摘要:
Spiral forming methods can be used to join edges of a rolled material along a spiral joint to form conical and/or cylindrical structures. Alignment of the edges of the rolled material can be controlled in a wrapping direction as the material is being joined along the spiral joint to form the structure. By controlling alignment of the edges of the material as the edges of the material are being joined, small corrections can be made over the course of forming the structure facilitating control over geometric tolerances of the resulting spiral formed structure.
摘要:
An apparatus (50) for and method of manufacturing helically wound tubular structures (116) includes a rotating faceplate (74) upon which are mounted a plurality of diameter defining rollers (78) which, in operation, cause a strip material (80) to be plastically deformed into a helical winding which may be lain down in abutting or self-overlapping relationship to form said tubular structure (116).
摘要:
Disclosed is a process and apparatus for producing helically-seamed pipes of any cross-sectional shape. The pipe is produced from a flat strip of material marked at intervals that are a derivative of the circumference of the pipe. At least two sensors are arranged at check points along a paraxial line in order to identify any deviation of the marks from the axis and to generate mark-recognition signals. If the signals are emitted simultaneously, the circumference is constant, and if there is a time differential between the signals, correction is needed.
摘要:
A machine for forming helically wound pipes from a strip (15), having interengaging means on its longitudinal edges, in which a series of rollers (2 and 3) is positioned to form an annulus of rollers (2 and 3) arranged to curve the strip (15) to a helical form within the annulus with the edges of the strip (15) overlapping and means (18, 19) to press the interchanging means on the overlapping edges together to form a pipe (5), in which a pair of feed rollers (16, 17) remote from the means to press (18, 19) controls the rate of feed of the strip (15) to maintain the strip (15) between the feed rollers (16, 17) and the means to press (18, 19) in tension. A modification drives all of the rollers of the annulus synchronously.
摘要:
A method for forming helically wound pipe from an elongated sheet of material having a longitudinal axis wherein markings are provided perpendicular to said longitudinal axis adjacent the edges of the elongated sheet of material at predetermined spaced intervals. The elongated sheet is fed in a direction parallel to its axis and wound helically to form a helically wound pipe having adjoining revolutions while maintaining the distance, parallel to said longitudinal axis, between successive indicia adjacent the edge of one revolution and the indicia adjacent the edge of the adjoining revolution constant.
摘要:
A method of and device for producing multi-layer pipes by helically winding a plurality of bands loosely arranged one above the other, which are individually withdrawn from a supply, straightened out, trimmed, and in the form of a band loop are conveyed to the forming station at the respective angle of lead-in corresponding to the respective pipe diameter, whereupon the layers are together welded to form a pipe strand which is subsequently cut into individual pipes. All bands are supplied and advanced independently of the irregularities of the respective longitudinal band edge shape in steadily straight lead-in directions, and all band edges are machined together to a possible maximum width in coordination with each other whereupon the bands are driven together while the welding gap is controlled in conformity with their band edge shape merely by pivoting the pipe.
摘要:
A readily adjustable machine which continuously produces corrugated flexible metal tubing from very light gauge metal and of various diameters. A warping ring receives therewithin a longitudinally corrugated narrow strip of formable metal of light gauge and warps the same helically to produce convolutions by means of a helical warping surface which extends into one of the longitudinal corrugations. The size of the tube produced can be varied by merely substituting a warping ring of a different size. A uniquely shaped pair of die-forming rollers have lock-seam forming surfaces which are adjustable relative to each other to provide variation in the degree to which the seam will permit and withstand axial torque. The lock seam is constructed to be symmetrical about the neutral axis of the corrugation and about the slope line of the common corrugation leg of adjacent convolutions which it constitutes. The lock is provided by its radially extending deformations in its longitudinal medial portions and terminal portions, with intermediate portions therebetween extending at about 60.degree. thereto. The terminal portions extend around the bottoms of each of the U-shaped seam elements to further lock them in place. A flying saw automatically cuts off predetermined lengths of the tubing. The length of the sections to be cut may be varied by merely re-positioning a movable switch in the path of the tube. The tube has a unique lock-seam which is constructed to withstand greater flexing, greater axial twist and more stress without damage and without opening, and is stronger.
摘要:
An apparatus for use in the production of spiral-welded tubes or pipes, which comprises a triple roller bending system of a forming body including an outer guide roller device and an inner guide roller device. A first row of rollers is at least individually supported on a beam hydraulically adjustable in a substantially vertical direction on hydraulic cylinders. The adjustment of the displacement stroke of each of the cylinders is effected in such manner that a triple roller bending system is set in accordance with a previously determined relationship between oil pressure and displacement stroke.
摘要:
In the formation of helical seam welded steel pipe from strip material, variations in the strip material are recorded and compared with nominal values and, based on the differences between the actual and nominal values, the helical bending of the strip material is controlled to maintain the spring back force of the material within permissible limits.
摘要:
A machine for producing a large diameter tube from strip sheet metal material comprises a frame, a profiling station and a folding station. The frame comprises lower and upper rings which are connected to one another by vertical posts. The vertical posts carry supporting rollers, which are arranged in the form of a helix with a vertical axis. In operation strip sheet metal is fed to the profiling station where it is bent into a curve having a diameter equal to the required diameter of the tube and profiled so that subsequent turns can be slotted together. The strip is then fed to the folding station, which locks adjacent turns together. As the process procedes the tube being formed is supported by the supporting rollers by a flange formed by the folding operation.