WO2014129591A1

WO2014129591A1 - Device for manufacturing molded glass body and method for manufacturing molded glass body

Info

Publication number: WO2014129591A1
Application number: PCT/JP2014/054200
Authority: WO
Inventors: 尚之繁野; 藤本　忠幸
Original assignee: Hoya株式会社
Priority date: 2013-02-21
Filing date: 2014-02-21
Publication date: 2014-08-28
Also published as: JP2014162650A; CN104718165B; CN104718165A; JP5994676B2

Abstract

A device for manufacturing a molded glass body in which a plurality of support members, on which a plurality of molds are placed, are circulated through processing chambers and processed, wherein variation in mold temperature between the support members is reduced. The device (1) for manufacturing a molded glass body is provided with: a plurality of shielding mechanisms (62) provided to a heating unit (first and second heating chambers (20, 22)) or a soaking chamber (24), the shielding mechanisms (62) being capable of moving so as to shield a plurality of molding dies (52) respectively from a heater (32); and a control unit (70) for controlling each shielding time in which each of the shielding mechanisms (62) shields the corresponding molding die (52). The control unit (70) controls the shielding time for each respective shielding mechanism (62) so that the temperature of the molding dies (52) in each of the mold units (8) is essentially uniform.

Description

Glass molded body manufacturing apparatus and glass molded body manufacturing method

TECHNICAL FIELD The present invention relates to a glass molded body manufacturing apparatus and a glass molded body manufacturing method, and in particular, glass molding in which a plurality of support members on which a plurality of molds are placed are circulated through each processing chamber. The present invention relates to an apparatus for manufacturing a body and a method for manufacturing a glass molded body using the apparatus.

Conventionally, in each processing unit, a plurality of support members on which a plurality of molds are placed are sequentially circulated through a heating unit, a press unit, and a slow cooling unit provided along the circumference by a rotary table. 2. Description of the Related Art An apparatus for forming glass by performing each process of heating, pressing, and cooling (including slow cooling) is widely used. In such an apparatus, the plurality of molds placed on the support member have a temperature caused by a difference in the amount of heat received from the heating means depending on a position arranged on the support member, a difference in temperature between adjacent chambers, or the like. Variation will occur.

Therefore, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-56532), a heating unit is provided with a shielding unit that shields thermal energy from the heating unit, and further, thermal energy irradiated to a plurality of molds on the support member. Depending on the size, thickness, material, and fixing position of the shielding means, the shielding means corresponding to the mold that tends to become high temperature increases the shielding effect, and the shielding means corresponding to the mold that tends to become low temperature Describes reducing the variation in temperature between molds by lowering the shielding effect.

JP 2008-56532 A

Here, in the apparatus as described above, the cause of the variation in the temperature between the molds is the variation in the temperature of the mold in each support member due to the arrangement of the heaters and the temperature difference between the adjacent processing chambers (hereinafter referred to as the following). , “Variation between lines”) and mold temperature variation (hereinafter referred to as “unit variation”) for each mold unit due to a shape error of a support member constituting the mold unit. However, in the apparatus described in Patent Document 1, although the variation between lines can be suppressed, the variation between units cannot be suppressed. For this reason, there was still a problem that the temperature of the mold varied. If the mold temperature varies in this way, the glass material may not be sufficiently softened during pressing, or foaming may occur from the glass material, causing defective molding.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a glass molded body manufacturing apparatus that performs processing by circulating a plurality of support members on which a plurality of molds are placed through each processing chamber. Is to reduce the temperature variation of the mold, especially the temperature variation between the units.

The glass molded body manufacturing apparatus of the present invention sequentially includes a plurality of mold units including a support member, and a plurality of molds that are juxtaposed along the conveyance path of the support member and that contain a glass material therein. A transport mechanism that transports, a heating unit that heat-treats the glass material provided along the transport path, a soaking unit that soaks the glass material, a press unit that presses the glass material to form a molded body, And a glass molded body manufacturing apparatus comprising: a plurality of processing units including a slow cooling unit that performs a slow cooling process on the molded body; and a heater provided along a conveyance path of the plurality of processing units. The molded body manufacturing apparatus further includes a plurality of shielding mechanisms that are provided in the heating unit or the soaking unit, and that are movable so that the plurality of molds can be shielded from the heaters, respectively, and a plurality of shielding mechanisms Shield the corresponding mold by And a control unit for controlling 蔽時 between each, the, control unit, temperature of each mold of a plurality of mold units so as to be substantially uniform, controlled blocking times of a plurality of shielding mechanisms, respectively.
In the present specification, “the temperature is substantially uniform” means that the maximum temperature difference in the line-to-line variation and the unit-to-unit variation is 10 degrees or less.

In addition, the method for producing a glass molded body of the present invention sequentially includes a plurality of mold units including a support member and a plurality of molds that are juxtaposed along the conveyance path of the support member and that contain a glass material therein. , A transport mechanism for transporting, a heating unit that heat-treats the glass material provided along the transport path, a soaking unit that soaks the glass material, and a press unit that presses the glass material to form a molded body And a plurality of processing units including a slow cooling unit that performs a slow cooling process on the molded body, a heater provided along a conveyance path of the plurality of processing units, and the heating unit or the soaking unit, and And a plurality of shielding mechanisms movable so that the plurality of molds can be shielded from the heaters, respectively, and a control unit for controlling the shielding time for shielding the corresponding molds by the plurality of shielding mechanisms. Glass body manufacturing equipment The glass molded body is manufactured by the heating step of heating the glass material in the heating unit, the soaking step of soaking the glass material in the soaking unit, and the pressing unit. In the heating step or soaking step, each mold of the plurality of mold units is provided with a pressing step for pressing the glass material into a molded body and a cooling step for cooling the molded body in the slow cooling section. The shielding times of the plurality of shielding mechanisms are controlled so that the mold temperature is substantially uniform.

