JPH0744358U - Fasteners for welding - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Welding that can reliably weld the fastener and the welded member, and that can reduce the size of parts by eliminating the need to regulate the mounting direction of the fastener. For fasteners. [Structure] A flange 15 projecting from a seat surface side edge of a peripheral surface 12 of a cylindrical body or a columnar body is partially pressed to the seat surface 14 side to hang a projection portion 16 for resistance welding. If the fastener is a welding fastener that is installed and the inner surface of the protrusion is formed to incline downward toward the outer peripheral side of the collar, a large number of serrations are formed on the peripheral surface of the cylindrical body or the cylindrical body. When providing the undulations, a groove may be provided at the lower end of the protrusion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fastener such as a nut or a bolt for welding a welded member such as an iron plate.

[0002]

[Prior art]

 A conventional welding fastener, for example, shows an example of a welding nut in FIG. 8, which has a shape in which a quadrangular or hexagonal corner portion is pressed to the seat surface side and a protruding portion a is vertically provided. When the welding nut is welded to the member to be welded, as shown in FIG. 9, the protrusion a is brought into contact with the member to be welded such as the iron plate b to apply a voltage to melt the protrusion a. Done by

[0003]

[Problems to be solved by the device]

 The conventional technology has the following problems. <A> In the rectangular fastener as described above, the corner portion is pressed to form the protrusion a, and the pressing distance is substantially equal to the height of the fastener. Therefore, a large amount of material is moved by pressing, and a large pressing force is required, and as shown in FIG. 8, the peripheral edge portion c of the seating surface is bent by pulling both ends thereof, and thus is curved. Therefore, as shown in FIG. 9, when the fastener is welded to the iron plate b, a gap d is generated between the peripheral edge portion c of the seat surface and the iron plate b, which causes a decrease in the welding force.

<B> Further, in the case of the rectangular fastener, it is necessary to consider the mounting direction, but in a mass production line, it is actually difficult to regulate the mounting direction for each part. Therefore, a large seat surface is required on the welded member side such as an iron plate that allows mounting in any direction, which causes the size of the component to increase.

[0005]

[Purpose of the present invention]

 The present invention has been made in order to solve the above problems, and it is possible to reliably weld a fastener and a member to be welded to each other, and it is not necessary to regulate the mounting direction of the fastener, so It is an object of the present invention to provide a welding fastener that can be downsized.

[0006]

[Means for Solving the Problems]

 That is, according to the present invention, a brim projecting from the edge of the peripheral surface of a cylindrical body or a cylindrical body on the bearing surface side is partially pressed to the bearing surface side, and a protrusion for resistance welding is hung vertically. , A welding fastener. In addition, if the inner surface of the protrusion is formed by inclining downward toward the outer peripheral side of the flange, and if a large number of serration-like undulations are provided on the peripheral surface of the cylindrical or cylindrical body, A groove may be provided at the lower end of the part.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a nut having a cylindrical shape will be described, but it is needless to say that the present invention can be configured by similarly providing a collar and a protrusion on the head of a bolt having a cylindrical shape.

The shape of the nut 1 is a cylindrical body having a screw hole 11 in the center, as shown in FIGS. On the peripheral surface 12 of the cylindrical body, as shown in FIG. 1, a large number of serrated undulations 13 may be provided in the vertical direction. The undulations 13 increase the surface area of the peripheral surface 12 to enhance the heat radiation effect during welding, and also have a rotation preventing function during screw processing.

As shown in FIG. 1, a flange 15 protruding in an annular shape is provided at an end edge portion of the peripheral surface 12 on the seat surface 14 side. The diameter and thickness of the collar 15 need only be large enough to form a protrusion, which will be described later, and thus may be as large as an ordinary washer.

Further, the flange 15 is partially pressed to the seat surface 14 side, and a protrusion portion 16 for resistance welding is vertically provided. According to the present invention, the protrusion 16 can be formed only by pressing the collar 15, and unlike the conventional rectangular fastener, it is not necessary to press a distance substantially equal to the height of the nut, and a large press force is not required. Therefore, it is possible to prevent the peripheral portion of the seat surface 14 from being curved.

The number and the amount of protrusions 16 are set in advance so that the nut 1 and the member to be welded can be reliably welded when the protrusions 16 are melted. FIG. 3 is a plan view of the nut 1, and FIG. 4 is a bottom view thereof. In this embodiment, the protrusions 16 are provided at four equal intervals.

As shown in FIG. 5, the inner surface of the protrusion 16 may be inclined downward toward the outer peripheral side of the flange 51 to form the taper surface 17. By providing the tapered surface 17, the protrusion 16 can be provided at a position separated from the screw hole 11, and the material of the melted protrusion 16 can be flown to the outside.

Although the fastener of the present invention is configured as described above, since it has a very simple shape, it can be processed by cold forging. Therefore, improvement in rigidity due to work hardening can be expected.

