TW201722865A - Method for producing glass molded body and device for producing glass molded body - Google Patents

Abstract

An object of the present invention is to provide a method for producing a glass molded body and a device for producing a glass molded body, which can appropriately suppress cracking of the glass. The method for producing a glass molded body (GC) is a method of producing a glass molded body (GC) by flowing molten glass (MG) onto a molding member (12), and further comprising a preliminary heating step in the preliminary heating step in the molten glass (MG) Induction heating of the molding member (12) before contact with the molding member (12). The apparatus for manufacturing a glass molded body includes a preliminary heating unit (13) that inductively heats the molding member (12) before the molten glass (MG) comes into contact with the molding member (12).

Description

Method for producing glass molded body and device for producing glass molded body

The present invention relates to a method for producing a glass molded body and an apparatus for producing a glass molded body.

In the prior art, a method of producing a glass molded body on the mounting portion by flowing the molten glass onto the mounting portion of the conveyor is known (refer to Japanese Laid-Open Patent Publication No. 2010-006665). The conveyor disclosed in Japanese Laid-Open Patent Publication No. 2010-006665 includes a ring-shaped mounting portion that is connected by a plurality of plates. Each of the plates constituting the placing portion of the conveyor has a contact surface that is in contact with the molten glass.

Problem to be solved by the invention

According to the above-described prior art, in the method of manufacturing the glass molded body by flowing the molten glass onto the placing portion of the conveyor, when the molten glass comes into contact with the placing portion, glass cracking easily occurs due to thermal shock. As a measure for the glass cracking, the method of heating the placing portion of the conveyor by the electric heater, the burner, or the like before the contact portion of the conveyor is in contact with the molten glass is effective, but the placing portion is performed. At the time of heating, the peripheral portion of the placing portion is also easily heated to a relatively high temperature, so that the peripheral portion of the placing portion may be deteriorated or the heating efficiency of the placing portion may be lowered. Further, heating by an electric heater, a burner, or the like may have a problem that the time efficiency is poor and the speed of the production interval cannot be increased.

The present invention has been made in view of such circumstances, and an object of the invention is to provide a method for producing a glass molded body and a device for producing a glass molded body, which can appropriately suppress glass cracking.

Means for solving problems

In order to solve the above problems, an aspect of the present invention provides a method for producing a glass molded body, which comprises flowing a molten glass onto a moving body for molding to produce a glass molded body, wherein the method includes a preliminary heating step in which the preliminary heating step is performed. The molding movable body is electromagnetically heated before the molten glass is brought into contact with the molding movable body.

According to this method, since the molding movable body is heated by the preliminary heating step, thermal shock to the glass is suppressed when the molten glass comes into contact with the molding movable body. In the preliminary heating step, electromagnetic heating is used, so that the forming movable body can be heated centrally, and the peripheral portion of the forming movable body can be prevented from being heated.

In the above method for producing a glass molded body, the electromagnetic heating is preferably induction heating.

According to this method, the molding movable body can be heated to a predetermined temperature in a shorter period of time than in the case of using dielectric heating as electromagnetic heating.

In the method for producing a glass molded body, the induction heating is preferably performed by transporting the molding movable body through a conveyor and passing it through the inside of the induction coil.

According to this method, for example, the moving body for molding can be heated relatively uniformly.

In the method for producing a glass molded body, the moving body for molding is preferably a plate-shaped member having a thickness of 5 mm or more and containing 90% by mass or more of iron, and the electromagnetic heating is preferably 50 Hz or more and 400 Hz or less. High frequency induction heating.

According to this method, deformation of the molding movable body can be suppressed and the molding movable body can be appropriately heated.

In the method for producing a glass molded body, the molten glass preferably has a glass molded body which can be molded at a temperature of 30 ° C to 300 ° C and has a thermal expansion coefficient of 100 × 10 ^{- 7} /° C. or higher and contains P ₂ O ₅ . The composition of the molten glass.

The above glass molded body is particularly likely to be damaged by thermal shock. The above-described preliminary heating step is particularly effective when producing such a glass molded body.

In the method for producing a glass molded body, it is preferable to further include a rolling step in which the molten glass before the contact with the moving body for forming and the glass on the moving body for forming are rolled by a roll. At least one of them.

According to this method, a sheet-shaped glass molded body having a smaller thickness can be easily produced. In addition, in the present specification, the glass formed on the moving body for molding is described only as glass even in a molten state.

In another aspect of the present invention, in order to solve the above problems, an apparatus for producing a glass molded body is provided, wherein a glass molded body is produced by flowing a molten glass onto the moving body for molding, and the apparatus includes a preliminary heating unit, The preliminary heating unit electromagnetically heats the molding movable body before the molten glass comes into contact with the molding movable body.

Effect of the invention

According to the present invention, glass cracking can be appropriately suppressed.

Hereinafter, an embodiment of a method for producing a glass molded body and a device for manufacturing a glass molded body will be described with reference to the drawings. In addition, in the drawings, a part of the configuration may be enlarged for convenience of explanation. In addition, the size ratio of each part may be different from the actual size. First, a manufacturing apparatus of a glass molded body will be described.

