JP2575078B2 - Stud welding gun with stud and ferrule holding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stud welding using a ferrule, in which a ferrule and a stud are individually and simply held at a predetermined position of a stud welding gun, thereby reducing the burden on an operator and easily and reliably. The present invention relates to a stud welding gun having a holding mechanism for studs and ferrules to be welded.

[0002]

2. Description of the Related Art When performing stud welding, an operator first holds a predetermined stud on a chuck of a gun, fits a ferrule on the stud, and abuts the stud at a predetermined position of a base material.

[0003]

However, in the conventional method, the ferrule is not held because the ferrule is simply inserted through the stud held on the chuck of the gun. Therefore, at the time of stud welding, the welding is performed by holding the welding gun with one hand and holding the ferrule inserted into the stud with the other hand so that the ferrule does not fall off, and hits the base metal at a predetermined position. For this reason, the burden on the operator during the welding operation is large, and automation is not possible.

[0004] It is an object of the present invention to reduce the work load on an operator and to perform reliable welding by holding a stud and a ferrule at a predetermined position on a welding axis of the gun by a welding gun.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the stud welding gun is provided with retainers for individually holding a stud and a ferrule on a welding shaft of the stud welding gun. In addition, the gist is that an opening / closing means for automatically opening / closing the cage is provided in each cage.

[0006]

[Function] Since the stud and the ferrule are individually and automatically held on the welding axis of the stud welding gun, and the respective holders are provided, the stud and ferrule are set respectively in the manual gun. Subsequent welding work is simplified, and the burden on the operator can be greatly reduced. Furthermore, semi-automatic or fully automatic operation is possible by moving the welding gun to a position of a stud and a ferrule placed at a predetermined position and automatically holding the welding gun at each holder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stud welding gun having a stud and a ferrule holding mechanism according to the present invention will be described below with reference to the illustrated embodiment. In the figure, 1 is a desired stud welding gun,
Reference numeral 2 denotes a gun operating rod protruding from the stud welding gun, and a stud backup stopper 3 is attached to the tip of the operating rod 2. The welding gun 1 may be a manual type as shown in FIGS. 1 and 2 or a semi-automatic or automatic type as shown in FIG.

A holder 4 for holding a stud is attached to the main body or the operating rod 2 of the welding gun 1. 1 and 2
In the embodiment, the retainer 4 is provided by a retainer 6 attached to the operating rod 2. In the embodiment shown in FIG. 8, the cage 4 is directly attached to the welding gun 1. How to attach this cage is not limited. The holder 4 is provided with two opposing arms 5 protruding therefrom, and holding pieces 5a, 5b each having a shape suitable for gripping a stud are integrally provided at the opposing ends of the arms 5, 5, The stud S gripped by the holding pieces 5a and 5b is
The shape of the arm and the shape and position of the holding piece are determined so as to be on the welding axis.

A ferrule retainer 7 is attached to the welding gun 1, and two opposing arms 8 are formed in a required shape to protrude therefrom, and the tips of the arms 8, 8 are positioned on the welding axis. At the same time, holding pieces 8a and 8b for gripping the ferrule are provided on the ferrule F, whereby the ferrule F is gripped.

[0010] The welding power source 9 is connected to a welding base material B and a stud holding holder 4 via a welding cable 10 to supply electric power required for stud welding.

As shown in FIGS. 6 and 7, the holders 4 and 7 for holding the stud S and the ferrule F are provided with a driving source 4S or 7 such as a pneumatic cylinder or a hydraulic cylinder.
Arm 5 or 8 via link L, L swinging at S
Of the arm, thereby causing the holding piece 5 at the tip of the arm to swing.
a, 5b or 8a, 8b can be opened and closed so that it can be adjusted according to the stud diameter and ferrule diameter for gripping it, and can be held with a required gripping force. Further, the drive source and the mechanism in the retainer are shown by way of example in the drawing, and are not limited to this mechanism, and motors, cams, and other mechanisms can be employed as long as they perform the same operation. .

Next, the operation of performing stud welding using the welding gun 1 shown in FIGS. 1 to 3 will be described. As shown in FIG. 1, the welding gun before welding has holding pieces 5a, 5b and 8a,
8b is in an open state, which is held by an operator by hand, or attached to a robot or an automatic device. As shown in FIG. 3, the required number of studs S and ferrules F used for welding are set in a state where the studs S are inserted into the ferrules F in the pallet P and assembled. This pallet P is arranged at a predetermined position within the range of movement of the welding gun.

