JP2003054961A - Press forming method, press forming apparatus and substrate for magnetic disk formed by press formation - Google Patents
Press forming method, press forming apparatus and substrate for magnetic disk formed by press formationInfo
- Publication number
- JP2003054961A JP2003054961A JP2001244800A JP2001244800A JP2003054961A JP 2003054961 A JP2003054961 A JP 2003054961A JP 2001244800 A JP2001244800 A JP 2001244800A JP 2001244800 A JP2001244800 A JP 2001244800A JP 2003054961 A JP2003054961 A JP 2003054961A
- Authority
- JP
- Japan
- Prior art keywords
- press
- molding
- die
- magnetic disk
- press forming
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- 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
-
- 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
-
- 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
- C03B11/088—Flat discs
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プレス成形方法お
よびプレス成形装置、ならびに、プレス成形により形成
した磁気ディスク用基板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding method, a press molding apparatus, and a magnetic disk substrate formed by press molding.
【０００２】[0002]
【従来の技術】近年に至り、磁気ディスク装置は、急激
な高記録密度化、及び、低コスト化が進んでいる。この
磁気ディスク装置は、高速回転する記憶媒体（ディス
ク）上にヘッドを僅かに浮上させて走査させることによ
ってランダムアクセスを実現しているが、高記憶密度と
高速アクセスを両立させる為には、磁気ディスク回転数
を上げること、磁気ディスクとヘッドの間隔（ヘッド浮
上量）を小さくすること、が求められる。また磁気ディ
スクの基板材料としては、従来、ＡｌにＮｉ−Ｐメッキ
を施した基板が主流であったが、高剛性で高速回転させ
ても変形しづらく且つ表面の平滑性が高い、ガラス基板
が使われるようになってきた。2. Description of the Related Art In recent years, magnetic disk devices have been rapidly increasing in recording density and cost. This magnetic disk device realizes random access by slightly moving the head over a storage medium (disk) that rotates at high speed to perform scanning, but in order to achieve both high storage density and high speed access, It is required to increase the number of disk rotations and to reduce the distance between the magnetic disk and the head (head flying height). As a substrate material for the magnetic disk, a substrate obtained by plating Al with Ni-P has been mainly used in the past, but a glass substrate, which has high rigidity, is hard to be deformed even when rotated at high speed, and has high surface smoothness, is a glass substrate. It has come to be used.
【０００３】更に現在では、低コスト化を図るため、プ
レス法による成形によりガラス基板を作成する試みがな
されている。Further, at present, in order to reduce the cost, attempts have been made to form a glass substrate by molding by a pressing method.
【０００４】[0004]
【発明が解決しようとする課題】しかし、プレス法によ
る成形によりガラス基板を作成するに際しては、成形用
金型の表面に、腐食・劣化の問題が生じる。すなわち、
ガラス材料をプレスする際に用いる成形用金型の表面に
は、極めて耐食性の高い貴金属系金属膜、又はその合金
膜を施しているが、ガラス材料に含まれる水分およびア
ルカリ金属が高温・高圧下のプレス成形時に変形するガ
ラス材料から発生することに起因して、貴金属系金属
膜、又はその合金膜が腐食・劣化し、その寿命が短くな
るという問題がある。However, when forming a glass substrate by molding by the pressing method, the surface of the molding die is subject to corrosion and deterioration. That is,
The surface of the molding die used to press the glass material is coated with a highly corrosion-resistant noble metal-based metal film or its alloy film. There is a problem that the noble metal-based metal film or its alloy film is corroded / deteriorated due to the generation from the glass material that is deformed during the press molding, and its life is shortened.
