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Compression Molding Presses


Salient Features of Upstroking Type Compression Moulding Presses

  • The low noise hydraulic power pack unit is designed as per international practices & assembled with internationally accepted make valves & other components. The presses are designed as per ISI guidelines, hence standard seals in heavy duty cylinders, bronze- bushes with lubrication arrangement are used.
  • The precisely honed carbon steel seamless tubes are assembled with hardchrome plated piston rod, EN-9 & international quality sealing elements, imported from korea & Japan.
  • Manifold block mounted valves minimising piping, hence no leakage & easy replacement & maintenance.
  • With the help of PLC no. of breathings, breathing duration even in milli-seconds, curing time, temp. of platens, temp. variation range, desired pressure etc. may be programmed in the PLC.
  • During curing period, the electric motor stop & if pressure drops below certain value, it automatically starts & maintain the pressure hence less strain to the hydraulic system, saves electricity, less noise, pollution, improves product quality
  • Soft opening of moulds is provided just after the curing period for the safety of the moulded parts
  • Ultrasonically tested quality plates are used of heavy thickness to make the frame more regid & capable enough to the load during frequent & fast operations
  • All platens are having parallel accuracy , as platens are precisely grinded upto 0.01 to 0.02 mm parallel accuracy, with T-slots/ tapped holes & provision of heating & cooling arrangement as per DIN standards.
  • Precise machining of the structural members is done after normalising to get the parallelism between platen & bed and right angularity between bed & the moving platen.

Downstroking SMC/DMC/FRP Compression Moulding Presses

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.

Standard and Optional Accessories of Compression Molding Presses

  • Heating arrangements in platens
  • Digital PID Controllers – FUJI make
  • Tower Light
  • Safety arrangements i.e. Emergency Push Button, two Hand Push Button, Safety mesh
  • PLC with touch screen for users
  • Friendly operation (OMRON make)
  • Pressure transmitter for pressure Adjustments
  • Limit Switches
  • Lubrication arrangements
  • Photoguard / photo sensor or curtain at front side for safety (SICK , Germany make)
  • Extra PID temp. Controllers
  • Water & air Circulation arrangements for Mould Cooling
  • Two Hand Push Button Stand
  • Linear Scale (LVDT) – Zefran make



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