JPH01181942A - Manufacture of contact chip for welding - Google Patents

Abstract

PURPOSE:To reduce the material cost and to improve the working efficiency by dividing a core part and chip main body part, inserting the hard wire feeding a welding current to a consumable electrode into the core part and press-fitting the core part and chip main body part by a die from the outer periphery of the chip main body part. CONSTITUTION:A core part 1 is inserted to a chip main body part 2 and the hard wire having the outer diameter equiv. to the inner diameter for feeding welding current to a wire 4 is inserted to the core part 1. The pressure fitting is executed by the working of forming the hole of the inner diameter for feeding a welding current to the wire through hole 3 by executing the spreading of a chip blank stock with giving impact pressurizing on the chip blank stock by the die having a conical forming part from the outer periphery of the chip main body part 2. This core part 1 is taken as the hard conductive metal having excellent heat and wear resistances and the chip main body 2 is composed of a soft conductive metal, hence the material cost of the whole chip is remarkably curtailed. The working efficiency of chip external shape working, etc., is improved and the service life of the working tool of a bit, roller, etc., can thus be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a welding contact tip for use in a consumable electrode type arc welding torch.

BACKGROUND OF THE INVENTION FIG. 4 shows an example of a conventional welding contact tip (hereinafter simply referred to as a tip). The tip 5 serves as a guide for supplying a consumable electrode (hereinafter simply referred to as a wire) to the welding part through a wire passage hole 3 provided at its center, and as a power supply for supplying welding current to the wire.

The chip 5 performs contact power supply to the wire, and when power is supplied, the contact part of the wire does not reach a high temperature, and the wire passage hole 3 is significantly worn due to the feeding of the wire, and depending on the state of wear, the wire may be damaged. It will no longer be able to fulfill its role of feeding power to the guides and wires.

For this reason, conventional tips were made entirely of chromium copper, which has excellent wear resistance at high temperatures.

Problems to be Solved by the Invention However, such conventional chips are made entirely of expensive ROM copper, resulting in extremely high material costs.
There were also some problems in processing.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to functionally divide the chip into two parts, a core part and a chip body part, and to connect the consumable electrodes in the core part. A hard wire having an outer diameter corresponding to the inner diameter for supplying welding current is inserted, and the contact tip material is stretched and pressurized from the outer periphery of the contact tip body using a die to form a consumable current standard hole, and This is a method in which the core part and the contact tip part are pressed together.

action The effect of this technical means is as follows.

The minimum part (core part) of the consumable electrode hole, which serves as the wire guide and welding current feeding point, is made of hard conductive 5-vane metal that is solid and has excellent heat resistance and wear resistance. By constructing the main body from an inexpensive soft conductive metal, most of the chip is made up of the chip main body, so the material cost of the entire chip can be significantly reduced.

Example FIG. 1 shows an embodiment according to the present invention.

In FIG. 1(a-), 1 indicates a core portion, and 2 indicates a chip body. The core part 1 is wound into a coil, and the wire diameter of the coil is 0.1#1111~2 is effective, Q, 57
1jl11~1.2cm is the most practical. Q, 1fl
Below, the effect of the core part 1 will be significantly weakened, and if it exceeds 2a, it will be difficult to process the coil, and the cost advantage will be reduced. As for the winding pitch, a wire diameter ratio of 1 (close winding) to 2 times (loose winding) is effective. If it exceeds twice, the fixing of the coil becomes unstable, the power supply to the wire 4 becomes unstable, and the stability of the welding current deteriorates. At this time, the leading end of the tip, which is particularly worn, may be tightly wound, and the rear portion may be loosely wound.

In this embodiment, as a method for joining the core part 1 and the chip body part 2, the core part 1 is inserted 6t\-/ into the chip body part 2, and the welding current to the wire 4 is applied to the core part 1. A hard wire with an outer diameter corresponding to the inner diameter of the power supply reservoir is inserted, and a die having a conical forming part is used to extend and press the chip material while applying impact pressure to the chip material from the outer periphery of the chip body. A mechanical connector is used which is press-fitted by a process (hereinafter referred to as swaging process) to form a hole with the same inner diameter as the wire through-hole 3 through which welding current is fed. In addition, other mechanical joining methods (coil screwing, etc.) are also available as joining methods.

(caulking, etc.), chemical bonding, or metallic bonding. Figure 1)) shows a cross-sectional view after the swaging process.

At this time, the length of the coil (core part) is a part of the tip end (20u in the example) or the first
The entire length of the chip may be used as shown in Figure (C).

