WO2001002124A1

WO2001002124A1 - Manufacturing device for heating tube with internal grooves and fin rolling roll

Info

Publication number: WO2001002124A1
Application number: PCT/JP2000/004246
Authority: WO
Inventors: Tetsuya Furuuchi; Takao Fukatami; Shin Kikuchi
Original assignee: Mitsubishi Shindoh Co., Ltd.
Priority date: 1999-07-01
Filing date: 2000-06-28
Publication date: 2001-01-11
Also published as: AU5704400A; JP2001018059A; EP1219377A1; KR20020019098A

Abstract

A manufacturing device for heating tube with internal grooves, comprising a fin rolling roll (24) and a supporting roll (26) rolling a W-shaped fin (2) by sandwiching and rolling a metal strip material (T) by these rolls, a plurality of forming rolls (30) for forming the fin (2)-formed strip material in tubular shape so that the fin (2) is positioned on the inner peripheral side, and welding mechanisms (32, 34, 36) for welding both edges of the strip material formed in tubular shape after heating and butting, the fin rolling roll (24) further comprising a plurality of segment rolls (24B) to (24E) disposed coaxially with each other and having outer peripheral surfaces in which fin rolling grooves (25) are formed, these segment rolls being connected divergently with each other.

Description

Description Equipment for manufacturing heat transfer tubes with internal grooves and fin rolls

TECHNICAL FIELD The present invention relates to an apparatus for manufacturing a heat transfer tube with an inner groove having a fin formed on the inner surface of a metal tube to enhance heat exchange efficiency, and a fin roll. Background art

Heat transfer tubes with inner grooves are mainly used as evaporator tubes or condenser tubes in heat exchangers such as air conditioners and refrigerators.In recent years, zigzag fins have been formed over almost the entire inner surface. Heat transfer tubes have been commercialized.

FIG. 10 is a partially developed plan view showing an example of the heat transfer tube with inner grooves 1 on which the zigzag fins 2 are formed. As shown in FIG. 11, the heat transfer tube with inner grooves 1 has a fin rolling roll having rolling grooves 12 on its outer peripheral surface on the surface of the metal plate strip T except for both side edges 6. Using 10 to form zigzag (W-shaped) fins 2 and grooves 4, roll the plate material T into a tube with this fin-forming surface inside and weld the butted 両側 6 on both sides It is manufactured by.

By the way, since it is generally difficult to form the zigzag-shaped rolling groove 12 on the outer peripheral surface of a single roll with high precision as described above, the fin rolling groove of the fin rolling roll 10 is usually used. Is divided along the refraction point of the fin 2 into a plurality of (in this case, four) divided rolls 10B to 10E, and these divided rolls 10B to 1E are divided. A simple spiral groove is formed on the outer peripheral surface of 0E. Then, these divided rolls 10B to 10E are sandwiched between a pair of side rolls 1OA, and these side rolls are pressed by a fastening mechanism, and all the rolls 10A to 10E are used as rotation axes. It was fixed.

Recently, it has been required to increase the line speed in order to increase the production efficiency of heat transfer tubes with internal grooves. Also, in order to increase the heat exchange efficiency of the heat transfer tubes with internal grooves, it is beginning to be required to form fins that are taller than before. like this If the line speed is increased or the tall fins are rolled, the ends of the fin rolling grooves are liable to break at the boundary between the fin rolls 10B to 10E. There was a problem that the life of 0 was short. Since the fin roll 10 is an expensive component, its short life will increase the production cost of the internally grooved heat transfer tube. This problem is particularly caused in the region A where the individual fins 2 are finally formed on the strip with the rotation of the fin rolling roll 10 (i.e., the point is sharpened toward the upstream side in the running direction of the strip. This was remarkable in the region B facing the refraction portion of the fins 12). The reason can be explained as follows. That is, in the process of rolling the fins 2 on the sheet material T by the fin rolling rolls 10 as described above, the individual rolling grooves 12 are formed obliquely to the circumferential direction of the rolls. With the rotation of the forming roll 10, the fins 2 are gradually formed on the sheet material T from one part to another part.

