JP2012082096A - Method for manufacturing molded glass body, glass molding tool and component for glass molding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a molded glass body which can easily manufacture a high quality molded glass body, and to provide a glass molding tool and components for a glass molding tool.SOLUTION: The method for manufacturing a molded glass body comprises the steps of: forming a receiving surface 30 which receives molten glass MG by fitting a first fitting section 20 including a surface 21 constituting a part of the receiving surface 30 to an outer peripheral section 10 including a surface 11 constituting the other part of the receiving surface 30; supplying molten glass MG to the receiving surface 30; forming a molten glass gob GG on the receiving surface 30; detaching the first fitting section 20 from the outer peripheral section 10; disposing the molten glass gob GG on the outer peripheral section 10 onto a molding surface different from the receiving surface 30; and molding the molten glass gob GG into a molded glass body GM on the molding surface.

Description

  The present invention relates to a technique for producing a glass molded body.

  Conventionally, as a glass molded body manufacturing apparatus, for example, a receiving mold for receiving molten glass at a receiving surface and a forming mold for receiving a molten glass lump falling from the receiving mold are provided, and at the deepest portion of the receiving surface, An apparatus that can be divided into two split molds is disclosed (see Patent Document 1).

  In this apparatus, for example, after receiving molten glass with a receiving mold for ejecting gas to form a molten glass lump, the receiving mold is divided into split molds, and the molten glass lump that has fallen is received with the forming mold to obtain the molten glass lump. Molded to produce a glass molded body.

JP 2006-265085 A

  However, when a glass molded body is manufactured using the apparatus disclosed in Patent Document 1, irregularities are likely to occur in a portion of the surface of the glass molded body facing the boundary of the split mold. In a glass molded body having irregularities on the surface, the surface of a product such as an optical element is difficult to be smooth, and it is difficult to produce a product having desired characteristics and shape.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for producing a glass molded body, a glass mold and a glass mold part capable of easily producing a high-quality glass molded body. To do.

  The present inventors use a molding die in which the first fitting portion including the surface constituting a part of the receiving surface is detachably fitted to the outer peripheral portion including the surface constituting the other portion of the receiving surface. The present inventors have found that a molten glass lump can be easily arranged on a molding surface and have completed the present invention. Specifically, the present invention provides the following.

(1) A method for producing a glass molded body,
A first fitting portion including a surface constituting a part of a receiving surface for receiving molten glass is fitted to an outer peripheral portion including a surface constituting another portion of the receiving surface, thereby forming the receiving surface,
Supplying molten glass to the receiving surface, forming a molten glass lump on the receiving surface;
The first fitting portion is removed from the outer peripheral portion, the molten glass lump on the outer peripheral portion is disposed on a molding surface different from the receiving surface,
The manufacturing method of the glass forming body which has the process of shape | molding the said molten glass lump into a glass forming body on the said shaping | molding surface.

  (2) The manufacturing method according to (1), wherein a part of the receiving surface is opposed to a portion of the molten glass lump that is a functional surface of the glass molded body.

  (3) The manufacturing method according to (1) or (2), wherein a boundary between a part of the receiving surface and another part is opposed to a part of the molten glass lump that does not become a functional surface of the glass molded body.

  (4) By fitting a second fitting portion including a surface constituting a part of the molding surface to the outer peripheral portion after removing the first fitting portion to form the molding surface, The manufacturing method in any one of (1) to (3) which arrange | positions a molten glass lump on the said molding surface.

(5) As the outer peripheral portion, one that can be divided into two or more split molds,
The manufacturing method according to any one of (1) to (3), wherein the molten glass lump on the outer peripheral portion is dropped onto the forming surface by dividing the outer peripheral portion into a split mold above the forming surface.

  (6) An optical element is manufactured by transferring the glass molded body manufactured by the manufacturing method according to any one of (1) to (5) to a press molding mold and performing press molding with the press molding mold. A method for manufacturing an optical element.

