JP7216453B1 - FASTENING STRUCTURE, BOLT MANUFACTURING METHOD, AND BOLT FORMER - Google Patents

Abstract

An object of the present invention is to prevent loosening of a bolt by utilizing the characteristics of a photocurable material. SOLUTION: A cavity S0 for bolt molding including the inner spaces of bolt insertion holes 2a, 3a of members to be fastened 2, 3 and the inner space of a nut 20 is formed, and the cavity S0 is filled with a photocurable material 100. , the photo-curable material 100 filled in the cavity S0 is irradiated with light to cure the photo-curable material 100, thereby manufacturing the bolt 10 made of the photo-curable material 100. FIG. In the fastening structure in which the fastened members 2 and 3 are fastened by the bolt 10 and the nut 20, the nut 20 is attached to the fastened member 2 so that the inside of the nut is connected to the bolt insertion holes 2a and 3a of the fastened members 2 and 3. , 3, and the shaft portion 12 of the bolt 10 made of the photocurable material 100 is hardened in a state in which the bolt insertion holes 2a and 3a and the inside of the nut 20 are filled. [Selection drawing] Fig. 5

Description

TECHNICAL FIELD The present invention relates to a fastening structure using a bolt and a nut, a bolt manufacturing method, and a bolt former used for manufacturing the bolt.

In recent years, photocurable materials such as ultraviolet curable resins have been used in various fields. For example, Patent Literature 1 discloses a technique of fixing a stud bolt to a resin member for a vehicle body using an adhesive made of an ultraviolet curable resin.

JP 2018-016056 A

The inventors of the present application are earnestly studying countermeasures against the problem of loosening of bolts caused by vibration or the like in connection using bolts and nuts. Note that Patent Literature 1 does not propose a technique for preventing loosening of the bolt.

Accordingly, an object of the present invention is to prevent loosening of bolts by utilizing the properties of photocurable materials.

One aspect of the present invention is a fastening structure in which a member to be fastened is fastened with a bolt and a nut,
The nut is in close contact with the member to be fastened so that the inside of the nut is connected to the bolt insertion hole of the member to be fastened,
The bolt has a shaft made of a photocurable material,
The shaft portion is hardened in a state in which the bolt insertion hole and the inside of the nut are filled ,
An end surface of the shaft opposite to the member to be fastened and an end surface of the nut opposite to the member to be fastened are arranged on the same plane in the central axis direction of the shaft . characterized by

A method for manufacturing a bolt according to an aspect of the present invention comprises:
a cavity forming step of forming a cavity for forming a bolt including the inner space of the bolt insertion hole of the member to be fastened and the inner space of the nut;
a filling step of filling the cavity with a photocurable material;
a curing step of irradiating the photocurable material filled in the cavity with light to cure the photocurable material;
are performed in this order to manufacture a bolt made of the photocurable material.

A bolt former according to one aspect of the present invention comprises:
a first mold for molding the head of the bolt;
a second molding die for molding the tip portion of the shaft portion of the bolt;
A bolt molding cavity is formed between the first mold and the second mold, and includes an internal space of the first mold, an internal space of the bolt insertion hole of the member to be fastened, and an internal space of the nut. , the first molding die is held in contact with the member to be fastened at the peripheral edge of the bolt insertion hole, and the second molding die is held on the side opposite to the first molding die. a holder for holding the member in contact with the member to be fastened via the nut;
a filling port provided in the first mold or the second mold so that the cavity can be filled with a photocurable material;
and an irradiation port provided in the first molding die or the second molding die so as to irradiate the photocurable material filled in the cavity with light.

The “filling port” and the “irradiation port” referred to here may be configured by a common opening, or may be configured by separate openings.

According to the present invention, the member to be fastened is fastened while the bolt made of the photocurable material is adhered to the member to be fastened and the nut, so loosening of the bolt can be effectively suppressed.

It is a sectional view showing a fastening structure concerning one embodiment of the present invention. It is a side view showing a bolt former concerning one embodiment of the present invention. FIG. 4 is a diagram for explaining a cavity forming step in the bolt manufacturing method according to the embodiment of the present invention; It is a figure for demonstrating the filling step in the manufacturing method of the same bolt. It is a figure for demonstrating the hardening step in the manufacturing method of the same bolt.

An embodiment of the present invention will be described below with reference to the accompanying drawings. It should be noted that the following description is essentially merely an example, and is not intended to limit the present invention, its applications, or its uses.