At this time, from the rolling start point of each fin to the rolling end point, as shown by the arrow Y in FIG. 11, metal materials are gathered along the fin rolling groove 12 and the fin rolling is performed. The filling pressure into the groove is highest in the manufacturing end area A. As a result, in region B, an excessive force is repeatedly applied to the end of each fin rolling groove 12, and the partition wall between the fin rolling grooves 12 is easily damaged. In addition, the metal material repeatedly penetrates into the small gap between the boundary between the divided rolls 10B and 10C and between the divided rolls 10D and 10E, and the groove shape is deteriorated at these boundaries. The roll life is shortened.

Furthermore, in the fin rolling end area A, the filling pressure of the metal material into the groove is the highest, so that the fin 2 becomes unnecessarily high compared to the rolling start portion, and the fin rolling groove 1 When 2 comes out, the fin 2 and the edge of the fin rolling groove 12 easily interfere with each other. As a result, in the area B on the outer periphery of the roll corresponding to the area A, there is also a problem that the edge of the fin rolling groove 12 is damaged early, and the life is further shortened. Disclosure of the invention

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is difficult for the fin rolls to be chipped in the process of rolling the fins on the metal plate strip, and the inner grooved transmission can extend the life of the fin rolls. Providing heat tube manufacturing equipment and fin rolls with long life And the subject.

In order to solve the above-mentioned problems, an apparatus for manufacturing a heat transfer tube with an inner groove according to the present invention includes a fin rolling roll for rolling a fin on one surface of a metal strip by rolling the metal strip. A receiving roll; a plurality of forminder rolls for forming the plate material having the fins formed into a tubular shape so that the fins are located on the inner peripheral side; and both ends of the plate material formed into a tubular shape. And a welding mechanism for welding the fin rolls by heating the fin rolls, wherein the fin rolls include a plurality of split rolls having fin roll grooves formed on the outer peripheral surface and arranged coaxially with each other. The split rolls are diffusion bonded to each other.

Before the fin rolling roll, a thickness adjusting mechanism for rolling the plate material and partially adjusting the thickness thereof may be provided. The thickness adjusting mechanism has a function of relatively reducing the thickness of the plate material in a region near the diffusion bonding surface where the fin rolling roll finally forms individual fins on the plate material. Having.

On the other hand, the fin roll of the present invention includes a plurality of split rolls having fin roll grooves formed on the outer peripheral surface and arranged coaxially with each other, and these split rolls are diffusion bonded to each other.

Adjacent split rolls may have different angles of the fin rolling grooves formed on them. Side rolls having a smooth surface may be arranged coaxially on both sides of the fin roll, and these side rolls may be exchangeable with other side rolls having different outer diameters.

Further, the outer diameter of the fin rolling roll and Z or the outer diameter of the receiving roll is determined by a diffusion bonding surface facing an area where individual fins are finally formed on the plate material with the rotation of the fin rolling roll. In the vicinity area, the diameter may be relatively reduced. On the other hand, the fin rolling device of the present invention includes a fin rolling roll and a receiving roll for rolling a fin on one surface of the metal strip by rolling the metal strip therebetween. The fin roll has a plurality of split rolls having a fin roll groove formed on an outer peripheral surface and arranged coaxially with each other, and these split rolls are diffusion bonded to each other.

At both ends in the axial direction of each of the divided rolls, there are tapered portions that decrease in diameter toward both ends in the axial direction. May be formed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view showing a first embodiment of the apparatus for manufacturing a heat transfer tube with inner grooves according to the present invention.

FIG. 2 is a front view showing the vicinity of the fin roll of the manufacturing apparatus.

FIG. 3 is a cross-sectional view of the fin roll of the manufacturing apparatus.

FIG. 4A is a front view showing the vicinity of the fin roll of the second embodiment.

FIG. 4B is a front view showing a modification of the second embodiment.

FIG. 5 is an enlarged cross-sectional view of a sheet material rolled by the manufacturing apparatus of the second embodiment.

FIG. 6 is a front view showing the vicinity of the fin roll of the third embodiment.

FIG. 7 is an enlarged cross-sectional view of a strip material rolled by the manufacturing apparatus.

FIG. 8 is a front view showing the plate member thickness adjusting mechanism of the fourth embodiment.

FIG. 9 is a front view showing a modified example of the plate material thickness adjusting mechanism.

FIG. 10 is a partially developed plan view showing an example of the heat transfer tube with inner grooves.

FIG. 11 is a plan view of a rolling process of a sheet material showing a conventional problem. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, specific examples of the present invention will be described. However, the present invention is not limited to the following embodiments. For example, it goes without saying that the components of these embodiments may be appropriately combined.

