JP2007038276A - Manufacturing method for offset shaped fin and the fin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for an offset shaped fin, by which biting and rapture of a material do not occur, and continuous working by roll-forming is carried out; and also to provide the fin. <P>SOLUTION: The manufacturing method comprises: a first step, in which a flat plate material 40 A is bent into a projection and depression shape by using a pair of first rollers 5, 5' having projection and depression lines 51, 51' on the surfaces thereof to form a corrugated plate 40B; a second step, in which the inclined surface of a projection and depression line 42 of the corrugated plate is cut by using a pair of second rollers 6, 6' having offset-arranged cutting blades 61, 61' to form an offset part 43; and a third step, in which an offset part, which is offset-cut in the second step, is bent by using a pair of third rollers 7, 7'having offset-arranged projection and depression lines 71, 71' on the surface thereof. Thereby, an offset shaped fin 4 is continuously formed by roll-forming. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an offset shape fin in which an offset shape fin obtained by offsetting the corrugated shape of a corrugated fin is formed by roller molding, and an offset shape fin manufactured by this manufacturing method.

  Conventionally, a heat exchange core is formed by alternately laminating pipes and corrugated fins (outer fins), and a heat exchange fluid that passes through the pipe and heat exchange fluid that passes through the pipe Mold heat exchangers are well known. In this case, in order to improve heat transfer efficiency and improve the performance of the heat exchanger, not only outer fins provided outside the pipeline but also inner fins are provided inside the pipeline. As the shape of the inner fin, a corrugated fin (corrugated fin) may be adopted as in the case of the outer fin. In this case, the flow of fluid in the pipe is simply increased by increasing the heat transfer area. The improvement of heat transfer efficiency cannot be expected so much. Therefore, as shown in FIG. 2, an offset in which a plurality of concavo-convex ridges formed so as to alternately repeat undulations (corrugated shape) and the positions of adjacent concavo-convex ridges are offset in the concavo-convex extending direction is provided. It is known to use shaped fins as inner fins. As a result, the heat exchange fluid flowing in the pipe is repeatedly branched and joined, thereby making the fluid flow turbulent and further improving the heat transfer efficiency.

Since such an offset-shaped fin can be processed by a complicated mold mechanism such as a material presser in a press, conventionally, it has been manufactured by an intermittent press as shown in FIG. In recent years, from the viewpoint of reducing processing costs and equipment area, there is a demand for manufacturing a complicated shape such as an overhang manufactured by an intermittent press by roll forming as shown in FIG.
However, offset-shaped fins used in heat exchangers, etc., adjacent ridges and valleys of adjacent ridges are connected in a relatively long region (about half the ridge or valley). Therefore, each uneven | corrugated strip can be formed only by press work, and has the shape which cannot be applied fundamentally by roll forming which can be continuously bent. If it is going to form by roll forming, the part which the adjacent peak parts and trough parts connected will be pulled in the front-back direction of an uneven | corrugated strip extending direction, and will cause a deformation | transformation. In addition, there is a problem that the material bites into the roller, and it was generally recognized that roll forming is difficult.

Patent Document 1 discloses that this problem is solved and the offset-shaped fins are formed by roll forming. In the manufacturing method of the offset shape fin according to Patent Document 1, in the first roll processing step (a), first, the offset portion is cut and bent by the first processing roll R ₁ as shown in FIG. from the triangular form a preform plate C1, which is arranged in a zigzag Article Subsequently, in the second rolling step (b), the second work roll R _2, intermediate machining plate C1 zigzag Article Bending (offset molding) is sequentially performed at the connection position, and the fin C2 having the predetermined trapezoidal cross-section irregularities connected in a predetermined form is continuously processed.

