JP2012091994A - Method for manufacturing circular curved glass plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of manufacturing a circular curved glass plate having a large central angle.SOLUTION: A mold 10 whose outer shape has a columnar shape is disposed in such a way that the central axis C is made horizontal, and in a state that a glass plate 11 is put on the mold 10, the glass plate 11 is heated and softened, the central part 11a of the glass plate 11 is curved along the outer peripheral surface 10a of the mold 10 and both ends 11b, 11c of the glass plate 11 are located below the central axis C of the mold 10. The softened glass plate 11 is cooled and hardened in a state that both ends 11b, 11c of the softened glass plate 11 not curving along the outer peripheral surface 10a of the mold 10 are biased toward the center side of the mold 10.

Description

  The present invention relates to a method for manufacturing an arcuate glass curved plate.

  The crystallized glass plate has an advantage that it has high heat resistance and a low coefficient of thermal expansion. For this reason, conventionally, a crystallized glass plate has been widely used as a heat ray transmitting part of a heating device such as a stove or a fireplace (for example, Patent Document 1 below).

  In order to improve the designability of the heating device, the crystallized glass plate used for such applications is required to be formed in a shape corresponding to the heating device. For example, in order to improve the visibility of the combustion device arranged inside the heating device, a crystallized glass plate having a circular cross section (hereinafter referred to as “arc-shaped crystallized glass curved plate”) is required. Sometimes.

Japanese Patent Laid-Open No. 5-229851

  As a method of manufacturing an arc-shaped crystallized glass curved plate, a crystalline glass flat plate is arranged on a setter having a concave arrangement surface with a circular arc cross section, and the crystalline glass flat plate is heat-treated in that state. The method of doing is mentioned. In this manufacturing method, in the heat treatment step, the crystalline glass flat plate softens and follows the concave arrangement surface. As a result, the cross section is formed in an arc shape. Then, an arc-shaped crystallized glass curved plate is obtained by crystallizing the crystalline glass plate.

  When manufacturing an arc-shaped crystallized glass curved plate by the above manufacturing method, it is a requirement that a crystalline glass flat plate can be arranged on an arrangement surface having an arc-shaped cross section. For this reason, the width | variety of the crystalline glass flat plate which can be used needs to be 2 times or less of the curvature radius of an arrangement | positioning surface. This is because when the width of the crystalline glass flat plate exceeds twice the radius of curvature of the arrangement surface, the crystalline glass flat plate protrudes from the arrangement surface. Therefore, the above manufacturing method has a problem that an arc-shaped crystallized glass curved plate having a width dimension exceeding twice the radius of curvature cannot be manufactured. That is, the above manufacturing method has a problem that an arc-shaped crystallized glass curved plate having a large central angle cannot be manufactured.

  This invention is made | formed in view of this point, The objective is to provide the method of manufacturing an arcuate glass curved plate with a large central angle.

  The method for manufacturing an arcuate glass curved plate according to the present invention relates to a method for manufacturing an arcuate glass curved plate by softening and deforming a glass plate. The method for manufacturing an arcuate glass curved plate according to the present invention includes a deformation step and a cooling step. In the deformation process, a mold having a cylindrical outer shape is arranged so that the central axis is horizontal, and the glass plate is softened by heating the glass plate in a state where the glass plate is arranged on the mold. In this step, the center portion is set along the outer peripheral surface of the mold, and both end portions of the glass plate are positioned below the center axis of the mold. The cooling step is a step of cooling and hardening the softened glass plate in a state where both end portions not extending along the outer peripheral surface of the softened glass plate mold are biased toward the center side of the mold.

  According to the method for manufacturing an arcuate glass curved plate according to the present invention, it is possible to easily manufacture an arcuate glass curved plate having a central angle exceeding 180 °.

  In the cooling step, the method for urging both ends toward the center of the mold is not particularly limited. For example, in the cooling process, a pair of columnar or cylindrical urging molds are pressed against both ends of the softened glass plate to urge both ends toward the center of the mold. Also good.

  Although the shape of a glass plate is not specifically limited, It is preferable to use a glass flat plate as a glass plate. By doing so, an arc-shaped glass curved plate with high shape accuracy can be manufactured.

  Moreover, after performing a deformation | transformation process using a crystalline glass plate as a glass plate, and before cooling the softened glass plate, it may further perform the crystallization process which crystallizes a crystalline glass plate Good. By doing so, an arc-shaped crystallized glass curved plate can be manufactured.

