WO2013047306A1 - プレス成形装置、プレス成形方法、プレス成形用の載置板 - Google Patents
プレス成形装置、プレス成形方法、プレス成形用の載置板 Download PDFInfo
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- WO2013047306A1 WO2013047306A1 PCT/JP2012/074007 JP2012074007W WO2013047306A1 WO 2013047306 A1 WO2013047306 A1 WO 2013047306A1 JP 2012074007 W JP2012074007 W JP 2012074007W WO 2013047306 A1 WO2013047306 A1 WO 2013047306A1
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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
- C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
- C03B11/122—Heating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
- C03B35/142—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by travelling transporting tables
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/02—Press-mould materials
- C03B2215/05—Press-mould die materials
- C03B2215/06—Metals or alloys
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/40—Product characteristics
- C03B2215/44—Flat, parallel-faced disc or plate products
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/80—Simultaneous pressing of multiple products; Multiple parallel moulds
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2225/00—Transporting hot glass sheets during their manufacture
Definitions
- the present invention relates to glass press molding, and more particularly, to a glass press molding apparatus, a press molding method, and a mounting plate for press molding used as a cover glass of a portable terminal.
- Patent Document 1 As a method suitable for mass production, there is a method in which the glass is heated to a desired temperature and the heated glass is pressed with a mold (for example, see Patent Document 1). In the method disclosed in Patent Document 1, after heating a plate glass to a predetermined temperature, the heated plate glass is conveyed to a press mechanism by a conveyance roller and press-molded.
- An object of the present invention is to provide a press molding apparatus, a press molding method, and a mounting plate for press molding capable of press molding glass having low viscosity.
- the press molding apparatus of the present invention is a press molding apparatus that press-molds a glass material, and a heating plate that heats the glass material on the mounting plate to a temperature at which the glass material on the mounting plate can be press-molded. And a mold for press-molding the glass material heated by the heating mechanism with the mounting plate.
- the heated glass material is press-formed with the placement plate, so that the glass having low viscosity is press-formed. be able to.
- the block diagram of the press molding apparatus which concerns on embodiment.
- the block diagram of a conveyance mechanism The figure which showed the heating surface of the heating mechanism.
- the block diagram of a press mechanism The block diagram of the press molding apparatus which concerns on other embodiment.
- FIG. 1 is a configuration diagram of a press forming apparatus 1 according to the embodiment.
- the press molding apparatus 1 includes a transport mechanism 10, a placement mechanism 20, a heating mechanism 30, a press mechanism 40, a slow cooling mechanism 50, and a take-out mechanism 60.
- FIG. 2 is a configuration diagram of the transport mechanism 10.
- FIG. 2A is a front view of the transport mechanism 10.
- FIG. 2B is a cross-sectional view taken along line XX in FIG.
- illustration of the drive means 14 is abbreviate
- the transport plate 11 also serves as a press molding die (lower mold), and has a size (for example, 300 mm long and 600 mm wide) that allows a plurality of glass molded products to be obtained by one press molding. It has become.
- the transport mechanism 10 mounts a transport plate (mounting plate) 11 that transports a glass material G that is the object of press molding, support members 12a and 12b that support both ends of the transport plate 11, and support members 12a and 12b.
- Guide rails 13a and 13b and driving means 14 for driving between the placing mechanism 20 and the take-out mechanism 60 are provided.
- the driving means 14 is, for example, a stepping motor.
- the conveyance plate 11 also serves as a lower mold of a mold used during press molding, wear resistance, heat resistance, strength, and the like are required. Moreover, since it is exposed to high temperature in air
- the press mechanism 40 cannot uniformly apply pressure to the glass material G to be press-molded, and transfer may be insufficient.
- the temperature of the conveying plate 11 is raised to about 1200 ° C. during press molding, in order to prevent the transfer from becoming insufficient due to the warping of the conveying plate 11, the material constituting the conveying plate 11
- the linear expansion coefficient is preferably 12 ⁇ 10 ⁇ 6 / K or less.
- Examples of materials having excellent wear resistance, heat resistance, strength, and the like and having a linear expansion coefficient of 12 ⁇ 10 ⁇ 6 / K or less include those shown in Table 1 below.
- the transport plate 11 has a certain size (area) in order to press-mold a plurality of molded products at a time.
- a thickness is also required to ensure strength sufficient to withstand press molding. In this case, if the entire conveying plate 11 is made of an expensive material, the manufacturing cost of the conveying plate 11 becomes very expensive.
- a base material 11a for example, graphite (C)
- a relatively inexpensive material is used for wear resistance, heat resistance, oxidation resistance.
- the conveyance board 11 is comprised by coat
- the film 11b for example, silicon carbide (SiC)
- the base material 11a becomes larger than the film 11b.
- the placement mechanism 20 places the glass material G on a predetermined position of the transport plate 11. Instead of providing the placement mechanism 20, the user or operator may place the glass material G on the transport plate 11.
- the heating mechanism 30 includes an upper heating means 31a and a lower heating means 31b arranged to face each other, and a driving means 32 for driving the upper heating means 31a in the vertical direction.
- the drive unit 32 is, for example, an air cylinder, and drives the upper heating unit 31a in the vertical direction (up and down direction) according to the thickness of the glass material G placed on the transport plate 11.
- FIG. 3 is a diagram showing the heating surfaces of the upper heating means 31a and the lower heating means 31b.
- FIG. 3A is a diagram showing the heating surface (lower surface) of the upper heating means 31a.
- the heating surface of the upper heating means 31a has an area that is the same as or slightly larger than that of the transport plate 11.
- the heating surface of the upper heating means 31a is divided into nine areas A to I (each area is indicated by a chain line). In each area A to I, a heating wire (not shown) for heating and a TC gauge (not shown) for temperature measurement are embedded, and independent temperature control (hereinafter, referred to as the area A to I). (It is described as temperature control).
- FIG. 3B is a view showing the heating surface (upper surface) of the lower heating means 31b.
- the heating surface of the lower heating means 31b also has an area that is the same as or slightly larger than that of the transport plate 11.
- the heating surface (upper surface) of the lower heating means 31b is also divided into nine areas A to I.
- Heating wires (not shown) for heating and TC gauges (not shown) for temperature measurement are embedded in each area A to I, and independent temperature control is possible for each area A to I. It has become.
- the heating wire is, for example, a nichrome wire (an alloy of nickel and chromium).
- the number of divisions of the heating surface of the upper heating means 31a and the lower heating means 31b is not limited to nine.
- the number of divided areas may be two.
- FIG. 4 is a configuration diagram of the press mechanism 40.
- the press mechanism 40 is provided on an upper die 41 for pressing the glass material G into a desired shape, an elevating means 42 for driving the transport plate 11 in the vertical direction (up and down direction), and an elevating means 42. And a soaking plate 43 that pushes up the transport plate 11 in contact with the lower surface of the transport plate 11.
- a plurality of cartridge heaters 41a capable of independently adjusting the temperature are embedded.
- a cavity (space) 41b for press-molding the glass material G into a desired shape is formed on the contact surface of the upper mold 41 with the glass material G.
- the elevating means 42 is, for example, an air cylinder, and drives a soaking plate 43 described later in the vertical direction (up and down direction) by high-pressure air supplied from outside.
- the soaking plate 43 is made of a material having high thermal conductivity, for example, stainless steel (SUS).
- a plurality of cartridge heaters 43a capable of adjusting the temperature independently of each other are embedded in the heat equalizing plate 43.
- the raising / lowering means 42 may be provided in the upper mold 41, and the upper mold 41 may be driven in the vertical direction (up and down direction) to press-mold the glass material G.
- the transport plate 11 when the temperature difference between the transport plate 11 and the soaking plate 43 is large, the transport plate 11 (particularly the coating film 11b) may be broken.
- the coating 11b of the transport plate 11 is silicon carbide (SiC)
- the coating 11b may be cracked due to thermal shock.
- the slow cooling mechanism 50 slowly cools the glass material G press-molded into a desired shape (for example, a cover glass of a portable device such as a smartphone or a tablet PC) to a desired temperature.
- a desired shape for example, a cover glass of a portable device such as a smartphone or a tablet PC
- the take-out mechanism 60 takes out the glass material G having a desired shape that has been slowly cooled by the slow cooling mechanism 50 from the transport plate 11. Instead of providing the take-out mechanism 60, the glass material G having a desired shape may be taken out from the transport plate 11 by the user or operator.
- the placement mechanism 20 places the glass material G that is the object of press molding on the transport plate 11.
- the drive unit 14 of the transport mechanism 10 transports the transport plate 11 to the position of the heating mechanism 30.
- the drive unit 14 of the transport mechanism 10 stops the transport plate 11 between the upper heating unit 31a and the lower heating unit 31b for a certain period of time.
- the glass material G and the conveying plate 11 are heated to a desired temperature by the upper heating means 31a and the lower heating means 31b.
- the driving means 14 of the transport mechanism 10 transports the transport plate 11 to the position of the press mechanism 40.
- the lifting means 42 of the press mechanism 40 pushes up the soaking plate 43.
- the soaking plate 43 is in contact with the lower surface of the transport plate 11 and pushes the transport plate 11 up to the upper mold 41.
- the glass material G on the transport plate 11 is press-formed into the shape of the cover glass C between the upper mold 41 of the press mechanism 40 and the transport plate 11. After press molding, the lifting means 42 lowers the transport plate 11. The transport plate 11 is placed on the support members 12a and 12b.
- the driving means 14 of the transport mechanism 10 transports the transport plate 11 to the position of the slow cooling mechanism 50.
- the drive unit 14 of the transport mechanism 10 stops the transport plate 11 within the slow cooling mechanism 50 for a certain period of time.
- the slow cooling mechanism 50 slowly cools the glass material G press-molded into a desired shape to a desired temperature.
- the driving means 14 of the transport mechanism 10 transports the transport plate 11 to the position of the take-out mechanism 60.
- the take-out mechanism 60 takes out the glass material G press-molded into a desired shape from the transport plate 11.
- the press molding apparatus 1 uses the transport plate 11 for transporting the glass material G, and press-molds the glass material G heated between the transport plate 11 and the upper mold 41. ing. For this reason, even glass with low viscosity (for example, glass having a viscosity ⁇ (Pa ⁇ s) of 1 ⁇ 10 4 or less) can be transported.
- glass with low viscosity for example, glass having a viscosity ⁇ (Pa ⁇ s) of 1 ⁇ 10 4 or less
- the viscosity range (working point) suitable for glass molding is about 10 2 to 10 6 (Pa ⁇ s), and the viscosity is very low.
- the glass in this viscosity range is quite fluid and cannot be transported as a single glass.
- the transport plate 11 is used for transporting the glass material G as described above. Since the glass material G heated between 11 and the upper mold 41 is press-molded, even such a low-viscosity glass can be easily press-molded.
- the press molding apparatus 1 can transport even low-viscosity glass. It is suitable for press molding of cover glass of portable devices such as.
- the heated glass material G is kept warm by the transport plate 11, it is possible to suppress the occurrence of problems during press molding due to temperature variations.
- the heating surfaces of the upper heating means 31a and the lower heating means 31b of the heating mechanism 30 can be divided into a plurality of areas A to I, and the temperature can be adjusted independently for each of the areas A to I. And the conveyance board 11 can be heated more uniformly. For this reason, generation
- the press mechanism 40 is provided with the soaking plate 43 that contacts the lower surface of the transport plate 11 and cools the transport plate 11, the cooling time of the glass material G after press molding can be shortened.
- FIG. 5 is a configuration diagram of a press forming apparatus 2 according to another embodiment.
- the press molding apparatus 1 only one heating mechanism 30 and slow cooling mechanism 50 are provided, but a plurality of heating mechanisms 30 and slow cooling mechanisms 50 may be provided (in FIG. One by one).
- the most time is required for temperature rise and cooling of the glass material. Therefore, by providing a plurality of heating mechanisms 30 and slow cooling mechanisms 50 as in the press molding apparatus 2, the number of press moldings per unit time. Can be increased.
- the inventors press-molded a cover glass of a portable device such as a smartphone or a tablet PC from a glass material using the press-molding apparatus 1 described with reference to FIG.
- the press molding apparatus 1 used in this embodiment does not include the placement mechanism 20 and the take-out mechanism 60, and the user (the inventors) can place the glass material and take out the cover glass after molding. went.
- each condition of the press molding in the embodiment will be described.
- Glass material G The thermophysical value of the glass material G press-molded in the examples is shown below.
