The plate rolling machine is also known as a plate bending machine and plate roller. It is a type of sheet metal bending equipment that utilizes work rollers to produce sheet metal round processing and forming. It can form parts of different shapes such as cylindrical parts and conical parts. It is a piece of very important sheet metal bending processing equipment.Definition of Plate Rolling Machine
A plate rolling machine is designed to shape various metal sheets into rounded or conical forms. Its serve as the perfect tool for pre-bending and rolling metal sheets.
The plate bending machines are essential for fabricating rounded components used in oil and gas rigs, tunnel supports, boiler equipment, pressure vessels, heat exchangers, and more.
At the forefront of innovation, BIT specialize in 3-roll or 4-roll bending machines for plate rolling, actively advancing technology to meet future demands and exceeding the expectations of industry-leading clients. The plate rolling machines drive production across diverse sectors, including construction, transportation & logistics, energy production, machinery manufacturing, and beyond.
In China, BIT&#;re reputed and continously prove to develop and produce the market&#;s strongest Plate roller (Plate Rolling Machines).
Plate rolling machines can be divided into two-roller, three-roller, and four-roller. The three-roll plate rolling machine can be divided into two types: symmetrical and asymmetrical.
Introduction and working principle 2-roll plate rolling machine 2 Roll Bolling MachineThe 2-roll plate rolling machine is a type of equipment that boasts two rollers, an upper rigid metal roller, and the lower elastic roller. The sheet material is passed in between the rollers, and when force is applied, the metal adheres to the power assuming a cylindrical shape. Used on thin metals for high production operations (filters, canisters, etc.)
The 2-roll plate rolling machine is configured with polyurethane roll which, by exerting dynamic pressure, speeds up the plate forming process, assuring the straight end of the produced rolls is removed and greatly simplifying the prebending-rolling-prebending sequences typical of 3-roll or 4-roll steel plate rolling machines.
Working principle of 3-roll and 4-roll plate rolling machineThe working principle of the plate rolling machine is the same as that of the profile bending machine according to the principle of three points forming a circle, the relative position change and rotational motion of the workpiece are used to produce continuous plastic deformation of the plate to obtain a workpiece with a predetermined shape. According to the rotational movement and position changes of work rolls of different shapes, elliptical parts, arc parts, cylindrical parts, and other parts can be processed.
Static pre-bending and Dynamic bendingStatic pre-bending and dynamic bending are two distinct methods used in plate bending processes.
Static pre-bending involves holding the metal sheet stationary while a roll ascends along the sheet, bending the leading edge. This method is characterized by the sheet being held in place during the bending operation.
In contrast, dynamic bending entails the plate or sheet being in motion as it runs through the bending machine. The continuous motion of the sheet facilitates a more efficient operation of the machine, leading to increased bending thickness capability.
Dynamic bending offers advantages in efficiency and productivity, as the continuous motion of the sheet allows for faster processing and potentially thicker materials to be bent compared to static pre-bending.
Both methods have their respective applications and are chosen based on factors such as material type, thickness, and desired bend characteristics. Dynamic bending is often preferred in high-volume production environments where speed and efficiency are crucial, while static pre-bending may be suitable for precision bending applications requiring careful control over the bending process.
Working Principle of Symmetrical 3-roll Plate Rolling Machine Figure 7-1 Working principle of plate bending machine: a: symmetric 3-roller plate bending machine; b: asymmetric 3-roller plate bending machine; c: 4-roll plate bending machineThe picture above (a) is a cross-sectional view of the rollers of a symmetrical 3-roll bending machine. The rollers have a certain length in the axial direction so that the entire width of the sheet is bent.
There is an upper roller 1 at a symmetrical position in the middle of the two lower rollers. The upper roller can be adjusted in the vertical direction so that the sheet material 4 placed between the upper and lower rollers can obtain different bending radii. The lower roller 2 is active and is installed in a fixed bearing. The motor rotates in the same direction and at the same speed through a gear reducer. The upper roller is passive and installed in a bearing that can move up and down. The adjustment of the rollers on the large plate rolling machine is mechanical or hydraulic, and manual adjustment is often used in the small plate rolling machine.
