JPH08261678A - Corrugated fin and manufacture thereof - Google Patents

Abstract

PURPOSE: To efficiently manufacture various corrugate fins having different fin pitches by forming the angles of both end corners of a flat bent part except specific value in the vicinity. CONSTITUTION: A fin element WS is fed forward by feed rollers 8 each having teeth in a compressing step 10, a frictional resistance is applied by a friction adding part 9, and compressed in a lengthwise direction. Thus, it is bent until the both sides of the flat bent part becomes less than 90 deg. to become a compressed state. Then, it is fed to a pulling step 11, the element WS is held at both ends, and elongated at a predetermined distance in the lengthwise direction. Thus, corrugated fins having various fin pitches can be easily manufactured merely by altering the elongating length of the element molded by the same molding roller, and the work for replacing the molding roller of a molding machine is eliminated, and hence it can be efficiently manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to corrugated fins used in heat exchangers for automobile air conditioners, radiators and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a corrugated fin used in this type of heat exchanger is generally formed with an arcuate bent portion. However, a corrugated fin having an arcuate bent portion is bent on both sides when assembled. The contact area with the flat tube placed in contact with the louver is reduced, the louver cut length of the corrugated fin is short, the air flow between the louvers is reduced, and the heat transfer efficiency is reduced. there were.

[0003]

Therefore, conventionally, a corrugated fin having a flat bent portion formed by bending the bent portion into a flat shape has been proposed in Japanese Patent Laid-Open No. 55-110892.
It has been commercialized.

This type of corrugated fin is formed by rotating a pair of forming rollers each having a tooth tip concave portion and a tooth bottom convex portion at the tooth bottom while rotating them while passing a fin material therebetween.

By the way, when manufacturing heat exchangers of various performances, the fin pitch of the corrugated fins used therefor, that is, the width of the flat bent portion is different, so that FIG.
As shown in (1), it is necessary to manufacture corrugated fins having various fin pitches Pf, that is, flat bent portions FT having various widths.

Therefore, in order to form corrugated fins having various fin pitches, that is, widths of flat bent portions, forming rollers corresponding to various corrugated fins are prepared on the manufacturing line thereof, and those are formed. There is a problem that the corrugated fins cannot be efficiently manufactured due to a setup such as replacement of the molding roller because it is necessary to replace the molding machine for molding.

The present invention has been made in view of the above points, and an object of the present invention is to provide a corrugated fin which can efficiently manufacture various corrugated fins having different fin pitches, and a manufacturing method thereof.

[0008]

In order to achieve the above object, the corrugated fin of the present invention is a corrugated fin having a flat bent portion formed by bending the bent portion into a flat shape.
Angles at both ends of the flat bent portion are other than 90 ° and 90 °
It is characterized in that it is formed in the vicinity.

Further, according to the method of manufacturing a corrugated fin of the present invention, a pair of forming rollers having a tooth tip concave portion and a tooth bottom convex portion on a tooth bottom are meshed with each other and rotated, while passing a fin material therebetween. Then, in the method of manufacturing a corrugated fin for forming a corrugated fin having a flat bent portion, a compression step of compressing a fin element formed by passing through a forming roller in its lengthwise direction, and both ends of the compressed fin element are compressed. A holding step of holding and pulling a predetermined distance in the length direction thereof.

[0010]

In the corrugated fin and the method for manufacturing the corrugated fin having the above-described configuration, the fin element formed by passing through the forming roller is compressed in the length direction in the compression step during the manufacturing step, and the subsequent pulling step is performed. Since the fin element is manufactured by holding both ends of the fin element and pulling the fin element by a predetermined distance in the length direction, the fin pitch Pf of the corrugated fin is determined by the pull length of the fin element stretched in the tensioning step.

