Abstract: A skew rolling mill has three taper rolls, inclined at an angle to the axis of the rolled stock and offset relative to each other by 120.degree.. Each taper roll is driven through a bevel gear pair, intermediate shaft, intermediate gear and a planet gear, from a sun gear disposed on a rotatable hollow shaft. The roll and its drive are combined by means of a casing into a roll head. The casings are rockers which can pivot along the end face of the roll support and have pivot axes disposed outside the axes of the intermediate gears, in or near the common plane of the axes of the associated intermediate gear and planet gear. These pivot axes can be adjusted to a small extent in a guide extending perpendicularly to the common plane.

Abstract: A supply of elongated metal tubes are successively transferred laterally to and from a reducing position aligned with the axis of a hollow spindle, and one end of each tube is clamped by a gripper mechanism mounted on a carriage supported between two vertically spaced horizontal lead screws. Each tube is fed by the carriage onto a non-rotatable mandrel located within a non-rotatable guide tube supported within the spindle. The mandrel is supported by a mandrel rod and a centering cone movable axially on the rod within the guide tube, and the mandrel is positioned within a zone where a set of shear forming wheels are orbited around the metal tube by an annular forming head supported by the spindle. While the head is rotating, the orbiting forming wheels are movable radially in response to movement of an eccentric cam mechanism operated by an actuating tube carried within the spindle.

Abstract: An improved machine for forming a plurality of thin, spiral grooves in the inner surface of a metal pipe. A grooving plug is inserted and held in the metal pipe in such a manner that its axial position is constant and the metal pipe, while being moved longitudinally, is pressed by a plurality of balls which rotate planetarily around the outer surface of the metal pipe at a position corresponding to the position of the grooving plug to continuously form a plurality of spiral grooves in the inner surface of the metal pipe. Thereafter, the metal pipe is finished through a die. The machine manufactures at a high rate metal pipe which has a smooth outer surface and a grooved inner surface.

Abstract: A heat transfer surface for nucleate boiling of liquids is formed on the outer surface of a heat exchanger tube. Helical ridges having two fins each encase the tube. A fin at each ridge is angled toward the adjacent fin on the adjacent ridge forming a gapped cavity therebetween. The method of making the tube includes rolling alternating deep grooves and shallow grooves in the outside surface of the tube and then flaring the fins to form the gapped cavity.

Abstract: A method of and apparatus for forming spirally-shaped indentations in tubular products. An internal shaft is formed with a spirally-shaped female die and an outside die consists of a single metal ball magnetically suspended from the outside die holder in registry with the spiral formation on the internal female die. The tube to be formed extends between the two dies and is clamped to prevent rotation but permitted to move in either axial direction. A threaded insert in the external die is advanced axially and then locked to predetermine the maximum indentation to be impressed into the tubular product. Thereafter, a reversible motor drives a holder for the external die and the internal shaft in unison to form a spiral indentation in the tubular product.

Abstract: The invention provides for a method of and an apparatus for manufacturing finned tubing from tubular metal fin stock in which the fin stock is in axially continuous form. There are provided at least two finned regions on the fin stock between which there is interposed at least one finless region. A plurality of rollers are employed which are drivably mounted on arbors spaced about the fin stock. Each roller includes a plurality of axially arranged forming discs, the discs on the arbors tracking each other in axially spaced groups, and the diameters of the forming discs in each tracking group on the arbors having different diameters. The fin in a finned region is developed to its full height over an axial distance of the fin stock equal to from 0.40 to 0.75 of the outside diameter of the fully developed fin.

Abstract: The present invention is used in continuous casting machines where a billet is withdrawn from a mould and simultaneously rotated about its own axis. The invention provides a withdrawal roll unit that has withdrawal rolls mounted on oscillating levers or housings cantilevered on a rotating cage. The levers, with the withdrawal rolls, are located in a plane perpendicular to the axis of rotation of the cage. The ends of the levers are connected in series one to another. In one embodiment, a second end of each lever or housing is connected by an elastic element to a first end of an adjacent lever which, in turn, is secured to the cage.

Abstract: The tapered working roller of a skew rolling mill is provided with a deformation surface in the form of a paraboloid and a smoothing surface at the end of smaller cross-section in the form of a technical hyperboloid.