  In addition, after performing a deformation | transformation process, after cooling once, a crystallization process may be performed after that, but it is preferable to perform a deformation | transformation process and a crystallization process continuously. That is, it is preferable to perform the crystallization step without substantially cooling after the deformation step. By doing so, not only can the manufacturing process of the arc-shaped crystallized glass curved plate be simplified, but also an arc-shaped crystallized glass curved plate crystallized with high uniformity can be manufactured.

  In the present invention, “crystalline glass” refers to glass that can be crystallized by heat treatment to become crystallized glass.

  In the present invention, the “arc-shaped glass curved plate” refers to a glass plate having a circular cross section.

  In the present invention, the “columnar shape” includes a columnar shape in which a part of the outer periphery is cut out and the cross section is an arc shape.

  In the deformation step, it is preferable that the glass plate is heated in a state in which a flexible ceramic sheet is disposed on at least a portion of the glass plate disposed on the mold that is in contact with the mold. In this case, when the glass plate is heated, the stress applied to the portion of the glass plate in contact with the mold can be reduced. Therefore, damage during heating of the glass plate can be suppressed.

  It is preferable to arrange | position a ceramic sheet | seat on a glass plate until a cooling process is complete | finished. In this case, the cooling rate of the glass plate can be lowered in the cooling step. Therefore, the residual stress of the arcuate glass curved plate to be manufactured can be reduced.

  In the deformation step, it is preferable to soften the glass plate by heating it while supporting both side portions of the glass plate mold in a direction perpendicular to the central axis of the mold. In this case, when the glass plate is heated, the stress applied to the portion located on the mold of the glass plate can be reduced. Therefore, damage during heating of the glass plate can be suppressed.

  In the cooling process, a pair of urging dies for columnar or cylindrical urging is pressed against both ends of the softened glass plate to urge both ends toward the center of the mold, and the deformation process It is preferable to support both ends of the glass plate using a pair of biasing molds. In this case, it is not necessary to separately provide a member for supporting both ends of the glass plate. For this reason, the structure of the manufacturing apparatus of an arc-shaped glass curved plate can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, the method which can manufacture an arc-shaped glass curved plate with a large central angle can be provided.

It is a schematic perspective view of the arcuate glass curved plate manufactured in the first embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 1st Embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 1st Embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 1st Embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 2nd Embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 2nd Embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 2nd Embodiment. It is a typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in the modification of 2nd Embodiment.

  Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiments are merely examples. The present invention is not limited to the following embodiments.

(First embodiment)
FIG. 1 is a schematic perspective view of an arcuate glass curved plate manufactured in the first embodiment. First, the arcuate glass curved plate 1 manufactured in the present embodiment will be described with reference to FIG.

  The arcuate glass curved plate 1 is a glass member having a central angle larger than 180 ° and an arcuate cross section. The length of the arcuate glass curved plate 1 is not particularly limited, but can be, for example, about 50 mm to 2000 mm. The thickness of the arcuate glass curved plate 1 is not particularly limited, but can be, for example, about 1 mm to 10 mm.

  The arcuate glass curved plate 1 is not particularly limited as long as it is made of glass. The arcuate glass curved plate 1 may be made of crystallized glass or may be made of non-crystallized glass. Hereinafter, in this embodiment, an example in which the arcuate glass curved plate 1 is made of crystallized glass will be described.

  In the present embodiment, an example in which the entire arcuate glass curved plate 1 has a cross-sectional arc shape will be described, but the present invention is not limited to this configuration. In the present invention, there may be portions that are not arc-shaped at both ends in the circumferential direction.

  Next, a method for manufacturing the arcuate glass curved plate 1 will be described with reference to FIGS.

  First, a forming die 10 (see FIG. 2) having a cylindrical outer shape is prepared. The mold 10 is arranged so that the central axis C is horizontal. Then, a flat crystalline glass plate 11 is placed on the mold 10. In this state, the crystalline glass plate 11 is softened by heating. By doing so, as shown in FIG. 3, the central portion 11a of the softened crystalline glass plate 11 is set along the outer peripheral surface 10a of the mold 10, and both end portions 11b and 11c of the softened crystalline glass plate 11 are formed. It is located below the central axis C (deformation process).

  In addition, in this embodiment, since the example which manufactures the circular-arc-shaped glass curved plate 1 which consists of crystallized glass is demonstrated, although the crystalline glass plate 11 was used, a circular-arc-shaped non-crystallized glass curved plate is produced. In this case, an amorphous glass plate may be used instead of the crystalline glass plate 11. Further, instead of the crystalline glass plate 11, for example, a curved crystalline glass plate having a circular cross section with a central angle of less than 180 ° may be used.

