JPS5893576A - Hollow stud - Google Patents

Abstract

PURPOSE:To mass-produce hollow studs with welding strength at low cost by forming a stud main body of a metallic pipe, and fitting a core body in one end opening part and providing a projection part outside of the core body. CONSTITUTION:A stud main body 1 is formed by cutting a metallic pipe to prescribed size; and a metallic core body 2 is pressed in one end opening part of the stud body 1 and the external end surface of the core body 2 is worked conically to form a projection part 3. An opening part 4 on the opposite side to the welding side where the core body 2 is fitted is drawn to a small diameter over prescribed length, and its internal surface is cut into a female screw 5. In this case, the minor diameter of the female screw 5 is a little bit less than the internal diameter of the hollow hole 1a of the stud body 1, and a threaded shaft engaging with the female screw 5 penetrates the female screw 5 to enter the hollow hole 1a. The welding side where the core body 2 is fitted is welded to a base metal 6 by a ordinary stud welding method to use the hollow stud.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stud for stud welding, in particular to a hollow stud in the form of a pipe.

Stud welding requires a protrusion at the center of the end face on the welding side, so it is generally manufactured by processing a bare material, that is, a metal rod. Therefore, when manufacturing a special stud with a long threaded hole in the stud body as shown in FIG.
The stud main body 21 is bored from the opposite end surface, and a female thread 23 is cut into the inner surface thereof. However, such hollow studs are not easy to manufacture and require a lot of time and effort, and they also have the disadvantage of high material loss and high thrust. In particular, when the female thread 23 has to be made longer or when it is necessary to provide a hollow hole inside the female thread, processing costs and material costs have increased significantly.

The present invention has been made in view of the above-mentioned conventional problems and as a countermeasure thereof.The stud body is formed of a metal tube, and a metal core is press-fitted into the gluing portion at one end of the metal tube.
A hollow stud is provided in which a protrusion is provided on the outer end surface of an i-core body.

In addition, in order to provide and tighten the necessary and sufficient welding strength to the welding part of the queen hollow stud, the welding side opening of the metal tube forming the stud body is arranged to have a welding area of a required welding area. The present invention provides a hollow stud that is drawn or expanded to a corresponding outer diameter. By doing this, it is possible to avoid making the weld part larger than necessary, compensate for the lack of weld part cross-sectional area, and obtain a hollow stud with a reasonable weld cross-sectional area that is sufficient to meet the needs. .

Accordingly, the present invention provides a hollow stud in which a female thread is provided at the opening of the metal tube forming the stud body on the side opposite to the welding agent, and a hollow hole is provided deep inside the stud body.゛The following is one of the invention! l! Examples of koji will be explained based on illustrations. The stud body 1 is formed by cutting a commercially available pipe into a predetermined size.
Press-fit the metal core 2 into the opening at one end, #core 2
The protrusion 3 is formed by processing the outer end surface of the protrusion into a conical shape. On the other hand, the opening 4 on the side opposite to the welding side where the core body 2 is fitted is drawn to a narrow diameter over a predetermined length, and a female thread 6 is cut on the inner surface thereof. The root diameter of the female thread 6 is formed to be slightly smaller than the inner diameter do of the hollow hole 1a of the stud body 1, so that a screw shaft (not shown) that is aligned with the female thread 6 passes through the female thread 6. The hollow stud of the above structure, which can be entered through the hollow hole 11Lt, has a core body 2 as shown in FIG. The welded side is then attached to the base material 6K11 using the normal stud melting method, so in this case the stud body 1 and core body 2 are integrally melted and welded to the base material 6. Therefore, the welded cross-sectional area is substantially the same as that of a stud made of a solid bar material having the same diameter as the outer diameter of the stud body 1 made of pipe material, and is 1! - Aggressive welding strength can be obtained. In the figure, 7 indicates a welded part. □ Note that the protrusion 3 is not only formed by machining the outer end surface of the core body 2' into a conical shape as shown in FIG.

To facilitate and ensure arc generation during welding.

As illustrated in FIG. 8, a small ball 8 made of aluminum may be embedded in the center of the outer end surface of the core body 2, and the small ball 8 may be used as a protrusion. In this case, the outer end surface of the core body 2 is (
It may be formed into a conical shape as shown in (A), or it may be formed into a flat surface as shown in (A).As shown above, the pipe-shaped stud body 1 and the core body are integrally melted and welded. Therefore, when the welding strength to the base metal 6 becomes larger than necessary.

