TW201500301A - Molded glass body manufacturing method, and molded glass body manufacturing device - Google Patents

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

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

The present invention relates to a method for producing a glass molded body and a device for producing a glass molded body, and more particularly to a manufacturing apparatus for a glass molded body provided with a heater on both sides of a transport path of a heating chamber, a press chamber, and a slow cooling chamber, and using the same A method of producing a glass molded body of the production apparatus.

In recent years, a glass molded body such as a lens has been produced by disposing a glass material in a mold, heating the glass material and the mold, and press-molding the softened glass material with a mold to produce a glass molded body. For example, Japanese Laid-Open Patent Publication No. Hei 7-29779 discloses a manufacturing apparatus for a glass molded body in which a heating chamber, a pressing chamber, and a cooling chamber are arranged in an arc shape. In the cold chamber, in the mold, the mold unit in which the glass material is disposed inside is sequentially transported to the heating chamber, the pressing chamber, and the slow cooling chamber by the turntable, and the glass material is subjected to heat treatment, pressing treatment, and slow cooling treatment.

In the apparatus described in the patent document 1 (JP-A-7-29779), a heater is provided on both sides of a conveyance path of a mold unit of a heating chamber, a press chamber, and a slow cooling chamber. Therefore, the mold unit receives more radiant heat from the heater than the front and rear portions of the transport path with respect to the front and rear portions of the transport path, and the temperature distribution of the mold unit and the glass material disposed therein Uneven. Such unevenness in the temperature distribution of the mold unit and the glass material is caused by the lens having a shape defect (astigmatism).

In order to prevent the occurrence of such a shape defect (astigmatism) of the lens, the heating unit is provided to rotate the mold unit on the turntable. Self-rotating component. According to the apparatus disclosed in the patent document 2 (JP-A-2012-12235), since the mold unit is rotated by heating the mold unit in the heating chamber, the mold generated by the arrangement of the heater before the press processing can be eliminated. The temperature distribution of the unit and the glass material is uneven.

Patent Document 1: Japanese Special Fair 7-29779

Patent Document 2: Japanese Patent Laid-Open Publication No. 2012-12235

However, in the apparatus described in the above-mentioned Patent Document 1 (Japanese Patent Publication No. Hei 7-29779), the temperature distribution of the mold unit and the glass material which occurs before the press treatment can be eliminated, but the pressurization cannot be eliminated. The temperature distribution generated during processing is uneven. That is, as in the heating chamber, the heater is provided on both sides of the transfer path in the press chamber. Therefore, the mold unit is received from the heater with respect to the front and rear portions of the transport path with respect to the both sides of the transport path. More radiant heat produces a temperature distribution in the mold unit and the glass material. Therefore, there is still a problem that the molded lens has a shape defect (astigmatism).

The present invention has been made in view of the above problems, and an object thereof is to provide a method for producing a glass molded body and a device for producing a glass molded body, which suppress unevenness in temperature distribution of a mold unit and a glass material in a press treatment.

The method for producing a glass molded body of the present invention is a method for producing a glass molded body by a manufacturing apparatus for a glass molded body, and the apparatus for producing a glass molded body includes a conveying mechanism that is disposed along a mold unit in which a glass material is disposed. a predetermined transport path transport; a heating chamber disposed along the transport path to heat the glass material; a press chamber for pressing the glass material; and a slow cooling chamber to slow the molded body after the press treatment is completed And a heater disposed on both sides of the conveying path of the heating chamber, the pressing chamber and the slow cooling chamber, wherein the manufacturing method of the glass molding body comprises: a heating step in the heating chamber, and the glass material by the heater Performing a heat treatment; a pressing step of heating the glass material by a heater in a pressing chamber, and pressing the glass material; and a slow cooling step, adjusting the temperature in the slow cooling chamber by the heater, and pressing The temperature of the molded body after the treatment is lowered, and in the pressing step, the glass material is subjected to a plurality of pressing treatments, which are repeated Each system during processing, all the die unit rotating, so that the mold unit with respect to the transport path of the relative angular position changes.

Further, "rotation" in the above refers to a case where the mold unit is rotated 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 a plurality of press treatments, and the relative angular position of the mold unit with respect to the conveyance direction is changed during each of the plurality of press treatments. Thereby, in the pressing step, the portion of the heater facing the mold unit is changed in each of the plurality of pressing processes, and therefore, the unevenness in the temperature distribution of the mold unit and the glass material generated in the pressing step can be suppressed.

Further, the apparatus for manufacturing a glass molded body of the present invention includes: a feeding mechanism for conveying a mold unit having a glass material disposed therein along a predetermined conveyance path; a heating chamber disposed along the conveyance path to heat the glass material; and a pressing chamber for performing the glass material a pressing treatment; and a slow cooling chamber for slowly cooling the molded body after the pressing treatment; and a heater disposed on both sides of the conveying path of the heating chamber, the pressing chamber and the slow cooling chamber, wherein the glass molded body is manufactured The apparatus further includes: a rotation mechanism disposed in the pressing chamber for rotating the mold unit to change a relative angular position of the mold unit with respect to the conveying direction.

