JPH1034341A - Contact tip for welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce generation of spark between a wire and a wire hole by forming an opening in a part inside the welding wire hole, installing a spring in the opening and pressing the wire to the wire hole with the spring. SOLUTION: An opening 12 is formed along the welding wire hole 6 inside a contact tip 1. A leaf spring 13 is installed in the opening 12. With the front leg 14 of the leaf spring 13 buried in the contact tip 1, the rear leg 15 is inserted into the recessed part 16 communicating with the opening 12. The center projected part 17 of the leaf spring 13 is projected into the wire hole 6 and expanded in the opening 12. The center projected part 17 presses the welding wire 5 to the wall of the wire hole 6, energizing it. The wire 5 wound on a wire winding reel 9 is passed through the wire hole 6 by a wire feeding roll 11 and fed to the tip 3 on the welding side. Even if the wire 5 is curved, it is pressed by the leaf spring 13, so that the contact of the contact tip is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a contact tip provided at the tip of an electrode of a welding machine.

Conventionally, this type of contact tip is made of a single body integrally formed of copper or chromium copper, and has a mounting portion such as a screw thread for mounting to an electrode at one end and a conical welding tip at the other end. A welding wire hole drilled along the longitudinal axis for feeding the welding wire wound on the reel to the welding end.

In the above-mentioned conventional contact tip, when the welding wire is supplied to the welding side end through the welding wire hole and the welding is performed, the welding wire is wound on a reel, and the welding wire is provided on the welding wire. (Upward curvature), the welding wire is not positioned at the welding wire hole, the contact area between the welding wire and the welding side end of the contact tip becomes unstable, and the welding wire and the welding wire hole Sparks are generated between the holes, the surface of the welding wire hole becomes rough, the power supply rate is reduced, and burn-back (explosion sound of the electrode) and spatter (spattering film of the electrode) are easily generated. Similarly, when the surface of the welding wire hole is rough, the supply resistance of the welding wire becomes large, causing a shortage of supply, and poor welding occurs. Further, there is a disadvantage that the welding side end is worn, the contact area becomes unstable, and it is necessary to replace the chip at an early stage.

An object of the present invention is to reduce the occurrence of sparks between a welding wire and a hole of the welding wire, stabilize the power supply rate over a long period of time, and make the surface of the hole of the welding wire at the welding side end less likely to be roughened. Another object of the present invention is to provide a contact tip of a welding machine that can stabilize the supply of a welding wire, improve the life thereof, and reduce welding defects.

[0005] The contact tip of the welding machine according to the present invention forms an opening in an inner part along the welding wire hole,
The opening is provided with a spring for pressing the welding wire into the welding wire hole.

Next, an embodiment shown in the accompanying drawings of a contact tip of a welding machine according to the present invention will be described in detail.

In the figures, reference numeral 1 denotes a contact chip of the present invention formed by integrally molding copper or chromium copper,
The contact tip 1 is provided at one end with a mounting portion 2 for mounting to an electrode, at the other end a conical welding-side tip 3 is provided, a screw thread 4 is formed at the mounting portion 2, and the contact tip 1 is connected to the electrode. Screw connection.

The contact tip 1 has a welding wire hole 6 formed therein for feeding a welding wire 5 along a longitudinal axis, and the welding wire hole 6 has the same diameter in the contact tip 1. Although it is extended, it is formed as a large-diameter tapered hole 7 near the entrance end of the welding wire so that the welding wire 5 can be easily guided into the contact tip 1, and the welding wire is formed near the exit end of the welding wire. It is formed as a divergent tapered hole 8 so that the welding wire can be easily separated even if it is welded.
The welding wire 5 is wound around a wire take-up reel 9 as shown in FIG. 3, and the welding wire 5 passes through wire feed rollers 11, 11 which are driven to rotate by a wire feed motor 10, and the wire take-up reel 9. Is guided to the welding wire hole 6 from
The tapered hole 7 of the welding wire hole 6 is supplied to the divergent tapered hole 8.

A welding wire hole 6 is provided in the contact tip 1.
A leaf spring 13 is provided in the opening 12. The leaf spring 13 has a front leg 14 embedded in the contact chip 1 and a rear leg 15 communicating with the opening 12. And the central projection 17 of the leaf spring 13 extends from the welding wire hole 6 such that the central projection 17 projects into the welding wire hole 6. It is urged to press against the wall with a constant force.

In the contact tip 1 of the present invention, the welding wire 5 wound on the wire take-up reel 9 is driven by the wire feeding motor 10 to the welding side tip 3 through the welding wire hole 6 by the wire feeding roller 11. When supplying and performing the welding operation, the welding wire 5 is welded even if a camber of radius is provided by the winding wire 9 on the wire take-up reel 9, that is, even if a warp is attached to the welding wire. When the wire is fed along the wire hole 6, the central projection 17 of the leaf spring 13 presses the hole wall of the welding wire hole 6 at a constant pressure, so that the welding wire 5 is positioned in the welding wire hole 6 and welded. The contact area between the wire and the contact tip can be stabilized.

Since the present invention has the above-described configuration, the power supply rate can be stabilized over a long period of time, the welding wire can be supplied constantly, the life thereof can be improved, the number of chip replacements can be reduced, and welding defects can be reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view in the longitudinal direction of a contact tip of a welding machine according to the present invention.

FIG. 2 is a cross-sectional front view taken along the line AA of FIG.

FIG. 3 is a longitudinal sectional side view similar to FIG. 1 showing a use state of a contact tip of a welding machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact tip 2 Attachment part 3 Welding side tip part 4 Thread 5 Welding wire 6 Welding wire hole 7 Large diameter tapered hole 8 End divergent tapered hole 9 Wire take-up reel 10 Wire feed motor 11 Wire feed roller 12 Opening 13 Leaf spring 14 Front leg 15 Rear leg 16 Recess 17 Central projection

Claims (1)

[Claims] 1. A contact of a welding machine, wherein an opening is formed in a part of an inner side along a welding wire hole, and the opening is provided with a spring for pressing the welding wire into the welding wire hole. Chips.