Variable-geometry 3 Roll Bending MachineWhen working, the sheet material is placed between the upper and lower rollers, and the upper roller is pressed down to make the sheet material bend between the support points. When the two lower rollers rotate, the sheet material moves due to the action of friction, so that the entire sheet material is evenly bent.
According to the above bending principle, the required bending radius can only be achieved when the part of the sheet material is in contact with the upper roller, so the edges of both ends of the sheet have a length that does not contact the upper roller and does not bend, which is called The remaining straight side, the length of the remaining straight side is about half of the distance between the two lower rollers.
Variable-geometry 3 Roll Bending Machines working principle of variable geometry 3 roll plate bending machineVariable-geometry 3-roll bending machines offer unparalleled versatility, allowing for the widest range of material types and thicknesses relative to the size of the top roll. These machines excel in medium and thick plate bending applications.
The operational principle of the three-roll variable pitch involves all three rolls being capable of movement and tilt. While the top roll operates in the vertical plane, the side rolls move horizontally. During the rolling process, the top roll applies pressure to the metal plate between the two side rolls. The variability of the three-roll design enables the rolling of various thicknesses and diameters of cylinders. Such machines feature one pressing top roll and two pressing side rolls.
The horizontal movement of the side rolls ensures the plate remains in a horizontal position, facilitating quick and efficient pre-bending execution. The configuration of the three rolls, with the top roll moving along the vertical axis and the two lower rolls moving along the horizontal axis, allows for independent adjustment of the center distance of the top bending roll with each lower roll. Consequently, by reducing the distance between the lower rolls and applying pressure with the top roll on the initial part of the plate, the straight portion can be minimized, achieving perfect pre-bending.
Expanding the center distance of the lower rolls significantly enhances the rolling capacity. In the 3-roll variable geometry plate bending machine, the top roll is motorized, while the two lower rolls are free, equipped with an automatic braking system ensuring high reliability. Additionally, the machine can be outfitted with three driving rolls for bending thinner plates. Roll parallelism is meticulously controlled and managed by a PLC, guaranteeing maximum precision in roll positioning with minimal tolerances.
For instance, the side rolls play a crucial role in generating mechanical advantage. Adjusting the side rolls allows for varying degrees of mechanical advantage. When the side rolls are fully open, the machine achieves maximum mechanical advantage, while closing them reduces this advantage. Thus, a machine capable of rolling 2-inch-thick material with maximum mechanical advantage can handle jobs as thin as 1/2 inch by reducing the mechanical advantage accordingly. Furthermore, the independent axis of each roll contributes to achieving a perfect bend. The back-side roll, situated at the far side of the feeding point, serves as a back-gauge, ensuring proper plate alignment and eliminating the need for operator assistance.
Double-pinch 3 Roll Bending Machine Working Principle of Double-pinch 3-Roll Bending MachineDouble-pinch 3 roll bending machines are available in a range of capacities, from light to very heavy, offering significant advantages over three-roll initial-pinch machines. Unlike initial-pinch 3-roll bending machines, they eliminate the need for operators to remove, flip, and then attempt to square the plate a second time after pre-bending. This is because cylinders can be rolled to the required diameter immediately after pre-bending, as the material can be kept within the machine&#;a feature not possible in initial-pinch 3-roll bending machines.
In a plate bending machine, the side rolls are positioned to the right and left of the top roll and share the same axis, contributing to the bending process. Additionally, the back-side roll serves as a back-gauge to square the plate for proper alignment, eliminating the need for manual assistance.
For cone rolling on a double-pinch 3 roll bending machine, the side rolls can be tilted to establish the desired cone angle, providing versatility in shaping.
When pre-bending on a 3 roll plate rolling machine, plates are tilted down as they are fed. In contrast, on a four-roll machine, plates are loaded horizontally at the feed level, allowing the use of horizontal motorized roller tables to aid in feeding the plate.
Working principle of asymmetric 3-roll plate rolling machine Figure 7-1 Working principle of plate bending machine: a: symmetric 3-roller plate bending machine; b: asymmetric 3-roller plate bending machine; c: 4-roll plate bending machineFigure 7-1(b) is the bending drum diagram of the asymmetric three-roll plate bending machine. The upper roll 1 is located on the top of the lower roll 2, and the other roll 3 is on the side, which is called the side roll. The upper and lower rollers are rotated by the same motor. The lower roller can be adjusted up and down, and the maximum distance of adjustment is approximately equal to the maximum thickness of the steel plate that can be bent. The side roller 3 is passive and can be adjusted in the inclined direction.
working principle of initial pinch 3 roll bending machineWhen bending, sheet material 4 is fed into the upper and lower rollers, and then the lower roller is adjusted to compress the sheet material to generate a certain frictional force, and then the position of the side rollers is adjusted. When the upper and lower rollers are driven by the motor to rotate, the sheet material is bent.
