EP1219377A1 - Manufacturing device for heating tube with internal grooves and fin rolling roll - Google Patents

Manufacturing device for heating tube with internal grooves and fin rolling roll Download PDF

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Publication number
EP1219377A1
EP1219377A1 EP00942365A EP00942365A EP1219377A1 EP 1219377 A1 EP1219377 A1 EP 1219377A1 EP 00942365 A EP00942365 A EP 00942365A EP 00942365 A EP00942365 A EP 00942365A EP 1219377 A1 EP1219377 A1 EP 1219377A1
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EP
European Patent Office
Prior art keywords
roll
fin
rolls
plate material
divided
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.)
Withdrawn
Application number
EP00942365A
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German (de)
English (en)
French (fr)
Inventor
Tetsuya Mitsubishi Shindoh Co. Ltd. FURUUCHI
Takao Mitsubishi Shindoh Co. Ltd. FUKATAMI
Shin Mitsubishi Shindoh Co. Ltd. KIKUCHI
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.)
Mitsubishi Shindoh Co Ltd
Original Assignee
Mitsubishi Shindoh Co Ltd
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 Mitsubishi Shindoh Co Ltd filed Critical Mitsubishi Shindoh Co Ltd
Publication of EP1219377A1 publication Critical patent/EP1219377A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same
    • 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
    • B21C37/083—Supply, or operations combined with supply, of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills

Definitions

  • the present invention relates to an apparatus for manufacturing a grooved-inner-surface heat transfer tube, formed with fins on an inner face of a metal tube for increasing heat transfer efficiency, and to a fin roll.
  • a grooved-inner-surface heat transfer tube is used mainly as an evaporator tube or a condenser tube in heat exchangers for air-conditioners or cooling apparatus and the like. Recently, heat transfer tubes formed with zigzag shape fins over substantially the entire inner surface have been produced.
  • FIG. 10 is a partially spread open plan view showing an example of a grooved-inner-surface heat transfer tube 1 formed with zigzag shaped fins 2.
  • this grooved-inner-surface heat transfer tube 1 is manufactured by using a fin roll 10 having rolling grooves 12 formed on the outer peripheral surface to form zigzag shaped (W shaped) fins 2 and grooves 4 on the entire surface of a metallic plate material T with the exception of both edge sections 6, and then rolling the plate material T into a tube shape with the surface on which the fins are formed on the inside, and welding the adjoining edge sections 6 together.
  • the region for forming the fin rolling grooves of the fin roll 10 is divided into a plurality of divided rolls 10B to 10E (in this case 4), by dividing up along the bend points of the fins 2, and respective simple spiral grooves are formed on the outer peripheral surfaces of these divided rolls 10B to 10E. Furthermore, these divided rolls 10B to 10E are clamped by a pair of side rolls 10A, and these side rolls are pressed by a fastening mechanism, so that all of the rolls 10A to 10E are secured to a rotation shaft.
  • the metal material is gathered together along the fin rolling grooves 12, and at the fin rolling end region A, the filling pressure into the grooves is a maximum.
  • the region B an excessive force is repeatedly applied to the tips of each of the fin rolling grooves 12, and the wall between the fin rolling grooves 12 is thus susceptible to damage.
  • the groove shape deteriorates at these boundaries, and the roll life is shortened.
  • the fins 2 become higher than is necessary, so that when the fins 2 comes out from the fin rolling grooves 12, the edges of the fins 2 and the fin rolling grooves 12 are likely to interfere.
  • the edge of the fin rolling grooves 12 is rapidly damaged, so that the life is even further shortened.
  • the present invention takes the above circumstances into consideration, with an object of providing an apparatus for manufacturing a grooved-inner-surface heat transfer tube, for which chipping in the fin roll are unlikely to occur in the process of rolling a fin in a metal plate material, so that the life of the fin roll can be extended, and of providing a fin roll with a long life.
  • an apparatus for manufacturing a grooved-inner-surface heat transfer tube of the present invention comprises; a fin roll and a receiving roll which roll fins on one surface of a metallic plate material by clamping the plate material and rolling, a plurality of forming rolls which form the plate material formed with the fins into a tube such that the fins are positioned on the inside, and a welding mechanism which heats opposite edges-of the plate material which has been formed into a tube and abuts together and welds, and the fin roll comprises a plurality of coaxially arranged divided rolls with fin rolling grooves formed in an outer peripheral surface, and these divided rolls are diffusion bonded to each other.
  • This thickness adjusting mechanism may have a function which relatively reduces the thickness of the plate material, in a region close to the diffusion bonded surfaces which finally form the individual fins on the plate material.
  • the fin roll of the present invention comprises a plurality of coaxially arranged divided rolls with fin rolling grooves formed on an outer peripheral surface, and these divided rolls are diffusion bonded to each other.
  • the adjacent divided rolls may be such that the angles of the fin rolling grooves formed therein, are different from each other. Furthermore, on opposite sides of the fin roll, there may be coaxially arranged side rolls with smooth surfaces, and these side rolls may be able to be replaced with the other side rolls with different outer diameters.
  • the outer diameter of the fin roll and/or the receiving roll may be relatively reduced in a region near diffusion bonded.surfaces which face a region where the individual fins are finally formed on the plate material with rotation of the fin roll.
  • a fin rolling apparatus of the present invention comprises a fin roll and a receiving roll which roll fins on one surface of a metallic plate material by clamping the plate material and rolling, and the fin roll comprises a plurality of coaxially arranged divided rolls with fin rolling grooves formed in an outer peripheral surface, and these divided rolls are diffusion bonded to each other.
  • each of the divided rolls there may be formed taper portions with the diameter reduced towards the opposite axial ends.
  • FIG. 1 is a side view showing an embodiment of an apparatus for manufacturing a grooved-inner-surface heat transfer tube according to the present invention.
  • This embodiment is an apparatus for forming a grooved-inner-surface heat transfer tube having "W" shaped fins, similar to in FIG. 11, although the invention may also be applied to the manufacture of a grooved-inner-surface heat transfer tube having V shaped fins or "VVV" shaped fins with five bends.
  • numeral 20 represents an uncoiler for continuously feeding a metallic plate material T of uniform width and uniform thickness.
  • the fed plate material T passes through a pair of presser rolls 22 and is then passed between a fin roll 24 and a receiving roll 26 which are positioned opposing one another.
  • the fin roll 24 forms the "W" shaped fins 2, the grooves 4 and the two flat edge sections 6 (refer to FIG. 11) on the upper surface of the plate material T, while the underside of the plate material remains smooth.
  • the fin roll 24 comprises; divided rolls 24B to 24E of the same diameter which are coaxially arranged so as to form an annular shape, and a pair of annular side rolls 24A which are coaxially secured to either end of these divided rolls 24B to 24E. As shown in FIG. 3, these are coaxially secured to a roll shaft 27.
  • An annular flange 29 is integrally formed on an outer peripheral surface of one end of the roll shaft 27, and an external thread portion 33 is formed on the outer peripheral surface of the other end.
  • An outer peripheral surface 27A-between the flange 29 and the external thread portion 33, is sequentially passed through the side roll 24A, the integrally connected divided rolls 24B to 24E, and the side roll 24A, and by tightening a nut 31 on the external thread portion 33, the rolls 24A to 24E are secured to the roll shaft 27.
