JPH0791428A - Jointing of tightening mechanical element - Google Patents

Abstract

PURPOSE:To fix temporarily in simple manner a tightening member, or a fitting member fixed by a tightening member, and prevent mutual separation of a male screw member and a tightening member when tightening the male screw member by the inner hole edge of a through hole fitting to the shaft portion of the screw portion of the male screw member due to the fixing pressure. CONSTITUTION:A through hole 8 of a tightening member 2 fixed by a shaft portion 3a, a screw portion 3 of a screw member and a protrusion member 6 is treated in curved face by curving, bending, or the like, or the tightening member 2. A fitting edge 9 is formed in the fixation. The holding is thus obtained by mutually fitting the fitting edge 9 and the shaft portion 3a, the screw portion 3 and the protrusion member 6. Then, the position curved-face treated is smoothed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting a fastening member used for assembling or connecting articles.

[0002]

2. Description of the Related Art Conventionally, in order to assemble or connect articles, fastening with a fastening body such as a bolt is generally used. When the bolt is prevented from loosening or the seat on which the bolt abuts is unstable or weak, Various washers are used together with bolts for abutting on a wide surface and for supporting the bolt head when the bolt hole is large.

This washer is used in order to improve workability during transportation or storage during distribution or fastening during distribution, as shown in FIG. 17 (a).
As shown in Fig. 17, the lower part 21 of the bolt 20 is lifted up by rolling or the like, and the washers 23 and 24 are fitted to the part having a smaller diameter than the screw part 22, or as shown in Fig. 17 (b). As described above, it may be integrated with the bolt 20 to be used by caulking it to the seat surface 26 of the bolt head 25.

However, in the case shown in FIG. 17 (a), since the number of steps for rolling the bolt 20 is increased, the product cost soars that it cannot be offered on the market at a low cost, and the washer 23 , Each time the combination of 24 changes, the mechanical jig is also replaced, so the work is troublesome, and the neck portion 21 made thin is not strong enough for stable fastening, and the screw portion 22 Since it does not exist, it cannot be used for fastening thin attachment members.

Further, in the case shown in FIG. 17 (b), the washer 23 is
Since it is temporarily fixed to the bolt 20 by caulking, the bolt
Due to burrs or the like generated in the washer 23 during press forming as the 20 rotates, when the front and back of the washer are not selected, a scratch is left on the mounting member surface when tightened.

In particular, the above-mentioned ones cannot be replaced with another type of washer for fastening and use.
In other words, since the washer cannot be removed from the shaft or screw, it is uneconomical to prepare a bolt washer set of another type according to the purpose of use and its location. Moreover, the washer itself does not allow temporary temporary fixing to the shaft or screw of the bolt, so when the nut is screwed in the downward position, the washer may drop from the screw as it is. Will end up. In addition, in the case of fastening in places where it is difficult to reach or where the work posture is not good, a large labor burden is imposed on the worker and it is not preferable in terms of occupational health. Etc. have various problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and a through hole of a fastening member to be fitted into a thread diameter of a male screw body is formed in a curved shape of the fastening member. Alternatively, the curved edge is formed by bending or the like and the locking edge is formed by sandwiching it, and the threaded portion of the male screw body is engaged with and held by the locking edge, and then the curved edge is smoothed. With this shape, the fastening member, or the mounting member sandwiched between the fastening members and the fastening member itself can be temporarily fixed, and at the time of tightening the male screw body, due to the holding pressure,
An object of the present invention is to provide a method for assembling a fastening mechanical element in which an inner edge of a through hole is locked to a shaft portion or a thread portion of a male screw body to prevent separation of the male screw body and a fastening member.

[0008]

Means for Solving the Problems The means of the present invention for achieving the above object comprises a male screw body and a fastening member having a through hole that engages with the male screw body. A method of coupling a mechanical element for fastening in which the male screw body is integrated by engagement, in the step of performing curved surface processing on the fastening member by bending, bending or twisting, distortion, and the through hole. A step of forming a locking edge by a sandwiching hole formed by bending, bending or twisting, distortion, pressing, heating, etc., and inserting the locking edge by inserting the shaft portion or the screw part of the male screw body and the through hole A step of temporarily fixing the male screw body and the fastening member integrally by contacting with the shaft portion or the screw portion, and making the curved surface processing of the fastening member smooth so that the inner edge of the through hole projects inward. A step of engaging with the shaft part or the thread part of the body to promote temporary fixing of the screw body and the fastening member. It was there to join method of fastening machine elements.

