EP2903757A1 - Procédé de production rapide d'un tuyau multicouche - Google Patents

Procédé de production rapide d'un tuyau multicouche

Info

Publication number
EP2903757A1
EP2903757A1 EP13783468.5A EP13783468A EP2903757A1 EP 2903757 A1 EP2903757 A1 EP 2903757A1 EP 13783468 A EP13783468 A EP 13783468A EP 2903757 A1 EP2903757 A1 EP 2903757A1
Authority
EP
European Patent Office
Prior art keywords
material layer
layer
pipe
overlying
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13783468.5A
Other languages
German (de)
English (en)
Other versions
EP2903757B1 (fr
Inventor
Bernd Berg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
First Tube Intellectual Property Management Co of Luxembourg Sarl
Original Assignee
First Tube Intellectual Property Management Co of Luxembourg Sarl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by First Tube Intellectual Property Management Co of Luxembourg Sarl filed Critical First Tube Intellectual Property Management Co of Luxembourg Sarl
Publication of EP2903757A1 publication Critical patent/EP2903757A1/fr
Application granted granted Critical
Publication of EP2903757B1 publication Critical patent/EP2903757B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/154—Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B21D5/015—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments for making tubes

Definitions

  • the present invention relates to a method for the rapid production of a multilayer pipe.
  • Multilayer pipes are preferably used in case of high requirements against corrosion or abrasion.
  • Corrosion-resistant pressure vessels or pressure lines can be produced more cost-effectively by using multi-layer pipes than solid versions made of appropriate materials. This is achieved by the load sharing on a thin, corrosion resistant inner layer (e.g., stainless and acid resistant steel) and a high strength, pressure resistant outer layer (e.g., fine grain structural steel). As a result, overall steel consumption can be significantly reduced and much of the remaining steel consumption can be shifted to low-cost materials.
  • a thin, corrosion resistant inner layer e.g., stainless and acid resistant steel
  • a high strength, pressure resistant outer layer e.g., fine grain structural steel
  • Abrasion-resistant pipes are made possible by the design as a multilayer pipe (such as mechanical bond, see below) in certain grades in the first place, because materials (eg high-strength steels with high hardness) can be used as an inner layer, which alone or only very difficult can be processed into tubes.
  • tubular jacket In the construction of the tubular jacket is distinguished between full-surface metallurgical bond (this requires plated sheet metal as a starting semi-finished product), and purely mechanical bond (such as a friction bond) between inner and outer tube - preferably inner and outer plates and their welding to the sheet edges -.
  • the inner tube is pressed under elastic expansion of the outer tube and into the outer tube. After elimination of the expansion forces, the outer tube sets because of the higher elastic resilience frictionally around the inner tube.
  • the disadvantage of this method according to the prior art is due to the fact that the outer tube must have a higher yield strength than the inner, otherwise the lack of adhesion to the inner tube causing and therefore required elastic resilience of the outer tube.
  • This is particularly disadvantageous because high-strength materials - such as particularly high-strength steels - as they are preferably used for abrasion-resistant pipelines. conditions in the interior of the tube are particularly advantageous, have high or even very high yield strengths and thus are not suitable for this production process.
  • the use of rolled and / or blast-plated semifinished product is avoided by first creating a first joint between the material layers, such as a weld seam, and thereafter the respective material layer acting as an inner tube during tube forming in the bending roll by one after a certain deformation progress - Pressed further connection between the material layers frictionally in the respective functioning as an outer tube material layer and is held in this way frictionally in each outer tube, without having to expand the multilayer tube and thus the above Expansion methods mentioned.
  • this method has the production technical disadvantage that it is necessary here during the tube forming in the bending roll after a certain deformation progress to create a further connection between the factory tofflagen, which usually happens by welding. For this connection, it is therefore necessary to interrupt the tube forming in order to connect the two material layers together at this further point.
  • the still unfinished pipe must be removed from the bending roll and then created the connection, so in general, the weld can be applied.
