JP3381867B2 - Powder film forming equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder film forming apparatus for adhering powder to the surface of various parts or articles used in various industrial fields to form a film.

[0002]

2. Description of the Related Art Conventionally, an apparatus for depositing powder on the surface of various parts or articles (hereinafter, simply referred to as "parts") used in various industrial fields to form a film is preheated. Disperse powder on parts and attach them by powder mist,
After that, the powder is brought into contact with a powder coating device that melts the powder to form a film, or parts that have been previously tackified, and vibration is applied to the parts to attach the powder and form a film. Various powder film forming devices are known.

[0003]

In 1991 Japanese Patent Application No. 224782 of the present applicant, the present applicant has proposed a film forming method for forming a film by adhering powder on the surface of a component. , Problems that the conventional powder film forming method has, for example, peeling of the film that occurs due to the weak bonding force between the part and the formed film, problems such as corrosion of the part and workability when the part is a small item Solved various problems such as deterioration.

For example, as shown in FIG. 1, a container C placed on a vibrating device V has a surface on which an adhesive layer such as uncured resin is formed, a part W, various metals and resins. And a powder T and a mixture T composed of a film-forming medium such as a spherical body made of metal or ceramics having a diameter of about 0.5 to several mm, and the container C is vibrated to produce the component W. It forms a powder film on the surface. It should be noted that, instead of a component having an adhesive layer such as an uncured resin formed on the surface thereof, a component having no adhesive layer formed thereon and a substance such as an uncured resin forming the adhesive layer are separately charged into the container C. It is also possible to form an adhesive layer on the surface.

In the above film forming method, the powder adhered to the part having the adhesive layer formed on the surface thereof directly or through the film forming medium is hit by the film forming medium and pressed or contacted with the adhesive layer. While press-fitting and firmly adhering,
Whether the adhesive layer covered with the powder is extruded onto the surface of the powder by being hit by the film-forming medium, and whether the powder in the mixture T directly adheres to the extruded adhesive layer. Alternatively, the powder adhering to the film-forming medium moves to the adhesive layer when the film-forming medium collides with the component, and the powder adheres to the component. When the pressure-sensitive adhesive layer is not extruded onto the surface of the powder even when hit by the film-forming medium, the substantial powder adhesion step, that is, the powder film formation is completed.

In the above-described powder film forming process, powder may directly adhere to the part on which the adhesive layer is formed without passing through the film forming medium, but in order to form a uniform and strong powder film. It is preferable that a large amount of powder adheres to the part on which the adhesive layer is formed via the film forming medium,
Such conditions can be achieved by appropriately adjusting the material, shape, and size of the powder and the film-forming medium, or the strength of vibration or stirring applied to the container.

The container C used in the powder film forming apparatus for carrying out the above-described film forming method is made of a hard material such as a hard synthetic resin or a metal, and as an example, FIG.
As shown in FIG. 3, the columnar portion is formed in a bowl shape having an opening c1 at the upper portion, and the central portion of the bottom c2 of the container C is bulged upward to reach the vicinity of the opening c1. c3 is projected.

In FIG. 1, F is a machine base of the vibrating device V. A diaphragm f3 is arranged on the machine base F via coil springs f1 and f2, and is projected on the diaphragm f3. The columnar portion c3 of the container C is attached to the upper end of the vertical axis f4. A motor f5 is attached to the lower surface of the diaphragm f3, and a weight f7 is attached to the output shaft f6 of the motor f5.
Are eccentrically attached. Therefore, since the eccentric weight f7 is rotated by rotating the motor f5, the container C is vibrated via the vertical axis f4 attached to the vibration plate f3.

By the way, in the container C as described above, a component W having an adhesive layer of uncured resin or the like formed on the surface thereof, a powder and a film forming medium, and, if necessary, a separating material for the powder are used. When the mixture T made of carbon black or the like that acts is charged, and the vibrating device V is operated to vibrate the container C to perform the film forming treatment, the powder in the mixture T directly or on the film forming medium. The powder is attached to the component W via the above to form a film, but at the same time, the powder is also attached to the inner surface of the container C. That is, the powder introduced into the container C directly adheres to the inner surface of the container C, or the film-forming medium on which the powder adheres collides with the inner surface of the container C to adhere to the film-forming medium. The powder that has migrated from the film forming medium to the inner surface side of the container C forms a powder film on the inner surface of the container C.

