JPS6111420B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for applying an insulating coating to a member that needs to be electrically insulated from other members, such as a spindle for supporting a brush in a rotating electrical machine.

When an insulating coating is applied to a member to be attached to another member as described above, the insulating coating on the surface of the mounting part of this member that joins with the other member must have a flat surface to ensure mechanical precision during installation. However, unless the insulating coating is formed by molding, simply applying the insulating coating to the component using fluidized dip coating or spray painting will not result in the thickness of the insulating coating being uniform. It is difficult to form a flat surface with a uniform thickness;
A drawback was that it was difficult to ensure mechanical precision when attaching the members.

In order to eliminate the above-mentioned drawbacks, the present invention provides a method for applying an insulating coating that can form an insulating coating with a flat surface and a uniform thickness on the mounting surface of a member in a simple manner. The purpose is to provide.

In order to achieve the above-mentioned object, this invention heats a member having an insulating film formed by coating a thermofusible insulator on the surface at a temperature that softens the insulating film, and then the insulating film of the member is heated to a temperature that softens the insulating film. The surface on which the thickness should be made uniform is mounted across the plurality of ridges on the surface of a flat molding jig, which has a plurality of ridges of a predetermined height and is coated with a mold release agent. After forming an insulating coating by pressing the member against the jig until the protrusions contact the base of the member, the insulating film is applied to the recesses formed in the insulating coating by the protrusions of the jig. It is constructed by filling a putty-like insulating material of the same type as the product and curing the insulating coating.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show a brush support spindle of a rotating electrical machine on which an insulating coating is formed by the insulating coating coating method according to the present invention, and a state in which the insulating coating is formed on the mounting surface of the mounting portion of this spindle. It is something. The spindle (member) 1 in these figures has a T-shaped cross section, and an insulating coating 3 is formed on the entire surface except for the part 2 where the brush holder is attached by applying a thermofusible insulating material by a fluidized dip coating method or the like. has been done. In order to form the insulating coating 3 on the surface of the spindle 1 by the fluidized dip coating method,
First, after cleaning the spindle 1, the part 2 where the brush holder is attached is masked with asbestos paper 4 and glass adhesive tape 5, and then the masked spindle 1 is heated in a heating furnace to a temperature higher than the melting point of the adhered insulator. After that, put it in the deposition tank. Air is sent into this deposition tank, and heat-soluble synthetic resin powder such as epoxy resin is poured into the tank, for example,
The spindle 1 is adjusted to float at a height of ~4 mm and maintain a fluid state, and the spindle 1 is oscillated about 15 times for about 15 seconds in this tank, using part 2 of the spindle 1 as a fulcrum. The insulating coating 3 is formed by melting and adhering the powdered resin insulating material to the surface. The fluidized dip coating method is useful because a thicker coating film can be obtained than a coating method using a solvent-based paint, and the thickness of the coating film obtained by coating under the above conditions is about 1 mm. After the fluidized dip coating has been completed, the spindle 1 is cooled to room temperature and inspected for the presence or absence of thickness sag in the coating film, and then reheated to a temperature at which the insulating coating 3 is softened. On the other hand, a molding device 9 is used for molding the insulating coating 3 on the mounting surface (face) 8 of the mounting portion 7 to which the spindle 1 is joined and mounted to the support portion 6 of the rotating electrical machine to a flat surface and uniform thickness. A forming jig 1 comprising a plurality of protrusions 10 of a predetermined height on a flat plate and made of metal such as Shinchiyu.
1 is housed in a pot-shaped protrusion 13 placed on a heater 12. The height of the protrusion 10 of the molding jig 11 is slightly larger than the thickness of the insulating coating 3 of the spindle 1, and the heater 12 is arranged so that the surface temperature of the jig 11 can be adjusted. The jig 11 of the molding device 9 is adjusted and heated so that its surface temperature is, for example, 70 to 80°C.
After applying a mold release agent such as oil to the surface of jig 11
The spindle 1 is mounted on the surface of the spindle 1 so that the mounting surface 8 of the mounting portion 7 spans the plurality of protrusions 10, and the spindle 1 is mounted on the jig 11 until the protrusions 10 come into contact with the base of the spindle 1. The insulation coating 3 on the mounting surface 8 is formed by pressing for about 10 minutes. When pressing the spindle 1, the recesses 14 created in the insulating coating 3 of the mounting surface 8 by the protrusions 10 of the jig 11 are filled with a putty-like insulating material of the same type as the above-mentioned insulating material, and finally the insulating coating 3 is filled. Harden the whole thing.

According to the embodiment described above, the surface of the mounting surface 8 of the spindle 1 to be joined to the support portion 6 can be easily formed with the insulating coating 3 having a flat surface and a uniform thickness.

Although the method for depositing the insulating coating 3 formed on the mounting surface 8 of the spindle 1 has been described above, the method is not limited to the spindle 1.

As described above, according to the present invention, an insulating coating formed on the surface of a member by applying a thermofusible insulating material is heated and softened, and the surface of the member where the thickness of the insulating coating is to be made uniform is , placed on a flat molding jig with a plurality of protrusions of a predetermined height on the surface and coated with a mold release agent, across the plurality of protrusions, until the protrusions contact the base of the member. After pressing the member against a jig to form an insulating coating, the recesses created in the insulating coating by the protrusions of the jig are filled with a putty-like insulating material of the same type as the above-mentioned insulating material, and the insulating coating is cured. The method for applying the insulating film has been configured in such a way that the mounting surface of parts that need to be electrically insulated from other parts, such as brush support spindles, has a flat surface and a uniform thickness. It is possible to easily form an insulating coating on the wall, and mechanical precision can be easily ensured when attaching members.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a spindle for supporting a brush of a rotating electric machine on which an insulating coating is formed by the method of depositing an insulating coating according to the present invention, and FIG. 2 shows the insulating coating on the mounting surface of the spindle in FIG. 1. FIG. 2 is a partially cross-sectional perspective view showing a state of molding. DESCRIPTION OF SYMBOLS 1... Member, 3... Insulating coating, 8... Surface, 10
... protrusion, 11 ... jig, 14 ... recess.

Claims (1)

[Claims] 1. After heating a member whose surface is coated with a thermofusible insulator to form an insulating film at a temperature that softens the insulating film, the surface of the member where the thickness of the insulating film is to be made uniform is heated. Equipped with multiple protrusions of a predetermined height,
The member is placed on the surface of a flat molding jig coated with a mold release agent across the plurality of protrusions, and the member is placed on the jig until the protrusions come into contact with the base of the member. After the insulating coating is formed by pressing, the recesses formed in the insulating coating by the protrusions of the jig are filled with a putty-like insulating material of the same type as the insulating material, and the insulating coating is cured. How to apply an insulating film.