WO2014129593A1

WO2014129593A1 - Molded glass body manufacturing method, and molded glass body manufacturing device

Info

Publication number: WO2014129593A1
Application number: PCT/JP2014/054202
Authority: WO
Inventors: 剛志石嶺; 英邦浅井; 泰匡和田; 藤本　忠幸; 清鐘山崎
Original assignee: Hoya株式会社
Priority date: 2013-02-25
Filing date: 2014-02-21
Publication date: 2014-08-28
Also published as: TW201500301A; TWI606016B; JP2014162670A; KR101810753B1; CN104968619A; KR20150072440A; JP6114057B2; CN104968619B

Abstract

Provided is a molded glass body manufacturing method which suppresses temperature distribution nonuniformity in the glass material and the mold unit in press processing. This molded glass body manufacturing method involves a heating step in which a glass material is heat processed in a heating chamber by means of a heater, a first and second press step in which the glass material is press-processed in a first and second press chamber while being heated by means of a heater, and a gradual cooling step in which the temperature of the molded body which has completed press processing is lowered in a first and second gradual cooling chamber while being adjusted by means of a heater, wherein in the first and second press steps, the glass material is press-processed twice, and between the two press processings, a mold unit (8) is rotated such that the angular position relative to the conveyance path of the mold unit (8) changes.

Description

Manufacturing method of glass molded body and manufacturing apparatus of glass molded body

The present invention relates to a glass molded body manufacturing method and a glass molded body manufacturing apparatus, and in particular, a glass molded body manufacturing apparatus in which heaters are provided on both sides of a conveyance path of a heating chamber, a press chamber, and a slow cooling chamber, and this The present invention relates to a method for producing a glass molded body using a production apparatus.

In recent years, glass materials such as lenses are formed using an apparatus for producing glass molded bodies by placing glass materials in a mold, heating the glass material and the mold, and press-molding the softened glass material with the mold. The body is being manufactured. As an apparatus for producing such a glass molded body, for example, in Patent Document 1 (Japanese Patent Publication No. 7-29779), a heating chamber, a press chamber, and a slow cooling chamber are arranged in an arc shape, and the inside of a mold is provided. A glass unit that performs heat treatment, press treatment, and slow cooling treatment on a glass material while sequentially transporting the heating chamber, press chamber, and slow cooling chamber by a turntable through a mold unit in which the glass material is disposed. A body manufacturing apparatus is disclosed.

In the apparatus described in Patent Document 1 (Japanese Patent Publication No. 7-29779), heaters are provided on both sides of the transfer path of the mold unit in the heating chamber, the press chamber, and the slow cooling chamber. For this reason, both sides with respect to the conveyance path receive more radiant heat from the heater than the front part and the rear part with respect to the conveyance path of the mold unit, and the temperature of the mold unit and the glass material arranged in the interior thereof. Distribution becomes non-uniform. Such a non-uniform temperature distribution of the mold unit and the glass material causes a shape defect (asp) in the lens.

On the other hand, in Patent Document 2 (Japanese Patent Laid-Open No. 2012-12235), a mold unit on a turntable is rotated in a heating chamber in order to prevent such a lens shape defect (assum) from occurring. An apparatus provided with rotation means is disclosed. According to the apparatus disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 2012-12235), by rotating the mold unit when the mold unit is heated in the heating chamber, it is caused by the arrangement of the heaters before press processing. It is possible to eliminate the uneven temperature distribution of the mold unit and the glass material.

Japanese Patent Publication No. 7-29779 JP 2012-12235 A

However, in the apparatus described in the above-mentioned Patent Document 1 (Japanese Patent Publication No. 7-29779), although it is possible to eliminate the uneven temperature distribution of the mold unit and the glass material that occurs before the press treatment, The uneven temperature distribution that occurs during processing cannot be eliminated. That is, since the heater is provided on both sides of the conveyance path in the press chamber as well as the heating chamber, the both sides of the mold unit with respect to the conveyance path are more separated from the heater than the front part and the rear part with respect to the conveyance path. Due to the large amount of radiant heat, temperature distribution occurs in the mold unit and the glass material. For this reason, there still remains a problem that a molded lens has a shape defect (asm).

An object of the present invention is made in view of the above-described problem, and includes a method for manufacturing a glass molded body and a glass molded body manufacturing apparatus that suppress uneven temperature distribution of a mold unit and a glass material during press processing. Is to provide.

The method for producing a glass molded body of the present invention includes a conveyance mechanism that conveys a mold unit in which a glass material is disposed along a predetermined conveyance path, and a heat treatment performed on the glass material provided along the conveyance path. A heating chamber to perform, a press chamber to press the glass material, a slow cooling chamber to perform a slow cooling process on the formed body, and a heating chamber, a press chamber, and a slow cooling chamber, provided on both sides of the conveyance path. And a heater for heating the glass material with the heater in the heating chamber, and a glass with the heater in the press chamber. While heating the material, in the press step to press the glass material, and in the slow cooling chamber, the temperature of the molded product that has been pressed is lowered while adjusting the temperature with a heater. A slow cooling step, and in the pressing step, the glass material is subjected to press processing a plurality of times, and the mold is such that the relative angular position with respect to the transport path of the mold unit changes during each of the plurality of press processing times. Rotate the unit.
In the present application, “spinning” means that the mold unit rotates around the central axis of the mold unit.

