EP3590618B1 - Procédé de fabrication d'un tube de gainage, tube de gainage fabriqué selon ledit procédé ainsi que tube télescopique doté d'un tel tube de gainage - Google Patents

Procédé de fabrication d'un tube de gainage, tube de gainage fabriqué selon ledit procédé ainsi que tube télescopique doté d'un tel tube de gainage Download PDF

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Publication number
EP3590618B1
EP3590618B1 EP19183911.7A EP19183911A EP3590618B1 EP 3590618 B1 EP3590618 B1 EP 3590618B1 EP 19183911 A EP19183911 A EP 19183911A EP 3590618 B1 EP3590618 B1 EP 3590618B1
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EP
European Patent Office
Prior art keywords
seam
edge
tube
sheathing tube
radius
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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.)
Active
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EP19183911.7A
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German (de)
English (en)
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EP3590618A1 (fr
Inventor
Paul Heigl
Harald Schachinger
Edwin Pfisterer
Holger Kerstan
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.)
WELSER PROFILE AUSTRIA GmbH
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WELSER PROFILE AUSTRIA GmbH
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Publication of EP3590618A1 publication Critical patent/EP3590618A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
    • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes

Definitions

  • the invention relates to a method for producing a cladding tube from sheet metal.
  • the cladding tube has a protrusion pointing into the interior of the cladding tube, the protrusion acting as an anti-twist device for an insertion tube, the sheet metal having a first longitudinal edge and a second longitudinal edge, the first and second longitudinal edges being parallel to the longitudinal alignment of the sheet metal, wherein the first longitudinal edge is bent into a first envelope with a first envelope edge and the second longitudinal edge is bent into a second envelope with a second envelope edge, the sheet metal being bent in such a way that the first envelope and the second envelope lie within the cladding tube, the first The envelope edge and the second envelope edge are in direct contact, the first envelope edge and the second envelope edge being welded to one another so that the first envelope and the second envelope together form the projection, the longitudinal edges being bent over by 180 ° so that the envelopes are each at the later inside of the cladding tube attached en, wherein the longitudinal edges are bent in such a way that, after the sheet
  • Cladding tubes are used in combination with push-in tubes as telescopic tubes.
  • an insert tube has an outer diameter which corresponds to the inner diameter of the cladding tube, so that the insert tube can be inserted into the cladding tube and is displaceable relative to it.
  • the length of the telescopic tube formed in this way is adjustable and can be expanded by further cladding tubes, the previous cladding tube forming an insertion tube for the surrounding cladding tube.
  • a method of making a cooling tube is from, among others DE 2 210 006 A1 known. Process of this type used for the production of tubular telescopic rods.
  • the flow-forming method used to provide an anti-rotation device for the cladding tube requires an additional manufacturing step and, due to the local material weakening, leads to a lower stability of the cladding tube.
  • a method according to the preamble of independent claim 1 is from WO2018 / 056886 A1 known.
  • the object of the present invention is to provide a method for producing a cladding tube with an anti-rotation device from a sheet metal, which is easy to manufacture and has a high level of stability.
  • independent claim 1 the object is achieved by the features of independent claim 1. Accordingly, in a method according to the preamble of independent claim 1, there is an inventive solution to the object when the edges are welded together by means of inductive high-frequency welding, the first radius R1 being smaller than half of the sheet metal thickness D and the second radius R2 is greater than the first radius R1, with a groove being rolled into the sheet metal before or during the bending of the longitudinal edges in the area of the later folded edge, in particular in the area of the first radius R1, and / or the longitudinal edge is thinned to a smaller thickness up to the later folded edge, the smaller thickness of the thinned longitudinal edge being between 50% and 80% of the sheet metal thickness D.
  • an additional production step of flow molding or the use of an additional strip of material for this purpose can be dispensed with, and production can be simplified.
  • a thicker and more stable weld can be provided than through the direct welding of two longitudinal edges.