Further, the above-mentioned external thread body may employ an internal thread body having a projection attached to the outer peripheral surface of the internal thread diameter on its seat surface.

Further, the fastening member is obtained by punching out the outer shape and the through hole from a flat plate material at the same time to form a fastening member, and at the time of punching, bend, bend or twist the seat surface of the fastening member. In some cases, a curved surface is processed by distortion or the like, and the through hole is formed with an inner peripheral edge having substantially the same diameter so that it can be inserted into the shaft portion or the screw portion of the male screw body.

Further, in the step of forming the locking edge in the through hole, a curved back springback for the fastening member is also adopted.

[0012]

The present invention configured as described above has the following operations.

The periphery of the through hole in the fastening member is subjected to curved surface processing which is not smooth due to bending, bending, twisting, distortion or the like.

Further, the through hole of the fastening member is formed to have substantially the same diameter so that it can be inserted into the shaft portion and the screw portion of the male screw body.
The through hole is formed with a locking edge protruding inward by a nipping hole formed by bending, bending or twisting, distortion, heating or the like.

When the through hole of the fastening member and the male screw body are inserted and the locking edge of the fastening member is brought into contact with the shaft portion or the screw portion of the male screw body, the male screw body and the fastening member are separated from each other. It is temporarily fixed integrally, and during assembly work and transportation, the fastening member and the male screw body are connected and never separated during normal handling. For example, if the fastening member and the male screw body are pulled out by hand or the like, they can be easily replaced or replaced.

In this state, for example, when the threaded portion of the male screw body is screwed into the female threaded portion of the female threaded member and the two are tightened, the curved surface of the fastening member is smoothed by the pressing. At this time, the inner edge of the through hole protrudes inward due to the restoration of the curved surface processing and narrows the inner diameter, so that the narrowed peripheral edge is locked to the shaft portion and the screw portion of the male screw body, so The temporary fixing with the fastening member is promoted, and it is not easily separated from the shaft portion and the screw portion.

At this time, the engagement between the screw body and the fastening member is ensured so that the two are not separated from each other, and the engagement between the screw body and the fastening member is released as necessary, and another screw body or The fastening member can be exchanged, and any one of the engagements can be appropriately selected depending on the protruding amount of the locking edge formed in the through hole of the fastening member.

The above-described operation is similarly performed even with the fastening member which engages with the projection of the female screw body.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a fastening mechanical element coupling method according to the present invention.

1, FIG. 3, FIG. 6, FIG. 13 and FIG. 16A shows a set of fastening mechanical elements composed of two members, which is a screw body 1 by a male screw body 1M or a female screw body 1F.
Basically composed of (1M, 1F) and fastening member 2.

The fastening mechanical element set A is
It is used for assembling or connecting articles, etc., and these two members 1 and 2 (in some cases, another fastening machine element or a mounting member described later is sandwiched between the two members) are set. It is distributed and stored in.

Of these, when the male screw body 1M is adopted in the above-mentioned screw body 1, the screw portion 3 having a predetermined pitch is provided on the outer periphery.
As long as it is formed, a conventional one or a special one specially molded is applied.

For example, if some of the general types are shown, metal or synthetic resin having a head 4 at one end as shown in FIGS. 1 (a) to 1 (c), or There are bolts, screws, etc. molded from other materials, and as shown in Fig. 1 (b), a male screw body 1M having a shaft portion 3a of a non-threaded portion under the head 4, and Fig. 1 (d). As shown, a coiled spring having a threaded portion 3 on the outer circumference is also used. However, as described above, this male screw body 1M is a special bolt or screw such as a separately processed screw body or a headless screw body. , Studs, anchors, etc., which are not particularly limited in shape, type, screw pitch, or use place.

Further, in the screw body 1 described above, a female screw body
In the case of 1F, as shown in FIG. 2, a female screw portion 5 to be screwed with another screw or the like is screwed, and a projection is formed on the seat surface at the outer periphery of the screw diameter of the female screw portion 5. A body 6 is attached.

The projection 6 is annular to the seating surface of the internal thread 1F and is provided in a continuous cylindrical shape as shown in FIG. 2 (a), or intermittently as shown in FIG. 2 (b). Plural pieces are projected on.

