JP2007302971A - Metallic fastener, washer and method for producing washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily producible fastener having excellent corrosion prevention performance. <P>SOLUTION: The fastener is composed of: a fastener body 1 having a stem 2 and a head 3; and a washer 4 inserted in stem 2 of body 1 of fastening. The face superimposed with the work W in the washer 4 is pasted with metal foil 6 by an electrically conductive adhesive 8. The metal foil 6 is made of a metal stock having an ionization tendency higher than that of the washer 4 and the work W. By sacrificial corrosion prevention in which the metal foil 6 works as a sacrificial anode, the electrolytic corrosion of the washer 4 and the work W can be prevented or remarkably suppressed. In the production process, before the washer 4 is subjected to drawing from the stock sheet, the stock sheet is pasted with the stock foil. Thus, time and effort for the production can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal fastener used for fastening a metal workpiece to a substrate, a washer, and a method for manufacturing the washer.

  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 includes a fastener, a washer, and a washer manufacturing method. The invention of claim 1 relates to a fastener, wherein a metal foil having a higher ionization tendency than the seating surface and the workpiece is attached to a seating surface (in other words, a surface facing the surface of the workpiece) that holds the workpiece. It is a feature.

  According to a second aspect of the present invention, the fastener comprises a main body having a shaft and a washer fitted and attached to the shaft of the main body. The foil is affixed with a conductive adhesive.

  The invention of claim 3 relates to a washer that constitutes a fastener, and is a washer that is pressed against the surface of a work, and a metal that has a higher ionization tendency than the seat and the work on the seat that holds the work. The foil is pasted.

  The invention of claim 4 relates to the washer manufacturing method according to claim 2 or claim 3, and this manufacturing method is performed by attaching a material plate having an area where a large number of washers can be taken, and substantially one surface of the material plate. The material metal foil that can be attached is prepared, and the material metal foil is affixed to the material plate before punching the washer from the material plate.

  According to the present invention, the sacrificial anticorrosive action of the metal foil can prevent or significantly delay the corrosion of the fastener and 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 fastener, thereby reducing the environmental load.

  When the work is held and fixed by the head provided on the fastener body without the washer, a metal foil may be attached to the seat surface of the head. Moreover, when a fastener is a nut, it is good to stick metal foil on the seat surface which hold | suppresses a workpiece | work.

  On the other hand, when the fastener is provided with a washer and the workpiece is pressed and fixed via the washer, a metal foil may be attached to the washer as in claim 2. As a method of sticking the metal foil to the washer, it is possible to apply and paste a non-conductive adhesive that is generally used in the form of dots, but when using a conductive adhesive as in claim 2, Since the whole metal foil can be affixed to a washer or the like, there is an advantage that the affixing strength can be ensured and the metal foil can be conducted to the washer over the entire surface, so that the anticorrosion performance can be made uniform.

  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, if the method of Claim 4 is employ | adopted, since attachment of the raw material foil to a raw material board can be performed very easily, there exists an advantage which can manufacture a washer with metal foil easily and at low cost.

  There are two types of washer, one is flat and the other is uneven. However, in the case of a washer having unevenness, if a method of attaching a metal foil after processing is adopted, the posture alignment of the washer is troublesome. Therefore, the method of claim 4 is particularly beneficial when the washer is not flat, for example when it is bowl-shaped.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show the first embodiment, and FIG. 4 shows the second to third embodiments. First, the first embodiment will be described.

(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 located 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 portion 4a, and a hole 5 is formed in the center portion in which a portion of the shaft 2 that is slightly distal than the middle portion is fitted. ing. 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.

  FIG. 1C is a plan view of the washer 4. As shown in this figure, a plurality of projections 7 projecting inwardly on the inner peripheral edge of the washer 4 (four pieces) at equal intervals along the circumferential direction. ) Is formed. This washer 7 is elastically deformed, so that the washer 4 is securely held on the shaft 2. 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. There is no limitation in the thickness of the metal foil 6, For example, the thing of about 10 micrometers-30 micrometers 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). Manufacturing Process FIG. 2 shows an outline 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 (structural material) made of H-shaped steel (of course, it can be used for other purposes). In this usage example, the shaft 2 of the fastener body 1 has entered the base material B only up to the midway portion thereof, and the washer 4 is held by the tapered midway portion 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.

(4). Other embodiment (FIG. 4)
FIG. 4 shows another embodiment. Among these, (A) is a second embodiment. In this embodiment, in a drive-in fastener (pin, scissors) of the type that holds the workpiece with the head 3, the metal foil 6 is conductive on the seating surface of the head 3. It is pasted with an adhesive.

  (B) and (C) show a third embodiment applied to a connection fastener (connection pin). (A) is a partial front view, (B) is a partial plan view of the washer 4. In this embodiment, a large number of washers 4 arranged in a row are connected via a bridge portion 11 that can be shredded, and a metal foil 6 is conductive on the surface of the washer 4 opposite to the head 3. It is pasted with an adhesive. The connecting fasteners are loaded into a driving tool magazine and driven one by one into the workpiece.

(5). Others The present invention can be embodied in various ways other than the above embodiment. For example, the fastener is not limited to a drive-in type, and the type and form such as a screw-in type such as a bolt or an expandable type are not limited. Moreover, when a fastener is provided with a washer, it is also possible to affix metal foil on both surfaces of a washer.

It is a figure which shows the fastener which concerns on 1st Embodiment. It is a figure which shows the manufacturing process of a washer. It is a figure which shows the use condition of a fastener. It is a figure which shows other embodiment.

Explanation of symbols

W Steel plate work B Steel base material 1 Fastener body 2 Fastener shaft 3 Fastener head 4 Washer 8 Conductive adhesive layer 9 Material plate 10 Material metal foil

Claims (4)

It is a fastener that is used to fasten a workpiece to a base material, and a metal foil that has a higher ionization tendency than the seat surface and the workpiece is attached to the seat surface that holds the workpiece.
Metal fastener. The fastener includes a main body having a shaft and a washer that is fitted and mounted on the shaft of the main body, and the metal foil is attached to a seating surface that holds a workpiece out of both surfaces of the washer with a conductive adhesive. ing,
The metal fastener according to claim 1. A washer that is pressed against the surface of the workpiece, and a metal foil that has a higher ionization tendency than the seat surface and the workpiece is pasted on the seat surface that holds the workpiece out of both surfaces.
Washer. A method for producing a washer according to claim 2 or claim 3,
Prepare a material plate with an area that can take a large number of washers and a material metal foil that can be applied to almost the entire surface of the material plate. Before punching the washer from the material plate, attach the material metal foil to the material plate. It is characterized by
Washer manufacturing method.

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