JP2539228Y2 - Arc stud welding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a plurality of openable and closable levers, an arc shield holding portion attached to an end of each lever, and a cylindrical arc shield formed by dividing into a plurality of each. And an arc shield split body held by each of the arc shield holding portions.

[0002]

2. Description of the Related Art In arc stud welding, a cylindrical arc shield (ferrule) 2 is conventionally used as shown in FIG. When the stud 4 is welded to the material 6 to be welded, the arc shield 2 is fitted to the stud 4 as shown in the drawing to cover the welded portion of the stud 4 (the lower end of the stud 4). Shut off the weld from outside air.

As an example of arc stud welding using the above-mentioned arc shield, for example, as described in JP-A-59-141379 and JP-A-60-181269, a plurality of cylindrical arc shields are used. The two arc shield divided bodies are held by a welding machine so as to be able to approach and separate from each other, and the two arc shield divided bodies are brought close to each other and abutted to form a cylindrical arc shield. As shown in FIG. 6, a method of performing arc stud welding by covering the welded portion of the stud with the arc shield, and separating the arc shield from the welded stud by separating the two arc shield divisions after welding is proposed. I have. According to such a method, arc stud welding can be repeatedly performed a plurality of times by the same arc shield.

FIG. 7 shows an example of an arc stud welding machine using a plurality of divided arc shields as described above.
The following can be considered. The illustrated arc stud welding machine opens and closes by turning the handle 10 up and down.
An arc shield holder 14 is attached to the lower end of the lever 12, and each of the arc shield holders 14 holds an arc shield split body 16. The arc shield split body 16 has a substantially semi-cylindrical shape as shown in FIG. 1 described below. The arc shield holding portion 14 is fixed to the lever 12 by being vertically held by a step 12a of the lever 12 and a nut 18 screwed to a lower end of the lever 12.

[0005] Arc stud welding by the above welding machine is performed as follows. First, the handle 10 is turned upward from the position shown by the solid line in FIG.
By doing so, the two levers 12 are opened to the open state shown by the broken lines, and then the head of the stud 4 is gripped by the chuck 22 provided at the tip of the welding gun 20. Next, the handle 10 is pivoted downward so that both levers 12
Is closed to return to the original closed state shown by the solid line. In this closed state, the two arc shield split bodies 16 are in contact with each other to form a cylindrical arc shield, and the stud 4 is inserted into the arc shield. Subsequently, the welding machine is lowered from this state, and the lower end of the stud 4 and the lower end of the arc shield split body 16 are brought into contact with a predetermined position of the workpiece 6 to perform welding. After welding is completed, the handle 10 is rotated upward to open the lever 12, and thereafter, arc stud welding is repeated in the same manner.

[0006]

By the way, in the welding machine as described above, the two arc shield divisions 16 are at the same height position, that is, the distance from the base 24 of the welding machine to the lower end face of the arc shield division 16. L so that L is the same
Must be attached to 12. This is because if the mounting height positions of the two arc shield split bodies 16 are different, the height positions of the lower end faces of the two arc shield split bodies 16 brought into contact with each other at the time of welding are different. The lower end surface of the body 16 cannot be brought into close contact with the upper surface of the material 6 to be welded. For example, a gap is formed between one lower end surface and the upper surface of the material 6 to be welded.
This is because outgassing from 26 becomes non-uniform, which has an adverse effect on the formation of excess metal.

Further, it is necessary that the lower end face of the arc shield split body 16 and the lower end of the stud 4 attached to the chuck 22 have an appropriate height positional relationship set in advance. This is because if they are not in an appropriate height positional relationship, when the two arc shield split bodies 16 are brought into contact with each other at the time of welding and their lower end surfaces are brought into close contact with the upper surface of the material 6 to be welded, the arc shields are not covered. Upper surface of welding material 6 and stud 4
This is because the height and the positional relationship with the lower end may not be appropriate, and as a result, good arc stud welding may not be performed.

As described above, both arc shield divisions 16 need to be located at the same height and also at a predetermined height in relation to the stud 4.

