JP2014162669A - Manufacturing method of glass molding and manufacturing apparatus of glass molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a glass molding that suppresses a defect of shape (astigmatisms) resulting from an ununiformity of temperature distribution of a molding unit and a glass material during press processing.SOLUTION: A manufacturing apparatus of a glass molding 1 comprises: a rotating mechanism 14 provided in each processing chamber other than a press chamber for rotating a mold unit intermittently; and a control unit 15 for controlling a stop angular position and a stop time in the stop angular position of the rotating mechanism 14, in which the mold unit is rotated by the rotating mechanism 14 intermittently at least one of a gradual cooling step and a heating step, and in which the control unit 15 controls the rotating mechanism 14 so that the stopping time during which the mold unit is stopped at a relative angular position different from an initial relative angular position relative to a transfer path just after the mold unit has brought into each processing chamber is longer than the stopping time during which the mold unit is stopped at the initial relative angular position.

Description

  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 a manufacturing apparatus of such a glass molded body, for example, a heating unit, a press chamber, and a slow cooling chamber are arranged in an arc shape, and a mold unit in which a glass material is arranged inside a mold by a turntable, An apparatus for manufacturing a glass molded body is disclosed in which a glass material is subjected to heat treatment, press treatment, and slow cooling treatment while sequentially transporting the heating chamber, press chamber, and slow cooling chamber.

  In such a manufacturing apparatus, heaters are provided on both sides of the conveyance path of the mold unit of 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 mold unit and the glass material disposed in the interior thereof. The temperature 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 1 (Japanese Patent Application 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 is disclosed in which an autorotation means is provided, and when the mold unit is heated in the heating chamber, the mold unit is intermittently rotated at regular intervals of 90 degrees. According to the apparatus disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2012-12235), a mold generated in the heating chamber due to the arrangement of the heater by intermittently rotating the mold unit in the heating chamber. The nonuniformity of the temperature distribution of the unit and the glass material can be suppressed.

JP 2012-12235 A

  However, in the apparatus described in Patent Document 1 (Japanese Patent Laid-Open No. 2012-12235), the mold unit cannot be rotated during the press process. For this reason, although the nonuniformity of the temperature distribution of the mold unit and the glass material in the heating chamber can be suppressed, the nonuniformity of the temperature distribution occurs in the mold unit and the glass material during the pressing process. For this reason, there has been a problem that a molded lens still has a shape defect (as).

  This invention is made | formed in view of said problem, and is suppressing generation | occurrence | production of the shape defect (asp) resulting from the nonuniformity of the temperature distribution of the die unit and glass material which arises during a press process.

  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 to the glass material, a heater provided on both sides of the heating chamber, the press chamber, and the slow cooling chamber, A glass molded body manufacturing apparatus comprising: a glass molded body manufacturing apparatus comprising: a glass molded body manufacturing apparatus provided in at least one of a slow cooling chamber or a heating chamber; A rotation mechanism that rotates, a control unit that controls a stop angle position of the rotation mechanism and a stop time at the stop angle position, a heating step of performing a heat treatment on the glass material with a heater in the heating chamber, A press step for pressing the glass material while heating the glass material with a heater in the chamber; and a slow cooling step for lowering the temperature of the molded body that has been pressed with the heater while controlling the temperature in the slow cooling chamber. And at least one of the slow cooling step or the heating step, the mold unit is intermittently rotated by the rotation mechanism, and the control unit is immediately after the mold unit is carried into at least one of the slow cooling chamber or the heating chamber. The rotation mechanism is controlled so that the stop time in which the mold unit is stopped at a relative angle position different from the initial relative angle position is longer than the stop time in which the mold unit is stopped at the initial relative angle position with respect to the transfer path.

  Moreover, the manufacturing apparatus of the glass molded body of this invention is the glass material provided along the conveyance mechanism and the conveyance path | route which convey the die unit by which the glass material is arrange | positioned inside along a predetermined conveyance path | route. A heating chamber for performing heat treatment, a press chamber for performing press processing on a glass material, a slow cooling chamber for performing slow cooling processing on a molded body, and a heating chamber, a press chamber, and a cooling chamber provided on both sides of a conveyance path of the slow cooling chamber. A glass molded body manufacturing apparatus comprising a heater, and the glass molded body manufacturing apparatus is provided in at least one of the slow cooling chamber or the heating chamber and intermittently rotates the mold unit. And a control unit that controls the stop angle position of the rotation mechanism and the staying time at the stop angle position, the control unit immediately after the mold unit is carried into at least one of the slow cooling chamber or the heating chamber. First to transport route Than downtime stopped in the relative angular position, so that downtime mold unit has stopped at a relative angular position different from the initial relative angular position is long, and controls the rotation mechanism.

