JP5915640B2 - Heat exchanger fin manufacturing apparatus, heat exchanger fin manufacturing method, and heat exchanger manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger fin manufacturing apparatus, a heat exchanger fin manufacturing method using the manufacturing apparatus, and a heat exchanger manufacturing method using a heat exchanger fin manufactured by the heat exchanger fin manufacturing method .

  A conventional heat exchanger fin manufacturing apparatus includes a slit processing mold that forms inter-row slits between rows of collar portions formed on a thin metal plate forming a fin material. As an example of such a manufacturing apparatus, a manufacturing apparatus described in Patent Document 1 can be given.

  The slit machining die has an upper blade and a lower blade for cutting a metal thin plate with a predetermined stepwise dimension. When the upper blade and the lower blade are engaged with the metal thin plate, a slit extending in the fin step direction is formed in the metal thin plate. Moreover, the shape of the both ends of the upper blade and the lower blade in the progressive direction of the metal thin plate was, for example, an arc shape. In addition, the curvature radius of the circular arc of each of these end portions was generally the same.

Japanese Patent Laid-Open No. 10-160378

  By the way, when the slits between rows are formed on the metal thin plate, if the meshing amount between the upper blade and the lower blade, that is, the allowance increases, a phenomenon occurs in which the metal thin plate divided by the slits between the rows is twisted. It was. The amount of twist of such a metal thin plate tended to increase as the allowance between the upper blade and the lower blade increased.

The present invention relates to a heat exchanger fin manufacturing apparatus in which the metal thin plate is less likely to be twisted when forming slits between rows with respect to the metal thin plate forming the fin material, a heat exchanger fin manufacturing method using the manufacturing apparatus, and It aims at providing the heat exchanger manufacturing method using the fin for heat exchangers manufactured by the fin manufacturing method for the same heat exchanger .

  A heat exchanger fin manufacturing apparatus that solves the above-mentioned problems is a slit that forms inter-row slits between rows of the collar portions with respect to the metal thin plate that forms the fin material on which the collar portions for inserting the heat transfer tubes are formed. The slit machining die has an upper blade and a lower blade arranged opposite to each other, and the upper blade and the lower blade are arc-shaped at both ends in the progressive direction of the metal thin plate. And at least one of the upper blade and the lower blade is such that the radius of curvature of the arc at the inlet side end of the thin metal plate in the progressive direction is larger than the radius of curvature of the arc at the outlet side end, The arc at the inlet end is closer to the other blade than the arc at the outlet end.

  According to such a configuration, since the arc of the inlet side end of at least one of the upper blade and the lower blade is closer to the arc of the inlet side end of the other blade than the arc of the outlet side end, The upper and lower blades can mesh with each other at a shallow position. For this reason, it is possible to reduce the allowance between the upper blade and the lower blade necessary for obtaining a necessary slit length. Thereby, when forming the slit between rows with respect to the metal thin plate which makes a fin raw material, it becomes difficult to produce a twist in a metal thin plate.

  The fin manufacturing apparatus for a heat exchanger that solves the above-mentioned problem is such that the radius of curvature of the arc at the inlet side end of the upper blade is the radius of curvature of the arc at the outlet side end of the upper blade, and the inlet side end of the lower blade It is preferable that the radius of curvature of the arc is larger than the radius of curvature of the arc of the outlet side end of the lower blade.

  When forming the continuous slit extended in the step direction of a fin with respect to a metal thin plate, it is preferable to suppress that a slit interrupts on the way. For this reason, the metal thin plate is fed forward at a feed pitch shorter than the length of the slit formed in the metal thin plate by the meshing of the upper blade and the lower blade. Thereby, a slit is sequentially formed in the aspect partially overlapped with the slit formed previously. For this reason, the continuous slit extended in the step direction of a fin is formed with respect to a metal thin plate.