[First embodiment]

FIG. 1 is a side view showing a first embodiment of the apparatus for manufacturing a heat transfer tube with inner grooves according to the present invention. This embodiment is for the purpose of forming a heat transfer tube with an inner groove having a W-shaped fin similarly to FIG. 11. The present invention relates to a V-shaped fin or a “WV” type that is bent five times. The present invention can be similarly applied to the manufacture of a heat transfer tube with an inner surface groove having fins. In the figure, reference numeral 20 denotes an anchor for continuously feeding a metal plate strip T having a constant width and a constant thickness. The sheet material T fed out is passed through a pair of holding rolls 22 and between a fin rolling roll 24 and a receiving roll 26 which are arranged opposite to each other. Then, the W-shaped fins 2 and the grooves 4 and the flat side edges 6 (see FIG. 11) are formed on the surface of the sheet material Τ by the fin rolls 24, while the sheet material is formed. The back of Τ is kept smooth.

As shown in FIG. 2, the fin rolls 24 are composed of two divided rolls 24 分割 to 24 を which are coaxially arranged and have an annular shape having the same diameter, and these divided rolls 24 Β to 24 Ε. It consists of a pair of annular side rolls 24 Α coaxially fixed on both sides, and is coaxially fixed to the roll shaft 27 as shown in FIG.

An annular flange portion 29 is integrally formed on the outer peripheral surface on one end side of the roll shaft 27, and a male screw portion 33 is formed on the outer peripheral surface on the other end side. On the outer peripheral surface 27 A between the flange portion 29 and the external thread portion 33, a side roll 24 A, an integrally joined split roll 24 B to 24 E, and a side roll 24 A are sequentially arranged. The rolls 24 A to 24 E are fixed to the roll shaft 27 by screwing the nut 31 into the male screw portion 33. The inner diameter of the rolls 24 A to 24 E at room temperature is made slightly smaller than the outer diameter of the outer peripheral surface 27 A, and the rolls 24 A to 24 E are heated to a high temperature, and the outer peripheral surface 27 It may be baked in A to further prevent rattling.

As shown in FIG. 2, a large number of spiral fin rolling grooves 25 are formed in parallel at a constant pitch over the entire outer surface of the divided rolls 24B to 24E, as shown in FIG. The fin rolling grooves 25 between the adjacent split rolls are symmetrical with respect to the joining surface of the split rolls, so that when the sheet material T is rolled, the W-shaped fins are formed. A large number of grooves 2 and grooves 4 are formed at a constant pitch.

The feature of this embodiment is that the division rolls 24B to 24E are diffusion bonded to each other. That is, the contact surfaces of the split rolls 24B and 24C, 24C and 24D, and 24D and 24E are diffusion-bonded. Diffusion bonding of each divided roll with a conventional divided type roll is usually impossible. This is because if the rolls are mechanically pressed from both sides and fixed without diffusion bonding, there will be no trouble in rolling during normal use, and damage will occur if the rolls are joined together. This is because it becomes impossible to individually replace the split rolls in which the occurrence has occurred. At first, the present inventors also tried means for strongly compressing and fixing each split roll by a fastening mechanism.However, no matter how much the mechanical fastening force was increased, it was sufficiently possible to prevent the occurrence of breakage at the boundary of each split roll. They found that it could not be prevented, and as a result of research, led to the present invention. If the divided rolls 24B to 24E are diffusion bonded to each other, it is impossible to replace the individual divided rolls.However, since the life of the fin rolls 24 is prolonged, replacement of the divided rolls is not possible. What you can't do is not a problem.

To perform diffusion bonding, align the positions of the fin rolling grooves 25 of each of the split rolls 24B to 24E, and press them closely together using a jig, and heat the whole vacuum. It is heated in a furnace to around the recrystallization temperature of the roll material. As a result, atoms are diffused on the contact surfaces of the split rolls 24B to 24E, and the split rolls 24B to 24E are joined to each other. By employing diffusion bonding, it is possible to easily bond the split rolls 24B to 24E formed of a high melting point material such as a cemented carbide. In addition, according to the diffusion bonding, the deformation of the bonding surface is extremely small, and there is no inclusion such as brazing material. Therefore, the shape accuracy is not reduced as compared with the case where the diffusion bonding is not performed. By diffusion bonding of the divided rolls 24B to 24E in this manner, the end faces of the divided rolls 24B to 24E are firmly joined over the entire surface, and the fin rolling grooves 25 are formed. Even the end faces of the groove partition walls (projecting ridges between the fin rolling grooves 25) butted at the bent portion are integrally connected. Therefore, even when the rolling line speed is increased, and when excessive pressure is applied to the bending portion of the fin rolling groove 25 due to the flow of the material or the material flow, the end of the groove partition wall butted by the bending portion remains. It is hard to be broken, and the life of the fin roll 24 can be extended.

