JPS6171181A - Automatic welding method of waveform radiation plate and edge plate - Google Patents

Abstract

PURPOSE:To weld automatically a weld line of a waveform radiation plate and an edge plate by interlocking a welding torch with a profile sensor which presses the waveform radiation plate and the edge plate by a flexible pressing body and moves along the weld line. CONSTITUTION:Welding is executed by determining a weld line by aligning a straight line part 20 of a profile sensor 19 with a side edge of a waveform radiation plate 1, operating a welding machine 22 by adjusting a welding torch 16 to match the weld line, and running a running truck 8. In this case, when the weld line is varied in the upper and lower directions, a variation quantity is informed to a control device 13 through a cord 24, and a vertical direction slider 12 is operated. Also, when the weld line is varied in the horizontal direction, a horizontal direction slider 11 is operated. Moreover, a hose 25 is deformed along a shape of the upper part at every bent part of the waveform radiation plate 1, and adheres tightly to an edge part 4 with a sufficient pressing force. Even if there is a stagger in the side edge of the waveform radiation plate 1, in case when a distance l between the tip of the welding torch 16 and the straight line part 20 of the profile sensor 19 is below the almost same as a distance between base parts of a space 6, a welding error caused by a fact that the weld line is dislocated is not generated.

Description

[Detailed description of the invention] The non-invention relates to a method of welding a corrugated heat sink and an edge plate.

In particular, it relates to a method of welding a corrugated heat sink formed from A'L& and an edge plate connected thereto.

Corrugated heat sink 1 A corrugated heat sink as shown in FIG. 1 is used in a liquid-filled tank having heat sinks, such as a case of a transformer.

In the example shown in Figure 1, a thin metal plate (x
) 'r: Fold into a wave shape at intervals A to form the entire folded part (2), and crush both ends (2a) (2N+), leaving the center part (3) of this folded part (2). It is then welded and used as the side plate of the liquid tank.

If a corrugated heat sink like the one above is used, the overall rigidity will be insufficient as a side plate for the evening/dark.

Usually, as shown in FIG. 2, a structure is adopted in which edge plates 141 and 151 each having a thickness of about 3W are welded to both sides of a corrugated heat sink to increase the rigidity of the whole.

One of the edge plates (4) actually extends upward, and a curved part (4A) folded into an arc shape is formed over almost the entire length on its outer edge.
A lid (not shown) is attached to the.

In addition, the outer edge of the other edge plate (5) is bent at a right angle to form a bent portion (5A).
A bottom plate (not shown) is welded to the bottom plate. In addition, edge plate +4
The outer edge of 1.151 may be bent toward the bent portion (2).

By the way, when the structure shown in FIG. 2 is adopted, the edge plate 141. +51 and the corrugated heat sink il+ are welded at a joint with a predetermined overlap B.
a).

(2b) a. Because the N plate is bent and formed, a nearly triangular space (6) is created, and a difference C occurs between the end faces of the bottom plate (7) between adjacent wavy parts during molding. do. In addition, because the entire corrugated heat sink (1) twists or bends due to internal residual stress during molding, it has been impossible to automatically weld it using an automatic welding machine. Therefore, actual welding must rely on the manual work of welding engineers with advanced welding skills, and it is difficult to ensure stable welding quality.

The drawback was that productivity was moderately low.

In addition, as conventional examples judged to be related to the present invention, Japanese Patent Application Laid-open No. 53-36629 and Utility Model Application No. 53-125199
There are 2% Japanese Unexamined Patent Publications No. 104543/1983 and Japanese Utility Model No. 124023/1983.

JP-A-53-36629 discloses a method of automatically welding a corrugated heat sink and an edge plate while simultaneously transporting them.