As shown in Figures 4' and 5, the welding opening e of the stud body 1 is drawn so that its outer diameter is approximately the same as the shaft diameter dimension corresponding to the required welding cross-sectional area. Accordingly, the core body 2 that is press-fitted into the opening 9 is also made to have a diameter of lII. By doing so, it is extremely economical to save money on the base material 6. On the other hand, if it is necessary to increase the welding cross-sectional area, the insufficiency of the welding cross-sectional area can be compensated for by expanding the opening m and increasing the diameter of the core body 2 accordingly. FIG. 6 shows an example in which the stud body 1 is used as it is in the pipe shape without providing the female thread 6.

Next, a sixth example of the use of the hollow stud of the present invention having the above configuration will be described.
Figure 6 shows concrete placement when constructing adjacent to the boundary area 10 and pouring foundation concrete 12 along the nine earth retainers 11 during foundation work at a construction site. An example in which the hollow stud of the present invention is used for connecting the separator 14 used to assemble the frame 13 is shown. Normally, the earth retaining 11 is constructed by driving eye beams 16 into the boundary area 10 at appropriate intervals, and inserting the horizontal sheet piles 16 between the adjacent eye beams 16.
It is constructed by putting earth and sand in between. and.

Separator 1 on the side wall E1151L of each eye beam 16
4 is connected to the formwork 13 at the other end of the separator 14.
C to hold it fixed. However, the nine eye beams 16 that are driven in at the ninth point to construct the earth retaining 11 are not necessarily driven exactly perpendicular to the ground as shown in the figure, but are often tilted, and as a result, the side wall surface 15
The distance between 1L and the formwork 13 varies depending on the location and is not constant. Therefore, it is necessary to adjust the length of each separator 14 each time the mounting position changes.
Conventionally, installing such a separator 14 has been very time-consuming and laborious.

In the above case, if the hollow stud of the present invention is used to connect the separator 14 to the eye beam 16, the separator 14 can be attached very easily and quickly. Namely.

When the hollow stud illustrated in FIG. 1 is welded to the side wall 15a of the eye beam 16 and the threaded portion 141L of the separator 14 is screwed into the female thread 6 provided in the opening 4 on the opposite side, the threaded portion 141L becomes the female thread 6. Hollow hole T
Since it is possible to enter with ilt, it is possible to enter by adjusting the screwing depth of the threaded portion 14a.

From the side wall surface 151L of the eye beam 16 to the separator 14
The length up to the end of the separator 14 can be adjusted by a small amount, so the attachment of the separator 14 can be carried out extremely easily and quickly.

Note that the hollow stud of the present invention is not limited to the usage example shown in FIG. 6, and can of course be used for various purposes and applications.

As detailed above, 1. Since the stud body of the hollow stud of the present invention is formed from a metal tube, 1. For example, a hollow stud with a female thread at the end opening and a hollow hole deep inside can be manufactured at low cost. Can be mass produced. Moreover, the metal core is press-fitted into the opening on the welding side, and the protrusion is provided on the outer end surface of the core.

The welding strength is equivalent to that of regular studs made of solid bars.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an example of a hollow stud according to the present invention, FIG. 2 is a partially cutaway front view showing the same in use, and FIG.
The figure is a longitudinal sectional front view showing a modification of the welded part, #! 4 and 5 are longitudinal sectional front views showing different embodiments, 6- is a cross-sectional plan view showing the same usage example, and FIG. 7 is a longitudinal sectional front view showing a conventional example. 1...Hollow stud body 1a...Hollow hole 2...Core body 3...Protrusion 4...Opening 6...・Female thread 6・・
...Base material 7...Welded part patent applicant Matsuyama Kikuuma-ku -ε ′s. Canter Ma

Claims (1)

[Claims] 1. The stud body is formed of a metal tube, a metal core is press-fitted into an opening at one end of the metal tube, and a protrusion is provided on the outer end surface of the core. hollow stud. i The welding side opening of the metal tube forming the stud body is
The hollow stud according to claim 11!1, which is drawn or expanded to an outer diameter dimension corresponding to a required welding area. 6. The hollow stud according to claim 1 or 42, wherein a female thread is provided on the inner surface of the opening on the side opposite to the welding side of the metal tube forming the stud body. The hollow stud according to any one of claims W41 to 8, wherein the protrusion is a small sphere made of aluminum varnish embedded in the center of the end face of the core.