EP0569307B1 - Dispositif permettant le formage d'ailettes hélicoidales sur la paroi extérieure de tubes - Google Patents

Dispositif permettant le formage d'ailettes hélicoidales sur la paroi extérieure de tubes Download PDF

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Publication number
EP0569307B1
EP0569307B1 EP93420180A EP93420180A EP0569307B1 EP 0569307 B1 EP0569307 B1 EP 0569307B1 EP 93420180 A EP93420180 A EP 93420180A EP 93420180 A EP93420180 A EP 93420180A EP 0569307 B1 EP0569307 B1 EP 0569307B1
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EP
European Patent Office
Prior art keywords
tube
axis
forming roll
translation
forming
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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.)
Expired - Lifetime
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EP93420180A
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German (de)
English (en)
French (fr)
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EP0569307A1 (fr
Inventor
Michel Cretin
Charles Marcon
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Escofier Technologie Sa SA
Escofier Technologie SAS
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Escofier Technologie Sa SA
Escofier Technologie SAS
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    • 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
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • 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
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides

Definitions

  • the device which is the subject of the invention relates to the production of finned tubes for heat exchangers between two fluids or mixtures of liquid or gaseous fluids or also partly liquid and partly gaseous, one of which circulates inside. of the tube and the other outside.
  • Such fins can be obtained by rolling on the outer surface of a tube, for example two knobs, arranged on either side of this tube along a helical path.
  • Each of these knobs comprises several revolution disks mounted on the same axis. The edges of these discs gradually penetrate into the wall of the tube by pushing the metal from it in the intervals which separate them, thus forming at least one helical fin.
  • the knobs are given the angle of advance necessary to obtain the relative displacement of the tube with respect to the knobs, which results in the formation of helical fins.
  • tubes for heat exchangers have shown the advantages of finned tubes in the use of metals or alloys having a high resistance to corrosion by different liquid or gaseous fluids brought to relatively high temperature.
  • Metals or alloys such as stainless or refractory steels, titanium and its alloys, stainless or refractory alloys and in particular those with a high nickel content, have thermal conductivities which can be low and also have a relatively poor ability to cold forming.
  • This device is designed for forming by rolling at least one helical wing on the outer wall of a tube.
  • it is a seamless or welded metal tube made of a metal or alloy adapted to the temperature conditions and to the nature of the fluid or fluids with which it is contacted.
  • They may, for example, be carbon steels, ferritic or austenic stainless steels, refractory steels, titanium or titanium-based alloys or any other metal or alloy whose physicochemical properties are suitable for the intended conditions of use.
  • the device comprises two movable carriages, arranged one opposite the other, on either side symmetrically of the axis of travel of a finned tube, each of these carriages comprising two wheels mounted each on a wheel holder head.
  • a means of translation makes it possible to bring the two carriages symmetrically towards one another to a working position such that the four knobs come to bear against the tube to be formed, disposed along the axis of travel, with a force determined tightening.
  • the rollers are distributed around the tube, inclined at the same angle of advance and positioned relative to the axis of travel, relative to each other, so as to each participate in the fin of the tube.
  • the means of translation also makes it possible to separate the two carriages from one another to release the finished tube, put the next tube in place and also, whenever necessary, carry out checks, adjustments or changes of tools.
  • the means of translation of the carriages allowing in particular the approximation and the tightening of the rollers is preferably constituted by at least one jack whose body is connected to one of the carriages and the piston to the other.
  • a synchronization means ensures a simultaneous translation of the two carriages in one direction as in the other.
  • This synchronization means comprises a tilting beam or lifting beam mounted on a fixed pivot whose axis intersects the scroll axis; rigid rods or connecting rods are each connected symmetrically in an articulated manner, to the carriage by one end and to one of the two ends of the tilting beam by the other.
  • a means of precise adjustment of the stroke of the clamping cylinder or cylinders is preferably used to ensure reproducible tightening, in the working position, of the knobs against the outer wall of the tube to be formed.
