金属薄板连续多次弯曲以产生持久的塑性变形，然后将其轧制成所需的圆柱体、

Sheet metal bent several times in succession to produce a permanent plastic deformation, which is then rolled into the desired cylinder, a cone or a portion thereof. <br>A disadvantage of this hydraulic three-roll bending machine comprising: an end plate need to be pre-bent by other devices. This is suitable for coiling the rolled thickness of 50mm or more large metal plate. Fixing a row of two rollers are added to the lower two lower rollers to shorten the span of the lower roller, thereby improving the overall performance and accuracy of the rolling machine the workpiece.

The sheet metal bends several times in succession to create a long-lasting plastic deformation, and then rolls it into the desired cylinder, cone or part of it.<br>The disadvantage of this hydraulic three-roll bending machine is that the end of the plate needs to be pre-curved by other equipment. The coil machine is suitable for large metal plates with a volume thickness of more than 50mm. A row of fixed rollers is added to the lower part of the two lower rollers to shorten the span of the two lower rollers, thereby improving the accuracy of the rolling workpiece and the overall performance of the machine.

The sheet metal is continuously bent several times to produce permanent plastic deformation, and then rolled into the required cylinder, cone or part of it.<br>The disadvantage of the hydraulic three roll bending machine is that the end of the plate needs to be pre bent by other equipment. The rolling machine is suitable for rolling large metal plates with a thickness of more than 50 mm. A row of fixed rollers are added to the lower part of the two lower rollers to shorten the span of the two lower rollers, thus improving the accuracy of the rolled workpiece and the overall performance of the machine.<br>