  • the sheet is preferably a pure metal sheet without a plastic coating or the like. In any case, the base material of the sheet metal is welded.
  • the sheet metal is more preferably a steel sheet.
  • the HF welding process can achieve a particularly high surface quality and weld stability.
  • the first radius is smaller than half the sheet thickness D, preferably less than 10% of the sheet thickness D, particularly preferably less than 2% of the sheet thickness, and very particularly preferably the first radius is so small that a sharp one at this point Edge exists.
  • the second radius is larger than the first radius and is preferably more than 30% of the sheet metal thickness D.
  • a groove is rolled in the sheet metal in the area of the later folded edge, in particular in the area of the first radius, the groove being made in the side of the sheet metal opposite the later first radius, and / or the longitudinal edge is made up to the later Edge of the cover thinned to a smaller thickness.
  • the smaller thickness of the thinned longitudinal edge is between 50% and 80% of the sheet metal thickness D.
  • the front side preferably runs straight between the first radius and the second radius, so that the front sides of the two folded edges can be at least partially brought into flat contact during welding.
  • this has the advantage that the longitudinal edges can be bent over by 180 ° with as little damage as possible.
  • it is thereby possible to upset the edges of the envelope with sharp edges before welding on the outer circumference and then to weld the edges of the envelope without breaking.
  • the step of high-frequency welding comprises the use of an impedance core.
  • a rod made of ferritic material is held in the area of the induction coil in the interior of the cladding tube, it being possible for the heat input to be concentrated further on the edges to be welded.
  • the production of the cladding tube includes an additional step of reworking a weld seam formed by the welding, so that the weld seam has neither an elevated seam nor an arched seam. This ensures a particularly high surface quality in the area of the weld seam.
  • the folded edges are preferably pressed against one another in such a way that a weld seam protrusion is created on the outer circumference of the cladding tube, which is planed off immediately after welding while it is still hot in order to achieve a high surface quality.
  • the elevation of the weld seam is preferably planed in the line at a distance of 500 mm to 700 mm from the welding point. A particularly economical production is achieved as a result.
  • This embodiment also contributes to rapid production of the cladding tube.
  • the width of a weld seam formed by the welding is at least a single thickness of the sheet metal, but is at most three times the thickness of the sheet metal.
  • the first and second folds are bent through 180 °, the first and second folds resting against the inside of the cladding tube.
  • the rigidity and the geometrical moment of inertia of the cladding tube can be increased further.
  • the effect of the eddy currents and thus of the heat input on the edges to be welded can be improved by the high-frequency welding step.
  • a first width of the first envelope perpendicular to the longitudinal extent of the cladding tube and a second width of the second envelope perpendicular to the longitudinal extent of the cladding tube are each at least twice the sheet metal thickness D of the sheet metal and preferably at most four times the sheet metal thickness D of the sheet metal.
  • a weld seam formed by the welding does not have any excess root relative to the projection. This ensures that an insertion tube can be inserted into the cladding tube without any problems.
  • the absence of a root elevation can in particular be achieved in that the inner second radius of the edge of the fold is greater than the first radius located on the outer circumference,
  • the present invention also provides a cladding tube which is produced from sheet metal by a method according to one of the preceding claims.
  • the present invention provides a telescopic tube with a cladding tube and a push-in tube, the push-in tube being insertable into the cladding tube and in relation to it Cladding tube is displaceable, wherein the insertion tube has at least one longitudinally extending groove along an outer side of the insertion tube, wherein the cladding tube has at least one longitudinally extending projection along an inner side of the cladding tube, wherein the groove and the projection cooperate in the manner of a rotation lock, the cladding tube through a method according to any one of the preceding claims is made from sheet metal.
  • the cladding tube 1 shown is formed from a sheet metal 10, in particular a sheet metal strip, the sheet metal 10 having a first envelope 3 bent by 180 ° with a first envelope edge 5 and a second envelope 4 bent by 180 ° with a second envelope edge 6.
