JP2000072454A - Apparatus for production of disk-like glass and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the failure of the peripheral ends of disk-like glass at the time of sucking and transporting the glass. SOLUTION: This apparatus for producing the disk-like glass has a turn table 4 which is freely rotatably born, plural lower dies 6 which are arranged along the circumferential direction of a turn table 4 and are supplied with molten glass to their front surfaces, at least one upper dies 7 which form the disk-like glass by pressing the molten glass with these upper dies 7 and the lower dies 6, impact imparting means 30 and 33 which impart impact, preferably vibration, to the lower dies 6 before the disk-like glass is taken out of the top of the lower dies 6 and an ejecting means 2 which sucks the disk-like glass and takes the disk-like glass out of the top of the lower dies 6. The impact to be imparted to the lower dies by the impact imparting means acts to reduce the adhesion force between the peripheral ends of the disk-like glass and the inner peripheral surfaces of the lower dies 6 or molds 14, thereby decreasing the stresses acting on the peripheral ends of the glass at the time of ejection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped glass manufacturing apparatus for forming a disk-shaped glass by pressing molten glass with an upper die and a lower die, and more particularly to an apparatus for removing a disk-shaped glass after pressing. It relates to a material suitable for reducing glass breakage.

[0002]

2. Description of the Related Art In recent years, a glass substrate has been attracting attention as an alternative to an aluminum substrate used for a magnetic recording medium, and research and development thereof have been active. A glass substrate is generally superior in strength and flatness to an aluminum substrate. A glass substrate is formed by pressing molten glass (this is called glass cob) using an upper mold and a lower mold, cooling, polishing, and performing a necessary surface treatment (for example, chemical strengthening by an ion exchange method). And molded.

Conventionally, there is a manufacturing apparatus that presses molten glass using a turntable that enables continuous pressing of molten glass in order to improve the mass productivity. The turntable is provided with a plurality of lower dies along a circumferential direction thereof, and glass bumps are sequentially supplied thereto at predetermined positions. The glass bump on the lower mold is transferred to a press position where the upper mold is installed with the rotation of the turntable, and is formed into a disk shape having a thickness of about 1.2 mm by pressing the upper mold and the lower mold. The disc-shaped glass formed by the press is transported to a carry-out position through a warp correcting step as needed. At the carry-out position, the disc-shaped glass is vacuum-sucked from above, lifted up from the lower mold, and carried out. Then, the unloaded disk-shaped glass is passed to the next step, that is, polishing and surface treatment, after natural cooling.

[0004] FIG. 7 shows a state in which a molten glass bump G supplied on a pressing surface of a lower die is pressed to form a disk-shaped glass. The upper mold 70 and the lower mold 71 are respectively provided with a cylindrical upper body mold 72 and a lower body mold 73 around the periphery thereof. As shown in FIG.
The lower die 73 and the lower die 73 engage with each other to enable the horizontal positioning of the upper die 70 with respect to the lower die 71. Along with the positioning function, the upper inner peripheral wall 73a of the lower body die 73
Functions to define the peripheral edge of the disc-shaped glass G to be formed. That is, the molten glass bump expands and spreads in a disk shape by the upper die pressing, and reaches the upper inner peripheral wall 73a of the lower trunk die. The spread of the molten glass bump is stopped by the upper inner peripheral wall 73a, and the size of the disc-shaped glass is determined thereby. After pressing for several seconds, the upper mold 70 is lifted, and the disc-shaped glass G
Is transported to the unloading position by the rotation of the turntable, and unloaded from the lower mold 71.

[0005]

However, conventionally, in the process of carrying out the disk-shaped glass, the glass at the periphery of the disk may be damaged. Since the molten glass is stretched between the upper and lower molds by a load of several tons, the pressure causes the peripheral edge of the disc-shaped glass and the upper inner peripheral wall 7 of the lower body mold to move.
3a is in a state of close contact or adsorption (hereinafter, simply referred to as close contact). The close contact between the glass peripheral edge and the upper inner peripheral wall becomes a resistance when pulling up the disk-shaped glass,
As a result, stress is generated at the peripheral edge of the disc-shaped glass. When the stress exceeds the limit strength of the glass, the periphery of the glass is broken.

