JPS6228088A - Linking method for rigid member - Google Patents

Abstract

PURPOSE:To increase a linking strength by solidifying a molten metal after melting with electrification in the state of the end face fixed to a rigid member with its penetration being about flat and the projection of the metallic fastener providing a projection on its center being abutted to a base metal. CONSTITUTION:The front 11a of a board 11 is set to the upper face 4a of a punch 4 and the shank part 23 of a pin 20 is driven toward the punch 4. In this case, the tip part 23a of the pin 20 is bent and expanded by the groove 5a of the upper face 4a of the punch 4 by penetrating the board. Then, the board 11 is overturned, the projection 22 formed on the head pat of the pin 20 is abutted to an H steel 12, a current is passed through a welding gun 9, a spark is generated between the projection 22 of the pin 20 and H steel 12 and the both are joined with melting. The linking part having excellent strength can thus be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method for connecting a rigid member to a metal substrate.

(Prior Art) Walls of prefabricated houses and the like are constructed by connecting panels (hard members) to crosspieces (metallic base materials). Also,
The floor is constructed by connecting boards (hard members) to H steel (metal base material) as beam members.

Conventionally, as a method for connecting the above-mentioned hard member to a metal base material, for example, a screw nail or a tapping screw may be used. The following will explain the wall manufacturing process as an example.

When using screw nails, as shown in Figure 9,
The panel 15 and the crosspiece 16 were connected by abutting the panel 15 on the hollow crosspiece 16 and driving a screw nail 30 into the crosspiece 16 from the surface of the panel 15 with a hammer.

When using a tapping screw, as shown in FIG.
The panel 15 and the crosspiece 16 were connected by screwing a screw into the hole 16a from the surface of the panel 15.

Further, a technique considered to be relatively close to this invention is described in Japanese Patent Application Laid-Open No. 49-43056. To explain in detail, first, a heat insulating material is layered on a metal base material. Then, the head of the rivet is magnetically attracted to the welding gun, and when the worker holds the welding gun and pierces the rivet into an insulating material such as asbestos, when the tip of the rivet makes point contact with the metal base material, A current is passed through the opening to weld the two together. Note that a presser plate is provided on the head of the rivet to prevent the head of the rivet from being buried in the flexible heat insulating material.

(Problems to be Solved by the Invention) However, in the method using the screw nail 30, cracks tend to occur in the hard member when the screw nail 30 is driven in. Further, there was a problem in that the screw nail 30 could not be driven into a part of the corner of the metal base material, and the places where the screw nail could be driven were limited.

Further, in the method using the tapping hole 40, the holes 16a had to be formed in the metal base material in advance, which required a lot of effort. Moreover, the tapping screw 40
It was difficult to align the hole 16a with the hole 16a and screw it in.

Further, in this case as well, the tuffing screw 40 could not be screwed into a part of the corner, and the screwing places were limited.

Further, when using the screw nails 30 and the tapping screws 40, connection is difficult if the metal base material is too thin or too thick, and there are restrictions on the thickness of the metal base material.

The technique disclosed in Japanese Patent Application Laid-Open No. 49-43056 involves manually inserting rivets by holding a welding gun in the hand, and is applicable only when the heat insulating material is flexible. It is not applicable when connecting to a manufactured base material. In addition, since the tips of the rivets are tapered and sharp, there is a drawback that the welding area is small and the connection strength is low.

(Means for Solving the Problems) This invention has been made to solve the above problems, and its gist is to provide a metal fastener with a substantially flat end surface and a protrusion in the center thereof. A connection of hard members characterized in that the metal stopper is fixed through the hard member, and electricity is passed between the two with the protrusion of the metal stopper in contact with the metal base material, and the molten metal generated by this current is solidified. It's in the method.

(Function) A metal stopper with a substantially flat end surface and a protrusion provided approximately in the center is fixed by passing through a hard member.

Then, with the protrusion of the metal stopper in contact with the metal base material, electricity is passed between the two, and the current generates molten metal. Solidification of this molten metal connects the hard member to the metal base material.