  • the sheet metal 10 is brought into the shape of the cladding tube 1, the first folded edge 5 and the second folded edge 6 of the formed sheet 10 are against each other.
  • the area of the sheet metal 10 lying between the first folded edge 5 and the second folded edge 6 thus forms a cladding sheet 11 of the cladding tube 1.
  • the envelopes 3 and 4 are bent inward in such a way that the first longitudinal edge 7 and the second longitudinal edge 8 inside the cladding tube 1 lie.
  • the bending and the means for its implementation are already known and are not described in detail here.
  • the envelopes 3 and 4 are pressed firmly against the cladding sheet 11 of the cladding tube 1 by the 180 ° bending, so that the envelopes 3 and 4 form a double-walled area of the cladding tube 1 with the cladding sheet 11.
  • the first envelope 3 has a first width 13 perpendicular to the longitudinal extension of the cladding tube 1 and the second envelope 4 has a second width 14 perpendicular to the longitudinal extension of the cladding tube 1, the first width 13 and the second width 14 each being at least twice a thickness of the Sheet 10.
  • the cladding tube 1 is continuously passed through at least one induction coil through which alternating current flows, with a gap between the first folded edge 5 and the second folded edge 6 which, after passing through the induction coil, is caused by pressing the first folded edge 5 and the second folded edge 6 together is closed.
  • the cladding tube 1 is pressed together by profile rollers, so that the material of the folded edges 5 and 6, which is heated to a welding temperature, is welded together to form a weld seam 2.
  • the width 15 of the weld seam 2 is approximately twice the thickness of the sheet metal 10, so that the edges 5 and 6 are welded to one another over their entire thickness, but the envelopes 3 and 4 themselves are essentially not welded to the cladding sheet 11 are welded.
  • the means for performing high-frequency welding are already known and will not be described in more detail.
  • the first envelope 3 and the second envelope 4 together form a projection 9 which protrudes into the interior 12 of the cladding tube 1 and acts as an anti-twist device for an insertion tube 20.
  • the root 17 of the weld seam 2 does not protrude beyond the projection 9 formed by the envelopes 3 and 4, so that the weld seam 2 does not have any root elevation.
  • a subsequent step of mechanical post-processing of the weld seam 2 by a step of scraping or planing, the surface quality of the cladding tube is further improved, so that a seam elevation 16 is removed.
  • the cladding tube 1 forms a telescopic tube 20 together with an insertion tube 18.
  • the projection 9 of the cladding tube 1 engages in a groove 19 located on the outside of the insertion tube 18, so that the projection 9 acts as a rotation lock for the insertion tube 18.
  • the push-in tube 18 can be inserted into the cladding tube 1 and is displaceable with respect to it.
  • a groove 21 is rolled in the area of the later edge of the fold in order to facilitate further deformation and to reduce the risk of cracks.
  • the longitudinal edge is thinned to a smaller thickness until the later edge of the envelope, as is the case Figure 5 indicates.
  • the smaller thickness is preferably between 50% and 80% of the original sheet metal thickness D of the sheet metal 10.
  • the thinned edge area is then reshaped as shown in FIG Figure 6 is shown.
  • the resulting edge 5 has an end face facing the other edge 6, which extends radially in relation to the axis of the cladding tube and with a first radius R1 into the outer circumference of the Cladding tube, and merges with a second radius R2 into the inner circumference of the cladding tube, the first radius R1 being significantly smaller than the sheet metal thickness D of the sheet metal and the second radius R2.
  • the turning edge is upset during the deformation in such a way that the first radius R1 is particularly small and essentially forms a sharp edge.
  • the end face facing the other folded edge runs essentially straight between the first radius R1 and the second radius R2, so that the two folded edges can be at least partially brought into flat contact during welding, which makes the welding process much easier and a relatively low contact pressure during welding requires. This can reduce the risk of cracks.
  • FIG. 7 shows, when welding on the outer circumference, a certain weld seam elevation 16 arises, which is also desired, since this weld seam elevation 16, like Figure 8 shows, in a planing step immediately following the welding process, planing can be carried out while still hot in order to achieve a particularly high level of dimensional accuracy and surface quality.
  • a certain elevation 17 also arises on the inner circumference, but due to the relatively large second radius R2 it does not protrude beyond the projection 9 and therefore does not require any further treatment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Claims (11)