[Fastening structure]
FIG. 1 shows a fastening structure 1 according to this embodiment. In the fastening structure 1 shown in FIG. 1 , the members to be fastened 2 and 3 are fastened with bolts 10 and nuts 20 . In FIG. 1, the members to be fastened 2, 3 and the nut 20 are depicted as cross-sectional views, and the bolt 10 is depicted as a side view.

In this embodiment, an example in which the members to be fastened 2 and 3 are two iron plates will be described. However, in the present invention, the material, shape and number of members to be fastened are not particularly limited. Bolt insertion holes 2a and 3a are provided through the members to be fastened 2 and 3, respectively. The bolt insertion holes 2a and 3a may have the same diameter. The members to be fastened 2 and 3 are superimposed on each other so that the bolt insertion holes 2a and 3a are aligned with each other. The centers of the bolt insertion holes 2a and 3a are arranged on the same axis, for example.

A general nut may be used as the nut 20 . That is, the nut 20 may have a hexagonal columnar outer shape, and the inner peripheral surface 21 of the nut 20 may be formed with a female thread. However, the outer shape of the nut 20 is not particularly limited, and may be cylindrical, for example. Formation of a female thread on the inner peripheral surface 21 of the nut 20 is not essential. In the case where the inner peripheral surface 21 of the nut 20 does not have a female thread, the shape of the inner peripheral surface 21 is not particularly limited. is preferably provided in

One end surface 20a of the nut 20 is a surface facing the member 3 to be fastened. An end surface 20a of the nut 20 is in close contact with the member 3 to be fastened. The inside of the nut 20 is arranged so as to communicate with the bolt insertion holes 2a and 3a of the members 2 and 3 to be fastened. An end face 20a of the nut 20 may be provided with a positioning projection 22 that can be engaged with the inner peripheral surfaces of the bolt insertion holes 2a and 3a. The convex portion 22 is provided, for example, in an annular shape so as to surround the hole of the nut 20 . However, the protrusions 22 may be intermittently provided at a plurality of locations in the circumferential direction at intervals.

The material of the nut 20 is not particularly limited. For example, the material of the nut 20 may be metal such as iron, brass, and stainless steel, or may be resin.

In the conventional fastening work, pre-manufactured bolts are used, but in the present embodiment, the bolt 10 is manufactured during the fastening work. In other words, the fastening work is completed at the same time when the bolt 10 is completed. A method of manufacturing the bolt 10 will be described later.

The bolt 10 has a head portion 11 and a shaft portion 12 extending in one direction from the head portion 11 . In this embodiment, the head portion 11 and the shaft portion 12 are integrally formed. The head portion 11 and the shaft portion 12 are made of a photocurable material. As the photocurable material, for example, a photocurable resin such as an ultraviolet curable resin is used. As the photocurable material, a material having required strength and required adhesive strength in a cured state is used.

Head 11 may have a shape and size similar to a typical bolt head. That is, the head 11 may have a hexagonal prism-like outer shape. However, the outer shape of the head 11 is not particularly limited, and may be cylindrical, for example. The head 11 is hardened in a state of being in close contact with the member to be fastened 2 from the opposite side of the nut 20 . The head 11 is adhered to the member to be fastened 2 at the periphery of the bolt insertion hole 2a.

The shaft portion 12 is hardened while filling the bolt insertion holes 2a and 3a of the members to be fastened 2 and 3 and the inside of the nut 20 . The shaft portion 12 includes a base portion 13 extending from the head portion 11 and engaged with the bolt insertion holes 2a and 3a, and an extension portion extending from the base portion 13 in the opposite direction to the head portion 11 and engaged with the nut 20. 14.

The base portion 13 is formed in a cylindrical shape. The outer diameter of the base portion 13 is equal to the inner diameter of the bolt insertion holes 2a, 3a. The outer peripheral surface of the base portion 13 is in close contact with and adhered to the inner peripheral surfaces of the bolt insertion holes 2a and 3a over the entire circumference.

The extension part 14 is a bar-shaped part having a male thread on its outer peripheral surface. The outer diameter of extension 14 is equal to the inner diameter of nut 20 . The outer peripheral surface of the extension portion 14 is in close contact with and adhered to the inner peripheral surface 21 of the nut 20 over the entire circumference.