According to the present invention, a shielding mechanism is provided for each of the plurality of molds placed on the support member of the mold unit, and the shielding time by these shielding mechanisms is set for each mold of the plurality of mold units. Since each control is performed, it is possible to reduce the mold temperature variation, in particular, the unit-to-unit variation.

According to the present invention, in a glass molded body manufacturing apparatus that processes a plurality of support members on which a plurality of molds are placed by circulating through each processing chamber, variation in mold temperature between units is reduced. Accordingly, a homogeneous glass molded body can be stably produced.

It is a horizontal sectional view which shows the structure of the manufacturing apparatus of the glass forming body used by this embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG. 6 is a time chart showing the timing of shielding from the heater by each shielding mechanism for the A to D line molds in the first mold unit. 10 is a time chart showing the timing of shielding from heaters by respective shielding mechanisms for A to D line molds in a second mold unit. 6 is a graph showing the temperature history of the tips of the supporting parts of the A to D lines measured by the temperature sensor when the glass forming body is manufactured by driving the manufacturing apparatus in a state where the shielding mechanism is driven. 6 is a graph showing the temperature history of the tip of the support part of the A to D lines measured by the temperature sensor when the glass forming body is manufactured by driving the manufacturing apparatus with the shielding mechanism stopped. Supporting the A to D lines of the first to eighth mold units measured by the temperature sensor in the soaking chamber when the manufacturing apparatus is driven with the shielding mechanism driven to manufacture the glass molded body. It is a graph which shows the temperature of the front-end | tip of a part. When the glass forming body is manufactured by driving the manufacturing apparatus in a state where the shielding mechanism is stopped, the A to D lines of the first to eighth mold units measured by the temperature sensor in the soaking chamber are used. It is a graph which shows the temperature of the front-end | tip of a support part. It is a horizontal sectional view which shows the structure of the manufacturing apparatus of the glass molded object which is one Embodiment of this invention.

Hereinafter, an embodiment of a manufacturing apparatus and a manufacturing method of a glass molded body of the present invention will be described in detail with reference to the drawings. In addition, in each embodiment, about the site | part which has a common structure and function, the same code | symbol is attached | subjected and description is abbreviate | omitted.
FIG. 1 is a horizontal sectional view showing a configuration of a glass molded body manufacturing apparatus used in this embodiment, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. It is. As shown in FIG. 1, the glass molded body manufacturing apparatus 1 of the present embodiment includes an apparatus housing 2 formed in a bottomed cylindrical shape, a rotary table 4 provided in the apparatus housing 2, and a rotary table. 4 and an inner casing 6 having an arcuate horizontal cross section provided above 4. The device casing 2, the inner casing 6, and the turntable 4 are arranged concentrically.

The device casing 2 has a substantially circular top cover and a bottom plate (not shown) attached to the top and bottom, and the inside is in a sealed state. The internal space of the apparatus housing 2 is an inert gas atmosphere. As the inert gas, nitrogen, argon, or the like is used, and the oxygen concentration is preferably 5 ppm or less. It should be noted that the oxidation of the mold unit 8 and the surface alteration of the glass material can be prevented by making the internal space an inert gas atmosphere in this way.

The upper lid is formed with a loading / unloading port (not shown) through which the mold can be fed into the apparatus and carried out of the apparatus, and a loading / unloading section 46 is formed in the apparatus below. Has been. In the present embodiment, the carry-in / carry-out unit 46 is shown as an example having both the supply unit and the carry-out unit in the present invention. However, the carry-in unit (supply unit) and the carry-out unit (carry-out port) are provided separately. May be.

The turntable 4 includes a turntable 10, a drive shaft (not shown) connected to the center of the turntable 10, and a drive mechanism (not shown) such as a motor that rotates the drive shaft. . On the turntable 10, a number of mold units 8 (eight in the present embodiment) corresponding to the number of processing chambers are arranged at equal intervals. As will be described later, the mold unit 8 includes a support base (support member) 12 and a plurality of (four in this embodiment) molds 52 placed on the support base 12.

The mold unit 8 disposed on the turntable 10 is intermittently transferred to each processing chamber in the inner casing 6 as the turntable 10 rotates. In the present embodiment, the rotary table 4 conveys the mold unit 8 along the circumference of a predetermined radius by intermittently rotating the drive mechanism by 45 degrees every predetermined time. The path along which the mold unit 8 is transported corresponds to the transport path of the present invention. Further, the rotary table 4 stops for a predetermined stop time set in advance during each rotation operation. The stop time of the rotary table 4 is determined to be longer than the time required for the press process in the press chamber 26 described later.

The inner casing 6 is concentrically coaxial with the apparatus housing 2 and has an inner wall 6A extending in an arc shape over an angular range of 270 degrees in the horizontal direction, and is located radially outside the inner wall 6A and is circular over an angular range of 270 degrees in the horizontal direction. It has an outer wall 6B that extends in an arc shape, a ceiling that closes between the inner wall 6A and the upper part of the outer wall 6B, and a bottom that closes between the inner wall 6A and the lower part of the outer wall 6B. The inner wall 6A, the outer wall 6B, the ceiling portion 6C, and the bottom portion 6D form a processing space having an arc-shaped horizontal cross section in the inner casing 6. An arc-shaped slit 6E is formed in the bottom 6D of the inner casing 6 along the conveyance path of the mold unit 8.

The processing space of the inner casing 6 is divided into six chambers within an angle range of 45 degrees in the rotation direction of the turntable 4. These six chambers are arranged along the conveyance path of the mold unit 8 in the first heating chamber 20, the second heating chamber 22, the soaking chamber 24, the press chamber 26, the first annealing chamber 28, and the second annealing chamber. They are arranged in the order of 30. The first heating chamber 20 and the second heating chamber 22 in the present embodiment correspond to the heating section of the present invention, the soaking chamber 24 of the present embodiment corresponds to the soaking section of the present invention, and the press chamber of the present embodiment. 26 corresponds to the press section of the present invention, and the first slow cooling chamber 28 and the second slow cooling chamber 30 of the present embodiment correspond to the cooling section of the present invention.

