RU2072267C1 - Method and apparatus for manufacture of flexible metal pipes - Google Patents

Abstract

FIELD: plastic working of metals. SUBSTANCE: method involves subjecting ridge forming screen to deformation by longitudinal drawing; convoluting pipe to obtain coiled corrugated hose with outer screen made from profiled tape. Apparatus has conductor provided with at least three forming rollers positioned at both sides of ridge for displacement one relative to the other transverse to tape feeding direction. EFFECT: increased efficiency, simplified method and improved quality of pipes. 3 cl, 8 dwg

Description

 The invention relates to the processing of metals by pressure, in particular, to technology and equipment for the manufacture of flexible pipelines (hoses) with screw corrugation from a metal tape.

 Known flexible conduit made by winding a profiled corrugation tape into a corrugation [1] In this case, one end of the tape, made in the form of a flat ridge, departs from the top of the corrugation, overlaps the annular space formed by the adjacent corrugation cavity outside the pipe and creates a protective surface (screen) .

 Upon receipt of the sleeve [1] by winding the profiled tape according to the methods [2,3,4] with flanging in a bending stamp (forming head), there are certain difficulties. The fact is that during the convolution of the pipeline in the forming head, the tape is subjected to plastic deformation, and the part that is outside the middle line of the bend is stretched, and the other, the inner part, is compressed. The crest forming the screen is located in the material drawing zone, and, trying to avoid deformation, will deviate to the axis of the sleeve, as a result of which it will assume a conical shape instead of a cylindrical one. As a result, the crest will compress the previous turn, a gradual increase in the outer diameter of the pipeline, an increase in the friction forces in the bending die, and finally, a stop of the sleeve winding process.

 The closest technical solution, selected as a prototype, is a method of manufacturing a flexible metal sleeve from a tape [5] in which at the profiling stage a comb is formed in the form of a flat section at the end of the corrugated profile, and at the other end the groove, and at the folding stage at the clamping point turns of corrugation form a castle; wherein the lock is located on the outer surface of the corrugation, the most remote from the axis of the pipeline.

 A machine for implementing the described method [5] selected as a prototype of the device includes sequentially installed profiling rollers with output wiring, a bending stamp with supporting elements, as well as crimping and pulling rollers.

 The aforementioned method and device make it possible to use the tendency of the elements of the lock during convolution to deviate to the axis of the pipeline, thereby ensuring self-compression of the lock. However, they do not allow winding a sleeve with an external screen, since in the manufacture of the pipeline according to the patent [1], high stresses that cause the screen to crimp the corrugations of the sleeve lead to a halt in the process of winding it.

 The aim of the invention is to create a simple and reliable method and device that provides continuous folding of the profiled tape in a corrugated sleeve with the formation of a protective screen.

 This goal is achieved by the fact that in the method of manufacturing flexible metal pipelines from tape, which includes the step of profiling the tape to form a ridge at the end of the corrugated profile in the form of a flat section and the step of folding the resulting profile into a sleeve, unlike the prototype, the profiled comb is subjected to deformation before convolution by longitudinal drawing. The purpose of the invention is also achieved by the fact that in the device for implementing the inventive method, containing sequentially installed profiling rollers with lead-out wiring, a bending stamp with supporting elements, as well as crimping and pulling rollers, in contrast to the prototype, the wiring is equipped with at least three rollers, alternately located on both sides of the ridge and mounted movably relative to each other in the direction transverse to the movement of the profiled tape.

 Using the proposed method and device between the steps of profiling the tape and convolving it into a sleeve, the comb is preliminarily pulled in the wiring in additionally installed rollers. Then, during the convolution, it will take a position parallel to the axis of the sleeve, which will ensure stabilization of the winding processes and the formation of the outer screen.

 In FIG. 1 schematically depicts the inventive device illustrating the method, front view; in FIG. 2 shows a section through a forming head, section AA in FIG. one; in FIG. 3 shows a section of the wiring, section BB in FIG. one; in FIG. 4 shows the manufacturing process of the sleeve from the profiling of the tape to the convolution of the pipeline without profiling rollers, wiring and forming head, view B in FIG. one; in FIG. 5 shows an element of the finished two-layer sleeve, position 1 in FIG. 4; in FIG. 6 shows an enlarged image of the profile of the tape at the exit of the wiring, section GG in FIG. 4; in FIG. 7 shows an enlarged image of the profile of the tape at the entrance to the wiring, section DD in FIG. 4; FIG. 8 illustrates the principle of drawing the ridge of the strip profile by means of auxiliary rollers in the wiring.

