Abstract: A machine for semi-automatic grooving of pipe, capable of high output of full or less than full lengths of pipe with uniform external circumferential grooves, has supporting idler rolls for automatic positioning of the pipe axis at a small angle of deflection to draw the pipe end in as grooving progresses, with respect to a driven backup roll and a freely rotatable grooving roll. Pipe vibration during rotation is damped by hydraulic means. An adjustable groove depth control and a safety mechanism are also provided.

Abstract: A method of rolling an initially annular workpiece between forming rolls in which after the forming rolls have been fully advanced they are retracted initially slowly for a predetermined distance. The forming rolls can then be further retracted at a greater speed. The slow retraction reduces the out of roundness of the finished rolled ring.

Abstract: A rolling machine for rolling an annular workpiece. The machine includes a mandrel for supporting the workpiece. The mandrel has two co-operating sections separated across its axis and a part of each section is shaped to conform to the rolled profile of a part of the workpiece.

Abstract: A method of roll forming an annular workpiece to a desired shape from a workpiece having dimensions within a tolerance range, in which the difference in weight between the workpiece and a nominally sized workpiece is determined and the workpiece is then roll formed to its desired shape by being squeezed between at least two rotating forming members which advance relatively towards one another to a fully advanced position to impress the desired shape into the workpiece followed by maintaining the forming members at their fully advanced position to complete the roll forming for a period of time known as the dwell time.

Abstract: A method of forming to shape an initially annular workpiece in which the workpiece is rotated and squeezed between a pair of opposed forming rolls at least one of which is advanced relatively towards another. A pair of opposed growth control rolls are situated at right angles to the forming rolls, contacting the outer surface of the workpiece during at least a part of the rolling by the forming rolls. When the forming rolls have advanced to a predetermined depth of roll the force exerted by the growth control rolls on the outer surface of the workpiece is increased and the rolls continue to move towards one another until an adjustable dead stop is reached.