This Japanese Patent Laid-Open No. 5-1989 only takes into consideration the fact that the deformation of the edge plate that occurs after welding is corrected using rollers, and no consideration is given to the nature of the pressing contact between the corrugated heat sink and the edge plate.
In the method disclosed in Japanese Patent No. 3-36629, it is virtually impossible to automatically weld the corrugated heat sink and the edge plate. The reason for this is as follows. That is, when welding the corrugated heat sink and the edge plate, the overlapped portion of the two is
Since the welding line is overlapped at the knee allowance, the distance at the bottom of both ends of the bent part of the corrugated heat sink is the welding line of a generally fillet joint of the armor shell, and the middle of the bent part is a lap joint. This will be the welding line. The above-mentioned general fillet joints require sufficient structural welding strength for transformer cases, etc., and generally welding conditions where the heat input is higher than that of double-lap joints (for example, MI
G welding requires welding using a controlled welding current. Therefore, theoretically, in fillet joints, strong condition 1
Weak conditions are required for gun joints, and welding is required while switching between these two conditions.1 In normal MIG welding, a stable weld bead cannot be obtained because fillet joints are short, and in practice Welding under strong conditions is being performed.

Therefore, a sufficient pressing force is required for a single-lap joint, and if this is insufficient, sufficient adhesion will not be obtained, and since the corrugated heat sink is usually thin, about one piece, the heat input will be excessive, and the corrugated heat sink will This is because there is a problem in that the edge of the weld bead is easily fused.

Further, in Japanese Utility Model Application Publication No. 53-125199, a general breaking clamp material is interposed between rigid members.

The material to be clamped is secured to the above rigidity using a bag body having OJ flexibility. There is a general clamping device that suppresses clamping through a member having a welding line, and there is also a welding line clamping device that is technically similar to the one disclosed in Japanese Utility Model Application Laid-Open No. 54-124023 and the one disclosed in Japanese Utility Model Application Publication No. 53-125199. However, Japanese Patent Application Laid-Open No. 53-104543 discloses a scanning sensor.

Historically, Japanese Patent Publication No. 45-1390 (Fig. 6) and Japanese Patent Application Laid-Open No. 54-1 are examples of prior art considered to be related to the present invention.
No. 50348, Japanese Patent Application Laid-open No. 52-143543,
Utility Model Application Publication No. 51-23020, and [Welding Handbook JP
10613 to 1069 (manufactured by Maruzen Co., Ltd. on February 28, 1972), but these conventional examples have been discontinued so as to have little relevance to the present invention, so their explanations will be omitted.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a corrugated heat sink and an edge plate that are configured to automatically weld the corrugated heat sink and the edge plate. It is to provide automatic welding method.

In order to achieve the above objective, the upper end of the bent part of the corrugated heat sink is pressed by a flexible pressing body, the weld line is traced by a copying sensor that moves along the welding line, and the welding line is interlocked with this copying sensor. The entire feature is that the welding torch is moved to automatically weld the corrugated heat sink and the edge plate.

Preferred embodiments of the present invention will be described below based on two drawings.

FIG. 3 explains one embodiment of the present invention.

In the figure, the symbol (8) is a running bogie, which runs entirely on the rail aω via the JP wheel (9).This rail 011 is laid almost parallel to the weld line, and the arrow in the figure shows the weld line It shows the direction of travel.

A horizontal slider αυ is provided on the top Vc of the traveling carriage (8), and a vertical slider Q3 is attached to this horizontal slider αυ.9. The sliding amounts of these two sliders aυ, 03 are controlled by a control device #a3.

One end of the vertical slider Q211C is fixed to the holder 〇41, and the other end of this holder 〇41 is divided into two parts, and a welding torch ffG is attached to the tip of one arm αS.
- 1 is added, and a detector QFj is fixed to the tip of the other arm aη. A scanning sensor a9 bent into a substantially L-shape is fixed to the tip of the detector a♂. Copying sensor α
At the tip of 9, there is provided a straight portion (2) bent into an L-shape. The length of this straight part (2) is longer than the distance between both ends of the base of the wavy bent part (2).

The welding torch rm is connected to the welding machine @ through the couple aV, and the welding machine (c) and the corrugated heat sink f, which is the welding base material,
1) is connected by a cable (c), and forms a welding flow path with the welding torch αe.

Further, the detector and the control device (lJ) are connected by a cord (2), and the detector α supplies an output signal to the control device α3 based on the signal from the scanning sensor 09.

Part 2 (c) indicates a flexible pressing body 2, for example, a hose, which presses the corrugated heat sink tel with a predetermined pressure, and an internal pressure of about several'/ci is applied inside.

The upper end of the wavy bent portion (2) is pressed. Even if the height of the bent part (2) is different, this hose (end) is
2) is provided to uniformly press and restrain the upper end of the device.

