JP7682426B1 - Manufacturing method of insulating cover - Google Patents

Abstract

The method for manufacturing an insulating cover according to the present disclosure includes the steps of creating a dip molding die by removably joining a plurality of partial dies, and manufacturing an insulating cover by dip molding using the dip molding die. Because the dip molding die is created by removably joining a plurality of partial dies, it is possible to create different insulating covers by replacing or rearranging parts of the partial dies, and since there is no need for a dedicated dip molding die for each insulating cover with a different shape, the manufacturing costs of the insulating cover can be reduced.

Description

The present disclosure relates to a method for manufacturing an insulating cover.

To prevent electric shock accidents caused by workers accidentally touching a conductor connection part to which a voltage is applied, an insulating cover is attached to the conductor connection part. One method for manufacturing such an insulating cover is to manufacture the insulating cover by dip molding using a mold created to match the inside dimensions of the insulating cover. For example, Patent Document 1 discloses an insulating cover manufactured by dip molding using insulating resin.

JP 63-141272 Publication

The inner shape of an insulating cover corresponds to the shape of the conductor connection part to which the insulating cover is attached, and the inner shape of an insulating cover manufactured by dip molding is determined by the shape of the mold used for dip molding. Therefore, in order to create insulating covers that correspond to conductor connection parts of different shapes, it is necessary to prepare molds of different shapes, which may increase manufacturing costs.

The present disclosure has been made to solve the above-mentioned problems and provides a method for manufacturing insulating covers that can reduce the manufacturing costs of insulating covers.

The manufacturing method of an insulating cover according to the present disclosure is a manufacturing method of an insulating cover to be attached to a conductor connection portion where a first conductor and a second conductor are connected by a fastening member, and includes the steps of creating a dip molding mold by removably combining a first partial mold having the same cross-sectional shape as the first conductor, a second partial mold having the same cross-sectional shape as the second conductor, and a third partial mold having the same shape as the fastening member, and manufacturing the insulating cover by dip molding using the dip molding mold.

The manufacturing method for insulating covers disclosed herein creates a dip molding die by removably joining multiple partial dies, making it possible to create different insulating covers by replacing or rearranging parts of the partial dies. This eliminates the need for a dedicated dip molding die for each insulating cover with a different shape, thereby reducing the manufacturing costs of the insulating covers.

11A and 11B are diagrams illustrating an example of a configuration of a conductor connection portion according to a comparative example. 6A and 6B are diagrams illustrating an example of the configuration of an insulating cover according to a comparative example. FIG. 1 is a diagram showing a configuration example of a dip-molding die according to a comparative example. 6A and 6B are diagrams illustrating an example of the configuration of an insulating cover according to a comparative example. FIG. 1 is a diagram showing a configuration example of a dip-molding die according to a comparative example. FIG. 2 is a cross-sectional view of a dip-molding die according to a comparative example. FIG. 2 is a diagram showing a configuration example of a partial mold according to the first embodiment; 1 is a diagram showing a configuration example of a dip molding die according to a first embodiment; 3A and 3B are diagrams illustrating an example of a configuration of an insulating cover according to the first embodiment. 13A to 13C are diagrams showing examples of configurations of a first partial mold, a second partial mold, and a third partial mold according to a second embodiment; FIG. 11 is a diagram showing a configuration example of a dip molding die according to a second embodiment. 13A and 13B are diagrams illustrating an example of a configuration of an insulating cover according to a second embodiment. FIG. 13 is a diagram showing a configuration example of a dip molding die according to a third embodiment. FIG. 11 is a cross-sectional view of a dip-molding die according to a third embodiment. FIG. 13 is a diagram showing an example of the configuration of a partial mold according to a fourth embodiment; FIG. 13 is a diagram showing a configuration example of a dip molding die according to a fourth embodiment.

The following describes the embodiments in detail with reference to the drawings. Note that the embodiments described below are merely examples. Furthermore, each embodiment can be implemented in appropriate combination.

Embodiment 1.
<Description of Comparative Example>
Before describing the method for manufacturing an insulating cover according to the first embodiment, a comparative example of a method for manufacturing an insulating cover will be described with reference to FIGS. 1 to 6. FIG.