  According to the present invention, in at least one of the slow cooling chamber or the heating chamber, the portions located on both sides in the transport direction in the press step of the mold unit are compared with the portions located in the front and rear in the transport direction in the press step. Then, a larger amount of heat is received from at least one heater of the slow cooling chamber or the heating chamber. For this reason, it is possible to suppress unevenness in the temperature distribution of the mold unit and the glass material in the mold unit, which occurs in the pressing step and the slow cooling step.

In the present application, the “heating chamber” is not only a chamber for heating the mold unit in which the glass material is stored before the press treatment to a predetermined temperature, but also the glass material thus heated. It also includes a chamber for soaking the mold unit at a predetermined temperature.
Further, in the present application, “spinning” means that the mold unit rotates around the central axis of the mold unit.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the shape defect (asp) resulting from the nonuniformity of the temperature distribution of the metal mold unit and glass material which arises during a press process can be suppressed.

It is a horizontal sectional view showing composition of a manufacturing device of a lens fabrication object of this embodiment. It is II-II sectional drawing in FIG. FIG. 3 is a vertical sectional view of the mold unit taken along the line III-III in FIG. 1. It is a vertical sectional view of a mold unit. It is a figure which shows the ratio of the stop time in each angular position in each pattern assumed in order to determine the drive timing of the autorotation mechanism in each chamber other than a press chamber. It is a graph which shows the relationship between the ratio of the time when a metal mold unit has stopped at 90 degrees or 270 degrees with respect to the initial angle position, and asses which arise in a glass fabrication object (lens). 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. .

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in a figure, and the description is not repeated.
FIG. 1 is a horizontal sectional view showing the configuration of the lens molded body manufacturing apparatus of the present embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. FIG. 4 is a vertical sectional view of the mold unit.
As shown in FIGS. 1 to 3, the lens molded body manufacturing apparatus 1 according to the present embodiment includes an outer casing 2 formed in a substantially cylindrical shape, a 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 concentrically and coaxially.

  The outer casing 2 has a substantially cylindrical space defined therein, and an opening 2A for carrying in and out the mold unit 8 is formed in a part of the side surface thereof. 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 10 </ b> A has a smaller diameter than the bottom portion 12 </ b> A of the mold support member 12 constituting the mold unit 8 and a larger diameter than the rotating shaft 14 </ b> A of the rotation mechanism 14. The mold unit 8 is disposed on the opening 10 </ b> 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.

  Further, the turntable 4 stops for a predetermined time set in advance during each rotation operation. In this stopped state, the opening 10 </ b> A formed in the turntable 10 is located immediately above the rotation mechanism 14 provided in each processing chamber. The stop time of the turntable 4 is determined to be longer than the time required for the press process in the press chamber 26.

  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 an angular range of a certain angle in the rotation direction of the turntable 4. These seven chambers are arranged along the conveyance path of the mold unit 8 by the first rapid heating chamber 20, the second rapid heating chamber 22, the soaking chamber 24, the press chamber 26, the first annealing chamber 28, and the second annealing chamber. The cold room 30 and the third slow cooling room 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 first rapid heating chamber 20, the second rapid heating chamber 22, the soaking chamber 24, the press chamber 26, the first annealing chamber 28, the second annealing chamber 30, and the third annealing chamber 32 are each provided with a heater. 34, 36, 38, 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 the first rapid heating chamber 20, the second rapid heating chamber 22, and the soaking temperature, respectively. The chamber 24, the press chamber 26, the first slow cooling chamber 28, the second slow cooling chamber 30, and the third slow cooling chamber 32 are heated to a predetermined temperature.

  As shown in FIG. 3, a press mechanism 47 is provided above the press chamber 26 of the outer casing 2. 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 47 </ b> B of the actuator 47 </ b> A passes through the openings of the ceiling portions 2 </ b> C and 6 </ b> C of the outer casing 2 and the inner casing 6, and the lower ends reach the insides of the first and second press chambers 24 and 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.

  Further, below the first rapid heating chamber 20, the second rapid heating chamber 22, the soaking chamber 24, the first annealing chamber 28, the second annealing chamber 30, and the third annealing chamber 32, respectively, A rotation mechanism 14 that rotates the mold unit 8 in the room is provided. As shown in FIG. 2, the autorotation mechanism 14 is provided at 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 tip of the rotation shaft 14A. 14C. The rotation mechanism 14 in each chamber is connected to the control unit 15, and the control unit 15 can control the start, stop, and rotation speed of the rotation drive mechanism 14 </ b> B.

  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 </ b> A is retracted until the support portion 14 </ b> C becomes lower than the turntable 10 is referred to as a standby state of the rotation mechanism 14.

  When the mold unit 8 is rotated by the rotation mechanism 14, first, the rotating shaft 14A is extended, and the mold unit 8 placed on the turntable 4 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 </ b> 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. Then, the rotating shaft 14A is retracted again to return to the standby state.

