Method for manufacturing glass articles

Abstract

To provide a method for manufacturing a glass article by which quality of the glass article can be easily enhanced.SOLUTION: A method for manufacturing a glass article comprises a curved part forming process for forming a curved part on a plate glass G1. The method for manufacturing a glass article comprises a preparation process for supporting the plate glass G1 on the support base 14. The support base 14 is provided with a first support part 15 and a second support part 16 disposed so as to be apart from the first support part 15. The first support part 15 includes a first support surface 15a supporting a first main surface G1a of the plate glass G1. The second support part 16 includes a second support surface 16a supporting a first main surface G1a of the plate glass G1. In the curved part forming process, the plate glass G1 between the first support part 15 and the second support part 16 is thermally deformed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a glass article. [Background technology]

[0002] As disclosed in Patent Documents 1 and 2, a method is known in which a glass article having a curved portion is manufactured by press-forming a glass sheet using a forming die having a concave mold and a convex mold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-043834 [Patent Document 2] International Publication No. 2020 / 095660 Summary of the Invention [Problem to be solved by the invention]

[0004] As disclosed in Patent Documents 1 and 2, when press-molding a glass sheet using a molding die, for example, minute irregularities on the molding surface of the molding die are likely to be transferred to the glass sheet. Furthermore, for example, when the glass sheet is thermally deformed by its own weight without being pressed using only a convex mold, the deformation speed of the glass sheet along the convex mold is partially accelerated, which may result in an unstable shape of the resulting glass article. Thus, there is still room for improvement in terms of improving the quality of glass articles produced with bent portions.

[0005] An object of the present invention is to provide a method for manufacturing a glass article that can easily improve the quality of the glass article. [Means for solving the problem]

[0006] A method for manufacturing a glass article that solves the above problem is a method for manufacturing a glass article that includes a bent portion forming step of forming a bent portion in a glass sheet, and includes a preparation step of supporting the glass sheet on a support base, the support base including a first support portion and a second support portion arranged at a distance from the first support portion, the first support portion and the second support portion respectively having a first support surface and a second support surface that support a main surface of the glass sheet, and in the bent portion forming step, the glass sheet between the first support portion and the second support portion is thermally deformed.

[0007] For example, if the second support portion is omitted, the glass sheet may be thermally deformed rapidly along the outer edge of the first support surface of the first support portion due to its own weight. As described above, by providing the second support surface of the second support portion on the support base, the deformation of the glass sheet along the outer edge of the first support surface of the first support portion progresses while being supported by the second support surface of the second support portion. In other words, by thermally deforming the glass sheet arranged between the first support portion and the second support portion in the bending portion forming process, it is possible to prevent the deformation speed of the glass sheet from increasing locally. This makes it possible to stabilize the shape of the bending portion.

[0008] In the above-described method for manufacturing a glass article, the support base may have a connecting portion that connects the first support portion and the second support portion. By forming the support base into an integrated product using the connecting portion that connects the first support portion and the second support portion, for example, handling of the support base becomes easier.

[0009] In the above-described method for manufacturing a glass article, the bending portion forming step may use a heat source that locally heats the glass sheet in a region between the first support portion and the second support portion. According to this method, the glass sheet is less susceptible to heat, for example, to a region supported by the first support surface of the support base. Therefore, the quality of the glass sheet before the bending portion forming step is more likely to be maintained in regions of the glass sheet that do not require thermal deformation.

[0010] In the above-described method for manufacturing a glass article, the support base may have a corner forming portion that forms a corner portion on the glass sheet in a plan view of the glass sheet. According to this method, a bent portion having a corner portion in a plan view can be formed in the bent portion forming step. In this bent portion forming step, it is also possible to suppress a partial increase in the deformation speed of the glass sheet, as described above. This makes it less likely that appearance defects such as creases will occur in the corners of the glass article.

[0011] In the method for manufacturing a glass article, the first supporting surface may be surrounded by the second supporting surface in a plan view of the glass plate. This method can produce a glass article having a frame-shaped bent portion in a plan view.

[0012] In the method for manufacturing a glass article, an area of ​​the glass sheet supported by the first support surface may be larger than an area of ​​the glass sheet supported by the second support surface. According to this method, when a glass article is obtained by removing the portion of the glass sheet supported by the second support surface as an unnecessary portion, the yield of the glass article can be increased.