  • It can also be welded in the bending roll, which blocks it during this time. Then, the tube blank (also called slot tube) can be re-introduced into the bending roll to continue the local manufacturing process.
  • Such a procedure is extremely time-consuming and therefore represents a significant production cost disadvantage.
  • WO 2006/066814 A1 also teaches a method in which individual layers of material to be combined with the multilayer pipe are stacked, wherein a material layer acting as a respective outer tube forms a base plate, which in each case along one of its two longitudinal edges or approximately parallel thereto one, preferably welded , Stop edge and the resting material layer comes to rest loosely between these abutment edges, and the thus formed multilayer material is formed by means of the bending roll to form a multilayer tube, wherein the respective acting as an inner tube material sheet clamped between the stop edges and in the final phase of the Pipe forming in the bending roll the respective functioning as an inner tube material layer is thereby pressed non-positively in the respective acting as an outer tube material layer.
  • WO 2006/066814 A1 as the respective inner layer, it is therefore also possible to use those materials, such as particularly high-strength steels, which are difficult or impossible to weld.
  • those materials such as particularly high-strength steels, which are difficult or impossible to weld.
  • the functioning as an inner tube material layer is pressed during the Rohrfomung in the bending roller frictionally in the respective acting as an outer tube material layer and so frictionally held in the respective outer tube and without that it requires a connection, such as a weld to be created. Therefore, a time- and cost-intensive interruption of the tube forming process in the bending roll is also not required here.
  • this manufacturing process in turn has the disadvantage that in this case the pipe inner layer is not completely closed inwardly, since a part of the pipe inner circumference is formed by the on the respective base plate, so the respective outer material layer, attached stop edges, which leads to here the beneficial effects of the tube inner layer, such as corrosion or abrasion resistance can not occur.
  • This disadvantage can not be solved simply by a build-up welding in this area, as a welded joint between the material of the stop edge and the inner layer in this process, which wants to avoid welding between outer and inner layer, just out of the question.
  • the interruption of the tube forming process in the Blechumformmaschine- thus avoided in the bending roll that at least two elements that later form the inner layer, initially, ie before the tube forming process, the edge later with the outer layer forming material layer, that is usually welded to this, be.
  • the tube forming process So for example, in the bending roll, then move the free ends of these elements due to the different bending radii (or circumferential lengths, which means the same) of inner and outer tube to each other and eventually encounter each other.
  • this object is achieved by a method for the rapid production of a multilayer pipe with the aid of a sheet metal forming machine in which the multilayer pipe has at least one first material layer and a material layer adjacent to the first material layer, with the adjacent material layer being bent at least slightly.
  • the aforementioned method steps by the order of their enumeration in the above text by no means require the same order in the execution of the method according to the invention.
  • the two material layer connections (preferably approximately) can be created simultaneously instead of successively. It is also possible to first make one of the connections between the material layers and then only make the bend, in order then to create the second connection between the material layers.
  • Such a bending on the end radius can be carried out approximately preferably with a bending press for metal sheets, as it is known from WO 2010/118759 A2.
  • a first connection between the overlying material layer and the adjacent material layer is created by the resting material layer with the adjacent material layer approximately along the first edge of the overlying material layer or approximately along a line parallel thereto, whereupon the thus formed multilayer material - and thus the adjacent material layer - in the area in which the material layers in about along the edge or along one Line are connected approximately parallel thereto by the first connection to each other, at least slightly bent (the concept of bending as plastic or elastic deformation, see above, there to the adjacent material layer), the second still free edge of the overlying material layer relative to the adjacent material layer in the direction a likewise free edge of the adjacent Wstofstofflage is positioned, and then the second connection between the overlying material layer and the adjacent material layer is created by the fact that the resting material layer with the adjacent
  • This embodiment of the production according to the invention described above is advantageous because it does not require any initial (initial) deformation - be it plastic or elastic - of the adjacent material layer. Rather, this bend is only in the course of the execution of the manufacturing method according to the invention, namely by the positioning, preferably, 'pulling over' the overlying material layer achieved simultaneously with this step of the method.
