JP2013256423A - Method for producing glass plate having bent portion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method by which a glass plate having bent portions can be produced, the glass plate having the bent portions and flat plate portions having high flatness and smoothness.SOLUTION: Heat insulating materials 31, 32 are brought into contact with at least one principal surface of a first portion 21 of a flat glass plate 20, and molds 40a, 40b provided with heaters 41 are brought into contact with at least one principal surface of each of second portions 22a, 22b of the flat glass plate 20, whereby the second portions 22a, 22b and adjacent portions 23a, 23b adjacent to the second portions 22a, 22b are heated, and then the adjacent portions 23a, 23b are bent by pressing with pressing tools 51, 52 to form bent portions 14, 15.

Description

  The present invention relates to a method for producing a glass plate having a bent portion.

  In recent years, panel-type mobile display devices such as smartphones and tablet personal computers (tablet PCs) are rapidly spreading. Generally, a glass plate is used on the front surface of a panel-like mobile display device.

JP 2010-30859 A

  For the purpose of improving the aesthetics of the panel-like mobile display device, for example, there is a desire to cover the front and side surfaces of the panel-like mobile display device with a single glass plate. In such a case, a glass plate having at least one flat plate portion and a bent portion is required.

  As a method for producing a glass plate having a bent portion, for example, as described in Patent Document 1, a method of press-molding a glass flat plate is conceivable. However, when press molding is performed, the entire glass flat plate is heated to the softening point or higher and the whole is pressed using a mold. For this reason, the flatness and smoothness of the flat plate portion of the obtained glass plate tend to be low.

  The main object of the present invention is to provide a method capable of producing a glass plate having a bent portion in which flatness and smoothness of a flat plate portion are high.

  The manufacturing method of the glass plate which has a bending part which concerns on this invention is related with the manufacturing method of the glass plate which has a flat plate part and the bending part connected to the flat plate part. In the manufacturing method of the glass plate which has a bending part which concerns on this invention, while making a heat insulating material contact at least one main surface of the 1st part of a glass flat plate, it is on at least one main surface of the 2nd part of a glass flat plate. Then, the second part and the adjacent part adjacent to the second part are heated by contacting a mold having a heater, and then the adjacent part is pressed and bent using a pressing tool to form a bent part.

  In the manufacturing method of the glass plate which has a bending part which concerns on this invention, it is preferable to press by a press tool in the state which heated the adjacent part to the temperature below the softening point of a glass flat plate.

  In the manufacturing method of the glass plate which has a bending part which concerns on this invention, it is preferable that a heat insulating material has a through-hole and heats and presses, sending a coolant into a through-hole.

  In the method for manufacturing a glass plate having a bent portion according to the present invention, the first portion is sandwiched between two heat insulating materials, and the second portion is sandwiched between two molds and heated and pressed. preferable.

  In the manufacturing method of the glass plate which has a bending part which concerns on this invention, it is preferable that the heat conductivity of a heat insulating material is lower than the heat conductivity of a shaping | molding die.

  In the manufacturing method of the glass plate which has a bending part which concerns on this invention, it is preferable that the heat insulating material is comprised with ceramics.

  In the manufacturing method of the glass plate which has a bending part which concerns on this invention, it is preferable that the press tool is comprised with ceramics.

  In the manufacturing method of the glass plate which has a bending part which concerns on this invention, it is preferable to pre-heat a press tool prior to the press using a press tool.

  ADVANTAGE OF THE INVENTION According to this invention, the method which can manufacture the glass plate which has the flatness and smoothness of a flat plate part and which has a bending part can be provided.

It is schematic-drawing sectional drawing for demonstrating the manufacturing process of the glass plate which has a bending part in one Embodiment of this invention. It is schematic-drawing sectional drawing for demonstrating the manufacturing process of the glass plate which has a bending part in one Embodiment of this invention. It is a schematic perspective view of the glass plate which has the bending part manufactured in one Embodiment of this invention.

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

  Moreover, in each drawing referred in embodiment etc., the member which has a substantially the same function shall be referred with the same code | symbol. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.

  In this embodiment, it is related with the manufacturing method of the glass plate 1 shown in FIG. The glass plate 1 has first to third flat plate portions 11 to 13 and first and second bent portions 14 and 15. The edge portion on one side in the width direction of the first flat plate portion 11 and the second flat plate portion 12 are connected by a first bent portion 14. The edge portion on the other side in the width direction of the first flat plate portion 11 and the third flat plate portion 13 are connected by a second bent portion 15. For example, the first and second bent portions 14 and 15 may have a cross-sectional arc shape, a cross-sectional elliptical arc shape, or the like.