In the axial direction, the extension 14 is arranged over the entire length of the nut 20 . In this embodiment, the end face 14a of the extension 14 is arranged on the same plane as the end face 20b of the nut 20. As shown in FIG. That is, the extension part 14 is arranged so as to be accommodated inside the nut 20 . However, the extension part 14 may be arranged so as to protrude outside the end surface 20 b of the nut 20 .

[Bolt former]
For example, a bolt former 30 shown in the side view of FIG. 2 is used to manufacture the bolt 10 (see FIG. 1). The bolt former 30 is used by being fixed to the mounting position of the bolt 10 in the members 2 and 3 to be fastened.

The bolt forming device 30 includes a first forming die 31 for forming the head portion 11 of the bolt 10, a second forming die 41 for forming the tip portion of the shaft portion 12 of the bolt 10, and the first forming die 31. and a holder 50 for holding the second mold 41 .

The first molding die 31 has a mating surface 31 a that is pressed against the member 2 to be fastened. The mating surface 31a of the first molding die 31 is provided with a concave portion 32 filled with a photocurable material. The head 11 of the bolt 10 is formed by the photocurable material filled in the recess 32 . The contour of the recess 32 is larger than the bolt insertion hole 2a of the member 2 to be fastened. As a result, the head portion 11 having a larger diameter than the bolt insertion hole 2a is formed.

The first molding die 31 is provided with an opening 34 that communicates with the internal space S1 (see FIG. 3) of the recess 32 . The opening 34 is a through hole penetrating the first molding die 31 so as to connect the internal space S<b>1 of the recess 32 and the external space of the first molding die 31 . The opening 34 is provided, for example, in a tapered shape such that the diameter becomes smaller as it approaches the internal space S<b>1 of the recess 32 . In this embodiment, the opening 34 is provided in the bottom surface of the recess 32 so that the internal space S1 of the recess 32 can be opened to the side opposite to the mating surface 31a. More specifically, the opening 34 is provided, for example, in the center of the bottom surface of the recess 32 .

As will be described later, the opening 34 can function as a filling port capable of being filled with a photocurable material. In addition, as will be described later, the opening 34 can also function as an irradiation port capable of irradiating the filled photocurable material with light. That is, the filling port and the irradiation port in this embodiment are configured by the common opening 34 provided in the first molding die 31 .

The first molding die 31 is provided with a shutter portion 36 capable of opening and closing the opening portion 34 . The shutter section 36 is composed of a transparent plate-like member. The shutter portion 36 is arranged to extend in a strip shape along the bottom surface of the concave portion 32 of the mating surface 31a. The shutter part 36 is attached to the first mold 31 so as to be slidable in the longitudinal direction. As a result, the position of the shutter portion 36 can be switched between a closed position that closes the opening 34 and an open position that opens the opening 34 .

The shutter part 36 is provided through the first molding die 31 so as to straddle the internal space S<b>1 of the recess 32 and the external space of the first molding die 31 . At one end of the shutter portion 36 arranged in the internal space S1 of the recess portion 32, a projection portion 36a for retaining the shutter portion 36 may be provided. The other end of the shutter portion 36 arranged in the outer space of the first molding die 31 may be provided with a gripping piece 36b for the user to grip.

In the present embodiment, the second molding die 41 is composed of parts separate from the first molding die 31 . The second molding die 41 has a facing surface 41a that faces the member 3 to be fastened. A recess 42 for fitting the nut 20 is provided in the facing surface 41a.

When manufacturing the bolt 10 , the second molding die 41 is pressed against the member 3 to be fastened via the nut 20 fitted in the recess 42 . In this state, the bottom surface of the recess 42 is pressed against the end surface 20b of the nut 20. As shown in FIG. As a result, the internal space S4 (see FIG. 3) of the nut 20 is closed by the second molding die 41, and the extended portion 14 of the shaft portion 12 of the bolt 10 can be formed in the internal space S4 of the nut 20. As shown in FIG.

The holder 50 holds the first molding die 31 and the second molding die 41 together so that a bolt molding cavity S0 (see FIG. 3) is formed between the first molding die 31 and the second molding die 41. It can be held. The configuration of cavity S0 will be described later.

The holder 50 is for pressing the first molding die 31 and the second molding die 41 against each other via an arm portion 52 connected to the first molding die 31 at one end, and the fastened members 2 and 3 and the nut 20 . A pressing mechanism 60 is provided.

