JP3115403B2 - Method of manufacturing wave case for transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rectangular or cubic wave case for a transformer having four rectangular side walls formed by corrugating a metal plate. Things.

[0002]

2. Description of the Related Art As a case for accommodating a transformer, a rectangular or cubic wave case using a corrugated heat sink formed by corrugating a metal plate on a side wall is used.

Since the number of wave cases used for a large-capacity transformer is small and it is difficult to automate the manufacture, it is necessary to have a structure that can be easily assembled by hand.

FIGS. 9 and 10 show the structure of a conventional wave case 1 of this type. This wave case is composed of a lower frame 2 having a bottom plate 2a, a rectangular upper frame 3, and a lower frame 2. The frame 5 includes four columns 4 connecting the four corners of the upper frame 3 and the four corners of the upper frame 3, and a rectangular wave-shaped heat sink 6 welded to the frame 5. The corrugated heat radiating plate 6 is formed by corrugating a metal plate so that peaks and valleys appear alternately, then closing both ends of each peak in the width direction by welding, and placing oil inside each peak. The side walls of the case are constituted by the corrugated heat sinks.

[0005] In the case of manufacturing this corrugated case, first, the columns 4 are welded to the four corners of the lower frame 2, then the upper frame 3 is welded to the upper ends of these columns to form the frame 5, and then the frame 5 is formed. The corrugated heatsink 6 is applied to the side surface, and the edge of the heatsink 6 is welded to the frame 5.

[0006]

In the conventional method for manufacturing a corrugated case, if the column 4 has a dimensional error, a bend, a twist, or the like, the lower frame or the upper frame does not mesh well with the column, or the column is not completed. Frame may be distorted. If the frame is distorted, the radiator plate is distorted when welding the corrugated radiator plate 6, so that not only cannot the radiator plate be welded well, but also the completed case is distorted. there were. In particular, when the frame is distorted, stress tends to concentrate on the T-shaped intersection 6a at the base of each ridge of the corrugated heat sink, and there is a possibility that peeling may occur at the weld between the T-shaped intersection and the frame. there were.

When welding the corrugated radiator plate, it is necessary to carefully weld the vicinity of the T-shaped intersection 6a between the base of each peak and the frame, but the corrugated radiator plate 6 is thin. ,
Since the thickness of the frame 5 is large, each wave radiating plate 6 is oriented vertically.
In the state where the beam is radiated, the base 6a of each waveform heat sink and the frame 5 are
Welding requires very high skills and inevitably reduces the efficiency of welding work. Therefore, it is conceivable to perform welding while keeping each corrugated heatsink horizontal, but in this case, it is necessary to change the direction of the frame every time each corrugated heatsink is welded. Inevitably, the work becomes very troublesome.

An object of the present invention is to provide a method of manufacturing a wave case for a transformer, in which welding of a corrugated heat sink can be facilitated to improve manufacturing efficiency and a case without distortion can be easily obtained. It is in.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a rectangular or cubic transformer wave case having four rectangular side walls formed by corrugating a metal plate. It concerns the method.

[0010] In the present invention, four frame plates along the four sides of the corrugated heat sink provided on each side wall are arranged on a horizontal plane, and the butted portions of the four frame plates are welded to form a rectangular shape. After constructing the framework, a step of arranging the corrugated heatsink on the framework and welding the edges of the heatsink to the framework to produce side wall components constituting each side wall,
A step of welding positioning metal fittings for positioning the four side wall components to portions corresponding to the four corner portions located inside the case on the rectangular bottom plate, and adjoining the four side wall portions butt portion of the frame plate adjacent of said first pair of side wall configuration member in two states side wall was positioned a first pair of side wall configuration member constituting respectively brought into contact with the positioning bracket on the bottom plate Performing the temporary welding of the first pair of side walls and the temporary welding of the butted portion between the frame plate and the bottom plate of the first pair of side wall constituent members , and the second pair forming the other two side walls of the four side walls, respectively. Abutting portions of adjacent frame plates of the second pair of side wall components and the frame plates of the side wall component members and the bottom plate in a state in which the side wall component members are positioned in contact with the positioning metal fittings on the bottom plate. Temporary welding of the butted part of the Process and, adjacent side walls already a pair of sidewall components performing the temporary welding of the butted portion of the frame plate adjacent to the first pair of side wall configuration member which is disposed on the bottom plate are provisionally welded A step of performing full welding of the butted portions of the frame members of the component members and the butted portions of the frame plate and the bottom plate of each side wall component member.

