JPH0379108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed rotating arc welding device that performs welding by rotating an arc at high speed.

[Prior Art] A conventional high speed rotating arc welding device was proposed by the applicant in Japanese Patent Application Laid-open No. 104684/1984. This conventional high-speed rotating arc welding equipment
Shown in Figures A and B.

A in FIG. 3 is a schematic side view of a cross section of a conventional rotary arc welding device, and B is a plan view of a gear section that provides rotational motion to the electrode of the device shown in A.

In the figure, 1 is an electrode, 2 is a welding wire, 3 is a rotating motor, 4 is a shaft of the motor 3, 5 is a gear attached to the shaft 4 and is given high-speed rotation by the motor 3, and 6 is a gear that provides high-speed rotation by the gear 5. The given gear 7 is a self-aligning bearing (disc) that supports the electrode 1, and the gear is eccentrically set by a predetermined distance d from the center of the gear 6 so that the rotation of the gear 6 causes the electrode 1 to rotate at high speed. It is attached to 6. Reference numeral 8 denotes a self-aligning bearing that serves as a fulcrum for the rotating electrode 1. 9 is a bearing that supports the gear 6; 10 is a gear box attached to the frame of a welding cart (not shown); 11 is a power supply cable for supplying power to the electrode 1; 12 is a power supply cable terminal; and 13 is a power supply cable. A terminal mounting hole, 14 a welding arc, 15 an object to be welded, and 16 a support for the electrode 1 are slidably attached to the gearbox 10.

Driven by the rotary motor 3, the electrode 1 is rotated through the gears 5 and 6 using the self-aligning bearing 8 as a fulcrum, and as a result, the tip of the welding wire 2 and the welding arc 14 sent out from the lower end of the electrode 1 are , performs a rotating circular motion on the workpiece 15. Since the electrode 1 itself does not rotate around its axis when the lower end of the electrode 1 is in rotational circular motion, it is possible to directly supply power to the electrode 1 through the power supply cable 11 as shown in the figure. There is.

Further, the rotational diameter D of the tip of the welding wire 2 that moves in a rotating circular motion can be set to a desired size by changing the eccentricity distance d between the gear 6 and the self-aligning bearing 17. was.

Note that the self-aligning bearing 8, which serves as the fulcrum of the electrode 1, has a small movement in that part of the electrode 1.
It may be replaced with a spherical bearing.

The transmission system of the rotary motor 3 to the gear 5 is not limited to gears, and other transmission mechanisms can be used.

[Problems to be Solved by the Invention] In rotating arc welding, the width of the weld bead formed is determined by the rotating diameter of the arc, and therefore It is desirable to variably control the rotating diameter of the arc. However, the conventional high-speed rotating arc welding equipment described above does not have a means for varying the rotating diameter of the arc, and the rotating diameter of the arc during welding is determined by the design value of the groove width depending on the eccentric distance d. (hereinafter referred to as the designed groove width), a constant value set in advance is held. Therefore, as the groove width fluctuates, there will be excess or deficiency in the rotating diameter of the arc. For example, when the groove width becomes wide, the rotating diameter becomes insufficient, which tends to cause insufficient penetration, and conversely, when the groove width becomes narrow, the rotating diameter becomes excessive, which may cause undercuts.

The present invention was made to solve these problems, and provides a high-speed rotating arc welding device that enables variable control of the rotating diameter of the arc during welding without losing the advantages of conventional welding devices. The purpose is to

[Means for Solving the Problems] A high-speed rotating arc welding device according to the present invention supports an electrode rotatably by a predetermined distance eccentrically from the center of a rotating disk, and A high-speed rotary arc welding device that moves an arc generated from the electrode in a rotational circular motion by rotating the disk using the upper part of the electrode as a fulcrum, comprising a driving means for vertically moving the fulcrum at the upper part of the electrode. This solves the above problems. In this case, according to a preferred embodiment of the invention, the driving means is a rack and pinion mechanism driven by a motor.

[Operation] In the present invention, the driving means moves the upper fulcrum of the electrode up and down, thereby changing the height position of the fulcrum and changing the distance l between the disk supporting the electrode and the fulcrum. . Since the rotational diameter of the arc changes as the distance l changes, the rotational diameter of the arc can be variably controlled even during welding.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic side view of a cross section of a high-speed rotating arc welding device according to an embodiment of the present invention.