According to the apparatus for producing a glass molded body of the present invention, the spinning chamber is provided with a rotation mechanism for changing the relative angular position of the mold unit with respect to the conveying direction, so that the pressing treatment can be divided into a plurality of times, and each pressing treatment is performed. The mold unit is rotated during the period. Thereby, unevenness in temperature distribution of the mold unit and the glass material disposed in the mold unit can be suppressed.

According to the present invention, unevenness in temperature distribution of the mold unit and the glass material in the press treatment can be suppressed.

1‧‧‧ manufacturing equipment

2‧‧‧External housing

4‧‧‧ turntable

6‧‧‧Internal housing

8‧‧‧Mold unit

10‧‧‧ rotating disk

12‧‧‧Mold support parts

14‧‧‧Automatic institutions

20‧‧‧heating room

22‧‧‧heating room

24‧‧‧1st suppression room

26‧‧‧1st slow cooling room

28‧‧‧Holding room

30‧‧‧2nd suppression room

32‧‧‧2nd slow cooling room

34, 36, 38, 40, 42, 44, 46‧‧‧ heaters

45‧‧‧Support table

47‧‧‧Compression institutions

48‧‧‧Quenching Department

50‧‧‧Exchange Department

52‧‧‧Mold

60‧‧‧glass materials

Fig. 1 is a horizontal sectional view showing the structure of a manufacturing apparatus of a glass molded body of the present embodiment.

Figure 2 is a cross-sectional view taken along line II-II of Figure 1.

Figure 3 is a longitudinal sectional view of the mold unit.

Fig. 4 is a graph showing a temperature change of a glass material (glass molded body) in each treatment for performing glass molding in the method for producing a glass molded body of the present embodiment, wherein the horizontal axis represents time and the vertical axis represents temperature.

Fig. 5 is a view for explaining the operation of the rotation mechanism of the heating chamber.

Fig. 6 is a view showing a flow of a pressing process and a spinning process of the first press chamber.

Fig. 7 is a view showing the flow of the pressing treatment and the rotation processing of the second pressing chamber.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a horizontal sectional view showing the structure of a manufacturing apparatus for a glass molded body according to the present embodiment. Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1 and Fig. 3 is a vertical sectional view of the mold unit.

As shown in FIG. 1 and FIG. 2, the apparatus 1 for manufacturing a glass molded body according to the present embodiment includes an outer casing 2 formed in a substantially columnar shape, and a turntable 4 disposed in the outer casing 2; The inner casing 6 is disposed above the turntable 4 in the outer casing 2, and has a horizontal cross section in an arc shape. The outer casing 2, the inner casing 6, and the turntable 4 are coaxially arranged.

The outer casing 2 has a substantially cylindrical space inside, and has an opening 2A for carrying in and out of the die unit 8 at one side of the side surface. Further, 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 inner space of the outer casing 2 is an inert gas atmosphere. As the inert gas, nitrogen gas, argon gas or the like is used, and the oxygen concentration is preferably 5 ppm or less. Further, by making the internal space an inert gas atmosphere in this way, it is possible to prevent oxidation of the mold unit 8 or deterioration of the surface of the glass material.

The turntable 4 includes: a rotary disk 10; a drive shaft (not shown) connected to the center of the rotary disk 10; and a drive mechanism such as a motor (not shown) Shown) for rotating the drive shaft. In the rotary disk 10, nine circular openings 10A are formed at equal angular intervals on a circumference of a predetermined radius. The opening 10A is formed to have a diameter smaller than the diameter of the bottom portion 12A of the mold supporting member 12 constituting the mold unit 8, and is larger than the diameter of the rotating shaft 14A of the rotation mechanism 14 to be described later. As will be described later, the die unit 8 is disposed on the opening 10A of the rotary disk 10, and is circulated by the respective processing chambers in the inner casing 6 by the rotation of the rotary disk 10. In the present embodiment, the drive mechanism of the turntable 4 is intermittently rotated by a fixed angle every predetermined stop time, and the mold unit 8 is conveyed along the circumference of the predetermined radius. The conveyance path of the mold unit 8 corresponds to the conveyance path of the present invention.

Further, the turntable 4 stops the predetermined time set in advance between the respective rotation operations. In this stopped state, the opening 10A formed in the rotary disk 10 is located directly above the rotation mechanism 14 provided in each processing chamber. Further, the stop time of the turntable 4 is determined to be longer than the time required for the press processing in the first and second press processing chambers to be described later.

