JP2017095320A - Method and apparatus for manufacturing glass molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing a glass molding, capable of suitably suppressing the cracks of glass.SOLUTION: A method for manufacturing a glass molding GC, capable of flowing down a molten glass MG on a molding member 12 to manufacture the glass molding GC comprises the preheating step of induction-heating the molding member 12 before the molten glass MG contacts the molding member 12. An apparatus for manufacturing the glass molding comprises a preheating part 13 for induction-heating the molding member 12 before the molten glass MG contacts the molding member 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a glass molded body manufacturing method and a glass molded body manufacturing apparatus.

  2. Description of the Related Art Conventionally, a method is known in which molten glass is allowed to flow down on a placement portion of a conveyor and a glass molded body is manufactured on the placement portion (see Patent Document 1). The conveyor disclosed in Patent Document 1 includes an endless placement unit connected with a plurality of plates. Each plate which comprises the mounting part of a conveyor has a contact surface which contacts molten glass.

JP 2010-006665 A

  As in the above prior art, in the method of manufacturing a glass molded body by flowing molten glass on the placing portion of the conveyor, when the molten glass comes into contact with the placing portion, the glass is easily broken by heat shock. As a countermeasure against such cracking of the glass, it is effective to heat the placing part of the conveyor with an electric heater or burner before contacting the molten glass, but when the placing part is heated, the peripheral part of the placing part However, since it is easily heated to a relatively high temperature, there is a possibility that the peripheral portion of the mounting portion is deteriorated or the heating efficiency of the mounting portion is lowered. In addition, heating with an electric heater, a burner or the like is not time efficient, and there is a possibility that it cannot cope with an increase in tact time.

  This invention is made | formed in view of such a situation, The objective is to provide the manufacturing method of a glass molded object and the manufacturing apparatus of a glass molded object which can suppress the crack of glass suitably.

  A method for producing a glass molded body that solves the above-described problem is a method for producing a glass molded body in which a molten glass is caused to flow down on a movable body for molding, wherein the molten glass is the movable body for molding. A preheating step of electromagnetically heating the molding moving body before contacting the substrate.

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

In the manufacturing method of the said glass molded object, it is preferable that the said electromagnetic heating is induction heating.
According to this method, it becomes possible to heat the molding moving body to a predetermined temperature in a relatively short time compared to the case where dielectric heating is used as electromagnetic heating.

In the manufacturing method of the said glass molded object, it is preferable to pass through the inside of an induction coil, carrying out induction heating, conveying the said mobile body for shaping | molding with a conveyor.
According to this method, for example, the molding moving body can be heated relatively uniformly.

  In the manufacturing method of the said glass molded object, the said moving body for shaping | molding consists of a material containing 90 mass% or more of iron, and is a plate-shaped member with a thickness of 5 mm or more, The said electromagnetic heating is 50 Hz or more and 400 Hz or less. Induction heating using high frequency is preferable.

According to this method, deformation of the molding moving body can be suppressed and the molding moving body can be suitably heated.
In the method for producing a glass molded body, the molten glass has a thermal expansion coefficient of 100 × 10 ⁻⁷ / ° C. or higher at 30 to 300 ° C., and a composition for molding a glass molded body containing P ₂ O _5. It is preferable to use a molten glass.

Said glass molded object is easy to be damaged especially by heat shock. When manufacturing such a glass molded object, said preheating process becomes especially advantageous.
In the manufacturing method of the said glass molded object, it is preferable to further provide the rolling process which rolls at least one of the molten glass before contacting the said moving body for shaping | molding, and the glass on the said moving body for shaping | molding with a rolling roller.

  According to this method, it is possible to easily manufacture a thin plate-shaped glass molded body. In this document, the glass being formed on the forming moving body is simply referred to as glass even in a molten state.

  An apparatus for manufacturing a glass molded body that solves the above problems is a glass molded body manufacturing apparatus for manufacturing a glass molded body by causing molten glass to flow down on a molding movable body, wherein the molten glass is the molding mobile body. A preheating unit that electromagnetically heats the molding moving body before contacting the surface.

  According to the present invention, breakage of glass can be suitably suppressed.

It is a partial side view which shows typically the manufacturing apparatus of a glass molded object. It is a fragmentary perspective view which shows typically the manufacturing apparatus of a glass molded object. (A) And (b) is a flowchart explaining the manufacturing method of the glass forming body of this embodiment. It is a time chart which shows the position and conveyance speed of the member for shaping | molding. It is a partial side view which shows the example of a change of the manufacturing apparatus of a glass molded object. It is a partial side view which shows the example of a change of the manufacturing apparatus of a glass molded object. It is a partial side view which shows the example of a change of the manufacturing apparatus of a glass molded object. It is a fragmentary perspective view which shows the example of a change of the manufacturing apparatus of a glass molded object. It is a partial side view which shows the example of a change of the manufacturing apparatus of a glass molded object. It is a partial side view which shows the example of a change of the manufacturing apparatus of a glass molded object.