<Overall Configuration of Manufacturing Apparatus>

As shown in Fig. 1, the apparatus 11 for manufacturing a glass molded body GC is a device for producing a glass molded body GC by flowing a molten glass MG onto a molding member 12 as an example of a molding movable body. The manufacturing apparatus 11 of the glass molded body GC is provided with the preliminary heating part 13 which inductively heats the molding member 12 before the molten glass MG contacts the molding member 12. The molten glass MG flows down from the nozzle 14 to the molding member 12, and the nozzle 14 is disposed above the molding member 12. The manufacturing apparatus 11 of the glass molded body GC is provided with the first automatic transfer line L1, and the first automatic transfer line L1 transports the plurality of molding members 12 from the position upstream of the preliminary heating unit 13 to the downstream side of the nozzle 14. The molten glass MG flows down to the plurality of forming members 12. The first automatic conveyance line L1 is configured to convey the molding member 12 to the take-out portion 15 , and the take-out portion 15 takes out the glass molded body GC that has been formed on the molding member 12 . The manufacturing apparatus 11 of the glass molded body GC further includes a second automatic transfer line L2, and the second automatic transfer line L2 returns the molding members 12 that have passed through the take-out unit 15 one by one or a plurality of them to the upstream of the preliminary heating unit 13 The first automatic transfer line L1 on the side.

<Shaping member 12>

The manufacturing apparatus 11 of the glass molded body GC of this embodiment is equipped with the some shaping|molding member 12. The molding member 12 is formed of a material having heat resistance and can withstand the heat of the molten glass MG. Examples of the material constituting the molding member 12 include a metal and a ceramic. The molding member 12 may be composed of a plurality of materials. For example, the molding member 12 may have a configuration in which a ceramic layer is laminated on a metal or a structure in which a metal layer is laminated on a ceramic. Further, the molding member 12 may have a structure in which a heat-resistant layer (for example, a spray coating film) such as boron nitride or heat-resistant steel is laminated on a metal plate such as cast iron.

The molding member 12 of the present embodiment has a flat plate shape (plate-like member) and has an outer shape of a quadrangular shape. The thickness of the molding member 12 is preferably 5 mm or more from the viewpoint of suppressing the deformation of the molding member 12 and suppressing the shape of the glass molded body GC. The thickness of the molding member 12 is preferably 50 mm or less from the viewpoint of, for example, easy replacement of the molding member 12. From the viewpoint of being suitable for induction heating, the molding member 12 is preferably made of a metal material, and the molding member 12 preferably contains 90% by mass of iron.

<nozzle 14>

The molten glass MG prepared in the melting furnace (not shown) is supplied to the nozzle 14 in the manufacturing apparatus 11 of the glass molded body GC. The molten glass MG supplied from the melting furnace may be refined in a refining chamber or the like. The shape of the opening of the tip end of the nozzle 14 may be, for example, a circular shape or a slit shape. Further, the nozzle 14 is preferably formed of platinum or a platinum alloy.

<Preparation heating unit 13>

The preliminary heating unit 13 in the manufacturing apparatus 11 of the glass molded body GC is provided with a preliminary heating device 17. The preliminary heating device 17 is provided on the upstream side of the nozzle 14 on the first automatic transfer line L1, and heats the molding member 12 that is conveyed toward the nozzle 14. The preliminary heating device 17 (high-frequency induction heating device) that inductively heats the molding member 12 includes a high-frequency power source 17a and an induction coil 17b. The molding member 12 passes through the inside of the induction coil 17b, and the molding member 12 generates heat by Joule heat. The frequency of the high-frequency power source 17a in the preliminary heating device 17 is preferably in the range of 50 Hz or more and 400 Hz or less. When the frequency of the high-frequency power source 17a is 50 Hz or more, the molding member 12 can be heated to a high temperature in a short time. When the frequency of the high-frequency power source 17a is 400 Hz or less, the temperature of the molding member 12 can be prevented from excessively rising.

<1st automatic transfer line L1>

As shown in FIG. 1 and FIG. 2, the first automatic conveyance line L1 conveys the molding member group 16 in the first conveyance direction MD1, and the molding member group 16 is composed of a plurality of molding members 12. The molding member group 16 is in a state in which the upstream end 12a of the molding member 12 located on the downstream side abuts on the downstream end 12b of the molding member 12 adjacent to the upstream side of the molding member 12. The upper surface of the molding member group 16 of the present embodiment is configured to have a continuous plane continuous in the first conveyance direction MD1, and the glass molded body GC is formed on the continuous plane.

The first conveyor C1 constituting the first automatic conveyance line L1 is constituted by, for example, a roller conveyor. The first conveyor C1 is driven by a drive unit (not shown). The first conveyor C1 is provided with a stacking mechanism 18 at a position upstream of the nozzle 14 . The accumulating mechanism 18 is provided with a plurality of stacking rolls 19. Each of the stacking rollers 19 is configured to be idling when the molding member 12 being conveyed is in contact with the molding member 12 on the downstream side to reduce the impact shock. In addition, the stacking roller 19 is configured to convey the molding member 12 at a conveying speed faster than the conveying speed of the stacking roller 19 on the downstream side of the stacking mechanism 18 in the first automatic transfer line L1. In other words, the stacking mechanism 18 can make the molding member 12 to be conveyed next to the molding member 12 that is conveyed downstream of the stacking mechanism 18, and can alleviate the impact shock at the time of catching up. When the downstream end 12b of the next molded member 12 is brought into contact with the upstream end 12a of the downstream forming member 12, the stacking mechanism 18 is configured to convey the upstream of the downstream forming member 12 and transport the upstream. The forming member 12 on the side. As such a stacking roller 19, a known stacking roller including a transmission structure that transmits a frictional resistance through a rotational driving force of a drive shaft is used.

