JPH06102270B2 - Welding gun for arc stud welding - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding gun for arc stud welding for welding a stud material such as a stud bolt to a base material.

[0002]

2. Description of the Related Art A conventional welding gun for arc stud welding of this type is shown in FIG. This is provided with a stud material mounting chuck 2 on the front of the gun body 1,
A pair of gap-holding rods 3 are provided on both sides of the chuck 2, and as shown in the figure, after the stud material S is mounted on the chuck 2, the stud material S is made into a cartridge 5 made of a molten metal producing material. By pressing the stud material S and the base material 4 with an AC voltage applied between the stud material S and the base material 4, an arc generated between the stud material S and the base material 4 forms a molten pool between the stud material S and the base material 4. A spring (not shown) provided inside the gun body 1 pushes the tip of the stud material S into the molten pool via the chuck 2 to melt-inject the stud material S into the base material 5. To do.

[0003]

In the above conventional welding gun, the stud material S is attached to the chuck 2 provided at the front part of the gun body 1.
Therefore, when a long stud material S is attached, the gun body 1 and the base material 4 are attached.
Since the facing distance α between the base material 4 and the base material 4 becomes too large, the stud material S cannot be precisely and vertically welded to the base material 4. Therefore, this welding gun is limited in use when the short stud material S is to be implanted.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a welding gun for arc stud welding, which enables a long stud material to be accurately and vertically welded to a base material. .

[0005]

In order to achieve the above object, the first aspect of the present invention comprises a gun main body and a lid portion detachably fitted to the gun main body. A stud material fitting hole for fitting the stud material is formed on the surface, and a stud material engaging portion for engaging the stud material is fitted on the gun body side with the stud material fitting insertion hole interposed therebetween. In the gun body, a stud material pressing portion for pressing the stud material fitted in the stud material fitting insertion hole to the stud material engaging portion is provided on the lid side so as to be movable along the insertion hole. Is provided with a biasing means for biasing the stud material engaging portion toward the base material.

According to the second aspect of the present invention, the stud member contact surface of the stud member engaging portion is formed in a screw shape.

Further, in claim 3, the stud member engaging portion is
It is composed of a base and a stud member engagement main body that is detachably attached to the base.

Still further, according to a fourth aspect of the present invention, a chuck support tool for supporting the stud material mounting chuck is engaged with the stud material engaging portion.

[0009]

According to the first aspect of the present invention, the stud material is engaged with the stud material engaging portion provided on the gun body side with the lid portion opened, and the lid portion is fitted to the gun body. Only then, the stud material is pressed and engaged with the stud material engaging portion by the stud material pressing portion on the lid side, so that the stud material can be easily attached to the welding gun.

Moreover, at this time, the stud material is fitted into the stud material fitting hole formed in the fitting surface between the gun body and the lid, and the length of protrusion of the stud material from the welding gun can be freely adjusted. Since it can be adjusted to, the facing distance between the gun body and the base material can be set appropriately, and by this,
Even a long stud material can be precisely and vertically welded to the base material.

According to the second aspect of the present invention, the stud member contact surface of the stud member engaging portion is formed in a screw shape so that the stud member engaging portion can be securely engaged with the stud member. Therefore, when the stud material attached to the welding gun is pressed against the base material, the stud material does not slip and retract.

Further, according to the third aspect, the stud material engaging portion is composed of the base and the stud material engaging engaging portion main body which is detachably attached to the base. It is possible to mount various types of stud materials having different diameters on the welding gun simply by exchanging the engaging part body corresponding to the diameter of the stud material.

Still further, according to the fourth aspect, since the chuck support tool for supporting the stud material mounting chuck is engaged with the stud material engaging portion, even a short stud material can be used.
It can be attached to the welding gun by almost the same procedure as in the past.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a state in which a stud material S is welded to a base material 4 by a welding gun according to an embodiment of the present invention. The welding gun is shown in FIGS. As described above, the gun main body 6 and the lid portion 8 that is openably and closably fitted to the upper portion of the gun main body 6 via the hinge 7 are provided, and the fitting surface 9 of both of them has a stud material such as a stud bolt. A stud material fitting insertion hole 10 for inserting S is formed, and a stud material engaging portion 11 for engaging the stud material S on the gun body 6 side with the stud material fitting insertion hole 10 sandwiched therebetween. And the lid 8
The stud material pressing portion 12 for pressing the stud material S fitted into the stud material fitting hole 10 against the stud material engaging portion 11 is provided on the side, and the stud material engaging portion is further provided inside the gun body 6. A biasing device 13 (biasing means) for biasing the portion 11 toward the base material 4 is provided, and a locking device 14 for locking the fitted state of the lid portion 8 to the gun body 6 is provided.

