JPS5921712B2 - Seam welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for circumferentially seam-welding a thick-walled cylinder and a thin-walled cylinder that are coaxially stacked.

[Prior art]

Fig. 1 is a partially cutaway perspective view showing the configuration of the main parts of a conventional seam welding device of this type, in which 1 is a thick-walled cylinder, 2 is a thin-walled cylinder, and 3 and 4 are rotating electrodes. The above-mentioned cylinders 1 and 2, which are formed in a pair of disk shapes and overlapped, are held together with a predetermined pressing force, and one of the rotating electrodes is rotated in the direction of arrow A,
A means (not shown) is provided for rotationally driving the cylinders 1 and 2 stacked on top of each other in the direction of arrow B by frictional force without damaging their mutual positional relationship.

On the other hand, by applying a voltage between the rotating electric current &, 3 and 4, the cylinders 1 and 2
A welding current is passed through the welding means. In the conventional seam welding device configured as described above, the pressing force for welding the stacked cylinders 1 and 2 is used in combination with the pressing force for generating friction for rotating the cylinders 1 and 2. Therefore, when the wall thickness of the cylinder 2 is particularly thin, the following drawbacks tend to occur.

In other words, 0) When pressing with the optimum welding pressure to obtain good welding, the friction between the cylinders 1 and 2 and the rotating electrodes 3 and 4 is insufficient, causing them to slip, making the rotation speed unstable and causing the welding speed to become unstable. The welding becomes uniform and good welding cannot be obtained.

On the other hand, when the pressure applied by the rotating electrodes 3 and 4 is increased to prevent slippage, the rotating electrode 3 bites into the thin cylinder 2, increasing the contact area and lowering the current density.
In order to obtain proper welding, it is necessary to maintain a constant current density, so if the current value is increased, the contact area will further increase due to the increase in the molten part and the pressurizing force, which will repeat the vicious cycle. Welding becomes impossible.

In addition, the finish is poor, such as the machined surface becoming dented. [Summary of the Invention] This invention has been made to eliminate the drawbacks of the conventional device described above, and has a pressing force that can generate frictional resistance to transmit the driving force to drive a thick cylinder one rotation. at least two rotary support members that abut against the circumferential surface of the thick-walled cylinder; and at least two rotary support members that abut the circumferential surface of the thin-walled cylinder and apply optimal welding pressure to the thick-walled cylinder via the thin-walled cylinder. a rotating electrode that is pressed, the thick-walled cylinder is rotated by rotating at least one of the rotating support members, and the thick cylinder is rotated between the rotating electrode and a selected one of the rotating support members. The present invention provides a seam welding device that seam-welds the thin-walled cylinder and the thick-walled cylinder by applying a welding current to the cylinder.

[Embodiments of the invention]

FIG. 2 is a partially cutaway perspective view showing essential parts of an embodiment of the present invention, and numerals 4 and 5 are rotation support members for rotational driving.

Reference numeral 7 denotes a rotational drive mechanism for rotating the rotational support member 5 in the direction of arrow A, and is composed of a motor or the like.

Reference numeral 8 denotes a support mechanism for supporting the rotary drive mechanism 7, which is connected to a columnar support 9 so as to be able to slide up and down.

10 is a pressing mechanism, consisting of an air or hydraulic cylinder;
It is fixed to the upper end of the support 9.

The end of the movable part 101 is connected to the rotational drive mechanism 7. This pressing mechanism 10 has a movable portion 10
1, the rotational support member 5 is pressed against the circumferential surface of the thick-walled cylinder 1, and the pressing force is the driving force for the rotational support member 5 to rotationally drive the thick-walled cylinder 1. The size is such that frictional resistance for transmitting force can be generated between it and the circumferential surface of the thick cylinder 1. In this embodiment, by pressing the partial rotational support member 5 with the pressing mechanism 10, as a result, the thick-walled cylinder 1 is held between the two rotational support members 4 and 5 with the above pressing force, and the rotational support member 5 is pressed. The cylinders 1 and 2 are rotated in the direction of arrow A and rotated in the direction of arrow B at the optimum welding speed.

On the other hand, the rotating electrode 3 is pressed against the surface of the thin-walled cylinder 2 by the pressing mechanism 11f1C so as to press the thin-walled cylinder 2 against the thick-walled cylinder 1 at an optimal welding pressure that will result in good welding.