  Hereinafter, an embodiment of a manufacturing method of a glass forming object and a manufacturing device of a glass forming object is described with reference to drawings. Note that in the drawings, some of the components may be exaggerated for convenience of explanation. Further, the dimensional ratio of each part may be different from the actual one. First, the manufacturing apparatus of a glass molded object is demonstrated.

<Overall configuration of manufacturing equipment>
As shown in FIG. 1, the glass molded body GC manufacturing apparatus 11 is an apparatus that manufactures a glass molded body GC by flowing molten glass MG onto a molding member 12 that is an example of a molding moving body. The glass molded body manufacturing apparatus 11 includes a preheating unit 13 that induction-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 disposed above the molding member 12. The glass molded body manufacturing apparatus 11 includes a first automatic conveyance line L1 that conveys a plurality of molding members 12 through which the molten glass MG flows down from the upstream side of the preheating unit 13 to the downstream side of the nozzles 14. ing. The 1st automatic conveyance line L1 is comprised so that the member 12 for shaping | molding may be conveyed to the extraction part 15 which takes out the glass molded object GC shape | molded on the member 12 for shaping | molding. The manufacturing apparatus 11 for the glass molded body GC returns the molding member 12 that has passed through the take-out portion 15 individually to the first automatic conveyance line L1 on the upstream side of the preheating unit 13, or returns a plurality of sheets collectively. An automatic transfer line L2 is further provided.

<Molding member 12>
The glass molded body GC manufacturing apparatus 11 of the present embodiment includes a plurality of molding members 12. The forming member 12 is formed of a material having heat resistance that can withstand the heat of the molten glass MG. Examples of the material constituting the forming member 12 include metals and ceramics. The molding member 12 may be composed of a plurality of materials. For example, the forming member 12 may have a configuration in which a ceramic layer is stacked on a metal, or a configuration in which a metal layer is stacked on a ceramic. Further, the forming member 12 may have a configuration in which a heat-resistant layer (for example, a sprayed 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 member), and the outer shape is a square shape. The thickness of the molding member 12 is preferably 5 mm or more from the viewpoint of stabilizing the shape of the glass molded body GC by suppressing deformation of the molding member 12. For example, the thickness of the molding member 12 is preferably 50 mm or less from the viewpoint that the molding member 12 can be easily replaced. Since the molding member 12 is 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>
Molten glass MG prepared in a melting furnace (not shown) is supplied to the nozzle 14 in the manufacturing apparatus 11 for the glass molded body GC. The molten glass MG supplied from the melting furnace may be clarified in a clarification chamber or the like. The shape of the opening at the tip of the nozzle 14 may be, for example, a circle or a slit. The nozzle 14 is preferably formed from platinum or a platinum alloy.

<Preheating unit 13>
The preheating unit 13 in the glass molded body GC manufacturing apparatus 11 includes a preheating apparatus 17. The preheating device 17 is provided on the upstream side of the nozzles 14 in the first automatic conveyance line L1 and heats the molding member 12 conveyed toward the nozzles 14. A preheating device 17 (high frequency induction heating device) for induction heating the forming member 12 includes a high frequency power source 17a and an induction coil 17b. When the molding member 12 passes inside the induction coil 17b, the molding member 12 generates heat due to Joule heat. The frequency of the high-frequency power source 17a in the preheating device 17 is preferably in the range of 50 Hz to 400 Hz. When the frequency of the high frequency power supply 17a is 50 Hz or more, the molding member 12 can be heated to a high temperature in a shorter time. When the frequency of the high frequency power supply 17a is 400 Hz or less, the temperature of the molding member 12 can be prevented from rising excessively.

<First automatic transfer line L1>
As shown in FIGS. 1 and 2, the first automatic conveyance line L1 conveys a molding member group 16 composed of a plurality of molding members 12 in the first conveyance direction MD1. In the molding member group 16, the upstream end 12 a of the molding member 12 positioned on the downstream side and the downstream end 12 b of the molding member 12 adjacent to the upstream side of the molding member 12 are in contact with each other. Yes. The upper surface of the molding member group 16 of the present embodiment has a continuous plane that is continuous along the first transport direction MD1, and is configured such that the glass molded body GC is molded on the continuous plane.

  The 1st conveyor C1 which comprises the 1st automatic conveyance line L1 is comprised from a roller conveyor, for example. The first conveyor C1 is driven by a drive unit (not shown). The first conveyor C1 includes an accumulating mechanism 18 on the upstream side of the nozzle 14. The accumulating mechanism 18 includes a plurality of accumulating rollers 19. Each of the accumulation rollers 19 is configured such that when the forming member 12 being conveyed comes into contact with the forming member 12 on the downstream side, the accumulation roller 19 idles and can reduce the impact of the collision. In addition, the accumulation roller 19 is configured to be able to convey the molding member 12 at a conveyance speed faster than the conveyance speed downstream of the accumulating mechanism 18 in the first automatic conveyance line L1. In other words, the accumulating mechanism 18 causes the molding member 12 conveyed downstream of the accumulating mechanism 18 to catch up with the molding member 12 conveyed next, and suppresses the impact of the collision at that time. It is possible. The accumulating mechanism 18 conveys the downstream molding member 12 when the downstream end 12b of the molding member 12 to be conveyed next contacts the upstream end 12a of the downstream molding member 12. The upstream forming member 12 is conveyed following the above. As such an accumulating roller 19, a well-known one having a transmission structure in which the rotational driving force of the driving shaft is transmitted via a frictional resistance can be used.