[0006] In the above disk-shaped glass manufacturing apparatus, a powdery heat-resistant solid lubricant (hereinafter, referred to as a releasing agent) is generally widely used in order to avoid fusion between the mold and the molten glass. Have been. Prior to the supply of the molten glass bump, the release agent is sprayed and adhered to the surfaces where the molten glass is in close contact, that is, the press surfaces of the upper mold and the lower mold, and the upper inner peripheral wall of the lower body mold. Since the release agent is interposed between the mold and the molten glass, the disc-shaped glass can be easily carried out without adhering to the mold.

However, when the sprayed release agent does not adhere well to the mold, the mold and the molten glass are fused at that portion. Since the upper inner peripheral wall 73a of the lower trunk is vertically steep, during the movement of the lower die by the turntable,
The release agent attached to the upper inner peripheral wall of the lower body mold may be shaken off due to the minute vibration of the lower mold accompanying the movement. This increases the adhesion between the peripheral edge of the disc-shaped glass after pressing and the upper inner peripheral wall of the lower body mold,
The potential for damage is increasing.

Accordingly, it is an object of the present invention to provide a method for manufacturing a disk-shaped glass, which comprises:
An object of the present invention is to reduce the adhesive force between the lower body and the upper inner peripheral wall to prevent breakage of the peripheral edge of the glass during unloading.

[0009]

According to the present invention, there is provided an apparatus for manufacturing a disk-shaped glass according to the present invention, comprising: a turntable rotatably supported; and a molten glass disposed along a circumferential direction of the turntable. A plurality of lower molds supplied to the upper surface thereof, at least one upper mold for forming the disc-shaped glass by pressing the molten glass with the lower mold, and before removing the disc-shaped glass from above the lower mold. Further, a striking means for striking the lower mold and an unloading means for adsorbing the disc-shaped glass and taking it out of the lower mold are provided.

According to the present invention, in addition to the above structure, the lower mold is fixed to the turntable so as to be vertically movable with respect to the turntable. And a body that defines the peripheral end.

The impact given to the lower mold by the impact applying means acts to reduce the adhesion between the peripheral edge of the disc-shaped glass and the inner peripheral surface of the lower mold or the barrel mold. As a result, when the disc-shaped glass is carried out by the carrying-out means, the stress on the glass peripheral edge is reduced, and the breakage of the glass is prevented.

Here, it is preferable that the impact given by the impact applying means is vibration.

Preferably, the impact applying means includes a driven shaft for pushing up the lower die from below the turntable, and a drive source for vertically moving the driven shaft.

In this case, it is preferable that the driven shaft is supported on the turntable below the lower die so as to be vertically movable, and the drive source is installed separately from the driven shaft.

The present invention further provides a guide rail which is installed along the circumferential direction of the turntable, and gradually inclines the driven shaft upward with the rotation of the turntable. It is preferable to adopt a configuration provided with.

In this case, it is preferable that a plurality of the driving sources are provided along the guide rail.

The present invention also relates to a method for producing a disk-shaped glass. The method of manufacturing a disk-shaped glass according to the present invention includes a step of receiving molten glass in a plurality of lower dies arranged along the circumferential direction of the turntable; and a step of opposing the lower die on the moving path of the lower die. The step of pressing the molten glass with the lower mold, moving the upper mold supported to be arranged toward the lower mold, and removing the pressed disc-shaped glass from the lower mold, The method includes a step of hitting the lower mold, and a step of sucking the disk-shaped glass and removing the glass from the lower mold.

In this case, it is preferable that the impact given to the lower mold is a vibration.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. In this embodiment, an example in which the present invention is applied to a manufacturing apparatus for forming a glass substrate serving as a substrate of a magnetic recording medium used in a hard disk device will be described. However, the present invention relates to an apparatus for manufacturing disk-shaped glass requiring high flatness, such as an information recording medium other than a magnetic recording medium, for example, an optical recording medium, a glass substrate used for an optical information recording medium, and a filter for a camera. It can be widely applied to

FIGS. 1 and 2 are a side view and a plan view, respectively, showing the appearance of a glass substrate manufacturing apparatus to which the present invention is applied. The manufacturing apparatus 1 includes various devices for supplying, cutting, and pressing molten glass, correcting warpage of the molten glass, and discharging the molten glass. The disc-shaped glass molded product formed by the present manufacturing apparatus 1 is carried out by the carry-out device 2 and transferred to a natural cooling conveyance path (not shown). After cooling here, it is transferred to a polishing step which is the next step.

