3 Rolls Plate Bending Machine

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E79

The E79 is a hydraulic 3 roll plate bending machine composed of bottom rolls on horizontal axes and a top motorised roll with hydraulic vertical movement.
The E79 series bending machines are available with a capacity from 25mm to 300mm and roll length from 1000mm to 6000mm.

The E79’s Key Features

BENDING of medium and large thicknesses (recommended from 25 mm to 300mm). It is the ideal machine due to its particular design because it has reduced sizes and a shorter straight section compared to the four rolls, and thanks to the tilt of all three rolls, there is the possibility to perform even complex conical processes, in a much easier way than with four rolls.

The PRE-BENDING obtained is excellent thanks to the high push of the top roll which is used in this phase as a bending press.

REVOLUTION of its geometry: In fact, the bottom rolls move horizontally and are independent from one another with variable pitch, whilst the motorised top roll moves vertically.

VERSATILE: increasing the distance between the bottom rolls very thick plates can be bent, whilst decreasing the distance it is possible to bend thin plates and so create tubes with a small diameter. Having a roll plate bending machine with variable axes is like having two machines in one.

INDEPENDENT: the movement of the three rolls easily allows the creation of cones. The bottom rolls and top roll can tilt independently up to 2°.

SAFE: for the safety of the operators, we made it possible, thanks to its particular geometry, that the plate stays in a horizontal position during every work phase. Furthermore, the machine is set up with an emergency stop push button to immediately stop its movement.

SIMPLE to use and maintain thanks to easy accessibility of the hydraulic parts and the diagnostics on the control panel, that are always within reach of the operator.

DIMENSIONS small and compact in comparison to other bending machines that do not require the foundation pit up to a certain size.

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How to use it

1. Insert the plate between the rolls.
2. Move rolls B & C horizontally so that roll B is under roll A.
3. Move roll A downwards so that the pre-bending is carried out.
4. Repeat the step for the other side of the plate.
5. Position the rolls in the standard pyramid position and close the tube

Alternatively

1. Insert the plate between the rolls.
2. Move rolls B & C horizontally so that roll B is under roll A.
3. Move roll A downwards so that the pre-bending is carried out.
4. Position the rolls in the standard pyramid position and start the bending phase.
5. Repeat the step on the other side of the plate for the second pre-bending.

STRUCTURE of the E79 (CE certified bending machine):

Crossbeams made of electro-welded steel, subjected to normalising heat treatment.

The supporting frames of the rolls’ movement cylinders are made of electro-welded steel and are subjected to normalising heat treatment.

Rolls made of forged and tempered special alloy steel or carbon steel.
– Upper motorised roll with epicyclic reduction gear and hydraulic motor.
– Side rolls with automatic brake system to prevent the plate from slipping;

Linear potentiometers fitted on each roll (two on each roll) that allow electronic control of parallelism between rolls.

Radial bearings fitted on all rolls, self-aligning as double row SKF or FAG branded barrel bearings.

Two pumps or up to six for the bigger sizes for maximum linear and rotational thrust. Having a system with more pumps always produces simultaneous movements, including the possibility of both rotating and pressing up to the maximum capacity. In the event of pump failure, the machine can also be operated even if the performance is reduced.

The cylinders are made of alloy steel and carbon steel with a chrome-plated rod and use seals from the primary brands.

Hydraulic control unit consisting of: motor pump unit, electro valves, pressure relief valves which guarantee overload protection.

Hydraulic opening handles to allow the produced tube removal in horizontal position.

Automatic centralised lubrication system with a pump which has an autonomous tank, programmable from the touch panel.

Siemens, ABB, Telemecanique, Moeller electrical system. It consists of a mobile console control panel connected to the machine with low voltage and a general cabinet where there are all of the other electrical components, as well as the machine control PLC SIEMENS S7.

Independent SIEMENS KTP1200 PN control Touch Panel with a 12” touch screen colour display. By changing pages it is possible to see on the display the position, the balance of the rolls, to setup and read the tilting of the rolls, to set their speed (two rotation speeds), the diagnostic functions and machine alarm.

Modem to remotely control the PLC in the event of software changes and resolution of machine faults.

Air or water cooling system for hydraulic oil.

OPTIONAL ACCESSORIES

– Normalising, induction hardening treatment and surface grinding of rolls
– Device for cone bending
– Hydraulic arm bar for plate alignment
– Hydraulic side arm for plate support
– Hydraulic side arm for double articulation plate support
– Hydraulic side arm for double articulation plate support, complete with hydraulic pistons for handling the tube.
– Hydraulic central overhead plate support
– Motorisation of bottom rolls
– Plate conveyor
– NC control with Siemens TP 1200 Comfort 12” Touch Panel
– Hot- forming package up to 1000°