[0013] The method for manufacturing a glass article may further include a cutting step of cutting the glass article obtained in the bent portion forming step, wherein the cutting step separates the portion supported by the first support surface and the portion supported by the second support surface in the glass article obtained in the bent portion forming step. This method allows for the production of a glass article having a bent portion at its outer edge. [Effects of the Invention]

[0014] The present invention exhibits the effect of easily improving the quality of glass articles. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a glass article according to an embodiment. [Figure 2]FIG. 2 is a perspective view showing a glass article according to an embodiment. [Figure 3] FIG. 3 is a perspective view showing a part of the glass article manufacturing apparatus. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. [Figure 5] FIG. 5 is a cross-sectional view illustrating a method for manufacturing a glass article. [Figure 6] FIG. 6 is a plan view illustrating the method for manufacturing a glass article. [Figure 7] FIG. 7 is a cross-sectional view illustrating a modified example of the method for manufacturing a glass article. [Figure 8] FIG. 8 is a cross-sectional view illustrating a modified example of the method for manufacturing a glass article. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, one embodiment of a method for manufacturing a glass article will be described with reference to the drawings. Note that in the drawings, for the sake of convenience, some components may be shown exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ from the actual ratios.

[0017] <Glass articles> 1 and 2, glass article 11 of this embodiment has a flat main body portion 12 and a bent portion 13 connected to main body portion 12. Main body portion 12 has a first main surface 12a and a second main surface 12b opposite to first main surface 12a. The planar shape of main body portion 12 is a rectangular rectangle.

[0018] The planar shape of the bent portion 13 of the glass article 11 is a frame shape that surrounds the outer periphery of the main body portion 12. More specifically, the bent portion 13 has a first side portion 13a, a second side portion 13b, a third side portion 13c, and a fourth side portion 13d. The first side portion 13a and the third side portion 13c are short side portions that face each other. The second side portion 13b and the fourth side portion 13d are long side portions that face each other. The bent portion 13 has four corner portions C1 that connect the ends of each side portion. The bent portion 13 protrudes toward the second main surface 12b of the main body portion 12.

[0019] Examples of the glass of the glass article 11 include alkali-free glass, alkali-containing glass, and aluminosilicate glass. The thickness of the glass article 11 is not particularly limited, but is preferably a thickness that allows for easy deformation by heat, for example, preferably 3 mm or less, and more preferably 1 mm or less. The lower limit of the thickness of the glass article 11 is also not particularly limited, but is preferably 0.1 mm or more, and more preferably 0.2 mm or more.

[0020] The glass article 11 is used, for example, as a cover member. Examples of applications of the glass article 11 include mobile terminal applications, home appliance applications, automobile applications, construction applications, aviation applications, railway applications, and marine applications.

[0021] <Glass article manufacturing equipment> Next, a manufacturing apparatus for the glass article 11 will be described. As shown in FIGS. 3 and 4, the manufacturing apparatus for a glass article 11 includes a support table 14 that supports a glass sheet G1. The glass sheet G1 has a first main surface G1a and a second main surface G1b opposite the first main surface G1a. The support table 14 includes a first support portion 15 and a second support portion 16 that is spaced apart from the first support portion 15. The first support portion 15 has a first support surface 15a that supports the first main surface G1a of the glass sheet G1. The second support portion 16 has a second support surface 16a that supports the first main surface G1a of the glass sheet G1. The second support surface 16a of the second support portion 16 is a support surface that is discontinuous with the first support surface 15a of the first support portion 15. The support table 14 has a space 14a that opens between the first support surface 15a and the second support surface 16a and is located between the first support portion 15 and the second support portion 16. Examples of materials that can be used to form the support base 14 include metals and ceramics.

[0022] In the support base 14 of this embodiment, the first support surface 15a is surrounded by the second support surface 16a in a plan view of the glass sheet G1. Such first support surfaces 15a are arranged in an island shape in a range inside the second support surface 16a in a plan view of the glass sheet G1. The area of ​​the glass sheet G1 supported by the first support surface 15a is larger than the area of ​​the glass sheet G1 supported by the second support surface 16a. The area of ​​the glass sheet G1 supported by the first support surface 15a is preferably 1.1 times or more, more preferably 1.2 times or more, and even more preferably 1.5 times or more, the area of ​​the glass sheet G1 supported by the second support surface 16a.