According to the method for producing a glass molded body of the present invention, in the pressing step, the glass material is subjected to the press treatment a plurality of times, and the relative angular position with respect to the conveyance direction of the mold unit is changed during each of the plurality of press treatments. is doing. Thereby, in the press step, the portion facing the heater of the mold unit changes in each of a plurality of press processes, so that the temperature distribution of the mold unit and the glass material generated during the press step is not uniform. Can be suppressed.

Moreover, the manufacturing apparatus of the glass molded body of this invention heats the glass material provided along the conveyance mechanism which conveys the metal mold unit by which the glass material is arrange | positioned inside along a predetermined conveyance path, and a conveyance path. A heating chamber for performing processing, a press chamber for performing press processing on a glass material, a slow cooling chamber for performing slow cooling processing on a molded body after the press processing, and both sides of a conveyance path of the heating chamber, the press chamber, and the slow cooling chamber. An apparatus for manufacturing a glass molded body, comprising: a heater provided; and a rotation mechanism that is provided in the press chamber and rotates the mold unit so that the relative angular position with respect to the conveyance direction of the mold unit changes. .

According to the glass molded body manufacturing apparatus of the present invention, since the rotation mechanism for changing the relative angular position with respect to the conveyance direction of the mold unit is provided in the press chamber, the press process is performed in multiple times, The mold unit can be rotated during processing. Thereby, the nonuniformity of the temperature distribution of the glass unit arrange | positioned in a metal mold unit and a metal mold unit can be suppressed.

According to the present invention, it is possible to suppress uneven temperature distribution of the mold unit and the glass material during the pressing process.

It is a horizontal sectional view showing the composition of the manufacturing device of the glass fabrication object of this embodiment. It is II-II sectional drawing in FIG. It is a vertical sectional view of a mold unit. It is a graph which shows the temperature change of the glass material (glass molded object) in each process for glass shaping | molding in the manufacturing method of the glass molded object of this embodiment, a horizontal axis shows time and the vertical axis | shaft has shown temperature. . It is a figure for demonstrating operation | movement of the autorotation mechanism in a heating chamber. It is a figure which shows the flow of the press process and autorotation process in a 1st press chamber. It is a figure which shows the flow of the press process and rotation process in a 2nd press chamber.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is a horizontal sectional view showing a configuration of a glass molded body manufacturing apparatus according to the present embodiment, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a vertical sectional view of a mold unit.
As shown in FIG.1 and FIG.2, the manufacturing apparatus 1 of the glass molded object of this embodiment is the outer casing 2 formed in the substantially cylindrical shape, the turntable 4 provided in the outer casing 2, and an outer casing. 2 and an inner casing 6 having an arcuate horizontal cross section provided above the turntable 4 in the interior. The outer casing 2, the inner casing 6, and the turntable 4 are arranged coaxially.

The outer casing 2 has a substantially cylindrical space defined therein, and has an opening 2A for loading and unloading the mold unit 8 in a part of the side surface. A shutter (not shown) is attached to the opening 2A, and the shutter is opened when the mold unit 8 is carried in and out. The internal space of the outer casing 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 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. . In the turntable 10, nine circular openings 10A are formed at equal angular intervals on the circumference of a predetermined radius. The opening 10A has a smaller diameter than the bottom 12A of the mold support member 12 constituting the mold unit 8 and a larger diameter than a rotating shaft 14A of a rotation mechanism 14 described later. As will be described later, the mold unit 8 is disposed on the opening 10 A of the turntable 10, and circulates through the processing chambers in the inner casing 6 as the turntable 10 rotates. In the present embodiment, the turntable 4 conveys the mold unit 8 along the circumference of a predetermined radius by the drive mechanism intermittently rotating by a constant angle every predetermined stop time. The path along which the mold unit 8 is transported corresponds to the transport path of the present invention.

Also, the turntable 4 stops for a predetermined time set in advance during each rotation operation. In this stopped state, the opening 10 A formed in the turntable 10 is located immediately above the rotation mechanism 14 provided in each processing chamber. In addition, the stop time of this turntable 4 is determined so that it may become longer than the time which the press process in the 1st and 2nd press process chamber mentioned later requires.

The inner casing 6 is concentrically coaxial with the outer casing 2 and has an inner wall 6A extending in an arc shape over an angular range of 280 degrees in the horizontal direction, and is positioned on the radially outer side of the inner wall 6A and arcuate over an angular range of 280 degrees in the horizontal direction. An outer wall 6B that extends between the inner wall 6A and the upper portion of the outer wall 6B, and a bottom portion 6D that blocks between the inner wall 6A and the lower portion 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 width of the slit 6E is larger than the diameter of the intermediate portion 12B of the mold support member 12 on which the mold unit 8 is placed.

