JPH0114344Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a fin forming apparatus for forming corrugated fins having parallel louvers for a heat exchanger.

(b) Background of the Technology As shown in FIG. 1, conventional fin forming equipment for forming fins with parallel louvers consists of a pair of forming rolls 1 at the front stage that mesh with each other, each consisting of a gear-shaped rotary cutter, and a gear-shaped finishing machine. It has a pair of rear forming rolls 2 that mesh with each other (for example, Japanese Patent Publication No. 41-12488), and the fin material 3 is formed by applying it to the rotary blade wheel (forming roll at the front stage) 1 to roughly form the fins. Then, finishing rolls (second stage forming rolls) 2 perform finishing forming to form fins having parallel louvers. That is, the rotary blade wheel 1 is used to cut and raise the parallel louver, and at the same time, the parallel louver is shaped to form an uneven parallel louver, and then the finishing roll 2 is used to make the insufficiently formed portions into the normal dimensions, height, and pitch. It is being corrected. That is, the fins are almost completely formed by the rotary blade wheel 1, and then corrected by the finishing roll 2 to form the fins having parallel louvers.

(c) Prior Art and Problems However, if the fin is almost completely formed by the rotary blade wheel 1, the fin material becomes uneven, causing deformation, distortion, and cracks. After that, the deformation and distortion are corrected to some extent by the finishing roll 2, but it is incomplete and the deformation and distortion remain as usual.
The crack remains. Therefore, in the above-mentioned fin forming apparatus, a high-precision fin molding device having uneven parallel louvers is used.
Moreover, it has been extremely difficult to mold high-quality corrugated fins for heat exchangers.

(d) Purpose of the invention The present invention overcomes the above-mentioned problems, and aims to provide a fin forming apparatus capable of producing high-precision and high-quality corrugated fins for heat exchangers having uneven parallel louvers. This is the purpose.

(E) Structure of the invention The structure of the invention that achieves the above object is that a fin forming device that forms corrugated fins through a pair of front-stage forming rolls that engage the fin material and a pair of rear-stage forming rolls that engage the fin material. A pair of former forming rolls are provided with a large number of parallel helical blades to bend the fin material into a wave shape and cut out louvers with predetermined angles to the fin material, and forming recesses and forming protrusions on the tooth surface. and a pair of subsequent forming rolls that bend each louver inward and outward to make it vertically uneven parallel to the corrugated material surface of the fin material.

(f) Example of implementation of the idea The present invention will be described in detail below with reference to the drawings.

FIG. 3 shows an embodiment of the fin forming apparatus according to the present invention.

In the figure, reference numeral 4 denotes a former forming roll consisting of a pair of gear-shaped rolls that mesh with each other. As shown in the figure, a large number of protruding helical blades 7 for cutting and raising the parallel louvers 6 are provided parallel to the tooth surfaces 8a of the teeth 8. A pair of interlocking rear forming rolls 9
is made of a gear-shaped roll, and has molding recesses 10 and molding protrusions 11 for molding the parallel louver 6 cut and raised as shown in FIG. They are provided alternately on the tooth surfaces 12a of the teeth 12. As shown in FIG. 4, these forming rolls 4 and 9 are supported by rotating shafts 13 and 14, respectively, and are configured to rotate at the same speed by transmitting the rotation of a motor M through a chain 15. Also, in Figure 3, 1
Reference numeral 6 indicates a material roll around which the fin material 17 is wound, 18 indicates a pitch determining unit for determining the pitch of the corrugated fin 5 itself, 19 indicates a counting section, and 20 indicates a cutting section.