【０００５】よって本発明の目的は、上述の点に鑑み、
成形用金型の表面に腐食・劣化の問題が生じないように
した、プレス成形方法およびプレス成形装置、ならび
に、プレス成形により形成した磁気ディスク用基板を提
供することにある。Therefore, in view of the above points, an object of the present invention is to
It is an object of the present invention to provide a press-molding method and a press-molding apparatus, and a magnetic disk substrate formed by press-molding, in which the problem of corrosion and deterioration does not occur on the surface of a molding die.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明では、昇温・プレス・冷却と言う、プレス
成形プロセス中において、その双方の成形用金型に交流
電圧を印可することにより、電気的に防食を行う。これ
により、プレス成形によるガラス変形時にガラス材料か
ら発生する水分・アルカリ金属による成形用金型表面の
腐食を抑制し、その長寿命化を達成することができる。In order to achieve the above object, in the present invention, an alternating voltage is applied to both molding dies during a press molding process called temperature rising, pressing and cooling. By doing so, corrosion protection is performed electrically. As a result, it is possible to suppress the corrosion of the surface of the molding die due to moisture and alkali metal generated from the glass material when the glass is deformed by press molding, and to achieve a long life.
【０００７】より具体的に述べると、上記の目的を達成
するために、請求項１に係る本発明は、プレス成形用金
型にてプレス成形する際、該プレス成形用金型に含まれ
る双方の金型間に交流電圧を印可してプレス成形を行う
プレス成形方法である。More specifically, in order to achieve the above object, the present invention according to claim 1 is such that when press-molding with a press-molding die, both are included in the press-molding die. Is a press molding method in which an AC voltage is applied between the molds to perform press molding.
【０００８】請求項２に係る本発明は、請求項１に係る
プレス成形方法おいて、前記プレス成形用金型として、
超硬材料を型部材とするプレス成形用金型を用い、該金
型の成形面に電気電導性を有する膜を付着したものであ
る。According to a second aspect of the present invention, in the press molding method according to the first aspect, as the press molding die,
A press-molding die having a superhard material as a die member is used, and a film having electrical conductivity is attached to the molding surface of the die.
【０００９】請求項３に係る本発明は、プレス成形用金
型を用いてプレス成形を行うプレス成形装置であって、
プレス成形時に、前記プレス成形用金型に含まれる双方
の金型間に交流電圧を印可する交流電源を具備したもの
である。The present invention according to claim 3 is a press molding apparatus for performing press molding using a press molding die,
At the time of press molding, an AC power source for applying an AC voltage is provided between both molds included in the press molding mold.
【００１０】請求項４に係る本発明は、請求項３に係る
プレス成形装置おいて、前記プレス成形用金型として、
超硬材料を型部材とするプレス成形用金型を用い、該金
型の成形面に電気電導性を有する膜を付着したものであ
る。The present invention according to claim 4 provides the press molding apparatus according to claim 3, wherein:
A press-molding die having a superhard material as a die member is used, and a film having electrical conductivity is attached to the molding surface of the die.
【００１１】請求項５に係る本発明は、プレス成形用金
型にてプレス成形した磁気ディスク用基板であって、該
プレス成形用金型に含まれる双方の金型間に交流電圧を
印可してプレス成形を行うものである。The present invention according to claim 5 is a magnetic disk substrate press-molded by a press-molding die, wherein an alternating voltage is applied between both molds included in the press-forming die. Press molding is performed.
【００１２】請求項６に係る本発明は、請求項５に係る
磁気ディスク用基板において、前記プレス成形用金型と
して、超硬材料を型部材とするプレス成形用金型を用
い、該金型の成形面に電気電導性を有する膜を付着した
ものである。According to a sixth aspect of the present invention, in the magnetic disk substrate according to the fifth aspect, a press-molding die having a superhard material as a die member is used as the press-molding die. A film having electric conductivity is attached to the molding surface of the above.
【００１３】請求項７に係る本発明は、請求項５または
６に係る磁気ディスク用基板において、ガラス材料をプ
レス成形することにより磁気ディスク用ガラス基板を形
成するものである。The present invention according to claim 7 is the magnetic disk substrate according to claim 5 or 6, wherein the glass substrate for magnetic disk is formed by press molding a glass material.
【００１４】[0014]
【発明の実施の形態】以下、図面を参照しながら、本発
明の実施の形態を詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.
