A method of manufacturing a multilayer pipes
(57) Abstract:Usage: metal forming, the production of multilayer pipes with capillary channels. The inventive method comprises a coaxial Assembly of layers of different diameters and their subsequent drawing. As layers are used longitudinally of the workpiece by the laser welding seam width equal to k h, where k = 0,3 to 1,1, h is the wall thickness, while the inner layer before Assembly is subjected to drawing with deformation rate of 40... 90% and use in cold-worked condition. Layers sochinyayut sequentially, by drawing with eliminating gaps between the layers, and the degree of deformation of each layer is determined from the expression % = A (100SK + 4) , where K is a numerical factor that determines the width of the bead; S - the numerical equivalent of the magnitude of subsidence seam of the workpiece by the laser welding, a is a coefficient depending on the assortment of pipes and equal ( 0,9...1,3 )%. table 2. The invention relates to pipe manufacture and can be used in the manufacture of multilayer pipes.In connection with intensive development engineering is constantly growing importance of the manufacturing isobutylester pipes of small diameter with znachitelnoi as determined by the surface quality and dimensional accuracy of the specified channel.To provide for the increasing demands in the manufacture of pipes with internal diameter of less than 1.5 mm by known methods is difficult or impossible.The number of known methods for the production of multilayer pipes, including seamless pipe Assembly-blanks and their subsequent drawing or hand.The closest in technical essence to the present invention is a production method of a multilayer, in particular the double-wall pipe, comprising a coaxial Assembly of seamless tubular blanks and their joint drawing for the purpose of eliminating gaps between them.Common drawbacks of these methods is the inability to manufacture pipes with capillary channel high quality and mnogochislenost and complexity of manufacturing seamless pipe-layers.The aim of the invention is the provision of opportunities for making isobutylester pipes with capillary channel (0,2...2 mm) increased quality while reducing the complexity of the process.This objective is achieved in that in the known method, including coaxial Assembly of layers of different diameters and their subsequent drawing, as layers using longitudinal C is Ni layer before Assembly is subjected to drawing with deformation rate of 40...90% and use in cold-worked condition, and layers sochinyayut consistently performing drawing by eliminating gaps between the layers, and the degree of deformation of each layer is determined from the expression:
% = A (100 S K + 4) where K is a numerical factor that determines the width of the bead;
S - the numerical equivalent of the magnitude of subsidence seam of the workpiece by the laser welding;
A is the coefficient dependent on the assortment of pipes and equal (0,9...1,3)%.The proposed method is as follows.For welding workpieces pipe-layers use a tape with a thickness of 0.20...1.00 mm stainless steel type HT, 08KH18N10T, 12H18N9, 20X13 (for example, GOST 4986-79). The specified thickness range is optimal, since the thickness of the tape is less than 0.20 mm, it is impossible to form a laser weld width less than the thickness of the wall due to the limits of technical feasibility compression of the laser beam (used laser type installations LTN-103, RS 500, RS-1200, "Comet", "Lantana", "Hop-25", "quantum", "TL-1,5", "Mandarin") up to a diameter of less than 0.20 mm, that is, the seam may not be already diameter of the laser beam. When the thickness of the tape is more than 1.00 mm becomes uneconomic moulding process pipe diameter...7,0 6,0 mm diameter to wall thickness less than 6. To perform laser seam width is eljnosti, as well as inadmissible technologically, as excessive talovlozheny seam has a coarse grain and reduced mechanical properties. An important parameter of a welded joint for subsequent cold deformation and quality multilayer pipes is the height of the seam. As the platen gain (Burr) on the blanks are invalid under the terms of the lug and the junction pipe-layers, the laser welding seam is formed along the height of the depression, that is less than the wall