  When the turntable 4 is in a stopped state, that is, the control unit 15, that is, each processing chamber other than the press chamber 26 (that is, the first rapid heating chamber 20, the second rapid heating chamber 22, the soaking chamber 24, the first slow heating chamber 24 While the mold unit 8 is being processed in the cold chamber 28, the second slow cooling chamber 30, and the third slow cooling chamber 32), the mold unit 8 rotates so as to stop at a predetermined stop angle position. The rotation of the mechanism 14 is controlled.

  Furthermore, the control unit 15 controls the timing at which the rotation mechanism 14 rotates four times by 90 degrees, that is, the stop time at the stop angle position. In the present embodiment, the control unit 15 sets the timing at which the rotation mechanism 14 rotates so as to cancel the uneven temperature of the mold unit 8 and the glass material 60 accommodated therein during the press process in the press chamber 26. Control.

  As shown in FIG. 1, a quenching section 48 and an exchange section 50 are formed between the third annealing chamber 32 and the rapid 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 transported from the second slow cooling chamber 32, and no heater is disposed around the mold unit 8, and the temperature is substantially the same as the outside of the apparatus. In addition, the exchange unit 50 has a mold unit 8 in which a glass molded body that has been molded is accommodated through an opening 2A of the outer casing 2, and a mold unit 8 in which a new glass material that has not been molded is accommodated. It is an area for exchanging.

  As shown in FIG. 4, 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.

  Here, in the glass molded body manufacturing apparatus 1 described above, the surfaces on both sides of the mold unit 8 face the heater 40 from the start to the end of the pressing process in the press chamber 26, and the front and rear The surface does not face the heater 40. For this reason, both side portions of the mold unit 8 receive more radiant heat from the heater than the front portion and the rear portion.

  On the other hand, in the present embodiment, the control unit 15 makes the relative difference between the mold unit 8 and the initial relative angular position longer than the stop time in which the mold unit 8 is stopped at the initial relative angular position in each processing chamber. The rotation mechanism 14 is controlled so that the stop time stopped at the angular position becomes longer.

  Specifically, the control unit 15 intermittently rotates the mold unit 8 four times by 90 degrees each time from when the rotation mechanism 14 is loaded into each processing chamber to when it is unloaded from each processing chamber. To control. As a result, the relative angular position (hereinafter referred to as the initial relative angular position) with respect to the transfer path immediately after the mold unit 8 is carried into each processing chamber and the mold unit 8 immediately before the mold unit 8 is carried out from each processing chamber. The relative angular position relative to the transport path is equal.

  Furthermore, the control unit 15 determines the timing of these four rotations from the time when the mold unit 8 stops at the initial relative angular position or the relative angular position rotated 180 degrees with respect to the initial relative angular position. The rotation mechanism 14 is controlled so that the time during which the mold unit 8 is stopped at the relative angular position of 90 degrees or 270 degrees becomes long.

  As a result, in each processing chamber other than the press chamber 26, the portion of the mold unit 8 that does not face the heater 40 in the press step is compared with the portion of the chamber that faces the heater 40 in the press step. 34, 36, 38, 42, 44, 46 will receive more heat. Therefore, nonuniformity of the temperature distribution of the mold unit 8 and the glass material 60 in the mold unit 8 generated in the pressing step can be suppressed.

  Furthermore, as will be described below, by determining the drive timing of the rotation mechanism 14 in each chamber other than the press chamber 26, it is possible to more efficiently suppress the occurrence of uneven temperature distribution of the glass material 60.

  FIG. 5 is a diagram showing the ratio of the stop time at each angular position in each pattern assumed to determine the drive timing of the rotation mechanism in each chamber other than the press chamber 26. The rotation mechanism 14 in each chamber other than the press chamber 26 of the glass molded body manufacturing apparatus 1 of the present embodiment rotates intermittently every 90 degrees. Therefore, as shown in FIG. 5, the initial angular position is the angular position of the mold unit 8 immediately after being transferred to each chamber, and the stay time from when the mold unit is loaded into each chamber until it is unloaded is shown. Thus, the percentage of time that the mold unit 8 is stopped at 90 degrees or 270 degrees counterclockwise with respect to this initial angular position is 0%, 40%, 60%, 80%, 85%, and 100 %, Glass molded bodies (lenses) were produced, and the occurrence of asses was observed in each case. In the present embodiment, the time when the mold unit 8 is stopped at 90 degrees with respect to the initial angular position is equal to the time when the mold unit 8 is stopped at 270 degrees, and the mold unit 8 is The control unit 15 controls the rotation mechanism 14 so that the time of stopping at 0 degrees with respect to the initial angular position is equal to the time of stopping at 180 degrees.