  By the way, when the above-described continuous slit is formed, the outlet side end portion of the upper blade enters the slit formed by the inlet side end portion of the upper blade by the previous processing after the metal thin plate is sequentially fed. Thus, the overlapping portion of the slit is formed by the upper blade cutting the metal thin plate a plurality of times, so that the cut surface is likely to be deformed. For this reason, in consideration of such deformation of the cut surface of the overlapping portion of the slit, it is preferable to suppress in advance the deformation of the cut surface of the tip portion of the slit that can be the overlapping portion of the slit.

  Here, in the arc shape, the larger the radius of curvature, the less the deformation of the cut surface of the thin metal plate. Therefore, the radius of curvature of the arc at the inlet end of the upper blade is the radius of curvature of the arc at the outlet end of the upper blade, the radius of curvature of the arc at the inlet end of the lower blade, and the radius of curvature of the outlet edge of the lower blade. By making it larger than the radius of curvature of the arc, it is possible to suppress deformation of the cut surface of the tip portion of the slit. For this reason, it is possible to form a continuous slit with high accuracy on a thin metal plate.

  The fin manufacturing apparatus for a heat exchanger that solves the above-described problem is such that the slit machining die forms the inter-row slits in the metal thin plate by meshing the upper blade with the lower blade. The upper blade is preferably changeable in the vertical position with respect to the lower blade.

  According to such a configuration, by changing the vertical position of the upper blade relative to the lower blade, the allowance between the upper blade and the lower blade can be changed without changing the stroke of the upper blade. For this reason, the length of the slit formed in the metal thin plate can be changed. That is, by changing the feed pitch of the metal thin plate, a continuous slit and a perforated slit can be formed on the metal thin plate. For this reason, since it is not necessary to change a slit process metal mold | die according to the kind of slit to form, the manufacturing cost of a fin can be made low.

Heat exchanger fins manufacturing method for solving the above problems is to use the heat exchanger fin manufacturing apparatus.
According to such a structure, since the said manufacturing apparatus can suppress the twist of a metal thin plate when forming a slit between rows with respect to a metal thin plate, the precision of the slit between rows is improved. Thereby, the fin of the stable quality can be provided.

The heat exchanger manufacturing method which solves the said subject uses the fin for heat exchangers manufactured by the said fin manufacturing method for heat exchangers .
According to such a structure, the quality of the fin used for a heat exchanger is stabilized. For this reason, the heat exchanger of the stable quality can be provided.

According to the heat exchanger fin manufacturing apparatus, the heat exchanger fin manufacturing method , and the heat exchanger manufacturing method , the metal thin plate is twisted when the slits between the rows are formed in the metal thin plate forming the fin material. Can be difficult.

It is a figure regarding the fin of the cross fin tube type heat exchanger concerning an embodiment, (a) is a top view and (b) is an AA sectional view. It is the whole heat exchanger fin manufacturing apparatus schematic, Comprising: The processing procedure is shown. The top view of the metal thin plate in the process G. FIG. The side view of the slit process metal mold | die in the fin manufacturing apparatus for the same heat exchanger. The front view of the slit process metal mold | die in the fin manufacturing apparatus for the same heat exchanger. It is a figure regarding the slit process metal mold | die in the fin manufacturing apparatus for heat exchangers, Comprising: The front view of the slit process metal mold | die of the state which the blade edge of the upper blade and the blade edge of the lower blade mesh | engaged when forming a continuous slit. The front view of the slit process metal mold | die in the conventional fin manufacturing apparatus for heat exchangers. It is a figure regarding the slit process metal mold | die in the fin manufacturing apparatus for heat exchangers which concerns on embodiment, Comprising: The front view of a slit process metal mold | die when forming a perforation slit. It is a figure regarding the slit process metal mold | die in the fin manufacturing apparatus for heat exchangers, Comprising: The front view of the slit process metal mold | die of the state which the blade edge of the upper blade and the blade edge of the lower blade mesh | engaged when forming a perforation slit.

