Three Roll Planetary Axis

More About Three Roll Planetary Axis

The three roll planatory axis is a three roll machine having pre pinching/pre bending facility within the machine. The plate can be inserted from one side and is clamped between top roll and one of the pressure roll for a firm grip and the another pressure roll advances further to form desired radious of shell. The same procedure is repeated but on another side of plate to form desired radiouse. After having done pre pinchind the plate is formed in to circular shape by rolling and further pressing of pressure rolls and by forward and reverse movement of rotation by rolls. Usually a shell is formed in multiple passes of rolling by forward and reverse movement of rolls in rotary motion. It is also possible to form shell in a single pass provided the pressure roll position is well known for particular size of shell rolling by regular practice and experience. The PLC based machine is most suitable for repetitive type of jobs and shapes required regularly Other shapes can also be forme in this machine in single pass like square, polycentric,elliptical or open rolling.

Tiltable top roll can also be provided in machine as special feature for machine having long bed length than 1500 mm roll table to ease of rolled shell removal.

All our machines come with ball bearing fitted on rolls as roll support for rotation which reduces friction and more power is available for work. Many machine in market are still using bush as a roll support wasting lot of power to overcome friction between sliding surface ane are less efficient machines.

All our machines with electrical and PLC based controls a special feature is incorporated for pressure roll synchronization to achieve perfect parallel between top roll and pressure roll. All our PLC machines are fitted with proportional valve and can achieve synchronization up to 0.2 mm within both side of pressure roll.

The electrical mode machine has a control desk with digital meter showing roll position of both the pressure rolls. The PLC mode machine has the pressure roll position indicated on HMI With the help of this position meter one can get repetitive results for same size of rolling by maintaining pressure roll position values

Planetary Guides

Since the machine in consideration has a planatory axis movement of pressure rolls the force applied to clamp / pinch the plate and also to form radiouse is much higher due to leverage available and can perform better compared to rectilinear guide type machine.

Conical Bending

As a standard available feature for coniocal bending/rolling the one side of pressure rolls are tilted to desired angle and smaller side of cone can be rolled on this side. As a special requirement the machine with roll tilting facility from both side can also be provided on request.

We have in house facility for precise roll machining and grinding.

Standard Featues

  • All 3 rolls are positively driven by in line mounted planetary gear box and hydraulic motor Roll parallelism maintained by solid linkage mechanism
  • Digital display for roll position for ease of rolling and for fast rolling of repetitive type components
  • Spherical roller bearings are used as standard in all our models
  • Heavy duty reinforced steel frames duly stress relieved and epoxy painted after sand blasting

Optional Features

  • Electronic proportional balancing using hydraulic system specially developed for plate bending a machine
  • Induction Hardened rolls for 52-55 RC hardness
  • Conical bending device
  • Provision for section rolling
  • Section bending dies
  • Overhead support
  • Lateral support
  • Auto plate squaring reference stopper
  • Tilt able top roll
  • Automatic roll speed compensation


  • More suitable for small engineering work shop where bending requirement in small quantities and in different sizes as per job requirement
  • Less costly compared to 4 roll machine, hence low initial investment
  • Both leading and trailing edge can be pre bend in single pass. No need to remove and reinsert material
  • Small engineering workshop willing to invest less still automate rolling
  • Open type rolling requiring mass production quantity
  • Can use as a straightening machine for pre formed material for reuse
  • Can use where different operations like pre bending, rolling, material straightening ,Conical rolling, section rolling need to be carried out in single machine.


  • Railway: water tank, tankar, coach bogie wall profile bending/rolling Automobile: silencers, fuel tanks, mufflers',
  • Offshore: drill rings
  • Storage: silos,tanks,
  • General engineering: Pressure vessal,boiler, tanks, piping, filter body
  • th moving: Excavator bucket, road roller drum, mobile compactors