JP2022061550A - Swivel type welding electrode - Google Patents

Abstract

To provide a method that materializes improvement of cooling effect for a revolving portion of a swivel type welding electrode in which the revolving portion is revolvable with respect to a base portion, thereby materializing improvement of durability of the electrode.SOLUTION: In a swivel type welding electrode 1 in which a revolving portion 3 is joined via a swivel joint 4 to a base portion 2 and the revolving portion 3 is axially divided into a first split body 3 on a tip side and a second split body 3b on a base end side, a cooling water supply passage s for cooling the electrode is formed on the whole length in a lengthwise direction of the base portion 2 and at least a part of the revolving portion 3, cooling water supplied through the cooling water supply passage s directly contacts the first split body 3a. In this case, an O-ring r for preventing water leak is provided on a spherical surface fitting portion k of the swivel joint 4, or coupling structure of the first and second split bodies 3a, 3b are taper-fitted, thereby preventing leakage of cooling water to the exterior.SELECTED DRAWING: Figure 3

Description

In the present invention, in an electrode used for spot welding or the like, the rotation portion on the tip end side of the electrode can rotate within a predetermined angle range with respect to the axial direction of the base portion on the proximal end side. Regarding technology for enhancing the cooling effect on the parts.

In order to save the trouble of replacement work due to electrode wear, etc., and to reduce running costs in welding work such as spot welding, the applicant has attached the electrode to the severely worn tip part and durable base end part. We are proposing a technology that reduces labor and cost by dividing the base into two parts and using the base end part for a relatively long time compared to the tip part. (See, for example, Patent Document 1.)

Utility Model Registration No. 3212770

By the way, in this technique, as shown in FIG. 7, as a swivel type electrode 51, a base portion 52 on the electrode base end side and a rotating portion 53 on the electrode tip side are formed by a swivel joint 54 having a spherical fitting portion k. By connecting and dividing the rotating portion 53 into a first divided body 53a on the distal end side and a second divided body 53b on the proximal end side, the first divided body 53a, which is heavily worn in the welding operation, is worn out. However, by continuously using the second divided body 53b, the running cost is reduced and the labor and time of the replacement work are reduced. By the way, in this conventional structure, as shown in FIG. 7B, the cooling water passage s is provided only in the base portion 52, and the cooling water is provided in the rotating portion 53, which is particularly severely worn. Since the passage is not formed, the cooling effect on the first divided body 53a that generates heat by directly contacting the work is not sufficient, and there is a problem in terms of the durability of the first divided body 53a.

Therefore, it is an object of the present invention to enhance the cooling effect on the rotating portion on the tip side of the electrode, which is particularly prone to heat generation and wear, and to further improve the durability.

In order to achieve the above object, in the present invention, the rotating portion on the distal end side is joined to the base portion on the proximal end side via a swivel joint having a spherical fitting portion, and the rotating portion is joined along the axial direction. It is divided into a first divided body on the distal end side and a second divided body on the proximal end side, and these first and second divided bodies can be bonded via an arbitrary bonding structure, and also can be bonded to the base portion and the second. In a swivel-type welding electrode in which a split body is joined and integrated via a swivel joint, cooling water is supplied to the entire length of the base portion in the length direction and at least a part of the rotating portion to cool the electrode. A passage was formed, and the cooling water supplied through the cooling water supply passage was configured to be in direct contact with the first divided body.

In this way, a cooling water supply passage for cooling the electrode is formed in the entire length of the base portion in the length direction and at least a part of the rotating portion, and the cooling water supplied through the cooling water supply passage is the first. By configuring it so as to be in direct contact with the 1-divided body, the cooling effect of the rotating portion is enhanced, and in particular, by directly contacting the cooling water with the 1-divided body, the degree of wear of the 1-divided body can be suppressed. can.

At this time, it is effective to provide a sealing mechanism in the spherical fitting portion of the swivel joint to prevent water leakage, and the coupling structure of the first and second divided bodies is tapered fitting or screwed. Make an expression join.
That is, the cooling water supplied through the cooling water supply passage inevitably easily leaks to the outside through the spherical fitting portion of the swivel joint and the connecting surface of the first and second divided bodies. Therefore, the spherical fitting portion By providing a sealing mechanism on the surface, it is possible to prevent groove leakage from the spherical fitting portion. Further, if the coupling structure of the first and second divided bodies is tapered fitting, water leakage from the fitting portion can be prevented.
When the coupling structure of the first and second divided bodies is a screw type coupling, when the screw portion is a straight screw, it is necessary to provide an O-ring or the like as a sealing mechanism around the screw portion. However, by making the screw portion a tapered screw, the thread of the male screw and the thread groove of the female screw come into close contact with each other, and water leakage from the joint can be prevented.