Further, in this embodiment, since the side rolls 24A are not diffusion-bonded to the split rolls 24B to 24E, replacement of the side rolls 24A is easy. The side rolls 24 A have the function of forming finless portions 6 having a fixed width on both side edges of the strip T, respectively.The width and thickness of these finless portions 6 have a great effect on ERW. give. Therefore, when the material and thickness of the strip material T are changed, it is necessary to change the size and shape of the side roll 24 A in order to adjust the width and thickness of the finless portion 6. According to this embodiment, the change can be easily performed. It is desirable to prepare several types of side rolls 24 A having different dimensions in advance. A conical surface whose outer diameter gradually decreases toward the side roll 24A is formed near the side roll 24A on the outer peripheral surface of the split rolls 24B and 24E. Is also good. In this case, the thickness (bottom thickness) of the strip T in the groove 4 after rolling is formed so as to gradually increase toward the 緣 portion on both sides of the strip T. In this case, furthermore, in the same part, the depth force of the rolling groove 25 of the split rolls 24 B and 24 E is formed so as to gradually decrease toward the side roll 24 A side, and the plate strip T is formed. The height of the formed fins 2 may be adjusted so as to decrease as approaching the weld. Further, the outer peripheral surface of the side roll 24A may be a tapered surface whose outer diameter decreases toward the outside in the axial direction, thereby reducing the thickness of the sheet material at the finless portion 6. The thickness may be set to be larger than the thickness of the strip material in the groove 4. In any of these cases, it is possible to increase the strength near the weld.

The angle formed by the fin rolling grooves 25 with respect to the roll circumferential direction is a value determined according to the characteristics required for the heat transfer tube P, and is not limited in the present invention. It is preferably about 5 to 25 °. Although the depth of the fin rolling groove 25 is not limited, it is generally about 0.1 to 0.3 mm. If the fins 2 are higher, the higher the fins, the greater the rolling reduction, so that the material flow of the strip material tends to be remarkable, and the effect of the present invention is more easily exhibited. The cross-sectional shape of the fin rolling groove 25 is not limited, and may be a triangular cross-section (the tip may be rounded or pointed), or may be trapezoidal or semi-circular. Good.

As shown in FIG. 1, the sheet material roll formed by the fin rolling rolls 24 and the receiving rolls 26 passes through a pair of forming rolls 30 through a pair of rolls 28 as shown in FIG. The material is gradually rolled into a tube, and the gap between both edges to be abutted by a rolling separator 32 is kept constant, and then passed through an induction heating coil 34 to heat both edges. The tubular strip T which has been formed into a tube and heated is passed through a pair of squeeze rolls 36, and is pressed from both sides so that the heated side edges are abutted and welded. Since a bead is formed on the outer peripheral surface of the heat transfer tube P thus welded by the protruding molten material, a bead cutter 38 for cutting this bead is provided.

The heat-transfer tube P from which the bead has been cut is forcibly cooled through the cooling tank 40 and It is passed through several pairs of sizing rolls 42 and reduced in diameter to a predetermined outer diameter. Further, the reduced-diameter heat transfer tube P is wound up by a rough coiler 44.

Although the dimensions of the heat transfer tube P with an inner groove are not limited in the present invention, when the values of a general heat transfer tube are exemplified, the outer diameter is about 3 to 15 mm, and the thickness of the tube wall in the groove 4 is The height is about 0.15 to 0.5 mm.

The material of the heat transfer tube P with an inner groove is not limited, and various materials such as copper, copper alloy, aluminum, aluminum alloy, and steel can be used.Preferably, copper or copper alloy is used. Among them, phosphorous deoxidized copper (for example, JIS1220 alloy), oxygen-free copper, and the like are particularly preferable.

