Abstract: A three-roll-type reducing mill including three forming rolls brought into contact with an outer periphery of an electro-resistance-welded steel tube for reducing its diameter. Two left and right sliding brackets respectively mounted with two follower forming rolls are sidden symmetrically with respect to a center of a main forming roll and simultaneously only by rotation of a single adjusting screw shaft, thereby enabling the diametrical reduction of the steel tube to be adjusted on-line and speedily.

Abstract: A tube forming machine for making a tube from a sheet is disclosed. The forming rolls of this invention include various V-shaped rolls at least some of which are used as part of a three-point bending technique. The three-point bending technique entails the use of a V-shaped bottom roll and a narrow top roll. The sheet is shaped running the sheet through a gap between the narrow top roll and the V-shaped bottom roll. The technique allows a wide variety of tubing to be made from the same set of forming rolls, because the curvature obtained in a sheet can be varied by opening or closing the gap. A V-shaped forming roll disclosed herein is also used at a pinch roll stand with a second complementary V-shaped roll. The pinch roll stand of this invention creates an initial V-shaped sheet which facilitates the threading of the sheet at the start of a forming operation. Brimmed rolls are also disclosed.

Abstract: A forming stand for continuously forming a skelp material into a pipe, by pressure of spaced-apart forming rolls supported by spaced upper and lower shafts, the forming rolls having two portions, with one portion fixedly fitted on one side of its shaft, a sleeve slidably fitted to the other end of the shaft and fixedly secured to the sleeve and slidable with respect to the shaft; a bearing box for supporting one side of the associated shaft; a bearing box supporting the other side of the associated shaft through the sleeve; upper and lower stand supporting frames for supporting both of the bearing boxes to be movable in an axial direction; and supporting columns for supporting the stand supporting frames; the pipe-forming force is continuously measured and the forming operation is adjusted such that the measured value of pipe-forming force does not exceed a predetermined pipe-forming upper limit.

Abstract: A forming stand for continuously forming a skelp material into a pipe, by pressure of spaced-apart forming rolls supported by spaced upper and lower shafts, the forming rolls having two portions, with one portion fixedly fitted on one side of its shaft, a sleeve slidably fitted to the other end of the shaft and fixedly secured to the sleeve and slidable with respect to the shaft; a bearing box for supporting one side of the associated shaft; a bearing box supporting the other side of the associated shaft through the sleeve; upper and lower stand supporting frames for supporting both of the bearing boxes to be movable in an axial direction; and supporting columns for supporting the stand supporting frames; the pipe-forming force is continuously measured and the forming operation is adjusted such that the measured value of pipe-forming force does not exceed a predetermined pipe-forming upper limit.

Abstract: An apparatus for manufacturing a welded pipe. The apparatus includes a cage or cluster roller molding system. In either case, a rotary axis of each roller is slanted counterclockwise or clockwise with respect to a manufacturing line direction of the apparatus. The adjustable positioning of the rotary axis reduces vertical slip caused when the strip of material passes along the contact surface of the roller.

Abstract: In welded pipe manufacturing a steel strip is fed and bent by forming rolls into a pipe. A load detector is provided for a roll rotary shaft of each forming roll; a forming roll inclination adjustment device inclines the roll rotary shaft. The roll shaft load is measured to cause inclining of the rotary shaft counterclockwise or clockwise on a plane formed by the rotational axis of the forming roll and the advancing direction of the steel strip.

Abstract: A tubular shape finishing apparatus in a steel pipe manufacturing system which molds band steel in a tubular shape while passing through a plurality of sets of forming roll stands and welds the butt portion by a seam welding unit, the tubular shape finishing apparatus welding the pipe by a seam welding unit, cutting off padding by a bead cutter, finishing and shaping the same into a shape of a desired diameter, and to be about an complete round, and comprising one or two of 3-roll forcible drive type stand or 3 or more roll forcible drive type stands disposed in series.

Abstract: A clamp mechanism in a travelling cutting machine for a steel pipe, in which a clamp open-close wedge provided with a biasing spring is mechanically operated using a cam system in association with vertical movement of a lifting base plate, thereby minimizing a time lag between the operation times, and in which a lower front blade, an upper blade passing-gap adjusting member and a lower rear blade are made into an integral component, thereby easing exchange of the blades.

