JPH02251108A - Manufacture of heat radiating container for oil immersed electric equipment - Google Patents

Abstract

PURPOSE:To improve productivity without restriction on manufacturing steps by providing the steps wherein a strip shaped metal plate is cut before the welding step, and the bending and closing step and the welding step can be independently proceeded and stopped. CONSTITUTION:A strip shaped metal plate is bent in a wave shape, and fin parts 1 are formed. Both ends of each fin part are closed. Thus, many fin parts 1 are formed. Many fin parts 1 are cut out of the strip shaped metal plate 101. Both ends 1b of the fin parts of the cut plates are welded, and an intermediate plate 2 is formed. The compressed intermediate plate 2 and side plates 5a and 5b are welded with a welding torch 8. Thus a bonded plate 15 is obtained. The bonded plate 15 are bent at two places, and first U-shaped bonded plate 16a and a second U-shaped bonded plate 16b are formed. The plates 16a and 16b are butted, and two bonding lines of the butted part are welded. Thus a tubular body is obtained. The strain and the dispersion which are accumulated in said steps are absorbed when the final fubular body is assembled. In this way, the cost of the apparatus is made low, occurrence of strain is prevented and productivity is improved from the overall viewpoint.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a heat dissipation container for oil-filled electrical equipment having a corrugated fin portion from a continuous strip-shaped thin metal plate.

<Prior Art> Conventionally, when manufacturing a heat dissipation container for oil-filled electrical equipment having a corrugated fin portion from a continuous strip-shaped thin metal plate,
Many improvements have been made in areas such as press process accuracy, welding distortion, and labor saving in the manufacturing process, and many applications have been filed.

However, even if partial improvements are made, for example, even if improvements are made to save labor in the manufacturing process, the problem of weld distortion in the finishing process must still be solved.

As an actual manufacturing method, from a continuous strip-shaped thin metal plate,
In order to manufacture the final cylindrical body of the heat dissipation container with the wave-shaped fins, it is necessary to take into account the distortion of the continuous metal strip itself that is actually used, the dispersion of the machined part in the pressing process, the welding distortion, and the distortion of each process. Takt time, supply and exchange of materials, maintenance and inspection of equipment used in each process and replacement of parts, how to absorb the accumulated distortion and variation in each process when assembling into the final cylindrical body, all processes Numerous issues must be comprehensively considered, such as how much the total manufacturing time has actually been shortened.

However, there are no disclosed examples of manufacturing methods that have been comprehensively studied, embodied, and put into practical use for manufacturing a cylindrical body of a heat dissipation container having a final wave-shaped fin portion from a continuous thin metal plate. few.

Below, in order to clarify the improvements in the manufacturing method of the present invention,
A concrete method of manufacturing a cylindrical body of a heat dissipation container having a final wave-shaped fin portion from a conventionally known continuous thin metal plate (for example, Japanese Patent Application Laid-Open No. 53-36629),
The explanation will be as follows with reference to FIG.

A. Form a fin portion 1 by bending a band-shaped metal plate inward and outward at predetermined intervals. B. Fill both ends of the fin portion 1 with a melt layer. C. Cut this into an appropriate length to form a middle plate 2. D. Side plates 5 of the same length are arranged slightly overlapping each other on both sides of this middle plate 20, and E. By holding the middle plate 2 and side plates 5 with holding rollers 6.6, they can be transported simultaneously in the vertical direction. The overlapping part is welded using the fixed welding devices 8 and 8, F. The welded both sides of the plates are then straightened using straightening rollers 7. A rectangular cylindrical body is formed by bending the cylindrical part outward in three places and welding both ends, and a bottom plate is welded to the flange part on one side of the formed cylindrical body to manufacture a heat dissipation container for oil-filled electrical equipment. It's a method.

<Problems to be solved by the invention> Since the problems to be solved by the invention are also the problems of the prior art, the problems of the prior art are as follows.

(1) In the steps in the order described in items A to 0 of the prior art described above, the fin portion forming step and the welding and closing step at both ends of the fin portion are performed in the state of one continuous band-shaped metal plate before cutting. Therefore, there is a problem in that the manufacturing process is limited and productivity cannot be improved.