<Dip of the first automatic transfer line L1>

The first automatic conveyance line L1 is configured such that the molding member 12 is inclined and conveyed so that the downstream end 12b of the molding member 12 is downward, and the inclined molding member 12 is conveyed from the upstream side of the nozzle 14 It is a position on the downstream side of the nozzle 14. In other words, in the manufacturing apparatus 11 of the glass molded body GC, the molten glass MG flows down to the molding member 12 which is inclined by the first automatic conveyance line L1.

The inclination angle θ of the first automatic conveyance line L1 (the first conveyor C1), that is, the inclination angle θ of the contact surface 12c contacting the glass G on the molding member 12 is preferably 1° or more and 10° or less, and more preferably 1 Above ° and below 5 °.

When the inclination angle θ is 1° or more, it is possible to appropriately suppress the retention of the glass G on the upstream side of the nozzle 14 on the molding member 12 . When the inclination angle θ is 10° or less, the conveyance of the molding member 12 is easily stabilized, and the glass G on the molding member 12 can be prevented from excessively flowing toward the downstream end 12b of the molding member 12.

The first conveyor C1 of the present embodiment includes a tilt angle changing mechanism 20 that can change the tilt angle θ. The inclination changing mechanism 20 is connected to, for example, the frame of the first conveyor C1. Examples of the inclination changing mechanism 20 include an adjustment bolt, a fluid cylinder such as a hydraulic cylinder and a pneumatic cylinder. In the present embodiment, the entire first conveyor C1 constituting the first automatic conveyance line L1 is configured to be inclined as described above. However, a part of the first conveyor C1 may be configured as an inclined portion. In this configuration, the molten glass MG flows down to the molding member 12 which is inclined at the inclined portion.

<Attached device of the first automatic transfer line L1>

The manufacturing apparatus 11 of the glass molded body GC is equipped with the roll 21, and the roll 21 rolls the glass G on the molding member 12 (forming component group 16). The roll 21 of the present embodiment is composed of an upstream side roll 21a and a downstream side roll 21b. A heater for raising the surface temperature of the roll 21 can be provided on the roll 21 as needed.

The manufacturing apparatus 11 of the glass molded body GC is equipped with the heating apparatus 22, and the heating apparatus 22 heats the glass G on the shaping|molding member 12 (forming component group 16). The heating device 22 includes an AC power source 22a and an electric heater 22b. The heating device 22 is configured to heat (maintain) the glass G on the molding member 12 (forming member group 16) to a temperature equal to or higher than, for example, the annealing point. The heating device 22 of the present embodiment is provided between the upstream side roll 21a and the downstream side roll 21b.

The manufacturing apparatus 11 of the glass molded body GC includes the cutting device 23, and the cutting device 23 cuts the glass G on the forming member group 16. The cutting device 23 includes, for example, a cutting line forming device that forms a cutting line on the glass G and a cutting device that applies an impact to the glass G on which the cutting line is formed. The cutting device 23 is preferably configured to cut the glass G at a boundary portion between the molding member 12 and the molding member 12 adjacent to the molding member 12.

The manufacturing apparatus 11 of the glass molded body GC is provided with an annealing furnace (not shown) on the upstream side of the cutting device 23. The annealing furnace is provided with a heat insulating wall, and the heat insulating wall covers the glass G conveyed on the first automatic transfer line L1 (first conveyor C1). The annealing furnace may also be provided with a heater for adjusting the annealing temperature of the glass G.

In the manufacturing apparatus 11 of the glass molded body GC, the take-out unit 15 is provided with, for example, a carry-out device, and the carry-out device includes an adsorption pad for adsorbing the glass molded body GC, and a glass molded body on the molding member 12 (forming member group 16). The GC is carried out from the first automatic transfer line L1.

<2nd automatic transfer line L2>

The second automatic transfer line L2 in the manufacturing apparatus 11 of the glass molded body GC includes the second conveyor C2 arranged in parallel with the first conveyor C1. The second automatic transfer line L2 further includes a first transfer mechanism 24 and a second transfer mechanism 25, and the first transfer mechanism 24 transfers the molding member 12 conveyed by the first conveyor C1 to the second conveyor C2. In the second transfer mechanism 25, the molding member 12 conveyed by the second conveyor C2 is transferred to the first conveyor C1.

The second conveyor C2 is configured by, for example, a roller conveyor, and conveys the molding member 12 along the second conveyance direction MD2. The second conveyance direction MD2 is the first conveyor 1 with the first conveyor C1 (the first automatic conveyance line L1). The direction of the transport direction MD1 is opposite. The second conveyor C2 of the present embodiment is disposed below the first conveyor, but the second conveyor C2 may be disposed not only below but also above the first conveyor C1.

The first transfer mechanism 24 includes a first placement portion 24a on which the molding member 12 is placed, and a first elevating mechanism 24b that moves the first placement portion 24a up and down. The first elevating mechanism 24b raises and lowers the first loading unit 24a at the loading position (upper position) and the unloading position (lower position), and the loading position is to carry the molding member 12 from the first conveyor C1 to the first placement. The position of the portion 24a and the carry-out position are positions at which the molding member 12 placed on the first placing portion 24a is carried out to the second conveyor C2.

