JP3580839B2 - Powder film forming method and film forming medium - Google Patents

Description

[0001]
[Industrial applications]
The present invention provides a powder film forming method of forming a film by adhering powder to the surface of various parts or articles used in various industrial fields, and the method of applying the powder adhering to the surface to the part side or the article side. The present invention relates to a film forming medium for transferring.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method of forming a film by attaching powder to the surface of various parts or articles (hereinafter, simply referred to as “parts”), a part is immersed in a liquid in which charged powder is suspended. By applying a voltage to the component with an external power supply, the charged powder is attracted to the component, covering the component with the powder, and then heating the component covered with the powder to melt the powder. By applying a voltage-applied part to the space where the charged powder is scattered, the powder is attracted to the part, so-called an electrodeposition coating method that forms a film on the surface of the part. Forming a film on the surface of the component by heating the part on which the powder film is formed, and melting the powder to form a film on the surface of the part. After forming a spray film on the part by spraying with an appropriate resin medium, Curing the fat to form a film, the so-called various film-forming method according to spray coating method or the like powder is known.
[0003]
[Problems to be solved by the invention]
In Japanese Patent Application No. 224,782, filed by the present applicant, the present applicant has proposed a film forming method of forming a film by adhering a powder to the surface of a component, and using the conventional powder as described above. Various problems, such as problems such as peeling of a film generated due to a weak bonding force between a part and a formed film, corrosion of a part, and deterioration of workability when a part is small, have problems that the method of forming a film has. Solved the problem.
[0004]
For example, a component c having an adhesive layer made of an uncured resin or the like formed on a surface of a container c disposed on a vibration device v as shown in FIG. A mixture t composed of a spherical film-forming medium made of metal or ceramics having a diameter of about 0.5 to several mm, for example, is put into the container, and the container c is vibrated by a vibrating device v to produce a component w. It forms a powder film on the surface. Instead of a component having an adhesive layer such as an uncured resin formed on the surface, a component having no adhesive layer and an uncured resin forming the adhesive layer are separately put into a container c, and the component surface is formed. An adhesive layer can also be formed.
[0005]
In the powder film forming method described above, the powder adhered directly or through a film forming medium to the component having the adhesive layer formed on the surface is hit with the spherical film forming medium and pressed against the adhesive layer. Alternatively, the adhesive layer covered with the powder is extruded onto the surface of the powder by being pressed in and firmly adhering and being beaten by the film forming medium, and is further applied to the film forming medium on the extruded adhesive layer. The adhering powder moves to the adhesive layer side of the component when the film-forming medium collides with the component, and the adhesion of the powder to the component proceeds. When the adhesive layer is no longer extruded on the surface of the powder even if the component is hit with the film forming medium, the substantial powder adhesion step, that is, the powder film formation is completed.
[0006]
By the way, as shown in FIG. 4 which is an enlarged view showing a collision state between a component w and a spherical film forming medium m (hereinafter, also simply referred to as a “spherical medium”), it is used in the above-described film forming method. If the film-forming medium to be formed is a spherical medium m and a corner a is present in the part w, the spherical medium m does not reach the corner a of the part w and thus adheres to the spherical medium m. The powder p does not adhere to the corner a of the component w, so that the film f is not formed on the corner a of the component w.
[0007]
An object of the present invention is to solve the problems of the powder film forming method described above, and to provide a powder film forming method excellent in productivity and a film forming medium used in the powder film forming method. is there.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for forming a film-forming medium having an acute-angled projection at a collision portion between a film-forming medium and a component by colliding the film-forming medium with a component having an adhesive layer on its surface. The powder to be formed is embedded in the adhesive layer to form a film on the surface of the component, and the film forming medium is a film forming medium having sharp projections.
[0009]
Hereinafter, an example of the present invention will be described. However, the present invention is not limited to the example without departing from the spirit of the present invention.
[0010]