  • This adjustment means is preferably constituted by a means for closing the supply line of the cylinder with pressurized fluid.
  • the closure means connected directly or indirectly to the piston rod of the jack, comprises an adjustment means such as a micrometric screw making it possible to precisely adjust the length of stroke of the piston for which the closure closes l power to the cylinder and therefore causes the piston to stop.
  • a means of opening a discharge pipe intervenes in the event that an incomplete closure of the supply to the jack does not immediately and completely stop the piston.
  • Each wheel holder head is mounted in abutment on a surface of a tool holder secured to the carriage and can rotate a few degrees around an orientation axis which intersects in the working position the forming area of the corresponding wheel on the tube.
  • the four orientation axes are distributed at approximately 90 ° from each other. We thus reduce while making the effort symmetrical performed by each wheel on the tube to form the fins relative to existing conventional devices which have only three wheels distributed at 120 ° from one another around the tube.
  • Each wheel is mounted on a wheel holder shaft, guided in rotation on bearings integral with the wheel holder head.
  • a motor shaft, arranged parallel to the wheel-holder shaft, is also mounted on bearings, integral with the wheel-holder head and is connected to the wheel-holder shaft by a transmission means, for example by gears.
  • the four drive shafts are connected by articulated transmission means arranged, preferably around the axis of travel of the tube, to a common rotational drive means which ensures the rotation at strictly equal speed of the four knobs.
  • the articulated transmission means consist of four shafts provided with articulated joints at their two ends, for example cardan joints and comprising a telescopic part, shafts connected, at one end, to a motor shaft of a carrying head -wheel and, at the other end to a common rotational drive means.
  • this common rotary drive means comprises a ring gear whose axis corresponds to the axis of travel of the tube which passes through it.
  • a pinion actuated directly or indirectly by a motor means, rotates this toothed crown and four identical pinions distributed around the axis of the crown, at 90 ° from each other, each driving directly or indirectly l 'corresponding drive shaft.
  • a passage through the ring gear allows it to pass through the tube during forming.
  • the wheel shafts are arranged so that the orientation axis which intersects the zone of formation of the wall of the tube by the corresponding wheel also intersects the axis of travel in the clamping position, or passes in the immediate vicinity of that -this. It is thus possible, by angularly moving the wheel-holder head around the orientation axis, to give the corresponding wheel a determined angular inclination in order to give at least one helical fin a determined pitch.
  • the range of the wheel head on the bearing surface of the tool holder end of the corresponding carriage is a plane perpendicular to the axis of orientation.
  • the angular setting of the orientable part of the wheel holder around the orientation axis is carried out by means of shims which are introduced between a wall integral with the tool holder end of the carriage and the wall in look of a part secured to the wheel holder head.
  • Locking means allow, after adjusting the feed angle and after possible adjustment of the distance between the axis of the wheel-holder shaft and the scroll axis, to block the door head in rotation. -wheel relative to the tool holder end of the carriage which avoids any risk of angular displacement.
  • the locking means used may include, for example, threaded rods which pass through the bearing surface of the wheel-holder head and are connected to the tool-holder end of the carriage.
  • each of the wheel-holder heads comprises a removable part in which is housed at least one bearing on which the wheel-holder shaft is mounted at one of its ends, this removable part being fixed in such a way that, after detachment from the wheel holder head, it is possible to easily disassemble the corresponding wheel holder shaft.
  • one of the bearings of the motor shaft which drives the wheel-holder shaft is also housed in this removable part, in order to allow, if necessary, the disassembly of this shaft as well as of the holder shaft. wheel and the transmission means which connects them to each other.
  • each wheel is constituted by a stack of disks of revolution.
  • the diameter of several of these discs increases in the direction of progression of the tube in order to allow progressive formation of the fins.
  • This forming is accompanied by an elongation of the tube with reduction of its diameter and of its thickness measured below the fins.