The processing space of the inner casing 6 is divided into seven chambers within a certain angular range in the rotation direction of the turntable 4. These seven chambers are arranged along the conveyance path of the mold unit 8 in the heating chamber 20, the soaking chamber 22, the first press chamber 24, the first annealing chamber 26, the holding chamber 28, the second press chamber 30, and the second chamber. The two slow cooling chambers 32 are arranged in this order. A shutter (not shown) is provided between the circumferential end of the inner casing 6 and each chamber.

The heating chamber 20, the soaking chamber 22, the first press chamber 24, the first annealing chamber 26, the holding chamber 28, the second pressing chamber 30, and the second annealing chamber 32 include

heaters

34, 36, and 38, respectively. , 40, 42, 44, 46 are provided. These

heaters

34, 36, 38, 40, 42, 44, 46 are provided on both sides of the conveyance path of the mold unit 8, and are respectively a heating chamber 20, a soaking chamber 22, a first press chamber 24, The inside of the 1 slow cooling chamber 26, the holding chamber 28, the second press chamber 30, and the second slow cooling chamber 32 is heated to a predetermined temperature.

The first press chamber 24 and the second press chamber 30 have the same configuration, and a press mechanism 47 is provided above the first press chamber 24 of the outer casing 2 as shown in FIG. The press mechanism 47 includes an actuator 47A, such as a hydraulic jack, and a pressing plate 47C attached to the tip of the piston 47B of the actuator 47A, which are accommodated in a storage chamber provided above the ceiling of the outer casing 2. Prepare.

Openings are formed below the actuator 47A main body of the

ceiling portions

2C and 6C of the outer casing 2 and the inner casing 6, respectively. The piston 47B of the actuator 47A is inserted through the openings of the outer casing 2 and the inner casing 6, and the lower end reaches the first and

second press chambers

24, 30. Then, by driving the actuator 47A, the pressing plate 47C descends and presses the mold unit 8 in the first and

second press chambers

24, 30 from above. A support base 45 is provided between the turntable 4 of the turntable 4 below the actuator 47 A and the outer casing 2. The support base 45 is made of, for example, a cylindrical member into which the rotation shaft 14A of the rotation mechanism 14 can be inserted, and supports the turntable 4 from below when the actuator 47A presses the mold unit 8. The deformation of the turntable 4 is prevented.

Further, below the heating chamber 20, the soaking chamber 22, the first press chamber 24, the first slow cooling chamber 26, the holding chamber 28, the second press chamber 30, and the second slow cooling chamber 32, respectively, A rotation mechanism 14 for rotating the mold unit 8 is provided. The rotation mechanism 14 includes, for example, a rotation drive mechanism 14B such as a motor, a rotation shaft 14A that is rotated by the rotation drive mechanism 14B and can be advanced and retracted upward, and a support portion 14C that is provided at the tip of the rotation shaft 14A. Have That is, “autorotation” in this specification means that the mold unit rotates around the central axis of the mold unit.

When the turntable 4 moves, the rotation mechanism 14 moves the rotation shaft 14A until the upper surface of the support portion 14C is lower than the lower surface of the turntable 10 so that the rotation shaft 14A and the support portion 14C do not interfere with the turntable 4. Regress. Hereinafter, the state in which the rotating shaft 14 A is retracted until the support portion 14 C becomes lower than the turntable 10 is referred to as a standby state of the rotation mechanism 14.

Further, the rotation mechanism 14 is in a state where the turntable 4 is in a stopped state, that is, while performing processing on the mold unit 8 in each of the

processing chambers

20, 22, 24, 26, 28, 30, 32. The mold unit 8 is rotated.

In this embodiment, the rotation mechanism 14 provided in the first press chamber 24 and the second press chamber 30 intermittently causes the mold unit 8 to be 90 degrees at a predetermined timing. On the other hand, the autorotation mechanism 14 provided in the soaking chamber 22, the first annealing chamber 26, the holding chamber 28, and the second annealing chamber 32 rotates while performing processing in these processing chambers. The unit is rotated 360 degrees continuously.

When the rotation mechanism 14 provided in the first press chamber 24 and the second press chamber 30 rotates the mold unit 8, first, the rotating shaft 14 A is extended and the metal mounted on the turntable 4. The mold unit 8 is lifted by the support portion 14C. At this time, as described above, while the processing is performed on the mold unit 8 in each processing chamber, the turntable 4 stops in a state where the opening 10 A formed in the rotating disk 10 is positioned above the rotation mechanism 14. Therefore, the extended rotating shaft 14A can be inserted through the opening 10A. With the mold unit 8 lifted in this way, the rotation drive mechanism 14B rotates and rotates the rotation shaft 14A by 90 degrees. Then, the rotating shaft 14A is retracted again to return to the standby state. The rotation mechanism 14 can repeat such a rotation operation a plurality of times.