【００１５】図１は、本実施の形態に係るプレス成形用
金型を使用したプレス成形機の基本的な構成を示す説明
図である。本図において、３はガラス材料、４は上型、
５は下型、６は上型用ヒータ部、７は下型用ヒータ部、
８は上型用リード線、９は下型用リード線、１０はピス
トンシリンダ、１１はチャンバ、１２は窒素ガス導入
口、２０はＡＣ電源、である。FIG. 1 is an explanatory view showing the basic structure of a press molding machine using a press molding die according to this embodiment. In this figure, 3 is a glass material, 4 is an upper mold,
5 is a lower die, 6 is an upper die heater section, 7 is a lower die heater section,
Reference numeral 8 is an upper die lead wire, 9 is a lower die lead wire, 10 is a piston cylinder, 11 is a chamber, 12 is a nitrogen gas inlet, and 20 is an AC power source.
【００１６】図２は、本実施の形態に係る磁気ディスク
用ガラス基板のプレス成形金型を示す拡大断面図であ
る。本図において、１はプレス用金型母材、２は保護膜
（Ｐｔ）である。FIG. 2 is an enlarged sectional view showing a press-molding die for a glass substrate for a magnetic disk according to this embodiment. In this figure, 1 is a press die base material, and 2 is a protective film (Pt).
【００１７】[0017]
【実施例】以下に述べる各実施例では、プレス用金型と
して超硬合金により作成されたプレス用金型母材１の成
形面上をダイヤモンド砥粒によりＲａ＝０．５ｎｍに研
磨し、その表面にスパッタ法によりＰｔ薄膜を１μｍの
厚さに成膜した物をプレス用金型とした。EXAMPLES In each of the examples described below, the forming surface of a press die base material 1 made of a cemented carbide as a press die was polished to Ra = 0.5 nm with diamond abrasive grains, The press mold was a Pt thin film having a thickness of 1 μm formed on the surface by a sputtering method.
【００１８】プレス成形用のガラス材料３として、アル
ミノシリケートガラスからなる直径約８ｍｍの球状のプ
レス前ガラス材料を、クエン酸アンモニウム５％溶液に
浸漬（５分間）にて洗浄後、オーバーフロー式の超音波
洗浄層にて１８ＭΩ以上の超純水に浸漬・洗浄（５分間
を２回）を行い、ＩＰＡ蒸気乾燥にて清浄なガラス材料
を得た。As the glass material 3 for press molding, a spherical pre-press glass material made of aluminosilicate glass having a diameter of about 8 mm was immersed in a 5% solution of ammonium citrate for 5 minutes to wash it, and then the overflow type super-material was used. The ultrasonic cleaning layer was immersed in ultrapure water of 18 MΩ or more and washed (twice for 5 minutes), and a clean glass material was obtained by IPA vapor drying.
【００１９】そのガラス材料３を、成形面同士を上下に
対向させたプレス用金型４，５の間に置き、それぞれの
プレス用金型にリード線８，９を接続し、表１に示す条
件にて電圧を印可した状態でプレス成形を行った。The glass material 3 is placed between pressing dies 4, 5 whose molding surfaces are opposed to each other vertically, and lead wires 8, 9 are connected to the respective pressing dies, and shown in Table 1. Press molding was performed with voltage applied under the conditions.
【００２０】成形条件として、金型表面温度は７００
℃、成形圧力を４００ｋｇ／ｃｍ２とし、成形時間は１
分間とした。その後加熱を停止し、プレス圧力を１００
ｋｇ／ｃｍ２として冷却を行い、ヒータの温度モニタが
４００℃で離型し成形を終了した。As molding conditions, the mold surface temperature is 700
℃, molding pressure is 400kg / cm 2 , molding time is 1
Minutes. After that, stop heating and press pressure to 100
Cooling was performed at kg / cm 2 , and the temperature monitor of the heater was released at 400 ° C. to complete the molding.
【００２１】[0021]
【表１】 [Table 1]
【００２２】そこで、この様なプレス成形を１０００回
行った後に、プレス成形した磁気ディスク用ガラス基板
の表面、及び、金型表面をＡＦＭ（原子間力顕微鏡）に
より５０μｍ角の範囲で５ヶ所測定した上、その表面の
粗さの平均を算出して評価した結果を表２に示す。Then, after performing such press molding 1000 times, the surface of the press-molded glass substrate for a magnetic disk and the mold surface were measured by an AFM (atomic force microscope) at 5 points within a range of 50 μm square. In addition, Table 2 shows the results of evaluation by calculating the average surface roughness.