  A specific example of the heat exchanger fin manufacturing apparatus will be described below with reference to the drawings. Note that the heat exchanger fin manufacturing apparatus is not limited to these examples, but is indicated by the scope of the claims, meanings equivalent to the scope of the claims, and all modifications within the scope of the claims. Is intended to be included.

[Description of fins for heat exchanger manufactured by this manufacturing apparatus]
First, a schematic configuration of the heat exchanger fin according to the present embodiment will be described.
As shown to Fig.1 (a), this fin 1 for heat exchangers is used for heat exchangers, such as an indoor unit of an air conditioner, for example, Comprising: The color for making a heat exchanger tube penetrate in zigzag form Part 10 is provided. As an example, the collar portion 10 is formed in two rows and six stages. As an example, a set of four bulging fins (hereinafter referred to as louver fins 20) is formed between the rows of each row of the collar portion 10. Between the rows of the collar portions 10, perforated slits 30 </ b> A that are cut in the step direction are formed.

  As shown in FIG. 1B, the collar portion 10 is formed with a large-diameter, dish-shaped seat portion 11 that forms a small rise. The seat portion 11 has a guide function when the fins 1 are stacked. Further, a vertical cylindrical portion 12 is formed above the seat portion 11. The vertical cylindrical portion 12 functions as a portion into which the heat transfer tube 40 is inserted, and improves heat transfer between the heat transfer tube 40 and the fins 1. For this reason, the heat transfer tube 40 is expanded after being inserted into the collar portion 10 formed into a predetermined shape. In addition, a flared portion 13 is formed above the vertical cylindrical portion 12. The flared portion 13 has a function of maintaining a constant pitch when the fins 1 are stacked.

  The louver fin 20 improves the heat transfer coefficient of the fin 1 by a so-called leading edge effect. The louver fin 20 is cut in the step direction, and has a shape raised from the base of the fin 1 at both ends in the step direction. In addition, what is shown by FIG. 1 is an example of the shape of the louver fin 20, As a shape of the louver fin 20, various shapes are employable.

[Overview of the heat exchanger fin manufacturing equipment]
Next, an outline of a fin manufacturing apparatus for manufacturing such a fin 1 will be described.
As shown in FIG. 2, the present fin manufacturing apparatus includes an uncoiler 50 in which a thin metal plate P such as aluminum that forms the material of the fin 1 is wound in a coil shape. The thin metal plate P is sent from the uncoiler 50 to the press device 52 via the loop controller 51.

  The press device 52 has a lower die fixed to the bed and an upper die fixed to the slide of the press device 52. In the fin manufacturing apparatus, the steps in manufacturing the fin 1 are diverse. For this reason, it is difficult to accommodate the dies for each process within the length range of the metal thin plate P of the single press device 52 in the progressive direction. For this reason, in the press device 52, the lower die set 52A supporting the lower die is extended to the lower side in the progressive direction of the metal thin plate P. Similarly, the upper die set 52B supporting the upper die is also extended to the lower side in the forward feeding direction. Furthermore, the overhang member 52C is extended outward in the progressive direction of the metal thin plate P so as to compensate for the shortage of the extension dimension of the upper die.

  In the present embodiment, a shearing device 70 that performs a shearing process, which is the final process of manufacturing the fin 1, is attached to the tip of the overhang member 52C. Further, a collar part processing die 60 for forming the collar part 10 on the metal thin plate P is supported by an upper die set 52B and a lower die set 52A in the press device 52. Furthermore, the slit die 100 for forming the perforated slit 30A (see FIG. 1) and the continuous slit 30B (see FIG. 3) between the molded collar portions 10 is an upper die set 52B and a lower die. It is supported by the part extended from the press apparatus 52 in the set 52A. A pitch feeder 80 for controlling the pitch feed of the metal thin plate P is installed in a portion extended from the press device 52 in the lower die set 52A.