[0011]

According to the above-mentioned method, each side wall component is manufactured by performing all welding on a horizontal plane, so that the welding operation of each part can be facilitated and the manufacturing can be performed efficiently.
Also, to weld the corrugated heat sink and the frame on a horizontal plane,
Welding between the T-shaped intersection at the base of each peak of the corrugated heat sink and the framework can be performed well, and it is possible to prevent stress from being concentrated at each T-shaped intersection and causing peeling at the welded portion. .

As described above, the case is assembled by directly welding the side wall components while positioning the side wall components on the bottom plate without assembling the rectangular parallelepiped frame in which distortion may occur. Then, a case without distortion can be easily manufactured. Further, since the welding between the side wall components is performed between the frame plates, the welding can be easily performed even in the vertical posture. Therefore, it is not necessary to change the direction of the case during the assembly, and the efficiency of the assembly work can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, as shown in FIG. 2, four strip-shaped frame plates 10a, 10a 'and 10b, 10b' are respectively arranged on a horizontal plane along four sides of a corrugated heat sink provided on each side wall. Then, the butted portions of the four frame plates are welded to form a rectangular frame set 11. Then
As shown in FIG. 3, by disposing a corrugated heat sink 12 on the framework and welding an edge of the heat sink to the framework 11,
Two types of side wall components constituting the side wall of the rectangular parallelepiped case are manufactured.

The side wall components 13A, 13A shown in FIG.
'Is for forming two opposing side walls on the short side of the four side walls of the rectangular case shown in FIG. In the same manner, the other two side wall components 13B and 13B 'of the long side are manufactured.

The T formed at the base of each peak of the corrugated radiator plate
It is necessary to carefully perform welding of the shape intersection 12a so as not to concentrate stress on the intersection, but in the present invention, it is possible to accurately form the framework by welding the frame plate on a horizontal plane. In addition, since the welding between the corrugated heat sink and the frame is performed in a horizontal posture, the welding at each T-shaped intersection can be easily performed.

When a cubic wave case is manufactured, the dimensions of the side wall components constituting the four side walls are all the same, so that four types of side wall components are manufactured.

As shown in FIGS. 4 (A) and 4 (B), a portion corresponding to four corner portions located inside the case on a rectangular bottom plate 15 to which a base metal 14 is welded to a lower surface is provided. 13A, 13A ', 13B, 13
The positioning fittings 16 for positioning each of B ′ are welded. In the illustrated example, the positioning fitting is formed of an L-shaped angle material.

In the present invention, the order of the step of manufacturing the side wall component 13 and the step of welding the positioning bracket 16 to the bottom plate 15 does not matter.

After the manufacture of each side wall component and the welding of the positioning bracket to the bottom plate, a first pair of side wall components 13A constituting two adjacent side walls of the four side walls, respectively. , pre-welded butt portion between the abutting portion adjacent said first pair of side wall configuration member in a state of being positioned by abutting the positioning member 16 on the bottom plate 15 of the lower end of the 13B and both side walls constituting member and the bottom plate I do. In this case, FIG.
As shown in the figure, the frame plates of the side wall component members are connected to each other in a state in which the tip of the frame plate of the other side wall component member 13B is located at a position １ ／ of the thickness of the frame plate of the one side wall component member 13A. To form a welding groove 17 at the butt portion, and the groove 17 is welded. When the groove is formed and the welding is performed in this manner, since the main welding performed later can be completely performed, the welding of each butted portion can be improved.

Similarly, a second pair of side wall constituting members 13A ', which respectively constitute the other two side wall portions of the four side walls,
In a state where the lower end of 13B ' is positioned by being brought into contact with the positioning bracket 16 on the bottom plate 15, the adjacent butting portions and the side wall forming members of the second pair of side wall forming members 13A' and 13B 'are connected to the bottom plate. While temporarily welding the butted part,
The first pair of side wall components 13 that are already disposed on the bottom plate and are temporarily welded to the side wall components 13A 'and 13B'.
Abutting portions with A and 13B are respectively temporarily welded. FIG. 1 shows a state in which four side wall components are arranged on the bottom plate 15 and temporarily welded.

After the completion of the temporary welding, the inner dimensions of the case are checked, and if necessary, the positions of the side wall components are adjusted. The butted portion with the bottom plate is fully welded to complete the wave case.

In the above embodiment, the outline of the frame 11 of each side wall component is rectangular, but as shown in FIG. 6, the frame plate constituting the frame 11 of the side wall component 13B on the long side is provided. And upper and lower frame plates 10a, 10a 'extending in the lateral direction.
May be made longer so that both ends thereof protrude outside the left and right frame plates 10b, 10b 'extending in the vertical direction. In this case, in particular, the length of the upper frame plate 10a is set to be sufficiently long, and holes 10a1 and 10a1 are provided at both ends in the longitudinal direction of the frame plate 10a.
The holes 10a1, 10a1 at both ends can be used as hanging ears of a case or wire mounting holes for fixing a transformer during truck transportation. FIG. 7 shows a wave case manufactured using the side wall constituent members 13B and 13B ′ of FIG.

