EP-4737100-A1 - STEREOLITHOGRAPHIC ARTICLE FOR VEHICLE AND METHOD FOR PRODUCING SAME

Abstract

In order to make the film thickness of a coating film (15) uniform, a stereolithographic article (1) has: a main body having a plurality of step-like recessed portions (12) formed in a layering direction by stereolithography; groove portions (13) or wall portions (14) formed discretely in the step-like recessed portions (12); and a coating film (15) applied to a surface of the main body including the step-like recessed portions (15).

Inventors

• NOGUCHI, YUJI
• ENDO, TOMOYA
• YOSHIDA, AKIRA

Assignees

• Nissan Motor Co., Ltd.

Dates

Publication Date

20260506

Application Date

20230627

Claims (10)

1. A stereolithographic article for a vehicle, comprising: a main body having a plurality of step-like recessed portions formed in a layering direction by stereolithography; groove portions or wall portions formed discretely in the step-like recessed portions; and a coating film applied to a surface of the main body including the step-like recessed portions.
2. The stereolithographic article for a vehicle according to claim 1, wherein the groove portions or wall portions are formed at positions that are offset in an extension direction of the step-like recessed portions for each or every plurality of the step-like recessed portions.
3. The stereolithographic article for a vehicle according to claim 1 or 2, wherein a groove width of the groove portions or a wall thickness of the wall portions is 100 µm or less.
4. The stereolithographic article for a vehicle according to any one of claims 1 to 3, wherein the groove portions or wall portions are formed discretely at intervals of 500 µm or less.
5. The stereolithographic article for a vehicle according to any one of claims 1 to 4, wherein the step-like recessed portions have a layering pitch of 35 to 350 µm.
6. The stereolithographic article for a vehicle according to claim 5, wherein the groove portions have a groove depth that is 50% or more of the layering pitch.
7. The stereolithographic article for a vehicle according to claim 5, wherein the wall portions have a wall height that is 50% or more of the layering pitch, and walls of the wall portions has a length in a wall step direction that is 50% or more of a depth of the step-like recessed portions.
8. A method for producing a stereolithographic article for a vehicle, comprising: a step of forming a main body having a plurality of step-like recessed portions in a layering direction by stereolithography; discretely forming groove portions or wall portions in the step-like recessed portions; and applying a paint to a surface of the main body including the step-like recessed portions.
9. The method for producing a stereolithographic article for a vehicle according to claim 8, wherein the groove portions or the wall portions are formed in the main body simultaneously in the step of forming the main body.
10. The method for producing a stereolithographic article for a vehicle according to claim 8, wherein the groove portions or the wall portions are formed in the main body after the main body is formed.

Description

Technical Field The present invention relates to a stereolithographic article for a vehicle and a method for producing the same. Background Art Optical shaped articles, by their very nature, have step-like recessed portions that are cured by scanning light. The surface is therefore smoothed by applying a photocurable resin with such high viscosity that it can fill the recessed portions due to surface tension (Patent Document 1). Prior Art Documents Patent Documents Patent Document 1: JP5-337951A Summary of Invention Problems to be solved by Invention When the optical shaped article is small as in the above prior art and the step-like recessed portion has a short extension length, the high-viscosity paint can fill the recessed portion, and its surface can readily be smoothed. However, if the optical shaped article is large and the step-like recessed portion has a long extension length, such as in the case of a component for vehicles, the paint applied to the step-like recessed portion shrinks and aggregates due to surface tension, resulting in a problem of uneven film thickness in the step-like recessed portion. A problem to be solved by the present invention is to provide a stereolithographic article for vehicles in which the film thickness of the step-like recessed portion is uniform. Means for solving Problems The present invention solves the above problem through discretely forming groove portions or wall portions in a plurality of step-like recessed portions formed in a layering direction by stereolithography, and applying paint to the surface of a main body including the step-like recessed portions. Effect of Invention According to the present invention, the film thickness in the step-like recessed portions becomes uniform. Brief Description of Drawings [FIG. 1] FIG. 1 is a perspective view illustrating an embodiment of a stereolithographic article according to the present invention.[FIG. 2] FIG. 2 is a device configuration diagram illustrating an example of a stereolithography device for producing a stereolithographic article according to the present invention.[FIG. 3A] FIG. 3A is an enlarged perspective view illustrating an enlarged view of part III of FIG. 1.[FIG. 3B] FIG. 3B is a cross-sectional view taken along line IIIB-IIIB of FIG. 3A.[FIG. 3C] FIG. 3C is a cross-sectional view illustrating an example of a coating film formed on the step-like recessed portions of FIG. 3B.[FIG. 4A] FIG. 4A is a perspective view illustrating an embodiment of groove portions according to the present invention.[FIG. 4B] FIG. 4B is a perspective view for describing the action of an embodiment of the groove portions according to the present invention.[FIG. 4C] FIG. 4C is a view taken along arrow IVC of FIG. 4A.[FIG. 4D] FIG. 4D is a cross-sectional view taken along line IVD-IVD of FIG. 4C.[FIG. 5A] FIG. 5A is a perspective view illustrating an embodiment of groove portions according to the present invention.[FIG. 5B] FIG. 5B is a perspective view illustrating another embodiment of groove portions according to the present invention.[FIG. 6A] FIG. 6A is a perspective view illustrating an embodiment of wall portions according to the present invention.[FIG. 6B] FIG. 6B is a perspective view illustrating the action of an embodiment of the wall portions according to the present invention.[FIG. 6C] FIG. 6C is a view taken along arrow VIC of FIG. 6A.[FIG. 6D] FIG. 6D is a cross-sectional view taken along line VID-VID of FIG. 6C.[FIG.7A ] FIG. 7A is a perspective view illustrating an embodiment of wall portions according to the present invention.[FIG. 7B] FIG. 7B is a perspective view illustrating another embodiment of wall portions according to the present invention. Mode(s) for carrying out Invention Hereinafter, one or more embodiments for carrying out the present invention will be described with reference to the drawings. Stereolithographic article 1 of the present embodiment is an article used, for example, as a component for automobiles. It is not particularly limited, provided that it is composed of a photocurable resin, and its examples include all the components for automobiles. In the following description, the present invention will be described using the stereolithographic article 1 as an example, although it is not a specific component for automobiles. FIG. 1 is a perspective view illustrating an embodiment of the stereolithographic article 1 according to the present invention. The stereolithographic article 1 of the present embodiment has a shape obtained by cutting a rectangular parallelepiped along a diagonal slope, and has a slope 11. The stereolithographic article 1 of such a shape can be produced, for example, as follows. FIG. 2 is a device configuration diagram illustrating an example of a stereolithography device 2 for producing the stereolithographic article 1 of the present embodiment. The stereolithography device 2 of this example is a laser scanning stereolithography device 2 and includes a liquid vat