Unmatched capacity. Superlative precision. Optimal turnout.
Our top-of-the-art 4-Rolls Sheet Metal Bending Machine are accessible and energy efficient. Ensure the steel plate bending work of peace of mind and convenient operation. KRRASS’s linear guided machine tools provide multiple benefits to your manufacturing infrastructure: efficient and long-lasting performance, unmatched edge bending accuracy, reduced capital expenditure, and reduced ongoing operating and maintenance costs.
ADVANTAGES OF
Roll Movement in Four Roll Design
These Plate Bending Machines have four rolls and liner guidance for the side rolls.
The Top roll remains fixed, the bottom roll moves vertically, and the two side rolls move in liner guide way to form the shell.
The top and bottom rolls are power driven by planetary gearboxes with hydraulic motors.
Thin Plates need closely spaced rolls to avoid driving slippage.
Location of the bottom roll directly below the top roll ensures very good grip on such jobs.
Due to the high productivity of low thickness shells, the four roll machines prove to be an attractive investment for mass production of pipes and shells.
Over and above the cones, other non-circular shapes like oil tankers & elliptical shells can be made.
This type of roll configuration also facilitates CNC operation.
20-30% higher Investment for the same thickness capacity and span compared to similar three roll machine.
16,000 square meters of manufacturing facility in Nanjing, China’s Engineering Hub that strategically allows us easy access to infrastructure facilities like transport, raw materials, skilled workforce, power supply etc.
Our manufacturing excellence is underpinned by continuous product development. We have been leading the industry since over 40 years in design, build quality, performance and value for money. All our designs have been developed in-house and are fully supported by us.
We have manufactured and commissioned over 2500 machines across China and overseas. The first machine we ever sold is still in operation and is proudly supported by us.
We enjoy loyalty of over 400 delighted clients. Beyond excellent performance of our machines, they also enjoy our on-demand service and our ever-ready inventory of a full set of spares for all machines we manufacture.
Enjoy the peace of mind that you are in good hands.
| Model | Max Bending Thickness (mm) | Pre-bending Thickness (mm) | Roller Working Length (mm) | Plate Yeild Limit (Mpa) | Top Roller Diameter (mm) | Bottom Roller Diameter (mm) | Side Roller Diameter (mm) | Main Power (Kw) | Length*Width*Height (L*W*H) (mm) | Weight (Kg) |
|---|---|---|---|---|---|---|---|---|---|---|
| W12-4x2000 | 4 | 3.5 | 2050 | 245 | 160 | 140 | 120 | 3 | 4600*1100*1100 | 4300 |
| W12-4x2500 | 4 | 3.5 | 2550 | 245 | 190 | 170 | 150 | 4 | 5150*1300*1400 | 5000 |
| W12-4x3000 | 4 | 3.5 | 3100 | 245 | 210 | 190 | 170 | 5.5 | 5650*1420*1400 | 6300 |
| W12-6x2000 | 6 | 5 | 2050 | 245 | 190 | 170 | 150 | 4 | 4650*1300*1400 | 4800 |
| W12-6x2500 | 6 | 5 | 2550 | 245 | 210 | 190 | 170 | 5.5 | 5150*1420*1400 | 5800 |
| W12-6x3000 | 6 | 5 | 3100 | 245 | 230 | 210 | 190 | 7.5 | 5860*1430*1400 | 7000 |
| W12-8x2000 | 8 | 6.5 | 2050 | 245 | 210 | 190 | 170 | 5.5 | 4650*1420*1400 | 5600 |
| W12-8x2500 | 8 | 6.5 | 2550 | 245 | 230 | 210 | 190 | 7.5 | 5250*1500*1400 | 6300 |
| W12-8x3000 | 8 | 6.5 | 3100 | 245 | 270 | 250 | 210 | 11 | 5750*2130*2000 | 9500 |
| W12-10x2000 | 10 | 8 | 2050 | 245 | 230 | 210 | 190 | 7.5 | 4700*1420*1400 | 5800 |
| W12-10x2500 | 10 | 8 | 2550 | 245 | 270 | 250 | 210 | 11 | 5270*1420*1400 | 6500 |
| W12-10x3000 | 10 | 8 | 3100 | 245 | 300 | 270 | 220 | 11 | 5700*1500*1500 | 8800 |
| W12-12x2000 | 12 | 10 | 2050 | 245 | 270 | 250 | 210 | 11 | 4770*1520*2130 | 6500 |
| W12-12x2500 | 12 | 10 | 2550 | 245 | 300 | 270 | 220 | 11 | 5200*1500*1500 | 8200 |
| W12-12x3000 | 12 | 10 | 3100 | 245 | 330 | 300 | 240 | 11 | 5770*1900*1880 | 13500 |
| W12-16x2000 | 16 | 13 | 2050 | 245 | 300 | 270 | 220 | 11 | 4700*1500*1500 | 7500 |
| W12-16x2500 | 16 | 13 | 2550 | 245 | 330 | 300 | 240 | 11 | 5550*1840*1820 | 12000 |
| W12-16x3000 | 16 | 13 | 3100 | 245 | 360 | 330 | 250 | 15 | 6300*2000*2050 | 17000 |
