JP2014074562A - Offset fin of heat exchanger and forming method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an offset fin of a heat exchanger capable of assuring a shape of opening part, restricting occurrence of burr and restricting a reduction of plate thickness.SOLUTION: An offset fin 1 of a heat exchanger is made such that a metallic plate M is bent into a rectangular corrugated shape having a crest part 11 and a valley part 12. Adjoining crests along a first direction are connected through apex portions 11a to each other and adjoining valley parts 12 along the first direction are connected through bottom portions 12a. Adjoining crest portions 11 and valley portions 12 are offset along a second direction perpendicular to the first direction. The adjoining apex portions 11a along the first direction in the metallic plate M are partially cut away through slits 1a in the second direction and connected at non-slit portions 1b and the adjoining crest parts 11 are offset in the second direction. The adjoining bottom portions 12a along the first direction are partially cut away through slits 1a in the second direction and connected at non-slit portions 1b and the adjoining bottom parts 12a are offset in the second direction.

Description

  The present invention relates to an offset fin used in a heat exchanger and a method for forming the same.

An offset fin of a heat exchanger and a method for forming the offset fin are used in a heat exchanger such as an oil cooler, and those disclosed in Patent Document 1 are known.
This conventional offset fin bends a metal plate into a rectangular wave shape, and cuts and raises the rising and falling surfaces of each wave in parallel in the wave traveling direction at regular intervals along the ridgeline of these waves. Is offset. The rising position of the rising surface of each wave is different from the cutting position of the falling surface in the longitudinal direction of the ridgeline.

  In order to form the offset fins as described above, the metal strip is continuously bent into a rectangular wave shape by a progressive press or roll, and at the same time, a predetermined distance is set in parallel with the rising surface at regular intervals along the ridgeline of each wave. The rising portion having the length of cut and raised is formed on the offset surface, and the falling portion offset surface having another predetermined length is formed on the rising surface in parallel therewith.

Japanese Patent Laid-Open No. 10-148493

However, the offset fins of the conventional heat exchanger and the molding method thereof have the following problems.
When offset processing is performed on the wave-shaped portion of the wave, the insertion angle of the cutting blade is substantially parallel to the cut surface of the workpiece, and is cut vertically. As a result, it becomes impossible to suppress the surface extrusion on the cut surface, and it becomes impossible to secure the shape of the opening including dimensions and to suppress the occurrence of flash in the entire opening, and it becomes impossible to avoid the deterioration of the product quality. There is.
In addition, because of press molding, there is a problem in that a reduction in plate thickness cannot be avoided when forming a chevron shaped portion.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to provide an offset of a heat exchanger that can secure the shape of the opening and suppress the occurrence of burrs and the reduction of the plate thickness. It is to provide a fin and a method for forming the fin.

For this purpose, the offset fin of the heat exchanger according to the invention according to claim 1 is
The metal plate is bent into a rectangular wave shape and formed into a wave shape having peaks and valleys,
The adjacent peak portions along the first direction of the metal plate are connected to each other at these top portions,
Adjacent valleys along the first direction are connected at their bottoms,
In the offset fin of the heat exchanger in which the adjacent crests and adjacent troughs along the first direction are offset along a second direction perpendicular to the first direction,
While the top part adjacent along the 1st direction of a metal plate is partly cut off by the slit in the 2nd direction, it is connected by the non-slit part, and this adjacent peak part is offset in the 2nd direction,
The adjacent bottom portions along the first direction are partly cut off by slits in the second direction and connected by non-slit portions, and the adjacent bottom portions are offset in the second direction.
It is characterized by that.

The offset fin of the heat exchanger of the invention according to claim 2 is
The offset fin of the heat exchanger according to claim 1,
The first direction is the width direction of the metal plate,
The second direction is the longitudinal direction of the metal plate,
It is characterized by that.

The offset fin of the heat exchanger of the invention according to claim 3 is
The offset fin of claim 1 or claim 2,
The offset fin is an offset inner fin.
It is characterized by that.