[0023] The first support surface 15a and the second support surface 16a of the support base 14 are preferably flat surfaces. The difference in height between the first support surface 15a and the second support surface 16a is preferably 1.2 mm or less. Most preferably, the difference in height between the first support surface 15a and the second support surface 16a is 0 mm, that is, the first support surface 15a and the second support surface 16a are arranged on the same plane.

[0024] The first support surface 15a has a rectangular shape in a plan view. The second support surface 16a has a rectangular frame shape in a plan view of the glass sheet G1. The support base 14 has four corner forming portions 14b that form corners on the glass sheet G1 in a plan view of the glass sheet G1. Each corner forming portion 14b has an outer edge corner forming portion C2 on the first support portion 15 side and an inner edge corner forming portion C3 on the second support portion 16 side in a plan view of the glass sheet G1.

[0025] The support base 14 has a connecting portion 17 that connects the first support portion 15 and the second support portion 16. In Fig. 4, the boundary between the first support portion 15 and the connecting portion 17 and the boundary between the second support portion 16 and the connecting portion 17 are indicated by two-dot chain lines. The connecting portion 17 of the support base 14 has an inner bottom surface 17a that is disposed between the first support portion 15 and the second support portion 16.

[0026] The first support portion 15 has a first exhaust hole H1 that opens to the first support surface 15a. The first exhaust hole H1 of the first support portion 15 is connected to an exhaust device such as a pump (not shown). Gas present between the first support surface 15a and the glass sheet G1 can be exhausted through the first exhaust hole H1. This allows the glass sheet G1 to be adsorbed onto the first support surface 15a.

[0027] The second support portion 16 has a second exhaust hole H2 that opens to the second support surface 16a. The second exhaust hole H2 of the second support portion 16 is also connected to an exhaust device such as a pump (not shown). Gas present between the second support surface 16a and the glass sheet G1 can be exhausted through the second exhaust hole H2. This allows the glass sheet G1 to be adsorbed onto the second support surface 16a.

[0028] The number of the first exhaust hole H1 and the number of the second exhaust holes H2 may each be one or more. Preferably, a plurality of the second exhaust holes H2 are provided so as to respectively apply suction to positions adjacent to each side of the glass sheet G1. For example, the second support portion 16 of this embodiment has four second exhaust holes H2 so as to respectively apply suction to positions adjacent to each of the four sides of the glass sheet G1.

[0029] As shown in FIG. 5 , the manufacturing apparatus for the glass article 11 includes a heat source 18 for heating and deforming the glass sheet G1. The heat source 18 of this embodiment locally heats the glass sheet G1 corresponding to the area between the first support member 15 and the second support member 16. To locally heat the glass sheet G1 in this manner, for example, the heat source 18 may be arranged along the periphery of the first support surface 15a of the first support member 15 in a plan view of the glass sheet G1. The heat source 18 of this embodiment is arranged to heat the glass sheet G1 from the side of the glass sheet G1 opposite the support base 14. The heat source 18 is, for example, a burner that sprays a flame FL. The use of a burner allows the glass sheet G1 to be softened relatively quickly. The heating method of the heat source 18 may be, for example, resistance heating or laser heating. The heat source 18 may also be superheated steam. Furthermore, the heat source 18 may be configured by combining heat sources of different heating methods. In particular, by using superheated steam as the heat source 18, the glass sheet G1 can be heated efficiently.

[0030] <Method of manufacturing glass articles> Next, a method for manufacturing the glass article 11 will be described together with its main functions. The manufacturing method of the glass article 11 includes a preparation step and a bent portion forming step. As shown in Figures 3 and 4, in the preparation step, the glass sheet G1 is supported on the support base 14. As shown in Figure 5, in the bent portion forming step, the glass sheet G1 between the first support portion 15 and the second support portion 16 of the support base 14 is thermally deformed.

