Abstract: To promote the forming performance of band material into pipes and to decrease the number of forming stages and changes of the forming rolls in the pipe mill, considering that it is superior when forming the band material into pipes of required diameters if the sectional shape of the band material is provided with a curved surface which changes its curvature continuously into the required diameter, we provide a curved roll surface of numerous curvatures changing continuously. In a continuous roll forming in accordance with the present invention, a forming roll having an approximate involute curve based upon a polygon comprising a plurality of sides is used. By using the conventional rolls in various combinations therewith in each stage of forming as a horizontal roll, side roll and upper intermediate roll or a cage roll, the number of stages of the forming roll can be reduced.

Abstract: The present invention is directed to a method and apparatus for forming seam welded tubes in which the positions of cage rolls are adjusted in accordance with the thickness, substance and size of a material to be formed into a tube in a process for forming a tube blank for a seam-welded tube by using cage rolls.

Abstract: In accordance with the invention, a roll forming machine is provided having a plurality of sets of rotatable opposed drive rollers having parallel axes with each set of drive rollers including at least one forming edge. Each set of drive rollers also includes at least one rotatable forming roller opposite a forming edge and having its axis in a plane defined by the parallel axes of the set of drive rollers. The angle between the axes of the drive rollers and forming roller of each set is increased incrementally in successive sets. The contact surface of the drive roller defines a right circular cylindrical surface. The contact surface of the forming roller defines a frusto-conical surface and preferably a right circular cylindrical surface.

Abstract: A roll forming apparatus has an elevatable base that is moved up and down by an elevating mechanism. Carriages are movably mounted on the base on both sides of a forming pass line. Each carriage carries several side rolls that are disposed along the forming pass line. A pair of side roll position adjusting mechanisms are coupled to each carriage. The pair of side roll position adjusting mechanisms move a carriage back and forth to form the desired forming pass. An elevating mechanism is provided to move up and down the base so that the level and inclination of the forming pass line is set as desired.

Abstract: A seam lock spreader formed by providing a spreader wheel carrier adjustably attachable to the spindle of a conventional combination rotary machine and attaching also to the machine a pair of rollers especially shaped for driving sheet metal while providing a space for receiving its seam. The rollers are of a special size for fitting the combination rotary machine.

Abstract: The device comprises several sets of shaped rollers disposed on parallel circumferences. The rollers of one of said sets are gauged and innerly define a circumference the diameter of which is equal to that of the cylindrical box-shaped elements to be shaped. In order to ensure a perfect welding of the cylindrical box-shaped elements, some of the gauged rollers are powered at a constant speed. These powered gauged rollers mesh with each other by means of their respective toothing and only one of them is powered by a powered toothed belt which moves the welded box-shaped elements away from the shaping device.

Abstract: A transition forming unit is provided for forming a strip of U-shaped cross-sectional configuration into a generally annular shaped cross-sectional configuration. The forming process is performed by a plurality of roll assemblies adjustably mounted on a pair of spaced longitudinally extending beams, one disposed on each side of the longitudinal axis of the forming unit. The beams are adjustable in respect of the longitudinal axis of the forming unit. A hold down assembly is provided for controlling the alignment of the U-shaped strip as it passes through the forming unit. The roll assemblies are mounted on each beam to absorb thrust loads produced during the forming process.

Abstract: Forming rolls of a tube-producing apparatus comprise an upper roll having two identical roll parts supported at spaced-apart positions on a roll shaft, each roll part having a rounded outer circumferential working surface which, as viewed in section taken along a plane passing through the rotational axis of the roll, has a rounded convex profile shape of mutually different inner and outer radii of curvature on inner and outer sides of the profile centerline perpendicular to the axis, the working surface portion of the outer radius operating cooperatively with the outer portion of a lower roll to form the lateral portion of a strip metal plate passed therebetween. Each upper roll part can be turned around in orientation on the roll shaft to place the working surface of the originally inner radius on the outer side, thereby changing the gap between the upper and lower rolls to suit the wall thickness of the tube being produced.

Abstract: A flat skelp is longitudinally fed through convex and concave horizontal rolls, and is edge-crimped so that both edges are curved inward symmetrical to the pass line. The edge-crimped skelp is forced through a plurality of cage rolls disposed along and symmetrical to the pass line. The cage rolls perform intermediate forming that shapes mainly the uncrimped portion of the skelp toward a round form symmetrical to the pass line. The nearly rounded skelp is then subjected to finish-forming, with the fin of a finned-roll inserted in the gap between the edges. The edge-crimping process includes two or more stages; bending the outermost edges of the skelp and subsequent bending of the inward portion adjacent to the first bent edges.

Abstract: A game racket includes a generally oval head section and a handle section extending from the head section. A plastic brace is secured in the head section to complete the ovality of the head section. A hand grip is fixed to the handle section. The head section and the handle section are constituted by a tubular titanium strip which is provided with a Vickers hardness of 150 to 220.

Abstract: A metal pipe forming mill progressively forms a flat metal sheet into a circular form along the mill axis by forming rolls including pairs of cage rolls. A cage-roll unit in this type of mill has a pair of movable bases disposed on both sides of the mill axis, with the space between the two movable bases being freely adjustable, and a pair of stands mounted on the movable bases, one on each. The stands rotatably support, on their surfaces facing the mill axis, two or more pairs of cage rolls, one pair following another along the mill line.

Abstract: A cold-roll forming stand for forming a flat metal strip into a desired section which includes a pair of upper and lower forming rolls for forming the metal strip lengthwise; a pair of intermediate longitudinal forming rolls for bending or curving the metal strip widthwise are mounted on intermediate vertical shafts, a pair of front longitudinal forming rolls mounted on vertical shafts upstream of the pair of intermediate longitudinal forming rolls and a pair of rear longitudinal forming rolls are mounted on vertical shafts downstream of the pair of intermediate longitudinal forming rolls, whereby the metal strip is subjected to the bending and/or curving lengthwise by the pair of upper and lower forming rolls and widthwise by the front, intermediate and rear pairs of longitudinal forming rolls.

Abstract: In a method and an apparatus for manufacturing a metal pipe wherein a flat strip or skelp is formed into a cylindrical pipe while being fed in its longitudinal direction by a forming mill having a prefinishing stand, a train of forming stands for forming the skelp with a U-shaped cross section, and a train of finishing stands, the improvement wherein both edge surfaces of the skelp are caused to contact in substantially point contact recess-defining surfaces of concave V-shaped recess in pairs of forming rolls, the respective rolls which are disposed symmetrically in a plane normal to the pass line as the skelp moves through the train of forming stands along the line, and the skelp has a bending load applied by the forming rolls so as to form the skelp into a U-shaped skelp.

Abstract: Apparatus for automatically cutting sections of measured length from a coil of an elongated strip which has a rotatable mounting device for the coil, a feed and straightener driven at a constant speed for pulling the strip from the coil, a hump table, a speed control unit with a pair of pinch rolls, a shears, and a device for generating a first signal when the leading edge of the trip has been transported past the shears by a distance equal to the length of the measured section for breaking the pinch rolls to stop movement of the strip at the shears and for actuating the shears, said device also generating a second signal when the leading edge of the strip has been transported past the shears by a shorter distance than the measured length of the section for actuating a pneumatic cylinder to drive the pinch rolls toward each other and grip the strip, the lower pinch roll being driven by a constant speed motor at a cicumferential speed less than the speed of the strip from the feeder, thus producing a hump betw