thickness 3...15%, by profiling the strip edges (performance bias) or by Assembly joint with a specified gap between the edges (both uniform and nonuniform thickness of the wall). Sagging of the weld is less than 3% of the wall thickness is difficult to maintain due to the variation of the gap between the edges during welding (i.e., when conditions change, the Assembly of the junction), resulting in some places cushions gain. The seam subsidence of more than 15% of the wall thickness of the workpiece is inadmissible under the terms of the subsequent drawing of pipes, as selected deformation modes will not occur thickening of the suture to the level of the wall thickness that is the reason for rejection of the pipe. Laser welding is performed at a speed of movement of the pipe 0,30 5,00...m/min at a power ish">Possible options joints of pipe-layers are presented in table. 1.A very significant element of the proposed method of manufacturing a multilayer isobutylester pipes is the preparation of the inner tube. With the aim of improving the durability of the developed methods of making isobutylester pipes with hardening of the inner surface nitriding, heat the outer surface and internal cooling, internal Hydrogenium. In the proposed method specified hardening channel is more cost-effective and efficient way by using an inner layer of the capillary pipes of required size with a given degree of hardening, reached a preliminary drawing - ProcNum and besprobochnym. As the experiments showed, the rational range of the degree of hardening of tubes of stainless steels is within ab= 1000...1700 MPa and corresponds to the degree of deformation 40...90%. The proposed method can be obtained multi-layer high-strength pipes with capillary channel sizes 4,5...7 CVI. 0,2...2 mm Number of layers is within 3. ..5. The thickness of the inner layer is 0.13...0.3 mm, the rest of 0.3. . .1 mm Number of layers and their oami with a minimum periodicity of production.The calculation of the deformation modes of the layers in the drawing the above formula showed her a satisfactory convergence with the practical results. In General, the range of the degree of deformation is in the range of 4...20%, while increasing subsidence seam S necessary degree of deformation increases, which provides the required thickening of the wall in the spot weld and the receiving layer with a uniform wall thickness around the perimeter.It should be noted that a greater wall thickness (see table 1), the greater the possible subsidence of the walls, of greater importance And, under the terms of laser welding - less numerical factor K, which determines the width of the bead.As an example, below is an example of the calculation of the required degree of deformation of the layer with the drawing on the proposed formula .The pipe-layer - size 6 x 1 mm steel 12X18H10T
The amount of sagging of the weld (see tab. 1):
S = 0,15 h = 0,15 1 mm = 0.15 mm
Factor K = 0,65
A = 1,3%
= 1,3 (100 0,15 0,65 + 4) = 17,87 18%.During tests of the method were made of five-layer pipe size 6 x NR 1 mm of steel 12X18H10T sizes of pipe-layers (counting from the inner surface of the pipe): 1,4 x 0.2, 2 x 0.3, 3 x 0.5, 4.5 x 0.75 and 6 x 0.75 mmIt should be noted that to resolve the resulting depression was enough to make drawing with the reduction with the degree of
= 0,9 (100 0,01 1,1 + 4) = 4,59%.However, for the desired hardening of the inner layer and the receiving channel of the pipe with high surface quality and accuracy of the drawing is first carried out without intermediate heat treatment to become automatically self-centering mandrel, and then, without mandrel-route:
3 x 0,25 ->> 2.3 x 0.2->> 1.8 x 0.2->> 1.4 x x 0.2 mm, with the total deformation= 65%. For welding layer 11 used a tape thickness of 0.3 mm, the Width of the seam when it was h1= 1 to 0.3 = 0.3 mm; the amount of sagging of the weld: S = 0.05 x 0,3 = 0,015 mmRational degree of deformation in this case is:
= 1,1 (100 0,015 1 + 4) = 6,05%
Considering the above the workpiece by the laser welding were made size 2.10 x 0,3 mm specified In the workpiece has entered the pipe layer 1 size of 1.4 x 0.2 mm and conducted joint drawing with a nozzle layer 11 to layer 1 (size 2 x 0.5 mm). The degree of deformation of the upper soybeans were $ 6,85 0,5 = 0,425 mm; subsidence seam: S = 0,4 0,5 = 0,02 mmThe necessary degree of deformation in this case is:
= 1,1 (100 0,02 1 + 4) = 6,6%.A pipe-blank for the manufacture of the third soybeans received laser welding size 3,17 x 0.5 mm, Then the specified pipe has introduced a two-layer pipe size 2 x 0.5 mm and was jointly carried out by drawing on the size 3 x 1 mmFor the manufacture of layer IV used the tape with a thickness of 0.75 mm, joint width is h1= 0,6 0,75 = 0.45 mm; subsidence seam S = 0,05 0,75 = 0,037 mmThe necessary degree of deformation during wire drawing is
= 1,2 (100 0,037 0,6 + 4) = 7,46%.Specific to the strain produced billet size 4,80 x 0.75 mm, introduced a three-layer pipe size 3 x 1 mm inside the specified workpiece and implemented drawing on the size of 4.5 x 1,75 mm, For the manufacture of layer V used a tape thickness of 0.75 m, respectively, the values of the width of the seam, subsidence, and deformation during the landing layer V on a four-pipe similar to the values obtained in the calculation of the parameters of layer IV. The pipe size of the workpiece based on the specified were: 6.42 per x 0.75 mm In the specified workpiece has introduced a four-layer pipe size 4.5 x 0.75 mm and implemented a joint in which the destination is within 0.02 mm, the inner surface roughness corresponded Ra 0,5...0,7 μm, the tensile strength of the metal pipe internal soy ran up to 1200 MPa. The manufacture of such pipes by known methods is not possible.The data validation process parameters are given in table. 2.Analysis of the data demonstrates the effectiveness of the use of the selected parameters of the manufacturing process of multilayer pipes with precision capillary channel. When the deviation beyond the rational limits the quality of pipes and process stability decreases dramatically. In particular, for small deformations (less than 40%) of the inner layer, taking into account the capillary channel becomes impossible for him otpravochnaya calibration, thus reducing the accuracy of the channel and increases the surface roughness. When exceeding the recommended degree of deformation (90%) due to low plasticity there are cases of fracture of the inner Sol. With exorbitant small amount of subsidence (S < 0,03 h) not possible formation of external or internal grata (roller amplification), in excess of the permissible magnitude of subsidence (S > 0,15 h) in place of a seam formed film, etc.The developed method allows manufacturing the CSOs quality in diameter, for example 0.2 to 1 mm, which in a known manner to obtain not possible. A method of MANUFACTURING a MULTILAYER PIPE comprising an Assembly coaxially installed layers of different diameters and their subsequent drawing, wherein, with the aim of ensuring the possibility of manufacturing isobutylester pipes with capillary channel, improving the quality of the pipes while reducing the complexity of the production process, as layers using longitudinal tubular workpiece by the laser welding seam width equal to K h, where K = 0,3 - 1,1, and h is the wall thickness, mm, while the inner layer before Assembly is subjected to drawing with deformation rate of 40 to 90% and use in cold-worked condition, layers were combined sequentially, by drawing with the elimination of the gap between the layers, and the degree of deformation and each layer is determined from the expression
= A (100SK + 4) , % ,
where K is a numerical factor that determines the width of the bead;
S - the numerical equivalent of the magnitude of subsidence seam of the workpiece by the laser welding, equal (0,03 - 0,15) h, mm, where h is the wall thickness of the workpiece;
A is a coefficient depending on the assortment of pipes, 0.9 to 1.3%.
FIELD: plastic working of metal.
SUBSTANCE: clamping-tool device 29 in the form of tongs for placing mechanic fixing organs includes first member for placing, limiting and (or) measuring path portion, length or distance at arranging fixing organ; second member for placing, limiting and (or) measuring at least one component of effort created at moving or overcoming path portion in fixing organ or by means of fixing organ.
EFFECT: enhanced quality of assembling process.
9 cl, 9 dwg
FIELD: machine engineering, namely joining of constructional members of articles, for example flexible members and tips.