Each of the steps A to I shown in the table of FIG. 2 is performed by the single press device 52 configured as described above.
In step A, the louver fin 20 is processed. In the process B to the process F, the processing of the collar portion 10 is sequentially performed. The metal thin plate P on which the collar portion 10 is formed through the process F is subjected to the inter-row slit processing and trimming processing in the step G. In the process H, the entire pitch feed is performed by the pitch feeder 80. In step I, which is the final step, shearing is performed in which the metal thin plate P is cut to a predetermined length. The thin metal plate P is completed as the heat exchanger fin 1 with the process I as the final process.

  In addition, the completed fin 1 is accommodated in the stacker 53 arrange | positioned at the lower side of the process I. The stacker 53 has a plurality of pins 53A that are erected in the vertical direction. By inserting the pins 53A into the collar portion 10, the fins 1 are laminated at a constant pitch.

  Further, the fin manufacturing apparatus is configured such that each step proceeds simultaneously in a plurality of rows so as to manufacture a plurality of fins from the metal thin plate P at the same time as a conventionally known device. It should be noted that the number of fin rows can be set or fins having different numbers of rows can be simultaneously processed depending on which row of slits between successive rows is performed. Moreover, the number of fins manufactured simultaneously is determined by these settings. For example, in the case of the two rows and six stages of fins 1 shown in FIG. 1, the number of sheets produced at the same time is 20 or more. Are arranged in parallel.

[Description of Process G]
As shown in FIG. 3, in the process G, the perforated slit 30A and the continuous slit 30B are formed in the metal thin plate P. Such perforated slits 30 </ b> A and continuous slits 30 </ b> B are formed by the slit machining die 100. In FIG. 3, for convenience of explanation, only the portions constituting the adjacent two rows and six stages of fins 1 in the metal thin plate P sequentially transferred to the process G are illustrated.

  The perforated slit 30A is formed for the purpose of reducing heat conduction between the inlet side heat transfer tube 40 and the outlet side heat transfer tube 40 in a heat exchanger such as an outdoor coil used as a condenser. Yes. By forming the perforated slit 30A, liquefaction and supercooling of the refrigerant can be promoted.

On the other hand, the continuous slits 30 </ b> B are continuous slits formed in the step direction between the rows of the collar portions 10 in order to divide the rows.
[Slit processing mold configuration]
As shown in FIG. 4, the slit machining die 100 has an upper blade hold 110, an upper blade 120, a lower blade hold 130, and a lower blade 140.

  The upper blade hold 110 supports the upper blade 120. The upper blade hold 110 is attached to the upper die set 52B. The upper blade hold 110 can change the vertical position by changing the fixed position with respect to the upper die set 52B. The lower blade hold 130 is attached to the lower die set 52A. The lower blade hold 130 supports the lower blade 140.

[Configuration of upper and lower blades of slitting mold]
As shown in FIG. 5, in the upper blade 120, the inlet side end portion 121 and the outlet side end portion 122 have an arc shape in the progressive feeding direction of the metal thin plate P. The radius of curvature R of the arc of the inlet side end 121 is larger than the radius of curvature r of the arc of the outlet side end 122. Further, when the distance YA between the cutting edges 123 of the upper blade 120 and the cutting edge 143 of the lower blade 140 is the distance YA between the cutting edges, the distance LA between the arc of the inlet side end 121 and the lower blade 140 is It is shorter than the distance LB between the arc and the lower blade 140. That is, the arc of the inlet side end 121 is closer to the lower blade 140 than the arc of the outlet side end 122.

  The lower blade 140 has an arcuate shape at the inlet side end 141 and the outlet side end 142 in the progressive direction of the thin metal plate P. The radius of curvature r of the arc of the inlet side end portion 141 and the arc of the outlet side end portion 142 is the same as the radius of curvature r of the arc of the outlet side end portion 122 of the upper blade 120.

[Effects of slit machining dies when forming continuous slits]
Next, the operation of the heat exchanger fin manufacturing apparatus when forming the continuous slit 30B will be described. 5 to 9, illustration of the metal thin plate P is omitted for convenience of explanation.