In these figures, the manufacturing apparatus 1 includes a turntable 4 that is driven to rotate by a driving device 3. Near the periphery of the upper surface of the turntable 4, there are 16 lower dies 6a to
6p is installed. Each lower die 6 has a turntable 4
Are arranged at equal intervals on the same circumference on the upper surface of the.
It should be noted that some lower molds are omitted in FIG. 1 to clearly show other components. The lower mold 6 is moved on its circumference by the 1/16 step rotation of the turntable 4 (the turntable is rotated 1/16 in one step). The specific configuration of the lower mold 6 will be described later.

The manufacturing apparatus 1 is provided with various devices for supplying, cutting, pressing, correcting warpage, and carrying out the molten glass on the moving path of the lower die 6. The supply of the molten glass is a tubular molten glass from a melting furnace (not shown),
This is achieved by cutting with a cutting device and dropping it onto the press surface of the lower mold 6. The melting furnace and the cutting device are installed at a position A shown by a broken line in FIG. 2 and supply molten glass, that is, glass cob, onto a lower mold (the lower mold 6a in the figure) immediately below the melting furnace. Prior to the supply of the molten glass described above, a release agent is sprayed on the press surface of the lower die 6 and on the inner peripheral surface of the lower trunk die described later. The release agent prevents the supplied glass bump from fusing to the mold.

The pressing of the molten glass is achieved by the upper die 7 for pressing. The upper die for press 7 has a support structure 1
The air cylinder 8 is supported by the drive shaft of the air cylinder 8 and is movable in a direction in which the lower cylinder 6 comes into contact with and separates from the lower mold 6. Pressing of the molten glass on the lower die 6 is performed by the lowering operation of the upper die 7 for pressing. The upper die 7 for press
It is installed at the position B in FIG. 2 and presses the molten glass on the lower mold (the lower mold 6c in the figure) that comes directly under the glass, and
It is formed into a disk with a thickness of about 2mm. The warp correction of the disc-shaped glass is achieved by a plurality of warp correcting upper dies 9 arranged continuously downstream of the press upper die 7. In the present embodiment, three warp correcting upper dies 9 and an air cylinder 10 are provided, and these are supported by the support structure 11 at positions C, D, and E in FIG. The manufacturing apparatus 1 has heating devices 12 and 13 for heating the upper mold and the lower mold, whereby the temperature of each of the lower molds 6 and the upper molds 7 and 9 is at least the glass transition of the molten glass. It is kept above the point (about 500 ° C).

The unloading device 2 picks up the disk-shaped glass after the warpage correction from the lower mold 6 and transfers it to a cooling path (not shown). The unloading device 2 includes three suction heads 22 at the tip of a swing arm 21 that is movable between the lower die 6 and the cooling path. The suction head 22 is connected to a compressor installed in the unloading device 2, and vacuum-suctions the disk-shaped glass on the lower mold 6 from above. The three disk-shaped glasses (the glass on the lower molds 6l to 6n in FIG. 2) are simultaneously suctioned by the three suction heads 22,
It is carried out by the rotation of the swing arm 21. The above adsorption is released on the cooling passage, and the three disc-shaped glasses are dropped onto the cooling passage. When the turntable 4 is rotated by three steps and the lower die 6k in FIG. 2 moves to the position of the lower die 6n, the disks on the lower dies 6i to 6k are sucked by the suction head 22, and the next unloading is performed.

The manufacturing apparatus 1 is further provided with a vibration applying mechanism for applying vibration to the lower mold 6 on which the disk-shaped glass before unloading is placed. The vibrating mechanism vibrates several times before the disk-shaped glass after the warpage correction comes to the unloading position by the unloading device 2. It is provided with an air cylinder installed at a location and a driven shaft installed below each lower mold 6.

