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Plate Roller

Heavy duty 4 rolls plate roller : 4RHSS (thickness 5/16"- 3 3/8" , length 6'- 20')
4RHSS hydraulic steel plate bending machine uses a planetary gearbox connected to a robust motor to drive the top and side rolls at a 5 & 16 feet per minute. direct linear piston movement for the lateral and pinch rolls is standard for even more forming power. the direct movement feature allows the operator to form tighter diameters with less work.  4RHSS four roll plate rolling machine uses an industrial hydraulic motor to move  rolls. Three digital readouts are also included to give an accurate roll location.  Every steel plate roller includes an operator control pedestal to control all movements of the machine. Integrated safety features, such as a machine tether and emergency stop switch are also included.you can have a CNC plate roller by ordering optional CNC controller.for learning plate bending machine price contct us now.
  • Fully Hydraulic, including Roll Adjustments and Drop End
  • 3-Roll Drive
  • Induction Hardened Rolls
  • Dual Rolling Speeds
  • Three Electronic Digital Readouts
  • Cone Bending Attachment
  • Overload protection system
  • Hydraulic balancing system
  • Hydraulic tiltable top roll
OPTIONAL EQUIPMENT
  • NC And CNC Controls
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • Finished Part Ejector
  • rolls electronic balancing system
  • stepless speed adjustment
  • accumulator for rolling welded parts
4R HSS 60-400 4 Rolls Hydraulic Plate Bending roll<br />
4R HSS 30-380 4 Rolls Hydraulic Plate roller<br />
4 Rolls plate bending roll : 4R HS (thickness 1/16"- 5/8" , length 3'- 13')
4RHS hydraulic 4 roll plate roller uses a planetary gearbox connected to a robust motor to drive the top and bottom rolls at a 5 & 16 feet per minute. direct linear piston movement for the lateral rolls in Ø90-Ø140 models and orbital piston movement in Ø150-Ø260 models.
the direct movement feature allows the operator to form tighter diameters with less work.  4RHS 4 roller steel plate bending machine uses an industrial hydraulic motor to move rolls. Three digital readouts are also included to give an accurate roll location.  Every bending roll includes an operator control pedestal to control all movements of the machine. Integrated safety features, such as a machine tether and emergency stop switch are also included.you can have a CNC plate bending machine by ordering optional CNC controller. to find a plate roller for sale contact us now.
  • Fully Hydraulic, including Roll Adjustments and Drop End
  • 2-Roll Drive
  • Induction Hardened Rolls
  • Dual Rolling Speeds
  • Three Electronic Digital Readouts
  • Cone Bending Attachment
  • Mobile Control Console
  • Overload protection system
  • Hydraulic balancing system
  • Hydraulic tiltable top roll