As shown in FIG. 4, the stud material engaging portion 11 is provided with a base 11a movably disposed along the stud material fitting hole 10 in the gun body 6 and the base 11a. A projecting portion 6 that is integrally projected and integrally formed on the front portion of the gun body 6.
consisting of a semi-circular engagement part main body 11b arranged in a,
A loose fitting recess 15 into which the stud material S is loosely fitted in the base 11a.
Is formed.

As shown in FIG. 3, the stud member pressing portion 12 is formed integrally with the front portion of the lid portion 8 and is fitted to the protruding portion 6a of the gun body 6 on the inner surface of the protruding portion 8a. The stud material S is formed by a large number of pressing plates 12a that are integrally provided at predetermined intervals along the material fitting insertion hole 10. 11 is fitted into the engaging portion main body 11b and the loose fitting concave portion 15 and the lid portion 8 is fitted to the gun main body 6, and the stud material S is pushed by the stud material pressing portion 12 as shown in solid lines in FIGS. Since the stud material engaging portion 11 is pressed and engaged, the stud material S can be easily attached to the welding gun.

In addition, at this time, since the protruding length of the stud material S from the welding gun can be freely adjusted, the facing distance β between the gun body 6 and the base material 4 can be appropriately set. It is possible (see FIG. 1), and by this means, even the long stud material S can be accurately and vertically welded to the base material 4.

By engraving the threaded portion 16 on the inner surface of the engaging portion main body 11b, the stud material engaging portion 11 can be more firmly engaged with the stud material S, whereby the welding gun. When the stud material S mounted on the base material 4 is pressed against the base material 4, the stud material S does not slip back.

As shown in FIG. 7, the urging device 13 is provided with a movable block 18 movably arranged in the gun body 6 along the stud material insertion hole 10 and a protrusion on the base 11a. The guide rod 20 is provided and is movably inserted into the through hole 19 of the movable block 18, and the stud member is engaged by being wound around the guide rod 20 between the base 11a and the movable block 18. And a pressing spring 21 for urging the portion 11 toward the base material 4 side. As shown in FIG. 1, when the stud material S attached to the welding gun is pressed against the base material 4,
The stud material S is allowed to retreat to the welding gun side, and the stud material S can be pushed toward the base material 4 side by the urging force of the spring 21 when the cartridge 5 is melted during welding. .

In FIG. 7, 22 is attached to the gun body 6 so as to be rotatable only and has a tip screw portion 22a.
Is a biasing force adjusting knob screwed into a nut 23 provided on the movable block 18, and the movable block 18 is moved by rotating the knob 22 forward and backward to adjust the biasing force of the spring 21. You can do it. Further, 24 is a protrusion rod provided on the base 11a, and a detent rod 26 that is movably fitted in the fitting hole 25 of the movable block 18 is provided with a guide rod 20. The detent pin 28 that is movably fitted into a long hole 27 (see FIG. 3) formed along the stud material fitting hole 10 in the movable block 1 is a movable block 1.
8 is a stud material loose fitting concave portion formed in FIG.

As shown in FIG. 8, the lock device 14 is formed integrally with a lock plate 31 supported by the gun body 6 via a support pin 30 so as to be horizontally movable, and on the upper edge of the lock plate 31. A pair of lock pins 32 protruding from the lid 8,
A pair of substantially L-shaped lock claw portions 3 that are detachably engaged with 32.
3, 33, a lock spring 34 for urging the lock plate 31 in the lock direction, and a grip portion 6b formed integrally with the gun body 6, and the lower end portion of the support shaft 35 is attached to the grip portion 6b. The lock pin 36 is rotatably pivoted through the lock lever 36, and the engagement pin portion 36a provided at the upper end of the lock lever 36 engages with the long hole 37 formed in the lock plate 31.

In the above structure, the lock pins 32, 32 are formed on the lock claws 33, 33 only by fitting the lid 8 to the gun body 6 from the opened state (see FIG. 3) (see FIG. 2). By pressing the inclined surfaces 33a, 33a, the lock plate 31 retracts against the lock spring 34, and the lock pins 32, 32 and the lock claws 33, 33 engage with each other, so that the lid 8 The fitted state with the gun body 6 can be reliably locked.

From the locked state, simply pressing the lock release button 38 integrally provided on the lock lever 36 causes the lock lever 36 to be raised and the lock plate 31 to lock the spring, as shown by the phantom line in FIG. Since the lock claw portions 33, 33 and the lock pins 32, 32 are released from the locked state against 34, the lid portion 8 can be easily opened.

In FIG. 2, reference numeral 40 is a pair of distance maintaining rods projecting from the front portion of the gun body 6, 41 is an energizing push button,
Reference numeral 42 is a power supply cord.

To explain the procedure of welding, first, with the lid 8 open, a predetermined portion of the central portion of the stud material S is inserted into the stud material insertion hole 10 on the gun body 6 side, and the lid 8 is opened. The stud material S can be attached to the welding gun simply by fitting it to the main body 6.

