312HV4 DOUBLE PINCH ANGLE ROLL Precision Engineered for Dependability Backed by the Best Guarantee in the Industry! CARELL In-Stock Specials Request-A-Quote Angle 8" • Pipe 10" • Flats 16" Capacities* Flats Hard: 8"x 2-¼" Ø80 Flats Easy: 16"x 3" Ø80 Pipe Schedule 40: 10" Ø150 Angle Leg-In: 8"x ¾" Ø168 *with standard equipment 312HV4 Specification Chart Series PDF Brochure CARELL's 312HV4 double initial pinch universal roll bending machines are available with 6 way m ulti-axis adjustable lateral guides, variable speed powered rotation of all three bending rolls and i ndependent hydraulic adjustment of the lower rolls for double pre-bending. This versatile unit is ideal for rolling standard/special sections plus tube & pipe in a variety of material types. The 312HV4 Series Universal Roll Set is designed for bending standard profiles , flat bar (on flat and on edge), square bar, tees, channel as well as round bar, square & rectangular tube sections, angles leg-in, leg-out and can be setup to operate in horizontal or vertical position adding further value to your production. Standard Features Dual LED Digital Displays monitor bending roll positions Rigid, one piece solid steel weldment frame , normalized and precision machined Larger, high strength steel shafts , heat treated and ground Independent hydraulic adjustment of both lower rolls for double pre-bending 3 Shafts Driven with 3 Independent Direct Coupled Hydraulic Motors and Planetary Speed Reducers for 100% efficient torque delivery Universal bending rolls with modular components, hardened and wear resistant. Variable Speed rotation via electronic proportional valves for precision pre-bending control Multi axis, 6 way, fully adjustable lateral guides , hydraulic powered in all three directions Options Rolls for tubes pipes, and special profiles Tooling for production of half tubes Overhead Supports for coil production Compression and Tension tooling for C, & I hard way NC and CNC Controls with various automation levels for repetitive jobs and production of variable radius bends and parts with multiple bends LED digital displays for movements on lateral material guides ​

Welcome to Our Testimonials Page Here are just a few of our thousands of satisfied customers If you would like to be featured, contact us for more information Request-A-Quote Red Pepper Forge Inc - Carell MT500 & Eagle Model CP40-H We have been the proud owners of a CP40-H and MT500 for many years. Your company has given us great service and your products are high quality and long lasting with few maintenance issues. Thank you Jim Bomba, President, Red Pepper Forge, Inc. Howden - Carell 4RH 6/3 & Eagle Model CP40-H Howden North America first purchased our Carell CNC plate roll back in 2000 for our South Carolina facility. The machine was subsequently related to our plant in Mexico City. Throughout these sixteen years, we have found the Carell Plate Roll to be of outstanding quality, very reliable. Carell has always been very responsive and have provided excellent support both while machine was in SC, then in Mexico. I would certainly recommend Carell and Eagle. David G. Smith, Operations Director Howden North America, Managing Director Howden Mexico Laser Fabrication and Machine Co. Inc. Carell 303HV Angle Roll + 4RH CNC 8/7 Plate Roll + E-Matic CE/CN Bender, Eagle BA50 Section Roll My company has purchased several pieces of equipment from Carell Corporation. They have always provided excellent customer service. Their pricing is competitive and equipment arrives quickly. The equipment efficiently performs the tasks it was purchased to do. I will use Carell Corporation in the future. Alyson Orth, Laser Fabrication and Machine Co. Inc. Impact Storefront Designs - Carell ETM60 & Eagle CP30 Impact Storefront Designs is a team of building envelope specialists primarily focused on the fabrication and installation of glass. curtain wall, and storefront products. However, when we decided to tackle custom railing fabrication we turned to Eagle Bending Machines & Carell Corporation. Our team is now able to produce custom bent railings and metal work with superior craftsmanship. Our Eagle CP30 Roll Bender and Carell ETM-60 Rotary Pipe Bender has helped continue our tradition of top quality metal work as seen in our latest accomplishment at the Uncommon Charter School in Newark, NJ. These machines give us excellent results regardless of the magnitude of the project. ISD’s vision is one of simplicity; to fully control the fabrication, delivery, and installation of pre-assembled storefront products and our Eagle & Carell Bending Machines have also allowed us to add to the vast catalog of specialty products that we offer our customers. Mike Fileti,Operations Manager, IMPACT Storefront Designs Purolator Facet Inc. - Carell 3 & 4 Roll Plate Rolls of various sizes February, 2016 We at Purolator were interested in 4 roll plate rolls for long and small diameter