JPS60250885A - Water-cooling cable for spot welding - Google Patents

Abstract

PURPOSE:To obtain a titled water cooling cable whose fastened part has high durability and which is inexpensive by inserting a cable core wire by making the end part uniform, into a thick copper pipe for a terminal provided with a hose installing part, fastening gradually the end part to a shape plane by pressing, and brazing and sealing tightly the end part containing a pierced part. CONSTITUTION:A cable core wire 14 is inserted by making the end part uniform, into a thick terminal use copper pipe 13b having an installing groove 19 of a feed water flexible hose 20. The vicinity of this end part is pressed gradually 26 so as to become a plane 13a, and a core wire 14 is compressed and fastened firmly. A pipe 15 is fitted into a pierced terminal installing hole 16, and its end part 17 and a compressed end part 18 are brazed and sealed tightly. A feed water nipple 22 and the hose 20 are fastened 21, 23, and a water-cooling cable for spot welding is completed. The cable is watertight, does not damage the core wire 14, has durability, and also is inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION (Related Technical Field) The present invention relates to a water-cooled cable for spot welding used in the automobile industry, electric train manufacturing industry, shipbuilding industry, and other electrical product manufacturing lines.

When performing spot welding, the welding gun is operated at various angles depending on the welding location, so bending is necessary.

Physical repetitive fatigue such as twisting is applied to the cable.

Furthermore, the welding current ranges from 8,000 amperes to 15,000 amperes.
Due to the high current of 1,000 amperes flowing through the cable, the cable heats up and this process is repeated. Also, when this current is applied, a shock called a kick occurs, so that the cable core wires hit each other strongly. Such physical fatigue and electrical shock are concentrated on the operating section near the fixed terminal section, and act repeatedly on the cable each time the cable is struck, resulting in breakage of the operating section. At the same time, each time a large current flows, the cable temperature rises, causing overheating and disconnection, making the cable unusable.

If it becomes unusable, it will naturally have to be replaced, but not only the cost of the cable, but also the loss of operating time required for replacement and the man-hours involved in replacing the cable are costly. It is extremely uneconomical that it takes a considerable amount of time just to replace a cable, even though the production line is running at a production rate of one unit every tens of seconds.

(Conventional technology) FIG. 1 shows the end structure of a known water-cooled cable.

2 is a machined terminal metal fitting made of brass, for example, and the main body portion 1a is cylindrical and has a concentric water hole 2 through which cooling water passes. (2) b is a mounting portion, which has a rectangular cross section and is provided with a mounting hole 3. Reference numeral 1c denotes a notch in the main body, to which cable core wires 5 made of a plurality of bare copper wires are crimped and connected by an attachment ring 4. The crimp joint is crimped to form a recess 6 at the top, as shown in FIG. Cooling water passes through this recess 6 as shown by arrow a in FIG. Reference numeral 7 denotes a concave groove provided on the outer periphery of the main body portion 1a, into which a boss 8 is tightened by a fastener 9. 1° is a nipple, which is screwed into a threaded hole 11 provided in the main body portion 1a. A water supply pipe 12 is attached to the nipple 10. Note that although only one end is shown in the figure, the other end has a similar configuration, and cooling water is passed from end to end, and the cable core wire 5 becomes hot.
It is supposed to cool down.

Now, in this configuration, the terminal hardware 1 is made by machining a round bar of Muku J, and the machining is not easy.Moreover, the terminal hardware 1 is made by removing the cable core wire 5 and reusing it. High pressure is applied to the cable crimp joint each time, and although it is not visible to the naked eye, cracks occur, and after the cable is replaced about three times, it becomes unusable.

(Object of the Invention) The present invention improves the terminal hardware in the prior art as described above, and even if repeated bending stress is applied to the joint between the cable core wire and the terminal hardware, the fatigue level of that part is low, so that the cable The purpose is to provide a water-cooled cable that is difficult to cut.

It is also an object of the present invention to provide a water-cooled cable that is easier to manufacture and can be provided at a lower cost by having a simpler structure than conventional cables.

Furthermore, with such an inexpensive and durable water-cooled cable, we are trying to provide a water-cooled cable that is fully cost-effective without the need to use the water-cooled cable as a consumable item and reuse the terminal hardware as in the past. It is something to do.

(Summary of configuration) Terminal metal fittings are fixed to both ends of the core wire of a cable consisting of a plurality of non-insulated wires, and a hose is attached between these two terminal metal fittings, and the terminal metal fittings are crimped to the ends of the cable core wire. It consists of a fixed mounting part with a rectangular cross section, and a large diameter main body part that smoothly connects to the mounting part and provides a water passage space between the cable core wire, and the mounting part and the large diameter main body part The connecting portion expands toward the main body side, and is connected so as to form a concave curve toward the expanded portion.

(Example) Examples will be described with reference to FIGS. 1 to 3.

13 is a terminal hardware according to the present invention, which is made of a thick copper pipe with a relatively large wall thickness.

Reference numeral 14 denotes a cable core wire made of countless bare copper wires fixed to the terminal hardware 13. Cable core wire 14 and terminal hardware 13
To fix the two, align the ends of the two and press one end of the terminal metal so that the cross section is rectangular to make a crimp connection.