Therefore, corrugated fins having various fin pitches can be easily manufactured only by changing the length of the fin elements formed by the same forming roller. Therefore, replacement work for replacing the molding roller of the molding machine becomes unnecessary, and various corrugated fins can be efficiently manufactured.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a process diagram showing a manufacturing process of a corrugated fin. Reference numeral 1 denotes a tension device that draws out the fin material W of a metal thin plate wound in a coil shape and applies tension to adjust the fin crest height, and includes a feed roll 2, a weight roll 3, and a pressing roll 4.

Reference numeral 5 denotes an oil supply portion disposed next to the tension device 1, and drops lubricating oil on the fin material W. 6
Is a forming roller including a pair of toothed rollers arranged next to the oil supply unit 5 and arranged above and below.

The forming roller 6 is provided with tooth tips and tooth bottoms alternately and continuously provided on the outer peripheral portion thereof, and louver cutting blades for forming louvers are helically formed on the hypotenuse between the tooth tips and tooth bottoms. It is formed by cutting and raising.

A cutting machine 7 is arranged next to the forming roller 6 and cuts the fin material W formed by the forming roller 6 into a predetermined length. Next to the cutting machine 7, there is arranged a compression step 10 for compressing the shaped and cut fin element Ws in the longitudinal direction.

In the compression step 10, a feed roller 8 composed of a pair of upper and lower toothed rollers for feeding the fin element Ws forward, and a friction applying portion which is arranged in front of the feed roller 8 and applies frictional resistance to the fin element Ws to be fed. It is composed of 9.

The friction applying portion 9 presses the fin element Ws fed from above with a force of a coil spring or the like, and adds friction resistance to the fin element Ws. The fin element Ws is compressed in its length direction by feeding the fin element Ws forward by the feed roller 8 and applying frictional resistance at the front friction applying portion 9.

After the compression step 10, the tension step 11 is arranged. In the tension step 11, both ends of the fin element Ws compressed in the compression step 10 are held, and the fin element Ws is stretched in the length direction thereof so that a predetermined fin pitch can be obtained.

Next, a method of manufacturing the corrugated fin manufactured by the above manufacturing process will be described.

The fin material W wound in a coil shape (for example, a metal thin plate having a width of 16 mm and a thickness of 0.07 mm) is pulled out from the coil and first sent to the tension device 1.
Tension is applied by passing through the feed roll 2, the weight roll 3, and the pressing roll 4.

After that, the fin material W passes between the pair of rotating forming rollers 6, 6 so that the tips of one forming roller 6 mesh with the bottoms of the other forming roller 6 at the same time. Then, the fin material W is sandwiched between them, and the fin element of the corrugated fin is formed by the meshing of the tooth tip portion and the tooth bottom portion while cutting the louver by the louver cutting blade.

Then, the formed fin element Ws is cut into a predetermined length by the next cutting machine 7, and then the compression step 10 is carried out.

When entering the compression step 10, the fin element Ws is
The fin roller Ws is fed forward by the feed roller 8 having teeth, and frictional resistance is applied by the front friction applying portion 9, whereby the fin element Ws is compressed in its longitudinal direction. By this compression, the fin element Ws is bent to the extent that adjacent louvers come into contact with each other, that is, until both sides of the flat bent portion FT are less than 90 °, and the fin element Ws is in a compressed state.

The fin element Ws compressed in the lengthwise direction is then sent to the tensioning step 11, where the fin element Ws is stretched by a predetermined distance in the lengthwise direction while holding both ends thereof. Thus, a corrugated fin having a predetermined fin pitch is completed.

When the compressed fin element Ws is stretched, in order to obtain a corrugated fin having a predetermined fin pitch Pf, a specific multiple of the fin pitch (for example, 1.4).
It has been found in advance by experiments or the like that the fin element Ws may be stretched by a factor of 2). Therefore, in the pulling step 11,
When the fin element Ws is stretched in the length direction by 1.4 times the fin pitch Pf to be manufactured, and both ends of the fin are separated, the fin element slightly contracts to have the target fin pitch Pf. Corrugated fins are obtained.