perforated filter tubes with short unbent flats and perfect cylindrical dimensions, ready for our seam welding machines. These machines were auto-cycle and the operator does not need to touch the sheet. I was recommended to contact Carell by another engineer at Purolator that had made several prior purchases of other Carell rolls. We spoke to Mr. David Donnell who assisted us with the valuation and final equipment recommendation. We received 3 competitive proposals and chose Carell. We were completely satisfied with these 2 new Carell rolls. The machines worked as promised, which for me means a successful project. When contacting Carell, they are always responsive. They have Great customer service! The whole experience was nothing less than Excellent, and I would certainly recommend Carell Corporation to others. Doug Moser, Sr. Metals Design & Manufacturing Engineer , Purolator Facet, Inc. Sears Welding & Fabrication Sears Welding & Fabrication - Carell 307 Angle Roll + 8' x 3/8" Plate Roll I have depended on Eagle Bending & Carell for roll benders, custom tooling and technical support for quite a while. They are great to work with and quick to respond with quality equipment and the information I need." Pat Sears, Sears Welding & Fabrication Sonoco Steel Reels - Carell 308HV & 305HV Angle Rolls When you need the strength and durability of a steel reel, Sonoco has the product for you. When Sonoco began looking to purchase equipment to roll flat bar, I beam and channel, we looked to Carell Corporation because of their service and reputation for reliability. We spoke with Mr. Bill Richards at Carell. He was very knowledgeable about our application and helped guide us through the process of making the right equipment choice for our needs. In fact, we've been so pleased with the experience that we recently purchased additional equipment from them. If you're looking for reliable equipment backed by great technical support and service, look no further than Carell Corporation. Doug Ainsworth, Sonoco Steel Reel

CARELL & EAGLE PRODUCT APPLICATION VIDEO DEMONSTRATIONS BACK TO TOP CLICK QUICK REFERENCE BELOW TO JUMP TO YOUR CATAGORY PLATE ROLLS ANGLE ROLLS EAGLE BENDING MACHINES TUBE & PIPE BENDERS ORNAMENTAL BENDERS & BAR WORKERS HORIZONTAL PRESSES CLICK IMAGE TO PLAY VIDEO PLATE ROLLS PLATE ROLLS BACK TO TOP CARELL 4 Roll Plate Roll with Stradivari CNC Control by PARMIGIANI CARELL Automated Production Systems CARELL 4-Roll Plate Rolls VBH Series CARELL-TV40 3 Roll Plate Roll CARELL 2 Roll Part Demo CARELL - FAMAR CPI 30 1 6 SP Round Tube ANGLE ROLLS ANGLE ROLLS BACK TO TOP CARELL - 3000 series Angle Rolls by COMAC CARELL Angle Rolls by COMAC Overview CARELL 307HV4-CNC Independent adjustment of both lateral bending rolls CARELL 304HV with Easy Clean Pancake Coil Application CARELL 305CNC ShortShaft with Tooling for Steel Pipe Coils CARELL 304Hv extended shaft with Molding Tools EAGLE EAGLE BENDING MACHINES SECTION BENDERS BACK TO TOP EAGLE - BA35 in Motion EAGLE - CPS20 Stainless Steel Coil EAGLE - Falcon Motorcycles custom exhaust pipe fabrication EAGLE - CP30PRM Bending Aluminum Profile EAGLE - CP40H with ATSC Spiral Device EAGLE - CP40H Spiral Device-Part 2 TUBE & PIPE TUBE & PIPE BENDERS BACK TO TOP CARELL ETM Series Tube & Pipe Benders by Memoli Carell UNI76 Rotary Bender w Mandrell Support Arm rolling pipe CARELL PEDRICK D20 - Bending 5" Pipe CARELL ETM90 - Solid Round Stock CARELL ETM Series Tube & Pipe Bender Control Overview CARELL ETM60 Tube & Pipe Bender ORNAMENTAL ORNAMENTAL BENDERS & BAR WORKERS BACK TO TOP CARELL-SIMASV T22 Scroll Articulated Former - Single CARELL-SIMASV T22 Scroll Articulated Former - Flat Stock ​ ​ CARELL-SIMASV T22 Scroll Articulated Former - Square Stock HORIZONTAL PRESSES HORIZONTAL PRESSES BACK TO TOP CARELL offers the trusted line of SIMASV Horizontal Presses CARELL T22 Articulated Former by SIMASV - Flat Stock ​ ​ CARELL T70 SIMASV horizontal bending press - 2 Axis Programming CARELL T100 SIMASV horizontal bending press - 100 tons power CARELL T120 SIMASV horizontal bending press - "Smart Factory" intelligent with 120 tons power! CARELL T150 SIMASV horizontal bending press - strong and sturdy w/150 tons power! ________________________________

