JPS5918151B2 - welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for narrow gap inert gas metal arc 30 welding.

Inert gas metal arc welding is known as a method for making high-quality welded connections with few defects, but when welding plate materials, the nozzle is opened to supply inert gas (inert gas) to the welding area35. The size of the welding nozzle is larger than that of the tip, and the movement of the welding nozzle is restricted, making it difficult to weld together materials with a certain thickness.

For this reason, welding wire (also called wire or welding core wire) is produced without welding (swinging) the welding nozzle.

), the bottom surface of the groove was alternately welded on one side at a time, but since the arc did not oscillate, poor penetration occurred and defects were likely to occur. In addition, attempts have been made to pass the wire through a roller device equipped with a large number of rollers and rotate the entire wire to give the wire a bending edge, but the wire feeding is unstable and the welding direction cannot be adjusted due to the rotation of the wire ends. - On the contrary, problems such as unsmooth weeping due to spatter adhering to the tip of the wire occur. In order to solve this problem, the inventor first supplied a welding wire 1 from a direction parallel to the axis of the feed roller, as shown in FIG. 1, and drove a swinging member 2 having an arcuate wire passage. The welding wire 1 is oscillated by the device 3 and the feeding direction is changed by 90 degrees and fed to the feed roller 4 to give the welding wire 1 a wave-shaped deformation. It was proposed to supply it to (.) 5, which would be the nozzle.

In this way, the end 6 of the corrugated welding wire 1 (hereinafter referred to as wire 1) moves back and forth within the groove (left and right in the welding direction in the drawing) to form a stable arc and narrow the gap. First, an arc trajectory 7 as shown in FIG. 3 is created to form a good weld bead. However, in this method, the related equipment from the welding wire supply reel (not shown in Figure 1) to the supply roller 4 is large-sized, and in addition, a gas sealing device for the welding part is installed, so the wire supply side It becomes difficult to monitor welding conditions such as arcs and weld beads, and if you try to make it a portable device, it will be disadvantageous due to size restrictions, and it will be difficult to design a multi-electrode device. accompanied by.

The object of the present invention is to provide a welding method that has a function of swinging the arc within a narrow gap, facilitates monitoring of the welding area from the front or rear in the welding direction, and makes it possible to downsize the welding equipment. The purpose is to propose a device.

In short, this invention fixes the end of a conduit for feeding and supplying the wire, and passes the wire from the end of the conduit between the rollers of a pair of oscillating rollers and between the rollers of a pair of feeding rollers in order. It is characterized in that it is passed through to give wave-shaped plastic deformation to ensure wave-form formation before being supplied to the contact tube.

The structure of the apparatus according to the present invention will be explained with reference to FIGS. 4 to 7. FIG. 4 is a perspective view of the main parts of the device according to the invention. The wire 1 is pulled out from a welding wire reel 13 (hereinafter referred to as wire reel) via a conduit roll 14 by a welding wire supply roller 12 driven by an electric motor 10, and is drawn out into a conduit (conduit tube) forming an arbitrary curved path. (also referred to as) 8. The end 8a of this conduit is fixed to the frame 15 of the welding device. The wire 1 coming out of the end 8a of this conduit is carried by rollers 9a and 9b.
The opposing portions of a pair of feed rollers 4 are made up of rollers 4a and 4b that are attached to a frame 15 and driven by an electric motor 16. Opposing contacts 4c of rollers 4a and 4b (roller 4 in FIG.
It refers to one point on the line connecting a and the center of the mouth 4b. In a practical device, this is the intersection of the central axis of the wire 1 passing through a shallow groove provided at one position of the roller thickness and a line connecting the centers of the rollers 4a and 4b in FIG. ) is located on an extension of the central axis of the wire passage of the contact tube 5 surrounded by the inert gas seal device 11. Roller 9 of swinging roller 9
a, 9b are side surfaces 17a of the gear case 17 that pass through the opposing contact 4c of the feed roller 4 and are connected to the frame 15;
It is attached to a swing frame 18 that reciprocates around a line perpendicular to the axis of the shaft 20, that is, the axis of the shaft 20.

The rollers 9a and 9b are mounted so that they can freely rotate as the wire moves. The swing frame 18 is rotated via a shaft 20 by a link mechanism 19 consisting of a drive disk 19a, an arm 19b, and an arm 19c. This link mechanism is an example of a rotating means, and may be any cam mechanism or other mechanism that provides reciprocating rotational movement to the swing frame 18 and is simple and small. Further, the distance between the opposing contact point 9c of the swinging roller 9 (one point of the distance connecting the axes of the swinging rollers 9a and 9b) and the opposing contact point 4c of the feed roller 4 is set to approximately the same distance as the outer circumference of the roller 4a. shall be.

The outer diameters of the rollers 4a and 4b are usually the same.
Further, the rollers 9a and 9b are also rollers having the same diameter. The rollers 4a, 4b and the rollers 9a, 9b are also usually of the same diameter. By doing this, the bending deformation along the roller 9b at the position of the swinging roller 9 shown by the solid line in FIG. Just at the position where the wire is bent along the roller 4b, the wire is bent a second time in the same direction along the outer periphery of the roller 4b, making the plastic deformation of the wire even more effective.

Regarding the effect of bending deformation of the wire, since the feeding roller 4 is driven by a motor, the bending effect of the feeding roller 4 is greater than that of the swinging roller 9. The passage width W of the passage 21 in the contact tube is smaller than the amplitude of the waveform of the wire, and the wire is deformed within the elastic limit, so when the wire extends from the tube end 5 of the contact tube 5, it is opened. It sufficiently extends toward the front side wall 22 and maintains the necessary arc in close proximity, and this arc reciprocates within the narrow gap due to the waveform of the wire to form a high quality weld bead in the narrow gap. can do. Furthermore, since the link mechanism has a drive disk 19a that rotates, the angular velocity of the swing frame 18 at the positions of the swing rollers 9 and 9' in FIG. Become something.