| W12-20x2000 | 20 | 16 | 2050 | 245 | 330 | 300 | 240 | 11 | 4700*1900*2000 | 12000 |
| W12-20x2500 | 20 | 16 | 2550 | 245 | 360 | 330 | 250 | 15 | 5800*2000*2050 | 15000 |
| W12-20x3000 | 20 | 16 | 3100 | 245 | 390 | 360 | 300 | 18.5 | 6500*2250*2550 | 23000 |
| W12-25x2000 | 25 | 20 | 2050 | 245 | 360 | 330 | 250 | 15 | 5300*2000*2050 | 14000 |
| W12-25x2500 | 25 | 20 | 2550 | 245 | 390 | 360 | 300 | 18.5 | 6250*2160*2350 | 22500 |
| W12-25x3000 | 25 | 20 | 3100 | 245 | 430 | 390 | 330 | 22 | 7000*2300*2500 | 30000 |
| W12-30x2000 | 30 | 25 | 2050 | 245 | 390 | 360 | 300 | 18.5 | 5000*2160*2350 | 21000 |
| W12-30x2500 | 30 | 25 | 2550 | 245 | 430 | 390 | 330 | 22 | 6500*2300*2500 | 27000 |
| W12-30x3000 | 30 | 25 | 3100 | 245 | 460 | 420 | 360 | 30 | 7300*2600*2700 | 33000 |
| W12-35x2000 | 35 | 28 | 2050 | 245 | 430 | 390 | 330 | 22 | 6000*2300*2500 | 25000 |
| W12-35x2500 | 35 | 28 | 2550 | 245 | 460 | 420 | 360 | 30 | 6800*2600*2700 | 31000 |
| W12-35x3000 | 35 | 28 | 3100 | 245 | 510 | 460 | 390 | 37 | 7600*2800*2900 | 38500 |
| W12-40x2000 | 40 | 32 | 2050 | 245 | 460 | 420 | 360 | 30 | 6300*2600*2700 | 29000 |
| W12-40x2500 | 40 | 32 | 2550 | 245 | 510 | 460 | 390 | 37 | 7100*2800*2900 | 35000 |
| W12-40x3000 | 40 | 32 | 3100 | 245 | 550 | 510 | 420 | 45 | 8000*3100*3200 | 45000 |
| W12-45x2000 | 45 | 36 | 2050 | 245 | 510 | 460 | 390 | 37 | 6600*2800*2900 | 33500 |
| W12-45x2500 | 45 | 36 | 2550 | 245 | 550 | 510 | 420 | 45 | 7500*3100*3200 | 42000 |
| W12-50x2000 | 50 | 40 | 2050 | 245 | 550 | 510 | 420 | 45 | 7000*3100*3200 | 38000 |
| W12-50x3000 | 50 | 40 | 3100 | 245 | 610 | 560 | 480 | 55 | 8800*3600*3800 | 65000 |
| W12-60x3000 | 60 | 48 | 3100 | 245 | 670 | 620 | 520 | 75 | 10000*4300*4600 | 90000 |
* All Sizes in mm.
* All capacities are as per 260 MPA.
We offer machines with fixed and variable speeds according to your application and feed requirements.
KRRASSs’s sheet metal plate bending machine have a strong steel structure made from heavy metal plates. These frames are connected through a sturdy box design chassis and are equipped with interlocking and stiffening ribs. Rolling guides are machined together utilizing a single fixed reference point, which allows for parallel of all shafts and precision surfaces, as well as the machine’s life and critical precision characteristics.
The rolls are the most important elements of our sheet metal plate bending machine. KRRASS designed the optimum diameter roll and used a forged carbon steel roll machined with a high-precision CNC lathe. Our rollers have a unique spline-based design, which effectively connects the rollers with the planetary gear system. This design reduces roll failure points compared to welded connections offered by other manufacturers.
Our rolls are crowned to compensate for roll deflection during the bending process. Custom crown-machined rolls for different materials or thickness can be selected when ordering.
Additional energy saving is ensured in our 4-Rolls sheet metal plate bending machine by a hydraulic system which can work at less than full capacity when jobs less than maximum thickness are rolled.
KRRASS Planetary driving system ™ used in our machines is efficient and eliminates energy wastage associated with heavy-transmission systems and yet achieves the goal of speed reduction by increasing the stages in gears and pinions.
Pre-Pinching (Pre-Bending)
Edge bending can be done before or after shell rolling depending on operator skill and choice. Thin plates can be rolled and edge-bent in a single pass.
The cone bending process with the W12 series is simple. The bottom rolls need to be inclined to achieve cone bending geometry. This is controlled and monitored by electronic microprocessor (on some models).
Our control system also ensures easy and accurate return to parallel setting after cone bending resulting into precision on repetitive jobs.
State-of-the-art in forming cylinders and cones.
Easy to install, extremely user-friendly and convenient to service.
Simple to learn and operate. No extensive operator training required.
Robust construction reduces wear & tear.
