JPH10312724A - Polymer insulator molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the outflow of crude rubber from a die and simply position an FRP core by using the first dies parting in the axial direction of a core section for molding the envelopes at both end sections of a polymer insulator constituted of a barrel section and flanges protruded from the barrel section and the second die parting in the radial direction of the flange for molding the envelope at the middle section of the polymer insulator. SOLUTION: This polymer insulator molding die 21 is constituted of the first dies made of ma pair of dies 23-1, 23-2 having parting surface at the flange tip outer peripheral position of a flange section 4-1 at the uppermost section and the flange tip outer peripheral position of a flange section 4-2 at the lowermost section at both ends and molding the portions of the P-face and Q-face of an envelope and the second die made of a pair of dies 22-1, 22-2 provided at the middle of the first dies and molding the portion other than the P-face and Q-face parting in the radial direction of the shade 4 of the polymer insulator 1. The first dies at both end seconds have no parting surface, crude rubber is saved at the time of compression molding, and positioning is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a core, a body provided on the outer peripheral surface of the core, and a plurality of caps protruding from the body. TECHNICAL FIELD The present invention relates to a polymer insulator molding die used for molding a polymer insulator constituting an object.

[0002]

2. Description of the Related Art Conventionally, a core, a body provided on the outer peripheral surface of the core, and a plurality of caps protruding from the body have been used. Various types of polymer insulators are known. FIG. 4 is a diagram showing a configuration of an example of such a polymer insulator which is also an object of the present invention. In FIG. 4, 1 is a polymer insulator, 2 is F
RP core, 3 is a trunk, 4 is a cap, 5 is a jacket composed of a trunk 3 and a cap 4, and 6-1 and 6-2 are metal fittings provided at both ends of the FRP core 2.

[0003] Among the methods for manufacturing the polymer insulator 1 having the above-described configuration, a compression molding method is known as an example of a method of providing the outer cover 5 around the FRP core 2. In this compression molding method, first, as shown in FIG. 5, raw rubber 12 such as silicone rubber having a simple shape is placed around the FRP core 2 and the FR
A pair of molds 11-1 and 11-2 having a dividing surface in the axial direction of the P core 2 and divided in the diameter direction of the shade 4 are pressed from above and below. At this time, as shown in FIG. 6, the split surface of one of the molds 11-2, the flow of the raw rubber 12 due to the compression pressure of the molds 11-1 and 11-2 causes the inside of the molds 11-1 and 11-2. The raw rubber 12 is filled into every corner of the cavity 13. Then, after both divided surfaces of the molds 11-1 and 11-2 come into contact with each other, the filled raw rubber 12 is vulcanized and cured. Thereafter, the molds 11-1 and 11-2 are released as shown in FIG.
A jacket 5 including a body 3 and a shade 4 is formed around the P core 2.

[0004]

In the above-described compression molding method, during the step of pressing the molds 11-1 and 11-2, when the raw rubber 12 enters the cavity 13 of the molds 11-1 and 11-2. At the same time, it flows out from the gap between the divided surfaces of the dies 11-1 and 11-2 until the divided surfaces of the dies 11-1 and 11-2 come into contact with each other. The raw rubber 12 flowing to the outside is wasted, but if the amount of the raw rubber 12 is small, the raw rubber 12 is not filled into the corners of the cavities 13 of the molds 11-1 and 11-2, and a defect is formed in the outer shape. Therefore, it could not be essentially set to zero, and the raw rubber 12 needed to flow to the outside to some extent. Therefore, raw rubber 12
It has been desired to reduce the amount of effluent and to save the raw rubber 12. As shown in FIG. 6, the flow of the raw rubber 12 from the gap between the divided surfaces is caused by a flow F1 of the raw rubber 12 directed in the diameter direction of the cap and a flow F2 of the raw rubber 12 directed in the axial direction of the FRP core 2. The flow F2 at both ends of the mold was larger than the flow F1.