In the figure, numerals 1 to 16 are the same as the high-speed rotating arc welding apparatus of the prior art described above.

However, in the present invention, a rack portion 18 is formed on the support body 16, and a pinion 19 is provided so as to mesh with this rack portion 18.
These rack portion 18 and pinion 19 constitute a rack and pinion mechanism. The pinion 19 is connected to a shaft 21 of a motor 20 attached to the gearbox 10, and the rotation of the motor 20 moves the support 16 up and down to variably control the magnitude of the distance l. That is, the size of the rotating diameter of the arc is variably controlled. In this way, by providing the driving means for moving the fulcrum of the electrode 1 up and down, it becomes possible to vary the rotational diameter of the arc even during welding.

FIG. 2 shows an example of a control block used in variable control of the rotating diameter of the arc by the apparatus of the present invention.

In the figure, the value G of the groove width is determined by the groove width detector 22.
However, the groove width detector 22 may include an arithmetic circuit that calculates the size of the groove width using the change characteristics of the arc voltage and welding current. The detected groove width G is input to one input terminal of the differential amplifier 24, and the designed groove width G ₀ is set in advance in the setting device 23.
The difference G-G ₀ =ΔG is provided to the rotation diameter controller 25. Rotating diameter controller 2
5 drives the motor 20 according to the difference ΔG to variably control the rotation diameter D.

The rotation diameter D is controlled as follows. It is assumed that the rotational diameter D is given in advance an initial value D ₀ corresponding to the designed groove width G ₀ (a rotational diameter that can form a proper weld bead when the groove width is G ₀ ).

If △G is negative, the detected groove width G is the designed groove width.
Since it is smaller than G ₀ (G<G ₀ ), the rotating diameter D ₀ is excessive. Therefore, the rotation diameter is made smaller in accordance with ΔG.

On the other hand, if △G is positive, the detected groove width G is larger than the designed groove width G ₀ (G>G ₀ ), so
The rotational diameter D ₀ is insufficient. Therefore, the rotation diameter is increased in accordance with ΔG.

In addition, if △G = 0, the design groove width G ₀ and the detected groove width G are equal (G = G ₀ ), and the rotating diameter D ₀ is appropriate, so welding is performed while maintaining this value. .
Regarding the groove tracing control that maintains the proper aiming position of the arc, for example, the applicant has
A well-known technique such as that proposed in No. 248571 may be used.

According to the high-speed rotating arc welding apparatus according to the present invention, a weld bead can be formed with an appropriate width according to the groove width by controlling as described above.

In the above embodiment, a rack and pinion mechanism driven by a motor is shown as an example of a driving means for vertically moving the upper fulcrum of the electrode, but the mechanism is not limited to this, and other mechanisms may also be used. good.

Further, the self-aligning bearing 8 that serves as the fulcrum of the electrode 1 may be replaced with a spherical bearing as in the above-mentioned prior art.

[Effects of the Invention] As described above, the present invention is provided with a drive means for moving the fulcrum of the electrode up and down, so that the rotational diameter of the arc can be varied even during welding. Therefore, there is an effect that variable control of the arc rotation diameter can be applied to form a weld bead with an appropriate width according to fluctuations in the groove width.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a welding device according to an embodiment of the present invention, FIG. 2 is a block diagram of a control circuit used in an embodiment of the present invention, and FIG. 3 is a diagram of a conventional high-speed rotating arc welding device. FIG. 2 is a schematic side view and a plan view of the rotation mechanism. In the figure, 18 is a rack, 19 is a pinion,
20 is a motor, 21 is a shaft of the motor 20, 2
2 is a groove detector, 23 is a setting device, 24 is a differential amplifier, 25 is a rotation diameter controller, and D is the rotation diameter of the arc. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. By supporting an electrode rotatably by a predetermined distance from the center of a disk that performs rotational movement, and by rotating the disk using the upper part of the electrode as a fulcrum. A high-speed rotary arc welding device for rotating an arc generated from the electrode in a circular motion, characterized in that the high-speed rotary arc welding device includes a drive means for vertically moving an upper fulcrum of the electrode. 2. The drive means is a rack drive driven by a motor.
The high-speed rotating arc welding apparatus according to claim 1, characterized in that it includes a pinion mechanism.