JPS5931432B2 - Automatic welding method of corrugated heat sink and edge plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of welding a corrugated heat sink and an edge plate, and more particularly to a method of welding a corrugated heat sink formed from a thin plate and an edge plate connected thereto.

A corrugated heat sink, such as the one shown in FIG. 1, is used in liquid-filled tanks that have heat sink fins, such as in the case of a transformer. In the example shown in FIG. 1, a thin metal plate 1 with a thickness of about 1 mm is bent into a waveform at intervals A to form a bent portion 2, and both ends 2a and 2b of the bent portion 2 are formed by leaving a central portion 3. It is crushed, then welded and used as a side plate for a liquid tank.

If a corrugated heat sink as described above is used, the overall rigidity of the side plate of the tank is insufficient, so normally, as shown in Figure 2, thick plates of about 3 mm are installed on both sides of the corrugated heat sink. , 5 are welded to increase the overall rigidity.

One of the edge plates 4 is actually located above, and a lid (not shown) is attached to the curved portion 4A.

Further, the outer edge of the other edge plate 5 is bent at a right angle to form a bent portion 5A, and a bottom plate (not shown) is welded to this bent portion 5A. Note that the outer edges of the edge plates 4 and 5 may be bent toward the bent portion 2 side. By the way, when the structure as shown in FIG.
Both ends 2a and 2b are formed by bending a thin plate, so
A substantially triangular space 6 may be created, or a difference C may occur between the end faces of the bottom plate T between adjacent wavy portions during molding.

Furthermore, the entire corrugated heat sink 1 is twisted or warped due to internal residual stress during molding, so it has been impossible to automatically weld it using an automatic welding machine. Therefore, actual welding has to depend on the manual work of welding engineers with advanced welding skills, making it difficult to ensure stable welding quality and having relatively low productivity. The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and its purpose is to automatically weld a corrugated heat sink and an edge plate so that the corrugated heat sink and edge plate can be automatically welded together. To provide a welding method. In order to achieve the above purpose, the upper end of the bent part of the corrugated heat sink is pressed with a flexible pressing body, and the weld line is traced by a copying sensor that moves along the welding line. It is characterized in that the welding torch is moved in conjunction to automatically weld the corrugated heat sink and the edge plate.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 3 explains one embodiment of the present invention. In the figure, reference numeral 8 denotes a traveling trolley, which is run on rails 10 via wheels 9.

This rail 10 is laid almost parallel to the welding line,
Arrow D in the figure indicates the direction of progress of welding. Traveling trolley 8
A horizontal slider 11 is provided above, and a vertical slider 12 is attached to this horizontal slider 11, and the sliding amount of these two sliders 11 and 12 is controlled by a control device 13. controlled.

One end of a holder 14 is fixed to the vertical slider 12, the other end of the holder 14 is bifurcated, and a welding torch 16 is fixed to the tip of one arm 15.
A detector 18 is fixed to the tip of the other arm 17.

A scanning sensor 19 bent into a substantially L-shape is fixed to the tip of this detector 18. There is an L on the tip of the copying sensor 19.
A straight portion 20 bent into a letter shape is provided. The length of this straight portion 20 is longer than the distance between both ends of the base of the wavy bent portion 2. Welding torch 16 is connected to welding machine 2211C via cable 21, and
2 and the corrugated heat sink 1, which is the welding base material, is a cable 23.
, and forms a welding current path with the welding torch 16.

Further, the detector and the control device 13 are connected by a cord 24, and the detector 18 supplies an output signal to the control device 13 based on a signal from the scanning sensor 19.

On the other hand, what is indicated by the reference numeral 25 is a flexible pressing body, such as a hose, which presses the corrugated heat sink 1 with a predetermined pressure. The upper edge of the is pressed.

This hose 25 is provided to uniformly press and restrain the upper end of the bent portion 2 even if the height of the bent portion 2 is different. Although not shown, the hose 25 is pressed downward from above by a separate pressing member, and furthermore,
It is supported from below by a support member in the vicinity of the overlapping margin B between the corrugated heat sink 1 and the edge plate 4.

Next, a welding method using each member configured as described above will be explained.