【００２３】[0023]
【表２】 [Table 2]
【００２４】表２から明らかなように、実施例１〜３は
比較例１に比べて金型表面品質の劣化が少なく、成形ガ
ラス表面粗さも良好である。すなわち、防食効果が認め
られる。比較例２においては、数回のプレス成形におい
て、マイナス電極側では殆ど劣化は見られないが、プラ
ス電極側では変色、及び、ガラスの付着が見られた。つ
まり、実施例１〜３によれば、成形用金型の長寿命化を
達成すると共に、信頼性の高い磁気ディスクガラス基板
を製造することができる。As is clear from Table 2, Examples 1 to 3 have less deterioration of the mold surface quality than Comparative Example 1 and have good molded glass surface roughness. That is, the anticorrosion effect is recognized. In Comparative Example 2, after several press moldings, almost no deterioration was observed on the negative electrode side, but discoloration and glass adhesion were observed on the positive electrode side. That is, according to Examples 1 to 3, it is possible to achieve a long life of the molding die and manufacture a highly reliable magnetic disk glass substrate.
【００２５】[0025]
【発明の効果】以上説明した通り本発明によれば、成形
用金型の表面に腐食・劣化の問題が生じないようにし
た、プレス成形方法およびプレス成形装置、ならびに、
プレス成形により形成した磁気ディスク用基板を実現す
ることができる。その結果、成形用金型の寿命を延ばす
ことにより、信頼性の高い磁気ディスク用基板を安価に
且つ大量に製造することができる。As described above, according to the present invention, the press molding method and the press molding apparatus which prevent the problem of corrosion and deterioration on the surface of the molding die, and
A magnetic disk substrate formed by press molding can be realized. As a result, by extending the life of the molding die, a highly reliable magnetic disk substrate can be manufactured inexpensively and in large quantities.
【図１】本実施の形態に係るプレス成形用金型を使用し
たプレス成形機の基本的な構成図である。FIG. 1 is a basic configuration diagram of a press molding machine using a press molding die according to the present embodiment.
【図２】本実施の形態に係る磁気ディスク用ガラス基板
のプレス成形金型を示す拡大断面図である。FIG. 2 is an enlarged cross-sectional view showing a press-molding die for a glass substrate for a magnetic disk according to the present embodiment.
１ プレス用金型母材 ２ 保護膜（Ｐｔ） ３ ガラス材料 ４ 上型 ５ 下型 ６ 上型用ヒータ部 ７ 下型用ヒータ部 ８ 上型用リード線 ９ 下型用リード線 １０ ピストンシリンダ １１ チャンバ １２ 窒素ガス導入口 ２０ ＡＣ電源 1 Mold base material for press 2 Protective film (Pt) 3 glass materials 4 Upper mold 5 Lower mold 6 Upper mold heater part 7 Lower die heater 8 Lead wire for upper mold 9 Lead wire for lower mold 10 piston cylinder 11 chambers 12 Nitrogen gas inlet 20 AC power supply
───────────────────────────────────────────────────── フロントページの続き (72)発明者 片岡 秀直 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 伊藤 健太 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 4K060 AA03 BA16 BA33 DA03 EA20 EB10 FA03 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hidenao Kataoka 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. (72) Inventor Kenta Ito 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. F-term (reference) 4K060 AA03 BA16 BA33 DA03 EA20 EB10 FA03
Claims (7)
際、該プレス成形用金型に含まれる双方の金型間に交流
電圧を印可してプレス成形を行うことを特徴とするプレ
ス成形方法。1. A press-molding method, wherein when press-molding with a press-molding die, an AC voltage is applied between both molds included in the press-molding die. .