The insulating cover 2 attached to the conductor connection part 1 will be described with reference to Figures 1 to 3. Figure 1 is a diagram showing an example of the configuration of the conductor connection part 1. The conductor connection part 1 is configured by connecting a first conductor 1a and a second conductor 1b with a fastening member 1c. Examples of the fastening member 1c include a bolt and a nut. Moreover, such a conductor connection part 1 is provided, for example, inside a switchboard.

Figure 2 is a diagram showing an example of the configuration of an insulating cover 2 attached to the conductor connection part 1. The insulating cover 2 shown in Figure 2 has irregularities and steps formed to match the shapes of the first conductor 1a, second conductor 1b, and fastening member 1c of the conductor connection part 1 shown in Figure 1. By attaching such an insulating cover 2 to the conductor connection part 1, the conductor connection part 1 is protected. To manufacture the insulating cover 2 shown in Figure 2, a dip molding die 3 shown in Figure 3 is used.

Next, a method for manufacturing the insulating cover 2a will be described with reference to Figures 4 to 6. Figure 4 shows an example of the insulating cover 2a, and Figure 5 shows an example of the dip molding die 3a. The insulating cover 2a shown in Figure 4 is manufactured by dip molding using the dip molding die 3a shown in Figure 5. Specifically, the dip molding die 3a shown in Figure 5 is preheated, and then immersed in the sol-like material of the insulating cover 2a to form a coating of the material of the insulating cover 2a on the surface of the dip molding die 3a. Here, examples of the material of the insulating cover 2a include synthetic resins. The dip molding die 3a is pulled out of the sol-like material of the insulating cover 2a, and the coating formed on the surface of the dip molding die 3a is heated and then cooled to solidify. The solidified coating of the insulating cover 2a is peeled off from the dip molding die 3a to become the insulating cover 2a.

Figure 6 is an A-A cross-sectional view of the dip molding die 3a shown in Figure 5, showing the state before the coating of the solidified insulating cover 2a is peeled off. As shown in Figure 6, the inside dimensions of the insulating cover 2a are determined by the dimensions of the dip molding die 3a, and the outside dimensions of the insulating cover 2a are determined by the dimensions of the dip molding die 3a and the thickness of the coating of the insulating cover 2a. Here, the thickness of the coating of the insulating cover 2a is determined by the preheat temperature of the dip molding die 3a and the viscosity of the sol-like insulating cover 2a material.

Thus, according to the manufacturing method of the insulating cover 2a in the comparative example, the shape of the insulating cover 2a was determined based on the dimensions of the dip molding die 3a and the thickness of the coating of the insulating cover 2a, so the inner dimensions of all insulating covers 2a manufactured from one dip molding die 3a were the same, and only the outer dimensions of the insulating cover 2a could be changed depending on the thickness of the coating of the insulating cover 2a.

Furthermore, in order to attach the insulating cover 2a to the conductor connection portion 1, the inside dimensions of the insulating cover 2a must correspond to the shape of the conductor connection portion 1. As described above, the inside dimensions of the insulating cover 2a are determined by the dimensions of the dip molding die 3a, so when manufacturing an insulating cover 2a to be attached to the conductor connection portion 1, it was necessary to prepare a dedicated dip molding die 3a that matches the shape of the conductor connection portion 1.

<Description of the embodiment>
Next, a method for manufacturing the insulating cover 12 according to this embodiment will be described with reference to Fig. 7 to Fig. 9. Fig. 7 shows an example of the configuration of partial molds 10a and 10b which are removably coupled together according to the first embodiment, Fig. 8 shows an example of the configuration of the dip molding mold 11, and Fig. 9 shows an example of the configuration of the insulating cover 12.

7, partial molds 10a and 10b have different shapes, partial mold 10a is a flat mold simulating the first conductor 1a or second conductor 1b of conductor connection part 1, and partial mold 10b is a cylindrical mold simulating fastening member 1c of conductor connection part 1. Note that partial molds 10a and 10b are not limited to these shapes, and may have any shape that allows insulating cover 12 formed by combined partial molds 10a and 10b to be attached to conductor connection part 1.

