JPH06119834A - Manufacture of enameled wire and device thereof - Google Patents

Abstract

PURPOSE:To proved the manufacturing method for an enameled wire, having uniform quality in a longitudinal direction (finished outer diameter and appearance in particular), and a device thereof. CONSTITUTION:Shielding plates 5, composed of steel plates nipping a heat insulating material having heat resistance such as glass wool, are provided between a coating tank 11 and a baking furnace 6. The coating tank 11 is composed of a shielding plate same as mentioned above, is covered by an upper part shielding plate 4 having a ventilating hole 7, and the shielding plate 4 is detachable. In this constitution, heat, radiated from the inlet of the baking furnace 6, is shielded by the shielding plate 5 to prevent the drying of felt 8 and also the drying of felt 8 and also the temperature change of the coating 2 of the coating tank 11. The coating tank 11 is coated by material having high heat insulation, and is coated by the shielding plate 4 at the upper part, keeping the temperature of the coating 2 at constantly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enameled wire manufacturing method and apparatus for manufacturing high quality enameled wire by a felt method.

[0002]

2. Description of the Related Art FIG. 3 is a partial perspective view showing an example of an apparatus for manufacturing an enameled wire of this type of conventional structure.

The paint tank 11 is located near the entrance of the baking oven 6 (30 cm
˜1 m), the paint tank is mainly composed of a steel plate paint tank, and the upper part is open. Therefore, in the conventional apparatus, the heat of the baking furnace was directly radiated (for example, No. 59-74617, No. 59-20869, No. 60-267, No. 60-267).
(See each publication of No. 31).

Further, in an example of the coating apparatus of this type disclosed in FIG. 2, the temperature of the coating tank is changed by coating the space between the baking furnace 6 and the coating tank 11 with a heat resistant material such as a steel plate. Has been devised to keep it rather high and constant.

Further, conventionally, the viscosity of the coating material also changes due to the difference in outside air temperature between summer and winter, which has been a cause of variations in quality. However, recently, due to the sophistication of the quality required by customers,
Enamel wire is now manufactured in air-conditioned rooms and clean rooms. Especially for ultra-fine enameled wire, the required quality is high and sub-micron dimensional accuracy is required. According to the results of the investigation conducted so far, it has been found that the temperature fluctuation in the baking oven affects the paint temperature in the paint tank and is one of the factors that cause the finished outer diameter to fluctuate.

[0006]

However, in the apparatus shown in FIG. 3, (1) the paint tank is installed near the entrance of the baking furnace, and there is no shielding plate between them, so that the paint tank can prevent the temperature fluctuation of the baking furnace temperature. Directly affected.

(2) A change in the baking oven temperature causes a change in the temperature of the paint in the paint tank, that is, a change in the viscosity, which is one of the causes of variations in the finished outer diameter in the longitudinal direction of the enameled wire.

(3) Especially when a wire break occurs in the baking furnace,
The temperature distribution inside the baking furnace is disturbed, and as a result, the finished outer diameter of the enamel wire changes rapidly.

(4) A sheet heater is attached to the bottom surface of the conventional paint tank in order to keep the temperature of the paint in the paint tank constant.
It was unsuitable.

The apparatus of FIG. 2 is intended to keep the paint temperature constant by utilizing the baking oven temperature, but the problems (2) and (3) of the apparatus of FIG. 3 are exactly the same. We were unable to avoid fluctuations in the paint temperature, causing fluctuations in the finished outer diameter of the enamel wire.

An object of the present invention is to solve the problems of the prior art and to provide a method and an apparatus for producing an enameled wire having uniform quality in the longitudinal direction (particularly, finished outer diameter and appearance).

[0012]

The gist of the present invention resides in that a shielding plate having heat resistance and heat insulation is provided between the baking oven inlet and the paint tank, and the coating device is covered. The viscosity of the paint is stabilized and the quality in the longitudinal direction is stabilized.

That is, the above object of the present invention is to apply the enamel coating in a method for producing an enamel wire in which the enamel coating is applied to the filament and the filament coated with the enamel coating is baked in a baking oven. A method for producing an enamel wire, characterized in that the bath is thermally shut off from a baking oven, and evaporation is also applied from the enamel paint in the paint bath. Alternatively, in an enamel wire manufacturing apparatus having an enamel coating tank and a baking furnace, a shielding plate in which a material having excellent heat resistance and heat insulation is sandwiched by heat resistant materials is provided between the baking furnace and the coating tank. Further, the present invention is achieved by an apparatus for producing an enameled wire, characterized in that the entire coating tank is covered with the same shielding plate as described above.

