JPH106033A - Guide pin of welding electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a valve action of high sealing effect with good fitness of a seat part by tightly fitting the seat part of non-metallic material constituting a part of a guide pin of the welding electrode to a metal-made tapered hole, to improve the electric insulation property of an electrode and to secure the durability for a long time by setting a permeable gap to a fixed value. SOLUTION: The guide pin 6 penetrated into the hole of a plate-like parts 13 is constituted with a metal-made guide part (formed in hollow state) 20 and the non-metallic-made seal part 21 integrated with this guide part 20. Further, the seal part 21 is constituted with a protecting part 22 having larger diameter than that of the guide part 20, a tapered seat part 23 succeeding to the protecting part and further, a base part 24 succeeding to the seat part. Further, the air permeable gaps 25, 26 are arranged on the outer peripheral parts of the protecting part 22 and base part 24 and between the welding electrode and the guide hole, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide pin mounted on an electrode for projection welding or the like.

[0002]

2. Description of the Related Art A guide pin described in Japanese Utility Model Publication No. 54-9849 is the closest prior art to the present invention. This is shown in FIG. 4. To explain this, the guide hole 2 in the electrode 1 is composed of a small-diameter hole 3 and a large-diameter hole 4, and a tapered hole 5 is provided at a connection portion between the two holes 3 and 4. . On the other hand, the guide pin 6 includes a small diameter portion 7 and a large diameter portion 8, and a tapered portion 9 is provided at a connection portion between the two portions 7 and 8. Coil spring 1 in guide hole 2
0 is inserted, the elasticity acts in a direction to push up the guide pin 6, and a vent 11 for introducing compressed air is opened in the electrode 1. As shown, the tapered portion 9 is in close contact with the tapered hole 5 due to the elasticity of the coil spring 10. A gap 12 is provided between the small diameter hole 3 and the small diameter portion 7. The steel plate part 13 is positioned on the electrode 1 by the penetration of the guide pin 6, and the conical part 15 is inserted into the screw hole of the projection nut 14,
It is prepared for advance of a movable electrode (not shown). The electrode 1 is made of a copper alloy, and has a cap 17 integrated with a main body 16 with a screw portion 18, and the outer shape and the guide hole 2 are circular in cross section. Furthermore, although not described in the utility model publications listed here, such types of guide pins are coated with ceramic over the entire surface, thereby imparting insulation and wear resistance. . This is shown in FIG. 5, in which a coating layer 19 is formed by spraying ceramic onto the surface of a guide pin 6 made of metal such as steel.

The operation of the apparatus shown in FIG. 4 will be described. When the movable electrode advances and its end face hits the end of the guide pin 6 and is pushed down, the tapered portion 9 separates from the tapered hole 5 and the compression from the vent 11 is performed. The air blows out from the gap 12 to the outside through the gap in the tapered portion.
When the movable electrode further advances, the projection nut 14 is pressed against the steel plate part 13, and then, when a welding current is applied, the nut 14 is welded to the steel plate part 13. In the transitional period in which the welding is performed, spatters are scattered. However, the spatters are eliminated by the air ejected from the gap 12, and are prevented from entering the gap 12. In addition, it is cooled by the jet air.

[0004]

With the above-described guide pins, the coating layer 19 having a very hard and rough surface is present, so that the small-diameter holes 3 and the tapered holes 5 are not provided.
Is significantly worn by the cap 1 of the guide pin 6 itself.
7 cannot be sufficiently secured in the diametric direction, that is, the centering cannot be sufficiently ensured. In particular, when the inner surface of the small diameter hole 3 is worn, this problem is further increased.
Furthermore, if the conical portion 15 is worn at the corner of the projection nut 14 and the coating layer 19 is lost and the nut comes into direct contact with the metal portion, the original insulating function cannot be achieved.

