JP2001338544A - Method for manufacturing polymer insulator, polymer insulator and die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a polymer insulator, the polymer insulator and a die used in the method for manufacturing the polymer insulator that can caulk a core material and a support material easily and certainly by utilizing effectively a tube part of the support material and fix them certainly and excellently. SOLUTION: A polymer insulator is manufactured in one time of caulking and by using a die 6. A contact surface 7a which makes contact with an intake side edge 4a of a tube 4 of the support metal fitting 2 is formed wider than a contact surface 7b making contact with inside portion 4b of the tube 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a polymer insulator, a polymer insulator, and a die.
The present invention mainly relates to a method for producing a polymer insulator using a fiber-reinforced plastic as a core material, the polymer insulator, and a die used for the method for producing the polymer insulator.

[0002]

2. Description of the Related Art In recent years, fiber reinforced plastics (hereinafter referred to as FR) having excellent features such as light weight, easy processing, and high strength.
Abbreviated as P. ) And the like, and the use of polymer insulators as a core material is becoming widespread. Such a polymer insulator is usually manufactured by inserting a core material made of FRP into a cylindrical support having a bottom and then crimping the support.

[0003] In the case of caulking the support fitting as described above, if the caulking is performed too strongly, the core material is damaged,
If it is swaged too weakly, the core material and the support metal are not sufficiently pressed and cannot be fixed. Therefore, various caulking methods have been proposed.

For example, Japanese Patent Application Laid-Open No. 9-231847 discloses that a caulking portion of a support fitting is divided and caulked a plurality of times from the opening end to the other end while sequentially increasing the compression pressure. Thus, it is described that a high bonding strength between the core material and the support metal is obtained.

[0005] For example, see Japanese Patent Application Laid-Open No. 10-26987.
Japanese Patent Application Laid-Open No. 8-108803 discloses a modification of the first range in which the swaged portion of the support bracket includes a portion including the open end thereof as a first range, and the remaining portion continuous with the first range as a second range. It is described that by caulking the amount gradually toward the second range, the stress concentration at the open end of the support bracket is reduced, and the long-term strength reduction rate is reduced. In the caulking method described in Japanese Patent Application Laid-Open No. Hei 10-269878, a first compression surface and a second compression surface having different inclination angles with respect to a compression target surface of a support bracket are used as dies for caulking. A dice having a surface is used, and it is described that swaging is performed once using such a dice.

[0006]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. Hei 9-2
In the caulking method described in Japanese Patent No. 31847, since the caulking is performed a plurality of times, the compression pressure changes discontinuously at the boundary of each compression part, and therefore, the nonuniform compression pressure is applied to the entire support fitting. The core material may be damaged.
In addition, when divided and caulked a plurality of times, there is a gap between the compressed parts, or there is a case where each compressed part is overlapped and compressed, and if a gap occurs, the clearance If the joint strength is reduced without being effectively used, and the compressed portions are compressed in an overlapping manner, the core material is more likely to be damaged. Further, when swaging is performed a plurality of times, the swaging process becomes complicated, and the device configuration for swaging becomes complicated.

In the caulking method described in Japanese Patent Application Laid-Open No. H10-269878, a die having a first compression surface and a second compression surface having different inclination angles is used, as shown in FIG. In the die 10, a first compression surface 13 for compressing the opening end 12 of the support fitting 11 is provided.
However, since the angle of inclination of the support fitting 11 with respect to the compressed surface is larger than that of the second compression surface 14, when caulking with the die 10, the compressed surface at the open end 12 of the support fitting 11 and the first When the gap between the compression surface 13 and the compression surface 13 becomes wide, and a slight error occurs in the compression pressure due to the clearance, the applied compression pressure escapes at the open end 12 of the support fitting 11. It does not work reliably, resulting in a problem that the bonding strength becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to enable simple and reliable caulking by effectively utilizing the cylindrical portion of the support member. A method for manufacturing a polymer insulator, which can securely and satisfactorily fix a support member, a polymer insulator thereof,
Another object of the present invention is to provide a die used in the method for manufacturing the polymer insulator.

[0009]

According to one aspect of the present invention, there is provided a polymer comprising a plastic core and a support member having a cylindrical portion into which the core is inserted. In the method of manufacturing an insulator, after inserting the core material into the cylindrical portion, by caulking the cylindrical portion,
In the step of fixing the core member to the support member, the cylindrical portion is formed such that a contact surface that contacts an inlet-side end of the cylindrical portion is wider than a contact surface that contacts an inner portion of the cylindrical portion. It is characterized in that it is caulked once using a dice.

