High Precision Steel Plate Rolling Machine For Cylindrical Shell And Cylinder

Product Specification

Product Introduction:

Working Principle

The upper roller of the symmetrical three-roll plate rolling machine sits in a symmetrical position between the two lower rollers. Hydraulic oil in the hydraulic cylinder acts on the piston to produce a vertical lifting movement, while the final gear of the main reducer drives the gears of the two lower rollers in mesh to generate rotational movement, providing the torque for rolling. The flat plastic metal plate passes between the three working rolls of the machine (two lower rolls and one upper roll); by means of the downward pressure of the upper roll and the rotation of the lower rolls, the metal plate undergoes continuous multi-pass bending — the inner layer is compressed and deformed, the middle layer remains unchanged, and the outer layer is stretched and deformed — so that it is progressively rolled into the required cylindrical shell, tube course or curved segment, with roundness assured by incremental multi-pass reduction and edge pre-bending.

Cylindrical Shell Rolling Process (Multi-Pass Continuous Forming)

Cylindrical shells are normally produced by progressive multi-pass forming: under the down-pressure of the upper roll and the synchronous rotation of the two lower rolls, the plate travels back and forth while a controlled reduction is applied at each pass, so curvature accumulates pass by pass until the plate ends meet and close into a cylinder. Because the generatrix of the upper roll stays parallel to both lower rolls, the plate receives uniform curvature across its full width, giving cylindrical courses with high roundness, straight axial generatrices and well-matched longitudinal seams. Where tapered or conical workpieces are genuinely required, a forced limit stop block can be fitted at the front of the machine so that the speed differential between the large and small ends produces the cone; in that case a process allowance must be reserved on the small-end blank to compensate for mutual wear against the stop block.

Three-Roll and Four-Roll Configurations

On a three-roll plate rolling machine, one roll is located above the workpiece and is called the upper roll, while two rolls are located below the workpiece and are called the lower rolls. On a four-roll machine, one roll is located below the workpiece in the same vertical plane as the upper roll and is called the center lower roll, and the other two are located on either side of the upper roll and are called the side rolls; the upper roll can work together with any two of the side rolls and the center lower roll to bend the workpiece.

Product Parameters:

Main Technical Specifications

Main Structure Composition:

Note: The above parameters are taken from the supplied technical material. The equipment is built to order; actual delivered parameters are subject to the technical agreement confirmed for the customized order.

Product Features:

1. High Flexibility

Continuous, uniform rolling of the metal plate into cylindrical shells, tube courses and curved workpieces of different diameters, lengths and curvatures, covering the processing requirements of cylinders in a wide range of sizes.

2. High Machining Accuracy

Precise adjustment of roller position and pressure enables accurate rolling of the metal plate, ensuring machining accuracy and quality.

3. Wide Application Range

Capable of processing metal plates of different materials and thicknesses, suitable for manufacturing in a variety of industries.

4. High Production Efficiency

Mechanical transmission or electric drive systems deliver efficient rolling and raise overall productivity.

5. Reliable Cylindrical Shell Forming through Uniform Full-Width Curvature

The upper roll generatrix stays parallel to both lower rolls, so the plate is pressed and fed evenly across its full width, producing cylindrical shells with high roundness, straight axial generatrices and well-matched longitudinal seams, and consistent, interchangeable geometry from part to part.

6. Robust Structure and Proven Material Specification

Key components are 45# steel forgings quenched and tempered to HB245-285; the lower roller gear teeth are high-frequency hardened to HRC45-50; sliding bearings use composite material; the worm wheel and nut use zinc-based alloy; frames and base are welded steel plate with post-weld vibratory aging.

7. Comprehensive Electrical Protection and Safety

Short-circuit and overload protection, limit switches at each moving-part terminal and emergency stop buttons protect both the operator and the equipment.

Operating Precautions:

1. Routine Inspection of Fasteners and Belts

Check the working condition of the machine regularly, in particular whether connecting bolts are loose and whether belt tension is kept within a reasonable range.

2. Keep the Machine Clean

Remove accumulated material and dirt from the joints and mating parts of the machine in good time; excessive dirt adhering to the equipment adversely affects its operation.

3. Check for Tracking Deviation

Check whether the machine runs off track; if it does, correct and repair it promptly.

4. Fire Safety During Night Shifts

Avoid open flames at night, extinguish all ignition sources completely, and arrange for personnel to be on duty to prevent hazards caused by fire.

5. Regular Lubrication and Noise Inspection

Add grease and oil to the components periodically. Check for abnormal noise; if any is present, carry out a full overhaul, and replace missing parts without delay.

6. Professional Repair of Faults

If the equipment has already failed, professional maintenance personnel must be called in, so as to ensure the problem is properly resolved.

7. Work Within the Specified Range

Plate thickness and material must remain within the range specified for the machine. Overload operation leads to loss of accuracy and damage to the rollers and transmission.

8. Straight-Edge Control in Circle Rolling

Straight edges at the plate head and tail are a rolling defect. Fitters may trim the edge to remedy it, or use an arc-leading plate during rolling to avoid straight edges. Rolling cylindrical courses calls for considerable operator experience to keep roundness and workpiece quality consistent.

9. Pre-Bending and Curvature Measurement

Place the steel plate on the machine against the side rolls, aligned and squared before starting. After start-up, the rolls carry the plate to the pre-bending position, with the plate end located between the upper and lower rolls. Measure the curvature of the workpiece end; if the required curvature has not been reached, continue pre-bending until it is.

Product Applications:

Steel plate rolling machines are widely used in the aerospace, shipbuilding, and petrochemical industries, mainly to roll metal plate into cylindrical shells, tube courses and curved components. Typical applications include:

1. Aerospace: Cylindrical shells, curved cowlings and tower segments requiring controlled roundness, curvature and generatrix consistency.

2. Shipbuilding: Cylindrical hull plating, hull ring sections, exhaust funnels and other cylindrical shell structures.

3. Petrochemical Industry: Cylindrical oil tank shells, tank courses, reactor shells and other cylindrical vessel structures.

4. Pressure Vessels and Storage Tanks: Cylindrical courses, shells and transition sections for vessels and storage equipment.

5. General Metal Fabrication: Cylindrical and curved sheet-metal workpieces, including cylindrical silos, transition courses, elbows and reducers.

Note: The applications listed above are typical references; the actual processing capacity is subject to the specification of the delivered machine.