In the case of pressure welding by swaging process, the chip body part 2 is embedded in the gap between each pitch of the chip body part 2 and the coil (core part 1) during the swaging process, as shown in Fig. 1 Φ). The core part 1 is fixed by pressure welding, and when feeding the wire, the core part 1 does not move in the axial direction (without being pushed out), and even at large currents, almost no heat is generated at the pressure welding part. unacceptable.

However, in order to increase the fundamental bond between the core part 1 and the chip body part 2, there is a structure in which the tip of the chip body part 2 is bent inward, or a structure in which the tip of the chip body part 2 is bent inward, or A non-uniform portion (an uneven portion, a knurling portion, etc.) may be provided on one or both of the portions.

In the chip 5, the part that serves as the guide part of the wire 4 and the feeding point of the welding current to the wire 4 is the thin layer part of the inner wall of the wire through hole 3, so this important thin part is used as the core part 1. By configuring this with a hard conductive metal and the remaining part (chip body 2) with an economical soft conductive metal, the life of the chip 5 is almost the same as that of conventional products, and it is not difficult to process. Easy and inexpensive chips can be supplied to the market.

Next, FIG. 2 shows another embodiment of the present invention.

In this embodiment, the core portion 1 of the previous embodiment is changed from a coil-shaped core portion to a pipe with holes machined into a solid round rod.

The length of the pipe and the solid round bar may be the tip end of the tip (20 mm in the embodiment) as shown in FIG. 2(a), or the entire length of the tip as shown in FIG. It is effective to have a wall thickness of 4 fl to 2 mm for the pipe and the solid end rod with holes drilled therein.

The joining means was the same as in the previous example, and the effect was equivalent to that in the previous example.

Next, FIG. 3 shows still another embodiment of the present invention.

In this embodiment, the cross-sectional shape of the core portion 1 is T-shaped. In Figure 3 (&), 1 is a T-shaped core part, 2
indicates the chip body. In the figure, it is effective to set the length of (&) to one stroke or more, and the most practical is 2 to 1 rsmm. Further, the length of the fitting portion ((5) is preferably 2 mm or more from the viewpoint of mechanical fitting, and may be the entire length of the chip as shown in FIG. 3).

The joining means was the same as in the previous example, and the effect was equivalent to that in the previous example.

9 pairs Effect of the invention As described above, according to the present invention, the following effects can be achieved.

(1) By configuring the chip with a core part (hard conductive metal) and a chip body part (economical soft conductive metal), the material cost is reduced with the same performance and life as conventional ones.
It becomes lli.

r2) Since the chip main body is made of a soft conductive metal, work efficiency such as processing the chip external shape can be improved.

Furthermore, the life of processing tools such as cutting tools and rolling rollers is extended.

(3) By making the core part into a coil shape, drilling holes in chromium copper or the like using a drill can be omitted.

This eliminates maintenance due to breakage of the drill, etc., and improves work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a chip showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of a chip showing another embodiment of the present invention, and FIG. 4 is a sectional view of a conventional chip. 10 pieces - 7 1... Core part, 2... Chip body part, 3
...Wire hole, 4...Wire, 5 ・
...Contact tip.

Claims (8)

[Claims] (1) In the method of manufacturing a welding contact tip, which is composed of two parts: a core part that contacts the consumable electrode, and the remaining part of the contact tip main body, and which has a through hole for the consumable electrode in the center, the core part Insert a hard wire with an outer diameter equivalent to the inner diameter to supply welding current to the consumable electrode, and use a die to stretch and press the contact tip material from the outer periphery of the contact tip body to open the consumable electrode hole. 1. A method for manufacturing a welding contact tip, comprising forming a core portion and a contact tip body portion under pressure. (2) The method for manufacturing a welding contact tip according to claim 1, wherein the core portion is formed of a coil. (3) The method for manufacturing a welding contact tip according to claim 1, wherein the core portion is formed of a pipe or a solid round bar with holes drilled therein. (4) A welding contact tip according to claim 1, characterized in that an inhomogeneous portion is provided on either or both of the inner surface of the contact tip main body and the outer surface of the core portion. manufacturing method. (5) The method for manufacturing a welding contact tip according to claim 1, wherein the tip of the contact tip main body is bent inward to form a structure that prevents the core from coming off in the axial direction. (6) The method for manufacturing a welding contact tip according to claim 1, wherein the core portion has a T-shaped cross section that fits into the contact tip body. (7) The method for manufacturing a welding contact tip according to claim 1, wherein the axial length of the core portion is the entire length of the contact tip. (8) The method for manufacturing a welding contact tip according to claim 1, wherein the axial length of the core portion is at least 2 mm or more longer than the tip end of the contact tip.