JPH06227201A - Wheel for vehicle - Google Patents

Abstract

(57) [Summary] [Structure] An undercoat layer of a polyurethane resin is formed on a part or all of the surface of a light metal casting, and a metal vapor deposition film is formed on this undercoat layer, and an overcoat is further formed thereon. There is provided a vehicle wheel having a mirror surface portion formed by forming a coat layer. [Effects] The vehicle wheel of the present invention is preferable for workability and environment because it does not require a polishing step and a cleaning step, and moreover, a mirror surface made of a reflective surface similar to that when plating is applied is optional. You can get by design.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vehicle wheel having a mirrored portion of any design.

[0002]

2. Description of the Related Art Conventionally, a vehicle wheel made of cast aluminum is mirror-finished by two methods, a buff mirror-finishing method and a plating mirror-finishing method.

That is, in the buff mirror-finishing method, as shown in FIG. 2, a surface b of an aluminum casting a, which has been heat treated and whose surface has been cleaned, is polished with a sisal buff and then a cotton buff, and the polished surface c is obtained. After the cleaning, an alumite layer d is formed on the polished surface c, and an overcoat layer e is formed by coating on the alumite layer d.

On the other hand, in the plating mirror surface processing method, as shown in FIG. 3, the surface b of an aluminum casting a is roughly ground by machining (lathe) or sisal buff, and after cleaning, the polished surface c is replaced with zinc. And a nickel plating layer f and a chromium plating layer g are sequentially formed thereon.

[0005]

However, in the buff mirror finishing described above, the color tone of the aluminum material is less likely to appear due to the formation of the alumite layer d, and it is difficult to obtain a reflective surface such as plating, and the working environment is the buff. It has a drawback that a large amount of dust such as dust is generated and is extremely bad.

On the other hand, the plating mirror finishing is excellent in terms of mirror finishing, but the plating surface is peeled off due to the stress of the plating film, the wheel itself is cracked, etc., and there is a problem in terms of safety. Since a wastewater treatment facility must be provided, there is a problem that it may cause environmental pollution due to waste liquid and the like.

The present invention has been made in view of the above circumstances,
It is possible to obtain a reflective surface such as a plated surface without the occurrence of cracks, etc. that occur during plating processing. Moreover, it does not generate buff residue, does not require a cleaning step, and has a desired portion mirror-finished for vehicle wheels. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention forms an undercoat layer of a polyurethane resin on a part or all of the surface of a light metal casting, and
Provided is a vehicle wheel, which has a mirror surface portion formed by forming a metal vapor deposition film on the undercoat layer and further forming an overcoat layer on the metal vapor deposition film.

[0009]

The vehicle wheel of the present invention, as described above,
A light metal casting is undercoated with a polyurethane resin to fill the micropores existing on the surface with the resin to smooth the surface, and a metal film is vapor-deposited on the undercoating surface, and then overlaid on the vapor deposition surface. By coating, it is possible to give a mirror surface to a part or all of the wheel, which makes it possible to obtain a reflective surface similar to a plated surface without providing a polishing step and a cleaning step.

Therefore, since there is no step for buffing or the like and no dust is generated, the working environment does not deteriorate, and since no washing step is required, it is not necessary to install wastewater treatment equipment, and therefore the quality of the water due to the waste liquid. It is possible to eliminate the risk of causing environmental pollution such as.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. In the drawing, reference numeral 1 shows a vehicle wheel of the present invention, and the wheel body 1 is an undercoat of a casting 2 made of a light metal. A layer 3 is formed, a metal vapor deposition film 4 is formed on the undercoat layer 3, and an overcoat layer 5 is further formed thereon.

Here, as the light metal casting 2,
It is preferable to use an aluminum alloy or a magnesium alloy as a material, but it is preferable to use an aluminum alloy because of its excellent design.

Next, the undercoat layer 3 is made of a polyurethane resin and is formed on a part or the whole of the surface of the casting 2. Specifically, the resin is F77-66MS, M54-80A, Q-
187 (manufactured by Mitsui Toatsu Chemicals Inc.), oil-modified type, moisture-curable type,
It is preferable to use a two-component curing type polyurethane resin or the like. The curing method can be appropriately selected depending on the type of polyurethane resin, and can be, for example, room temperature curing or ultraviolet curing.

The thickness of the undercoat layer 3 is 5 to 100 .mu.m, particularly 10 to 50, as the thickness from the surface immediately after the minute irregularities 2a of the casting 2 are completely filled and become smooth.
It is preferably set to μm.

Next, the metal vapor deposition film 4 is formed on the undercoat layer 3, and it is preferable to vapor deposit aluminum, which is mainly excellent in reflectance in terms of forming a mirror surface. In this case, the vapor deposition is preferably performed by vacuum vapor deposition, and the thickness of the vapor deposition film 4 is 0.05 to 0.5 μm, particularly 0.1 to 0.3 μm.
It is preferably m. If the thickness is less than 0.05 μm, the corrosion resistance may be poor, and if it is greater than 0.5 μm, the economy (material) and the processing time may be poor. Further, instead of aluminum, Ni, Cr, or another metal having good corrosion resistance can be used.