However, in the welding machine as described above, the arc shield split body 16 is provided with the arc shield holding portion.
14 and the arc shield holder 14
Also, the stepped portion 12a and the nut 18 are uniquely attached to the lever 12, so that the mounting height position of the arc shield split body 16 is the dimensional accuracy of the lever 12, the arc shield holding section 14 and the arc shield split body 16. Depending on their dimensional accuracy, the mounting height positions of the two arc shield splitters 16 may not be the same, or the arc shield splitter 16 and the stud may be different depending on the dimensional accuracy of the above-mentioned parts and the dimensional accuracy of the stud 4. 4 may not be in an appropriate positional relationship set in advance.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an arc stud capable of always setting an appropriate mounting height position of an arc shield split body regardless of the dimensional accuracy of parts and studs of the welding machine. It is to provide a welding machine.

[0011]

In order to achieve the above object, an arc stud welding machine according to the present invention comprises: (1) a plurality of openable and closable levers, and an arc shield holding portion attached to an end of each lever. An arc stud welding machine comprising: a cylindrical arc shield divided into a plurality of pieces; each being formed by dividing an arc shield into a plurality of pieces, each of which is held by each of the arc shield holding sections. A lever insertion hole for inserting the end of the lever, a plate-shaped slit connected to the lever insertion hole in a plan view and extending a predetermined length in the longitudinal direction of the lever insertion hole, Pressing means for pressing the slit opposing portions opposing each other across the slit in a direction to approach each other is provided, and a lower end portion of the lever is inserted into the lever insertion hole. Type, characterized in that the arc shield holding portion by pressing in the direction to close to each other the slit facing portion is attached to the lever by the pressing means.

[0012]

In the arc stud welding machine, as described above, the end of the lever is inserted into the slit-inserted lever insertion hole of the arc shield holding portion, and the slit pressing portions are pressed by the pressing means in the direction of approaching each other. Thus, the arc shield holding portion is attached to the lever. By the pressing by the pressing means, the end of the lever is pressed and held by the entire lever insertion hole via the slit-facing portion. In such a structure, the length of insertion of the lever into the lever insertion hole can be arbitrarily set.

Therefore, according to the arc stud welding machine, the mounting position of the arc shield holding portion with respect to the lever,
As a result, the mounting height position of the arc shield split body can be arbitrarily set and adjusted, so that the mounting height position of the arc shield split body is always appropriate regardless of the dimensional accuracy of the welding machine or stud. It can be.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an arc shield split body used in an embodiment of an arc stud welding machine according to the present invention. Arc shield split 30 shown
Is formed by dividing a substantially cylindrical arc shield made of ceramics having excellent thermal shock resistance into two, each of which has a substantially semi-cylindrical shape.

On the lower surface of the arc shield split body 30,
A plurality of communication grooves 32 having a predetermined opening area for communicating gas between the inside and outside of the arc shield at the time of welding to perform degassing are formed,
The inner surface 34 forms a stud insertion hole slightly larger than the outer diameter of the stud 80 as shown in detail in FIG. A concave portion 38 for holding the shield holding portion is formed.

FIG. 2 shows an embodiment of the present invention, in which an arc stud welding machine for performing arc stud welding using the arc shield split body 30 is shown. FIG. 3 is a right side view of the welding machine shown in FIG. FIG.

The illustrated welding machine 42 includes a base 44, a pair of levers 50 rotatably supported by fulcrum pins 48 on two legs 46 fixed to the base 44, and a pair of levers 50. One end of the link 50 is rotatably connected to the upper end of the lever 50 via a joint pin 52, and the other end is rotatably connected to the upper end of the lever 50 via a joint pin 54. A handle 58 fixed to one end and extending in the left-right lateral direction (the direction of arrow B in FIG. 2) and a joint pin 54 connecting the other ends of the two links 56 are inserted through and up and down (the direction of arrow C in FIG. 2).
Elongate hole member having an elongate hole 60 extending therethrough and fixed to the base portion 44
62, a welding gun 66 attached to a pair of rods 64 erected on the base 44, a chuck 68 for holding the head of a stud 80 provided at the lower end of the welding gun 66, A welding machine body comprising a handle 70 having a welding switch 69 provided on the welding gun 66 is also provided.