  (7) The method according to (6), wherein the glass molded body is transferred in a state where the glass molded body is held on the outer peripheral portion.

  (8) A lens with a lens barrel in which an optical lens is fixed to the lens barrel is manufactured as an optical element by press-molding the glass molded body using the lens barrel as the outer peripheral portion (6) or (7) Manufacturing method.

  (9) The method further includes a step of holding the optical element after press molding on the outer peripheral portion and cooling and packing the optical element while maintaining a state where the functional surface is not in contact with another object. 8) The production method according to any one of the above.

  (10) The manufacturing method according to (9), wherein the packaging of the optical element is performed using the outer peripheral portion as a container.

  (11) A method for manufacturing an optical device that manufactures an optical device using the optical element manufactured by the manufacturing method according to any one of (6) to (10).

(12) A glass molding die provided with a mold base material having a placement surface on which a glass lump is placed,
The mold base material has a fitting portion including a surface constituting a part of the placement surface, and an outer peripheral portion including a surface surrounding the fitting portion and constituting the other portion of the placement surface,
A glass molding die in which the fitting portion is detachably fitted to the outer peripheral portion to form the placement surface.

  (13) The glass mold according to (12), wherein a part of the placement surface includes a center of the receiving surface.

  (14) The glass mold according to (12) or (13), wherein the outer peripheral portion can be divided into two or more split molds.

(15) A glass mold part used as a fitting portion in the glass mold according to any one of (12) to (14),
Comprising a surface constituting a part of the mounting surface,
A glass mold part that is detachably fitted to the outer peripheral portion to form the placement surface.

  According to the present invention, while the molten glass lump on the receiving surface is arranged on the molding surface, the molten glass lump is supported only on the outer peripheral portion, so this portion is appropriately selected in relation to the functional surface of the glass molded body By doing so, a glass molded body having a functional surface of a desired shape is manufactured. Thereby, a high-quality glass molded object can be manufactured easily.

It is sectional drawing of the shaping | molding die used with the manufacturing method of the glass forming body which concerns on 1st Embodiment of this invention. It is sectional drawing of another shaping | molding die used with the manufacturing method of the glass forming body which concerns on the said embodiment. It is a figure which shows the process of the manufacturing method of the glass forming body which concerns on the said embodiment. It is sectional drawing of the shaping | molding die used with the manufacturing method of the glass forming body which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the division | segmentation state of the shaping | molding die of FIG. It is a figure which shows the process of the manufacturing method of the glass forming body which concerns on the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in description of each embodiment other than 1st Embodiment, the same code | symbol is attached | subjected about what is common in 1st Embodiment, and the description is abbreviate | omitted.

<First Embodiment>
FIG. 1 is a cross-sectional view of a mold used in the method for producing a glass molded body according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of another mold used in the method according to this embodiment. Moreover, FIG. 3 is a figure which shows the process of the manufacturing method of the glass forming body which concerns on this embodiment.

  As shown in FIG. 1, the glass mold according to the present embodiment includes a mold base material having a receiving surface 30 on which a glass lump is placed, and the mold base material constitutes a part of the receiving surface 30. It has the 1st fitting part 20 containing the surface 21, and the outer peripheral part 10 containing the surface 11 which surrounds this 1st fitting part 20 and comprises the other part of the receiving surface 30. FIG. And the 1st fitting part 20 is detachably fitted by the outer peripheral part 10, and the receiving surface 30 is formed. Since the receiving surface 30 generally needs to be smooth, the surfaces 11 and 21 have a shape that is continuous through the boundary 31.

  As shown in FIG. 3, the first fitting portion 20 including the surface 21 is fitted to the outer peripheral portion 10 including the surface 11 to form a receiving surface 30 (A to B), and supplied to the receiving surface 30. Molten glass MG is supplied from the tube 50 to form a molten glass lump GG on the receiving surface 30 (C to D). In this process, it is the boundary 31 between the surfaces 11 and 21 that easily causes unevenness in the molten glass lump. Therefore, it is preferable that the boundary 31 is opposed to a portion of the molten glass lump GG that does not become a functional surface of the glass molded body GM so that unevenness does not occur on the functional surface.

