JPH0465252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a flanged bolt that is effectively used for fixing plate materials such as ALC plates.

<Conventional technology> As a conventional flanged bolt, for example,
The techniques shown in Japanese Patent No. 152604, Japanese Patent No. 62-11904, etc. are known. Conventional flanged bolts of this type generally have a flanged bolt fixed to a threaded rod at a predetermined position by welding.

<Problems to be Solved by the Invention> However, as mentioned above, in conventional flanged bolts of this type, the flanges were fixed to the bolt shaft by welding, so spatters could adhere to the threaded portion and interfere with the function of the screw. There is a risk that the plating liquid may impede or stain the weld bead, and there is a problem of plating defects occurring due to penetration of the plating liquid into weld bead pinholes, overlap areas, etc.
Furthermore, it is difficult to accurately fix the flange to the screw shaft, causing tilting and deformation.Furthermore, each piece must be manually welded, resulting in poor workability and a high incidence of defective products. The dot was hot.

The method for manufacturing a flanged bolt according to the present invention relates to a completely new technology developed in view of these conventional problems.

<Means for Solving the Problems> A method for manufacturing a flanged bolt according to the present invention includes forming a flanged bolt having a small hole having an inner diameter smaller than the shaft diameter of the bolt into a bowl shape; Insert the bolt shaft into the small hole in the formed tsuba, and then return the tsuba to its original flat shape by pressing using a press die that has protrusions that can press particularly strongly the peripheral edge of the small hole in the tsuba. In particular, the present invention relates to a method of manufacturing the bolt, characterized in that the flange is strongly crimped onto the bolt shaft to integrally fix it, and then a thread is formed on the bolt shaft.

<Function> As described above, in the method for manufacturing a flanged bolt according to the present invention, the bolt shaft is inserted into the small hole drilled in the flanges with the flanges curved into a bowl shape. The bolt shaft can be inserted into a small hole with a smaller inner diameter. In addition, after inserting the bolt shaft into the small hole, the flange is returned to its original flat shape by pressing using a press mold having a protrusion that can press particularly strongly the peripheral edge of the small hole of the tsuba. In particular, the inner peripheral edge of the small hole in the collar can be bitten into the outer peripheral surface of the bolt shaft to firmly fix it. Furthermore, since it is possible to manufacture flanged bolts by press work, it is possible to mass produce them by assembly line work, and it is also possible to construct products with a certain level of quality, precision, and beautiful appearance.

<Example> One example of the method for manufacturing a flanged bolt according to the present invention will be specifically described with reference to figures.
In the figure, 1 is a flanged bolt manufactured by the manufacturing method according to the present invention, which is formed by fixing a flanged bolt 4 in close contact with the convex ring 2 of a threaded rod 3 having a convex ring 2 in the middle. It is structured as follows.

Next, in FIGS. 2 to 5, 3a is the bolt shaft before the thread is formed, and the collar 4 has a small hole 5 with an inner diameter slightly smaller than the shaft diameter of the bolt shaft 3. It is perforated. When attaching the collar 4 to the bolt shaft 3a, first curve the collar 4 into a bowl shape.
As a result, the inner diameter of the small hole 5 of the collar 4 is increased, and in this state, the bolt shaft 3a is inserted into the small hole 5 of the collar 4.
Then, the bolt shaft 3a is attached to a press female mold 6a of a press device (not shown), and the collar 4 is returned to its original flat shape by pressing the collar 4 with a press male mold 6b, and the convex ring 2 is formed. The inner peripheral edge of the small hole 5 of the collar 4 is bitten into the outer peripheral surface of the bolt shaft 3a to fix them to each other, and the collar 4 can be attached to the bolt shaft 3a.

In the method for manufacturing a flanged bolt according to the present invention, in particular, as shown in FIG. Male type 6b is used. Therefore, when the flange 4 is pressed with the male press die 6b, the peripheral edge of the small hole 5 of the flange 4 is particularly strongly pressed with this protrusion 7, and a curved concave ring 8 as shown in FIG. 5 is formed in this area. As a result, the collar 4 can be firmly fixed to the bolt shaft 3a, and the fixed portion can be beautifully shaped.

Further, in the manufacturing method according to the present invention, after the flange 4 is fixed to the bolt shaft 3a with a press as described above, the screw 3b is formed on the bolt shaft 3a using a rolling method, and the screw 3b is formed as shown in FIG. By configuring the rod 3, the bolt 1 with the collar 4 can be completed.

In the above embodiment, according to many years of experiments by the present inventors, when the flange 4 is curved into a bowl shape, the bolt can be inserted into the small hole 5 of the flange 4, which is 0.2 to 0.3 mm smaller than the diameter of the bolt shaft 3a. It has been found that it is possible to insert the shaft 3a. Therefore, in a specific embodiment of the present invention, a bolt shaft 3 having a shaft diameter of 10.7 mm is inserted into the small hole 5 of the collar 4 having a small hole 5 with an inner diameter of 10.4 to 10.5 mm.
I was able to insert a smoothly. Furthermore, as a result of forming a thread 3b on this bolt shaft 3a by a rolling method, the outer diameter of the threaded rod 3 was increased to 12 mm.

In the embodiment of the present invention, as shown in FIGS. 6 and 7, a recess 9a or a ring groove 9b may be previously formed in the bolt shaft 3a, and the collar 4 may be attached more strongly to this portion. It is possible.

The bolt shaft 3a in the above embodiment is not limited to a cylinder, but can be a hexagonal pillar, an octagonal pillar, or an oval-shaped pillar, and the collar 4 can also be freely used as a circular plate, square plate, elliptical plate, triangular plate, etc. You can.

<Effects of the Invention> As described above, in the method for manufacturing a flanged bolt according to the present invention, the bolt shaft is inserted into the small hole of the collar with the collar deformed into a bowl shape. The bolt shaft can be inserted smoothly into a small hole with a smaller inner diameter, and the flange is then pressed using a press die with protrusions that can press particularly strongly the peripheral edge of the small hole in the flange. Since the inner circumferential edge of the small hole can be deeply bitten into the outer circumferential surface of the bolt shaft, the two can be firmly fixed to each other. Furthermore, since the method according to the present invention does not require welding work, there is no fear of spatter adhering to screws, etc., and mass production can be carried out by assembly line work. Therefore, it is possible to mass produce products with good quality and beautiful appearance at low cost. It has characteristics such as being able to

[Brief explanation of the drawing]

FIG. 1 is a side view of a bolt manufactured by the method for manufacturing a flanged bolt according to the present invention, FIGS. 2 to 5 are cross-sectional explanatory views showing the method for manufacturing this flanged bolt, and FIGS. The figure is an explanatory diagram of another example. 1 is a flanged bolt, 2 is a convex ring, 3 is a threaded rod,
3a is the bolt shaft, 4 is the collar, 5 is the small hole, 6a, 6b
7 is a press mold, 7 is a protrusion, and 8 is a concave ring.

Claims (1)

[Claims] 1. A flange having a small hole with an inner diameter smaller than the shaft diameter of the bolt is curved into a bowl shape, the bolt shaft is inserted into the small hole of the flange curved into a bowl shape, and the bolt shaft is inserted into the small hole of the flange. Using a press mold having a protrusion that can press the peripheral edge particularly strongly, the collar is returned to its original flat shape by pressing, and the collar is strongly pressed onto the bolt shaft and fixed integrally. A method for producing a flanged bolt, comprising: then forming a thread on the bolt shaft.