The advantage of this asymmetric three-roll plate bending machine is that the edges at both ends of the plate can also be bent, and the length of the remaining straight edge is much smaller than that of the symmetrical three-roll plate bending machine, and its value is less than twice the plate thickness. Although the sheet material cannot be bent between the side roll and the lower roll, the whole bending process can be completed as long as the sheet material is taken out from the rolling machine and then turned around and bent.
Single-pinch 3 Roll Bending MachineSingle-pinch 3-roll bending machines/asymmetric 3-roll plate rolling machine typically necessitate inserting the sheet metal twice to pre-bend both ends. However, there are also double-pinch models available, streamlining the pre-bending process on both ends, enhancing efficiency, speed, and precision.
Single initial-pinch 3-roll plate rolling machines are generally best suited for light-capacity applications. They may operate electromechanically or hydraulically, pinching the flat sheet between two vertically opposed rolls while the third bending roll moves upward to contact and bend the sheet. These machines, often older in design, typically require the removal and reinsertion of the sheet to pre-bend both ends. While cost-effective, they tend to be more labor-intensive in a production setting compared to their modern counterparts.
The working principle of the 4-roll plate rolling machine 4-roll bending machineFigure (c) is a four-roll plate rolling machine, which is basically similar to the asymmetric three-roll plate rolling machine, except that one side roller 3 is added. It eliminates the trouble of turning around and bending the sheet on the asymmetric three-roll rolling machine.
Figure 7-1 Working principle of plate bending machine: a: symmetric 3-roller plate bending machine; b: asymmetric 3-roller plate bending machine; c: 4-roll plate bending machine
4 Roll Bending Machines feature a top roll, a pinching roll, and two side rolls, enabling them to produce bends with unparalleled speed and accuracy. These plate rolling machines are renowned for their efficiency.
The flat metal plate is positioned within the machine, typically on one side, and undergoes pre-bending on the same side. The side rolls execute the bending action while the pinching roll securely holds the plate in place. With the plate firmly clamped between the top and bottom rolls, the side rolls move vertically to initiate the bend. As the bottom roll ascends to maintain secure contact with the top roll, the side roll is raised to achieve precise pre-bending, minimizing any flat zones on the plate&#;s edge.
Plate feeding can occur from either side of a 4-Roller Plate Rolling Machine. When fed from a single side, these machines can be placed against a wall, optimizing floor space utilization.
The side rolls are positioned to the right and left of the bottom roll, each operating on its own axis. This independent axis configuration contributes to achieving flawless bends. Additionally, the back-side roll, located opposite the feeding point, serves as a back-gauge, ensuring plate alignment without requiring operator assistance.
The constant secure clamping of the top and bottom rolls maintains plate squareness without slippage during both pre-bending and rolling processes. Unlike three-roll initial-pinch machines, 4-Roller Bending Machines eliminate the need for operators to remove, flip, and square the plate a second time after pre-bending, enabling a more streamlined operation. Additionally, a cylinder can be rolled to the desired diameter immediately after pre-bending, as the material remains within the machine.
Bending of the back edge occurs post-cylinder rolling, allowing for a one-direction, single-pass operation. For cone-rolling applications, the side rolls can be tilted to establish the cone angle, while the bottom roll can also be tilted to clamp and drive the major end of the cone.
4-Roller Plate Benders offer versatility, enabling the creation of rectangular, elliptical, and square-shaped outputs by precisely bending the metal in specific areas as it passes through the machine.
Cone bending Cone BendingCone bending is a specialized application of plate rolling, where a metal plate is shaped into a cone structure. To achieve this, the metal plate must be accurately cut to the correct dimensions before bending. Typically, a flat metal blank with the appropriate inner and outer radius is prepared to form the desired cone shape.