As shown in FIG. 8, a dip molding die 11 is created by removably connecting a plurality of partial dies 10a and 10b. In FIG. 8, two flat plate-shaped partial dies 10a are arranged so that they overlap with each other, and a cylindrical partial die 10b is arranged on top of them to create a dip molding die 11. However, the number, shape and arrangement of the partial dies 10a and 10b are not limited to these, and the number, shape and arrangement of the partial dies 10a and 10b may be set to match the dip molding die 11 corresponding to the shape of the insulating cover 12 to be created. In addition, the partial dies 10a and 10b may be fixed in any way as long as they are fixed so as not to shift during dip molding and are removable after dip molding. For example, the partial dies 10a and 10b may be fixed by screws, or as described in embodiment 4, the partial dies 10a and 10b may be fixed by magnetic force.

Next, the insulating cover 12 shown in FIG. 9 is manufactured by dip molding using the dip molding die 11 shown in FIG. 8. Specifically, the dip molding die 11 is immersed in the sol-like material of the insulating cover 12 to form a coating on the surface of the dip molding die 11, and the coating formed on the surface of the dip molding die 11 pulled out of the sol-like material of the insulating cover 12 is heated and then cooled to solidify. The solidified coating of the insulating cover 12 is peeled off from the dip molding die 11 to form the insulating cover 12. Here, since the dip molding die 11 is created by removably connecting a plurality of partial dies 10a, 10b, it is necessary to be careful not to loosen the connection between the partial dies 10a, 10b and change the arrangement of the partial dies 10a, 10b before the coating formed on the surface of the dip molding die 11 solidifies.

According to this method for manufacturing the insulating cover 12, the shape of the dip molding die 11 is determined by the number, shape and arrangement of the partial dies 10a and 10b, and the shape of the insulating cover 12 is determined based on the shape of the dip molding die 11 and the thickness of the insulating cover 12. Since the inner dimensions of the insulating cover 12 are determined by the dimensions of the dip molding die 11, the inner dimensions of the insulating cover 12 can be changed by changing at least one of the number, shape and arrangement of the partial dies 10a and 10b. Therefore, since the dip molding die 11 corresponding to insulating covers 12 of multiple shapes can be created using limited partial dies 10a and 10b, it is not necessary to prepare a dedicated dip molding die 11 for each insulating cover 12 of different shapes, and the manufacturing cost of the insulating cover 12 can be reduced.

As described above, the method for manufacturing an insulating cover according to the first embodiment includes a step of creating a dip molding die 11 by removably connecting a plurality of partial dies 10a, 10b, and a step of manufacturing an insulating cover 12 by dip molding using the dip molding die 11. With this configuration, it is possible to create dip molding dies 11 of different shapes by replacing or rearranging parts of the partial dies 10a, 10b, and to manufacture insulating covers 12 of different shapes. As a result, a dedicated dip molding die 11 is not required for each insulating cover 12 of a different shape, and the manufacturing cost of the insulating cover 12 can be reduced.

Embodiment 2.
A method for manufacturing an insulating cover according to a second embodiment will be described with reference to Fig. 10 to Fig. 12. In the second embodiment, the configuration different from the first embodiment will be mainly described.

Figure 10 shows an example of the configuration of a first partial mold 20a, a second partial mold 20b, and a third partial mold 20c that are removably coupled according to embodiment 2, Figure 11 shows an example of the configuration of dip molding molds 21a, 21b, and 21c according to embodiment 2, and Figure 12 shows an example of the configuration of insulating covers 22a, 22b, and 22c according to embodiment 2. In embodiment 2, the dip molding molds 21a, 21b, and 21c are composed of a first partial mold 20a, a second partial mold 20b, and a third partial mold 20c.