FIG. 3 is a sectional view for explaining the vibration applying mechanism. In the figure, a cross section of the turntable 4 and a cross section of the air cylinder 33 at the position of the lower die 6 are shown. First, prior to the description of the vibration applying mechanism, the structure of the lower die 6 will be described. The upper surface of the lower mold 6 is pressed 61
It is housed in a cylindrical lower body mold 14 having an open upper surface so as to be vertically slidable. The lower die 6 includes an outer cylinder member 62 having a pressing surface 61 and a shaft portion 6.
3 is provided. The shaft 63 is
It protrudes downward from a hole 14b formed in the bottom of the lower body die 14. With the lower surface of the lower die 6 in contact with the upper surface of the inside of the lower die 14, the upper inner peripheral wall 14 a of the lower die 14 rises above the press surface 61 of the lower die 6. Therefore, the disc-shaped glass G pressed by the upper mold 7 and warped and corrected by the warp correcting upper mold 9 is contained in a region surrounded by the press surface 61 and the upper inner peripheral wall 14a of the lower body mold 14. The lower torso mold 14 is provided with mounting members 15 and 16
It is fixed to the turntable 4. Turntable 4
A circular hole 4a is formed at the lower die mounting position,
Here, the mounting member 16 is fitted.

Driven shaft 3 constituting the above-mentioned vibration applying mechanism
Reference numeral 0 denotes a vertically movable shaft which is disposed so as to penetrate the mounting member 16 in the vertical direction. Driven shaft 3
0 is accommodated in a cylindrical space 16a formed in the mounting member 16, and the large-diameter body 30a
The stroke of the driven shaft 30 is determined by the moving range of the trunk 30a within 6a. The upper end 30 b of the driven shaft 30 is in contact with the shaft 63 of the lower die 6. Therefore, when the driven shaft 30 is moved upward, the lower mold 6 also moves upward with respect to the fixed lower body mold 14.

A lower end of the driven shaft 30 extends below the turntable 4, and a roller 32 is provided at a leading end of the driven shaft 30 via a bearing shaft 31. The roller 32 travels on a rail 40 arranged along the circumferential direction of the turntable 4 as the turntable 4 rotates. As will be described later in detail, the rail 40 is slightly inclined upward in the rotation direction of the turntable 4, so that the roller 32 is
As the vehicle travels above zero, the driven shaft 30 is gradually lifted upward.

The air cylinder 33 is connected to F,
At positions G, H and I, it is fixed to the device frame 5. As shown in FIG. 3, the air cylinder 33 includes a piston 34 which is moved up and down by a built-in air compressor. The piston 34 has a flange 34 a, which is housed in the air chamber 35. When compressed air from the air compressor is sent into the air chamber 35 from the flow path 33a, the flange 34a and the piston 34 are pushed upward. Conversely, the compressed air from the air compressor flows from the flow path 33b to the air chamber 35.
When pushed into, the piston 34 is pushed down. A height adjusting screw 36 is provided at the upper end of the piston 34. By adjusting the amount of screwing into the piston 34, the height of the head 36a can be adjusted. The turntable 4 rotates and the lower mold 6
When any one of F, G, H, and I in FIG. 2 is reached, the lower end 30c of the driven shaft 30 is disposed at a position facing the head 36a of the height adjustment screw. 2A to 2I, the clearance between the head 36a of the height adjusting screw and the lower end 30c of the driven shaft 30 is kept constant. Since the rail 40 for guiding the roller 32 is slightly inclined upward as described above, the height position of the lower end 30c of the driven shaft differs at each position. The height of the head 36a is adjusted by the height adjusting screw 36 so that the clearance is constant.

In the above configuration, when the air cylinder 33 is driven and the piston 34 moves up and down, the head 36
a contacts the driven shaft 30. Here, the stroke of the piston 34 is about 8 mm.
Due to the above clearance at the top of 4, the driven shaft 30 can be lifted slightly. In one embodiment, the maximum displacement of the driven shaft 30 was 0.4 mm by setting the stroke of the piston 34 to 8 mm and the clearance to 7.6 mm. Due to the thrust of the piston 34, a minute vibration is given to the driven shaft 30. The vibration given to the driven shaft 30 propagates to the lower die 6 above the driven shaft 30,
It is further provided to a disc-shaped glass G thereon.