[0014]

[Action]

 The fastener configured as described above has the following operation. <A> As shown in FIG. 5, the fastener of the present invention has the same cylindrical wall thickness L1 as that of the conventional rectangular nut shown in FIG. The nut strength of Therefore, the material for the corners of the square nut is not needed, and the material cost can be significantly reduced.

Moreover, since the protrusion 16 is formed on the flange 15, the distance L3 from the tip of the protrusion 16 shown in FIG. 5 to the screw hole 11 and the distance from the tip of the protrusion a shown in FIG. 8 to the screw hole are shown. The distance L4 can be made equal. Therefore, in terms of being able to sufficiently separate the screw portion and the protrusion portion 16, the effects of both are comparable.

<B> FIG. 2 shows a state in which the nut 1 configured as described above is welded to the iron plate 2. In the welding method, the protrusion 16 is brought into contact with the iron plate 2, and a voltage is applied between the iron plate 2 and the nut 1 by electric resistance welding and a strong pressure is applied. As a result, a large current flows between the protruding portion 16 and the iron plate 2, so that the contact portion between them has a high temperature and the protruding portion 16 is melted and welded.

At this time, since the projection 16 is provided with the tapered surface 17, the melted material flows outward to form the welded portion 3. Therefore, the high-temperature molten material is separated from the threaded portion, so that the heat transferred to the threaded portion can be reduced.

<C> In the nut 1 having a cylindrical body as in the present invention, the peripheral edge of the seat surface 14 is not curved during the manufacturing thereof. Therefore, the seat surface 14 and the iron plate 2 can be welded together without a gap, and the welding strength can be increased.

[0019]

[Other Examples]

 As shown in FIG. 7, a required number of grooves 18 may be provided at the lower end of the protrusion 16. By providing the groove 18, the contact area between the protrusion 16 and the member to be welded can be reduced, the initial melting rate can be increased, and the heat capacity can be reduced.

[0020]

[Effect of the present invention]

 Since the present invention has been described above, the following effects can be obtained. <B> Since the protrusion can be manufactured without bending the peripheral portion of the seat surface of the fastener, the seat surface and the member to be welded can be welded without a gap, and the welding strength can be increased.

<B> Since the outer shape of the fastener is round, the direction is not restricted, the welding work is facilitated, and the main body of the component on which the fastener is mounted can be downsized, which is an inexpensive and lightweight structure. It can be a body.

<C> Even if the thickness of the fastener of the present invention is the same as the thinnest portion of the conventional square nut, the same nut strength can be obtained. Therefore, the material for the corners of the square nut is not needed, and the material cost can be significantly reduced. Moreover, since the projecting portion is formed on the flange, the effects of both are comparable to each other in that the distance between the screw portion and the projecting portion can be sufficiently separated. Actually, when comparing the conventional square nut and the round nut of the present invention, the material can be reduced by about 25%, and the overall cost of mass-produced products such as fasteners can be greatly reduced. Becomes

<D> The protrusion is provided on the flange, and is tapered and separated from the screw so that the material of the protrusion melted during welding flows to the outside. Therefore, it is possible to reduce the heat transferred to the screw portion during welding. Therefore, the deformation of the screw portion due to thermal strain can be prevented, and the quality of the nut and the bolt can be improved by maintaining the accuracy of the screw portion. Further, since the collar is provided, the structural strength of the fastener can be increased.

<E> By providing serration-like undulations on the peripheral surface to increase the surface area, it is possible to enhance the effect of radiating heat during welding. Therefore, the heat transmitted to the screw portion can be reduced. In addition, it will also have a function to prevent the nut from turning during thread processing.

<F> By providing a groove at the lower end of the protrusion to reduce the contact area between the protrusion and the member to be welded, the initial melting rate can be increased and the heat capacity can be reduced. Therefore, it is possible to reduce the heat transferred to the screw portion and improve the production efficiency.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the fastener of the present invention.

FIG. 2 is an explanatory diagram showing a welded state

FIG. 3 is a plan view of an embodiment of the fastener of the present invention.

FIG. 4 is a bottom view of an embodiment of the fastener of the present invention.

5 is a sectional view taken along line AA of FIG.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is an explanatory diagram of another embodiment.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is an explanatory diagram of a conventional technique.

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[Procedure amendment]

[Submission date] January 25, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideki Sakuragi, 560-2 Okazu Furuhisa, Atsugi City, Kanagawa Prefecture Nissan Motor Co., Ltd. Within Yorozu Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A flange for projecting on a seat surface side edge portion of a peripheral surface of a cylindrical body or a columnar body is partially pressed to a seat surface side to vertically hang a projection for resistance welding. , Fasteners for welding. 2. The welding fastener according to claim 1, wherein the inner surface of the protrusion is formed so as to be inclined downward toward the outer peripheral side of the collar. 3. The fastener for welding according to claim 1, wherein a large number of serration-like undulations are provided on the peripheral surface of the cylindrical body or the cylindrical body. 4. The welding fastener according to claim 1, wherein a groove is provided at the lower end of the protrusion.