The heating unit is a processing unit for rapidly heating the mold 52 and the glass material 60 of the mold unit 8 having a temperature close to normal temperature to a temperature suitable for press molding. In the present embodiment, two heating chambers of the first heating chamber 20 and the second heating chamber 22 are provided as the heating unit, and the temperature of the mold unit 8 is raised stepwise, but depending on the processing time and the target temperature The number of rooms may be increased or decreased.

The soaking part is a processing part for heating the mold unit 8 at a substantially constant temperature so as to soak the mold 52 and the glass material 60 to a temperature suitable for press molding. The temperature suitable for press molding varies depending on the glass glass type and the shape and volume of the molded body, but is generally a temperature at which the glass material has a viscosity of 10 ⁶ to 10 ¹¹ dPa · s, and the glass yield point temperature [Ts It is preferably in the vicinity.

The press unit is a processing unit that applies a load to the mold 52 to deform the glass material that has been heated and softened to a predetermined temperature and transfer the shape of the molding surface of the mold to form a glass molded body. is there. You may provide a press part in multiple places like embodiment shown in FIG. 10 mentioned later.

The cooling unit is a processing unit including a slow cooling unit that slowly cools the glass molded body formed in the press unit at a predetermined cooling rate. In the present embodiment, the two slow cooling chambers of the first slow cooling chamber 28 and the second slow cooling chamber 30 are provided as the cooling unit, and the mold unit 8 is gradually cooled. The number may be increased or decreased.

Between the circumferential end of the inner casing 6 and each chamber, a shutter (not shown) for separating adjacent processing chambers is provided.

Heaters

32, 34, respectively, are provided on both sides of the transport path of the first heating chamber 20, the second heating chamber 22, the soaking chamber 24, the press chamber 26, the first annealing chamber 28, and the second annealing chamber 30, respectively. 36, 38, 40, and 42 are provided. These

heaters

32, 34, 36, 38, 40, 42 are respectively a first heating chamber 20, a second heating chamber 22, a soaking chamber 24, a press chamber 26, a first annealing chamber 28, and a second annealing chamber. The inside 30 is heated to a predetermined temperature.

Further, as shown only in FIG. 3, the soaking chamber 24 is provided with a reflector 36A along the inner wall 6A and the outer wall 6B. The reflector 36A reflects the heat energy radiated from the heater 32 and prevents heat from being released to the outside of the heater. Thereby, heat energy can be intensively guided to the mold and the mold can be efficiently heated. The reflector 36A includes a first heating chamber 20, a second heating chamber 22, a soaking chamber 24, a press chamber 26, and a first slow cooling chamber 28 in which

heaters

32, 34, 36, 38, 40, and 42 are provided. The second slow cooling chamber 30 is installed.

Further, as shown in FIGS. 2 and 3, the soaking chamber 24 is provided with a plurality of shielding mechanisms 62. Each shielding mechanism 62 includes a shielding part 64 having a U-shaped vertical cross-section, a shaft part 66 connected to the upper part of the shielding part 64 and extending in the vertical direction, and a lifting mechanism 68 for moving the shaft part 66 up and down. The The shielding part 64 is made of a metal or ceramic having high heat resistance such as a nickel alloy or a tungsten alloy. The same number of shielding mechanisms 62 as the mold units 8 are provided for each mold 52 of the mold unit 8. Moreover, the raising / lowering mechanism 68 of each shielding mechanism 62 has drive mechanisms, such as a motor and a hydraulic cylinder, and is connected to the control part 70 so that communication is possible. The control unit 70 can control the elevating mechanism 68 to lower and raise the shielding unit 64 at a desired timing.

A press mechanism (not shown) is provided on the upper lid above the press chamber 26. The press mechanism is provided with a drive mechanism such as a motor or a hydraulic cylinder provided corresponding to each of the plurality of molds placed on the support base 12, and by driving this drive mechanism, one end of the drive mechanism is provided. The attached press head presses each mold 52 of the mold unit 8 in the press chamber 26 from above, and presses the glass material. In addition, it is desirable to provide a pressure receiving member that supports the turntable 10 or the support base 12 from below when the press mechanism presses the forming die at a position corresponding to the lower side of the press mechanism of the rotary table 4.

As shown in FIG. 1, a quenching section 44 and a carry-in / carry-out section 46 are formed between the second slow cooling chamber 30 and the first heating chamber 20 in the transport path in the apparatus housing 2. The rapid cooling section 44 is an area for rapidly cooling the mold unit 8, and no heater is disposed around it. Further, the carry-in / carry-out unit 46 exchanges, through the carry-in / carry-out port, a mold containing a glass molded body that has been molded and a mold containing a new glass material that has not been subjected to a molding process. It is an area for. The carry-in / carry-out unit 46 is provided with a carry-in / carry-out mechanism that can move the mold unit 8 up and down. The molding die 52 that has been molded can be taken out and a new molding die 52 can be placed on the support base 12. This carry-in / carry-out mechanism corresponds to the supply mechanism and the carry-out mechanism of the present invention.

2 and 3, the mold unit 8 includes a support base 12 and a plurality of (four in this embodiment) forming dies 52 placed on the support base 12. As the material of the mold 52, silicon carbide, cemented carbide, silicon nitride, or the like is used. The support base 12 includes a base portion 12A and a plurality of (four in this embodiment) columnar support portions 12B provided upright on the base portion 12A. A temperature sensor 13 capable of detecting the temperature of the tip of each support 12B is embedded in the tip of each support 12B. The temperature sensor 13 is communicably connected to the control unit 70, and the temperature measured by the temperature sensor 13 of each support unit 12 </ b> B is transmitted to the control unit 70. 2 and 3, when the molding die 52 is placed on the support base 12, the temperature at the tip of each support portion 12B is substantially equal to the temperature at the bottom of the molding die 52, and the temperature sensor The temperature measured by 13 can be regarded as the temperature of the mold 52.