FIG. 6 is a graph showing the relationship between the ratio of the time during which the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial angular position, and the asses generated in the glass molded body (lens). The vertical axis in the graph represents the time when the mold unit is stopped at 90 degrees or 270 degrees, and the ratio of the time when the mold unit stays in each processing chamber (referred to as 90 ° (270 °) stop time ratio) is 50. % Indicates the ratio of the number of asses generated by normalization with the number of asses generated at the time of%.
As shown in the figure, when the 90 ° (270 °) stop time ratio is smaller than 50%, the asphalt generation ratio exceeds 1. On the other hand, when the 90 ° (270 °) stop time ratio is increased to 50% or more, the asphalt generation ratio is reduced to 1 or less. When the 90 ° (270 °) stop time ratio is 60%, the ass generation ratio is 0.75. When the 90 ° (270 °) stop time ratio is 85%, the ass generation ratio is 0. .65. Further, when the 90 ° (270 °) stop time ratio is increased from 85%, the ass generation ratio increases. When the 90 ° (270 °) stop time ratio is 95%, the ass generation ratio is 1 It becomes.

  Thus, when the 90 ° (270 °) stop time ratio is 50% or more and 95% or less, the asphalt generation ratio is 1 or less. Furthermore, by setting the 90 ° (270 °) stop time ratio to 60% or more and 85% or less, the generation ratio of asphalt can be suppressed to 0.65 to 0.75.

  Therefore, the time during which the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial angular position is 50% or more and 95% or less of the time during which the mold unit stays in each processing chamber. It is preferable to do. Further, it is preferable to set the mold unit to 60% or more and 85% or less of the time during which the mold unit stays in each processing chamber.

  Hereinafter, a method for 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.

  FIG. 7 is a graph showing a temperature change of the glass material (glass molded body) 60 in each process for glass molding in the method for producing a glass molded body of the present embodiment, where the horizontal axis represents time, and the vertical axis represents time. Indicates temperature.

  First, 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 a preset stop time (hereinafter referred to as tact 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. As a result, the turntable 4 rotates by a certain angle counterclockwise in plan view. The tact time is substantially equal to the time from when the mold unit 8 is loaded into each chamber until it is unloaded. Accordingly, the mold unit 8 is conveyed into the first rapid heating chamber 20 while being held by the mold support member 12. At this time, since the mold support member 12 passes through the slit 6E provided at the bottom of the inner casing 6, the mold support member 12 and the inner casing 6 do not interfere with each other.

  When the mold unit 8 is transported to the first rapid heating chamber 20, a first rapid heating step for rapidly heating the mold unit 8 is performed. The inside of the first rapid 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 transfer path. Then, the mold unit 8 transferred to the first rapid heating chamber 20 is heated by the heaters 34 provided on both sides of the transfer path.

In the first rapid heating step, the mold unit 8 is rotated by the rotation mechanism 14 as described below while the mold unit 8 is heated by the heater 34.
That is, when the mold unit 8 is transported to the first rapid heating chamber 20, the rotation mechanism 14 rotates the mold unit 8 90 degrees counterclockwise in plan view. As a result, the mold unit 8 rotates 90 degrees with respect to the relative angular position immediately after being transferred to the first rapid heating chamber 20. Then, the rotation mechanism 14 stops until the die unit 8 has elapsed 42.5% of the stop time (hereinafter referred to as tact time) of the turntable 4 set in the first rapid heating chamber 20 in advance. .

  Then, when 42.5% of the time staying in the first rapid heating chamber 20 has elapsed, the rotation mechanism 14 again rotates the mold unit 8 90 degrees counterclockwise in plan view. As a result, the mold unit 8 rotates 180 degrees with respect to the relative angular position immediately after being transferred to the first rapid heating chamber 20. In this state, the rotation mechanism 14 stops until 7.5% of the tact time has elapsed.

  When the rotation mechanism 14 stops for 7.5% of the tact time, the mold unit 8 rotates 90 degrees counterclockwise again in plan view. As a result, the mold unit 8 is rotated 270 degrees with respect to the relative angular position immediately after being transferred to the first rapid heating chamber 20. Then, the rotation mechanism 14 stops until the mold unit 8 has reached 42.5% of the tact time.

  When the rotation mechanism 14 stops for 42.5% of the tact time, the mold unit 8 rotates 90 degrees counterclockwise again in plan view. Thereby, the mold unit 8 returns to a state equal to the relative angular position immediately after being transferred to the first rapid heating chamber 20. In this state, the rotation mechanism 14 stops until 7.5% of the tact time has elapsed.

  After 7.5% of the tact time has elapsed after the mold unit 8 is rotated to a state equal to the relative angular position immediately after being transferred to the first rapid heating chamber 20 by the rotation mechanism 14, A shutter provided between the circumferential end and each chamber is opened, and the turntable 4 rotates counterclockwise by a certain angle in plan view. Thereby, the mold unit 8 is conveyed into the second rapid heating chamber 22 while being held by the mold support member 12. When the rotation mechanism 14 rotates the mold unit 8 at the timing as described above, the time when the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial angular position is 1 It will be 85% of the time spent in the rapid heating chamber 20.

