WO2013133190A1 - Dispositif de moulage par pressage, et procédé de fabrication d'élément optique - Google Patents

Dispositif de moulage par pressage, et procédé de fabrication d'élément optique Download PDF

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Publication number
WO2013133190A1
WO2013133190A1 PCT/JP2013/055780 JP2013055780W WO2013133190A1 WO 2013133190 A1 WO2013133190 A1 WO 2013133190A1 JP 2013055780 W JP2013055780 W JP 2013055780W WO 2013133190 A1 WO2013133190 A1 WO 2013133190A1
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WO
WIPO (PCT)
Prior art keywords
mold
molding
rolling elements
holes
plate
Prior art date
Application number
PCT/JP2013/055780
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English (en)
Japanese (ja)
Inventor
英邦 浅井
剛志 石嶺
清鐘 山崎
泰匡 和田
藤本　忠幸
Original Assignee
Hoya株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoya株式会社 filed Critical Hoya株式会社
Priority to CN201380012535.4A priority Critical patent/CN104144892A/zh
Publication of WO2013133190A1 publication Critical patent/WO2013133190A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/02—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing in machines with rotary tables
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/50—Structural details of the press-mould assembly
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to a mold press molding apparatus that press-molds a molding material such as glass with a precision-processed mold and manufactures an optical element such as a glass lens, and an optical element manufacturing method.
  • an optical glass material is accommodated in a mold that has been precisely machined to a predetermined surface accuracy, and the molded surface is ground by pressing it under heat and transferring the molded surface.
  • a method of manufacturing an optical element such as a glass lens having a high-precision optical functional surface that does not require post-processing such as polishing.
  • Patent Document 1 discloses glass in which processing chambers such as a heating chamber, a press chamber, and a cooling chamber are arranged side by side in a circumferential direction, and molding molds containing molding materials are sequentially transferred in these processing chambers.
  • An apparatus for manufacturing a molded body is disclosed.
  • each processing chamber is formed by being surrounded by a case in a furnace body, and a sample table is installed on a rotary table provided so as to be intermittently rotatable around a central rotary shaft.
  • the glass mold is continuously formed by moving the processing molds placed on the sample stage to the processing chambers as the rotary table rotates.
  • Patent Document 2 discloses a die moving type press molding machine that sequentially transfers molding dies to a press machine in which a heating stage, a pressure stage, and a cooling stage are arranged to perform a predetermined operation in each stage. It is disclosed.
  • the molding die is transferred to the subsequent stage by the die feeding arm without being transferred or variously processed in a state where the molding die is placed on the support base, and is provided on the heater block.
  • Various types of processing are executed by directly placing the mold on the soaking plate.
  • Patent Document 3 discloses a glass lens molding apparatus that does not transfer a molding die in a molding machine, and supports the molding die with three protrusions provided on a fixed portion of the molding machine, and is close to the molding die.
  • An apparatus is disclosed in which a glass lens having a predetermined shape is formed by performing various treatments using a pressurizing unit, a heating unit, and a cooling unit.
  • Patent Document 4 a plurality of rolling members are disposed between the lower mold and the lower mold holding member, so that when the lower mold is inserted into the body mold prepared on the fixed shaft side, There has been disclosed a mold press mold that facilitates smooth movement of the mold in the horizontal direction and can smoothly insert the lower mold into the body mold to enhance the coaxiality of the upper mold and the lower mold.
  • the apparatus of Patent Document 1 can independently and precisely control the temperature management of each processing chamber, and can prevent temperature fluctuations associated with the transfer of the mold.
  • the molding material is displaced in the molding die due to vibration during transfer, the optical element to be molded becomes uneven, resulting in a defective shape as well as due to uneven thickness.
  • the surface accuracy of the optical functional surface is deteriorated due to nonuniformity of the press load application, according to the apparatus of Patent Document 1, the mold can be smoothly transferred by the rotary table without causing vibration to the mold. it can.