  1. Procédé de fabrication d'un tube de gainage (1) à partir d'une tôle (10), dans lequel le tube de gainage (1) présente une saillie (9) dirigée vers l'intérieur (12) du tube de gainage (1), dans lequel la saillie (9) agit à la manière d'un dispositif anti-rotation pour un tube d'insertion (18), dans lequel la tôle (10) présente un premier bord longitudinal (7) et un second bord longitudinal (8), dans lequel les premier (7) et second (8) bords longitudinaux sont parallèles à l'orientation longitudinale de la tôle (10), dans lequel le premier bord longitudinal (7) est plié afin d'obtenir un premier rabat (3) avec un premier bord de rabat (5) et le second bord longitudinal (8) est plié afin d'obtenir un second rabat (4) avec un second bord de rabat (6), dans lequel la tôle (10) est pliée de telle manière que le premier rabat (3) et le second rabat (4) se trouvent à l'intérieur du tube de gainage (1), dans lequel le premier bord de rabat (5) et le second bord de rabat (6) sont en contact direct, dans lequel le premier bord de rabat (5) et le second bord de rabat (6) sont soudés l'un à l'autre de sorte que le premier rabat (3) et le second rabat (4) forment ensemble la saillie (9), dans lequel les bords longitudinaux (7, 8) sont repliés à 180° de sorte que les rabats (3, 4) reposent respectivement sur la future face intérieure du tube de gainage (1), dans lequel les bords longitudinaux (7, 8) sont repliés de telle manière que le bord de rabat (5, 6), après formage de la tôle (10) afin d'obtenir le tube de gainage et avant le soudage des deux bords de rabat (5, 6), présente une face frontale, tournée vers l'autre bord de rabat (5, 6) respectif, qui s'étend de manière radiale par rapport à l'axe du tube de gainage (1) et rejoint la circonférence extérieure du tube de gainage en présentant un premier rayon R1 et rejoint la circonférence intérieure du tube de gainage en présentant un second rayon R2, dans lequel au moins le premier rayon R1 est inférieur à l'épaisseur de tôle D de la tôle (10), caractérisé en ce que les bords de rabat (5, 6) sont soudés l'un à l'autre au moyen d'un soudage par induction à haute fréquence, dans lequel le premier rayon R1 est inférieur à la moitié de l'épaisseur de tôle D et le second rayon R2 est supérieur au premier rayon R1, et en ce qu'une rainure (21) est imprimée dans la tôle (10) dans la région du futur bord de rabat (5, 6), en particulier dans la région du premier rayon R1, avant ou pendant le repliage des bords longitudinaux (7, 8), et/ou le bord longitudinal (7, 8) est aminci jusqu'au futur bord de rabat (5, 6) afin d'obtenir une épaisseur moindre, dans lequel l'épaisseur moindre du bord longitudinal aminci est comprise entre 50 % et 80 % de l'épaisseur de tôle D.
  2. Procédé selon la revendication 1, caractérisé en ce que le premier rayon R1 est inférieur à 10 % de l'épaisseur de tôle D.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le second rayon R2 est supérieur à 30 % de l'épaisseur de tôle D.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la face frontale est rectiligne entre le premier rayon R1 et le second rayon R2, de sorte que les faces frontales des deux bords de rabat (5, 6) peuvent être mises en contact au moins partiellement à plat lors du soudage.
  5. Procédé selon la revendication 1, caractérisé en ce que l'étape de soudage à haute fréquence comprend l'utilisation d'un impédeur.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les bords de rabat (5, 6) sont pressés l'un contre l'autre lors du soudage de telle manière qu'une surélévation de cordon de soudure (16), arasée immédiatement après le soudage lorsqu'elle est encore chaude, est produite sur la circonférence extérieure du tube de gainage (1).
  7. Procédé selon la revendication 6, caractérisé en ce que l'arasage de la surélévation de cordon de soudure (16) a lieu au sein de la ligne de production à une distance du point de soudure comprise entre 500 mm et 700 mm.
  8. Procédé selon la revendication 1, caractérisé en ce qu'une première largeur (13) du premier rabat (3) perpendiculairement à l'extension longitudinale du tube de gainage (1) et une seconde largeur (14) du second rabat (4) perpendiculairement à l'extension longitudinale du tube de gainage (1) sont respectivement au moins égales à deux fois l'épaisseur de tôle (D) de la tôle (10) et de manière préférée au plus égales à quatre fois l'épaisseur de tôle (D) de la tôle (10).
  9. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un cordon de soudure (2) formé par le soudage ne présente pas de surélévation de racine (17) par rapport à la saillie (9).
  10. Tube de gainage (1) fabriqué à partir d'une tôle (10), dans lequel le tube de gainage (1) présente une saillie (9), dans lequel la saillie (9) agit à la manière d'un dispositif anti-rotation pour un tube d'insertion (18), dans lequel la tôle (10) présente un premier bord longitudinal (7) et un second bord longitudinal (8), dans lequel le premier bord longitudinal (7) est plié afin d'obtenir un premier rabat (3) avec un premier bord de rabat (5) et le second bord longitudinal (8) est plié afin d'obtenir un second rabat (4) avec un second bord de rabat (6), dans lequel la tôle (10) est pliée de telle manière que le premier rabat (3) et le second rabat (4) se trouvent à l'intérieur du tube de gainage (1), dans lequel le premier bord de rabat (5) et le second bord de rabat (6) sont en contact direct, dans lequel le premier bord de rabat (5) et le second bord de rabat (6) sont soudés l'un à l'autre de sorte que le premier rabat (3) et le second rabat (4) forment ensemble la saillie (9), caractérisé en ce que le tube de gainage (1) est fabriqué grâce à un procédé selon l'une quelconque des revendications 1 à 9.
  11. Tube télescopique (20) comprenant un tube de gainage (1) et un tube d'insertion (18), dans lequel le tube d'insertion (18) peut être inséré dans le tube de gainage (1) et peut être déplacé par rapport au tube de gainage (1), dans lequel le tube d'insertion (18) présente au moins une rainure (19) s'étendant longitudinalement le long d'une face extérieure du tube d'insertion (18), dans lequel le tube de gainage (1) présente au moins une saillie (9) s'étendant longitudinalement le long d'une face intérieure du tube de gainage (1), dans lequel la rainure (19) et la saillie (9) coopèrent à la manière d'un dispositif anti-rotation, caractérisé en ce que le tube de gainage (1) est formé d'un tube de gainage selon la revendication 10.
EP19183911.7A 2018-07-02 2019-07-02 Procédé de fabrication d'un tube de gainage, tube de gainage fabriqué selon ledit procédé ainsi que tube télescopique doté d'un tel tube de gainage Active EP3590618B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018115975.7A DE102018115975A1 (de) 2018-07-02 2018-07-02 Verfahren zur Herstellung eines Hüllrohrs, Hüllrohr hergestellt nach dem Verfahren, sowie Teleskoprohr mit einem derartigen Hüllrohr