The inner casing 6 has an inner wall 6A that extends concentrically coaxially with the outer casing 2 in an arcuate manner in an angular range of 280 degrees in a horizontal direction, and an outer wall 6B that is located radially outward of the inner wall 6A in a horizontal direction. The arcuate extension extends over an angular range of 280 degrees; the top plate portion 6C is for closing between the inner wall 6A and the upper portion of the outer wall 6B; and the bottom portion 6D is for closing between the inner wall 6A and the lower portion of the outer wall 6B. The inner wall 6A, the outer wall 6B, the top plate portion 6C, and the bottom portion 6D form a processing space having an arc shape in a horizontal section in the inner casing 6. At the bottom portion 6D of the inner casing 6, an arc-shaped slit 6E is formed along the conveying path of the die unit 8. The width of the slit 6E is larger than the diameter of the intermediate portion 12B of the mold supporting member 12 on which the mold unit 8 is placed.

The processing space of the inner casing 6 is divided into seven chambers at a fixed angular range along the rotation direction of the turntable 4. The seven chambers along the transport path of the mold unit 8 include a heating chamber 20, a soaking chamber 22, a first pressing chamber 24, a first slow cooling chamber 26, a holding chamber 28, a second pressing chamber 30, and a second slow cooling chamber 32. Arranged in order. A gate (not shown) is provided between the circumferential end of the inner casing 6 and each of the chambers.

Heaters 34, 36, 38 are provided in the heating chamber 20, the soaking chamber 22, the first pressing chamber 24, the first slow cooling chamber 26, the holding chamber 28, the second pressing chamber 30, and the second slow cooling chamber 32, respectively. 40, 42, 44, 46. The heaters 34, 36, 38, 40, 42, 44, 46 are disposed on both sides of the transport path of the mold unit 8, and respectively pair the heating chamber 20, the soaking chamber 22, the first pressing chamber 24, and the first slow cooling The chamber 26, the holding chamber 28, the second pressing chamber 30, and the second slow cooling chamber 32 are heated to have a predetermined temperature.

The first pressurizing chamber 24 and the second pressurizing chamber 30 have the same configuration. As shown in FIG. 2, a pressing mechanism 47 is provided above the first pressing chamber 24 of the outer casing 2. The pressing mechanism 47 includes, for example, an actuator 47A such as a hydraulic jack housed in a housing chamber provided above the top plate portion of the outer casing 2, and a pressing plate 47C mounted to the actuator 47A. The end of the piston 47B.

Openings are formed below the main body of the actuator 47A of the outer casing 2 and the top plate portions 2C, 6C of the inner casing 6. 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 thereof reaches the first and second pressing chambers 24, 30. Then, the pressing plate 47C is lowered by driving the actuator 47A to press the die unit 8 in the first and second pressing chambers 24, 30 from above. Further, a support base 45 is provided between the rotary disk 10 of the turntable 4 below the actuator 47A and the outer casing 2. The support table 45 is provided, for example, by the inner side of the rotation shaft of the rotation mechanism 14 The 14A is formed by inserting a cylindrical member. When the actuator 47A presses the die unit 8, the support base 45 supports the turntable 4 from below to prevent deformation of the turntable 4.

Further, the mold unit 8 is provided below the heating chamber 20, the heat equalizing chamber 22, the first pressing chamber 24, the first slow cooling chamber 26, the holding chamber 28, the second pressing chamber 30, and the second slow cooling chamber 32, respectively. The rotation mechanism 14 that rotates in each room. The rotation mechanism 14 has a rotation drive mechanism 14B such as a motor, a rotation shaft 14A that is rotated by the rotation drive mechanism 14B, and can advance and retreat in the upward direction, and a support portion 14C that is provided at the end of the rotation shaft 14A. That is, "rotation" in the present specification means a case where the mold unit is rotated around the central axis of the mold unit.

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

Further, when the turntable 4 is in the stopped state, that is, while the mold unit 8 is being processed in each of the processing chambers 20, 22, 24, 26, 28, 30, 32, the rotation mechanism 14 rotates the mold unit 8.

In the present embodiment, the rotation mechanism 14 provided in the first pressing chamber 24 and the second pressing chamber 30 intermittently rotates the mold unit 8 by 90 degrees at a predetermined timing. On the other hand, the rotation mechanism 14 provided in the soaking chamber 22, the first slow cooling chamber 26, the holding chamber 28, and the second slow cooling chamber 3 rotates the rotating unit 360 degrees continuously during the processing of the processing chambers.

When the mold unit 8 is rotated by the rotation mechanism 14 provided in the first pressing chamber 24 and the second pressing chamber 30, the rotating shaft 14A is first extended and placed on the turntable 4 The upper mold unit 8 is lifted by the support portion 14C. At this time, as described above, while the mold unit 8 is being processed in each processing chamber, the turntable 4 is stopped in a state where the opening 10A formed in the rotary disk 10 is positioned above the rotation mechanism 14, so that the extended rotary shaft 14A can penetrate. The opening 10A is inserted. In a state where the mold unit 8 is lifted up in this manner, the rotation drive mechanism 14B is rotated to rotate 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.