As shown in FIG. 2, which is an enlarged view showing the state of collision between the part w and the film forming medium m of the present invention, in the present invention, a film forming medium m having an acute projection m ′ is used. . The film-forming medium m having such an acute-angled projection m ′ can reach the corner a of the component w because the acute-angled projection m ′ can reach the corner a of the component w. Due to the collision with w, the powder p adhered to the film forming medium m is also transferred to the corner a of the component w, and the film f can be formed at the corner a of the component w. Further, regardless of the transfer of the powder p adhered to the film forming medium m to the corner a of the component w, the powder p already adhered to the corner a of the component w is converted to the film forming medium m. The powder p can be firmly adhered to the component w by pressing with the acute-angled projection m ′.
[0011]
By the way, as shown in FIG. 3A, which is an enlarged perspective view of the film forming medium m, the acute angle projection m ′ is at least one of the substantially triangular pyramid-shaped film forming medium m. The angle α formed by the generatrix may be an acute angle, and as shown in FIG. 3B, the angle of the generatrix of the projection m ′ projecting from the surface of the main body m ″ of the film-forming medium m. The angle α may be an acute angle, and furthermore, the angle α of the corner of the projection m ′ of a part of the substantially cubic shape may be an acute angle as shown in FIG.
In any case, it is only necessary that a part of the film forming medium m has an acute-angled projection m ′ that can reach the corner a of the component w.
If the tip of the sharp projection m ′ is sharpened in a needle shape, the surface of the coating f is roughened or the formed coating f is shaved off. Preferably has an appropriate radius.
[0012]
The film forming medium m having the above-mentioned acute projection m ′ is obtained by crushing a block of stone, hard synthetic resin, ceramics, glass or the like into an approximately uniform size using a known crusher into an irregular shape. Can be manufactured. Since most of the film-forming medium m pulverized irregularly in this way has the sharp projection m 'formed thereon, it can be applied to the powder film-forming method of the present invention. In addition, since a block of stone, hard synthetic resin, ceramics, glass, or the like can be pulverized into an irregular shape to produce a film forming medium m having an acute projection m ′, the film can be formed easily and inexpensively. The medium m can be manufactured.
In the case of a nail-shaped film forming medium m as shown in FIG. 3B, for example, a commercially available small nail, screw, tack, or the like can be used.
[0013]
By the way, an amorphous film-forming medium having an acute-angled projection is particularly likely to break or chip due to collision between the film-forming media or the collision of the film-forming medium with a part. . Then, the cracked or chipped pieces of the film-forming medium are taken into the film formed on the surface of the component, causing problems such as impairing the performance, uniformity or smoothness of the material, etc. of the film.
Further, when the film forming medium is cracked, chipped, or worn, particularly when the sharp projections are chipped, the film forming medium cannot collide with the corners of the component, and the film is formed on the corners of the component. Since the film is no longer formed, the film forming medium must be replaced, and therefore, the productivity of the part on which the film is formed decreases and the cost of the part on which the film f is formed increases.
[0014]
Therefore, in the above-described film forming method, by using the film forming medium having the coated sharp-angled projections, it is possible to form a powder film excellent in productivity and uniform in performance and material. In addition, it is preferable that the film forming medium having the acute-angled projections described above is configured to prevent the occurrence of cracks, chips, or rapid wear. Therefore, a means for applying a coating to a film-forming medium having such an acute projection will be described below.
[0015]
A case where a container c provided with a vibrating device v as shown in FIG. 1 is used as one means for applying a coating to a film-forming medium having a sharp projection is described below. .
[0016]
First, a film-forming medium having an acute projection is dipped in a liquid resin, taken out, and semi-cured so that the liquid resin has appropriate adhesiveness.
Next, an adhesive resin layer is formed on the above surface together with the resin powder that adheres to the film-forming medium having the sharp projections and forms a coating, such as resin black or carbon black that acts as a separating material for the resin powder. The formed film forming medium having the sharp projections is put into the container c, the vibrator v is driven to vibrate the container c, and the resin powder adheres to the surface of the film forming medium having the sharp protrusions. At the same time, when the film-forming media having the sharp projections collide with each other, the powder adhered to the film-forming medium having the sharp projections is pressed or pressed into the adhesive resin layer. And adheres firmly. Thereafter, the film-forming medium having the acute-angled projections to which the resin powder is attached is taken out of the container c and subjected to a heat treatment to cure the resin layer, thereby coating the film-forming medium having the acute-angled projections. In addition, it is also possible to heat the resin powder until the resin powder is partially melted, and to weld the resin powders constituting the coating.
[0017]
By applying the coated film forming medium having the sharp projections to the powder film forming method, the coating medium having the sharp projections is cracked, chipped, or extremely worn. Can be prevented.
