JP3743919B2 - Stud cap manufacturing method and cap for arc stud welding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap that can form a stud for arc stud welding only by being fitted or press-fitted and fixed to the tip of a bar-like material cut to a desired length.
[0002]
[Prior art]
When embedding a base material in concrete, a rod-like material is implanted on the surface of the base material by arc stud welding in order to increase the bonding force between the base material and the concrete portion. Such a rod-shaped arc stud welding stud is formed as shown in FIG. 10 as an example. That is, the steel bar is cut to a desired length, and one end thereof is forged, or an external screw is formed at one end and a nut is screwed therein to form a head. Further, the cutting portion 11 is formed by cutting at least the outer periphery and end face of the stud 3 with a lathe or the like. Next, a hole was drilled in the tip surface, and flux 2 also serving as an electrode was press-fitted into the hole.
Such a stud is held by a chuck of an arc stud welding machine (not shown), and the arc shield 5 is fitted on the outer periphery of the cutting portion 11 and is held by the arc shield support 6 of the welding machine. And the tip of the stud is fixed to the surface of the base material 8 made of steel by arc stud welding, and then the base material 8 and the stud 3 are embedded in the concrete to increase the integrity of the concrete and the base material, or Other members are attached to the stud by screwing or the like and used as attachment members.
[0003]
[Problems to be solved by the invention]
However, such a conventional arc stud welding stud requires cutting and drilling of the tip edge and press-fitting of the flux 2 for each required stud length, and the stud 3 has its tip portion. There is a drawback that the cutting and drilling operations are relatively troublesome. In addition, it is necessary to transport the studs completed for each desired length having such a heavy weight from the factory to the site, and there is a drawback that it is particularly expensive to carry over a long distance. In addition, the productivity was poor and the price of the stud itself had to be expensive.
Accordingly, the present inventor has an object to provide a stud for arc stud welding studs that is easy to manufacture and that can be applied to light weight and various lengths of rod-shaped studs, and solves the problems. In order to do this, the following configuration is adopted.
[0004]
[Means for Solving the Problems]
In the first aspect of the present invention, the metal plate is deep-drawn to have a constant thickness, and the closed surface 1b is integrally provided only at one end of the cylindrical portion 1a, and the central portion of the closed surface 1b is provided. Forming the cap body 1 by forming the hole 1c;
Next, a flux material is fitted into the hole 1c, the tip side is formed into a spherical surface by a mold, and is fixed to the hole edge of the hole 1c so as to be fixed to the outer surface of the cap body 1. And 2 projecting,
An arc in which the cylindrical portion 1a is fitted to the distal end portion of the stud 3 made of a rod-shaped material and the outer periphery is fixed by caulking, or the distal end portion of the stud 3 made of the rod-shaped material is press-fitted into the cylindrical portion 1a. It is a manufacturing method of the stud cap for stud welding.
The present invention according to claim 2 is the method according to claim 1,
A cap of a stud for arc stud welding in which a hole ring portion of the hole 1c of the cap body 1 is previously subjected to burring so as to protrude outwardly so that the flux 2 does not substantially protrude from the inner surface of the closing surface 1b. It is a manufacturing method.
The present invention according to claim 3 provides:
A cap manufactured by the manufacturing method according to claim 1.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the cap of the present invention will be described with reference to the drawings.
1 is a perspective view showing an embodiment of a first cap of the present invention, FIG. 2 is a perspective view showing a state in which the cap is attached to a stud 3, FIG. 3 is a longitudinal sectional view thereof, and FIG. FIG. 5 is an enlarged view of the IV part of FIG. 3, and FIG. 5 shows a state in which a stud using the cap is welded.
The cap in this example is formed by forming a metal plate into a cylindrical body whose one end is closed by deep drawing, casting, or cutting. And the hole 1c shown in FIG. 4 is drilled in the center of the obstruction | occlusion surface 1b, and the flux 2 also serving as an electrode is fixed to the hole 1c. This fixing method is performed as shown in FIG. 8 as an example. That is, an extremely short columnar flux 2 having a flange portion at one end is inserted into the hole 1c of the closing surface 1b, and the lower surface of the flux 2 is supported by the fixed mold 12. Then, the movable mold 13 whose lower end is hemispherical is pressed against the upper end of the flux 2, and the tip end portion of the flux 2 is crimped to form as shown in FIG. In addition, since the material of this flux itself is well-known, the description is abbreviate | omitted.
[0006]
Next, in the example of FIG. 8, the flange portion is formed at the end of the flux 2. Instead, as shown in FIG. 9, a short columnar flux 2 is inserted into the hole 1c of the closing surface 1b, and the same as described above. The lower surface of the flux 2 may be supported by the fixed mold 12 and the movable mold 13 may be pressed against the upper end of the columnar flux 2 to form the flux 2 as shown in FIG. In this case, it is preferable to burring the hole edge of the hole 1c outward.
When the flux 2 is formed as shown in FIG. 9B, the flux 2 hardly protrudes on the inner surface side of the closing surface 1b. Therefore, the contact property between the closing surface 1b and the tip end surface of the stud 3 is good.