The first partial mold 20a has the same cross-sectional shape as the first conductor 1a of the conductor connection part 1, the second partial mold 20b has the same cross-sectional shape as the second conductor 1b of the conductor connection part 1, and the third partial mold 20c has the same shape as the fastening member 1c of the conductor connection part 1. Here, since it is sufficient to attach an insulating cover to a part of the first conductor 1a and the second conductor 1b rather than attaching an insulating cover so as to cover the entire first conductor 1a and the second conductor 1b, the first partial mold 20a has the same cross-sectional shape as the first conductor 1a, and the second partial mold 20b has the same cross-sectional shape as the second conductor 1b. In addition, since the fastening member 1c is entirely covered by the insulating cover, the third partial mold 20c has the same shape as the fastening member 1c. Note that the "same shape" or "same cross-sectional shape" mentioned here does not have to be exactly the same, and may be slightly larger to allow room for attaching the insulating cover, for example. In other words, the first partial mold 20a, the second partial mold 20b and the third partial mold 20c may have any shape that allows the insulating covers 22a, 22b, 22c formed by the first partial mold 20a, the second partial mold 20b and the third partial mold 20c to be attached to the conductor connection portion.

As shown in Figure 11, the dip molding dies 21a, 21b, 21c are created by removably connecting the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c. The dip molding dies 21a, 21b, 21c, which are composed of the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c, each have the same shape as the conductor connection part. In this way, by changing the number and arrangement of the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c, it is possible to create dip molding dies 21a, 21b, 21c having the same shapes as the conductor connection parts of multiple shapes.

Next, the insulating covers 22a, 22b, and 22c shown in FIG. 12 are manufactured by dip molding using the dip molding dies 21a, 21b, and 21c. Specifically, the dip molding dies 21a, 21b, and 21c are immersed in the sol-like material of the insulating covers 22a, 22b, and 22c to form a coating on the surface of the dip molding dies 21a, 21b, and 21c, and the coating formed on the surface of the dip molding dies 21a, 21b, and 21c pulled out of the sol-like material of the insulating covers 22a, 22b, and 22c is heated and then cooled to solidify. The solidified coating of the insulating covers 22a, 22b, and 22c is peeled off from the dip molding dies 21a, 21b, and 21c to form the insulating covers 22a, 22b, and 22c. Here, the insulating cover 22a is manufactured using a dip molding die 21a, the insulating cover 22b is manufactured using a dip molding die 21b, and the insulating cover 22c is manufactured using a dip molding die 21c.

In this way, by using the first partial mold 20a having the same cross-sectional shape as the first conductor 1a of the conductor connection part 1, the second partial mold 20b having the same cross-sectional shape as the second conductor 1b of the conductor connection part 1, and the third partial mold 20c having the same shape as the fastening member 1c of the conductor connection part 1, dip molding dies 21a, 21b, 21c for each conductor connection part with a different shape can be made, and insulating covers 22a, 22b, 22c for each conductor connection part with a different shape can be manufactured. Therefore, since the dip molding dies 21a, 21b, 21c corresponding to conductor connection parts of a plurality of shapes can be created using the limited first partial mold 20a, second partial mold 20b, and third partial mold 20c, it is not necessary to prepare dedicated dip molding dies 21a, 21b, 21c for each insulating cover 22a, 22b, 22c corresponding to conductor connection parts of different shapes, and the manufacturing cost of the insulating covers 22a, 22b, 22c can be suppressed.

As described above, the manufacturing method of the insulating cover according to the second embodiment includes a step of creating dip molding dies 21a, 21b, 21c by removably combining a first partial die 20a having the same cross-sectional shape as the first conductor 1a of the conductor connection portion 1, a second partial die 20b having the same cross-sectional shape as the second conductor 1b of the conductor connection portion 1, and a third partial die 20c having the same shape as the fastening member 1c of the conductor connection portion 1, and a step of manufacturing the insulating covers 22a, 22b, 22c by dip molding using the dip molding dies 21a, 21b, 21c. According to this configuration, the first partial mold 20a has the same cross-sectional shape as the first conductor 1a, the second partial mold 20b has the same cross-sectional shape as the second conductor 1b, and the third partial mold 20c has the same shape as the fastening member 1c, so that by changing at least one of the number and arrangement of the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c, it is possible to manufacture insulating covers 22a, 22b, and 22c corresponding to conductor connection parts of different shapes. As a result, it is not necessary to provide dedicated dip molding dies 21a, 21b, and 21c for each of the insulating covers 22a, 22b, and 22c having different shapes, and the manufacturing cost of the insulating covers 22a, 22b, and 22c can be reduced.