One of the limitations imposed by the manufacturing process is that the moving speed of the metal plate corresponding to the bending speed in the process of supplying and bending the strip metal plate, and the moving speed of the metal plate corresponding to the welding speed in the welding and closing process. That's different.

Other limitations are the number and duration of interruptions to replace metal plates and molds of a predetermined width to be supplied to the supply bending process due to differences in specifications of heat dissipation containers, consumption of welding wire in the welding and closing process, and electrode The difference is the interruption time for nozzle wear replacement, spatter removal work, etc.

In this way, the moving speed and interruption time of the metal plate in the feeding/bending process are different from the moving speed and interruption time of the metal plate in the welding and closing process, and unlike the prior art, these two processes are If the metal plate is continuous, the movement speed of the metal plate will be limited by one of the slow processing processes,
Moreover, if one of the processes is interrupted, the other process must also be interrupted, so there is a problem that productivity cannot be improved.

Another problem is that the strip-shaped metal plate is supplied by unwinding a continuous steel strip wound into a cylindrical shape, but the unwound copper strip is not in a straight line but at a certain interval (3 to 3 5m
), causing undulations (waves) to the left and right. Therefore, when attempting to perform the bending process and the welding and closing process on one continuous metal plate as in the conventional technology, the metal plate is affected by undulations corresponding to the length of the metal plate between the two processes. , we believe that it is difficult to adopt this method because the variation in the welding and closing process is large and welding defects are likely to occur.

Furthermore, since the above-mentioned prior art does not disclose any special technology, it is usually possible to: ■ bend into a wave shape to form a heat dissipation fin, or ■ (if both ends of the fin are not closed, both ends will be open and welding will not be possible. Since this is not possible, the following steps are considered to be:) closing both ends of the fin portion, and (2) welding both ends of the closed fin portion. In this case, (1) bending equipment, (2) closing equipment, and (3) welding equipment are arranged in series, and the fin portion is considered to move little by little between these three equipments. In this case, if you try to block both ends of the fin part in (■) in a narrow range to the root of each fin part,
Also in the closing step (2), it is necessary to place a middle mold inside each fin portion. However, if the fin part is moved from the bending equipment (■) to the closing equipment (■), the equipment will be complicated and its durability will be shortened because the middle mold is also moved, or the equipment If you try to insert the type again,
Extra equipment and extra processing time may be required.

(2) In the steps described in sections D and E of the prior art described above, in order to weld the middle plate 2 and the side plates 5, a means for fixing the middle plate 2 and the side plates 5 so that they do not shift is required. . In item E of the prior art, it appears that the holding roller 6.6 is used to hold the holding roller 6.6 to prevent it from shifting.

However, even when trying to implement the prior art in Section E, the side plates 5 and middle plate 2 cannot be restrained even if the side plates 5 and middle plate 2 can be placed on the holding rollers 6.6. , it is considered that it is not possible to reduce distortion during welding.

The reason for this is that the middle plate 2 is formed with the fin portion 1 whose sheet metal body is corrugated, so that the holding rollers 6.6 (as shown in FIG. It cannot be held (restricted) by the upper holding roller of the upper and lower rollers. That is, since the middle plate 2 has the fin part 1 formed up to the end, the fin part 1 becomes an obstacle, and the upper holding roller 6 cannot restrain the middle plate 2. Only the upper and lower retaining rollers 6 are used to restrain the upper and lower retaining rollers 6. That is, no means for preventing the middle plate 2 and the side plates 5 from being displaced is disclosed. Furthermore, it is not disclosed at all why the distortion during welding is reduced when only the side plate 5 is restrained by the holding rollers 6.6.

Therefore, the prior art disclosure alone does not allow the holding roller 6.
6, there is a problem that not only cannot the middle plate 2 and the side plate 5 be restrained so that they do not shift, but also that distortion cannot be reduced.

(3) The prior art mentioned in section F is concerned with: ■ What kind of distortion occurs in the process of section E? ■ How does the correction roller 7.7 in the process of section F cause distortion due to the function? There is a problem as to whether the distortion can be corrected (in particular, since the correction roller 7.7, like the holding roller 6.6, can only press only the side plate 5), can the distortion really be corrected?