Further, immediately after the turntable 4 is stopped, the rotation mechanism 14 provided in the heating chamber 20, the soaking chamber 22, the first slow cooling chamber 26, the holding chamber 28, and the second slow cooling chamber 32 extends the rotating shaft 14A. The support unit 14C of the die unit 8 placed on the turntable 4 is lifted up. Further, during the stop time of the turntable 4 in this state, the mold unit 8 is intermittently rotated at a fixed angular velocity of 360 degrees. Further, before the turntable 4 is about to be driven again, the rotation mechanism 14 retracts the rotation shaft to return to the standby state.

Further, a quenching portion 48 and an exchange portion 50 are formed between the second slow cooling chamber 32 and the heating chamber 20 of the conveyance path in the outer casing 2. The quenching portion 48 is a region for quenching the die unit 8 conveyed from the second slow cooling chamber 32, and is not disposed around the heater, and has substantially the same temperature as the outside of the device. Further, the exchange unit 50 is a region for the mold unit 8 in which the molded glass molded body is housed and the mold in which the new glass material is not subjected to the molding process, by the opening 2A of the outer casing 2 Unit 8 exchanges.

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 mold (forming mold) 52 has an upper mold 54 and a lower mold 56, which have molding surfaces, and the molding surface is formed and desired. The shape of the glass molded body to be manufactured is matched; and a main body mold 58 for restricting the mutual mutual position of the upper mold 54 and the lower mold 56 in the radial direction. 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. When the glass material 60 is heated to a temperature higher than the glass relaxation temperature, the upper and lower dies 54 and 56 are pressed in a relatively close direction to transfer the glass material into a molding surface shape, and the glass of a desired shape can be press-molded. Molded body (optical element).

Further, in the method for producing a glass molded body of the present embodiment, the mold unit 8 is subjected to press treatment twice in the first and second pressing steps. Then, the relative angular position of the die unit with respect to the transport path is changed between the first press process and the second press process in each press step.

However, the relative angular position of the mold unit 8 at the time of performing the first pressing treatment in each pressing step need not be the same as the initial relative angular position immediately after being conveyed to each of the press chambers 24 and 30. Further, the relative angular position of the mold unit 8 at the time of performing the second pressing process need not be the same as the initial relative angular position when being carried out from each of the press chambers 24 and 30. Further, the relative angular position of the mold unit 8 during the first pressing treatment in each pressing step and the relative angular position of the mold unit during the second pressing treatment affect the efficiency of the temperature distribution unevenness of the glass material. .

Further, the time of the first and second press treatments also affects the efficiency of the temperature distribution unevenness of the glass material.

Then, in the first and second pressing steps, the inventors respectively perform the relative angular position of the mold unit 8 at the time of performing the first and second pressing processes, and more preferably the first and second pressing processes. Time sets multiple conditions The glass molded body was produced, and the occurrence of poor shape (astigmatism) of the glass molded body was observed.

As a result, it is preferable that in the first pressing step, the state is rotated by 270 degrees with respect to the initial relative angular position, and about 35% of all the pressing treatment time of the first pressing step (including the pressing mechanism 47). The first pressing process is performed in the expansion/contraction time of the actuator 47A, and in the same state as the initial relative angular position, about 65% of all the pressing processing time in the first pressing step (including the pressing mechanism 47) The second pressing process is performed in the expansion and contraction time of the actuator 47A.

Further, it is preferable that in the second pressing step, in the same state as the initial relative angular position, about 14% of all the pressing processing times of the second pressing step (including the actuator 47A of the pressing mechanism 47) The first pressing process is performed within the stretching time), and is rotated by 90 degrees with respect to the initial relative angular position, and 86% of all the pressing processing time of the second pressing step (including the actuation of the pressing mechanism 47) The second pressing process is performed in the expansion and contraction time of the device 47A.

Hereinafter, a method of manufacturing a glass molded body by the apparatus 1 for manufacturing a glass molded body according to the present embodiment discussed above will be described. In the following description, a method of manufacturing a glass molded body will be described focusing on one mold unit 8. However, in the manufacturing apparatus 1 for a glass molded body of the present embodiment, a plurality of mold units 8 are continuously continuous by the turntable 4 The transport path is transported, and processing such as heating, pressing, and slow cooling is performed in parallel in each processing chamber. In addition, FIG. 4 is a view showing a temperature change of a glass material (glass molded body) 60 for performing each process of glass molding in the method for producing a glass molded body of the present embodiment. In the table, the horizontal axis represents time and the vertical axis represents temperature.

When the turntable 4 rotates and the mold unit 8 in which the glass molded body in which the molding process is completed reaches the exchange unit 50, the shutter of the opening 2A of the outer casing 2 is opened. After the gate of the opening of the outer casing 2 is opened, the mold unit 8 whose molding process is completed is taken out to the outside through the opening 2A, and the mold unit 8 in which the new glass material is stored is placed on the turntable 4 It is formed on the opening 10A of the rotary disk 10.