Further, the method for forming the offset fin of the heat exchanger of the invention according to claim 4
The metal plate is bent into a rectangular wave shape and formed into a wave shape having peaks and valleys,
The adjacent peak portions along the first direction of the metal plate are connected to each other at these top portions,
Adjacent valleys along the first direction are connected at their bottoms,
In the forming method of the offset fin of the heat exchanger in which the adjacent ridges and the adjacent valleys along the first direction are offset along the second direction perpendicular to the first direction,
A plurality of slits spaced apart by a predetermined distance along the first direction and the second direction of the metal plate are formed,
After the formation of the slit, the adjacent top portions along the first direction of the metal plate are partly cut off by the slit in the second direction and connected by the non-slit portion, and the adjacent peak portion extends in the second direction. As offset
The adjacent bottom portions along the first direction are partially cut off by slits in the second direction and connected by non-slit portions, and the adjacent bottom portions are offset in the second direction.
It is characterized by that.

Further, the method for forming the offset fin of the heat exchanger of the invention according to claim 5 is:
In the heat exchanger offset fin forming method according to claim 4,
The peaks and valleys are formed by press molding.
It is characterized by that.

  In the offset fin of the heat exchanger according to the first aspect of the present invention, the cutting blade for forming the slit can be cut in a state perpendicular to the metal plate which is a non-working member. Occurrence can be suppressed. Moreover, since the metal plate which is a non-processed member can be hold | maintained from both sides at the time of formation of a peak part and a trough part, the reduction | decrease in the plate | board thickness can be suppressed. Moreover, the opening part shape between adjacent offset parts can be ensured by these.

  In the offset fin of the heat exchanger of the present invention according to claim 2, the first direction is the width direction of the metal plate, and the second direction is the longitudinal direction of the metal plate. It becomes possible to arrange the shape in an optimum state according to the shape of the heat exchanger.

  In the method for forming the offset fin of the heat exchanger according to the third aspect of the present invention, since the offset fin is an offset inner fin, it is optimal for a heat exchanger using the inner fin. .

  In the offset fin forming method of the heat exchanger of the present invention according to claim 4, the cutting blade for forming the slit can be cut in a state perpendicular to the metal plate which is a non-working member. Therefore, the occurrence of flash can be suppressed. Moreover, since the metal plate which is a non-processed member can be hold | maintained from both sides at the time of formation of a peak part and a trough part, the reduction | decrease in the plate | board thickness can be suppressed. Moreover, the opening part shape between adjacent offset parts can be ensured by these.

  In the method for forming the offset fin of the heat exchanger according to the fifth aspect of the present invention, since the crest and the trough are formed by press molding, it is possible to perform simple and accurate processing.

It is a perspective view of the offset inner fin of the heat exchanger which concerns on Example 1 of this invention, and is a figure which shows each shape in the case of being formed continuously. It is a side view of the offset inner fin of Example 1. It is a figure which shows the formation process of the offset inner fin of Example 1. FIG.

  Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.

First, the overall configuration of the offset inner fin according to the first embodiment will be described with reference to the accompanying drawings.
The offset inner fin of the first embodiment is used in a heat exchanger, for example, for cooling oil flowing in the heat exchanger.

1 and 2 show the offset inner fin 1.
However, the offset inner fin 1 in FIG. 1 shows the shape of each stage of a metal plate made of aluminum or aluminum alloy that is continuously formed. Zone A in FIG. The zone B represents the shape of each of the state in which the peak portion 10 and the valley portion 11 are formed in the subsequent press working step.
FIG. 2 shows the finished product, and thus a part of the portion corresponding to zone B of FIG.

FIG. 3 shows a molding process of the offset inner fin 1 and a molding apparatus therefor. In the figure, zone C shows the slit forming process, zone D shows the transfer process to the next process of offset inner fin 1, which is the workpiece, and zone E shows the press forming process. .
In order to facilitate understanding, each forming process and the shape of the offset inner fin 1 at that time will be described in order.

First, a metal plate M as a workpiece made of aluminum or an aluminum alloy is prepared and supplied to the molding apparatus 2.
The slit molding unit 2A located upstream of the molding apparatus 2 includes an upper mold 21 and a lower mold 22. The upper die 2A can be lowered toward the lower side 22, and two cutting edges 21a and 22b are provided at the lower end of the upper mold 2A at a position sandwiching the notch 22c in the supply direction of the metal plate M.
That is, the lengths and positions of the cutting blades 21a and 22b are set to the length corresponding to the length of the slit 1a in FIG. 1 and the positions of two adjacent slits 1a, that is, the slits 1a. They are set at positions spaced apart in the longitudinal direction of the metal plate M by a predetermined distance corresponding to the interval.
Note that the length in the longitudinal direction of the notch 22c is the length of the connecting portion 1b between two adjacent slits 1a.