Each mold 52 is placed on each support portion 12B of the support base 12. The molding die 52 has an upper die 54 and a lower die 56 having molding surfaces formed in accordance with the shape of the glass molded body to be manufactured, and a cylinder that regulates the mutual position of the upper die 54 and the lower die 56 in the radial direction. And a mold 58. A release film is formed on the molding surfaces of the upper mold 54 and the lower mold 56. The glass material 60 is disposed in a state of being sandwiched between the upper mold 54 and the lower mold 56. In a state where the glass material 60 is heated to the glass yield point temperature or higher, by pressing the upper and lower molds 54 and 56 in a relatively close direction, the shape of the molding surface is transferred to the glass material, and a glass molded body having a desired shape (Optical element) can be press-molded.

Before starting the molding of the lens, the controller 70 drives the manufacturing apparatus 1 by placing the molding die 52 on the support base 12 in a state where the shielding mechanism 62 is stopped in advance. 13, the temperature history at the tip of each support portion 12B of each mold unit 8 measured by 13 is recorded. As will be described later, the controller 70 substantially determines the temperature of each mold of each mold unit 8 based on the recorded temperature history at the tip of each support section 12B of each mold unit 8. The timing at which the elevating mechanism 68 lowers and raises the shielding part 64 is controlled so as to be uniform.

Hereinafter, a method of manufacturing a glass molded body by the glass molded body manufacturing apparatus 1 of the present embodiment will be described. In the following description, a method of manufacturing a glass molded body will be described by paying attention to one mold unit 8, but in the glass molded body manufacturing apparatus 1 of the present embodiment, depending on the number of processing chambers. A plurality of mold units 8 are arranged on the turntable 10 of the turntable 4 in an equiangular range of 45 degrees. The plurality of mold units 8 are continuously transported along the transport path by the rotary table 4, and processes such as heat treatment, press processing, and slow cooling processing are performed in parallel in each processing chamber.

First, when the rotary table 4 rotates and the mold unit 8 that accommodates the glass molded body for which the molding process has been completed reaches the carry-in / carry-out unit 46, the mold unit 8 is lifted by the carry-in / carry-out mechanism, From the outlet, the four molding dies 52 that have been processed are simultaneously carried out of the apparatus housing 2. Then, these molds 52 are held by a robot hand (not shown) and removed from the support portion 12B of the support base 12. Thereafter, the molds 52 loaded with the new glass material 60 are placed on the support portion 12B of the support base 12 respectively.

When a preset stop time (hereinafter referred to as a tact time) of the rotary table 4 has elapsed since the completion of the previous rotation operation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened. Thus, the rotary table 4 rotates 45 degrees counterclockwise in plan view. As a result, the mold 52 is conveyed into the first heating chamber 20 while being held by the support 12. At this time, since the support portion 12B of the support base 12 passes through the slit 6E provided at the bottom of the inner casing 6, the support portion 12B and the inner casing 6 do not interfere with each other.

When the mold unit 8 is conveyed to the first heating chamber 20, a first heating step for heating the mold unit 8 is performed. The inside of the first heating chamber 20 is maintained at a temperature equal to or higher than the glass yield point temperature (Ts) by the heaters 32 provided on both sides of the transport path. Then, the mold unit 8 conveyed to the first heating chamber 20 is heated by the heater 32.

When a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is turned counterclockwise in plan view. Rotate 45 degrees. Thereby, the mold unit 8 is conveyed into the second heating chamber 22.

When the mold unit 8 is conveyed to the second heating chamber 22, a second heating step is performed in which the mold 52 of the mold unit 8 is heated to about the glass yield point temperature. The inside of the second heating chamber 22 is maintained at a temperature equal to or higher than the glass yield point temperature by the heater 34. Thereby, it heats until the glass material 60 in the metal mold unit 8 conveyed in the 2nd heating chamber 22 reaches about a glass yield point temperature.

When a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is turned counterclockwise in plan view. Rotate 45 degrees. As a result, the mold unit 8 is transferred into the soaking chamber 24.

When the molding die 52 is conveyed to the soaking chamber 24, a soaking step for soaking the molding material 52 and the glass material 60 accommodated therein is performed. The inside of the soaking chamber 24 is maintained at the glass yield point temperature by the heater 36.

In the present embodiment, in the soaking step, in order to reduce the line-to-line variation and the unit-to-unit variation in the temperature of the mold 52, each of the mold units 8 positioned in the soaking chamber 24 by the shielding portion 64 of the shielding mechanism 62. The mold 52 is shielded from the heater 36, and the control unit 70 controls the shielding time of the plurality of shielding mechanisms 62 so that the temperatures of the plurality of molds 52 of each mold unit 8 become substantially uniform. To do. Specifically, the temperature at the time of unloading from the soaking chamber 24 in the temperature history of the tip of each support portion 12B of each mold unit 8 recorded in the control unit 70 is relative to the optimum temperature in the press process. If it is very high, the shielding time by the shielding mechanism 62 is set to a long time, and if it is slightly higher than the optimum temperature in the press process, the shielding time by the shielding mechanism 62 is set to a short time.

Hereinafter, as an example, a method for controlling the shielding time by the shielding mechanism 62 will be described so that the temperatures of the plurality of molds 52 of each mold unit 8 become substantially uniform. In the following description, the plurality of support portions 12B of the support base 12 in each mold unit 8 are referred to as an A line, a B line, a C line, and a D line, respectively, from the front side to the rear side in the traveling direction of the transport path. And In addition, the mold unit 8 is referred to as a first mold unit, a second mold unit,... In the order of transport to each processing unit.

FIG. 4 is a time chart showing the timing of shielding from the heater 36 by the shielding mechanisms 62 with respect to the A to D line forming dies 52 in the first mold unit. FIG. 5 is a time chart showing the timing of shielding from the heater 36 by the shielding mechanisms 62 with respect to the A to D line forming dies 52 in the second mold unit. The timing at which the mold 52 is shielded from the heater 36 by each of the shielding mechanisms 62 is determined based on the temperature history at the tip of each support portion 12B of each mold unit 8 recorded in the control unit 70.

