JP2000326071A - Chuck for graspin stud of stud-welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To poke out a stud at a single-action operation, which is left over in a chuck after welding, in the chuck holding the stud having a neck part. SOLUTION: A chuck main body 4 is formed into a cylindrical shape, and a stud-holding part 3 is provided at the opening part of the tip of the chuck main body 4. A poke-out bar 5 is inserted through on the axial line of the chuck main body 4 in the stud holding part 3, so that the tip of the pushing-out bar 5 goes in and out freely. The poke-out bar 5 is moved in the axial line direction by an operation part 7 from the outside of the chuck main body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck for holding a stud, which has a neck portion at a tip end of the stud, which is separated from the neck portion after welding, and removes a stud residue in the chuck after welding. It relates to an object that can efficiently protrude to the outside.

[0002]

2. Description of the Related Art In FIG. 4, a proposal has been made in which a pair of metal plates 13 are welded to each other via a dowel 12 to form a wall surface or the like. To make this wall,
First, the end of the dowel 12 is stud-welded to one metal plate 13, the head thereof is aligned with the hole of the other metal plate 13, and the neck 2
The hole of the metal plate 13 and the head of the dowel 12 can be welded by the stud 2 with a. The stud 2 after the welding has its tip 2b separated from the neck 2a, and the remaining stud and the arc shield 11 are held in the chuck. Such residual studs and arc shields 11
Was very hot after welding, so it had to be removed in the axial direction with an appropriate tool.

[0003]

When a stud having a neck portion is used in a conventional chuck for holding a stud, there is a disadvantage that the removal of the remaining stud is troublesome. Therefore, an object of the present invention is to provide a chuck that can solve such a problem and can perform stud welding quickly.

[0004]

According to the present invention, there is provided a stud holding chuck attached to a front end of a stud gun and elastically holding an outer periphery of a rear end of the stud. And a chuck body 4 having a stud grip portion 3 formed at the opening at the tip end thereof, and the chuck body 4 is inserted through the axis of the chuck body 4 so that the tip end can freely enter and exit the stud grip portion 3. A protruding rod 5, an operation slit 6 formed along the axis on the outer periphery of the chuck body 4, and inserted through the operation slit 6,
A stud gripping chuck for a stud welding machine, comprising: an operating portion 7 connected to the protrusion bar 5 and protruding outside the chuck body 4.

According to a second aspect of the present invention, in the first aspect, a coil spring 8 is interposed between the projecting bar 5 and the chuck body 4, and the projecting bar 5 is attached to the rear end side. 7 is a chuck for holding a stud of a stud welding machine formed so as to be biased.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a chuck for holding a stud of the present invention, FIG. 2 is a side view thereof, and FIG.
Is a bottom view of the same. 4 is an explanatory view of welding the metal plate 13 and the head of the dowel 12 using the chuck. FIG. 5 is a schematic sectional view taken along the line VV of FIG. 4, and FIG. FIG. This chuck grips a stud 2 having a neck 2a as shown in FIG. Such a stud 2 is capable of melting and joining a tip portion 2b at the time of welding, and automatically separating a preceding portion from other portions by the presence of a neck portion 2a. For example, in the case where the dowel 12 is joined between the pair of metal plates 13 in FIG. 4, the stud 2 is used to stud weld between the head of the dowel 12 and the hole of the metal plate 13, and as shown in FIG. 13 and the head of dowel 12 are joined.

At the same time as the completion of the joining, the molten portion is separated from the rest of the stud 2, and the stud welding is completed with almost no projecting portion on the surface of the metal plate 13. Next, after the welding is completed, the operation unit 7 is moved downward, so that the chuck body 4 is
And the arc shield 11 held at the tip of the stud 2 can be simultaneously projected. For this purpose, the stud holding chuck of the present invention is configured as shown in FIGS. The chuck for holding the stud is made of a metal material, and has a chuck body 4 formed in a cylindrical shape and a protruding rod 5 inserted therein. In this example, the chuck body 4 is formed by screwing up and down two members for convenience in assembling parts. The upper member is formed with a stepped outer diameter, and the tapered portion 21 is formed on the small diameter side to form a large. A pair of operation slits 6 are provided on the radial side and are separated from each other by 180 ° in the circumferential direction. In the lower half portion of the chuck body 4, four slits 17 are arranged at 90 ° intervals in the circumferential direction below the middle portion thereof, and each is formed parallel to the axis.

Next, the projecting bar 5 is also composed of a three-membered screw body consisting of a lower member, an intermediate member and an upper member, also for convenience in assembling parts, and the upper member forms the spring guide 19. The spring guide 19 is formed in a bolt shape having a head. The upper end of the coil spring 8 is fixed to the head, and the lower end is seated on the bottom surface of the opening of the tapered portion 21. As a result, the entire projecting rod 5 connected to the spring guide 19 is urged upward. Also, the protruding rod 5
The operation part 7 penetrates the intermediate member, and is inserted into the operation slit 6 of the chuck body 4. Further, an E-ring 20 is attached to the operation unit 7, thereby preventing the operation unit 7 from coming off.