The second transfer mechanism 25 includes a second placement portion 25a on which the molding member 12 is placed, and a second elevating mechanism 25b that moves the second placement portion 25a up and down. The second elevating mechanism 25b raises and lowers the second loading unit 25a at the loading position (lower position) and the unloading position (upper position), and the loading position is to carry the molding member 12 from the second conveyor C2 to the second placement. The position of the portion 25a and the carry-out position are positions at which the molding member 12 placed on the second placing portion 25a is carried out to the first conveyor C1.

The first mounting portion 24a and the second mounting portion 25a are configured by, for example, a roller conveyor, and are driven by a driving unit (not shown) to carry in and carry out the molding member 12. Examples of the first elevating mechanism 24b and the second elevating mechanism 25b include a mechanical elevating mechanism including a ball screw and a motor, and a fluid pressure elevating mechanism including a fluid cylinder such as a hydraulic cylinder or a pneumatic cylinder.

<Method for Producing Glass Forming Body GC>

As shown in FIG. 3(a), the method of manufacturing the glass molded body GC includes a forming step S1 and a returning step S2.

In the molding step S1, the first automatic conveyance line L1 described above is used. In the forming step S1, the first automatic conveying line L1 transports the plurality of molding members 12 that flow down the molten glass MG from the position upstream of the preliminary heating unit 13 to the downstream side of the nozzles 14. The first automatic conveyance line L1 conveys the molding member 12 to the take-out portion 15 , and the take-out portion 15 takes out the glass molded body GC formed on the molding member 12 .

As shown in FIG. 3(b), the molding step S1 of the present embodiment includes the following steps: a preliminary heating step S11, a downflow step S12, a first rolling step S13, a heating step S14, a second rolling step S15, and an annealing step S16. The cutting step S17 and the taking-out step S18.

The preliminary heating step S11 is a step of inductively heating the molding member 12 before the molten glass MG comes into contact with the molding member 12. The heating temperature of the molding member 12 in the preliminary heating step S11 is, for example, 200 ° C or more and 400 ° C or less. When the heating temperature of the molding member 12 is 200 ° C or more, the thermal shock of the glass G can be appropriately suppressed. When the heating temperature of the molding member 12 is 400 ° C or lower, it is possible to suppress excessive flow of the glass G on the molding member 12 .

The step S12 is a step of flowing the molten glass MG from the nozzle 14 to the molding member 12 (molding member group 16) conveyed on the first conveyor C1.

The first rolling step S13 is a step of rolling the glass G on the molding member 12 (forming member group 16) using the upstream side roll 21a. By the first rolling step S13, the glass G is fused to the molding member 12 (contact surface 12c), and variations in the thickness of the glass molded body GC can be suppressed.

The heating step S14 is a step of heating the glass G on the molding member 12 (forming member group 16) by the heating device 22. By the heating step S14, the strain of the glass G on the molding member 12 (forming member group 16) can be reduced. In addition, by the heating step S14, the glass G is fused to the molding member 12 (contact surface 12c), and variations in the thickness of the glass molded body GC can be suppressed.

The second rolling step S15 is a step of rolling the glass G on the molding member 12 (forming member group 16) using the downstream side roll 21b. The thickness of the glass molded body GC can be adjusted by the second rolling step S15.

The annealing step S16 is a step of annealing the glass G conveyed on the first conveyor C1 by using an annealing furnace (not shown). The strain of the glass G can be further reduced by the annealing step S16. The cutting step S17 is a step of cutting the long (band-shaped) glass G into a predetermined length by using the cutting device 23.

The take-out step S18 is a step of taking out the glass molded body GC on the molding member 12 (molding member group 16) by the take-out portion 15.

In the returning step S2, the second automatic transport line L2 is used. In the returning process S2, the second automatic transfer line L2 returns the molding member 12 that has passed through the take-out portion 15 to the first automatic transfer line L1 that is upstream of the preliminary heating unit 13.

In the manufacturing method of the glass molded body GC, the molding member S1 which is returned by the conveyance returning process S2 is further subjected to the molding step S1, whereby the glass molded body GC can be sequentially produced. In the method of manufacturing the glass molded body GC according to the present embodiment, the plurality of molding members 12 are used to pass the molding step S1 and the returning step S2 simultaneously.

Next, the position of the molding member 12 and the conveying speed will be described with reference to Fig. 4 . In addition, in FIG. 4, the transfer operation of the molding member 12 by the first transfer mechanism 24 and the second transfer mechanism 25 is omitted.

As shown in FIG. 4, in the time t0-t2, the molding member 12 is conveyed by the 1st automatic conveyance line L1 (1st conveyor C1). Here, at time t0-t1, the molding member 12 is conveyed by the stacking mechanism 18 of the first automatic conveyance line L1. The conveying speed of the molding member 12 is set so as to be able to catch up with the molding member 12 located on the downstream side. In the time t1, the upstream molding member 12 that is conveyed by the stacking mechanism 18 is in contact with the molding member 12 located on the downstream side, and is conveyed at the same conveyance speed as the conveying speed of the downstream molding member 12. . At time t1-t2, the molding member 12 (forming member group 16) is conveyed at a constant speed, and the molding step S1 is performed. In the time t2-t3, the returning process S2 using the second automatic transfer line L2 is performed. The conveyance speed of the molding member 12 on the second automatic conveyance line L2 (second conveyor C2) is set to be faster than the conveyance speed of the molding member 12 on the first automatic conveyance line L1 (first conveyor C1). In the time t3-t4, the molding member 12 returned to the first automatic conveyance line L1 is conveyed by the stacking mechanism 18 of the first automatic conveyance line L1, and the returned molding member is started to be used at time t4. Forming step S1 of 12.