(4) In the prior art described in item G above, when trying to weld both ends of a cylindrical shape, the flanges at the ends of both ends become uneven due to variations in bending accuracy and welding deformation. Since there is a flange, it is extremely difficult to correct the problem, and the gasket that seals the tank cannot be properly sealed.

Furthermore, in the prior art described in Section G, a long joint plate consisting of a middle plate and a side plate with a long overall circumference forming a cylindrical body is bent at three points to form a rectangular shape. , first of all
The first is that the bending equipment is large and expensive, and the second is that after bending the entire circumference in three places, if you try to make it easier to transport the rectangular cylindrical body from the equipment, both ends will open. There is also the problem that a correction process is required to match the values, resulting in poor workability.

Furthermore, in the prior art of the G term, as mentioned above,
Normally, a strip-shaped metal plate is supplied by unwinding a continuous steel strip wound into a cylindrical shape, but the unwound copper strip is not in a straight state but undulates from side to side at certain intervals (3 to 5 m). is occurring.

Therefore, when trying to form a cylindrical shape using one sheet as in the process in Section G, the length of the band-shaped metal sheet becomes long, and it is affected by the above-mentioned undulations, making it difficult to obtain accuracy in the intermediate processing steps. The problem is that it is difficult to

Means for Solving the Problems> The method for manufacturing a heat dissipation container of the present invention is constituted by the means described in the claims in order to solve the problems of the above-mentioned prior art. The main points will be explained by omitting the description.

(1) In place of steps A to C of the prior art, the present invention
By cutting the band-shaped metal plate after the bending and closing step, that is, before the welding step, the bending and closing step and the welding step can proceed and stop independently.

Furthermore, in the manufacturing method of the present invention, the radiation fin portion is formed by bending the inner mold and the outer mold into a wave shape, and both ends of the fin portion are closed at the end of the bending process. Bending and closing both ends of the fin portion are performed simultaneously.

(2) The present invention provides, instead of the D and E of the prior art,
The process was as follows.

■In order to prevent the middle plate 2 and the side plate 5 from shifting, temporarily attach the middle plate 2 and the side plate 5 at two or more places including near both ends (=1) of one side plate, and at least four places in total on both side plates. Weld and fix.

■In order to prevent the middle plate 2 and side plate 5 from lifting up due to distortion during welding, the middle plate and side plates are stopped during welding, and pressure is applied to the upper surface near both sides of the middle plate.

(1) After pressurizing the middle plate 2, the welding device is moved to weld the middle plate 2 and the side plate 5 while the middle plate and the side plates are stopped (the object to be welded is fixed).

(3) The present invention is not based on the concept of correcting the generated distortion with a correction roller as in the prior art section F, but instead uses tack welding and pressurization of the intermediate plate as explained in section 0 above to correct the distortion. The occurrence of (deformation) is reduced in advance.

(4) The present invention has a long overall length like the G term of the prior art.
Instead of forming a rectangular cylindrical body by bending the joint plate in which the two fin portions and the middle plate were joined at three places and welding both ends, the following process was performed.

A first U-shaped joint plate 16 is formed by bending the fin portion of the first joint plate 15a, in which the 0742 part and the middle plate are joined together, at two places.
form a.

■In the same way, attach the second joining plate 15b with the fin part outside.
A second U-shaped joining plate 16b is formed by bending at some places.

■The upper surface 10a of the end of the flange portion 10 on the gasket attachment side of the first U-shaped joint plate 16a, and the upper surface 10b of the end of the flange portion 10 on the gasket attachment side of the second U-shaped joint plate 16b. However, make sure that they are not at different levels (so that the ends of the flanges on the side where the gasket is installed on the side plywood are aligned),
The two U-shaped joint plates are butted against each other and temporarily assembled into a cylindrical body, and the two U-shaped joint plates are temporarily welded and fixed.

(2) Weld the two joining six wires 16c and 16d formed by temporarily assembling the two U-shaped joining plates 16a and 16b.

<Example> Hereinafter, an example of each step of the method for manufacturing a heat dissipation container of the present invention will be described with reference to FIGS. 1 to 9.

