How to Test Hydraulic Presses

Hydraulic presses can be invaluable tools in metal forming and bending applications, offering quieter operations than other metalworking machines as well as precision control.

Have you seen one in action on YouTube videos where a Finnish couple presses household items until they break? While these demonstrations can be entertaining to watch, programmable hydraulic test presses are intended for more serious applications.

Pressure

Hydraulic presses are powerful machines capable of exerting enormous mechanical force on metal to deform or shape it, used for various purposes in manufacturing industries from welding quality control, destructive testing and nick break tests to analyzing joint fusion of welds as well as measuring base metal performance in bending tests.

Material testing usually entails breaking stuff apart and measuring how much force is necessary to do so. Mechanical engineers tend to focus on testing tensile strength as an important strength property, which can best be measured using a large hydraulic press.

Hydraulic presses can make work more efficient by offering time and effort savings for operators. However, issues can arise with these machines such as leakage around the ram, oil seeping through piston oil seal leakage and press not reaching its full tonnage rating. All these issues can easily be remedied through proper maintenance steps.

Force

Hydraulic presses exert immense amounts of force and are typically measured in pounds per square inch (psi) or tons. Their force output can be calculated by multiplying their pressure reading with their piston diameter and then dividing by 2,000 to get their estimated capacity in pounds or tons produced.

Many laboratories utilize hydraulic presses to prepare samples for analysis by compressing them into pellets or films, such as those commonly used in infrared spectroscopy - for instance KBr pellets can be made by pressing milled or finely ground samples into a press pellet die.

For these applications, a manometer with either pounds or tons scale is often placed on the press to monitor force applied by its master cylinder. FUTEK's USB solution may also provide real-time feedback during press verification testing.

Speed

Hydraulic presses use liquid pressure to convert force into shape, making them one of the most versatile material shaping tools available. They can perform tasks such as coining, crimping, bending and punching for numerous coining, crimping, bending and punching applications in repair shops as well as production lines. These versatile machines make an indispensable addition to any production or repair shop's toolbox.

Hydraulic presses consist of two cylinders with pistons that match, connected by hydraulic pipes which transfer fluid pressure. They feature a slide block to control ram direction and an inbuilt motive seal to prevent leakage.

Instead of mechanical presses, hydraulic presses can exert maximum force throughout their stroke. As soon as a ram moves further from bottom dead center (BDC), however, available force decreases rapidly due to de-rated tonnage; this effect can affect both conventional mechanical presses and servo-mechanical presses due to either setting program bend point settings incorrectly or an off-center load exceeding limits; additionally the ram may stop and reverse before reaching full tonnage or completing its bend.

Temperature

Hydraulic presses are used in product development and quality control during production to test machinery performance and efficiency. Laboratory presses are smaller versions of full-sized hydraulic presses used during production - providing important data and performance guidelines.

Hydraulic presses can serve a multitude of functions, from testing the tensile strength of samples to crushing pharmaceutical materials for further analysis with technologies like FTIR spectroscopy. Because of this versatility, it's crucial that your hydraulic press operates at its optimal performance; performing regular preventive maintenance inspections will save time, money, and headaches by detecting problems early. A few simple maintenance steps should help your hydraulic press run smoothly for years. Check for signs that it needs attention such as: