Method for processing glass

Abstract

To provide a method for processing glass that processes a glass product having a surface with an uneven pattern at low cost.SOLUTION: A method for processing glass includes: a placing step of placing a flat plate-like template glass 1 having a surface at which an uneven pattern is formed on a mold 3 in which a recess corresponding to a final processing shape is formed; and a heating step of heating the mold 3 on which the template glass 1 is placed inside a furnace to soften the template glass 1 and curve the template glass 1 so as to be shaped along the recess with the self-weight.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a glass processing method for processing glass products such as plates and lampshades having a textured surface. [Background technology]

[0002] As a method for manufacturing a glass product having an uneven pattern on its surface, for example, as shown in Patent Document 1 below, a method has been proposed in which a glass ribbon 22 is passed between a pair of rotating rollers 30, 32 having an uneven pattern 36 formed on one side thereof to impart a pattern to one side of the glass ribbon 22, and the glass ribbon 22 is then vacuumed in a vacuum mold cavity 14 provided on a turret 10 to process it into a plate or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-85756 Summary of the Invention [Problem to be solved by the invention]

[0004] In the method disclosed in Patent Document 1, in order to change the embossed pattern on a glass product, the roller itself on one side on which the embossed pattern is formed must be replaced, which is problematic in that it is costly.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a glass processing method for inexpensively processing a glass product having an uneven surface pattern. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides: a step of placing the flat molded glass having a concave-convex pattern formed on its surface on a mold having a concave portion corresponding to the shape of the final product; a heating step of heating the mold on which the patterned glass is placed in a furnace to soften the patterned glass and to cause the patterned glass to bend under its own weight so as to conform to the shape of the recess; The present invention provides a method for processing glass comprising the steps of:

[0007] Patterned glass is manufactured to have a wide variety of decorative uneven patterns, and by using this patterned glass as a material for glass products, glass products having the uneven patterns on their surfaces can be manufactured at low cost.

[0008] In the above configuration, The heating step comprises: a first heating step of heating the inside of the furnace to a first temperature; a second temperature increasing step of increasing the temperature inside the furnace from the first temperature to a second temperature; a holding step of holding the inside of the furnace at the second temperature for a predetermined time; a cooling step of cooling the inside of the furnace from the second temperature; It is preferable to have a configuration having the above structure.

[0009] In this way, the temperature inside the furnace can be made uniform by the first heating step in which the temperature is raised to a first temperature, and by maintaining the temperature at the second temperature for a predetermined period of time, the patterned glass can be bent uniformly and smoothly to conform to the shape of the recess in the mold.

[0010] In the holding step, The second temperature is preferably within a range of 600° C. to 770° C., and the predetermined time is preferably within a range of 30 seconds to 15 minutes. When the second temperature and the predetermined time are within these ranges, a good surface condition of the processed glass product can be obtained. Effect of the Invention

[0011] In this invention, a flat molded glass sheet having a decorative uneven pattern formed on its surface is placed on a mold having recesses corresponding to the final product shape, and then heated to bend under its own weight, making it possible to inexpensively process glass products having the uneven pattern on their surface. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram of a glass processing method according to the present invention, in which (a) is a perspective view of a patterned glass plate cut into a predetermined shape, viewed from below; (b) is a cross-sectional view of the patterned glass plate placed on a mold; (c) is a cross-sectional view of the patterned glass plate warped by heating; and (d) is a perspective view of a processed glass product (a plate in this embodiment) viewed from below. [Diagram 2] A diagram showing the temperature change in the furnace during the heating process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] One embodiment of the glass processing method according to the present invention will be described with reference to the drawings. This glass processing method is a method for processing a glass product 2, such as a plate or a lampshade, having a decorative uneven pattern on the surface, using a flat molded glass 1, and mainly comprises a placing step and a heating step.

[0014] The placing step is a step of placing a flat-shaped patterned glass 1 having a decorative uneven pattern formed on its surface as shown in Fig. 1(a) on a mold 3 having recesses formed therein corresponding to the shape of the final product (such as a plate or a lampshade) as shown in Fig. 1(b). This patterned glass 1 is pre-cut into a predetermined shape corresponding to the shape of the final product (for example, a circle, an oval, a polygon, etc. if the final product is a plate).

[0015] This patterned glass 1 has a concave-convex pattern formed on one side, and the other side is flat. In this embodiment, the patterned glass 1 is placed on the mold 3 so that one side (the side with the concave-convex pattern) faces downward. In this embodiment, a 2 mm thick patterned glass 1, which is widely distributed in Japan, is used, but a patterned glass 1 of a different thickness, such as 4 mm or 6 mm, which is relatively widely distributed overseas, can also be used. In addition, it is possible to place the patterned glass 1 on the mold 3 so that the other side (flat side) faces downward. In addition, the material of the mold 3 is not particularly limited, and metal, refractory material, etc. can be used.

[0016] The heating step is a step in which the mold 3 on which the patterned glass 1 is placed is heated in a furnace to soften the patterned glass 1, and the patterned glass 1 is bent by its own weight to conform to the shape of the recess, as shown in Fig. 1(c). More specifically, as shown in Fig. 2, the heating step mainly comprises a first heating step of heating the inside of the furnace to a first temperature T1, a second heating step of heating the inside of the furnace from the first temperature T1 to a second temperature T2, a holding step of holding the inside of the furnace at the second temperature T2 for a predetermined time t2, and a cooling step of cooling the inside of the furnace from the second temperature T2.