The structure of the support mechanism 12, support body 13, and rotation drive mechanism 14 is as follows:
It is structured almost the same way. Circumference, pressing members 10 and 11
The pressing force of each can be controlled independently.
Then, a voltage is applied between the rotating support member 4 and the rotating electrode 3, and a welding current flows, and as the cylinders 1 and 2 rotate, they are seam-welded. With this configuration, the rotation support members 4 and 5 apply the pressing force necessary to rotate both the cylinders 1 and 2, and on the other hand, apart from this pressing force, the rotating electrode 3 applies an optimum pressing force. Since the pressing force can be selected independently, the above-mentioned drawbacks of the conventional method can be solved.

FIG. 3 is a partially cutaway perspective view showing the main parts of another embodiment of the present invention, in which 61, 62, and 63 are cylindrical rotation support members;
In this example, three rotation support members 61, 62, 63 are used to form a cylinder.
The outer circumferential surface of the rotary support member 6 is supported at three locations.
3 is configured to apply a rotational driving force for rotating the cylinders 1 and 2 and a pressing force by a device (not shown) such as the pressing member 10 and rotation 1 driving member 7 shown in FIG. has been done.

The rotary support member 61 or 62 also serves as a rotary electrode and also has the function of receiving the pressing force applied by the rotary electrode 3 to perform optimal welding.

With this configuration, even if the cylinders 1 and 2 are large or long, they can be stably supported, and as in the previous embodiment, good welding and a good surface finish can be obtained. can.

In the first embodiment, a configuration is shown in which one rotational support member 5 is disposed at a symmetrical position of the rotational support member 4 which also serves as an electrode, but the configuration is not limited to this, and the rotational support member 5
The cylinders 1 and 2 may be held stably by disposing a plurality of them at predetermined intervals, or by disposing rotary support members that abut both sides of the cylinder 1.

Further, instead of the rotation support member 5, the rotation support member 4 may be used for pressing. In this case, the sum of the pressing force of the rotating electrode 3 and the pressing force of the rotating support member 4 is set to be the optimum welding pressure. Similarly, in the second embodiment, any one or more of the rotation support members 61, 62, and 63 may apply a pressing force for rotation and drive, and may also be rotationally driven. . Also in this case, the pressing force between the rotating electrode 3 and the rotating support member is adjusted so that the pressing force applied between the two cylinders by the rotating electrode 3 and the rotating support member becomes the optimum welding pressure.

Furthermore, in the above embodiment, the case where the thin-walled cylinder 2 is seam-welded to the inner circumferential surface of the thick-walled cylinder 1 has been described, but when the thin-walled cylinder 2 is seam-welded to the outer circumferential surface of the thick-walled cylinder 1, It goes without saying that the same application can be made by configuring the cylinders 1 and 2 to be rotatably driven by supporting the inner circumferential surface of a thick cylinder.

〔Effect of the invention〕

As is clear from the above description, the present invention is directed to an apparatus for circumferentially seam welding a thick-walled cylinder and a thin-walled cylinder that are stacked coaxially using a rotating electrode. The pressing means of the rotating electrode that presses the thick-walled cylinder against the thick cylinder, and the pressing means of the rotating support member to obtain the frictional resistance that transmits the driving force that rotates the stacked cylinders can be adjusted independently. Because of this structure, the pressing force of the rotating electrode can be set according to the wall thickness of the cylinder to be welded, making it easy to obtain good welding and finishing, which has a great practical effect. It is something.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the configuration of the main parts of a conventional two-layer cylindrical seam welding device, and FIGS. 2 and 3 respectively show the main parts of the seam welding device of an embodiment according to the present invention. FIG. 2 is a partially cutaway perspective view showing the configuration.

Claims (1)

[Claims] 1. In a device in which a thick-walled cylinder and a thin-walled cylinder are coaxially stacked and seam-welded in the circumferential direction, at least two rotational supports that come into contact with the circumferential surface of the thick-walled cylinder and sandwich the thick-walled cylinder. a rotational drive mechanism that rotationally drives at least one of the rotational support members; and a rotational drive mechanism that rotates the thick-walled cylinder between the rotational support member that is rotationally driven by the rotational drive and the peripheral surface of the thick-walled cylinder. a first pressing mechanism that presses the rotation support member against the circumferential surface of the thick-walled cylinder in order to generate frictional resistance that transmits the driving force for rotational driving; and a first pressing mechanism that abuts the circumferential surface of the thin-walled cylinder. a rotating electrode; a second pressing mechanism configured to press the rotating electrode against the circumferential surface of the thin-walled cylinder with an optimal welding pressure, and generating a pressing force separately from the first pressing mechanism; . A seam welding device comprising power supply means for passing a welding current between the rotating electrode and a selected one of the rotating support members.