<Inclination angle of the first automatic transfer line L1>
The first automatic conveyance line L1 has a configuration in which the molding member 12 is conveyed while being inclined so that the downstream end 12b of the molding member 12 is downward, and the inclined molding member 12 is upstream of the nozzle. From the nozzle 14 to the downstream side. That is, in the manufacturing apparatus 11 for the glass molded body GC, the molten glass MG flows down to the molding member 12 inclined by the first automatic conveyance line L1.

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

  When the inclination angle θ is 1 ° or more, the glass G can be suitably prevented from staying on the molding member 12 at a position upstream of the nozzle 14. When the tilt 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 flows excessively toward the downstream end 12b of the molding member 12. Can be suppressed.

  The first conveyor C1 of this embodiment includes an inclination angle changing mechanism 20 that can change the inclination angle θ. The inclination angle changing mechanism 20 is connected to the frame of the first conveyor C1, for example. Examples of the tilt angle changing mechanism 20 include jack bolts and hydraulic cylinders such as hydraulic pressure and air. In addition, in this embodiment, although the whole 1st conveyor C1 which comprises the 1st automatic conveyance line L1 is the structure inclined as mentioned above, a part of 1st conveyor C1 is comprised as an inclination part, and the inclination You may comprise so that the molten glass MG may flow down to the shaping | molding member 12 inclined by the part.

<Auxiliary facilities for the first automatic transfer line L1>
The manufacturing apparatus 11 of the glass molded body GC includes a rolling roller 21 that rolls the glass G on the molding member 12 (molding member group 16). The rolling roller 21 of this embodiment is comprised from the upstream rolling roller 21a and the downstream rolling roller 21b. The rolling roller 21 can be provided with a heater that increases the surface temperature as necessary.

  The manufacturing apparatus 11 of the glass molded body GC includes a heating device 22 that heats the glass G on the molding member 12 (molding member 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 (molding member group 16) to a temperature equal to or higher than the annealing point, for example. The heating device 22 of this embodiment is provided between the upstream rolling roller 21a and the downstream rolling roller 21b.

  The glass molded body GC manufacturing apparatus 11 includes a cutting device 23 for cutting the glass G on the molding member group 16. The cutting device 23 includes, for example, a breaking line forming device that forms a breaking line on the glass G, and a breaking device that applies an impact to the glass G on which the breaking 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 for the glass molded body GC includes a slow cooling furnace (not shown) on the upstream side of the cutting device 23. The slow cooling furnace includes a heat insulating wall that covers the glass G conveyed by the first automatic conveyance line L1 (first conveyor C1). The slow cooling furnace may include a heater for adjusting the slow cooling temperature of the glass G.

  In the manufacturing apparatus 11 for the glass molded body GC, the take-out unit 15 described above is provided with, for example, a carry-out device provided with a suction pad that adsorbs the glass molded body GC, and is formed on the molding member 12 (molding member group 16). The glass molded body GC is unloaded from the first automatic transfer line L1.

<Second automatic transfer line L2>
The 2nd automatic conveyance line L2 in the manufacturing apparatus 11 of the glass forming body GC is provided with the 2nd conveyor C2 arrange | positioned in parallel with the 1st conveyor C1. The second automatic conveyance line L2 includes a first transfer mechanism 24 that transfers the molding member 12 conveyed by the first conveyor C1 to the second conveyor C2, and the molding member 12 conveyed by the second conveyor C2. And a second transfer mechanism 25 for transferring to the first conveyor C1.

  The second conveyor C2 is composed of, for example, a roller conveyor, and the molding member 12 is placed in a second transport direction MD2 that is opposite to the first transport direction MD1 of the first conveyor C1 (first automatic transport line L1). Transport. Although the 2nd conveyor C2 of this embodiment is arranged below the 1st conveyor, it is also possible to arrange above the 1st conveyor C1.

  The 1st transfer mechanism 24 is provided with the 1st mounting part 24a in which the member 12 for shaping | molding is mounted, and the 1st raising / lowering mechanism 24b which raises / lowers the 1st mounting part 24a. The first elevating mechanism 24b includes a carry-in position (upper position) for carrying the molding member 12 from the first conveyor C1 to the first placement portion 24a, and a molding member 12 placed on the first placement portion 24a. The 1st mounting part 24a is raised / lowered to the carrying-out position (lower position) carried out to the 2nd conveyor C2.

  The 2nd transfer mechanism 25 is provided with the 2nd mounting part 25a in which the member 12 for shaping | molding is mounted, and the 2nd raising / lowering mechanism 25b which raises / lowers the 2nd mounting part 25a. The second elevating mechanism 25b includes a carry-in position (lower position) where the molding member 12 is carried from the second conveyor C2 to the second placement unit 25a, and the molding member 12 placed on the second placement unit 25a. Is moved up and down to the unloading position (upper position) for unloading to the first conveyor C1.