  • a mandrel held in place by a retaining rod, of length greater than that of the tube and whose end outside the tube, at the rear of this one, is hung on a fixed point.
  • the mandrel is mounted free to rotate about the axis of travel of the tube, thanks to a bearing provided between the mandrel and the retaining rod or between the retaining rod and the fixed point of attachment.
  • This mandrel advantageously has a substantially frustoconical shape with a generator inclined a few degrees relative to its axis, in order to support the inner wall of the tube in the section reduction zone thereof under the action of the knobs. It is advantageously adjustable in axial position in order to maintain the collapse of the tube under the action of the rollers.
  • Chutes can be used to facilitate guiding and moving the tube along the axis of travel. It is necessary to coat these chutes with a layer of plastic which facilitates the rotational movement of the tube, under the action of the rollers without risk of catching and deterioration of the fins.
  • Pinch-rolls drive rollers placed upstream and downstream of the forming device are advantageously used for the positioning of the smooth tube on the chuck rod and for the extraction of the tube from the chuck rod at the end of the operation.
  • Proximity detectors such as eddy current detectors, located downstream from the start of the finning operation, as well as for the interruption thereof at predetermined intervals, are advantageously used.
  • the forming zone at locations precisely identified along the chute with respect to the fin zone.
  • These detectors which are at least two in number, are connected to electronic means which allow the start-up of the finning operation and also its interruption, if necessary, in intermediate zones provided for non-finned parts which will become, for example, the curved parts of the tube. It is thus possible to produce on the tube several finned zones separated by smooth zones.
  • the start-up of the fin is preferably carried out by electronic means which make it possible to set the wheels in rotation at reduced speed then a gradual approach of the carriages at slow speed with the application of the wheels with progressive tightening also.
  • the rotational speed of the knurls is then increased to their operating speed.
  • austenitic stainless steel tubes such as 304 or 316 steel of approximately 15 to 25 mm outside diameter and 1.5 to 2.5 mm thick
  • before forming the clamping force of each wheel is about 30 + 10 kN.
  • the diameter of the rollers is of the order of 25 to 50 mm and the speed of forming in regime can reach 4 to 10 m / min.
  • Figure 1 is a schematic front elevation view, in a plane perpendicular to the axis of travel of the tube, of the assembly constituted by the four knurling heads and the front end of the two carriages of the device according to the invention .
  • Figure 2 is a schematic view, along the cutting plane B-B of Figure 1, of a wheel head in the forming position by rolling on the wall of a tube to be fined.
  • Figure 3 is a schematic plan view showing the lower part of the two carriages of the device according to the invention in the separated position with their combined displacement means.
  • Figure 4 is a plan view of the lower part of the carriages of Figure 3 in the close position, working.
  • Figure 5 is a schematic view of the means for adjusting the end of travel of the carriages of Figures 3 and 4 in the working position.
  • Figure 6 is a schematic top view along the cutting plane A-A of Figure 1 showing the drive means and the transmission means between this drive means and the drive shafts driving the wheel-holder shafts.
  • Figure 7 is a schematic detail view of a wheel in section along a plane containing the axis of the wheel holder shaft.
  • FIG. 1 is a schematic front view of a device 1 allowing the forming on the outer wall of a tube of revolution 2 for heat exchangers of at least one helical fin 3.
  • This device comprises two carriages 4, 5 able to slide parallel to the plane of FIG. 1 on slides 4A, 5A shown in FIGS. 3 and 4. These two carriages are arranged opposite one another on either side another symmetrically of the axis X1-X1 of travel of the tube 2. They each comprise two knobs 6, 7 and 8, 9 fixed in rotation respectively on the shafts carrying the knurling wheel 18, 19 and 20, 21, which are driven in rotation by the drive shafts 24, 25 and 26, 27, by means of a transmission by pairs of gears such as 22 and 23 which are visible in FIG. 2. Each wheel, its wheel-holder wheel and the corresponding motor shaft are mounted on the same wheel holder head.
