JPH07269537A - Calking boss - Google Patents

Abstract

PURPOSE:To provide a calking boss which can be fixed solidly to a metal plate. CONSTITUTION:In a calking boss which has a head 52 whose diameter is larger than that of the hole 61 of a metal plate 60; and an insertion part 53 erected at the head 52 and having the diameter to insert to the hole 61, in which a groove 56 is formed at the border with the head 52; and furthermore, the head 52 is pressed in to the metal plate 60 in the condition the insertion part 53 has been inserted to the hole 61 of the metal plate 60, the cross section form of the groove 56 is made in a triangular form making the surface 52a of the head 52 at the side the insertion part 53 is erected, as the base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking boss attached to a metal plate by press fitting.

[0002]

2. Description of the Related Art A conventional caulking boss 10 is shown in FIGS.
As shown in FIG. 2, the head portion 11 having a diameter slightly larger than the hole portion 21 formed in the metal plate 20 and the hole portion 2 provided upright on the head portion 11 are provided.
1 is integrally formed with a metal material and has an insertion portion 12 having a diameter that can be fitted in the outer peripheral surface of the insertion portion 12. 13 is formed. Further, a knurl 11a for preventing rotation is formed on the outer peripheral surface of the head portion 11, and a screw hole 14 penetrating from the head portion 11 to the insertion portion 12 is formed.

To attach the caulking boss 10 to the metal plate 20, as shown in FIG. 7A, the metal plate 20 is placed on the lower mold 30 and inserted into the hole 21 of the metal plate 20. Part 12
Is inserted, and the punch 11 presses the head 11 into the metal plate 20 so that the head 11 is flat against the surface 20a of the metal plate 20. As a result, as shown in FIG. 7B, the part 22 of the metal plate 20 that receives the pressure of the head 11 enters the groove 13 and the caulking boss 10 is fixed to the metal plate 20.

However, this conventional caulking boss 10
Then, it is difficult to allow the part 22 of the metal plate to enter the deep part of the groove part 13 only by the pressure of the head part 11 on the metal plate 20, and between the bottom surface 13a side of the groove part 13 and the part 22 of the metal plate. There was a gap S in the. Therefore, the contact area between the wall surface of the groove portion 13 and the part 22 of the metal plate is reduced, so that the coupling force between the caulking boss 10 and the metal plate 20 is weakened, and for example, an electric screwdriver when screwing a screw into the screw hole 14. There is a problem that the caulking boss 10 is loosened in the connection with the metal plate 20 due to the vibration of FIG.

[0005]

As described above, in the caulking boss, the caulking is small because the contact area between a part of the metal plate that enters the groove under the pressure of the head of the caulking boss and the groove wall surface is small. There is a problem that the boss cannot be firmly fixed to the metal plate.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to provide a caulking boss that can be firmly fixed to a metal plate.

[0007]

According to a first aspect of the present invention, a head having a diameter larger than that of a hole formed in a metal plate and a diameter which is erected on the head and can be fitted into the hole are provided. The outer peripheral surface is integrally formed with a metal material and an insertion portion in which a groove portion is formed at the boundary portion with the head portion in a state in which the insertion portion is inserted into the hole portion of the metal plate. In the caulking boss in which the head portion is press-fitted into the metal plate, the cross-sectional shape of the groove portion has a triangular shape having a bottom surface of the head portion on the side where the insertion portion is erected. Has become.

According to a second aspect of the present invention, a head having a diameter larger than that of a hole formed in a metal plate and a diameter which is erected on the head and can be fitted into the hole are formed on the outer peripheral surface of the head. An insertion part having a first groove formed over the entire circumference at a boundary portion with the metal part is integrally formed of a metal material, and the head part is in a state where the insertion part is inserted into a hole of the metal plate. In the crimping boss that is press-fitted into the metal plate, a protrusion is formed concentrically with the insertion portion on the tip end surface of the insertion portion, and the tip end surface has a peripheral surface of the protrusion portion as a base. The second groove portion having a triangular cross section is formed.