Furthermore, in the second embodiment, the first partial mold 20a having the same cross-sectional shape as the first conductor 1a, the second partial mold 20b having the same cross-sectional shape as the second conductor 1b, and the third partial mold 20c having the same shape as the fastening member 1c are used to create dip molding dies 21a, 21b, and 21c corresponding to each conductor connection part of different shapes. With this configuration, dip molding dies 21a, 21b, and 21c corresponding to conductor connection parts of multiple shapes can be created using only the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c. As a result, when manufacturing insulating covers 22a, 22b, and 22c to be attached to conductor connection parts of different shapes, it is not necessary to prepare partial molds of new shapes, and the manufacturing cost of the insulating covers 22a, 22b, and 22c can be further reduced.

Embodiment 3.
A method for manufacturing an insulating cover according to a third embodiment will be described with reference to Fig. 13 and Fig. 14. In the third embodiment, the configuration different from the first and second embodiments will be mainly described.

Figure 13 shows an example of the configuration of a dip molding die 31 to be joined according to embodiment 3, and Figure 14 is a B-B cross-sectional view of the dip molding die 31 shown in Figure 13. In embodiment 3, the dip molding die 31 is composed of a fourth part die 30a, a fifth part die 30b, a sixth part die 30c, and a screw 32. Note that in this embodiment, a countersunk head screw is used as an example of the screw 32, but the screw is not limited to a countersunk head screw and other types of screws may be used as long as they can join the fourth part die 30a, the fifth part die 30b, and the sixth part die 30c.

14, the fourth part mold 30a, the fifth part mold 30b, and the sixth part mold 30c are molds in which different types of holes are formed. The fourth part mold 30a is formed with a screw head hole, which is a conical countersink hole into which the head of the screw 32 fits, the fifth part mold 30b is formed with a screw hole that engages with the threaded portion of the screw 32, and the sixth part mold 30c is formed with a through hole through which the screw 32 can pass.

13 and 14, the sixth part mold 30c is placed between the fourth part mold 30a and the fifth part mold 30b, and the screws 32 are placed so as to pass through holes formed in the fourth part mold 30a, the fifth part mold 30b, and the sixth part mold 30c, and the fourth part mold 30a, the fifth part mold 30b, and the sixth part mold 30c are joined by the screws 32 to create a dip molding mold 31. Depending on the shapes of the fourth part mold 30a, the fifth part mold 30b, the sixth part mold 30c, the screws 32, and the dip molding mold 31, the dip molding mold 31 may be created using the fourth part mold 30a, the fifth part mold 30b, and the screws 32 without using the sixth part mold 30c.

Next, the insulating cover is manufactured by dip molding using a dip molding die 31. Specifically, the dip molding die 31 is immersed in a sol-like insulating cover material to form a coating on the surface of the dip molding die 31, and the coating formed on the surface of the dip molding die 31 that is pulled out of the sol-like insulating cover material is heated and then cooled to solidify. The solidified insulating cover coating is peeled off from the dip molding die 31 to form the insulating cover.

In this way, by arranging the fourth part mold 30a, the fifth part mold 30b, the sixth part mold 30c and the screw 32 so that the head of the screw 32 fits into the screw head hole of the fourth part mold 30a, it is possible to prevent the head from protruding like a bolt on the end face of the dip molding mold 31. Therefore, the shape of the head of the screw 32 does not affect the outer shape of the dip molding mold 31, and an insulating cover without unnecessary unevenness can be manufactured, preventing the insulating cover from becoming difficult to attach. Here, it is considered that the cross-shaped groove or hole formed in the head of the screw 32 affects the shape of the insulating cover manufactured by the dip molding mold 31. However, the unevenness due to the groove or hole formed in the head of such a screw 32 is small, and the shape of the insulating cover does not change much, so the effect on the ease of attaching the insulating cover can be ignored.