  • the circumferential circumference (width) of the tube cross-section - of the respective material layer Bi functioning as an inner tube between the two compounds of the material layers is selected such that with Bi as the (partial) circumference length (width before tube forming) in the tube cross-section of the respective material layer acting as inner tube between the two connections between the material layers, given in mm,
  • SI is given as the wall thickness of the respective material layer acting as an inner tube approximately in mm, and dj as the distance of the first connection along the first edge of the overlying
  • C-2 is given as the distance of the second joint along the second edge of the overlying material layer or along a line parallel thereto from the corresponding edge of the adjacent material layer at the time of creation of the second joint between the material layers approximately in mm.
  • ⁇ as yield strength (which usually corresponds approximately to the compression limit, especially in rolled metals -) of the overlying material layer (inner layer), ie the (later) inner tube - in N / mm 2 ,
  • modulus of elasticity modulus of elasticity of the applied material layer (inner layer), ie of the (later) inner tube - approximately in N / mm 2 .
  • the length of the neutral fiber - in a circular bent state - of the (later) outer tube - here called L n f a - is:
  • L NFA (DA - SA).
  • TE which corresponds to the average circumference length (considered in the tube cross-section) - here the (later) outer tube (and thus also the width of the respective material layer functioning as outer tube).
  • L n ßQg L n ßQg due to the different bending radii
  • L nfiOS (DA - 2 - SA - SI) - 7t, which also corresponds to the mean circumferential length - in this case, however, of the inner tube.
  • the inner layer can fit exactly in the outer position during the pipe forming, which means that the respective longitudinal edges of the exterior, as well as the inner layer with the completion of Rohrformungreaes- a geometrically ideal running tube forming process, ie the ideal formation of a circle (seen in the tube cross section) once assumed - at the same time abut.
  • the inner tube would be pressed against the outer layer only by its built-up during the forming process spring-back force. A compression of the inner tube, which would open due to the built-up in the material pressure and its curvature outwards against the respective outer material layer out in an additional pressing force of the inner tube against the outer tube, however, would not take place.
  • the respective material layer functioning as an inner tube is compressed in width during tube forming-namely, by the two connections between the material layers created by the method according to the invention-the material layer acting as the inner tube is thereby also seen in the respective outer (ie from the inner space of the tube outwardly adjacent) material layer pressed.
  • This pressing force can be up to the yield strength (respectively compression limit, which is usually - especially in rolled metal sheets, approximately equal to the yield strength -) increase.
  • the so-called technical yield strength also referred to as yield strength as the amount of stress of a plastic permanent elongation under a certain force
  • technical compression limit may be used instead.
  • Bi - Bj - B * Lnfa - 7i - (SA + SI).
  • width of the inner layer is thus chosen to be greater than the term on the right of the equation, a possible compression allowance (see above) is taken into account, which is able to compensate for the production inaccuracies, for example in position and / or guidance of the material layer strips the desired maximum pressing force of the inner tube against the outer tube is achieved in any case approximately.
  • the compression of the inner layer is provided by the two connections between the material layers, wherein the - seen in the (later) pipe cross section - respective two corresponding edges of the adjacent material layers at the time of creation of the first and the second connection between the material layers in each case - preferably approximately - lie flush against each other and the respective connection also - preferably approximately - along the respective edge - preferably by a weld along the edge - takes place.
  • the method for producing a multi-layer tube according to the present invention is characterized in that the first connection between the material layers is created by this - preferably approximately - along one of the longitudinal or transverse edges of the overlying material layer or - preferably along - along a line parallel thereto but also along or parallel to the future pipe seam.
  • the laid-up (n) material layer (s) may or may therefore lie with its longitudinal edge parallel to the longitudinal edge of the adjacent (about underlying) material layer, but need not or must not. So it is also possible that they come to lie with their longitudinal edge transverse thereto or come.
  • the connection with the adjacent (approximately below) material layer is preferably carried out along or parallel to the future pipe longitudinal seam.