The shape of this internal thread body 1F is shown in FIG. 3 (a).
~ (D), for example, metal or synthetic resin,
Alternatively, a nut formed of another material, a screw body 1F that is specially processed, or a special nut is adopted, and the shape and type, the screw pitch, and the place of use are not particularly limited.

Next, the fastening member 2 is the screw body 1
And a female thread member 11 such as a nut, when the mounting member 7 or the like described later is fastened in a tightened state, it is sandwiched between the both 1, 5 and one side surface thereof is the screw body 1 or the female body. It contacts the surface of the screw member 11.

The shape may be a conventional washer (including a special one) as shown in FIG. 4, or various types as shown in FIGS. 5 (a) and 6 (a), (b). Components for fittings and articles used in the industry as appropriate, components for structures such as buildings and their accessories, box-shaped cases, furniture and other components, or metal, non-ferrous metal or synthetic resin It is used in a wide range of fields, such as packing by means of the above, and as shown in FIG. 5 (b), such as plate terminals for electrical connection.

As shown in FIG. 6 (c), the mounting member 18
A male screw body 1M protruding from one side may be used.

Then, in place of the fastening member 2, the shaft portion 3a and the screw portion 3 of the male screw body 1M in the screw body 1 described above.
Or a through hole 8 which is slightly larger in diameter than the external shape of the projection 6 of the female screw body 1F and is formed into a substantially perfect circle, an ellipse, an oval, or the like.
Is provided.

This fastening member 2 is to be combined with the above-mentioned screw body 1 and is subjected to various pre-processing in order to form a fastening mechanical element set A that serves as a retaining member.
As a first step, a curved surface processing step is performed.

This curved surface processing step is performed by bending, bending or twisting, distortion, etc., and is a secondary processing performed after the fastening member 2 is molded, or is performed simultaneously with the molding of the fastening member 2 as described later. It is provided on a part or the entire circumference of the peripheral portion of the through hole 8 or on the entire seat surface of the fastening member 2, and as curved surface processing means, pressing means such as roller hooking or Any pressing means such as a press, a vise or the like is used.

By this step, in the case of the above-mentioned secondary processing, the smooth state shown in FIG. 7A is formed into an arc shape or a dish shape as shown in FIG. 7B.

Further, the through hole 8 of the fastening member 2 has the shaft portion 3a and the screw portion 3 of the male screw body 1M of the screw body 1 or the female screw body in the state after the above-mentioned curved surface processing.
As shown in FIG. 7 (b) (in this example, the threaded portion 3 of the male threaded body 1M is shown) with respect to the axial direction of the projection body 6 of 1F, or the shaft portion is bored substantially in parallel. 3a, the threaded portion 3, and the insertion side of the projection 6 as shown in FIG. 8 (in this example, the projection 6 of the internal thread body 1F is shown) are formed to have an acute angle or a projection. Is.

Then, in the through hole 8 of the curved fastening member 2, a locking edge is provided by pressing means such as roller hooking and pressing, or an arbitrary pinching means (not shown) such as a press or a vise. The step of forming 9 is performed.

In processing the locking edge 9, the example shown in FIGS. 9 (a) to 9 (c) and FIG. 10 (a) which further protrudes toward the curved surface with respect to the curved surface , Fig. 9 (d) to (f) and Fig. 10 for pressing the curved surface
There is an example shown in (b).

Of these, the former is, for example, as shown in FIG. 9 (a), curved, distorted or bent, punched out or the like, or, as shown in FIG. 9 (b), twisted or wavy. As shown in FIG. 9C, a bulging process for raising the periphery of the through hole 8 is performed.

In the latter example, as shown in FIG. 9 (d),
Rolling or pressing is applied to curved surface processing to bend, distort or bend a part of it, or as shown in Fig. 9 (e), roller processing or pressing pressure is applied to curved surface processing. 9) to restore a part of the surface to a smooth shape, or as shown in FIG. 9 (f), to apply curved surface processing such as roller hooking or pressing to restore a substantially smooth surface. Although not shown, this is done by pressing the entire periphery of the through hole 8 slightly flat.

Further, the deformation of the through hole 8 caused by heating the fastening member 2 may be utilized.

The portion of the fastening member 2 to be subjected to the above-mentioned processing is one or a plurality of portions around the through hole 2,
Alternatively, it is done over its entire surface.

