JP4979267B2 - Metal fastener and method for manufacturing washer used therefor - Google Patents

Description

The present invention relates to a manufacturing method of the washer to use metal workpiece metal fasteners over and to be used to conclude to the substrate.

  There are many types of metal fasteners that fasten the workpiece to the base material, such as a drive-in type and a screw-in type, and the workpiece is held and fixed by a head that is integrated with the shaft like a bolt. There are cases where a washer is fitted on the shaft and the workpiece is pressed and fixed by this washer. Rust prevention of metal fasteners has been an issue for a long time, and as rust prevention means, surface treatment such as plating and baking coating is applied, or stainless steel is used as a material.

By the way, there is electrolytic corrosion caused by contact between different metals as a kind of corrosion, and even when a workpiece is fastened with a metal fastener, electrolytic corrosion due to the fact that the fastener and the workpiece are different metals occurs. Sometimes. As a means for preventing electrolytic corrosion, the applicant of the present application disclosed in an earlier application (Patent Document 1) that a metal plate having a higher ionization tendency than the washer and the workpiece is superimposed on the washer.
Japanese Patent Application No. 2005-7963

  The technique disclosed in the prior application prevents or delays the corrosion of the washer and the workpiece by sacrificing the metal plate overlapped with the washer, and can exhibit a high corrosion protection effect. The present invention is a further development of the concept of corrosion prevention by sacrificial corrosion prevention, and its main object is to provide a fastener excellent in stability of the rust prevention function.

The present invention, that contains the manufacturing method of the fastener and washer.

The invention according to claim 1 relates to a fastener, and the fastener includes a fastener main body having a shaft and a head, and a washer fitted to the shaft of the fastener main body, and the fastener can be driven into a workpiece. On the other hand, the washer has a tapered shape, and the washer is composed of a hook-like portion fitted to the shaft of the fastener and a flange provided on the outer periphery thereof, and the hook-like portion of the washer is toward the tip of the shaft. In the configuration in which the workpiece is pressed by the flange of the washer while the shaft is driven into the workpiece, the washer and the metal foil having a higher ionization tendency than the workpiece are disposed on the washer. Are pasted so as to spread over the entire inner surface of the bowl-shaped portion and the seating surface of the flange.

Invention of Claim 2 concerns the manufacturing method of the washer used for the fastener described in Claim 1 , and this manufacturing method is the material board of the area which can take many said washers, and the substantially whole of the single side | surface of the said material board. A material metal foil that can be affixed to the substrate, and after the material metal foil is affixed to one side of the material plate, the hook-shaped portion is processed so that the surface provided with the material metal foil is recessed. It is characterized by punching the shape of the washer .

According to the present invention, the sacrificial anticorrosive action of the metal foil can prevent or significantly delay the corrosion of the washer and the workpiece. That is, the corrosion resistance of electrolytic corrosion can be significantly improved. When corrosion resistance is achieved by plating, the thickness of the plating layer may vary and the corrosion resistance may also vary. However, in the present invention, since the thickness of the metal foil is constant, the corrosion resistance is constant. Therefore, the quality can be stabilized. In addition, it is possible to use a material that is not plated as a material for the washer , which can reduce the environmental load.

As a method of affixing a gold Shokuhaku the washer, when a non-conductive adhesive that is generally used, but it is also possible to stick by applying the scattered point-like manner, using a conductive adhesive, metal foil since whole can paste the washers of an advantage that with a paste strength can be ensured, it can be made uniform anticorrosive performance can be electrically connected to the washer to the metal foil over its entire surface.

The washer is manufactured by pressing the material plate (sheet metal processing). As a method of attaching the metal foil to the washer, it is possible to apply the metal foil after the washer is manufactured. After punching into a predetermined shape, for example, a pickup device such as a vacuum suction device, a dedicated jig for receiving a washer, and the like are required. Therefore, there is a concern that sticking takes time and cost. On the other hand, when the method of claim 2 is adopted, the attachment of the material foil to the material plate can be performed very easily , and thus there is an advantage that a washer with a metal foil and having a hook-shaped portion can be manufactured easily and at low cost. .

