JPS5920431B2 - Welding equipment for T-shaped joints of cylindrical materials - Google Patents

Description

[Detailed Description of the Invention] This invention provides automotive parts, metal furniture, etc.
The present invention relates to a welding device for joining parts of orthogonal or oblique cylindrical bodies (including cylindrical bodies, representatively referred to as cylindrical bodies).

Conventionally, this type of welding has generally been carried out manually, which inevitably requires skilled welding workers, which tends to result in variations in work quality and low work efficiency.
On the other hand, automatic welding machines specialized for mass production have also appeared, but they have a complicated structure, are expensive, tend to break down, and are difficult to maintain.

In order to improve the conventional welding work as mentioned above, a few inventions have been proposed, one of which is the Japanese Patent Publication No. 51-348.
There is No. 22 "T-piece automatic welding device".

This consists of a rotating mechanism for the pipe to be welded, a pipe gripping mechanism, and a welding head movement mechanism. It is to run in conjunction with a rotating device in the right angle direction. Therefore, a traveling mechanism for moving the welding head is essential, which requires a traveling truck, a rack and pinion, and a variable speed electric motor, making the mechanism complicated and expensive. In addition, there is also a special publication No. 53-11503 “Made of T-tube.

``Building equipment'' has been proposed.

This involves horizontally reciprocating the torch while rotating it 360 degrees, and also swings the workpiece in conjunction with this, so a cross slider mechanism is especially used for this purpose.
Further, in order to rotate the torch, a bevel gear box that moves horizontally integrally with the torch is required, which also makes the mechanism complicated and expensive. In view of the above, an object of the present invention is to provide a semi-automatic welding device using a simple mechanical mechanism. The gist of this invention is that the workpiece is not moved but is simply rotated gently at a predetermined position, and the torch simply oscillates at a predetermined angle in conjunction with the rotation of the workpiece without rotating or moving horizontally. This method involves welding the entire circumference of the joint by directing the tip of the torch to the joint between the pipe and the branch pipe, and satisfies the following requirements.

1) The extension line of the torch support shaft must be within the vertical plane between the exact reach and shortest position of the workpiece joint.

2) The point where the extension line of the torch support shaft intersects with the workpiece must be below the top position of the joint.

3) Providing means for the torch support to swing about the torch support shaft by an angle that is not on the left or right of the vertical plane.

4) Providing means for making the ratio of the number of rotations of the workpiece and the number of horizontal swings of the torch 1:2.

Hereinafter, the configuration of the present invention will be explained based on illustrated examples. Figure 1 shows a T-shaped welded product M (hereinafter referred to as the work).
In this example, 1 is a branch pipe, 2 is a main pipe, and 3 is a joint. Figure 2 is a plan view of the workpiece M in Figure 1,
This figure shows the tracing angle (swing angle) α of the torch 4 and the pointing point of the tip 4a of the torch 4. Figure 3 is a front view showing the relative position with the torch 4, and Figure 4 is a front view of the torch 4. FIG. 2 is a schematic diagram of the overall operation. As can be seen in Fig. 4, the oscillating motion of the torch 4 does not require any complicated mechanism or electrical control system, and is made up of only very common mechanisms such as a crank, rod, etc., and a deceleration motor 15). Power is transmitted to the torch support 6 through the crank 14, the lever 13, the arm 12, the rod 11, the connecting arm 10, and the lever 9. It is starting to sway.

On the other hand, the torch support shaft 5 is supported by a torch support bearing 7, and the torch support bearing 7 can be moved from side to side as appropriate on a torch support bearing sliding bar 8 according to the size of the workpiece M. At the start of the welding work, the position of the torch support bearing 7 is set to match the size of the workpiece M, but during the welding work, the torch support bearing 7 remains fixed to the torch support bearing sliding bar 8 and does not move.

In addition, when attaching and detaching the workpiece M to and from the workpiece support 18, the torch 4 is constructed to be lifted up about the torch support bearing sliding bar 8. The work M is connected to the main shaft 17 and is held concentrically with the main shaft 17 by a work support member 18 . The relationship between the torch 4 and the joint portion 3 of the workpiece M is as follows. (1) The extension line N of the torch support shaft 5 is the farthest position A of the joint 3 (the uppermost position of the joint 3 between the cylindrical body 1 and the cylindrical body 2 in Fig. 3) and the shortest position B (Fig. 3). At the joint point 3 of cylinder body 1 and cylinder body 2
is in the vertical plane P midway between the lateral end positions of

(2) The point C where the extension line N of the torch support shaft 5 intersects with the workpiece M is located below the uppermost position A of the joint location 3. (3
) The torch support body 6 is configured to swing from side to side by an angle α with the vertical plane P as the center and the torch support shaft 5 as the center.