Then, after the predetermined stop time of the turntable 4 has elapsed since the end of the previous rotation operation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the die unit 8 is carried into the heating chamber 20 while being held by the die supporting member 12. At this time, the mold supporting member 12 passes through the slit 6E provided at the bottom of the inner casing 6, and the mold supporting member 12 and the inner casing 6 do not interfere.

When the mold unit 8 is transferred to the heating chamber 20, a heating step is performed. In the heating chamber 20, the heaters 34 provided on both sides of the transport path maintain the temperature equal to or higher than the glass drape temperature (Ts). Thereby, the glass material 60 conveyed in the mold unit 8 in the heating chamber 20 is heated to about the glass sag temperature (Ts).

Fig. 5 is a view for explaining the operation of the rotation mechanism 14 of 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 rotating mechanism 14 disposed below the heating chamber 20 is elongated upward, and the die unit 8 is lifted by the supporting portion 14C. . In this state, the rotation driving mechanism 14B of the rotation mechanism 14 causes the mold unit 8 to continuously rotate 360 degrees in a time shorter than the stop time of the turntable 4. And, on the turntable 4 is about to be Before the secondary drive, the rotation mechanism 14 retracts the rotary shaft 14A and returns to the standby state.

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the die unit 8 is carried into the heat equalizing chamber 22 while being held by the die supporting member 12.

After the mold unit 8 is transferred to the soaking chamber 22, a soaking step is performed. In the soaking chamber 22, the temperature is maintained at about the glass relaxation temperature (Ts) by the heater 36. Further, like the heating chamber 20, the rotation mechanism 14 continuously rotates the mold unit 8 by 360 degrees in a time shorter than the stop time of the turntable 4. Thereby, the temperature distribution of the glass material 60 in the mold unit 8 and in the mold unit 8 is made uniform.

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the mold unit 8 is conveyed to the inside of the first press chamber 24 while being held by the mold supporting member 12.

After the mold unit 8 is transferred to the first press chamber 24, the first pressing step is performed. In the present embodiment, in the first pressing step, the pressing treatment is performed twice. Fig. 6 is a view showing the flow of the pressing process and the spinning process of the first press chamber 24. As shown in the figure, after the rotation of the turntable 4 is completed, the mold unit 8 is rotated 90 degrees counterclockwise by the rotation mechanism 14 three times of the rotation process before the first pressing process. As a result, the relative angular position (hereinafter referred to as the relative angular position) of the mold unit 8 based on the transport path is rotated by 270 degrees in the counterclockwise direction with respect to the relative angular position of the transfer to the first press chamber 24.

Next, the actuator 47A of the pressing mechanism 47 is driven by the pressing mechanism 47 to the mold unit 8 for about 35% of the total pressing time of the first pressing step (including the actuator 47A of the pressing mechanism 47). The first press treatment P1 is performed in the expansion and contraction time). In the first press chamber 24, heating is performed by the heaters 38 provided on both sides of the transport path, whereby the mold unit 8 is held at a glass drape temperature (Ts). Therefore, the temperature of the portion of the mold unit 8 facing the heater 38 (i.e., the portion on both sides of the transport path) is increased by the radiant heat from the heater 38, and the temperature of the portion before and after the transport path is lowered.

Next, after the completion of the first pressing process, the autorotation mechanism performs one rotation process, and the rotation process causes the die unit 8 to rotate 90 degrees counterclockwise. Thereby, the relative angular position of the mold unit 8 is rotated by 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 of the first press chamber 24.

Further, in the state of returning to the relative angular position of the first pressing chamber 24, the pressing unit 47 applies the pressing unit 47 to about 65% of the pressing processing time of the first pressing step (including pressing). The second pressing process P2 is performed in the expansion and contraction time of the actuator 47A of the mechanism 47.

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the mold unit 8 is conveyed to the inside of the first slow cooling chamber 26 while being held by the mold supporting member 12.

After the mold unit 8 is transferred to the first slow cooling chamber 26, a first slow cooling step is performed. In the first slow cooling chamber 26, the temperature is maintained at a temperature 10 ° C higher than the glass transition temperature by the heater 40 provided on both sides of the transport path (Tg +10 ° C) Equivalent, or slightly lower temperature. However, the temperature in the first slow cooling chamber 26 is controlled by the heater 40 so that the glass transition temperature does not decrease. Thereby, the temperature of the primary molded body (the glass material after the first pressing step) transferred into the die unit 8 in the first slow cooling chamber 26 is gradually lowered to a temperature 10 ° C higher than the glass transition temperature (Tg+10). °C) around. Further, at this time, like the heating chamber 20 and the like, the rotation mechanism 14 continuously rotates the mold unit 8 at 360 degrees during a period of time shorter than the stop time of the turntable 4.