(1) First step (Fig. 1) As shown in Fig. 1 (A), the first step is to unwind a thin copper band wound into a cylindrical shape, and then unwrap a band-shaped metal plate 101 at a predetermined interval P. The fin portion 1 is bent into a waveform at a predetermined height H to form a fin portion 1 having a predetermined number N of ridges, and as shown in the enlarged view of FIG. 1(B), both ends 1b and lb of the fin portion 1 are By using an inner mold for wave-shaped bending and an outer mold (not shown) to close both ends of the fin part at the end of the bending process, the wave-shaped bending process and the closing process of both ends of the fin part can be performed. This is a bending and closing process that is performed at the same time.

The length of the wavy bent fin portion shown in FIG.
This is the length necessary to form the . A predetermined interval P between these many wave shapes.

Two cutting plates 102 having a height H and a number N of ridges are formed, and a cylindrical body is formed by a pair of U-shaped joining plates having the same wave shape.

Further, one of the first cutting plates 102a of the pair of U-shaped joining plates is made into a wave shape as shown in FIG. Diagram (C)
The length of the flat plate part at both ends without bending as shown in is PO
Then, the wave-shaped parts on both sides following that have a height H1 interval P1
The central wavy portion is formed by a fin portion with a height of H2 and the number of ridges is N2, and a cylindrical body is formed by a pair of bonded plates with different wave shapes. I can do it.

(2) Second process (Fig. 2) As shown in Fig. 2, the second process is to move a large number of fin parts 1 with both ends 1b of the fin parts closed in the first process to a predetermined length in the undulating direction of the fin parts. Cut it into the first cutting plate 10'2a.
(or the second cutting plate 102b).

(3) Third step (FIG. 3) As shown in FIG. 3, the third step is to cut the first cutting plate 102a (or second cutting plate 102b) formed in the second step.
Weld both ends 1b and lb of the fin portion of the first intermediate plate 2a.
(or the second intermediate plate 2b) is a welding process.

In the first to third steps of the manufacturing method of the present invention, the belt-shaped metal plate is cut before welding, and the bending and closing step and the welding step are made independent, so that the processing speed is faster than the processing speed of the welding step. The intermediate plates 2 that have been folded and closed in the fast bending and closing process are gradually accumulated. The welding process for the accumulated intermediate plates 2 continues even when the bending and closing process is interrupted for a long time to replace the metal strip and the mold.

Therefore, in the first to third steps of the manufacturing method of the present invention, even when the bending and closing step is interrupted for a long time, the welding process, which has a slow processing speed, is not interrupted, thereby improving productivity. be able to.

Additionally, these processes help improve productivity for low-volume, high-mix products, especially for products that require frequent changes in metal strips and molds. Conversely, even when it is necessary to frequently replace consumable parts of welding equipment or remove spatter, this can be done without interrupting the bending and closing process, and with only a short interruption of the welding process. .

Furthermore, these processes are less affected by the waviness of the rewound metal strip, improving the accuracy of the welding process and preventing the occurrence of welding defects.

(4) Fourth step (Fig. 4) Fig. 4 (A) shows the first intermediate plate 2a (
or second middle plate 2b) side plates 5 a + of approximately the same length on both sides;
5 Middle board 2 with 'b facing down, slightly overlapping each other.
and side plates 5a and 5b. The fourth step is shown in Figure 4 (B).
As shown in , this is the process of arranging the middle plate 2 on both sides with the side plates 5a and 5b facing down, slightly overlapping each other.

(5) Fifth step (FIG. 5) As shown in FIG. 5, the fifth step consists of the first middle plate 2a (or second middle plate 2b) and side plate 5a which are arranged one on top of the other in the fourth step.
, 5b is tack-welded at two locations near both ends of one side, and at a total of four locations on both sides. When performing this tack welding, if a gap occurs between the middle plate 2 and the side plate 5, as shown in the next 6th step, apply the tack welding area from above the middle plate 2. Press down to eliminate any gaps.

In addition, if the length of the middle plate 2 and side plate 5 is large and a gap is created during welding in the next 6th step, the tack welding point should be placed in the middle of the two places other than the two near both ends of one side of the side plate. One or more locations may be added to the section.