  • the apparatus of Patent Document 1 has a very excellent function in manufacturing an optical element having a high-precision optical function surface.
  • optical devices used for imaging devices such as digital cameras and interchangeable lenses have extremely high optical performance requirements.
  • the temperature control in each processing step of the molding process particularly the temperature management of the mold that accommodates the molding material is elaborated.
  • the apparatus of Patent Document 1 is applied as it is, there has been a concern that when more precise temperature control of the mold is required, this cannot be met.
  • the posture of the molding die can be uniquely determined by supporting the molding die with three projections provided on the fixing portion of the molding machine, and at the time of heating and cooling of the molding die.
  • the press load of several tens to several hundred kgf is always received at the same three points, the protrusions are deformed when the number of presses is increased, and the mold is tilted at the beginning of pressing, for example, the mold is tilted. There is a fear.
  • the lower mold is heated by receiving heat from the lower mold holding member that is induction-heated by the mold heating apparatus. For this reason, by disposing a plurality of rolling members between the lower mold and the lower mold holding member, the horizontal mold can move smoothly in the horizontal direction, but the heating efficiency of the lower mold is deteriorated. End up.
  • the present invention has been made in view of the above points, and by pressing a molding material softened by heating the molding die while supporting the molding die containing the molding material with a support base, In the production of optical elements, the thermal influence of the support that supports the mold is suppressed from affecting the mold, and high-precision optical elements are stably mass-produced by controlling the mold temperature more precisely.
  • An object of the present invention is to provide a mold press molding apparatus and an optical element manufacturing method.
  • the mold press molding apparatus of the present invention is a mold press molding apparatus that press-molds a molding material softened by heating the molding die while supporting the molding die containing the molding material on a support base, and has a plurality of holes And at least a plurality of rolling elements capable of rolling in the plurality of holes, each of the plurality of rolling elements from the plurality of holes being part of the plate-like member.
  • the optical element manufacturing method of the present invention is suitable for manufacturing an optical element by press-molding a molding material softened by heating the molding die while supporting the molding die containing the molding material on a support base.
  • a unit including at least a plate-like member in which a plurality of holes are formed and a plurality of rolling elements capable of rolling in the plurality of holes, each part of the plurality of rolling elements from the plurality of holes.
  • the lower surface of the molding die is supported by a plurality of rolling elements by supporting the molding die on a support base via a pedestal unit in which a plurality of rolling elements are accommodated in a plurality of holes so as to protrude from the surface of the plate-like member.
  • the present invention it is possible to suppress the thermal influence of the support base that supports the molding die on the molding die, and more precisely control the temperature of the molding die. It can be mass-produced stably.
  • FIG. 1 It is a schematic plan view which shows embodiment of the mold press molding apparatus which concerns on embodiment of this invention. It is explanatory drawing inside the apparatus equivalent to the AA cross section of FIG. It is explanatory drawing which shows one Embodiment of the base unit which concerns on embodiment of this invention. It is a principal part expanded sectional view which expands and shows a part of FIG. It is explanatory drawing which shows the other example of the base unit which concerns on embodiment of this invention. It is a distribution map which shows the result of having measured the shape error of the surrounding area with respect to the reference
  • FIG. 6 is a histogram of the embodiment, in which the shape error of the peripheral region with respect to the reference shape is plotted on the horizontal axis and the frequency is plotted on the vertical axis. It is a distribution map which shows the result of having measured the shape error of the peripheral area with respect to the reference
  • the horizontal axis represents the shape error of the peripheral region with respect to the reference shape
  • the vertical axis represents the frequency.
  • FIG. 1 is a schematic plan view showing an embodiment of a mold press molding apparatus (hereinafter simply referred to as “molding apparatus”) according to an embodiment of the present invention
  • FIG. 2 corresponds to a cross section taken along line AA of FIG. It is explanatory drawing inside an apparatus.
