate under high temperatures.
Synthetic fluids are human-made hydraulic fluids that are fire-resistant, offer lubrication to the system, and are very efficient in high pressure and temperature hydraulic presses. Compared to other hydraulic fluids, they are expensive.
Petroleum-based is the most common hydraulic fluid used in hydraulic machines. They are customized to the specific system by the addition of other additives. The fluid may contain anti-wear agents, extreme pressure agents, and oxidation agents that improve efficiency.
How to select an excellent Hydraulic press machine/buyers guide?
Apart from understanding what makes the hydraulic press so powerful, you may also need to know how to select the best machine.
Before buying a hydraulic press machine, consider the following;
Before seeking to understand the best price, consider the type of work you need to accomplish with your hydraulic press machine. Having a complete list of the tasks you need to accomplish will give you a scope of the size, strength, type, and model you need to buy. Be sure of what the hydraulic press machine can do. The press ability may range from bending, drawling, forming, punching, modeling, stamping, blanking, stamping, etc. Not all hydraulic press machines can perform all these functions. Before you purchase one, check on the following ;
When shifting from a mechanical to a hydraulic press, the tonnage will not change. However, when buying the hydraulic press, you need to consider the maximum amount of tonnage you need for your work. Unlike the mechanical press, the hydraulic press allows adjustment of the tonnage to a lower level depending on the task.
The tonnage requirements for punching a material depend on the perimeter of the punch, thickness, and sheer length. You can calculate the tonnage requirement by multiplying perimeter (mm) by shear strength (kN/mm2 and then diving it with 9.81
Sheerness strength is the force you need to produce a sliding failure on a material along a parallel plane to the force direction. Measurement of shear strength is in kN/mm2 (kilonewtons per square millimeter). All the material shear fails at a specific level of force. You need, therefore, to understand the type of material you are working with.
The thickness of the material you need to handle is another important specification you need to understand. Before buying a hydraulic press, know the type of material and work you intend to do.
Tooling and Accessories
Most of the modern presses are equipped with several features such as automatic cycling, dwell timer, light curtain, and distance reversal limit switches. However, some hydraulic presses present additional features that improve the efficiency and productivity of the machine. Though buying such presses may be slightly expensive, but saves your working time and money in the long run.
When you are buying the press for the first time or making a replacement, ensure it is compatible with your tooling style.
There are several types of hydraulic press designed for specific tasks though others may be multipurpose. The two major types are H-frame and C-frame press.
The C-frame type is also called gap frame or open frame. It is a space-efficient machine with three-sided access. Due to its ability to take up small space and perform a large amount of work, it is mainly applicable in manufacturing operations.
H-frame presses are also called the 4 column press or 4 presses. They have four posts that direct the tooling and the pressing plate. The symmetry of the press gives it a better accuracy and power compared to the C- frame type. Unlike the C-frame press, this type can evenly distribute the pressure, making it the best option for a shop that needs a robust press.
I hope you have gathered enough information about what makes the hydraulic press so powerful. The design and fluid used in the hydraulic system make it perform with a lot of power. Though their efficiency will differ with models, finding the best you need for your task depends on your individual preference.
You must have a deeper understanding of the press you use in your shop. Before rushing to buy one, examine your needs. Understand the specific type of press that will work best for your task, including its compatibility with the tools and accessories.
Feature Image Source: Safety Lifting Gear