  Although the part used as the functional surface of the glass molded object GM is selected suitably, generally it is a part including a center in many cases. Therefore, it is preferable that the boundary 31 is located outward from the viewpoint of improving the versatility of the glass mold. However, the boundary 31 may be located at the center or in the vicinity thereof. In addition, it is desirable to consider that the molten glass lump supported by the outer peripheral portion 10 is likely to be deformed when the boundary 31 is located excessively outward in the molten glass lump arranging step described later.

  In the present embodiment, the surface forming body 24 having the surface 21 is inserted into the hollow portion of the outer peripheral portion 10. Here, since the side portion 23 of the surface forming body 24 has a shape that is substantially symmetrical with the inner wall 13 of the hollow portion of the outer peripheral portion 10, the first fitting portion 20 is detachably fitted to the outer peripheral portion 10. Is done. The cross-sectional shapes of the side portion 23 and the inner wall 13 are not particularly limited, and may be a circle, an ellipse, a rectangle, or the like, but is preferably a circle in that it is symmetric with respect to the molten glass lump.

  Like this embodiment, it is preferable that the collar part 25 is provided in the outer periphery of the surface formation body 24. As shown in FIG. When the surface forming body 24 is inserted into the hollow portion of the outer peripheral portion 10, the flange portion 25 is eventually locked to the lower surface 15 and the insertion is stopped, so that the positional relationship between the surfaces 11 and 21 can be made constant. it can. Therefore, the smooth receiving surface 30 can be reliably formed by designing the flange 25 so that the surfaces 11 and 21 are smoothly continuous when locked to the lower surface 15. In addition, the specific structure of the collar part 25 will not be specifically limited if it is latched by the lower surface 15 and the insertion of the surface formation body 24 can be stopped.

  In addition, as in the present embodiment, the surface forming body 24 is preferably configured to be porous. Thereby, since gas can be ejected from the surface 21 to the molten glass MG by supplying the gas to the surface forming body 24, the molten glass MG adheres to the surface 21, and the quality of the glass molded body decreases. The situation where the surface 21 is damaged can be suppressed. The surface forming body 24 may be non-porous or non-porous with pores formed therein.

  As shown in FIG. 3, the first fitting portion 20 is removed from the outer peripheral portion 10 (E), and the molten glass lump GG on the outer peripheral portion 10 is received on a molding surface different from the receiving surface 30. During this time, since the molten glass lump GG is supported only on the outer peripheral portion 10, the portion facing the surface 11 of the molten glass lump GG is likely to be uneven due to its own weight, while the portion not facing the surface 11 (that is, the surface Concavities and convexities are unlikely to occur in the portion facing 21. Therefore, the glass molded body GM which has a functional surface of a desired shape is manufactured by selecting this part suitably in relation to the functional surface of the glass molded body GM. Specifically, when forming the molten glass lump, it is preferable that the surface 21 is opposed to a portion of the molten glass lump GG that becomes a functional surface of the glass molded body GM.

  In the present embodiment, as shown in FIGS. 3F to 3G, the outer peripheral portion 10 after removing the first fitting portion 20 includes a surface 41 that constitutes a part of the molding surface 30 ′. The molten glass lump GG is disposed on the molding surface 30 ′ by fitting the two fitting portions 40 to form the molding surface 30 ′. Thereby, since the molten glass lump GG is arranged on the surface 11 from the receiving surface 30 to the molding surface 30 ′, a large change in the attitude of the molten glass lump GG hardly occurs, such as uneven thickness during molding. The situation can be easily suppressed.