Next, an embodiment of the present invention will be described with reference to the drawings .

(1). Structure of First Embodiment The first embodiment is applied to a drive-in fastener, and its form and structure are shown in FIG. 1A is a front view, and FIG. 1B is a partially broken front view. As shown in these figures, the fastener includes a fastener body (pin, collar) 1 having a shaft 2 and a head 3; It consists of a washer 4 fitted on the shaft 2 of the fastener body 1.

The shaft 2 of the fastener main body 1 is tapered as a whole, but about half of the tip side is substantially bullet-shaped with a loosely curved profile when viewed from the front. The approximately half portion positioned is more tapered than the cannonball-shaped portion. The head 3 has a plate shape that is substantially flat. On the other hand, the washer 4 is a form in which a flange 4b is integrally provided on the outer periphery of a trapezoidal bowl-shaped part 4a. The bowl-shaped part 4a opens toward the tip of the shaft 2, and the central part has a shaft 2 Of these, a hole 5 into which a portion slightly on the tip side from the intermediate portion is fitted is formed. And metal foil 6 is affixed on the surface (namely, the seat surface 4c which hold | suppresses the workpiece | work W) on the opposite side to the head 3 of the fastener main body 1 among the washers 4. FIG.

Figure 1 (C) is a plan view of the washer 4, as shown in this figure, the inner peripheral edge of the washer 4, a plurality projections 7 protruding inward at equal intervals along the circumferential direction (4 Formed). The washer 4 is securely held on the shaft 2 by the elastic deformation of the projection 7. The number of protrusions 7 can be set arbitrarily.

  FIG. 1D is a partially enlarged cross-sectional view of the end of the washer 4. As shown in this drawing, the metal foil 6 is entirely formed of a conductive adhesive layer 8 so that the entire surface 4 c of the washer 4. Is pasted. The thickness of the metal foil 6 is not limited, and for example, a thickness of about 10 μm to 30 μm can be used.

  The shaft 2 is made of a hard steel material such as carbon steel, vanadium steel, or stainless steel. After the wire material is processed as a raw material, it is quenched and further subjected to a surface treatment as necessary. On the other hand, the washer 4 is made of carbon steel of S50C to S55C, surface-treated steel plate such as SGCH or SGCC, or cold rolled steel plate such as SPCC, and galvanized by electroplating or hot dipping. (The plating layer may be omitted.) The metal foil 6 is made of a metal material having a higher ionization tendency than the washer 4 and the shaft 2, and for example, a zinc foil is suitable.

(2). In the manufacturing process diagram 2 shows a schematic of the manufacturing process of the washer 4 described above. In this step, as shown in (A), first, a material plate 9 that is a material of the washer 4 and a material metal foil 10 that is a material of the metal foil 6 are prepared. The material plate 9 and the material metal foil 10 are generally band-shaped.

  Then, as shown in (B), the material metal foil 10 is attached to one side of the material plate 9, and then, according to a normal processing method, using a press device (not shown) as shown in (C) The washer 4 is manufactured by punching the outer shape as shown in (D). A release paper (release paper) is generally attached to the adhesive layer of the material metal foil 10, and the release paper is peeled off before being attached to the material plate 9.

  Either the hook-shaped portion 4a or the punching of the hole 5 may be preceded or may be performed simultaneously. When there is a possibility that the metal foil 6 may be damaged due to the processing of the frame-shaped portion 4a, the material metal foil 10 may be pasted after the hook-shaped portion 4a is processed (in this case, the material metal foil 10 has the holes 5). It is vacant and can be attached to the inner surface of the flange 4a by pressing it with a jig made of rubber or the like.)