- the size of the press-molded glass material G is 50 mm long, 105 mm wide, and 2 mm thick.
- Working point (Log 10 ⁇ 2) 1000 ° C.
- Softening point (Log 10 ⁇ 7.6) 710 ° C.
- Transport plate 11 A transport plate 11 was obtained by forming a coating 11b mainly composed of silicon carbide (SiC) on the surface of a substrate 11a mainly composed of graphite (C).
- the main component mentioned here means that impurities may be contained to such an extent that the physical properties (particularly the linear expansion coefficient) of the main component do not change.
- Heating mechanism 30 The upper heating means 31a and the lower heating means 31b were each adjusted to a temperature of 980 ° C., and the glass material G placed on the transport plate 11 was heated. At this time, the viscosity ⁇ of the glass material was about 1 ⁇ 10 6 (Pa ⁇ s).
- the upper mold 41 was temperature-controlled at 530 ° C., and the soaking plate 43 was adjusted to 400 ° C., and the heated glass material G placed on the conveying plate 11 was press-molded.
- the glass material was press-molded with a force of 25 kN.
- the cover glass after press molding was free from fogging and cracking, and a glass having a desired shape could be obtained. As described above, it has been found from the Examples that press molding can be performed without any problem with respect to glass having low viscosity.
- the glass molding method of the present invention can be efficiently molded in a state where the glass surface is smooth, so that glass that is required to have design properties, for example, a glass used for a cover terminal of a monitor such as a mobile terminal such as a smartphone or an LCD. Suitable for molding.
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Abstract
Description
図1は、実施形態に係るプレス成形装置1の構成図である。プレス成形装置1は、搬送機構10と、載置機構20と、加熱機構30と、プレス機構40と、徐冷機構50と、取出機構60とを備える。
載置機構20は、プレス成形の対象であるガラス素材Gを搬送板11上に載置する。搬送機構10の駆動手段14は、搬送板11を加熱機構30の位置まで搬送する。
図5は、その他の実施形態に係るプレス成形装置2の構成図である。実施形態に係るプレス成形装置1では、加熱機構30と徐冷機構50をそれぞれ1つだけ備えていたが、加熱機構30と徐冷機構50を複数備えるようにしてもよい(図5では、2つずつ)。ガラス素材のプレス成形では、ガラス素材の昇温と冷却に最も時間を取られるため、プレス成形装置2のように加熱機構30と徐冷機構50を複数備えることで、単位時間当たりのプレス成形回数を増加することができる。
実施例においてプレス成形したガラス素材Gの熱物性の値を以下に示す。なお、プレス成形したガラス素材Gの大きさは、縦50mm、横105mm、厚さ2mmである。
作業点(Log10η=2) 1000℃。
軟化点(Log10η=7.6) 710℃。
ガラス転移点 520℃。
グラファイト(C)を主成分とする基材11aの表面に、炭化ケイ素(SiC)を主成分とする被膜11bを形成したものを搬送板11とした。なお、ここで言う主成分とは、該主成分の物性(特に、線膨張係数)が変化しない程度に不純物が含まれていても良いとの意味である。
上側加熱手段31a及び下側加熱手段31bを、980℃にそれぞれ温調して、搬送板11上に載置されたガラス素材Gを加熱した。この際の、ガラス素材の粘度ηは、約1×106(Pa・s)であった。
上金型41を530℃、均熱板43を400℃にそれぞれ温調して、搬送板11上に載置された加熱後のガラス素材Gをプレス成形した。ガラス素材は、25kNの力でプレス成形した。
なお、本出願は、2011年9月28日に、日本国特許庁に出願された特願2011-212486号に基づき優先権を主張し、その内容をここに援用する。