According to a third aspect of the present invention, a head having a diameter larger than that of a hole formed in a metal plate, and a diameter which is erected on the head and fits into the hole, and the outer surface has the head. An insertion part having a first groove formed over the entire circumference at a boundary portion with the metal part is integrally formed of a metal material, and the head part is in a state where the insertion part is inserted into a hole of the metal plate. In the caulking boss that is press-fitted into the metal plate, the cross-sectional shape of the groove has a triangular shape with the bottom surface being the surface of the head on the side where the insertion portion is erected, and at the tip surface of the insertion portion. Is a state in which a protrusion is formed concentrically with the insertion portion, and a second groove portion having a triangular cross-section whose base is the peripheral surface of the protrusion surrounds the protrusion on the distal end surface. It has a formed structure.

[0010]

In the caulking boss according to the first aspect of the present invention, the groove formed in the insertion portion has a triangular cross section whose base is the standing surface of the insertion portion of the head. Part of the metal plate that enters the groove goes from the widest groove entrance to the inner part of the groove where the area is gradually narrowed, so part of the metal plate contacts the wall surface of the groove in a wide range,
Further, there is almost no gap between a part of the metal plate and the wall surface of the groove.

In the caulking boss according to the second aspect of the present invention, a protrusion is formed on the tip surface of the insertion portion concentrically with the insertion portion, and the tip surface has a triangular shape with the peripheral surface of the protrusion as the base. Since the second groove portion having a cross section of is formed, the insertion portion is inserted into the hole portion of the metal plate having a plate thickness approximately equal to the length of the insertion portion, and the tip end surface of the metal plate and the insertion portion is made into the lower mold. When the head is pressed in the state of being received by, the part of the metal plate subjected to the pressure of the head enters the first groove portion and the peripheral edge portion of the tip end surface where the second groove portion is formed has the lower die pressure. Then, the head is swollen to the outside and the head is caulked to the metal plate on the surface opposite to the surface of the metal plate into which the head is press fitted.

In the caulking boss according to the third aspect of the invention, the first groove portion formed in the insertion portion has a cross-sectional shape of a triangle having the insertion portion standing surface of the head as a base and the tip end surface of the insertion portion. Since a projection is formed concentrically with this insertion part, and a second groove part having a triangular cross section whose base is the peripheral surface of this projection is formed on the tip surface, When the insertion part was inserted into the hole of the metal plate with a plate thickness approximately the same as the length and the head was pressed with the tip of the metal plate and the insertion part being received by the lower mold, the head pressure was received. A part of the metal plate surely enters the first groove portion having a triangular cross section, and
The peripheral portion of the front end surface where the groove portion is formed spreads, and the head portion is caulked to the metal plate on the surface opposite to the surface into which the head portion is press-fitted.

[0013]

Embodiments of the present invention will now be described in detail with reference to FIGS.

1 to 3 are views showing a first embodiment, FIG. 1 is a partially cut front view showing a caulking boss, FIG. 2 is a perspective view of a caulking boss, and FIG. 3 is a caulking boss mounting process. FIG.

The caulking boss 50 according to this embodiment is made of a metal such as stainless steel or iron (SUM), and has a hole 61 formed in a metal plate 60 such as aluminum or iron (SPCC).
It is attached by press fitting.

As shown in FIGS. 1 and 2, the caulking boss 50 has a cylindrical shape having a screw hole 51,
The head portion 52, the insertion portion 53 erected on the surface (standing surface) 52a of the head portion 52, and the protrusion portion 54 erected on the tip end surface 53a of the insertion portion 53 are concentric about the screw hole 51. Is formed in. Further, a knurl 52b for preventing rotation is formed on the outer peripheral surface of the head portion 52, and a groove portion (first groove portion) 56 is formed on the outer peripheral surface of the insertion portion 53 at the boundary portion with the head portion 52 over the entire circumference. Has been formed. The cross-sectional shape of the groove 56 has a triangular shape with the head standing surface 52a as the base. In addition, the protruding portion 54 is also formed on the distal end surface 53a of the insertion portion.
A groove portion (second groove portion) 57 is formed so as to surround the. The cross-sectional shape of the groove 57 is triangular with the protrusion 54 as the base.