  The detail of the 2nd fitting part 40 is shown in FIG. The outer peripheral portion 10 is detachably fitted with a second fitting portion 40 including a surface 41 constituting a part of the molding surface 30 'to form a molding surface 30'. Since the molding surface 30 ′ is also generally required to be smooth, the surfaces 11 and 41 have a shape that is continuous via the boundary 31.

  In the present embodiment, the surface forming body 44 having the surface 41 is inserted into the hollow portion of the outer peripheral portion 10. Here, since the side portion 43 of the surface forming body 44 has a shape that is substantially symmetrical with the inner wall 13 of the hollow portion of the outer peripheral portion 10, the second fitting portion 40 is detachably fitted to the outer peripheral portion 10. Is done. The cross-sectional shape of the side portion 43 is not particularly limited and may be a circle, an ellipse, a rectangle, or the like, but is preferably a circle in that it is symmetrical with respect to the molten glass lump.

  Like this embodiment, it is preferable that the collar part 45 is provided in the outer periphery of the surface formation body 44. As shown in FIG. When the surface forming body 44 is inserted into the hollow portion of the outer peripheral portion 10, the collar portion 45 is eventually locked to the lower surface 15 and the insertion is stopped, so that the positional relationship between the surfaces 11 and 41 can be made constant. it can. Therefore, the smooth molding surface 30 ′ can be reliably formed by designing the flange portion 45 so that the surfaces 11 and 41 are smoothly continuous when locked to the lower surface 15. In addition, the specific structure of the collar part 25 will not be specifically limited if it is latched by the lower surface 15 and the insertion of the surface formation body 24 can be stopped.

  In the present embodiment, the surfaces 21 and 41 may have the same or different characteristics. A surface 21 suitable for forming a molten glass lump GG from the molten glass MG and a surface 41 suitable for forming a glass molded body GM from the molten glass lump GG are independently used to produce a higher quality glass molded body. be able to. Specifically, since the molten glass MG is excellent in deformability, even if the shape of the surface 21 is transferred to the molten glass MG, it can be smoothly returned to the glass molded body GM. For this reason, it is preferable that the surface 21 is configured with priority given to suppressing adhesion of the molten glass MG. On the other hand, since the molten glass lump GG is poorly deformable, the shape of the surface 41 is easy to determine the shape of the molten glass lump GG, but is less likely to adhere to the surface 41 because the temperature is lower than that of the molten glass MG. For this reason, it is preferable that the surface 41 is configured with priority given to smoothness.

  For example, in this embodiment, the surface forming body 44 is configured to be non-porous. Thereby, since the surface forming body 44 has a somewhat smooth shape, the surface of the glass molded body GM to which the shape is transferred can be smoothed. However, the surface forming body 24 may be porous or non-porous with pores formed therein.

  In the present embodiment, the surface 41 has a shape that approximates the glass molded body GM to be manufactured. Thereby, the curvature of the surface 41 is different from the curvature of the surface 21 which can be shared regardless of the shape of the glass molded body GM. In addition, although the shape of the surfaces 21 and 41 is a concave surface in FIG. 2, it is not restricted to this, A plane and a convex surface may be sufficient.

  The present invention is a glass molding die including a mold base material having a mounting surface on which a glass lump is placed, and the mold base material includes a fitting portion including a surface constituting a part of the mounting surface, A glass mold that surrounds the fitting portion and includes an outer peripheral portion that includes a surface that constitutes another portion of the mounting surface, and the mounting portion is detachably fitted to the outer peripheral portion to form the mounting surface Is included. The first fitting portion 20 and the second fitting portion 40 described above constitute a fitting portion, and the receiving surface 30 and the molding surface 30 'constitute a mounting surface.

  Further, the present invention is a glass mold part used as a fitting portion in a glass mold, and includes a surface that constitutes a part of a mounting surface, and is detachably fitted to an outer peripheral portion to be mounted. Also included are glass mold parts that form The first fitting portion 20 and the second fitting portion 40 described above constitute this glass mold part.