Publications (2)

Publication Number Publication Date
EP3590618A1 EP3590618A1 (fr) 2020-01-08
EP3590618B1 true EP3590618B1 (fr) 2021-12-15

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EP19183911.7A Active EP3590618B1 (fr) 2018-07-02 2019-07-02 Procédé de fabrication d'un tube de gainage, tube de gainage fabriqué selon ledit procédé ainsi que tube télescopique doté d'un tel tube de gainage

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EP (1) EP3590618B1 (fr)
DE (1) DE102018115975A1 (fr)
DK (1) DK3590618T3 (fr)

Citations (2)

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JPS4937624B1 (fr) * 1970-11-11 1974-10-11
GB2486788A (en) * 2010-12-22 2012-06-27 Denso Marston Ltd A heat exchanger, a tube for a heat exchanger, a method of making a tube for a heat exchanger and a method of making a heat exchanger

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FR1244868A (fr) * 1960-01-12 1960-09-19 Procédé de soudure de matériaux mixtes à base de métal et de matière plastique
US3131285A (en) * 1962-02-08 1964-04-28 American Mach & Foundry High frequency welding of metal elements of finite length
DE2210006A1 (de) 1971-03-17 1972-09-21 Rft Messelektronik Dresden Veb Rohrfbrmiger Teleskopstab
DE3238766A1 (de) * 1982-10-20 1984-04-26 Hoesch Werke Ag Verfahren und vorrichtung zur ueberwachung und/oder regelung des schweissstromes beim hochfrequenzwiderstandspressschweissen von laengsnahtrohren
SE462787B (sv) * 1989-01-03 1990-09-03 Ortic Ab Saett att tillverka fyrkantroer av belagda staalband
US5651819A (en) * 1993-06-24 1997-07-29 The Idod Trust Continuous tube forming and coating
DE4442434C1 (de) * 1994-11-29 1995-10-05 Welser Ohg Josef Verfahren zum Herstellen rollgeformter Hohlprofile aus Blech
FR2816859B1 (fr) * 2000-11-17 2003-01-31 Air Liquide Procede et installation de fabrication de tubes metalliques soudes en continu, tels des fils fourres de soudage
DE102005013139A1 (de) * 2005-03-22 2006-10-05 Mislavskyy, Oleksandr Das Staurohr des großen Durchmessers
SE540684C2 (en) * 2016-09-26 2018-10-09 Kinnarps Ab Manufacturing methods of elongated tubes, elongated tubes and telescopic columns of height-adjustable furniture

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Publication number Priority date Publication date Assignee Title
JPS4937624B1 (fr) * 1970-11-11 1974-10-11
GB2486788A (en) * 2010-12-22 2012-06-27 Denso Marston Ltd A heat exchanger, a tube for a heat exchanger, a method of making a tube for a heat exchanger and a method of making a heat exchanger

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DE102018115975A1 (de) 2020-01-02
DK3590618T3 (da) 2022-02-07
EP3590618A1 (fr) 2020-01-08

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