JP 2001-221588 A

  However, in the method disclosed in Patent Document 1 in which the offset portion is cut and bent into a trapezoidal shape after processing, the length of the coupling portion A with the adjacent convex portion offset as shown in FIG. The thickness T is limited to the material thickness t or less, and the cutting depth is large, and the connecting portion A is greatly deformed (inclined portion → flat portion) in the subsequent bending process, so that the material is transferred to the roller. There is a concern that biting and breakage at the joint A may occur and stable processing cannot be expected.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing an offset-shaped fin that continuously processes a fin having an offset shape by roll forming without causing material biting and breaking. Is to provide an offset shape fin manufactured by

The present invention provides, as means for solving the above-mentioned problems, a method of manufacturing an offset-shaped fin according to each claim and a fin thereof.
In the method for manufacturing the offset-shaped fin according to claim 1, the flat plate member 40A is bent into a concavo-convex shape by a pair of first rollers 5, 5 'having concavo-convex ridges 51, 51' formed on the surface. The inclined surface of the corrugated plate 42 is cut by the first step of forming the corrugated plate 40B and the pair of second rollers 6, 6 'having the cutting blades 61, 61' arranged offset. The offset portion 43 that has been offset-cut in the second step by the second step of forming the offset portion 43 and the pair of third rollers 7 and 7 ′ on which the concave and convex strips 71 and 71 ′ that are offset on the surface are formed. And the third step of bending the workpiece, thereby making it possible to stably manufacture the offset-shaped fins 4 continuously by roll forming without the material biting and breaking, and reducing the processing cost. And equipment area It is possible to achieve the reduction.

  The manufacturing method of the offset shape fin of Claim 2 makes the offset amount D (refer FIG. 5) of the cutting blade of a 2nd process about board | plate thickness, and biting into the roller of the cut | disconnected material is about board | plate thickness. By doing so, the peelability of the material from the roller can be improved, and the biting and breaking of the material can be suppressed.

  According to a third aspect of the present invention, there is provided a method for producing an offset-shaped fin, in which a gap G (see FIG. 6) is provided between the bending teeth arranged offset in the third step, thereby avoiding contact with the material roller. The peelability from the roller can be improved, and the biting and breaking of the material can be suppressed.

  The manufacturing method of the offset shape fin of Claim 4 is the board | plate material in the middle of shaping | molding between 1st roller 5,5 'and 2nd roller 6,6' and 2nd roller 6,6 'and 3rd roller 7,7'. The intermediate roller 8 is arranged so that the plate material can be guided and the behavior thereof can be restricted, and the offset-shaped fin 4 can be stably formed into a roller.

  The offset shape fin according to the fifth aspect is formed by the method for manufacturing the offset shape fin according to the first or second aspect, and enables the manufacture of the offset shape fin 4 similar to the press working by roll forming.

  Hereinafter, a manufacturing method of an offset shape fin according to an embodiment of the present invention and an offset shape fin manufactured by the manufacturing method will be described with reference to the drawings. FIG. 1 is a diagram illustrating an example of a stacked heat exchanger. In the stacked heat exchanger, a plurality of heat transfer tubes 1 are extended in parallel between a pair of headers (not shown), and corrugated fins (outer fins) 2 are arranged between the heat transfer tubes 1. That is, the heat transfer tubes 1 and the outer fins 2 are alternately laminated to form a heat exchange core part. Thereby, heat exchange is performed between the heat exchange medium F1 flowing through the heat transfer tube 1 and the heat exchange medium F2 passing through the outer fin 2 outside the heat transfer tube 1.

In this case, in order to promote heat exchange between the heat exchange media F1 and F2, it is common practice to insert and arrange the inner fins 3 in the heat transfer tube 1 as shown in FIG. As the inner fin 3, an offset-shaped fin 4 as shown in FIG. Such an offset-shaped fin 4 includes a plurality of concave and convex strips 4A to 4E formed so as to repeat the concave and convex portions, and the adjacent concave and convex strips (4A, 4B), (4B, 4C), (4C, 4D). ) And (4D, 4E) are offset (shifted) in the direction in which the projections and recesses extend. Moreover, these uneven | corrugated strips 4A-4E are mutually couple | bonded by the coupling | bond part 41. FIG. That is, the convex portions and the concave portions of each of the ridges 4A to 4E are partially joined. It is possible to make the length T of the connecting portion 41, which is impossible in the prior art, longer than the plate thickness t.
It is also possible to use the offset shape fin 4 as the outer fin 2.