The conveyance speed of the molding member 12 is controlled by a control unit (not shown). In addition, a sensor that detects the speed of the molding member 12 may be provided on the first automatic conveyance line L1 and the second automatic conveyance line L2 as needed, and the molding member 12 may be controlled based on the signal of the sensor. The speed of the transfer.

<Glass molded body GC>

The manufacturing apparatus 11 and the manufacturing method of the glass molded body GC of the present embodiment are suitable for the case where the glass molded body GC is produced using the molten glass MG having a low viscosity. The molten glass MG is preferably a molten glass having a composition capable of forming, for example, a glass molded body GC having a thermal expansion coefficient of 100 × 10 ^{- 7} /° C. or higher and containing P ₂ O ₅ at 30 to 300 ° C. The glass formed body GC is a molded body of, for example, fluorophosphates glass, and as a composition of the fluorophosphate glass, for example, expressed as a percentage of a cation: P ^{5 +} : 5-50%; Al ^{3 +} : 2-30% ; R' ⁺ (R' is at least one selected from Li, Na, and K): 10-40%; and R ^{2 +} (R ^{2 +} is from Mg ^{2 +} , Ca ^{2 +} , Sr ^{2 +} , Ba ^{2 +} and at least one selected from Zn ^{2 +} ): 20-50%, and expressed as a percentage of anion as containing F ^- : 5 ^- 80%, and O ^{2 -} : 20 ^- 95%. In addition, the percentage of the cation is the mass % of each cation when the total amount of the cations in the glass is 100% by mass, and the percentage of the anion is the mass % of each anion when the total amount of the anions in the glass is 100% by mass.

The thickness of the glass molded body GC is, for example, 0.5 mm or more and 10 mm or less. The glass molded body GC is used as, for example, an infrared absorbing glass product (optical product) after being subjected to processing such as polishing or cutting.

<action>

Next, the main action of the method of producing the glass molded body GC will be described.

The manufacturing method of the glass molded body GC includes a preliminary heating step S11, and the preliminary heating step S11 inductively heats the molding member 12 before the molten glass MG comes into contact with the molding member 12. According to this method, since the molding member 12 is heated by the preliminary heating step S11, the thermal shock of the glass G when the molten glass MG comes into contact with the molding member 12 is suppressed. In the preliminary heating step S11, since the induction heating is employed, the molding member 12 can be collectively heated, and the peripheral portion of the molding member 12 can be prevented from being heated.

According to the embodiment described in detail above, the following effects can be exhibited.

(1) The method of producing the glass molded body GC is a method of producing the glass molded body GC by flowing the molten glass MG onto the molding member 12, and further includes a preliminary heating step S11, and the preliminary heating step S11 in the molten glass MG and the molding member The forming member 12 is inductively heated before the contact. According to this method, since the above action is obtained, cracking of the glass G can be appropriately suppressed. Therefore, for example, the yield of the glass formed body GC can be improved.

(2) Induction heating is employed in the preliminary heating step S11 in the method of producing the glass molded body GC. In this case, the forming member 12 can be heated to a predetermined temperature in a relatively short period of time as compared with the case of heating with a medium. Therefore, for example, the production line of the glass formed body GC can be set short.

(3) In the preliminary heating step S11 in the method of manufacturing the glass molded body GC, the molding member 12 is conveyed by the first conveyor C1 and passed through the inside of the induction coil 17b to induce the molding member 12 heating. In this case, since the molding member 12 can be heated relatively uniformly, the cracking of the glass G can be appropriately suppressed.

(4) In the manufacturing method of the glass molded body GC, the molding member 12 is a molding member 12 having a thickness of 5 mm or more and comprising 90% by mass or more of iron, and the induction heating in the preliminary heating step is preferably employed. Induction heating of a high frequency of 50 Hz or more and 400 Hz or less.

In the case of this method, deformation of the molding member 12 can be suppressed and the molding member 12 can be appropriately heated. Therefore, the glass molded body GC can be manufactured more stably.

(5) In the manufacturing method of a glass molded body GC, MG preferably employed as the molten glass can be shaped having a thermal expansion coefficient at 30-300 deg.] C to 100 × 10 ^{- 7} / ℃ or more and a glass containing P ₂ O ₅ is molded GC The composition of the molten glass.

The glass molded body GC described above is particularly susceptible to breakage due to thermal shock. In the production of such a glass molded body GC, the method for producing the glass molded body GC including the preliminary heating step S11 is particularly effective.

(6) In the method of producing the glass molded body GC, the rolling step (the first rolling step S13 and the second rolling step S15) is further included, and the rolling step 21 uses the roll 21 to roll the glass G on the molding member 12. .

In the case of this method, it is possible to easily produce a plate-shaped glass molded body GC having a thinner thickness.

(7) The manufacturing apparatus 11 of the glass molded body GC is a device for producing the glass molded body GC by flowing the molten glass MG onto the molding member 12, and includes the preliminary heating unit 13, and the preliminary heating unit 13 in the molten glass MG and the molding member. The forming member 12 is inductively heated before the contact.

According to this configuration, the same operational effects as those of the above (1) can be obtained.