Further, a flange portion for regulating the rotation angle of the rotating portion is formed on the tip end side of the substrate portion, and when the rotating portion rotates to a certain angle, a part of the rotating portion comes into contact with the flange portion. By preventing the rotation from further rotating, it is possible to prevent the rotating portion from rotating too much and causing problems such as welding defects when the tip of the electrode is worn and the dressing work is performed.

For swivel type welding, the rotating part is joined to the base part via a swivel joint, and the rotating part is divided into a first divided body on the tip side and a second divided body on the proximal end side along the axial direction. In the electrode, a cooling water supply passage for cooling the electrode is formed in the entire length of the substrate portion in the length direction and at least a part of the rotating portion, and the cooling water supplied through the cooling water supply passage is divided into first portions. By configuring it so as to be in direct contact with the body, the cooling effect of the rotating portion is enhanced, and wear due to thermal damage can be prevented and durability can be improved. At this time, if a sealing mechanism for preventing water leakage is provided in the spherical fitting portion of the swivel joint, water leakage from the fitting portion can be prevented. Further, by making the connecting structure of the first and second divided bodies a tapered fitting or a screw type coupling, attachment / detachment can be easily performed, and particularly if a tapered fitting or a tapered screw structure is used, the tapered fitting can be performed. A sealing mechanism such as an O-ring is not required in the portion. In addition, by providing a flange portion on the tip end side of the substrate portion and restricting the rotation angle of the rotating portion to a certain level or less, there is a problem that the rotating portion rotates too much when dressing the tip portion of the electrode. It is possible to prevent welding defects and the like.

It is explanatory drawing for demonstrating the outline of spot welding. It is a welding electrode which concerns on this invention, (a) is the state which the 2nd division body of a rotating part is removed, (b) is the explanatory view of the state which the 2nd division body is connected. The components of the welding electrode according to the present invention are shown. FIG. It is a cross-sectional view of a state in which the portions are joined and integrally joined, and the first divided body is separated. It is explanatory drawing in the case of making the coupling structure of the 1st division body and 2nd division body of a rotating part into a screw type, (a) is the explanatory view in the case of combining a straight screw and an O-ring, and (b). Is an explanatory diagram when a taper screw is used. It is explanatory drawing which shows another example of the structure of the 1st division body and the 2nd division body of a rotating part. It is explanatory drawing when the flange part is formed on the tip end side of the substrate part, (a) is the front view, (b) is the explanatory view when the rotation part is restricted. It is explanatory drawing which shows an example of the conventional cooling structure, (a) is a perspective view, (b) is a vertical sectional view.

The welding electrode according to the present invention generates heat particularly in spot welding using a swivel type electrode in which a rotating portion on the tip side is rotatably connected to a base portion on the proximal end side via a swivel joint. This makes it possible to enhance the cooling effect on the rotating portion on the tip side of the electrode, which is easily worn, and further improve the durability, and the cooling water formed from the inside of the base portion to the inside of the rotating portion. The supply passage is characterized in that it is formed up to a part of the rotating portion.

Here, to explain the outline of spot welding, as shown in FIG. ₁ , spot welding means that _two materials W1 and W2 to be welded to be welded are sandwiched between a pair of electrodes D and a current is applied while pressurizing. This is _a technology that generates resistance heat _on the contact surfaces of the materials W1 and W2 to be welded to melt the contact surfaces of the materials to be welded and weld them together. When the contact surface of the welding material has a complicated shape, a so-called swivel type electrode 51 as shown in FIG. 7 may be used.

As shown in FIG. 7, the electrode 51 is connected to the base portion 52 attached to the device side of a stationary welder or the like by a spherical fitting portion k via a swivel joint 54 to the base portion 52. The rotating portion 53 is integrally provided, and the rotating portion 53 is rotatable within a predetermined angle range with respect to the axial direction of the base portion 52.

