JPS61242731A - Manufacture of corrugated fin with louver - Google Patents

Abstract

PURPOSE:To prevent deformation of fin shape after forming louvers and to improve quality by forming largely tilted louvers by passing a bandlike thin plate through a couple of forming tools and giving the louvers a tilt angle being after manufacturing completion using a couple of shaping rolls. CONSTITUTION:A bandlike thin plate 9 is passed through a couple of forming tools 14a and 14b provided with many edges having a large tilt angle theta1 on the periphery and meshing with each other like gears and is formed into zigzags. Louvers are formed to have the tilt angle theta1 larger than the theta2 being the louver tilt angle being after manufacturing completion of corrugated fins. Next, the zigzag metal plate 16 is supplied between shaping rolls 15a and 15b meshing with each other like gears to press the louvers in the counter direction to the forming direction of the louvers and to make the tilt angle theta1 into the tilt angle theta2 being after manufacturing completion.

Description

[Detailed Description of the Invention] 100,000 Objects of the Invention (Field of Industrial Application) The method for producing a corrugated fin with louvers according to the present invention is used as a radiator for cooling water heat dissipation in an automobile engine, a heater core for heating, etc. It is used to manufacture full-gate fins with louvers that are incorporated into the core of a heat exchanger to improve heat exchange efficiency between air flowing through the core and cooling water.

(Prior Art) For example, as a radiator for cooling water heat dissipation, a large number of flat tubes 3.3 and corrugated fins 4, 4 are alternately installed between an upper tank 1 and a lower tank 2, as shown in FIG. A heat exchanger is used which is provided with a combined core part 5. When such a heat exchanger is used as a radiator, cooling water flows through the many flat tubes 3, 3 from the upper tank 1 to the lower tank 2, and air flows through the core section 5 in the direction of the front and back of the drawing. Heat exchange is performed to lower the temperature of the cooling water.

Corrugated fins 4, 4 sandwiched between each flat tube 3, 3
The system is designed to efficiently exchange heat between the cooling water and the air, and is constructed as shown in Figures 9 to 10. That is, by forming a band-shaped metal plate made of aluminum, copper, brass, etc. in a zigzag pattern, a flat part 4a having louvers 4b, 4b and curved parts 4c, 4d having different curved directions are made to alternately continue. As shown by the arrow a in Fig. 1θ, the air flowing between the flat parts 4&, 4& flows through each louver 4 as shown by the arrow in the same figure.
It flows meandering between b and 4b.

Each corrugated fin 4.4 is formed on each flat tube 3 on the outer peripheral surface of curved parts 4c and 4d formed on both sides of the flat parts 4a and 4a.
．． Since the heat of the cooling water flowing through each flat tube 3.3 is transferred to each full gate fin 4.4, the air flowing between each louver 4b, 4b as described above Heat dissipation from cooling water is performed efficiently.

The molding cutter or molding method for manufacturing the louvered corrugated fin 4 constructed and used in this way is described in, for example, Japanese Utility Model Publication No. 19537/1983, or Japanese Patent Application Laid-open No. 1987-1961.
This is disclosed in Publication No. 28 and the like. That is, conventionally, as shown in FIG. 11, the top portion 6a was made into a curved convex surface, the bottom portion 6b was made into a curved concave surface, and a blade 6C for cutting and raising the louver was formed on the oblique side where the two parts 6a and 6b were connected. As shown in FIG. 13, a large number of blade plates 8 having teeth 6 formed on the outer periphery are stacked to form a pair of gear-shaped shaping blades 7a, 7b, and the reshaping blades 7a, 7b are shown in FIG. The two molding cutters 7a and 7b are assembled so that they mesh with each other, and the belt-shaped metal plate 9 is fed between the remolding cutters 7a and 7b while rotating the remolding cutters 7a and 7b in opposite directions. The teeth 6, 6 on the outer periphery of the plurality of blade plates 8, 8, respectively.

Because they mesh as shown in Figures 13-14.