  The 1st mounting part 24a and the 2nd mounting part 25a are comprised by a roller conveyor, for example, and carrying in and carrying out of the shaping | molding member 12 are driven by the drive part which abbreviate | omitted illustration. Examples of the first elevating mechanism 24b and the second elevating mechanism 25b include a mechanical elevating mechanism including a ball screw, a motor, and the like, and a fluid pressure elevating mechanism including a hydraulic cylinder such as hydraulic pressure and air. .

<Method for producing glass molded body GC>
As shown to Fig.3 (a), the manufacturing method of the glass forming body GC is equipped with shaping | molding process S1 and return process S2.

  In the molding step S1, the first automatic transport line L1 described above is used. In the molding step S <b> 1, the first automatic conveyance line L <b> 1 conveys the plurality of molding members 12 from which the molten glass MG flows down from the upstream side of the preheating unit 13 to the downstream side of the nozzles 14. The 1st automatic conveyance line L1 conveys the forming member 12 to the extraction part 15 which takes out the glass forming body GC shape | molded on the forming member 12. As shown in FIG.

  As shown in FIG. 3B, the forming step S1 of the present embodiment includes a preheating step S11, a flow-down step S12, a first rolling step S13, a heating step S14, a second rolling step S15, a slow cooling step S16, cutting. Step S17 and extraction step S18 are provided.

  The preheating step S11 is a step of induction heating the molding member 12 before the molten glass MG contacts the molding member 12. The heating temperature of the molding member 12 in the preheating 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 higher, the heat shock of the glass G can be suitably suppressed. When the heating temperature of the molding member 12 is 400 ° C. or less, the glass G can be prevented from flowing excessively on the molding member 12.

The flow-down step S12 is a step of flowing the molten glass MG from the nozzle 14 onto 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 forming member 12 (forming member group 16) using the upstream rolling roller 21a. By making the glass G conform to the molding member 12 (contact surface 12c) by the first rolling step S13, variation 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 (molding member group 16) using the heating device 22. By this heating step S14, it is possible to reduce the distortion of the glass G on the molding member 12 (molding member group 16). Moreover, the variation in the thickness of the glass molded body GC can be suppressed by adapting the glass G onto the molding member 12 (contact surface 12c) by the heating step S14.

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

  The slow cooling step S16 is a step of slowly cooling the glass G being conveyed on the first conveyor C1 using a slow cooling furnace (not shown). By this slow cooling step S16, the distortion of the glass G can be further reduced. The cutting step S <b> 17 is a step of cutting the long (band-shaped) glass G into a predetermined length using the cutting device 23.

The extraction step S18 is a step of extracting the glass molded body GC on the molding member 12 (molding member group 16) at the extraction portion 15.
In the return step S2, the above-described second automatic transport line L2 is used. In the return step S2, the second automatic conveyance line L2 returns the molding member 12 that has passed through the take-out part 15 to the first automatic conveyance line L1 upstream of the preheating part 13.

  In the manufacturing method of the glass molded body GC, the glass molded body GC can be sequentially manufactured by further performing the molding step S1 using the molding member 12 returned in the returning step S2. In the manufacturing method of the glass molded body GC in the present embodiment, the molding step S1 and the return step S2 are simultaneously advanced by using a plurality of molding members 12.

  Next, the position and conveying speed of the molding member 12 will be described with reference to FIG. 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, at time t0 to t2, the molding member 12 is conveyed by the first automatic conveyance line L1 (first conveyor C1). Here, at time t <b> 0 to t <b> 1, the molding member 12 is transported by the accumulating mechanism 18 of the first automatic transport line L <b> 1. The conveying speed of the molding member 12 is set so as to catch up with the molding member 12 on the downstream side. At time t1, the upstream molding member 12 conveyed by the accumulating mechanism 18 abuts on the downstream molding member 12 and is conveyed at the same conveyance speed as that of the downstream molding member 12. The From time t1 to t2, the molding member 12 (molding member group 16) is conveyed at a constant speed, and the molding step S1 is performed. From time t2 to t3, the return process S2 using the second automatic transport line L2 is performed. The conveyance speed of the molding member 12 on the second automatic conveyance line L2 (second conveyor C2) is higher than the conveyance speed of the molding member 12 on the first automatic conveyance line L1 (first conveyor C1). Is set to At time t3 to t4, the molding member 12 returned to the first automatic conveyance line L1 is conveyed by the accumulating mechanism 18 of the first automatic conveyance line L1, and at time t4, the returned molding member 12 was used. The molding step S1 is started.

