JPH11104844A - Welding chuck for flash butt welding machine and its combination structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove a piled-up part and a deposit in a welded part by forming a wedge shape projecting parts at the corners composed of the contacting surfaces with materials to be welded and the inner side surfaces positioned at the center line side of a welding machine. SOLUTION: Wedge shape projecting parts 20a, 22a are formed at the corner parts composed of the contacting surfaces 20e, 22e with materials to be welded of an upper pair and a lower pair of upper and lower chucks 20, 22 and the inner side surfaces 20b, 22b in the center line C side of a welding machine, respectively. The materials to be welded are clamped with the upper chuck 20 and the lower chuck 22. The welding part is heated by supplying a current and materials to be welded are joined by upset movement. A piled-up part and a deposit generated at this time, are cut off and removed with the wedge shape projecting parts 20a, 22a. Even if these parts can not fully be removed, since a notch can be formed, the piled-up part and the deposit are surely trimmed in a following trimming process. The wedge shape projecting parts 20a, 22a are desirable to be separately and changeably fitted to the upper and the lower chucks 20, 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding chuck for a flash butt welding machine and a combined structure thereof used in, for example, a welding process of a rim for an automobile wheel.

[0002]

2. Description of the Related Art A rim 2 used for an automobile wheel 1 as shown in FIG. Then, it is manufactured by roll forming. In this flash butt welding, as shown in FIG. 6, a round bar 6 is attached to a lower chuck 3 on the left and right attached to a body 7 of the flash butt welding machine, and left and right horns 5 located on the upper part of the welding machine body 7. Between the upper and lower chucks 4 attached to the left and right, upper and lower welding chucks.
By moving one of the upper and lower chucks 3 and 4 to the other upper and lower chucks 3 and 4 while flowing a high current, the tips of the bars are brought close to each other, a flash is generated and the tips are melted, and the final operation is performed. By the upset, the ends in the molten state were joined to each other. In this case, the shape of the corner of each chuck viewed from the front of the flash butt welding machine was usually a right angle.

[0003]

However, as shown in FIG. 7, the welded portion after welding has a raised portion 8 of molten metal, on which a deposit 9 of fine metal particles by flash is inevitably formed. Had been formed. The raised portions 8 and the deposits 9 are mechanically removed in the next trimming step. However, since the shape of the raised portions is not constant, there is a variation in finish even after trimming, which is a problem in quality. Therefore, depending on the finished condition, manual repair work is required, which hinders productivity. In addition, the cutting tool used in the trimming process is worn and needs to be replaced in a regular cycle even in a normal case. Was shortened. SUMMARY OF THE INVENTION An object of the present invention is to provide a welding butt of a flash butt welding machine and a combination structure thereof, which can efficiently remove a swelling portion and a deposit of a welding portion, further improve the quality of a welding portion and prevent damage to a blade tool and the like. Is to do.

[0004]

A welding chuck for a flash butt welding machine according to the present invention which achieves the above object of the present invention is as follows. (1) In a welding chuck for a flash butt welding machine, a wedge-shaped projection is formed at a corner formed by a contact surface of an object to be welded and an inner surface located on a center line side of the welding machine. Welding chuck for flash butt welding machine. (2) The welding chuck for a flash butt welding machine according to (1), wherein the wedge-shaped projection is exchangeably mounted on the welding chuck body separately. (3) In the combination structure of the welding chucks for the flash butt welding machine, which is constituted by a pair of upper and lower welding chucks arranged on the left and right, at least one of the upper and lower one of the left and right upper and lower welding chucks has a contact surface with the workpiece. A combination structure of a welding chuck for a flash butt welding machine, wherein a wedge-shaped projection is formed at a corner defined by an inner surface located on the center line side of the welding machine. (4) The combination structure of a welding chuck for a flash butt welding machine according to (3), wherein the wedge-shaped protrusions are formed on a pair of upper and lower welding chucks on both the left and right sides.

