JP2017127902A - Stud pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an after-driving stud pin that prevents poor welding, such a perforation, in a thin base material and can be used safely.SOLUTION: In the stud pin, a discoidal washer is fixed at a rear end of a shaft pin, a sharp-pointed tip part is formed at a tip of the shaft pin and, in the direct vicinity thereof, a flange with a spherical body part is formed so as to be larger than a shaft pin diameter, where each of them is constituted of a conductive material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stud pin used when fixing a covering material after covering the base material surface of a building steel frame or mechanical equipment with a covering material such as a heat insulating material or a soundproof material made of glass wool, rock wool or the like. It is about.

Conventionally, a stud pin is previously welded in advance to a base metal surface of a building steel frame or mechanical equipment, and a covering material such as a heat insulating material or a soundproof material is wound around the stud pin. There is a so-called pre-stud stud pin for the procedure of fixing the screw.
On the other hand, the covering material such as a heat insulating material is wound around the base material surface of the building steel frame or mechanical equipment first, and then the stud pin is inserted from above and welded to the base material surface to fix the covering material. There is a so-called post-placed stud pin for the procedure to be performed.
The present invention relates to the latter stud pin for post-striking, and various devices such as various shapes have been proposed so far for this post-spinning stud pin.

Japanese Patent Laid-Open No. 4-123880 JP-A-8-28530 By the way, the feature of Patent Document 1 is a spot welding rod having a flat shape with a tip sharpened into a chevron shape and the chevron-shaped tip tilted with respect to a direction perpendicular to the axis. Proposed. In addition, as a feature of Patent Document 2, a washer-attached fusion pin in which a disc-shaped collar piece is provided at the tip of the leg and a small protrusion for welding is formed at the center of the tip. However, these proposals have problems such as a possibility that a hole is formed in the base material when the base material is thin.

  By the way, in recent years, especially in the case of a ventilation duct disposed on the ceiling or the like, a lightweight ventilation duct made of a thin base material is employed as long as the function of the duct is maintained in terms of workability and cost. There is a tendency. As a result, a thin base metal cannot withstand the welding heat during stud welding, and a so-called “perforated” problem of poor welding has arisen.

  In particular, in the case of the above-described stud pin for leading, the operator can visually check the quality of the welded state on the spot, and if it is known that the welding is poor, it can be said that the hammer is reworked on the spot. However, in the case of a post-stud stud pin, the welded part is covered with a covering material, so it is impossible to visually check the welded state, and there is a concern that welding defects such as holes may be overlooked. is there. Therefore, there is a demand for a stud pin for post-coating that can be used with peace of mind even for a thin base material.

  In order to solve the above problems, the present inventors have adopted the following configuration as a result of intensive research. That is, the stud pin for post-cooking according to the present invention is composed of a conductive material, and a disc-shaped washer is fixed to the rear end of the shaft pin, and the tip of the shaft pin has a sharp tip and its tip. We have developed a stud pin for post-coiling that can sufficiently handle even a thin base metal by forming a heel of a spherical body part larger than the diameter of the shaft pin in the immediate vicinity.

  The major feature is that the tip of the shaft pin has a sharp tip and a ridge of a spherical body portion formed in the immediate vicinity thereof to form a convex curved surface with respect to the base material. More specifically, in the case of a shaft pin of φ1.3 to 1.8 mm, a ridge of a spherical body part made of a convex curved surface of R3.0 to 4.0 is formed immediately adjacent to the tip of the shaft pin. To be. By satisfying this requirement, stud welding is possible for a thin base metal having a thickness of 0.4 mm.

  As used herein, the spherical surface portion of the heel may be formed of a sphere as a whole, and if at least the curved surface of the spherical body portion is formed into a convex curved surface toward the base material, It may be a spherical body part formed of a hemisphere or the like, and is not restricted by a spherical part of a full circle.

  In short, the conventional idea of stud pin welding is to maintain the tip of the stud pin in a sharply tapered shape and keep the contact point with the base metal surface small, and then rapidly apply a high-voltage current to We have been seeking strong welding power with the amount of molten metal that is generated from sparks and melted from an instantaneous high melting temperature. However, for a base material that has been sought to reduce weight by adopting a thin material such as the ventilation duct described above, the damage to the base material surface is too great for a conventional stud pin, and it is called `` perforated '' I saw the limit of poor welding.

Therefore, as a result of studying how to reduce the damage to the base metal surface from the reverse idea, the present inventors cannot control the current with the original thyristor (SCR) discharge method. Therefore, paying attention to the current waveform pattern indicating the amount and speed of the current that flows depending on the material and shape of the pin, we devised to tie the requirements derived from this change in the current waveform to the pin shape.
In the present invention, the current waveform shown at the pin tip is used to investigate the balance between the melt volume and the wide welding area from the uniform melting temperature and melting speed at high temperatures, and this is applied to the base metal in light of the discharge characteristics of the welding current. As a result, the completion of the stud pin for post-coating with the following configuration was reached.
In other words, the post-stud stud pin according to the present invention is made of a conductive material, and a disc-shaped washer is fixed to the rear end of the shaft pin, and the tip of the shaft pin has a sharp tip and its tip. A ridge of a spherical body part larger than the shaft pin diameter is formed in the immediate vicinity.

