JPH0647173B2 - Wire feeding method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire feeding method suitable for use in a wire feeding path such as a welding robot or an automatic welding device that performs welding using a consumable welding wire. It is a thing.

2. Description of the Related Art Conventional technology and its problems In general, a conduit cable having a wire guide (liner spring) inside is used for a wire feeding path of a welding robot, an automatic welding device, or the like. [Hereinafter, all "wire guides" and display parts mean "wire guides (liner springs)", but in the text, they are simply referred to as "wire guides". For example, as shown in FIG. 1, the welding wire 2 pulled out from the pail can 1 is fed to the tip of the welding torch 5 of the welding robot 4 by the wire feeding motor 3, but the wire feeding is performed. This is the case with the conduit cable shown at 6 provided in the path. As shown in FIG. 5 and FIG. 6, the conduit cable 6 has a rubber sheath 7 and a wire guide 8 mounted therein. Further, as the wire guide 8, generally, a spiral steel wire or the like is used. Further, bag nuts 9 are provided at both ends of the conduit cable 6. The bag nut 9 is pressure-bonded to the wire guide 8 together with the reinforcing material 11 by the connecting metal fitting 10 while supporting the rubber sheath 7.

The conduit cable 6 constructed in this manner is connected to the terminal 12 of the wire outlet of the pail can 1 by the bag nuts 9 at both ends thereof, as shown in the drawing, and the other is appropriately connected to the wire feeding motor 3 Although not shown, it is connected to a similar terminal. Reference numeral 13 is a cable supporter for making the curvature of the conduit cable 6 gentle.

By the way, in the use state of the conduit cable 6, both ends thereof are supported at fixed positions, and the end portions are supported by the cable supporter 13 as shown in FIG. 5, and in the middle thereof, as shown in FIG. It is supported by 14, etc. Therefore, the conduit cable 6 always has a curved portion in the same state in the length direction, and maintains a constant orientation in the circumferential direction with respect to the axial center. This means that the abutting surface of the welding wire 2 that is pulled by the feeding roll 3a of the wire feeding motor 3 and moves in sliding contact with the inside of the wire guide 8 to the wire guide 8 is always a fixed part. For example, as shown in FIG. 7, the convex curved portion 6a of the conduit cable 6 is in sliding contact with the lower portion of the wire guide 8 in the figure, and the concave curved portion 6b is in sliding contact with the upper portion of the drawing. Therefore,
Only the same portion of the wire guide 8 is worn, and the welding wire 2 is fed in such a state as to bite into the wire guide 8 and the contact resistance is further increased.
Will be sent while being scraped.

As described above, the conventional technique has a serious problem in achieving the intended purpose of stably feeding the welding wire for a long period of time.

OBJECT OF THE INVENTION The present invention provides a wire guide in a conduit cable,
With the conduit cable, or with the wire guide only, rotate the wire guide with respect to the shaft center at appropriate times with the passage of welding time, that is, when the wire guide wears to such an extent that the stability of wire feeding is impaired. A method of feeding the welding wire by shifting the contact surface of the welding wire with the wire guide, extending the life of the wire guide as a whole, and feeding the welding wire for a long time. The present invention provides a wire feeding method which is designed to be excellent.

Embodiment of the Invention FIGS. 2 to 4 show an embodiment of the present invention, the gist of which is to provide a rotating mechanism in a conduit cable, which is used to impart rotation to the conduit cable in a timely manner. However, the welding wire is smoothly fed. In FIG. 2 and FIG. 3, reference numeral 21 is a conduit cable used in the present invention, in which the tip of a connecting metal fitting 23 connected to one bag nut 22 is extended, and a wire insertion passage 24 is formed in the extended portion. Has been done. Further, the main gear 25 is fixed to the tip thereof. Other structures are similar to those of the conventional example. On the other hand, the terminal 26 has a threaded portion 27 that is screwed into the bag nut 22, a circular hole 28 into which the tip of the connecting fitting 23 to which the main gear 25 is fixed can be inserted, a wire insertion hole 29, and the main gear 25. A support bracket 32 for supporting the meshing operation gear 30 via a support shaft 31 thereof, a window hole 33 for meshing the operation gear 30 with the main gear 25, and the like are provided. The operation gear 30 is rotatably attached to the support bracket 32 by a support shaft 31, and a plurality of counterbores 34 are provided on the same circumference of the upper surface of the operation gear 30. The support bracket 32 is provided with a through hole 35 having a threaded portion, and a sphere 36 that engages with the counterbore 34 of the operation gear 30 and a spring 37 that presses the sphere 36.
Are set in the through holes 35 by screws 38.
Therefore, when the conduit cable 21 is fastened to and supported by the screw portion 27 of the terminal 26 by the bag nut 22, the main gear 25 meshes with the operation gear 30, and the operation gear 30 is rotated to rotate the main gear 25. As a result, the conduit cable 21 is also displaced in the circumferential direction with respect to its axis. At this time, the spot facing 34 provided on the operation gear 30
Needless to say, the sphere 36 provided on the support bracket 32 is locked, but by appropriately providing a plurality of spot facings 34, the corresponding number of conduit cables 2 can be provided.
1 can be displaced in its circumferential direction.