Next, the welding gun 1 is moved to a position above the pallet P, and the studs S set in the pallet P are set.
When the gun 1 is stopped after stopping above the center line, the stud S is inserted between the opened holding pieces 5a and 5b, and the ferrule F is inserted between the opened holding pieces 8a and 8b. become. Next, when operating air or hydraulic pressure is supplied to the holders 4 and 7 to operate the drive source in the holders, the holding pieces 5a and 5b opposed to each other via the arms 5 and 8 and between the opened holding pieces 5a and 5b and 8a , 8b, whereby the stud S and the ferrule F are gripped at a predetermined required pressure. At this time, the stopper 3 at the tip of the operating rod is in contact with the stud S, and the stud S ferrule F
Is held on the welding line of the welding gun 1.

With the stud S and the ferrule F held, the welding gun 1 is raised, and then moved to a welding position.
The welding gun is again brought into contact with the base metal by lowering and contacting the base metal. This welding is performed in the same manner as in the prior art, and the operating rod 2 is pulled up by the electromagnet contained in the welding gun 1. At this time, the stud holder 4 fastened to the operating rod is also pulled up at the same time, so that the stud S is also lifted. The welding current flows from the holding piece through the stud to the base material B to generate an arc. After a certain period of time, if the current of the electromagnet is cut off, the operating rod moves in the base material direction and the stud is moved. Is pressed against the base material and the welding current is stopped at the same time, and the welding is completed.

Thereafter, the holding pieces 5a, 5b and 8a, 8b
The gap is opened to raise the welding gun 1 and then moved onto the front pallet P, and this operation is sequentially repeated to perform semi-automatic or automatic stud welding.

The embodiment shown in FIG. 4 to FIG.
FIG. 1 shows an integrated type in which holders 4 and 7 for a stud and a ferrule are integrally incorporated, which is suitable for mounting on a robot or an automatic device. The integrated welding gun 1 is fixed to a base 11 and disposed via a cylinder 13 between the welding gun 1 and a base 12 attached to a robot or the like.
The other components and operations are the same as those of the embodiment shown in FIGS.

The function of the welding gun 1 is the same in the embodiment shown in FIGS. 1 and 2 and in the embodiment shown in FIGS. 4 to 8, which are the core 14, the coil 15 and the spring for pressing the stud of the electromagnet for pulling the operating rod. 16 and a cylinder 17 are provided, and when the electromagnet is opened, these move toward the base material by a spring. When the stud length changes,
The position of the stopper 3 can be changed by the cylinder stroke corresponding to this length. For example, when using one cylinder, the position of the stopper 3 can be changed, and when using two cylinders, the position of the stopper 3 can be changed. The position can be changed.

The drive source of the holder 5 for holding the stud is mounted on the cylinder holder 18, and the drive source of the holder 7 for holding the ferrule is mounted outside the gun 1. The movements of the retainers 5 and 7 are shown in FIG.
Operate in the -B direction.

[0019]

According to the present invention, a stud welding gun provided with a stud and ferrule holding mechanism is provided with a holder for individually holding a stud and a ferrule on a welding shaft of the stud welding gun. The opening / closing means for automatically opening / closing the cage is provided in each cage, so that the loading of the stud and the ferrule to the gun becomes easy, the accuracy of the relationship between the stud and the ferrule (centering) is improved, and the loading speed is high. As a result, the burden on the worker is reduced, and the working time is also reduced. Further, in the case of automation, there are advantages that it can be more easily handled than before, and that high accuracy and high efficiency can be achieved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a stud welding gun provided with a stud and a ferrule holding mechanism of the present invention.

FIG. 2 is a front view of the stud and the ferrule holding state.

FIG. 3 is an explanatory diagram of a state where a stud and a ferrule are combined.

FIG. 4 is an explanatory diagram of a second embodiment.

FIG. 5 is a side view with the same part broken.

FIG. 6 is an explanatory diagram of a stud retainer.

FIG. 7 is an explanatory diagram of a ferrule holder.

8 is an external perspective view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding gun 2 Operating rod 4,7 Cage 5,8 Arm 5a, 5b Stud holding piece 8a, 8b Ferrule holding piece S Stud F Ferrule

Claims (1)

(57) [Claims] A stud and a ferrule are separately provided on a welding shaft of the stud welding gun. Each of the stud welding guns is provided with an opening and closing means for automatically opening and closing the holder. A stud welding gun provided with a stud and a ferrule holding mechanism, characterized by being provided.