(Example) First, an example of a bottle (metal fastener) used in carrying out the method of this invention will be described with reference to FIG. This bottle 20 is composed of a head portion 21 and a shank portion 23. The head portion 21 is formed into a disk shape and has a larger diameter than the shank portion 23, and has a flat top surface 2.
A protrusion 22 protruding from the center of 1a serves as an electrical path. Further, the shank portion 23 is formed in a cylindrical shape from the tip portion 23a to the middle portion, and has a hollow portion 24 therein.

Reference numeral 1 in FIGS. 2 and 3 is a press machine, which caulks and fixes the pin 20 to the board 11 (hard member). This press machine 1 has a cylindrical hammer 2 (pressing member)
A locking hole 3 having substantially the same shape as the head portion 21 of the pin 20 is formed in the lower part i2a of the hammer 2. Further, an annular groove 5 is formed on the upper surface 4a of the punch 4 for caulking the tip 23a of the shank portion 23 of the bottle 20. The inner surface 5a of this groove 5 constitutes a deformation guide surface.

Reference numeral 6 in Fig. 5 is a welding machine, and H steel 12 is used as a beam material.
The pin 20 is welded to a metal base material.

The welding machine 6 includes a capacitor 7 (welding machine main body), a pair of electric wires 8 a and 8 b extending from the capacitor 7, and a welding gun 9 (only the tip is shown in the figure and the overall shape is omitted).
It is composed of.

An annular groove 9a is formed in the distal end surface of the welding gun 9. Further, one electrode of the capacitor 7 is connected to the welding pin 9 via an electric wire 8a.

Further, a contact holder 10 is provided at the tip of the other electric wire 8b.

Next, the manufacturing process of floors for prefabricated houses, etc. according to the method of this invention will be explained using non-conductive and non-flammable (or flame-retardant) floors such as F boards according to FIGS. 2 to 5 and FIG. 1. It is.

As shown in FIG. 2, a board 11 is placed on the upper surface 4a of the punch 4.
The surfaces 11a of the two are aligned. From this state, when the head part 21 of the pin 20 is housed in the locking hole 3 of the hammer 2 of the press machine 1 and the hammer 2 is lowered at high speed, the shank part 23 of the pin 20 will become as shown in FIG. Back side 1 of board 11
It is driven from 1b towards punch 4. In this case, the shank portion 23 of the pin 20 can be driven into the board 11 with a relatively small pressing force because the portion halfway from the tip 23a of the shank portion 23 has a cylindrical shape. Further, the shavings of the board 11 enter the hollow portion 24 of the pin 20 and do not act as a resistance to the driving force. Therefore, no large stress is applied to the board 11 when punching out the pins 20, and cracks can be prevented.

The tip 23a of the shank portion 23 of the pin 20 is
passes through the board 11, is guided by the inner surface 5a of the annular groove 5 formed on the upper surface 4a of the punch 4, and is expanded while being bent. When hammer 2 descends at 4,
The lower surface 2a of the hammer 2 hits the back surface 11b of the board 11 and pushes the board 11 downward. As a result, the punch 4 is press-fitted into the surface 11a of the board 11, and the tip 23a is further deformed and swaged so as to sink into the surface 11a of the board 11 (the swaged portion is indicated by reference numeral 25 in FIG. 4). The pin 20 is fixed to the board 11 by the caulking described above. In this fixed state, pin 20
The caulked portion 25 of the shank portion 23 is embedded in the board 11 and does not come out from the surface 11a of the board 11.

Next, as shown in FIG. 5, the board 11 is turned over, and the protrusion 22 formed on the head portion 21 of the pin 20 is brought into contact with the upper surface 12a of the H#12. Further, one electrode of the capacitor 7 is connected to the welding gun 9 via the electric wire 8a as described above, and the other electrode of the capacitor 7 is connected to the H steel 12 via the electric wire 8b and the contact holder 10. Connecting.