Furthermore, since the dip molding die 31 is created by combining the fourth partial mold 30a, the fifth partial mold 30b, and the sixth partial mold 30c and connecting them with the screws 32, after the insulating cover is manufactured using the dip molding die 31, the screws 32 can be removed to return the fourth partial mold 30a, the fifth partial mold 30b, and the sixth partial mold 30c to their previous state before being combined. Therefore, after the insulating cover is manufactured using the dip molding die 31, the number and arrangement of the fourth partial mold 30a, the fifth partial mold 30b, and the sixth partial mold 30c and the length of the screws 32 can be changed to manufacture a new insulating cover of a different shape. Therefore, since the fourth partial mold 30a, the fifth partial mold 30b, and the sixth partial mold 30c can be used repeatedly, insulating covers of different shapes can be manufactured without preparing new partial molds, and the manufacturing cost of the insulating cover can be suppressed.

The above-mentioned fourth part mold 30a and fifth part mold 30b are joined with a screw 32 in the case of using the first part mold 20a, the second part mold 20b, and the third part mold 20c described in the second embodiment. The third part mold, which has the same shape as the fastening member 1c, is a screw. In addition, the first part mold has a screw head hole in which the head of the screw, which is the third part mold, fits, and the second part mold has a screw hole in which the threaded portion of the screw, which is the third part mold, engages. The first part mold and the second part mold are overlapped, and the screw is placed so that it passes through the screw head hole of the first part mold and the screw hole of the second part mold, and the first part mold and the second part mold are joined by the screw to create a dip molding mold. An insulating cover is created by dip molding using this dip molding mold.

In this way, by connecting the first partial mold having the same cross-sectional shape as the first conductor 1a and the second partial mold having the same cross-sectional shape as the second conductor 1b with screws, it is possible to manufacture an insulating cover to be attached to a conductor connection part formed so that the shape of the fastening member does not protrude from the conductor. Furthermore, since the screws can be removed and the first partial mold, the second partial mold, and the screws can be used repeatedly, it is possible to manufacture insulating covers to be attached to conductor connection parts of multiple shapes by changing the shapes and arrangement of the first partial mold and the second partial mold and the length of the screws, and it is no longer necessary to prepare a dedicated dip molding mold for each shape of the conductor connection part, thereby reducing the manufacturing cost of the insulating cover.

As described above, the method for manufacturing an insulating cover according to the third embodiment includes a step of creating a dip molding die 31 by connecting a fourth part mold 30a having a screw head hole in which the head of the screw 32 fits and a fifth part mold 30b having a screw hole in which the threaded portion of the screw 32 fits with the screw 32, and a step of manufacturing an insulating cover by dip molding using the dip molding die 31. According to this configuration, a dip molding die 31 in which the head of the screw 32 fits into the screw head hole of the fourth part mold 30a is created, and the head of the screw 32 can be prevented from protruding from the end face of the dip molding die 31. As a result, unnecessary irregularities are not formed in the shape of the insulating cover manufactured by the dip molding die 31, and it is possible to prevent the insulating cover from becoming difficult to attach to the conductor connection part 1.

Furthermore, in the third embodiment, the sixth part mold 30c having a through hole for the screw 32 is arranged between the fourth part mold 30a and the fifth part mold 30b, and the fourth part mold 30a, the fifth part mold 30b, and the sixth part mold 30c are joined with the screw 32 to create a dip molding mold 31, and a step of manufacturing an insulating cover by dip molding using the dip molding mold 31. According to this configuration, the shape of the dip molding mold 31 can be changed by changing the number of the sixth part mold 30c and the length of the screw 32 according to the shape of the insulating cover to be manufactured. As a result, a dedicated dip molding mold 31 is not required for each insulating cover having a different shape, and the manufacturing cost of the insulating cover can be reduced.

Furthermore, in the third embodiment, the fourth partial mold 30a, the fifth partial mold 30b, and the sixth partial mold 30c are joined with the screw 32 to create the dip molding mold 31. With this configuration, after the insulating cover is manufactured using the dip molding mold 31, the fourth partial mold 30a, the fifth partial mold 30b, the sixth partial mold 30c, and the screw 32 that constitute the dip molding mold 31 can be disassembled. As a result, the fourth partial mold 30a, the fifth partial mold 30b, and the sixth partial mold 30c can be used repeatedly, so that insulating covers of different shapes can be manufactured without preparing new partial molds, thereby reducing the manufacturing cost of the insulating cover.