  • the molding apparatus presses the molding material P softened by heating the molding die M while supporting the molding die M containing the molding material P such as a glass preform with the support base 3. In order to obtain a molded body such as an optical element molded into a desired shape.
  • the specific configuration of the mold M used in the present embodiment is not particularly limited as long as the molding material P can be press-molded into a desired shape.
  • the mold M includes a pair of an upper mold 10 and a lower mold 20 on which molding surfaces facing each other are formed, and a body mold 30 that regulates the mutual position of the upper mold 10 and the lower mold 20 in the horizontal direction. It's okay.
  • a molding die M By using such a molding die M, a molding material is formed between the lower die 20 and the upper die 10 that is slidably guided by the barrel die 30 so as to be relatively close to and away from the lower die 20. P can be press-molded.
  • the molding apparatus of the present embodiment transfers a plurality of processing chambers for performing processing including heating, pressing, and cooling to the mold M, and a support base 3 that supports the mold M to each processing chamber.
  • the press molding is performed by sequentially performing each process such as a heating process, a pressing process, and a cooling process while transporting the molding die M in which the molding material P is accommodated. Can be.
  • the chamber 1 is formed using stainless steel or other heat-resistant metal. For example, a cylindrical upper and lower openings are sealed to form a non-oxidizing gas atmosphere (inert such as nitrogen). It has an airtight structure that can be maintained in a gas atmosphere.
  • a non-oxidizing gas atmosphere in the chamber 1, there are provided take-out / insertion chambers P1 and processing chambers P2 to P8, which are arranged at almost equal intervals along the circumferential direction.
  • P1 is an extraction / insertion chamber.
  • the molding environment for setting the processing chambers P2 to P8 is not impaired, and a molding die containing the molding material P to be newly molded and a molding material P to be newly molded are accommodated. M is inserted.
  • P2 is a first heating chamber
  • P3 is a second heating chamber
  • P4 is a third heating chamber (or soaking chamber). These are also collectively referred to as a heating unit
  • the heat treatment here is performed so that the mold M and the molding material P reach a temperature suitable for press molding, for example, a temperature corresponding to a glass viscosity of 10 6 to 10 11 dPa ⁇ s.
  • P5 is a press room. In the press chamber P5, a press process for applying a press load by a press mechanism is performed on the mold M that has a temperature suitable for press molding by the heat treatment in the heating unit.
  • P6 is a first annealing chamber
  • P7 is a second annealing chamber
  • P8 is a quenching chamber.
  • the quenching chamber P8 is preferably provided with a quenching mechanism using a cooling gas, and the molded body formed into a desired shape by press-molding the molding material P has a temperature that does not hinder the opening to the atmosphere, for example, glass viscosity.
  • the mold M is cooled until the temperature becomes equal to or lower than the temperature corresponding to 10 12 dPa ⁇ s.
  • process chambers P2 to P8 are independently controlled to temperatures suitable for the respective processes, and are partitioned by shutters S1 to S6 in order to keep the temperature in each process chamber at a predetermined temperature.
  • a support base 3 that supports and transfers the mold M is attached to a turntable 2 as a transfer mechanism that is connected to a rotation drive mechanism that rotates in the direction of the arrow in FIG. Accordingly, the molding die M inserted into the apparatus from the take-out / insertion chamber P1 and supported by the support base 3 is always in a non-oxidizing gas atmosphere (nitrogen) in a state in which the molding material (or molded body) P is accommodated. Etc.) are sequentially transferred to the processing chambers P2 to P8 which are set under an inert gas atmosphere).
  • the turntable 2 has a disk shape with a diameter smaller than the inner diameter of the chamber 1 and is rotatably attached to the chamber 1 so that the center of rotation coincides with the center of the chamber 1.
  • the rotary table 2 is provided with a control mechanism (not shown) having an index machine in the center, and the rotary table 2 repeats rotation and stop at regular intervals to rotate intermittently by a predetermined rotation angle.
  • the support base 3 that supports the mold M is moved between adjacent processing chambers.