During the bending process, the blank is fed into the plate roller with one side aligned against a cone rolling attachment. The inner radius of the blank is fed through the roller at a slower rate compared to the outer radius. This meticulous process demands precision and exactness, resulting in the time-consuming fabrication of cones.
Both three-roll and four-roll plate rolling machines can be employed for cone bending. These machines have the capability to incline the forming rolls in a positive attitude, and they should be equipped with a hardened contrast die to regulate and slow down the speed of the smaller diameter.
Guiding the small diameter and inclining the rolls are essential steps in successfully rolling a cone. This process creates an atypical scenario for the rolling operation. However, on a three-roll double pinch machine where all three rolls are driven, it becomes challenging for the contrast die to effectively retard the rotation of the small diameter while simultaneously moving the larger diameter at a faster rate.
In contrast, a four-roll machine equipped with inclinable forming rolls and a hardened contrast die is better suited for rolling cones. The additional control provided by the inclinable rolls and the contrast die enhances the precision and efficiency of the cone bending process, resulting in superior cone fabrication compared to a three-roll machine.
Radius of curvatureThe plate rolling machine basically consists of three parallel steel rollers, arranged similarly to the vertices of an isosceles triangle.
The sheet metal when passes between the lower and upper rollers change its shape and undergo a curvature, known as the radius of curvature. This so-called radius depends on the mutual position of the three steel rollers.
The radius of curvature in plate rolling refers to the curvature or radius achieved when a metal plate is bent into a cylindrical or conical shape using a rolling machine. It essentially represents the distance from the center of the curve to the outer edge of the rolled plate.
The radius of curvature depends on several factors, including the thickness and width of the plate, the diameter of the rolls on the rolling machine, and the bending process used. Generally, a smaller radius of curvature indicates a tighter bend or a more pronounced curve, while a larger radius signifies a gentler bend.
In plate rolling, achieving the desired radius of curvature requires precise control over the bending process, including the adjustment of roll positions, pressure, and feed rates. Advanced rolling machines often offer features such as variable geometry or adjustable roll positions to achieve a wide range of radii for different applications.
Bending Process CalculatorHere we provide some calculators for the metal bending process, hoping they will be helpful to you!
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Deformation Analysis of the Bending ProcessAccording to the characteristics of rolling deformation, the plate rolling process can be divided into elastic deformation, elastic-plastic deformation, and pure plastic deformation stages.
a&#;elastic deformation; b&#;elastic-plastic deformation; c&#;pure plastic deformationIn the initial stage of the bending of the barrel blank, the external bending moment is not large, the value of the internal stress is less than the yield limit σs of the material, and only elastic deformation is caused inside the blank, which is called the elastic deformation stage. When the value of the external bending moment continues to increase, the internal stress exceeds the yield limit, and the deformation in the deformation zone of the blank transitions from elastic deformation to elastic-plastic deformation and pure plastic deformation.
Deformation AnalysisAs can be seen from the above figure, the upper stress of the blank section transitions from the outer tensile stress to the inner lamination stress, and there must be a layer of metal in the middle, whose tangential stress is zero, called the stress neutral layer, and its curvature radius is represented by ρσ. Similarly, the distribution of strain transitions from the tensile strain of the outer layer to the compressive strain of the inner layer, and there must be a layer of metal with zero strain in between, that is, when the coil is deformed, its thickness remains unchanged, which is called the strain neutral layer, and its radius of curvature It is represented by ρε. This is the basis for accurately calculating the unrolled size of the round blank. When the deformation is small, ρσ=ρε=r+t/2, that is, the stress neutral layer and the strain neutral layer overlap, and in the middle of the blank thickness, when the deformation is large, the stress neutral layer and the strain neutral layer are opposite to each other. Inward displacement and the displacement of the stress neutral layer is greater than the displacement of the strain neutral layer, that is, ρε>ρσ, in the production of coiled plates, the following empirical formula can be used to determine the position of the strain neutral layer, namely
ρε=r+xt (7-1)
In the formula: ρε&#;&#;curvature radius of strain neutral layer, mm; r&#;&#;involution circle radius, mm; x&#;&#;coefficient related to the degree of deformation, take x=0.33; t&#;&#;material thickness, mm.