In addition, the rotation mechanism 14 provided in the heating chamber 20, the soaking chamber 22, the first annealing chamber 26, the holding chamber 28, and the second annealing chamber 32 has a rotating shaft 14A immediately after the turntable 4 stops. The mold unit 8 placed on the turntable 4 is lifted by the support portion 14C. In this state, the mold unit 8 is continuously rotated 360 degrees at a constant angular velocity during the stop time of the turntable 4. Then, immediately before the turntable 4 is driven again, the rotation mechanism 14 retracts the rotating shaft and returns to the standby state.

Further, a quenching section 48 and an exchange section 50 are formed between the second annealing chamber 32 and the heating chamber 20 in the conveyance path in the outer casing 2. The rapid cooling section 48 is an area for rapidly cooling the mold unit 8 conveyed from the second slow cooling chamber 32, and no heater is arranged around it, and the temperature is substantially the same as the outside of the apparatus. In addition, the exchange unit 50 includes a mold unit 8 in which a glass molded body that has been molded is accommodated and a mold unit in which a new glass material that has not been molded is accommodated through the opening 2A of the outer casing 2. This is an area for exchanging 8.

As shown in FIG. 3, the mold unit 8 includes a mold 52 and a mold support member 12, and the mold 52 is attached to the mold support member 12. The metal mold (molding mold) 52 includes an upper mold 54 and a lower mold 56 having molding surfaces formed in accordance with the shape of the glass molded body to be manufactured, and the radial positions of the upper mold 54 and the lower mold 56. And a body mold 58 for regulating the above. 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.

In addition, in the manufacturing method of the glass molded object of this embodiment, the press process is performed twice with respect to the metal mold unit 8 in each of the 1st and 2nd press step. And the relative angular position with respect to the conveyance path | route of a die unit is changed between the 1st press process in each press step, and the 2nd press process.

However, the relative angular position of the mold unit 8 when performing the first pressing process in each pressing step does not have to be the same as the initial relative angular position immediately after being transferred to the

pressing chambers

24 and 30. In addition, the relative angular position of the mold unit 8 when performing the second pressing process does not have to be the same as the initial relative angular position when the mold unit 8 is unloaded from the

press chambers

24 and 30. The relative angular position of the mold unit 8 during the first press process in each pressing step and the relative angular position of the mold unit during the second press process are not uniform in the temperature distribution of the glass material. It is thought to affect the efficiency of the decline.
Furthermore, it is thought that the time of the 1st time and the 2nd press processing also affects the efficiency of the uneven fall of the temperature distribution of glass material.

Therefore, the inventors set the relative angular position of the mold unit 8 when performing the first and second press processes for each of the first and second press steps, and more preferable first and second press processes. The time was set to a plurality of conditions to produce a glass molded body, and the occurrence of defective shape (as) of the glass molded body was observed.

As a result, in the first press step, the time of about 35% of the total press processing time of the first press step in the state of rotating 270 degrees with respect to the initial relative angular position (the expansion time of the actuator 47A of the press mechanism 47 is set). The first press process is performed, and the time is approximately 65% of the total press process time of the first press step in the same state as the initial relative angular position (including the expansion / contraction time of the actuator 47A of the press mechanism 47). It has been found desirable to perform the second press treatment.

In the second press step, the first time over the time of about 14% of the total press processing time of the second press step (including the expansion / contraction time of the actuator 47A of the press mechanism 47) in the same state as the initial relative angle position. For about 86% of the total press processing time of the second press step (including the expansion / contraction time of the actuator 47A of the press mechanism 47) in a state of rotating 90 degrees with respect to the initial relative angular position. It has been found desirable to perform a second press treatment.

Hereinafter, a method of manufacturing a glass molded body by the glass molded body manufacturing apparatus 1 of the present embodiment based on the above examination will be described. In the following description, a method for manufacturing a glass molded body will be described with a focus on one mold unit 8, but in the glass molded body manufacturing apparatus 1 of the present embodiment, a plurality of mold units 8 are provided. It is continuously conveyed along the conveyance path by the turntable 4, and processing such as heating, pressing, and slow cooling is performed in parallel in each processing chamber. In addition, FIG. 4 is a graph which shows the temperature change of the glass material (glass forming body) 60 in each process for glass shaping | molding in the manufacturing method of the glass forming body of this embodiment, and a horizontal axis shows time and is vertical. The axis indicates the temperature.

When the turntable 4 rotates and the mold unit 8 that accommodates the glass molded body that has undergone the molding process reaches the replacement unit 50, the shutter of the opening 2A of the outer casing 2 is opened. When the shutter of the opening of the outer casing 2 is thus opened, the mold unit 8 that has completed the molding process is taken out through the opening 2A, and the mold unit 8 containing the new glass material is turned. It arrange | positions on the opening 10A formed in the turntable 10 of the table 4. FIG.

When the preset stop time of the turntable 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, and the turntable 4 is again turned on. Rotate a certain angle. Thus, the mold unit 8 is conveyed into the heating chamber 20 while being held by the mold support member 12. At this time, the mold support member 12 passes through the slit 6E provided at the bottom of the inner casing 6, and the mold support member 12 and the inner casing 6 do not interfere with each other.