[0017] In this embodiment, as shown in Fig. 1 (b) (c), the above series of heat treatments were performed using an electric furnace 4 (single-phase AC 200V or three-phase AC 200V). In this embodiment, the first temperature T1 was set to 550-600°C, the second temperature T2 was set to 740-750°C, and the predetermined time t2 for holding at the second temperature was set to 1-10 minutes. In addition, the heating rate R1 in the first heating step was set to 265°C / hour, and the heating rate R2 in the second heating step was set to the maximum heating rate of the electric furnace 4 in this temperature range (which varies depending on the furnace, but for example, about 100-300°C / hour).

[0018] In this embodiment, as shown in FIG. 2, after the first heating step is completed, the temperature in the furnace is stabilized by holding the temperature for a predetermined time t1 (here, 30 minutes), and then the second heating step is performed. The first temperature T1 can be appropriately changed within a range of, for example, 400°C to 600°C, and the predetermined time t1 can be appropriately changed within a range of, for example, 5 minutes to 1 hour. In addition, if the stability of the temperature in the furnace is sufficiently ensured, it may be possible to omit holding the predetermined time t1 (t1=0 minutes). In addition, the cooling step is natural cooling from the second temperature T2 (the heater power is turned off with the door of the electric furnace 4 closed). After this cooling step, finishing processing such as periphery processing of the glass product 2 is performed as necessary.

[0019] The second temperature T2 is set within the range of 600°C to 770°C. When the used patterned glass 1 is stained glass, it can be set preferably within the range of 600°C to 700°C. On the other hand, when the used patterned glass 1 is float glass used for construction, it can be set preferably within the range of 730°C to 760°C, more preferably within the range of 735°C to 755°C. If the second temperature T2 is too low, the finished glass product 2 may have a frosted edge, or the glass product may not be easily bent under its own weight. If the second temperature T2 is too high, the edges of the uneven pattern on the surface of the finished glass product 2 may become droopy, impairing the appearance. Therefore, it is preferable to set the second temperature within the above range according to the type of the used patterned glass 1.

[0020] The predetermined time t2 for holding at the second temperature T2 can be set within the range of 30 seconds to 15 minutes, preferably 45 seconds to 13 minutes, and more preferably 1 minute to 10 minutes. If the predetermined time t2 is shorter than 30 seconds, the bending due to its own weight will be insufficient, whereas if the predetermined time t2 is longer than 15 minutes, the edges of the uneven pattern on the surface of the finished glass product 2 may become droopy, impairing the aesthetic appearance, and therefore it is preferable to set the time within the above range.

[0021] The above-mentioned glass processing method involves placing a flat molded glass 1 having a decorative uneven pattern formed on its surface on a mold 3 having recesses corresponding to the final product shape, and then heating it so that it is warped by its own weight, thereby making it possible to inexpensively process a glass product 2 having the uneven pattern on its surface.

[0022] Furthermore, since the above-mentioned glass processing method comprises a heating process that is composed of the above-mentioned multiple steps, the temperature inside the furnace can be made uniform by the first heating process of raising the temperature to the first temperature T1, and by maintaining the temperature at the second temperature T2 for a predetermined time t2, the patterned glass 1 can be bent uniformly and smoothly to fit the shape of the recess in the mold 3.

[0023] Furthermore, in the above-mentioned glass processing method, the second temperature T2 is set in the range of 600°C or higher and 770°C or lower, and the predetermined time t2 for maintaining the second temperature T2 is set in the range of 30 seconds or higher and 15 minutes or lower, so that a good surface condition of the processed glass product 2 can be obtained.

[0024] The embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. Therefore, the scope of the present invention is defined by the claims, not by the above description, and is intended to include the meaning equivalent to the claims and all modifications. [Explanation of symbols]

[0025] 1. Patterned Glass 2. Glass products 3. Mold 4. Electric furnace

Claims

1. a step of placing a flat molded glass (1) having a concave-convex pattern formed on its surface on a mold (3) having a concave portion corresponding to the shape of the final product; a heating step of heating the mold (3) on which the patterned glass (1) is placed in a furnace to soften the patterned glass (1) and to cause the patterned glass (1) to bend under its own weight so as to conform to the shape of the recess; The glass processing method according to the present invention comprises the steps of:

2. The heating step comprises: The furnace is heated to a first temperature (T １ A first heating step of heating the mixture to a temperature of 100° C.; The furnace is heated to the first temperature (T １ ) to a second temperature (T ２ A second heating step of heating the mixture to a temperature of 100° C. The furnace is heated to the second temperature (T ２ ) at a given time (t ２ ) a holding step; The furnace is heated to the second temperature (T ２ a cooling step of cooling the mixture from the The method of claim 1, further comprising the steps of:

3. The second temperature (T ２ 3. The glass processing method according to claim 2, wherein the temperature is in the range of 600° C. or more and 770° C. or less.

4. The predetermined time (t ２ 4. The method according to claim 2, wherein the time is within the range of 30 seconds to 15 minutes.

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