  Furthermore, the present invention provides an optical element manufacturing method for manufacturing an optical element using the glass molded body manufactured by the method of the present invention, and an optical apparatus for manufacturing an optical apparatus using the optical element manufactured by the manufacturing method. This manufacturing method is also included. The glass molded body produced by the method of the present invention is useful as a material for optical elements because it is of high quality and can be easily produced and inexpensive.

  In the method for producing an optical element of the present invention, the glass molded body GM is transferred to a press molding mold (not shown), and the optical element is manufactured by performing press molding with this press molding mold. Transfer of the glass molded body GM is preferably performed in a state where the glass molded body GM is held on the outer peripheral portion 10 in terms of simplification of equipment and suppression of damage to the glass molded body GM during transfer. However, the transfer of the glass molded body GM is not limited to this, and may be performed by another means.

  The optical element manufacturing method of the present invention further includes a step of holding the optical element after press molding on the outer peripheral portion 10, cooling and packing the optical element while maintaining a state where the functional surface does not come into contact with another object. It is preferable to have. Thereby, especially the damage of the functional surface of an optical element can be suppressed until packing. Moreover, it is preferable to pack an optical element by using an outer peripheral part as a container. Thereby, the process of transferring the optical element from the outer peripheral portion to the packaging container is omitted, and the equipment can be simplified and further damage of the optical element can be suppressed during the transfer.

  The optical element in this invention is not limited to what consists only of glass members, such as an optical lens. For example, a lens with a lens barrel having a structure in which an optical lens is fixed to a lens barrel manufactured by press-molding a glass molded body using a lens barrel as an outer peripheral portion also corresponds to the optical element in the present invention. In addition, since the general manufacturing method of the lens with a lens barrel is conventionally well-known, description is abbreviate | omitted (for example, Unexamined-Japanese-Patent No. 2010-102225).

<Second Embodiment>
FIG. 4 is a cross-sectional view of a mold used in the method for producing a glass molded body according to the second embodiment of the present invention, and FIG. 5 is a cross-sectional view showing a divided state of the mold of FIG. Moreover, FIG. 6 is a figure which shows the process of the manufacturing method of the glass forming body which concerns on this embodiment. This embodiment is different from the first embodiment in the structure of the outer peripheral portion 10A.

  As shown in FIGS. 4 and 5, the outer peripheral portion 10A can be divided into two or more split molds 10a and 10b. Each of the split molds 10a and 10b has divided split surfaces 11a and 11b, split inner walls 13a and 13b, and split lower surfaces 15a and 15b. 15 is formed.

  As FIG. 6 shows, the 1st fitting part 20 is fitted to the outer peripheral part 10A which united the split molds 10a and 10b in the contact surface 14, and the receiving surface 30 is formed (AB), Molten glass MG is supplied from the supply pipe 50 to the receiving surface 30 to form a molten glass lump GG on the receiving surface 30 (C to D). It is the contact surface 14 in addition to the boundary 31 that easily causes irregularities in the molten glass lump in this process.

  However, the portion facing the contact surface 14 in the molten glass lump GG is generally an outer portion that does not become a functional surface in the glass molded body GM. For this reason, even if unevenness occurs in the molten glass lump GG, it is unlikely to be a problem, and it is not necessary to excessively increase the accuracy of combining the split molds 10a and 10b, and the equipment for improving the accuracy can be simplified. Further, the necessity of setting the contact surface 14 to a position where the center of the surface 11 is removed (for example, JP 2009-286679 A) is small.

  Next, the first fitting portion 20 is removed from the outer peripheral portion 10A (FIG. 6E), and the outer peripheral portion 10A is divided into split molds 10a and 10b above the lower molding surface 63 of the lower mold 61, thereby The molten glass lump GG on the portion 10A is dropped onto the lower molding surface 63 (FIG. 6F). And the molten glass lump GG is shape | molded into the glass molded object GM by making the lower mold | type 61 and the upper mold | type 65 which has the upper shaping | molding surface 67 approach and press.