When the four molds 52 are attached to the support base 12 as in the present embodiment, the mold 52 and the support portion 12B positioned at the center in the traveling direction of the transport path are the front side in the traveling direction and Compared with the mold 52 and the support part 12B positioned at the rear end, the heater 36 receives a large amount of radiant heat and also receives the heat of the adjacent mold 52 and the support part 12B, so that the temperature is likely to rise. For this reason, the temperature history recorded in the control unit 70 tends to be higher in the B and C lines than in the A and D lines in common with each mold unit.

Furthermore, when the soaking chamber 24 is provided between the second heating chamber 22 and the press chamber 26 as in the present embodiment, the press chamber 26 has a higher temperature than the second heating chamber 22. It is kept in. For this reason, the temperature history recorded in the control unit 70 tends to be higher in the A line than in the D line in common with each mold unit.

Therefore, the temperature at the time of carrying out from the soaking | uniform-heating chamber 24 recorded on the control part 70 is also the temperature of the shaping | molding die 52 of the B and C line, and the temperature of the support part 12B highest, and then the molding die 52 of A line In many cases, the temperature of the support portion 12B is high, and the temperatures of the D-line mold 52 and the support portion 12B are the lowest.

For this reason, in the present embodiment, the shielding time of the A to D lines is determined according to the difference between the temperature at the time of carrying out from the soaking chamber 24 in the temperature history of each line and the optimum temperature in the press process. As shown in FIG. 4, in the first mold unit 8, in the B and C lines having the highest temperature, from 5 seconds to 40 seconds after the mold unit 8 is transferred to the soaking chamber 24, that is, The mold 52 is shielded by the shielding mechanism 62 for 35 seconds. Further, in the A line having the next highest temperature, the mold 52 is shielded by the shielding mechanism 62 from 5 seconds to 20 seconds after the mold unit 8 is transferred to the soaking chamber 24, that is, for 15 seconds. In the D line having the lowest temperature, the mold 52 is shielded by the shielding mechanism 62 from 5 seconds to 15 seconds after the mold unit 8 is transferred to the soaking chamber 24, that is, for 10 seconds. . Thereby, the line-to-line variation of each mold 52 in the mold unit 8 when being conveyed to the press chamber 26 is reduced.

Furthermore, due to manufacturing errors of the support base, the temperature at the time of carrying out from the soaking chamber 24 may vary among the mold units. In this embodiment, it is assumed that the temperature at the time of carrying out from the soaking chamber 24 of the B line of the second mold unit is higher than the temperature of the B line of the first mold unit. In such a case, the shielding time by the shielding mechanism 62 for the B line of the second mold unit is made longer than the shielding time for the B line of the first mold unit. That is, as shown in FIG. 5, in the B line, the mold 52 is moved by the shielding mechanism 62 from 5 seconds to 45 seconds after the mold unit 8 is transferred to the soaking chamber 24, that is, for 40 seconds. Shield. Thereby, the unit-to-unit variation of the respective molds 52 in the first and second mold units 8 when being conveyed to the press chamber 26 is reduced.

In this way, the control unit 70 sets an appropriate shielding time by the shielding mechanism 62 for each mold 52 of the first to eighth mold units 8, and based on this, the control unit 70 The timing which raises / lowers the shielding part 64 of the shielding mechanism 62 is controlled. Thereby, each mold 52 is soaked in the soaking chamber 24 at a substantially uniform temperature.

As described above, “the temperature is substantially uniform” in this specification means that the maximum temperature difference in the line-to-line variation and the unit-to-unit variation is 10 degrees or less. Even if the line-to-line variation is suppressed to 10 ° C. or less, if the temperature variation between the units exceeds 10 ° C., a difference of 10 to 10 ² dPa · s is caused in the viscosity of the glass material. When such a viscosity difference occurs, the thickness of the press-molded product may not be uniform, or molding defects such as foaming, cracks, cracks, and transfer defects may occur. According to this embodiment, the maximum temperature difference in the line-to-line variation and the unit-to-unit variation can be suppressed to 10 ° C. or less and to 5 ° C. or less if strictly controlled. Obtainable.

When a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is turned counterclockwise in plan view. Rotate 45 degrees. Thereby, the mold unit 8 is conveyed into the press chamber 26.

When the mold unit 8 is conveyed to the press chamber 26, a press step is performed. In the press step, the mold unit 8 of the mold unit 8 is pressed by the press mechanism while the mold unit 8 is heated by the heater 38 so as to keep the glass yield point temperature, and the glass material is press-molded. The press load is preferably set as appropriate within a range of 10 to 1000 kgf / cm ² .

When the press step is completed and the tact time has elapsed from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is viewed in plan view. Rotate 45 degrees counterclockwise. Thereby, the mold 52 of the mold unit 8 is conveyed into the first slow cooling chamber 28.

In the first slow cooling chamber 28, a first slow cooling step for slowly cooling the mold 52 is performed while adjusting the temperature of the mold 52 with the heater 40. It is preferable to appropriately set the cooling rate for the time in the range of 10 to 100 ° C./min.

When the first slow cooling step is completed and a preset tact time has elapsed since the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the rotary table 4 rotates 45 degrees counterclockwise in plan view. Thereby, the mold 52 of the mold unit 8 is conveyed into the second slow cooling chamber 30.

In the second slow cooling chamber 30, a second slow cooling step for slowly cooling the mold 52 is performed while adjusting the temperature of the mold 52 by the heater 42. It is preferable to appropriately set the cooling rate for the time in the range of 10 to 100 ° C./min.

When the tact time elapses from the previous rotation of the rotary table 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the rotary table 4 rotates 45 degrees counterclockwise in plan view. . Thereby, the mold 52 of the mold unit 8 is conveyed from the second slow cooling chamber 30 to the rapid cooling unit 44.

When the mold 52 is conveyed to the rapid cooling section 44, a rapid cooling step is performed. The quenching section 44 is not provided with a heater and has a temperature similar to that around the apparatus. For this reason, the glass molded body inside the mold unit 8 and the molded body 52 is rapidly cooled. The cooling rate at this time is faster than the cooling rate in the slow cooling step, and is preferably set appropriately within a range of, for example, 30 to 300 ° C./min. Moreover, you may spray cooling gas toward the die unit 8 as needed.