SUBSTANCE: method comprises steps of changing shape and size at least of one of joined members at using forces of interaction of electromagnetic fields of electric currents to be passed through electric current lead. Shape and size of joined members are changed due to moving movable members of shaping tool by action of forces caused at direct interaction of electromagnetic fields of electric currents. On portions of electric current lead turned to movable members of shaping tool electric current are passed in one direction while moving said portions together with movable members of tool. On portions of electric current lead remote from movable members electric currents are passed in opposite direction and motion of said portions is limited by means of restriction members.
EFFECT: enhanced efficiency of process, lowered energy consumption of used equipment.
FIELD: ventilation and air conditioning.
SUBSTANCE: connection by tight folded seam of two flexible metal pipes, sections of pipelines, segments or elbows of pipes used to transmit flows of gas is provided with double fold in form of flange at end of first pipe enclosed by second double fold made on end of second pipe at least with partial adjoining to shape and provision of enclosing solid metal sealing. Connection is formed by outward flanging universal bending or edging machine provided with forming rolls installed for rotation and feed rolls installed fro displacement in one plane. Said rolls are set into motion by motor and project from machine table. At first stage of operation double in form of flange is made on end of first pipe, and at second stage, step member is formed on end of other connected pipe. Width of step member exceeds size of double bend in form of flange. At third stage member is driven over double bend and projecting part of step member is pressed tightly to double bend with enclosing of bent and provision of sealing. Shifted lower roll of device is made in form of hollow shaft accommodating drive shaft carrying axially secured forming roll. Feed roll is made in form of hollow shaft which accommodates drive shaft carrying upper shifted forming roll. Feed roll and lower are mounted in slides to provide synchronous displacement. Rolls are also installed in slides for displacement in direction of axially secured forming roll and shifted lower roll.
EFFECT: provision of high tightness of connection.
4 cl, 11 dwg
FIELD: plastic metal working, possibly in crimping machines.
SUBSTANCE: crimping die set and coupling are used for holding worked part in crimping machine. Coupling is placed onto worked part with possibility of unclamping and it has fist clamping portion and second clamping portion mutually joined through hinge. Crimping die set may be inserted to crimping machine. Said die set has groove for worked part and recess for coupling on its working surface. Recess for coupling has configuration necessary for holding coupling in it. In order to crimp part in crimping machine, coupling is arranged around part in predetermined position and then it is tightened around part. Coupling and article are inserted into recess for coupling and groove for article respectively in crimping die set. Then die set with coupling and article is placed into crimping machine.
EFFECT: enhanced efficiency and reliability of crimping process.
13 cl, 6 dwg
FIELD: plastic working of metals, namely processes for forming butt welded seams on tubes at making tube studs of U-shaped tube bundles using effect of localized hot plastic deforming of welded seam and near-seam zones.
SUBSTANCE: method comprises steps of preliminarily working tube ends by expanding them from cylinder to cylinder; assembling tubes with use of mandrel and placing intermediate member of additive material between joined end surfaces of end portions of tubes sized by expansion and end surfaces of step ring. Welded seams are formed by argon-arc welding due to melting material of intermediate member at its both sides adjacent to tube ends. The intermediate member is heated up and it is subjected to hot radial squeezing while concentrating its initial deformation in surface layers according to position of ring steps, welded seams and near-seam zones on mandrel for providing size of their outer diameter equal to initial outer diameter of tubes.
EFFECT: improved quality of welded seams.
FIELD: welding jobs.
SUBSTANCE: invention relates to the methods of preparing the ends of pipes with inner polymer coating for welding, and can be used in repair of pipelines. The proposed method consists in the following. A tip with a rubber seal ring is fitted into the pipe with inner polymer coat, the aforesaid seal ring being place on pre-compressed smaller-diameter tip part, some 150 to 200 mm-long. Then using a mandrel, the aforesaid smaller-diameter part is expanded for the pipes ends sizes and shapes to match.
EFFECT: sealing of welded pipes, simpler procedure.