  In this way, since the material metal foil 10 is pasted on the material plate 9 before punching the washer from the material plate 9, it is processed in comparison with the manufacturing method in which the ring-shaped metal foil 6 is pasted after the washer 4 is processed ( Work) can be greatly reduced.

(3) Usage state Fig. 3 shows the usage state of the fastener. (A) is a figure which shows the whole, (B) is a partial expanded sectional view.

In this example, for example, a steel plate workpiece W is fastened to a thick steel base B. As a specific example, a steel plate deck plate constituting a floor of a building is fastened to a beam material (structure material) made of H-shaped steel (of course, it can be used for other purposes) . Axis 2 full Asuna body 1 is only not enter the substrate B to its intermediate portion, the washer 4 is pressed by the intermediate portion tapering of the shaft 2. Note that the fastener body 1 exhibits a high function of preventing the fastener body 1 from sticking to the base material B.

  The fastener is driven by using a power-type driving tool such as a driving tool that uses gas combustion pressure, an air-type driving tool, or a driving tool that uses explosives.

  By the way, electrolytic corrosion caused by the contact of different metals with each other is due to the unstable state in which one member easily reacts with other atoms due to the movement of electrons from one metal to the other. In addition, when electrons are emitted from one member, the reaction between the one member and water or oxygen existing around the one member is promoted, and corrosion progresses. This electrolytic corrosion may occur between similar metals due to environmental differences such as temperature. If the washer 4 and the workpiece W are in direct contact with each other, electrolytic corrosion may occur.

  In contrast, in the present invention, since the metal foil 6 is interposed between the washer 4 and the workpiece W, electrolytic corrosion can be prevented or significantly suppressed.

  That is, since zinc constituting the metal foil 6 has a higher ionization tendency (higher activity) than iron, which is the main component constituting the washer 4 and the workpiece W, electrons are transferred from the metal foil 6 to both the washer 4 and the workpiece W. Then, the iron atoms constituting the washer 4 and the workpiece W are held in a stable state that hardly reacts with water and oxygen, and as a result, corrosion of the washer 4 and the workpiece W is prevented or It is significantly suppressed. In other words, electrolytic corrosion is prevented or significantly suppressed by the sacrificial anticorrosive action in which the metal foil 6 becomes a sacrificial anode. In this case, since the adhesive layer 8 is conductive, the movement of electrons from the metal foil 6 to the washer 4 is not hindered, and therefore corrosion of the washer 4 can be prevented.

(5). Others present invention can be in addition to various concrete than the above embodiment.

It is a diagram illustrating a fastener of the implementation forms. It is a figure which shows the manufacturing process of a washer. It is a figure which shows the use condition of a fastener.

W Steel plate work B Steel base material 1 Fastener body 2 Fastener shaft 3 Fastener head 4 Washer
4a bowl
4b Flange
4c Seat
6 Metal foil 8 Conductive adhesive layer 9 Material plate 10 Material metal foil

Claims (2)

The fastener body is composed of a fastener body having a shaft and a head, and a washer fitted and fitted to the shaft of the fastener body. The fastener has a tapered shape that can be driven into a workpiece, while the washer is a shaft of the fastener. And a flange provided on the outer periphery of the flange, and the flange of the washer opens toward the tip of the shaft, and the shaft is driven into the workpiece, The work is held by the flange of the washer,
A metal foil having a higher ionization tendency than the washer and the workpiece is attached to the washer surface of the washer so as to spread over the entire inner surface of the bowl-shaped portion and the flange seat surface in the washer.
Metal fastener. It is a manufacturing method of the washer with metal foil used for the metal fastener according to claim 1,
Prepare a material plate of an area that can take a large number of the washers, and a material metal foil that can be attached to substantially the entire one side of the material plate, and after pasting the material metal foil on one side of the material plate, Punching the shape of the washer after processing the hook-shaped portion so that the surface provided with the material metal foil is recessed ,
Washer manufacturing method.

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