FIG. 3 shows a cooling structure of the lower mold 6 in addition to the above structure. As shown in the drawing, the piston 34, the driven shaft 30, and the inner member 64 of the lower die 6 are shown.
The lower body die 14 is formed with cooling passages 37a, 37b, 37c and 37d which communicate with each other when the air cylinder 33 is driven, so that cooling air can be supplied from below the piston 34. By sending out the cooling air when the piston 34 rises, the cooling air flows into the lower mold 6 from the cooling passage and cools the lower mold 6. The disk-shaped glass after the warp correction has different temperature gradients on the front and back surfaces due to the residual heat of the lower mold 6. This delays the shrinkage of the back side, which may cause warpage. The above-described cooling structure allows the lower mold 6 to be appropriately cooled, thereby avoiding the warping problem.

FIG. 4 shows the timing at which vibration is applied to the lower mold 6 by the vibrating mechanism. Chart (A)
The rotation / stop operation of the turntable 4 that rotates stepwise is shown. In one embodiment, the rotation time T1 of the turntable 4 is about 1.7 seconds and the stop time T2 is about 1.2 seconds. As shown in the chart (B), while the turntable 4 is stopped, the vibrating mechanism applies three vibrations to the lower die 6 at short intervals. In one embodiment, the interval between oscillations is about 0.4 seconds. Therefore, when focusing on one lower mold, the lower mold is
Vibration is received three times at each of the four stop positions F, G, H, and I.

FIG. 5 is a diagram schematically showing the relationship between the inclination of the rail 40 and the applied position. The following description focuses on one lower mold on the turntable. Rail 40
Is slightly inclined upward in the rotation direction of the turntable 4. The rail 40 is inclined upward at a slight gradient from a point past the point E in FIG. 2 where the warp correcting press is arranged, and comes into contact with the roller 32 at the point F. Here, the first vibration is given by the vibration applying mechanism. Turntable 4
Is rotated, and the roller 32 runs on the rail 40, the inclined surface thereof causes the driven shaft 30 and the lower mold 6 to extend.
The upper disk-shaped glass G is slightly lifted upward. When the roller 32, that is, the lower mold 6 reaches the point G, the turntable 4 stops, and the second vibration is applied to the lower mold 6. With the next rotation of the turntable 4, the roller 32 further goes up the inclined surface of the rail 40. Thereby, the disc-shaped glass G is further lifted upward. Similarly, the glass G on the disk is
Vibration is applied at H point and I point, and it is gradually lifted up along the rail 40.

FIG. 6 shows a state where the disk-shaped glass G is gradually lifted with respect to the lower body mold 14 by the action of the rail 40 and the vibration applying mechanism described above. FIG. 5A shows a state of the disc-shaped glass G before the rail 40 operates. In the same figure, a state in which the disk-shaped glass G is gradually lifted upward by the inclination of the rail 40 is indicated by a virtual line. Fig. (B)
Shows the state of the disc-shaped glass G at the unloading position P in FIG. In the embodiment, the inclination height H of the rail 40 (the height from the point F in FIG. 5 to the unloading point P) and the rising height h of the upper inner peripheral wall 14a of the lower body die 14 in FIG. As a result, the disc-shaped glass G is located above the upper surface of the lower drum 14 at the carry-out position. Therefore, the pickup of the disc-shaped glass G by the unloading device 2 becomes easy.

Thus, the vibration applying mechanism and the rail 40
, The disc-shaped glass G is gradually pushed upward while being repeatedly subjected to minute vibration.
As a result, the adhesive strength between the lower inner peripheral wall 14a and the peripheral edge of the disc-shaped glass is weakened, and the upper inner peripheral wall 14a
Is prevented from being caught by the glass, and damage to the peripheral edge of the disk-shaped glass at the time of unloading is prevented.

The vibration by the vibrating mechanism is applied to the lower mold 6.
The mold release agent that enters the gap between the lower mold 14 and the lower mold 14 is discharged to the outside, and the secondary effect of smoothing the operation of the lower mold 6 with respect to the lower mold 14 is provided. Since the release agent sprayed on the press surface 61 of the lower die 6 is a fine powder, the lower die 6 and the lower body die 1
4 and gradually accumulates in the gap, which may hinder the operation of the lower mold 6. The vibration applied to the lower mold 6 by the vibrating mechanism functions to shake off the release agent in the gap. The release agent shaken off is discharged to the outside from the cooling passage 37d of the lower body mold 14.

Next, the manufacturing apparatus 1 exemplified in the above embodiment will be described.
A method for manufacturing a glass substrate for a magnetic recording medium will be described in detail below. Using the above apparatus, a thin glass substrate for a magnetic recording medium can be manufactured by a direct press method with high mass productivity and productivity. As the glass material, crystallized glass or amorphous glass is used.