In particular, when the engaging edge 9 of the through hole 8 is formed so that a step s is provided between the side edge on one side and the side edge on the other side, as shown in FIG. When the fastening member 2 is inserted into the threaded portion 3 of the male screw body 1M in the temporary fastening process between the fastening member 1 and the fastening member 2, the locking edge 9 is engaged with the threaded portion 3 due to the difference in gravity of the entire body. In this case, the fastening member 2 does not easily separate due to its own weight when the fastening member 2 is directed downward or forcible pulling, and the fastening mechanical element set A is formed. It is performed depending on whether the threaded portion 3 is engaged with the threaded portion 3 or loosely engaged with the threaded portion 3.

As the engaging edge 9, a natural burr formed by punching with a press or the like when forming the through hole 8 can be used, and a spring washer as shown in FIG. In the case of the fastening member 2 using a strain washer or the like as shown in (d), it may be due to a natural strain that is formed by winding in a coil shape during shaping, or a strain that is produced when cutting individual pieces.

Then, when temporarily fixed in the loose state,
For example, as shown in FIG. 11, when the end portion of the threaded portion 3 of the male screw body 1M is directed upward and the fastening member 2 is inserted from this end with the curved side thereof facing downward, the fastening member 2 It swings due to the difference in the center of gravity and falls along a slight gap, and when it abuts the seat surface of the male screw body 1M, the locking edge 9 of the through hole 8 engages with the screw portion 3, Two members as described above
1M and 2 do not come off easily.

Further, in the case of temporary fixing by screwing, when the through hole 8 is turned so that the locking edge 9 of the fastening member 2 is hooked on the screw portion 3 of the male screw body 1M, both of them are screwed.
M and 2 are engaged with each other and are not easily disengaged from each other, and any of them is attached to the fastening member 2 or the fastening member 2 and the female screw body 1 at an arbitrary position of the threaded portion 3. Is temporarily fixed.

Further, the through hole 8 provided in the fastening member 2 is
As shown in (a) and (b) of FIG. 12, the fastening member 2
It may be provided eccentrically with respect to, or may be provided in the shape of a slot as shown in FIG. 12 (c) or in the shape of a slit as shown in FIG. 12 (d).

Then, in the step of connecting the male screw body 1 and the fastening member 2, the curved surface of the fastening member 2 is made smooth so that the inner edge of the through hole 8 projects inward, and the shaft portion 3a of the male screw body 1M. This is done by locking the threaded portion 3 or the projection 6 of the female screw body 1F.

This operation is performed, for example, by inserting the threaded portion 3 of the male screw body 1M in the fastening machine element set A into the mounting holes 10 and 10 of the mounting members 7 and 7 as shown in FIG. 13 (a). , Figure
As shown in FIG. 13 (b), when the female screw member 11 is screwed into the screw portion 3 and the mounting members 7 and 7 are tightened, the curved surface is restored to a smooth state by this pressing force, and the fastening member 2 Since the inner edge of the through hole 8 in FIG. 2 projects inward and narrows the inner diameter, the narrowed peripheral edge is locked to the screw portion 3 of the male screw body 1M, so that the male screw body 1M and the fastening member 2 are joined together. The temporary fixing becomes more reliable, and the fastening member 2 does not easily come off from the screw portion 3.

The connecting step between the male screw body 1 and the fastening member 2 is performed by tightening only the fastening member 2 by appropriate means, in addition to tightening the female screw member 11. .

In this example, although not shown, for example, a mechanical element set A for fastening to a screw is provided because it is provided on a mounting member or the like.
To tighten the male thread by tightening it,
Needless to say, this is done by planting.

In this connecting step, the screw body 1 (1M, 1F) and the fastening member 2 can be securely engaged with each other so that they are not separated from each other. And fastening member 2
It is possible to release the engagement with and to replace the other screw body 1 (1M, 1F) or the fastening member 2, and the protrusion amount of the locking edge 9 formed in the through hole 8 of the fastening member 2, That is, by engaging a desired overhang in the step of forming the locking edge 9, any one of the above engagements can be appropriately selected.

Further, when the seat surfaces of the male screw body 1M and the female screw body 1F are formed in the shape of an inclined plate, when these are tightened, the pressing of curved surface processing by this inclined surface is promoted.

Next, in the method of the embodiment of the present invention, each step described above will be described when forming the washer which is the fastening member 2 from the flat plate material w.

In this example, the washer 2 is molded and the curved surface is processed at the same time. First, as shown in FIG.
When a flat plate material w is supplied to the upper die 13 and the lower die 14 in 12 and the press machine 12 is operated, its outer shape and the through hole 8 are punched at the same time to form a circular washer 2.