Next, holding the welding gun 9 by hand, press the welding gun 9 toward the H steel 12 with the annular groove 9a formed on the tip surface of the welding gun 9 in contact with the caulked portion 25 of the pin 20, and press the welding gun 9 toward the H steel 12. When the switch is turned on, as shown in FIG. 5, electric wire 8a and welding wire 9. Pin 20. H steel 12.
An electrical circuit is formed through the contact holder 10° and the electrical wire 8b back to the capacitor 7. As a result, the electricity stored in the capacitor 7 flows instantaneously, causing a spark when the protrusion 22 of the pin 20 and H112 open. Note that the spark time is about 4/1000 seconds. This spark causes the top surface 21a of the head portion 21 of the pin 20 and the top surface 1 of the H steel 12 to
Melt 2a. Furthermore, after the spark starts, by continuing to press the pin 20 with the welding gun 9, the pin 20
The molten metal 13 can be filled between the top surface 21a of the head portion 21 and the top surface 12a of the H steel 12 without creating a gap. By solidifying the molten metal 13, the head portion 21 of the pin 20 is welded to the H steel 12, as shown in FIG. When the spark is generated, the curved convex surface of the caulked portion 25 that is expanded and formed and the curved concave surface of the groove 9a of the welding hole 9 are in surface contact over a wide area, so that the electrical resistance between them is reduced. is the protrusion 22 and H141
As a result, spark generation between the protrusion 22 and the H steel 12 can be ensured.

Further, since the molten metal 13 is generated and solidified over the entire top surface 21a of the head portion 21 of the pin 20, a large welding area can be obtained, and the connection can be made strong.

This invention is not limited to the above-mentioned embodiments, and various embodiments are possible. For example, FIGS. 7 and 8 show other embodiments. In this embodiment, a pin 20' having the same outer diameter over the entire length is used, and if the pin 20' is caulked and fixed to the board 11 so that the top surface 21a' and the back surface 11b of the board 11 are flush with each other, , the back surface 11b of the board 11 and the top surface 12 of the H steel 12
a can be connected without any gaps. The structure of the pond is the same as that in the previous embodiment, so the same reference numerals are given in the drawings and the explanation thereof will be omitted.

Moreover, a non-conductive material such as plywood can also be used as the hard member. Furthermore, a hole may be made in advance in the conductive hard member, and a metal stopper may be inserted and fixed into the hole through an insulating layer such as a resin tube.

The metal stopper can also be constituted by a bolt having a protrusion on its head and fixed to a hard member using a nut.

(Effects of the Invention) As explained above, in this invention, since welding is used, hard members can be connected at any location on a metal base material, and even if the metal base material is thin, it can be thick. Can also be connected.

Moreover, by performing the fixing of the metal stopper to the hard member and the welding of the metal stopper to the metal base material in separate processes, the end face on the welding side of the metal stopper can be made flat and wide. This wide welding area increases the connection strength between the hard member and the metal base material. Further, by providing a protrusion approximately in the center of the end face of the metal stopper to form an electrical path, welding can be ensured.

[Brief explanation of the drawing]

The drawings from FIG. 1 to FIG. 6 show an embodiment of the present invention, and FIG. 1 is a sectional view showing the state after the connection of the hard members is completed, and FIGS. 2 to 4 show the hard members. A cross-sectional view explaining the process of caulking and fixing a metal fastener, Figure 5 is a cross-sectional view showing a state in which a metal stopper is welded to a metal base material, and Figure 6 is a cross-sectional view of a metal stopper being welded to a metal base material. Perspective view of the stopper, FIG.
Figure 8 shows an embodiment of the pond, Figure 7 is a sectional view showing the state after the hard members are connected, Figure 8 is a perspective view of the metal stopper, Figures 9 and 10. 2A and 2B are cross-sectional views showing a state in which hard members are attached to a metal base material using different conventional connection methods. 11... Board (hard member), 12... H steel (metallic base material), 13... Molten metal, 20.20'... Bottle (metal fastener), 21a, 21a'. ...Top surface (one end surface of metal stopper), 22...Protrusion.

Claims (1)

[Claims] (1) A metal stopper with a substantially flat end surface and a protrusion approximately in the center is fixed through the hard member, and the protrusion of the metal stopper is placed in contact with the metal base material between the two. A method for connecting hard members, characterized by flowing electricity and solidifying molten metal produced by the current.