Abstract: An inclined rolling stand for reducing a starting material to a pipe or rod, which includes a roll carrier adapted to be driven and to permit a central passage of the material to be rolled. The roll carrier includes three conical substantially identical and axially adjustable working rolls which are adapted to be driven and are inclined relative to the rolling axis at the same acute angle. The three working rolls are offset relative to each other around the rolling axis by 120.degree. and are so directed with regard to the rolling axis that their extended axes respectively cross the rolling axis at the same short distances while the narrow ends of the conical working rolls respectively include a smoothing zone representing a surface of rotation about the axis of the respective working roll.

Abstract: A device for the cold rolling of narrow flat lands on the cylindrical surface of heat exchanger tubing, just prior to the winding onto the tubing of one or more metal strips for the production of finned tubing, the device having pressure rollers on pressure levers carried by a journalled supporting spindle which rotates with the tubing, and a control sleeve inside the hollow spindle which, under the action of a linear actuator, interrupts the rolling action as desired, while the winding operation continues.

Abstract: This invention concerns finned tubes for use in heat exchanging whereby the fins have a generally T or Y shape. There is disclosed process and apparatus for making these Y and T-finned tubes whereby a smooth tube is subjected to conventional rolling process with the ends of the fins being subsequently notched into Y-fins and, if desired, subsequently flattened into T-fins. According to other embodiments of the invention the T-fins are constructed by an apparatus including an oblique surface which contacts the conventionally constructed fins causing the fins to be flattened into a general T shape.

Abstract: A skew rolling mill is provided with a deforming smoothing means in contact with the stock immediately beyond the working rollers to remove markings. The deforming means is supported in a support which rotates about the axis of the stock.

Abstract: There is disclosed a rolling mill comprising a pair of generally discus shaped rolling heads affording opposed rolling surfaces, the rolling surface of each head being provided by its surfaces inclined at a substantial angle to the axis of rotation of the rolling head, the rolling heads being mounted so that their axes of rotation are in parallel planes spaced apart from one another, the axes of rotation of the rolling heads being inclined to one another, and drive means arranged to be capable of rotating the rolling surfaces of the heads in opposite senses relative to each other and at different speeds.

Abstract: A working roller for a skew rolling mill which has the shape of a truncated cone is provided with internal passages for circulating a heat transfer medium therethrough to thereby control the temperature of the working surface of the roller.

Abstract: A skew rolling mill is provided with only two working rollers offset from each other by 180.degree.. Restraining elements are provided between the rollers to prevent lateral bending of the stock being rolled.

Abstract: A method of fabricating seamless tubes of malleable metal is provided comprising supporting an annular work piece of greater wall thickness than the required thickness of the completed tube within a die ring in encircling engagement with its outer surface and applying an axial pull to one end of said work piece to draw it axially through said die ring while simultaneously rolling the interior of the work piece with a forming tool having a plurality of centrifugally loaded rollers so as to enlarge the internal diameter and lengthen the work piece axially in the direction of said axial pull.

Abstract: The wire pointing machine comprises two grooved rolls which are supported in a gear ring pivotable about a horizontal axis. Teeth are provided on end trunnions of the grooved rolls which mesh with a common gear rack which is directly powerdriven.

Abstract: An apparatus for forming corrugations of "zero" pitch in coaxial cable includes a takeup drum which pulls the coaxial cable through a three jaw chuck or head at a speed related to the rotation of the head. The head includes three forming dies and three synchronizing gears which cooperate with the forming dies to synchronize movement of the forming dies for movement about the cable. By causing the takeup drum to pull the cable through the head at a predetermined rate, the forming dies cut parallel corrugations or "zero" pitch grooves in the cable jacket.

Abstract: Method of producing bright steel from rolled steel wire, in which the diameter of the rolled wire is first reduced by passing the same through a calibrating device, preferably a reducing mill, whereby internal stresses assymetrical with respect to the wire axis are produced in the wire, thereafter removing peripheral surface portions from the wire and subsequently straightening the wire, and subjecting the wire before removing peripheral surface portions therefrom to a radial bending force rotating about the axis of the wire to plastically deform the latter to thus reduce the assymetrical internal stresses to thereby improve the perfect roundness of the finished product.

Abstract: The specification discloses a self-compensating die in which a plurality of roller sets mounted in a rotating rotor rotate about a wire passing through the rotor and compressively engage the wire to thereby reduce its diameter. A sleeve rotatable with the rotor but axially slidable with respect thereto includes cams which control the roller sets in response to adjusting signals from a control system to thereby automatically compensate the roller pressure applied in response to roller wear and other errors, and to thereby provide a means for adjusting the die for production of different sized wires from a wire of a given starting diameter.