The caulking boss 50 has a plate thickness T of 1.
The diameter of the head portion 52 is 7.0 mm and the diameter D2 of the insertion portion 53 is 6 mm. .15 mm,
The diameter D3 of the protruding portion 54 is 5.2 mm, the thickness T1 of the head portion 52 is 0.5 mm, the height T2 of the insertion portion 53 is 1.2 mm, and the groove portion 56.
The width T3 of the opening side of the groove is 0.5 mm, the depth T4 of the groove portion 57 is 0.25 mm, and the standing surface 52a forming the inner wall surface of the groove portion 56.
The angle θ1 formed by the other surface with the other surface is 45 °, and the angle θ2 formed by the peripheral surface of the protrusion 54 forming the inner wall surface of the groove 57 with the other surface is 6 °.
It is 0 °.

To attach the caulking boss 50 to the metal plate 60, as shown in FIG. 3A, the metal plate 60 is placed on the lower mold 70 and the insertion portion 53 is inserted into the hole 61 of the metal plate 60. It is performed by pressing the head 52 into the metal plate 60 with the punch 80 so that the head 52 is flat against the one surface 60a of the metal plate 60 in the inserted state. With this,
As shown in (b), the metal plate 6 that receives the pressure of the head 52
A part 62 of 0 goes into the groove 56. In this case, the cross-sectional shape of the groove 56 is a triangle with the standing surface 52a of the head 52 as the bottom side. Therefore, the part 62 of the metal plate that enters the groove portion 56 goes from the entrance of the groove part having the largest area to the inner part of the groove part where the area gradually becomes smaller. It can enter without any contact, and the contact area between the part 62 of the metal plate and the wall surface of the groove 56 becomes large. Further, the peripheral edge portion of the insertion portion front end surface 53a spreads outward under the pressure of the lower mold 70, and the peripheral edge portion 53b is caulked on the other surface 60b side of the metal plate 60.
Therefore, the caulking boss 50 is firmly connected to the metal plate 60. Although the caulking boss 50 is formed with the screw hole 51 in this example, the hole may be a ridiculous hole.

FIG. 4 is a diagram showing a second embodiment of the present invention. The insertion portion 53A of the caulking boss 50A of this example is longer than the insertion portion 53 of the caulking boss 50 according to the first embodiment, and the tip surface 531 is not provided with a protrusion. It should be noted that the outer peripheral surface of the insertion portion 53A and the boundary portion with the head portion 52 are provided with a groove portion 56 having a triangular cross section, which is the same as in the first embodiment.

To attach the caulking boss 50A to the metal plate 60, as shown in FIG. 4A, the metal plate 60 is placed on the lower mold 70 and the insertion portion 53A is inserted into the hole 61 of the metal plate 60. The head 52 with the punch 80 and the metal plate 60.
It is done by press fitting into. As shown in FIG. 4B, this is the same as the first embodiment in that the part 62 of the metal plate 60 that receives the pressure of the head portion 52 enters the groove portion 56 without a gap.

In the caulking boss 50A of this example, the metal plate 60
Since the other surface 60b side cannot be caulked, the bonding strength with the metal plate 60 is lower than in the first embodiment, but the contact area between the part 62 of the metal plate and the wall surface of the groove 56 is large. Therefore, as compared with the conventional caulking boss 10, the bonding strength with the metal plate is large. Further, it is characterized in that the thickness of the metal plate 60 is not restricted by the height of the insertion portion 53A.