An arc shield holder 72 is detachably attached to the lower end of each lever 50 of the welding machine main body.
30 are held respectively. The lever 50 can be opened and closed as shown by a broken line in the figure, and the opening and closing of the lever 50 is performed by rotating the handle 58 in the vertical direction.

The arc stud welding by the welding machine 42 is performed as follows. First, the handle 58 is pivoted upward from the position shown by the solid line in FIG. 2 to the position shown by the broken line, thereby opening the two levers 50 to the open state shown by the broken line.
Grab 80 head. Next, the handle 58 is rotated downward, thereby closing both levers 50 to return to the original closed state shown by the solid line. In this closed state, each lever 50
The arc shield holding portions 72 provided in the abutting each other, the arc shield split bodies 30 also abut each other to form a cylindrical arc shield, and a state in which the stud 80 is inserted in this arc shield. Has become. Subsequently, from this state, the welding machine 42 is lowered to bring the lower end portion of the stud 80 and the lower end surface of the arc shield split body 30 into contact with a predetermined position of the workpiece 82, and the switch 69 is pressed to perform welding. . After welding is completed, the handle 58 is rotated upward to open the lever 50, and thereafter, arc stud welding is repeated in the same manner.

Next, mounting of the arc shield holding portion 72 on the lever 50 and holding of the arc shield split body 30 by the arc shield holding portion 72 will be described with reference to IV-I in FIG.
This will be described in detail with reference to FIG. 4 which is an enlarged view taken along line V and FIG. 5 which is a sectional view taken along line VV in FIG.

The arc shield holding section 72 includes a holding section main body 74 and a holding body 76. The holding part body 74 is
It is attached to a lever 50 which is a part of the welding machine body so that the attachment position can be adjusted. That is, the holding portion main body 74 has a lever insertion hole 90 penetrating vertically for inserting the lower end portion of the lever 50, and the lever insertion hole 90 when viewed in plan view, that is, when viewed from above the longitudinal direction of the lever insertion hole 90. And a plate-like slit 92 extending a predetermined length in the longitudinal direction of the lever insertion hole 90, and the slit 92 of the arc shield holding portion 72.
Pressing means 94 is provided for pressing the slit facing portions 74a, 74b facing each other across the opening in a direction to approach each other.

In the present embodiment, the pressing means 94 includes a screwless through hole 94 formed in one of the slit facing portions 74a.
a, a female screw hole 94b formed in the other slit facing portion 74b, and a head screw 94c inserted into the screwless through-hole 94a and having a distal end screwed into the female screw hole 94b. I have.

The lever of the arc shield holding section 72
To attach to the 50, insert the lower end of the lever 50 into the lever insertion hole 90 of the arc shield holding part main body for a predetermined length,
Thereafter, the head screw 94c is rotated forward to press the slit opposing portions 74a, 74b in a direction of approaching each other, so that the lower end of the lever 50 in the entire lever insertion hole 90 through the slit opposing portions 74a, 74b. This is performed by pressing and holding the portion. The arc shield holding portion 72 is detached from the lever 50 by the head screw 94c.
Is rotated backward to release the pressing of the slit facing portions 74a, 74b.

The arc shield holding portion main body 74 has a convex portion 74c formed on the inner side surface 74a for fitting the concave portion 38 of the arc shield split body. The convex portion 74c of the arc shield holding portion is fitted into the concave portion 38 of the arc shield split body 30, and a holding member 76 fixed to the holding portion main body 74 by a screw 76a is provided on the upper end surface 30a of the arc shield split body. It is arranged. That is, the arc shield divided body 30 is formed on the upper surface of the concave portion by the arc shield holding portion 72.
38a and the upper end surface 30a of the arc shield split
The holding member 74c is held vertically by a holding member 74c.