First, the molten glass is passed through a lower mold 6 through a nozzle.
To supply. Then, the molten glass bump supplied on the lower mold is pressed by the upper mold for press 7. At this time, a load exceeding about 1 t is applied to the upper die for press 7. As a result, the molten glass adheres to the entire upper surface of the lower mold 6 and the lower body mold 14. However, since the temperatures of the lower mold 6 and the upper molds 7 and 9 are maintained at a temperature equal to or higher than the transition point of the molten glass, immediately after pressing, the glass for a magnetic recording medium thinly and flatly extended on the upper surface of the lower mold 6. The glass periphery of the substrate is separated from the lower mold by the preheating of the upper surface of the lower mold. For this reason, once the periphery of the glass is warped, the flatness of the glass substrate for a magnetic recording medium can be improved by pressing again with the upper mold 9 for correcting warpage.

Next, the driven shaft 30 is driven by the vibrating mechanism.
Vibration is applied to the lower mold 6 through the above, so that the close contact between the disc-shaped glass and the lower mold 6 and the lower body mold 14 is reduced or released. While applying such vibrations a plurality of times, the glass substrate is gradually lifted so as to be higher than the upper end surface of the lower body mold 14.

Thereafter, the glass substrate on the lower mold 6 is sucked by the suction head 22 and taken out from the lower mold 6 and the lower body mold 14.
Finally, grinding and polishing are performed to improve flatness and surface accuracy, thereby completing a glass substrate for a magnetic recording medium.
As described above, since the glass substrate is unloaded after the lower die 6 is vibrated, the glass substrate which is thinly stretched into a disk shape by repeated presses and firmly adheres to the lower die or the like is unloading error, or The glass substrate can be carried out while preventing damage.

When the lower mold 6 is vibrated, it is necessary to prevent a problem that the temperature of the disk-shaped glass is higher than the softening point and the glass is deformed by hitting to deteriorate the flatness. Therefore, as for the state of the glass that gives vibration to the lower mold 6, it is preferable that the temperature of the disc-shaped glass is lower than the softening point and the temperature inside the glass is lower than the transition point of the glass. The term “glass temperature” as used herein means an average temperature of the entire glass excluding the glass surface.

In the above embodiment, the lower mold is vibrated to release the close contact of the glass substrate with the mold.
A single hit may be used instead of such a hit with vibration. Further, the number of times of applying the impact or the vibration may be a single number instead of a plurality of times as in the above embodiment. Also, as in the above-described embodiment, the forming die includes an upper die, a lower die, and a body die.For example, a lower die having a wall portion defining a shape near the periphery of the glass substrate formed around the lower die, Press molding may be performed with the upper mold.

The embodiment of the present invention has been described in detail with reference to the drawings. However, it is obvious that the scope of the present invention is not limited to the matters described in the above embodiment, and is determined based on the description in the claims.
In the above embodiment, the vibration applying mechanism is constituted by the driven shaft 30 provided on the turntable side and the air cylinder 33 provided on the device frame side. However, the vibration applying mechanism can be realized by another configuration that applies vibration to the lower mold for a predetermined time. For example, a method of directly exposing the lower end of the lower die 6 to the lower surface side of the turntable 4 and making contact with the piston 34 of the air cylinder 33 without passing through the driven shaft 30 may be adopted. Further, a configuration may be adopted in which a drive source for giving vibration is installed on the turntable 4 side. Further, the timing of giving the vibration shown in the embodiment can be variously selected according to the environment. Also,
In the present invention, the turntable has a rotation center of one.
The shape is not limited to a circular shape as a dot, but may be any as long as it forms a circulating transport path.

[0044]

As described above, according to the present invention, before the disk-shaped glass is sucked and conveyed by the vibration applied by the vibrating means, the peripheral edge of the disk-shaped glass and the upper inner peripheral wall of the lower body type are formed. Adhesion between the glass members is reduced, so that damage to the peripheral edge of the glass during unloading is prevented.

In addition, the vibration shakes off the release agent that enters the gap between the lower mold and the lower mold, thereby smoothing the operation of the lower mold with respect to the lower mold.