When forming a corrugated fin using the above-mentioned fin forming apparatus, the fin material 17 pulled out from the material roll 16 is first passed through a pair of meshing former forming rolls 4, bent into a wave shape, and formed into a large number of helical fins on the tooth surface 8a. A parallel louver 6 is formed on the fin material 17 by the blade 7 as shown in FIG.
to raise up. Since the helical blade 7 has a constant angle with respect to the side surface of the tooth 8, the parallel louver 6 is tilted at a predetermined angle θ with respect to the wavy material surface 17a. Next, the parallel louvers 6 are formed by a pair of interlocking latter-stage forming rolls 9, and the parallel louvers 6 are cut and raised using the recessed forming recesses 10 provided on the tooth surfaces 12a of the teeth 12 and the protruding forming protrusions 11. As shown in FIG. 8, the fin material 17 is bent to form a vertically uneven parallel louver 6 that is parallel or slightly oblique to the corrugated surface 17a of the fin material 17. After that, it is counted by the counting section 19,
The corrugated fin 5 is cut to a predetermined length by the cutting section 20 to form a corrugated fin 5 having uneven parallel louvers 6 that are parallel or somewhat oblique to the wavy surface 5a as shown in FIG.

According to such a fin forming apparatus, the tooth surface 8a of the tooth 8 is bent and formed into a wave shape by the forming roll 4 in which a large number of helical blades 7 are provided in parallel, and the parallel louver 6 is cut and raised. Since the parallel louvers 6 cut and raised by the forming roll 9 with forming recesses 10 and forming protrusions 11 alternately provided on the surface 12a are further molded to form the corrugated fin 5 having the parallel louvers 6, the corrugated fin 5 having the parallel louvers 6 is formed. A corrugated fin 5 having parallel louvers 6 that are parallel or slightly diagonally uneven and free from deformation and distortion, and also free from cracks.
is obtained. In other words, the cutting and raising of the parallel louvers 6 and the uneven forming of the louvers 6 are performed separately, and the fin forming is completely divided into two stages to prevent excessive force from being applied to the fin material, resulting in deformation and distortion. No cracks or cracks will occur. As a result, a corrugated fin 5 with high precision and high quality can be obtained.

In the above embodiment, the rotation of the motor M is controlled by the chain 15.
It is transmitted to the forming rolls 4 and 9 by
Of course, the configuration may be such that the rotation of the motor M is transmitted via a gear.

(g) Effects of the invention As explained above, according to the invention, it is possible to obtain a high-precision and high-quality corrugated fin for a heat exchanger that is free from deformation, distortion, and cracking and has uneven parallel louvers. It will be done.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of a conventional fin forming device.
FIG. 2 is a perspective view showing an example of a corrugated fin molded by the fin molding device according to the present invention, FIG. 3 is a side view of one embodiment of the fin molding device according to the present invention, and FIG. FIG. 5 is an enlarged sectional view of the main part of the forming roll in the former stage of FIG. 3, FIG. 6 is an enlarged sectional view of the main part of the forming roll in the latter stage of FIG. 3, and FIG. An end view of the fin material showing the state formed by the former forming roll in FIG.
FIG. 8 is an end view of the fin material in a state where it has been formed by the forming rolls in the latter stage of FIG. 3. FIG. 4... Preforming roll, 5... Corrugated fin, 5a... Wavy surface, 6... Parallel louver, 7...
...Helical blade, 8, 12...Teeth, 8a, 12a...
... tooth surface, 9 ... subsequent forming roll, 10 ... forming recess, 11 ... forming protrusion, 17 ... fin material,
17a...Material side.

Claims (1)

[Scope of utility model registration request] In a fin forming device that forms corrugated fins through a pair of front-stage forming rolls that engage the fin material and a pair of rear-stage forming rolls that engage the fin material, a large number of helical blades are provided in parallel on the tooth surface to bend the fin material into a wave shape. , a pair of former forming rolls cut out louvers at a predetermined angle with respect to the fin material, forming recesses and protrusions alternately on the tooth surface, bending each louver inward and outward to form the waveform of the fin material. A fin forming device comprising a pair of subsequent forming rolls that are parallel to the surface of the material and are vertically uneven.