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Top 9 Applications of Plate Rolling MachineA plate bending machine, also known as a plate rolling machine or a roll bending machine, is used to bend and shape metal plates and sheets into curved or cylindrical forms. These machines are widely used in various industries that require the fabrication of components with curved surfaces. The primary purpose of a plate bending machine is to provide the means to transform flat metal sheets into different shapes, such as cylinders, cones, and segments.
Cylindrical Tanks and VesselsPlate rolling machines are indispensable for shaping metal plates into cylindrical tanks and vessels across industries. These machines utilize controlled pressure and precision to curve metal sheets into the required cylindrical forms. By adjusting roller positions and manipulating the bending process, plate rolling machines ensure consistent curvature and meet stringent dimensional tolerances. This capability is critical for constructing leak-proof containers capable of holding liquids or gases under pressure. Industries such as petrochemicals, oil and gas, food processing, and manufacturing rely heavily on plate rolling machines to fabricate cylindrical components essential to their operations. The use of plate rolling machines guarantees efficiency, accuracy, and safety in the production of cylindrical tanks and vessels, reinforcing their vital role in various industrial sectors.
Pressure VesselsPressure vessels, critical for storing fluids under high pressure, often rely on plate rolling machines. These machines shape the cylindrical segments essential to vessel construction. Plate rolling machines bend metal plates into precise curves, ensuring compliance with tight dimensional tolerances. By adjusting roller positions and pressure, these machines guarantee consistent curvature, essential for structural integrity.
Pressure vessels demand precision and adherence to rigorous standards. Plate rolling machines contribute to the vessel&#;s reliability by producing curved components that meet required specifications. The machines&#; versatility in handling different metals and their ability to accommodate complex shapes make them invaluable in pressure vessel fabrication.
Efficiency is another advantage. Plate rolling machines streamline the process, reducing the need for additional machining. Additionally, these machines ensure uniform stress distribution across curved components, enhancing vessel safety under pressure.
Architectural and Structural ComponentsPlate rolling machines are essential in creating architectural and structural components for various industries. These machines bend metal sheets into specific shapes, catering to the aesthetic and structural demands of construction projects.
In shipbuilding, plate rolling machines are indispensable tools that contribute to the construction of various components used in ships and vessels. These machines are crucial for forming metal plates into specific shapes required for the hull, decks, and other structural elements of ships.
Ship Plate Bending MachineWind tower bending machines are specialized equipment used in the fabrication of wind turbine towers, particularly for bending and shaping the large steel tubes or pipes that compose these towers. These machines are essential in the production of curved or tapered tower sections required for wind turbines.
The BIT PR Wind Tower Bending Machine with a High Productivity Package is a specialized system designed specifically for manufacturing on-shore wind turbine towers, foundations, and offshore structures. BIT PRV plate rolling machines and PR4 4 roll plate rolling machines offer advanced features and capabilities tailored to the demands of the wind energy industry.
Industrial EquipmentIn the realm of industrial equipment manufacturing, plate rolling machines are pivotal tools for crafting components with curved or cylindrical shapes. These machines are employed to shape metal plates into parts like conveyor rollers, cylinders for hydraulic systems, and specialized machinery components. By imparting controlled pressure and curvature, plate rolling machines create precise, load-bearing structures integral to various industrial processes. Their efficiency and accuracy contribute to the fabrication of components that withstand rigorous industrial environments, ensuring the reliable operation of machinery and systems across diverse sectors, including manufacturing, mining, construction, and materials handling.
Automotive IndustryIn the automotive industry, plate rolling machines play a vital role in shaping metal components used in vehicle manufacturing. These machines are used to bend metal plates into specific curved or cylindrical forms required for various automotive parts. Plate rolling machines are essential for producing components like exhaust pipes, chassis parts, structural elements, and body panels.
The machines&#; precision ensures that these components align accurately during assembly, contributing to the overall structural integrity and safety of the vehicles. Whether it&#;s creating curved sections for exhaust systems or forming intricate shapes for body panels, plate rolling machines offer efficiency and accuracy in producing parts that meet the stringent requirements of the automotive industry. Their ability to work with different materials, such as steel and aluminum, makes them versatile tools in the production of vehicles with varying specifications and designs. Plate rolling machines contribute to the efficiency, quality, and reliability of automotive manufacturing processes, helping to create vehicles that are both functional and aesthetically appealing.