In the above-mentioned compression molding method, as is apparent from FIG. 5, the dies 11-1, 11-2
Until both ends 14-1 and 14-2 abut on the FRP core 2, the raw rubber 12 between the molds 11-1 and 11-2 and the FRP core 2 at both ends 14-1 and 14-2. The FRP core 2 cannot be positioned with respect to the dies 11-1 and 11-2 because it exists between them and the thickness thereof cannot be controlled. Finally, the divided surfaces of the molds 11-1 and 11-2 come into contact with each other, and at the same time, both ends 14-1 and 14-2 are FR
When the FRP core 2 comes into contact with the P core 2, the core of the FRP core 2 comes out.
The raw rubber 12 between the core 2 and the core 2 is not completely discharged, and the amount thereof is not uniform around the circumference. Therefore, FRP core 2
Cannot be held at an accurate position, and the positioning of the FRP core 2 cannot be reliably performed.

An object of the present invention is to solve the above-mentioned problems and to provide a mold for molding a polymer insulator, in which raw rubber flows out from the mold with a small amount, and the positioning of the FRP core can be easily performed. is there.

[0007]

A mold for molding a polymer insulator according to the present invention comprises a core, a body provided on the outer peripheral surface of the core, and a plurality of shades protruding from the body. A mold used for molding a polymer insulator constituting a jacket with the body and the cap, wherein a first part is divided in an axial direction of a core portion for molding both ends of the polymer insulator.
And a second mold that is divided in a diameter direction of a cap for forming an intermediate portion jacket of the polymer insulator.

In the present invention, since the first molds at both end portions have no dividing surface, there is no flow of raw rubber at that portion, and raw rubber can be saved. That is, in the conventional method,
Both ends had a degree of freedom to allow the rubber to flow freely not only in the radial direction but also in the axial direction. Accounted for a large percentage of the total. Therefore, stopping the outflow of the raw rubber in this portion has a great effect of the raw rubber outflow. In addition, by mounting the FRP core in advance on the first molds at both ends, the positioning of the FRP core with respect to the mold can be performed accurately and easily even during compression molding of raw rubber.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing the structure of an example of a mold for forming a polymer insulator of the present invention, and FIG. 2 is a perspective view showing an example of a mold for forming a polymer insulator of the present invention. 3 shows a perspective view of an example of the manufactured polymer insulator. FIG.
Since the configuration of the polymer insulator shown in FIG. 3 to FIG. 3 is the same as the configuration of the conventional polymer insulator shown in FIG. 4, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the example shown in FIGS. 1 to 3, the mold 21 for molding a polymer insulator of the present invention is provided at the outer periphery of the top of the top cap 4-1 located at both ends and at the top of the bottom cap 4-2. Each of the outer peripheral positions is defined as a division surface, and is divided in the axial direction of the polymer insulator 1 to form portions of the P surface and the Q surface of the jacket 5 located outside the upper and lower ends of the caps 4-1 and 4-2 in the axial direction. A first mold composed of a pair of molds 23-1 and 23-2 and a plane provided in the middle of the first mold and passing through the center axis of the FRP core 2 are defined as division planes. It is divided in the diametrical direction of the cap 4 and is located at an intermediate portion of the cover 5 of the polymer insulator 1, that is, other than the P surface and the Q surface of the cover 5 located on the outer side in the axial direction of the upper and lower ends of the caps 4-1 and 4-2. A pair of molds 22- for forming parts
1 and 22-2. Here, the P surface of the jacket 5 is composed of a surface facing the outside of the cap 4-1 and the surface of the end 3-1 of the trunk 3, and the Q surface of the jacket 5 is The surface facing outward and the end 3 of the trunk 3
2 surface.

The molds 23-1, 23 constituting the first mold
-2, the end of the FRP core 2 is the core holding part 32-
1, 32-2, the surfaces facing the outside of the caps 4-1 and 4-2 at both ends, and the cavities 33-1 and 33- for forming the ends 3-1 and 3-2 of the body portion 3. And 2.
Each of the molds 22-1 and 22-2 constituting the second mold has a cap 4 other than a face facing the outside of caps 4-1 and 4-2 at both ends.
And a cavity 31 for forming the body 3 therebetween.
-1, 31-2. As shown in FIG. 2, two key grooves 24 are provided at the lower end corners of the dies 23-1 and 23-2 constituting the first die, respectively. Four keys 25 are provided at the lower end corners at both ends of one mold 22-2, and the keys 25 corresponding to the key grooves 24 are engaged to form the second mold of the FRP core 2. Positioning with respect to the molds 22-1 and 22-2 to be performed.