According to the apparatus for manufacturing a heat transfer tube with an inner groove having the above-described configuration, the end faces of each of the divided rolls 24 B to 24 E are firmly formed over the entire surface by diffusion bonding of the divided rolls 24 B to 24 E. The end faces of the groove walls abutted at the bent portion of the fin rolling groove 25 are also integrally connected. Therefore, when the rolling line speed is increased, when tall fins are rolled, and when excessive pressure is applied to the bending portion of the fin rolling groove 25 due to the flow of material or material, the bending portion is not bent. The ends of the partition walls are not easily damaged, and the life of the fin roll can be extended. In addition, only the fin rolling process of the manufacturing apparatus for the heat transfer tube with inner grooves may be independent as the fin rolling device.

[Second embodiment]

FIG. 4A shows a fin roll roll 24 used in the apparatus for manufacturing a heat transfer tube with internal grooves according to the second embodiment of the present invention. This embodiment is the same as the first embodiment in that the split rolls 24B to 24E are diffusion bonded to each other, but the diameter of the outer peripheral surface of the split rolls 24B to 24E is constant. Instead, in the area near the mating surface of split rolls 24B and 24C and near the mating surface of split rolls 24D and 24E, each split roll 24B The difference is that the outer diameter of の 24 E is relatively reduced, and a taper portion 46 narrowing toward the mating surface is formed. By these four taper portions 46, two concave portions 46A are formed on the outer peripheral surface of the fin roll 24 over the entire circumference. The mating surface of the split rolls 24B and 24C and the mating surface of the split rolls 24D and 24E are rolled by the fin rolls 24 onto the sheet material. During fabrication, the individual fins 2 correspond to the places where they are formed last, and a material flow occurs toward these mating surfaces. That is, the vicinity of these mating surfaces corresponds to the region A on the fin rolling end side in FIG. 11.

If the direction of the axis of the fin rolls 24 is reversed, the material flows toward both ends and the center of each W-shaped fin 2, but in that case, Near the mating surface between the side roll 24A and the split roll 24B, near the mating surface between the split roll 24C and the split roll 24D, and also near the split roll 24E and the cycloid 24 In the vicinity of the mating surface with A, the outer diameter of each of the split rolls 24B to 24E is relatively reduced, and as a result, the outer peripheral surface of the fin roll 24 has four tapered portions. 4 6 should be formed.

The cross-sectional shape of the concave portion 46 A formed by the two tapered portions 46 may be a wide V-shape as shown, or may be a round shape. The width W 1 and the depth D 1 of the concave portion 46 A are determined when the fin 2 is rolled by the fin rolling roll 24, and the mating surface of the split roll 24 B and the split roll 24 C and The fins 2 are formed so that the material flow generated toward the mating surface of the split roll 24D and the split roll 24E can be absorbed in these concave portions 46A, and in the region corresponding to the mating surface. It should be set not to be locally high.

The width W1 and the depth D1 of the recessed part 46 A satisfying this condition are not limited, but in the case of a general heat transfer tube with an inner surface groove, the depth D1 is 3 to 20 times the thickness of the plate material T. %, More preferably about 5 to 10%. If the depth D 1 force of the concave portion 46 A is too small, the phenomenon that the fin 2 becomes high in the region on the fin rolling end side cannot be prevented, and the life of the fin rolling roll 24 is shortened. Conversely, if the depth D1 of the recess 46A is too large, the fin 2 will be too low at the corresponding portion, which will affect the heat exchange performance. Further, the width W1 of the concave portion 46A is preferably 3% or more of the width of the plate material T. If it is too small, the effect of preventing the fin 2 from becoming high in the region on the fin rolling end side decreases. The width W1 of the recess 46A may be equal to the width of two divided rolls. In this case, the outer peripheral surface of each split roll is inclined over the entire surface. Become.

In this embodiment, fin rolls 24 form fins 2, grooves 4, and finless portions 6 as shown in FIG. In this rolling process, the material pressed down to form the groove 4 flows along the fin rolling groove 25 from the fin rolling start side to the fin rolling end side. A concave portion 46 A is formed in the fin rolling end portion of the outer peripheral surface of 4, and the machining amount is small by that amount, so that the material flow is absorbed in these portions, and the depth of the fin rolling groove 25 is deep. Excess metal material can be prevented from entering. Therefore, the height of the fin 2 does not become excessively large in the region corresponding to the concave portion 46A.

