JP3248442B2 - Contact tips for welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact tip for welding used in a consumable electrode type arc welding torch.

[0002]

2. Description of the Related Art Welding contact tips (hereinafter referred to as tips) have two major roles. The first is a role of a guide for guiding a consumable electrode (hereinafter, referred to as a wire) to a welding location, and the second is a role of a contact for energizing the wire.

In a general chip, the shape of the guide hole 1 is circular, and its diameter is set to be larger by about 0.1 to 0.2 mm than the diameter of the wire. This is to prevent foreign matter adhering to the wire or chips generated by the chips from being caught between the guide hole and the wire, preventing the smooth feeding of the wire or preventing the wire from being energized.

[0004] In the prior art, Japanese Patent Laid-Open Publication No.
As shown in Japanese Patent Application Laid-Open Publication No. H11-260, there has been a configuration in which a guide hole is formed by spirally winding a flat plate in order to smoothly discharge foreign matter.

As disclosed in Japanese Patent Application Laid-Open No. Hei 6-304761, a guide hole has a non-circular cross-sectional shape such as a triangle, and a gap between a guide hole and a wire is reduced while a gap through which a foreign substance passes is increased. there were.

Further, as disclosed in Japanese Patent Publication No. 5-38674, a presser is pressed against a wire by a spring through a hole formed in a side surface of the chip, thereby ensuring energization of the wire. Further, as disclosed in Japanese Patent Application Laid-Open No. 7-100653, a vertical slot is formed at the tip of the chip body, and a spring is attached so as to tighten the vertical slot and the wire.

Further, as shown in Japanese Utility Model Application Laid-Open No. 6-48968, vertical slits are formed in four directions, and the tips of the chips are tightened in advance to reduce the size of the guide holes.

[0008]

As described above, the conventional chip has the following three disadvantages. First, since the guide hole is large compared to the wire diameter, the degree of freedom of the wire at the tip of the tip is large and the aiming accuracy of the welding location is poor. Second, since the guide hole is larger than the wire diameter and is circular in shape, the point of contact at which the wire comes into contact with the wire is a single point on the circumference. Thirdly, it is not possible to cope with a foreign substance having a diameter of about 0.1 to 0.2 mm or more between the guide hole and the wire. Although some of these drawbacks have been improved in the past, none of these drawbacks has been eliminated. SUMMARY OF THE INVENTION An object of the present invention is to provide a welding contact tip which has solved all of the conventional disadvantages.

[0009]

In order to achieve this object, according to the present invention, a chip body is divided into a plurality of equal parts along an axial direction of a guide hole, and a spiral groove is formed on an inner surface of the guide hole. In order to integrally fix the plurality of divided parts and the divided parts, a fixing ring for fixing the threaded base of each divided part and a slit gap formed between the divided parts at the tip end of the chip are tightened. And a fastening ring elastically attached to the tip of the tip as described above.

[0010]

According to the above construction, foreign matter between the guide hole of the chip body and the wire enters the spiral groove, the foreign matter is easily discharged, and the tightening ring is attached to the tip end of each divided portion. Since it is elastically attached to the outer periphery of the part, the wire press-fitted into the chip makes line contact with the entire circumference of the guide hole, and stable current can be obtained. It has the effect of improving the aiming accuracy for objects.

An embodiment of the present invention will be described below with reference to FIGS. 1 is a guide hole into which a wire (not shown) is press-fitted.
A plurality of spiral grooves formed on the inner surface of the chip, 4 is a slit gap, 5 is a fixing ring for fixing the screw-side base of the divided portion, and 6 is a fastening ring elastically attached to the outer periphery of the tip end of the chip. It is.

