Roller mill is used for rolling thin-walled and extremely thin-walled pipes. The principle of its work lies in the reciprocating motion of the crate. The rolling process is in a cylindrical mandrel. The number of squeeze rollers depends on the scheme used and is usually 3−4 working roller. The radius of the partial depth of the stream is cut round the perimeter of the rollers. Straight running crate ends closed round caliber, limited the working rollers. Due to supporting slats, which are based on the working rollers (axles or the surface of the stream) in the course of crate changes the clearance ring between the mandrel and the gauge.
The initial clearance shall provide for free axial movement of the workpiece through the camp. The crimping of the workpiece is as you move the rollers and narrowing annular gap. Stop rollers occurs at the end of a forward stroke, followed by a reverse cell. At the end of the cycle the rollers away from the workpiece, the rotating mechanism rotates at an angle of 60° and applies for re-rolling.
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