  As shown in FIG. 4, at time t0 to t2, the molding member 12 is conveyed by the first automatic conveyance line L1 (first conveyor C1). Here, the conveyance speed at time t0 to t1 is the conveyance speed until the molding member 12 conveyed by the accumulating mechanism 18 of the first automatic conveyance line L1 catches up with the molding member 12 on the downstream side. That is, at time t1, the upstream molding member 12 conveyed by the accumulating mechanism 18 catches up with the downstream molding member 12, so that the conveyance speed of the upstream molding member 12 is reduced to the downstream side. The conveying speed of the molding member 12 is reduced. From time t1 to t2, the molding member 12 (molding member group 16) is conveyed at a constant speed, and the molding step S1 is performed. From time t2 to t3, the return process S2 using the second automatic transport line L2 is performed. The conveyance speed of the second conveyor C2 of the second automatic conveyance line L2 is set to a conveyance speed faster than that of the first conveyor C1 of the first automatic conveyance line L1. At time t3 to t4, the molding member 12 returned to the first automatic conveyance line L1 is conveyed by the accumulating mechanism 18 of the first automatic conveyance line L1, and after the time t4, the returned molding member 12 is used. The forming step S1 was performed.

  The conveyance speed of the molding member 12 is controlled by a control unit (not shown). The first automatic conveyance line L1 and the second automatic conveyance line L2 may be provided with a sensor for detecting the molding member 12 as necessary, and the conveyance speed may be controlled based on the signal of the sensor.

<Glass compact GC>
The manufacturing apparatus 11 and manufacturing method of the glass molded body GC of this embodiment are suitable when manufacturing the glass molded body GC using the relatively low-viscosity molten glass MG. As the molten glass MG, for example, a glass molded body GC having a composition in which the thermal expansion coefficient of the glass molded body GC is 100 × 10 ⁻⁷ / ° C. or higher at 30 to 300 ° C. and contains P ₂ O ₅ is obtained. Are preferred. The glass molded product GC is, for example, a molded product of fluorophosphate glass, and the composition of the fluorophosphate glass is, for example, expressed as cation%, P ⁵⁺ : 5 to 50%, Al ³⁺ : 2 to 30%, R ′ ⁺ (R ′ is at least one selected from Li, Na and K): 10 to 40%, and R ²⁺ (R ²⁺ is selected from Mg ²⁺ , Ca ²⁺ , Sr ²⁺ , Ba ²⁺ and Zn ^2+). At least one selected from the group consisting of 20 to 50% and anion%, F ⁻ : 5 to 80% and O ²⁻ : 20 to 95%. The cation% display is the mass% of each cation when the total amount of cations in the glass is 100% by mass, and the anion% display is each anion when the total amount of anions in the glass is 100% by mass. % By mass.

  The thickness of the glass molded body GC is, for example, not less than 0.5 mm and not more than 10 mm. The glass molded body GC is subjected to processing such as polishing and cutting, and is used, for example, as an infrared absorbing glass article (optical article).

<Action>
Next, the main effect | action of the manufacturing method of the glass forming body GC is demonstrated.
The manufacturing method of the glass molded body GC includes a preheating step S11 for inductively heating the molding member 12 before the molten glass MG contacts the molding member 12. According to this method, since the molding member 12 is heated in the preheating step S11, the heat shock of the glass G can be suppressed when the molten glass MG comes into contact with the molding member 12. In this preheating step S11, since induction heating is used, it is possible to heat the molding member 12 intensively, and it is possible to suppress the peripheral portion of the molding member 12 from being heated.

According to the embodiment described in detail above, the following operational effects are exhibited.
(1) The manufacturing method of the glass forming body GC is a method for manufacturing the glass forming body GC by causing the molten glass MG to flow down on the forming member 12. The manufacturing method of the glass molded body GC includes a preheating step S11 for inductively heating the molding member 12 before the molten glass MG contacts the molding member 12. According to this method, since the above-described action can be obtained, the glass G can be suitably prevented from cracking. Therefore, for example, the yield of the glass molded body GC can be improved.

  (2) In the preheating step S11 in the method for manufacturing the glass molded body GC, induction heating is used. In this case, the molding member 12 can be heated to a predetermined temperature in a relatively short time compared with the case where dielectric heating is used. Therefore, for example, the production line of the glass molded body GC can be shortened.

  (3) In the preheating step S11 in the method of manufacturing the glass molded body GC, the forming member 12 is passed through the inside of the induction coil 17b while being conveyed by the first conveyor C1, and induction heating is performed. In this case, since it becomes possible to heat the shaping | molding member 12 comparatively uniformly, the crack of the glass G can be suppressed suitably.

  (4) In the method for producing the glass molded body GC, the molding member 12 is made of a material containing 90% by mass or more of iron, and is a molding member 12 having a thickness of 5 mm or more. Induction heating using a high frequency of 50 Hz or more and 400 Hz or less is preferable.

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

(5) In the manufacturing method of the glass molded body GC, as the molten glass MG, a glass molded body GC having a thermal expansion coefficient of 100 × 10 ⁻⁷ / ° C. or higher at 30 to 300 ° C. and containing P ₂ O ₅ is molded. It is preferable to use a molten glass having the composition described above.

  The glass molded body GC is easily damaged by a heat shock. When manufacturing such a glass molding GC, the manufacturing method of glass molding GC provided with said preheating process S11 becomes especially advantageous.