  When a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is rotated counterclockwise in plan view. Rotate a certain angle. Thereby, the mold unit 8 is conveyed into the second rapid heating chamber 22 while being held by the mold support member 12.

  When the mold unit 8 is transported to the second rapid heating chamber 22, a second rapid heating step is performed in which the mold unit 8 is rapidly heated to a glass yield point temperature (Ts). The soaking chamber 22 is maintained at a temperature equal to or higher than the glass yield point temperature (Ts) by the heater 36. Thereby, the glass material 60 in the mold unit 8 conveyed into the second rapid heating chamber 22 is heated until reaching the glass yield point temperature (Ts).

  In parallel with this, similarly to the first rapid heating chamber 20, the control unit 15 performs an operation of intermittently rotating the mold unit 8 counterclockwise by 90 degrees at a predetermined timing in plan view. The rotation mechanism 14 directly under the second rapid heating chamber 22 is controlled. That is, the control unit 15 is configured so that the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial relative angular position in the second rapid heating chamber 22 as in the first rapid heating chamber 20. The rotation mechanism 14 is controlled to be 85% of the tact time.

  When a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is rotated counterclockwise in plan view. Rotate a certain angle. As a result, the mold unit 8 is conveyed into the soaking chamber 24 while being held by the mold support member 12.

  When the mold unit 8 is transported to the soaking chamber 24, a soaking step for soaking the mold unit 8 and the glass material 60 accommodated therein is performed. The inside of the soaking chamber 24 is kept at the glass yield point temperature (Ts) by the heater 38. As a result, the mold unit 8 and the glass material 60 in the mold unit 8 are soaked so that the temperature has a uniform temperature distribution at the glass yield point temperature (Ts).

  In addition, in the soaking chamber 24, the control unit 15 also determines the time during which the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial relative angular position, as in the first rapid heating chamber 20. The rotation mechanism 14 is controlled to be 85% of the time.

  When a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is rotated counterclockwise in plan view. Rotate a certain angle. Accordingly, the mold unit 8 is conveyed into the press chamber 26 while being held by the mold support member 12.

  When the mold unit 8 is conveyed to the press chamber 26, a press step is performed. In the pressing step, the mold unit 8 is pressed by the press mechanism 47 while the mold unit 8 is heated by the heater 42 so as to maintain the glass yield point temperature (Ts). At this time, since the heaters 42 are provided on both sides of the conveyance path, the portions on both sides of the conveyance path of the mold unit 8 are heated as compared with the front and back portions of the conveyance path. However, as described above, in the first rapid heating chamber 20, the second rapid heating chamber 22, and the soaking chamber 24, the time during which the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial relative angular position. However, since it is rotated by the rotation mechanism 14 so as to be longer than the time at which it is stopped at the initial relative angular position, it is possible to suppress uneven temperature distribution occurring in the mold unit 8 and the glass material 60.

  When the press step is completed and the tact time has elapsed since the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 is viewed in plan view. Rotate a certain angle counterclockwise. Thereby, the mold unit 8 is conveyed into the first slow cooling chamber 28 while being held by the mold support member 12.

  In the first slow cooling chamber 28, a first slow cooling step for slowly cooling the mold unit 8 is performed while heating the mold unit 8 with the heater 42. Also in the first slow cooling chamber 28, the control unit 15, like the first rapid heating chamber 20, is the time during which the mold unit 8 is stopped at 90 degrees or 270 degrees with respect to the initial angular position, The rotation mechanism 14 is controlled to be 85% of the time during which the mold unit 8 stays in the first slow cooling chamber 28.

  When the first slow cooling step is completed and a preset tact time has elapsed 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 a certain angle counterclockwise in plan view. Thereby, the mold unit 8 is conveyed into the second slow cooling chamber 30 while being held by the mold support member 12.

  In the second slow cooling chamber 30, a second slow cooling step for slowly cooling the mold unit 8 is performed while heating the mold unit 8 with the heater 44. The inside of the second slow cooling chamber 32 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 44 provided on both sides of the conveyance path. And also in the 2nd slow cooling chamber 30, like the 1st rapid heating chamber 20, the control part 15 is the time when the mold unit 8 has stopped at 90 degrees or 270 degrees with respect to the initial angle position, The rotation mechanism 14 is controlled so as to be 85% of the time during which the mold unit 8 stays in the second slow cooling chamber 30. As a result, the glass molded body (glass material for which press processing has been completed) 60 in the mold unit 8 is soaked at a temperature (Tg + 10 ° C.) 10 ° C. higher than the glass transition temperature.

  When the tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each chamber is opened, and the turntable 4 rotates counterclockwise by a predetermined angle in plan view. . Thereby, the mold unit 8 is conveyed from the second annealing chamber 30 into the third annealing chamber 32 while being held by the mold support member 12.