A method for manufacturing a polymer insulator using the above-configured mold for forming a polymer insulator of the present invention is as follows. First, the raw rubber 12 such as silicone rubber is placed around the FRP core 2, and the molds 23-1 and 23-2 constituting the first mold at predetermined positions on both ends of the FRP core 2.
Is set. In that state, FRP provided with raw rubber 12
The core 2 and the first mold are set on one of the second molds 22-2. Then, the other mold 22-1 of the second mold is pressed from above, and the rubber flows by the compressive force to fill the raw rubber 12 to every corner in the mold such as the cavities 31-1, 31-2. I do. And mold 22-
The compression molding is completed when the second key 25 is completely engaged with the key groove 24 of the molds 23-1 and 23-2. Finally,
By releasing the mold, as shown in FIG. 3, it is possible to obtain the polymer insulator 1 having the outer casing 5 including the body 3 and the cap 4 around the FRP core 2. Of course, then F
The metal fittings are fixed to both ends of the RP core 2 and used for actual use.

Therefore, when the polymer insulator is manufactured, the rubber flows out in the diametrical direction of the shade 4 from the divided surface of the second mold as in the conventional case, but unlike the conventional case, the second mold is not used. The outflow of the rubber from the split surface in the axial direction of the FRP core 2 can be completely eliminated by the first mold. Therefore, the outflow of the raw rubber in the axial direction of the FRP core 2, which is more outflow of the raw rubber than in the diameter direction of the cap, can be eliminated at the divided surface of the mold, and the raw rubber can be saved. Also, the dies 23-1, 23-23 constituting the first die
2 can be mounted on both ends of the FRP core 2 in advance and compression molding can be performed, so that the positioning of the FRP core 2 with respect to the dies 22-1 and 22-2 constituting the second die can be performed accurately and easily. be able to.

[0014]

As is apparent from the above description, according to the present invention, since the first molds at both end portions have no dividing surface, there is no flow of raw rubber at that portion during compression molding. Raw rubber can be saved. That is, in the conventional method, both ends have a degree of freedom in which the outflow direction of the rubber can freely flow not only in the radial direction but also in the axial direction. Therefore, the outflow amount in this portion is an amount calculated from a simple proportional number of caps. And a larger proportion of the runoff. Therefore, stopping the outflow of the raw rubber in this portion has a great effect of the raw rubber outflow. Also, FRP is applied to the first mold at both ends.
By mounting the core in advance, even when compression molding of raw rubber, F
The positioning of the RP core with respect to the mold can be performed accurately and easily.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a polymer insulator molding die of the present invention.

FIG. 2 is a perspective view showing an example of a mold part constituting the mold shown in FIG.

FIG. 3 is a perspective view showing an example of a polymer insulator manufactured using the mold of the present invention.

FIG. 4 is a diagram showing a configuration of an example of a conventional polymer insulator to which the present invention is applied.

FIG. 5 is a view showing one step of a conventional method for producing a polymer insulator.

FIG. 6 is a diagram showing a raw rubber outflow state in a conventional mold.

FIG. 7 is a view showing another step of the conventional method for producing a polymer insulator.

[Explanation of symbols]

1 Polymer insulator, 2 FRP core, 3 body, 3-
1, 3-2 end portion, 4 shade portion, 4-1 and 4-2 shade at both ends, 5 jacket, 6-1 and 6-2 bracket, 11-1, 11
-2, 21 Mold, 12 Raw rubber, 22-1, 22-2
Second mold, 23-1, 23-2 First mold, 31
-1,31-2,33-1,33-2 cavities, 3
2-1 and 32-2 core holder

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 31:00

Claims (2)

[Claims] 1. A polymer comprising a core, a body provided on the outer peripheral surface of the core, and a plurality of caps protruding from the body, wherein the body and the cap form a jacket. A mold used for molding an insulator, wherein a first part is divided in an axial direction of a core portion for molding outer end portions of a polymer insulator.
And a second mold that is divided in a diameter direction of a cap for forming an intermediate portion jacket of the polymer insulator. 2. A first mold which is divided in the axial direction of the core portion, wherein the outer peripheral position of the top end of the cap and the outer peripheral position of the bottom end of the lower end are set as dividing surfaces, respectively. A pair of dies for separately molding the portion of the jacket located on the outer side in the axial direction, and a second die for dividing in the diametrical direction of the cap, a surface passing through the central axis of the core portion as a division surface, The mold for molding a polymer insulator according to claim 1, comprising a pair of molds for molding a jacket of an intermediate portion other than the jackets located axially outside the caps at both ends.