JP2780087B2 - Stud welding jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a jig used for stud welding.

[0002]

2. Description of the Related Art Stud welding is, as is well known, a method in which a so-called vertical bolt can be automatically planted without going through steps such as drilling and tapping. 8 is a welding method in which a stud is slightly separated from the base material through an electric current by causing a base material to come into contact with an end of the stud and an arc is generated. A welding gun 3 connected to a welding power source 1 via a control device 2 is used.

[0003] This stud welding is divided into a headed stud and a threaded stud, and the headed stud is used as a stopper (shear connector) and an anchor in steel and concrete structures for civil engineering and construction. For example, when the studs penetrate the deck plate and are welded to the beam, the beams and the reinforced concrete slab are strongly joined to each other to form a composite beam in which the three members are integrated.

By the way, as shown in FIG. 5, the headed stud 4 having the head 4a is adapted to fit the head 4a into a non-magnetic and conductive metal socket holder 5 provided at the tip of the welding gun 3. Set. The socket holder 5 is a cylindrical body having an open end, and a slit 6 extending in the longitudinal direction is provided in the cylindrical body wall so that the opening has elasticity.
It is easy to insert a by pushing and spreading, and it is difficult to get out by tightening.

[0005] In the figure, reference numeral 7 denotes a stopper for preventing the stud 4 with the head from entering any further. A bolt with a hexagonal hole is used for the stopper, and the protrusion length can be adjusted by screwing.

[0006]

As described above, in the prior art, the stud is directly inserted into the socket holder 5 provided at the tip of the welding gun 3 by pushing and expanding the socket holder. Without it, the stud cannot be set on the gun or is not easy without a protruding large diameter portion such as the head 4a of the headed stud 4. Furthermore, with a short stud, the tip of the welding gun 3 needs to be brought closer to the stud, which makes the handling operation of the driving difficult.

The present invention solves the disadvantages of the conventional example and expands the function of the conventional socket holder for a stud welding gun. The welding gun can be easily and reliably used with a short stud or a stud with a head. It is another object of the present invention to provide a stud welding jig which can be set at a predetermined height and which does not affect the operation of a welding gun due to a short stud.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a stud holder made of a non-magnetic and conductive metal which is removably fitted into a socket holder of a welding gun instead of a stud head. The magnet body is built-in, and the tip is a closed end having an outer surface with a stud suction surface. Second, the closed end of the tip is thick, and one end is joined to the magnet body here. The gist is that a soft iron core whose end is led out to the stud suction surface is buried.

According to the first aspect of the present invention, the stud holder is fitted into the socket holder of the welding gun.
Since the stud is intended to be attached to this stud holder, the projection of the welding gun from the socket holder is the same as the length of the stud holder and stud, and the welding gun cannot be so close even with a short stud. There is no effect on operation, such as the need to operate.

Further, the stud is such that the tip of the stud holder is attracted to the outer surface by magnetic force, and is not fitted as in the prior art, so that the stud can be easily set on the welding gun and has a head with no bulging portion. It can be set without any trouble even if it is not a stud. The stud holder is made of a conductive metal and transmits an electric current from the welding gun to the stud to generate an arc.

According to the second aspect of the present invention, the closed end at the tip of the stud holder is made thicker so that the distance between the stud suction surface and the magnet body can be increased. The soft iron core guides the studs to the stud suction surface, where the studs can be attracted and held.

Further, since there is a distance between the stud attracting surface and the magnet body, there is no possibility that the magnet body is exposed to a high temperature and the magnetic force is reduced. Further, since the closed end of the tip of the stud holder is made thick, it is possible to cope with the wear of the tip of the stud holder and endure long-term use.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a stud welding jig according to the present invention, FIG. 2 is a side view showing a use state of the same, and FIG.
This is a socket holder provided at the tip of the welding gun. The socket holder 5 is a cylindrical body having an open end as described above, and a slit 6 extending in the longitudinal direction is formed in the cylindrical body wall.
Is provided so that the opening has elasticity, and the head of the stud with a head can be inserted by pushing and expanding the head through the opening at the tip end.

The jig of the present invention uses the socket holder 5
Is a stud holder 8 that can be inserted in place of the headed stud, and is made of a nonmagnetic and conductive metal of a Cr—Cu (chromium / copper) alloy.

Further, in this embodiment, the stud holder 8 is formed of a cylindrical body having a concave portion 9 which is open at one end and a thicker closed end 10 at the other end.

The thick closed end 10 has a recess 9 at one end.
Then, a soft iron core 11 whose other end is exposed on the outer side surface is embedded therein. Note that the outer surface becomes a stud suction surface 12 as described later.

As shown in FIG. 3, the magnet 9 is accommodated in the recess 9 and the stud holder 8 having the magnet 13 incorporated therein is fitted to the socket holder 5. A ferrite magnet may be used for the magnet body 13. However, when a samarium cobalt magnet is used, a strong magnetic force can be obtained despite its small size.

In this way, the magnetic lines of force from the magnet body 13 are led out to the stud attracting surface 12 using the soft iron core 11 as a yoke, and are concentrated on the soft iron core 11 and have the same attractive force as directly contacting the magnet body 13. Is exerted on the end of the soft iron core 11 on the side of the stud suction surface 12, so that the stud 14 is
The stud is held by the stud holder 8 by this magnetic force, and the stud can be formed by the welding gun.

The stud 14 may be a stud having no bulging portion as shown by a solid line in FIG. 3 but may not be a stud having a swelling portion, as shown by a chain line.

FIG. 4 shows a second embodiment of the present invention. The closed end 10 'of the stud holder 8 is relatively thin, the concave portion 9' is deep, and the magnet body 13 is deep in the back. And sealed with ethoxy resin 15.

In the case of the second embodiment, the soft iron core 11 is not required, but the closed end 10 'is relatively thin, so that it is easily affected by wear, and the magnet body 13 receives welding heat. It is easy.

[0022]

As described above, the jig for stud welding according to the present invention expands the function of the socket holder of the conventional stud welding gun, and can be used with a short stud.
In addition, it is possible to easily and reliably set the welding gun on the welding gun even if it is not a stud with a head, so that the price of the stud itself can be reduced and the short stud affects the operation of the welding gun. It is easy to use without giving.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a stud welding jig of the present invention.

FIG. 2 is a side view showing a use state of the stud welding jig of the present invention in the first embodiment.

FIG. 3 is a side view showing a setting method in the first embodiment of the stud welding jig of the present invention.

FIG. 4 is a vertical sectional side view showing a second embodiment of the stud welding jig of the present invention.

FIG. 5 is a partially cutaway side view showing a conventional example.

FIG. 6 is a vertical sectional side view of the socket holder.

FIG. 7 is a front view of the socket holder.

FIG. 8 is a schematic explanatory view of stud welding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Welding power supply 2 ... Control device 3 ... Welding gun 4 ... Head stud 4a ... Head 5 ... Socket holder 6 ... Slit 7 ... Stopper 8 ... Stud holder 9,9 '... Recess 10,10' ... Closed end 11 … Soft iron core 12… Stud adsorption surface 13… Magnet 14… Stud 15… Epoxy resin

Claims (2)

(57) [Claims] 1. A stud holder made of a non-magnetic and conductive metal which is removably fitted into a socket holder of a welding gun instead of a stud head, and has a built-in magnet body.
A stud welding jig characterized by a closed end having a stud suction surface on an outer end. 2. The stud welding jig according to claim 1, wherein the closed end of the tip is thick, one end of which is joined to the magnet body, and the other end of which is embedded with a soft iron core leading to a stud suction surface.