NEW PRODUCTS Tube & Pipe Benders NEW for 2023! ETM H63 The new ETM H63 benders are ideal for machining thin tubes without deformation! Its semi-automatic, compact, high performance bending functions are performed automatically, while feeding & rotation of the tube between bends is performed manually. Simplicity, sturdiness and precision are the key features of this particularly cost-effective line. BACK TO TOP NEW PRODUCTS NEW! CUSTOM FORMING MACHINES 3R-SP 350 x 6.35 CUSTOM FORMING MACHINE The H3R-SP 350 x 6.35 Forming Machine is designed to form a pattern in pre-rolled and welded seam tubes to a specific pattern in 3 tube widths. This machine design incorporates a top roll and a pinch roll fitted with hardened profiled rings in order to obtain the final shape of the tube. NEW PRODUCTS True Pyramid Plate Roll NEW! PIR 8' x 5/16" The PIR 8’ x 5/16” is a True Pyramid Plate Roll with 3 driven rolls, hydraulic movement of top pressing roll and a hydraulic pre-bend bottom brake shoe Custom Built in 2022 for the US Coast Guard! Tube & Pipe Benders ACH SERIES CARELL & Memoli presents a new series of 3-axis CNC tube benders for the linear bending of tubes up to 2-1/2 inches (65 mm) in diameter. The ACH series machines are fully automatic bending machines with CNC 3 axes: bending (Y axis), advancement (X axis) and rotation (Z axis). This hybrid tube bender has been developed for accuracy & control of bending tubes and profiles. The main axes are electrically controlled, while the auxiliary axes are hydraulically controlled. ​ Section Benders EAGLE - BA40 & BA55 Eagle’s NEW CNC Machines augment our current BA20, BA35 & BA50 CNC models and incorporate the same renowned CNC Control Systems. The Pyramid style BA40 and Double Pinch style BA55 allow material feeding from both left and right with the added advantage of also being truly universal general job shop machines PROBENDING® SYSTEM BA55 BA40 Real Quality and Value are found in the Details... See The Difference for Yourself !

305HV DOUBLE PINCH ANGLE ROLL Precision Engineered for Dependability Backed by the Best Guarantee in the Industry! CARELL In-Stock Specials Request-A-Quote Series PDF Brochure 305HV Specification Chart Shown with Coiling Option CARELL's 305HV roll bending machines are available with 6 way m ulti-axis adjustable lateral guides, powered rotation of all three bending rolls and i ndependent hydraulic adjustment of the lower rolls for double pre-bending. This versatile unit is ideal for rolling standard/special sections plus tube & pipe in a variety of material types. The 305HV Series Universal Telescoping Rolls are designed for bending profiles , flat bar (on flat and on edge), square bar, tees, channel as well as round bar, square & rectangular tube sections, angles leg-in, leg-out and can be setup to operate in horizontal or vertical position adding further value to your production. Angle 3" • Pipe 2-1/2 " • Flats 5" Capacities* Flats Hard: 3" x 5/8" Ø30 Flats Easy: 5" x 1" Ø26 Pipe Schedule 40: 2-1/2" Ø32 Angle Leg-In: 2-1/2" x 5/16" Ø42 *with standard equipment Standard Features Rugged one-piece solid steel weldment frame H igh Strength Steel Shafts journaled in self aligning bearings for optimum performance and e fficiency Dua l L ED Digital Displays monitor bending roll positions Double Pinch G eometry permits pre-bending of leading & trailing ends of the profile without removal from the machine Telescoping modular multi-component roll set specifically designed to bend standard sections including angle leg-in/out and square/rectangular tube, as well as other shapes in a variety of material types Tri-Directional Lateral Guides with cam rollers for correcting inherent twist when rolling angle leg-in Heavy duty solid gears & motor/reducer group designed for maximum torque efficiency to all rolls Operates in bo th horizontal and vertical orientations Options Rolls for tubes pipes, and special profiles Tooling for production of half tubes Overhead Supports for coil production Compression and Tension tooling for C, & I hard way NC and CNC Controls with various automation levels for repetitive jobs and production of variable radius bends and parts with multiple bends Powered Movements on lateral material guides on models 302HV through 307HV LED digital displays for movements on lateral material guides ​

BACK TO TOP 2 Roll Plate Rolls Perfect Rollin g Without Surface Marring or Contamination! CARELL In-Stock Specials Request-A-Quote Our 2 Roll Units are designed to rapidly produce radius and cylindrical parts from start to finish at the touch of a button in a cost-effective manner. Machines engineered for high speed continuous production. Easy setup using durable mechanical and electric limit devices. Add an auto loading and ejector system and the unit becomes a powerful tool, reducing part throughput & handling time to an absolute minimum. STANDARD FEATURES High speed one pass rolling Quick set-up and adjustment Eliminates leading flat ends Tight tolerance rolling of round parts even using sheets with cutouts, voids and perforations Machine frame in heavy steel plate and structural sections, electro-welded, stress relieved and precision CNC machined Urethane roll driven by electric motor, inverter and gear reduction or hydraulics Powered drop end actuated in automatic or push buttons Top roll sheet support arm, manual preset, max. diam. 27” All rolls mounted in spherical roller bearings Urethane roll stroke setting via precision dial gauge hand wheel or electrics Urethane roll pinch carriage up/down by hydraulics Sheet feed support with squaring arm Low Voltage Controls, mounted on