Further, when a preset tact time elapses from the previous rotation of the rotary table 4, the rotary table 4 rotates 45 degrees and the mold unit 8 is transferred to the loading / unloading unit 46.
When the mold unit 8 that accommodates the glass molded body that has undergone the molding process reaches the carry-in / carry-out unit 46, the mold unit 8 is raised by the lifting mechanism, and the mold 52 that has undergone the molding process from the carry-in / carry-out port Are simultaneously carried out of the apparatus housing 2.
Through the above steps, the glass molded body can be continuously produced by the production apparatus 1.

In the above embodiment, the shielding mechanism 62 is provided only in the soaking chamber 24. However, the present invention is not limited to this, and the first heating chamber 20, the second heating chamber 22, the first slow cooling chamber 28, and the second A shielding mechanism 62 may be provided in the slow cooling chamber 30, and the shielding time by the shielding mechanism 62 may be controlled similarly to the soaking chamber 24. In this case, the shielding time of the shielding mechanism in each chamber may be set based on the temperature immediately before being taken out from each chamber in the temperature history recorded in the control unit 70.

Further, the shielding mechanism 62 may be provided only in the heating unit. Since the heating unit is in the initial stage of heating the mold unit 8, it is possible to equalize the mold unit 8 from the initial stage of heating. When a plurality of heating chambers (first heating chamber 20 and second heating chamber 22) are provided as in the present embodiment, the shielding mechanism 62 may be provided in any one heating chamber. However, it may be provided in a plurality of heating chambers.

The inventors have confirmed through experiments that according to the manufacturing apparatus of the present invention, it is possible to reduce the line-to-line variation of the mold temperature and the unit-to-unit variation. Hereinafter, this experiment will be described.

In this experiment, with the shielding mechanism 62 driven and the shielding mechanism 62 stopped, the manufacturing apparatus 1 is driven to manufacture a glass molded body, and the temperature history of each line A to D of each mold unit 8 is manufactured. Was measured. In this experiment, a shielding mechanism 62 is provided in the second heating chamber 22 in addition to the soaking chamber 24.

FIG. 6 shows a supporting portion 12B of A to D lines measured by a temperature sensor when the glass forming body is manufactured by driving the manufacturing apparatus 1 with the shielding mechanism 62 driven (hereinafter referred to as Example 1). It is a graph which shows the temperature history of the front-end | tip (equivalent to the temperature history of a shaping | molding die). FIG. 7 shows A to D lines measured by the temperature sensor when the manufacturing apparatus 1 is driven with the shielding mechanism 62 stopped to manufacture a glass molded body (hereinafter referred to as Comparative Example 1). It is a graph which shows the temperature history of the front-end | tip of the support part 12B. These temperature histories are average temperature histories of the first to eighth mold units.

As shown in FIG. 7, in Comparative Example 1, the temperature at the tip of the support portion 12B of the B and C lines is much higher than that of the A and D lines between the second heating step and the soaking step as described above. It is rising high. Further, the temperature at the tip of the support portion 12B of the A line is higher than that of the D line. The temperature difference between the highest temperature B line and the lowest temperature D line at the start of the soaking step is about 15 degrees. This temperature difference remains almost completely eliminated in the pressing process and the slow cooling process.

On the other hand, as shown in FIG. 6, in Example 1, the temperature of the A to D lines shows substantially the same temperature history even during the period from the second heating step to the soaking step. In addition, the temperature difference between the highest temperature B line and the lowest temperature D line at the start of the soaking step is about 5 degrees, which is very small compared to the comparative example. And this temperature difference does not become large in a press process and a slow cooling process.

FIG. 8 shows a case where a glass molded body is manufactured by driving the manufacturing apparatus 1 with the shielding mechanism 62 being driven (hereinafter referred to as Example 2), and was measured by a temperature sensor in a soaking chamber. It is a graph which shows the temperature of the front-end | tip of the support part 12B of the A-D line of a 1st-8th metal mold unit. FIG. 9 shows a case where a glass molded body is manufactured by driving the manufacturing apparatus 1 with the shielding mechanism 62 stopped (hereinafter referred to as Comparative Example 2), and is measured by a temperature sensor in a soaking chamber. 10 is a graph showing the temperature at the tip of the support portion 12B of the A to D lines of the first to eighth mold units. The numbers 1 to 8 on the horizontal axis in FIGS. 8 and 9 correspond to the first to eighth mold units, respectively.

As shown in FIG. 9, in Comparative Example 2, a large temperature variation occurs between the lines in each mold unit, and the temperature difference between the lines in the first to eighth mold units is almost 10 ° C. Over. Further, in Comparative Example 2, the temperature of each mold unit when being carried out of the soaking chamber also varies. The difference between the temperature of the B line of the fifth mold unit having the highest temperature and the temperature of the D line of the third mold unit having the lowest temperature is 15 ° C. or more.

On the other hand, as shown in FIG. 8, in Example 2, the temperature variation between the lines in each mold unit is much smaller than that in Comparative Example 2, and in the first to eighth mold units. The temperature difference between the lines is 5 ° C. or less. Moreover, in Example 2, the dispersion | variation in the temperature of each mold unit at the time of carrying out from a soaking | uniform-heating chamber is also very small.
As described above, according to the glass molded body manufacturing apparatus of the present embodiment, not only the temperature variation between lines in each mold unit but also the temperature variation between mold units can be reduced by the above experiment. confirmed.

As described above, according to the present embodiment, the shielding mechanism 62 is provided for each of the plurality of molds 52 placed on the support portion 12B of the mold unit 8, and the shielding mechanism 62 is provided by the control unit. In order to control the shielding time by the respective molds 52 of the respective mold units 8, it is possible to reduce the variation in the temperature of the molds 52, especially the unit-to-unit variation when being carried out of the soaking chamber 24. it can.

