JPH10205512A - Metallic plate with bolt and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength and positional precision of a bolt by providing a serration to the bolt under-head part, inserting a metallic part formed by pressing the periphery of a prepared hole of a metallic plate into the serration, and fixing a bolt. SOLUTION: A metallic plate 1 is provided with a prepared hole 3, a bolt 2 is provided with a under head part 6 between a large-diameter head part 4 and a shaft part 5, a serration 7 is formed on it, and the outside diameters of the under head part 6 and the serration 7 are formed into the diameter a little smaller than the inside diameter of the prepared hole 3. When the bolt 2 is inserted into the prepared hole 3 and then the periphery of the prepared hole 3 is pressed by a caulking device 8, the metallic part is inserted into a groove of the serration 7 by plastic deformation, and the bolt 2 can be firmly fixed to the metallic plate 1. Therefore, heat is not applied to the metallic plate 1 and the bolt at all differently from a case of welding, the welding brittleness of high-strength bolt strength caused by heat is not generated, damage of the serration 7 is not also generated, and positional precision of attachment is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolted metal plate used for automobile parts and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art For example, when manufacturing a metal plate with bolts as shown in FIG.
Punch a metal plate 22 with a pilot hole 21 as shown on the left side of
A method has been adopted in which a welding bolt 23 is inserted into the prepared hole 21 from below and a bolt head 24 is welded to the back of the metal plate 22.

However, this prior art has the following problems. Heat is applied to the welding bolt 23 and the metal plate 22 during welding,
High strength bolts cannot be welded due to welding embrittlement. A pressing step and a welding step are required, which increases the manufacturing cost. Since the pilot hole 21 is larger than the diameter of the welding bolt 23, the positional accuracy of the bolt is low. When the bolt and the metal plate 22 are different metals, welding cannot be performed.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, can provide a sufficiently large strength, can reduce the cost of the manufacturing process, and has a high bolt position accuracy. The present invention has been made to provide a bolted metal plate and a method for manufacturing the same, which can be manufactured without any problem even if the metal plate and the metal plate are different metals.

[0005]

According to the present invention, there is provided a bolted metal plate including a metal plate and a bolt inserted into a pilot hole of the metal plate. It is characterized in that a serration is provided at a lower portion, and a metal portion generated by pressing around a prepared hole of a metal plate enters the serration of the bolt and fixes the bolt. Further, the method for manufacturing a metal plate with bolts of the present invention is characterized in that a bolt having serrations at the lower part of a neck is supplied to a press die, inserted into a prepared hole of the metal plate in the press die, and pressed around the prepared hole. The method is characterized in that bolts are attached to the motor. Further, in another method for manufacturing a metal plate with bolts according to the present invention, a bolt having serrations at the lower part of the neck is supplied to a press-type caulking device, and the bolt is inserted into a prepared hole of the metal plate in the press mold by the caulking device. The method is characterized in that the bolts are attached to the metal plate by pressing around the hole and crushing the serrations and pressing the serrations against the metal plate.
In this case, the serration can be formed in a non-circular shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a metal plate with bolts of the present invention, 1 is a metal plate such as a steel plate, and 2 is a bolt fixed to both ends of the metal plate 1. As shown in FIG. 2, the metal plate 1 has a prepared hole 3. The bolt 2 has a lower neck 6 between the large-diameter head 4 and the shaft 5.
In which serrations 7 are formed. The outer diameter of the neck lower part 6 and the serration 7 is slightly smaller than the inner diameter of the pilot hole 3.

As shown in FIG. 2, when the bolt 2 is inserted into the prepared hole 3 of the metal plate 1 and the periphery of the prepared hole 3 is pressed by the caulking device 8, the portion around the prepared hole 3 of the metal plate 1 becomes plastic. The portion of the metal generated by the deformation enters the groove of the serration 7 of the bolt 2 and firmly fixes the bolt 2 to the metal plate 1 as shown in the lower part of FIG.

When the metal plate 1 is a thin plate and the fixing method as shown in FIG. 2 cannot be adopted, the peripheral portion of the prepared hole 3 of the metal plate 1 is burred as shown in FIG. Then, the metal part is inserted into the groove of the serration 7 of the bolt 2 by pressing as described above, and the bolt 2 may be fixed to the metal plate 1. Such a burring process can compensate for the insufficient thickness of the metal plate 1.