Further, in the present invention having the guide rail, the disc-shaped glass is gradually pushed upward from the inside of the upper inner peripheral wall of the lower body with the rotation of the turntable. In addition, the disc-shaped glass is quickly pulled up from the bottom of the upper inner peripheral wall, and as a result, there is no accident that the peripheral edge of the glass is broken by the resistance force of the inner peripheral wall.

[Brief description of the drawings]

FIG. 1 is a side view of the appearance of an apparatus showing a glass substrate manufacturing apparatus to which the present invention is applied.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view of a turntable and an air cylinder at a lower mold position for explaining a vibration applying mechanism according to the present invention.

FIG. 4 is a timing chart showing timings at which vibration is applied to a lower die by a vibration applying mechanism.

FIG. 5 is a diagram schematically showing a relationship between a gradient of a rail and an applied position.

FIG. 6 is an enlarged sectional view of an upper portion of a lower mold showing a state where a disk-shaped glass is gradually lifted by a rail and a vibration applying mechanism.

FIG. 7 is a view showing a step of pressing a molten glass cob with a lower mold and an upper mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manufacturing device 2 Unloading device 3 Drive device 4 Turntable 5 Device frame 6a-6p Lower die 7 Upper die for press 8 Air cylinder 9 Upper die for correction 10 Air cylinder 11 Support structure 12, 13 Heating device 14 Lower trunk type 14a Upper inner peripheral wall 15, 16 Attachment member 21 Swing arm 22 Suction head 30 Driven shaft 31 Bearing shaft 32 Roller 33 Air cylinder 34 Piston 35 Air chamber 36 Adjustment screw 37a-37d Cooling passage 40 Rail

Claims (9)

[Claims] 1. A turntable rotatably supported, a plurality of lower dies arranged along a circumferential direction of the turntable to supply molten glass to an upper surface thereof, and the lower glass with the lower die. And pressing at least one upper mold to form a disc-shaped glass, and before taking out the disc-shaped glass from above the lower mold,
An apparatus for manufacturing a disc-shaped glass, comprising: a striking means for striking the lower mold; and a carrying-out means for adsorbing the disc-shaped glass and taking out the glass from the lower mold. 2. A turntable rotatably supported, a plurality of lower molds arranged along a circumferential direction of the turntable and supplying molten glass to an upper surface of the turntable, and the molten glass formed by the lower mold. And pressing at least one upper mold to form a disc-shaped glass, fixed to the turntable, and supporting the lower mold so as to be vertically movable with respect to the turntable, and at an upper peripheral edge of the lower mold, Before removing the disk-shaped glass from above the lower die, the body mold that defines the peripheral end of the disk-shaped glass,
An apparatus for manufacturing a disc-shaped glass, comprising: a striking means for striking the lower mold for a predetermined time; and an unloading means for adsorbing the disc-shaped glass and removing the disc-shaped glass from above the lower mold. 3. The apparatus for producing a disk-shaped glass according to claim 1, wherein the impact applied by said impact applying means is vibration. 4. A driven shaft, wherein the impact applying means pushes up the lower mold from below the turntable,
4. The apparatus for producing a disk-shaped glass according to claim 1, further comprising a drive source for moving the driven shaft up and down. 5. The driven shaft is vertically movably supported by the turntable below the lower die.
5. The disc-shaped glass manufacturing apparatus according to claim 4, wherein the drive source is installed separately from the driven shaft. 6. A guide rail is provided along a circumferential direction of the turntable, and the guide rail is inclined with respect to the turntable, and gradually pushes the driven shaft upward with the rotation of the turntable. An apparatus for manufacturing a disc-shaped glass according to claim 5. 7. The disk-shaped glass manufacturing apparatus according to claim 6, wherein a plurality of the driving sources are provided along the guide rail. 8. A step of receiving molten glass in a plurality of lower dies arranged along the circumferential direction of the turntable; and supporting the lower glass on the moving path of the lower die so as to face the lower die. A step of moving the mold toward the lower mold and pressing the molten glass with the lower mold; and applying an impact to the lower mold before removing the pressed disk-shaped glass from above the lower mold. A method for producing a disc-shaped glass, comprising: a step of adsorbing the disc-shaped glass and removing the disc from the lower mold. 9. The method for producing a disk-shaped glass according to claim 8, wherein the impact applied to the lower mold is vibration.