[0005]

[Means for Solving the Problems and Their Functions] The present invention has been provided to solve the problems described above.
Claim 1 comprises a metal guide penetrating the hole of the plate-shaped component and a non-metallic seal part integrated with the guide part, wherein the seal part has a protection part having a larger diameter than the guide part. It consists of a tapered seating part connected to it and a base part further connected to it, and a ventilation gap is provided between the protection part and the guide hole of the electrode on the outer peripheral part of the base, respectively, Since the seal part is made of a material such as synthetic resin, it is possible to avoid the phenomenon that abnormal wear occurs in each part of the guide hole of the electrode, and in particular, the protective part prevents abnormal wear of the inner surface of the small diameter hole. doing. Claim 2
In the first aspect, the guide portion is hollow, and the projection bolt is received in the hollow portion to perform the same operation as described above.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the illustrated embodiments. First, FIGS. 1 and 2
However, components having the same functions as those described with reference to FIG. 4 are denoted by the same reference numerals in FIGS. 1 and 2 and detailed description thereof is omitted. The guide pin 6
The guide portion 20 includes a metal guide portion 20 and a non-metallic seal portion 21 integrated with the guide portion 20. The seal portion 21 has a protection portion 22 having a larger diameter than the guide portion 20 and a tapered seating portion 23 connected thereto. And a base 24 connected thereto, and the ventilation gaps 25 and 2 between the protection part 22 and the small diameter hole 3 and between the base 24 and the large diameter hole 4 respectively.
6 are installed. Each of the electrodes 1 and the guide pins 6 has a circular cross section.

The guide portion 20 is integrally provided with a shaft portion 27 which penetrates through the seal portion 21 and tightens a nut 28 at an end thereof to integrate the guide portion 20 with the seal portion 21. Have been. The base 24 has a skirt shape as shown in FIG. 2, and the coil spring 10 is fitted into a step portion 29 formed therein. The guide section 20 is made of stainless steel or an alloy mainly composed of the same, and the seal section 21 is most suitably made of synthetic resin, for example, Teflon or nylon mixed with glass fiber. In addition, when the dimensions of each part are illustrated, each diameter of the guide part 20, the protection part 22, and the base part 24 is 6 m, respectively.
m, 8 mm and 20 mm, the ventilation gaps 25 and 26 are 0.5 mm, and the total length of the guide pin 6 is 38 mm.

In the embodiment shown in FIG. 3, the guide portion 20 is hollow, and reference numeral 30 denotes a hollow portion. The components here are projection bolts, and reference numeral 31 indicates a shaft portion, and reference numeral 32 indicates a flange portion integrated with the shaft portion.

Next, the operation will be described. FIG. 1 shows a state in which the seat portion 23 is tightly adhered to the tapered hole 5 by the air pressure from the ventilation port 11 to block the air flow.
Now, when the movable electrode (not shown) advances, the nut 14 is moved.
When the flange portion 32 is pushed down, the seating portion 23 separates from the tapered hole 5, and the compressed air flows out of the hole of the plate-shaped component 13 through the ventilation gap 26, the seating portion 23 separated from the tapered hole 5, and the ventilation gap 25. To prevent the intrusion of spatter and perform a cooling action.

[0009]

According to the present invention, the seat portion made of a nonmetallic material is in close contact with the metal tapered hole, so that a valve action with a high sealing effect can be obtained by the familiarity of the seat portion.
And since the protection part is also made of non-metal and has a larger diameter than the guide part, there is no metal contact between the guide part and the small diameter hole, and therefore, this part can wear the inner surface of the small diameter hole. Absent. In this way, the ventilation gap is always set to a constant value, and the durability of the electrode itself can be significantly prolonged. Even if the metal guide part is slightly worn, the non-metal seal part performs the insulating function, so that the problem of short-circuit of the welding current does not occur. Further, by making the guide portion hollow, a projection bolt or the like can be successfully welded.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a guide pin.

FIG. 3 is a partial longitudinal sectional side view showing another embodiment.

FIG. 4 is a vertical sectional side view showing a conventional technique.

FIG. 5 is a partial cross-sectional view showing a coating layer of a guide pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Plate-shaped component 20 Guide part 21 Seal part 22 Protective part 23 Seating part 24 Base 25, 26 Ventilation space 30 Hollow part

Claims (2)

[Claims] 1. A device comprising a metal guide penetrating a hole of a plate-shaped component and a non-metallic seal part integrated with the guide part, wherein the seal part has a protection part having a larger diameter than the guide part. A welding electrode guide comprising a tapered seating portion connected thereto and a base portion further connected thereto, wherein ventilation holes are provided between the protection portion and the outer peripheral portion of the base portion, respectively, between the guide holes of the electrodes. pin. 2. The guide pin for a welding electrode according to claim 1, wherein the guide portion is hollow.