(8) The method of producing the glass molded body GC is a method of producing the glass molded body GC by flowing the molten glass MG from the nozzle 14, and includes a forming step S1 and a returning step S2. In the forming step S1, the glass molded body GC is formed by the first automatic transfer line L1, and the first automatic transfer line L1 transports the molding member 12 flowing down the molten glass MG from the position upstream of the preliminary heating unit 13 to the specific nozzle. 14 on the downstream side of the position. The first automatic conveyance line L1 conveys the molding member 12 to the take-out portion 15 , and the take-out portion 15 takes out the glass molded body GC formed on the molding member 12 . In the returning step S2, the second automatic transport line L2 is used, and the second automatic transport line L2 returns the molding member 12 that has passed through the take-out unit 15 to the first automatic transport line L1. The second automatic transfer line L2 returns the molding member 12 to a position upstream of the preliminary heating unit 13 .

In the case of this method, the molding member 12 from which the glass molded body GC is taken out is returned to the first automatic conveyance line L1 on the upstream side of the preliminary heating unit 13 through the returning step S2 using the second automatic transfer line L2. Therefore, the glass molded body GC can be produced by using the molding member 12 in reverse. In addition, the method of manufacturing the glass molded body GC by contacting the molten glass MG (glass G) with the mounting surface of the conveyor is manufactured by using the molding member 12 conveyed on the first automatic conveyance line L1. Method of glass forming body GC. Therefore, when a problem occurs in the contact surface 12c which is in contact with the molten glass MG in the molding member 12, for example, by replacing the molding member 12 with the spare molding member 12, the quality of the glass molded body GC can be maintained. . The replacement work of the molding member 12 does not require special work such as disassembling the first automatic conveyance line L1. Therefore, the glass molded body GC can be easily manufactured.

(9) In the manufacturing method of the glass molded body GC, the first automatic transfer line L1 is configured such that the molding member 12 is inclined and conveyed so that the downstream end 12b of the molding member 12 is downward, and the molten glass MG is formed. It flows down onto the inclined forming member 12.

In the case of this method, the glass G on the molding member 12 easily flows toward the downstream end 12b of the molding member 12. Therefore, in the molding member 12, it is difficult for the glass G to stay on the upstream side of the nozzle 14. By suppressing the retention of such a glass G, it is possible to reduce the occurrence frequency of, for example, streaks on the obtained glass molded body GC. Therefore, the yield of the glass formed body GC can be improved.

The inclination angle θ of the first automatic conveyance line L1 is preferably 1° or more and 10° or less, and more preferably 1° or more and 5° or less. When the inclination angle θ of the first automatic conveyance line L1 is 1° or more, the retention of the glass G can be appropriately suppressed. When the inclination angle θ of the first automatic conveyance line L1 is 10° or less, the conveyance of the molding member 12 can be easily stabilized, and the glass G on the molding member 12 can be prevented from being directed toward the first automatic conveyance line L1. The downstream end 12b flows excessively. Thereby, for example, the thickness of the glass formed body GC can be stabilized.

In addition, by suppressing excessive flow of the glass G on the molding member 12, for example, it is possible to suppress the glass G from remaining on the upstream side of the upstream side roll 21a. Therefore, the yield of the glass molded body GC can be improved by reducing the frequency of occurrence of, for example, streaks.

(10) In the method of manufacturing the glass molded body GC, the first automatic conveyance line L1 conveys the molding member group 16 composed of the plurality of molding members 12. The molding member group 16 is in a state in which the upstream end 12a of the molding member 12 on the downstream side is in contact with the downstream end 12b of the molding member 12 adjacent to the upstream side of the molding member 12, and in the molding step S1, The molten glass MG is continuously flowed down onto the forming member group 16 to form the glass molded body GC.

In the case of this method, the production efficiency of the glass molded body GC can be improved as compared with the case where the molten glass MG is intermittently flowed down to the plurality of molding members 12 to produce a plurality of glass molded bodies.

(11) In the method of producing the glass molded body GC, the upper surface of the forming member group 16 has a continuous plane continuous in the first conveying direction MD1 of the forming member group 16, and the glass molded body GC is formed on the continuous plane.

In the case of this method, the plate-shaped (flat-plate) glass molded body GC can be produced efficiently.

(12) In the method of manufacturing the glass molded body GC, the first automatic transfer line L1 includes the first conveyor C1. The second automatic transfer line L2 includes a second conveyor C2 that is arranged in parallel with the first conveyor C1, and a first transfer mechanism 24 that transfers the molding member 12 that is transported on the first conveyor C1 to The second conveyor C2 and the second transfer mechanism 25 transfer the molding member 12 conveyed on the second conveyor C2 to the first conveyor C1. In the case of this method, the second automatic transfer line L2 can be placed along the first automatic transfer line L1 at a position close to the first automatic transfer line L1, so that the installation area of the manufacturing apparatus 11 can be set small.

In the present embodiment, since the first conveyor C1 and the second conveyor C2 are arranged side by side in the vertical direction, the installation area of the manufacturing apparatus 11 of the glass molded body GC can be set smaller.

(13) In the method for producing a glass molded body GC, the glass G on the rolling forming member 12 is rolled in the rolling step.

In the case of this method, for example, the flatness of the plate-shaped glass molded body GC can be improved by the molding member 12 and the rolls 21. Therefore, for example, the polishing process of the glass formed body GC can be simplified.

(14) In the method for producing a glass molded body GC, the forming step S1 includes a heating step S14, and in the heating step S14, the glass G on the forming member 12 is heated.

In the case of this method, the internal stress of the glass G can be alleviated. Therefore, the quality of the obtained glass molded body GC can be improved.