Abstract: A weld bead cutter mechanism continuously planes weld beads projecting from the seam weld zone of an electric seamed steel pipe. The weld bead cutter mechanism fits into an assembly line for manufacturing electric seamed steel pipe right after equipment which continuously molds sheet metal and welds the seam. The weld bead is planed off from the steel pipe by a planing blade, bent by a guide shoe fixed to the planing blade holder, and automatically guided through a groove in a bead guide to a rotary bead chopper. The weld bead is then chopped into small pieces as the rotary bead chopper chops it against a stationary blade. The distance between the planing blade and the rotary bead chopper is minimized by the use of the guide shoe and bead guide, which ensures a stable weld bead movement. The weld bead cutter mechanism operates without requiring manual guidance of the weld bead, which greatly reduces the risk of a labor accident.

Abstract: A traveling pipe cutter which includes an upper blade and a lower blade mounted on a blade holder such that the blade holder moves in response to a crank mechanism to cut the pipe with every one-cycle motion of the crank. The clamp which holds the pipe during the cutting process also serves as the blade guide for both the upper and lower blades.

Abstract: A continuous manufacturing method for a metal welded tube and a manufacturing apparatus therefor, which obtains a tubular member by continuously passing a metal band coil through molding rollers, guides the tubular member to abutting rollers to bring the edges thereof in slight contact with each other so as to form a V-throat having the vertex of an edge contact portion at the upstream side of the abutting rollers, disposes an inductor of a high frequency preheating unit aiming at edge preheating at the outer periphery in front of the abutting point of the V-throat and at need disposes an impeder also at the inner surface of the V-throat, and further disposes welding torches in a single or double rows of a welding unit for melting and welding the tubular member by welding high density energy at the upstream side of the abutting rollers including the line connecting the centers thereof.

Abstract: An apparatus for cutting tubing to predetermined lengths while the tubing is being produced. The apparatus includes a cutting or shearing assembly comprising a die-set which having a cutting blade. The die-set is translated to a velocity which matches the line velocity of the tubing as it is produced. A press assembly acutates the cutting blade. The apparatus has a controller which calculates the maximum cutting time available, and the press assembly is instructed to rotate at the slowest rate possible, depending upon the line velocity. By causing the cutting blade to move as slowly as possible through the tubing, the life of the cutting blade is prolonged.

Abstract: The invention is embodied in a tube cutting station in a tube producing mill. The cutting station includes a rotating press assembly and an axially moving cutting assembly. The cutting assembly is accelerated axially to a velocity which matches that of the tubing being produced. Once the cutting assembly reaches the same velocity as the tubing line, the press assembly can cause downward movement of a cutting blade through the tubing. The press assembly of the present invention is alternately rotated in opposite directions to maximize the rotational extent and time available for acceleration and deceleration of the press assembly, and therefore enables the use of lightweight drive motors. Slower acceleration and deceleration also reduces wear on components used to drive and stop the press assembly.

Abstract: An apparatus for continuously producing electric-welded steel pipes by continuously supplying coiled strips as connected to one another by welding, progressively forming the strip into a tubular shape and high-frequency welding the opposed edges of the strip to form a seam. To produce required small quantities of steel pipes having varying diameters and wall thicknesses, a group of roll assemblies is replaceable by another group within a short period of time. Groups of forming, welding or sizing rolls are mountable on a polygonal bed which is lockable in position after rotation. For replacement, the bed is rotated by a hydraulic motor to bring the desired group of rolls to the proper position quickly.

Abstract: An apparatus for use in a tube manufacturing plant wherein a coiled strip is made into a continuous tube. The tube is fed to the apparatus at a given speed and severed into a specified length with minimized errors in accordance with the contemplated use by a cutting assembly traveling in synchronism with the feed of the tube. When the speed of the cutting assembly matches the speed of the tube, a ram is lowered from above by a crank assembly to cause a notching blade and a cutoff blade to cut the tube without dimples. The ram is elongated and supported by a plurality of crankshafts which are adapted for synchronous rotation optimally by a synchronizing link. For dimpleless cutting, the notching blade is revolved and thereby moved at an increased speed to form a deep and wide notch in the tube.