Further, the above-mentioned overcoat layer 5 is formed on the metal vapor deposition film 4. However, the surface of the wheel 1 is thin and weak, and the metal vapor deposition film 4 is worn when the vehicle is washed and the wheel is scratched. Therefore, it is formed for the purpose of preventing this. In this case, as the resin preferably used for forming the overcoat layer 5, a fluororesin, an acrylic resin, a mixture thereof, or the like can be exemplified in that the gloss of a metal such as aluminum is not impaired. In particular, fluororesin has excellent image clarity and water repellency,
In addition, those containing a fluororesin are preferable in that dust and mud do not easily adhere to them.

As the acrylic resin, L2100,
CF-225 (manufactured by Mitsui Toatsu Chemicals) or the like is preferably used.

Further, melamine, polyester acrylate, silicone, polyamide, epoxy, epoxy-modified melamine, styrene resin and the like may be used alone or in combination for the overcoat layer 5.

The drying and curing of the overcoat layer 5 can be selected depending on the type of resin, such as room temperature drying or 100 to 200 ° C.
A method such as baking for 10 to 30 minutes can be adopted.

The thickness of the overcoat layer 5 is 0.5.
˜30 μm, particularly preferably 2 to 20 μm,
If the thickness is less than 0.5 μm, the film can be easily removed,
If it is thicker than m, the image clarity may be poor.

The undercoat layer 3 and the overcoat layer 5 may be applied by any method such as spraying, dipping, electrodeposition coating, and powder coating.

As a method of partially making the wheel body 1 mirror-finished, an undercoat layer 3 of a solvent-removable paint is used.
Is formed, is masked, and then is irradiated with ultraviolet rays to be cured, and a vapor deposition film 4 of aluminum or the like is formed on the surface thereof.
Is formed, the uncured portion masked with a solvent is removed, and finally the overcoat layer 5 is formed, whereby a partial mirror surface can be obtained. RA1353, RA1458 (manufactured by Mitsui Toatsu Chemicals, Inc.) and the like can be exemplified as the solvent-removable paint.

In the vehicle wheel of the present invention, when it is manufactured, the polishing step using a buff that has been conventionally used is not performed, and the formation of the undercoat layer 3 of the polyurethane-based resin makes the surface of the casting 2 fine. The unevenness 2a can be closed and smoothed, so that no dust is generated and the working environment can be improved. The undercoat layer 3 also enhances the adhesion of the metal vapor deposition film 4. Further, since the vehicle wheel of the present invention is not washed, it is not necessary to provide a step of treating waste liquid and the like, and does not adversely affect the environment.

[0024]

[Experimental Example] The effect of the present invention will be specifically described below with reference to an experimental example. A test piece made of an aluminum alloy was cast, and the surface of the obtained test piece was covered with a polyurethane resin (F77-6
6MS) to make it smooth, form a thickness of 30 μm and dry, then vacuum evaporate 0.2 μm of aluminum,
Further, a film of acrylic resin (L2100) was formed to a thickness of 15 μm and dried to prepare a mirror-finished test piece (No. 1). The gloss of the obtained test piece and the presence or absence of defects were evaluated. In addition, the evaluation of defects is performed by a pressure tester (available from
Using Marui MIE-731), 100 kg / cm ²
It was performed by observing the surface after pressurizing with. The results are shown in Table 1.

Also, test pieces of the same material as described above were cast, buff mirror-finished (No. 2) and plated mirror-finished (No. 3) were prepared, and evaluated in the same manner as above.

[0026]

[Table 1]

From the above results, it was confirmed that the product of the present invention had better gloss as compared with the comparative product as if it had been plated, and was excellent without crack defects.

[0028]

As described above, the vehicle wheel of the present invention does not require a polishing step and a cleaning step, which is preferable for workability and environment, and is the same as when plating is applied. It is possible to obtain a mirror surface composed of various reflective surfaces with any design.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mirror surface structure of a vehicle wheel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional buff mirror surface structure.

FIG. 3 is a cross-sectional view showing a conventional plating mirror surface structure.

[Explanation of symbols]

 1 Wheel body 2 Light metal casting 3 Undercoat layer 4 Metal deposition film 5 Overcoat layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuzo Shikida 1-5-1, Exit Hirakata, Osaka Prefecture Uemura Industrial Co., Ltd. Central Research Laboratory

Claims (1)

[Claims] 1. An undercoat layer of a polyurethane resin is formed on part or all of the surface of a light metal casting, a metal vapor deposition film is formed on this undercoat layer, and an overcoat layer is further formed thereon. A vehicle wheel having a mirror surface portion formed by