  • the first two wheel-holder heads 10, 11 are mounted in abutment on the bearing surfaces 14 and 15 of the tool-holder end 4-1 of the carriage 4 and the other two 12 and 13 are in abutment on the bearing surfaces 16 and 17 of the tool-holder end 5-1 of the carriage 5.
  • Each of these wheel-holder heads can be oriented a few degrees around an orientation axis.
  • Each of the four orientation axes X2, X3, X4, X5 is perpendicular to the plane of the corresponding bearing surface 14, 15, 16, 17 of a wheel-holder head on one of the two tool-holder ends 4-1, 5-1.
  • each wheel being supported in its forming zone on the outer wall of the tube 2, driven along the axis of travel X1-X1, the four orientation axes each pass through the forming zone of the corresponding wheel and, under the optimal adjustment conditions, intersect the scroll axis.
  • the orientation axes are distributed at 90 ° from each other around this scrolling axis X1-X1.
  • the carriages 4 and 5 include means of translation allowing either to bring them together, so that the knobs 6, 7, 8, 9 come into the working position against the outer wall of the tube 2, or to separate them one from the other for example every time that a finning phase has been completed or that inspection or maintenance operations should be carried out.
  • FIGS. 3, 4, 5 describe an embodiment of the means for translating the carriages 4, 5.
  • FIG 3 corresponds to the separated position, and Figure 4 to the close position, for which the knobs are in the working position.
  • the scroll axis X1-X1 is indicated in the two figures.
  • the translation means is the jack whose cylinder 31 is housed in the carriage 4 and whose piston 32 moves along a translation axis perpendicular to X1-X1.
  • the end of the rod 33 of this piston 32 which passes below the tilting beam 34 is secured to the carriage 5.
  • the tilting beam 34 is rotatably mounted in its middle around a pivot with a vertical axis X6 which intersects X1-X1.
  • Two rigid rods 35, 36 are connected to the front ends of the carriages 4 and 5 by one of their ends 35A, 36A and by the other end 35B, 36B to the tilting beam. There is thus obtained a symmetrical displacement of the two carriages relative to the axis of travel X1-X1.
  • the cylinder further comprises an auxiliary piston 37, of reduced section, making it possible to quickly separate the two carriages from one another at the end of a finning operation.
  • a means of determining with precision the stopping point of the carriages in the working position makes it possible to clearly define the distance between the axis of the tube and the rollers and therefore the penetration of the latter into the tube.
  • This means comprises a rigid lateral arm 38 connected to the piston rod 33 by one end and connected by the other end, by means of a micrometric screw 39, to a means 40 for controlling the supply of the jack 31 in high pressure fluid.
  • FIG. 5 schematically represents an embodiment of this control means. It can be seen that the rigid arm 38 allows the piston rod 33 to drive the micrometric screw 39 to the point where it bears against a shutter 41 which closes the high pressure fluid intake orifice coming from the pipe. 42 towards the cylinder 31 of the jack and stops its movement. If the movement does not stop, the valve seat 43 moves back and causes the opening of a fluid passage in the direction of the discharge line 44. A return spring 45 closes the valve seat 43 if the piston rod 33 moves back.
  • This means of adjusting the stopping point of the carriages, in a safe and reproducible manner, therefore makes it possible to achieve constant and reproducible positioning of each wheel on the wall of the tube to be finned.
  • FIG. 6 This figure is a top view along the section plane AA of Figure 1. In that Figure 6, only are shown, schematically, the two lower drive shafts 24 and 27 behind the plane of Figure 1, as well as the transmission means which connect them to the single motor means which is also shown diagrammatically.
  • This motor means comprises a direct current motor 50, of high power, with adjustable speed over a wide interval and with high starting torque, connected by a transmission means 51, provided with a toothed pinion 52 to a toothed crown 53, axis X1-X1 of which only the lower half is visible.
  • This ring is mounted on bearing surfaces 53A of an inner tubular support 54 connected to a fixed frame, not shown.