OPTIONAL EQUIPMENT
  • NC And CNC Controls
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • Finished Part Ejector
  • rolls electronic balancing system
  • stepless speed adjustment
  • top roll covered by DERLIN
4R HS 20-245 CNC 4 Rolls Hydraulic Plate rolling machine<br />
4R HS 1250-100 4 Rolls Hydraulic Plate Bending roll (Linear Type)<br />
4 Rolls plate rolling machine : 4R HMD (thickness 1/2"- 1 1/8" , length 6'- 10')
4R HMD hydraulic bending roll uses a planetary gearbox connected to a robust motor to drive the top and bottom rolls at a 5 & 16 feet per minute. direct linear piston movement for the lateral rolls allows the operator to form tighter diameters with less work.  4R HMD four roll steel plate rolling machine uses an industrial hydraulic motor to move  rolls. Three digital readouts are also included to give an accurate roll location.  Every machine includes an operator control pedestal to control all movements of the machine. Integrated safety features, such as a machine tether and emergency stop switch are also included. you can have a CNC plate rolling machine by ordering optional CNC controller.to get plate rolling machine price contact NovoTech Machine Tools.
  • Fully Hydraulic, including Roll Adjustments and Drop End
  • 2-Roll Drive
  • Induction Hardened Rolls
  • Dual Rolling Speeds
  • Three Electronic Digital Readouts
  • Cone Bending Attachment
  • Mobile Control Console
  • Overload protection system
  • Hydraulic balancing system
  • Hydraulic tiltable top roll
OPTIONAL EQUIPMENT
  • NC And CNC Controls
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • Finished Part Ejector
  • rolls electronic balancing system
  • stepless speed adjustment
4 Rolls plate bending machine with Automatic feeding system : 4R HMS / HS (thickness 1/16"- 9/16" , length 2'- 10')
4R HMS hydraulic plate bending roll is suitable for mass production thanks to automation system for loading and unloading sheets .automatic bending by NC controller enables rolling all sheets in same size and it's a time saving and cost effective soloution for rolling sheets.
  • Fully Hydraulic plate bender, including Roll Adjustments and Drop End
  • 2-Roll Drive
  • Induction Hardened Rolls
  • Three Electronic Digital Readouts
  • Cone Bending Attachment
  • Mobile Control Console
  • Hydraulic balancing system
  • Hydraulic tiltable top roll
OPTIONAL EQUIPMENT
  • vaccume sheet lifting and feeding system
  • automatic bending by NC controller
  • ejector system to feed rolled parts to welding line
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • stepless speed adjustment
4R HS 1250 170 4 Rolls Hydraulic Plate rolling Machine with Full Automatic feeder System<br />
4R HS 700-95/110 four Rolls Hydraulic Plate Bending roll with Full Automatic sheet feeding System<br />
Economic 4 roller steel plate bending machine : 4RM - 4RH - 4RHM (thickness 1/16"- 1/4" , length 3'- 6')
4RH /M 4 roller plate rolling machine is suitable for light plates, aluminium or stainless steel bending . automatic bending by NC controller (optional) enables rolling all sheets in same size and it's a time saving and cost effective soloution for rolling sheets.contac us to learn plate bending machine price.
  • main Roll and lateral rolls of 4RH model bending roll move by hydraulic piston through casette type frame
  • rolls are moving by gearbox in 4RM model
  • 2-Roll Drive
  • Three Electronic Digital Readouts
  • Cone Bending Attachment
  • Mobile Control Console
  • Hydraulic tiltable top roll and Drop end (4RH model only)
OPTIONAL EQUIPMENT
  • Induction Hardened Rolls
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • NC controller
4RH 10-90 NC 4 Rolls Hydraulic Plate Bending Machine<br />
4RH 10-60 high speed plate roller<br />
Cone bending machine : 4R HC  (thickness 1/8"- 3/16" , length 3')
  • 4R HC cone bending machine is suitable for mass production of tight cones
  • Fully Hydraulic, including Roll Adjustments and Drop End
  • 4-Roll Drive by planetary gearbox and hydromotor
  • Induction Hardened Rolls
  • 5 Electronic Digital Readouts
  • Conical rolls
  • Mobile Control Console
  • Hydraulic balancing system
  • Hydraulic tiltable top roll
  • Overload Protection system
  • Manual Central Lubrication
https://www.youtube.com/watch?v=UPEbmpT7900
4R HC four Rolls Conical Bending roll<br />
Corrugated sheet bending rolls : 4ROM and 4RHOM  (thickness 1/16"- 1/8" , length 4'-5')
4ROM and 4RHOM 4 roll bending machines are specially designed to roll galvanized corrugated sheets up to 3mm (1/8") thickness
corrugated iron sheet is mainly rolled for tanks,roofs or silos.the profile can be custome made according to customer request.
  • 2-Roll Drive by electric motor+reducer
  • rolls linear movement by motor (in 4ROM model) and by hydraulic piston (in 4RHOM model)
  • Three Electronic Digital Readouts
  • Mobile Control Console
  • manual drop end in 4ROM and Hydraulic drop end in 4RHOM models

