JP2834964B2 - Ferrule support device for stud welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferrule support device for holding a ferrule fitted to the tip of a stud reinforcing bar or a steel rod (hereinafter simply referred to as a stud reinforcing bar) against a welding partner in a stud welding machine. is there.

[0002]

2. Description of the Related Art In a stud welding method, a sheath cylindrical body made of a heat-resistant porcelain, which is a ferrule, is fitted to a welded end of a stud reinforcing bar as a means for shielding an arc and a mold of a molten metal.

As disclosed in Japanese Patent Application Laid-Open No. 4-157070, in a conventional stud welding machine, a holding plate is provided at a tip end of an arm projecting forward of a welding machine body,
The ferrule fitting with the base end of the ferrule fitted
The spring is inserted between the holding plate and the spring, and is urged forward, so that the front end surface of the ferrule is pressed against the steel plate surface of the welding partner.

Thus, a cavity for forming a weld bead is defined between the inner space of the ferrule and the surface of the steel plate. According to recent studies by the inventors, high-quality stud welding is efficiently performed. For that purpose, it is not enough to secure the bead forming cavity and to perform arc shielding by pressing and supporting the ferrule, and it has been found that the cooling rate of the molten metal is also important.

[0005] From this viewpoint, the conventional ferrule supporting device is reconsidered. Since the contact area between the ferrule fitting and the ferrule is extremely limited only to the base end of the ferrule, the contact area between the ferrule and the ferrule fitting and the arm is limited. Heat conduction was not so much expected, and the cooling of the weld metal had to rely on heat conduction to the stud rebar body and the steel plate body and heat radiation to the surrounding air.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is not only to secure an arc shield and a bead forming cavity, but also to increase a cooling rate of a weld metal ,
An object of the present invention is to provide a ferrule supporting device capable of preventing dripping of molten metal .

[0007]

Means for Solving the Problems Hereinafter, description will be made using reference numerals in the accompanying drawings, and the features of the present invention will be described.
Is connected to a support plate 3 having a large thickness and good thermal conductivity at the tip of an arm 2 projecting forward from the welding machine body 1, and the thickness direction of the support plate 3 matches the axial direction of the ferrule 4. The support plate 3 is provided with a receiving groove 6 into which the entire length of the main body portion 5 of the ferrule 4 is fitted, so that the main body portion 5 of the ferrule 4 comes into close contact.
Is formed along the outer peripheral surface 8 of the main body portion 5 and a ferrule support device in a studder welding machine for urging the ferrule 4 forward toward a welding partner by pressing means.
In this case, the pressing means of the ferrule 4 is
And the spring 13, and the back of the support plate 3.
Place the holding plate 9 on the surface side, and
The receiving groove 11 into which the part 10 is fitted is set in the holding plate 9.
And a guide pin 14 parallel to the axial direction of the ferrule 4.
Arrange a plurality of guide pins around the receiving groove 6 and press the guide pins 14
The back of the support plate 3 is inserted through the through hole 15 of the plate 9
Between the main body part 5 and the base end part 10 of the ferrule 4.
The holding plate 9 contacting the shoulder 12 of the step
Between the enlarged head 16 of the pin 14 and the back of the holding plate 9
Is urged forward by the spring 13 inserted into the
is there.

[0008]

When used in a horizontal stud welding machine, the main part 6 of the ferrule 4 fitted to the tip of the stud reinforcing bar 17 is fitted into the receiving groove 6 of the support plate 3 from the upper opening, and the outer peripheral surface 8 The lower half is in close contact with the bottom of the receiving groove 6. Since the spring 13 presses the ferrule 4 via the holding plate 9, the ferrule 4 moves forward by being guided by the receiving groove 6 of the support plate 3, and the tip end surface of the ferrule 4 is pressed uniformly against the surface of the steel plate 18 to be welded. Can be

When an arc discharge is performed according to a known method, molten metal is stored in a bead forming cavity defined between the inner space of the ferrule 4 and the steel plate 18.
The pushing operation of the stud reinforcing bar 17 is performed in a first stage until reaching the molten pool surface and in a second stage beyond the molten pool surface to a required depth, or a single stage through the molten pool surface to the required depth. This is done in action.

The cavity is filled with a necessary and sufficient amount of molten metal by a pushing operation of the stud reinforcing bar 17, and a weld bead 19 is formed by subsequent cooling. This cooling is in addition to the heat conduction to the stud reinforcing bar 17 and the steel plate 18 to be welded and the heat radiation to the surrounding air, the heat conduction to the support plate 3 which is in close contact with the main body portion 5 of the ferrule 4, and the heat radiation to the surrounding air. To obtain a cooling curve useful for good bead formation. At the stage where the ferrule 4 has been cooled to the required temperature, the ferrule 4 is broken and removed.

[0011] In this way the support plate 3 thermal conductivity is good and thick plate thickness thickness direction coupled to the arm 2 so as to match the axial direction of the ferrule 4, fitted the overall length of the body portion 5 of the ferrule 4 A receiving groove 6 is provided in the support plate 3, and a bottom surface portion 7 of the receiving groove 6 is formed along the outer peripheral surface 8 of the main body portion 5 so that the main body portion 5 of the ferrule 4 is in close contact with the ferrule 4 .
In addition to fixing the ferrule 4 so as not to move by the pressing means, the support plate 3 wrapping the main body portion 5 of the ferrule 4 and abutting against the welding partner 18 reliably prevents the molten metal from dripping. Since the contact area between the ferrule 4 and the support plate 3 is large and the heat conduction from the ferrule 4 to the support plate 3 is large, the cooling rate of the weld metal in the ferrule 4 is increased, and high-quality stud welding can be efficiently performed. Run stably .