The crimp joint has a rectangular cross section, and this portion serves as the attachment portion. This mounting portion 13a has a hole 16 into which the pipe 15 is inserted.
should be drilled. The pipe 15 is fitted into the hole 16, and both ends 17 of the pipe 15 are brazed to the mounting portion 13 for sealing. The end 18 of the cable core wire 14 is also brazed to completely seal the end. In this case, the cable core wire 14 is immersed in a melted soft metal such as solder, and the soft metal is infiltrated between each core wire, which is then inserted into a copper pipe and press-molded. Core wire 1
4 is a copper pipe, 3 is inserted and molded. Alternatively, a surface treatment method may be used in which a soft metal such as solder is plated on the rectangular molded surface.

Reference numeral 19 denotes a concave groove provided for attaching the hose 2o, which is secured by tightening with a fastener 21, as in the known example.

A nipple 22 is screwed into a screw hole 23 provided in the terminal metal fitting 13 to be attached. 24 is a water supply hose.

Reference numeral 25 denotes a chamfered portion of the terminal metal fitting, which is provided to protect the cable core wire 14.

Reference numeral 26 denotes a connecting portion between the large-diameter main body portion 13b of the terminal hardware 13 and the mounting portion 13a having a rectangular cross section, and is configured with a conical expanding portion that expands smoothly, thereby repeatedly bending the cable core wire. Even if you do, it will not break. In this case, if the main body part 13b and the mounting part 13a are simply pressed to form the mounting part 3a, which has a rectangular cross section, the connection part between the main body part 13b and the mounting part 13a will be connected linearly and at an angle, which will reduce the lifespan of the cable core wire inside. have a negative impact.

In order to prevent this, the present applicant first made an invention and filed a patent application in 1983.
-851. ．． No. 61 or U.S. Patent No. 4,394,53
As in the air-cooled cable disclosed in No. 3, in order to maintain as much of the circular cross section of the terminal metal material in the expanded portion as possible after molding, a third
Press molding is performed so that a concave curve 27 is formed toward the expanded portion 26 as shown in the figure.

In FIG. 6, unlike the previous embodiment, the mounting portion 13a is replaced with the main body portion 13b.
It is tilted at an angle of about 30 degrees. Even in this configuration, the circular cross-section of the main body and the rectangular cross-section of the mounting portion are connected by an expanding portion that expands smoothly, and the structure is such that the core wire is prevented from breaking due to bending, as in the above embodiment. is exactly the same.

(Effects) Since the connection part 26 between the mounting part with a square cross section] and the main body part 13b with a circular cross section is a substantially conical widening part, this part is not bent or twisted during welding work. Since the cable core wire can be bent and twisted easily, the cable will not be damaged and a long service life can be guaranteed.

Further, the expanded portion and the mounting portion having a rectangular cross section are smoothly continuous. In other words, since the connection is made with a concave curve 27 toward the expanded portion side, the peripheral edge of the expanded portion can maintain a substantially circular cross section even after molding, so it is completely natural for the cable core wire to break at this portion during welding. However, its durability is outstanding.

Since a relatively thick copper pipe is used as a material and the cable core wire is crimped and bonded with a press, the construction of the water-cooled cable is simple and can be provided at low cost. Therefore, the water cooling cable itself can be used as a consumable item, and the effect of saving time and the like required for replacement is enormous.

If the end of the cable core wire or the mounting hole is brazed, there will be no water leakage, and the function as a water-cooled cable is no different from conventional products, and the benefits of using a spot welding machine are enormous. be.

[Brief explanation of drawings]

FIG. 1 is an end sectional view of the water-cooled cable of the present invention. FIG. 2 is a sectional view taken in the direction of the ■ arrow in FIG. FIG. 3 is a perspective view of the attachment part and the expansion part. FIG. 4 is a sectional view of a conventional water-cooled cable. FIG. 5 is a sectional view taken in the direction of the ■ arrow in FIG. FIG. 6 is a sectional view showing another embodiment. In the figure; 1 (machined) terminal hardware 2 Water hole 3 Mounting hole 4 Mounting ring 5 Cable core wire 6 Recess 7 Recess groove 8 Hose 9 Tightening tool 10 Nipple 11 Screw hole ]2 Water supply pipe 13 Terminal hardware 1.3a Mounting part 13b Main body part 14 Cable core wire 15 Vibrator 16 Hole 17 Pipe end 18 Cable core end 19 Concave groove 20 Hose 21 Tightening tool 22 Nipple 23 Thread hole 24 Water supply hose 25 (Terminal hardware) chamfered part 26 Connection part (between the mounting part and the main body part) 27 concave curve that's all Applicant Mitsuo Uchifuji Agent: Patent Attorney Isamu Ohashi Figure 4 Figure 3 Figure 5

Claims (1)

[Claims] Terminal metal fittings are fixed to both ends of a cable core wire consisting of a plurality of non-insulated wires, and a hose is attached between these two terminal metal fittings, and the terminal metal fittings have a rectangular cross section and are crimped and fixed to the ends of the cable core wires. and a large-diameter main body that smoothly connects to the mounting part and provides a water passage space between the cable core, and the connection between the mounting part and the large-diameter main body is connected to the main body. 1. A water-cooled cable for spot welding, characterized in that the cable expands in a substantially conical shape toward the end of the attachment portion, and is connected at the end of the attachment portion so as to form a concave curve toward the expanded portion.