 A metal tape 1 (Fig. 1) of thickness S, passing through a series of profiling rollers 2 installed in series, acquires a U-shaped (for a single-layer sleeve) or W-shaped (for a two-layer sleeve) profile 3 (Fig. 7), at one end of which there is a ridge 4 in the form of a flat section. The comb is designed to form a protective surface outside the pipeline and is separated from the corrugated protective surface outside the pipeline and separated from the corrugated profile 3 by a groove 5 adjacent to the radius of the future corrugation top. The length of the flat section 4 is chosen so that the edge 6 of the ridge during convolution is above the groove 5 (Fig. 5 and 7) and does not interfere with the bending of the sleeve in operation. The device (Fig. 1), in addition to the profiling rollers 2, also contains output wiring 7 and a bending stamp 8, which includes a mandrel 9 and a group of support rollers 10. A stamping roller 12 is placed on the stamp 8 using the bracket 11, which has a configuration corresponding to the outer surface pipeline profile. The support, crimping and pulling rollers 13 and 14 are installed at an angle Φ of the slope of the helical line of the corrugations of the sleeve. The wiring is provided with at least three forming rollers 15, alternately located on both sides of the ridge 4 (Fig. 8). While the rollers 15 are mounted with the possibility of moving relative to each other in the direction perpendicular to the movement of the profiled tape. For this, the rollers 15 (Fig. 3) are mounted on brackets 16 and 17 installed in the guide grooves of the upper 18 and lower 19 parts of the wiring 7. The movement of the brackets 16 and 17 is carried out using bolts 20 and 21. Finally, the wiring 7 in its lower part 19 contains a protrusion 22, which together with the rollers 23 directs and stabilizes the movement of the tape.

 The sleeve is made as follows. Of a given width, the tape 1 is profiled with rollers 2, giving it a U-shaped or W-shaped profile, and fed into the wiring 7, where its movement is stabilized by the rollers 23 and the protrusion 22. The forming rollers 15 of radius R are pre-set as shown in FIG. 8. Due to the fact that the length of the path L traveled by the ridge 4 in section X is greater than the length of the rest of the corrugated profile 3, tensile stresses will arise in the ridge that will lead to its longitudinal stretching. The degree of ridge drawing depends on the value of the parameter Y and can be expressed by the ratio.

где L функция параметров X, Y и R, т.е. L f(X, Y, R). Величину ε задают исходя из требуемого значения высоты профиля Н и диаметра рукава D по формуле

Найденную величину параметра Y выставляют на станке с помощью болтов 20 и 21. Удлиненный путем вытяжки гребень, выходя из формующих роликов, теряет устойчивость, приобретая волнистую форму, и в таком виде поступает на свертку. В гибочном штампе тянущие ролики 13 и 14 увлекают ленту во вращение вокруг опорных роликов 10, формируя таким образом рукав. При этом имеющий увеличенную длину гребень, в отличие от остальной части профиля ленты, в процессе свертки не деформируется. Однако волнистость его исчезает и он занимает положение параллельное оси рукава. Совершив полный оборот в опорных роликах 10, рукав переместится вдоль оси на величину шага Т и на него снаружи наложится поступивший из проводки 7 новый слой ленты, закрывая впадину предыдущего слоя и образуя защитный экран. Такой процесс будет идти непрерывно до окончания заправленной в станок ленты.

where L is a function of the parameters X, Y, and R, i.e. L f (X, Y, R). The value of ε is set based on the required value of the profile height H and the diameter of the sleeve D according to the formula

The found value of the parameter Y is set on the machine with the help of bolts 20 and 21. The ridge, elongated by drawing, exiting the forming rollers, loses stability, acquiring a wavy shape, and in this form enters the convolution. In the bending stamp, the pulling rollers 13 and 14 carry the tape into rotation around the support rollers 10, thereby forming a sleeve. Moreover, the crest having an increased length, unlike the rest of the tape profile, is not deformed during the convolution process. However, its waviness disappears and it occupies a position parallel to the axis of the sleeve. Having made a complete revolution in the support rollers 10, the sleeve will move along the axis by the step size T and a new layer of tape coming from the wiring 7 will be superimposed on it from the outside, closing the trough of the previous layer and forming a protective screen. Such a process will go on continuously until the end of the tape tucked into the machine.

 The proposed method and device allows simple and reliable production of flexible corrugated pipelines with an external screen, capable of long-term operation in harsh operating conditions under the influence of high levels of temperature and vibration.

Claims (2)

 1. A method of manufacturing flexible metal pipelines from a tape, comprising the step of profiling the tape to form a ridge at the end of the corrugated profile in the form of a flat section and the step of folding the resulting profile into a sleeve, characterized in that the profiled ridge is subjected to tensile deformation before folding.  2. A device for manufacturing flexible metal pipelines from a tape, comprising sequentially installed profiling rollers with lead-out wiring, a bending stamp with supporting elements, as well as crimping and pulling rollers, characterized in that the wiring is provided with a tensile assembly made in the form of at least three rollers staggered on both sides of the ridge and mounted movably relative to each other in the direction perpendicular to the movement of the profiled tape.

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