When the mold unit 8 is conveyed to the heating chamber 20, a heating step is performed. The inside of the heating chamber 20 is maintained at a temperature equal to or higher than the glass yield point temperature (Ts) by the heaters 34 provided on both sides of the conveyance path. Thereby, the glass material 60 in the mold unit 8 conveyed into the heating chamber 20 is heated to about the glass yield point temperature (Ts).

FIG. 5 is a diagram for explaining the operation of the rotation mechanism 14 in the heating chamber 20. As shown in the figure, when the mold unit 8 is transported into the heating chamber 20, the rotating shaft 14A of the rotation mechanism 14 provided below the heating chamber 20 extends upward, and is supported by the support portion 14C. The mold unit 8 is lifted. In this state, the rotation drive mechanism 14B of the rotation mechanism 14 continuously rotates the mold unit 8 360 degrees during a time slightly shorter than the stop time of the turntable 4. Then, immediately before the turntable 4 is driven again, the rotation mechanism 14 retracts the rotating shaft 14A and returns to the standby state.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 rotates again by a certain angle. . As a result, the mold unit 8 is conveyed into the soaking chamber 22 while being held by the mold support member 12.

When the mold unit 8 is transported to the soaking chamber 22, a soaking step is performed. The inside of the soaking chamber 22 is maintained at a glass yield point temperature (Ts) by a heater 36. Then, like the heating chamber 20, the rotation mechanism continuously rotates the mold unit 8 360 degrees during a time slightly shorter than the stop time of the turntable 4. Thereby, the temperature distribution of the glass material 60 in the mold unit 8 and the mold unit 8 is made uniform.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 rotates again by a certain angle. . Accordingly, the mold unit 8 is conveyed into the first press chamber 24 while being held by the mold support member 12.

When the mold unit 8 is conveyed to the first press chamber 24, the first press step is performed. In the present embodiment, the pressing process is performed twice in the first pressing step. FIG. 6 is a diagram showing the flow of press processing and rotation processing in the first press chamber 24. As shown in the figure, when the turntable 4 completes its rotation and stops, the mold unit 8 is intermittently rotated 90 degrees counterclockwise by the rotation mechanism 14 before the first press process. The rotation process is performed three times. As a result, the mold unit 8 has a relative angular position (hereinafter referred to as a relative angular position) based on the conveyance path 270 counterclockwise with respect to the relative angular position conveyed to the first press chamber 24. It will be in a state where it has rotated.

Next, the actuator 47A of the press mechanism 47 is driven, and the press mechanism 47 causes the mold unit 8 to have a time of about 35% of the total press processing time of the first press step (including the expansion / contraction time of the actuator 47A of the press mechanism 47). ), The first press process P1 is performed. The inside of the first press chamber 24 is heated by the heaters 38 provided on both sides of the conveyance path so as to keep the mold unit 8 at the glass yield point temperature (Ts). For this reason, due to the radiant heat from the heater 38, the temperature of the portion of the mold unit 8 facing the heater 38 (that is, the portion on both sides with respect to the transport path) increases, and the temperature of the front and rear portions of the transport path decreases.

Next, after the first press process is completed, a rotation process for rotating the mold unit 8 by 90 degrees counterclockwise by the rotation mechanism is performed once. As a result, the relative angular position of the mold unit 8 is rotated 360 degrees with respect to the relative angular position conveyed to the first press chamber 24. That is, the mold unit 8 returns to the relative angular position conveyed to the first press chamber 24.

Then, in a state of returning to the relative angular position conveyed to the first press chamber 24, the press mechanism 47 causes the mold unit 8 to have a time of about 65% of the total press processing time of the first press step (press mechanism). (Including the expansion / contraction time of 47 actuators 47A), the second press process P2 is performed.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 rotates again by a certain angle. . Thereby, the mold unit 8 is conveyed into the first annealing chamber 26 while being held by the mold support member 12.

When the mold unit 8 is transferred to the first slow cooling chamber 26, a first slow cooling step is performed. The inside of the first slow cooling chamber 26 is maintained at a temperature equal to or slightly lower than a temperature (Tg + 10 ° C.) 10 ° C. higher than the glass transition temperature by the heaters 40 provided on both sides of the transport path. However, the temperature in the first slow cooling chamber 26 is controlled by the heater 40 so as not to fall below the glass transition temperature. Thereby, the temperature of the primary molded body (glass material after the first press step) in the mold unit 8 conveyed into the first slow cooling chamber 26 is 10 ° C. higher than the glass transition temperature (Tg + 10 ° C.). ) Slowly cooled to a degree. At this time, like the heating chamber 20 and the like, the rotation mechanism 14 continuously rotates the mold unit 8 360 degrees during a time slightly shorter than the stop time of the turntable 4.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 rotates again by a certain angle. . Thus, the mold unit 8 is conveyed from the first slow cooling chamber 26 into the holding chamber 28 while being held by the mold support member 12.