By making the dimension between the opposing contacts 4c and 9c approximately equal to the outer circumference of the roller 4a, the rotational speed (Rpm) of the roller 4a and the number of reciprocating rotations per minute of the swing frame 18 are determined. , (Number of reciprocating movements.

The rotational speed of the oscillating disk 19a and the rotational speed of the roller 4a, which must be made equal in frequency or period in terms of the waveform, can be easily obtained by combining the driving gears in the gear frame 17. Further, when the opposing contact 9c of the swinging roller 9, the end 8a of the conduit, and the opposing contact 4c of the feeding roller 4 are in line, the end 8 of the conduit
a and the opposing contact 9c are closest to each other, and this is the farthest position in terms of the swinging roller positions 9 and 9' shown in FIG. The length of the wire between 8a and the opposing contact 9c will fluctuate periodically, which is unfavorable for device operation and wire feeding.
Therefore, the electric motor 10 that drives the welding wire supply roller 12
By using an electric motor with a constant torque characteristic so that the load applied to the feed roller 4 does not fluctuate, the wire is fed from the feed roller 4 at a constant speed, which contributes to improving the quality of the welded part.

In addition, when increasing the swing angle α in order to increase the wave height (large waveform amplitude) of the wire fed into the contact tube 5 without replacing the rollers 4a and 4b, the end of the wire 1 is arc-shaped. It is possible to make the time for the groove to remain close to both side walls of the groove while forming a relatively long time. This can be facilitated by changing the connection position of the arms 19c and changing the length of the arms 19c. Further, by changing the swinging speed using a cam mechanism, the waveform formed by plastic deformation of the wire can be changed, and the same effect as the above-mentioned swinging angle change can be achieved. By carrying out this invention, a device for plastically deforming a wire to form a wave shape can be miniaturized and its handling becomes easy.
The design of the portable equipment is simplified, the monitoring of the weld zone is facilitated, and the use of a constant torque motor to drive the welding wire supply roll stabilizes the wire feed speed of the feed roller, eliminating oscillation. Various effects are achieved, such as the angle or swinging speed being easily changed, the waveform of the wire being easily changing, and the suitable waveform ensuring sufficient proximity of the groove sidewall of the wire end.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the structure of a conventional wire feeding device, Fig. 2 is a cross-sectional view of the contact tube portion, Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2, and Fig. 4 is an embodiment of the present invention. FIG. 5 is a partial cross-sectional view illustrating the relationship between the feed roller, swing roller, conduit end and contact tube according to the present invention, and FIG. 6 is a perspective view of the swing frame 18.
-B sectional view, and FIG. 7 is a view taken along the line CC in FIG. 6 for explaining the link mechanism that drives the swing frame. 1... Wire (welding wire), 4... Feeding roller, 4a, 4b... Roller, 4c...
... Opposed contact, 5... Contact tube,
6... Wire end, 8... Conduit, 8a
...... end of conduit, 9... rocking roller,
9a, 9b...roller, 9c...opposed contact, 10...drive motor for welding wire supply roller, 11...inert gas supply device, 13...
...Wire reel, 14...Tasamasa roller,
15...Frame, 16...Electric motor,
17... Gear case, 18... Rocking frame, 19... Link mechanism, 19a...
... Drive disk, 19b, 19c... Arm,
20...view.

Claims (1)

[Claims] 1. While giving the welding wire a wave-shaped plastic deformation, the welding wire is continuously fed into the contact tube, and the welding wire tip exiting the contact tube reciprocates between the walls of the welding groove to perform welding. In the welding device, an end of a conduit whose end is fixed at a fixed position for feeding and supplying the welding wire, a pair of oscillating rollers that apply a first deformation to the wire along the outer periphery of the roller, and a first deformation along the outer periphery of the roller. A pair of feed rollers and a contact tube that provide deformation of 2 are arranged in order in the welding wire supply direction, and when the swing roller is located at one swing end, the swing roller opposing contact point and the feed roller The swinging is performed such that the distance between the swinging roller and the feeding roller is equal to the distance between the swinging roller and the feeding roller when the swinging roller is located at the other swinging end. a roller and a feed roller, and the feed roller is arranged such that the weld line is fed approximately the distance while the swing roller moves from one swing end to the other swing end. A welding device characterized by comprising: 2. The welding apparatus according to claim 1, wherein the swinging roller is configured to swing around an axis including the pair of feed roller contacts. 3. The distance between the opposing contacts of the feed roller and the opposing contacts of the swinging roller is set to approximately 1/2 of the outer circumference of the feed roller, and the number of revolutions of the feed roller per minute and the swinging reciprocation of the swinging roller are 2. The welding device according to claim 1, wherein the number of times of welding is made equal to each other. 4. The welding device according to claim 1 or 3, wherein the welding wire supply roller located between the welding wire reel and the conduit is driven by an electric motor with constant torque characteristics. 5. The welding device according to any one of claims 1 to 4, characterized in that the waveform of the plastically deformed welding wire is changed by controlling changes in the angular velocity of the swinging roller. 6. The welding device according to any one of claims 1 to 4, characterized in that the wave height of the waveform of the plastically deformed welding wire is changed by changing the swinging angle of the swinging roller. 7. The welding device according to any one of claims 1 to 6, characterized in that the outer diameter of the feeding roller and the outer diameter of the swinging roller are made the same to give wave-shaped plastic deformation to the welding wire.