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the die unit 8 is transferred from the first slow cooling chamber 26 to the holding chamber 28 while being held by the mold supporting member 12.

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

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the mold unit 8 is carried from the holding chamber 28 to the inside of the second press chamber 30 while being held by the mold supporting member 12.

After the mold unit 8 is transferred to the second press chamber 30, a second pressing step is performed. In the present embodiment, the pressing portion is also performed twice in the second pressing step. Reason. Fig. 7 is a view showing the flow of the pressing process and the spinning process of the second press chamber 30. In the second press chamber 30, the temperature is maintained at a temperature lower than the glass transition temperature (Tg) by the heater 44. As shown in Fig. 6, when the turntable 4 is rotated and is in a stopped state, the actuator 47A of the pressing mechanism 47 is driven in the second press chamber 30, and about 14% of all the press processing time in the second pressing step. In the time (including the expansion and contraction time of the actuator A of the pressing mechanism), the first pressing process P3 is performed on the die unit 8 by the pressing mechanism 47. Further, the pressure applied to the glass material 60 by the press treatment by the second press chamber 30 is very small compared to the pressure applied to the glass material 60 by the press treatment by the first press chamber 24. In the second press chamber 30, as in the case of the first press chamber 24, unevenness in temperature distribution occurs in the primary molded body 60 in the die unit 8 and the die unit 8 during the first press processing. Therefore, after the completion of the first pressing process, the autorotation mechanism 14 performs the autorotation process once, and the autorotation process rotates the die unit 8 by 90 degrees. Thereby, the relative angular position (hereinafter referred to as a relative angular position) of the mold unit 8 based on the conveyance path is changed by 90 degrees in the counterclockwise direction with respect to the relative angular position conveyed to the second press chamber 30.

Then, in the state of being rotated by 90 degrees with respect to the relative angular position conveyed to the second press chamber 30, the pressing mechanism 47 applies the press unit 47 to about 86% of the total press processing time of the second pressing step ( The second pressing process P4 is performed in the expansion and contraction time of the actuator including the pressing mechanism. As described above, in the second press chamber 30, the temperature is maintained lower by the heater 44 than the glass transition temperature (Tg). Therefore, during the second pressing treatment, the temperature of the primary molded body 60 is lowered to a temperature below the glass transition temperature (Tg).

And, after the second pressing process is finished, by the rotation mechanism 14 The autorotation process is performed once, and the autorotation process rotates the die unit 8 by 90 degrees in the counterclockwise direction. Thereby, the relative angular position of the die unit 8 is changed by 360 degrees with respect to the relative angular position conveyed to the first press chamber 24, that is, returned to the relative angular position of the first press chamber 24.

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the processing chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the die unit 8 is carried into the second slow cooling chamber 32 while being held by the die supporting member 12.

After the mold unit 8 is transferred to the second slow cooling chamber 32, a second slow cooling step is performed. In the second slow cooling chamber 32, the temperature 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 in the second slow cooling chamber 32 and the secondary molded body in the mold unit 8 (the primary molded body after the second pressing step) are slowly cooled. Further, at this time, like the heating chamber 20 and the like, the rotation mechanism 14 continuously rotates the mold unit 8 at 360 degrees during a period of time shorter than the stop time of the turntable 4.

After the predetermined stop time of the turntable 4 has elapsed since the last rotation, the shutter provided between the circumferential end portion of the inner casing 6 and each of the processing chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the mold unit 8 is conveyed to the quenching portion 48 outside the inner casing 6 while being held by the mold supporting member 12.

When the mold unit 8 is transferred to the quenching unit 48, a quenching step is performed. The heater is not provided in the quenching portion 48, and the temperature is the same as that around the device. Therefore, the mold unit 8 is rapidly cooled.

After the previous rotation, the preset turntable 4 has passed. After the stop time, the gate provided between the circumferential end of the inner casing 6 and each of the processing chambers is opened, and the turntable 4 is again rotated at a fixed angle. Thereby, the die unit 8 is conveyed to the exchange part 50 in the state hold|maintained in the mold support member 12.

After the mold unit 8 is transported to the exchange unit 50, an exchange step is performed. When the rotation of the turntable 4 is completed, when the mold unit 8 in which the glass molded body in which the molding process is completed reaches the exchange unit 50, the shutter of the opening 2A of the outer casing 2 is opened. After the shutter of the opening 2A of the outer casing 2 is opened, the mold unit 8 whose molding process is completed is taken out to the outside through the opening 2A. Further, the die unit 8 in which the new glass material 60 is housed is placed on the rotary disk 10 of the turntable 4.