HVAC and DuctworkIn the HVAC (Heating, Ventilation, and Air Conditioning) industry, plate rolling machines are instrumental in shaping metal sheets into curved and cylindrical components for ductwork and ventilation systems. These machines are used to form ducts, pipes, and fittings that facilitate the movement of air within buildings.
Plate rolling machines create precise bends and curves in metal sheets, ensuring that ductwork components fit together seamlessly. Whether it&#;s circular, oval, or rectangular ducts, these machines provide the necessary curvature for efficient air circulation.
Ductwork is a critical component of HVAC systems, allowing air to be transported to various areas within a building. Plate rolling machines contribute to the fabrication of ducts that are structurally sound, leak-resistant, and capable of maintaining proper airflow.
By utilizing plate rolling machines, the HVAC industry can efficiently produce customized ductwork that conforms to specific building layouts and design requirements. These machines enhance the manufacturing process, ensuring that ducts and components are accurately formed and contribute to the optimal performance of heating and cooling systems in residential, commercial, and industrial settings.
Custom FabricationPlate rolling machines are integral to the world of custom metal fabrication, enabling the creation of unique and specialized components tailored to specific design requirements. These machines are essential tools for transforming flat metal sheets into curved, cylindrical, or intricate shapes that meet the diverse needs of various industries.
Custom fabrication projects often demand components with precise dimensions, curvatures, and tolerances. Plate rolling machines excel in this regard by delivering accurate and repeatable results. They can shape materials such as steel, aluminum, and alloys, catering to a wide range of applications.
From artistic sculptures to specialized industrial machinery, plate rolling machines contribute to the realization of innovative ideas. By offering versatility in producing custom curves and contours, these machines empower fabricators to bring their creative visions to life and meet functional specifications.
Whether in architectural features, automotive modifications, or specialized equipment production, plate rolling machines play a pivotal role in transforming raw materials into customized components that adhere to exacting standards. They ensure that each project maintains its uniqueness while delivering structural integrity, precision, and efficient production in the realm of custom fabrication.
OverallThe specific application of a plate bending machine depends on the industry&#;s requirements, the types of materials being used, the desired shapes, and the precision needed. These machines are valuable assets in industries that require versatility, accuracy, and efficiency in shaping metal components with curved geometries.
The plate rolling machine is a general-purpose equipment for bending metal sheet into cylindrical, curved or other shaped workpieces. According to the principle of three points forming a circle, using the relative position change and rotational movement of the workpiece to produce continuous plastic deformation of the sheet to obtain a workpiece of a predetermined shape. The product is widely used in boiler, shipbuilding, petroleum, woodworking, metal structure and other machinery manufacturing industries.
&#; Three-roller rolling machine: including symmetrical three-roller rolling machine, asymmetrical three-roller rolling machine, horizontal down-regulating three-roller rolling machine, inclined down-regulating three-roller rolling machine, curved down-regulating three-roller rolling machine and vertical roll-down three-roller rolling machine etc.
&#;Mechanical three-roller symmetry
Performance characteristics of mechanical three-roller symmetrical plate bending machine: The structure of the machine is three-roller symmetrical. The upper roller moves vertically at the center symmetrical position of the two lower rollers. It is obtained by the transmission of the screw nut and the worm. Rotational motion, through the output gear of the reducer meshing with the lower roller gear, provides torque for the rolled sheet. The disadvantage of this machine is that the end of the plate needs to be pre-bent with other equipment.
&#;Mechanical three-roll asymmetrical
The main features of the mechanical three-roll asymmetrical plate bending machine: the structure of the machine is a three-roll asymmetrical type, the upper roller is the main drive, and the lower roller moves vertically to clamp the plate and mesh with the upper roller gear through the lower roller gear, At the same time as the main drive; the side rollers are tilted and lifted, with dual functions of pre-bending and rounding. Compact structure, convenient operation, and maintenance.
The main features of the hydraulic three-roller symmetrical plate bending machine: the upper roller of the machine can be vertically raised and lowered, and the vertical lifting hydraulic transmission is obtained by the hydraulic oil in the hydraulic cylinder acting on the piston rod; the lower roller is driven in rotation, and the output gear meshes through the reducer. To provide torque for the coil, there is an idler under the lower roller, which can be adjusted. The upper roller is in the shape of a drum, which improves the straightness of the product and is suitable for ultra-long tanks with various cross-sectional shapes.