4R OM 4 rolls corrugated plate roller<br />
4R OM 2050x260 4 Rolls Hydraulic Corrugated Sheet roll Bending Machine<br />
3 Roller hydraulic plate bending machine : 3RUHS - 3RHSS - 3RHS - 3RHMS (thickness 1/4"- 3 9/16" , length 6'-10')
3 rolls hydraulic steel plate bender uses a planetary gearbox connected to a robust motor to drive the rolls .direct movement feature allows the operator to form tighter diameters with less work. 3 roller steel plate rolling machine uses an industrial hydraulic motor to move rolls. two digital readouts are also included to give an accurate roll location.  Every metal plate bender includes an operator control pedestal to control all movements of the machine. Integrated safety features, such as a machine tether and emergency stop switch are also included.
  • Fully Hydraulic, including Roll Adjustments and Drop End
  • 3-Roll Drive
  • Induction Hardened Rolls
  • Dual Rolling Speeds
  • Two Electronic Digital Readouts
  • Cone Bending Attachment
  • Overload protection system
  • Hydraulic balancing system
  • Hydraulic tiltable top roll
OPTIONAL EQUIPMENT
  • NC And CNC Controls
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • rolls electronic balancing system
  • stepless speed adjustment
  • accumulator for rolling welded parts
  • profile bending rolls
3R HS 20-300 three Rolls Hydraulic Plate bender roll<br />
3R UHS 40-450 3 Rolls VARIABLE GEOMETRY PRESS-ROLL<br />
Hydraulic Initial-Pinch Plate rolling machine with Powered Rear Roll : MRM-H (thickness 1/16"- 1/2" , length 2'-10')
  • Fully Hydraulic metal plate bending machine, including Roll Adjustments and Drop End
  • 2-Roll Drive
  • Two Electronic Digital Readouts
  • Steel-Welded Main Frame
  • Hydraulic Drop End
  • Mobile Control Panel
  • Motor Powered Centralized Rolls
  • Hydraulic Adjustment of Rear Roll and Lower Front Roll
  • Main Motor with Brake System
  • Planetary Gearbox Driven
  • Cone Bending
  • Rear Roll Journalled in Roller Bearings
  • Built According to EC Safety Directives (CE Mark)
  • SAE 1050 Certificated Steel Rolls with High Tensile Strength
  • you can always find a plate bending machine for sale in NovoTech Machine tools
  • SAHINLER is largest plate rolling machine manufacturer in Turkey


OPTIONAL EQUIPMENT
  • NC Control
  • Overhead Support
  • Hydraulic Side Supports
  • Ground and Polished Rolls
  • dual speed adjastment
  • stepless speed adjustment
  • wire grooves on rolls end
  • hydro motor
MRM H 3050x190 initial-pinch hydraulic Bending roll<br />
SAHINLER METAL introduction video<br />
Initial-Pinch bending roll with Powered Rear Roll Adjustment : MRM-S (thickness 1/8"- 3/8" , length 3'-10')
  • in MRM-S bending roll machine Two Rolls are Powered by a Belt Driven Worm Type Gearbox, Gear and Chain System
  • Mobile Foot Control
  • Central Lubrication
  • Precise Bending with Brake Motor
  • manual drop end
  • Extended Roll Shafts for Angle & Shape Bending
  • Steel-Welded Main Frame
  • Cone Bending
  • MRM-S three roll bending machine has been Built According to EC Safety Directives (CE Mark)
  • SAE 1050 Certificated Steel Rolls with High Tensile Strength