Furthermore, in the present embodiment, the mold 52 is placed on the support 12 with the shielding mechanism 62 stopped in advance, and the manufacturing apparatus 1 is driven. At this time, each of the measured mold units 8 is measured. The temperature history at the tip of the support portion 12B is recorded in the control unit 70. And the control part 70 controls the shielding time by the shielding mechanism 62 based on this temperature history. In this way, by controlling the shielding time by the shielding mechanism 62 based on the temperature history in the actually driven state, the temperature variation of each mold 52 can be further reduced.

And since the dispersion | variation in the temperature of each shaping | molding die 52 can be reduced in this way, the shaping | molding precision of a glass molded object can be improved.

In the present embodiment, the mold unit 8 is transported along the circular path by the rotary table 4, but the present invention is not limited to this, and the mold unit 8 may be transported by a transport means such as an arm. Further, the conveyance path is not limited to a circle, and may be a straight line.

Further, in the present embodiment, the control unit 70 controls the shielding time by the shielding mechanism 62 based on the temperature history at the tip of each support portion 12B of each mold unit 8 measured in advance. The present invention is not limited to this.

For example, the shielding time of the shielding mechanism 62 may be controlled in real time based on the temperature of each support portion 12B of each mold unit 8 measured by the temperature sensor 13. In such a case, for example, the control unit 70 calculates the time to be shielded by the shielding mechanism 62 based on the difference between the temperature measured by the temperature sensor 13 and the reference temperature. And the control part 70 shields the shaping | molding die 52 with the shielding mechanism 62 over the calculated shielding time. Even with such a configuration, the temperatures of the respective molds 52 of the respective mold units can be made substantially uniform.

In the present embodiment, the first heating chamber 20, the second heating chamber 22, the soaking chamber 24, the press chamber 26, the first annealing chamber 28, and the second annealing chamber 30 are formed in the inner casing 6. Although the manufacturing apparatus 1 has been described, the present invention can also be applied to a manufacturing apparatus having a plurality of press chambers.

FIG. 10 is a horizontal sectional view showing a configuration of a manufacturing apparatus 101 having two press chambers. As shown in FIG. 10, in the manufacturing apparatus 101 shown in FIG. 10, a heating chamber 120, a first soaking chamber 122, a first press chamber 124, a first annealing chamber 126, and a second soaking chamber are provided in the inner casing 6. A chamber 128, a second press chamber 130, and a second slow cooling chamber 132 are provided. The heating chamber 120, the first soaking chamber 122, the first press chamber 124, the first annealing chamber 126, the second soaking chamber 128, the second pressing chamber 130, and the second annealing chamber 132 are respectively

Heaters

134, 136, 138, 140, 142, 144, and 146 are provided.

In the manufacturing apparatus including two press chambers as described above, a shielding mechanism may be provided in each of the first and second soaking

chambers

122 and 128 as in the above embodiment.

In this case, similarly to the above-described embodiment, the mold 52 is placed on the support base with the shielding mechanism 62 stopped in advance, and the manufacturing apparatus 101 is driven. At this time, each measured mold unit is measured. The shielding time of the shielding mechanism 62 of each of the soaking

chambers

122 and 128 may be set based on the temperature history at the tip of each of the eight support portions 12B. Further, it is possible to set the shielding time of the shielding mechanism 62 of each soaking chamber as follows.

First, with the shielding mechanism 62 of the first and second soaking

chambers

122 and 128 stopped in advance, the mold 52 is placed on the support base 12 and the manufacturing apparatus 101 is driven. The temperature history at the tip of each support portion 12B is measured. Based on this temperature history, the shielding time of each shielding mechanism 62 of the first soaking chamber 122 is set so that the temperature immediately before being carried out of the first soaking chamber 122 becomes substantially uniform.

Next, the shielding mechanism 62 of the second soaking chamber 128 is stopped, and the manufacturing apparatus 101 is driven in a state where the shielding mechanism 62 of the first soaking chamber 122 is activated. The temperature history at the tip of 12B is measured. At this time, the shielding mechanism 62 of the first soaking chamber 122 is driven to shield the mold from the heater 136 for the set time.

Based on the temperature history thus measured, the shielding time of each shielding mechanism 62 of the second soaking chamber 128 is substantially uniform at the temperature immediately before being transported from the second soaking chamber 128. Set as follows.

In this way, by setting the shielding time of the shielding mechanism 62 of the first and second soaking

chambers

122 and 128, the temperature of the mold 52 carried into the first and

second press chambers

124 and 130 is further increased. It can be made uniform.

It goes without saying that the present invention is not limited to the embodiment described above and can be variously modified without departing from the present invention. For example, the shape of the shielding portion 64 in the present invention may be a U-shaped cross section or a bottomed cylindrical shape in addition to a U-shaped cross section.

Moreover, although the example which mounted the four shaping | molding molds 52 on the support stand 12 which has the four support parts 12B was shown in the said embodiment, of the shaping | molding die 52 mounted in the support part 12B and the said support part. As long as the number is plural, any number of 2, 3, 5 to 8 may be used.

The present invention will be summarized below with reference to the drawings.
As shown in FIG. 1, the glass molded body manufacturing apparatus 1 of the present invention includes a support base 12, a plurality of molds 52 that are juxtaposed along the transport path on the support base 12, and contain a glass material 60 therein, The first and

second heating chambers

20 and 22 for heat-treating the glass material provided along the conveyance path, the rotary table 4 that sequentially conveys the plurality of mold units 8 including the glass material, Soaking chamber 24, press chamber 26 that presses the glass material accommodated in the mold to form a molded body, and first and

second annealing chambers

28 and 30 that slowly cool the molded body. A plurality of processing units, and

heaters

32, 34, 36, 38, 40, and 42 provided along the conveyance paths of the plurality of processing units. As shown in FIGS. 2 and 3, the glass molded body manufacturing apparatus 1 is further provided in the heating unit (first heating chamber 20, second heating chamber 22) or soaking chamber 24, A plurality of shielding mechanisms 62 that can be moved so that each of the molding dies 52 can be shielded from the heater 32, and a control unit 70 that controls the shielding time for shielding the corresponding molding dies 52 by the plurality of shielding mechanisms 62, respectively. The control unit 70 controls the shielding time of the plurality of shielding mechanisms 62 so that the temperatures of the plurality of molds 52 of each mold unit 8 become substantially uniform.