In the example of FIG. 6, the lower frame plate 10a '
May have a length that does not protrude from the left and right frame plates 10b, 10b '.

In the above embodiment, a flat band plate having a sectional shape as shown in FIG. 8A is used as the upper frame plate 10a of the side wall constituting member. A pressed steel plate having an L-shaped cross section as shown in (B) (a steel plate bent into an L shape) or an angle material as shown in FIG. Frame plate 10
When a having an L-shaped cross section as shown in FIG. 8B or 8C is used as a, a flange portion for attaching a lid plate to the upper end of the completed wave case can be formed. Installation can be facilitated.

[0025]

As described above, according to the method of the present invention,
Since the welding of the frame plate and the welding of the corrugated radiator plate are all performed on the horizontal plane to produce each side wall component, the side wall component without distortion can be efficiently manufactured. Then, the case is assembled by directly welding the side wall components to each other while positioning the high-precision side wall components by the positioning bracket fixed on the bottom plate, so that a case with high dimensional accuracy and no distortion can be easily manufactured. can do.

Further, in the present invention, since the welding between the side wall constituting members is the welding between the thick frame plates, the temporary welding and the main welding of the side wall constituting members can be easily performed in a vertical posture. Therefore, according to the method of the present invention, it is not necessary to change the direction of the case during the assembling, so that the efficiency of the assembling operation can be improved and the manufacturing cost of the wave case can be reduced.

[Brief description of the drawings]

FIG. 1 is a top view of a wave case obtained according to the present invention.

FIG. 2 is a top view of the framework used in the embodiment of the present invention.

FIG. 3 is a perspective view of a side wall constituting member used in the embodiment of the present invention.

FIGS. 4A and 4B are a top view and a front view of a bottom plate used in an embodiment of the present invention, respectively.

FIG. 5 is an enlarged sectional view of a main part, in which a butt portion between side wall constituting members according to the embodiment of the present invention is enlarged.

FIG. 6 is a front view of a side wall constituting member used in another embodiment of the present invention.

FIG. 7 is a top view of a corrugated case manufactured using the side wall constituent member of FIG. 6;

FIGS. 8A, 8B, and 8C are cross-sectional views showing different examples of the cross-sectional shape of a frame plate that can be used in the present invention.

FIG. 9 is a perspective view showing a frame used in a wave case manufactured by a conventional method.

FIG. 10 is a perspective view of a wave case manufactured by a conventional method.

[Explanation of symbols]

 10a, 10a ', 10b, 10b' Frame plate 11 Frame 12 Wave radiating plate 13A, 13A ', 13B, 13B' Side wall component 14 Base fitting 15 Bottom plate 16 Positioning fitting

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-71609 (JP, A) JP-A-2-246303 (JP, A) JP-A-2-117112 (JP, A) 170701 (JP, U) 2-14207 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 41/00, 27/02 B23K 9/00

Claims (1)

(57) [Claims] 1. A method for manufacturing a rectangular or cubic transformer wave case in which four side walls are provided with a rectangular wave radiating plate formed by corrugating a metal plate. Four frame plates along the four sides of the corrugated heat radiating plate are arranged on a horizontal plane, and the butted portions of the four frame plates are welded to form a rectangular frame. A step of arranging a plate and welding an edge portion of the heat sink to the framework to produce a side wall constituting member constituting each side wall portion; A step of welding positioning brackets for positioning the four side wall components to portions corresponding to the four corner portions, and a first pair of side walls respectively forming two adjacent side wall portions of the four side wall portions Positioning component on bottom plate In a state of being positioned by abutting the abutting portion between the frame plate and the bottom plate of the temporary welding and said first pair of side wall configuration member of the butt portion of the frame plate adjacent of said first pair of side wall configuration member Performing a temporary welding, and positioning the second pair of side wall components constituting the other two side walls of the four side walls by abutting the positioning metal fittings on the bottom plate. Temporary welding of the butting portion between adjacent frame plates of the two pairs of side wall components and the butting portion between the frame plates and the bottom plate of both side wall components, and disposing the second pair of side wall components and the bottom plate already on the bottom plate Frame plates adjacent to each other with the first pair of side wall components that have been temporarily welded
A step of performing temporary welding of the butted portions, and a step of performing full welding of the butted portions of the frame plates of the adjacent side wall component members and the butted portions of the frame plate and the bottom plate of each side wall component member. Method for manufacturing a transformer wave case.