(15) In the manufacturing method of the glass molded body GC, in the forming step S1, after the first rolling step S13 of the glass G on the rolling forming member 12, the forming member 12 is applied in the heating step S14. The glass G is heated.

In this case, the flatness of the plate-shaped glass molded body GC can be improved by the molding member 12 and the roll 21, and the internal stress of the glass G can be alleviated. Therefore, for example, the polishing process of the glass formed body GC can be simplified, and the quality of the obtained glass molded body GC can be improved.

(Modification)

The above embodiment may be configured as follows. In the following, for the sake of convenience of explanation, a modification of the manufacturing apparatus 11 of the glass molded body GC will be described, but the same can be applied to the method of manufacturing the glass molded body GC.

In the manufacturing apparatus 11 of the glass molded body GC, at least one of the upstream side roll 21a and the downstream side roll 21b may be omitted.

As shown in Fig. 5, the roll 21 in the manufacturing apparatus 11 of the glass molded body GC can be provided with a pair of gripping rolls 21c, in addition to the rolls 21a and 21b of the glass G on the rolling forming member 12. The molten glass MG before the contact with the forming member 12 is sandwiched and rolled by the pinch roll 21c. Even in this case, it is possible to easily produce a plate-shaped glass molded body GC having a thinner thickness. In the manufacturing apparatus 11 of the glass molded body GC, the roll 21 may be configured to include one of the upstream side roll 21a and the downstream side roll 21b, in addition to the pair of pinch rolls 21c.

In addition to the induction heating of the molding member 12, the preliminary heating unit 13 of the manufacturing apparatus 11 of the glass molded body GC may be changed to a medium for heating the molding member 12. In this case, the molding member 12 is made of a material including a dielectric such as ceramic. A preliminary heating device (high-frequency medium heating device) that performs medium heating includes a high-frequency power source and an electrode. Further, the preliminary heating unit 13 may be configured to heat the molding member 12 by induction heating and medium heating.

The preliminary heating unit 13 of the manufacturing apparatus 11 of the glass molded body GC has a configuration in which the molding member 12 passes through the inside of the induction coil 17b. For example, the preliminary heating unit may be changed such that the molding member 12 is inductively heated by the vicinity of the induction coil instead of passing through the inner side of the induction coil 17b.

In the manufacturing apparatus 11 of the glass molded body GC, the heating device 22 that heats the glass G on the molding member 12 can be omitted.

In place of the first conveyor C1 and the second conveyor C2 in the manufacturing apparatus 11 of the glass molded body GC, the first conveyor C1 and the second conveyor C2 are arranged side by side in the vertical direction, and may be arranged side by side in the left-right direction. In this case, the first transfer mechanism 24 and the second transfer mechanism 25 in the manufacturing apparatus 11 of the glass molded body GC may be changed to transfer mechanisms that respectively transfer the molding member 12 in the left-right direction. .

The first automatic conveyance line L1 and the second automatic conveyance line L2 in the manufacturing apparatus 11 of the glass molded body GC may be changed to a circulation conveyor that constitutes an endless conveyance path. In this case, a part of the transport path formed by the circulation conveyor can be used as the first automatic transport line L1 in the forming step S1, and the other portion of the transport path can be used as the second automatic in the returning step S2. It is used by transport line L2.

As shown in FIG. 6 , in the manufacturing apparatus 11 of the glass molded body GC, the take-out part 15 which removes the cutting device 23 and takes out the elongated glass as the glass molded body GC may be changed. In this case, the take-out portion 15 is provided with a support member 15a or the like that supports the elongated glass molded body GC in a state of being separated from the molding member 12.

As shown in FIG. 7 , in the manufacturing apparatus 11 of the glass molded body GC, the take-out portion 15 from which the glass molded body GC is taken out may be provided on the second placing portion 25 a of the second transfer mechanism 25 . In other words, in the manufacturing apparatus 11 of the glass molded body GC, the first automatic transfer line L1 in which the forming step S1 is performed may be performed by the first conveyor C1, the second conveyor C2, the first transfer mechanism 24, and the The transfer mechanism 25 is configured to include the second automatic transfer line L2 that performs the return process S2 by the second placement portion 25a of the second transfer mechanism 25. In this manner, the position at which the take-out portion 15 of the glass molded body GC is taken out is not limited to the first conveyor C1, and can be provided in the first transfer mechanism 24, the second conveyor C2, or the second transfer mechanism 25.

The outer shape of the molding member 12 is not limited to a square shape. For example, as shown in Fig. 8, the upstream end 12a of the molding member 12 may be formed into a convex shape, and the downstream end 12b of the molding member 12 may be formed into a concave shape. shape.

In the case where the molding member 12 is changed to, for example, a flat main body portion and a pair of upright walls are provided on both side edges thereof, the upper surface of the molding member group 16 can be formed along the edge. The first transport direction MD1 is a continuous continuous plane. In addition, even when the molding member 12 is changed to a configuration including a flat main body portion and a leg portion supporting the main body portion, the upper surface of the molding member group 16 can be formed in the first conveying direction MD1. Continuous continuous plane.

The molding member 12 may include a flat main body portion and an annular vertical wall that is erected on a peripheral portion of the main body portion. A plurality of such molding members may be used to change the upper surface of the molding member group to a plane that is discontinuous in the first conveyance direction MD1.