  • the fixed time at this time that is, the time from when the support base 3 starts to move due to intermittent rotation of the turntable 2 until the next movement is started is the molding cycle time. It becomes.
  • the transfer mechanism for transferring the support base 3 is configured to be connected to a known drive mechanism mainly for linear operation.
  • the specific configuration is not particularly limited.
  • the arrangement of the take-out / insertion chamber P1 and the processing chambers P2 to P8 is not limited to the illustrated example, and can be variously changed according to the configuration of the transfer mechanism for transferring the support base 3.
  • the first heating chamber P2, the second heating chamber P3, the third heating chamber P4, the press chamber P5, the first annealing chamber P6, and the second annealing chamber P7 are treated by a case 7, respectively.
  • the case 7 is fixed to the chamber 1 by an appropriate means (not shown).
  • the bottom wall 7a of the case 7 is formed with a slit 7b extending in the circumferential direction that serves as a movement path of the support base 3 when the mold M is transferred, and passes through the slit 7b.
  • the support table 3 enters each processing chamber.
  • FIG. 2 shows the inside of the first heating chamber P2 as a representative, but the second heating chamber P3, the third heating chamber P4, the first annealing chamber P6, and the second annealing chamber P7 are: Only the set temperature is different and the first heating chamber P2 can have a common structure.
  • the press chamber P5 can also have a common structure with other processing chambers except that it includes a press mechanism.
  • a heating unit 8 is installed so as to face the transfer path of the mold M and to face each other.
  • the temperatures of the processing chambers P2 to P7 are maintained at the respective set temperatures by controlling the output of the heating unit 8.
  • a thermocouple is disposed at the tip of the support base 3, and the lead wires are connected to the turntable 2.
  • the temperature of the tip of the support base 3, that is, the bottom of the mold M is measured, and the output of the heating unit 8 installed in each processing chamber is controlled based on the measurement result. Can do.
  • the specific configuration of the heating unit 8 is not particularly limited, and for example, a resistance heater that emits radiant heat can be used.
  • a resistance heater that emits radiant heat
  • the strip-like resistance heating heating element is attached almost symmetrically to the opposite side surfaces while meandering several times in the vertical direction along the inner side surface of the case 7. Is preferred.
  • a reflector 9 that covers the inner surface of the case 7 is disposed in the case 7 so as to reflect the radiant heat emitted from the heating unit 8 and efficiently apply the radiant heat to the mold M. It is preferable to keep it.
  • the support 3 for supporting the forming mold M and transferring the forming mold M to each processing chamber where heat treatment, press processing, and cooling processing are performed is a hollow cylindrical shape that stands vertically.
  • the upright part 3b is provided.
  • the support 3 is attached to the turntable 2 by fitting a base 3 c provided on the lower end side of the upright portion 3 b into a hole 2 a formed on the outer peripheral side of the turntable 2.
  • a mold support portion 3a for supporting the molding die M is provided on the upper end side of the upright portion 3b, and the mold support portion 3a includes a plurality of pins for preventing the molding die M from falling over as shown in the figure. 6 is preferably provided.
  • the support base 3 is provided with a plurality of upright portions 3b with respect to one base portion 3c, and the mold support portion 3a provided on the upper end side of each upright portion 3b supports the molding die M to perform heat treatment.
  • the plurality of molding dies M can be moved together in each processing chamber where the pressing process and the cooling process are performed. By doing so, it is possible to simultaneously transfer a plurality of molding dies M to each processing chamber, arrange a plurality of molding dies M in one processing chamber, and perform the same process at the same time. Production efficiency can be improved.
  • such a support base 3 moves through each processing chamber where heat treatment, press treatment, and cooling treatment are performed in a state where the mold M is supported, is heated together with the mold M, and is pressed to the mold M.
  • the support base 3 is normally formed using metal materials, such as stainless steel which has the intensity
  • the mold M is typically represented by ceramics such as silicon carbide and silicon nitride, cemented carbide such as tungsten carbide, etc., because it is necessary to have characteristics such as predetermined hardness, low thermal expansion, and denseness.
  • ceramic materials have higher thermal conductivity than metal materials such as stainless steel.
  • the mold M has a relatively higher thermal conductivity than the support 3, and as it moves through the processing chambers where heat treatment, press treatment, and cooling treatment are performed, its thermal environment Due to the change, heat exchange occurs between the mold M and the support 3.
  • the temperature of the mold M is higher than that of the support base 3, but the temperature of the mold M increases as the temperature of the mold M becomes higher than the temperature of the support base 3. Heat transfer from M to the support base 3 having a low temperature occurs.
  • the mold M is easier to cool than the support table 3, but as the temperature of the mold M becomes lower than the temperature of the support table 3, Heat transfer to the mold M having a low temperature occurs.
  • the plurality of support tables 3 that support the mold M and transfer it to the processing chambers have their thermal characteristics due to slight differences in thickness and shape, partial thermal deterioration that occurs over time, and the like. It must also be taken into account that there are variations. If the support table 3 has such a variation in thermal characteristics, the heat exchange with the mold M is not constant, and the optical element such as a glass lens has high shape reproducibility and high accuracy. There is also concern that it will be an obstacle to mass production.
  • the mold M is adhered to the support table 3 after being subjected to press molding by applying a predetermined press load to the mold M, and the mold There is also a concern that it may be difficult to remove M from the support 3.
  • FIG. 3 is an explanatory view showing an embodiment of the pedestal unit 5
  • FIG. 3 (a) is a plan view of the pedestal unit 5
  • FIG. 3 (b) is B in FIG. 3 (a).
  • the pedestal unit 5 in this embodiment includes a disc-shaped receiving plate 51, a plate-like member 52 in which a plurality of holes 52a are formed, and each hole 52a formed in the plate-like member 52. And a rolling element 53 held so as to be capable of rolling therein.
  • the receiving plate 51 and the plate-like member 52 are coupled by, for example, press-fitting, welding, screwing or the like in a state where the rolling elements 53 are accommodated in the respective holes 52 a formed in the plate-like member 52.
  • the rolling element 53 it is preferable to use a true spherical member having a diameter of 0.5 to 10 mm.
  • the plate-like member 52 can also be referred to as a holding plate, and the hole 52a can also be referred to as a holding hole.
  • the hole 52a formed in the plate-like member 52 is formed so as to penetrate in the thickness direction of the plate-like member 52, but is slightly smaller than the diameter of the rolling element 53 so that the rolling element 53 can be held to roll.
  • the inner diameter is large.
  • the part opened to the surface side of the plate-shaped member 52 is from the diameter of the rolling element 53 so that a part of the accommodated rolling element 53 protrudes on the surface of the plate-shaped member 52 and does not detach
  • the diameter is also reduced so as to be smaller (see FIG. 3B).
  • the thickness of the plate-like member 52 is made slightly smaller than the diameter of the rolling element 53 and is less than the radius of the rolling element 53, preferably at a height of 0.1 to 2 mm.
  • the shape and dimensions of each part are appropriately set so that a part of the rolling element 53 protrudes from the surface.
  • the rolling element 53 protruding from the surface of the plate-like member 52 directly supports the lower surface of the mold M substantially in point contact. That is, it will be supported in a point contact manner, and the contact area can be reduced. Thereby, heat exchange between the mold M and the support table 3 is suppressed so that the thermal influence of the support table 3 does not reach the mold M, and the support table 3 and the mold M are attached to each other. It is possible to prevent sticking from occurring.
  • the height protruding from the surface of the plate-like member 52 cannot be sufficiently secured, and heat exchange between the mold M and the support base 3 cannot be effectively suppressed.
  • the diameter of the rolling elements 53 is too large, the number of the rolling elements 53 included in the pedestal unit 5 cannot be made sufficient, and when a press load is applied, the load on the individual rolling elements 53 is increased. There is a possibility that the rolling element 53 may be damaged due to being too large.