  As shown in FIG. 5, when the upper blade 120 is in the upper position and is separated from the lower blade 140 with a distance YA between the blade edges, the metal thin plate P that has undergone the process F is placed on the lower blade 140 by the pitch feeder 80. To a predetermined position. Next, when the pressing device 52 is operated, the upper blade 120 is lowered.

  As shown in FIG. 6, the upper blade 120 is engaged with the lower blade 140 with a predetermined insertion allowance ZA, so that a slit having a length XA is formed in the thin metal plate P. The upper blade 120 moves up after forming a slit with a length XA in the thin metal plate P.

  After the upper blade 120 is lifted, the metal thin plate P is transferred in the progressive direction at a feed pitch of length XA or less. By repeating the lowering / raising operation of the upper blade 120 described above, a continuous slit 30B in which a part of the end of the slit of length XA overlaps is formed on the metal thin plate P.

  As shown in FIG. 7, in the conventional upper blade 520, the radius of curvature r of the arc of the inlet side end 521 and the radius of curvature r of the arc of the outlet side end 522 are the outlet side end of the upper blade 120 of this embodiment. It is equal to the radius of curvature r of the arc of the portion 122. For this reason, at the distance YA between the blade edges, the distance LC between the arc of the inlet side end 521 and the lower blade 140 is longer than the distance LA of the present embodiment.

  As indicated by a two-dot chain line in FIG. 6, according to the conventional upper blade 520, the distance LC is longer than the distance LA of the present embodiment. It is necessary that the upper blade 520 and the lower blade 140 mesh with each other with an allowance ZB larger than ZA.

As mentioned above, the fin manufacturing apparatus of this embodiment can make the allowance of the upper blade 120 with respect to the lower blade 140 when forming the continuous slit 30B smaller than before.
[Effects of slitting mold when forming perforated slits]
Next, the operation of the heat exchanger fin manufacturing apparatus when forming the perforated slit 30A will be described.

  As shown in FIG. 8, when the perforated slit 30A is formed, the upper blade 120 is present at an upper position than when the continuous slit 30B is formed. That is, the inter-blade distance YB between the upper blade 120 and the lower blade 140 when forming the perforated slit 30A is longer than the inter-blade distance YA when forming the continuous slit 30B. Note that such a change in the distance between the cutting edges is performed by changing the fixed position of the upper blade hold 110 with respect to the upper die set 52B shown in FIG.

As shown in FIG. 9, when the upper blade 120 is engaged with the lower blade 140 with a predetermined allowance ZC, a slit of length XB is formed in the thin metal plate P.
Here, the stroke of the press device 52 is the same when the continuous slit 30B is formed and when the perforated slit 30A is formed. On the other hand, the inter-blade distance YB when forming the perforated slit 30A is longer than the inter-blade distance YA when forming the continuous slit 30B. For this reason, the allowance ZC when forming the perforated slit 30A is smaller than the allowance ZA when forming the continuous slit 30B. As a result, the length XB is shorter than the length XA. The upper blade 120 moves up after forming a slit of length XB in the metal thin plate P.

  After the upper blade 120 is raised, the metal thin plate P is transferred in the progressive direction at a feed pitch of length XB or more. By repeating the lowering / raising operation of the upper blade 120 described above, the metal thin plate P is formed with a plurality of length XB slits with predetermined intervals. That is, the perforated slit 30A is formed in the metal thin plate P.

  As shown by a two-dot chain line in FIG. 9, according to the conventional upper blade 520, in order to obtain a slit having a length XB based on the same idea as that for forming the continuous slit 30B as described above, It is necessary for the upper blade 520 and the lower blade 140 to mesh with each other with an allowance ZD larger than the allowance ZC.

As described above, the fin manufacturing apparatus according to the present embodiment can reduce the allowance of the upper blade 120 with respect to the lower blade 140 when forming the perforated slit 30A as compared with the related art.
[Effect of the embodiment]
Since the heat exchanger fin manufacturing apparatus according to the present embodiment is configured as described above, the following effects can be obtained.

