JP2529326B2 - Manufacturing method of contact tip for welding - Google Patents

Description

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

2. Related Art FIG. 4 shows an example of a conventional welding contact tip (hereinafter simply referred to as a tip). The chip 5 serves as a guide for supplying a consumable electrode (hereinafter, simply referred to as a wire) to a welding portion through a wire through hole 3 provided at the center thereof, and as a power supply for supplying a welding current to the wire.

The chip 5 supplies contact power to the wire,
At the time of power feeding, the contact portion of the wire becomes high in temperature, and the wire feeding hole 3 is significantly worn due to the feeding of the wire, and depending on the worn state, it cannot serve as a guide for the wire or a power feeding to the wire.

Therefore, the conventional chip is entirely composed of chromium copper, which has excellent wear resistance at high temperatures.

However, in such a conventional chip, since the whole is made of expensive chrome copper, the material cost is very high, and there are some problems in processing.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is composed of two parts, a core part for contacting a consumable electrode and a remaining contact tip body part, and a consumable electrode for a consumable electrode in a central part. In the method of manufacturing a contact tip for welding having a through hole, a hard wire having an outer diameter corresponding to the inner diameter for supplying a welding current to the consumable electrode is inserted into the core portion, The contact tip material is extended and pressed with a die to form a consumable electrode through hole, the core portion and the contact tip body portion are pressed together, and the core portion is formed of a coil.

In addition, the heterogeneous portion is provided on either or both of the inner surface side of the contact tip body portion and the outer surface side of the core portion.

In addition, the core portion has a T-shaped cross section that fits into the contact tip body portion.

Further, the axial length of the core portion is the total length of the contact tip.

Further, the axial length of the core portion is at least 2 mm or more from the tip of the contact tip.

Operation The effects of this technical means are as follows.

The wire guide and the minimum portion (core) of the consumable electrode through hole, which is the power supply point for welding current, are solid and heat resistant.
By constructing a hard conductive body with excellent wear resistance with an inexpensive soft conductive metal, most of the chip is composed of the chip body, significantly reducing the material cost of the entire chip It is possible to increase the mechanical coupling.

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

In FIG. 1 (a), 1 is a core part and 2 is a chip body part. The core 1 is wound in a coil shape, and the coil wire diameter of 0.1 mm to 2 mm is effective, and 0.5 mm to 1.2 mm is most practical. If it is less than 0.1 mm, the effect of the core portion 1 is significantly weakened, and if it exceeds 2 mm, coil processing is difficult and cost merit is reduced. The winding pitch is a wire diameter ratio of 1 (close winding) ~
Double (sparse winding) is effective. If it exceeds 2 times, the fixation of the coil becomes unstable, the power supply to the wire 4 becomes unstable, and the stability of the welding current becomes poor. At this time, the tip end portion, which is particularly worn, may be closely wound and the rear portion may be loosely wound.

In this embodiment, as a method of joining the core portion 1 and the chip body portion 2, the core portion 1 is inserted into the chip body portion 2 and the core portion 1
Insert a hard wire having an outer diameter corresponding to the inner diameter for supplying a welding current to the wire 4, and apply impact pressure to the tip material with a die having a conical shaped portion from the outer periphery of the tip body. On the other hand, a mechanical joining means is used in which the tip material is expanded and pressed to form a combination of inner diameters for feeding a welding current to the wire through hole 3 (hereinafter referred to as swaging). Also, as a joining method, other mechanical joining (screw-in of coil, caulking, etc.),
Both chemical bonding and metallic bonding can be used. FIG. 1 (b) shows a sectional view after swaging.

At this time, the length of the coil (core portion) is as shown in FIG.
A part of the tip of the chip (20 mm in the embodiment) may be used, or the entire length of the chip may be used as shown in FIG.

In case of pressure welding by swaging, Fig. 1 (b)
As described above, since the chip body portion 2 is embedded in the gap between the pitches of the chip body portion 2 and the coil (core portion 1) during the swaging process, the core portion 1 is pressed and fixed, and the wire feeding At this time, the core portion 1 does not move in the axial direction (without being pushed out), and even at a large current, almost no heat generation is observed at the pressure contact portion.

Further, in order to reach the mechanical connection between the core portion 1 and the chip body portion 2, the tip body portion 2 has a tip bent inward, or the inner surface side of the chip body portion 2 and the outer surface side of the core portion 1 Inhomogeneous parts (uneven parts, knurled parts, etc.) may be provided on either or both of them.

In the chip 5, the guide portion of the wire 4 and the wire 4
The portion that serves as the power supply point for welding current to the wire through hole 3
Since this is an inner wall thin layer portion, this important thin layer portion is used as the core portion 1, which is made of hard conductive metal, and the remaining portion (chip body portion 2) is made of economical soft conductive metal. Due to the configuration, the life of the chip 5 is almost the same as the conventional product,
Moreover, it is easy to process and inexpensive chips can be supplied to the market.