Furthermore, in the third embodiment, the method includes a step of creating a dip molding die by connecting a first partial die having the same cross-sectional shape as the first conductor 1a, in which a screw head hole for receiving the head of the screw is formed, and a second partial die having the same cross-sectional shape as the second conductor 1b, in which a screw hole for engaging with the threaded portion of the screw is formed, with a screw, and a step of manufacturing an insulating cover by dip molding using the dip molding die. According to this configuration, a dip molding die in which the head of the screw does not protrude from the surface of the first partial die and the second partial die having the same cross-sectional shape as the first conductor 1a can be created. Therefore, even when manufacturing an insulating cover to be attached to a conductor connection part formed so that the shape of the fastening member does not protrude from the conductor, it is possible to manufacture insulating covers to be attached to conductor connection parts of a plurality of shapes by changing the shape and arrangement of the first partial die and the second partial die and the length of the screw according to the shape of the insulating cover to be manufactured. As a result, it is no longer necessary to prepare a dedicated dip molding die for each shape of the conductor connection part, and the manufacturing cost of the insulating cover can be reduced.

Embodiment 4.
A method for manufacturing an insulating cover according to a fourth embodiment will be described with reference to Fig. 15 and Fig. 16. In the fourth embodiment, the configuration different from the first to third embodiments will be mainly described.

Figure 15 shows an example of the configuration of the joined partial molds 40a and 40b according to embodiment 4, and Figure 16 shows an example of the configuration of the dip molding mold 41 according to embodiment 4. In embodiment 3, the dip molding mold 41 is composed of partial molds 40a and 40b.

The partial mold 40a shown in FIG. 15 is a mold made of a ferromagnetic material, and the partial mold 40b is a mold made of a magnet. By arranging the partial molds 40a and 40b as shown in FIG. 16, a dip molding mold 41 is created. Here, by arranging the partial molds 40a and 40b, the partial molds 40a and 40b are removably connected by the magnetic force of the magnet of the partial mold 40b. Note that the materials constituting the partial molds 40a and 40b are not limited to these, and it is sufficient that at least one of the partial molds 40a and 40b has a magnet and the partial molds 40a and 40b are connected by magnetic force. For example, the partial mold 40b may not be a mold made of a magnet, but may be a mold made of a ferromagnetic material with a magnet embedded therein. Also, for example, the partial mold 40a may be a mold made of a magnet, and the partial mold 40b may be a mold made of a ferromagnetic material.

Next, the insulating cover is manufactured by dip molding using a dip molding die 41. Specifically, the dip molding die 41 is immersed in a sol-like insulating cover material to form a coating on the surface of the dip molding die 41, and the coating formed on the surface of the dip molding die 41 that is pulled out of the sol-like insulating cover material is heated and then cooled to solidify. The solidified insulating cover coating is peeled off from the dip molding die 41 to form the insulating cover.

In this way, because the partial molds 40a, 40b are connected by magnetic force, a separate fastening member for connecting the partial molds 40a, 40b is not required, and the outer shape of the dip molding mold 41 is not affected by the fastening member. Therefore, the outer shape of the dip molding mold 41 is determined by the partial molds 40a, 40b, and an insulating cover without unnecessary irregularities can be manufactured, preventing the insulating cover from becoming difficult to attach to the conductor connection portion 1.

Furthermore, when creating the dip molding die 41, it is only necessary to position the partial dies 40a, 40b, as the partial dies 40a, 40b are connected by magnetic force, eliminating the need to connect the partial dies 40a, 40b with fastening members, and the dip molding die 41 can be easily created.

Furthermore, because the partial molds 40a and 40b are removably joined by magnetic force, after an insulating cover is manufactured using the dip molding mold 41, the partial molds 40a and 40b can be separated and returned to the state before they were combined. Therefore, after an insulating cover is manufactured using the dip molding mold 41, the number and arrangement of the partial molds 40a and 40b can be changed to manufacture a new insulating cover of a different shape. Therefore, because the partial molds 40a and 40b can be used repeatedly, insulating covers of different shapes can be manufactured without preparing new partial molds, and the manufacturing cost of the insulating cover can be reduced.

