Abstract: In a squeezing and chamfering device comprising a cylindrical frame, a chuck device provided at an end of the cylindrical frame for seizing a tubular material, a driving device provided at the other end of the cylindrical frame with an output shaft thereof extended in the cylindrical frame, and a slide holder secured to an end of the output shaft to be slidable in the cylindrical frame in an axial direction thereof, a squeezing die having a tapered inner bore engageable with the tubular material is detachable secured to the slide holder, and a chamfering portion is provided at an end of the inner bore away from the chuck device.

Abstract: An apparatus for forming tapered threads to a workpiece such as a pipe comprises a casing and a supporting member attached to one side of the casing, and three support plates rotatably attached to the supporting member. Roller members or cam members are secured to the support plates, respectively, to be rotatable with respect thereto and rolling dies are also secured to the support plates. The rolling dies are rotated by an electric motor through a power transmission mechanism. The workpiece is inserted into a space defined by the supporting dies to be subjected to the roll-forming operation.

Abstract: An apparatus for forming tapered threads on a pipe such as a gas pipe comprises a base table on which a chuck device for holding a pipe is mounted in an opposing relation to a casing also mounted on the base table. A rotary disc is mounted on one side of the casing to be rotatable and a plurality of, at least three, die supporting plates are pivoted on one side of a rotary member integrally formed to the rotary disc. A plurality of rolling dies detachably attached to the disc supporting plates, respectively, and the rolling dies are rotated through a power transmission mechanism operatively connected to a drive source.