The band-shaped metal plate 9 fed between the molding cutters 7a and 7b that mesh with each other as described above becomes a fin element 10 with louvers cut and raised on the flat part in a waveform that matches the outer peripheral shape of the teeth 6.6. . The corrugated fin 4 is completed by compressing this fin element 1G in the length direction and narrowing the interval between the flat parts where the louvers are formed.

(Problems to be Solved by the Invention) However, in the above-described conventional method for manufacturing a louvered full cate fin, the following disadvantages occur.

That is, conventionally, the inclination angle with respect to the flat part 4a is 15 to 30.
degree (for aluminum fins) /<4b
, 4b were formed in one motion, so the tooth blade 6C of each forming tooth ring and the louver 4b adhered to each other after forming, and the fin element after forming was attached to one forming cutter 7a (or 7b). If the fin element 1O remains attached to the outer circumferential surface of the molding cutter and is sent to the rear in the rotational direction of the molding cutter, the shape of the fin element 10 may be distorted or the life of the blade 6C may be shortened.

The method of manufacturing a louvered full-gate fin of the present invention solves the above-mentioned disadvantages.

b0 Structure of the Invention (Means for Solving the Problem) The method for manufacturing a louvered corrugated fin of the present invention involves passing a band-shaped metal plate between a pair of forming cutters that mesh with each other like a gear. This metal plate is formed in a zigzag pattern, and a louver is cut and raised on each flat part at an angle of inclination larger than that of the louver of the full gate fin. The louvers formed on each flat part are pressed in a direction opposite to the direction in which the louvers formed on each flat part are cut and raised by the forming cutter, thereby completing the inclination angle of each louver. By matching the inclination angle of the later louver.

a flat portion having a louver cut to a desired inclination angle;
A full-gate fin with louvers is manufactured in which curved portions having alternately different curved directions are successively arranged.

This will be explained in more detail with reference to the drawings. FIG. 1 is a schematic side view of an apparatus for manufacturing a louvered full-gate fin by implementing the manufacturing method of the present invention. The band-shaped metal plate 9 pulled out from the coiler 11 is wound around a tension roll 12 for applying tension, and is wrapped around a pair of upper and lower guide rolls 13.
．． 13, and is sent between a pair of molding cutters 14a, 14b that mesh like gears.

The shape and configuration of this pair of molding cutters 14a and 14b are as follows:
Conventional forming cutters 7a and 7 shown in FIGS. 11 to 14
It is almost the same as b, but the inclination angle of the blade for cutting and raising the louver formed on the outer periphery is 0. (Fig. 2) is about 30 to 45 degrees in the case of aluminum fins, which is larger than the inclination angle θ2 (= about 15 to 30 degrees, see Fig. 5) of the completed louver.

The band-shaped metal plate 9 has a large number of blades having such a large inclination angle θ on its outer circumferential surface, and is shaped as a whole in a zigzag pattern by passing between a pair of molding blades 14a and 14b that mesh with each other. At the same time, as shown in FIG. 4, louvers 4b, 4b having an inclination angle 01 larger than the inclination angle 02 (FIG. 5) of the louver of the completed corrugated fin are formed on each flat portion. Since the inclination angle of the louver is large, each molding cutter 14a, 14b and the louver 4b
, 4b is peeled off from the first stage fin element 16 which has been cut and raised, and the fin element is not sent to the rear in the rotational direction while remaining attached to the outer peripheral surface of any of the molding cutters. .

In this way, each flat portion has a plurality of louvers 4b, 4.
The first stage fin element 16 is cut and raised from b at a large inclination angle.
is then sent between a pair of upper and lower shaping rolls 15a and 15b. The shape and structure of each of the shaping rolls 15a and 15b are similar to the above-mentioned shaping blades 14a and 14b, but since the louvers are not cut and raised, no blades are provided. As shown in FIG. 3, the angle of inclination of the inclined sides of the teeth formed on the outer periphery of the teeth 15a and 15b (the part where the blade 6C is provided with the molding cutter) is the same as that of the louvers 4b and 4b in the completed corrugated fin, as shown in FIG. The angle of inclination is made to match 02. Furthermore, in the illustrated example, the plate pieces 17, 17 constituting each shaping roll 15a, 15b
A gap 18.18 is formed between each louver 4b, 4b by means such as holding a spacer (not shown).
The edges of the plate pieces 17 are prevented from coming into contact with the side surfaces of the adjacent plate pieces 17.

