Method for manufacturing automobile exterior part and automobile exterior part

Abstract

To provide a method of manufacturing an automobile exterior trim in which a coating film layer is formed on a decorative molding without providing a plating layer and adhesion of the coating film layer to the decorative molding is high, and to provide the automobile exterior trim manufactured by the manufacturing method SOLUTION: The method for manufacturing the side visor includes a step of manufacturing a resin visor body 2, a step of manufacturing a decorative molding 3 made of a steel plate, a step of forming a coating film layer 4 on the outer surface of the decorative molding 3, and a step of attaching the decorative molding 3 to the visor body. In the process of manufacturing the decorative molding 3, a large number of linear grooves orthogonal to the longitudinal direction are formed on the outer surface of the decorative molding 3 to provide linear recesses, and in the process of forming the coating film layer 4 on the outer surface of the decorative molding 3, the coating film layer 4 is formed by applying a coating material so as to cover the outer surface of the decorative molding 3 and the linear recesses.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing an automotive exterior part such as a side visor having a decorative molding, and to an automotive exterior part manufactured by the manufacturing method. [Background technology]

[0002] Conventionally, a configuration in which a decorative molding made of steel sheet is attached to an automotive exterior part such as a side visor attached to a vehicle body for decorative purposes has been known. A manufacturing method is also known in which a plated decorative molding is subjected to a hairline finish and an organic resin paint is applied over the decorative molding and the hairline-finished surface to form a coating layer. Patent Document 1 describes a manufacturing method in which at least one surface of a steel sheet is provided with a zinc-based electroplated layer with a hairline finish, and a light-transmitting organic resin coating layer (coating layer) is formed on the surface of the zinc-based electroplated layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6540930 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional manufacturing method, a plating layer is provided between the steel sheet and the organic resin coating layer, which necessitates dedicated equipment and increases costs.

[0005] Therefore, the object of the present invention is to provide a method for manufacturing an automotive exterior part that forms a coating layer on a decorative molding without providing a plating layer and has high adhesion of the coating layer to the decorative molding, and an automotive exterior part manufactured by this manufacturing method. [Means for solving the problem]

[0006] In order to achieve the above object, the invention described in claim 1 is a manufacturing method for an automotive exterior part, including a step of manufacturing an exterior part body made of synthetic resin, a step of manufacturing a decorative molding made of steel plate, a step of forming a coating layer on the outer surface of the decorative molding, and a step of attaching the decorative molding to the exterior part body, wherein in the step of manufacturing the decorative molding, linear recesses are provided by forming countless linear grooves extending in a predetermined direction on the outer surface of the decorative molding, and in the step of forming a coating layer on the outer surface of the decorative molding, the coating layer is formed by applying paint so as to cover the outer surface of the decorative molding and the linear recesses.

[0007] The invention described in claim 2 is an automobile exterior part comprising an exterior part body made of synthetic resin and an ornamental molding made of steel plate attached thereto, characterized in that the outer surface of the ornamental molding is provided with linear recesses in which countless linear grooves extending in a predetermined direction are formed, and a coating film layer is formed by applying paint to cover the outer surface of the ornamental molding and the linear recesses. [Effects of the Invention]

[0008] According to the present invention, a linear recess formed by countless linear grooves extending in a predetermined direction is provided on the outer surface of a decorative molding attached to the exterior part body, and paint is applied to cover the outer surface of the decorative molding and the linear recess, forming a coating layer.

[0009] Therefore, by providing the linear recesses in the decorative molding, the contact area with the paint can be increased and an anchoring effect can be obtained compared to a configuration without linear recesses, so that in the process of forming a paint film layer on the outer surface of the decorative molding, the paint to be applied adheres sufficiently to the decorative molding, thereby improving the adhesion of the paint film layer. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing a state in which a side visor is attached to a window frame of an automobile. [Figure 2] FIG. 2 is a front view showing a part of the side visor. [Figure 3]FIG. 2 is a perspective view showing a part of a side visor. [Figure 4] 3 is an enlarged end view showing the end face of the decorative molding portion taken along line AA in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a side visor 1, which is an example of an automobile exterior part, and the side visor 1 thus manufactured will be described below with reference to the drawings, illustrating an embodiment of the present invention. Fig. 1 is an explanatory diagram showing a state in which a side visor 1 is attached to a window frame L of an automobile. Figs. 2 and 3 are diagrams showing a portion of the side visor 1, with Fig. 2 being a front view and Fig. 3 being a perspective view. Fig. 4 is an end view showing an enlarged view of the end face of the decorative molding 3 portion taken along line AA in Fig. 2. Note that directions in the drawings are shown as directions in the state in which the side visor is attached to the automobile, with the direction toward the vehicle body being the inside and the direction away from the vehicle body being the outside.

[0012] The manufacturing method for the side visor 1 includes the steps of manufacturing the visor body 2 made of synthetic resin, manufacturing the decorative molding 3 made of steel plate, forming a coating layer 4 on the outer surface of the decorative molding 3, and attaching the decorative molding 3 to the visor body 2. The manufactured side visor 1 comprises the visor body 2, the decorative molding 3, and the coating layer 4, and is attached to the window frame L of an automobile as shown in Figure 1, to function as a sunshade and a rain shield.