  When the mold unit 8 is transported to the third slow cooling chamber 32, a third slow cooling step for further cooling the mold unit 8 is performed. The inside of the third slow cooling chamber 32 is kept at a temperature sufficiently lower than the glass transition temperature (Tg) by the heaters 46 provided on both sides of the transport path.

  And also in the 3rd slow cooling chamber 32, like the 1st rapid heating chamber 20, the control part 15 has the time which the mold unit 8 has stopped at 90 degree | times or 270 degree | times with respect to the initial angle position, The rotation mechanism 14 is controlled so as to be 85% of the time during which the mold unit 8 stays in the third slow cooling chamber 32. Thereby, the glass molded object (glass material in which press processing was completed) 60 in the mold unit 8 is cooled to a temperature sufficiently lower than the glass transition temperature (Tg).

  When the tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each processing chamber is opened, and the turntable 4 rotates by a certain angle. 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 unit 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 and the internal glass molded body 60 are rapidly cooled. In addition, although the auto-rotation mechanism 14 is not provided in the rapid cooling part 48, this is because the temperature of the glass forming body 60 is cooled to a temperature sufficiently lower than the glass transition temperature (Tg) in the third slow cooling chamber 32. This is because the glass molded body 60 is less likely to be deformed at the rapid cooling portion 48 because it is solidified.

  Further, when a preset tact time elapses from the previous rotation of the turntable 4, the shutter provided between the circumferential end of the inner casing 6 and each processing chamber is opened, and the turntable 4 rotates at a constant 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.
The manufacturing of the glass molded body 60 is completed through the above steps.

  As in this embodiment, in the glass molded body manufacturing apparatus 1 in which the heaters 34, 36, 38, 40, 42, 44, 46 are provided on both sides of the conveyance path, heating is performed from both sides of the mold unit 8. Therefore, the heat received from the heaters 34, 36, 38, 40, 42, 44, 46 varies depending on the portion of the mold unit 8, and temperature distribution tends to occur on the surface of the mold unit 8. On the other hand, in this embodiment, the control unit 15 causes the mold unit 8 to move relative to the initial relative angular position in each processing chamber, rather than the stop time in which the mold unit 8 stops at the initial relative angular position. Thus, the rotation mechanism 14 is controlled so that the stop time at 90 degrees or 270 degrees is long. For this reason, after the part located in the both sides of a conveyance direction in the 1st rapid heating chamber 20, the 2nd rapid heating chamber 22, and the soaking | uniform-heating chamber 24 is heated, the die unit 8 is rotated by the rotation mechanism 14, and a press is carried out. It is carried into the chamber 26. As a result, a portion of the mold unit 8 that is different from the portion facing the heaters 34, 36, 38 in the immediately preceding processing chamber (the first rapid heating chamber 20, the second rapid heating chamber 22, and the soaking chamber 24) is pressed. It arrange | positions so that the heater 40 arrange | positioned in the chamber 26 may be opposed for a long time. That is, the relative positions of the mold unit 8 with respect to the heaters 34, 36, 38, and 40 in the immediately preceding processing chamber (the first rapid heating chamber 20, the second rapid heating chamber 22, and the soaking chamber 24) and the press chamber 26. By adopting a configuration in which the mold unit 8 is rotated so as to change the temperature, nonuniformity of the temperature distribution of the mold unit 8 and the glass material 60 in the mold unit 8 in the pressing step can be suppressed. A glass molded body can be produced.

  Furthermore, in this embodiment, after the part located in the both sides of a conveyance direction in the press chamber 26 is heated, in the 1st slow cooling chamber 28, the 2nd slow cooling chamber 30, and the 3rd slow cooling chamber 32, a press chamber 26, a portion different from the portion facing the heater 40 faces the heaters 42, 44, 46 disposed in the first slow cooling chamber 28, the second slow cooling chamber 30, and the third slow cooling chamber 32 for a long time. To be arranged. That is, the relative positions of the mold unit 8 with respect to the heaters 40, 42, 44, 46 in the press chamber 26, the first slow cooling chamber 28, the second slow cooling chamber 30, and the third slow cooling chamber 32 are changed. Thus, even if temperature distribution non-uniformity occurs in a few press steps, the temperature distribution of the glass unit 60 in the mold unit 8 and the mold unit 8 is not uniform. Slow cooling can be performed in a state where uniformity is suppressed, and a high-quality glass molded body can be produced.

  In the present embodiment, the control unit 15 controls the rotation mechanism 14 so that the mold unit 8 stops at a relative angular position where the mold unit 8 rotates 90 degrees or 270 degrees from the initial relative angular position. The portion that is difficult to receive the radiant heat from the heater 40 receives the most radiant heat from the heater in other steps, and more efficiently suppresses the uneven temperature distribution of the mold unit 8 and the glass material 60 in the mold unit 8. can do.