OPTIONAL EQUIPMENT

  • Digital readout for back roll
  • induction hardened rolls
  • motorised bottom roll
  • plastic coated top roll for aluminum bending
  • Ground and Polished Rolls
  • stepless speed adjustment
MRM-S 2050x170 initial pinch Mechanical Plate Bending roll<br />
MRM S 2050x170 initial pinch Plate roller<br />
Hydraulic Initial-Pinch 3 roll Bending machine : 3R MRM-H and 3R HMD (thickness 1/16"- 7/16" , length 4'-6')
  • in 3R MRM-H roll bending machine 3 Rolls are Powered
  • hydraulic plate rolling machine with powered back roll
  • Mobile Control panel
  • Precise roll plate bending machine with Brake Motor
  • manual drop end
  • Cone Bending
  • Built According to EC Safety Directives (CE Mark)
  • SAE 1050 Certificated Steel Rolls with High Tensile Strength

OPTIONAL EQUIPMENT

  • Digital readout for back roll
  • induction hardened rolls
  • Ground and Polished Rolls
Initial-Pinch 3 roll steel plate rolling machine : IRM (thickness 1/16"- 3/16" , length 3'-8')
  • in IRM plate bending rolling machine 2 Rolls are Powered
  • Mobile foot pedal
  • Precise plate roll bending machine with Brake Motor
  • casted frame steel sheet rolling
  • manual drop end
  • Cone Bending
  • Built According to EC Safety Directives (CE Mark)
  • SAE 1050 Certificated Steel Rolls with High Tensile Strength
  • wire bending grooves on rolls

OPTIONAL EQUIPMENT

  • Digital readout for back roll
  • induction hardened rolls
  • Ground and Polished Rolls
  • powered back roll adjustment
IRM 1270 x 140 powered slip roll<br />
IRM 2050x130 3Roll Motorized slip roll<br />
Slip roll : HRM - RM - IR - R -RS (thickness  24-11 gauge , length 1'-8')
  • Mobile foot pedal (motorised models only)
  • Precise Bending with Brake Motor
  • casted frame sheet metal slip roller
  • manual drop end
  • SAE 1050 Certificated Steel Rolls with High Tensile Strength
  • wire bending grooves on rolls
  • you can find a desired slip roller for sale in NovoTech Machine Tools

RM 1270x90 3Roll Motorized Plate Bending roll<br />
IR powered slip roll<br />
3-IN-1 SLIP ROLL - SHEAR - BRAKE MACHINE : CMS ( lenght: 2'-4' , thikness :17-20 gauge)
  • The CMS  is a manual shear, press brake, and metal slip roller all in one. Great for hobbyists, maintenance, and R&D shops, this combination machine saves space.
  • Maximum capacity of 20 gauge mild steel for all functions.
  • Slip roll forming machine on top has hardened and polished shafts for long life.
  • 3 grooves in the roll let you form wire perfectly.
  • Press brake portion in the middle gives you a maximum bend angle of 90° for perfect corners.
  • You can tighten or loosen the frame and adjust the camber of the tooling for consistent bending across the material.
  • Shear station uses hardened, reversible blades that stay sharp over a long lifetime of us.
  • Spring-loaded hold-down will save a time and waste when you’re shearing.
  • Large, double-sided handles allow 2 operators to apply force.
  • You get one full up-down cycle out of each tool with one 360° turn of the handle.
  • Manual back gauge ensures repeatability on shear and brake projects.
3 in 1 sheet metal brake roller shear<br />
What is a plate rolling machine?
A plate rolling machine is a machine that will roll different kinds of metal sheet into a round or conical shape.
Plate rolls are the ideal machine for metal sheet pre-bending and rolling.
Plate rollers are used to manufacture rounded parts for oil and gas rigs, tunnel supports, boiler equipment, pressure vessels, and heat exchangers among many other things.
A plate bending roll creates a mechanical advantage by pressing a metal sheet between a top roll and two side rolls. The mechanical advantage allows the machine to press the sheet firmly against the rolls, bending it into a conical or spherical shape. Throughout the process, a pinch roll is typically used to hold the metal plate in the correct position.
Plate rolling machines are extremely powerful and able to bend metal sheets of varying thicknesses (typically between 1/16 to 4 inches). Plate rolls come in 3-roll or 4-roll models.
4-roll models could be CNC automated and specifically designed for large-scale, high-volume plate bending needs.
Whilst four roll machines produce fast, accurate bends, three roll machines are ideal for fabricators working with a wide range of material thicknesses and types.

