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Hydraulical Presses

Hydraulic Presses

Hydraulic presses are operated by large pistons driven by high-pressure hydraulic or hydro-pneumatic systems. They are slow moving compared with mechanical and servo presses, and squeeze rather than impact the workpiece. In operation, hydraulic pressure is applied to the top of the piston, moving the ram downward. When the stroke is complete, pressure is applied to the opposite side of the piston to raise the ram.

Speeds and pressures can be closely controlled. In many presses, circuits provide for a compensation control or sequential control, e.g. rapid advance, followed by sequences with two or more pressing speeds. The press can also be regulated to dwell at the bottom of the stroke for a predetermined time, raised at a slow release speed, and accelerated until it reaches original position. When needed, hydraulic press speed can be increased considerably. In many cases, hydraulic presses used for open and some closed die forging presses use microprocessors or computers to control the press operation, for parameters such as ram speeds and positions.

Hydraulic presses are rated according to the maximum force they develop. Presses in use for impression currently range up to 120,000 tons.

Hydraulic Press Types and Applications:

  • Two Post Presses
  • Four Post Presses
  • Bending Presses
  • Blanking Presses
  • C-Frame Presses
  • Custom Presses
  • Deep Draw Presses
  • Forging Presses
  • Extrusion Presses
  • Heat Tempering Presses
  • Hot Platen Presses
  • Laminating and Multi-Opening Presses
  • Multi-Axis Presses
  • Nick and Break Presses
  • Notching Presses
  • Pressure Welding Presses
  • Punch Presses
  • Blanking Presses
  • Stamping Presses
  • Trim Presses

Press function

Application of Hydraulic presses

Bending Press – bends or straightens material.

Blanking Press – punches a piece of material sized appropriately for the finished product or follow on processing

Compression Molding Press – applies pressure to a material or combination of materials to bond and/or develop desired characteristics and provide shape

Deep Drawing Press – fairly radical process of forming a metal blank into a cup like shape with  a punch pushing the material into a die

Extrusion Press – presses material through a die to form the desired shape

Forging Press – shaping hot or cold metal by compressive forces with an open or closed die configuration

Heat Tempering Press – uses heat and pressure to achieve desired material characteristics

Laminating Press – used pressure with or without binders to adhere two or more layers together

Nick and Break Press – notches the material on one side then applies force from the main cylinder in the opposite direction to snap or break material

Notching Press – removes a portion of material by punching a hole or holes on an outside or inside edge

Punch Press – punches a hole or holes into a part

Stamping Press – a single or multiple step process of forming a blank to its final shape

Stretch Forming – places tension on material past its yield point, and then forms it to the final shape with key properties being minimal stress build-up or spring back

Trim Press - removes excess materials from and outside or inside edge or part