JP2011037687A - Mold for molding glass material and method for molding glass material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the operation efficiency by suppressing the operation man hour by reducing the weight of a load plate loaded on a pressing fixture in the mold to a weight that can be handled by human power. <P>SOLUTION: When a glass material used for molding a cylindrical glassware is heated and melted, the glass material is processed to a pillar shape having a recessed central part, that is, a shape close to a cylindrical shape by pressing the central part of the glass material. Since the volume of the central part of the glass material which has been heated and melted significantly decreases, it is possible to significantly decrease the weight of the central part to be ground in a grinding step, thus capable of saving material. The load plate having a required weight for use in the pressing is divided into a plurality of load plates each having a weight of 5 kg or more and 10 kg or less per sheet, so that the load plate can be handled by human power, thereby reducing the operation man hour for assembling the mold. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mold material for molding a glass material and a method for molding a glass material using the same, and in particular, various glass materials such as quartz glass, silicate glass, or soda glass are molded into a desired shape while being heated and melted. The present invention relates to a mold material used at the time and a molding method using the mold material.

In recent years, glass products, particularly glass products made of quartz glass (hereinafter referred to as quartz glass products) are not limited to optical devices such as optical lenses, but are used for semiconductor manufacturing by taking advantage of their durability and chemical stability. Widely used in jigs, liquid crystal displays (LCDs), photomasks for panel manufacturing, precision parts for optical communication, and the like.
In general, as a manufacturing process of such a quartz glass product, a process mainly using a removal process for removing an unnecessary region from an object to be processed, such as etching or grinding, has been adopted.

However, since the manufacturing process by etching is limited to relatively fine processing of the surface of the object to be processed, there is a problem that the glass product obtained thereby is limited.
In addition, since the manufacturing process by grinding is performed to grind the processing object little by little to process it into a desired shape, it takes a lot of processing time and all unnecessary parts are ground from the processing object. Compared to the weight of glass products processed into a larger size, a larger weight of glass material is required, and problems have been pointed out in terms of manufacturing efficiency and manufacturing cost.

  For example, when trying to obtain a cylindrical quartz glass product, in a heating apparatus such as an electric furnace, a processing object that is a quartz glass material placed in the mold is heated and melted by a cylindrical mold. Then, an intermediate body that is a rough shape of the quartz glass product is manufactured by grinding the central portion of the molded body formed into a cylindrical shape, and the cylindrical quartz glass product is finished by further machining the intermediate body. Has been made.

  Thus, in order to produce an intermediate body by grinding the central part of the molded body that has been heated and melted and formed into a cylindrical shape, when producing a cylindrical quartz glass product with a large inner diameter, when producing the intermediate body Since many parts of the molded body formed into a cylindrical shape are ground, the weight of the quartz glass material relative to the weight of the quartz glass product finished by further grinding the intermediate body may be required 10 times or more. This has led to an increase in manufacturing costs.

Here, a method of manufacturing a cylindrical quartz glass product by grinding will be described with reference to FIGS.
FIG. 1 (a) is a schematic perspective view illustrating the structure of a mold material used in a conventional glass material molding method, and FIG. 1 (b) is a view taken in the direction of arrow A in FIG. 1 (a). FIG. 1 (c) shows a cross-sectional view taken along line BB of FIG. 1 (a). FIG. 2 (a) shows a mold material and a workpiece after heating and melting. FIG. 2B is a perspective explanatory view of the object to be processed shown in FIG. 2A.

A mold member 100 used for the glass material molding method according to the prior art includes a bottom plate 12 and a cylindrical outer tube 14 which is disposed on the upper surface 12a of the bottom plate 12 and has a desired inner diameter.
The upper surface 12a of the bottom plate 12 and the inner peripheral surface 14a of the outer cylinder 14 are each coated with a release material.

  In the above configuration, in order to produce a cylindrical quartz glass product, first, the workpiece 16 that is a quartz glass material is arranged on the upper surface 12a of the bottom plate 12 in the outer cylinder 14, and the workpiece 16 is arranged. The mold material 100 is heated by a heater (not shown) under predetermined conditions.

  Thus, when the mold member 100 is heated under predetermined conditions, the workpiece 16 is heated and melted, and the workpiece 16 heated and melted has an inner diameter of the outer cylinder 14 as shown in FIG. It is produced as a cylindrical shaped body having the same outer diameter.

  Then, by grinding the central portion of the molded body that is the workpiece 16 that has been heated and melted into a cylindrical shape, an intermediate body that is a rough shape of the desired cylindrical quartz glass product is produced, and this intermediate body is further ground, etc. The cylindrical quartz glass product finished to the final specified dimensions through the machining process is manufactured.

  As described above, in the prior art, in producing a cylindrical quartz glass product, the central portion of the molded body, which is the workpiece 16 heated and melted into a columnar shape, is ground to obtain a rough shape of the quartz glass product. Since it is necessary to obtain an intermediate body, depending on the cylindrical shape to be molded, a large portion of the molded body that is the workpiece 16 that is heated and melted into a columnar shape is ground, and the quartz glass material for the manufactured quartz glass product May require 10 times or more in weight ratio, leading to an increase in manufacturing cost.

Therefore, conventionally, cylindrical glass products have been molded, but by molding cylindrical glass products, the weight of the quartz glass material can be reduced, so when heating and melting the glass material to be used, Molding has been performed using a mold material in a cylindrical shape in which the central portion is pressed and the central portion is recessed. The mold material has a bottom plate, a cylindrical portion disposed on the bottom plate in contact with the bottom plate and one open portion, an outer diameter substantially the same as an inner diameter of the cylindrical portion, and an inner peripheral surface of the cylindrical portion A guide member that is slidably movable in the up-and-down direction; a pressing jig that is disposed on the lower surface of the guide member and that presses the upper surface of the glass material disposed on the bottom plate in the cylindrical portion; And a load plate for applying a load to the pressing jig.
As a result, a cylindrical glass product could be formed and the weight of the quartz glass material to be used could be reduced. However, the load plate has a weight of 10 kg or more. It was impossible, and it was necessary to use a hoist installed on the ceiling of the work area, and the work required two or more personnel. Since the load plate is heavy, a carriage has been used for conveyance. This is a work procedure of loading the load plate onto the carriage, transporting the carriage with the carriage, and loading the carriage from the carriage onto the guide member by using a hoist.

Japanese Patent No. 3778250

  The present invention has been made in view of the various problems of the prior art as described above, and its object is to weight the glass material used when forming a cylindrical glass product. Therefore, the present invention provides a mold material and a glass product molding method using the mold material in which the manufacturing cost is reduced. In particular, the load plate loaded on the pressing jig in the mold material can be handled manually to improve work efficiency.

In order to achieve the above object, the present invention is a columnar shape in which a central portion is depressed by pressing its central portion when a glass material used for forming a glass product having a cylindrical shape is heated and melted, that is, It is processed into a shape close to a cylindrical shape, the volume of the central portion of the glass material heated and melted is significantly reduced, and the weight of the central portion ground in the grinding process is significantly reduced.
Further, the load plate having a weight that is difficult to handle by human power is used, and the weight per load plate is divided into weights that can be handled by human power. By setting the weight to 5 kg or more and 10 kg or less, the work man-hours required for assembling the mold material can be reduced, the weight of the glass material can be remarkably reduced compared to the conventional method, the work man-hours can be suppressed, and the manufacturing cost can be reduced It was done.

According to the first aspect of the present invention, in a mold material for heating and melting a glass material to form a general shape of a cylindrical glass product, the bottom plate is disposed on the bottom plate in contact with the bottom plate and one open portion. Arranged on the lower surface of the guide member, and a guide member having an outer diameter substantially the same as the inner diameter of the cylinder portion and slidable in the vertical direction on the inner peripheral surface of the cylinder portion. And a pressing jig for pressing the upper surface of the glass material placed on the bottom plate in the cylindrical portion, and a load plate for applying a load to the pressing jig, and the shape of the load plate Is a cylindrical shape, and further, the load plate is divided into weights that can be handled easily by human power, and one or more sheets are used as a pressing load.
The invention described in claim 2 is the invention described in claim 1, wherein the heating temperature at the time of melting by heating is 1500 to 2000 ° C.
According to a third aspect of the present invention, the weight of the divided load plate is 5 kg or more and 10 kg or less.
In the invention according to claim 4, the glass material is heated and melted in an inert gas atmosphere of nitrogen, argon, neon, or helium or in a vacuum.
According to a fifth aspect of the present invention, there is provided a mold material for forming a general shape of a cylindrical glass product by heating and melting a glass material, and disposed on the bottom plate in contact with the bottom plate, the bottom plate and one opening. A cylindrical member, a guide member having an outer shape substantially the same as the inner diameter of the cylindrical portion, and slidably movable in the vertical direction on the inner peripheral surface of the cylindrical portion; and a lower surface of the guide member. And a pressing jig for pressing the upper surface of the glass material placed on the bottom plate in the cylindrical portion, and a plurality of load plates for applying a load to the pressing jig, the shape of the load plate Is a columnar shape, and is a mold material for molding a glass material having a weight per sheet of 5 kg or more and 10 kg or less.

  Since the present invention is configured as described above, it is possible to reduce the weight of the glass material used in manufacturing a cylindrical glass product, and to manufacture by reducing the work man-hours. The cost can be reduced, and further, an excellent effect of improving the production yield of the glass product is achieved.

The schematic structure perspective view of the type | mold material used for the shaping | molding method of the glass material by a prior art. Sectional drawing of the process target object and mold material after heat-melting, and the perspective view of the process target heat-melted. The schematic structure perspective view and sectional drawing of the type | mold material used for the shaping | molding method of the glass material by 1st Embodiment.

10, 100 Mold material 12 Bottom plate 14 Outer cylinder 16 Workpiece 18 Pressing jig 20 Guide member 22 Load plate

  Hereinafter, an example of a mold material and a glass material molding method using the mold material according to the present invention will be described in detail with reference to the accompanying drawings.

  In the following description, the same or equivalent configuration as that of the mold 100 used in the glass material molding method according to the related art described with reference to FIGS. 1 and 2 is the same as the reference numerals used above. Detailed description of the configuration and operation will be omitted as appropriate by using reference numerals.

FIG. 3 (a) shows a schematic configuration perspective view of the mold material used in the first embodiment of the glass material molding method according to the present invention, and FIG. 3 (b) shows FIG. FIG. 3C is a perspective view of the load plate 22 of FIG. 3A.
The mold material 10 used in this glass material molding method includes a bottom plate 12, a cylindrical outer cylinder 14 which is disposed on the upper surface 12a of the bottom plate 12 and has a desired inner diameter, and an outer diameter substantially the same as the inner diameter of the outer cylinder 14. A guide member 20 that has a disk shape having a diameter and is slidably movable in the vertical direction on the inner peripheral surface 14a of the outer cylinder 14, and a load that is disposed on the upper surface 20a of the guide member 20 to apply a load. The workpiece 22 which is a quartz glass material disposed on the upper surface 12a of the bottom plate 12 with the center positioned on the central axis O of the outer cylinder 14 and disposed on the lower surface 20b of the plate 22 and the guide member 20 is pressed from above. And a substantially cylindrical pressing jig 18.

  Here, the load plate 22, the guide member 20, and the pressing jig 18 are configured to be able to move freely along the central axis O of the outer cylinder 14 by applying a load manually or the like. When the load due to is removed, the weight of the load plate 22, the guide member 20, and the pressing jig 18 are configured to move downward along the central axis O of the outer cylinder 14 due to the weight of each weight.

Note that the load plate 22, the guide member 20, and the pressing jig 18 are configured such that their center of gravity is positioned on the central axis O.
Further, the surface pressure at which the lower surface 18b of the pressing jig 18 presses the workpiece 16 that is a quartz glass material is set by the total weight of the pressing jig 18, the guide member 20, and the load plate 22. The surface pressure can be adjusted to a desired level by changing the weight of 22. For example, if a plurality of load plates 22 having a constant weight can be arranged on the upper surface 20a of the guide member 20, the load can be adjusted to an arbitrary load by adjusting the number of load plates 22 arranged on the upper surface 20a of the guide member 20. In addition, a desired surface pressure can be obtained.

  Furthermore, each member used for the above-described mold member 10 is not particularly limited as long as it has high hot strength and chemical stability and is of high purity, but since it is easy to machine, It is preferably made of carbon because it is easy to produce.

  In the above configuration, for example, in order to manufacture a cylindrical quartz glass product, the workpiece 16 that is a quartz glass material is disposed on the upper surface 12a of the bottom plate 12 so that the center is located on the central axis O of the outer cylinder 14. Then, the mold 10 in which the load plate 22, the guide member 20, and the pressing jig 18 are moved downward along the center axis O of the outer cylinder 14 by the weights of the weights of the load plate 22, the guide member 20, and the pressing jig 18. In an atmosphere of an inert gas such as neon gas or helium gas, or in a vacuum, it is placed in a heating device such as an electric furnace that is heated to a predetermined temperature.

  When the workpiece 16 begins to be heated and melted in the heating device, the pressing jig 18 is placed on the upper surface 16a of the workpiece 16 due to the weight of the load plate 22, the guide member 20, and the pressing jig 18 due to their own weights. The central portion is pressed to forcibly deform the central portion of the upper surface 16 a of the workpiece 16, and a concave portion along the outer shape of the pressing jig 18 is formed in the central portion of the upper surface 16 a of the workpiece 16. It is formed.

