JPS6123068B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for supplying welding wire to a welding device.

Welding, especially 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 used to supply inert gas (inert gas) to the welding area. Since the welding nozzle is larger than the previous one, the movement of the welding nozzle is restricted, making it difficult to weld together materials with a certain thickness or more.

For this reason, a method was adopted in which the welding wire (also referred to as wire or weld core wire) is given a bending pattern and the bottom surface of the groove is alternately welded on one side at a time (batttel method) without weaving (swinging) the welding nozzle. However, since the arc does not oscillate, poor penetration occurs and defects are likely to occur. In addition, a method (loop-nup method) was attempted in which the wire was passed through a roller device equipped with a large number of rollers and the entire device was rotated to give the wire bends (loop-nap method), but the wire feeding was unstable and the welding progressed due to the rotation of the wire ends. The direction is irreversible, causing problems such as uneven carving due to spatter adhering to the tip of the wire.

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, giving the welding wire 1 a wave-shaped deformation. It was proposed to supply it to 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, experimental results show that avoiding a 90 degree change in direction of the wire through the arc-shaped wire passage makes the flow of the wire 1 more stable, and making the fan-shaped swinging member 2 reciprocate It is better to avoid it if possible than to have a certain weight and inertial force.

In this invention, the wire is entirely supplied by rollers, and a pair of rollers are rotated back and forth to form a wave-shaped wire, which is then supplied to the contact tube so that the wire has a stable and smooth flow, resulting in a good narrow opening. The purpose of this paper is to propose a method and device for pre-welding.

In short, the present invention is a method and apparatus in which a pair of supply rollers are attached to a frame, and the frame is rotated reciprocatingly around a support shaft to form a wire into a wave shape and then supply the wire to a contact tube. It is characterized by

This invention will be explained below with reference to the drawings. In FIG. 4, the wire 1 is fed between the opposing rotating surfaces of a pair of feed rollers 9 from a device, such as a wire drum 8, that supplies preferably straight welding wire. Frame 11
The feed roller 9 is driven by a drive device, such as a reduction geared motor 10, etc. (the drive gear is not shown), and the wire 1 is fed downward in FIG. In the illustrated case, the rotating arm 1 is attached to a driving motor 12 such as a geared motor.
The frame 11 held on the holding shaft 15 by the mechanism of the links 14a, 14b, and 14c connected to the holding shaft 15 rotates back and forth. The wire 1 formed into a wave shape by this reciprocating rotation is moved to a set of delivery rollers 16
The end portion 6 is then fed into the contact tube 5 and rotates back and forth within the narrow gap to form a track 7 and a good bead. Frame 11
The reciprocating rotation of is not limited to the link mechanism shown in FIG. 4, but may be performed using a hydraulic cylinder, a pneumatic cylinder, or the like.

FIG. 6 shows an enlarged view of the feeding roller portion and the vicinity of the wire corrugation mechanism. Figure 5 is frame 1
1 is a drawing showing the structure of a bearing pedestal 17 and a holding shaft 15 of a frame 11 that freely hold the reciprocating rotation of the frame 11.

The pitch and height of the waveform of the wire 1 are determined by the diameter of the feed roller 9 and the angle α of the reciprocating rotation of the frame 11.The center of the holding shaft 15 and the link bolt hole 19 connecting the link 14c It is determined by the distance R (hereinafter referred to as swing arm length) between the center of the swing arm and the center of the swing arm. In this case, the feed roller 9 is replaced by the frame 11.
Can be exchanged with. On the other hand, the swing arm length R can be adjusted by positioning the piece 21 in the slot hole 20 provided in the frame 11 and adjusting it with the adjustment bolt 22. Therefore, the rotation angle adjusting device consists of the slot hole 20, the piece 21, and the adjusting bolt 22. In addition, a plurality of adjustment bolt holes (not shown) are provided in the frame 11, and the connection pins are replaced to change the connection position of the end of the link 14c, thereby adjusting the swing arm length R.
It is also possible to change stepwise.

By implementing this invention, it is no longer necessary to change the wire feeding direction by 90 degrees, and the wire feeding flow is all done by roller contact, which makes the wire flow smooth and significantly contributes to good welding. Moreover, it has various effects such as being able to easily change the pitch of the wire waveform and the height of the wave, thereby increasing work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional welding wire supply device, and Fig. 2 is a swinging member 2 for forming a wave shape on the wire.
3 is a front view of the part showing the swinging state of the wire, FIG. 3 is a cross-sectional view taken along line AA in FIG.
The figure is a front view showing the structure of the device according to the present invention;
FIG. 5 is a sectional view taken along line BB in FIG. 4, and FIG. 6 is an enlarged partial sectional view showing the reciprocating state of the frame and the relationship among the delivery roller, contact tube, and wire. 1...Wire (welding wire), 8...Wire drum, 9...Feeding roller, 10...Deceleration motor, 1
DESCRIPTION OF SYMBOLS 1... Frame, 12... Drive motor, 13... Rotating arm, 14a, 14b, 14c... Link, 15...
...Holding shaft, 16...Feeding roller, 20...Slot hole, 21...Block, 22...Adjustment bolt, R
...Swing arm length.

Claims (1)

[Claims] 1. A welding wire is passed between the opposing roller rotating surfaces of a pair of feed rollers that are mounted on a frame and driven, 2.
The frame is reciprocated about a line that includes the intersection of the two feed roller axes and the welding wire and is parallel to the feed roller axes as the axis to give the welding wire a wave-shaped deformation and send it out. A method for supplying a welding wire, the method comprising: supplying the welding wire to a contact tube by passing the welding wire through a set of delivery rollers. 2. A frame including a device for replenishing welding wire, a pair of feed rollers and a device for driving the feed rollers, a bearing mount that holds the frame so as to freely rotate back and forth, and a set of feed rollers; a rotational drive device for reciprocally rotating the frame, and a rotation axis of the frame having the pair of feed rollers, a line where the pair of feed rollers face each other and make contact, and a contact tube axis A welding wire supply device characterized in that the welding wire feeding device is formed such that the two are located in the same plane. 3. The welding wire supply device according to claim 2, wherein the rotation drive device includes a rotation angle adjustment device. 4. The welding wire supply device according to claim 2, wherein the rotation drive device is formed by a link mechanism using a geared motor as a power source.