What is the Difference Between a Hydraulic Press and a Mechanical Press Brake?

If you're shopping for a press brake for your metal fabrication shop, the difference between hydraulic and mechanical presses may be confusing. Though they are essential tools of the trade, their use and function is often misunderstood by both professionals and non-specialists alike.

Hydraulic Press

Hydraulic presses are power presses that utilize synchronized hydraulic cylinders to move the ram. These presses offer full tonnage throughout every stroke and even reverse it at any time, giving them more customization and flexibility than their mechanical counterparts.

Hydraulic presses operate under Pascal's law, which states that pressure within a non-deformable container will exert the same intensity everywhere.

Hydraulic presses offer more force to sheet metal than mechanical press brakes, leading to higher material densities. This provides hydraulic presses with greater bending and cutting capacity in various applications.

A hydraulic press also has fewer moving parts than its mechanical counterpart, meaning less maintenance and repair work over its lifespan. Furthermore, these presses utilize hydraulic fluid as a lubricant and are vibration-free - making them safer options for manufacturing operations.

Mechanical Press

A hydraulic press utilizes a liquid to apply pressure to shape or deform metals. It mainly consists of a piston, hollow cylinder and power unit/pump which generates mechanical force on the ram by increasing fluid pressure inside the cylinder.

Hydraulic presses boast several advantages over mechanical press brakes, such as their versatility and customization options. Plus, hydraulic presses provide full tonnage throughout the entire stroke.

In a mechanical press, the motor is connected to the flywheel through a countershaft and to the crankshaft via gears or clutch. This produces force which drives the ram onto your workpiece.

The mechanical press is a versatile machine capable of performing numerous metal forming operations, such as stamping, bending, punching and die-cutting.

Tooling Systems

The tooling systems utilized in a hydraulic press can vary based on the model. These may include punches and dies designed for specific metal types or bending angles.

These systems are engineered to produce bends that are precise and efficient, as well as generate graphical representations of the final product that guide operators throughout the bending process.

They come equipped with a range of controls and features designed to enhance productivity. These can range from basic tools like dwell timers, up to more complex options like distance reversal limit switches and light curtains.

Selecting the ideal tooling system for your hydraulic press is critical to ensure its precision and efficiency. Make sure it has all of the appropriate punches and dies tailored towards your business, as well as the flexibility to adapt in the future if needs change.

Maintenance

Maintaining your press with routine maintenance extends its useful life, minimizes downtime and saves on repair bills. Crafting a preventive maintenance checklist tailored for your press and shop helps to identify minor issues before they turn into major expenses.

One of the most critical maintenance tasks is testing hydraulic oil. Dirty or contaminated oil can lead to unexpected downtime, component damage and system failure if left unchecked.

Hydraulic presses require their oil temperature to stay close to 120 degrees Fahrenheit. This can be accomplished through either air or water coolers, ensuring that the oil remains at an ideal level for proper operation of the machine.

Another essential maintenance task is to inspect the ram and light curtains for moisture. Make sure the ram is moist but not dripping, then break the beam as it comes down to stop any pressing of air bubbles.