て、 前記プレス成形用金型として、超硬材料を型部材とする
プレス成形用金型を用い、該金型の成形面に電気電導性
を有する膜を付着したことを特徴とするプレス成形方
法。2. The press-molding method according to claim 1, wherein the press-molding die is a press-molding die having a cemented carbide material as a die member, and an electrically conductive surface is formed on the molding surface of the die. A press molding method, characterized in that a film having properties is attached.
行うプレス成形装置であって、 プレス成形時に、前記プレス成形用金型に含まれる双方
の金型間に交流電圧を印可する交流電源を具備したこと
を特徴とするプレス成形装置。3. A press molding apparatus for performing press molding using a press molding die, wherein an AC power source for applying an AC voltage between both molds included in the press molding die during press molding. A press forming apparatus comprising:
て、 前記プレス成形用金型として、超硬材料を型部材とする
プレス成形用金型を用い、該金型の成形面に電気電導性
を有する膜を付着したことを特徴とするプレス成形装
置。4. The press-molding apparatus according to claim 3, wherein a press-molding die having a cemented material as a die member is used as the press-molding die, and an electric conductivity is applied to a molding surface of the die. A press forming apparatus having a film having properties attached thereto.
気ディスク用基板であって、該プレス成形用金型に含ま
れる双方の金型間に交流電圧を印可してプレス成形を行
うことを特徴とする磁気ディスク用基板。5. A magnetic disk substrate press-molded by a press-molding die, wherein press-molding is performed by applying an AC voltage between both molds included in the press-molding die. Characteristic magnetic disk substrate.
おいて、 前記プレス成形用金型として、超硬材料を型部材とする
プレス成形用金型を用い、該金型の成形面に電気電導性
を有する膜を付着したことを特徴とする磁気ディスク用
基板。6. The magnetic disk substrate according to claim 5, wherein the press-molding die is a press-molding die having a superhard material as a die member, and an electrically conductive surface is formed on the molding surface of the die. A substrate for a magnetic disk having a film having a property attached thereto.
用基板において、 ガラス材料をプレス成形することにより磁気ディスク用
ガラス基板を形成することを特徴とする磁気ディスク用
基板。7. The magnetic disk substrate according to claim 5 or 6, wherein the glass substrate for magnetic disk is formed by press molding a glass material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001244800A JP2003054961A (en) | 2001-08-10 | 2001-08-10 | Press forming method, press forming apparatus and substrate for magnetic disk formed by press formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001244800A JP2003054961A (en) | 2001-08-10 | 2001-08-10 | Press forming method, press forming apparatus and substrate for magnetic disk formed by press formation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003054961A true JP2003054961A (en) | 2003-02-26 |
Family
ID=19074677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001244800A Withdrawn JP2003054961A (en) | 2001-08-10 | 2001-08-10 | Press forming method, press forming apparatus and substrate for magnetic disk formed by press formation |
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| Country | Link |
|---|---|
| JP (1) | JP2003054961A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008123293A1 (en) * | 2007-03-29 | 2008-10-16 | National Institute Of Advanced Industrial Science And Technology | Method for molding glass member, molding apparatus, and molded product of glass material |
| JP2008266123A (en) * | 2007-03-29 | 2008-11-06 | National Institute Of Advanced Industrial & Technology | Method for molding glass member, molding apparatus, and molded product of glass material |
-
2001
- 2001-08-10 JP JP2001244800A patent/JP2003054961A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008123293A1 (en) * | 2007-03-29 | 2008-10-16 | National Institute Of Advanced Industrial Science And Technology | Method for molding glass member, molding apparatus, and molded product of glass material |
| JP2008266123A (en) * | 2007-03-29 | 2008-11-06 | National Institute Of Advanced Industrial & Technology | Method for molding glass member, molding apparatus, and molded product of glass material |
| US8099982B2 (en) | 2007-03-29 | 2012-01-24 | National Institute Of Advanced Industrial Science And Technology | Method of molding glass parts and molding apparatus |
| KR101199829B1 (en) | 2007-03-29 | 2012-11-09 | 도꾸리쯔교세이호진 상교기쥬쯔 소고겡뀨죠 | Method for molding glass member, molding apparatus, and molded product of glass material |
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