  Next, the manufacturing method of the offset shape fin of this embodiment is demonstrated. FIG. 3 is a process layout when roll forming offset-shaped fins, and FIG. 4 is a diagram showing a roller shape in each process. The flat plate material 40A, which is the material of the offset-shaped fins 4, is continuously supplied by being unwound from a coiled state as shown in FIG. The plate material 40A is first supplied vertically and supplied between a pair of first rollers 5 and 5 'that rotate in the same direction. The surface of each first roller 5, 5 ′ is formed with uneven stripes 51, 51 ′ as shown in a partially enlarged view in FIG. 4, and passes between the meshing first rollers 5, 5 ′, As shown in FIG. 3A, the corrugated plate 42B is formed by being bent into an uneven strip 42. This is the first step of roll forming.

  The plate material 40A processed into the corrugated plate 40B in the first step is subsequently introduced between a pair of second rollers 6 and 6 'that are also arranged vertically and rotate in the same direction. On the surface of each of the second rollers 6 and 6 ', there are provided cutting blades 61 and 61' arranged offset as shown in FIG. When passing between the two rollers 6 and 6 ', the offset portion 43 on the inclined surface of the corrugated strip 42 in the corrugated plate 40B is cut and processed by offset cutting as shown in FIG. A plate 40C is formed. This cutting step is the second step of roll forming. FIG. 5 shows the cutting blades 61 and 61 ′ in an enlarged manner. In this case, the offset amount D of the cutting blades 61 and 61 ′ is set to the thickness of the plate 40A.

  The corrugated plate 40C that has been offset-cut in the second step is then introduced between a pair of third rollers 7 and 7 'that are also arranged vertically and rotate in the same direction. On the surface of each of the third rollers 7, 7 ', there are formed waveforms 71, 71' in which the ridges are arranged offset as shown in FIG. Accordingly, when the offset-cut corrugated plate 40C passes between the meshing third rollers 7 and 7 ', the offset portion 43 is bent, and the final offset shape as shown in FIG. The fin 4 is obtained. This is the third step of roll forming. FIG. 6 is a diagram showing an enlarged surface of the third rollers 7 and 7 ′, and a gap G is provided between the bent teeth of the corrugations 71 and 71 ′ arranged in an offset manner to form the third rollers 7 and 7 ′ of the plate material. To avoid contact. In addition, the board | plate material which passed through the 3rd process is cut | disconnected by predetermined length at the next process, and becomes the final offset shape fin 4. FIG.

  As described above, in the offset shape fin manufacturing method of the present embodiment, the offset shape fin 4 is formed by dividing the cutting and bending of the offset portion 43 of the corrugated plate 40B into the second step and the third step. Roll forming can be performed without causing the roller to bite. Moreover, since the attitude | position of the coupling | bond part 41 of each offset uneven | corrugated strip does not change (it remains flat), a deformation | transformation is suppressed, The fracture | rupture of the coupling | bond part 41 can be suppressed and the stable process of the offset-shaped fin 4 is possible. . Further, the offset amount D of the cutting blades 61 and 61 'is set to about the plate thickness, and the gap G is provided between the bent teeth of the corrugated waves 71 and 71' arranged in an offset manner, thereby making it possible to release the plate material from the rollers 6 and 7. It can improve and can suppress the biting and breaking of the plate material.

  In the above-described embodiment, the offset-shaped fin 4 is formed through the three steps of the first to third steps. However, the wave-shaped bending step that is the first step can be omitted. . In this case, the wave-shaped bending and the offset portion are simultaneously cut in the second step.