(6) Sixth process (Figure 6) Figure 5 (A) shows the first intermediate plate 2 tack welded in the fifth process.
The figure shows a state in which the upper surface near both sides of the first intermediate plate 2 is pressurized with the a (or the second intermediate plate 2b) and the side plates 5a and 5b stopped. This pressurization may be performed by a pressure mechanism such as an air cylinder, or by placing a weight. Moreover, when the weight of the middle plate 2 is large, pressure can be applied by the weight of the middle plate 2, especially without using a pressure mechanism or weight.

Furthermore, the areas to be pressurized are 4 including both ends of both sides of the middle plate 2.
It is desirable to apply pressure at one or six locations, but if both sides of the middle plate can be pressurized, pressure may be applied from one location in the center.

When pressurizing a corrugated middle plate as shown in Fig. 1 (C) mentioned above, the height of the crest is 6 at both ends, 4 at each end, and 2 at both sides at the center of the ridge at height H2. It is desirable to apply pressure at certain points.

In the sixth step, as shown in FIG. 6(B), the pressurized first
The middle plate 2a (or the second middle plate 2b) and the side plates 5a, 5b are welded together by moving the welding tip 88 of the welding device to weld the first middle plate 2a (or the second middle plate 2b). and the side plates 5a and 5b, the first joint plate 15a (or second joint plate 15b)
This is the side plate welding process for manufacturing.

(7) Seventh step (FIG. 7) As shown in FIG. 7, in the seventh step, the first bonding plate 15a (or second bonding plate 15b) produced in the sixth process is
Bend at two places so that the fin portion 1 is on the outside, and then attach the first U-shaped joint plate 16a (or the second U-shaped joint plate 1 [!
b) is a U-shaped bending process for manufacturing.

(8) Repeating process The above-mentioned first to seventh steps are repeated to manufacture the second cutting plate 102b, second intermediate plate 2b, second joint plate 15b, and second U-shaped joint plate 16b in this order. do. first, first
The first U-shaped joint plate 16 manufactured through the seventh step to the seventh step. a
Then, the second U-shaped joint plate 16b manufactured through this repeated process is combined to form a cylindrical body for one heat dissipation container.

First U-shaped joint plate 16a and second U-shaped joint plate 1
When the wave shape and external dimensions of B and b are the same, 1. The previously produced U-shaped joining plate 16 and the later produced U-shaped joining plate can be arbitrarily combined to form a cylindrical body.

However, as explained in the first step, the first cutting plate 102a having a wavy fin portion as shown in FIG.
and a second cutting plate 102b having a wavy fin portion as shown in FIG. When manufacturing and forming a cylindrical body, the following repeating process can be adopted.

■In the first and second steps 1. First cutting plate 10', '2
The cutting plates a and the second cutting plates 102b are manufactured alternately, and the first to seventh steps and their repeating steps are performed alternately on the same line.

■Similarly to the above, the first cutting plate 102a and the second cutting plate 102b are manufactured alternately in the first and second steps, but all or part of the third to seventh steps are The first line performs all or part of the repeating steps from the third step to the seventh step in the second line. Steps not included in some of the above are performed in a common step.

■The first U-shaped joint plates 16a for a plurality of units are manufactured at once through the first to seventh steps, and then the second U-shaped joint plates 16a for the same number of units are manufactured by repeating these steps. The letter-shaped joining plates 16b are manufactured all at once. This manufacturing method reduces the number of program changes in each process when the shape of the first U-shaped joint plate 16a and the shape 4 of the second U-shaped joint plate 1.6b are significantly different. I can do it.

(7.) Eighth process (Figure 8) Figure 8 (A) shows the first U-shaped joint plate 16a manufactured in the seventh process and the second U-shaped joint plate 16b manufactured in the repeated process. Shows the state immediately before matching.

When these two U-shaped joint plates are butted together, as shown in FIG. 8(B), the first U-shaped joint plate 1
Upper surface 1 of the end of the flange portion 10 on the side where the gasket is attached in 6a
0a and the same upper surface 10 of the second U-shaped joint plate 16b.
Butt the two U-shaped joining plates together so that they are not at the same level as b.

