Abstract: A device for bending ring segment-shaped plate blanks into conically shaped parts includes a pair of roll stands, a top roller, or a centrally positioned pair of top rollers supported between the roll stands, and a pair of side rollers positioned on either side of the top roller and also supported between the roll stands. Means are provided for driving the blanks between the top roller and the side rollers to form the conically shaped parts. At least one abutment member is carried by the device for engaging and guiding the short arc edge of the plate blanks. An elastic and adjustable counter pressure mechanism is connected to the abutment member so that at least a component of the bearing pressure on the abutment member is transmitted to the counter pressure mechanism for controlling the means for driving the plate through the rollers to form the conically shaped parts.