As an example of this specific mechanism, FIG. 4 illustrates a configuration in which deceleration motor power is transmitted through a transmission mechanism such as a crank or a rod.

(4) The transmission mechanism from the deceleration motor 15 is configured so that the ratio of the number of revolutions of the workpiece M to the number of left and right swings of the torch 4 is 1:2.

In the example shown in Figure 4, the ratio of chain wheels 20 and 21 is 1:2.
shall be. Next, the reasons for the above configuration are as follows: (1)
This is to ensure that the distance between the workpiece M and the tip of the welding line 19 coming out from the mouth end of the torch 4 does not change even when the torch 4 is swung from side to side, and if this fluctuation occurs, the welding current changes. This is because the welding conditions vary depending on the location, making it impossible to obtain a satisfactory result.

(2) If the point C where the extension line N of the torch support shaft 5 intersects the workpiece M coincides with the uppermost position A, the left and right movement of the torch 4 will be zero, and therefore the movement of the torch 4 will be zero. This is because circumferential welding is possible, such as at a joint between a cylinder and a flat plate, but it is impossible to weld when there is a contour.

(3) The profiling angle α of the torch 4 is as shown in Fig. 2.
A predetermined angle is set based on the size of the workpiece M with respect to the vertical plane P as a boundary.

Generally, this profiling angle is in the range of about 10 degrees to about 90 degrees,
A value of about 100 to 300 is often taken. (4) There are two joint locations 3 of the workpiece M on both sides of the top position A and the bottom position x in FIG. The ratio should be 1:2.

direction, the main shaft 1 is rotated by a lever operation using a known mechanism (not shown).
Gently rotate the torch 4 by one rotation, and
The structure is such that the clutch is stopped by swinging from side to side and disengaging the clutch. Next, to explain how this invention device is used, first, the deceleration motor 15 is rotated, the workpiece M is held on the workpiece support member 18, and the main shaft 1 is moved by operating a lever (not shown).
7 slowly once, and in conjunction with this, the torch 4
is swung left and right, and at the same time an arc is made to eject a separately provided reducing gas (generally carbon dioxide or argon mixed gas, etc.) to perform welding.

When welding is finished, remove the workpiece M from the workpiece support 18,
Next, the unwelded workpiece M to be welded is clamped to the workpiece support member 18.

Since this invention has the above-described configuration, it does not require a complicated automatic control mechanism, nor does it use a cam, which is common knowledge in imitation control. It is possible to easily weld orthogonal or oblique T-shaped welds of materials with simple operations, regardless of whether or not you have welding experience, and even if the diameters of the main pipe and branch pipes are different, there is no problem. Since the mechanism is simple and there are no breakdowns, maintenance is easy.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a perspective view of the workpiece, Figure 2 is a plan view of the workpiece showing the torch tracing angle and the pointing point of the torch tip, and Figure 3 is a front view of the workpiece. The figure shows the position in relation to the torch, and FIG. 4 is a schematic diagram of the overall operation. 1... Branch pipe, 2... Main pipe, 3... Joint location, 5...
...Torch support shaft, 6...Torch support, A...The furthest (top) position of the joint, A''...The lowest position of the joint cylinder.
B: Shortest position of the joint, C: Point where the extension line of the torch support shaft intersects with the workpiece, M: Workpiece, N: Extension line of the torch support shaft, P: Joint location of the workpiece vertical plane midway between the farthest and shortest positions of

Claims (1)

[Claims] 1. When T-welding a branch pipe to a main pipe, in a welding device equipped with a workpiece rotation mechanism, a workpiece holding mechanism, and a torch swinging mechanism, (1) the extension line of the torch support shaft must be and in the vertical plane intermediate the shortest position,
(2) The point where the extended line of the torch support shaft intersects with the workpiece is below the top position of the joint, and (3) the torch support is at an angle with the torch support shaft as the center that is not on the left or right of the vertical plane. Welding of a T-shaped joint of a cylindrical material, characterized in that a means for swinging is provided, and (4) a means is provided such that the ratio of the number of rotations of the workpiece to the number of left and right swings of the torch is 1:2. Device.