[0005]

In the welding chuck for the flash butt welding machine of the above (1), a wedge-shaped projection is formed at a corner formed by the contact surface of the workpiece and the inner surface located on the center line side of the welding machine. In addition, the wedge-shaped protrusion can serve as a blade tool, and can remove notch that is easy to remove in a later step by removing a build-up of a weld metal by swelling or flashing. In the welding zipper for a flash butt welding machine of the above (2), the wedge-shaped projection is replaceably and separately attached to the welding chuck body, so that the projection that is easily damaged or worn can be replaced. In addition, by forming only the protruding portion from a durable material, it is possible to increase the efficiency and economy of exchanging the protruding portion. In the combination structure of the welding chuck for a flash butt welding machine according to the above (3), at least one of a pair of upper and lower welding chucks on the left and right sides is formed by an inner surface located on a contact surface of a workpiece and a center line side of the welding machine. Since the wedge-shaped protrusion is formed at the formed corner, the wedge-shaped protrusion has a role like a blade. Weld bulges can be removed when welding is completed,
If the next trimming step can be omitted, or if it cannot be omitted, the next step can be stabilized and the efficiency can be improved. In the combination structure of the welding chuck for the flash butt welding machine of the above (4), since the wedge-shaped projection is formed on the pair of upper and lower welding chucks on both the left and right sides, the operation of the above (3) can be performed more reliably. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A welding chuck for a flash butt welding machine and a combined structure thereof according to a preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the shape of the welding chucks and the arrangement of the welding chucks. In FIG. 1, reference numeral 20 denotes an upper chuck, and reference numeral 22 denotes a lower chuck. The upper chuck 20 is attached to each of the left and right horns. The lower chuck 22 is attached to the welding machine body. (The mounting relationship between the upper chuck and the horn and the lower chuck and the welding machine main body are the same as those in the related art, and are not shown. For the conventional structure, see FIG. 6.)
When viewed from the front, the shape of the upper chuck 20 includes an inner surface 20b that is a surface on the center line C side of the welding machine, an outer surface 20c that is a surface on the opposite side to the center line C of the welding machine, and an object to be welded. It comprises a workpiece contact surface 20e and an upper side face 20d that contact and hold the workpiece. Workpiece contact surface 20e and inner surface 20
A wedge-shaped protrusion 20a that is pointed toward the center line C of the welding machine is formed at the corner defined by b.

The left and right upper chucks 20 are attached to a horn with the wedge-shaped protrusions 20a facing each other. The shape of the lower chuck 22 is basically
And the arrangement is the same as that of the upper chuck except that the upper chuck 20 is turned upside down and arranged on the lower side, so the same suffix a, b, c, The description is omitted by adding d and e. In FIG. 1, the wedge-shaped protrusions 22a and 20a of the lower chuck 22 and the upper chuck 20 are formed integrally with the lower chuck 22 and the upper chuck 20, respectively. Due to its shape, it is easily worn or damaged, so as shown in FIG. 2, it is manufactured separately from a stronger material and nested, and the lower chuck 22 and the upper chuck 20 are bolted with bolts 24 or the like. It is desirable to have a structure that can be attached and replaced.

Next, a welding method using the upper chuck 20 and the lower chuck 22 will be described. First, FIG.
As shown in (a), both ends of the rounded rim material 6 which is the portion to be welded are connected to the wedge-shaped projections 20 of the upper chuck 20.
a, the wedge-shaped projections 22a of the lower chuck 22 are respectively set toward the center line side of the flash butt welding machine,
It clamps between the upper chuck and the lower chuck 22. Next, by flowing a low voltage, high current between the electrodes,
The weld is preheated, then a flash is generated and both ends of the rim blank 6 melt. Furthermore, by the upset operation,
When one of the upper and lower one of the left and right welding chucks moves in the direction of the other upper and lower welding chucks, the molten metals at both ends come into contact with each other and are joined, and the molten metals pressed against each other form the bulging portion 8. Form. Deposits 9 by flash are deposited on the raised portions 8.