FIG. 5 is a diagram showing a third embodiment of the present invention. The caulking boss 50B of this example is the same as that of the first embodiment except that the groove 56B formed on the peripheral surface of the insertion portion 53 and at the boundary with the head portion 52 has a rectangular cross section. It is composed. In this example, since the groove 56B has a quadrangular cross section, it is difficult for the part 62 of the metal plate to enter the groove 56B. Therefore, the bonding strength with the metal plate 60 is inferior to that of the groove 56 having a triangular cross section. Since the other surface 60b of the plate 60 can also be caulked to the metal plate 60, the bonding strength with the metal plate is significantly larger than that of the conventional caulking boss 10. When the caulking boss 50B of the present example is compared with the caulking boss 50 of the first embodiment, the first groove portion 56B
Since the gap between the inner part of the second groove 57 and the inner part of the second groove 57 becomes narrower, when the pressure of the lower mold 70 acts on the insertion end surface 53a, the groove 5
There is a drawback that shearing is likely to occur in the portion 53d between the 6B and the groove portion 57.

[0023]

As described above, in the caulking boss according to the first aspect of the present invention, the groove formed around the insertion portion has a triangular cross section, so that the metal that enters into the groove under the pressure of the head is inserted. The contact area between a part of the plate and the wall surface of the groove becomes large, and the caulking boss is firmly bonded to the metal plate.

In the caulking boss according to the second invention, the first groove portion formed around the insertion portion and the second groove formed on the distal end surface of the insertion portion.
Since the two portions of the groove portion are crimped to the metal plate, the crimping boss is firmly bonded to the metal plate.

In the caulking boss according to the third aspect of the invention, the caulking boss is caulked on the metal plate at two locations, that is, the first groove portion having a triangular cross section formed around the insertion portion and the second groove portion formed on the distal end surface of the insertion portion. The caulking boss is more firmly bonded to the metal plate than the first and second inventions.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a caulking boss according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the caulking boss of FIG.

FIG. 3 is a diagram showing a mounting operation of the caulking boss of FIG.

FIG. 4 is a diagram showing a caulking boss according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a caulking boss according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a conventional caulking boss.

FIG. 7 is a diagram showing a conventional caulking boss mounting operation.

[Explanation of symbols]

 50 Caulking boss 52 Head 52a Standing surface 53 Insertion portion 53a Tip surface 54 Projection portion 56 First groove portion 57 Second groove portion 60 Metal plate 61 Hole portion

Claims (3)

[Claims] 1. A head having a diameter larger than that of a hole formed in a metal plate, and a diameter which is erected on the head and can be fitted into the hole and has a boundary with the head on the outer peripheral surface. An insertion part having a groove formed in the entire circumference is integrally formed of a metal material, and the head is press-fitted into the metal plate in a state where the insertion part is inserted into the hole of the metal plate. In the caulking boss, the cross-sectional shape of the groove portion has a triangular shape having a bottom surface of a surface of the head on a side where the insertion portion is erected, the caulking boss. 2. A head portion having a diameter larger than that of a hole formed in a metal plate, and a diameter which is set upright in the head portion and can be fitted into the hole portion, and a boundary with the head portion is provided on an outer peripheral surface. An insert part having a first groove formed in the entire circumference is integrally formed of a metal material, and the head part is the metal plate in a state where the insert part is inserted into the hole of the metal plate. In the caulking boss that is press-fitted to, a protrusion is formed concentrically with the insertion portion on the tip end surface of the insertion portion, and the tip end surface has a triangular shape with the peripheral surface of the protrusion portion as the base. A caulking boss characterized in that a second groove portion having a cross section is formed so as to surround the protrusion. 3. A head having a diameter larger than that of a hole formed in a metal plate, and a diameter which is erected on the head and fits into the hole, and has a boundary with the head on the outer peripheral surface. An insert part having a first groove formed in the entire circumference is integrally formed of a metal material, and the head part is the metal plate in a state where the insert part is inserted into the hole of the metal plate. In the caulking boss that is press-fitted into, the cross-sectional shape of the groove portion has a triangular shape having a bottom surface of the surface of the head on the side where the insertion portion is erected, and the insertion portion is provided at the tip end surface of the insertion portion. A protrusion is formed concentrically with the second end, and a second groove portion having a triangular cross-section whose base is the peripheral surface of the protrusion is formed on the tip surface so as to surround the protrusion. A caulking boss characterized by that.