  • connection along an edge or along a (preferably imaginary) line means any type of connection along the edge or line, whether or not it is Connection along the entire edge or line or only in sections along the edge or line or even in single points (such as spot welds), for instance at two points - preferably at the end points of the edge or line - or even at a single point at the point Edge or on the line.
  • the functioning as an inner tube material layer in the finished multilayer pipe in cross section form a circle, which can be achieved in that the elements of the overlying material layer, which later form the Rohririnenlage cover only a portion of the surface of the material layer, which later forms the outer layer.
  • the material layer functioning as an inner tube and forming a partial circle in cross-section in the finished multilayer tube forms a groove at the foot of the multilayer tube.
  • the multilayer tube can be closed by welding the outer tube along the pipe seam. Also, this is preferably carried out a surfacing of the inner tube along the pipe seam. Preferably, the multilayer tubular body is thus completed.
  • the material layers can be connected to the front sides of the tube, such as there to prevent the ingress of moisture between the metallurgically yes not fully connected material layers.
  • a preferred application of the method according to the present invention is the production of double-layer tubes, however, the invention is not limited thereto, also three-, four- and more multi-layer tubes of the invention are hereby basically produced.
  • sheets preferably metal sheets and particularly preferably steel sheets, are used as the material layer or as elements of the material layer.
  • At least one of the joints of the material layers is preferably used as a weld, which is particularly suitable for the aforementioned metal sheets, preferably steel sheets.
  • Blechumformmaschine is about a bending roll, for example, a three-roll bending machine, but also a press / die assembly, as in the context of known from the prior art UOE (U-shapes, O-forms, expanding) - Tube forming method (see the UOE method, for example: Hiersig, Heinz M., Encyclopedia Mechanical Engineering, Heidelberg 1997, p 704 f., For keyword, ingsnaht arrohrherstellun c ) or also the so-called JCO-tube deformation method is used.
  • UOE U-shapes, O-forms, expanding
  • the pipe is formed by first placing the sheet in a press by means of a sword in the shape of a horizontal J 'and then in that of a horizontal C'. After that, it is then - as in the case of the UOE method - bent into the, ⁇ 'form.
  • 1 to 6 is a perspective view of individual steps of the method according to the invention for the rapid production of a multilayer pipe by means of a sheet metal forming machine, these individual steps not necessarily representing all the same forming process of the same material layers, but rather characteristic steps or stations in a schematic way of the molding process and the individual material layers from step to step or from station to station can be quite different than they can be seen in the preceding or following steps or stations, so as different variants of the method according to the invention with reference to a series of representations in the 1 to 6 show that
  • inner layer also called inner tube, inner tube, inner plate, etc.
  • outer layer also called outer tube, outer tube, base plate, etc.
  • FIG. 8 shows a perspective cross-section through a multilayer pipe according to FIG. 7 with inner layer and outer layer in a detailed view in the region of the (welded) joints in the vicinity of the longitudinal seam weld
  • FIG. 9 shows a situation in the method according to the invention when the sheet metal forming is carried out by means of a UO (E) press / die arrangement
  • Fig. 11 then the forming step, which forms a, ⁇ ', ie a slot pipe, and
  • Fig. 12 is an exemplary stress-strain diagram for explaining how the desired maximum pressing force is achieved by compression of the inner layer in the scope.
  • FIG. 1 shows a first and second step of an embodiment of the method according to the invention for the rapid production of a multilayer pipe with the aid of a sheet metal forming machine in a perspective view (the sheet metal forming machine can not be seen here).
  • a first connection 3a - preferably a welded joint - between the resting material layer 1 and the adjacent material layer 2 created by the fact that the overlying material layer 1 with the adjacent material layer 2 - preferably approximately - endang a first edge 4a of the resting Material layer 1 connected - preferably welded - is.
  • the (first) edge 6a of the adjacent material layer 2 corresponding to the first edge 4a of the resting material layer 1 lies here from the first connection 3a of the two material layers 1, 2 to be seen by the distance dj with respect to the resting material layer 1 and its first Edge 4a - offset to the outside.
