JP2014169192A - Production method of crystallized glass bent plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of producing a crystallized glass bent plate having an excellent surface property.SOLUTION: In the state where a crystalline glass bent plate 20 is placed on a flexible ceramic paper 13 supported by a first support member 11 and a second support member 12 and having a bent part 13c separated from the first and second support members 11, 12, the crystalline glass bent plate 20 is heated and crystallized to thereby produce a crystallized glass bent plate 20. The crystalline glass bent plate 20 is placed on the flexible ceramic paper 13 so that a bent part 23c of the crystalline glass bent plate 20 has a contact with the bent part 13c of the flexible ceramic paper 13.

Description

  The present invention relates to a method for producing a crystallized glass curved plate.

  Conventionally, a crystallized glass curved plate having high heat resistance is used for applications such as a heat-resistant glass plate for a stove. For example, as described in Patent Document 1, a crystallized glass curved plate is obtained by placing a crystalline glass flat plate on a mold having a surface corresponding to the shape of the crystallized glass curved plate to be obtained. And it is manufactured by deforming and crystallizing by heat treatment.

JP 2012-091995 A

  In the production method described in Patent Document 1, in the step of heating and crystallizing the crystalline glass curved plate, the surface shape of the mold material is transferred to the surface of the heated crystalline glass curved plate, and excellent surface properties are obtained. There is a problem that it is difficult to obtain a crystallized glass curved plate having the following.

  The main object of the present invention is to provide a method capable of producing a crystallized glass curved plate having excellent surface properties.

  In the method for producing a crystallized glass curved plate according to the present invention, the crystallized glass curved plate is supported by the first support member and the second support member, and has a bent portion that is separated from the first and second support members. In a state where the crystalline glass curved plate is placed on the flexible ceramic paper, the crystallized glass curved plate is produced by heating and crystallizing the crystalline glass curved plate.

  In the method for producing a crystallized glass curved plate according to the present invention, the crystalline glass curved plate is placed on the flexible ceramic paper so that the bent portion of the crystalline glass curved plate is in contact with the bent portion of the flexible ceramic paper. It is preferable to mount it.

  In the method for producing a crystallized glass curved plate according to the present invention, the first support member has a first support surface that extends obliquely downward toward the second support member side and supports the flexible ceramic paper. You may do it. The second support member may have a second support surface that extends obliquely downward toward the first support member side and supports the flexible ceramic paper. In that case, a first portion supported by the first support surface, a second portion supported by the second support surface, and a bent portion connecting the first portion and the second portion. It is preferable to place a crystalline glass curved plate on a flexible ceramic paper having the following.

  In the method for producing a crystallized glass curved plate according to the present invention, it is preferable that the first support member and the second support member are integrally provided.

  In the method for producing a crystallized glass curved plate according to the present invention, the radius of curvature of the bent portion of the crystallized glass curved plate is preferably 5 mm or more.

  ADVANTAGE OF THE INVENTION According to this invention, the method which can manufacture the crystallized glass curved plate which has the outstanding surface property can be provided.

It is a schematic sectional drawing for demonstrating the manufacturing method of the crystallized glass curved plate in one Embodiment of this invention. It is a schematic perspective view of the crystallized glass curved plate manufactured in one Embodiment of this invention. It is schematic-drawing sectional drawing for demonstrating the manufacturing method of the crystallized glass curved plate in a 1st reference example. It is schematic-drawing sectional drawing for demonstrating the manufacturing method of the crystallized glass curved plate in a 2nd reference example. It is schematic-drawing sectional drawing for demonstrating the manufacturing method of the crystallized glass curved plate in a 1st modification. It is schematic-drawing sectional drawing for demonstrating the manufacturing method of the crystallized glass curved plate in a 2nd modification.

  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.

  FIG. 1 is a schematic cross-sectional view for explaining a method for producing a crystallized glass curved plate in the present embodiment. FIG. 2 is a schematic perspective view of a crystallized glass curved plate manufactured in the present embodiment. In the present embodiment, a method for manufacturing the crystallized glass curved plate 1 shown in FIG. 2 will be described.

  The crystallized glass curved plate 1 is made of crystallized glass. The crystallized glass constituting the crystallized glass curved plate 1 is not particularly limited. The crystallized glass constituting the crystallized glass curved plate 1 may contain, for example, at least one of α-quartz solid solution and β-spodumene solid solution as precipitated crystals.

  Although the thickness of the crystallized glass curved plate 1 is not specifically limited, For example, it can be set as about 1 mm-10 mm.

  The crystallized glass curved plate 1 has a first flat plate portion 1a, a second flat plate portion 1b, and a bent portion 1c. The bent portion 1c connects the first flat plate portion 1a and the second flat plate portion 1b. The curvature radius of the bent portion 1c is preferably 5 mm or more, and more preferably 20 mm or more. In addition, when the bending part 1c is not circular arc shape, the curvature radius of the bending part 1c is a curvature radius at the time of approximating the bending part 1c to circular arc shape.

  In the present invention, the crystallized glass curved plate only needs to have a bent portion, and does not necessarily have a flat portion. That is, the crystallized glass curved plate may be constituted only by a bent portion. In the present invention, “bending” includes “curving”.