  • the inner diameter of the rolls 24A to 24E at normal temperature is made slightly smaller than the outer diameter of the outer peripheral surface 27A, and by heating the rolls 24A to 24E to a high temperature these are seized onto the outer peripheral surface 27A, so that any play is further prevented.
  • the helical fin rolling grooves 25 are multiply formed at a fixed pitch over the entire surface.
  • the fin rolling grooves 25 of adjacent divided roll pairs are face symmetrical with the divided roll contact surfaces as a boundary.
  • the feature of this embodiment is that, the divided rolls 24A to 24E are diffusion bonded to each other. That is to say, the contact surfaces of the divided rolls 24B and 24C, 24C and 24D and 24D and 24E are diffusion bonded. Diffusion bonding of each of the divided roll pairs in conventional divided rolls, is normally not done. This is because, if the divided roll group is pressed and secured from opposite ends without diffusion bonding, then under normal use there are no problems during rolling, but if the divided rolls are bonded to each other, a divided roll in which damage occurs cannot be individually replaced.
  • the present inventors also at first tested a method for strongly press securing each of the divided rolls by means of a fastening machine. However it was seen that no matter how high the mechanical fastening strength, the occurrence of failure at the boundary portion of each divided rolls could not be sufficiently prevented.
  • the present invention was arrived at from the results of this study. If the divided rolls 24B to 24E are diffusion bonded to each other, replacement of individual divided rolls becomes impossible. However since the life as such of the fin roll 24 is extended, the fact that the divided roll cannot be replaced is not a problem.
  • the positions of the fin rolling grooves 25 of each divided roll 24B to 24E are aligned.
  • the divided rolls are then pressed and tightly contacted with each other using a jig, and the whole body is placed in a vacuum heating oven and heated until close to the recrystallisation temperature of the roll material.
  • atomic diffusion occurs at the contact face of the divided rolls 24B to 24E, so that the divided rolls 24B to 24E are bonded to each other.
  • the bonding of the divided rolls 24B to 24E formed from a high melting point material such as cemented carbide is also easily performed.
  • inclusions such as of brazing material do also not exist.
  • the shape accuracy also does not drop.
  • the side rolls 24A are not diffusion bonded to the divided rolls 24B to 24E, replacement of the side rolls 24A is easy.
  • the side rolls 24A have the function of respectively forming the fixed width finless portions 6 on the opposite side edges of the plate material T.
  • the width and thickness of these finless portions 6 exerts a considerable influence on the electrical seam welding. Consequently, in the case where the material or the thickness or the like of the plate material T is changed, there is a requirement to change the dimensions or shape of the side rolls 24A in order to adjust the width or thickness of the finless portion 6.
  • the side rolls 24A are prepared in several kinds with different dimensions.
  • a conical surface with the outer diameter gradually reducing towards the side roll 24A side may be formed on the outer peripheral surface of the divided rolls 24B and 24E, in the vicinity of the side rolls 24A.
  • the after rolling thickness (bottom thickness) of the plate material T inside the grooves 4 is formed so as to gradually increase towards the opposite side edge portions of the plate material T.
  • the depth of the rolling grooves 25 of the divided rolls 24B and 24E is formed so as to gradually decrease towards the side rolls 24A side, and the height of the fins 2 formed in the plate material T may be adjusted so as to reduce as these approach the welding portion.
  • the outer peripheral surfaces of the side rolls 24A may be made taper surfaces with the outer diameter reducing towards the axially outer sides.
  • the plate material thickness at the finless portion 6 may be set so as to be greater than the plate material thickness inside the groove 4. In both of these cases, the strength in the vicinity of the weld portion can be increased.
  • the angle of the fin rolling grooves 25 with respect to the roll peripheral direction is a value which is determined according to the characteristics demanded for the heat transfer tube P. In this invention, while not limited, this is preferably 5 to 25° for a standard grooved-inner-surface heat transfer tube.
  • the depth of the fin rolling grooves 25 is also not limited, however in general, this is made from around 0.1 to 0.3 mm. If the fins 2 are too high, the rolling press down amount (draft) becomes high. Therefore the material flow of the plate material tends to become noticeable, and to that extent, the results of the present invention are easily demonstrated.
  • the cross-section shape of the fin rolling grooves 25 is not limited. This may be a cross-section triangular shape (the leading edge may be round or may be pointed) or may be a trapezoidal shape or a semi-circular shape.
  • the processed plate material T which has been rolled by the fin roll 24 and the receiver roll 26, as shown in FIG. 1, passes through a pair of rolls 28, and is then gradually rounded into a tube shape by passage through a plurality of pairs of forming rolls 30. Then, with the spacing between the two edge sections which are to be adjoined maintained at a uniform distance by a rolling separator 32, the edge sections are heated by passage through an induction heating coil 34.
  • the heated tube shaped plate material T then passes through a pair of squeeze rolls 36 so that the heated edge sections are adjoined by means of pressure from both sides, and welded. Beads resulting from exuded melted material form on the outer peripheral surface of a heat transfer tube P welded in this manner, and a bead cutter 38 is provided for cutting away these beads.
  • the heat transfer tube P which has had the beads removed is forcibly cooled by passage through a cooling tank 40, and is then reduced to a predetermined diameter by passage through a plurality of pairs of aligned sizing rolls 42.
  • the heat transfer tube P of reduced diameter is then wound by a rough coiler 44.
  • the dimension of the grooved-inner-surface heat transfer tube P is not limited in this invention, however taking the numerical values for a standard heat transfer tube as an example, the outer diameter is around 3 to 15 mm, and the thickness of the tube wall at the groove 4 interior is around 0.15 to 0.5 mm.
  • the material for the grooved-inner-surface heat transfer tube P is not limited, and a wide variety of materials such as copper, copper alloy, aluminum, aluminum alloy, steel etc. can be used.
  • copper or copper alloy is adopted, and of this, in particular phosphor deoxidized copper (for example JIS 1220 alloy) or oxygen-free copper or the like is ideal.