  • the first connection 3a of the material layers 1, 2 thus also lies from the first edge 4a of the overlying material layer 1 corresponding (first) edge 6a of the adjacent material layer 2 by the distance d j - with regard to the adjacent (here below) material layer. 2 and its first edge 6a - offset inwards.
  • Fig. 2 shows a third step of the method according to Figs. 1 to 6, where the multilayer material formed by the preceding steps in the area in which the material layers 1, 2 endang the edge 4a by the first compound 3a verbun together - are bent, which can be done about by means of a bending roll, for example a three-roll bending machine or by means of a press, such as a press brake, but also by means of any other suitable machine or any other suitable tool (possibly also manually).
  • the first edge 4 a of the overlying material layer 1 and the corresponding edge 6 a of the adjacent material layer 1 lie flush against one another.
  • the distance mentioned in FIG. 1 between the first connection 3a of the material layers 1 and 2 and the edge 6a of the adjacent material layer 2, which here runs along the two mutually flush edges 4a and 6a, is in the material layers 1, 2 to be seen here rithin, so zero.
  • Fig. 3 shows a fourth step of the method according to the present invention corresponding to Figs. 1 to 6, in which case the still free edge 4b of the overlying material layer 1 relative to the adjacent material layer 2 in the direction 10 whose also still free (second) edge 6b is moved.
  • This is preferably done so that this edge 4b is detected by means of a gripping device (not seen here), e.g. by a pair of pliers which grips the resting material layer 1 by means of one or more clamping jaws (not seen here) and then - in the direction of 10 of the likewise free (second) edge 6b of the adjacent material layer 2 - for instance by means of the gripping device.
  • Edge 6b of the adjacent material layer 2 offset by the distance C-2 - with respect to the adjacent (here below) material layer 2 and the second edge 6b - inward.
  • FIG. 4 shows, for the first, a fifth step of the method according to FIGS. 1 to 6, in which two material layers 1, 2 can be seen, after the previously free edge 4b of the overlying material layer 1 relative to the adjacent material layer 2 in direction 10 thereof also previously free edge 6b moved - preferably pulled - was and in the, from this movement finally resulting position of the material layers 1, 2 to each other a second compound 3b - preferably a welded joint, such as a weld - between the overlying material layer 1 and the adjacent material layer 2 was created.
  • a first connection 3a had previously been created along the first edge 4a of the overlying material layer 1.
  • the respectively corresponding edges 4a, 6a on the one hand and 4b and 6b on the other hand lie flush (approximately) flush with each other on the material layers 1 and 2, namely on the line along which the two material layer connections also follow 3a on the one hand and 3b on the other.
  • the embodiment as can be seen here, thereby moving the previously free edge 4b of the overlying material layer 1 in the direction 10 of the previously still free edge 6b of - here below - adjacent material layer 2 and the subsequent second connection 3b the two material layers 1, 2 along the previously free edge 4b of the overlying material layer 1 already caused a curvature of the entire future tubular body.
  • FIG. 4 also shows the first step of another embodiment of the method according to the present invention, namely First, the adjacent material layer 2 has been bent, such as by means of bending press for metal sheets, as known from WO 2010/118759 A2 and which makes it possible to reach in the region of the edges 6a and 6b of the adjacent material layer 2 already the final radius of the multilayer pipe to be produced ,
  • the bending of the adjacent material layer 2 can also be achieved approximately in that this layer 2 is pressed into a correspondingly shaped die or even placed where it undergoes a bend due to the pressure or its own weight.
  • the material layers 1, 2 to be combined to form the multilayer pipe were then stacked on one another, the first material layer 1 being positioned as a resting material layer 1 on the adjacent material layer 2.
  • a first connection 3a between the overlying material layer 1 and the adjacent material layer 2 was created by connecting the overlying material layer 1 to the adjacent material layer 2 approximately along a first edge 4a of the overlying material layer 1.