However, at the time of the upset operation, the contact surfaces 20e, 20e, of the pair of upper and lower welding chucks 20, 22 are to be welded.
Each of the corners formed by the center line 22e and the inner surface 20b on the center line side of the welding machine has a wedge-shaped protrusion 20a.
22a, the wedge-shaped protrusions
0a and 22a play the role of the cutting edge,
And the deposit 9 is removed just to cut or cut. In this case, even if the raised portion 8 and the deposit 9 cannot be completely removed, the cut can be made. Therefore, the trimming can be surely performed in a trimming process in the next process, the quality is improved, and the repair work such as a residue is eliminated. Can be. The wedge-shaped protrusion is desirably provided on all four chucks, left, right, and upper and lower, but depending on the case, it may be provided only on one of the right and left upper and lower chucks. FIG. 4 shows the raised portion 8 and the deposit 9 at the time of flash butt welding.
FIG. 2 is an enlarged front view showing a state of removal by 2;

[0010]

According to the welding chuck for a flash butt welding machine of the first aspect, the wedge-shaped projection is formed at the corner formed by the contact surface of the workpiece and the inner surface located on the center line side of the welding machine. Since it is formed, the wedge-shaped projecting portion serves as a blade tool, and it is possible to remove deposits due to swelling or flashing of the weld metal and to make it easy to remove in a later step. According to the welding chuck for a flash butt welding machine according to the second aspect, the wedge-shaped projection is manufactured separately from the welding chuck body and is replaceably attached to the welding chuck body. The protrusion can be replaced, and only that portion can be made of a durable material, which is economical. According to the combination structure of the welding chuck for a flash butt welding machine according to claim 3, at least one of the right and left upper and lower pair of upper and lower welding chucks is located on the center line side of the welding machine and the contact surface of the workpiece. The wedge-shaped protrusions are formed at the corners formed by the wedge-shaped protrusions, so that the wedge-shaped protrusions can have the role of a blade. The trimming step of the next step can be omitted, or even if it cannot be omitted, the next step can be stabilized and the efficiency can be improved. According to the combination structure of the welding chuck for a flash butt welding machine according to the fourth aspect, since the wedge-shaped protrusion is formed on the pair of upper and lower welding chucks on both the right and left sides, the operation and effect of the third aspect can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a welding chuck for a flash butt welding machine and a combination structure thereof according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing another embodiment of the present invention.

FIG. 3 is a front view showing a state at the time of welding by a welding chuck for a flash butt welding machine and a combination structure thereof according to the present invention.

FIG. 4 is an enlarged front view showing a state at the time of welding by a welding chuck for a flash butt welding machine and a combination structure thereof according to the present invention.

FIG. 5 is a sectional view showing the structure of a vehicle wheel.

FIG. 6 is a front view showing a conventional welding chuck for a flash butt welding machine and a combined structure thereof.

FIG. 7 is a sectional view showing a state of a welded portion by flash butt welding.

[Explanation of symbols]

 Reference Signs List 20 upper chuck 22 lower chuck 20a wedge-shaped protrusion 22a wedge-shaped protrusion 20e workpiece contact surface 22e workpiece contact surface C welding machine center line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Izumida 5-9 Yonbancho, Chiyoda-ku, Tokyo Topy Industries, Ltd.

Claims (4)

[Claims] 1. A welding chuck for a flash butt welding machine, wherein a wedge-shaped projection is formed at a corner defined by a contact surface of an object to be welded and an inner surface located on a center line side of the welding machine. Welding chuck for flash butt welding machine. 2. The welding chuck for a flash butt welding machine according to claim 1, wherein the wedge-shaped projection is exchangeably mounted separately on the welding chuck body. 3. A combined structure of a welding chuck for a flash butt welding machine, comprising a pair of upper and lower welding chucks arranged on the right and left, and at least one of the upper and lower one of the right and left upper and lower welding chucks is in contact with a workpiece. A combination structure of a welding chuck for a flash butt welding machine, wherein a wedge-shaped protrusion is formed at a corner defined by a surface and an inner surface located on a center line side of the welding machine. 4. The combination structure of a welding chuck for a flash butt welding machine according to claim 3, wherein the wedge-shaped projection is formed on a pair of upper and lower welding chucks on both right and left sides.