JPS6292238A - Working method for magnetic disc - Google Patents

Working method for magnetic disc

Info

Publication number
JPS6292238A
JPS6292238A JP23252185A JP23252185A JPS6292238A JP S6292238 A JPS6292238 A JP S6292238A JP 23252185 A JP23252185 A JP 23252185A JP 23252185 A JP23252185 A JP 23252185A JP S6292238 A JPS6292238 A JP S6292238A
Authority
JP
Japan
Prior art keywords
shaped
plastic substrate
groove
chamfering
base
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.)
Pending
Application number
JP23252185A
Other languages
Japanese (ja)
Inventor
Kengo Oishi
健吾 大石
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP23252185A priority Critical patent/JPS6292238A/en
Publication of JPS6292238A publication Critical patent/JPS6292238A/en
Pending legal-status Critical Current

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  • Turning (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To improve the productivity by forming a concentric taper groove to both front and rear sides of a base in the same diameter, cutting off the middle part to form a doughnut shaped base thereby eliminating the need for chamfering and simplifying the working process. CONSTITUTION:A taper groove 3 whose cross section is V-shaped and whose diameter is equal to that of a center opening 10 to be formed finally is formed around a runner 2 at the middle to the plastic disc 1 by the plastic injection molding. Then the middle part is cut off from the groove 3 and the doughnut shaped plastic base 1' where taper faces 3A, 3B as chamfer are formed at both the front and rear sides is formed. Thus, no chamfering process is required, the working process requires only one machining process so as to simplify the process and to improve the productivity.

Description

【発明の詳細な説明】 （発明の分野） 水元１ｕＪはドーナツ型のプラスデック基板の−Ｆに磁
気記録媒体を施してなるリジッドタイプディスクの加工
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) Mizumoto 1uJ relates to a method for processing a rigid type disk in which a magnetic recording medium is applied to a donut-shaped plus deck substrate -F.

（従来技術） 中央に開口を有する比較的硬質の円形のプラスチック基
板の上に磁気記録媒体を施してイ（るリジッドタイプの
磁気ディスクが人容吊の磁気ディスクとして使用されて
いるが、この中央の開口には面取りがなされている。こ
の而取りは、円盤状のプラスチック５．１板の中央部を
機械的に切り取った後、片面ずつ、基板を反転させなが
ら機械的に切削加工して行なっており、加工工程上手間
がかかるものとなっている。(Prior art) A rigid type magnetic disk, in which a magnetic recording medium is placed on a relatively hard circular plastic substrate with an opening in the center, is used as a magnetic disk for human suspension. The opening is chamfered. This chamfering is done by mechanically cutting out the center of a disc-shaped plastic 5.1 plate, and then mechanically cutting one side at a time while turning the board over. This makes the processing process time-consuming.

（発明の目的） 本発明は、この面取り工程を簡略化して、この種のディ
スクの生産性を向上させる加工方法を提供することを［
ｉ的とするものである。(Objective of the Invention) The present invention aims to provide a processing method that simplifies this chamfering process and improves the productivity of this type of disk.
It is intended to be i-specific.

（ｆｅ明の構成） 本発明の加工方法は、円盤状のプラスチック基板の中央
に円心状に断面Ｖ字型の円径のテーパ溝を表裏両面に形
成し、このテーパ溝から中央の部分を機械切削加工によ
り切除してドーナツ状のプラスチック基板を作るように
したことを特徴とするものである。(Structure of Fe Akira) The processing method of the present invention involves forming a tapered groove with a circular diameter of a V-shaped cross section in a concentric manner in the center of a disc-shaped plastic substrate on both the front and back surfaces, and from this tapered groove, the central part is removed. It is characterized in that it is cut out by mechanical cutting to create a donut-shaped plastic substrate.

表裏両面からＶ字型のテーパ溝が形成されており、ここ
から中央部を切除するので、ディスクの中央に形成され
る間口の縁部には表裏とも面取りが自動的に形成され、
その後の面取り工程が不要となる。A V-shaped tapered groove is formed on both the front and back sides, and since the central part is cut out from there, chamfers are automatically formed on the edges of the frontage formed in the center of the disc on both the front and back.
The subsequent chamfering process becomes unnecessary.