Although not shown, the hose (c) is pressed downward from above by a separate holding member.

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 in two or more ways will be explained.

First, connect the straight part (A) of the copying sensor fi9 to the corrugated heat sink (
11, and adjust the welding torch σQ to match the welding line. In this state, the welding machine is operated to supply current to the welding torch ati, and welding is performed while the traveling carriage (8) is running.

If the welding line changes in the vertical direction during this welding, the ft1l control device <131
The vertical direction slider Q5 is actuated to follow the change in the vertical direction.

Furthermore, if the weld line changes in the horizontal direction, the horizontal slider αυ is activated and follows the horizontal movement amount.

During welding work, the straight part ■ of copying sensor 9.

Since it is longer than the width of the part that forms the hollow triangular space between the base ends of the bent part (2), the straight part (2) will not fit into the triangular space (6) during copying work. Therefore, the weld line will not come out of place.

In addition, since the corrugated heat sink (1) is pressed by the hose device, the entire corrugated heat sink (1) may be twisted.

The hose (c) is deformed along the upper shape fC at each bend regardless of warping or variations in the height of the bend,
The corrugated heat sink (1) is suitable for welding with the edge plate (14) because even if welded under 92+ conditions, which allows for close contact with the edge plate (14), a portion of the heat input can be sufficiently released to the edge plate. The green weld bead never becomes fused.

Furthermore, even if there is a difference C in the side edges of the corrugated heat sink (1), the distance l between the tip of the welding torch ae and the straight part of the copy sensor '+j- (19) is the space (between the base of the disease) If it is approximately the same as the distance or less, welding can be performed without welding errors caused by misalignment of the welding line.

That is, when the distance l between the tip of the welding torch αe and the straight part of the copying sensor a9 is smaller than the distance A between the bent parts (2) of the waveform, the distance between the copying sensor a9 and the welding torch αθ There is only one space (6) in , but in other cases there may be two or more.

The gap C between the copying sensor arJ and the tip of the welding torch t1G should be as narrow as possible since it causes a copying error.

In this way, copying sensor a! H7) It is generally preferable that the distance l in the welding direction between the tip of the straight part ■ and the tip of the welding torch αe be as small as possible, but if the distance l is too small, the straight part ■ will be burned out by the arc from the welding torch αG. Therefore, these points are taken into account when determining the amount. Practically speaking, an interval of at least about 30 W is selected, taking into account the size and positional relationship of 1 to the welding torch αe and copying sensor.

In addition, in the above explanation, we have explained the case where welding is performed only with one edge plate (4), but is it actually a welding device? It is preferable to use two sets to simultaneously weld both edge plates 14+, +51 and the corrugated heat sink (1).

Furthermore, although the embodiments have shown 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.

Since the structure is such that the corrugated heat sink and the edge plate are pressed by a flexible pressing body, a welding line is detected by a tracing sensor, and the welding torch follows to perform welding between the two.
It becomes possible to automatically weld the corrugated heat sink and edge plate, which was previously impossible and rare.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the corrugated welded plate, and Figure 2 is the state of connection between the corrugated welded plate and the edge plate. The perspective view and FIG. 3 are explanatory diagrams for explaining the method of the present invention. Are the same parts in each figure the same numbers? (I) is a corrugated heat sink. (2) is the bending part, (6) is the space, (8) is the traveling trolley, α
II is a horizontal slider, +13 is a vertical slider, 131 is a control device, 114tri holder, α second is a detector, α9 is a scanning sensor, ■ is a straight section, and c5 is a hose.

Claims (1)

[Claims] (1) When welding a corrugated heat sink formed by bending a thin metal plate into a corrugated shape at predetermined intervals and an edge plate welded to the side edge of this corrugated heat sink with a predetermined overlap margin, the corrugated substantially directly pressing the upper ends of the plurality of bent portions of the heat sink with a flexible pressing body made of a hose having a predetermined internal pressure, and tracing the weld line by a tracing sensor that moves along the weld line; A corrugated heat sink characterized in that a welding torch is moved in conjunction with the copying sensor, and the welding line between the corrugated heat sink and the edge plate is automatically welded by the welding torch. Automatic welding method for edge plates.