JPH06185515A - Method for fixing bolt to plate material and structure of this bolt - Google Patents

Abstract

PURPOSE:To provide a method for fixing a bolt to a plate material and a structure of this bolt wherein sufficient rotation resisting force and extraction resisting force can be ensured without increasing a number of parts. CONSTITUTION:An irregularity part 12 for biting into a plate material is provided in a neck part 11 of this bolt, and further a neck part diameter spreading hole 14 is provided from a bolt head top part 13 over to the neck part 11 in an axial center part, positioned and fitted into a mounting hole 21 of the plate material. Next, a tool of diameter larger than the diameter of the diameter spreading hole 14 is pressed thereinto, to spread a diameter of the bolt neck part, and the bolt is press fixed to a peripheral edge part of the mounting hole 21 of the plate material 2. Or a screw part for biting in the plate material is provided in the bolt neck part 11, to form a diameter of the bolt mounting hole of the plate material a little smaller than the diameter of the bolt deck part, and after press fitting the bolt neck part into the mounting hole of the plate material, the bolt head part and the bolt neck part in an opposite side to the head part are calked to pressure connect a calked part to the plate material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of fixing a bolt to a plate material.

[0002]

2. Description of the Related Art When fixing a bolt to a plate member, generally, the bolt neck is positioned in a mounting hole of the plate member and fitted therein, and then integrated by welding or the like. However, when a high-strength bolt is fixed to a plate material, especially a thin plate, welding is not reliable because the mixture ratio of carbon and the like is high.
The method shown in is adopted. That is, according to the method of FIG. 6, the prism portion b is formed in the neck portion of the bolt a, and the prism portion b is formed.
Position in the mounting hole of the plate c and crimp from the other side,
The plate member c was held by the caulked portion d. Also,
FIG. 7 shows a method of engraving a selection e on the neck portion of the bolt a and press-fitting this into the mounting holes of the plate material c and the reinforcing plate f and caulking.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. When the prismatic portion b shown in FIG. 6 is formed, sufficient rotational resistance can be secured, but the plate material c
Adhesion strength to is weak and securing of pulling resistance is insufficient. On the other hand, when the selection e shown in FIG. 7 is provided, the rotational force resistance is insufficiently secured as compared with the case where the prismatic portion b is provided. In addition, when it is attached to a thin plate, it is uneconomical because the reinforcing plate f is necessary because the pulling resistance cannot be sufficiently secured and the number of parts increases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and secures sufficient rotation resistance and pullout resistance without increasing the number of parts. It is an object of the present invention to provide a method of fixing a bolt to a plate material and a structure of the bolt, which can be achieved. That is, the present invention is a method of fixing a neck portion of a bolt to a plate material having a bolt mounting hole, in which an uneven portion for biting into the plate material is provided in the bolt neck portion, and a neck portion extends from the bolt head top portion to the neck portion in the axial center portion. Expand the bolt neck diameter by inserting a bolt with a hole for expanding the diameter of the bolt with the neck positioned inside the mounting hole of the plate material and then pushing a tool with a diameter larger than the diameter of the hole into the hole for expanding the diameter. Then, the plate material and the bolt are integrally fixed by pressure-bonding to the peripheral edge of the mounting hole of the plate material, and the structure of the bolt. In addition, in the method of fixing the bolt neck to the plate material in which the bolt mounting hole is opened, a screw part for biting into the plate material is provided in the bolt neck part, and the diameter of the bolt mounting hole of the plate material is slightly larger than the diameter of the bolt neck part. Formed small, after press-fitting the bolt neck into the mounting hole of the plate, crimp the bolt neck on the side opposite to the head of the bolt, crimp the crimped part to the plate, and fix the plate and the bolt integrally It is a method and the structure of the bolt. Further, the structure of the bolt is characterized in that a groove is provided in an axial direction in the threaded portion provided on the bolt neck portion.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. <A> Bolt Structure (FIGS. 1 and 2) The bolt 1 of the present invention includes a head portion, a neck portion, and a screw portion. The neck portion 11 is provided with an uneven portion 12 for biting into the plate material. The uneven portion 12 is formed, for example, by engraving a linear groove group in the vertical direction, the horizontal direction, the diagonal direction, or a composite direction thereof. Further, a thread groove may be engraved. Figure 1
The case where the linear groove groups are diagonally intersected is shown. In addition, a diameter-expanding hole 14 of the neck 11 is provided at the axial center of the bolt from the bolt head top 13 to the neck 11 by cold working or the like. The diameter of the diameter expanding hole 14 is determined in relation to the wall thickness of the neck portion 11. That is, if the thickness of the neck portion 11 is too thin, the strength of the bolt decreases, and if it is too thick, it becomes difficult to expand the diameter. Therefore, the diameter of the diameter expanding hole 14 is appropriately determined in consideration of these conditions.

<B> Crimping method (FIGS. 1 and 3) First, as shown in FIG. 1, the neck portion 11 is positioned in the mounting hole 21 of the plate member 2 and the bolt 1 is inserted. Next, as shown in FIG. 3, the punch-shaped tool 3 whose tip has an enlarged diameter is press-fitted into the diameter-expansion hole 14. The tip of this tool 3 has a diameter larger than the diameter of the diameter-expanding hole 14, and penetrates the air vent hole 31 in the axial direction. When the tool 3 is press-fitted, the neck 11
Is expanded, and the peripheral surface of the neck portion 11 is integrally crimped to the peripheral edge portion of the mounting hole 21. Therefore, it is possible to obtain sufficient rotation resistance and pullout resistance of the bolt 1. In addition, since the uneven portion 12 bites into the peripheral portion of the mounting hole 21 when crimped,
The crimping force between the bolt 1 and the plate material 2 can be further increased. After crimping, the tool 3 is removed and the work is completed.