  • the rolling element 53 by holding the rolling element 53 so as to be able to roll, uneven wear of the rolling element 53 can be suppressed, the service life thereof can be extended, and the pedestal unit 5 can be used over a long period of time.
  • the rolling element 53 held by the plate-like member 52 is only allowed to roll in the hole 52a and cannot move freely. Even if the support surface is inclined with respect to the horizontal plane, the rolling elements 53 do not roll and are unevenly distributed at a certain place. Thereby, a molded object can always be supported equally, without the attitude
  • the holes 52a that hold the rolling elements 53 so as to be able to roll are formed in the plate-like member 52 in an approximately equal pitch arrangement without being partially unevenly distributed. Is preferred.
  • the arrangement of the holes 52a is not limited to the staggered arrangement shown in the figure, and may be, for example, a lattice, concentric, or radial arrangement.
  • the number of holes 52a that is, the number of rolling elements 53 is appropriately set from the viewpoint of suppressing heat exchange between the mold M and the support third, and temporarily, the number of holes 52a is extremely increased.
  • the number of holes 52a that is, the number of rolling elements 53
  • the number N of rolling elements 53 is preferably 60 or less from the above equation (1). If the number N of rolling elements 53 is increased so that the value of Pmax / N is less than 5 kgf, heat exchange between the mold M and the support base 3 is likely to occur, and precise temperature management of the mold M becomes difficult. On the other hand, when the value of Pmax / N exceeds 20 kgf, the load on each rolling element 53 becomes too large, and the rolling element 53 or the receiving plate 51 may be damaged or deformed, and a desired effect may not be obtained. is there.
  • the hole 52a for holding the rolling element 53 so as to be able to roll is provided as a plate-like member.
  • the total area of the holes 52a (the area of the portion excluding the reduced diameter opening portion)
  • the surface area of the plate-like member 52 is S
  • the total area Sa of the holes 52 a is 200 ⁇ mm 2 or less from the above equation (2). It is preferable to set the number of holes 52 a formed in the plate-like member 52 so that When the holes 52a are formed in such a number that the total area Sa of the holes 52a exceeds half of the area S of the surface of the plate-like member 52, the number of rolling elements 53 accommodated in the mold 52 and abutted against the mold M increases. In addition, heat exchange between the mold M and the support 3 is likely to occur, and precise temperature management of the mold M becomes difficult.
  • the rolling elements 53 can be arbitrarily thinned out (the rolling elements 53 are omitted at a predetermined interval) as needed without being accommodated in all the holes 52a formed in the plate-like member 52.
  • the number of rolling elements 53 may be thinned to reduce the number thereof. it can.
  • the mold M is also large, so that the temperature distribution in one mold M is likely to occur, but the rolling element 53 in a high temperature region.
  • the temperature distribution of the mold M can be adjusted and reduced.
  • the number of rolling elements 53 provided in the pedestal unit 5 takes into consideration the fact that heat exchange between the mold M and the support base 3 can be effectively suppressed and the press load applied during the pressing process. More specifically, the number of rolling elements 53 having a diameter of 0.5 mm to 5 mm is preferably 30 to 80.
  • the receiving plate 51 and the plate-like member 52 forming the pedestal unit 5 can be formed using an alloy having high hardness and high heat resistance such as tungsten alloy, tungsten carbide, titanium carbide, cermet, and the like.
  • the receiving plate 51 is preferably made of a material having high hardness so that it does not deform or break even if it receives a press load of several tens to several hundreds kgf through the rolling elements 53.
  • the rolling element 53 is made of a material having a high hardness such as silicon nitride, silicon carbide, zirconia, alumina so as not to be deformed or damaged even when a press load of several tens to several hundreds kgf is applied. It can be formed using a material having high hardness and high heat resistance such as ceramics such as tungsten alloy, tungsten carbide, titanium carbide, and cermet.