The arm portion 52 is provided so as to extend while bending or curving in a U-shape, for example, so as to avoid interference with the members 2 and 3 to be fastened. Note that the arm portion 52 may be provided with a dimension adjusting mechanism for adjusting at least one dimension of the lateral direction and the vertical direction in FIG. 2 .

A support portion 54 that supports the pressing mechanism 60 is provided at the end portion of the arm portion 52 opposite to the first molding die 31 . The support portion 54 is arranged to face the mating surface 31 a of the first molding die 31 . The support portion 54 is provided with a screw hole 61 (see FIG. 3) penetrating the support portion 54 .

The pressing mechanism 60 includes a pressing member 62 attached to the support portion 54 of the arm portion 52 so as to be able to press the second molding die 41 toward the first molding die 31 . The pressing member 62 is a screw member engaged with the screw hole 61 (see FIG. 3) of the support portion 54 . The pressing member 62 is arranged to extend along the direction in which the first molding die 31 and the support portion 54 face each other. The pressing member 62 is axially translatable while rotating about its axis.

A pressing portion 64 that is pressed against the second molding die 41 is provided at the tip of the pressing member 62 on the side of the first molding die 31 . The end surface of the pressing portion 64 may be a curved surface that swells toward the tip.

A handle connecting portion 66 is provided at the end of the pressing member 62 opposite to the pressing portion 64 . A handle 68 to be gripped by the user is attached to the handle connection portion 66 . The handle 68 slidably penetrates the handle connection portion 66, for example.

The user can rotate the pressing member 62 around the axis while gripping the handle 68 . The rotationally operated pressing member 62 is translated so that the pressing portion 64 approaches or separates from the first molding die 31 .

In a state in which the first molding die 31 and the second molding die 41 are pressed against each other via the fastened members 2 and 3 and the nut 20 by the pressing mechanism 60 of the holder 50 configured as described above, the first molding die 31 is held in contact with the member to be fastened 2 at the peripheral edge of the bolt insertion hole 2a, and the second molding die 41 presses the member to be fastened 3 via the nut 20 on the side opposite to the first molding die 31. is held against the

[Bolt manufacturing method]
A method of manufacturing the bolt 10 will be described with reference to FIGS. In this embodiment, the bolt 10 is manufactured using the bolt former 30 described above. 3 to 5 are side views similar to FIG. 2, but in FIGS. 3 to 5, a part of the bolt former 30, the members to be fastened 2 and 3, and the nut 20 are drawn as sectional views. is

First, in the cavity forming step shown in FIG. 3, a cavity S0 for bolt molding is formed between the first molding die 31 and the second molding die 41. As shown in FIG.

Specifically, first, the members to be fastened 2 and 3 are overlapped so that the bolt insertion holes 2a and 3a are aligned with each other. Thereby, the internal spaces S2 and S3 of the bolt insertion holes 2a and 3a of the members to be fastened 2 and 3 communicate with each other. After that, the nut 20, the second molding die 41, and the first molding die 31 are aligned with the fastened members 2 and 3 as follows.

The nut 20 is positioned so that the internal space S4 of the nut 20 communicates with the internal space S3 of the bolt insertion hole 3a of the member 3 to be fastened, and overlapped on the member 3 to be fastened. At this time, positioning can be easily performed by inserting the positioning protrusion 22 provided on the nut 20 into the bolt insertion hole 3a of the member 3 to be fastened.

The second molding die 41 is applied to the nut 20 so as to face the internal space S4 of the nut 20 . In this embodiment, the bottom surface of the concave portion 42 of the second mold 41 is brought into contact with the end surface 20b of the nut 20 . As a result, the internal space S4 of the nut 20 is closed from the side opposite to the member 3 to be fastened.

Either the positioning of the nut 20 with respect to the member to be fastened 3 or the positioning of the second molding die 41 with respect to the nut 20 may be performed first. In other words, the second forming die 41 may be placed over the nut 20 that has been overlaid on the member 3 to be fastened first, or the nut 20 that has been previously fitted in the second forming die 41 may be overlaid on the member 3 to be fastened. may be

The first molding die 31 is brought into contact with the member to be fastened 2 so as to face the bolt insertion hole 2a from the side opposite to the nut 20 . Specifically, the mating surface 31a of the first molding die 31 is brought into contact with the member to be fastened 2 at the periphery of the bolt insertion hole 2a. As a result, the internal space S1 of the concave portion 32 of the first molding die 31 communicates with the internal space S2 of the bolt insertion hole 2a of the member 2 to be fastened.