  The use of the glass plate 1 is not particularly limited. The glass plate 1 can be used as a housing of a panel type mobile display device such as a smartphone or a tablet personal computer (tablet PC). When used for such an application, the thickness of the glass plate 1 can be, for example, about 0.3 mm to 2.0 mm.

  The composition of the glass which comprises the glass plate 1 is not specifically limited, According to the characteristic requested | required of the glass plate 1, it can select suitably. The glass plate 1 can be composed of, for example, silicate glass or borosilicate glass.

  Next, the manufacturing method of the glass plate 1 in this embodiment is demonstrated, mainly referring FIG.1 and FIG.2.

  First, a glass flat plate 20 shown in FIG. 1 is prepared. The glass flat plate 20 is a glass plate for constituting the glass plate 1. The thickness of the glass flat plate 20 is substantially equal to the thickness of the glass plate 1.

  In the present embodiment, the heat insulating materials 31 and 32 are brought into contact with at least one main surface of the first portion 21 of the glass flat plate 20, and at least one main surface of the second portions 22a and 22b of the glass flat plate 20 is contacted. The molds 40a and 40b having the heater 41 are brought into contact with each other. Thus, the second portions 22a and 22b and the adjacent portions 23a and 23b adjacent to the second portions 22a and 22b are heated. After that, the adjacent portions 23a and 23b are bent by pressing the adjacent portions 23a and 23b or the portions outside the adjacent portions 23a and 23b that are heated by using the pressing tools 51 and 52. Thereby, the glass plate 1 which has the bending parts 14 and 15 comprised from the adjacent parts 23a and 23b and the 1st flat plate part 11 comprised from the 1st and 2nd parts 21, 22a, and 22b is obtained. Can do.

  Hereinafter, the manufacturing method of the glass plate 1 is demonstrated in detail. First, the molds 40a and 40b and the heat insulating materials 31 and 32 used for manufacturing the glass plate 1 will be described.

  The molding die 40a and the molding die 40b are arranged so as to face each other. A heat insulating material 31 is embedded in the center of the surface of the mold 40a facing the mold 40b. On the other hand, a heat insulating material 32 is embedded in the central portion of the surface of the mold 40b facing the mold 40a. These heat insulating materials 31 and 32 are members that suppress the transmission of heat to the glass flat plate 20. The heat insulating materials 31 and 32 have a lower thermal conductivity than the molds 40a and 40b. It is preferable that the heat conductivity of the heat insulating materials 31 and 32 is 1/10 or less of the heat conductivity of the shaping | molding die 40a, 40b, and it is more preferable that it is 1/20 or less. For example, when the molds 40a and 40b are made of metal, the heat insulating materials 31 and 32 can be made of ceramics mainly composed of alumina, silicon carbide, diatomaceous earth, or the like.

  Each of the heat insulating materials 31 and 32 is provided with at least one through hole 31a and 32a. A coolant such as air is fed into the through holes 31a and 32a at the time of molding. Thereby, the temperature of the heat insulating materials 31 and 32 can be adjusted. For example, an undesired temperature increase of the heat insulating materials 31 and 32 can be suppressed.

  In the present embodiment, an example in which through holes into which coolant is fed is provided in both of the two heat insulating materials has been described. However, the present invention is not limited to this configuration. The through hole may be provided only in one of the two heat insulating materials, or the through hole may not be provided in both of the two heat insulating materials.

  A heater 41 is embedded in the molds 40a and 40b. Specifically, the heater 41 is embedded in the vicinity of the surface in contact with the glass flat plate 20 of the molds 40a and 40b.

  In forming the glass flat plate 20, first, the glass flat plate 20 is disposed between the forming die 40a and the heat insulating material 31, and the forming die 40b and the heat insulating material 32, and the forming die 40a, the heat insulating material 31, the forming die 40b, and the heat insulating material. And 32 hold the glass flat plate 20.

  The portion sandwiched by the heat insulating materials 31 and 32 of the glass flat plate 20 constitutes the first portion 21. The portions sandwiched by the molds 40a and 40b of the glass flat plate 20 constitute the second portions 22a and 22b. The portions of the glass flat plate 20 adjacent to the second portions 22a and 22b and located on the opposite side of the first portion 21 with respect to the second portions 22a and 22b constitute the adjacent portions 23a and 23b. To do.

  The heater 41 is driven and the molds 40a and 40b are heated in a state where the glass plate 20 is held between the mold 40a and the heat insulating material 31, the mold 40b and the heat insulating material 32 (heating process).

