The mechanica asymmetric 3-roll rolling machine is characterized in that its 3 working rolls (an upper roll, a lower roll and a side roll) are asymmetrically arranged. During operation, the plate is arranged between upper and lower rolls and the lower roll moves vertically to clamp the plate. The upper and lower rolls are driving parts and rotate in opposite directions. The side roll is a driven part and can obliquely move up and down within the guide surface at an angle with the vertical surface formed by axial lines of upper and lower rolls so as to roll the plate with required curvature radius. The asymmetric 3-roll rolling machine has advantages of compact structure, easy operation and maintenance and capability of pre-bending and circle rolling.
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