In the present invention, the fact that the bath for applying the enamel paint is thermally shut off from the baking oven is considered to prevent radiant heat from the high temperature baking oven. For that purpose, for example, glass wool, rock wool or the like can be used as a material having excellent heat resistance and heat insulation. Further, as the heat resistant material, iron, aluminum, steel plate or the like is used.

Since radiant heat, convective heat, etc. are the most common heat transfer from the baking oven, the shield plate is made by inserting glass wool between iron plates between the baking oven and the paint tank for thermal insulation. It is necessary to prevent the direct radiant heat from the baking furnace at least. It is preferable to open only the passage of the filamentous body and separate it by a wall.

Further, in the present invention, the application of the enamel paint in the paint tank while also suppressing the evaporation causes a large latent heat to be lost by the evaporation, which has a great influence on the change of the paint liquid temperature. Especially when the baking oven and the paint tank are in one chamber, the temperature change at room temperature is large, and especially when the paint tank is open, the evaporation rate changes, which causes the temperature change and viscosity change of the paint. , The amount of paint applied to the filaments varies, and the applied thickness varies. Therefore, it is desirable to keep the temperature of the paint in the paint tank constant by surrounding the entire paint tank with the same shielding plate as described above. In the present invention, the same as the above means that another substance may be used as long as it has the same function.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side sectional view of an embodiment of an apparatus for realizing a baking coating method according to the present invention. After applying the paint 2 to the filaments 3, the felt 9 is squeezed with the weight 8
In the manufacturing apparatus for baking in the baking oven 6, in the present invention, a shielding plate 5 composed of steel plates sandwiching a heat-resistant heat insulating material such as glass wool is provided between the paint tank 11 and the baking oven 6. .

The paint tank 11 is composed of a shield plate similar to that described above, and is covered with an upper shield plate 4 having a ventilation hole 7, and the shield plate 4 is removable.

In the apparatus according to the present invention configured as described above, the heat radiated from the inlet of the baking furnace 6 is shielded by the shield plate 5.
The felt 8 is shielded by and is prevented from drying, and at the same time, the temperature change of the paint 2 in the paint tank 11 is prevented. Further, since the paint tank 11 is made of a material having a high heat insulating property and the upper part is also covered with the shielding plate 4, the temperature of the paint 2 can be kept constant. By stabilizing the characteristics of the paint thereby,
It is possible to manufacture a high-quality enameled wire having a uniform outer diameter over the entire length in the longitudinal direction.

[0020]

【The invention's effect】

(1) It is possible to suppress the temperature change in the paint tank, that is, the viscosity change caused by the fluctuation of the furnace temperature.

(2) Prevent the squeezing felt from drying.
(The varnish properties of the felt can be stabilized.) Therefore, it is possible to manufacture enameled wire with uniform quality (especially finished outer diameter and appearance) in the longitudinal direction from (1) and (2).

Especially, when a disconnection or the like occurs in the furnace, the change in the furnace temperature is large, but it is possible to suppress the variation in the finished outer diameter due to this influence.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a manufacturing apparatus of the present invention.

FIG. 2 is a partial perspective view of a coating portion of an example of a conventional manufacturing apparatus.

FIG. 3 is a partial perspective view of another example of a conventional manufacturing apparatus.

[Explanation of symbols]

 1 roll 2 paint 3 filament body 4 upper shielding plate 5 shielding plate 6 baking furnace 7 ventilation hole 8 weight 9 felt 10 weight 11 paint tank

Claims (2)

[Claims] 1. A method for producing an enamel wire, wherein a filament is coated with an enamel paint and the filament coated with the enamel paint is baked in a baking oven. The method for producing an enamel wire, characterized in that the coating is carried out by shutting off the coating and suppressing evaporation from the enamel coating in the coating tank. 2. An enamel wire manufacturing apparatus having an enamel coating tank and a baking furnace, wherein a baking furnace and the coating tank are provided between the baking furnace and the coating tank.
An enamel wire manufacturing apparatus comprising a shield plate sandwiching a material having excellent heat resistance and heat insulation between heat resistant materials, and further enclosing the entire enamel coating tank with a shield plate similar to the above.