According to such a method, when the cylindrical portion is swaged by the die, the wider contact surface of the die contacts the end of the cylindrical portion on the inlet side, so that the compression pressure is reduced accordingly. At the same time, the narrower contact surface of the die comes into contact with the inner portion of the cylindrical portion, so that the compression pressure is correspondingly increased to act. Therefore, by one caulking, the inlet end of the cylindrical portion can be caulked at a lower compression pressure, and the inner portion of the cylindrical portion can be caulked at a higher compression pressure, and can be securely caulked. Stress concentration at the entrance-side end of the support member can be reduced, and durability can be improved.

Also, since it can be caulked at once,
By effectively utilizing the length of the cylindrical portion, the compression pressure in the cylindrical portion can be continuously changed. Therefore, it is possible to effectively prevent the core material from being damaged due to the discontinuous change in the compression pressure, and it is possible to caulk easily and reliably.

Furthermore, in this method, the contact angle of the die with the cylindrical portion is the same, and the contact pressure of the die is changed by changing the contact area of the die. And the compression pressure corresponding to the inner part can be reliably applied. Therefore, for example, as compared with the case of using a die having two surfaces having different inclination angles with respect to the cylindrical portion, the caulking can be performed more stably and surely, and a caulking having a greater degree of freedom can be achieved. Can be.

The invention described in claim 2 is the first invention.
In the invention described in (1), four to eight dies are arranged around the cylindrical portion, and the cylindrical portion is caulked.

By caulking in this manner, a more uniform and reliable compression pressure can be applied around the cylindrical portion in one caulking. Therefore, it is possible to further effectively and easily prevent the core material from being damaged and easily and securely caulk.

According to a third aspect of the present invention, there is provided a polymer insulator comprising a plastic core material and a support member having a cylindrical portion into which the core material is inserted.
After being inserted into the cylindrical portion, by using a die, the cylindrical portion is formed such that the contact surface that contacts the inlet-side end of the cylindrical portion is wider than the contact surface that contacts the inner portion of the cylindrical portion. 1
It is characterized in that it is fixed to the support member by being swaged by turning.

In such a polymer insulator, since the compression pressure is continuously changed in the cylindrical portion and caulked easily and securely, the core material is not damaged, and the length of the cylindrical portion is reduced. Is effectively used and caulked, so that even if the length of the support member is short, the core member and the support member are firmly fixed, and excellent durability can be exhibited.

Further, the invention according to claim 4 is used for manufacturing a polymer insulator having a plastic core material and a support member having a cylindrical portion into which the core material is inserted. A die for fixing the core material to the support member by caulking the tubular portion after being inserted into the tubular portion, wherein a contact surface that contacts an inlet-side end of the tubular portion has a cylindrical surface. It is characterized in that it is formed wider than the contact surface that contacts the inner part of the.

When the cylindrical portion of the supporting member is swaged by using such a die, a wider contact surface of the die contacts the end of the cylindrical portion on the inlet side, and the compression pressure is reduced accordingly. At the same time, the narrower contact surface of the die comes into contact with the inner portion of the cylindrical portion, so that the compression pressure is increased accordingly. Therefore, by one caulking, it is possible to caulk the end on the inlet side of the cylindrical portion with a lower compression pressure and to caulk the inner portion of the cylindrical portion with a higher compression pressure.

Therefore, stress concentration at the entrance end of the support member can be reduced. In addition, since it can be swaged at one time, the compression pressure can be continuously changed in the tubular portion by effectively using the length of the tubular portion,
It is possible to effectively prevent the core material from being damaged due to the discontinuous change in the compression pressure, and it is possible to caulk easily and reliably.

Furthermore, in this die, the contact angle of the die to the cylindrical portion is made the same, and the contact area is changed to change the surface pressure, thereby caulking.
It is possible to reliably apply a compression pressure corresponding to the inlet end and the inner part of the cylindrical part. So, for example,
Compared to the case of using a dice having two surfaces having different inclination angles with respect to the cylindrical portion, caulking can be performed more stably and reliably, and caulking with a greater degree of freedom can be achieved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing an embodiment of a polymer insulator according to the present invention, and FIG. 2 is a schematic diagram showing a main part of a process for manufacturing the polymer insulator. As shown in FIG. 1, this polymer insulator has a solid cylindrical FR shape.
A core 1 made of P, a support 2 as a support member into which both ends of the core 1 are inserted, and a cover 3 covering the core 1 over its length. Support bracket 2
Has a cylindrical portion 4 having a bottomed cylindrical shape, into which an end of the core material 1 is inserted. The cover 3 is made of silicone rubber, and has a plurality of bulged protrusions 5 extending outward in the radial direction at predetermined intervals.

In such a polymer insulator, as shown in FIG. 2, after the core material 1 is inserted into the cylindrical portion 4, the cylindrical portion 4 is caulked with a die 6, so that the core material 1 To fix it.