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

In the present embodiment, the core part 1 of the prior art example is formed by coiling a core into a pipe or a solid round bar.

The length of the pipe and the solid round bar is the tip of the tip (20 mm in the embodiment) as shown in Fig. 2 (a), or Fig. 2 (b).
The total length of the chip may be The effective thickness of pipes and solid round bars is 0.1mm to 2mm.

The joining means was the same as that of the above-mentioned embodiment, and the effect was the same as that of the above-mentioned embodiment.

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

In this embodiment, the core 1 has a T-shaped cross section. In FIG. 3 (a), 1 is a T-shaped core,
2 indicates a chip body. In the figure, a length of 1 mm or more is effective, and 2 mm to 15 mm is most practical. Further, the length of the fitting portion b is preferably 2 mm or more from the viewpoint of mechanical connection,
The entire length of the chip may be used as shown in FIG.

The joining means was the same as that of the above-mentioned embodiment, and the effect was the same as that of the above-mentioned embodiment.

EFFECTS OF THE INVENTION As described above, the present invention has the following effects.

(1) By configuring the chip with the core part (hard conductive metal) and the chip body part (economical soft conductive metal), the performance and life are the same as the conventional one, and the material cost is low.

(2) Since the chip body is made of soft conductive metal,
Work efficiency such as chip outer shape processing can be improved. In addition, the service life of processing tools such as cutting tools and rolling rollers is extended.

(3) By forming the core portion into a coil shape, a drilling process using a drill such as chrome copper is omitted. This saves maintenance due to breakage of the drill and improves work efficiency.

(4) Also, mechanical coupling can be increased.

[Brief description of drawings]

FIG. 1 is a sectional view of a chip showing an embodiment of the present invention, 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. 1 ... Core part, 2 ... Chip body part, 3 ... Wire through hole, 4 ... Wire, 5 ... Contact chip.

Front page continuation (72) Inventor Sakano Yoshatsu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Yukitoshi Yamada 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsumi Handa 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-59-183985 (JP, A)

Claims (5)

(57) [Claims] 1. A method of manufacturing a contact tip for welding, comprising a core portion in contact with a consumable electrode and a remaining contact tip body portion, and having a through hole for a consumable electrode in a central portion thereof. Insert a hard wire with an outer diameter equivalent to the inner diameter for supplying welding current to the consumable electrode, and extend and pressurize the contact tip material with a die from the outer periphery of the contact tip body to make the consumable electrode Forming a through hole,
A method for manufacturing a contact tip for welding, in which the core and the contact tip body are pressed together and the core is composed of a coil. 2. A method of manufacturing a contact tip for welding, comprising a core portion in contact with a consumable electrode and a remaining contact tip body portion, and having a through hole for a consumable electrode in a central portion thereof. Insert a hard wire with an outer diameter equivalent to the inner diameter for supplying welding current to the consumable electrode, and extend and pressurize the contact tip material with a die from the outer periphery of the contact tip body to make the consumable electrode Forming a through hole,
And a method for manufacturing a contact tip for welding, in which the core portion and the contact tip body portion are pressure-contacted with each other, and a heterogeneous portion is provided on either or both of the inner surface side of the contact tip body portion and the outer surface side of the core portion. . 3. A method for manufacturing a contact tip for welding, comprising a core portion in contact with a consumable electrode and a remaining contact tip body portion, and having a through hole for the consumable electrode in a central portion thereof. Insert a hard wire with an outer diameter equivalent to the inner diameter for supplying welding current to the consumable electrode, and extend and pressurize the contact tip material with a die from the outer periphery of the contact tip body to make the consumable electrode Forming a through hole,
A cross-section T in which the core portion and the contact tip body portion are pressed together and the core portion is fitted into the contact tip body portion
Method of manufacturing a contact tip for welding in a V shape. 4. A method of manufacturing a contact tip for welding, comprising a core portion in contact with a consumable electrode and a remaining contact tip body portion, and having a through hole for the consumable electrode in a central portion thereof. Insert a hard wire with an outer diameter equivalent to the inner diameter for supplying welding current to the consumable electrode, and extend and pressurize the contact tip material with a die from the outer periphery of the contact tip body to make the consumable electrode Forming a through hole,
A method for manufacturing a contact tip for welding, in which the core portion and the contact tip body portion are pressed together and the axial length of the core portion is set to the entire length of the contact tip. 5. A method for manufacturing a contact tip for welding, comprising a core portion in contact with a consumable electrode and a remaining contact tip body portion, and having a through hole for a consumable electrode in a central portion thereof. Insert a hard wire with an outer diameter equivalent to the inner diameter for supplying welding current to the consumable electrode, and extend and pressurize the contact tip material with a die from the outer periphery of the contact tip body to make the consumable electrode Forming a through hole,
A method for manufacturing a contact tip for welding, in which the core portion and the contact tip body portion are pressed together, and the axial length of the core portion is at least 2 mm or more from the tip of the contact tip.