  • a second connection 3b between the overlying material layer 1 and the adjacent material layer 2 has also been created and approximately along a second edge 4b of the overlying material layer 1, these compounds both sequentially, but also - preferably approximately - can be created simultaneously.
  • a (approximately) simultaneous creation of both compounds is approximately possible if the resting material layer 1 immediately - for example by means of a suitable conveyor - in the correct position on the adjacent - then already bent - material layer 2 is positioned.
  • the multilayer material 1, 2 formed in this way can then be formed into a multilayer pipe 5 by means of the sheet metal forming machine, during which shaping the respective resting material layer 1, which then acts as an inner pipe, between the two material layer connections 3a, is produced above a certain degree of deformation , 3b in - seen in the cross section of the (later) (multi-layer) pipe - (partial) circumferential direction and thus compressed in the adjacent and then acting as an outer tube material layer 2 is pressed.
  • FIGS. 5 and 6 show the final step of a preferred embodiment of the method according to the present invention corresponding to FIGS. 1 to 6, where the multilayer material formed by previous steps is removed by means of the sheet metal forming machine (not shown here) Pipe 5 (more precisely to the slotted pipe), namely the multilayer pipe (more precisely multi-layer slot pipe) is formed, wherein during this molding the material gene 1, 2 - due to the previously made connections 3a, 3b with each other - (preferably from a certain deformation progress) between the two compounds 3a and 3b in - seen in cross-section of the (later) (multilayer) tube - (part) circumferential direction be compressed, whereby the respective functioning as an inner tube material layer 1 - preferably non-positively - is pressed into each functioning as an outer tube material layer 2.
  • Fig. 7 shows a perspective cross-section through a finished multilayer pipe 5 with inner layer (as well as inner material layer, material inner layer, inner tube, inner tube, inner plate or the like called) 1 and outer layer (as well as outer material layer, outer material layer, outer tube, outer tube, base plate or the like called) 2, wherein the multilayer pipe 5 was preferably closed by a weld 7 of the outer tube 2 along a Rorhrnaht 8.
  • a contract weld 9 of the inner tube 1 can be made to close the tube, which can be seen here.
  • build-up welding 9 is not mandatory.
  • the first (welding) connection 3a and the second (welding) connection 3b between the resting material layer 1 and the adjacent material layer 2 are also shown.
  • FIG. 8 shows a perspective cross-section through a multilayer pipe according to FIG. 7 with inner layer 1 and outer layer 2 in a detailed view in the area of the (welded) connections (such as welds) 3a, 3b and the welds (such as welds or build-up welds) 7 and 9.
  • welded connections such as welds
  • welds such as welds or build-up welds
  • Fig. 9 shows a situation of the method according to the invention when the sheet metal forming is carried out approximately by means of a UO (E) press / die arrangement.
  • the later outer material layer 2 Hegt down here and the later inner layer 1 above.
  • the upper layer 1 was with her - after welding the first compound 3a with the adjacent layer 2 - still free edge 4b in the direction 10 of the still free edge 6b of the adjacent (here below lying) material layer 2 pulled to the distance between both edges 4b and 6b was zero (the edges 4b and 6b thus abut one another directly) and in this position the edges 4b and 6b are welded to one another at the edges along the edge 4b adjacent to the adjacent material layer 2 below, whereby a second connection 3b between the material layers 1, 2 has emerged.
  • material layer 2 has here at the same time a bending (be it a plastic bending, be it an elastic bending) at the other end of the material layers 1, 2, namely caused in the region of the first compound 3a, which again shows in that bending does not necessarily have to be carried out as a first method step.
  • Fig. 10 shows the forming step of a, U 'shaped by means of a press (not shown here), which drives a correspondingly shaped punch 11 down where the material layers 1 and 2 together in a die (not here also not to be driven).
  • a press not shown here
  • the functioning as an inner tube material layer 1 - preferably from a certain deformation progress - (with a corresponding width of the inner layer 1) between the two compounds 3a, 3b of the material layers 1, 2 compressed and (non-positively) pressed into the outer layer acting as material layer 2.