detached command pulpit with push button controls, positive leveling of lower roll Manual forced lubrication OPTIONAL EQUIPMENT Sheet-Loading systems Cylinder ejector systems Automated sheet alignment systems Sheet pallet shuttle systems Special machine configurations for dedicated production jobs Various Overhead Support configurations NC & MULIT-AXIS CNC Controls for Automatic Production 2 Roll Models are available in lengths From 20” to 78” and 28 Ga to 0.125” thickness Dedicated Cylinder Rolls or Dedicated Cone Rolling Machine No finish deterioration of part surface The High Durometer Urethane coated lower roll allows perfect rolling of polished aluminum alloy, stainless steel or mirror finished materials without surface marring or contamination. Reduce / Eliminate un-bent flats and produce perfectly aligned seams with maximum pressure between the top and pinch rolls, perfectly parallel seams are achieved with virtually no un-bent flats. Choose from over 30 standard sizes. All can be tailored to your specific production needs. Carell 2 Roll Auto-cycle machines can also be built as production cells Q-SERIES

Innovation, Quality & Performance Backed By Decades Of Experience 251-937-0947 Contact Us Today for More Details! Carell provides a wide range of models, options and tooling to match almost any budget to meet your needs at all levels of production. Please fill out the required fields in the form below as complete as possible about your interest and a representative of Carell or Eagle Bending Machines will get back to you as soon as possible. Request Form QUOTE REQUEST TOOLING REQUEST PLATE ROLLS VERTICAL ROLLS ANGLE ROLLS TUBE & PIPE BENDERS ORNAMENTAL BENDERS TANK HEAD MACHINERY HORIZONTAL PRESSES CORNER NOTCHERS REBAR BENDERS BEADING MACHINES OTHER Submit Request Send Post Office correspondence to: ​CARELL CORPORATION ​PO BOX 850, STAPLETON, AL 36578-0850 EAGLE BENDING MACHINES ​PO BOX 99, STAPLETON, AL 36578-0099

Click Image,Links or Buttons for more information 4 ROLL DOUBLE PINCH PLATE ROLLS CARELL In-Stock Specials Request-A-Quote Built Tough For Longer Machine Life VBH Series Manufacturing Range: 1' to 26' Long - .05" to 6 " thick Shown with Optional "STRADIVARI" 3D CNC Controls Q-SERIES Hydraulic & Mechanical 16GA to 5/16" Capacities BACK TO PLATE ROLLS FEATURES TECHNOLOGY CONTROLS OPTIONS Q-SERIES FEATURES Carell Plat e Rolls are built tough for longer machine life and designed to minimize maintenance. Our plate rolls are available in over 60 sizes with capacities from 16 gauge to 6 inches . Carell's range of standard models provides unmatched flexibility and coverage of most any plate rolling requirement. They can be built to handle a wide range of specific rolling requirements that includes shorter or longer lengths from 20 inches to 24 feet, custom roll cambers, slotted rolls for plate with flanges-lips-ribs, patterns for corrugated material, vertical rolling applications and more! BACK TO TOP VBH Series Full Hydraulic 4 Roll Plate Roll Manufacturing Range: 1' to 26' Long - 16 GA to 6" thick BACK TO TOP VBH Overview Almost a century of forming experience and cooperation with our customers is incorporated in our VBH 4-roll plate bending rolls. The VBH is the best machine for both, cylindrical and conical bending. The main features of our VBH rolls are the greater bottom roller pinching force (for short flat ends and optimum pre-bending) and the higher drive torque (for single pass process) to boost productivity. A winning combination for those looking for performance of the highest level Productivity - Efficiency The VBH Series plate rolls: flexible, versatile, powerful and efficient More productivity and high efficiency come standard Best process control Infinitely variable speeds,Infinitely variable pinching pressure Calibration working mode With the VBH Series we exceed your expectations. How do we exceed your expectations? It’s simple: The all-new VBH Series was created from the belief that every feature, every innovation, must be focused on helping you grow your bottom line. This led our engineers to design the next generation of plate rolls, concentrating on four key areas of machine performance: STRENGTH: Linear sliding guides and multiple bearing rolls support system. ​ POWER: High torque reduction unit for reduced number of rolling passes. ​ PRECISION: Digital control of the roll parallelism with proportional valves. CONTROLS: Infinitely variable roll adjustment speeds, Infinitely variable central lower roll pinching pressure, shell calibration working modes, extended i-diagnostic system... are only some of the features that you can control directly from the operator mobile panel, just moving a finger. VBH SERIES POWER FEATURES Discover The Exclusive Features Of The VBH Series! VBH Features BACK TO TOP 1 13 14 2 3 4 6 7 8 9 10 11 12 5 1 • Full frame design for maximum rigidity and precision 8 • Heavy-duty and rigid frame design for