  • the end faces of the respective divided rolls 24B to 24E are strongly bonded over the entire face, and are integrally connected even at the end face pairs of the respective groove walls which are abutted at the bend portions of the fin rolling grooves 25. Consequently, also in the case where the rolling fin speed is increased, and in the case where tall fins are rolled, and/or in the case where an excessive pressure is applied to the bend portions of the fin rolling grooves 25 due to material flow, the ends of the groove walls which are abutted at the bend portions are not susceptible to failure, and the life of the fin roll can be extended.
  • the fin-roll forming process of the above apparatus for manufacturing the grooved-inner-surface heat transfer tube may be made independent as a fin roll apparatus.
  • FIG. 4A shows a fin roll 24 used in an apparatus for manufacturing a grooved-inner-surface heat transfer tube, of a second embodiment.
  • This embodiment is similar to the first embodiment from the point that the divided rolls 24B to 24E are diffusion bonded to each other. However these differ from the point that the diameters of the outer peripheral surfaces of the divided rolls 24B to 24E are not uniform, and in the vicinity of the adjoining surface between the divided roll 24B and the divided roll 24C, as well as in the vicinity of the adjoining surface between the divided roll 24D and the divided roll 24E, the external diameter of each of the divided-rolls 24B to 24E is reduced relatively, so that taper portions 46 tapering towards the adjoining surfaces are formed.
  • two concave portions 46A are formed in the outer peripheral surface of the fin roll 24 around the entire periphery.
  • the adjoining surface between the divided roll 24B and the divided roll 24C and the adjoining surface between the divided roll 24D and the divided roll 24E correspond with the last sections of each fin 2 formed during the rolling of the fins 2 on to a plate material T using the fin roll 24, and a material flow develops in the direction of these adjoining surfaces.
  • the regions near these adjoining surfaces correspond to the regions A of FIG. 11 at the fin rolling end side.
  • each divided roll 24B to 24E in the vicinity of the adjoining surface between the side roll 24A and the divided roll 24B, in the vicinity of the adjoining surface between the divided roll 24C and the divided roll 24D, and in the vicinity of the adjoining surface between the divided roll 24E and the side roll 24A should be reduced relatively, so that four taper portions 46 would be formed on the outer peripheral surface of the fin roll 24.
  • the cross sectional shape of the concave portions 46A constituted by the two taper portions 46 may be a wide "V" shape as shown in the figure, or may also be a rounded shape.
  • the width W1 and the depth D1 of the concave portions 46A should be set so that when rolling of the fins 2 is conducted using the fin roll 24, the material flow produced in the direction of the adjoining surface between the divided roll 24B and the divided roll 24C and the adjoining surface between the divided roll 24D and the divided roll 24E can be absorbed within the concave portions 46A, and the fins 2 are not higher in the localized regions corresponding to the aforementioned adjoining surfaces.
  • the depth D1 of the concave portions 46A should preferably be between 3 to 20% of the thickness of the plate material T, with values between 5 to 10% being even more desirable. If the depth D1 of the concave portions 46A is insufficient, then the phenomenon where the fins 2 are higher in the regions at the fin rolling end side cannot be prevented, and the life of the fin roll 24 is shortened. In contrast, if the depth D1 of the concave portions 46A is too great, then the fins 2 become too low at the corresponding sections, which will affect the heat transfer performance.
  • the width W1 of the concave portions 46A should preferably be at least 3% of the width of the plate material T. If the width W1 is too narrow then the desired effect of preventing the phenomenon of the fins 2 being higher in the regions at the fin rolling end side diminishes.
  • the width W1 of the concave portions 46A may also be made equal to the width of two entire divided rolls. In such a case, the entire outer peripheral surface of each divided roll is inclined.
  • the fins 2, the grooves 4 and the finless portions 6 shown in FIG. 5 are formed by the fin roll 24.
  • the material which is pressed in order to form the grooves 4 flows along the fin rolling grooves 25 from the fin rolling start side towards the fin rolling end side.
  • the concave portions 46A are formed in the fin rolling end side portion of the outer peripheral surface of the fin roll 24, and hence the working amount for that part is small. Therefore, the material flow is absorbed by these parts, so that surplus metallic material can be prevented from intruding into the innermost of the fin rolling grooves 25. Consequently, the height of the fins 2 at the region corresponding to the concave portions 46A does not become excessively large.
  • a slightly protruding portion 50 as shown in FIG. 5 may be formed.
  • the protruding amount thereof is preferably less than 75% of the thickness of the plate material T for prior to rolling. This is because, if too large this portion is hardened, so that the roll forming becomes difficult.
  • the fins 2 no longer become excessively tall at the region corresponding to the concave portions 46A, interference of the fins 2 with the edge of the fin rolling grooves 25 can be prevented, damage to the edge can be suppressed, and in combination with the diffusion bonding of the divided rolls 24B to 24E, the useful life of the fin roll 24 can be further extended.
  • FIG. 4B shows a modified example of the second embodiment.
  • the second embodiment only in the vicinity of the adjoining surface between the divided roll 24B and the divided roll 24C, and in the vicinity of the adjoining surface between the divided roll 24D and the divided roll 24E, is the outer diameter of the each of the divided rolls 24B to 24E relatively reduced.
  • the vicinity of the adjoining surface between the side roll 24A and the divided roll 24B the vicinity of the adjoining surface between the divided roll 24C and the divided roll 24D, and also in the vicinity of the adjoining surface between the divided roll 24E and the side roll 24A, is the outer diameter of each of the divided rolls 24B to 24E relatively reduced, and a taper portion 46 formed.
  • taper portions 46 are formed on the outer peripheral surface of the fin roll 24. Furthermore, the outer diameter of the side rolls 24A is made approximately equal to the minimum diameter of the taper portions 46. Other construction may be similar to that of the second embodiment.