 
How to choose a right plate roller?
Rolling is similar to forming sheet metal with press brake; it can be a "black art" or maybe magic, but in reality it is neither.
Part of taking roll forming out of the realm of "black magic" is selecting the right sized roller for the job. A good "rule of thumb" for three and four roll machines is that you can roll sheet or plate at 1.5 times the upper roll diameter.
If the top roll has a 10-inch-diameter, the minimum best practice "roll­able" inside diameter will be 15 inches.
To determine the proper plate roll sizing, it is critical that yield, tensile strength, width, thickness, and diameter (or radius) of the part are all considered because for example, a higher yield or tighter diameter will require more pressure to form.
Minimum and maximum width is also important because even something as straightforward as material thickness can vary, yet still fall into accepted plate and sheet mill tolerances.
On the application side, you will need to know the minimum and maximum diameter of the cylinders to be formed.
You’ll also need to know if you will be making cones or special shapes as this will determine the correct type and size of plate roll.
Almost all machines achieve precise measurements working at 50% of the full­ rated value of the roll.
One of the key decision-making factors you should consider is not only what type of plate bender will meet your current needs, but which could also satisfy future business needs.

4 roller plate bending machines
Four-roller machines have a top roll, the pinching roll, and two side rolls. These plate rolling machines produce the fastest and most accurate bends.
The flat metal plate is placed in the machine on either side and "pre-bent" on the same side. The side rolls do the work of bending. The pinching roll holds the plate.
Plate held securely in place between the top and bottom rolls, while the side rolls move vertically to create the bend. Bottom roll moves up to hold the plate surface securely against the top roll while the side roll is raised to form an accurate pre-bend, minimizing the flat zone on the plate edge.
Plate feeding can take place on either side of a four-roll machine. If fed from only one side, they can be placed up against a wall to save floor space.

4 roll plate rolling machine working principle

Side rolls positioned to the right and left of the bottom roll and on their own axes. The independent axis of each roll helps make a perfect bend. The back-side roll (at the far side of the feeding point) also functions as a back-gauge to square the plate for proper alignment which eliminates the need for someone to assist the operator.
Plate is kept square without slipping during both pre-bending and rolling because of the constant secure clamping of top and bottom rolls.
Four-roll machines do not require the operator to remove, flip, and then try to square the plate a second time after pre-bending, (this is not possible in three-roll, initial-pinch machines.)
A cylinder can be rolled to the required diameter immediately following pre-bending because the material can be kept in the machine.
Bending the back edge takes place after the cylinder is rolled allowing for a one-direction, single-pass operation.
For cone-rolling on a four-roll machine, the side rolls can be tilted to establish the cone angle, and the bottom roll also can be tilted to clamp and drive the major end of the cone.
4 roll benders make it possible to create rectangular, elliptical and square-shaped output by carefully bending the metal in specific areas as it passes through the machine.

3 roller double-pinch plate rolling machines
Three-roll, double-pinch machines are available in light to very heavy capacities and do not require the operator to remove, flip, and then try to square the plate a second time after pre-bending, as is the case with three-roll, initial-pinch machines. Cylinders can be rolled to the required diameter immediately following pre-bending because the material can be kept in the machine (this is not possible in three-roll, initial-pinch machines)

3 roller double-pinch plate bending machines working principle

Side rolls positioned to the right and left of the top roll and are on the same axis. The axis of each roll helps make the bend. The back-side roll also functions as a back-gauge to square the plate for proper alignment which eliminates the need for someone to assist the operator.
For cone rolling on a three-roll, double-pinch machine, the side rolls can be tilted to establish the cone angle.
Pre-bending on a three-roll plate rolling machine requires that plates be tilted down as they are being fed whereas on a four-roll machine plates are loaded horizontally at the feed level which allows the use of horizontal motorized roller tables to help feed the plate.