That is, the molded object that is the heat-melted workpiece 16 is molded into a cylindrical shape with the center portion of the upper surface 16 a being recessed by the mold 10.
At this time, the size of the concave portion formed in the central portion of the upper surface 16a of the molded body that is the heat-melted workpiece 16 can be adjusted by the diameter and thickness of the pressing jig 18.

In this way, the molded object that is the object 16 to be processed after heating and melting formed into a substantially cylindrical shape is ground and cut to a specified dimension in the next process, and processed as an intermediate body that is a rough shape of a cylindrical or ring-shaped quartz glass product. Then, the processed intermediate body is manufactured as a quartz glass product having a final shape and dimensions through a machining process such as further grinding.
Thus, when producing the intermediate body which is a molded object of the quartz glass product of the previous stage manufactured as a quartz glass product using the mold material 10, the molded object which is the workpiece 16 heated and melted in the next process. The volume of the central portion can be reduced by forming the central portion to be ground and cut so that the intermediate portion, which is a quartz glass product, is ground and cut. The weight of the central portion to be cut can be reduced.

Further, according to the mold member 10, the size of the concave portion formed in the central portion of the molded body that is the workpiece 16 after heating and melting can be adjusted by the diameter of the pressing jig 18 and the thickness in the direction of the central axis O. It is also possible to adjust the amount of the central portion that is ground and cut in the grinding and cutting process when producing the intermediate.
That is, in order to reduce the weight of the glass material with respect to the glass product to be manufactured, the diameter of the pressing jig 18 is set to a size that approximates the inner diameter of the intermediate body of the glass product to be manufactured, and the center of the pressing jig 18 The thickness in the direction of the axis O may be a size that approximates the height of the intermediate body of the glass product to be manufactured.

  Furthermore, one or more load plates 22 are provided on the guide member 20 in order to apply a load for applying an appropriate surface pressure to the pressing jig 18 when the desired molded body 16 is formed from the glass member 20. However, when the weight of the load plate 22 is not less than 5 kg and not more than 10 kg per sheet, the number of work steps can be reduced. Conventionally, for example, when a load of 30 kg is required, a load plate 22 having a corresponding weight is stacked on one guide member and a mold material is assembled. However, the load plate 22 is taken out from a storage place, conveyed, and guided. In order to load it up, a corresponding man-hour is required, but by reducing the weight of the load plate to a weight of 5 kg to 10 kg, it is possible to reduce the man-hours. Until now, since the load plate 22 is heavy, it is lifted with a hoist at the storage location, placed on the carriage, transported to the vicinity of the electric furnace, lifted from the carriage again with the hoist, and placed on the guide member. The loading work of the load plate 22 was performed by the method. On the other hand, in the present invention, by setting the weight per load plate to 5 kg or more and 10 kg or less, it can be easily carried by hand and can be manually loaded on the guide member as well. The number of work steps can be reduced to about 1/3 compared with the conventional method.

However, if the weight of the load plate 22 is reduced to less than 5 kg, the number of load plates 22 to be loaded increases and the amount of work increases, resulting in poor efficiency. For example, when a load of 30 kg is required, six or more load plates, each of which is less than 5 kg, are required. In the case of a load plate having 10 kg per sheet, three sheets are sufficient.
In addition, it is preferable that the heating temperature of the workpiece 16 during heating and melting described above is, for example, 1500 to 2000 ° C., and more specifically, 1750 to 1900 ° C.

  This is because when the heating temperature of the workpiece 16 is less than 1500 ° C., the quartz glass has high viscosity, so that the quartz glass material is not easily deformed, and the mold material 10 may not be molded into the desired shape. In addition, when the heating temperature of the workpiece 16 exceeds 2000 ° C., the quartz glass material may decompose and react with carbon that is a material of each component of the mold 10.

Next, the results of an experiment conducted by the inventor of the present invention using the above-described mold member 10 and the load plate 22 processed so that the weight of one sheet is 5 kg or more and 10 kg or less will be described below.
The outer cylinder 14 has an inner diameter of 550 mm, and an electric furnace is used as a heating device to heat and melt the cylindrical workpiece 16 at a heating temperature of 1800 ° C. in a nitrogen gas atmosphere at a pressure of 0.03 MPa. The dimensions of the molded body that is the workpiece 16 after heating and melting are shown. Actually, the molded body after heating and melting is ground and cut into an intermediate body. This dimension is a ring material having an outer diameter of 520 mm, an inner diameter of 378 mm, and a thickness of 94 mm.

