Window molding apparatus and window molding method using the same
Provided is a window molding apparatus including an inner molding part including a core molding part, which includes a plurality of sub-bottom surfaces having different curvature radii, and a flat molding part spaced apart from the sub-bottom surfaces and disposed on the core molding part, and an outer molding part which is disposed below the inner molding part with a member to be processed therebetween and in which a groove corresponding to the core molding part is defined. The outer molding part includes a lower surface, an upper surface configured to face the lower surface, and a plurality of sub-groove surfaces having different curvature radii that define the groove to provide a window including sub-bent portions having different curvature radii.
1. A window molding method using a window molding apparatus defining a first direction, a second direction perpendicular to the first direction, and a third direction perpendicular to the first and second directions, the method comprising:
an inner molding part comprising a core molding part, which comprises a plurality of sub-bottom surfaces having different curvature radii, and a flat molding part spaced apart from the sub-bottom surfaces and disposed on the core molding part; and an outer molding part which is disposed below the inner molding part with a member to be processed therebetween and in which a groove corresponding to the core molding part is defined,
the window molding method comprising:
providing a member to be processed between the inner molding part and the outer molding part; and
molding the member to be processed so that the member to be processed includes a bent portion that is bent with respect to a bending axis extending in the second direction along shapes of the groove and the core molding part,
wherein the molding of the member to be processed comprises:
providing heat to the member to be processed; and
bending the member to be processed via the inner molding part so that the bent portion of the member to be processed includes first and second sub-bent portions and the member to be processed includes first and second non-bent portions facing each other in the third direction with the bent portion therebetween,
wherein the second sub-bent portion comprises a first sub-portion and a second sub-portion,
wherein the first sub-portion of the second sub-bent portion extends continuously from the first non-bent portion to the first sub-bent portion, the first sub-bent portion extends continuously from the first sub-portion of the second sub-bent portion to the second sub-portion of the second sub-bent portion, and the second sub-portion of the second sub-bent portion extends continuously from the first sub-bent portion to the second non-bent portion,
wherein the first non-bent portion has a length in the first direction greater than a length of the bent portion in the third direction, and
wherein the first non-bent portion has a surface area greater than an inner surface area of the bent portion.
2. The window molding method of claim 1 , wherein the sub-bottom surfaces comprise:
a first sub-bottom surface and a second sub-bottom surface having a curvature radius less than that of the first sub-bottom surface,
wherein the groove include a first sub-groove surface corresponding to the first sub-bottom surface and a second sub-groove surface corresponding to the second sub-bottom surface and having a curvature radius less than that of the first sub-groove surface, and
wherein the bending of the member to be processed comprises allowing the inner molding part to move in a moving direction into the groove so that the first sub-bottom surface and the first sub-groove surface correspond to each other with the member to be processed therebetween, and the second sub-bottom surface and the second sub-groove surface correspond to each other with the member to be processed therebetween.
3. The window molding method of claim 2 , wherein the molding of the member to be processed comprises:
removing the inner molding part moving into the groove through a front or rear surface of the window molding apparatus, which is perpendicular to the moving direction of the inner molding part.
4. The window molding method of claim 1 , wherein the bending of the member to be processed comprises:
molding the bent portion of the member to be processed so that the first sub-bent portion includes a flat surface, and the second sub-bent portion includes a curved surface having a curvature radius of about 4 mm or less.
5. The window molding method of claim 1 , wherein the member to be processed comprises:
a glass substrate,
wherein the providing of the heat to the processed member, the heat is provided to at least one of the inner molding part or the outer molding part to reduce viscosity of the member to be processed to about 107 poises to about 109 poises.
6. The window molding method of claim 1 , further comprising, before the providing of the member to be processed, molding an edge of the member to be processed so that the member to be processed includes a bent edge portion.
7. The window molding method of claim 1 , further comprising, after the molding of the member to be processed, chemically strengthening the member to be processed.
8. A window molding method using a window molding apparatus comprising:
an inner molding part comprising a core molding part, which comprises a plurality of sub-bottom surfaces having different curvature radii, and a flat molding part spaced apart from the sub-bottom surfaces and disposed on the core molding part; and an outer molding part which is disposed below the inner molding part with a member to be processed therebetween and in which a groove corresponding to the core molding part is defined,
the window molding method comprising:
providing a member to be processed between the inner molding part and the outer molding part; and
molding the member to be processed so that the member to be processed includes a bent portion that is bent along shapes of the groove and the core molding part,
wherein the molding of the member to be processed comprises:
providing heat to the member to be processed; and
bending the member to be processed so that the bent portion of the member to be processed includes first and second sub-bent portions having different curvature radii and first and second non-bent portions facing each other with the bent portion therebetween, wherein the outer molding part comprises:
a lower surface, an upper surface facing the lower surface, and first and second sub-groove surfaces having different curvature radii that define the groove,
the groove comprises:
a lower groove portion defined by a first sub-groove surface and a second sub-groove surface, which have different curvature radii; and
a plurality of sub-cavities, which extends from the lower groove portion toward the upper surface, and each of which is defined to have a curved surface, and
the outer molding part further includes a plurality of movable molds respectively disposed on the sub-cavities to move along the curved surfaces of the sub-cavities,
wherein the bending of the member to be processed includes allowing the inner molding part to move so that the core molding part and the lower groove portion correspond to each other with the member to be processed therebetween.
9. The window molding method of claim 8 , wherein each of the movable molds comprises:
a curved mold part having a curved surface corresponding to the curved surface of each of the sub-cavities and a flat mold part facing the curved mold part,
wherein in the disposing of the member to be processed, the flat mold parts of the adjacent movable molds are disposed adjacent to each other below the member to be processed and arranged parallel to each other, and
wherein in the bending of the member to be processed, the flat mold parts of the adjacent movable molds are spaced apart from each other to face each other with the member to be processed therebetween.