  • a guide tube, not shown, ensures the passage of the tube to be fined inside the tube 54 along X1-X1.
  • FIG. 6 only the two lower pinions 55, 56 are visible which drive the lower drive shafts 57, 58, themselves connected to the lower drive shafts 24, 27.
  • the four drive pinions, such as 55, 56, are distributed uniformly around the ring gear 53, at 90 ° from each other, so that the transmission shafts are also distributed uniformly around the axis X1-X1 of movement on which the ring gear 53 is centered.
  • the four drive shafts such as 57, 58 are telescopic and fitted at their two ends with universal joints. They thus make it possible to drive the four drive shafts and therefore the knurls at the same speed smoothly, even during the translational movements of the carriages 4 and 5.
  • the four knobs 6, 7, 8, 9 with which the device 1 is equipped are of identical structure. They preferably include each a set of revolution disks whose diameters and profile of the forming edges are designed to allow progressive formation of the fins, with successive penetration into the wall of the tube of the forming edges of these rollers, in the grooves already started by the discs of the preceding roll or rollers, following a helical path on the wall of this tube. To obtain such a result, use is made of knurls comprising discs of revolution of increasing diameter and of variable profile.
  • FIG. 7 represents, diagrammatically, a wheel such as for example the wheel 7 of FIGS. 1 and 2, in section, along a plane containing the axis of its wheel-holder shaft 19.
  • This wheel comprises, from its end of small diameter, oriented in the upstream direction of the fin tube 5 forming discs 61, 62, 63, 64, 65 of revolution, which ensure the gradual growth of at least one helical fin thanks to successive passages of discs of increasing diameters in the same grooves.
  • the last two discs 66, 67, of the same diameter as the disc 65, make it possible to equalize the profile of at least one helical fin.
  • the helical course of the rollers on the wall of the tube is achieved thanks to the angle of advance obtained by angular displacement of the roll-holder heads around their axis of orientation.
  • Each of the four knurls must have a different axial setting along the knurling shaft so that the forming edges of the discs penetrate into the grooves formed by the previous discs.
  • This axial offset depends on the angle of advance, and the number of helical fins, that is to say of the propeller threads.
  • This axial offset is obtained by giving the annular rings such as 68, 69, arranged on each side of the rollers such as 7, the desired width.
  • each wheel holder shaft such as 19 has a shoulder 19A located in the immediate vicinity of its drive pinion such as 22.
  • the tightening of the wheel discs against the shoulder 19A is ensured by the nut 70 which bears against the ring 69.
  • Each wheel-holder head such as 11 comes to bear by a flat surface, perpendicular to its axis of orientation X3, against a corresponding surface 15 of the tool-holder end 4-1 of the carriage 4.
  • At least one angular setting means can be slid into at least one of the two intervals e1, e2 (see FIG. 1) existing between a cylindrical rod of revolution 72 secured to the wheel-holder head 11, with an axis perpendicular to the surface of bearing surface 15 and a housing 73 formed in the end of the tool holder 4-1 in which the end of the rod 72 engages.
  • the rotation of the wheel-holder head 11 around the axis X3 takes place around a part of revolution 74 (see FIG. 2) engaged without play in facing housings 75, 76 produced on either side of the bearing plane 15 and held by a threaded rod 77.
  • Parts forming tie rods, such as 78, engaged by one end in an inverted T-shaped groove 79 of the knurling head 11 and by the other in a housing 79A formed in the tool-holder end 4-1, are capable of tightening the wheel-holder head 11 on the seat 15 by means, for example, of a wedge wedge 80, transverse, pulled by a threaded piece 81.
  • each wheel head makes it easy to adjust the distance between the 2 wheel heads of each tool holder and to ensure 90 ° contact between the wheels on the tube depending on the diameter thereof.
  • a metal strip of constant thickness and sufficient surface is introduced into the bearing zone such as 15, this strip, not shown, having holes for the passage of the axial piece 74, tie rods such as 78 and the piece for angular setting 72.