3 roller initial-pinch plate bending machines
single-pinch bending machine requires inserting the sheet metal twice to pre-bend both ends. However, there are also double-pinch models available to make pre-bending processes on both ends easier, faster, and more precise.

3 roller initial-pinch plate bending machines working principle

Single initial-pinch plate rolls are generally only suitable for light-capacity applications. They can be electromechanical or hydraulic and work by pinching the flat sheet between two vertically opposed rolls while the third bending roll moves upward to contact then bend the sheet. These tend to be older machines which in most applications require removal and reinsertion of the sheet to prebend both ends so although cost-effective they are more labor-intensive in a production setting than their modern counterparts.

3 roller variable geometry plate bending machine
The widest range of material types and thickness in relation to the size of the top roll can be rolled on three-roll, variable-geometry machines. They are suitable for medium and thick plate bending.

3 roller variable geometry plate bending machine 3R UHS series

The three-roll variable pitch works by having all three rolls able to move and tilt. The top roll moves in the vertical plane and the side rolls move on the horizontal plane. When rolling, the top roll presses the metal plate between the two side rolls. The advantage of having the variable three roll is the ability to roll many thicknesses and diameters of cylinders.Three-roller machines have one pressing top roll and two pressing side rolls.

3 roller variable geometry plate bending machine working principle

For example; The side-rolls are what produce the mechanical advantage. With the side rolls all the way open, one has the maximum mechanical advantage. With the side rolls all the way in, you have the least mechanical advantage. So, a machine has a capability of rolling 2-inch-thick material with the maximum mechanical advantage, but a job is only 1/2 inch thick. Reduce the mechanical advantage and one has a machine that can roll from 1/2 to 2 inches thick.
The independent axis of each roll helps make a perfect bend. The back-side roll (at the far side of the feeding point) also functions as a back-gauge to square the plate for proper alignment which eliminates the need for someone to assist the operator.

Static pre-bending and Dynamic bending
There are two types of plate bending processes. Static pre-bending is where the metal sheet is held stationary while a roll runs upward along the sheet, bending the leading edge. Dynamic bending, on the other hand, is where the plate or sheet is in motion while running through the machine. The motion of the sheet allows the machine to work more efficiently, thus increasing the sheet bending thickness.

Cone bending
The plate roller can also be used to create a cone shaped piece of metal.  In order to do that the metal plate must be cut to the proper size before it is bent. A sheet metal cone can be formed by pre-cutting a flat metal blank with the correct inner and outer radius to form the cone shape wanted.  The blank is fed on one side so that the inner radius can be held against a cone rolling attachment. The inner radius is fed through the roller at a slower rate than the outer radius. This process can be a little more difficult and needs to be very exact so cones take a lot of time to fabricate.

cone bending by 4 roller plate bending roll

Both the three-roll and the four-roll machines are capable of inclining the forming rolls in a positive attitude, and both should have a hardened contrast die to control and slow down the speed of the small diameter.

cone bnding process by a plate roller

Guiding the small diameter and inclining the rolls are necessary to roll a cone. In this case you are creating an unnatural situation for the rolling process. Because on a three-roll double pinch machine all three-rolls are driven, it makes it difficult for the contrast die to retard the rotation on the small diameter while making the large diameter move faster.
A four-roll machine which has inclinable forming rolls and a hardened contrast die, will roll cones better than a three-roll.