  (1) The arc of the inlet-side end 121 of the upper blade 120 is closer to the lower blade 140 than the arc of the outlet-side end 122 by having a larger radius of curvature R than the arc of the outlet-side end 122. . For this reason, the upper blade 120 and the lower blade 140 can mesh with each other at a shallower position. For this reason, the allowance of the upper blade 120 with respect to the lower blade 140 for obtaining the required slit length XA and length XB can be reduced. Accordingly, when the perforated slit 30A and the continuous slit 30B are formed on the metal thin plate P, the metal thin plate P is hardly twisted.

  (2) When forming the continuous slit 30B with respect to the metal thin plate P, it is preferable to suppress that the slit is interrupted in the middle. For this reason, the metal thin plate P is fed forward at a feed pitch shorter than the length XA of the slit formed in the metal thin plate P by the engagement of the upper blade 120 and the lower blade 140. Thereby, a slit is sequentially formed in the aspect partially overlapped with the slit formed previously. In this way, a continuous slit 30B extending in the step direction of the fin 1 is formed.

  Here, when the continuous slit 30B is formed, the outlet side end 122 of the upper blade 120 enters the slit formed by the inlet side end 121 of the upper blade 120 by the previous processing after the metal thin plate P is fed forward. . As described above, the overlapping portion of the slit is formed by the upper blade 120 cutting the metal thin plate P a plurality of times, so that the cut surface of the metal thin plate P is likely to be deformed. For this reason, in consideration of such deformation of the cut surface of the overlapping portion of the slit, it is preferable to suppress in advance the deformation of the cut surface of the tip portion of the slit that can be the overlapping portion of the slit.

  Here, in the arc shape, the larger the radius of curvature, the less likely the deformation of the cut surface of the thin metal plate P is. In the fin manufacturing apparatus of the present embodiment, the radius of curvature R of the arc of the inlet side end 121 of the upper blade 120 is the radius of curvature r of the arc of the outlet side end 122, and the radius of curvature of the arc of the inlet side end 141 of the lower blade 140. It is larger than the radius r and the curvature radius r of the arc of the outlet side end 142 of the lower blade 140. For this reason, the deformation | transformation of the cut surface of the front-end | tip part of a slit can be suppressed previously.

  (3) The fin manufacturing apparatus according to the present embodiment has a virtual upper blade in which the radius of curvature r of the arc at the outlet end 122 of the upper blade 120 is a large radius of curvature such as the arc of the inlet end 121. The manufacturing apparatus has the following advantageous effects.

  That is, when the blade span of the upper blade 120 of this embodiment is the same as that of the virtual upper blade, and the insertion allowance ZA when forming the continuous slit 30B is the same, the virtual upper blade is the top of this embodiment. A slit longer than the blade 120 can be formed in the metal thin plate. For this reason, when the virtual upper blade is used, the overlapping portion of the slit formed in the continuous slit 30B becomes longer than when the upper blade 120 is used.

  By the way, when forming the overlapping part of the slit, when the exit side end 122 of the upper blade 120 enters the slit that has already been formed, the position of the exit side end 122 and the already formed slit is shifted, There is a risk of so-called “beard”. That is, when forming an overlapping portion in the continuous slit 30 </ b> B, there is a risk of “beard” being generated.

  In this respect, the upper blade 120 of the present embodiment has a larger radius of curvature of only the arc of the inlet-side end 121, and therefore, when the continuous slit 30B is formed compared to the case of using a virtual upper blade. The overlapping part can be shortened. For this reason, when forming the continuous slit 30 </ b> B, it is possible to reduce an area where a “whisker” may occur.

  (4) By changing the position of the upper blade 120 in the vertical direction with respect to the lower blade 140, the allowance of the upper blade 120 with respect to the lower blade 140 can be changed without changing the stroke of the press device 52. For this reason, the length of the slit formed in the metal thin plate P can be changed. Thereby, by changing the feed pitch of the metal thin plate P, the perforated slit 30A and the continuous slit 30B can be formed in the metal thin plate P. For this reason, since it is not necessary to change the slit process metal mold | die 100 according to the kind of slit to form, the manufacturing cost of the fin 1 can be made low.