  • Fig. 11 shows the forming step, which forms a, ⁇ ', ie a slot tube by means of a press (not shown here), the two formed as a half-round punch 12, 13 drives against the tubular body to be formed, where the material layers 1 and 2 hereby again together to form a - seen in cross section - round.
  • the inner material layer 1 is compressed with a corresponding width between the two material layer connections 3a and 3b and pressed there into the outer layer 2.
  • the inner layer 1 does not jump from the outer layer 2, but hangs up the outer layer 2 at.
  • the method according to the invention can be carried out in a similar manner by means of a press / die arrangement designed for the so-called JCO 'method.
  • JCO press / die arrangement designed for the so-called JCO 'method.
  • the overlying material layer 1 is connected to the later outer layer forming material layer 2 at least by two compounds 3a, 3b and then formed a slot tube by the JCO method.
  • the desired effect according to the invention occurs, in which (preferably from a certain deformation progress) a compression of the inner layer 1 - with a corresponding width - between enters the two material layer connections 3a and 3b and so the inner layer 1 is pressed into the outer layer 2.
  • connections 3a and 3b of the two material layers 1 and 2 can be produced by means of a weld, for example a weld.
  • Fig. 12 shows an exemplary stress-strain diagram for explaining how the target maximum pressing force is achieved by compression of the inner layer in the scope.
  • the aim of the present invention is to compress the inner layer material of the multilayer pipe so far that you get into the area S of the here seen stress-strain diagram, so as to achieve the maximum possible compression of the inner to the outer layer by the compression, which to ensure a firm fit of the inner tube in the outer tube.
  • the respectively acting as an inner tube material layer is characterized in the respective outer (ie seen from the pipe interior to the outside adjacent) pressed material layer.
  • This pressing force can be up to the yield strength ⁇ (respectively compression limit, which is usually - especially in rolled metal sheets, approximately equal to the yield strength -) increase.
  • yield strength also referred to as yield strength as the amount of stress of a plastic permanent elongation under a certain force
  • technical compression limit can be cited instead.
  • the region H - ie, in the area of plastic strain (eg in the field of so-called Luders curve ⁇ ) - in this case, the area south - by contrast, can this power not significantly (at least not proportionally) increase.
  • the maximum pressing force of the inner against the outer layer is to be achieved as reliably as possible, in any case approximately, it must be ensured that the compression limit ⁇ 1 (yield strength) is actually reached.
  • the compression of the material layers in the area between the two material layer connections which are spaced apart from each other by d- j or d2.
  • the edges of the adjacent material layer preferably lie inwards (ie towards the center of the adjacent material layer), so for B j the width of the inner layer between the two material layer connections is:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention concerne un procédé de production rapide d'un tuyau multicouche (5), au moyen d'une machine de façonnage de tôle, le tuyau multicouche (5) présentant au moins une première couche de matériau (1) et une couche de matériau (2), adjacente à la première couche de matériau (1), ledit procédé consistant à incurver d'abord au moins légèrement la couche de matériau adjacente (2), à superposer les couches de matériau (1,2) à combiner pour la formation d'un tuyau multicouche (5), la première couche de matériau (1) étant disposée comme couche de matériau recouvrante (1) sur la couche de matériau adjacente (2), à créer une première liaison (3a) entre la couche de matériau recouvrante (1) et la couche de matériau adjacente (2) de façon que la couche de matériau recouvrante (1) soit liée à la couche de matériau adjacente (2) sensiblement le long d'un premier bord (4a) de la couche de matériau recouvrante (1), ou sensiblement le long d'une ligne parallèle à ce bord, à créer une seconde liaison (3b) entre la couche de matériau recouvrante (1) et la couche de matériau adjacente (2) par liaison de la couche de matériau recouvrante (1) avec la couche de matériau adjacente (2) sensiblement le long d'un second bord (4b) de la couche de matériau recouvrante (1), ou sensiblement le long d'une ligne parallèle à ce bord, et à mettre en forme le matériau multicouche (1, 2) ainsi obtenu à l'aide de la machine de façonnage de tôle, pour former un tuyau multicouche (5). Au cours de cette mise en forme, à partir d'un certain degré de déformation, la couche de matériau (1) recouvrante respective destinée à servir ultérieurement de tuyau intérieur est refoulée entre les deux liaisons (3a, 3b) de couches de matériau, dans la direction de la périphérie (partielle) et, de ce fait, pressée dans la couche de matériau adjacente (2) destinée à servir ultérieurement de tuyau extérieur.