  Further, in the present embodiment, the stop time, which is the relative angular position where the mold unit 8 rotates 90 degrees from the initial relative angular position, and the relative angular position where the mold unit 8 rotates 270 degrees from the initial relative angular position with respect to the tact time. The ratio of the total stop time is 60% or more and 85% or less. As a result, the non-uniform temperature distribution in the mold unit 8 and the glass material 60 is caused by the stop time being the relative angular position rotated 90 degrees or 270 degrees from the initial relative angular position in the processing chamber other than the press chamber 26 being too long. Can be prevented.

  In the present embodiment, in each processing chamber 20, 22, 24, 28, 30, 32 other than the press chamber 26, the stop angle position of the rotation mechanism 14 and the stop time at the stop angle position are controlled. If the rotation of the rotation mechanism is controlled in at least one chamber, it is possible to prevent the temperature distribution in the mold unit 8 and the glass material 60 from becoming uneven. However, in this case, it is desirable to control the rotation of the rotation mechanism in the slow cooling chamber.

  In the present embodiment, the rotation of the rotation mechanism is similarly controlled in each of the processing chambers 20, 22, 24, 28, 30, and 32 other than the press chamber 26. The stop angle position and the stop time at the stop angle position may be changed.

  In the present embodiment, the mold unit 8 is rotated by 90 degrees. However, the present invention is not limited to this, and for example, the mold unit 8 may be rotated by 60 degrees or 45 degrees. Even in such a case, it is desirable that the angular position at which the mold unit is carried out of each processing chamber is the same as the carried-in initial relative angular position.

  In the present embodiment, the first rapid heating chamber 20, the second rapid heating chamber 22, the soaking chamber 24, the press chamber 26, the first annealing chamber 28, the second annealing chamber 30, and the third annealing chamber. Although the manufacturing apparatus 1 of the glass forming body provided with 32 is demonstrated as an example, it is not restricted to this, The apparatus provided with two or more press chambers, or only one chamber is equipped with a slow cooling chamber or a rapid heating chamber. The present invention can be applied even to such an apparatus. That is, the present invention can be applied to any apparatus provided with a heating chamber that heats the mold unit, a press chamber that performs press processing on the mold unit, and a cooling chamber that cools the mold unit.

The present invention will be summarized below with reference to the drawings.
As shown in FIG. 1, the method for producing a glass molded body of the present invention includes a turntable 4 that conveys a mold unit 8 in which a glass material is disposed along a predetermined conveyance path, and the turntable 4. The rapid heating chambers 20 and 22 and the soaking chamber 24 for performing heat treatment on the glass material provided, the press chamber 26 for performing press treatment on the glass material, and the first to third slow cooling for performing slow cooling treatment on the glass material. Chambers 28, 30, 32, and heaters 34, 36, 38, 40, 42, 44, 46 provided on both sides of the transfer path of these processing chambers 20, 22, 24, 26, 28, 30, 32. The glass molded body manufacturing apparatus 1 is a method for manufacturing a glass molded body, and the glass molded body manufacturing apparatus 1 is provided in each processing chamber other than the press chamber 26 and is intermittently used in the mold unit 8. Rotation mechanism 14 for rotating A control unit 15 that controls the stop angle position of the rotation mechanism 14 and the stop time at the stop angle position, and a heating step of performing heat treatment on the glass material by the heaters 34 and 36 in the rapid heating chambers 20 and 22; In the press chamber 26, the glass material is heated by the heater 40 while pressing the glass material, and in the first to third annealing chambers 28, 30, 32, the press is performed by the heaters 42, 44, 46. A slow cooling step of lowering the temperature of the completed molded body while controlling, and intermittently rotating the mold unit 8 in at least one of the slow cooling step or the heating step. 8 is less than the stop time at which the mold unit is stopped at the initial relative angular position with respect to the transfer path immediately after being loaded into each processing chamber. As downtime stopped in the relative angular position different from the angular position becomes longer, and controls the rotation mechanism 14.

  Further, as shown in FIG. 1, the glass molded body manufacturing apparatus 1 of the present invention includes a turntable 4 that transports a mold unit 8 in which a glass material is disposed along a predetermined transport path, and a turntable. 4, the rapid heating chambers 20 and 22 and the soaking chamber 24 for performing the heat treatment on the glass material, the press chamber 26 for performing the press treatment on the glass material, and the first to the first performing the slow cooling treatment on the glass material. 3 Slow cooling chambers 28, 30, 32 and heaters 34, 36, 38, 40, 42, 44, 46 provided on both sides of the transfer path of these processing chambers 20, 22, 24, 26, 28, 30, 32 Further, the glass molded body manufacturing apparatus 1 is provided in a processing chamber other than the press chamber 26 and intermittently rotates the mold unit 8. And stop of the rotation mechanism 14 And a control unit 15 for controlling the stay time at the degree position and the stop angle position. The control unit 15 stops at the initial relative angle position with respect to the transfer path immediately after the mold unit 8 is loaded into each processing chamber. The rotation mechanism 14 is controlled so that the stop time during which the mold unit is stopped at a relative angle position different from the initial relative angle position is longer than the stop time that is present.