  (6) The manufacturing method of the glass molded body GC further includes a rolling process (first rolling process S13 and second rolling process S15) in which the glass G on the molding member 12 is rolled by the rolling roller 21.

In the case of this method, it is possible to easily manufacture a thin plate-like glass molded body GC.
(7) The glass molded body GC manufacturing apparatus 11 is an apparatus for manufacturing the glass molded body GC by causing the molten glass MG to flow down on the molding member 12. The glass molded body manufacturing apparatus 11 includes a preheating unit 13 that induction-heats the molding member 12 before the molten glass MG contacts the molding member 12.

According to this configuration, the same effect as the effect described in the above section (1) can be obtained.
(8) The manufacturing method of the glass molded body GC is a method for manufacturing the glass molded body GC by causing the molten glass MG to flow down from the nozzle 14, and includes a forming step S1 and a returning step S2. In the molding step S1, the glass molded body GC is molded using the first automatic transport line L1 that transports the molding member 12 through which the molten glass MG flows down from the upstream side of the preheating unit 13 to the downstream side of the nozzle 14. To do. The 1st automatic conveyance line L1 conveys the forming member 12 to the extraction part 15 which takes out the glass forming body GC shape | molded on the forming member 12. As shown in FIG. In the return process S2, the second automatic conveyance line L2 for returning the molding member 12 that has passed through the take-out portion 15 to the first automatic conveyance line L1 is used. The second automatic conveyance line L2 returns to the upstream side of the preheating unit 13.

  In the case of this method, the molding member 12 from which the glass molded body GC has been taken out is returned to the first automatic conveyance line L1 upstream of the preheating unit 13 by the return step S2 using the second automatic conveyance line L2. Therefore, the glass molded body GC can be manufactured by repeatedly using the molding member 12. Moreover, the said method uses the member 12 for shaping | molding conveyed with the 1st automatic conveyance line L1 instead of the method of making molten glass MG (glass G) contact the mounting surface of a conveyor, and manufacturing the glass molded object GC. This is a method for producing a glass molded body GC. For this reason, for example, when a problem occurs in the contact surface 12c of the molding member 12 with the molten glass MG, the quality of the glass molded body GC is improved by replacing the molding member 12 with a preliminary molding member 12. Can be maintained. Such replacement work of the molding member 12 does not require special work such as disassembly work of the first automatic transport 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 conveyance line L1 is provided with a configuration in which the molding member 12 is conveyed while being inclined so that the downstream end 12b of the molding member 12 is positioned downward. The molten glass MG is flowing down to the molding member 12.

  In the case of this method, the glass G on the molding member 12 tends to flow toward the downstream end 12 b of the molding member 12. For this reason, it is difficult for the glass G to stay on the molding member 12 at a position upstream of the nozzle 14. By suppressing such stagnation of the glass G, for example, the frequency of occurrence of striae can be reduced in the obtained glass molded body GC. Therefore, the yield of the glass molded 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, 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 above-described retention of the glass G can be suitably suppressed. When the inclination angle θ of the first automatic conveyance line L1 is 10 ° or less, the conveyance of the molding member 12 is easily stabilized, and the glass G on the molding member 12 is directed to the downstream end 12b of the first automatic conveyance line L1. It is possible to suppress excessive flow toward the surface. Thereby, for example, it becomes possible to stabilize the thickness of the glass molded body GC.

  Further, by suppressing the excessive flow of the glass G on the molding member 12, for example, it is possible to suppress the glass G from staying on the upstream side of the upstream side rolling roller 21a. Therefore, for example, by reducing the occurrence frequency of striae, the yield of the glass molded body GC can be improved.

  (10) In the method for manufacturing the glass molded body GC, the first automatic conveyance line L1 conveys a molding member group 16 including a plurality of molding members 12. The molding member group 16 is in a state where the upstream end 12a of the molding member 12 located on the downstream side and the downstream end 12b of the molding member 12 adjacent to the upstream side of the molding member 12 are in contact with each other. In the molding step S1, the molten glass MG is continuously flowed down on the molding member group 16 to mold the glass molded body GC.

In the case of this method, it is possible to increase the productivity of the glass molded body GC rather than manufacturing the plurality of glass molded bodies by intermittently flowing the molten glass MG to the plurality of molding members 12.
(11) In the method of manufacturing the glass molded body GC, the upper surface of the molding member group 16 has a continuous plane continuous along the first transport direction MD1 of the molding member group 16, and the glass molded body is on the continuous plane. GC is molded.

In the case of this method, a plate-like (flat plate) glass molded body GC can be efficiently produced.
(12) In the method for manufacturing the glass molded body GC, the first automatic conveyance line L1 includes a first conveyor C1. The second automatic conveyance line L2 includes a second conveyor C2 arranged in parallel to the first conveyor C1, and a first transfer mechanism 24 that transfers the molding member 12 conveyed by the first conveyor C1 to the second conveyor C2. And a second transfer mechanism 25 that transfers the molding member 12 conveyed by the second conveyor C2 to the first conveyor C1. In the case of this method, since the second automatic transfer line L2 can be installed at a position close to the first automatic transfer line L1, the installation area of the manufacturing apparatus 11 can be made relatively small.