Further, in FIG. 3, only the longitudinal direction, that is, the supply direction of the metal plate M is visible in FIG. 3, but a plurality of cutting edges 21a and 22b are also directed in a direction perpendicular to the longitudinal direction.
Therefore, when the metal plate M is moved in this supply direction and the upper mold 21 is lowered at the slit molding part 2A, the hatched portion of the metal plate M shown in FIG. 3 is cut off, and a plurality of slits 1a are formed simultaneously. Is done. These slits 1a are formed in a state in which a plurality of slits 1a are separated from each other by a predetermined distance in the longitudinal direction of the metal plate M and in the width direction perpendicular thereto, as shown by the zone A in FIG.

  In the slit machining, the cutting blades 21a and 21b cut from the vertical direction into the metal plate M that is a workpiece, so that the occurrence of flash due to the cutting is suppressed.

When the slit 1a is formed, the upper mold 2A is raised.
One of the longitudinal direction and the width direction corresponds to the first direction of the present invention, and the other corresponds to the second direction of the present invention.

As described above, when the slit forming process is completed, the metal plate M is moved to the center position of the press forming zone 2B in the slit forming process as shown in the zone B.
Here, the metal plate M that has finished the slit forming process in the press forming section 2B is formed as follows.
Here, the press-molding portion 2B includes an upper mold 23, an upstream lower half mold 24, and a downstream lower half mold 25.

The upper mold 23 has a convex portion 23a having a shape along the shape of the upper side surface of the valley 12 shown in the zone B of the offset inner fin 1 shown in FIG.
On the other hand, the upstream lower half mold 24 and the downstream lower half mold 25 are movable in the supply direction of the metal plate M so as to approach each other, and the upper right side of the upstream lower half mold 24 in FIG. In the portion, a surface 24a having a shape along the lower surface side shape on the left side of the valley 12 shown in the zone B of the offset inner fin 1 in FIG. 1 is formed, and the downstream lower half mold 25 in FIG. In the upper left portion, a surface 25a having a shape along the shape of the lower surface on the right side of the valley 12 shown in the zone B of the offset inner fin 1 in FIG. 1 is formed.

  In addition, the upper mold 23, the upstream lower half mold 24, and the downstream lower half mold 25 have a plurality of shapes similar to those of the convex portion 23a and the surfaces 24a and 25a. It is provided so as to be alternately offset from the upstream side and the downstream side in the direction.

In the press forming section 2B, the upper die 24 is lowered with respect to the slit-processed metal plate M, and the portion between the slits 1a of the metal plate M is pressed from above to be deformed to be convex downward. To go.
At this time, the upstream lower half mold 24 and the downstream lower half mold 25 move so as to approach each other, thereby forming the shape of the valley 12 with the lower surface of the convex portion sandwiched from both sides. I will do it. By press working while holding both sides, it is possible to increase the forming accuracy of the opening of the slit 1a, the crest 11 and the trough 12.
Of course, at the same time as the above molding, the upper portion of the metal plate M has flat portions 23b on both sides of the convex portion 23a of the upper mold 23 and the upstream lower half mold 24, the upper surface 24b of the downstream lower half mold 25, A mountain part 11 is formed between 25b.

  In these moldings, valleys and peaks are similarly formed in the portion between the other slits 1a in the width direction of the metal plate M, but along the width direction of the metal plate M, the length of the metal plate M is The shape shown in zone B of FIG. 1 is offset by alternately projecting and retreating in the direction.

When valleys and peaks are formed as described above, the upper mold 23 rises, and the longitudinal direction of the metal plate M in the direction in which the upstream lower half mold 24 and the downstream lower half mold 25 are separated from each other. Move to.
In this way, while the metal plate M is sequentially moved in the longitudinal direction of the metal plate M, slit processing and press forming processing are performed to form the offset inner fin 1 having a necessary length.