In the eighth step, as shown in FIG. 8(C), the first and second U-shaped joining plates 16a and 16b are butted against each other and temporarily assembled so that the respective flange portions mentioned above are not at different levels. Temporary attachment is a cylindrical body assembly process in which a cylindrical body is produced by welding and fixing two U-shaped joining plates.

(8) Ninth process (Fig. 9) As shown in Fig. 9, the 9th process is the temporary assembly and tacking of the two joining lines (welding lines) of the welded cylindrical body in the 8th process. 1
This is a cylindrical body welding process in which 6c and 16d are welded.

(9) 10th process At the flange part which becomes the bottom of the cylindrical body welded in the 9th process,
A heat dissipation container for oil-filled electrical equipment is manufactured by welding a bottom plate (not shown).

<Effects of the Invention> (1) In the first step of the manufacturing method of the present invention, the heat dissipating fin portion is formed by bending the inner mold and the outer mold into a wave shape, and at the end of the bending step, both ends of the fin portion are bent. By closing the fins, the wave-shaped bending process and the closing process on both ends of the fin part can be performed at the same time, so it is not necessary to move the middle mold along with the movement of the fin part from the bending equipment to the closing equipment. This simplifies the equipment, does not impair durability, and can save extra equipment and processing time.

(2) In the first to third steps of the manufacturing method of the present invention,
Adopting a process in which the bending and closing process and the welding process can proceed and stop independently by cutting the band-shaped metal plate after the bending and closing process, that is, before the welding process. By changing the processing speed and interruption of the bending and closing process and the processing speed and interruption of the process subsequent to the welding process, it is possible to prevent both of these processes from becoming slow or interrupted. Therefore, productivity improves.

Furthermore, in the above process, the influence of waviness of the continuous steel strip unwound from the cylindrical shape is reduced, so variations in the welding process are reduced, and the occurrence of welding defects can be eliminated.

(3) In the sixth step of the manufacturing method of the present invention, the intermediate plate 2 and the side plates 5 are temporarily attached by welding, so that the intermediate plate 2 and the side plates 5 do not become misaligned.

In addition, since the middle plate 2 is pressurized, it is possible to prevent the middle plate and the side plate from lifting up or creating a gap due to the heat effect during welding, thereby eliminating the occurrence of welding defects.
Since the occurrence of distortion (deformation) is prevented, the work of correcting distortion (deformation) can be omitted, and productivity can be improved.

Furthermore, since pressure is applied while the objects to be welded, which are the middle plate 2 and the side plates 5, are stopped, the pressurizing means is simple, the pressurizing is reliable, and the occurrence of distortion can be reduced.

Furthermore, since welding is carried out by moving the welding torch 8 of the welding device, the welding torch is smaller and lighter than the object to be welded. Distance control from the torch tip (arc length control,
Weld line copying (4) In the seventh step of the manufacturing method of the present invention,
Since the joint plate 15 is bent in two places to produce a U-shaped joint plate, it is possible to reduce the need for large and expensive equipment. This eliminates the need to transport the equipment, improving productivity.

(5) In the eighth step of the manufacturing method of the present invention, the gap between the 0a and the second U-shaped joint plate 16b? Kintorii” side 1
0b can be butted against each other without being at different levels, so it is possible to omit the extremely difficult straightening process of the flange portion, and productivity is improved. In addition, since the cylindrical body of one heat dissipation container is formed by butting two U-shaped joint plates together, it is easier to manufacture than the manufacturing method in which one joint plate is bent in three places to form a cylindrical body. It is possible to prevent the influence of the undulation of the strip-shaped thin metal plate 101 and the occurrence of a large level difference in the abutting portion due to variations in accuracy due to bending at three locations.

(6) Above, the effects of the manufacturing method of the present invention have been described for each process, but each process of the manufacturing method of the present invention is related to each other, and from a comprehensive perspective, it is possible to reduce the cost of equipment and reduce the occurrence of distortion. It is excellent in prevention and productivity improvement, and has great practical value.