The stud gripping chuck of the present invention thus constructed has a tapered portion 21 at the upper end thereof fitted and fixed to the tip of the stud gun 1 as shown in FIG. Then, the upper end of the stud 2 is elastically fitted to the stud grip 3 at the tip of the chuck body 4. In this example, the stud gun 1 has a switch push rod for supplying an inert gas.
A gas shield 9 having 18 is attached, which fits around the outer periphery of the chuck body 4. A gas pipe 15 communicates with the gas shield 9, and a switch 10 and a switch push rod 18 are provided at the communication portion. And chuck body 4
A shield gas ejection part 22 is opened in the vicinity of the outer periphery of the lower part. An arc shield holding cylinder 16 is held in the opening of the gas shield 9 via mounting bolts 23. The arc shield holding cylinder 16 has a plurality of slits 16a formed below the middle portion thereof, and the upper end of the arc shield 11 is elastically held therein.

[0010]

Next, a method of using the chuck for holding a stud according to the present invention will be described. As shown in FIG.
The stud 2 is held at the tip of the stud. This stud 2
It has a tip 2b and a neck 2a. An electrode / flux 14 protrudes from the end face of the tip 2b. In this example, first, the lower end of the dowel 12 is fixed to the lower metal plate 13 of the pair of metal plates 13 by stud welding. A large number of such jewels 12 are erected and fixed to the lower metal plate 13 at regular intervals. Next, a hole previously drilled in the upper metal plate 13 is positioned at the head of the dowel 12. Then, the arc shield 11 is gripped by the arc shield holding cylinder 16, the stud 2 is gripped by the chuck body 4, and the axis of the stud gun 1 is aligned with the center of the dowel 12. Then, the tip of the switch push rod 18 comes into contact with the plane of the metal plate 13, which moves upward to open the switch 10. Then, a shielding gas is supplied inside.

Next, the switch of the stud gun 1 is turned on.
I do. Then, electricity flows between the stud 2 and the dowel 12, and the stud 2 is lifted slightly upward. Then, a discharge is generated between the tip of the stud 2 and the surface of the head of the dowel 12, and they are melted, and the metal plate 13 and the head of the dowel 12 are integrally welded and fixed as shown in FIG. . Then, the stud gun 1 is lifted upward, and then the operation unit 7 is moved downward. Then, the tip of the protruding bar 5 protrudes the stud 2 and the arc shield 11.

[0012]

According to the first aspect of the present invention, the stud 2 separated from the neck portion 2a after the stud welding and remaining in the chuck body 4 is operated by operating the operating portion 7.
It can be pushed out of the chuck body 4 via the push rod 5 with one touch. Thereby, stud welding with good workability can be performed. According to the second aspect of the present invention, since the coil spring 8 is provided between the projecting bar 5 and the chuck body 4 to urge the projecting bar 5 to the rear end side, the remaining stud 2 Can be automatically returned after projecting the stud, and a stud gripping chuck with better operability can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a chuck for holding a stud of a stud welding machine according to the present invention.

FIG. 2 is a side view of the chuck.

FIG. 3 is a bottom view of the chuck.

FIG. 4 is an explanatory view of welding the metal plate 13 and the head of the dowel 12 using the stud holding chuck of the stud welding machine of the present invention.

FIG. 5 is a schematic cross-sectional view taken along the line VV of FIG. 4;

FIG. 6 is an explanatory view of protrusion of a remaining stud after welding the metal plate 13 and the head of the dowel 12 using the chuck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stud gun 2 Stud 2a Neck 2b Tip 3 Stud gripping part 4 Chuck body 5 Protruding rod 6 Operating slit 7 Operating part 8 Coil spring 9 Gas shield 10 Switch 11 Arc shield 12 Dowel 13 Metal plate 14 Electrode and flux 15 Gas piping 16 Arc shield holding cylinder 16a Slit 17 Slit 18 Switch push rod 18a Support shaft 19 Spring guide 20 E-ring 21 Taper section 22 Shield gas ejection section 23 Mounting bolt

Claims (2)

[Claims] 1. A stud gripping chuck which is attached to the front end of a stud gun 1 and elastically grips the outer periphery of the rear end of the stud 2. The stud holding chuck 3 is formed in a tubular shape and has a stud holding portion 3 at its front end opening. A protruding rod 5 inserted on the axis of the chuck body 4 so that the tip thereof can freely enter and exit the stud grip portion 3. And an operating portion 7 inserted through the operating slit 6 and connected to the protruding rod 5 and protruding outside the chuck body 4. Stud chuck for stud welding machine. 2. The stud according to claim 1, wherein a coil spring 8 is interposed between the projecting bar 5 and the chuck body 4 so as to bias the projecting bar 5 toward the rear end. Chuck for holding stud of welding machine.