  After that, as shown in FIG. 2, the adjacent portions 23a, 23b or the portions outside the adjacent portions 23a, 23b are pressed by using the pressing tools 51, 52 provided on both sides of the molds 40a, 40b. The parts 23a and 23b are bent (molding process). Thereby, the glass plate 1 shown by FIG. 3 can be obtained.

  In addition, the press tools 51 and 52 are not specifically limited as long as the glass flat plate 20 can be pressed suitably. The press tools 51 and 52 may be configured by, for example, a rod-shaped body.

  As described above, in the present embodiment, the heating step and the deformation step are performed in a state where the first portion 21 of the glass flat plate 20 is in contact with the heat insulating materials 31 and 32. For this reason, it can suppress that the temperature of the 1st part 21 rises in a heating process and a formation process. Even when the adjacent portions 23a and 23b reach a deformable temperature, the temperature of the first portion 21 can be kept constant so that the surface state does not change. Therefore, the glass plate 1 with high flatness and smoothness of the first flat plate portion 11 can be manufactured.

  From the viewpoint of more effectively suppressing the temperature rise of the first portion 21, the pressing by the pressing tools 51 and 52 is performed while the adjacent portions 23 a and 23 b are heated to a temperature equal to or lower than the softening point of the glass flat plate 20. Is preferred. That is, it is preferable that the temperature of the adjacent portions 23 a and 23 b does not become higher than the softening point of the glass flat plate 20.

  Moreover, it is preferable to send a coolant into the through holes 31 a and 32 a to suppress the temperature rise of the heat insulating materials 31 and 32.

  Moreover, it is preferable that the press tools 51 and 52 are comprised with heat insulating materials, such as a ceramic material, from a viewpoint of improving the flatness and smoothness of the 2nd and 3rd flat plate parts 12 and 13. FIG. Further, from the viewpoint of preventing breakage due to thermal shock, it is preferable to preheat the pressing tools 51 and 52 to a temperature close to the temperature of the glass flat plate 20 prior to pressing.

  The shapes of the bent portions 14 and 15 are roughly determined by the shape of the corner of the mold 40b. For this reason, the shape of the bending parts 14 and 15 can be easily changed by changing the shape of the corner | angular part of the shaping | molding die 40b suitably.

  In addition, although this embodiment demonstrated the example in which the bending parts 14 and 15 were provided in the both sides of the 1st flat plate part 11, this invention is not limited to this. The glass plate manufactured by this invention may have only one bending part.

DESCRIPTION OF SYMBOLS 1 ... Glass plate 11 ... 1st flat plate part 12 ... 2nd flat plate part 13 ... 3rd flat plate part 14 ... 1st bending part 15 ... 2nd bending part 20 ... Glass flat plate 21 ... 1st part 22a 22b ... second part 23a, 23b ... adjacent part 31,32 ... insulating material 31a, 32a ... through hole 40a, 40b ... mold 41 ... heater 51, 52 ... pressing tool

Claims (8)

A method for producing a glass plate having a flat plate portion and a bent portion connected to the flat plate portion,
The heat insulating material is brought into contact with at least one main surface of the first portion of the glass flat plate, and at least one main surface of the second portion of the glass flat plate is brought into contact with a mold having a heater. A method for manufacturing a glass plate having a bent portion, wherein the bent portion is formed by heating the adjacent portion adjacent to the second portion and the second portion and then pressing and bending the adjacent portion using a pressing tool.   The manufacturing method of the glass plate which has a bending part of Claim 1 which presses with the said press tool in the state which heated the said adjacent part to the temperature below the softening point of the said glass flat plate.   The said heat insulating material has a through-hole, The manufacturing method of the glass plate which has a bending part of Claim 1 or 2 which performs the said heating and pressing, sending a coolant into the said through-hole.   The heating and pressing are performed in a state where the first portion is sandwiched between the two heat insulating materials and the second portion is sandwiched between the two molds. The manufacturing method of the glass plate which has a bending part of description.   The manufacturing method of the glass plate which has a bending part as described in any one of Claims 1-4 whose heat conductivity of the said heat insulating material is lower than the heat conductivity of the said shaping | molding die.   The manufacturing method of the glass plate which has a bending part as described in any one of Claims 1-5 with which the said heat insulating material is comprised with ceramics.   The manufacturing method of the glass plate which has a bending part as described in any one of Claims 1-6 with which the said press tool is comprised with ceramics.   The manufacturing method of the glass plate which has a bending part as described in any one of Claims 1-7 which preheats the said press tool prior to the press using the said press tool.

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