Further, as shown in FIG. 5, when the periphery of the prepared hole 3 of the metal plate 1 is pressed and the serrations 7 are crushed and pressure-bonded to the metal plate 1, the fixation becomes stronger. Further, the serrations 7 may have a non-circular shape as shown in FIG.

As described above, the mounting of the bolt 2 to the metal plate 1 by the method of the present invention does not require welding, and can be performed only by pressing. FIG. 4 is a view showing a device for manufacturing the metal plate with bolts, 8 is a caulking device provided on the upper die of the press, 9 is a parts feeder, and 10 is a chute. The bolt 2 having the serration 7 at the lower part 6 of the neck is automatically supplied from the parts feeder 9 to the caulking device 8 via the chute 10, and then, with the operation of the press, the metal plate 1 set on the lower die is formed. It is automatically inserted into the prepared hole 3 via the caulking device 8. Then, the lower die
The bolt 11 is attached to the metal plate 1 by pressing around the prepared hole 3.

As described above, according to the present invention, the metal plate 1
Since the bolt 2 can be attached only by pressing around the prepared hole 3, unlike the conventional welding, no heat is applied to the metal plate 1 and the bolt 2. Therefore, there is no welding brittleness of high strength bolt strength due to heat as in the prior art. Moreover, since the metal part formed by the plastic working is inserted into the groove of the serration 7 of the bolt 2 and attached, the serration 7 is not damaged.

Further, according to the present invention, since a metal plate with bolts can be manufactured only by pressing, the manufacturing cost can be reduced as compared with the conventional method which requires two steps of a pressing step and a welding step. It becomes possible. In addition, according to the present invention, since the bolt 2 is swaged by the caulking device 8, the positional accuracy of the mounting of the bolt 2 is increased, and when the bolt 2 is made of steel and the metal plate 1 is made of aluminum, welding is impossible. Also, the bolt 2 can be attached.

[0013]

As described above, according to the bolted metal plate and the method of manufacturing the same of the present invention, a bolted metal plate having high strength and high bolt position accuracy can be obtained. In addition, since a metal plate with bolts can be manufactured only by pressing, the cost of the manufacturing process can be reduced, and there is an advantage that the bolt and the metal plate can be manufactured without any trouble even when welding is impossible due to dissimilar metals. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bolted metal plate of the present invention.

FIG. 2 is a manufacturing process diagram of the bolted metal plate of the present invention.

FIG. 3 is another manufacturing process diagram of the bolted metal plate of the present invention.

FIG. 4 is a side view of the apparatus for manufacturing a bolted metal plate of the present invention.

FIG. 5 is another manufacturing process diagram of the bolted metal plate of the present invention.

FIG. 6 is another manufacturing process drawing of the bolted metal plate of the present invention.

FIG. 7 is a manufacturing process diagram of a conventional bolted metal plate.

[Explanation of symbols]

 Reference Signs List 1 metal plate 2 bolt 3 pilot hole 4 head 5 shaft 6 lower neck 7 serration 8 caulking device 9 parts feeder 10 chute 21 pilot hole 22 metal plate 23 welding bolt 24 bolt head

Claims (4)

[Claims] 1. A metal plate and a bolt inserted into a prepared hole of the metal plate, the bolt having a serration at a lower part of a neck, and a metal formed by pressing around the prepared hole of the metal plate. A metal plate with bolts, characterized in that the part enters the serrations of the bolt and fixes the bolt. 2. A metal plate, wherein a bolt having serrations at the lower part of the neck is supplied to a press-type caulking device, inserted into a prepared hole of the metal plate in the press die by the caulking device, and pressed around the prepared hole. A method for manufacturing a metal plate with bolts, comprising attaching bolts to a metal plate. 3. A bolt having a serration at the lower part of the neck is supplied to a press-type caulking device, and inserted into a lower hole of a metal plate in the press die by the caulking device. The periphery of the lower hole is pressed and the serration is crushed. And mounting the bolt on the metal plate by pressure bonding the metal plate to the metal plate. 4. The method according to claim 3, wherein the serration has a non-circular shape.