DESCRIPTION OF SYMBOLS 1 Glass molding manufacturing apparatus 2 Outer casing 4 Turntable 6 Inner casing 8 Mold unit 10 Turntable 12 Mold support member 14 Rotating mechanism 15 Control unit 20 First rapid heating chamber 22 Second rapid heating chamber 24 Soaking chamber 26 Press chamber 28 First annealing chamber 30 Second annealing chamber 32 Third 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 54 Upper mold 56 Lower mold 58 Same mold 60 Glass material (glass molding)

Claims (11)

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 glass material;
A heater formed on both sides of the conveying path of the heating chamber, the press chamber, and the slow cooling chamber, and a method of manufacturing a glass molded body with a glass molded body manufacturing apparatus comprising:
The glass molded body manufacturing apparatus is provided in at least one of the slow cooling chamber or the heating chamber, and a rotation mechanism for intermittently rotating the mold unit,
A control unit that controls a stop angle position of the autorotation mechanism and a stop time at the stop angle position, and
In the heating chamber, a heating step of performing a heat treatment on the glass material by 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, comprising a slow cooling step of lowering while controlling the temperature of the pressed molded body by the heater,
In at least one of the slow cooling step or the heating step, the mold unit is intermittently rotated by the rotation mechanism,
The control unit is configured such that the mold unit is longer than a stop time in which the mold unit is stopped at an initial relative angular position with respect to the transfer path immediately after being brought into at least one of the slow cooling chamber or the heating chamber. Is a method for manufacturing a glass molded body, wherein the rotation mechanism is controlled so that the stop time of stopping at a relative angular position different from the initial relative angular position becomes longer.   The control unit is configured to rotate the mold unit 90 degrees or 270 degrees relative to the initial relative angle position between the time when the mold unit is loaded into the slow cooling chamber or the heating chamber and the time when the mold unit is unloaded. The manufacturing method of the glass molded object of Claim 1 which controls the said rotation mechanism so that it may stop for the longest time in a position.   The control unit includes a stop time in which the mold unit is stopped at a relative angular position rotated 90 degrees from the initial relative angular position, and a relative angular position where the mold unit rotated 270 degrees from the initial relative angular position. The manufacturing method of the glass molded object of Claim 2 with which the said mold unit controls the said rotation mechanism so that the stop time which is stopped by may become equal. The transport mechanism has 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 3 arrange | positioned along the circumference on the said turntable.   The method for producing a glass molded body according to any one of claims 1 to 4, wherein the mold unit is rotated in both the slow cooling step and the heating step.   The stop time at which the mold unit is rotated relative to the initial relative angle position by 90 degrees relative to the tact time that is the time from when the mold unit is loaded into the at least one chamber to the time when the mold unit is unloaded, and the mold unit The manufacturing method of the glass molded object of Claim 5 whose ratio of the total time of the stop time which is a relative angle position rotated 270 degree | times from the said initial relative angle position is 60% or more and 85% or less.   The said mold unit is described in any one of Claim 1 to 6 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. The transport mechanism has a turntable in which an opening is formed,
The mold unit is placed and conveyed on the turntable so as to straddle the opening,
The rotation mechanism is disposed below the turntable, is capable of extending in the vertical direction, and has a rotation axis that can rotate around a central axis.
The manufacturing method of the glass forming body as described in any one of Claim 1 to 7. 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, 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 molded body, which are provided along the conveyance path,
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:
Further, the glass molded body manufacturing apparatus is provided in at least one of the slow cooling chamber or the heating chamber, and a rotation mechanism for intermittently rotating the mold unit,
A control unit that controls a stop angle position of the rotation mechanism and a staying time at the stop angle position, and
The control unit is configured such that the mold unit is more than the stop time at which the mold unit is stopped at the initial relative angular position with respect to the transfer path immediately after being brought into at least one of the slow cooling chamber or the heating chamber. A method for producing a glass molded body, wherein the rotation mechanism is controlled so that a stop time at a relative angle position different from an initial relative angle position is long.   The said metal mold | die unit is a manufacturing apparatus of the glass molded object described in Claim 9 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. The transport mechanism has a turntable in which an opening is formed,
The mold unit is placed and conveyed on the turntable so as to straddle the opening,
The rotation mechanism is disposed below the turntable, is capable of extending in the vertical direction, and has a rotation shaft that can rotate around a central axis.
The manufacturing apparatus of the glass molded object described in Claim 9 or 10.

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