  • the angular setting at 90 ° of the knurling wheels around the tube to be fined is thus adjusted, taking into account the diameter of these knurling wheels as well as the diameter, thickness and reduction rate of this tube.
  • a mandrel 82 housed inside the tube 2 in the forming zone, as shown in FIG. 2.
  • This the mandrel is approximately frustoconical in shape and the slope of its generatrix depends on the conditions of forming of the tube to be finned.
  • This mandrel is secured with a retaining rod 83 whose end upstream, located beyond the upstream end of the tube 2, is mounted to rotate freely, not shown, in the attachment zone at a fixed point. It is also possible to directly mount the free-rotating mandrel 82 on the retaining rod 83.
  • the position of the mandrel is advantageously adjustable axially.
  • each wheel-holder shaft such as 19 is mounted inside the corresponding wheel-holder head such as 11 on bearings such as 84, 85 and is wedged at its two ends by bearings of stop, such as 86, 87, to avoid axial displacements.
  • the corresponding drive shaft such as 25 is mounted on bearings such as 88, 89, arranged on either side of its pinion 23 which meshes with the pinion 22 of the wheel-holder shaft 19.
  • Each wheel-holder head such as 11 (see FIG. 2) is provided with a means of rapid disassembly of the wheels, such as 7, which makes it possible to check the wear of the forming discs as well as the wear of the shaft bearings such as 19, 25 and gear transmissions such as 22, 23.
  • the bearings such as 84 of the wheel shaft 19 and such as 88 of the motor shaft 25, are mounted inside d 'A removable part 90 which is secured to the rest of the structure of the wheel-holder head 11 by a fastening means for rapid assembly and disassembly.
  • This removable part 90 can be removed, after separation of the two carriages 4, 5 from the scroll axis X1-X1, by unscrewing two bolts 91, 92. These bolts ensure the locking of the removable part 90 against a range 93 of the wheel head.
  • the end of the removable part has a projecting abutment edge 94, forming a dihedral, the edge of which engages in a re-entrant edge 95 forming a dihedral of the same angle.
  • the bolt rods 91, 92 inclined at approximately 45 ° relative to the plane of the bearing surface 93 pass through it and are connected to a hooking means 96 located on the other side of the bearing surface 93.
  • the horizontal component of the the tensile force of the bolts 91, 92 thus ensures effective locking of the removable part 90 against the bearing surface 93 and the re-entrant edge 95.
  • the tube is scrolled during finning along the axis X1-X1 along a chute not shown.
  • This metal chute is coated with plastic material to facilitate sliding and avoid any snagging which risks damaging the tube and its fins.
  • detectors not shown used to signal the passage of the front end of the tube.
  • detectors are, for example, of the eddy current type.
  • Each finned zone on a tube uses 2 electrical boxes which are connected to a bus: a box with a detector for switching on the fin, a box with 2 detectors: a controller for switching to the low rotational speed of the knobs , the other controlling the start-up of the return piston and the stop of the knurled rotation.
  • the bus is made up of 3 wires which start from the automaton of the forming device and which run along the guide troughs of the tube which can, for example, be 40 m.
  • the device can thus include 40 bus connection sockets, along the guide troughs, which makes it possible to produce 20 different finned zones along the length of the tube. These 3 bus wires thus avoid 60 wires which would have been necessary if all the detectors had to be wired to the device independently.
  • this bus manages the consistency of the sequential information: for example, if in the middle of a finning operation, information "start of finning" arrives at the PLC because 2 boxes with detectors have been reversed, the bus can handle this kind of error.
  • the start-up of the fin of a tube such as an austenitic stainless steel tube of the type 316 L of about 16 mm of external diameter is carried out in the following way: installation of the smooth tube of a length about 25 m on the chute from downstream.
  • a pinch-roll (drive roller) not shown allows it to be engaged on the mandrel 82 and its retaining rod already secured with its attachment point.