Therefore, for example, even when the surface of the sandwiched material to be welded has a complicated shape, when the electrode 51 pressurizes, the rotating portion 53 rotates so as to follow the surface of the material to be welded, and the material to be welded and the electrode. A sufficient contact area with the 51 can be secured, and the amount of energization is also secured so that welding defects and the like do not occur. However, in the case of such an electrode structure, when the electrode is replaced due to wear or the like, the entire electrode 51 is covered. The cost is high because it needs to be replaced.

Therefore, in the conventional swivel type electrode 51 of FIG. 7, the rotating portion 53 is divided into a first divided body 53a and a second divided body 53b along the axial direction, and is replaced with the first divided body 53a which is particularly severely worn. Focusing on the fact that the second divided body 53b can be continuously used even when the need arises, only the first divided body 53a can be replaced. In this case, the cooling water passage is used. Since s is provided only inside the substrate portion 52 and no cooling water passage is formed in the rotating portion 53 that is particularly severely worn, cooling the first divided body 53a that generates heat by directly contacting the work is particularly provided. As described above, the effect is not sufficient and the durability of the first divided body 53a is difficult.

Therefore, the swivel-type welding electrode 1 according to the present invention is particularly susceptible to heat damage or the like by forming the cooling water passage s formed inside the base portion 52 up to a part inside the rotating portion 53. It is characterized by enhancing the cooling effect of the 1-divided body 53a.

Then, the configuration of the swivel type welding electrode 1 according to the present invention will be sequentially described below with respect to the base portion 2, the rotating portion 3, the first split body 3a, the second split body 3b, the swivel joint 4, and the like.
As shown in FIG. 3, the substrate portion 2 is provided with a spherical portion 2q on the tip end side, and is provided with a cooling water supply passage s along the axial direction in the central portion of the inside. In this embodiment, the outer peripheral portion on the base end side of the base portion 2 is a tapered surface 2t because it is mounted by being inserted into the tapered hole of the mounting portion on the device main body side, but the mounting portion on the device main body side is a screw hole. If this is the case, a male screw may be used instead of the tapered surface 2t.
Further, the rotating portion 3 is divided into a first divided body 3a on the distal end side and a second divided body 3b on the proximal end side, and a spherical recess 3q is formed on the proximal end side of the second divided body 3b. The cooling water supply passage s is formed toward the tip side along the axial direction. Further, a tapered convex portion 3t is formed on the outside of the tip side of the second divided body 3b.
Further, on the base end side of the first divided body 3a, a tapered concave portion 3u that can be fitted to the tapered convex portion 3t of the second divided body 3b is formed.

In the swivel type welding electrode 1 as described above, the spherical portion 2q of the base portion 2 and the spherical concave portion 3q of the second divided body 3b are integrated in a fitted state, and are shown in FIG. 3 (b). As shown, after the O-ring r near the peripheral edge is interposed, the peripheral edge of the spherical recess 3q peripheral edge is caulked and integrated by a caulking tool.
Then, the swivel joint 4 is formed by the spherical fitting of the spherical portion 2q and the spherical concave portion 3q, and the spherical fitting portion k is formed by the O-ring r interposed between the spherical portion 2q and the spherical concave portion 3q. A sealing mechanism that blocks the flow of water is configured.

Then, in this state, the second divided body 3b becomes rotatable at a free angle within a predetermined angle range with respect to the axial direction of the base portion 2, and becomes a tapered convex portion 3t of the second divided body 3b. On the other hand, the tapered recess 3u of the first divided body 3a can be tapered and fitted.

When the second divided body 3b is assembled to the base portion 2 as described above, the state shown in FIG. 3B is obtained, and the second divided body 3b is rotatable at a free angle with respect to the base portion 2. At the same time, the O-ring r prevents the cooling water supplied through the cooling water supply passage s from leaking to the outside from the spherical fitting portion k of the swivel joint 4.
Further, in the connection between the first divided body 3a and the second divided body 3b, the tapered concave portion 3u of the first divided body 3a is tapered and fitted to the tapered convex portion 3t of the second divided body 3b, so that the first divided body 3a is connected. It is possible to prevent the cooling water from leaking from the fitting portion between the 3a and the second split body 3b in close contact with each other.