As described above, according to the present embodiment, in the first and second pressing steps, the pressing process is performed a plurality of times (two times), and the mold unit 8 is rotated by the rotation mechanism during the plurality of pressing processes. Rotate so that the relative angular position relative to the transport path changes. Thereby, during the second pressing process, the portions different from the portions facing the heaters 38 and 44 during the first pressing process face the heaters 38 and 44. Thereby, it is prevented that one of the mold units 8 is heated by the heaters 38 and 44 during the pressing process, and the unevenness of the temperature distribution of the mold unit 8 and the glass material accommodated in the mold unit 8 can be eliminated. Further, since the unevenness of the temperature distribution of the glass material is eliminated, the shape defect (astigmatism) generated in the glass molded body can be reduced.

In particular, in the first embodiment and the second pressing step, the relative angular position of the die unit 8 is rotated by 90 degrees or 270 degrees during the first and second pressing processes. Therefore, in the first pressing process, the portion on the side opposite to the conveying path of the die unit 8 facing the heaters 38 and 44 is located in the front and rear direction of the conveying path in the second pressing process. Thereby, it can be eliminated more reliably The temperature of the mold unit 8 and the glass material are not uniform.

Further, in the present embodiment, when the mold unit 8 is transported to the first or second press chambers 24 and 30, the relative angular position with respect to the transport direction and the mold unit 8 are transported to the first or second slow cooling chamber are relative to The relative angular positions of the transport directions are substantially equal. That is, in the first and second pressing steps, the mold unit 8 is rotated exactly one turn (or more). Therefore, all the circumferential surfaces of the mold unit 8 are reliably faced to the heaters 38 and 44 during the pressing process, and the temperature unevenness of the mold unit 8 and the glass material can be more reliably eliminated.

Further, in the present embodiment, the second pressing treatment in the second pressing step is performed until the temperature of the glass material is higher than the glass transition temperature, and the temperature of the glass material is lower than the glass transition temperature. Therefore, the glass material is molded in the pressing process, so that the glass material is not deformed. Thereby, it is possible to further reduce the shape defect (astigmatism) which occurs in the glass molded body.

In addition, the relative angular position of the mold unit 8 of the first and second press processes in the first and second pressing steps and the time of the press processing are not limited to the above-described embodiments, and can be appropriately changed.

Further, in the above-described embodiment, in the rotation processing in the first and second pressing steps, the rotation is performed at a 90-degree counterclockwise direction, but the rotation angle of the rotation processing can be freely set.

Further, in the present embodiment, the first and second pressing steps are performed, but the pressing step may be performed only once. Further, in the present embodiment, the pressing treatment is performed twice in the first and second pressing steps, but the present invention is not limited thereto, and the pressing treatment may be performed three times or more.

Finally, this embodiment is summarized using a diagram or the like.

The method for producing a glass molded body of the present invention is a method for producing a glass molded body by a manufacturing apparatus 1 for a glass molded body, and the apparatus for manufacturing a glass molded body includes a turntable 4 which is provided with a mold of a glass material 60 therein. The unit 8 is transported along a predetermined transport path; the heating chamber 20 is disposed along the transport path to heat the glass material 60; and the first and second press chambers 24 and 30 are pressed against the glass material 60; The first and second slow cooling chambers 26 and 32 are subjected to a slow cooling treatment to the molded body after the completion of the pressing treatment, and the heaters 34, 38, 40, 44 and 46 are provided in the heating chamber 20, the first and second portions. The two sides of the transfer path of the press chambers 24, 30 and the first and second slow cooling chambers 26, 32, wherein the method of manufacturing the glass molded body includes a heating step in which the glass is heated by the heater 34 The material 60 is subjected to heat treatment; in the first and second pressing steps, in the first and second pressing chambers 24, 30, the glass material 60 is heated by the heaters 38, 44, and the glass material 60 is pressed; Cold step, in the first and second slow cooling chambers, by 4 The temperature of the 0, 46 heater is adjusted, and the temperature of the molded body after the completion of the pressing treatment is lowered. In the first and second pressing steps, the glass material 60 is pressed twice as shown in FIGS. 5 and 6 . During each of the two press treatments, the mold unit is rotated to change the relative angular position of the mold unit 8 with respect to the transport path.

Further, the manufacturing apparatus 1 for a glass molded body of the present invention includes a turntable 4 for transporting a mold unit 8 in which a glass material 60 is disposed inside along a predetermined transport path, and a heating chamber 20 along the turntable 4 Providing heat treatment of the glass material 60; first and second pressing chambers 24 and 30 for performing first and second pressing treatments on the glass material; and first and second slow cooling chambers 26 and 32, which are pressed The molded body after the treatment is subjected to a slow cooling treatment; and the heaters 34, 38, 40, 44, and 46 are provided in the heating chamber 20, the first and second pressing chambers 24, 30, and the first and second slowing The manufacturing apparatus of the glass molded body further includes: a rotation mechanism 14 disposed in the first and second pressing chambers for rotating the mold unit 8 to make the mold unit 8 The relative angular position changes with respect to the transport direction.

