JP2973134B2 - Manufacturing method of self-aligning nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a self-aligning nut in which a pair of nuts having an abutting plate that abuts each other are housed in a cover.

<Conventional technology> Generally, a nut called a bag-type self-aligning nut is a ninth type.
It has a structure as shown in the figure.

That is, a pair of self-aligning nuts d having a cross section formed by a nut portion b having a threaded hole a and an abutment plate c and having a blade plate shape.
Are arranged such that the abutment plates c face each other, and the cover e
It is a structure to be stored inside.

The method of use is to fix the cover e of the nut having the above structure to the mounting plate f in which bolt holes g such as long holes are opened at predetermined intervals.

Then, the bolt h is screwed into the screw hole a of the one self-aligning nut d and positioned, and the abutting surfaces i of the abutting plates c are brought into abutment.

As a result, the distance between the axes of the screw holes a of the two self-aligning nuts d can always be kept constant, so that the position of the screw hole a of the other self-aligning nut d is automatically determined. You can do it.

<Problems to be Solved by the Present Invention> Generally, in the conventional self-aligning nut d, as shown in FIG. 8, a nut portion b and an abutment plate c are formed at once by forging, and thereafter, Although the screw hole a is processed, a special screw processing device is required when the screw hole a is formed in a material having such a complicated shape.

Therefore, the manufacturing cost is increased, and automation of the screw processing is difficult, which leads to a decrease in productivity.

Further, since the conventional self-aligning nut d is a block-shaped body formed by integrally forging the nut portion b and the abutment plate c, it uses more material than necessary, is uneconomical, and increases in weight. Therefore, there is a possibility that it may become an obstacle during transportation and installation.

<Object of the present invention> The present invention has been made to solve the above problems, and provides a method of manufacturing a self-aligning nut that can be easily manufactured, has a low manufacturing cost, and is lightweight. With the goal.

<Means for solving the problem> That is, the present invention provides a method of manufacturing a self-aligning nut in which abutment plates are attached to a pair of nuts, respectively, and the abutment plates are housed in a cover so as to abut each other. A mounting hole for a nut is formed in the abutment plate, and the nut is penetrated through the mounting hole of the abutment plate. A method for manufacturing a self-aligning nut, characterized in that an abutment plate is integrally held by a built-up portion.

In another aspect, a mounting hole for a nut is formed in the abutment plate, and a flange is formed on a peripheral portion of the mounting hole, while a serration portion is formed on an outer peripheral surface of the nut. A method for manufacturing a self-aligning nut, characterized in that a part is press-fitted into a flange and an abutment plate and a nut are integrally connected.

In yet another aspect, the abutment plate is provided with a mounting hole for a nut, while the nut is fitted into the mounting hole of the abutment plate, and is integrally fixed to the abutment plate by welding. This is a method for manufacturing a self-aligning nut.

<Description of the Present Invention> Hereinafter, the present invention will be described in detail.

<A> Overall Structure (FIG. 1) As shown in FIG. 1, a bag-type self-aligning nut is formed by, for example, a pair of self-aligning nuts having a structure in which an abutment plate 1 and a nut 2 are connected to each other. It is stored so that it does not fall off.

These self-aligning nuts are arranged such that the abutment plates 1 face each other and the axes of the nuts 2 are parallel.

The self-aligning nut is accommodated in the cover e so as to be movable in a direction perpendicular to the axis of the nut.

 The method of use is the same as the conventional one.

<B> Method of manufacturing self-aligning nut The self-aligning nut of the present invention is obtained by integrally mounting a separately manufactured abutment plate and a nut.
Adopt crimping method, press-fitting method by serration, and welding method.

 The details are described below.

(1) Caulking method (FIGS. 2 and 3) The abutment plate 1 is a thin plate, and a mounting hole 11 for the nut 2 is opened near one end in the longitudinal direction, and an arc-shaped abutment is provided at the other end edge. Form the surface 12.

The distance from the center of the mounting hole 11 to the apex of the arc of the abutment surface 12 is 1/2 of the distance between the axes of the pair of self-aligning nuts.

On the other hand, as the nut 2, a normal nut having a square cross section having a screw hole 21 is used.

A flange 22 that protrudes in a direction perpendicular to the nut shaft is integrally formed on the outer peripheral edge of one end of the nut 2 in the axial direction by forging.

Then, the nut 2 is passed through the mounting hole 11 of the abutment plate 1,
By caulking the penetrating end of the nut 2,
Form 23.

Thereby, the abutment plate 1 is sandwiched between the flange 22 and the overlay portion 23, and the nut 2 can be integrally attached.

As shown in FIG. 2, the integrated self-aligning nut has a distance L1 from the end face of the nut 2 to the center of the abutment plate 1.
And the distance L2 from the end face of the collar 22 to the center of the abutment plate 1,
It is good to form so that it may become equal.

By doing so, even when the bolts h are alternately inserted into the pair of self-aligning nuts from opposite directions, the abutment plates 1 can be securely abutted against each other.
The figure shows a case where the bolt h is inserted from the same direction).

Next, when the bolt h is inserted and used from both sides as described above, the nut 2 needs to secure a constant surface pressure on both end surfaces.

In this case, a constant surface pressure can be secured on one end surface of the nut 2 by the flange 22. However, since the other end surface is not provided with the flange 22, the area of the end surface of the nut 2 itself can secure a constant surface pressure. You need to use what you can.

