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 ​

BACK TO TOP VBH Controls DIGIMATIC VBH Controls BACK TO 4ROLLS Everything is under control Dedicated controls from PARMIGIANI for plate rolling cover an entire range of applications. All software is developed in-house by Parmigiani technicians with great experience in plate rolling. From the simple, compact DIGIMATIC control to the STRADIVARI (unlimited number of axis) there's a PARMIGIANI control for nearly every application. 4 LEVELS OF CONTROL ! Parmigiani NC and CNC controls are 100% developed in-house DIGIMATIC SAVE & BEND FAST STRADIVARI ​ Controls are an essential requirement for executing precision rolling applications. Select from the "DIGIMATIC" , or " SAVE & BEND" with its 10.4” display or the "FAST" with a 15” display or the "STRADIVARI" with a 19" display. Our controls function just like a tablet with touch-screens: navigating through the options is simplified via menus, shortcuts and with context-sensitive help. ® DIGIMATIC 7” full color display, touch – screen N° 6 digital read-outs, for Central Lower and Side rolls. With 2 digital read-outs for each bending roll. The operator can read exactly the inclination of the roll during conical bending. N° 1 digital read-outs, for Central Lower roll pinching pressure 7 Controlled Axis It’s possible to create different programs, saving the pinching pressure of the lower roll and the positions of Lower and Side rolls for the automatic positioning (step by step) Storage Memory Capacity: up to 500 programs of 26 steps each. BACK TO TOP SAVE&BEND FAST ® SAVE & BEND PARMIGIANI “SAVE & BEND”: NC Control type This is an entry level NC with 9 controlled axis, for fully automatic working mode. 10.4” color display, touch–screen 9 Controlled Axis (can be upgraded up to 16 axis) Two methods of programming: Editing and Play-back modes Storage Memory Capacity: up to 1000 programs of 50 steps each. BACK TO TOP ® FAST PARMIGIANI “FAST”: CNC Control type with Automatic program mode for single radius shapes: the control automatically creates the complete bending program, simply entering the shell data (radius, thickness, width, type of material), with all the sequence for obtaining the required shape. If necessary the program theoretically calculated by the control can be optimized by the operator. 15” full color display, touch – screen 9 Controlled Axis (unlimited upgradeable number of axis) Three methods of programming: Aided, Editing and Play-back modes Storage Memory Capacity: up to 5000 programs. BACK TO TOP STRADIVARI ® STRADIVARI WITH 3D ROLLCAD Discover the most advanced 3-D CNC T he " STRADIVARI" with 3D ROLLCAD on a 19" display functions just like a tablet with touch-screens: navigating through the options is simplified via menus, shortcuts and with context-sensitive help. Providing an easy-to-use operator experience. MORE ABOUT STRADIVARI BACK TO TOP

Fabricating Machinery Critical Support in Acquiring Fabricating Machinery A big fear of small businesses trying to make the leap into large-scale capital investment and fabricating machinery acquisition involves technical expertise. Folks know they need to tool up to meet the demands of larger scale markets, but they are missing the necessary expertise to know how to apply the right equipment to the needs at hand as well as what will be needed for longer-term growth. The demand for specialized knowledge continues to grow, but the availability of that skill set isn’t readily available when investments need to occur. And many small businesses find themselves having to just trust a dealer and hope for the best. With Carell Corporation, clients are served from beginning to ownership and afterwards with support, technical guidance, training and follow up for a long-term relationship, not a quick sale and dislocation. Carell clients are matched to the equipment that best serves their needs now and within the scope of their business growth because Carell Corporation focuses on customer satisfaction first. ​ ​ We manufacture and stock tools for plate roll bending, angle rolls, tube & pipe benders, custom & special tooling, section benders and more. We also carry the following brand names - Acrotech, Air Liquid, Cansa Makina, BPR Curvatrici, CBC, Comac, Hyllus, Icaro, Isitan, Lucas, Macri, Memoli, Ofmer, OMCCA, Omera, Parmigiani, Pedrick, Sahinler, and Simasv.