maximum resistance for cone rolling 2 • Machine frame with linear guides for roll sliding 3 • Heavy-duty multi-bearing system with 4 spherical roller bearings for each roll 4 • Sliding supports machined with antifriction material for maintenance free operation 5 • Rigid frame construction without force transmitted to foundation 6 • Rolls made of high resistance steel forgings, with large diameter and light cambering 7 • Digital control of the rolls parallelism with proportional valves. Precision 0.1 mm (0.004”) 9 • Heavy-duty turning bearing support, with four anti- deflection points for maximum rigidity 10 • Infinitely variable pinching pressure of the central lower roll with digital pressure gauge 1 1 • Centralized control panel, light weight design for easy handling 12 • Wired with light-cables against electromagnetic interference 13 • Instantaneous brakes for rolls rotation for maximum safety factor 14 • Fully hydraulic drive of top and lower rolls with automatic speed compensation

STANDARD AND CUSTOM TOOLING Carell manufactures tooling in-house in our CNC Machine Shop for rapid turn-around and enhanced quality control" TUBE & PIPE ROLLS Most Common Tube OD & Pipe Sizes In Stock. Hardened, Solid Tool Steel. Any Size Can be Made. Specify Smooth or Knurled. Also available in Polymer Material for Delicate Finishes. ​CUSTOM TOOLING FOR SPECIAL PROFILES We can produce special tooling for a variety of machine makes, types and models. Forward drawings of your profiles and machine information for a quote TOOLING AND SUPPORTS FOR HALF PIPES & COILS 3000 Series Machines can be equipped with tooling for producing half tubes from strip & supports for coiling. Overhead supports (man. or hydraulic) may have coil diameter & pitch adjustment or be interlocked to NC/CNC controls. TRACTION TOOLING BEAMS BENT HARD WAY Larger capacity 3000 Series Angle Rolls can be fitted with traction tooling and rolls for effective rolling of beams as well as channels bent in the X-X axis or 'Hard Way" SECTION DIES FOR PLATE ROLLS For Plate Bending Machines with extended shafts, roll sets for profiles and tube or pipe can produced. Call to discuss capacities and pricing. "V" GROOVE ROLLS Roll Bar Stock and Square Tube on a 45° angle to Create a Unique Look. Available for all Models in both Smooth and Knurled. Made of Solid, Hardened, Tool Steel here at Carell Corp. CUSTOM ROLLS We manufacture Tooling In-House To Roll a Wide Range of Custom And Special Profile Shapes in a Variety of Material Types. CAP RAIL SOLUTION A For Aluminum & Brass Cap Profiles. Three Fully Contoured Polymer Rolls. Six Steel Shoulder Plates May be Required. Call for Capacities CAP RAIL SOLUTION B The Most Economical Cap Solution. 3 Semi-Contoured, Hardened Steel Inserts to Match the Cap. Most Commonly Used With Standard Tooling. Furnished Smooth. CAP RAIL SOLUTION C Best Suited For Production Jobs. 3 Fully Contoured, Hardened Steel Rolls Built To Match Your Cap Sample. Furnished Smooth. REPLACEMENT COMPONENTS Lost a piece or need a smooth surface component for working with soft or delicate material? We stock Smooth and Knurled standard roll components for all machines. CUSTOM TOOLING Send Drawings and/or Samples For Pricing on Custom Rolls And Accessories. ​ ​ Carell also can create custom tooling for other metal bending machines such as; PARMIGIANI, COMAC, FAMAR, ICARO, MEMOLI, CBC, SIMASV and more… Carell Corporation can handle your tooling/rolling needs for aluminum extrusions, satin/polished/pre-painted finished sections, steel/brass/aluminum decorative hand rails, oversized 'U' and 'C' shapes, overwide flats, half tube production from flats, hard way beam and channel rolling to name just a few. ​

VERTICAL FORMAT 3 & 4 ROLL PLATE ROLLS Request-A-Quote Carell Provides 3 & 4 Roll Vertical Plate Rolls that are designed for combination vertical & horizontal format or dedicated vertical use only. 4 Roll-V NC Controlled 3 Roll-V w/ LED Readouts 3 Roll-V Initial Pinch Vertical Plate and Sheet Rolls can be built to suit your production needs. Vertical format rolls with no open end yoke have the drive train located at the top. If an open end yoke for material removal is required, the drive train is located at the base of the machine and a pit is generally required so working height is close to the shop floor. Vertical geometries are available in 3 or 4 Roll Double Pinch as well as 3 Roll Initial Pinch as needs dictate. For specific needs, machines can be built that operate in both the vertical and horizontal positions. The decision to adopt a vertical format rolling process must be well thought out and requires in-depth study into the methodology of the entire production process from arrival of raw materials to final shipping of the tank, tank segments or end product. Carell has the experience and expertise to partner with you and your team to determine if a vertical format machine provides advantages for your operation.

