JPS6320615B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a rolled die mold for producing heat exchange fins used in coolers or heaters such as automobile radiators.

Structure of conventional example and its problems Conventionally, this type of heat exchange fin is made by bending a thin plate of aluminum, brass, or other alloy, which is a metal with good heat conduction, into a wave shape, and then applying heat to the part of the bent thin plate that is not the bent part. By making a large number of notches in a direction substantially perpendicular to the edge formed by the bent part, slanting the distance from one notch to the adjacent notch, and arranging a large number of these in parallel. It has a structure in which a large number of inclined pieces are provided in areas other than the bent parts of a thin plate bent in a wavy manner, and in a cooler, these are interposed between flat pipes, etc. to conduct heat from liquid, etc. flowing into the water pipe. Therefore, the heat is transmitted from the water pipes to the heat exchange fins, and by cooling the heat exchange fins with air, the liquid flowing in the water pipes is cooled.

To manufacture this heat exchange fin, the part corresponding to the tooth surface is inclined in the shape of a helical gear, and a tooth-shaped processing blade is provided on this inclined surface. A large number of thin gear-shaped disks that act to tilt the cutting part are arranged and superposed in parallel, so that the whole becomes a gear-like shape with a width as large as that of a strip-shaped thin metal plate. By preparing a pair of roll-shaped dies, rotating them so that they mesh with each other, and feeding the thin plate with good thermal conductivity into the meshing part, the thin plate is bent into a wave shape as shown in Fig. 2. Ru.

At the same time, as shown in Fig. 4, this thin plate forms an inclined piece in the part that does not bend,
As shown in the figure, heat exchange fins that are bent in a wave-like manner and have a large number of inclined pieces arranged in parallel at locations other than the bent portions can be processed at one time.

That is, as shown in FIG. 5, a conventional roll-shaped die for manufacturing heat exchange fins has a die tip 1a for forming waves and a blade 2 for cutting an inclined piece.
and a molded relief part 3 of an inclined piece.
Furthermore, the tip of the die is composed of a tip ridge 1b and a region a where there is no blade 2 for avoiding interference during rotation of the opponent roll. FIG. 7 is a side view of a conventional die, and A shows the area where the blade 2 does not exist up to the tip ridge 1b. Further, a large number of dies 4 are configured to perform processing such as wavy forming, cutting, and inclined piece forming in succession as shown in FIG. 2.

However, in the above-mentioned configuration, as shown in FIG. 3, displacement 8 of the inclined piece 5 due to a special form of machining called rotational machining is unavoidable. That is, with respect to the wavy bending portion 7, in the case of the product feeding direction as shown in FIG.
However, a deviation of 8 occurs. The reason for this is that the tip 11 of the die 4 during rotational machining is
This is due to the slippage between a and the product (not shown).

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention provides a fin that has an inclined piece at the same position with respect to the bending part, has a long inclined piece, and has a high inclined piece ratio, that is, has a high heat exchange efficiency. be.

Structure of the Invention The present invention includes a pair of gear-shaped dies each having a plurality of teeth formed on the outer periphery, and at least two or more sets of dies overlapped in the direction of their rotational axis, and mutually arranged so that the teeth (tooth surfaces) of the dies are in contact with each other. By rotating in the opposite direction, the thin metal plate passing between the dies is formed into a wavy shape so as to have a bent part perpendicular to the passing direction, and a large number of metal plates are formed in the part other than the bent part in a direction substantially perpendicular to the bent part. In a roll-shaped die mold in which notches are made and the spaces between the adjacent notches are inclined,
The tooth portion includes a rounded top portion, a blade portion formed by notching one of the side ridges of inclined portions arranged on the left and right sides of the top portion, and a molded relief portion, and the molded relief portion is so that it is formed up to the top,
One of the side ridge lines is cut out so as to be in contact with the tip ridge line of the top part, and a blade part corresponding to the molding relief part is formed in a valley part of the slope part closer to the rotation axis than the top part. and has an inclined piece at the same position with respect to the bent part of the heat exchange fin,
A fin with a long sloped piece and a high sloped piece ratio can be provided.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 6, this embodiment includes a tip portion 11a, a tip ridge 11b, a blade portion 12a, a molded relief portion 13a of an inclined piece, a tip blade portion 12b, and a tip relief portion 13.
It is composed of b. Also, the die 14 has the blade 1
The range b where there is no 2 is configured to be smaller than the range a of the conventional dice 4. FIG. 8 is a side view of the main die 14, and the length can be compared with range A and range B in FIG. When roll processing is performed using the die 14, the tip blade portion 12b is formed at a position corresponding to the deviation 8 of the inclined piece 5 shown in FIG. 3, and the inclined piece can be cut into a longer length. That is, the ninth
As shown in the figure, the valley edge portion 9 of the opponent roll is also lengthened accordingly.

At this time, in the conventional roll 4, the tip edge portion 12b
Even if it were attached, the valley edge portion 9 of the opposing roll would interfere with the tip portion 1a and would not be able to rotate.

On the other hand, the die 14 of this embodiment can perform rotational processing without interference due to the tip blade portion 12b and the tip relief portion 13b. Further, even if there is a relief part in the tip blade part, the tip ridge can be secured, and the machining of the bending part 7 will not be hindered at all.

Note that the tip blade portion 12b and the tip relief portion 13b of the present invention may be configured not only on one side but on both sides of the tip ridge to ensure a longer inclined piece. It is not possible to secure the inclined piece at a symmetrical position with respect to the bending part 7.

Effects of the Invention As described above, according to the present invention, the inclined pieces are symmetrical,
It is possible to manufacture high-quality heat exchange fins that can be secured for a long time and are efficient.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the heat exchange fin, Figure 2 is an explanatory diagram of the processing principle for manufacturing the heat exchange fin, Figure 3 is a side view of the processed product, Figure 4 is a cross-sectional view of the roll die, and Figure 5. 6 is a partial perspective view showing a roll die according to an embodiment of the present invention, FIG. 7 is a partial side view of the conventional die, and FIG. 8 is a partial perspective view showing a roll die according to an embodiment of the present invention. FIG. 9 is a partial side view of the die in the example, and a partial front view of the roll die showing engagement. 11a...Tip of roll die, 11b...
Tip ridge portion, 12a...blade portion, 12b...tip blade portion, 13a...molding relief portion, 13b...tip forming relief portion.

Claims (1)

[Claims] 1. A pair of gear-shaped dies having a plurality of teeth formed on the outer periphery are overlapped in the direction of their rotational axes, and are rotated in opposite directions so that the tooth surfaces of the teeth are in contact with each other, A thin metal plate that passes between the dies is formed into a wave shape so as to have a bent part perpendicular to the passing direction, and a large number of notches are made in the portions other than the bent part in a direction substantially perpendicular to the bent part, and adjacent In the roll-shaped die mold, which is machined so that the gap between the notches is inclined, the teeth have a rounded top and one side ridge line of the sloped portions arranged on the left and right sides of the top is cut out. one of the side ridge lines is cut out so as to be in contact with the tip ridge line of the top part so that the forming escape part is formed up to the top part; A roll-shaped die mold for manufacturing heat exchange fins, wherein a blade portion corresponding to the molding relief portion is formed in a valley portion on a side closer to the rotation axis than the top portion.