Furthermore, the above-mentioned partial molds 40a and 40b may be joined by magnetic force when the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c described in the second embodiment are used. For example, if the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c are made of ferromagnetic material and at least one of them is equipped with a magnet, the ferromagnetic material is magnetized in a chain manner when the magnet is brought close, so that the joined state shown in FIG. 11 can also be realized. In this way, the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c are removably joined by magnetic force. Therefore, by changing at least one of the number and arrangement of the first partial mold 20a, the second partial mold 20b, and the third partial mold 20c, it is possible to manufacture insulating covers corresponding to conductor connection parts of different shapes.

As described above, the method for manufacturing an insulating cover according to the fourth embodiment includes a step of creating a dip molding die 41 by connecting a plurality of partial dies 40a, 40b by magnetic force, and a step of manufacturing an insulating cover by dip molding using the dip molding die 41. According to this configuration, the plurality of partial dies 40a, 40b are connected by magnetic force, so that a separate fastening member for connecting the partial dies 40a, 40b is not required. As a result, the outer shape of the dip molding die 41 is determined by the partial dies 40a, 40b, and unnecessary irregularities are not formed in the shape of the insulating cover manufactured by the dip molding die 41, so that it is possible to prevent the insulating cover from being difficult to attach to the conductor connection portion 1.

Furthermore, in the fourth embodiment, the dip molding die 41 is created by combining a partial die 40a made of a ferromagnetic material with a partial die 40b equipped with a magnet. With this configuration, once the partial dies 40a and 40b are positioned, the partial dies 40a and 40b are joined by magnetic force, and the dip molding die 41 can be created. As a result, the task of joining the partial dies 40a and 40b with fastening members is no longer necessary, and the dip molding die 41 can be easily created.

Furthermore, in the fourth embodiment, the dip molding die 41 is created by joining a plurality of partial dies 40a, 40b together using magnetic force. With this configuration, after an insulating cover is manufactured using the dip molding die 41, the partial dies 40a, 40b that constitute the dip molding die 41 can be disassembled. As a result, the partial dies 40a, 40b can be used repeatedly, so that insulating covers of different shapes can be manufactured without preparing new partial dies, thereby reducing the manufacturing costs of the insulating covers.

Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in this specification, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment.

1 Conductor connection part, 1a First conductor, 1b Second conductor, 1c Fastening member, 2, 2a Insulating cover, 3, 3a Dip molding die, 10a, 10b Partial die, 11 Dip molding die, 12 Insulating cover, 20a First partial die, 20b Second partial die, 20c Third partial die, 21a, 21b, 21c Dip molding die, 22a, 22b, 22c Insulating cover, 30a Fourth partial die, 30b Fifth partial die, 30c Sixth partial die, 31 Dip molding die, 32 Screw, 40a, 40b Partial die, 41 Dip molding die

Claims (5)

A method for manufacturing an insulating cover to be attached to a conductor connection part in which a first conductor and a second conductor are connected by a fastening member, comprising the steps of:
creating a dip molding die by removably coupling a first partial die having the same cross-sectional shape as the first conductor, a second partial die having the same cross-sectional shape as the second conductor, and a third partial die having the same shape as the fastening member;
and producing an insulating cover by dip molding using the dip molding die. A step of creating a dip molding die by connecting a fourth partial die having a screw head hole into which a head of a screw is inserted and a fifth partial die having a screw hole that engages with a threaded portion of the screw with the screw;
and producing an insulating cover by dip molding using the dip molding die. 3. The method for manufacturing an insulating cover according to claim 2, wherein the step of creating the dip molding die comprises placing a sixth part die having a through hole for the screw between the fourth part die and the fifth part die, and creating the dip molding die by connecting the fourth part die, the fifth part die, and the sixth part die with the screw . The third part mold is a screw;
The first partial mold has a screw head hole in which the head of the screw is inserted,
The second partial mold has a screw hole that engages with the threaded portion of the screw,
2. The method for manufacturing an insulating cover according to claim 1 , wherein the step of preparing the dip molding die comprises coupling the first and second partial dies together with the screws . 2. The method for manufacturing an insulating cover according to claim 1 , wherein the step of preparing the dip molding die comprises coupling the first partial die, the second partial die and the third partial die by magnetic force .

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