As described above, by aligning the first molding die 31, the fastened members 2 and 3, the nut 20, and the second molding die 41 with each other, the internal space S1 of the concave portion 32 of the first molding die 31, The internal spaces S2, S3 of the bolt insertion holes 2a, 3a of the fastened members 2, 3 and the internal space S4 of the nut 20 communicate with each other. As a result, one cavity S0 composed of spaces S1, S2, S3, and S4 communicating with each other is formed between the first mold 31 and the second mold 41 as described above.

The first forming die 31 and the second forming die 41 arranged as described above are fixed to the members to be fastened 2 and 3 by pressing against each other via the members to be fastened 2 and 3 and the nuts 20 . Such fixing of the first molding die 31 and the second molding die 41 is performed by rotating the pressing member 62 via the handle 68 . By this rotating operation, the pressing member 62 is translated in a direction approaching the first molding die 31 , and the pressing portion 64 of the pressing member 62 presses the second molding die 41 toward the first molding die 31 . .

As a result, when the first molding die 31 and the second molding die 41 are pressed against each other with a required pressing force, the first molding die 31, the fastened members 2 and 3, the nut 20, and the second molding die 41 are pressed against each other. Displacement is restricted. Therefore, the cavity S0 can be maintained in a desired spatial shape. Further, at this time, a compression force required for fastening can be applied to the members to be fastened 2 and 3 sandwiched between the first molding die 31 and the second molding die 41 .

Subsequently, the filling step shown in FIG. 4 is performed. The filling step is performed in a state where the shutter portion 36 is arranged at the open position and the opening portion 34 of the first molding die 31 is opened.

In the filling step, the cavity S0 is filled with the photocurable material 100 through the opening 34 using an injection device (not shown) such as a glue gun. The filling step is performed until cavity S0 is filled with photocurable material 100. FIG.

Subsequently, the curing step shown in FIG. 5 is performed. The curing step is performed while the opening 34 of the first mold 31 is blocked by the shutter 36 . As a result, the curing step can be performed while restricting leakage of the photocurable material 100 to the outside of the cavity S0.

In the curing step, an irradiation device (not shown) such as a penlight is used to irradiate the photocurable material in the cavity S0 from the opening 34 with light 200 having a predetermined wavelength. Here, the light 200 can pass through the shutter portion 36 because the shutter portion 36 is transparent. The irradiation of the light 200 continues for a predetermined time. As a result, the photocurable material in the cavity S0 is cured, and the bolt 10 made of the photocurable material 100 is formed into a desired shape.

Thereafter, when the pressing member 62 is translated away from the first molding die 31 by rotating the pressing member 62 via the handle 68 , the second molding die 41 is removed from the nut 20 or the bolt 10 is removed. The first molding die 31 can be removed from the head 11 .

Through the above procedure, the manufacture of the bolt 10 and the fastening of the fastened members 2 and 3 with the bolt 10 and the nut 20 are completed at the same time.

[Effect]
According to this embodiment, in the fastened state (see FIG. 1), the shaft portion 12 of the bolt 10 made of a photocurable material is positioned between the inner peripheral surfaces of the bolt insertion holes 2a and 3a of the fastened members 2 and 3 and the nut 20. The head portion 11 of the bolt 10 made of a photocurable material is adhered to the surface of the member 2 to be fastened. Loosening of the bolt 10 can be effectively suppressed by the action of these adhesive forces.

Further, the manufacturing of the bolt 10 and the fastening of the members to be fastened 2 and 3 by the bolt 10 and the nut 20 are performed in a state where the members to be fastened 2 and 3 are applied with a required compressive force. The action of this compressive force is maintained even after the bolt 10 is completed, that is, after the fastening is completed. Therefore, the fastening force of the fastened members 2 and 3 can be maintained satisfactorily.

Furthermore, according to this embodiment, the fastening of the fastened members 2 and 3 and the locking of the bolt 10 can be completed at the same time. Therefore, a dedicated part and a dedicated process for preventing loosening of the bolt 10 are not required.

Although the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

For example, the bolt former 30 may not necessarily be used to manufacture the bolt 10 , and various changes may be made to the configuration of the bolt former 30 .

For example, in the bolt former 30 described above, the first mold 31 is provided with the opening 34 , but the second mold 41 may be provided with an opening having the same function as the opening 34 .