The die 6 used for such caulking includes a contact surface 7a contacting the inlet end 4a of the cylindrical portion 4.
However, one that is formed wider than the contact surface 7b that contacts the inner portion 4b of the cylindrical portion 4 is used. More specifically, for example, one shown in FIG. 3 is used. That is, in FIG. 3, the die 6 has a substantially triangular prism shape, and at one corner thereof, a contact surface 7 for applying a compressive pressure to the cylindrical portion 4 of the support fitting 2 is formed. The contact surface 7 is formed in a tapered shape such that the area on the upper side is large and the area on the lower side is small.
When the cylindrical portion 4 is swaged with the above, the upper side thereof is opposed to the inlet side end 4a of the cylindrical portion 4, and the center or lower side thereof is the cylindrical portion 4a.
And a contact surface 7 that contacts the inlet-side end 4 a of the cylindrical portion 4.
a, and the center or lower contact surface thereof is defined as a contact surface 7b contacting the inner portion 4b of the cylindrical portion 4.
To make contact. Also, as shown in FIG. 4, this swaging is performed by placing such a die 6 around the cylindrical portion 4 by 8 mm.
They are placed individually and swaged.

In this method, after the die 6 is arranged in this manner, the core 1 is fixed to the support fitting 2 only by caulking the cylindrical portion 4 once. The compression pressure for caulking is appropriately selected according to the diameter of the cylindrical portion 4 and the type of the polymer insulator, but is, for example, about 5 to 30 MPa. Such caulking is usually performed by a caulking device that operates the die 6 by hydraulic pressure.

When the cylindrical portion 4 is swaged by the die 6, the wider contact surface 7a of the die 6 comes into contact with the inlet-side end 4a of the cylindrical portion 4. The compression pressure is reduced and the cylinder portion 4 operates.
Since the narrower contact surface 7b of the die 6 comes into contact with the inner portion 4b of the die 6, the compressive pressure is increased by that amount to act. Therefore, even if it is caulking only once, the inlet end 4a of the cylinder part 4 can be caulked with a lower compression pressure and the inner part 4b of the cylinder part 4 can be caulked with a higher compression pressure. The core material 1 can be easily and reliably reduced while reducing the stress concentration at the inlet end 4a of the core material 4 and improving durability.
Can be fixed to the support fitting 2.

Also, since it can be caulked at once,
By effectively utilizing the length of the cylinder 4, the compression pressure in the cylinder 4 can be continuously changed. Therefore, it is possible to effectively prevent the core material 1 from being damaged due to the discontinuous change in the compression pressure, and it is possible to caulk easily and reliably.

Further, in this method, the contact angle of the die 6 with the cylinder 4 is set to be the same, and the contact area of the die 6 is changed to change the surface pressure. The compression pressure corresponding to the inlet end 4a and the inner portion 4b can be reliably applied. Therefore, for example, compared to the case of using a die having two surfaces having different inclination angles with respect to the cylinder portion 4, caulking can be performed more stably and surely, and caulking with a greater degree of freedom can be achieved. be able to.

In this method, since eight dies 6 are arranged around the cylindrical portion 4 and caulked, a uniform and reliable compression pressure can be applied around the cylindrical portion 4. Therefore, it is possible to further effectively prevent damage to the core material 1 and easily and securely caulk.

Therefore, the polymer insulator in which the core 1 is fixed to the support 2 by such a method does not damage the core 1 and has a short length even if the length of the support 2 is short. 1 and the support fitting 2 are firmly fixed, and excellent durability can be exhibited.

Further, the die 6 used for such caulking is not limited to the one shown in FIG. 3, and the contact surface 7a contacting the inlet side end 4a of the cylindrical portion 4 is formed by the inner portion 4b of the cylindrical portion 4. The shape is not limited as long as it is formed wider than the contact surface 7b that contacts the surface.
A die 6 as shown in FIG.

That is, the die 6 shown in FIG. 5 has a substantially triangular prism shape like the die 6 shown in FIG. 3, and one of the corners is for applying a compressive pressure to the cylindrical portion 4 of the support fitting 2. The contact surface 7 is formed, and the contact surface 7 is formed in a curved shape along the outer diameter of the cylindrical portion 4. Also, the die 6 shown in FIG. 6 has a curved contact surface 7 similarly to the die 6 shown in FIG. In contrast, it is narrower.

In the above description, the die 6
Are arranged around the cylindrical portion 4, but the number is not limited at all. For example, in order to make the compression pressure more uniform, 16 times the number may be arranged. However, if the number is too large, the device configuration becomes complicated.
Four to eight are arranged.