  • the motor is started to drive the four knobs at a reduced speed of around 300 rpm.
  • the cylinder 31 is then started at reduced speed to bring the two carriages 4 and 5 closer to their working position.
  • rollers are then progressively tightened on the wall of the tube 2 supported by the mandrel and the tube is rotated by the rollers in the opposite direction to the rollers, with a determined advance.
  • the speed of rotation of the wheels is accelerated to the speed of about 1400 rpm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Forging (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Earth Drilling (AREA)
  • Catching Or Destruction (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP93420180A 1992-05-06 1993-05-04 Dispositif permettant le formage d'ailettes hélicoidales sur la paroi extérieure de tubes Expired - Lifetime EP0569307B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9205762 1992-05-06
FR929205762A FR2690858B1 (fr) 1992-05-06 1992-05-06 Dispositif permettant le formage d'ailettes helicouidales sur la paroi exterieure de tubes.

Publications (2)

Publication Number Publication Date
EP0569307A1 EP0569307A1 (fr) 1993-11-10
EP0569307B1 true EP0569307B1 (fr) 1996-12-27

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EP93420180A Expired - Lifetime EP0569307B1 (fr) 1992-05-06 1993-05-04 Dispositif permettant le formage d'ailettes hélicoidales sur la paroi extérieure de tubes

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Country Link
US (1) US5365763A (ja)
EP (1) EP0569307B1 (ja)
JP (1) JP2807803B2 (ja)
AT (1) ATE146706T1 (ja)
DE (1) DE69306851T2 (ja)
DK (1) DK0569307T3 (ja)
ES (1) ES2096896T3 (ja)
FR (1) FR2690858B1 (ja)

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Publication number Priority date Publication date Assignee Title
US5916318A (en) * 1997-05-02 1999-06-29 Anderson; Ray C. Machine for simultaneously forming threads or fins on multiple cylindrical workpieces
JP2001018059A (ja) * 1999-07-01 2001-01-23 Mitsubishi Shindoh Co Ltd 内面溝付伝熱管の製造方法および製造装置
CA2324730C (en) * 2000-10-26 2003-08-12 Noetic Eng Inc METHOD OF REDUCING A WIDTH OF A SLIT DANMETHODE OF REDUCING A WIDTH OF A SLIT IN PIPE SLEEVES S PIPE SLEEVES
JP4517604B2 (ja) * 2003-08-21 2010-08-04 住友金属工業株式会社 外面螺旋フィン付きステンレス管の製造方法および外面螺旋フィン付きステンレス管
DE102005063359B4 (de) * 2004-11-09 2010-10-07 DENSO CORPORATION, Kariya-shi Verfahren und Vorrichtung zum Herstellen eines Rillenrohrs und dessen Konstruktion
DE102005052972A1 (de) * 2004-11-09 2006-06-14 Denso Corp., Kariya Doppelwandiges Rohr und dieses verwendende Kühlkreisvorrichtung
JP5929773B2 (ja) * 2013-02-01 2016-06-08 株式会社デンソー 熱交換器用フィン一体型チューブの製造方法および製造装置
CN112296122B (zh) * 2020-10-14 2023-06-30 江苏隆达超合金股份有限公司 高翅片白铜合金高效管制造工艺
CN117564382B (zh) * 2024-01-19 2024-03-26 山东高强紧固件有限公司 一种连接螺栓成型自动加工设备

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DE69306851D1 (de) 1997-02-06
US5365763A (en) 1994-11-22
EP0569307A1 (fr) 1993-11-10
DK0569307T3 (da) 1997-06-16
DE69306851T2 (de) 1997-07-10
JP2807803B2 (ja) 1998-10-08
JPH0639469A (ja) 1994-02-15
FR2690858A1 (fr) 1993-11-12
ES2096896T3 (es) 1997-03-16
ATE146706T1 (de) 1997-01-15
FR2690858B1 (fr) 1994-07-01

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