CARELL Dishing and Flanging Machines For Tank Head Forming Request-A-Quote By PARMIGIANI Parmigiani is a world leader manufacturer in the production of tank heads forming machines. Thanks to the feedback of our customers and our dedication to quality we are introducing the most advanced and powerful machines we've ever built. Parmigiani manufactures complete lines to produce dished ends for tanks and pressure vessels consisting of Hydraulic dishing presses equipped with manipulators for automatic indexing of round blanks and Flanging machines for ends with or without center-hole. Thanks to the continuous technological improvement our Dishing and Flanging machines are preferred by the world leading professional dished heads manufacturers. For More Information Call or Email Us Today! [email protected] ​

Request-A-Quote BACK BACK BACK BACK BACK BACK BACK Published Articles: "Plate Rolling Rolls On" By: Francesco Massa Advanced controls make a highly variable process more predictable. Click here for PDF Comprehensive Guide to Plate Rolling Machines "A Rundown On Rolling Machines" By: David Donnell, President, Carell Corporation The type of bending application determines the style of machine and bending capacity needed to do the job. Click here for PDF See Below for Quick References by Subject - More About Roll Forming - BACK TO TOP Plate Roll Bending Selection Guide Plate rolling is one of the most complex metal fabrication processes… Changing just one variable directly affects numerous others. Today many plate rolls have CNCs with data tables that draw from decades of rolling experience, which has made the process much more predictable. With predictability also comes automation. Some plate roll operations now have automated the loading, rolling, and unloading, producing precisely rolled workpieces time after time. QUICK LINKS Quick Links by subject: Plate Roll Manufacturers Machine Capacity Pre-Bending vs. Rolling Ratings Pre-Bending Ratings Rolling Ratings Automation Three Roll Initial Pinch Double Pinch Automatic NC or CNC Controls Variable Geometry Plate Rolls True Pyramid Machines Two Roll Machines Vertical Format Plate Rolls Optional Equipment & Accessories Cone Rolling Devices Lateral & Overhead Supports Extended Roll Shafts Roll Movement Up/Down Roll Balancing Plate roll manufacturers Plate roll manufacturers commonly rate machines according to baseline material yields between 36 to 38,000 psi. When choosing a roll you must refer to your mill delivery certificates, to your proposed supplier or to the Internet to specifically verify the average yields of the plate you need to roll. In our current manufacturing environment, the term “A36 Steel” has little correlation to the actual yield since the A36 generalization encompasses many specific sub-denominations. Some of these may have yields strengths of 70,000psi or more. The old common term “Mild Steel” will generally represent steels with yields of 45,000 to 55,000 psi. Machine capacity must be commensurate to your material yield. Most roll manufacturers can provide tables or graphs that allow you to match machine capacity to the material yield. Pre-Bending vs. Rolling Ratings will often be presented in numerous formats and tied to a minimum shell diameter at a given thickness for each Plate Roll model. The Pre-Bending operation is performed at the leading and trailing edge of the sheet (in most cases, the eventual seam). Sheets cannot physically be bent completely to the leading edge and will thus leave what is referred to as an ‘Unbent Flat’. As a rule of thumb, the minimum you should expect for an unbent flat length is 1.5 times the material thickness. This may approach 2.5 to 3.5 times the material thickness for thicker plate. It is this pre-bending operation which attempts to reduce the unbent flat to the minimum possible length which requires the most power from the machine. This operation is also very critical as care must taken to ensure that the sheet does not disengage from between the rolls. Because of this “safety factor” claims of unbent flats equal to 1.1 times the material thickness should be thoroughly investigated as it is rare that this can be achieved. Pre-bending ratings with the shortest possible unbent flats are necessarily lower than the overall rolling capacity rating for any given machine. You must be mindful when reviewing machine ratings since the maximum total rolling capacity is generally expressed with the intrinsic requirement of multiple rolling passes, longer un-bent flats and larger minimum shell diameters, even if not entirely clear from reading a simple roll specification. Un-bent flat lengths for any given sheet are a function of thickness, width, cylinder diameter, machine geometry, material yield, top roll size, operator proficiency and other factors. Rolling ratings anticipate that the plate is in motion, translating through the machine. This is called “dynamic” as opposed to the “static” pre-bending operation when the sheet is held between the rollers and one or more rolls move upward to “curl” the leading edge. Dynamic rolling mode will always allow a greater