First, a welding line is determined by aligning the straight portion 20 of the copying sensor 19 with the side edge of the corrugated heat sink 1, and the welding torch 16 is adjusted to match this welding line.

In this state, the welding machine 22 is operated to supply current to the welding torch 16, and welding is performed while the traveling carriage 8 is traveling. If the weld line changes in the vertical direction during this welding, the amount of change is notified to the control device 13 via the cord 24, and the vertical slider 12 is actuated to follow the change in the vertical direction. Furthermore, if the welding line changes in the horizontal direction, the horizontal slider 11 is operated in exactly the same manner to follow the movement in the horizontal direction. During the welding operation, the straight portion 20 of the copying sensor 19 is longer than the width of the portion forming the approximately triangular space between the base ends of the bent portion 2. 20 will not fit in, and therefore the weld line will not come off.

In addition, since the corrugated heat sink 1 is pressed by the hose 25, the overall twist and warp of the corrugated heat sink 1 is corrected and it is welded to the edge plate 4 in close contact.

Also, even if there is a difference C in the side edges of the corrugated heat sink 1,
If the distance 1 between the tip of the welding torch 16 and the straight part 20 of the copying sensor 19 is approximately the same or less than the distance between the bases of the space 6, welding will be performed without welding errors caused by misalignment of the welding line. .

That is, when the distance 1 between the tip of the welding torch 16 and the straight part 20 of the copying sensor 19 is smaller than the distance A between the wavy bent parts 2, there is a space 6 between the copying sensor 19 and the welding torch 16. There is only one, but if this is not the case, there may be two or more, and the discrepancy C causes a copying error, so the distance between the copy sensor 19 and the tip of the pressure welding torch 16 should be as narrow as possible.

As described above, it is generally preferable that the distance 1 in the welding direction between the tip of the straight portion 20 of the copying sensor 19 and the tip of the welding torch 16 be as small as possible; however, if the distance 1 is too small, the straight portion 20 may Since there is a risk of burnout due to the arc from 16, it is determined taking these points into consideration.

In reality, the dimensions of the welding torch 16 and copying sensor 19,
Considering the positional relationship, etc., a minimum interval of about 30 mm is selected. In addition, in the above explanation, the case where only one edge plate 4 is welded is explained, but in reality, two sets of welding equipment are used to weld both edge plates 4 and 5 and the corrugated heat sink 1 at the same time. Welding is preferred.

In addition, although the embodiment shows a case in which the base material is a corrugated heat sink for a transformer, the present invention is not limited to this, and includes various modifications without departing from the gist of the present invention. Of course. As is clear from the above description, according to the present invention, the welding torch is caused to follow the welding line by detecting the welding line with the tracing sensor while pressing the corrugated heat sink and the edge plate with the flexible pressing body. Since the structure is such that welding is performed between the two, it becomes possible to automatically weld the corrugated heat sink and the edge plate, which was previously impossible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a corrugated welded plate, FIG. 2 is a perspective view illustrating the joining state of the corrugated welded plate and the edge plate, and FIG. 3 is an explanatory diagram illustrating the method of the present invention.

Claims (1)

[Claims] 1. A corrugated heat sink formed by folding a thin metal plate into a wave shape at predetermined intervals and crushing and welding both ends of the bent portions, and a predetermined edge plate welded to the side edges of the corrugated heat sink. When overlapping and welding at the overlap margin, the bulges bulging outward from the sides of the plurality of bent portions of the corrugated heat sink are pressed with a flexible pressing body made of a hose having a predetermined internal pressure. The welding line is traced by a copying sensor that moves along the welding line, and the welding torch is moved in conjunction with the copying sensor, so that the welding line between the corrugated heat sink and the edge plate is traced by the welding torch. A method for automatically welding a corrugated heat sink and an edge plate, characterized in that the welding is performed automatically by the following steps. 2. The length of the portion of the copying sensor in contact with the weld line is made longer than the maximum width of the space in the direction of the weld line at the base of the bent portion of the corrugated heat sink so that the weld line is made to follow. A method for automatically welding a corrugated heat sink and an edge plate according to claim 1.