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. ​

REBAR BENDERS & SHEARS True Mobility • Rugged Frames & Low Maintenanc e The Best Solution For Your Rebar Fabricating Requirements! CARELL In-Stock Specials Request-A-Quote Rebar Benders & Cutters from Heavy Production to Economical uni ts. We offer Combination Benders with Shears, Benders, Portable Bar Shears, Stirrup Benders, Spiral Applications, Optional Tables & Tooling for your production. BENDER & SHEAR COMBOS REBAR BENDERS PORTABLE YARD SHEARS STIRRUP BENDERS Scroll Down to Click Images & Links for descriptions of standard equipment, options & technical specifications BACK TO TOP TP-SERIES COMBO REBAR BENDERS W/SHEARS Cutting and Bending in One Machine! CARELL In-Stock Specials Request-A-Quote BACK TO TOP Each TP-Series Rebar Bender & Shearing station produces quality bends swiftly and efficiently to your desired degree with electric limit stops . TP Series Benders have a mechanical bar shear on board with an adjustable backstop , safety guard and E-Stop . Standard with 6 BEND programmable repeat memory digital controls STANDARD FEATURES: • Automatic Hands Free Operation: Bending sequence can be controlled by foot pedal switch & E-Stop Pins . • Heavy Duty Work Head: Solid steel top rotary plate mounted in a heavy-duty welded steel base frame. • Forward & Reverse Controls: Standard controls allow clockwise/counterclockwise operation. • Bends up to 360 Degrees in one pass operation. • Quick Change Tooling: Simple spindle design allows for tooling changes in seconds! • Shears: Built on a heavy cast frame the speed reducer assembly includes interchangeable multi-sided blades, a safety shield and E-Stop. Shear cycles with bend rotation. • Portable: Equipped with 4 large casters for ease of mobility. • Electrical System: Switchgear consist of a Main fuse group, low voltage controls, motor overload protection, reversing low voltage relays and main power switch with indicator lamp. • 24VAC Low Voltage Controls • Safety Protection: Equipped with shield, emergency stop palm switch & limit cut-out • Tooling: Includes one set of counter pins, main arbor pin, squaring/checking block, tool tray and instruction manual. All tooling is heat treated for durability. COMBO BENDER/SHEAR REBAR BENDER P-SERIES REBAR BENDERS Versatile High-P erformance Rebar Bending "Made to Build" CARELL In-Stock Specials Request-A-Quote BACK TO TOP Spiral Tooling Large Radius Arm Angle Control Long Saddles Our P-Series Rebar Benders use a rotating head with a forming arbor and lateral pins around which the bar is bent. Quality bends are produced swiftly and efficiently to the desired degree with electric limit stops . Rotation powered via TEFC electric motor and a continuous oil bath speed-reduction unit . Safety guards and stop switches are standard. STANDARD FEATURES: • Automatic hands free opera tion: Be nding sequence can be operated by foot pedal switch with E-Stop Pins . • Heavy Duty Work Head: Solid steel top rotary plate mounted in a heavy-duty welded steel base . • Forward & Reverse Controls: S tandard controls allow clockwise/counterclockwise operation. • Bends up to 360 Degrees in one pass operation. • Quick Change Tooling: Simple spindle design allows for tooling changes in seconds ! • Portable: Equipped with 4 large casters for ease of mobility. • Electric al System: Switchgear consist of a Main fuse group, low voltage controls, motor overload protection, reversing low voltage relays and main power switch with indicator lamp. • 24VAC Low Voltage Controls • Safety Protection: Equipped with safety shield and emergency stop palm switch. • Tooling: Includes one set of counter pins, main arbor pin, squaring/checking block, tool tray and i nstruction manual. All tooling is heat treated for durability. C-SERIES REBAR YARD SHEARS Your Choice of 6 Models " Designed For Job Site Use" CARELL In-Stock Specials Request-A-Quote BACK TO TOP Our C- Series Rebar Shears are designed for job site use and abuse as primary criteria. Every machine is equipped with three speed reduction sections for maximum cutting power with minimal energy usage. Units use TEFC electric motors, are equipped with foot pedal and manual controls for maximum versatility. Each comes with wheels, safety covers and guards. STANDARD FEATURES: • Powered Operation: Units powered by TEFC electric motors for swift cutting/shearing • Extra Heavy Frame: Frame and reduction unit are in heavy steel plate & castings • Controls: Shear actuation is via foot pedal and/or manual lever for • Quick Change Blades: Each blade has 8 cutting sides and are easily changed • Single Speed operation with continuous oil bath heavy-duty reduction unit • Portable Unit with Wheels: Every unit equipped with 2 large wheels for Mobility! • Electrical System: Equipped with a magnetic motor shutoff for motor overload protection. • Safety Protection: Top shield covers shear area including limit switch, anti-repeat lock & overload protection. YARD SHEARS ST-SERIES REBAR STIRRUP BENDERS Easy to Transport, Compact Design with Removable Legs CARELL In-Stock Specials Request-A-Quote BACK TO TOP Our ST-16 Stirrup Bender is designed to rapidly bend stirrups and ties to the desired degree using electric limit stops. Safety guard and Emergency stops are standard STANDARD FEATURES: • Heavy Duty Work Head: Solid steel top rotary plate mounted in a heavy-duty welded steel base . • Removable L egs for easy transport . • Bends up to 270 Degrees in one pass operation, includes rotation inversion switch • Quick Change Tooling: Simple spindle design allows for tooling changes in seconds! • Electrical System: Main fuses, low voltage controls 24 VAC, motor overloads and reversing contactors, main switch & E-Stop. • Safety Protection: Equipped with emergency stop palm switch and limit cut-out • Standard: Instruction manual, one set of counter pins, main arbor pin, arbor sleeves, remote foot pedal, length stop and squaring arm/checking block. STIRRUP BENDER PS-SERIES REBAR STIRRUP BENDERS Digital Control with Program Memory For Up To 20 Bend Angles CARELL In-Stock Specials Request-A-Quote BACK TO TOP PS-Series includes digital bend angle control and full base cabinet. It is designed for automatic pre-set bending of each step in the program. STANDARD FEATURES: • Heavy Duty Work Head: Solid steel top rotary plate mounted in a heavy-duty welded steel base . • Portable Unit: Every unit equipped with 4 large casters for ease of mobility. • Bends up to 270 Degrees in one pass operation, includes rotation inversion switch • Quick Change Tooling: Simple spindle design allows for tooling changes in seconds! • Electrical System: Main fuses, low voltage controls 24 VAC, motor overloads and reversing contactors, main switch & E-Stop. • Safety Protection: Equipped with emergency stop palm switch and limit cut-out • Standard: Instruction manual, one set of counter pins, main arbor pin, arbor sleeves, remote foot pedal, length stop and squaring arm/checking block. PS16 Stirrup Bender