It is an upward-adjusting symmetrical three-roller plate rolling machine, which can roll metal sheets into circular, arc-shaped, and conical workpieces within a certain range. The two lower rollers of this model are the driving rollers and the upper roller is the driven roller. It is widely used in shipbuilding, boiler, aviation, hydropower, chemical, metal structure, and machinery manufacturing industries.
It is suitable for the bending deformation of metal plates. It can roll around, arc and tapered workpieces within a certain range, and has the function of pre-bending the end of the plate. The two lower rollers of this model are active rollers that can move horizontally. The roller is a driven roller that can move up and down. There are mechanical and hydraulic movement modes. The driveshafts are all connected by universal couplings.
&#; Four-roller rolling machine: divided into side-roller tilt-adjusting four-roller rolling machine and side-roller arc-adjusting four-roller rolling machine.
&#; Special-purpose plate rolling machine: vertical plate rolling machine, marine plate rolling machine, double roll plate rolling machine, cone plate rolling machine, multi-roll plate rolling machine and multi-purpose plate rolling machine, etc.
The upper roller of the symmetrical plate rolling machine is at the symmetrical position of the two lower rollers through the hydraulic oil in the hydraulic cylinder to act on the piston for vertical lifting movement, and the final gear of the main reducer drives the gears of the two lower rollers to mesh for rotating motion, which is the rolling motion Provide torque. The flat plastic metal plate of the plate rolling machine passes between the three working rolls of the plate rolling machine. With the help of the pressing of the upper roller and the rotation of the lower roller, the metal plate is continuously bent through multiple passes, resulting in permanent plastic deformation. Roll into the required cylinder, cone, or part of them. The disadvantage of this hydraulic three-roller bending machine is that the end of the plate needs to be pre-bent with the help of other equipment. This rolling machine is suitable for large rolling machines with a thickness of more than 50mm. A row of fixed idlers is added under the two lower rollers to shorten the span of the two lower rollers, thereby improving the precision of the rolled workpiece and the overall performance of the machine.
&#; The movement form of the plate rolling machine
The movement form of the plate rolling machine can be divided into two forms of main movement and auxiliary movement. The main motion refers to the movement of the upper and lower rollers constituting the plate rolling machine to rotate and bend the processed plate, and the main motion completes the processing tasks of the plate rolling machine. Auxiliary movement is the form of movement of the loading, unloading and lifting of the upper roller, the lifting and the turning of the headstock during the rolling process of the plate bending machine.
The mechanism is a three-roller symmetrical type. The upper roll is vertically moved at the symmetrical position of the two lower rolls. It is obtained by the screw and screw worm drive. The two lower rolls are rotated. Engagement to provide torque for rolled sheet.
Working principle diagram of three-roller rolling machine
The main motion refers to the upper roller around 01 and the lower roller around 02 and 03 for clockwise or counterclockwise rotation. Auxiliary movement refers to the upward or downward movement of the upper roller, as well as the upward roll and flanging movement of the upper roller in the 01 vertical plane.
&#; Processing method of bending
In the manufacture of steel structures, the bending process is mainly several processing methods such as coiling (rounding), bending (simmering) hemming, and die pressing. The bending process is completed by hot or cold processing.
Spheronization is to make the outer fiber of the steel plate elongate under the action of external force, and the inner fiber shortens to produce bending deformation (the middle fiber does not change). When the radius of the cylinder is large, it can be rolled at room temperature. For example, when the radius is small and the steel plate is thick, the steel plate should be heated and rolled. There are three processing methods for round steel plate at room temperature: mechanical rounding, tire mold pressing and manual production. Mechanical spheronization is carried out on a plate rolling machine (also called a plate rolling machine or a rounding machine).
The bending of the plate on the plate rolling machine is achieved by the pressure generated when the upper roller moves downward. Their working principle is as shown.
Schematic diagram of rounding machine
With three-roller bending machine, the two ends of the plate need to be pre-bent, and the length of the pre-bend is 0.5L + (30 ~ 50) mm (L is the center distance of the lower roller). The pre-bending can be pre-bending with press molding or with a pallet in the rounding machine.
Schematic diagram of steel plate pre-bending
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