  • a pedestal unit 5 as shown in FIG. 3 is arranged on the mold support portion 3a of the support base 3, and molding is performed in the take-out / insertion chamber P1.
  • An operation for taking out the finished mold M and an insertion operation for carrying the mold M containing the molding material P newly used for molding into the molding apparatus were performed.
  • the mold M was supported by the mold support portion 3 a of the support base 3 via the pedestal unit 5.
  • press molding was repeatedly performed through various processes of heating, pressing, and cooling while sequentially transferring the molding die M to the processing chambers P2 to P8.
  • a concave meniscus lens having a press diameter of 33 mm, a center thickness of 1.3 mm, and a peripheral thickness of 8 mm was continuously molded.
  • the pedestal unit 5 has an outer diameter of 50 mm, a combined thickness of the receiving plate 51 and the plate-like member 52 of 4 mm, 40 holes 52a, and carbide rolling elements 53 disposed in the holes 52a. The one with a diameter of 2 mm was used.
  • FIG. 6 shows the result of measuring the shape error of the peripheral region with respect to the reference shape (hereinafter referred to as “periphery F ′”) for each of the five support bases for the molded glass lens.
  • FIG. 7 shows a histogram in which the peripheral F ′ is on the horizontal axis and the frequency is on the vertical axis.
  • FIG. 8 shows the result of measuring the peripheral F ′ for each of the five support bases 3 for the molded glass lens.
  • FIG. 9 shows a histogram in which the peripheral F ′ is on the horizontal axis and the frequency is on the vertical axis.
  • the error was improved and the variation could be reduced.
  • maintained so that rolling is possible in the hole 52a is shown as the base unit 5.
  • the receiving plate 51 may be omitted.
  • the mold support 3 a provided on the support 3 can have the function of the receiving plate 51.
  • 5 is an explanatory view showing another example of the pedestal unit 5, and is an enlarged cross-sectional view of a main part corresponding to FIG.
  • the same components as those in the example shown in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • a mold press provided with a plurality of processing chambers for performing each process including heating, pressing, and cooling, and a transfer mechanism for sequentially transferring the support base 3 supporting the mold M to these processing chambers.
  • the present invention relates to a mold press molding apparatus for press-molding a molding material P softened by heating the molding die M while supporting the molding die M containing the molding material P on the support base 3, and a method for manufacturing an optical element. It is applicable to.
  • the present invention is not limited to a concave meniscus lens, and presses optical elements of various shapes such as a biconvex lens, a convex meniscus lens, and a biconcave lens. Applicable when molding.
  • the temperature distribution in the molding surface can be suppressed and the temperature of the molding die M can be controlled more precisely by applying the present invention. Therefore, high-precision optical elements can be stably mass-produced.
  • the mold press molding apparatus is a mold press molding apparatus that press-molds a molding material P softened by heating the molding die M while supporting the molding die M containing the molding material P with the support 3.
  • the unit includes at least a plate-like member 52 in which a plurality of holes 52a are formed and a plurality of rolling elements 53 capable of rolling in the plurality of holes 52a.
  • the mold M is placed on the support base 3 via the pedestal unit 5 in which the plurality of rolling elements 53 are accommodated in the plurality of holes 52a so that each of the rolling elements 53 protrudes from the surface of the plate-like member 52.
  • the plurality of rolling elements 53 each support the lower surface of the molding die M in a point contact manner.
  • the pedestal unit 5 includes a receiving plate 51 coupled to the plate-like member 52, and the rolling member 53 is accommodated in the hole 52a. 51 is preferably bonded.
  • the mold press molding apparatus includes a plurality of processing chambers (P2 to P8) for performing processing including heating, pressing, and cooling on the mold M, and a support that supports the mold M. It is preferable that the apparatus includes a transfer mechanism (rotary table 2) that sequentially transfers the table 3 to each processing chamber.
  • the manufacturing method of the optical element press-molds the molding material P softened by heating the molding die M while supporting the molding die M containing the molding material P with the support base 3.