When the mold unit 8 is transferred to the holding chamber 28, the first slow cooling step is performed. The inside of the holding chamber 28 is maintained at a temperature (Tg + 10 ° C.) about 10 degrees higher than the glass transition temperature by the heaters 42 provided on both sides of the transport path. At this time, like the slow cooling chamber 26, the rotation mechanism 14 continuously rotates the mold unit 8 360 degrees during a time slightly shorter than the stop time of the turntable 4.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 rotates again by a certain angle. . Thereby, the mold unit 8 is conveyed from the holding chamber 28 into the second press chamber 30 while being held by the mold support member 12.

When the mold unit 8 is transferred to the second press chamber 30, a second press step is performed. In the present embodiment, the pressing process is performed twice also in the second pressing step. FIG. 7 is a diagram showing the flow of press processing and rotation processing in the second press chamber 30. The inside of the second press chamber 30 is kept at a temperature lower than the glass transition temperature (Tg) by the heater 44. As shown in FIG. 6, when the turntable 4 completes its rotation and stops, the actuator 47A of the press mechanism 47 is driven in the second press chamber 30, and all presses in the second press step are performed by the press mechanism 47. The first press process P3 is performed on the mold unit 8 for a time of about 14% of the processing time (including the expansion / contraction time of the actuator A of the press mechanism). Note that the pressure applied to the glass material 60 in the press process performed in the second press chamber 30 is very small compared to the pressure applied to the glass material 60 in the press process performed in the first press chamber 24. In the second press chamber 30 as well as in the first press chamber 24, the temperature distribution is uneven in the mold unit 8 and the primary molded body 60 in the mold unit 8 during the first press process. . For this reason, after the first press process is completed, the rotation process for rotating the mold unit 8 90 degrees by the rotation mechanism 14 is performed once. Thereby, a relative angular position (hereinafter referred to as a relative angular position) based on the conveyance path of the mold unit 8 is 90 degrees counterclockwise with respect to the relative angular position conveyed to the second press chamber 30. Change.

Next, in a state of rotating 90 degrees with respect to the relative angular position conveyed to the second press chamber 30, the press mechanism 47 causes the press mechanism 47 to spend approximately 86% of the total press processing time (the press mechanism). The second press process P4 is performed on the die unit 8 over a period of time including the expansion and contraction time of the actuator. As described above, the inside of the second press chamber 30 is maintained at a temperature lower than the glass transition temperature (Tg) by the heater 44. For this reason, the temperature of the primary molded object 60 falls to below a glass transition temperature (Tg) during the 2nd press process.

Then, after the second press process is completed, the rotation process for rotating the mold unit 8 90 degrees counterclockwise by the rotation mechanism 14 is performed three times. As a result, the relative angular position of the mold unit 8 changes by 360 degrees with respect to the relative angular position conveyed to the first press chamber 24, that is, returns to the relative angular position conveyed to the first press chamber 24.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each processing chamber is opened, and the turntable 4 rotates again by a predetermined angle. To do. Thereby, the mold unit 8 is conveyed into the second slow cooling chamber 32 while being held by the mold support member 12.

When the mold unit 8 is transported to the second slow cooling chamber 32, a second slow cooling step is performed. The inside of the second slow cooling chamber 32 is maintained at a predetermined temperature lower than the glass transition temperature by the heaters 46 provided on both sides of the transport path. Thereby, the mold unit 8 conveyed into the second slow cooling chamber 32 and the secondary molded body in the mold unit 8 (primary molded body after the second pressing step) are slowly cooled. At this time, like the heating chamber 20 and the like, the rotation mechanism 14 continuously rotates the mold unit 8 360 degrees during a time slightly shorter than the stop time of the turntable 4.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each processing chamber is opened, and the turntable 4 rotates again by a predetermined angle. To do. Thereby, the mold unit 8 is conveyed to the quenching section 48 outside the inner casing 6 while being held by the mold support member 12.

When the mold unit 8 is conveyed to the rapid cooling section 48, a rapid cooling step is performed. The quenching section 48 is not provided with a heater and has a temperature similar to that around the apparatus. For this reason, the mold unit 8 is rapidly cooled.

When a preset stop time of the turntable 4 elapses from the previous rotation, the shutter provided between the circumferential end of the inner casing 6 and each processing chamber is opened, and the turntable 4 rotates again by a predetermined angle. To do. As a result, the mold unit 8 is conveyed to the replacement unit 50 while being held by the mold support member 12.

When the mold unit 8 is conveyed to the exchange unit 50, an exchange step is performed. When the rotation of the turntable 4 is completed and the mold unit 8 that accommodates the glass molded body that has undergone the molding process reaches the replacement unit 50, the shutter of the opening 2A of the outer casing 2 is opened. When the shutter of the opening 2A of the outer casing 2 is opened, the mold unit 8 for which the molding process has been completed is taken out through the opening 2A. Then, the mold unit 8 in which the new glass material 60 is accommodated is placed on the turntable 10 of the turntable 4.