[Brief explanation of drawings]

FIG. 1 to FIG. 9 are diagrams showing manufactured products in each step of the method for manufacturing a heat dissipation container of the present invention. FIG. 1(A) is a diagram showing a large number of fin parts 1 formed by bending a band-shaped metal plate into a wave shape and closing both ends of the fin parts. FIG. 3C is an enlarged view of a portion where both ends of the fin portion are closed; FIG. FIG. 2 shows how a large number of fin parts 1 formed in FIG.
FIG. 3 is a diagram showing the cutting plate 102 cut from 01, FIG. 3 is a diagram showing the intermediate plate 2 manufactured by welding both ends 1b of the fin portion of the cutting plate 102 formed in FIG. 2, and FIG. , the middle plate 2 manufactured as shown in Fig. 3 and the side plates 5a welded to both sides thereof;
5b is a diagram showing the middle plate 2a and the side plates 5a and 5b arranged slightly overlapping each other under the middle plate 2a, and FIG. middle plate 2 and side plates 5a, 5
Figure 6(A) shows the middle plate 2 and side plates 5a and 5b, which have been tack welded and pressurized from above. The figure (B) shows
FIG. 7 is a diagram showing the joint plate 15 in which the pressurized middle plate 2 and side plates 5a, 5b are being welded by the welding torch 8, and FIG.
FIG. 8(A) is a diagram showing a U-shaped joint plate 16 formed by bending the joint plate 15 manufactured in step B) at two places, and FIG. 8(A) shows the first U-shaped joint plate 16a manufactured in FIG. 8(B) is a diagram showing the two-liquid plywood before butting the first U-shaped joint plate 16a and the second U-shaped joint plate 16b. FIG.
FIG. 8(C) is an enlarged view of the upper surface 10a of the gasket mounting flange of the second U-shaped joint plate 16b and the upper surface 10b of the gasket mounting flange of the second U-shaped joint plate 16b, just before they are butted together so as not to be at different levels. Figure 9 is a diagram showing the cylindrical body in which the first and second U-shaped joint plates are temporarily assembled, and Figure 8 (C)
FIG. 10 is a diagram showing a cylindrical body obtained by welding the two joining lines 16c and 16d of the cylindrical body temporarily assembled in , and FIG. 10 is a diagram illustrating a part of the process of a conventional method for manufacturing a heat dissipation container. 101... Band-shaped metal plate, 1... Wave-shaped fin portion, 1
02.102a, 102b--cutting plate, 1 b...
・Both ends of the fin part, 2.2a, 2b--middle plate, 5.5
a.

Claims (1)

[Scope of Claims] A first step of bending a band-shaped metal plate 101 into a wave shape at a predetermined interval P to form a large number of fin parts 1, and closing both ends of the fin part 1; The fin portion 1 that has been closed is cut into a predetermined length in the width direction of the band-shaped metal plate 101 to form a first cutting plate 1.
02a and both ends 1 of the fin portion 1.
a third step of manufacturing the first intermediate plate 2a by welding the intermediate plates 2a; a fourth step of arranging the intermediate plates 2a on both sides of the intermediate plate 2a, with side plates 5 of approximately the same length facing down, slightly overlapping each other; and a fifth step of temporarily welding the middle plate 2a and the side plate 5, and with the middle plate 2a and the side plate 5 stopped, applying pressure to the upper surface near both sides of the middle plate 2 and moving the welding torch 8. a sixth step of welding the middle plate 2a and the side plate 5 to produce a first joint plate 15a; and a sixth step of bending the first joint plate 15a at two places so that the fins are on the outside. A seventh step of manufacturing the first U-shaped joining plate 16a, and repeating the first to seventh steps to produce the second cutting plate 10.
A second U-shaped joint plate 16b is manufactured from 2b to form a cylindrical body for one heat dissipation container when paired with the first U-shaped joint plate 16a. the packing mounting surface 10a of the first U-shaped joint plate 16a, and the second U-shaped joint plate 16b.
so that the level is not different from the packing mounting surface 10b.
An eighth step of manufacturing a cylindrical body by temporarily assembling two U-shaped joining plates 16a and 16b against each other, and two joining lines 16c and 16d of the temporarily assembled cylindrical body in the eighth step. A method for manufacturing a heat dissipation container for oil-filled electrical equipment, comprising: a ninth step of welding the cylindrical body, and a tenth step of welding a bottom plate to the flange portion, which becomes the bottom surface of the cylindrical body welded in the ninth step.