In addition, in the bolt former 30 described above, the filling port and the irradiation port are configured by the common opening 34, but in the present invention, the filling port and the irradiation port may be configured by separate openings.

Furthermore, in the present invention, the configuration of the cavity for forming the bolt is not limited to the configuration of the cavity S0 described above, as long as it includes at least the internal space of the bolt insertion hole of the member to be fastened and the internal space of the nut. . For example, as a part of the cavity for bolt molding, a space for molding a bolt portion protruding outside the end surface 20b of the nut 20 is formed between the bottom surface of the recess 42 of the second molding die 41 and the end surface 20b of the nut 20. may be formed between

1 fastening structure 2, 3 member to be fastened 2a, 3a bolt insertion hole 10 bolt 11 head 12 shaft 20 nut 22 positioning projection 30 bolt former 31 first mold 34 opening (filling port, irradiation port)
36 shutter part 41 second molding die 50 holder 52 arm part 60 pressing mechanism 61 screw hole 62 pressing member 100 photocurable material 200 light S0 cavity for bolt molding

Claims (13)

A fastening structure in which a member to be fastened is fastened with a bolt and a nut,
The nut is in close contact with the member to be fastened so that the inside of the nut is connected to the bolt insertion hole of the member to be fastened,
The bolt has a shaft made of a photocurable material,
The shaft portion is hardened in a state in which the bolt insertion hole and the inside of the nut are filled ,
An end surface of the shaft opposite to the member to be fastened and an end surface of the nut opposite to the member to be fastened are arranged on the same plane in the central axis direction of the shaft . A fastening structure characterized by
The bolt has a head made of a photocurable material,
2. The fastening structure according to claim 1, wherein the head is hardened while being in close contact with the member to be fastened from the opposite side of the nut. 3. The nut according to claim 1, wherein the surface of the nut that faces the member to be fastened is provided with a positioning protrusion that can be engaged with the inner peripheral surface of the bolt insertion hole. fastening structure. a cavity forming step of forming a cavity for forming a bolt including the inner space of the bolt insertion hole of the member to be fastened and the inner space of the nut;
a filling step of filling the cavity with a photocurable material;
a curing step of irradiating the photocurable material filled in the cavity with light to cure the photocurable material;
A method of manufacturing a bolt, characterized in that the bolt is manufactured from the photocurable material by performing the steps in this order. In the cavity forming step, a first molding die for molding the head portion of the bolt is brought into contact with the member to be fastened so as to face the bolt insertion hole from the side opposite to the nut, and the shaft portion of the bolt is formed. A second molding die for molding the tip portion is applied to the nut so as to face the inner space of the nut, and the cavity is formed between the first molding die and the second molding die. 5. A method of manufacturing a bolt according to claim 4. 6. The method of manufacturing a bolt according to claim 5, wherein in the filling step, the cavity is filled with the photocurable material through an opening provided in the first mold or the second mold. 7. The method of manufacturing a bolt according to claim 6, wherein in the curing step, the photocurable material in the cavity is irradiated with light from the opening. a first mold for molding the head of the bolt;
a second molding die for molding the tip portion of the shaft portion of the bolt;
A bolt molding cavity is formed between the first mold and the second mold, and includes an internal space of the first mold, an internal space of the bolt insertion hole of the member to be fastened, and an internal space of the nut. , the first molding die is held in contact with the member to be fastened at the peripheral edge of the bolt insertion hole, and the second molding die is held on the side opposite to the first molding die. a holder for holding the member in contact with the member to be fastened via the nut;
a filling port provided in the first mold or the second mold so that the cavity can be filled with a photocurable material;
and an irradiation port provided in the first molding die or the second molding die so as to irradiate the photocurable material filled in the cavity with light. 9. The bolt molding according to claim 8, wherein the holder comprises a pressing mechanism for pressing the first molding die and the second molding die against each other via the member to be fastened and the nut. vessel. The holder comprises an arm connected at one end to the first mold,
10. The pressing mechanism according to claim 9, further comprising a pressing member attached to the other end of the arm so as to press the second molding die against the first molding die. Bolt former as described. 11. The bolt former according to claim 10, wherein said pressing member is a screw member engaged with a screw hole passing through said other end of said arm. 12. The bolt former according to any one of claims 8 to 11, wherein the filling port and the irradiation port are a common opening provided in the first molding die. 13. The bolt forming machine according to claim 12, wherein the first forming die is provided with a transparent shutter part capable of opening and closing the opening.

Images