In the above embodiment, the connection between the first divided body 3a and the second divided body 3b is a tapered fitting, but as shown in FIG. 4, the male screw 3n of the second divided body 3b and the male screw 3n are used. It is also possible to make a screw type connection with the female screw 3 m of the first split body 3a. However, in this case, if the threaded portion is straight, cooling water may leak to the outside through the threaded portion, so it is necessary to provide a sealing mechanism such as an O-ring r in the vicinity of the screw fitting portion. This makes it possible to prevent the cooling water from leaking to the outside. The position of the O-ring r may be arbitrary as long as it is near the threaded portion.
On the other hand, as shown in FIG. 4B, by making the male screw 3n of the second split body 3b and the female screw 3 m of the first split body 3a into a tapered screw, the thread of the male screw 3n and the female screw 3 m can be obtained. The screw grooves come into close contact with each other, and water leakage can be prevented without using an O-ring r or the like. In this case, as the inclination direction of the taper, the male screw 3n has a tapered tip, and the female screw 3m has a direction in which the diameter narrows toward the deep side.

By the way, in the embodiment of FIG. 5, it is an example of a case where the divided forms of the first divided body 3a and the second divided body 3b are different. In this case, the shape of the first divided body 3a is formed into a T-shaped cross section, and the fitting convex portion a on the lower end side is inserted into the fitting concave portion b of the second divided body 3b so that it can be connected and fitted. A hole v through which cooling water can enter is provided in the lower surface portion in the center of the convex portion a so as to improve the cooling effect on the first divided body 3a.

Next, an example of restricting the rotation angle of the rotating portion 3 will be described with reference to FIG.
In this embodiment, the flange portion 2f is formed on the distal end side of the proximal end portion 2, and the distance m between the distal end side surface of the flange portion 2f and the proximal end side surface of the second divided body 3b of the rotating portion 3 is determined. By appropriately adjusting the relationship with the diameter φ of the flange portion 2f, when the rotating portion 3 rotates, the lower peripheral end portion E of the second split body 3b comes into contact with the flange portion 2f, and the rotating portion The rotation angle θ of 3 is regulated. This is because when the rotating portion 3 rotates at a predetermined angle θ or more, welding defects are likely to occur.

Further, in this embodiment, as the material of the base portion 2, the first divided body 31a and the second divided body 31b, chrome copper, dilyconium chrome copper, diriconium copper, beryllium copper, silicon-containing dilyconium chrome copper, brass. It is based on any combination of the above, and the cooling effect is enhanced.

The present invention is not limited to the above embodiments. Those having substantially the same configuration as the matters described in the claims of the present invention and having the same action and effect belong to the technical scope of the present invention.

In an industry where swivel-type welding electrodes with divided rotating parts are frequently used, effective cooling of rotating parts is possible, and durability and other factors can be significantly improved, so it will be used in a wide range in the future. Expected to spread.

1 ... Swivel type welding electrode, 2 ... Base part, 2f ... Flange part, 3 ... Rotating part, 3a ... First split body, 3b ... Second split body, 4 ... Swivel joint, r ... O-ring.

Claims (5)

The rotating portion on the distal end side is joined to the base portion on the proximal end side via a swivel joint having a spherical fitting portion, and the rotating portion is joined to the first divided body on the distal end side along the axial direction. It is divided into a second divided body on the side, and these first and second divided bodies can be bonded via an arbitrary bonding structure, and the base portion and the second divided body are joined via a swivel joint. A swivel-type welding electrode to be integrated, in which a cooling water supply passage for cooling the electrode is formed in the entire length of the base portion in the length direction and at least a part of the rotating portion, and the cooling water is formed. A swivel-type welding electrode characterized in that the cooling water supplied through the supply passage is configured to be in direct contact with the first divided body. The swivel-type welding electrode according to claim 1, wherein the spherical fitting portion of the swivel joint is provided with a sealing mechanism for preventing water leakage. The swivel-type welding electrode according to claim 1 or 2, wherein the coupling structure of the first and second split bodies is a tapered fitting or a screw coupling. The swivel-type welding electrode according to claim 3, wherein when the coupling structure of the first and second divided bodies is a screw type, a tapered screw structure is used. The swivel type according to any one of claims 1 to 4, wherein a flange portion for regulating the rotation angle of the rotating portion is formed on the tip end side of the substrate portion. Welding electrode.

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