(2) Press-fitting method by serration (Figs. 4 to 6) The abutment plate 3 is provided with the mounting hole 31 as described above,
It is a thin plate on which 32 is formed.

In particular, in the case of a press fit structure with serrations,
A flange is formed around the periphery of 31 by burring, etc.
Is provided.

In consideration of the case where the bolt h is inserted from both sides of the nut 4, the middle of the abutment plate 3 is bent toward the flange 33 so that the abutment surface 32 is located at the center of the nut 4, and the inclined portion is inclined.
34 should be formed.

Next, the nut 4 is a hollow cylindrical body having a threaded hole 41, and a flange 42 projecting in a direction perpendicular to the nut shaft is integrally formed on the outer peripheral edge of one end of the nut 4 in the axial direction by forging. .

In addition, serrations are provided on the outer peripheral surface of the nut 4 in the axial direction.
Engrave 43.

Then, as shown in FIG. 4, the nut 4 is pressed into the flange 33 of the abutment plate 3, and the flange 42 is brought into contact with the end face of the flange 33.

Thereby, the abutment plate 3 and the nut 4 can be integrally attached.

For the same reason as in the above (1), the integrated self-aligning nut is moved from the end face of the abutment plate 3 to the abutment face 32.
And the distance L4 from the end face of the flange 42 to the center of the abutment surface 32 may be formed to be equal.

In addition, as shown in FIG. 4, when the end surface of the nut 4 is not projected from the opposite surface of the flange 33 of the abutment plate 3, a constant surface pressure can be secured by the abutment plate 3.
When projecting the nut 4 from the abutment plate 3, the nut 4
It is necessary to use an object whose end surface area can secure a constant surface pressure.

(3) Welding method (FIG. 7) The butting plate 5 is a thin plate in which the mounting hole 51, the butting surface 52 and the inclined portion 53 are formed as described above.

The nut 6 has a cross-sectional shape that fits into the mounting hole 51, and forms a screw hole 61 and a flange 62 as described above.

However, the end of the screw hole 61 on the side opposite to the flange 62 is provided with an abutment plate 5.
Screw processing is not performed for the thickness of.

Then, the nut 6 is fitted into the mounting hole 51 of the abutment plate 5,
The welded portion 63 is formed by ordinary welding or projection welding, and the abutment plate 5 and the nut 6 can be integrally attached.

Also in this case, the distance L5 from the end face of the abutment plate 5 to the center of the abutment face 52 and the distance from the end face of the flange 62 to the center of the abutment face 52
It is preferable that L6 is formed to be equal.

In the case of a welded structure, the nut 6 may have a diameter equal to the diameter of the flange 62 without providing the flange 62 on the nut 6.

<Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

<A> Generally, conventional self-aligning nuts are formed by forging a nut part and an abutment plate at once, and then threading holes. In the case of processing a screw, a special screw processing device is required.

Therefore, the manufacturing cost is increased, and automation of the screw processing is difficult, which leads to a decrease in productivity.

On the other hand, the self-centering nut of the present invention is manufactured by separately manufacturing a plate-shaped abutment plate and a nut and joining them.

For this reason, screw processing can be performed on the nut before joining with the abutment plate, and a screw hole can be opened with a normal nut screw processing apparatus.

Therefore, a special screw processing device as in the related art is not required, and it is possible to reduce manufacturing costs, automate screw processing, improve productivity, and the like.

<B> In addition, the conventional self-aligning nut is a block-shaped body made by integrally forging the nut part and the abutment plate. Therefore, there is a possibility that it may become an obstacle during the transporting operation and the mounting operation.

On the other hand, in the case of the present invention, a plate-shaped abutment plate and a nut are used, and the nut only needs to be able to secure a desired surface pressure. And lightening is possible.

Therefore, it is economical, and the workability during transportation and mounting can be improved.

<C> Since the self-aligning nut of the present invention has a joint structure of the plate-shaped abutment plate and the nut, it is easy to cope with various specifications.

[Brief description of the drawings]

Fig. 1: Cross-sectional view of the bag-type self-aligning nut as a whole Fig. 2 and Fig. 3: Explanatory view of a nut having a caulked structure Fig. 4, 5a, 5b, 6a, 6b: Explanatory view of a nut having a serrated structure Fig. 7: Explanatory drawing of nut of welding structure Fig. 8 and 9: Explanatory drawing of conventional technology

Claims (3)

(57) [Claims] 1. A method of manufacturing a self-aligning nut in which a butting plate is attached to a pair of nuts and accommodated in a cover so that the butting plates abut each other. The nut is made to penetrate through the mounting hole of the abutment plate, and the abutment plate is formed by a flange formed on the outer peripheral edge of one end in the axial direction of the nut and a cladding formed by caulking the vicinity of the other end. A method for manufacturing a self-aligning nut, characterized by being integrally held. 2. A method for manufacturing a self-aligning nut in which abutment plates are attached to a pair of nuts, respectively, and the abutment plates are housed in a cover so that the abutment plates abut with each other. It is opened, and a flange is formed on the peripheral edge of the mounting hole. On the other hand, a serration is formed on the outer peripheral surface of the nut, and the serration is pressed into the flange, and the butting plate and the nut are integrally formed. A method of manufacturing a self-aligning nut, characterized by being combined. 3. A method of manufacturing a self-aligning nut in which a collision plate is attached to each of a pair of nuts and accommodated in a cover so that the collision plates abut each other. A method for manufacturing a self-aligning nut, wherein the nut is fitted into a mounting hole of the abutment plate and is integrally fixed to the abutment plate by welding.