Also, in particular, by applying a coating with a resin powder or the like that easily generates static electricity to the film forming medium having the sharp projections, the powder can be more uniformly attached to the surface of the film forming medium. The film formed on the surface can be made more uniform, and more powder adheres to the film forming medium due to static electricity. Migration can be made, thus reducing the time for film formation on the part. Furthermore, by applying a coating to a film-forming medium having an acute-angled projection, irregularities or projections existing on the surface of the film-forming medium are covered, so that film formation that is harmful in the process of forming a film on a part is performed. The polishing effect of the medium is reduced, and the formation of a film on the part is promoted.
[0018]
In the embodiment described above, means for applying a coating to a film-forming medium having an acute projection by using a container c provided with a vibration device v as shown in FIG. As described above, the liquid resin, in some cases, a resin diluted with a solvent is atomized and sprayed onto a film-forming medium having sharp projections, and then the liquid resin is cured to form a film-forming medium. A resin coating can be applied, and an electrostatic spray method using static electricity can be applied. Further, a coating can be applied to the film-forming medium by heating and evaporating a metal or resin in a vacuum and condensing the vapor on the surface of the film-forming medium having the sharp projections. In addition, various known coating means can be applied to coating of a film forming medium having a sharp projection.
[0019]
As described above, the film forming medium having the sharp projections is placed in a container c as shown in FIG. 1 together with the component w having the adhesive layer formed on the surface thereof, the powder constituting the film, and the like. The vibration device v is driven to vibrate the container c. The powder adhered directly or through a film-forming medium having a sharp projection to the part w having the adhesive layer formed on the surface is beaten by the film-forming medium to be pressed or pressed into the adhesive layer and firmly. The adhesive layer covered with the powder is extruded onto the surface of the powder by being attached to the component w and being beaten by the film forming medium, and further adhered to the film forming medium on the extruded adhesive layer. When the film forming medium collides with the part w, the powder is transferred to the part w side, and the adhesion of the powder to the part w progresses, so that a powder film is formed. Moreover, as shown in FIG. 2 described above, the acute angle projection m ′ of the film forming medium m can reach the corner a of the component w. Can also form the coating f.
[0020]
In the above embodiment, the container c in which the vibrating device v is disposed is used, and the mixture t such as the component w on which the adhesive layer is formed, the powder, and the film-forming medium having the sharp projections is used. Although an example is shown in which vibration is applied to the mixture, a stirring device such as a screw or a wing member may be provided in the container to stir the mixture t to form a powder film. Further, various devices can be used as long as the mixture t can be vibrated or stirred.
[0021]
As the film-forming medium, only a film-forming medium having an acute projection can be used.However, a film-forming medium having an acute projection and another film-forming medium such as a spherical medium are mixed. Can also be used.
In particular, the film f is formed at the corner a of the component w by the film forming medium having the sharp projections by mixing and using the film forming medium having the sharp projections and the spherical medium. And a film f having a smooth surface can be formed by the spherical medium.
[0022]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
By using a film-forming medium having sharp projections, a film can also be formed at the corners of the component.
By coating the film-forming medium having the sharp projections, the film-forming medium can be prevented from cracking, chipping or abrasion, so that no fragments of the film-forming medium are mixed into the film. In addition, a uniform film can be formed in terms of material.
Since the coating is applied to the film forming medium having the sharp projections, the polishing effect of the film forming medium is reduced, and the work of forming a film on a part can be further promoted.
The use of a film-forming medium having coated sharp projections improves the durability of the film-forming medium, thereby increasing the replacement interval of the film-forming medium, and therefore, the use of a component on which a film is formed. Productivity is improved, and the price of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view including a partial cross section of an example of a powder film forming apparatus.
FIG. 2 is an enlarged view showing a collision state between a component and a film forming medium having an acute projection of the present invention.
FIG. 3 is an enlarged perspective view of a film forming medium.
FIG. 4 is an enlarged view showing a collision state between a component and a spherical film-forming medium.
[Explanation of symbols]
c: Container f: Film m: Film forming medium v: Vibrator w: Parts

Claims (3)

By colliding a film-forming medium having an acute projection with a component having an adhesive layer on the surface, powder present in a collision portion between the film-forming medium and the component is embedded or adhered to the adhesive layer. Forming a film on the surface of the component. A film forming medium for forming a powder film having an acute-angled projection. The film forming medium for forming a powder film according to claim 2, wherein the surface is coated.

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