  • the unit includes at least a plate-like member 52 in which a plurality of holes 52a are formed and a plurality of rolling elements 53 that can roll in the plurality of holes 52a.
  • the mold M is formed via the pedestal unit 5 in which the plurality of rolling elements 53 are accommodated in the plurality of holes 52a so that a part of each of the plurality of rolling elements 53 protrudes from the surface of the plate-like member 52 from 52a.
  • the several rolling element 53 supports the lower surface of the shaping
  • the pedestal unit 5 includes a receiving plate 51 coupled to the plate-like member 52, and the rolling member 53 is accommodated in the plurality of holes 52a.
  • 51 is a method for manufacturing an optical element.
  • the method for manufacturing an optical element according to the present embodiment can also adjust and reduce the temperature distribution of the mold M by thinning out a part of the plurality of rolling elements 53 accommodated in the pedestal unit 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

L'invention concerne une unité équipée au moins : d'un élément sous forme de plaque (52) dans lequel est formée une pluralité de trous (52a); et d'une pluralité de corps roulant (53) capables de rouler à l'intérieur de la pluralité de trous (52a). Une matrice de moulage (M) est supportée sur une plateforme de support (3) avec pour intermédiaire une unité base (5) admettant la pluralité de corps roulant (53) à l'intérieur de la pluralité de trous (52a), de sorte qu'une partie de chacun des corps roulant (53) forme une saillie à la surface de l'élément sous forme de plaque (52) depuis la pluralité de trous (52a). Ainsi, chacun des corps roulant (53) supportent à la façon de points de contact la face inférieure de la matrice de moulage (M). Par conséquent, un échange de chaleur entre la matrice de moulage (M) et la plateforme de support (3) est inhibé, et sans que la matrice de moulage (M) ne subisse l'influence thermique de la plateforme de support (3), il est possible d'empêcher un risque de collage entre la plateforme de support (3) et la matrice de moulage (M).
PCT/JP2013/055780 2012-03-05 2013-03-04 Dispositif de moulage par pressage, et procédé de fabrication d'élément optique WO2013133190A1 (fr)

Priority Applications (1)

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CN201380012535.4A CN104144892A (zh) 2012-03-05 2013-03-04 模具冲压成型装置和光学元件的制造方法

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JP2012048417A JP5883317B2 (ja) 2012-03-05 2012-03-05 モールドプレス成形装置、及び光学素子の製造方法
JP2012-048417 2012-03-05

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WO2014192727A1 (fr) * 2013-05-29 2014-12-04 Hoya株式会社 Appareil de production de corps moulé en verre et procédé de production de corps moulé en verre
WO2015146399A1 (fr) * 2014-03-28 2015-10-01 Hoya株式会社 Dispositif de production de corps moulés en verre, et procédé de production de corps moulés en verre

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CN109534660B (zh) * 2019-01-10 2023-09-08 亚琛科技(深圳)有限公司 一种用于玻璃模压机的加热施压轴结构

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KR100839731B1 (ko) * 2005-01-19 2008-06-19 호야 가부시키가이샤 몰드 프레스 성형 몰드 및 광학소자의 제조방법
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JPH05286728A (ja) * 1992-04-03 1993-11-02 Olympus Optical Co Ltd ガラスレンズの製造方法
WO2008053860A1 (fr) * 2006-10-31 2008-05-08 Hoya Corporation Filière de formage sous presse de moule et procédé de fabrication d'article moulé

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WO2015146399A1 (fr) * 2014-03-28 2015-10-01 Hoya株式会社 Dispositif de production de corps moulés en verre, et procédé de production de corps moulés en verre

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CN104144892A (zh) 2014-11-12
JP2013184829A (ja) 2013-09-19
TWI619595B (zh) 2018-04-01
TW201347947A (zh) 2013-12-01
JP5883317B2 (ja) 2016-03-15

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