thickness to be rolled than can be bent during static pre-bending. Automation in the workplace is becoming more common as pressure increases to reduce labor costs. Most all CNC and NC controlled machines are 4 roll types. Automated controls are recommended for high volume or significantly repetitive cylinder or shell production or to roll complex shapes that are not easily reproduced by using manual machine controls. Multiple bends, variable radius bends, ovals and the like are some examples. Over automation on a roll when the production volume is not significant can be a costly mistake. Three Roll Initial Pinch or Single Initial Pinch Plate Rolls are generally for lighter capacity applications and may be electro-mechanical or hydraulic. They work by "pinching" the flat sheet between two counter-opposed rolls while the third offset roll or ‘bending roll’ moves upward to contact and then bend the sheet. When rotation of the rollers is activated, the sheet exits at a given radius. With the sheet cut to the developed length and the bending roll properly positioned; the part is rolled into a cylindrical form, where it can then be welded at the seam to produce a cylinder. The upper roll is in a fixed position; the lower pinch roll can move up/down to pinch the material. The third roll (the forming roll) is also adjustable. To remove a rolled cylinder, it must be extracted from off of the top roll. Machines are generally equipped with some type of release mechanism on the top roll to allow extraction of the cylinder. Typical methods are either a forward tilting or releasing top roll or a removable end yoke. In most applications, these machines require removal and re-insertion of the sheet in order to pre-bend both ends. They are cost effective but in contrast may be more labor intensive in a production setting. There were many large mechanical initial pinch machines built during the 1930’s, 40’s & 50’s and can be found on the used market. All have cast frames as modern alloys and welding techniques had yet to be invented. Double Pinch Plate Rolls are available from light to extremely heavy capacities and may have three or four rolls. The terminology can be confusing as these units may sometimes be referred to as ‘double pinch pyramid plate rolls’ or ‘double initial pinch plate rolls’. Both three and four roll styles have fixed position top rolls and two offset rollers or ‘lateral rolls’, one on each side. The 4 Roll styles have an additional roller directly underneath the top roll, which constantly pinches the plate during rolling. Double Pinch Rolls can pre-bend both ends of the plate without removal as is required with single pinch rolls. Three Roll machines generally require pre-bending the leading end, running the sheet through the machine to pre-bend the trailing end then switching roll rotation direction to roll the cylinder body. Four Roll Plate Rolls have a slight advantage in cycle time since t hey permit pre-bending of the leading edge, rolling the cylinder body and finishing off of the trailing edge all while rolling in the same direction. High volume products can be produced faster when using a four roll machine. Smaller machines can be mechanical but most modern machines are hydraulic and include drop end yokes for easy extraction of the work-piece. Automatic NC or CNC Controls and Four Roll Plate Rolls: Automatic cycle systems are generally used only on four roll plate rolls because there is minimal chance for slippage since the sheet is constantly pinched between the top roll and the 4th roll or “pinching roll”. Automatic controls use an encoder to track movement of the plate through the machine. If the plate slips, the bending roll movements will be out of sync with the material’s translation through the machine. Variable Geometry Three Roll Plate Rolls are not new but are gaining in popularity around the world. They are built for medium, heavy to extremely thick plate applications. The top roll moves up/down and the lower two rolls each move horizontally. This lower roll movement allows increasing the offset distance from the top roll and commensurately increasing mechanical advantage in bending. A machine of this type works well over a wide range of material thickness. By adjusting the geometry they can be used similar to single pinch, double pinch and pyramid style machines and require minimal sheet movement during the pre-bend operations. In the past these machines were commonly found in shipyards but now are being placed in general job shop and manufacturing applications. True Pyramid Machines are not generally manufactured by modern roll builders. They may be found on the used market and are more common in developing countries. They have 3 rolls, both lower rolls fixed in position with the top roll moving up/down. In general they leave very long un-bent flats and have only one or two rolls motorized in rotation. Some special application machines are still produced on a custom build basis and are mostly found in shipyards. They will have the lower two rolls spaced closely together and be of small diameter with midpoint support trunnion