10, 10A Outer peripheral portion 10a, 10b Split mold 11 surface 13 inner wall 14 contact surface 15 lower surface 20 first fitting portion 21 surface 23 side portion 24 surface forming body 25 flange portion 30 receiving surface 30 'molding surface 31 boundary 40 second Fitting portion 41 surface 43 side portion 44 surface forming body 45 collar portion 50 supply pipe 61 lower mold 63 lower molding surface 65 upper mold 67 upper molding surface MG molten glass GG molten glass lump GM glass molded body

Claims (15)

A method for producing a glass molded body, comprising:
A first fitting portion including a surface constituting a part of a receiving surface for receiving molten glass is fitted to an outer peripheral portion including a surface constituting another portion of the receiving surface, thereby forming the receiving surface,
Supplying molten glass to the receiving surface, forming a molten glass lump on the receiving surface;
The first fitting portion is removed from the outer peripheral portion, the molten glass lump on the outer peripheral portion is disposed on a molding surface different from the receiving surface,
The manufacturing method of the glass forming body which has the process of shape | molding the said molten glass lump into a glass forming body on the said shaping | molding surface.   The manufacturing method of Claim 1 which makes a part of said receiving surface oppose the part used as the functional surface of a glass molded object among molten glass lump.   The manufacturing method according to claim 1 or 2, wherein a boundary between a part of the receiving surface and another part is opposed to a part of the molten glass lump that does not become a functional surface of the glass molded body.   The molten glass block is formed by fitting a second fitting portion including a surface constituting a part of the molding surface to the outer peripheral portion after removing the first fitting portion to form the molding surface. The manufacturing method of any one of Claim 1 to 3 arrange | positioned on the said molding surface. As the outer peripheral portion, one that can be divided into two or more split molds,
The manufacturing method according to any one of claims 1 to 3, wherein the molten glass lump on the outer peripheral portion is dropped onto the forming surface by dividing the outer peripheral portion into a split mold above the forming surface.   Manufacturing of an optical element for manufacturing an optical element by transferring the glass molded body manufactured by the manufacturing method according to any one of claims 1 to 5 to a mold for press molding and performing press molding with the mold for press molding. Method.   The said glass molded object is a manufacturing method of Claim 6 performed in the state which hold | maintained the said glass molded object on the said outer peripheral part.   The manufacturing method according to claim 6 or 7, wherein a lens with a lens barrel in which an optical lens is fixed to the lens barrel is manufactured as an optical element by press molding the glass molded body using a lens barrel as the outer peripheral portion.   9. The method according to claim 6, further comprising a step of holding the optical element after press molding on the outer peripheral portion and cooling and packing the optical element while maintaining a state in which the functional surface is not in contact with another object. Manufacturing method.   The manufacturing method according to claim 9, wherein packing of the optical element is performed using the outer peripheral portion as a container.   The manufacturing method of the optical instrument which manufactures an optical instrument using the optical element manufactured with the manufacturing method in any one of Claim 6 to 10. A glass molding die comprising a mold base material having a placement surface on which a glass lump is placed,
The mold base material has a fitting portion including a surface constituting a part of the placement surface, and an outer peripheral portion including a surface surrounding the fitting portion and constituting the other portion of the placement surface,
A glass molding die in which the fitting portion is detachably fitted to the outer peripheral portion to form the placement surface.   The glass mold according to claim 12, wherein a part of the placement surface includes a center of the receiving surface.   The glass mold according to claim 12 or 13, wherein the outer peripheral portion can be divided into two or more split molds. A glass mold part used as a fitting portion in the glass mold according to any one of claims 12 to 14,
Comprising a surface constituting a part of the mounting surface,
A glass mold part that is detachably fitted to the outer peripheral portion to form the placement surface.

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