The first stage fin element 16, which has passed between the shaping cutters 14a and 14b to form a louver with a large inclination angle 01 as described above, passes through a pair of shaping rolls 15a as described above,
15b, and adjust the inclination angle of the louver to the inclination angle 02 of the louver of the completed corrugated fin.

These shaping rolls 15a and 15b are simply used to reduce the inclination angle of each louver, and are not necessarily used for the purpose of reducing the inclination angle of each louver.
It is not necessary to construct the structure by overlapping a plurality of plate pieces 17 and 17 as shown in the figure.For example, as shown in FIG. By pressing each louver between the recesses as shown in FIG. 7, the inclination angle of each louver is adjusted to 0 after completion.
It is also possible to match it to 2.

After passing through the shaping rolls 15a and 15b, the second stage fin element 10 is compressed in the length direction to narrow the distance between the flat parts forming louvers, and is completed as a corrugated fin with louvers.

C0 Effects of the Invention Since the method for manufacturing a corrugated fin with louvers according to the present invention is configured as described above, the fin element after cutting out the louvers on the band-shaped metal plate is prevented from adhering to any of the forming tools. Therefore, it is possible to provide a high-quality full-gate fin with louvers at a low cost by preventing the shape of the louvered corrugated fin after completion from being distorted or shortening the life of the forming cutter.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an apparatus for carrying out the manufacturing method of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line A-A in FIG.
Fig. 3 is a sectional view taken along line B-B, Fig. 4 is a schematic sectional view of the first stage fin element, Fig. 5 is a schematic sectional view of the completed corrugated fin with louvers, and Fig. 6 is a schematic sectional view of the shaping roll. Figure 7 is a sectional view similar to Figure 3, Figure 8 is a front view of a radiator incorporating corrugated fins, Figure 9 is a perspective view of corrugated fins with louvers, $10 figure. are the same〈Schematic sectional view, Fig. 11 is a side view showing the teeth of the molding cutter, Fig. 12 is
13 is an enlarged sectional view taken along the line C--C in FIG. 12, and FIG. 14 is a perspective view showing the meshing state of each blade plate. l double tank, 2: lower tank, 3: flat tube, 4 Nicol gate fin, 4a: flat part, 4b: louver, 4C14d
: Curved part, 5: Core part, 6: Teeth. 6a: Top, 6b: Bottom, 6C: Blade, 7a, 7b = Forming cutter, 8: Cutlery plate, 9: Band-shaped metal plate, 10: Fin element, 11: Uncoiler, 12: Tensile roll, 13 Ni guide roll , 14a, 14b: I & shape cutter 15a
, 15b: Shaping roll, 16: Fin element, 17: Plate piece, 18: Gap. 19: Teeth, 20: Four parts. Patent applicant: Japan Radiator Co., Ltd. Representative: Kinzo Koyama (and one other person) 1st rM

Claims (1)

[Claims] A method for manufacturing a corrugated fin with louvers in which a flat part having louvers and a curved part having alternately different curvature directions are alternately continued by forming a strip-shaped metal thin plate in a zigzag pattern, the method comprising: The metal plate is formed into a zigzag shape by passing the plate between a pair of forming cutters that mesh with each other like gears, and each flat part has an inclination angle that is larger than the inclination angle of the louver of the completed corrugated fin. After cutting and raising the louvers, the zigzag-formed metal plate is passed between a pair of shaping rolls that mesh like gears, and the louvers formed on each flat part are cut by the shaping knife. A method for manufacturing a corrugated fin with louvers, in which the inclination angle of each louver is adjusted to the inclination angle of the completed louver by pressing in the opposite direction to the raising direction.