  Next, a method for manufacturing the crystallized glass curved plate 1 will be described mainly with reference to FIG.

  First, the molding apparatus 10 shown in FIG. 1 is prepared. The forming apparatus 10 includes a first support member 11, a second support member 12, and a flexible ceramic paper 13. In the present embodiment, the first support member 11 and the second support member 12 are provided integrally. For this reason, the relative positional relationship between the first support member 11 and the second support member 12 is unlikely to change.

  The first support member 11 is provided in a plate shape. The first support member 11 extends obliquely downward toward the second support member 12 side. The first support member 11 has a planar first support surface 11a extending obliquely downward toward the second support member 12 side. Accordingly, the first support member 11 has a function as a support member for the ceramic paper 13 and the crystalline glass curved plate 20 described later.

  The second support member 12 is provided in a plate shape. The second support member 12 extends obliquely downward toward the first support member 11 side. The second support member 12 has a planar second support surface 12a extending obliquely downward toward the first support member 11 side. Therefore, the second support member 12 also has a function as a support member of the ceramic paper 13. The lower end portion of the second support member 12 is connected to the lower end portion of the first support member 11. For this reason, the first support surface 11a and the second support surface 12a are substantially V-shaped in a side view.

  The constituent materials of the first and second support members 11 and 12 are not particularly limited as long as they can provide sufficiently high heat resistance to the first and second support members 11 and 12. The first and second support members 11 and 12 can be made of, for example, refractory ceramics, heat resistant glass (such as heat resistant crystallized glass), metal, or the like.

  The ceramic paper 13 is supported by the first support member 11 and the second support member 12. Specifically, one end portion of the ceramic paper 13 is fixed to the upper end portion of the first support member 11 by a fixing tool 14 a, and the other end portion is fixed to the upper end portion of the second support member 12. It is fixed by a fixing tool 14b. Other portions of the ceramic paper 13 are not fixed to the first and second support members 11 and 12. That is, portions of the ceramic paper 13 other than the fixing portions (fixing tools 14 a and 14 b) with respect to the first and second support members 11 and 12 can be displaced with respect to the first and second support members 11 and 12. .

  The ceramic paper 13 includes a flat plate-like first portion 13a supported by the first support surface 11a, a flat plate-like second portion 13b supported by the second support surface 12a, and a first It has the bending part 13c which has connected the part 13a and the 2nd part 13b. The bent portion 13 c is separated from the first and second support members 11 and 12. For this reason, the bending part 13c is deformable.

  The ceramic paper 13 can be made of alumina or the like, for example. The thickness of the ceramic paper 13 can be set to about 0.5 to 5 mm, for example. If the ceramic paper 13 is too thin, the strength of the ceramic paper 13 may be too low. On the other hand, if the ceramic paper 13 is too thick, the flexibility of the ceramic paper 13 may be too low.

  Next, the crystalline glass curved plate 20 that is the base material of the crystallized glass curved plate 1 is placed on the ceramic paper 13. The crystalline glass curved plate 20 preferably has substantially the same shape as the crystallized glass curved plate 1. That is, the crystalline glass curved plate 20 includes a first flat plate portion 21, a second flat plate portion 22, and a bent portion 23 that connects the first flat plate portion 21 and the second flat plate portion 22. It is preferable to have. In the crystalline glass curved plate 20, the first flat plate portion 21 is in contact with the first portion 13a, the second flat plate portion 22 is in contact with the second portion 13b, and the bent portion 23 is in contact with the bent portion 13c. Is placed on the ceramic paper 13.

  Next, the crystallized glass curved plate 1 is produced by heating and crystallizing the crystalline glass curved plate 20 placed on the ceramic paper 13. The temperature and time of the heat treatment can be appropriately set according to the main crystal of the crystallized glass curved plate 1 and the like. The heat treatment temperature can be, for example, about 700 ° C. to 900 ° C. The heat treatment time (the time for holding at the maximum temperature) can be about 2 to 6 hours.

  By the way, the crystalline glass curved plate 20 is deformed in the crystallization process. This deformation reduces the radius of curvature of the bent portion 23 of the crystalline glass curved plate 20. Therefore, as shown in FIG. 3, the entire ceramic paper 113 is supported by the support members (first and second support members 111 and 112), the bent portion 123 of the crystalline glass curved plate 120, the ceramic paper 113, , The bent portion 123 of the crystalline glass curved plate 120 is deformed, the bent portion 123 comes into contact with the support member via the ceramic paper 113, and its own weight is the crystalline glass curved plate. The contact portion between the bent portion 123 and the support member is added via the ceramic paper 113. As a result, a large contact pressure is applied to the bent portion 123 of the crystalline glass curved plate 120. Therefore, the surface shape of the ceramic paper 113 is easily transferred to the bent portion 123 of the crystalline glass curved plate 120. As a result, the surface property of the bent portion of the obtained crystallized glass curved plate may be deteriorated.