Since the corrugated fins having various fin pitches Pf are fins formed by the same forming roller 6 as shown in FIG. 2, they have fin tops having the same width, that is, flat bent portions FT, The angles of both side corners of the flat bent portion FT are increased or decreased before and after 90 °. Of course, both end corners of each flat bent portion FT of the corrugated fin having the same fin pitch Pf have the same angle.

The fin pitch Pf of the corrugated fin to be manufactured is determined by the pulling length of the fin element stretched in the final pulling step 11 as described above, but the angles at both corners of the flat bent portion FT are Flat bent part FT
If the width of the corrugated fin is determined, the range of the fin pitch Pf of the corrugated fin that can be manufactured is substantially determined. Also, the flat bent portion F
The angle at both corners of T is approximately 90 due to the following reasons.
° Limited to the vicinity.

For example, as shown in FIG.
When the width of the flat bent portion FT of the corrugated fin having the flat bent portion of 0 ° is, for example, 1.35 mm and the height is 7.8 mm, the fin pitch Pf becomes 2.7 mm, but the manufacture in this case. As shown in FIG. 4, the minimum pitch of corrugated fins that can be used is to bend the fin element in the contracting direction, that is, to bend both end corners of the flat bent portion to less than 90 ° as long as the louvers L of the adjacent mountain portions do not interfere with each other. The fin pitch is about 2.25 mm.

On the other hand, as shown in FIG. 5, when the fin pitch Pf is increased by extending both end corners of the flat bent portion to 90 ° or more, if the extension is excessively extended, the required heat radiation performance cannot be obtained. Therefore, the maximum pitch of corrugated fins that can be manufactured is that the width of the flat bent portion FT is 1.35 mm, provided that the required heat dissipation performance is obtained.
When the height is 7.8 mm, the maximum fin pitch is about 3.7.
It will be 5 mm. Since the minimum pitch and the maximum pitch of the corrugated fin that can be manufactured also change depending on the height of the mountain, the value of (fin pitch Pf) ÷ (mountain height) is about 0.
The range is from 29 to about 0.48.

As described above, since the fin pitch Pf of the corrugated fins manufactured is determined by the pulling length of the fin element stretched in the final drawing step 11, corrugated fins having various fin pitches can be formed by the same forming roller. It can be easily manufactured only by changing the stretched length of the molded fin element. Further, since the replacement work for replacing the molding roller of the molding machine is unnecessary, various corrugated fins can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram of a corrugated fin showing an embodiment of the present invention.

FIG. 2 is a front view in which corrugated fins of various fin pitches are arranged in order.

FIG. 3 is an enlarged front view of a standard corrugated fin.

FIG. 4 is an enlarged front view of a corrugated fin having a small fin pitch.

FIG. 5 is an enlarged front view of a corrugated fin having a large fin pitch.

FIG. 6 is a front view in which corrugated fins of various conventional fin pitches are arranged in order.

[Explanation of symbols]

 6-Molding roller, 8-Feeding roller, 9-Friction applying section, 10-Compressing step, 11-Tensioning step, FT-Flat bending section.

Claims (2)

[Claims] 1. A corrugated fin having a flat bent portion formed by bending the bent portion into a flat shape, wherein both end corners of the flat bent portion have an angle other than 90 ° and 90 °.
Corrugated fins that are formed in the vicinity. 2. A pair of forming rollers having a tooth tip concave portion at a tooth tip and a tooth bottom convex portion at a tooth bottom are meshed and rotated,
A method of manufacturing a corrugated fin in which corrugated fins having a flat bent portion are formed by passing a fin material therebetween, and a compression step of compressing the fin element formed by passing through the forming roller in its longitudinal direction, and a compression step. And a step of holding both ends of the formed fin element and pulling the fin element by a predetermined distance in the length direction thereof.