Manual VS Auto Hydraulic Press

A hydraulic press is a machine used to exert a compressive force upon an object based on the principle of Pascal&#;s law. Pascal&#;s law states that when a confined fluid has pressure applied, the entire liquid is affected by the change in pressure. A hydraulic press is commonly used in sample preparation, whereby the hydraulic cylinder is used to &#;press&#; the sample into a thin film or pellet. They are available in both automatic and manual machines. This article will compare the automatic and manual hydraulic press options and the available range from XRF Scientific.

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What is a Hydraulic Press?

Using the static pressure of a liquid, a hydraulic press can crush a range of materials such as plastics, metals, wood, and more. The main components of a hydraulic press include the mainframe, two pistons, two hydraulic pipes, cylinders, and a base plate. It is important to note that some designs will vary, and the hydraulic pistons can be operated pneumatically, manually, or electronically depending on the application and required force.

Why do we Have Manual and Automatic Hydraulic Presses?

Manual and automatic hydraulic presses are key laboratory instruments scientists use to prepare samples for XRF analysis, and each type of equipment has its advantages. This is because some critical applications will require large amounts of force, which has led to the development of automatic hydraulic presses. In contrast, manual presses remain in use for low-force applications.

Automatic

Automatic hydraulic presses are sometimes referred to as pneumatic press, which utilizes electricity to open and close the relief valve and force the piston to move. Although the mechanisms are the same as in a manual press, an automatic hydraulic press can improve efficiency and be controlled to provide highly accurate and repeatable results.

Manual

A manual press is more suitable for low-force, infrequent applications because it requires a lot of physical effort. There are a few drawbacks to using a manual hydraulic pump; for example, a manual pump can become a time-consuming and labor-intensive piece of equipment to use for systematic and repeatable processes. Additionally, the amount of pressure applied can vary each time, as this is dependent on the operator instead of a pre-programmed, automatic movement. However, for less frequent applications that do not require repeatability factors, a manual press is a cost-effective option that makes low-force applications efficient and easy.

XRF Scientific Hydraulic Press

XRF Scientific supplies various pressing equipment, including automatic and manual hydraulic presses, that are ideal for XRF analysis sample preparation. 

Automatic Hydraulic Press

The automatic presses are power-assisted, equipped with a programmable microprocessor, and ideal for a wide range of pressing applications. They are fully CE-marked and designed with ease of use in mind. The automatic press is available for four load capabilities: 8, 15, 25, and 40 tons, and key features include:

• End-of-cycle alarms

• Simple operation

• Touch screen control via color, LCD screen

• Six user cycles with up to 10 segments each

Manual Hydraulic Press

XRF Scientific supplies two manual presses &#; the xrPress MT25 and the xrPress MT25 (which contains a digital display). These manual hydraulic presses are suitable for preparing powder samples for analysis as they are compact benchtop machines and are easy to use. Their key features include the following:

• Accurate pressure gauge

• Adjustable upper bolster

• Pressure release valve

• Vacuum ports

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Hydraulic press is a machine that uses hydrostatic pressure to process metal, plastic, rubber, wood, powder and other products. It is often used in pressing processes and press forming processes, such as: forging, stamping, cold extrusion, straightening, bending, flanging, sheet deep drawing, powder metallurgy, pressing and so on. So who is better than a hydraulic press or a mechanical press? Let's compare the difference between the two:

The hydraulic press is a universal press with an exquisite structure. It has a wide range of uses and high production efficiency. The hydraulic press is relatively stable in loading. It can be widely used in cutting, punching, blanking, bending, deep drawing, shaping, riveting and forming. By applying strong pressure to the metal blank, the metal is plastically deformed and fractured to be processed into parts. The mechanical press has greater impact and is more suitable for blanking, cutting and other separation processes.

The hydraulic press is the pressurized liquid produced by the hydraulic pump to transmit power through the hydraulic actuator of the control circuit. The liquid meson has water, emulsion, and hydraulic oil. It is characterized by high working pressure, stable operation, free control of the working stroke, large adjustment range, large working space, moderate working efficiency, and can complete most of the work of mechanical presses, and has a wide range of applications. The configuration of hydraulic press is more complicated. A slightly larger press is generally equipped with an independent pump station, the control part and circuit are more complicated, and the cost is relatively high.

Mechanical press machines are divided into two types: crank type (punch) and screw type (friction press, cool press). The crank sahft type press transfers force by the crankshaft, and it is characterized by fast running speed, high working efficiency, fixed working stroke and non-adjustable working stroke, and overload operation is strictly prohibited. Generally used for blanking, punching, stretch forming, etc.

The friction press uses the wheel to drive the friction wheel to transmit force by inertial rotation of the screw. The characteristic is that it is not restricted in the effective working range of the screw, the transmission pressure is large, and the work efficiency is moderate. Operation is not easy to control. Generally used for material correction; simple molding; die-casting cavity molding, etc. 

The cool press is mainly used for stretching and forming work. It relies on the screw to directly transmit force. 

Mechanical press features 1) fast operation, high efficiency, low cost, relatively simple control part, easy to maintain, 2) small working table, in order to increase its transmission power is generally equipped with a large counterweight wheel (flywheel), when running The noise is large and the vibration is large.

Other differences:

1. The mechanical press is fast, but not as powerful as the hydraulic press. The hydraulic pressure is high but the speed is slow.

2. Compared with mechanical transmission, hydraulic transmission has a large power/mass ratio, which is convenient for stepless speed regulation and overload protection, flexible and convenient layout, and other technical advantages

3. From the perspective of molds, hydraulic presses are suitable for large, complex and precise automotive sheet metal parts, especially with the "stretching" function. Suitable for large covering parts of automobiles, door parts, etc. Compared with the mechanical press, its characteristics are indeed compact, and the product structure and size stability are better. Maintenance is more convenient than mechanical presses, because of the standardization of hydraulic parts and the maturity of the theory is very high. For example, to find faults, you can find the wings from a hydraulic schematic diagram. Just insist on using genuine hydraulic oil. The efficiency issue is two issues, which are incomparable.

4. Mechanical presses generally rely on impulse, and the pressure stroke is generally about 5 mm. The hydraulic machine has endurance, and the pressure stroke is the same as the cylinder stroke.

5. The mechanical efficiency is high, the speed is fast, the pressure generated is small, and the overload is easy to cause accidents. Generally thin parts. The hydraulic press is the opposite.

6. The mechanical press has high efficiency, but the vibration and noise are large; the hydraulic press solves the problem of reducing vibration and noise, but the efficiency is low.

7. The mechanical force is usually smaller. Some of the machinery is inertial speed and impulse; the hydraulic press is pressurized by the pump.

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