  In view of this, for example, as shown in FIG. 4, it is also conceivable to previously provide a support base 130 below the bent portion 123 that is separated from the ceramic paper 113. However, even in this case, since the weight of the crystalline glass curved plate 120 cannot be supported by the entire crystalline glass curved plate 120, the weight of the crystalline glass curved plate 120 is concentrated on a part, and the surface of the obtained crystallized glass curved plate is obtained. Properties may deteriorate.

  In contrast, in the present embodiment, the bent portion 13c of the ceramic paper 13 is separated from the support members 11 and 12. Since the ceramic paper 13 supports the bent portion 23 of the crystalline glass curved plate 20, the crystalline glass curved plate 20 is excessively deformed in the crystallization process, and the curvature radius of the bent portion 23 of the glass curved plate 20 becomes too small. Can be suppressed. Further, since the bent portion 13c of the ceramic paper 13 is separated from the support members 11 and 12, even if the weight of the glass curved plate 20 is added to the ceramic paper 13, the bent portion 23 of the glass bent plate 20 and the ceramic paper 13 are added. Is smaller than the contact pressure when the glass curved plate 20 is in contact with both the ceramic paper 13 and the support members 11 and 12, and the surface shape of the ceramic paper 13 is not easily transferred to the bent portion 23. As a result, the surface property of the bent portion of the obtained crystallized glass curved plate is improved.

  In the technique of the present embodiment that can produce the crystallized glass curved plate 1 having excellent surface properties, the curvature radius of the bent portion 23 is 5 mm or more, further 20 mm or more, and the bent portion 23 is easily separated from the ceramic paper 13. It is especially effective in cases. That is, the technique of the present embodiment capable of manufacturing the crystallized glass curved plate 1 having excellent surface properties is used for manufacturing the crystallized glass curved plate 1 in which the curvature radius of the bent portion 1c is 5 mm or more, and further 20 mm or more. It is particularly effective.

  In the present embodiment in which the bent portion 13c is not supported, it is preferable that the strength of the ceramic paper 13 is high. Therefore, the thickness of the ceramic paper 13 is preferably 0.5 mm or more, and more preferably 1.0 mm or more. However, if the ceramic paper 13 is too thick, it is necessary to bend the ceramic paper 13 when producing the ceramic paper 13 having the shape of the bent portion 13 c, so that wrinkles are likely to occur on the inner surface of the ceramic paper 13. The wrinkles are transferred when the crystalline glass curved plate is softened, and the appearance of the crystallized glass curved plate may be impaired. Therefore, the thickness of the ceramic paper 13 is preferably 5.0 mm or less, and more preferably 2.0 mm or less.

(Modification)
In the above embodiment, the example in which the first support member 11 and the second support member 12 are provided integrally has been described. However, the present invention is not limited to this configuration. For example, as FIG. 5 shows, the 1st supporting member 11 and the 2nd supporting member 12 do not need to be provided integrally. In the example shown in FIG. 5, the first and second support members 11 and 12 are not provided below the bent portion 13c.

  Further, as shown in FIG. 6, the support members 11 and 12 do not have a support surface, and the entire portion of the ceramic paper 13 located under the crystalline glass curved plate 20 is not supported. Also good. For example, it is effective when manufacturing a crystallized glass curved plate that is entirely bent.

DESCRIPTION OF SYMBOLS 1 ... Crystallized glass curved plate 1a ... 1st flat plate part 1b ... 2nd flat plate part 1c ... Bending part 10 ... Forming apparatus 11 ... 1st support member 11a ... 1st support surface 12 ... 2nd support member 12a ... 2nd support surface 13 ... Ceramic paper 13a ... 1st part 13b ... 2nd part 13c ... Bending part 14a, 14b ... Fixture 20 ... Crystalline glass curved plate 21 ... 1st flat plate part 22 ... 1st 2 flat plate portions 23 ... bent portion

Claims (5)

  A crystalline glass curved plate is formed on a flexible ceramic paper supported by a first support member and a second support member and having a bent portion spaced apart from the first and second support members. The manufacturing method of the crystallized glass curved plate which produces the crystallized glass curved plate by heating and crystallizing the crystalline glass curved plate in the mounted state.   The said crystalline glass curved plate is mounted on the said flexible ceramic paper so that the bending part of the said crystalline glass curved plate may contact the bending part of the said flexible ceramic paper. Of manufacturing a crystallized glass curved plate. The first support member has a first support surface that extends obliquely downward toward the second support member side and supports the flexible ceramic paper,
The second support member has a second support surface that extends obliquely downward toward the first support member side and supports the flexible ceramic paper,
A first portion supported by the first support surface; a second portion supported by the second support surface; a bent portion connecting the first portion and the second portion; The manufacturing method of the crystallized glass curved plate of Claim 1 or 2 which mounts the said crystalline glass curved plate on the said flexible ceramic paper which has.   The manufacturing method of the crystallized glass curved plate as described in any one of Claims 1-3 with which the said 1st supporting member and the said 2nd supporting member are provided integrally.   The manufacturing method of the crystallized glass curved plate as described in any one of Claims 1-4 whose curvature radius of the bending part of the said crystallized glass curved plate is 5 mm or more.

Images