  Accordingly, the completed offset inner fin 1 has a shape shown in the zone B of FIGS. 2 and 1 (however, only the first row is shown and its downstream side is omitted from the center of the peak). .

  As described above, in the offset fin of the heat exchanger of Example 1 and this molding method, the distance between the top portions 11a of the adjacent peak portions 11 along the width direction of the metal plate M is the longitudinal direction. The slits 1a are partly cut off and connected by a non-slit part 1b, and the adjacent peak parts 11 are offset in the longitudinal direction, and between the bottom parts 12a of the adjacent valley parts 12 along the width direction, Since it is partly cut in the longitudinal direction with the slit 1a and connected with the non-slit portion 1b, the slit processing and then press processing are performed so that the adjacent bottom portion 12a is offset in the longitudinal direction. It becomes possible to cut the cutting blades 21a and 21b from the vertical direction of the metal plate M as a workpiece during slit processing, and the generation of flash (the top portion 11a, the bottom portion 12a and the end portion are most likely to occur, (Occurrence of the entire opening) can do.

  In addition, the upper lower half mold 24 and the downstream lower half mold 25 hold the slit metal plate M of the workpiece from both sides while holding the ridge 11 and the valley on the metal plate M of the workpiece. Since the portion 12 is offset and the slit 1a is opened by pressing, the shape accuracy of the opening and other portions can be increased, and the reduction of the plate pressure is suppressed. be able to.

  As described above, the present invention has been described based on the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and even when there is a design change or the like without departing from the gist of the present invention, it is included in the present invention.

For example, the number and arrangement of the peaks 11 and valleys 12 can be changed.
It is also possible to apply to offset fins other than offset inner fins.

M metal plate
1 Offset inner fin
1a slit
11 Yamabe
11a Top part
12 Tanibe
12a Bottom part
2 Molding equipment
2A slit molding part
2B Press molding part
21 Upper mold
21a, 21b Cutting blade
21c Notch
22 Lower mold
23 Upper mold
23a Convex
23b flat part
24 Upper lower half type
24a side
24b top view
25 Downstream lower half type
25a side
25b Top view

Claims (5)

The metal plate is bent into a rectangular wave shape and formed into a wave shape having peaks and valleys,
The crests adjacent to each other along the first direction of the metal plate are connected at their top portions,
The valleys adjacent along the first direction are connected at their bottom parts,
In the offset fin of the heat exchanger, the adjacent peak and the adjacent valley along the first direction are offset along a second direction perpendicular to the first direction,
The top portions adjacent to each other along the first direction of the metal plate are partially cut off by slits in the second direction and connected by non-slit portions, and the adjacent peak portions are offset in the second direction. As
The adjacent bottom portions along the first direction are partially separated by slits in the second direction and connected by non-slit portions, and the adjacent bottom portions are offset in the second direction. ,
A heat exchanger offset fin characterized by comprising: The offset fin of the heat exchanger according to claim 1,
The first direction is a width direction of the metal plate,
The second direction is a longitudinal direction of the metal plate.
An offset fin for a heat exchanger. In the offset fin of the heat exchanger according to claim 1 or 2,
The offset fin is an offset inner fin;
An offset fin for a heat exchanger. The metal plate is bent into a rectangular wave shape and formed into a wave shape having peaks and valleys,
The crests adjacent to each other along the first direction of the metal plate are connected at their top portions,
The valleys adjacent along the first direction are connected at their bottom parts,
In the method of forming an offset fin of a heat exchanger in which the adjacent peak portions and postponed adjacent valley portions along the first direction are offset along a second direction perpendicular to the first direction,
A plurality of slits spaced apart from each other by a predetermined distance along the first direction and the second direction of the metal plate are formed,
After the formation of the slit, the top portions adjacent to each other along the first direction of the metal plate are partly separated by a slit in the second direction and connected by a non-slit portion, and the adjacent peak portions are Offset in the second direction,
The adjacent bottom portions along the first direction are partially separated by slits in the second direction and connected by non-slit portions, and the adjacent bottom portions are offset in the second direction.
A method for forming an offset fin of a heat exchanger. In the heat exchanger offset fin forming method according to claim 4,
The peaks and valleys are formed by press molding.
A method for forming an offset fin of a heat exchanger.

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