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Home » Products » Hydraulic Presses

Hydraulic Presses


Salient Features

Advantages of Hydraulic Presses Over Mechanical Presses
Characteristics Hydraulic Presses Mechanical Presses
Force Relatively constant (does not depend upon slide position) Variable (depends upon slide position)
Stroke Length Capable of long stroke 100" (2540 mm) or more Very limited
Capacity 50,000 tones or more About 600 tons maximum practical
Wear & Tear Very Less Very High
Maintenance Cost Very Less Very High
Rejection Chemicals Very Few Very High
Final Product Quality Best Good


Fabricated ultrasonically tested steel construction of frame :
Frame is fabricated from prime steel plates of proper thickness for greater strength & rigidity. All frame is designed on latest softwares to resist any deflection & capable enough to withstand high pressure & vibration damping capabilities.

Accurate slide Guiding Arrangement :
Different kind of guiding arrangement are provided to suit the application of the press long guiding length & suitable guide with centralized lubrication system is provided in the presses. Please refer following pictures.


Bottom Cushioning Arrangement :
The function of the draw cushion is to hold the blank during deep drawing operations. The cushion thus prevents the formation of wrinkles & as a resuet of the ejection function, raises the parts to the transport level or ejection level during the return motion of the slide. The cushion is designed for about 30% of the main ram tonnage when in cushion mode.

Stroke Limiters & Damping device :
Mechanical stoppers are provided as a safety feature to limit the maximum stroke of the main ram after pressing, to protect the tool from damage.


Most Reliable Hydraulic Drive System :
'SANTEC' hydraulic system is most reliable & the backbone of hydraulic presses. It involves a compact manifold Block to avoid piping thus less chance of any leakages in the system so pressure will remain constant throughout the cycle. All the valves are internationally reputed make, so reliability is more. High quality indigenously made precision hydraulic cylinders with low friction PTFE seals with 60%. Bronze guide tapes ensure operation & long life of the press.

Control System :
The press controls are designed into a panel which is mounted at type level on the press. A TFT Flat panel with touch screen & key pad of world renowned "Allen-Bradley" is provided so graphical display of control information, indication of activation status of slide, cushioning & ejection operations are possible. The blank holder, main slide & cushion stroke are infinitely variable. Slide reversal is either by limit switch or pressure switch sensing. The blank holder, main slide & cushion pressures are individually controllable between 10-100% of tonnage throughout the stroke. Individual pressure control of the various blank holder cylinders or multi point cushion can be provided for drawing of complicated & asymmetrical pasts.


Operator's Safety Systems :
  • Two hand push buttons operation facility to engage operators hand.
  • Photo-electric safety guards & hydraulic / mechanical operated moving protected guards may be provided at the front & back side.
  • Hydraulic locking of the main slide & Blank holder at top dead centre (TDC) to ensure safety when operator is working in the tooling area or under the moving ram.
  • Electronic safety inter locking arrangement to ensure proper sequencing of operations.
Accuratel Slide Parallelism arrangement :
A slide position sensor to detect deviation & the servo valve to increase pressure on underside of the piston are provided & at the same time the pressure on other connecting pipe is reduced. The maximum deviation measured at the parallel control cylinders is between 0.6 & 0.8 mm during drawing, bending, smc moulding & other forming operations.


Lubrication:
Ram slides / guides/ guide bushes are lubricated from a centralised lubrication arrangement.

Moving platen:
It is a fabricated, heavy duty, tested welded plate construction for highest stiffness under heavy loads. The whole platen is stress-relieved after welding. 'T' slots provided in the platen are as per DIN standards. Hydraulic or mechanical ejector pins to operate from inside the ram is also provided as optional on request or depending on the application.


Die transfer rails
or bolster sliding arrangement is also provided as optional in front side of the press for heavy tools applications.

Other features are:
  1. These presses provide fast approach slow pressing & fast return speeds. The change in speed can be manually preset to take place at any point of the stroke with the help of limit switches / proximity switches or Linear encoders / LVDT
  2. The frame is fabricated by ultrasonically tested quality profiles & plates of suitable thickness to with stand the load & longer life of the press. The frames are stress-relieved by ultrasonic virbrators.
  3. Maximum frame rigidity is achieved through computer aided frame design & finite element analysis.
  4. Extra long, precision machined & hardened guides to face slides offer exceptional accuracy & alignment which further reduced to wear.
  5. In blanking or punching, hydraulic presses a damping system can be fitted. This effectively reduces breakthrough noise & tool wear normally generated by such operations.
  6. The low noise hydraulic power pack unit is designed as per international practices & assembled with internationally reputed make components. The presses are designed as per ISI guidelines, hence standard seals, bushes are used.
  7. "Programmable logical controls" (PLC) is provided in our presses of international standard make i.e. OMRON /Siemens, offering maximum production flexibility & Full compatibility with international standards.
  8. Precise machining of the structural members is done after normalising to get the required accuracies like parallelism between platen & bed & right angularity between bed & the moving platen.



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