  • the phenomena where the fins 2 become high at the region of the fin rolling end side can be prevented. That is to say, also in the case where rolling is performed in a direction to generate material flow towards the adjoining surface between the divided roll 24B and the divided roll 24C, and the adjoining surface between the divided roll 24D and the divided roll 24E, and also in the case where rolling is performed in a direction to generate material flow towards the adjoining surface between the side roll 24A and the divided roll 24B, and the adjoining surface between the divided roll 24C and the divided roll 24D, and also the adjoining surface between the divided roll 24E and the side roll 24A, the phenomena where the fins 2 become high at the region of the fin rolling end side can be prevented.
  • FIG. 6 shows a fin roll 24 and a receiving roll 26 in a third embodiment of the present invention. Other parts are similar to those of the first embodiment, and hence description is omitted.
  • the concave portions 46A are not formed on the fin roll 24, and instead two concave portions 52 are formed at locations respectively corresponding to the adjoining surface between the divided roll 24B and the divided roll 24C, and the adjoining surface between the divided roll 24D and the divided roll 24E, around the entire periphery.
  • the width W2 and the depth D2 of the concave portions 52 is set to the same as that of the concave portions 46A of the second embodiment.
  • the working amount at the portion corresponding to the concave portions 52 is relatively reduced since a part of the plate material T is elastically deformed and relieved into the concave portions 52. Consequently, even if the material which is forced down when the grooves 4 are formed flows from the fin rolling start side towards the fin rolling end side, this material flow will be absorbed by the concave portions 52, and so any excessive increase in height of the fins 2 in these regions can be prevented, and as shown in FIG. 7, fins 2 for which the height is substantially uniform can be rolled.
  • FIG. 8 shows the essential elements of a fourth embodiment of the present invention.
  • a rolling mechanism for the plate material T as shown in FIG. 8 is provided before the fin rolling process illustrated in FIG. 2 and FIG. 3, that is to say, between the presser rolls 22 and the fin roll 24 in FIG. 1, and the thickness of the plate material T is adjusted.
  • the rolling mechanism of this embodiment is equipped with a grooved roll 54 and a receiving roll 60 which are disposed facing one another, and whereas the outer peripheral surface of the receiving roll 60 is flat, respective gradual protruding portions 56 are formed on the outer peripheral surface of the grooved roll 54, at positions corresponding with the adjoining surface between the divided roll 24B and the divided roll 24C, and the adjoining surface between the divided roll 24D and the divided roll 24E.
  • width W3 and height D3 of these protruding portions 56 although they should be set in the same manner as the width W1 and the depth D1, respectively, of the concave portions 46A of the second embodiment.
  • the plate material T is fed continuously from the uncoiler 20, and the fed plate material T passes through a pair of presser rolls 22 and is then passed between the grooved roll 54 and the receiving roll 60 (not shown in FIG. 1). As a result, the plate material is forced down by the protruding portions 56, and a pair of shallow concave grooves 58 are formed in the surface of the plate material T.
  • the plate material T with the concave grooves 58 formed in the surface thereof is passed between the fin roll 24 and the receiving roll 26 shown in FIG. 2 and FIG. 3, and W-shaped fins 2, grooves 4 and finless sections 6 (refer to FIG. 11) are formed by the fin roll 24.
  • the width of the protruding portions 56 may be increased to approximately half of the width of the plate material T.
  • the present invention is not limited to these embodiments, and the characteristics of the respective embodiments may be appropriately combined.
  • the concave portions 46A in the fin roll 24 may also be formed in the receiving roll 26.
  • the adjustment mechanism for the plate material thickness may be combined.
  • side rolls 24A, if required may be integrally diffusion bonded to the divided rolls 24B to 24E.
  • the end faces of the respective divided rolls are strongly bonded over the entire face, and are integrally connected even at the end face pairs of the groove walls which are abutted at the bend portions of the fin rolling grooves. Consequently, also in the case where the fin rolling speed is increased, in the case where tall fins are rolled, and/or in the case where an excessive pressure is applied at the bend portions of the fin rolling grooves due to material flow, the ends of the groove walls which are abutted at the bend portion are not susceptible to failure, and the life of the fin roll can be extended.
  • the outer diameter of the fin roll and/or the receiving roll is relatively reduced at a location which constitutes the end of the material flow, the phenomena attributable to the bias of the material, where the fin becomes excessively high can be prevented. Consequently, interference of the fin with the edge of the fin rolling grooves can be reduced, damage to the edge due to interference can be prevented, and in combination with the effect of diffusion bonding of the divided rolls to each other, the useful life of the fin roll can be further extended.
  • the fin roll there is provided a thickness adjusting mechanism which rolls the plate material to partially adjust the thickness thereof, so that the plate material is made thin at the location which constitutes the end of the material flow, the phenomena attributable to the bias of the material, where the fin becomes excessively high can be prevented. Consequently, interference of the fin with the edge of the fin rolling grooves can be reduced, damage to the edge due to interference can be prevented, and in combination with the effect of diffusion bonding of the divided rolls to each other, the useful life of the fin roll can be further extended.
  • the end faces of the respective divided rolls are strongly bonded over the entire face, and are integrally connected even at the end face pairs of the groove walls which are abutted at the bend portions of the fin rolling grooves. Consequently, also in the case where the fin rolling speed is increased, in the case where tall fins are rolled, and/or in the case where an excessive pressure is applied at the bend portions of the fin rolling grooves due to material flow, the ends of the groove walls which are abutted at the bend portion are not susceptible to failure, and the life of the fin roll can be extended.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
EP00942365A 1999-07-01 2000-06-28 Manufacturing device for heating tube with internal grooves and fin rolling roll Withdrawn EP1219377A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP11188264A JP2001018059A (ja) 1999-07-01 1999-07-01 内面溝付伝熱管の製造方法および製造装置
JP18826499 1999-07-01
PCT/JP2000/004246 WO2001002124A1 (fr) 1999-07-01 2000-06-28 Appareil de fabrication de tubes de chauffage a rainures interieures et cylindre de laminage d'ailettes