8‧‧‧Mold unit

14‧‧‧Automatic institutions

47‧‧‧Compression institutions

Claims (13)

A method for producing a glass molded body, which is a method for producing a glass molded body by a manufacturing apparatus of a glass molded body, the apparatus for manufacturing a glass molded body comprising: a conveying mechanism that is disposed along a mold unit in which a glass material is disposed a predetermined transport path transport; a heating chamber provided along the transport path to heat the glass material; a press chamber for pressing the glass material; and a slow cooling chamber to which the pressing treatment is performed The molded body is subjected to a slow cooling treatment; and a heater is disposed on both sides of the transport path of the heating chamber, the press chamber, and the slow cooling chamber, wherein the method for manufacturing the glass molded body includes a heating step in the heating chamber a heat treatment of the glass material by the heater; a pressing step of heating the glass material by the heater in the pressing chamber, and pressing the glass material; and a slow cooling step in the slow cooling In the chamber, the temperature is adjusted by the heater, and the molded body after the pressing treatment is performed. The temperature is decreased. In the pressing step, the glass material is subjected to a plurality of pressing treatments, and the mold unit is rotated during each of the plurality of pressing treatments to make the relative angle of the mold unit relative to the conveying path. The position changes. For example, the method for manufacturing a glass molded body according to claim 1 of the patent scope, wherein The press chamber includes a first press chamber that is disposed between the heating chamber and the slow cooling chamber along the transport path, and a second press chamber that is disposed downstream of the transport path with respect to the slow cooling chamber On the side, 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. The method for producing a glass molded body according to the second aspect of the invention, wherein the second pressing step is performed while the glass material is slowly cooled, and the temperature of the glass material is higher than a glass transition temperature. The temperature to the above glass material is lower than the glass transition temperature. The method for producing a glass molded body according to claim 2, wherein in the second pressing step, the glass material is subjected to a plurality of press treatments, and the first press treatment is performed by converting the glass material to a temperature ratio of glass. The second pressing treatment is performed in a state where the temperature of the glass material is higher than the glass transition temperature, and the temperature of the glass material is lower than the glass transition temperature. The method for producing a glass molded body according to claim 4, wherein in the second pressing step, the pressing treatment is performed twice, and the first pressing treatment in the second pressing step is carried out by the mold unit and the above The second pressing chamber is performed in a state in which the initial relative angular positions of the transport directions are equal. The second pressing process in the second pressing step is rotated in either the clockwise direction or the 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 state of the relative angular position of 90 degrees is performed. The method for producing a glass molded body according to any one of the invention, wherein the relative angular position of the mold unit with respect to the transport direction when the mold unit is transported into the press chamber and the mold unit are transported to the slow cooling chamber The relative angular positions with respect to the above-described transport direction are substantially equal. The method for producing a glass molded body according to the second aspect of the invention, wherein in the first pressing step, the pressing process is performed twice, and the first pressing process of the first pressing step is carried out by the die unit In the first pressing chamber, the initial relative angular position in the transport direction and the relative angular position of 270 degrees in either the clockwise direction or the counterclockwise direction are performed, and the second pressing step of the first pressing step is performed. The processing is performed in a state where the above-described mold unit is located at the same relative angular position as the initial relative angular position described above. The method for producing a glass molded body according to claim 1, wherein the transfer mechanism includes a turntable, and the heating chamber, the press chamber, and the slow cooling chamber are circumferentially arranged on the turntable. The method of manufacturing a glass molded body according to the first aspect of the invention, wherein the mold unit comprises: a molding die having a molding surface corresponding to a shape of the glass molding; and a mold supporting member for maintaining the molding Mold. A manufacturing device for a glass molded body, comprising: a conveying mechanism for conveying a mold unit in which a glass material is disposed inside along a predetermined conveying path; the heating chamber is provided along the conveying path to heat the glass material; and the pressing chamber is opposite to the above The glass material is subjected to a pressing treatment; and a slow cooling chamber which performs a slow cooling treatment on the molded body having the above-mentioned pressing treatment; and a heater which is disposed on both sides of the above-mentioned conveying path of the heating chamber, the pressing chamber and the slow cooling chamber, wherein Further, the apparatus for manufacturing a glass molded body further includes: a rotation mechanism provided in the press chamber for rotating the mold unit to change a relative angular position of the mold unit with respect to the conveyance direction. The apparatus for manufacturing a glass molded body according to claim 10, wherein the press chamber includes: a first press chamber disposed between the heating chamber and the slow cooling chamber along the transport path; and a second press The chamber is disposed on a downstream side of the transfer path with respect to the slow cooling chamber. The apparatus for manufacturing a glass molded body according to claim 10, wherein the transfer mechanism includes a turntable, and the heating chamber, the press chamber, and the slow cooling chamber are circumferentially disposed on the turntable. The apparatus for manufacturing a glass molded body according to claim 10, wherein the mold unit has a molding die having a shape corresponding to the shape of the glass molded body. And a mold supporting member for holding the above-mentioned molding die.