The turning mechanism of the conduit cable 21 has been described only at one end thereof, but the same mechanism may be provided at both ends. In some cases, as described below, only the wire guide in the conduit cable may be rotated.

The welding torch 5 shown in FIG. 1 is often manufactured as an integrated unit of the torch head 5a and the conduit cable 5b. FIG. 4 is for carrying out the present invention in such a case. In this example, 4
The reference numerals of 1 or less are given and the description will be sequentially performed. The torch adapter 42 is provided in the conduit cable 41, and the wire guide 4 is guided through the guide hole 43 of the torch adapter 42.
4 is inserted. The wire guide 44 is composed of a guide spring 45 and a cap 46 at its end, and a main gear 47 is fixed to the tip of the guide. The wire guide 44 is provided up to the tip of the torch head, and is fitted and locked in the guide hole 43 of the torch adapter 42 by the mouthpiece 46. On the other hand, the wire feeder 3 has a bracket 48 for receiving the welding torch.
Is provided. The bracket 48 has an engagement hole 49 for receiving the welding torch by the torch adapter 42 and a split groove 51 for tightening and supporting the welding torch with a bolt 50.
Further, a notch 53 for mounting the operation gear 52, which will be described later, and an attachment portion 54 that also supports the operation gear 52 are provided. The operation gear 52 is rotatably attached to the attachment portion 54 via the support shaft 55 at the position of the notch 53.
In addition, FIG.
Although not shown, the counterbore described in FIG. 3 and the balls, springs, and the like engaging with the counterbore are provided in the same manner.

Therefore, in the description of FIGS. 2 and 3, the operation of the operation gear 30 causes the wire guide 8 to move to the conduit cable 21.
However, in this case, by rotating the operation gear 52, only the wire guide 44 is rotated and displaced in the circumferential direction.

As described above, according to the present invention, the wire guide in the wire feeding path is provided with a mechanism capable of imparting rotation, and the wire guide is displaced in the circumferential direction thereof at a proper time with the welding time. It is a wire feeding method in which the wire for feeding is fed, and the operation gears 30 and 52 may be rotated by the output of the motor, or the feeding amount of the wire is measured to obtain a constant feeding amount. When reaching, the operation gears 30 and 52 may be rotated by some means.

Advantageous Effects of Invention The wire feeding method of the present invention imparts rotation to the wire guide of the wire feeding path at a proper time with the passage of welding time,
The sliding contact surface of the wire guide with which the welding wire abuts is changed, and this has the same effect as replacing the wire guide with a new wire guide each time rotation is applied. This is a wire feeding method in which the life is totally extended and the feeding ability of the welding wire is made stable over a long period of time, and exhibits an unprecedented excellent effect.

[Brief description of drawings]

FIG. 1 is an embodiment of an apparatus using the method of the present invention. FIG. 2 is a perspective view of a first device to which the present invention can be applied. FIG. 3 is a sectional view of FIG. FIG. 4 is a perspective view of a second device to which the present invention can be applied.
FIG. 5 is a perspective view of an apparatus for performing the conventional method. FIG. 6 is a sectional view of FIG. FIG. 7 is an explanatory view showing the feeding state of the welding wire. Conduit cable …… 21,41, wire guide ……
8,44, main gear ... 25,47, operating gear ... 30,
52

Claims (1)

[Claims] 1. A wire guide in a conduit cable for guiding a welding wire provided in a wire feeding path is imparted with rotation about its axis at a proper time with the passage of welding time. A wire feeding method characterized in that a welding wire that slides in a guide is displaced to feed the welding wire.