BACK TO TOP CORNER NOTCHING MACHINES Request-A-Quote Carell / SIMASV Hydraulic Corner Notching Machines use a patented self regulating gap adjustment which permits perfect shearing of both thin and thick materials without need of operator intervention. Machines are heavy duty and the work bed is constructed of GS500 Cast Alloy, precision machined and stress relieved. Lower frame is constructed of heavy steel tube and sheet. Several styles are available: AF - Fixed Angle, AF/P - Fixed Angle with Punch, AV - Variable Angle and AV/PA Variable Angle with Punch Units are capable of cutting from the apex of the notch or from the end. The machine bed is machined with dovetail slots to accept squaring arms, spring loaded sheet stops, side extensions or other accessories. Graduated reference scales are recessed in the bed. Vertical stroke tolerance is maintained by using two precision ground and hardened guideposts working through a heavy, oversized cast head structure. Head is also slotted to accept spring loaded optional sheet hold-downs. Each machine is furnished with a pair of blades, a pair of adjustable sheet squares, stroke limit adjustment, waste chute, foot pedal, service tool kit and instruction manual. A wide variety of optional equipment is available. All units are 3 phase and voltage must be specified on ordering. NEW! AV226/PA-CNC NOTCHER Extraordinary cutting precision equal to 0.1 ° Automation is often the answer to accelerating production. For this, S.I.M.A.S.V. has added NC capabilities to a variety of its models. For example, their latest innovation is the 30 ° >140 ° variable-angle hydraulic notching machine AV226/PA-CNC. It has been designed with system-regulating blades by means of an NC electronic control integrated to the machine. This notcher was in fact designed to meet the strict accuracy requirement of the customer European Space Research & Technology Center – ESTEC The AV226/PA-CNC model distinguishes itself from the other notchers in the market because its blades are moved singularly and controlled by an electronic NC. Thanks to this system, the machine achieves an extraordinary cutting precision equal to 0.1 ° A wide range of optional and customized equipment enhances the extensive standard equipment of the machine AF/B Fixed Angle AF 226/B Notching 0.220 Capacity + 8.66 Blades + 90° Angle AF 226/B Notching 0.300 Capacity + 8.66 Blades + 90° Angle AF/P Fixed Angle with Punch Notching 0.300 Capacity + 9.84 Blades + 90° Angle Punching 1.125 x 11Ga BACK TO TOP AV/B Variable Angle AV 224/B Notching 10 Ga Capacity + 8.66 Blades + 30° to 140° Angle AV 226/B Notching 0.220 Capacity + 8.66 Blades + 30° to 140° Angle AV/PA Variable Angle with Punch AV 224/PA Notching 10Ga Capacity + 8.66 Blades + 30° to 140° Angle Punching 1.125 x 12Ga AV 226/PA Notching 0.220 Capacity + 8.66 Blades+ 30° to 140° Angle Punching 1.125 x 11Ga LC & AV Series Several Models with capacity up to 3/8 Plate, call for Information ​ BACK TO TOP

Innovation, Quality & Performance Backed By Decades Of Experience 251-937-0947 Career Opportunities Click The Image Link Above To See The Available Job Opportunities At Carell Corporation & Eagle Bending Machines, Inc.