Controller
Plate rollers can be powered and controlled in multiple ways. Older plate mills are driven by electric motors and newer ones are directed by programs which are loaded into the CNC controller.
DRO: machine comes with Three digital readouts for easy roll positioning as standard accessory. you can set travel limit for each roll on DRO to avoid material over bending by mistake.
NC teach-in controller: In teach-in mode, operator’s all movements are recorded in the controller. In automatic mode all recorded movements are repeated. NC control system has the capacity to save numerous programs. Edit mode allows creating programs manually by inputting rolls position values.
programmable roll bender can improve your capabilities in repeat operations
CNC controller: starting from a menu of standard shapes (cylindrical, oval, polycentric, bucket etc.) and simply entering the shell data (radius, thickness, width, type of material) the control creates the drawing of the workpieces automatically and the complete bending program with all the necessary bending steps. If necessary, the program which theoretically calculated by the controller can be easily optimized by the operator.

plate roller controller

Handling and automation options:
Your plate rolling application could require side and overhead supports, automated loading tables and in-feed conveyors, or automatic part ejectors. Don’t forget these important productivity tools when choosing a new plate rolling machine!

automatic infeed and ejector for plate roller

overhead supports can prevent light materials from collapsing when rolled to large diameters. A side support can also assist in preventing light materials from recurving toward the floor if the radius is very large.
 
overhead and lateral supports for plate roller
 
Rolls crowning
Steel plate rolls–whether they have two or three bottom rolls–all have a top roll. The top roll can be sized to roll plate into cylinders or cylinder segments to radii close to the diameter of the top roll.  However, relatively small top rolls can deflect in the center under the pressure of curving steel plate.  Alternately, larger-diameter top rolls deflect less but limit the machine to rolling only larger diameters.

rolls crowning in plate bending roll
Benders and rollers, those who specialize in curving steel plate among other steel products, are asked to roll a variety of plate widths, lengths and thicknesses.  Some of the possibilities will cause deflection of the top roll in the rolling process.  The result will be the plate cylinder with a barrel form and ends that are not parallel.
With plate rolls that have a long top roll with a small diameter, you will see more deflection. Imagine standing on the middle of a wood beam supported at two ends. As the length on the wood beam gets longer, the deflection where you are standing would sag downwards more. The same concept is applied to steel plate rolling.
To compensate for this deflection in a plate roll, the top roll is “crowned.”  A “crown” is the barrel shape of the top roll that is needed to obtain a uniform distribution of the pressure required for the rolling of steel plate. A plate roll has supports at each end and the top roll deflects in the middle when the plate is in motion. This affects the parallelism on the edges of the rolled part.
Insufficient crowning will create an unsatisfactory roll form with barrel effect (where the part has a greater diameter in the middle than at the ends) and hourglass effect (the material is tighter in the middle than on the ends) both possible deformations that can be caused.
Most metal fabricators need a plate roll to work with numerous materials which will affect the plate rolling machine’s rolls in different ways. As a result, rolls are machined with optimal crowning which is typically 75% of nominal capacity if yield, width, diameter, pinch pressure, and speed are equal.
The range of a roll (thickness/width/diameter) depends on the tolerance, with accepted variance of your parts. Options can be installed on the plate rolling machine to adjust for different tolerances and specific crowning can be applied to reach the desired range of material characteristics and part tolerances.
 
Hardened rolls:
The harder materials and laser/plasma cutting techniques used today require hard outer roll surfaces on rolling equipment. A hardness rating from 50 to 55 Rockwell C scale will have a reasonable penetration depth and provide long-lasting protection against roll surface wear. A hardness rating exceeding 60 will have a shallow penetration and will likely result in cracking or crazing of the roll surface

workpiece finish
Although traditional rollers produce quality, accurate products, they are by no mean polished. If you need a finish free of marks then you’ll have to invest in precision ground rollers which produce a polished finish, but can be more easily damaged. in order to roll aluminum composite, you can choose segmented rolls coated by plastic to avoid scratches on workpiece.
 
aluminum composite rolling by segmented roll coated by plastic
 
Safety issues:
Most new plate rolling machines are equipped with safety devices such as emergency-stop buttons; safety trip wires; 12-VAC, low-voltage control circuitry; and detached operator control consoles. It is however still your responsibility as the owner to ensure the installation and proper use of these operation safety guards or devices.
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