摘要:
An apparatus for forming spiral steel pipe by separate type forming rolls which is characterized by stands carrying rolls for forming the inner and outer surfaces of the steel pipe, the stands being each split into two portions in a direction perpendicular to the axis of the steel pipe to be formed, one of the two portions being a fixed stand formed with a smaller length than the width of material plate for the intended steel pipe and the other portion being a stand movable in the axial direction of the steel pipe to be formed.
摘要:
A continuous band for use in making spiral seam tubes is made by horizontally aligning sheet metal plates in a common horizontal plane and clamping each adjacent end of the plates separately. A milling cutter is introduced in a slot formed between the adjacent transverse edges of these plates to trim and chamfer these two transverse edges simultaneously. Thereupon at least one of the clamping devices for clamping one of the plates is moved toward the other clamping device holding the other plate so that a welding joint is formed between the two transverse edges, which are then welded together.
摘要:
A method and apparatus for continuously producing spiral pipe from sheet material including feeding a strip of the sheet material into a spiral pipe forming machine, continuously deforming a portion of the longitudinal edges of the sheet material so as to bend the edge downwardly toward the axis of the formed pipe and out of the normal plane of the sheet material, forming the sheet material into a spiral tube and bringing the deformed edges into parallel face to face abutting relationship, welding the edges into a seam, and reforming the deformed portion of the sheet material to provide a smooth forged weld.
摘要:
A method for manufacturing load bearing structures, such as structural slabs or the like, from panels formed by tube sections extending parallel to each other and being connected together, each of which panels can be connected to at least one ply which may be provided with apertures, said ply covering completely or partially the front faces of all the tube sections lying in one plane.
摘要:
Pipe tracking apparatus and method and cutoff apparatus and method incorporating same, for pipe traveling longitudinally in a direction and rotating about its longitudinal axis. A tracking carriage mounts pipe engaging means having pipe engaging portions each adapted for engaging the pipe for a sustained interval. The carriage is moved a predetermined distance with the pipe at the rate of travel thereof in such direction, as the pipe engaging portions successively effect a pipe engaging relationship with the pipe. The carriage supports a pipe cutoff tool.
摘要:
A method for making bi-metallic pipe and a bi-metallic pipe are provided in which a strip of carbon steel having fixed thereto a strip of corrosion resistant metal of the same width is spirally wound into a pipe and welded with a first weldment in the corrosion resistant metal extending into the carbon steel and a second weldment in the carbon steel extending into the first weldment.
摘要:
Apparatus for producing tubing by welding helically formed metal strip comprises a mechanism for feeding the strip, a tube former which winds the metal strip helically to form the tube, a device for welding together the strip edges after it has been formed, a cutter for cutting the welded tube into lengths and a tube carrier for supporting these lengths of tube, the tube carrier being pivoted so that it can be swung to vary the angle between the axis of the formed tube and the direction in which the strip is fed, a receiver which receives the cut-off lengths of tube from the carrier and a conveyor for conveying the cut-off lengths from the receiver. The receiver is arranged so that each of the cut-off lengths of tube can be swung about the pivot axis of the tube carrier from a position parallel to the carrier and can also be swung about a second axis into a position in which each length of tube extends parallel to the conveyor which ten receives the tube and conveys it away.
摘要:
Apparatus of producing or testing with a welding or testing instrument welded spiral-seamed tubes formed of a steel band, which comprises rolling a steel band in a continuous spiral so as to form a rotating tube-shaped body; placing on the steel band at a constant spacing from an edge of the steel band extending toward a given welding location thereon, a premagnetized tape containing a ferromagnetic material adhering to the steel band and carrying a marking line disposed parallel to the edge of the steel band; sensing the marking line and regulating in accordance therewith the orientation of at least one of the welding and testing instruments with respect to the edge of the steel band so that the instrument and the given welding location are momentarily in registry as the tube-shaped body rotates; and withdrawing the premagnetized tape from the steel band after the steel band edge of the tube-shaped body has rotated past a second one of the instruments in the travel direction of the steel band edge; and apparatus for carrying out the method.
摘要:
Method of and apparatus for making spiral seamed laminated sheet metal pipe having a corrugated outer surface and a smooth inner surface. There is described a method which consists in denting the pipe in the region where seaming takes place and subsequently bringing the pipe to size and seaming between seaming rolls on a fixed mandrel, in this way to avoid large gaps at the inside of the seam and to maintain the pipe of substantially constant diameter.
摘要:
The apparatus for making helically wound, lock-seamed pipes of U.S. Pat. No. 3,122,115 is improved for use with heavier strip material by setting the axes of the pressure roller and flattening roller at an angle to the axis of the driven mandrel corresponding to the helix angle of the lock seam, by providing the strip engaging faces of the rollers with sharp edged ribs, and mounting the rollers so that the ribs bite into the strip, and by spacing the rollers apart along the seam by an angle of at least 360*.