  (5) By manufacturing the fin 1 using this manufacturing apparatus, when forming the perforation slit 30A or the continuous slit 30B with respect to the metal thin plate P, the metal thin plate P becomes difficult to twist. As a result, a stable quality fin 1 can be provided.

(6) By manufacturing a heat exchanger using the fin 1 manufactured using this manufacturing apparatus, a heat exchanger having a stable quality can be provided.
[Modification]
In the said embodiment, it can also change as follows. The following modifications can be combined with each other within a technically consistent range.

The radius of curvature of the arc of the inlet side end 141 of the lower blade 140 may be the same as the radius of curvature of the arc of the inlet side end 121 of the upper blade 120.
Of the upper blade 120 and the lower blade 140, only the radius of curvature of the arc of the inlet side end 141 of the lower blade 140 is the arc of the inlet side end 121 of the upper blade 120, the arc of the outlet side end 122, and the lower It is good also as a curvature radius larger than the circular arc of the exit side edge part 142 of the blade 140. FIG.

  The perforated slit 30A can be changed to a target perforated slit that allows the fins 1 to be easily divided between rows.

P ... Metal thin plate 1 ... Heat exchanger fin 10 ... Collar portion 11 ... Seat portion 12 ... Vertical cylindrical portion 13 ... Reflair portion 20 ... Louver fin 30A ... Perforated slit 30B ... Continuous slit 40 ... Heat transfer tube 50 ... Uncoiler 51 ... Loop controller 52 ... Pressing device 52A ... Lower die set 52B ... Upper die set 52C ... Overhang member 53 ... Stacker 52A ... Pin 60 ... Color part processing die 70 ... Shearing device 80 ... Pitch feeder 100 ... Slit processing die 110 ... Upper blade hold 120 ... Upper blade 121 ... Inlet side end 122 ... Outlet side end 123 ... Blade edge 130 ... Lower blade hold 140 ... Lower blade 141 ... Inlet side end 142 ... Outlet side end 143 ... Blade edge 520 ... Upper blade 521 ... End side end 522 ... Outlet side end

Claims (5)

Inter-row slits (30A, 30B) between rows of the collar portion (10) with respect to the metal thin plate (P) forming the fin material formed with the collar portion (10) for inserting the heat transfer tube (40) A slit machining die (100) for forming
The slit machining die (100) has an upper blade (120) and a lower blade (140) arranged to face each other.
The upper blade (120) and the lower blade (140) are arc-shaped at both ends in the progressive direction of the metal thin plate (P),
At least one of the upper blade (120) and the lower blade (140) has a radius of curvature of the arc of the inlet side end (121, 141) of the thin metal plate (P) in the forward feed direction. Since the radius of curvature of the arc of (122, 142) is larger, the arc of the inlet side end (121, 141) approaches the other blade than the arc of the outlet side end (122, 142). The heat exchanger fin manufacturing equipment. The radius of curvature of the arc of the inlet side end (121) of the upper blade is the radius of curvature of the arc of the outlet side end (122) of the upper blade, and the radius of curvature of the arc of the inlet side end (141) of the lower blade. The heat exchanger fin manufacturing apparatus according to claim 1, wherein the radius is larger than a radius of curvature of an arc of the outlet side end portion (142) of the lower blade. The slit machining die (100) forms the inter-row slits (30A, 30B) with respect to the metal thin plate (P) by meshing the upper blade (120) with the lower blade (140). Is what
The heat exchanger fin manufacturing apparatus according to claim 1 or 2, wherein the upper blade (120) is capable of changing a position in a vertical direction with respect to the lower blade (140). The heat exchanger fin manufacturing method using the heat exchanger fin manufacturing apparatus as described in any one of Claims 1-3. Heat exchanger manufacturing method Ru with heat exchanger fins produced by the heat exchanger fins method according to claim 4.