[0031] More specifically, in the preparation step, the glass sheet G1 is arranged so as to straddle the first support portion 15 and the second support portion 16 of the support base 14. As a result, a portion of the glass sheet G1 is arranged between the first support portion 15 and the second support portion 16 in a plan view of the glass sheet G1. The space 14a between the first support portion 15 and the second support portion 16 of the support base 14 allows thermal deformation of the glass sheet G1. Therefore, in the bending portion forming step, the glass sheet G1 arranged between the first support surface 15a and the second support surface 16a can be thermally deformed so as to bulge into the space 14a.

[0032] Here, for example, if the second support portion 16 were omitted, the glass sheet G1 would be susceptible to rapid thermal deformation due to its own weight along the outer edge of the first support surface 15a of the first support portion 15. As described above, since the support base 14 includes the second support surface 16a of the second support portion 16, deformation of the glass sheet G1 along the outer edge of the first support surface 15a of the first support portion 15 proceeds while being supported by the second support surface 16a of the second support portion 16. That is, in the bending portion forming process, thermal deformation of the glass sheet G1 disposed between the first support portion 15 and the second support portion 16 can prevent the deformation speed of the glass sheet G1 from increasing locally. This makes it possible to stabilize the shape of the bending portion 13.

[0033] 5 and 6, a semi-finished product, glass article G2, is obtained by the bent portion forming step. The glass article G2 has a first main surface G2a disposed on the support base 14 side and a second main surface G2b opposite the first main surface G2a. The glass article G2 has a bent portion G2c located inside the outer periphery of the glass article G2. The bent portion G2c of the glass article G2 extends along the outer periphery of the glass article G2 and has a cross-sectional shape that is convex toward the first main surface G2a of the glass article G2.

[0034] The method for manufacturing glass article 11 of this embodiment further includes a cutting step of cutting glass article G2 obtained in the bending portion forming step. The glass article G2 is cut along cutting line L shown by a dashed line in FIG. 6 to remove unnecessary portion P shown by a dashed two-dot line. The cutting step can be performed using, for example, a cutting blade, laser light, or the like. This allows the glass article 11 shown in FIGS. 1 and 2 to be obtained. The method for manufacturing glass article 11 may further include, for example, a polishing step of polishing the outer peripheral edge surface of glass article 11 after the cutting step, a cleaning step of cleaning glass article 11, etc.

[0035] <Action and effect> Next, the operation and effects of this embodiment will be described. (1) The manufacturing method of the glass article 11 includes a preparation step of supporting the glass sheet G1 on a support table 14 and a bent portion forming step of forming the bent portion 13 in the glass sheet G1. The support table 14 includes a first support portion 15 and a second support portion 16 spaced apart from the first support portion 15. The first support portion 15 has a first support surface 15a that supports the first main surface G1a of the glass sheet G1. The second support portion 16 has a second support surface 16a that supports the first main surface G1a of the glass sheet G1. In the bent portion forming step, the glass sheet G1 disposed between the first support portion 15 and the second support portion 16 is thermally deformed. This method, as described above, makes it possible to stabilize the shape of the bent portion 13. Therefore, the quality of the glass article 11 can be easily improved.

[0036] (2) In the manufacturing method of glass article 11, support base 14 has connecting portion 17 that connects first support portion 15 and second support portion 16. By making support base 14 into an integrated product using connecting portion 17 that connects first support portion 15 and second support portion 16 in this manner, for example, handling of support base 14 becomes easier. Also, for example, the distance between first support surface 15a and second support surface 16a can be set in advance.

[0037] (3) In the bent portion forming step in the manufacturing method of the glass article 11, a heat source 18 is used to locally heat the glass sheet G1 corresponding to the area between the first support portion 15 and the second support portion 16 of the support base 14. In this case, the portion of the glass sheet G1 supported by, for example, the first support surface 15a of the support base 14 is less susceptible to heat. Therefore, in the portion of the glass sheet G1 that does not require thermal deformation, the quality of the glass sheet G1 before the bent portion forming step is more likely to be maintained. Therefore, the quality of the portion of the glass article 11 other than the bent portion 13 can be easily maintained.

[0038] (4) In the manufacturing method of the glass article 11, the support base 14 has a corner forming portion 14b that forms a corner portion on the glass sheet G1 in a planar view of the glass sheet G1. In this case, in the bending portion forming step, a bent portion 13 having a corner portion C1 in a planar view can be formed. In this bending portion forming step, it is also possible to prevent the deformation speed of the glass sheet G1 from increasing locally. Therefore, appearance defects such as creases are less likely to occur at the corner portion C1 of the bent portion 13. Therefore, the quality of the glass article 11 having the corner portion C1 can be easily improved.