At a position corresponding to the concave portion 46A of the fin roll 24, a slight convex portion 50 may be formed on the surface of the plate material T as shown in FIG. However, the thickness is desirably 75% or less of the thickness of the sheet material T before rolling. If it is too large, this part becomes too hard to roll form.

Other configurations may be the same as in the first embodiment. According to the second embodiment, when the fins 2 and the grooves 4 are rolled by the fin rolling rolls 24, the material pressed down to form the grooves 4 is fin-rolled from the fin rolling start side. Even if it flows along the fin rolling groove 25 toward the end side, the material flow can be absorbed by the concave portion 46 A formed on the fin rolling end side portion of the outer peripheral surface of the fin rolling roll 24. However, it is possible to prevent an excessive amount of metal material from penetrating into the fin rolling groove 25. Therefore, the height of the fin 2 does not become excessively high in the area corresponding to the concave portion 46 A, and the interference between the fin 2 and the edge of the fin rolling groove 25 can be prevented, and damage to the edge can be suppressed. The use life of the fin rolls 24 can be prolonged when the split rolls 24B to 24E are diffusion-bonded.

According to the experiments of the present inventors, when the fin rolling rolls in which the split rolls are not diffusion-bonded and the concave portions 46A are not formed are used, 1-2 tons of metal sheet strip material is used. When the roll was rolled, the edge of the fin rolling groove 25 was chipped, and the roll life was exhausted.

In addition, when using rolled fine rolls in which the split rolls are diffusion-bonded but the concave portions 46A are not formed, 3 to 5 tons of metal is required before the end of the roll life. The strip was rolled. In addition, when a fin roll was used in which the concave portion 46 A was formed but the split roll was not diffusion bonded, a 3 to 5 ton metal plate strip was rolled before the end of the roll life. Could be processed.

On the other hand, when the fin rolls 24 formed by diffusing the split rolls 24B to 24E and forming the recesses 46A are used, about 15 tons are required until the roll life is over. Was rolled. Until now, it has not been expected that the combination of diffusion bonding and the formation of the concave portion 46 A can prolong the service life.

[Modification of Second Embodiment]

FIG. 4B shows a modification of the second embodiment. In the second embodiment, each of the split rolls is provided only near the mating surface between the split rolls 24B and 24C and near the mating surface between the split roll 24D and the split port 24E. Although the outer diameters of 24B to 24E were relatively reduced, in this modification, the outer diameters of the side rolls 24A and the split rolls 24B were also reduced. In the vicinity of the mating surface of 4C and the split roll 24D, and also near the mating surface of the split roll 24E and the side roll 24A, each of the split rolls 24B to 24E The outer diameter is relatively reduced, and a taper portion 46 is formed. Thus, eight tapered portions 46 (three concave portions 46 A) are formed on the outer peripheral surface of the fin roll 24. The outer diameter of the side roll 24 A is substantially equal to the minimum diameter of the tapered portion 46. Other configurations may be similar to those of the second embodiment.

According to this embodiment, even when the rotation direction of the fin rolling roll 24 is reversed, it is possible to prevent the fin 2 from becoming high in the region on the fin rolling end side. That is, rolling is performed in a direction in which a material flow occurs toward the mating surface of the split rolls 24B and 24C and the mating surface of the split rolls 24D and 24E. In this case, the mating surface between the side roll 24A and the split roll 24B, the mating surface between the split roll 24C and the split roll 24D, and the split roll 24E and the side roll 24A Even when rolling is performed in the direction in which material flow occurs toward the mating surface of the fins, it is possible to prevent the fin 2 from becoming high in the region on the fin rolling end side. Monkey

The wear on the edges on both sides of each fin rolling groove 25 does not progress evenly.The edge located on the front side in the rotating direction of the knurls is more likely to be made of metal material than the edge located on the rear side. Wear rate is high due to severe collision. In particular, the tendency becomes remarkable near the roll joining surface. In the case of this modified example, when uneven wear occurs on both side edges of each fin rolling groove 25, the fin rolling roll 24 is removed, the both ends of the rotating shaft are reversed, and the roll rotating direction is changed. Conversely, fin rolling can be continued, and the service life of the fin rolling roll 24 can be further extended.