rollers. Two Roll Machines are designed for thin or light gauge material rolled to reasonably small diameters. They use a large diameter urethane coated pinch roller which moves up with extreme pressure against a small diameter steel top roller. A mandrel or drum, very close in OD to the desired ID of the part is fitted over the top roll. Two roll sheet rolls are extremely fast and will roll round cylinders or shells even if the blank has large cutouts, voids or holes. Since they require a mandrel for each different part diameter and material thickness they are not as versatile as some other machines. For dedicated high speed production of light gauge cylinders they can be an optimal solution. Vertical Format Plate Rolls can be of nearly any geometry, double pinch, single pinch or pyramid. Vertical rolls are most often used for rolling large diameters and can be advantageous when used in the field for storage tank production. Carell offers automated Vertical Tank Production Systems which are fed from coil stock and can include vertical sheet cutoff and automatic vertical seam welding among other options. These Systems can be used in-house or in the field and increase production output while reducing labor input Optional Equipment and Accessories are offered for most Plate Rolling Machines. The most important items to consider are hardened roll surfaces and cone rolling devices. With today’s harder materials and laser/plasma cutting techniques it is imperative to have a hardened outer surface on the rollers. Look for hardness ratings in the range of 52 to 55 Rockwell C Scale and also for the indication that the hardening process used is “induction hardening”. Hardness in the 52 to 55 RCS range will have a reasonable hardness penetration depth to provide long lasting protection against roll surface wear. Hardness exceeding 58 RCS will have a shallow penetration and a more brittle outer surface which can result in cracking or crazing. Cone rolling devices permit the operator to roll a conical shape and are standard on some machines. Some machine brands require a machine to be pre-disposed at the time of purchase if cones will be rolled in the future. This important point should not be overlooked. Lateral as well as Central Overhead Supports are optional on nearly all Double Pinch Plate Rolling Machines. Some rolls may require pre-disposition for the eventual addition of hydraulic powered supports. Overhead supports prevent lighter materials from collapsing when rolled to large diameters and must be sized according to plate thickness and shell diameter. An overhead support is not a crane and it is designed to sustain nominally only 40 to 60% of the total shell or cylinder weight. A side support can also assist in this function to prevent light materials from re-curving toward the floor if the radius is very large. Some plate rolls are designed with Extended Roll Shafts that protrude through the machine frame at the yoke end. Section or Pipe Dies can be fitted on these ‘stub’ or extended shafts. Some machines are designed with collars inside the machine frame that can be used for profile rolling but when rolling a complete 360 degree hoop it will be impossible to remove from the machine. It is also not possible to coil with inboard collars. It is not practical to anticipate rolling angle iron on a plate roll. Angle will always twist when being rolled. Plate rolls do not have outboard adjustable lateral profile guides to prevent this inherent twist. You should consider using a section rolling machine or double pinch angle roll instead for these applications. In general, section dies on plate rolls are good for bending flat bar the hard way, rods or small pipe. Roll Translation or Roll Movement Up/Down is accomplished either by using inclined linear guides or via swing arms. Direct rectilinear guides direct the thrust of the roll directly toward the top roll and have the fewest moving parts. Rectilinear guides are found on small as well as extremely high capacity rolls. Swing arm designs are not common on large machines and have more moving parts, pins, and bushings. Roll Balancing can be achieved in a variety of methods. Maintaining the bending roll or rolls parallel to the top roll is necessary in order to produce a good true cylinder. Volumetric type and electronic type balancing are the most trouble free for general job shop use. They have up to 80% fewer moving parts than swing arm balancing systems and thus significantly lower maintenance costs in the long run General Note: Roll Bending Machines are very dangerous if used carelessly. It is the responsibility of the owner to ensure the installation and proper use of point of operation safety guards or devices. Machine capacity Pre-Bending vs. Rolling Ratings Pre-bending ratings AUTOMATION Rolling ratings Three Roll Initial Pinch Double Pinch Automatic NC or CNC Controls Variable Geometry Three Roll Plate Rolls True Pyramid Machines Two Roll Machines Vertical Format Plate Rolls Optional Equipment and Accessories Cone rolling devices Lateral and Overhead Supports Extended Roll Shafts Roll Translation Roll Balancing