[0013] In the process of manufacturing the visor body 2, as shown in Figure 2 or 3, the visor body 2 including the long strip-shaped flange portion 5 and the eave body 6 integrally molded in a long strip shape along the flange portion 5 is manufactured by well-known injection molding or the like.

[0014] In the process of manufacturing the decorative molding 3, after the linear recesses 7 described below are formed, the decorative molding 3 is manufactured by press molding or the like, with the shape and dimensions determined so that it is a long strip that matches the shape of the flange 5. The outer surface of the manufactured decorative molding 3 is provided with the linear recesses 7, in which countless linear grooves extending in the front-to-rear direction are formed. The linear recesses 7 are formed by polishing the outer surface of the decorative molding 3 with an abrasive material of P240 in JIS R6256:2006.

[0015] The linear recesses 7 are made up of countless grooves, as shown in Figure 4. In any given area of ​​the decorative molding 3, the linear recesses 7 are formed so that the height difference a from the deepest point to the highest point of the groove satisfies 0.001 mm ≦ a ≦ 0.03 mm, and the width b from the start point to the end point of the groove satisfies 0.005 mm ≦ b ≦ 0.4 mm. Note that the highest point in one groove is defined as the start point, and the deepest point is defined as the end point.

[0016] In the process of forming the coating layer 4 on the outer surface of the decorative molding 3, a paint made of organic resin or the like is applied to cover the outer surface of the decorative molding 3 and the linear recesses 7, thereby forming the coating layer 4. At this time, the paint penetrates into the grooves of the linear recesses 7, thereby allowing the coating layer 4 to adhere sufficiently to the decorative molding 3. In the process of attaching the decorative molding 3 to the visor body 2, the decorative molding 3 manufactured in the process of manufacturing the decorative molding 3 is attached to the flange 5 of the visor body 2 manufactured in the process of manufacturing the visor body 2 using double-sided tape or the like.

[0017] The side visor 1 manufactured by the above-described process has a configuration in which the outer surface of the decorative molding 3 attached to the visor body 2 is provided with linear recesses 7 formed by countless linear grooves extending in the front-to-rear direction, and the outer surface of the decorative molding 3 and the linear recesses 7 are coated with paint to form a coating layer 4. The linear recesses 7 are formed so that the difference in height a from the deepest point to the highest point of the groove forming the linear recesses 7 satisfies 0.001 mm≦a≦0.03 mm, and so that the width b from the start point to the end point of the groove satisfies 0.005 mm≦b≦0.4 mm.

[0018] Therefore, by providing the linear recesses 7 in the decorative molding 3, the contact area with the paint can be increased and an anchoring effect can be obtained compared to a configuration without the linear recesses 7, so that in the process of forming the coating film layer 4 on the outer surface of the decorative molding 3, the applied paint adheres sufficiently to the decorative molding 3. This improves the adhesion of the coating film layer 4. Furthermore, in the linear recesses 7 that satisfy the above conditions, the width b from the start point to the end point of the groove does not increase too much, so that the formed coating film layer 4 does not have any depressions, improving the design.

[0019] Furthermore, the manufacturing method for automotive exterior parts according to the present invention is not limited to the above-described embodiment, and the overall configuration of the manufactured automotive exterior part as well as the configuration of the decorative molding can be appropriately changed as needed.

[0020] For example, in this embodiment, a side visor is described as an example of an automobile exterior part, but other examples of automobile exterior parts include a front (rear) bumper garnish, a fender garnish, a side door garnish, and a side step garnish. Furthermore, the countless linear grooves that form the linear recess 7 may not only be formed extending in the front-to-rear direction, but may also be formed in a direction perpendicular to the front-to-rear direction, in a direction that slopes upward from the front to the rear, or in a direction that slopes downward from the front to the rear, etc. [Explanation of symbols]

[0021] 1 Side visor (automotive exterior part), 2 Visor body (exterior part body), 3 Decorative molding, 4 Paint film layer, 5 Flange portion, 6 Eaves body, 7 Linear recess, L Window frame.

Claims

1. A method for manufacturing an automotive exterior part, comprising the steps of: manufacturing an exterior part body made of synthetic resin; manufacturing a decorative molding made of steel plate; forming a coating film layer on an outer surface of the decorative molding; and attaching the decorative molding to the exterior part body, In the step of manufacturing the decorative molding, a linear recess is provided by forming a countless number of linear grooves extending in a predetermined direction on the outer surface of the decorative molding, A manufacturing method for an automotive exterior part, characterized in that in the process of forming the coating layer on the outer surface of the decorative molding, a coating layer is formed by applying paint so as to cover the outer surface of the decorative molding and the linear recess.

2. An automobile exterior part comprising a synthetic resin exterior part body and a steel plate decorative molding attached thereto, An automotive exterior part characterized in that the outer surface of the decorative molding is provided with linear recesses formed with countless linear grooves extending in a predetermined direction, and a paint film layer is formed by applying paint to cover the outer surface of the decorative molding and the linear recesses.

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