JMT PR4H 3016 Plate Bending Machine
JMT PR4H 3016 PLate Bending Machine General Details
Our experienced engineers design the mechanical and hydraulic systems on the JMT PR4H 3016 Plate Bending Machine. These engineers design the machines utilizing parametric 3D engineering technology and implementing mechanical and static analysis. Electrical and mechanical engineers design and test all mechanical, hydraulic, and electronic systems. Only following lengthy tests and evaluations are the machines authorized to be manufactured in serial production.
Product Description
JMT PR4H 3016 PLate Bending Machine Technical Details
JMT 4-Roll Plate Roll Overview
JMT PR4H RECTILINEAR GUIDED ROLLS
The side rolls are guided by a rectilinear system
that moves them in a straight line direction
(instead of the curved path of planetary guides)
giving them the strength to pre-bend and rolling
heavy plates
JMT PR4H HIGH TORQUE DRIVE SYSTEM
Because of its high torque drive, a JMT machine bends the part with fewer steps. Rolls are powered by independent high-torque hydraulic motors and planetary gearboxes.
The activation system is positioned on the same axis as the roll, so high torque is transferred to the sheet without any power loss. Especially during the pre-bending, the hydraulic breaks do not allow the plate to slip back which may create safety problems.
BENEFITS OF 4-ROLL PLATE BENDING MACHINES
• Four Four-roll plate rolls are more precise, productive, versatile, faster, safer, and easier to operate than three-roll machines. They are less dependent on operator competence. They are ideal for bending plates up to 90 mm thick.
• The fastest and most accurate bends are made by four roll machines. The plate is held securely in place between the top and bottom rolls while the side rolls move vertically to create the bend.
• The bottom roll moves up to hold the plate edge securely against the top roll while the side roll is raised to form an accurate pre-bend, minimizing the flat zone on the plate edge. Pre-bending on a three-roll machine requires that plates be tilted down as they are being fed. In contrast, plates are loaded horizontally at the feed level for pre-bending on a four-roll machine, which allows them to take place on either side of a four-roll machine. If fed from only one side, they can even be placed up against a wall to save floor space.
• The side rolls are positioned to the right and left of the bottom roll and are on their axes. The independent axis of each roll helps make a perfect bend. The “back” side roll (at the far side of the feeding point) also functions as a back gauge to square the plate for proper alignment. This eliminates the need for someone to assist the operator.
• The plate is kept square without slipping during both pre-bending and rolling because of the constant secure clamping of the top and bottom rolls.
• Four roll machines do not require the operator to remove, flip, and then try to square and reposition the plate a second time after first pre-bending, as is the case with three roll initial pinch machines. Keeping the material in the machine makes four rolls 50% more efficient than three-roll initial pinch machines, and allows cylindrical shapes to be rolled to the required diameter immediately following pre-bending.
• Bending the back edge takes place after the rolling process, for a one-direction and single-pass operation. This process provides less working area.
• Cone rolling is easier on a four-roll machine. The side rolls can be tilted to establish the cone angle and the bottom roll can also be tilted opposite side to clamp and drive the end of the plate. (Standard feature on JMT rolls)
• Four roll machines are the only type of plate rolls that can effectively make use of NC and CNC controls. Because of the constant clamping and driving of the material during all steps of rolling. Bending complex shapes like polycentric or elliptic workpieces can be easily done with JMT four-roll machines.
Strengthened Bearing Guidance System
The rolls are guided with spherical roller bearings. This guidance system requires less lubrication and assures long-term precision.
Durable Rolls and Crowning System
The most important element of a plate roll is the rolls themselves. Most machines in the market have weak rolls that deform during the bending process when small diameters of 5x the top roll are reached JMT uses high-tensile carbon steel rolls that are machined by high-precision CNC lathes. The working surfaces of the rolls are CNC induction hardened to HRc 52-58 (5-6 mm deepness) with hardness tests performed at varying points on the rolls. Rolling 1.5 x top roll diameter is acquired easily. The rolls are machined with a crown to compensate for the deflection of the rolls during the bending process. Special Crowning for other materials can be applied free of charge when ordering.
Hydraulic and Electrical Systems
Machine movements are provided by hydraulic components. The precision on all axes is acquired by world leader Parker valves’ high-speed response-ability. Pressure safety valves used against peak pressures and overload protect motors and other components. The electrical system is designed compatible with CE safety regulations. The system consists of well-known electrical components such as Siemens, Schneider, Phoenix, Koyo, and Opkon. The system is protected by current overloading for its components, power supplies, electronics, and motors. Control Unit used by world leader Esautomation from Italy.
Precise Four Roll Synchronization System
The bottom and side rolls are positioned by six different strong hydraulic cylinders. Adjustable pinching pressure compensation allows the rolling of different thicknesses of material with minimum deformation. Synchronization between the rolls is acquired by linear encoders and PLC. The PLCs respond within milliseconds due to high-precision proportional valves.