In the above description, the cylindrical portion 4 is a portion of the support fitting 2 that is in contact with the die 6, ie, a portion that is caulked by the die 6. , Is a portion of about 5 to 10 mm inward from the inlet side of the cylindrical portion 4, and the inner portion 4 b is a portion that continues to the inlet side portion 4 a and further inwards.

In the above description, "caulking" refers to pressing the core member and the support member by applying pressure from outside the cylindrical portion, and is not to be construed as limiting.

[0035]

As described above, according to the first aspect of the present invention, the compression pressure is continuously changed in the cylindrical portion while the length of the cylindrical portion is effectively used, and caulking is performed. Can be. Therefore, damage to the core material can be effectively prevented, and caulking can be performed simply and reliably.
In addition, since the contact angle of the die with respect to the cylindrical portion is set to be the same and the surface pressure of the die is changed and swaged, the swage angle with respect to the cylindrical portion is different from the case of using a die having two different surfaces and swaged. The caulking can be performed stably and surely, and caulking with a greater degree of freedom can be achieved.

According to the second aspect of the present invention, the core material can be more effectively prevented from being damaged, and the core material can be easily and reliably caulked.

According to the third aspect of the present invention, even if the core member is not damaged and the length of the supporting member is short, the space between the core member and the supporting member is firmly fixed, so that an excellent structure is obtained. Durability can be exhibited.

According to the fourth aspect of the present invention, the compression pressure can be continuously changed in the cylindrical portion while caulking while effectively utilizing the length of the cylindrical portion. Therefore, damage to the core material can be effectively prevented, and caulking can be performed simply and reliably. In addition, since the contact angle of the die with the cylindrical portion is set to be the same and the surface pressure of the die is changed and swaged, the inclination angle with respect to the cylindrical portion is different.
Compared to caulking using a dice with one side,
The caulking can be performed more stably and surely, and caulking having a greater degree of freedom can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a polymer insulator of the present invention.

FIG. 2 is a schematic view of a main part showing a manufacturing process of the polymer insulator shown in FIG.

FIG. 3 is a perspective view showing one embodiment of the dice shown in FIG.

FIG. 4 shows a process of manufacturing the polymer insulator shown in FIG.
It is a principal part top view which shows the state which arrange | positions a dice around the cylindrical part of a support metal fitting.

FIG. 5 is a perspective view showing a dice according to an embodiment different from the dice shown in FIG. 3;

FIG. 6 is a perspective view showing a dice according to an embodiment different from the dice shown in FIG. 3;

FIG. 7 is a schematic view of a main part showing a manufacturing process of a conventional polymer insulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 2 Support metal fitting 4 Tube part 4a Inlet side end part of tube part 4b Inner part of tube part 6 Dice 7 Contact surface 7a Contact surface which contacts the inlet side end part of tube part 7b Contactes inner part of tube part Contact surface

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Yoshikazu Kakura, Inventor 3-44-3, Matsubara, Izumisano-shi, Osaka Inside Daito Corporation (72) Kuniichiro Hashimoto 3-chome, Nakanoshima, Kita-ku, Osaka, Osaka No. 22 Kansai Electric Power Company F-term (reference) 5G331 AA03 AA06 BB01 CA05 CA06 DA01 5G333 AB01 AB28 BA01 BA02 CB01 CB17 DA03 DA23

Claims (4)

[Claims] 1. A method for manufacturing a polymer insulator comprising a plastic core material and a support member having a cylindrical portion into which the core material is inserted, wherein the core material is inserted into the cylindrical portion, and By caulking, in the step of fixing the core material to the support member, the cylindrical portion has a contact surface that contacts the inlet-side end of the cylindrical portion, and a contact surface that contacts the inner portion of the cylindrical portion. A method for producing a polymer insulator, which comprises caulking at once using a die that is widely formed. 2. The method according to claim 1, wherein four to eight dies are arranged around the cylindrical portion, and the cylindrical portion is caulked. 3. A polymer insulator comprising a plastic core material and a support member having a cylindrical portion into which the core material is inserted, wherein the core material is inserted into the cylindrical portion, and then the cylindrical portion is inserted into the cylindrical portion. ,
The contact surface that is in contact with the inlet end of the cylindrical portion is fixed to the support member by being swaged at once using a die that is formed wider than the contact surface that contacts the inner portion of the cylindrical portion. A polymer insulator. 4. A method for manufacturing a polymer insulator comprising a plastic core material and a support member having a cylindrical portion into which the core material is inserted, wherein the core material is inserted into the cylindrical portion, and A die for fixing the core material to the support member by caulking a portion, wherein a contact surface that contacts an inlet-side end of the cylindrical portion is more than a contact surface that contacts an inner portion of the cylindrical portion. A die characterized by being widely formed.