Publications (1)

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EP1219377A1 true EP1219377A1 (en) 2002-07-03

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EP00942365A Withdrawn EP1219377A1 (en) 1999-07-01 2000-06-28 Manufacturing device for heating tube with internal grooves and fin rolling roll

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EP (1) EP1219377A1 (ja)
JP (1) JP2001018059A (ja)
KR (1) KR20020019098A (ja)
AU (1) AU5704400A (ja)
WO (1) WO2001002124A1 (ja)

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WO2021254882A1 (en) * 2020-06-15 2021-12-23 Hydro Extruded Solutions As Embossing roll

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US20230278085A1 (en) * 2020-06-15 2023-09-07 Hydro Extruded Solutions As Apparatus and method for pre-forming a metal strip for the manufacture of roll formed and welded tubes
CN115156287B (zh) * 2022-07-07 2024-06-14 中南大学 高性能铝合金带筋壁板轧挤复合-蠕变时效成形制造方法

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JP2749673B2 (ja) * 1989-11-30 1998-05-13 古河電気工業株式会社 伝熱管およびその製造方法
FR2690858B1 (fr) * 1992-05-06 1994-07-01 Escofier Tech Sa Dispositif permettant le formage d'ailettes helicouidales sur la paroi exterieure de tubes.

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WO2021254882A1 (en) * 2020-06-15 2021-12-23 Hydro Extruded Solutions As Embossing roll

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JP2001018059A (ja) 2001-01-23
KR20020019098A (ko) 2002-03-09
AU5704400A (en) 2001-01-22
WO2001002124A1 (fr) 2001-01-11

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