（実　施　例） 以下、図面により本発明の詳細な説明する。(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

第１図は本発明により作成された円盤状のプラスチック
基板１を示すもので、プラスチックの射出成形により、
中央のランナー２の周囲に最終的に形成されるべき中央
間口１０〈第３図参照〉の径に等しい所定の半径の断面
Ｖ字型のテーパ溝３が形成される。この断面を第２図に
拡大して示す。FIG. 1 shows a disc-shaped plastic substrate 1 made according to the present invention, which is made by injection molding of plastic.
A tapered groove 3 having a V-shaped cross section and a predetermined radius equal to the diameter of the central opening 10 (see FIG. 3) to be finally formed is formed around the central runner 2. This cross section is shown enlarged in FIG.

次に、このテーパ溝３から中央部を機械切削加工により
切除する。これにより、第３図に示ずような表裏両側に
テーパ面３△、３Ｂが面取りとして形成されたドーナツ
状のプラスチック基板１′が形成される。Next, the central portion of the tapered groove 3 is cut out by mechanical cutting. As a result, a donut-shaped plastic substrate 1' having tapered surfaces 3Δ and 3B formed as chamfers on both the front and back sides as shown in FIG. 3 is formed.

（発明の効果） これは、上記テーパ溝３のためにテーパ溝３Ａ。(Effect of the invention) This is the taper groove 3A for the taper groove 3 mentioned above.

３Ｂが上記機械加工とともに形成されるので、改めて面
取りをする必要がなく、加工工程は１回の切削加工のみ
でよく、きわめて簡略化され生産性が向上する。3B is formed together with the above-mentioned machining process, there is no need to perform chamfering again, and the machining process only requires one cutting process, which greatly simplifies the process and improves productivity.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明による磁気ディスクの加工に使用される
円盤状プラスチック基板の例を示す斜視図、 第２図はその一部切欠断面図、 第３図は中央部分を機械加工により切除した後のドーナ
ツ状プラスチック基板の断面図である。Fig. 1 is a perspective view showing an example of a disk-shaped plastic substrate used for processing a magnetic disk according to the present invention, Fig. 2 is a partially cutaway sectional view of the same, and Fig. 3 is a view after cutting out the central portion by machining. FIG. 2 is a cross-sectional view of a donut-shaped plastic substrate.

Claims (1)

【特許請求の範囲】[Claims] １）円盤状のプラスチック基板の表面に磁気記録媒体を
設けてなるリジッドタイプのドーナツ型磁気ディスクの
製造において、円盤状のプラスチック基板に該基板の表
裏両面に、同径の円心状の断面Ｖ字形のテーパ溝を形成
し、該基板のこのテーパ溝から中央の部分を機械切削加
工により切除してドーナツ状のプラスチック基板を作る
ことを特徴とする磁気ディスクの加工方法。1) In manufacturing a rigid donut-shaped magnetic disk in which a magnetic recording medium is provided on the surface of a disk-shaped plastic substrate, a circular center-shaped cross section V of the same diameter is placed on both the front and back surfaces of the disk-shaped plastic substrate. 1. A method of processing a magnetic disk, which comprises forming a tapered groove in the shape of a letter, and cutting out a central portion of the substrate from the tapered groove by mechanical cutting to produce a donut-shaped plastic substrate.
JP23252185A 1985-10-18 1985-10-18 Working method for magnetic disc Pending JPS6292238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23252185A JPS6292238A (en) 1985-10-18 1985-10-18 Working method for magnetic disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23252185A JPS6292238A (en) 1985-10-18 1985-10-18 Working method for magnetic disc

Publications (1)

Publication Number Publication Date
JPS6292238A true JPS6292238A (en) 1987-04-27

Family

ID=16940630

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23252185A Pending JPS6292238A (en) 1985-10-18 1985-10-18 Working method for magnetic disc

Country Status (1)

Country Link
JP (1) JPS6292238A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005337421A (en) * 2004-05-28 2005-12-08 Ntn Corp Angular ball bearing and its manufacturing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005337421A (en) * 2004-05-28 2005-12-08 Ntn Corp Angular ball bearing and its manufacturing method

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