Claims (16)
- ガラス素材をプレス成形するプレス成形装置であって、
前記ガラス素材を載置する載置板と、
前記載置板上の前記ガラス素材をプレス成形可能な温度まで加熱する加熱機構と、
前記加熱機構により加熱された前記ガラス素材を、前記載置板との間でプレス成形する金型と、
を備えることを特徴とするプレス成形装置。 - 前記載置板の線膨張係数が、12×10-6/K以下であることを特徴とする請求項1に記載のプレス成形装置。
- 前記載置板は、表面に被膜が形成されていることを特徴とする請求項1又は請求項2に記載のプレス成形装置。
- 前記被膜の線膨張係数は、前記載置板の線膨張係数よりも大きいことを特徴とする請求項3に記載のプレス成形装置。
- 前記載置板の主成分が炭素であり、前記被膜の主成分が炭化ケイ素であることを特徴とする請求項3乃至請求項4のいずれか1項に記載のプレス成形装置。
- 前記加熱機構は、複数の加熱手段を備え、前記載置板を複数のエリアごとに独立して加熱することを特徴とする請求項1乃至請求項5のいずれか1項に記載のプレス成形装置。
- 前記ガラス素材を前記載置板との間でプレス成形する際に、前記載置板を前記金型まで押し上げる昇降手段をさらに備えることを特徴とする請求項1乃至請求項6のいずれか1項に記載のプレス成形装置。
- 前記昇降手段の上部に設けられ、前記載置板の下面と当接して、前記載置板を冷却する均熱板をさらに備えることを特徴とする請求項7に記載のプレス成形装置。
- ガラス素材をプレス成形するプレス成形方法であって、
載置板上に前記ガラス素材を載置する第1の工程と、
前記載置板上の前記ガラス素材をプレス成形可能な温度まで加熱する第2の工程と、
前記加熱された前記ガラス素材を、前記載置板との間でプレス成形する第3の工程と、
を有することを特徴とするプレス成形方法。 - 前記第2の工程は、
前記載置板を複数のエリアごとに独立して加熱することを特徴とする請求項9に記載のプレス成形方法。 - 前記第3の工程は、
前記載置板の下面を支持しながら行うことを特徴とする請求項9又は請求項10に記載のプレス成形方法。 - 前記第3の工程は、
前記載置板を冷却しながら行うことを特徴とする請求項9乃至請求項11のいずれか1項に記載のプレス成形方法。 - ガラス素材をプレス成形する際に使用するプレス成形用の載置板であって、
前記載置板の線膨張係数が、12×10-6/K以下であることを特徴とするプレス成形用の載置板。 - 前記載置板は、表面に被膜が形成されていることを特徴とする請求項13に記載のプレス成形用の載置板。
- 前記被膜の線膨張係数は、前記載置板の線膨張係数よりも大きいことを特徴とする請求項14に記載のプレス成形用の載置板。
- 前記載置板の主成分が炭素であり、前記被膜の主成分が炭化ケイ素であることを特徴とする請求項13乃至請求項15のいずれか1項に記載のプレス成形用の載置板。
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KR1020147006197A KR20140078617A (ko) | 2011-09-28 | 2012-09-20 | 프레스 성형 장치, 프레스 성형 방법, 프레스 성형용의 재치판 |
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2012
- 2012-09-20 CN CN201280046874.XA patent/CN103827050A/zh active Pending
- 2012-09-20 WO PCT/JP2012/074007 patent/WO2013047306A1/ja active Application Filing
- 2012-09-20 KR KR1020147006197A patent/KR20140078617A/ko not_active Application Discontinuation
- 2012-09-20 JP JP2013536205A patent/JPWO2013047306A1/ja not_active Withdrawn
- 2012-09-27 TW TW101135677A patent/TW201321316A/zh unknown
-
2014
- 2014-03-24 US US14/222,773 patent/US20140202212A1/en not_active Abandoned
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JPH02114429A (ja) * | 1988-10-24 | 1990-04-26 | Fujitsu General Ltd | カラー表示用pdpの螢光体層用凹部形成方法 |
JP2010116295A (ja) * | 2008-11-13 | 2010-05-27 | Canon Inc | 光学素子成形用型及びその製造方法 |
JP2011184248A (ja) * | 2010-03-09 | 2011-09-22 | Asahi Glass Co Ltd | 光学素子の成形装置 |
JP2012116722A (ja) * | 2010-12-02 | 2012-06-21 | Nippon Electric Glass Co Ltd | ガラス板の曲げ成形方法およびその成形装置 |
Also Published As
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TW201321316A (zh) | 2013-06-01 |
CN103827050A (zh) | 2014-05-28 |
KR20140078617A (ko) | 2014-06-25 |
JPWO2013047306A1 (ja) | 2015-03-26 |
US20140202212A1 (en) | 2014-07-24 |
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