Readily available spare parts.
Tropicalized oil cooling system ensures non-stop operations in hot working conditions.
Easy to understand hydraulic and electrical system reduce unwanted down time.
Other than cylinders and cones, other non-circular shapes like oil tankers and elliptical shells can be made using a PLC version.
Due to the exceptional build quality, failure-resistant linear guideway design, high operational precision, and a wide range of jobs that can accurately rolled, the F series machines prove to be the most attractive investment for any type of industry, regular production or a job shop.
Due to a variety of accessories that are available to enhance the machine capability, the investment is justified in more than one way. The energy saving features and negligible maintenance cost also promise a low running cost.
Alongside our excellent design and build quality, we provide the following additional features and accessories upon request from our client.
1
Surface-Hardened Rolls
Induction Hardened Rolls having Surface Hardness between 42 to 55 HRC for additional durability and longevity.
2
Complete Windmill Tower Manufacturing Package
Including central and side shell support, tilting conveyors, hardened rolls and PLC/CNC capabilities
3
Central & Side Shell Supports
Central & side shell supports provide ease of operation, operational cost saving and productivity while increasing safety of workers.
4
Hard Chrome Plated Rolls
Hard chrome plated rolls for special applications in Pharma and Dairy Industry.
5
Tilting Table
Tilting tables for support while feeding plates at specific angles. Specially useful for plates of larger lengths.
6
Conveyors
Powered Conveyors that provide ease of plate feeding in case of longer plate lengths, improved machine performance and longevity.
7
PLC Control
PLC Controllers provide precision, ease of operation, while identifying needs for preventive maintenance to increase machine life and optimize productivity.
All rolls are crowned (cambering) for compensating deflection.
Top roll is counter balanced automatically once the drop end is opened without any jacks or manual arrangement.
DRO (Digital Readout) is housed on the operating console which gives the position of the bottom rolls with respect to the top roll.
Cones can be bent up to the edge-bending capacity of the machine. The bottom rolls can be inclined for the required cone angle.
Some of the electrical bough outs are IP 55 like motors, switchgears etc. The electrical cabinet will be manufactured as per our standard practices and will meet IP 55 protection.
Forward and reverse to the main drive is provided. The bottom rolls can be moved up and down individually.
Hydraulic oil – Enklo 68 Planetary Gear box – EP 90
Operating console houses push buttons for all the operations of the machine. The console is movable so that the operator can keep it at any desired location.
Although the standard machine is not meant for hot rolling, occasional hot rolling can be done (a few jobs per month) provided that suitable precautions are taken.
A. Divide the Actual YP by 26. Find square root of this number. Multiply this value by actual plate thickness to get effective thickness.
Reviewed by 17 users
This plate bender has exceeded our expectations and consistently delivered high-quality bends without any issues.
Ho comprato un winder piatto W12 e ho lavorato molto bene.
Many thanks, for KRRASS’ kind answers and helpfull approach. From starting purchase an to delivery, any time they were very kind. The CNC 4-Roller Rolling Machine W12-8×2000 is very high quality
Many thanks, for your kind answers and helpfull approach. From starting purchase an to delivery , any time they were very kind. The W12-4-rolls sheet metal plate bending machine is very high quality.
Прокатный станок W12-8×2000 мм – отличный станок. Сотрудничество было очень приятным, и я с нетерпением жду следующего сотрудничества.
This machine is incredibly versatile, and can handle a wide range of thicknesses,I’ve used it to roll thin aluminum sheets to thick steel plates
Tento stroj je neuvěřitelně robustní a odolný, takže je ideální pro průmyslové použití. Byl jsem ohromen, jak snadno se používá a jak rychle dokáže tvarovat kovové desky do křivek a válcových tvarů. Válečky jsou vyrobeny z kvalitních materiálů, které zajišťují dlouhou životnost stroje. Pokud hledáte stroj na válcování plechů, velmi bych vám doporučil čtyřválečkový hydraulický stroj na válcování plechů KRRASS W12.
Diese Maschine ist unglaublich robust und langlebig, wodurch sie perfekt für den industriellen Einsatz geeignet ist. Ich war beeindruckt, wie einfach es zu bedienen war und wie schnell es in der Lage war, Metallplatten in Kurven und zylindrische Formen zu formen. Die Rollen sind aus hochwertigen Materialien gefertigt, die dafür sorgen, dass die Maschine lange hält. Wenn Sie auf dem Markt für eine Blechwalzmaschine sind, würde ich die KRRASS W12 Vierwalzmaschine für hydraulische Blechwalzmaschine wärmstens empfehlen.
Je travaille dans l’industrie du formage des métaux et j’ai récemment acheté la machine de laminage hydraulique de tôle à quatre rouleaux krrass W12 de cette société. Je dois dire que cela a dépassé mes attentes.
Стальной прокатный станок KRRASS является ценным активом для любой промышленной металлообработки. Его долговечность, удобный интерфейс и высококачественный выход делают его первоклассным выбором. Я настоятельно рекомендую эту машину всем профессионалам, которые нуждаются в точном и эффективном формовании металлических пластин.