  In this embodiment, since the 1st conveyor C1 and the 2nd conveyor C2 are arranged in parallel up and down, it becomes possible to further reduce the installation area of the manufacturing apparatus 11 of the glass molded body GC.

(13) In the rolling step in the method for producing the glass molded body GC, the glass G on the molding member 12 is rolled.
In the case of this method, for example, the flatness of the plate-like glass molded body GC can be increased using the molding member 12 and the rolling roller 21. Therefore, for example, it is possible to simplify the polishing process of the glass molded body GC.

(14) In the method for manufacturing the glass molded body GC, the molding step S1 includes a heating step S14 for heating the glass G on the molding member 12.
In the case of this method, the internal stress of the glass G can be relaxed. Therefore, it is possible to improve the quality of the obtained glass molded body GC.

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

  In this case, the flatness of the plate-like glass molded body GC can be increased using the molding member 12 and the rolling roller 21, and the internal stress of the glass G can be relaxed. Therefore, for example, it is possible to simplify the polishing process of the glass molded body GC, and it is possible to improve the quality of the obtained glass molded body GC.

(Example of change)
The above embodiment may be modified as follows. In the following, for the sake of convenience of explanation, a modified example of the glass molded body GC manufacturing apparatus 11 will be described, but the glass molded body GC manufacturing method can be similarly modified.

-In the manufacturing apparatus 11 of the glass forming body GC, you may abbreviate | omit at least one rolling roller 21 of the upstream rolling roller 21a and the downstream rolling roller 21b.
-As shown in FIG. 5, as the rolling roller 21 in the manufacturing apparatus 11 of the glass forming body GC, in addition to the rolling roller 21 that rolls the glass G on the forming member 12, melting before contacting the forming member 12 is performed. A pair of sandwiching type rolling rollers 21c that sandwich and roll the glass MG can also be provided. Even in this case, it is possible to easily manufacture a plate-like glass molded body GC having a thinner thickness. In addition, the manufacturing apparatus 11 of the glass molded body GC includes, as the rolling roller 21, in addition to the pair of sandwich-type rolling rollers 21c, one of the upstream rolling roller 21a and the downstream rolling roller 21b. You may change to

  -Although the preheating part 13 of the manufacturing apparatus 11 of the glass forming body GC is equipped with the structure which induction-heats the member 12 for shaping | molding, it can also be changed into the structure which dielectrically heats the member 12 for shaping | molding. In this case, the molding member 12 is made of a material containing a dielectric such as ceramics. A preheating device (high-frequency dielectric heating device) that performs dielectric heating includes a high-frequency power source and electrodes. Further, the preheating unit 13 may be configured to heat the molding member 12 by using induction heating and dielectric heating in combination.

  -The preheating part 13 of the manufacturing apparatus 11 of the glass molded body GC is equipped with the structure which makes the member 12 for shaping | molding pass inside the induction coil 17b. For example, you may change into the preheating part which makes the member 12 for shaping | molding pass the vicinity of an induction coil instead of the inner side of the induction coil 17b, and induction-heats the member 12 for shaping | molding.

-In the manufacturing apparatus 11 of the glass molded object GC, the heating apparatus 22 which heats the glass G on the shaping | molding member 12 can also be abbreviate | omitted.
-Although the 1st conveyor C1 and the 2nd conveyor C2 in the manufacturing apparatus 11 of the glass forming body GC are arranged in parallel up and down, the 1st conveyor C1 and the 2nd conveyor C2 can also be arranged in parallel in right and left. . In this case, the first transfer mechanism 24 and the second transfer mechanism 25 in the glass molded body GC manufacturing apparatus 11 may be changed to transfer mechanisms that transfer the molding member 12 in the left-right direction.

  -You may change the 1st automatic conveyance line L1 and the 2nd automatic conveyance line L2 in the manufacturing apparatus 11 of the glass forming body GC into the loop conveyor which comprises a loop-shaped conveyance path | route. In this case, while using a part of conveyance path comprised with a loop conveyor as the 1st automatic conveyance line L1 which performs shaping | molding process S1, 2nd automatic conveyance line L2 which performs the return process S2 while using the other part of the said conveyance path | route. Can be used as

  As shown in FIG. 6, in the manufacturing apparatus 11 of the glass molded body GC, the cutting device 23 may be omitted, and the long glass may be changed to the extraction portion 15 that takes out the glass molded body GC. In this case, the take-out portion 15 is provided with a support member 15a for supporting the long glass molded body GC in a state of being separated from the molding member 12.

  As shown in FIG. 7, in the glass molded body GC manufacturing apparatus 11, an extraction portion 15 for taking out the glass molded body GC may be provided on the second placement portion 25 a of the second transfer mechanism 25. That is, in the manufacturing apparatus 11 for the glass molded body GC, the first automatic conveyance line L1 for performing the molding step S1 is configured by the first conveyor C1, the second conveyor C2, the first transfer mechanism 24, and the second transfer mechanism 25. And you may comprise the 2nd automatic conveyance line L2 which performs return process S2 from the 2nd mounting part 25a of the 2nd transfer mechanism 25. FIG. Thus, the position of the take-out portion 15 for taking out the glass molded body GC 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. .