SUBSTANCE: invention relates to pressure materials processing with usage of energy of electric explosion of metallic conductor in liquid transfer medium and relates, particularly deformation and piercing of pipes of wide range of configuration and geometry in out-of-the-way places. Pipe is installed into opening of tube plate, it is located at the end of pipe pre-assembled structure, consisting of exploding element in the form of ring made of foil, located at the butt of strength cylinder made of dielectric, allowing through co-axial opening, in which it is located rod electrode, connected by electric contact to central part of ring made of foil. It is used the second electrode in the form of clenching metallic bushing, located at cylinder from the condition of providing of fixation on its side surface of peripheral part of ring, connected to rod electrode and bearing on centering insulating chain gears of core insert with installed on it director cone and figure of revolution, implemented of strong material. It is implemented location of figure of revolution and director cone of mentioned structure in area of pipe straining filling of pipe cavity by transfer medium, waterproofing of pipe by flexible plug of one butt and washer of the other, implementation of electric explosion of explosion element. Additionally in used pre-assembled structure of ring surface made of foil are implemented with profile by hyperbolic function, of thickness, increasing partly. Core insert is connected to rod electrode by means of filler, reinforced by metallic conductors, allowing at side surface symmetric longitudinal stringers, external diametre of which is equal to inner diametre of pipe.
EFFECT: there are increased method efficiency and coefficient of efficiency.
6 dwg, 1 ex
SUBSTANCE: invention relates to field of materials pressure processing with usage of electric explosion energy of metallic conductor in liquid transmission medium and relates particularly, deformation and insertion of pipes of wide range of configurations and geometry in out-of-the-way place. Pipe is installed into opening of tube plate, it is located in the end of pipe pre-assembled structure, consisting exploding element in the form of ring made of foil, located at butt of strength cylinder made of dielectric, allowing through co-axial opening, in which rod electrode, connected to electric contact with central part of ring of foil. It is used the second electrode in the form of cogging metallic bushing, located in the cylinder for the condition of providing of fixations at its side surface of peripheral part of ring, connected to rod electrode and supporting on centering insulating chain gears of core insert with installed on it guiding cone and body of revolution, implemented from strength material. There is implemented location solid of revolution and director cone of mentioned structure in area of pipe straining, filling of pipe cavity by transmitting medium, waterproofing of pipe by flexible cork of one butt and ring insertion of other, implementation of electric explosion of exploding element. Herewith in used preframed structure of ring surface from foil are implemented with profile by hyperbolic function, thickness, increasing from peripheral to central part, metallic bushing is implemented with inner clamp at the end, core insert allows length, equal to length of solid of revolution and director cone with centering gear and connected to rod electrode by means of rubber cord, reinforced by metallic strand, diametre of which is equal to inner diametre of ring.
EFFECT: there are increased effectiveness of method and coefficient of efficiency.
6 dwg, 1 ex
SUBSTANCE: claimed group of inventions refers to metal pressing and can be implemented for fitting compaction. The compaction tool of one of the inventions of the claimed group consists of a removable yoke with a head and of the first spring clamp to hold the first jaw of the head. The yoke has a lining and the second spring clamp to hold the second jaw on the lining. There is also a power unit with a base, wherein lining of the jaw and the yoke head are installed, and a movable piston, which contacts lining to transfer the second jaw in the direction of the first jaw during compacting operation.
EFFECT: increased reliability of tool.
17 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to pressuring by hydraulic device and may be used, in particular, for jointing fitting with tube by pressuring. Proposed device comprises piston and cylinder to act on pressuring jaws. Piston rod is jointed with acting appliances. Adjustable stop is arranged in direction of hydraulic piston travel to set piston extreme position in back stroke. Said stop is arranged outside said cylinder. By varying stop position, pressuring force is carried applied in pressuring. To set pressuring force, pressuring device is set so that pressuring is performed in continuous travel of piston.
EFFECT: expanded performances.
9 cl, 19 dwg