  Next to the deforming step, as shown in FIG. 4, both end portions 11 b and 11 c of the softened crystalline glass plate 11 not along the outer peripheral surface 10 a of the mold 10 are urged toward the center side of the mold 10. . Specifically, in this embodiment, a pair of columnar or cylindrical dies 12a and 12b for urging are pressed against both ends 11b and 11c from the outside to the inside of both ends 11b and 11c. Both end portions 11 b and 11 c are urged toward the center side of the mold 10. As a result, the upper portions 11b1 and 11c1 of the both end portions 11b and 11c that are not along the outer peripheral surface 10a in the deformation step are along the outer peripheral surface 10a. A crystallization process for crystallizing the softened crystalline glass plate 11 by further heating while maintaining the state is performed continuously with the deformation process. Then, the arc-shaped crystallized glass curved plate can be completed by cooling the crystallized glass curved plate while maintaining the biasing by the biasing molds 12a and 12b (cooling step).

  Next, the obtained crystallized glass curved plate is cut at the cut lines L1 and L2 shown in FIG. 4, and further, the arc-shaped glass curved plate 1 shown in FIG. Can do.

  According to the method for manufacturing an arcuate glass curved plate of the present embodiment described above, it is possible to easily manufacture an arcuate glass curved plate having a large central angle such that the central angle exceeds 180 °.

  Moreover, by using the crystalline glass plate 11, an arc-shaped crystallized glass curved plate having excellent heat resistance and rigidity can be manufactured. In that case, by continuously performing the deformation step and the crystallization step, it is possible to uniformly crystallize the glass shape obtained in the deformation step. Therefore, an arc-shaped crystallized glass curved plate having superior heat resistance and rigidity can be produced.

  Hereinafter, other examples of preferred embodiments of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by common reference numerals, and description thereof is omitted.

(Second Embodiment)
FIGS. 5-7 is typical side view for demonstrating the manufacturing process of the circular-arc-shaped glass curved plate in 2nd Embodiment.

  In the second embodiment, as shown in FIG. 5, in the deformation step, the glass plate 11 disposed on the mold 10 has flexibility on at least a portion in contact with the mold 10. The glass plate 11 is heated in a state where the ceramic sheet 13 is disposed. Specifically, in the present embodiment, in the deformation step, the glass plate 11 is heated in a state where the flexible ceramic sheet 13 is disposed on substantially the entire glass plate 11. Then, as shown in FIG.6 and FIG.7, the softening deformation | transformation and cooling of the glass plate 11 are performed in the state which has arrange | positioned the ceramic sheet 13 on the glass plate 11. FIG. That is, the ceramic sheet 13 is placed on the glass plate 11 until the cooling process is completed.

  The constituent material of the ceramic sheet 13 is not particularly limited as long as it is ceramic. The ceramic sheet 13 can be made of, for example, alumina, silica, or zirconia.

  The thickness of the ceramic sheet 13 is not particularly limited as long as the ceramic sheet 13 is flexible. For example, the thickness of the ceramic sheet 13 is preferably 0.5 to 3.0 mm, and more preferably 0.7 to 2.0 mm.

  By the way, when the glass plate 11 is softened by heating, the surface layer on the side of the mold 10 in contact with the mold 10 of the glass plate 11 is hardly heated by the influence of the mold 10, but opposite to the mold 10. The surface layer on the side is easily heated. For this reason, a temperature difference tends to occur between the surface layer on the side of the mold 10 in contact with the mold 10 of the glass plate 11 and the surface layer on the side opposite to the mold 10. If the temperature difference between the surface layers becomes too large, a large stress is generated in the glass plate 11 and the glass plate 11 may be damaged.

  On the other hand, in this embodiment, the glass plate 11 is heated in the state which has arrange | positioned the flexible ceramic sheet 13 on the part which is contacting the shaping | molding die 10 of the glass plate 11 at least. For this reason, the heating rate of the surface layer on the opposite side to the shaping | molding die 10 of the glass plate 11 with the ceramic sheet 13 is made low. Therefore, the temperature difference between the surface layer of the ceramic sheet 13 in contact with the mold 10 on the mold 10 side and the surface layer on the opposite side of the mold 10 can be reduced. Therefore, it can suppress that a big stress is added to the glass plate 11. FIG. As a result, breakage of the glass plate 11 during heating can be suppressed.

  Moreover, in this embodiment, the ceramic sheet 13 is arrange | positioned on the glass plate 11 until a cooling process is complete | finished. For this reason, in the cooling process, since the ceramic sheet 13 functions as a heat insulating material, the cooling rate of the glass plate 11 can be lowered. Further, in the process of cooling the glass plate 11, the temperature difference between the surface layer of the glass plate 11 in contact with the mold 10 on the mold 10 side and the surface layer opposite to the mold 10 is reduced. can do. Therefore, the residual stress of the arcuate glass curved plate 1 to be manufactured can be reduced.

