MetFab Machines Mumbai offers 4 Rolls Cnc Plate Machine, 3 Rolls Plate Machines, 2 Rolls Plate Machines, Plate Rolling Machines, Plate Rolls, Rolls, 3 Roll Benders, 3-Rolls Machines, 4-Rolls Machines Initial Pinch, Three Roll One of the most common plate rolling configurations, the initial-pinch system entails introducing the plate to the rolls so that roll A and B grip the part, while roll C performs the first prebend. Next, you turn the material 180 degrees and insert the plate to prebend the other edge. Then, you use all three rolls to close the cylinder.Double Pinch, Three Roll Three-roll machines generally require prebending the leading end, running the sheet through the machine to prebend the trailing end, and then switching roll rotation direction to roll the cylinder body. In this setup, you first lower roll C and raise roll B, then introduce the plate between A and B. Once the plate is gripped, you raise roll C to form the first prebend. Next, you pass the roll through the machine so that the plate is gripped between rolls A and C, then raise roll B to perform the second prebend. Finally, you position the rolls in a standard pyramid configuration and roll the cylinder. Smaller machines can be mechanical, but most are hydraulic and include drop end yokes for easy extraction of the workpiece. When a cylinder is completely rolled, it is extracted from the top roll. Machines generally are equipped with some type of top roll release mechanism that allows for the cylinder’s extraction. This extraction is accomplished with the help of a forward-tilting or forward-releasing top roll or a removable end yoke.Double Pinch, Four Roll The four-roll styles have an additional roller underneath the top roll, which constantly pinches the plate during rolling. Four-roll plate rolls have a slight advantage in cycle time because they permit prebending of the leading edge, rolling the cylinder body, and finishing off the trailing prebend, all while rolling in the same direction. These machines are known for their speed, mainly because the workpiece doesn’t have to be removed before rolling to perform the second prebend. Double-pinch rolls can prebend both plate ends without removal, as is required with single-pinch rolls. You introduce the plate, and the machine grips it between rolls D and C. Roll A then moves up for the first prebend. The system then forms the cylinder, after which roll B raises up to perform the second prebend. When a cylinder is completely rolled, it is extracted from the top roll. Machines generally are equipped with some type of top roll release mechanism that allows for the cylinder’s extraction. This extraction is accomplished with the help of a forward-tilting or forward-releasing top roll or a removable end yoke. Four-roll plate rolls generally are the only equipment with NCs or CNCs because the fourth roll provides constant pinching action, minimizing the chance for slippage. 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 synch with the rolling movement. FAQ:- What is the arrangement provided for balancing of top roll when swing arm is opened? Top roll is counter balanced automatically once the drop end is opened without any jacks or manual arrangement.What is done to compensate for deflection of rolls during pre-bending and rolling? All three rolls are crowned (cambering) for compensating deflection.Is there any method to know the position of bottom rolls? DRO (Digital Readout) is housed on the operating console which gives the position of the bottom rolls with respect to the top roll.What is the Capacity for cone bending ? Cones can be bent up to the edge-bending capacity of the machine. The bottom rolls can be inclined for the required cone angle.Is the main drive reversible? Forward and reverse to the main drive is provided. The bottom rolls can be moved up and down individually.Where are the main machine controls ? 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.Can we bend hot plates on the machine to get higher thickness capacity ? 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.
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