[Third embodiment]

Next, FIG. 6 shows a fin rolling roll 24 and a receiving port 26 in the third embodiment of the present invention. The other parts are the same as in the first embodiment, and the description is omitted. In this embodiment, instead of forming the concave portion 46 A on the fin roll 24, the outer peripheral surface of the receiving roll 26 is provided with a mating surface of the split roll 24 B and the split roll 24 C. , And two concave portions 52 are formed over the entire circumference at positions facing the mating surfaces of the split rolls 24D and 24E, respectively. The width W2 and the depth D2 of the concave portion 52 are set similarly to the concave portion 46A of the second embodiment.

According to such an embodiment, when the fins 2 and the grooves 4 are rolled by the fin rolling rolls 24, a part of the plate material T is elastically deformed into the recesses 52 and escapes. The machining amount in the portion facing 52 is relatively reduced. Therefore, even if the material pressed down when forming the groove 4 flows from the fin rolling start side to the fin rolling end side, the material flow can be absorbed by the concave portion 52, and the fins can be absorbed in these regions. 2 is prevented from becoming excessively high, and as shown in FIG. 7, it is possible to form fins 2 having a substantially uniform height. Therefore, interference between the fin 2 and the edge of the fin rolling groove 25 is reduced, and damage to the edge due to the interference can be prevented. In synergy with the diffusion bonding of the split rolls 24B to 24E, the fin rolling is performed. The service life of the forming rolls 24 can be further extended.

[Fourth embodiment] Next, FIG. 8 shows a main part of a fourth embodiment of the present invention. In this embodiment, instead of changing the shape of the fin rolling roll 24 or the receiving roll 26, the former stage of the fin rolling process shown in FIG. 2 and FIG. Between the fin roll 2 and the fin roll 24, a rolling mechanism for the strip material T shown in FIG. 8 was provided to adjust the thickness of the strip material T.

The rolling mechanism of this embodiment includes a grooving roll 54 and a receiving roll 60 that are arranged to face each other. The outer peripheral surface of the receiving roll 60 is flat, while the outer circumference of the grooving roll 54 is provided. The surfaces are gently projected to the positions corresponding to the mating surfaces of split rolls 24B and 24C and the mating surfaces of split rolls 24D and 24E, respectively. Article 56 is formed. The width W3 and the height D3 of these ridges 56 are not limited, but may be set in the same manner as the width W1 and the depth D1 of the recess 46A in the second embodiment.

In this embodiment, as shown in FIG. 1, the strip material T is continuously fed out from the uncoiler 20, and the fed strip material T is passed through a pair of holding rolls 22 to form a groove opening 5 4. And the receiving roll 60 (not shown in FIG. 1). Then, a pair of shallow concave grooves 58 are formed on the surface of the plate material T by being pressed down by the ridge portions 56.

Next, the sheet material T having a concave groove 58 formed on the surface thereof is passed between the fin rolling roll 24 and the receiving roll 26 shown in FIGS. 4 forms a W-shaped fin 2, a groove 4, and a finless portion 6 (see FIG. 11). At this time, in the vicinity of the fin rolling end point, the groove 58 is previously formed in the strip material T, and the processing amount in the portion facing the groove 58 is relatively reduced. Even if the material rolled down by the forming rolls 24 flows from the fin rolling start side to the fin rolling end side, the concave groove 58 can absorb the material flow, and the fins 2 force is excessive in these areas. It is possible to prevent the fins 2 from being raised and to form the fins 2 having a substantially uniform height. Therefore, the interference between the fin 2 and the edge of the fin rolling groove 25 is reduced, the edge is prevented from being damaged by the interference, and the fin rolling is performed in synergy with the diffusion bonding of the split rolls 24B to 24E. It is possible to extend the service life of the roll 24 at any time.

Also, in another embodiment of the present invention, as shown in FIG. It may be enlarged to about half the width of the strip material T.

Although a plurality of embodiments have been described, the present invention is not limited to the above embodiments, and the features of each embodiment may be appropriately combined. For example, the concave portion 46A may be formed in the fin rolling roll 24, and the concave portion 52 may be formed in the receiving roll 26 at the same time. Further, a plate material thickness adjusting mechanism may be combined. If necessary, the side rolls 24A may be diffusion-bonded integrally with the split rolls 24B to 24E.

As described above, in the apparatus for manufacturing a heat transfer tube with an inner surface groove and the fin rolling roll according to the present invention, the divided rolls are diffusion-bonded to each other, whereby the end faces of the divided rolls are firmly joined over the entire surface. The end faces of the groove partition walls butted at the bent portion of the fin rolling groove are also integrally connected. Therefore, when the rolling line speed is increased, when tall fins are rolled, or when excessive pressure is applied to the bending portion of the fin rolling groove due to Z or material flow, the protrusion at the bending portion is performed. The ends of the fitted groove partition walls are not easily damaged, and the life of the fin roll can be extended.