As shown in FIG. 9 , the first automatic transfer line L1 in the manufacturing apparatus 11 of the glass molded body GC is not limited to the configuration of the transport molding member group 16 , and may be a plurality of transported in the first transport direction MD1. The configuration of the molding member 12. In this case, the nozzles 14 may be configured such that the molten glass MG is not continuously discharged, but the molten glass MG may be intermittently flowed in synchronization with the conveyed molding member 12 .

The second automatic transfer line L2 in the manufacturing apparatus 11 of the glass molded body GC may be omitted.

The inclination changing mechanism 20 in the manufacturing apparatus 11 of the glass molded body GC may be omitted, and the inclination angle θ may be set by, for example, disposing a spacer between the base of the first conveyor C1 and the installation surface on which the base is placed.

In the manufacturing apparatus 11 of the glass molded body GC, the first automatic transfer line L1 is not inclined, for example, the molding member 12 is horizontally conveyed, or the first automatic transfer line L1 is formed at the downstream end 12b of the molding member 12. The way above is tilted.

In the manufacturing apparatus 11 of the glass molded body GC, the first conveyor C1 and the second conveyor C2 are not limited to the roller conveyor, and can be changed to a belt conveyor including an endless belt. That is, the molding member 12 is placed on a belt conveyor and conveyed.

As shown in Fig. 10, the manufacturing apparatus 11 of the glass molded body GC may be changed to a device in which the belt 26a of the belt conveyor 26 is used as a moving body for molding, and the molten glass MG is used instead of the molding member 12. The flow is made downward to manufacture a glass molded body GC. The belt 26a of the conveyor may be, for example, a flat belt having no holes, or may be a belt having a hole, such as a mesh belt or the like. Further, as the belt 26a (moving body for molding) of the conveyor, a configuration in which a plurality of sheets are connected may be employed.

11‧‧‧Manufacturing device for glass molded body
12‧‧‧Parts for forming (moving body for forming)
13‧‧‧Preparation heating department
17b‧‧‧Induction coil
21‧‧‧ Rolls
26‧‧‧Band (moving body for forming)
MG‧‧‧ molten glass
G‧‧‧glass
GC‧‧‧ glass molded body.

Fig. 1 is a partial side view schematically showing a manufacturing apparatus of a glass molded body. Fig. 2 is a partial perspective view schematically showing a manufacturing apparatus of a glass molded body. 3(a) and 3(b) are flowcharts illustrating a method of manufacturing the glass molded body of the embodiment. 4 is a timing chart showing the position of the molding member and the conveying speed. Fig. 5 is a partial side view showing a modification of the apparatus for manufacturing a glass molded body. Fig. 6 is a partial side view showing a modification of the apparatus for manufacturing a glass molded body. Fig. 7 is a partial side view showing a modification of the apparatus for manufacturing a glass molded body. 8 is a partial perspective view showing a modification of the apparatus for manufacturing a glass molded body. Fig. 9 is a partial side view showing a modification of the apparatus for manufacturing a glass molded body. Fig. 10 is a partial side view showing a modification of the apparatus for manufacturing a glass molded body.

C1‧‧‧1st conveyor

C2‧‧‧2nd conveyor

G‧‧‧glass

L1‧‧‧1st automatic conveyor line

L2‧‧‧2nd automatic conveyor line

MD1‧‧‧1st transport direction

MD2‧‧‧2nd moving direction

MG‧‧‧ molten glass

11‧‧‧Manufacturing device for glass molded body

12‧‧‧Parts for forming (moving body for forming)

13‧‧‧Preparation heating department

14‧‧‧Nozzles

16‧‧‧Forming component group

17‧‧‧ heating device

17a‧‧‧High frequency power supply

17b‧‧‧Induction coil

18‧‧‧Stacking institutions

19‧‧‧Stacking rolls

21‧‧‧ Rolls

21a‧‧‧Upstream side rolls

21b‧‧‧ downstream roll

22‧‧‧ heating device

22a‧‧‧AC power supply

22b‧‧‧Electric heater

25a‧‧‧2nd Mounting Department

Claims (7)

A method for producing a glass molded body, comprising: flowing a molten glass onto a moving body for molding to produce a glass molded body, comprising: a preliminary heating step, wherein the molten glass and the forming are performed in the preliminary heating step The forming movable body is electromagnetically heated before being contacted by the moving body. The method for producing a glass molded body according to claim 1, wherein the electromagnetic heating is induction heating. The method of producing a glass molded body according to claim 2, wherein the induction heating is carried out by transporting the molding movable body through a conveyor and passing it inside the induction coil. The method of producing a glass molded body according to claim 2, wherein the moving body for molding is a plate-shaped member having a thickness of 5 mm or more and a material containing 90% by mass or more of iron, Electromagnetic heating is induction heating using a high frequency of 50 Hz or more and 400 Hz or less. The method for producing a glass molded body according to any one of claims 1 to 4, characterized in that, as the molten glass, a thermal expansion coefficient which can be formed at 30 to 300 ° C is 100 × 10 ^{- 7} / A molten glass having a composition of a glass molded body of P ₂ O ₅ or more. The method for producing a glass molded body according to any one of claims 1 to 5, further comprising a rolling step of rolling the roll before the contact with the moving body for forming in the rolling step At least one of the molten glass and the glass on the moving body for forming. In the apparatus for producing a glass molded body, the glass molded body is produced by flowing the molten glass onto the moving body for molding, and is characterized in that it includes a preliminary heating unit in which the molten glass and the moving body for molding are formed. The forming movable body is electromagnetically heated before the contact.