The cap of the present invention thus constructed is fitted on the tip of a stud 3 in which a steel bar is cut to a desired length as shown in FIG. And the cylindrical part outer periphery of the cap main body 1 is crimped with a comparatively simple tool or press machine, and the crimping part 4 is formed there. Or the front-end | tip part of the stud 3 which consists of a rod-shaped material is press-fitted in the cylindrical part 1a of the cap main body 1. FIG. In any case, the inner surface side end surface of the flux 2 contacts the end surface of the stud 3 as shown in FIG.
[0007]
The thus completed stud is fitted with an arc shield 5 on the outer periphery of its tip, and is held by an arc shield support 6 of an arc stud welder (not shown). Then, the upper end of the stud 3 is detachably held by a chuck of a stud welding machine (not shown), and then the tip of the flux 2 of the cap is brought into contact with the surface of the base material 8 to be stud welded in FIG. When the stud welding machine is started in this state, the current between the flux 2 and the base material 8 is energized, and then the stud 3 automatically rises slightly, and an arc discharge is generated between the tip of the flux 2 and the base material 8. appear. As the arc discharge continues, the tip of the cap body 1 and the tip of the stud 3 are melted, and a molten pool is formed on the base material 8. Next, by lowering the stud 3 and pressing it against the molten pool of the base material 8, a weld 9 shown in FIG. 5 is formed between the stud 3 and the base material 8.
[0008]
Next, FIGS. 6 and 7 show a second embodiment of the present invention. This example is different from the first example in that the axial length of the cylindrical portion 1a of the cap body 1 is made as large as possible. Is shortened. Thereby, the mass productivity of the cap body 1 can be improved. This is because it becomes easy to form the cap body 1 by deep drawing from a plate material. In addition, a screw is screwed into a part of the outer periphery of the stud 3, and another member is screwed and fastened there.
[0009]
[Operation and effect of the invention]
The method of manufacturing a stud cap for arc stud welding according to the present invention and a cap include arc stud welding of a desired length only by cutting a rod-like material into an arbitrary length and fitting or press-fitting the cap at the tip. A stud can be obtained. In addition, the cap manufacturing method involves deep drawing a metal plate to form a constant thickness, forming a hole 1c in the center of the closed surface 1b , and then fitting a flux material to 1c to The tip side can be formed into a spherical surface by a mold, and can be easily manufactured by securing it to the hole edge of the hole 1c . For this reason, the cap itself can be mass-produced extremely easily and inexpensively. And, unlike the arc stud welding stud of the conventional rod-shaped material, it is not necessary to cut the tip edge and the tip surface, and the work such as making a hole in the tip or press-fitting flux into the hole is unnecessary. Thus, a stud having a desired length can be made very easily on the site. Therefore, it is possible to lightweight the cap and transported to the work site or factory in the vicinity thereof, installing this cap to the rod-like stationary outer periphery with a simple tool. This eliminates the need for heavy, heavy, traditional lengths of completed studs to be transported over long distances from the factory to the site.
Further, the cap of the present invention has a simple structure and is easy to manufacture, and can provide it at low cost.
Next, when the burring process which projects the hole edge of the hole 1c of the cap body 1 to the outer surface side in advance is performed so that the flux 2 does not substantially protrude from the inner surface of the closing surface 1b , the tip of the stud 3 good contact with the surface, the integrity of both can be ensured, enabling a stable stud welding.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a first cap of the present invention.
FIG. 2 is a perspective view showing a state in which the cap of FIG. 1 is attached to a stud 3;
3 is a longitudinal sectional view of FIG.
4 is an enlarged view of a portion IV in FIG. 3;
FIG. 5 is a longitudinal sectional view showing a state in which a stud using the cap is welded.
FIG. 6 is a perspective view of a cap showing a second example of the present invention.
7 is a longitudinal sectional view showing a state where the cap of FIG. 6 is attached to the stud 3. FIG.
FIG. 8 is an explanatory view of attachment for attaching the flux 2 to the cap body 1;
FIG. 9 is an explanatory diagram showing another example.
FIG. 10 is a front view of a stud for arc stud welding made of a conventional rod-shaped material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cap main body 1a Cylindrical part 1b Closure surface 1c Hole 2 Flux 3 Stud 4 Caulking part 5 Arc shield 6 Arc shield support body 8 Base material 9 Welded part
10 Concrete
11 Cutting part
12 Fixed mold
13 Movable mold

Claims (3)

The metal plate is deep-drawn to a constant thickness, and a closed surface 1b is integrally provided only at one end of the cylindrical portion 1a, and a hole 1c is formed at the center of the closed surface 1b to form the cap body 1 Forming, and
Then, the by fitting the flux material in the hole 1c, thereby forming a distal end side to the spherical surface by a die, by fixing retaining hole edge of the hole 1c, the electrode-and the outer surface of the cap body 1 Flux And 2 projecting,
An arc in which the cylindrical portion 1a is fitted to the distal end portion of the stud 3 made of a rod-shaped material and the outer periphery is fixed by caulking, or the distal end portion of the stud 3 made of the rod-shaped material is press-fitted into the cylindrical portion 1a. A method of manufacturing a stud cap for stud welding . In claim 1,
Subjected to burring projecting advance on the outer surface side of the hole edge portion of the cap body 1 of the hole 1c, and the flux second cap arc stud welding studs to not substantially protrude from the inner surface of the closing surface 1b Production method. The cap manufactured by the manufacturing method of Claim 1 or Claim 2.

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