Next, as shown in FIG. 1, the stud material S attached to the welding gun is pressed against the pressing spring 21 against a predetermined position of the base material 4 through the cartridge 5, and the energizing push button 4 is pressed.
Press 1. As a result, the AC voltage applied between the stud material S and the base material 4 causes an arc between them to form a molten pool, and the inner surface of the cartridge 5 is melted. The tip of the stud material S is pushed into the molten pool, and the stud material S is melt-planted in the base material 5.

Subsequently, the lock release button 38 is pressed to release the locked state of the lid portion 8 and the lid portion 8 is opened to remove the welding gun from the stud material S welded to the base material 4. Can be removed.

In the above embodiment, the base 11a of the stud member engaging portion 11 and the engaging portion main body 11b are integrally formed.
As shown in FIG. 9, both of them may be separately provided, and the engaging portion main body 11b may be detachably attached to the base 11a by the screw 44. As a result, various stud materials S having different diameters can be mounted on the welding gun simply by exchanging the engaging portion main body 11b corresponding to the diameter of the stud material S to be mounted.

Further, as shown in FIG. 10, the stud member engaging portion 11 is engaged with the screw portion 46a of the chuck support tool 46, and the support tool body 46b of the chuck support tool 46 is provided.
The chuck 4 for mounting the stud material is provided in the taper hole 47 formed in
The taper shaft portion 48a of No. 8 may be fitted and the stud material S may be mounted on the chuck body 48b of the stud material mounting chuck 48.

According to this structure, the short stud material S can be attached to the welding gun in a procedure substantially similar to the conventional procedure.

[0031]

According to the first aspect of the present invention, when the stud material is attached to the welding gun, the protruding length of the stud material from the welding gun can be freely adjusted, so that It is possible to properly set the facing distance between the base material and
Even a long stud material can be precisely and vertically welded to the base material.

According to the second aspect, the stud member contact surface of the stud member engaging portion is formed in a screw shape, and the stud member can be firmly attached to the welding gun. When the stud material is melted and implanted into the base material, the stud material does not slip and retreat, and the stud material can be reliably melted and implanted.

Further, according to the third aspect, the stud material engaging portion is composed of the base and the stud material engaging engaging portion main body which is detachably attached to the base. It is possible to mount various types of stud materials having different diameters on the welding gun simply by exchanging the engaging part body corresponding to the diameter of the stud material.

Further, according to the fourth aspect, since the chuck support tool for supporting the stud material mounting chuck is engaged with the stud material engaging portion, even a short stud material can be used.
It can be attached to the welding gun by almost the same procedure as in the past.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a state in which a stud material is welded to a base material by a welding gun as an embodiment of the present invention.

FIG. 2 is a perspective view of the gun.

FIG. 3 is a perspective view showing a state in which a lid portion of the gun is opened.

FIG. 4 is a perspective view of a stud member engaging portion used in the gun.

FIG. 5 is a partially cutaway side view of the gun.

6 is a view taken along the line AA of FIG.

FIG. 7 is a horizontal sectional view of the gun.

FIG. 8 is a partially cutaway side view showing a lock device used in the gun.

FIG. 9 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 10 is a horizontal cross-sectional view of a main part showing still another embodiment of the present invention.

FIG. 11 is a schematic explanatory view showing a conventional example.

[Explanation of symbols]

 4 Base Material 6 Gun Body 8 Lid 9 Fitting Surface 10 Stud Material Fitting Hole 11 Stud Material Engaging Part 11a Base 11b Engaging Part Main Body 12 Stud Material Depressing Part 13 Energizing Device (Energizing Means) 16 Screw Part 46 Chuck support tool 48 Chuck for mounting stud material S Stud material

Claims (4)

[Claims] 1. A gun body, and a lid part that is detachably fitted to the gun body, and a stud material fitting hole for fitting a stud material is formed in a mating surface of both of them. A stud material engaging portion that engages with the stud material is provided on the gun body side so as to be movable along the stud material fitting insertion hole with the stud material fitting insertion hole interposed therebetween, and the stud material fitting insertion portion is inserted on the lid side. A stud material pressing portion for pressing the stud material fitted in the hole to the stud material engaging portion is provided, and an urging means for urging the stud material engaging portion toward the base material is provided in the gun body. Welding gun for arc stud welding. 2. The welding gun for arc stud welding according to claim 1, wherein the stud member contact surface of the stud member engaging portion is formed in a screw shape. 3. The stud member engaging portion is composed of a base and a stud member engaging portion main body detachably attached to the base member. Welding gun for arc stud welding. 4. The welding gun for arc stud welding according to claim 1, wherein a chuck support tool for supporting the stud material mounting chuck is engaged with the stud material engaging portion.