As shown in the figure, the arc shield split body 30 is positioned such that the lower end face of the arc shield split body 30 projects downward by a predetermined length h from the lower end face of the arc shield holding portion 72. Is held. In this embodiment, the predetermined length h is set to 0.3 to 0.7 mm.

In this embodiment, the height (vertical length) of the concave portion 38 is set slightly larger than the height of the convex portion 74c so that a gap is formed between the two. I have. By doing so, even if the holding part main body 74 is made of metal and thermally deformed from a high temperature during welding, the thermal deformation is absorbed by the gap, thereby cracking the arc shield split body 30 due to the thermal deformation of the holding part main body 74. Generation can be prevented.

In the arc stud welding machine, as described above, the attachment of the arc shield holding portion 72 to the lever 50 is performed by inserting the lower end of the lever 50 into the lever insertion hole 90 of the arc shield holding portion. The lower end of the lever 50 is pressed and clamped by the entire lever insertion hole 90 via the head screw 94c, and the insertion length of the lower end of the lever 50 into the lever insertion hole 90 can be set arbitrarily. It is possible. Therefore, in the arc stud welding machine, the mounting position of the arc shield holding portion 72 with respect to the lever 50, and thus the mounting height position of the arc shield split body 30, can be arbitrarily set and adjusted. Regardless of the dimensional accuracy of the stud or the stud, the mounting height position of the arc shield divided body 30 can be made appropriate in any case.

In the above embodiment, the slits 92 are provided so as to cross the lever insertion hole 90 on both sides thereof. That is, the slit 92a located outside the lever insertion hole 90 and the slit 92a Slit section 92 located at
b, the slit 92 may be at least connected to the lever insertion hole 90, and may be, for example, only the outer slit 92a. Further, the head screw 94c is an example of the pressing means in the present invention, and it is also possible to adopt other than the head screw as the pressing means.

[0029]

[Effect of the Invention] The arc stud welding machine according to the present invention is:
As described above, the attachment of the arc shield holding portion to the lever is performed by inserting the end of the lever into the lever insertion hole of the arc shield holding portion, and connecting the end of the lever with the lever insertion hole via the pressing means. Since the clamping and pressing are performed, it is possible to arbitrarily set and adjust the mounting height position of the arc shield divided body with respect to the lever. Therefore, the mounting height position of the arc shield divided body is appropriately set in any case. can do.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arc shield split body used in an embodiment of an arc stud welding machine according to the present invention.

FIG. 2 is a front view showing an embodiment of the arc stud welding machine according to the present invention.

FIG. 3 is a right side view showing an embodiment of the arc stud welding machine according to the present invention.

FIG. 4 is a view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a diagram illustrating arc stud welding using an arc shield.

FIG. 7 is a front view showing a comparative example of an arc stud welding machine.

[Explanation of symbols]

 30 Arc shield split body 50 Lever 72 Arc shield holding part 90 Lever insertion hole 92 Plate slit 94 Pressing means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Namiki 1-90, Shimotakano, Sugito-machi, Kita-Katsushika-gun, Saitama JP-A-3-23072 (JP, A) JP-A-3-155472 (JP, A) JP-A-59-94779 (JP, U) JP-B-2-19752 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] A plurality of openable and closable levers, an arc shield holding portion attached to an end of each lever, and a cylindrical arc shield divided into a plurality of parts, each of which is provided with the arc shield holding part. An arc stud welding machine comprising: an arc shield split body held by a part; wherein the arc shield holding part includes a lever insertion hole for inserting an end of the lever, and a lever insertion hole in plan view. And a plate-shaped slit extending a predetermined length in the longitudinal direction of the lever insertion hole, and pressing means for pressing in a direction in which the slit opposing portions of the arc shield holding portion opposing each other with the slit interposed therebetween are brought closer to each other. And
An arc stud wherein the lower end of the lever is inserted into the lever insertion hole, and the arc shield holding portion is attached to the lever by pressing the slit opposing portions toward each other by the pressing means. Welding machine.