As described above, according to the present embodiment, in the first and second press steps, the press process is performed a plurality of times (twice), and the rotation mechanism transports the press process during the plurality of press processes. The mold unit 8 is rotated so that the relative angular position with respect to the path changes. As a result, during the second press process, a part different from the part facing the

heaters

38, 44 faces the

heaters

38, 44 during the first press process. This prevents a part of the mold unit 8 from being heated by the

heaters

38 and 44 during the pressing process, and the temperature distribution of the glass unit accommodated in the mold unit 8 and the mold unit 8 is not uniform. Can be eliminated. And since the nonuniformity of the temperature distribution of glass material is eliminated, the shape defect (asp) which generate | occur | produces in a glass molded object can be reduced.

In particular, in the present embodiment, in the first and second press steps, the relative angular position of the mold unit 8 is rotated by 90 degrees or 270 degrees during the first and second press processes. For this reason, the side part with respect to the conveyance path | route of the die unit 8 which faced the

heaters

38 and 44 by the 1st press process is located in the front-back direction of a conveyance path | route by the 2nd press process. Become. Thereby, the nonuniformity of the temperature of the mold unit 8 and the glass material can be eliminated more reliably.

Furthermore, in the present embodiment, the relative angular position with respect to the transport direction when the mold unit 8 is transported into the first or

second press chamber

24, 30 and the mold unit 8 is the first or second gradual. The relative angular positions with respect to the transport direction when transported to the cold room are substantially equal. In other words, in the first and second press steps, the mold unit 8 has just made one rotation (or a plurality of rotations). For this reason, during the pressing process, the entire circumference of the mold unit 8 can surely face the

heaters

38 and 44, and the uneven temperature of the mold unit 8 and the glass material can be more reliably eliminated.

In this embodiment, the second press process in the second press step is started from a state where the temperature of the glass material is higher than the glass transition temperature, and is performed until the temperature of the glass material becomes lower than the glass transition temperature. Is called. For this reason, since a glass material solidifies during a press process, a glass material does not deform | transform. Thereby, the shape defect (asp) which generate | occur | produces in a glass forming body can be reduced further.

In addition, the relative angle position of the die unit 8 and the time of the press process in the first and second press processes of the first and second press steps are not limited to the above embodiment, and can be changed as appropriate. it can.

Further, in the above embodiment, in the rotation processing in the first and second pressing processes, the rotation is performed by 90 degrees counterclockwise, but the rotation angle in the rotation processing can be freely set.

In the present embodiment, the first and second press steps are performed, but the press step may be performed only once. In the present embodiment, the press process is performed twice in each of the first and second press steps. However, the present invention is not limited to this, and the press process may be performed three times or more.

Finally, this embodiment will be summarized with reference to the drawings.
In the method for producing a glass molded body of the present invention, the turntable 4 that transports the mold unit 8 in which the glass material 60 is disposed along a predetermined transport path, and the glass material 60 that is provided along the transport path. The heating chamber 20 for performing the heat treatment, the first and

second press chambers

24 and 30 for performing the press treatment on the glass material 60, and the first and second gradual processing for performing the slow cooling treatment on the molded body after the press treatment is completed. The cooling chambers 26 and 32, the heating chamber 20, the first and

second press chambers

24 and 30, and the heaters 34 provided on both sides of the transport path of the first and second slow cooling

chambers

26 and 32, 38, 40, 44, 46, a method of manufacturing a glass molded body using the glass molded body manufacturing apparatus 1, and a heating step in which the glass material 60 is heated by the heater 34 in the heating chamber 20. And the first and In the

second press chambers

24 and 30, the glass material 60 is heated by the

heaters

38 and 44 while the glass material 60 is pressed, and the first and second slow cooling chambers 26 are pressed. 32, a slow cooling step of lowering the temperature of the formed body after the press processing is completed while adjusting the temperature by the

heaters

40, 46, and the first and second pressing steps as shown in FIGS. In addition, the glass material 60 is pressed twice, and the mold unit is rotated so that the relative angular position of the mold unit 8 with respect to the conveyance path changes between the two press processes.

In addition, the glass molded body manufacturing apparatus 1 of the present invention is provided along the turntable 4 and the turntable 4 that convey the mold unit 8 in which the glass material 60 is disposed along a predetermined conveyance path. The glass chamber 60 is subjected to heat treatment, the glass material 60 is subjected to first and

second press treatments

24 and 30, and the formed product is subjected to slow cooling. Both sides of the conveying path of the first and second slow cooling chambers 26 and 32, the heating chamber 20, the first and

second press chambers

24 and 30 and the first and second slow cooling chambers 26 and 32 for processing. A glass molded body manufacturing apparatus 1 provided with

heaters

34, 38, 40, 44, and 46 provided on the first and second press chambers for conveying the mold unit 8 Mold so that the relative angular position relative to the direction changes Further comprising a rotation mechanism 14 for rotating the knitted.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Outer casing 4 Turntable 6 Inner casing 8 Mold unit 10 Turntable 12 Mold support member 14 Rotating mechanism 20 Heating chamber 22 Soaking chamber 24 First press chamber 26 First annealing chamber 28 Holding chamber 30 Second Press chamber 32

Second annealing chamber

34, 36, 38, 40, 42, 44, 46 Heater 45 Support base 47 Press mechanism 48 Rapid cooling section 50 Replacement section 52 Mold 60 Glass material