[0007]

Other Embodiment 1 Depending on the size or material of the bolt, the strength of the bolt neck portion 11 may decrease when the diameter of the bolt neck portion 11 is expanded. In such a case, the neck 11 may be formed to have a diameter larger than the screw diameter to ensure a predetermined strength.

[0008]

Other Embodiment 2 In each of the above embodiments, a hole for expanding the diameter is provided from the head portion to the neck portion of the bolt, but it is conceivable that such a hole is not provided. That is, FIGS.
As shown in FIG. 3, the bolt neck portion 11 is provided with a screw portion 17 and a stepped portion 18 for biting into the plate material 2, and the diameter of the bolt mounting hole 21 of the plate material 2 is formed to be slightly smaller than the diameter of the bolt neck portion 11. Then, the bolt neck 11 is attached to the mounting hole 21 of the plate member 2.
After press-fitting into the inside, the stepped portion 18 is crimped by the die 4 to crimp the crimped portion 19 to the plate member 2. As a result, the screw portion 17 bites into the inner peripheral surface of the mounting hole 21 of the plate member 2, and the plate member 2 and the bolt 1 can be integrally fixed. As for the rotational resistance of the bolt 1, the screw bites into the inner peripheral surface of the mounting hole 21. Therefore, if the screw portion 17 is left-handed, the nut can be fastened. In addition, since the pulling resistance is a screw, it is improved by several steps as compared with selection. Furthermore, the threaded portion 17
It may be possible to provide a plurality of grooves in the axial direction. The reason why the groove is provided in this manner is to increase the anti-rotational force by making it penetrate into the plate member 2. In particular, when the nut fastened to the bolt thread portion is loosened, the bolt is likely to rotate together, which has the effect of preventing this.

[0009]

Since the present invention is as described above, the following effects can be obtained. <A> By enlarging the diameter of the neck portion of the bolt, the peripheral surface of the neck portion can be firmly pressed against the peripheral edge portion of the mounting hole of the plate material.
Therefore, it is possible to secure sufficient rotation resistance and pullout resistance without increasing the number of parts.

<B> By providing the uneven portion on the neck portion, when the diameter of the neck portion is increased, the uneven portion bites into the peripheral portion of the plate material mounting hole. Therefore, the pressing force between the bolt and the plate material is increased, and the rotation resistance and the pulling resistance can be further improved.

<C> By providing a screw part for biting into the plate material at the neck portion of the bolt, the screw part bites into the inner peripheral surface of the mounting hole of the plate material, and the plate material and the bolt can be integrally fixed. At this time, with respect to the rotational resistance of the bolt, the screw bites into the inner peripheral surface of the mounting hole. Therefore, if the screw portion is left-handed, the nut can be fastened. In addition, since the pulling resistance is a screw, it is improved by several steps as compared with selection.

<D> By providing a plurality of grooves in the bite screw portion in the axial direction, it is possible to prevent the bolt from rotating together when the nut fastened to the bolt screw portion is loosened.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state where a bolt of the present invention is fitted into a plate material.

FIG. 2 is a plan view of the bolt of the present invention.

FIG. 3 is an explanatory view of a crimping process of the plate material and the bolt of the present invention.

FIG. 4 is an explanatory diagram of another embodiment 2.

FIG. 5 is an explanatory diagram of another embodiment 2.

FIG. 6 is an explanatory diagram of a conventional technique.

FIG. 7 is an explanatory diagram of a conventional technique.

Claims (5)

[Claims] 1. A method of fixing a neck portion of a bolt to a plate material having a bolt mounting hole, wherein a concave and convex portion for biting into the plate material is provided on the bolt neck portion, and the shaft center portion extends from the bolt head top portion to the neck portion. Insert the bolt with the diameter-expanding hole into the mounting hole of the plate material, and then insert a bolt with a diameter larger than the diameter of the hole to expand the bolt neck diameter. This method is characterized in that the plate material and the bolt are integrally fixed by crimping to the periphery of the mounting hole of the plate material. 2. The fixing of the plate member and the bolt according to claim 1, wherein the bolt neck has an uneven portion for biting into the plate member, and the shaft center has a hole for expanding the neck portion from the top of the bolt head to the neck. The structure of the bolt used in the method. 3. A method for fixing a neck portion of a bolt to a plate member having a bolt mounting hole, wherein the bolt neck portion is provided with a screw portion for biting into the plate member, and the diameter of the bolt mounting hole of the plate member is the diameter of the bolt neck portion. After making the bolt neck smaller than that of the bolt and press-fitting the bolt neck into the mounting hole of the plate, crimp the bolt neck on the side opposite to the head of the bolt to crimp the crimp to the plate, and fix the plate and the bolt together. Characterized method. 4. The method of fixing a plate member and a bolt according to claim 3, wherein the bolt neck portion is provided with a screw portion for biting into the plate member, and the diameter of the neck portion is formed slightly larger than the diameter of the bolt mounting hole of the plate member. The structure of the bolt used. 5. The structure of the bolt according to claim 4, wherein the threaded portion provided on the neck portion of the bolt is provided with a groove in the axial direction.