In the chip of the present embodiment, a guide hole 1 for feeding a wire is formed by fixing the divided portion 2 with a fixing ring 5. And the ring for tightening 6
Is tightened to a slit gap 4 of about 0.1 mm at the tip of the tip, so that the diameter of the guide hole 1 is smaller than the diameter of the wire by about -0.1 mm. For this reason, when the wire is press-fitted into the guide hole 1, the diameter of the wire is larger, so that the tightening ring 6 is opened according to the wire diameter, and the wire is brought into contact with and held around the entire circumference of the guide hole 1. The difference between the diameter of the guide hole 1 and the wire at the time of wire press-fitting is approximately 0.0 mm, and the contact between the guide hole 1 and the wire is the entire circumference of the guide hole 1 so that the tip of the chip is in line contact and stable. Power can be obtained. Furthermore, since the degree of freedom of the wire at the tip of the chip is also zero, aiming accuracy is improved.

Since the dividing portion 2 is provided with a plurality of spiral grooves 3, foreign matter between the guide hole 1 and the wire enters the spiral grooves 3. The spiral inclination θ of the spiral groove 3 is 0 <θ ≦ 15 ° with respect to the axial direction, and the groove width is the diameter L of the guide hole 1.
L / 2 to L / 4. As a specific example, in the case of a chip having a wire diameter of 1.2 mm, the size of the spiral groove is □ 0.6 to □ 0.3 mm. Also, the spiral inclination θ =
When the angle is 0 °, the spiral is not formed, and the discharge of the foreign matter cannot be performed over the entire circumference. If the groove depth and groove width are L / 2 or more, the guide hole 1
If the contact is smaller than L / 4, it is not possible to secure a sufficient size for discharging foreign matter. Due to the spiral groove 3, clogging of the guide hole 1 by foreign matter is prevented in the entire circumference of the guide hole 1, and the wire can be fed while the entire circumference of the guide hole 1 is in close contact with the wire.

Further, providing the spiral groove 3 in the guide hole 1 is expensive in the state where the guide hole 1 is integrally formed, but in this embodiment, the chip is divided in the axial direction of the guide hole 1. Thus, the spiral groove 3 can be easily formed in the guide hole 1. The number of spiral grooves 3 is the same as the number of divisions. As a result, the shape of each divided portion 2 becomes the same, and low-cost processing becomes possible.

[0015]

According to the present invention, the chip body is divided into a plurality of equal parts along the axial direction of the guide hole, and a plurality of divided portions each having a spiral groove formed on the inner surface of the guide hole; In order to fix the divided parts integrally, it was elastically attached to the tip of the chip so as to tighten the fixing ring that fixes the threaded side base of each divided part and the slit gap formed between the divided parts of the tip of the chip. With a tightening ring, the play of the wire at the tip of the tip is eliminated, the aiming accuracy of the wire can be improved, the current can be supplied well, and foreign substances can be released by the spiral groove and the wire can be smoothly fed. It has excellent effects such as not disturbing the feeding.

[Brief description of the drawings]

FIG. 1 is a perspective view of a welding contact tip according to an embodiment of the present invention.

2A is a perspective view of a dividing part. FIG. 2B is a perspective view of a dividing part. FIG. 2C is a perspective view of a dividing part.

FIG. 3 is an enlarged perspective view of a tip portion of the chip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide hole 2 Division part 3 Spiral groove 4 Slit gap 5 Fixing ring 6 Tightening ring

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Kiso 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-52-147533 (JP, A) JP-A-63- 40625 (JP, A) Jiko Hira 3-2383 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 9/26

Claims (1)

(57) [Claims] 1. A welding contact chip having a guide hole through which a consumable electrode in a center portion passes, wherein a tip body is divided into a plurality of equal parts along an axial direction of the guide hole, and a spiral is formed on an inner surface of the guide hole. A plurality of divided portions having a groove shape, a fixing ring for fixing the threaded side base of each divided portion to integrally fix each divided portion, and a formed portion between each divided portion of the tip end portion Welding tip having a fastening ring elastically attached to the tip of the tip so as to tighten the formed slit gap.