[0012]

In the illustrated embodiment, a screw rod 22 is connected to an output shaft 21 of a servomotor 20 with an encoder of the welding machine main body 1 by a coupler 23, and a nut body 24 screwed to the screw rod 22 is a clamp 25. It is stuck to. The arm 2 protrudes from the front side of the welding machine body 1 so that the longitudinal direction is parallel to the axis of the clamp 25, and the welding machine body 1 is fixed to the steel plate 18 at a vertical portion 26 at the tip of the arm 2. A magnet unit 27 is provided. The stud reinforcing bar 17 clamped and held by the clamp 25 moves forward and backward with respect to the steel plate 18 by the movement of the clamp 25 along the rail 28 by the operation of the servomotor 20.

The support plate 3 is made of brass and is connected to the vertical portion 26 of the arm 2 by bolting or welding. The vertical portion 26 of the arm 2 and the main body of the arm 2 can also be used as heat dissipating means for the weld metal. In this case, the contact area between the support plate 3 and the arm vertical portion 26 is as large as possible. The support plate 3 and the arm 2 can be formed as one body.

The holding plate 9 abuts on a shoulder 12 between the body 5 and the base 10 of the ferrule 4 at the edge of the receiving groove 11. The pressing plate 9 is urged forward toward the support plate 3 by a compression coil spring type spring 13 inserted between the enlarged head 16 of the guide pin 14 and the back surface of the pressing plate 9.

[0015]

As described above, the ferrule support of the present invention is provided.
In the device, the pressing means of the ferrule 4 is a support play.
The rear shoulder 12 of the ferrule 4
Plate 9 in contact with, and axial direction of ferrule 4
Are fixed in parallel to the back of the support plate 3
Several guide pins 14 and enlarged head 1 of guide pins 14
Spring inserted between 6 and the back of holding plate 9
13 and the ferrule 4
Pressing against the steel plate 18 regardless of the height
The molten metal during welding flows from the ferrule 4
It is possible to reliably prevent the molten metal from dripping
Things. Further, as described above, the ferrule 4 is connected to the steel plate 18.
The ferrule 4
The contact area of the support plate 3 becomes uniform,
3 can be used effectively,
The cooling rate of the molten metal in
You. Since the support plate 3 also serves as a mounting base for the holding plate 9, the structure of the entire apparatus is simplified. In addition, since the holding plate 9 is moved in parallel with the support plate 3 by the plurality of guide pins 14, the ferrule 4 smoothly moves forward and backward without the axial line being shaken.

[Brief description of the drawings]

FIG. 1 is a schematic right side view of a stud welding machine incorporating a ferrule support device according to one embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of the ferrule support device.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a right side view of a stud weld when a ferrule is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding machine main body 2 Arm 3 Support plate 4 Ferrule 5 Main part of ferrule 6 Receiving groove of supporting plate 7 Bottom part of receiving groove 8 Outer peripheral surface of main part of ferrule 9 Holding plate 10 Base end part of ferrule 11 Holding of holding plate Groove 12 Shoulder surface of ferrule 13 Spring 14 Guide pin 15 Hole in holding plate 16 Enlarged head of guide pin 17 Stud reinforcing bar 18 Steel plate 19 Welding bead 20 Servo motor with encoder 21 Output shaft 22 Screw rod 23 Coupler 24 Nut body 25 Clamp 26 Vertical part of arm 27 Magnet unit 28 Rail

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-56545 (JP, A) JP-A-48-92250 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 9/20

Claims (1)

(57) [Claims] 1. A support plate 3 having a large thickness and good thermal conductivity is connected to a tip end of an arm 2 projecting forward from a welding machine main body 1, and the support plate 3 is connected to an axis of a ferrule 4 in a plate thickness direction. Arrange so that it matches the direction, and ferrule 4
The support plate 3 is provided with a receiving groove 6 into which the entire length of the main body portion 5 is fitted, and the bottom surface portion 7 of the receiving groove 6 is formed following the outer peripheral surface 8 of the main body portion 5 so that the main body portion 5 of the ferrule 4 is in close contact. , A ferrule support in a stud welding machine for urging the ferrule 4 toward a welding partner by pressing means.
In the holding device, press the pressing means of the ferrule 4
It is composed of rate 9 and spring 13
Place the holding plate 9 on the back side of the
Plate for holding the receiving groove 11 in which the base end portion 10 is fitted
9 and a guide pin parallel to the axial direction of the ferrule 4
14 are arranged around the receiving groove 6, and the guide pins 14
Is inserted into the through hole 15 of the holding plate 9 so that the support plate 3
Of the ferrule 4 and the base end of the ferrule 4
The holding plate 9 contacting the shoulder 12 between the steps 10
Enlarged head 16 of guide pin 14 and back of holding plate 9
Forward biased by the spring 13 inserted between
Ferrule for stud welding machine characterized by the following:
Support device.