[0039] (5) In the method for manufacturing glass article 11, first supporting surface 15a is surrounded by second supporting surface 16a in a plan view of glass sheet G1. In this case, glass article 11 having bent portion 13 that is frame-shaped in a plan view can be obtained.

[0040] (6) In the method for manufacturing glass article 11, the area of ​​first supporting surface 15a is larger than the area of ​​second supporting surface 16a. According to this method, when glass article 11 is obtained by removing the portion of plate glass G1 supported by second supporting surface 16a as unnecessary portion P, the yield of glass article 11 can be increased.

[0041] (7) The method for manufacturing glass article 11 further includes a cutting step of cutting glass article G2 obtained in the bent portion forming step. In this cutting step, the portion of glass article G2 supported by first support surface 15a and the portion supported by second support surface 16a are separated. In this case, glass article 11 having bent portion 13 on its outer edge can be obtained.

[0042] <Example of change> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0043] The manufacturing method of the glass article 11 can be changed to a method for manufacturing a semi-finished glass article G2, in which the cutting step of the above embodiment is omitted.

[0044] In the method for manufacturing glass article 11, the area of ​​glass sheet G1 supported by first supporting surface 15a may be the same as the area of ​​glass sheet G1 supported by second supporting surface 16a. In the method for manufacturing glass article 11, the area of ​​glass sheet G1 supported by first supporting surface 15a may be smaller than the area of ​​glass sheet G1 supported by second supporting surface 16a.

[0045] In the manufacturing method of the glass article 11, the first supporting surface 15a is surrounded by the second supporting surfaces 16a in a plan view of the glass sheet G1, but the second supporting surfaces 16a may be arranged adjacent to each other without being surrounded by the second supporting surfaces 16a. In other words, the bent portion forming step may be a step of forming bent portions in the glass sheet G1, for example, only along two adjacent sides.

[0046] In the manufacturing method of the glass article 11, the corner forming portions 14b of the support base 14 may be omitted. That is, the bent portion forming step may be a step of forming bent portions along only two opposing sides of the glass sheet G1, or a step of forming bent portions along only one side.

[0047] The planar shape of the main body 12 of the glass article 11 is not limited to a rectangular shape, and may be a polygonal shape other than a rectangular shape, a circle, an ellipse, etc. The planar shape of the bent portion 13 of the glass article 11 can also be changed depending on, for example, the planar shape of the main body 12 and the use of the glass article.

[0048] The planar shape of the glass sheet G1 is not limited to a rectangular shape, but may be a polygonal shape other than a rectangular shape, a circular shape, an elliptical shape, or the like. The bent portion forming step in the manufacturing method of the glass article 11 may be a step of thermally deforming the glass sheet G1 between the first support portion 15 and the second support portion 16 by heating the entire glass sheet G1.

[0049] In the bent portion forming step of the manufacturing method of the glass article 11, the glass sheet G1 is heated from the side of the glass sheet G1 placed on the support table 14, but the glass sheet G1 can also be heated from the side of the support table 14. Note that in the bent portion forming step, the glass sheet G1 may be heated from both the glass sheet G1 side and the support table 14 side.

[0050] In the bending portion forming step of the manufacturing method of the glass article 11, by partially covering the second main surface G1b of the glass sheet G1 with a heat insulating member, the glass sheet G1 can be locally heated corresponding to the area between the first support portion 15 and the second support portion 16. However, by making the second main surface G1b of the glass sheet G1 an exposed surface that does not come into contact with other members, as in the above embodiment, it is possible to easily prevent scratches from occurring on the second main surface G1b of the glass sheet G1, for example.

[0051] An external force generator may be used to apply an external force to the glass sheet G1 in the bent portion forming step of the manufacturing method for the glass article 11. By using the external force generator, it is possible to control the thermal deformation of the glass sheet G1 and stabilize the shape of the bent portion 13.