EP13783468.5A 2012-10-02 2013-08-22 Procédé de production rapide d'un tuyau multicouche Not-in-force EP2903757B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012019315.7A DE102012019315A1 (de) 2012-10-02 2012-10-02 Verfahren zur schnellen Herstellung eines Mehrlagenrohres
PCT/DE2013/000473 WO2014053108A1 (fr) 2012-10-02 2013-08-22 Procédé de production rapide d'un tuyau multicouche

Publications (2)

Publication Number Publication Date
EP2903757A1 true EP2903757A1 (fr) 2015-08-12
EP2903757B1 EP2903757B1 (fr) 2016-11-16

Family

ID=49509893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13783468.5A Not-in-force EP2903757B1 (fr) 2012-10-02 2013-08-22 Procédé de production rapide d'un tuyau multicouche

Country Status (7)

Country Link
EP (1) EP2903757B1 (fr)
KR (1) KR20150064733A (fr)
CN (1) CN104853859B (fr)
DE (2) DE102012019315A1 (fr)
EA (1) EA201590383A1 (fr)
SG (1) SG11201502000VA (fr)
WO (1) WO2014053108A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015000202A1 (de) 2014-07-28 2016-01-28 Sosta Gmbh & Co. Kg Verfahren zur Herstellung eines Mehrlagenrohres
KR101657817B1 (ko) * 2014-12-23 2016-09-20 주식회사 포스코 클래드 강관용 판재 제조방법과 그 제조장치 및 클래드 강관
US9822908B2 (en) * 2015-12-10 2017-11-21 Ford Global Technologies, Llc Hydroform tube and method of forming
DE102024111997A1 (de) * 2024-04-29 2025-10-30 Voestalpine Grobblech Gmbh Verfahren zum Erzeugen eines mehrlagigen Stahlrohres, mehrlagiges Stahlrohr und Stahlband zu dessen Herstellung

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE582387C (de) * 1933-08-14 Kurt Ruppin Verfahren zur Herstellung von doppelwandigen Rohren oder aehnlichen Hohlkoerpern
US3327383A (en) * 1963-01-03 1967-06-27 Walter C Reed Method of making clad pipe
JPS60111791A (ja) * 1983-11-21 1985-06-18 Kawasaki Steel Corp 多重ｕｏｅ管の製法
ATE395150T1 (de) * 2004-12-21 2008-05-15 Bergrohr Gmbh Siegen Verfahren zur herstellung eines mehrlagenrohres
WO2010118759A2 (fr) 2009-04-16 2010-10-21 Gmbh Siegen Bergrohr Presse à cintrer pour feuilles de tôle
EP2285508B1 (fr) 2009-06-19 2011-08-17 Bergrohr GmbH Siegen Procédé optimisé de production pour la fabrication d'un tube multicouche
WO2011110195A1 (fr) * 2010-03-11 2011-09-15 Bergrohr Gmbh Siegen Ligne de formage et procédé de fabrication d'un tube multicouche

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
CN104853859B (zh) 2017-06-09
EA201590383A1 (ru) 2015-09-30
KR20150064733A (ko) 2015-06-11
DE102012019315A1 (de) 2014-04-03
DE112013004862A5 (de) 2015-08-27
SG11201502000VA (en) 2015-05-28
EP2903757B1 (fr) 2016-11-16
WO2014053108A1 (fr) 2014-04-10
CN104853859A (zh) 2015-08-19

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