  As shown in FIG. 8, the outer shape of the molding member 12 is not limited to a square shape. For example, the upstream end 12a of the molding member 12 is changed to a convex shape, and the downstream end 12b of the molding member 12 is a concave shape. It can also be changed.

  -Even if it is a case where the member 12 for shaping | molding is changed into the structure provided with the flat-plate-shaped main-body part and the standing wall erected on the side edge part, the upper surface of the member group 16 for shaping | molding is 1st conveyance It can also be formed in a continuous plane continuous along the direction MD1. Moreover, even if it is a case where the member 12 for shaping | molding is changed into the structure provided with the flat main body part and the leg part which supports a main body part, the upper surface of the member group 16 for shaping | molding is set to 1st conveyance direction MD1. It can also be formed in a continuous plane that is continuous along.

  The molding member 12 may include a flat plate-like main body portion and an annular standing wall that stands on the peripheral edge 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 discontinuous plane along the first transport direction MD1.

  -As shown in FIG. 9, the 1st automatic conveyance line L1 in the manufacturing apparatus 11 of the glass forming body GC is not limited to the structure which conveys the member group 16 for shaping | molding, The some shaping | molding spaced apart in 1st conveyance direction MD1. The structure which conveys the member 12 for work may be sufficient. In this case, the nozzle 14 may be configured not to continuously flow down the molten glass MG, but to intermittently flow down the molten glass MG in synchronization with the molding member 12 being conveyed.

-You may abbreviate | omit the 2nd automatic conveyance line L2 in the manufacturing apparatus 11 of the glass molded object GC.
-The inclination angle changing mechanism 20 in the manufacturing apparatus 11 of the glass molded body GC is omitted, for example, by arranging a spacer between the base of the first conveyor C1 and the installation surface on which the base is installed, the inclination The angle θ may be set.

  -For example, the molding member 12 may be changed so as to be transported horizontally without tilting the first automatic transport line L1 in the manufacturing apparatus 11 for the glass molded body GC, or the downstream end of the molding member 12 You may incline the 1st automatic conveyance line L1 so that 12b may become upper.

  -The 1st conveyor C1 and the 2nd conveyor C2 in the manufacturing apparatus 11 of the glass forming body GC are not limited to a roller conveyor, It can also change into the belt conveyor provided with the endless belt. That is, the molding member 12 may be placed on the belt of the belt conveyor and conveyed.

  As shown in FIG. 10, the glass molded body GC manufacturing apparatus 11 uses the belt 26 a of the belt conveyor 26 as the molding moving body to flow down the molten glass MG without using the molding member 12, and causes the glass molded body GC to flow down. You may change to the apparatus which manufactures. The conveyor belt 26a may be, for example, a flat belt having no holes, or a belt having holes such as a mesh belt. Moreover, you may employ | adopt the structure which connected the some plate as the belt 26a (moving body for a shaping | molding) of a conveyor.

  DESCRIPTION OF SYMBOLS 11 ... Manufacturing apparatus of a glass forming body, 12 ... Forming member (moving body for forming), 13 ... Preheating part, 17b ... Induction coil, 21 ... Rolling roller, 26 ... Belt (moving body for forming), MG ... Melting Glass, G ... glass, GC ... glass molding.

Claims (7)

A method for producing a glass molded body for producing a glass molded body by causing molten glass to flow down on a movable body for molding,
A method for producing a glass molded body, comprising: a preheating step of electromagnetically heating the molding moving body before the molten glass comes into contact with the molding moving body.   The method for producing a glass molded body according to claim 1, wherein the electromagnetic heating is induction heating.   The method for producing a glass molded body according to claim 2, wherein the molding moving body is induction-heated by passing through the inside of an induction coil while being conveyed by a conveyor. The molding moving body is a plate-shaped member made of a material containing 90 mass% or more of iron and having a thickness of 5 mm or more,
The method for producing a glass molded body according to claim 2 or 3, wherein the electromagnetic heating is induction heating using a high frequency of 50 Hz or more and 400 Hz or less. The molten glass has a thermal expansion coefficient of 100 × 10 ⁻⁷ / ° C. or higher at 30 to 300 ° C., and uses a molten glass having a composition in which a glass molded body containing P ₂ O ₅ is molded. The manufacturing method of the glass molded object as described in any one of Claim 1 to 4.   6. The method according to claim 1, further comprising a rolling step of rolling at least one of the molten glass before contacting the molding moving body and the glass on the molding moving body with a rolling roller. A method for producing a glass molded body according to claim 1. A glass molded body manufacturing apparatus for manufacturing a glass molded body by causing molten glass to flow down on a movable body for molding,
An apparatus for producing a glass molded body, comprising: a preheating unit that electromagnetically heats the molding moving body before the molten glass contacts the molding moving body.