Table 1 shows the experimental results. Here, in Examples 1 to 10 in Table 1, heating and melting in the case of using a mold 10 according to the present invention using an outer cylinder 14 having an inner diameter of 550 mm and a large number of load plates processed with a weight of 10 kg. The dimensions and weight of the previous workpiece 16, the dimensions of the compact after heating and melting, and the weight and number of load plates loaded before molding are shown.
Furthermore, the working efficiency when loading the load plate is shown. Here, the work man-hour is expressed as a ratio of the time actually taken, assuming that the time taken to load one conventionally used load plate is 1.0.

  Further, in Comparative Examples 1 to 5 in Table 2, the dimensions and weight of the workpiece 16 before heating and melting in the case where a large number of the mold material 10 and the conventional load plate (the weight of one sheet is 20 kg or more) are used, The size of the compact after heating and melting, and the weight and number of load plates loaded at the time of molding are shown. Furthermore, the work man-hour when loading the load plate is shown.

表２の比較例１〜５に示すように、従来技術による荷重板２２と型材１０を用いた場合には、荷重板重量は、８５〜１４０ｋｇであり、５〜７枚の荷重板を積載するが、作業工数は、４．３〜７．０であり、作業にかなりの負担がかかっていることがわかる。これに対して、本発明による荷重板２２を用いた場合には、表１の実施例１〜１０に示すように、荷重板総重量は６４〜１１０ｋｇであり、７〜１１枚の荷重板を積載するが、作業工数は、１．１〜１．８であり、比較例の作業工数に比べ、およそ１／３程度であることがわかる。

As shown in Comparative Examples 1 to 5 in Table 2, when the load plate 22 and the mold material 10 according to the prior art are used, the load plate weight is 85 to 140 kg, and 5 to 7 load plates are loaded. However, the work man-hour is 4.3 to 7.0, and it can be seen that a considerable burden is imposed on the work. On the other hand, when the load plate 22 according to the present invention is used, as shown in Examples 1 to 10 of Table 1, the total weight of the load plate is 64 to 110 kg, and 7 to 11 load plates are used. Although it loads, the work man-hour is 1.1-1.8, and it turns out that it is about 1/3 compared with the work man-hour of a comparative example.

  As described above, since the conventional load plate 22 is a heavy article, the operation of lifting it from a storage location, placing it on a cart, moving it, lifting it again and loading it on the guide member is repeated several times. Therefore, although corresponding work time is required, according to the present invention, since the load plate 22 can be reduced in weight, it can be transported manually, so that the number of work steps can be remarkably reduced, which is about 1/3 of the conventional one. The amount of work can be made.

Claims (5)

In a mold that heats and melts a glass material to form a schematic shape of a cylindrical glass product, a bottom plate, a cylindrical portion disposed on the bottom plate in contact with the bottom plate and one opening, and the cylindrical portion A guide member having substantially the same outer shape as the inner diameter of the cylindrical portion and slidably movable in the vertical direction on the inner peripheral surface of the cylindrical portion, and disposed on the lower surface of the guide member, and in the cylindrical portion, A pressing jig for pressing the upper surface of the glass material placed on the bottom plate; a load plate for applying a load to the pressing jig; and the shape of the load plate is a cylindrical shape, and the load A method of forming a glass material using a mold material, wherein a plurality of plates are divided into weights that can be handled manually, and one or more of the divided load plates are used in an overlapping manner. The glass material molding method using the mold material according to claim 1, wherein a heating temperature at the time of melting by heating is 1500 to 2000 ° C. 3. A glass material molding method using the mold material according to claim 1, wherein the weight of the divided load plate is 5 kg or more and 10 kg or less. 4. A glass material using a mold material according to claim 2, wherein the heating and melting are performed in nitrogen, argon, neon, helium or vacuum. Molding method. In a mold material for forming a rough shape of a cylindrical glass product by heating and melting a glass material, a bottom plate, a cylindrical portion disposed on the bottom plate in contact with the bottom plate and one opening, and the cylindrical portion A guide member having substantially the same outer shape as the inner diameter of the cylindrical portion and slidably movable in the vertical direction on the inner peripheral surface of the cylindrical portion, and disposed on the lower surface of the guide member, and in the cylindrical portion, A pressing jig for pressing the upper surface of the glass material placed on the bottom plate, and a plurality of load plates for applying a load to the pressing jig, wherein the shape of the load plate is cylindrical, and A mold material for molding a glass material, wherein the weight per load plate is 5 kg or more and 10 kg or less.

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