  FIG. 7 is a diagram illustrating an arrangement of rollers for explaining a method of manufacturing an offset shape fin according to another embodiment. In this other embodiment, the first to third steps and the pair of first to third rollers 5, 6 and 7 have the same roller shape as the above-mentioned embodiment, but the first roller 5 and the second roller. 6 and intermediate rollers 8 are arranged between the second roller 6 and the third roller 7, respectively. The intermediate roller 8 guides the plate materials 40B and 40C in the middle of processing, and can feed the plate material with an appropriate tension. In this way, the plate material 40B, 40C is passed through the intermediate roller 8 to restrict the behavior of the plate material, thereby enabling more stable processing.

As described above, in the present invention, offset-shaped fins can be manufactured by roll forming, so that high-speed machining of offset-shaped fins is possible, and processing costs, equipment costs, equipment areas, energy costs, etc. are significant. Reduction is possible.
In addition, the offset shape fin of this invention is used suitably as an inner fin of the oil cooler which is a heat exchanger.

It is a fragmentary perspective view of a lamination type heat exchanger. It is a perspective view of an offset shape fin. It is a figure explaining the manufacturing method of the offset shape fin of embodiment of this invention, (a) Bending of 1st process, (b) Cutting of offset part of 2nd process, (c) Offset part of 3rd process The bending of each is shown. It is a figure which shows each roller shape in the manufacturing method of the offset shape fin of embodiment of this invention with an enlarged view. It is an enlarged view of the cutting blade of a 2nd roller. It is an enlarged view of the surface structure of a 3rd roller. It is a figure explaining the roller arrangement | positioning in the manufacturing method of the offset shape fin of another embodiment of this invention. It is a figure explaining manufacture of the fin by the conventional press work. It is a figure explaining the conventional roll forming. Procedures for manufacturing offset shape fins according to the prior art, (a) cutting and bending of offset portion as first roll processing step, (b) offset forming as second roll processing step, and (c) joint portion FIG.

Explanation of symbols

1 Heat transfer tube 2 Corrugated fin (outer fin)
3 Inner fins 4 Offset shape fins 4A to 4E Concavity and convexity 40A Flat plate material 40B Corrugated shape plate 40C Corrugated shape plate cut by offset 41 Coupling portion 42 Concavity and convexity 43 Offset portion 5, 5 ′ First roller 51, 51 ′ Concavity and convexity 6, 6 'Second roller 61, 61' Cutting blade 7, 7 'Third roller 71, 71' Waveform with offset arrangement 8 Intermediate roller

Claims (5)

In the method of manufacturing an offset-shaped fin in which a plurality of concavo-convex ridges (4A to 4E) formed so as to repeat the concavo-convex, and the concavo-convex ridges adjacent to each other are offset in the concavo-convex extending direction,
(1) A plate-shaped plate material (40A) is bent into a concavo-convex shape by a pair of first rollers (5, 5 ') having concavo-convex ridges (51, 51') formed on the surface thereof, and a corrugated plate (40B A first step of forming
(2) A pair of second rollers (6, 6 ') having cutting blades (61, 61') arranged offset to cut the inclined surface of the corrugated strip (42) of the corrugated plate to offset A second step of forming the part (43);
(3) The offset portion (43) that has been offset-cut in the second step by the pair of third rollers (7, 7 ') on which concave and convex strips (71, 71') arranged on the surface are formed is formed. A third step of bending,
The manufacturing method of the offset shape fin characterized by comprising.   A method of manufacturing an offset-shaped fin, characterized in that the offset amount D of the cutting blade in the second step is set to about the plate thickness, and the cut material is bitten into the roller by about the plate thickness.   The manufacturing method of the offset shape fin characterized by providing the clearance gap between the bending teeth arrange | positioned by offset of the 3rd process, and avoiding a contact with the roller of material.   Forming between the first roller (5, 5 ') and the second roller (6, 6') and between the second roller (6, 6 ') and the third roller (7, 7'). The method for manufacturing an offset-shaped fin according to claim 1, wherein an intermediate roller (8) for guiding the plate material in the middle is arranged.   An offset shape fin formed by the method of manufacturing an offset shape fin according to any one of claims 1 to 4.

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