Claims

A conveyance mechanism that conveys a mold unit in which a glass material is arranged along a predetermined conveyance path, a heating chamber that performs heat treatment on the glass material provided along the conveyance path, and a press on the glass material A press chamber for performing processing, a slow cooling chamber for performing slow cooling processing on the pressed molded body, and heaters provided on both sides of the conveyance path of the heating chamber, the press chamber, and the slow cooling chamber. A method for producing a glass molded body by a glass molded body production apparatus,
In the heating chamber, a heating step of performing a heat treatment on the glass material with the heater;
In the press chamber, while the glass material is heated by the heater, a press step for pressing the glass material;
In the slow cooling chamber, a slow cooling step of lowering the temperature of the pressed molded body while adjusting the temperature by the heater, and
In the pressing step, the glass material is pressed a plurality of times, and the mold unit rotates so that a relative angular position of the mold unit with respect to the conveyance path changes during each of the plurality of times of the pressing process. A method for producing a glass molded body.
The press room
A first press chamber provided along the transfer path between the heating chamber and the slow cooling chamber;
A second press chamber provided on the downstream side of the transport path with respect to the slow cooling chamber,
The glass forming according to claim 1, wherein the pressing step includes the first pressing step performed in the first pressing chamber and the second pressing step performed in the second pressing chamber. Body manufacturing method.
The second pressing step includes
Performed while slowly cooling the glass material,
Starting from a state where the temperature of the glass material is higher than the glass transition temperature;
The manufacturing method of the glass forming body of Claim 2 performed until the temperature of the said glass material becomes lower than a glass transition temperature.
In the second pressing step, the glass material is subjected to a plurality of press processes,
The first press treatment is performed in a state where the temperature of the glass material is higher than the glass transition temperature,
The glass forming according to claim 2 or 3, wherein the second press treatment is started from a state in which the temperature of the glass material is higher than the glass transition temperature and is performed until the temperature of the glass material becomes lower than the glass transition temperature. Body manufacturing method.
In the second press step, two press processes are performed,
The first press process in the second press step is performed in a state where the mold unit is equal to the initial relative angular position with respect to the transport direction when the mold unit is transported to the second press chamber,
The second pressing process in the second pressing step is performed in the clockwise or counterclockwise direction with respect to the initial relative angular position with respect to the transport direction when the mold unit is transported to the second press chamber. The manufacturing method of the glass molded object of Claim 4 performed in the state with the relative angular position which rotated 90 degree | times to any one of the surrounding directions.
The relative angular position with respect to the transport direction when the mold unit is transported into the press chamber and the relative angular position with respect to the transport direction when the mold unit is transported to the slow cooling chamber are substantially equal. The manufacturing method of the glass forming body of any one of Claim 2 to 5.
In the first press step, two press processes are performed,
The first pressing process in the first pressing step is performed clockwise or counterclockwise with respect to an initial relative angular position with respect to the transport direction when the mold unit is transported to the first press chamber. Is performed in a state where there is a relative angular position rotated by 270 degrees in any one direction,
The glass according to any one of claims 2 to 6, wherein the second pressing process in the first pressing step is performed in a state where the mold unit is at the same relative angular position as the initial relative angular position. Manufacturing method of a molded object.
The transport mechanism includes a turntable,
The said heating chamber, a press chamber, and a slow cooling chamber are the manufacturing methods of the glass molded object as described in any one of Claim 1 to 7 arrange | positioned along the circumference on the said turntable.
The said mold unit is described in any one of Claim 1 to 8 which has a shaping | molding die which has a shaping | molding surface corresponding to the shape of the said glass molded object, and the type | mold support member holding the said shaping | molding die. A method for producing a glass molded body.
A transport mechanism for transporting a mold unit in which a glass material is disposed along a predetermined transport path;
A heating chamber for performing a heat treatment on the glass material provided along the transport path, a press chamber for performing a press treatment on the glass material, and a slow cooling chamber for performing a slow cooling treatment on the formed body after the press treatment; A heater provided on both sides of the conveying path of the heating chamber, the press chamber and the slow cooling chamber, and a glass molded body manufacturing apparatus comprising:
An apparatus for manufacturing a glass molded body, further comprising a rotation mechanism provided in the press chamber and configured to rotate the mold unit so that a relative angular position of the mold unit with respect to the transport direction changes.
The press room
A first press chamber provided along the transfer path between the heating chamber and the slow cooling chamber;
The manufacturing apparatus of the glass molded object of Claim 10 containing the 2nd press chamber provided in the downstream of the said conveyance path | route with respect to the said slow cooling chamber.
The transport mechanism includes a turntable,
The said heating chamber, a press chamber, and a slow cooling chamber are the manufacturing apparatuses of the glass molded object described in Claim 10 or 11 arrange | positioned along the circumference on the said turntable.
The said mold unit is described in any one of Claims 10-12 which has a shaping | molding die which has a shaping | molding surface corresponding to the shape of the said glass molded object, and the type | mold support member holding the said shaping | molding die. Equipment for manufacturing glass moldings.