BACK TO TOP The Powerful and Reliable Choice Full Frame Extended Design Parmigiani plate rolls have the most heavily sized frame you can find in the market. Unlikely slim frames covered with thin thickness plates that you can find on all machines in the market, makes our frame design look definitively oversized.The exclusive full frame design withstands all bending forces and guarantees stiffness and performance throughout years of service.This unique machine frame, with extended design for added rigidity and strength, are welded fabrication. After welding all frames are stress relieved and then machined on CNC milling machines Get more with our linear guide s ALG System (Anti-friction Linear Guides) • No friction - less than swing design • Direct load to the plate • Less vertical power on top roll • Lower bending diameter The linear guide design is the only system that can grant the necessary machine stiffness and the perfect geometry for all kind of bending operations. The linear design allows a compact geometry of the machine ("minimum centerline distance between the two side rolls", impossible to obtain with the swinging design) that is essential for bending precision and accuracy. The linear design allows you to work in the best and ideal geometrical conditions when rolling high yield strength materials, reducing the shell spring back reopening effect and obtain a much smaller bending diameter when compared with the swinging design • Heavy Duty HMB Exclusive Design • Supports Cone Rolling • Permanent Lubrication Built for Heavy Work HMB System Heavy Multiple Bearings More power - More torque HTT System (High transmitted torque) Each bending roll is supported by 4 heavy-duty self-aligning spherical roller bearings (double raw type). Each bearing is oversized in order to withstand the whole bending load. Thanks to the HMB exclusive design, with four oversized bearings fitted into a swiveling housing, the roll can freely deflects along it’s full width during the rolling process. This guarantees an optimal distribution of the load on the supports even during the cone rolling process and increases the machine's reliability and life. Moreover, the multi bearing system with swiveling housing design greatly reduces the maintenance and the need for lubrication (permanent lubrication). Friction free - Maintenance free AST System Anti-friction sliding technology Each Rolls support is machined with anti-friction material in the sliding area. This system drastically reduces the maintenance and sliding friction, less than in a planetary machine. The rolls driving is realized by independent hydraulic motors via planetary gear transmission directly coupled to each driven roll. The independent rolls hydraulic drive assures and automatic speed compensation between the top and lower rolls and an optimal distribution of the torque on each roll during the working phase. The HTT system allows the best plate feeding and the highest driving torque of any competitive machine. A winning combination for those looking for performance of the highest level. VBH Options BACK TO TOP Great Options and Accessorie s Our Parmigiani VBH has a standard package of features that usually are not available even as options in other machines (like our FACILE, i-Diagnostic, calibration working mode, Servo-dynamic Active Control with infinitely variable positioning speeds of the bending rolls and active pressure control of the lower roll...) our R & D department has designed a wide range of accessories for special bending applications, like the Hydraulic cambering device for central lower roll with variable intensity for working with thin and long plates, gantry loaders, unloading devices etc. in order to increase productivity and quality of finish for special materials. OPTIONS

Horizontal Presses A Wide Selection of Horizontal Presses Carell Corporation makes it easy for clients and fabricators to secure the right horizontal presses for the jobs that need to be met. With a selection of presses that range from small footprint to extra wide capabilities, the Carell T-series horizontal presses make it easy for fabricators to handle custom jobs without difficulty. All of the T-series presses incorporated forced lubrication with multiple tooling choices as well as accessories for added functionality. Straightening, bending, curling, rotary pipe modification, die cutting, shearing, twisting and form pressing are all doable. With all these added tooling options, a fabricator can easily create a wide range of metal hardware products with very little effort and cost aside from materials and system press maintenance. In fact, one could argue that Carell’s horizontal press equipment may almost be only limited by an owner’s imagination of what can be manufactured. We manufacture and stock tools for plate roll bending, angle rolls, tube & pipe benders, custom & special tooling, section benders and more. We also carry the following brand names - Acrotech, Air Liquid, Cansa Makina, BPR Curvatrici, CBC, Comac, Hyllus, Icaro, Isitan, Lucas, Macri, Memoli, Ofmer, OMCCA, Omera, Parmigiani, Pedrick, Sahinler, and Simasv.

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

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