[0052] Examples of the external force generator include a pressing mechanism including a pressing member that presses the glass sheet G1, a high-pressure gas generator that sprays high-pressure gas toward the glass sheet G1, and a suction mechanism that suctions the space 14a of the support base 14. For example, as shown in FIGS. 7 and 8 , the bending process may include a first stage in which the glass sheet G1 is heated and a second stage in which an external force is applied to the heated glass sheet G1 using a pressing member 19 of the pressing mechanism. The pressing member 19 presses the glass sheet G1 so as to press a portion of the glass sheet G1 between the first support portion 15 and the second support portion 16. At this time, it is preferable that the pressing member 19 contact only the unnecessary portion of the glass sheet G1. Note that the pressing mechanism including the pressing member 19 may be a mechanism that moves the support base 14 toward the pressing member 19. Alternatively, the first stage in which the glass sheet G1 is heated and the second stage in which the external force is applied using the pressing member 19 may be performed simultaneously.

[0053] Furthermore, for example, although not shown, by spraying high-pressure gas onto a portion of the glass sheet G1 using a high-pressure gas generator, the glass sheet G1 can be pressed so as to push the portion of the glass sheet G1 between the first support portion 15 and the second support portion 16. Furthermore, for example, although not shown, by sucking the space portion 14a of the support base 14 using a suction mechanism, the portion of the glass sheet G1 can be pulled into between the first support portion 15 and the second support portion 16.

[0054] Furthermore, for example, although not shown, by using superheated steam as the heat source 18 and shortening the distance between the steam injection port and the glass sheet G1, it is possible to simultaneously heat and press the glass sheet G1.

[0055] In the method for manufacturing the glass article 11, the connecting portion 17 of the support base 14 may be omitted. That is, the inner bottom surface 17a between the first support portion 15 and the second support portion 16 of the support base 14 may be omitted.

[0056] In the method for manufacturing the glass article 11, at least one of the first exhaust hole H1 and the second exhaust hole H2 of the support base 14 may be omitted. The support base 14 in the above embodiment may be changed to a support base including a plurality of first support portions 15 and a plurality of second support portions 16. This makes it possible to produce a plurality of glass articles 11 from one or a plurality of glass sheets G1. Also, by changing the support base in this way, it is possible to produce a glass article having a plurality of bent portions.

[0057] The above-described preparation step and the bent portion forming step may be repeated for one glass sheet G1. This allows a plurality of glass articles 11 to be produced from one glass sheet G1. It is also possible to produce glass articles having a plurality of bent portions. [Explanation of symbols]

[0058] 11, G2...Glass items 13, G2c...Bent section 14...Support stand 14b...Corner forming section 15...First support part 15a...first support surface 16…Second support part 16a…Second support surface 17...Connection part 18...Heating source C1: Corner section G1...Plate glass G1a...First principal surface

Claims

1. A method for manufacturing a glass article, comprising a bent portion forming step of forming a bent portion in a glass sheet, a preparation step of supporting the glass sheet on a support base, The support base includes a first support portion and a second support portion disposed apart from the first support portion, The first support portion and the second support portion respectively have a first support surface and a second support surface that support a main surface of the glass sheet, In the bending portion forming process, the glass plate between the first support portion and the second support portion is simultaneously heated and pressed using superheated steam, thereby thermally deforming the glass plate between the first support portion and the second support portion.

2. The method for manufacturing a glass article according to claim 1 , wherein the support base has a connecting portion that connects the first support portion and the second support portion.

3. 3. The method for manufacturing a glass article according to claim 1, wherein in the bent portion forming step, the glass plate is locally heated and pressed using the superheated steam in a region corresponding to a region between the first support portion and the second support portion.

4. The method for manufacturing a glass article according to claim 1 , wherein the support base has a corner forming portion that forms a corner on the glass plate in a plan view of the glass plate.

5. The method for manufacturing a glass article according to claim 4 , wherein the first support surface is surrounded by the second support surface in a plan view of the glass plate.

6. The method for manufacturing a glass article according to any one of claims 1 to 5, wherein an area of ​​the glass plate supported by the first support surface is larger than an area of ​​the glass plate supported by the second support surface.

7. The glass article obtained in the bent portion forming step is further provided with a cutting step.

7. The method for manufacturing a glass article according to claim 1, wherein in the cutting step, a portion supported by the first support surface and a portion supported by the second support surface are separated from each other in the glass article obtained in the bent portion forming step.

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