Forming a powder film on the inner surface of the container C wastes the film forming material such as powder and requires the work of removing the film from the inner surface of the container C. In addition, the film adhered to the inner surface of the container C becomes a lump in the middle and peels off from the inner surface of the container C. When such a lump of the film adheres to the component W, the film formed on the surface of the component W Thickness uniformity will be compromised. Further, as described above, since the container C is made of a hard material such as synthetic resin or metal, the component W is formed in the film forming process.
May hit the vibrating container C and be damaged.

The object of the present invention is to prevent the powder from adhering to and depositing on the inner surface of the container as described above, and to prevent the parts from being damaged when they collide with the vibrating container and to maintain and manage them. To provide a simple powder film forming apparatus.

[0012]

In order to achieve the above object, the present invention provides a part or a powder having an adhesive layer formed on the surface thereof.
Then, put the film-forming medium into the vibrating container and
Powder was formed on the surface of the part through the film forming medium
A powder film forming apparatus for forming a film on a part by adhering it to an adhesive layer , comprising:
In order to prevent accumulation, the inner surface of the container is rubber-lined.

Examples of the present invention will be described below, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

As shown in FIG. 2 which is a perspective view of the container C of the present invention having a partial cutaway portion and in FIG. 3 which is a sectional view taken along the line I--I of FIG. Has a rubber lining G made of silicone rubber or urethane rubber. The hardness of the rubber lining G is
If it is too hard, the component W may hit the vibrating container C and be damaged, and when the film-forming medium collides with the rubber lining G, the powder adhering to the film-forming medium will be on the rubber lining G side. Then, the rubber lining G is covered with the powder.

By applying the rubber lining G having an appropriate hardness to the inner surface of the container C, the inner surface of the container C is soft even if the film forming medium to which the powder adheres collides with the inner surface of the container C. The powder adhered to the film forming medium is prevented from moving from the film forming medium to the inner surface of the container C, and therefore the amount of the powder adhered to the inner surface of the container C is extremely reduced.

The hardness of the rubber lining G is determined by the material of the powder, the material and size of the film forming medium, or the amount and composition of the mixture T charged in the container C. However, the hardness of the rubber lining G is 10 to 80 degrees in Shore A hardness, particularly 20 to 50.
A range of degrees is preferred.

FIG. 4 is a partially enlarged view of a container C provided with a rubber lining G, which is another embodiment different from the above-mentioned embodiment.
As shown in FIG. 3, by providing an air chamber c4 of an appropriate height with the upper surface of the mixture T interposed between the container C and the rubber lining G in the vicinity of the upper surface of the mixture T charged in the container C. In particular, it is possible to prevent the powder from adhering to or depositing on the rubber lining G near the upper surface of the mixture T where the powder is likely to deposit.

The container described above is not limited to any one, and various containers such as a cylindrical container and a box container can be used. Further, instead of vibrating the container, a vibrating body is arranged in the container and the mixture T is vibrated,
It is possible to form a powder coating on the component or to form a powder coating on the component by stirring the mixture T.

[0019]

Since the present invention is constructed as described above, it has the following effects. The adhesion of powder to the inner surface of the container is greatly reduced, therefore
It is possible to prevent the powder coating adhered to the inner surface of the container from being peeled off and taken into the coating formed on the parts, and the number of times of removing the powder coating adhered to the inner surface of the container can be reduced. Therefore, the productivity of the part on which the film is formed is improved. Further, it is possible to prevent the parts from colliding with and damaging the vibrating container.

[Brief description of drawings]

FIG. 1 is a front view including a partial cross section of an embodiment of a powder film forming apparatus of the present invention.

FIG. 2 is a perspective view having a partially cutaway portion of the container as an example.

FIG. 3 is a sectional view taken along line I-I of FIG.

FIG. 4 is a partially enlarged view of a container provided with a rubber lining which is another embodiment.

[Explanation of symbols]

C ... ・ Container G .... Rubber lining V ... Excitation device W ・ ・ ・ ・ Parts

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Nagata 1 Ellie Part 2 at No.22, Matsumuro Okamicho, Nishikyo-ku, Kyoto City, Kyoto Prefecture Inter-metallics Co., Ltd. (56) References Japanese Patent Publication Sho 50-3250 ( JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) C23C 24/04

Claims (2)

(57) [Claims] 1. A component having an adhesive layer formed on its surface, a powder, and
Put the film-forming medium in a vibrating container to form a film.
Adhesion of the powder formed on the surface of the component through the forming medium
A powder film forming apparatus for forming a film on a part by adhering to a layer , wherein the powder is deposited on the inner surface of the container.
Rubber lining on the inner surface of the container to prevent
Powder film forming apparatus characterized by being applied . 2. The powder film forming apparatus according to claim 1, wherein the shear lining A hardness of the rubber lining is in the range of 10 to 80 degrees.