In addition, the glass molded body manufacturing method of the present invention is a method using the manufacturing apparatus 1 described above, and includes a heating step of performing a heat treatment on the glass material in the first and

second heating chambers

20 and 22, and a leveling process. In the heat chamber 24, in the soaking step for soaking the glass material, in the press chamber 26, the press step for pressing the glass material to form a molded body, and in the first and

second annealing chambers

28, 30, A cooling step for cooling the molded body, and in the heating step or the soaking step, the shielding time of the plurality of shielding mechanisms 62 so that the temperatures of the plurality of molds of each mold unit 8 become substantially uniform. To control each.

DESCRIPTION OF SYMBOLS 1,101 Manufacturing apparatus 2 Apparatus housing 4 Turntable 6 Inner casing 8 Mold unit 10 Turntable 12 Support stand 20 1st heating chamber 22 2nd heating chamber 24 Soaking part 26 Press chamber 28 1st slow cooling chamber 30 1st 2

Slow cooling chambers

32, 34, 36, 38, 40, 42 Heater 52 Mold 60 Glass material 62 Shielding mechanism 64 Shielding portion 66 Shaft portion 68 Lifting mechanism 70 Control portion 120 Heating chamber 122 First soaking chamber 124 First press Chamber 126 Slow cooling chamber 128 Second soaking chamber 130 Second press chamber 132

Slow cooling chamber

134, 136, 138, 140, 142, 144, 146 Heater

Claims

A transport mechanism that sequentially transports a plurality of mold units including a support member and a plurality of molds juxtaposed along the transport path to the support member and containing a glass material therein;
A heating unit that heat-treats the glass material provided along the transport path, a heat-uniforming unit that soaks the glass material, a press unit that presses the glass material to form a molded body, and the A plurality of processing parts including a slow cooling part for performing a slow cooling process on the molded body;
A heater provided along the transport path of the plurality of processing units, and a glass molded body manufacturing apparatus comprising:
The glass molded body manufacturing apparatus further includes a plurality of shielding mechanisms provided in the heating unit or the soaking unit, and movable so as to shield the plurality of molds from the heaters, respectively.
A control unit for controlling a shielding time for shielding the corresponding mold by the plurality of shielding mechanisms,
The said control part is a manufacturing apparatus of the glass molded object which respectively controls the said shielding time of these shielding mechanisms so that the temperature of each metal mold | die of these mold units may become substantially uniform.
In the control unit, the temperature history of each mold of each mold unit measured when the glass molded body is manufactured by the glass molded body manufacturing apparatus is recorded,
2. The glass molded body according to claim 1, wherein the control unit controls the shielding time of the plurality of shielding mechanisms according to a temperature history of each die of the recorded die units. Manufacturing equipment.
Furthermore, it has a temperature measuring unit for measuring the temperature of each mold of each mold unit,
The control unit is configured to control the plurality of shielding mechanisms so that the temperatures of the molds are substantially uniform according to the temperature of the molds of the mold units measured by the temperature measurement unit. The manufacturing apparatus of the glass molded object of Claim 1 which controls each shielding time.
The apparatus for producing a glass molded body according to any one of claims 1 to 3, wherein three or more molds are juxtaposed along the transport path on the support member.
The press part includes a first press part and a second press part,
The soaking part includes a first soaking part and a second soaking part,
The first soaking part is provided on the upstream side of the transport path of the first press part,
The second soaking part is provided on the upstream side of the transport path of the second press part,
The said shielding mechanism is a manufacturing apparatus of the glass molded object as described in any one of Claim 1 to 4 provided in each of said 1st soaking part and 2nd soaking part.
A transport mechanism that sequentially transports a plurality of mold units including a support member and a plurality of molds juxtaposed along the transport path to the support member and containing a glass material therein;
A heating unit that heat-treats the glass material provided along the transport path, a heat-uniforming unit that soaks the glass material, a press unit that presses the glass material to form a molded body, and the A plurality of processing parts including a slow cooling part for performing a slow cooling process on the molded body;
A heater provided along the transport path of the plurality of processing units;
A plurality of shielding mechanisms provided in the heating unit or the soaking unit, and movable so as to shield the plurality of molds from the heaters;
A method of manufacturing a glass molded body with a glass molded body manufacturing apparatus comprising: a control unit that controls a shielding time for shielding a corresponding mold by the plurality of shielding mechanisms;
The method
In the heating unit, a heating step of performing a heat treatment on the glass material;
In the soaking part, soaking step for soaking the glass material,
A press step of pressing the glass material in the press section to form a molded body;
A cooling step for cooling the molded body in the slow cooling section,
In the heating step or the soaking step, the shielding time of the plurality of shielding mechanisms is respectively controlled so that the temperatures of the molds of the plurality of mold units become substantially uniform. Production method.
In the control unit, the temperature history of each mold is recorded for each mold unit, which is measured when the glass molded body is manufactured by the glass molded body manufacturing apparatus,
In the heating step or the soaking step, the control unit controls the shielding time of the plurality of shielding mechanisms according to the temperature history of each die recorded for each die unit. Item 7. A method for producing a glass molded article according to Item 6.
The glass molded body manufacturing apparatus further includes a temperature measuring unit that measures the temperature of each mold for each mold unit,
In the heating step or the soaking step,
Measure the temperature of each mold on each mold unit by the temperature measuring unit,
According to the temperature of each mold of each mold unit measured by the temperature measurement unit, the temperature of each mold of the plurality of mold units is substantially uniform by the control unit. The method for producing a glass molded body according to claim 6, wherein the shielding times of the plurality of shielding mechanisms are respectively controlled.