If the side rolls with smooth surfaces are arranged coaxially on both sides of the fin rolls, and these side rolls can be replaced with other side rolls with different outer diameters, the welding conditions must be changed. Can be easily handled.

Further, when the outer diameter of the fin roll and the roll or the outer diameter of the receiving roll are relatively reduced at the end of the material flow, the fins become excessively high due to the bias of the material. The phenomenon can be prevented. Therefore, the interference between the fin and the edge of the fin rolling groove is reduced, the edge is prevented from being damaged due to collision, and the service life of the fin rolling roll is increased in synergy with the effect of the diffusion joining of the dividing ports to each other. It can be extended at any time.

In addition, a thickness adjustment mechanism is provided in front of the fin roll to adjust the thickness of the strip by rolling the strip, and the strip is thinned at the end of the material flow. In this case, it is possible to prevent the fins from becoming excessively high due to the bias of the material. Therefore, the interference between the fin and the edge of the fin rolling groove is reduced, and the edge is prevented from being damaged by the interference. It is possible to extend the service life of the fin roll at any time. Industrial applicability

In the apparatus for manufacturing a heat transfer tube with an inner groove and the fin rolling roll according to the present invention, the end faces of each of the divided rolls are firmly joined over the entire surface by diffusing and joining the divided holes to each other, so that the fin rolling is performed. Even the end faces of the groove partition walls butted at the bending portion of the groove are integrally connected. Therefore, when the rolling line speed is increased, when tall fins are rolled, and when excessive pressure is applied to the bending part of the fin rolling groove by Z or material flow, the bending part The ends of the butted groove partition walls are not easily damaged, and the life of the fin rolling roll can be extended.

Claims

The scope of the claims

1. A fin rolling port and a receiving roll for rolling fins on one surface of the plate by rolling with a metal plate being interposed therebetween;

A plurality of form rolls for forming the plate material on which the fins are formed into a tubular shape such that the fins are located on the inner peripheral side;

A welding mechanism for heating and butt-welding both end edges of the plate-shaped strip material,

The fin tilling roll includes a plurality of divided rolls having fin rolling grooves formed on an outer peripheral surface and arranged coaxially with each other, and the divided rolls are diffused and joined to each other to manufacture a heat transfer tube with an inner groove. .

2. The apparatus according to claim 1, wherein adjacent split rolls have different angles between the fin rolling grooves formed in the rolls and the circumferential direction of the mouth.

3. The side roll according to claim 1, wherein side rolls having a smooth surface are arranged coaxially on both sides of the fin roll, and these side rolls can be replaced with other side rolls having different outer diameters. Equipment for manufacturing heat transfer tubes with internal grooves.

4. The outer diameter of the fin rolling roll and / or the receiving roll is in the vicinity of a diffusion bonding surface facing a region where individual fins are finally formed on the plate material with the rotation of the fin rolling roll. 2. The apparatus according to claim 1, wherein the diameter of the heat transfer tube is relatively reduced in the region.

5. A thickness adjusting mechanism for rolling the plate material and partially adjusting the thickness thereof before the fin rolling roll is provided before the fin rolling roll. 2. The grooved heat transfer tube according to claim 1, wherein the heat transfer tube has a function of relatively reducing the thickness of the plate material in a region near the diffusion bonding surface where individual fins are formed last on the plate material. Manufacturing equipment.

6. The apparatus for manufacturing a heat transfer tube with an inner surface groove according to claim 1, wherein tapered portions whose diameters are reduced toward both ends in the axial direction are formed at both ends in the axial direction of each of the divided rolls.

7. A fin roll formed by forming a fin rolling groove on the outer peripheral surface thereof and having a plurality of divisional ports arranged coaxially with each other, and these division rolls are diffusion bonded to each other.

8. A fin rolling roll and a receiving roll for rolling fins on one surface of the plate by rolling the metal plate therebetween.

The fin rolling device according to claim 1, wherein the fin rolling roll includes a plurality of divided rolls having a fin rolling groove formed on an outer peripheral surface and arranged coaxially with each other, and the divided rolls are diffusion-bonded to each other.