At this time, as shown in the same figure, the inclined portion 16 having a predetermined angle which is an outer gradient is formed in the cut portion of the lower die 14, so that when the upper die 13 and the lower die 14 are pressed. , Washer 2
A curved curved surface is formed on the seat surface of.

The inclined surface 16 of the cut portion can be arbitrarily set in accordance with a desired curved surface processing, and may further have an arc surface or a ridge portion such as a convex portion.

The punched through hole 8 has substantially the same diameter so that it can be inserted into the shaft portion 3a and the screw portion 3 of the male screw body 1M, and is substantially parallel or curved to the axial direction of the male screw body 1M. The taper shape has an acute angle.

In this state, the washer 2 is provided with a step of forming the locking edge 9, and as described above, pressing means such as roller hooking and tapping, or an arbitrary pinching pressure such as a press or a vise. By means of a means (not shown), the locking edge 2 is formed by a bending, bending or twisting, distortion, pressing, heating or the like.
Is formed.

The engaging edge 2 is inserted into the shaft portion 3a and the screw portion 3 of the male screw body 1M or the protrusion 6 of the female screw body 1F so as to slightly bite.

In the molding of the locking edge 9, a part of the curved surface is returned by spring back generated after molding of the washer 2 by pressing or the like, and the through hole 8 is in a state of substantially the same diameter as the shaft portion 3a and the screw portion 3. It is also possible to adopt a method in which the locking edge 9 is formed in this portion as a sandwiching hole.

When this washer 2 is applied to the end of the threaded portion 3 of the male screw body 1M and the through hole 3 is inserted, the locking edge 9 contacts the screwed portion 3 and the male screw body 1M and the washer 2 are inserted. And are temporarily fixed together to form a fastening mechanical element set A.

In this state, as shown in FIG.
By tightening 1M and the female screw member 11 that is screwed to this, the seat surface of the washer 2 that has been curved is made smooth, so that the inner edge of the through hole 8 projects inward and its inner diameter is narrowed. As a result, the male screw body 1M is engaged with the threaded portion 3 so that the male screw body 1M and the washer 2 are temporarily fixed to each other and are joined together.

Therefore, when the fastening machine element set A is used for installing and fixing a machine or the like, for example, in the preliminary assembly of the test performed in advance, the male screw body 1M and the washer 2 are coupled by the above-described steps. Is done,
After this temporary assembly, in the main assembly of a machine or the like in the field, etc., the fastening mechanical element set A that has been unscrewed once
Since the locking edge 9 of the washer 2 is securely engaged with the threaded portion 3, the both 1 and 2 are integrated without being separated, and their handling is extremely good.

The fastening machine element set A formed as described above has a male screw body 1M as shown in FIG. 1 (a).
Between the fastening members 2 connected to the spring washer 17
It is also possible to interlock with them and temporarily fix them integrally.

Similarly, the female screw body 1F can also have a spring washer 17 (a mounting member, a heat insulating material, a protective material, etc.) interposed therein. In this case, as shown in FIG. The locking edge 9 formed on the side may be further extended outward and may be fitted to the protrusion 6 of the female screw body 1F. The spring washer 17 may also cover the locking edge 9. is there.

Furthermore, when the washer 2 is molded and the curved surface is processed at the same time by a pressing machine or the like, it is possible to form the locking edge 9 in one step in this pressing step. Alternatively, both the molds are provided with means capable of performing the processing.

[0066]

As described above, according to the present invention, the through hole portion of the fastening member is temporarily processed into a screw body together with the fastening member or the mounting member by a simple process such as bending, straining, bending or twisting, and heating. Since it can be stopped, the workability and handling of the members are extremely good.

Since the fastening member can be easily attached to the screw body by engagement such as screwing or loose fitting with the fastening member, even if the type of the screw body is changed, it can be immediately replaced in the field. In addition, it is economical because it is not necessary to prepare a large number of fastening members that are a set of screw bodies and fastening members for each work, and it is easy to store and manage inventory. .

Since the threaded body is not subjected to additional processing for supporting the fastening member, screwing up to the seat surface of the bolt head does not occur because of insufficient fastening due to insufficient strength. Therefore, even a thin mounting member can be securely fastened.

Particularly, since this fastening member is integrally connected to the screw body as the screw body or the female screw member is tightened,
When once removing the tightened screw body and reusing it,
Since the screw body and the fastening member are not separated from each other, the fastening member can be prevented from being lost, and the fastening work and handling thereof can be improved. It has special effects such as.