The stud pin for post-cooking according to the present invention is formed immediately adjacent to the tip portion at the same time when the tip portion of the shaft pin is melted at an equal melting temperature and melting speed under appropriate conditions with respect to the base material surface. As a result of calculating the uniform melting temperature, melting rate and melt volume in the same way for the convex curved part of the spherical body part larger than the shaft pin diameter in light of the discharge characteristics of the welding current, these controls Can be obtained from the pin shape of the product of the present invention.
That is, by setting the conditions that do not cause damage to the base metal surface from the shape of the pin, welding is performed with a wider welding surface with the molten product amount of the tip of the shaft pin and the spherical body portion of the immediately adjacent flange. Thus, even when a thin base material was used, a perforation defect was avoided. In particular, the product of the present invention has a stud pin that can be used with confidence even for post-working without causing poor welding with a hole even for a thin base metal with a thickness of 0.4 mm, which is impossible with a commercially available stud pin. I was able to provide it.

BRIEF DESCRIPTION OF THE DRAWINGS Front conceptual explanatory drawing of the stud pin for backlash which shows one embodiment of this invention. The conceptual explanatory drawing before electricity supply which penetrated the coating | covering material with the stud pin and the front-end | tip part contact | connected the preform | base_material. The conceptual explanatory drawing just after the electricity supply which shows the state which supplied with electricity to the stud pin, the front-end | tip part of this stud pin, and the convex curved part of the collar and were welded to the base material. FIG. 2 is a longitudinal cross-sectional explanatory view showing a partially enlarged shaft pin tip of the stud pin shown in FIG. 1.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a stud pin for post-scoring according to the present invention will be described with reference to FIGS. 1 to 4. In the figure, A represents the post-striking of the present invention formed of a conductive material. It is a stud pin for. B is a ventilation duct (base material) molded by a galvanized iron plate having a thickness of 0.4 mm.
More specifically, reference numeral 1 in the figure denotes a shaft pin made of brass and having a length of 50 mm and a diameter of 1.6 mm. Reference numeral 2 denotes a disk-shaped washer having a diameter of 25 mm fixed to the rear end of the shaft pin 1 by caulking or the like. Reference numeral 3 denotes a sharp conical tip with a height of 0.6 mm formed at the tip of the shaft pin 1, and reference numeral 4 denotes a spherical body part formed immediately adjacent to the tip 3. The spherical body portion of the flange 4 is formed by forming a convex curved surface of R3.2 mm with respect to the base material B.
FIG. 2 is a conceptual explanatory diagram before energization in a state in which the stud pin A penetrates the covering material C and the tip portion thereof is in contact with the base material B. Next, FIG. 3 is a conceptual explanatory view after the energization and welding in the state where the stud pin A penetrates the covering material C and the tip thereof is in contact with the base material B. As is apparent from this figure, the stud pin A and the base material B according to the present invention are welded with a wide welding area 4 '●, and the welding area 1' ○ with the base material B in the case of a conventional straight stud pin is welded. You can understand the difference.

  As shown in the partially enlarged view of FIG. 4, in the stud pin A, the convex curved surface line 40 in which the cross-sectional shape R value curve of the convex curved surface of the flange 4 is a broken line 40 with respect to the φ1.6 mm axial pin 1. This is different from the simple inclined line 40 'that may occur during the molding process of the conventional stud pin, as shown by the broken line 40'.

  In the welding procedure of the stud pin A according to the present invention, the stud pin A is inserted into an appropriate portion of the covering material C that is externally attached to the outer wall of the base material B, and the tip portion 3 of the shaft pin 1 is brought into contact with the base material B. . Next, normal welding is performed by operating the welding machine main body and flowing a welding current from the washer 2 through the welding gun.

As an embodiment for carrying out the above, an example of using the stud pin A in the case where the covering material C is externally attached in the ventilation duct using the base material B having a thickness of 0.4 mm and the covering material C is fixed to the ventilation duct. Although shown, the stud pin A of the present invention is not limited to the use of a ventilation duct, and can be used in the field of ordinary stud welding. Moreover, although the characteristic with respect to the base material B of 0.4 mm thickness was shown, it cannot be overemphasized that the more stable welding is possible also to the base material thicker than this. Then, it goes without saying that it is possible to use the stud pin A as a leading stud pin by erasing the washer of the stud pin A.
Furthermore, by applying restrictions and conditions to the strength and weight of the stud pin A, the base material B, and the covering material C, stud pins with various configurations can be obtained from calculations in light of the discharge characteristics of the welding current flowing through the material. Can be provided.

A ... Stud pin B of the present invention ... Base material C ... Covering material 1 ... Shaft pin 1 '... Shaft pin welding area 2 ... Washer 3 ... Tip 4 ... -Spherical body part 4 '... Spherical body part welding area 40 ... Convex curved surface line 40' ... Simple inclined line

Claims (3)

  A disc-shaped washer is fixed to the rear end of the shaft pin, each of which is made of a conductive material, and a sharp tip at the tip of the shaft pin and a spherical body part larger than the shaft pin diameter in the immediate vicinity. A stud pin for post-striking, characterized in that is formed.   The stud pin according to claim 1, wherein the flange of the spherical body part is formed with a spherical body part having a convex curve with respect to a base material to be welded.   A shaft pin with a diameter of φ1.3 to 1.8 mm, with a sharp tip at the tip of the shaft pin and a ridge of a spherical body part having a convex curved surface of R3.0 to 4.0 at the immediate side. The stud pin according to claim 1, wherein the stud pin is formed.

Images