  From the viewpoint of more effectively suppressing breakage of the glass plate 11, it is preferable to use a molding die having physical properties similar to those of the glass plate 11 as the molding die 10. It is preferable to lower at least one of the heating rate and the cooling rate of the glass plate 11.

  In the second embodiment, in the deformation step, the glass plate 11 is heated in a state in which both side portions of the molding die 10 of the glass plate 11 are supported in the direction perpendicular to the central axis C of the shaping die 10 (left and right direction on the paper surface). To soften. For this reason, the stress added to the part which is contacting the shaping | molding die 10 of the glass plate 11 can be made small. Therefore, breakage of the glass plate 11 in the process of heating the glass plate 11 can be suppressed.

  Further, in the present embodiment, since the biasing molds 12 a and 12 b are used for supporting the glass plate 11, it is not necessary to provide a separate member for supporting the glass plate 11. Therefore, the manufacturing apparatus of the arcuate glass curved plate 1 can be simplified.

(Modification of the second embodiment)
FIG. 8 is a schematic side view for explaining the manufacturing process of the arcuate glass curved plate in the modified example of the second embodiment.

  In the second embodiment, the example in which the ceramic sheet 13 is disposed on substantially the entire surface of the glass plate 11 has been described. On the other hand, in this modification, in the deformation process, the ceramic sheet 13 is disposed only on the central portion 11a including the portion in contact with the mold 10 of the glass plate 11 disposed on the mold 10. The glass plate 11 is heated. Even in this case, in the heating process of the glass plate 11, it becomes difficult for temperature unevenness to occur in the portion of the glass plate 11 that is in contact with the mold 10, so that breakage of the glass plate 11 can be suppressed.

DESCRIPTION OF SYMBOLS 1 ... Arc-shaped glass curved plate 10 ... Mold 10a ... Outer peripheral surface 11 ... Crystalline glass plate 11a ... Central part 11b, 11c ... End part 12a, 12b ... Biasing mold 13 ... Flexible ceramic sheet

Claims (9)

A method of producing an arcuate glass curved plate by softening and deforming a glass plate,
A mold having a cylindrical outer shape is arranged so that the central axis is horizontal, and the glass plate is softened by heating the glass plate in a state where the glass plate is arranged on the mold, and the central portion of the glass plate Along the outer peripheral surface of the mold, and a deformation step of positioning both ends of the glass plate below the center axis of the mold,
A cooling step of cooling and hardening the softened glass plate in a state where both ends of the softened glass plate not along the outer peripheral surface of the mold are biased toward the center side of the mold;
A method for manufacturing an arcuate glass curved plate.   In the cooling step, a pair of urging molds having a columnar shape or a cylindrical shape are pressed against both end portions of the softened glass plate to urge the both end portions toward the center side of the forming die. The manufacturing method of the circular-arc-shaped glass curved plate of Claim 1.   The manufacturing method of the circular-arc-shaped glass curved plate of Claim 1 or 2 which uses a glass flat plate as the said glass plate. As the glass plate, a crystalline glass plate is used,
4. The method according to claim 1, further comprising a crystallization step of crystallizing the crystalline glass plate after performing the deformation step and before cooling the softened glass plate. The manufacturing method of the circular-arc-shaped glass curved plate of description.   The manufacturing method of the circular-arc-shaped glass curved plate of Claim 4 which performs the said deformation | transformation process and the said crystallization process continuously.   In the deformation step, the glass plate is heated in a state in which a flexible ceramic sheet is disposed on at least a portion of the glass plate disposed on the mold and in contact with the mold. The manufacturing method of the circular-arc-shaped glass curved plate as described in any one of Claims 1-5.   The method for producing an arcuate glass curved plate according to claim 6, wherein the ceramic sheet is placed on the glass plate until the cooling step is completed.   The said deformation | transformation process WHEREIN: The said glass plate is softened by heating in the state which supported the both-sides part of the said mold of the said glass plate in the direction perpendicular | vertical to the center axis | shaft of the said shaping | molding die. A method for producing an arcuate glass curved plate according to one item. In the cooling step, a pair of urging molds having a columnar shape or a cylindrical shape are pressed against both end portions of the softened glass plate to urge the both end portions toward the center side of the forming die. And
The method for producing an arcuate glass curved plate according to claim 8, wherein both ends of the glass plate in the deformation step are supported using the pair of biasing molds.

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