[Brief description of drawings]

FIG. 1 shows each example of a fastening machine element set adopted in a fastening method for fastening machine elements according to the present invention.
(a) is a front view consisting of a threaded body with full screw bolts,
(b) is a partially cutaway front view of a threaded body with a bolt having a shaft, (c) is a partially cutaway front view when the threaded body is a screw, and (d) is a coiled spring body. It is a partially broken front view in the case.

FIG. 2 is a bottom view showing each example of the female screw body when the screw body in FIG. 1 is a female screw body.

FIG. 3 is a partially cutaway front view showing an example in which the threaded body in FIG. 1 is a female threaded body of a nut.

FIG. 4 is a perspective view showing each example of the fastening member in FIG.

FIG. 5 is a perspective view showing another example of the fastening member in FIG.

FIG. 6 is a schematic view showing still another example of the fastening member in FIG.

7 is a cross-sectional view showing a curved surface processing state of the fastening member in FIG.

8 is a cross-sectional view showing a state in which the fastening member in FIG. 7 is engaged with the female screw body 1F.

9 is a perspective view showing each example of a state in which a locking edge is formed in the through hole of the fastening member in FIG.

10 is a sectional view showing still another example of FIG.

11 is an explanatory view showing an engaged state of the fastening member in FIG. 1 with the screw body 1. FIG.

FIG. 12 is a plan view showing still another example of the fastening member in FIG.

13 is a vertical cross-sectional view showing a connection state between the fastening member and the screw body in FIG. 1, (a) showing before fastening and (b) showing after fastening.

FIG. 14 is an explanatory view showing a molded state of the fastening member in FIG.

15A and 15B are views showing a state where the fastening member in FIG. 1 is spring-back, in which FIG. 15A is a plan view and FIG. 15B is a sectional view.

16 is a partially cutaway front view showing an example of a state in which the set in FIG. 1 is connected by three members.

FIG. 17 is a front view showing a set state of a conventional bolt and washer.

[Explanation of symbols]

 1M Male thread 1F Female thread 2 Fastening member 3 Screw 3a Shaft 6 Projection 8 Through hole 9 Locking edge w Plate

Claims (4)

[Claims] 1. A method of coupling a fastening mechanical element, which comprises a male screw body and a fastening member having a through hole that engages with the male screw body, and which is integrated by engaging the through hole and the male screw body. There is a step of performing a curved surface processing on the fastening member by bending, bending or twisting, distortion, etc., and a locking edge is formed in the through hole by a nipping hole by bending, bending or twisting, distortion, pressing, heating, etc. And the step of forming the male screw body and the screw portion and the through hole are inserted, and the locking edge is brought into contact with the shaft portion or the screw portion to integrally form the male screw body and the fastening member. The step of temporarily fixing and smoothing the curved surface processing of the fastening member so that the inner edge of the through hole is projected inward and locked to the shaft portion or screw portion of the male screw body to temporarily secure the screw body and the fastening member. And a step of accelerating the stop. 2. A female thread body having a projection attached to the outer periphery of the female thread diameter on the seat surface, and a fastening member having a through hole engaging with the projection of the female thread body. A method of connecting a fastening mechanical element that is integrally formed by engaging with a female screw body, comprising: a step of performing curved surface processing by bending, bending or twisting, distortion, etc. on the fastening member, and bending the through hole. , A step of forming a locking edge by a nipping hole formed by bending or twisting, distortion, pressing, heating, etc., and fitting the projection body and the through hole together to temporarily integrate the female screw body and the fastening member. The step of stopping and the curved surface processing of the fastening member are made smooth so that the inner edge of the through hole is projected inward and locked to the projection of the female screw body to promote temporary fixing of the female screw body and the fastening member. And a step of connecting mechanical elements for fastening. 3. The fastening member is formed by punching the outer shape and the through hole of a flat plate material at the same time to form a fastening member, and at the time of punching, bends, bends or twists the seat surface of the fastening member. 3. The curved surface is processed by distortion or the like, and the through hole is formed so that the inner peripheral edge thereof has substantially the same diameter so that it can be inserted into the shaft portion or the screw portion of the male screw body. Method of connecting mechanical elements for fastening. 4. The method for coupling a fastening mechanical element according to claim 1, wherein the step of forming the locking edge in the through hole is performed by a spring back of curved surface processing for the fastening member.