EP0057859B1 - Vorrichtung zum Bearbeiten der Oberfläche magnetischer Aufzeichnungsträger - Google Patents

Vorrichtung zum Bearbeiten der Oberfläche magnetischer Aufzeichnungsträger Download PDF

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Publication number
EP0057859B1
EP0057859B1 EP82100574A EP82100574A EP0057859B1 EP 0057859 B1 EP0057859 B1 EP 0057859B1 EP 82100574 A EP82100574 A EP 82100574A EP 82100574 A EP82100574 A EP 82100574A EP 0057859 B1 EP0057859 B1 EP 0057859B1
Authority
EP
European Patent Office
Prior art keywords
pressure
recording medium
abrasive belt
magnetic recording
roll
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.)
Expired
Application number
EP82100574A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0057859A2 (de
EP0057859A3 (en
Inventor
Manfred Gehrung
Klaus Schoettle
Helmut Kreissler
Peter Rudolf
Joachim Hack
Friedrich Anslinger
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0057859A2 publication Critical patent/EP0057859A2/de
Publication of EP0057859A3 publication Critical patent/EP0057859A3/de
Application granted granted Critical
Publication of EP0057859B1 publication Critical patent/EP0057859B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/12—Single-purpose machines or devices for grinding travelling elongated stock, e.g. strip-shaped work
    • B24B7/13—Single-purpose machines or devices for grinding travelling elongated stock, e.g. strip-shaped work grinding while stock moves from coil to coil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings

Definitions

  • the invention relates to a device for processing the surface of magnetic recording media by grinding, with a moving means for the magnetic recording medium, an abrasive belt guided along the layer surface as an abrasive, and at least one pressure element which is movably held above the layer surface and connected to an actuator.
  • Magnetic recording media are made by coating rigid or flexible documents, e.g. Aluminum disks or foils, produced with a lacquer pigmented with magnetic particles, in particular iron oxide.
  • the unevenness that still exists after the coating process must be carefully removed with due regard to the small layer thickness and the smallest possible, defined fine roughness must be achieved.
  • This measure is necessary in order to ensure intimate contact between the recording layer and the magnetic head or to ensure smooth and undisturbed flight behavior with heads hovering above the layer surface, e.g. for disk storage. This should damage the layer surface during read / write operation, e.g. by touching the read / write head with the plate or by tearing out layer parts through the head at elevations in the surface, especially in the case of flexible recording media, and the smallest possible fluctuations in the reading voltage can be achieved.
  • a device frequently used for the surface processing of flexible recording media causes calendering, in which e.g. Plastic films coated and uncoated are pulled between two rotating calender rollers that press against each other in a defined manner.
  • the calendering is usually carried out in the longitudinal direction of the film web. Slight irregularities in the surface of the roller therefore deteriorate the level constancy of the reading voltage and can lead to level drops.
  • Abrasives for example ceramic rollers (DE-A 26 11 032), abrasive belts or foils (DE-A 28 03 914) are usually used for processing disc surfaces or reworking flexible recording media, such as coated film webs and disks stamped therefrom.
  • flexible disks there is a drivable turntable for this, with which the disk lying thereon is set in rotation by means of a rubber-elastic base or coupling devices of the turntable shaft.
  • the ceramic roller rotates in the opposite direction and is pressed against the disc.
  • a pressure element is present, by means of which the abrasive belt is pressed against the surface to be processed.
  • the sanding belt is slowly transported from a supply roll to a take-up roll.
  • the surface treatment effect is based partly on the pressure of the abrasive on the surface and partly on its layer removal. Ceramic rollers wear out over time and lose their effectiveness. It also shows that a structure-free surface cannot be achieved with ceramic rollers or with abrasive belts or foils. Sufficient values for the micro-roughness can be achieved with them, but the macro-roughness cannot be eliminated.
  • FR-A-1 536 761 it is known from FR-A-1 536 761 to process a magnetic storage disk on both sides with the aid of block-shaped grinding elements.
  • the disc can be clamped onto a drivable turntable.
  • the grinding elements are pressed against the two surfaces of the disc to be machined by means of pneumatic working cylinders.
  • Each working cylinder is mounted on a pneumatic oscillator for cyclical movements of the grinding elements radially to the wheel.
  • the block-shaped grinding elements are subject to relatively rapid wear, so that the grinding effect from wheel to wheel also declines rapidly here. For a uniformly good surface quality of the disks, it is therefore necessary to change the block-shaped grinding elements frequently, which is a hindrance for an efficient manufacturing operation of magnetic storage disks.
  • calendering that is customary in the case of film webs provided with a magnetic layer is a further source of error apart from the effort involved.
  • calendering cannot be dispensed with, since otherwise the acceptable values for the service life and useful signal level of the recording medium are not achieved.
  • the holder for the pressure element is additionally pivotally mounted transversely to the direction of travel of the record carrier and is connected to a drive element for this mobility.
  • a turntable 2 which can be driven by a motor (not shown in the drawing) is provided (FIGS. 1 and 2).
  • This is provided with a rubber-elastic pad 3, through which the disc 1 is carried along in the rotational movement and irregularities of the disc surface on the support side, such as dust particles or other elevations, are recorded.
  • a pressure element 4 made of foam rubber or equivalent material, which extends at least over the entire support width of the disk, for pressing on an abrasive belt 5 running along the turntable 2, for example a sanding film, which is guided from a supply roll 6 to a take-up roll 7 and while of the pressure stops.
  • the pressure element has the shape of a trapezoid in its spatial extension parallel to the disk surface and is fastened to a holding plate 8, which is slidably mounted on a rail 10 by means of a dovetail-shaped connection 9 in the radial direction of the turntable and can be fixed with the aid of a screw 20.
  • a pin 12 is provided which is held in supports 11 and penetrates the rail perpendicular to its longitudinal extent.
  • the supports are fastened to an arm 13, which can be displaced via a ball-bearing bush 14 on an axis 16 carried by the device chassis 15, both perpendicular to the turntable plane and also pivotable parallel to it.
  • a pneumatic or hydraulic working cylinder 17 is attached to the device chassis 15 and is connected to the arm 13 via a rod 18.
  • a pressure of about 0.2 bar is set, which increases from about 8 seconds to about 2 bar during a machining time and is reduced to zero after another 1 second.
  • the speed of the turntable is preferably between 100 and 500 rpm.
  • the pressure element 4 perform oscillating movements in the radial direction of the turntable 2 with a frequency between 1 and 5 Hertz.
  • an electric motor 19 is provided, the shaft 21 of which is articulated via an eccentrically articulated rod 22 to a lever 23 fastened to the housing of the bush 14. Because of the mobility of the arm 13 in the two mutually perpendicular directions, the rod 18 is connected to the working cylinder 17 and the arm 13 via suitable joints 24; for the rod 22 there are similar articulated connections 25 or an axial displacement at the pivot points.
  • the supports 11 for the rail 10 of the pressure plate holder 8 in the arm 13 can be guided in the direction of the rod 18.
  • the storage of the arm 13 can then be limited to its pivotability.
  • the working cylinder 17 can also be attached so that it acts directly on the housing of the ball bearing 14 or can move the axis 16 on which the ball bearing would then be arranged immovably. Another possibility is to move the turntable 2 axially with the aid of a working cylinder.
  • a plurality of grinding stations S are arranged along this for processing a web-shaped recording medium, hereinafter referred to as web 30 for short, from an unwinding station to a rewinding station (FIG. 3).
  • the winding and unwinding station are not shown in the drawing.
  • a grinding belt 31, which is common to all stations S, is again used as the processing means and is transported from a supply roll 32 to a take-up roll 33 during the grinding process in the direction of the web 30.
  • the sanding belt moves much more slowly than the web, for example after a speed ratio of 1 to 20 to 100 (sanding belt to web), preferably 1:50.
  • individual grinding belts each with a supply and take-up roll, can also be provided for each grinding station S, which then expediently have a decreasing grinding effect in the running direction of the web from station to station, wherein the speed of the grinding belts can also be higher than that of the ones to be processed Surface.
  • a running-in process must be taken into account when inserting a new supply roll.
  • the grinding stations each consist of a drivable support roller 34 for the web 30 and a pressure roller 35 for pressing the grinding belt onto the web.
  • the support roller and pressure roller are provided with an elastic support 36, 37, for example made of foam rubber for the pressure roller and soft rubber or polyurethane for the support roller.
  • the pressure rollers are rotatably mounted in individual holding devices on which pneumatic or hydraulic working cylinders 38 act.
  • the pressures P are included Gradually increasing in the direction of travel of the web, for example when three grinding stations are arranged
  • the drive of the support rollers 23 is not shown in the drawings and the brackets and the working cylinders acting thereon for the pressure rollers 35 are only indicated.
  • drive devices can also be provided here as shown in FIGS. 1 and 2 (19-23), with which the holders of the pressure rollers are connected.
  • a further advantageous embodiment, shown in FIG. 4, consists in that the abrasive belt 31 guided along the web-shaped recording medium 30 is pressed against the surface thereof by means of a pressure bar 40 which extends over the entire width of the recording medium.
  • the record carrier is guided over a support roller 41.
  • the pressure bar is coupled to one or more working cylinders 42 distributed over the width of the recording medium.
  • the profile of the pressure surface which in turn is provided with a rubber-elastic covering 43, shows a course approaching the roller surface in the transport direction of the recording medium, so that the surface pressure increases.
  • the grinding belt again moves slowly in relation to the recording medium speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP82100574A 1981-02-05 1982-01-28 Vorrichtung zum Bearbeiten der Oberfläche magnetischer Aufzeichnungsträger Expired EP0057859B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813103874 DE3103874A1 (de) 1981-02-05 1981-02-05 Verfahren und vorrichtung zum bearbeiten der oberflaeche magnetischer aufzeichnungstraeger
DE3103874 1981-02-05

Publications (3)

Publication Number Publication Date
EP0057859A2 EP0057859A2 (de) 1982-08-18
EP0057859A3 EP0057859A3 (en) 1984-06-13
EP0057859B1 true EP0057859B1 (de) 1986-05-28

Family

ID=6124073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100574A Expired EP0057859B1 (de) 1981-02-05 1982-01-28 Vorrichtung zum Bearbeiten der Oberfläche magnetischer Aufzeichnungsträger

Country Status (4)

Country Link
US (1) US4514937A (enrdf_load_stackoverflow)
EP (1) EP0057859B1 (enrdf_load_stackoverflow)
JP (1) JPS57150139A (enrdf_load_stackoverflow)
DE (2) DE3103874A1 (enrdf_load_stackoverflow)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0652568B2 (ja) * 1983-02-14 1994-07-06 株式会社日立製作所 磁気ディスク媒体の製造方法及び製造装置
US4535567A (en) * 1983-08-26 1985-08-20 Seaborn Development, Inc. Computer magnetic media burnisher
JPS6059532A (ja) * 1983-09-12 1985-04-05 Fujitsu Ltd 磁気ディスク研摩ヘッド
JPS60145523A (ja) * 1984-01-10 1985-08-01 Nippon Telegr & Teleph Corp <Ntt> 磁気記録媒体とその製法
US4608037A (en) * 1984-04-23 1986-08-26 Rjr Archer, Inc. Method of and apparatus for abrading mechanically perforated cigarette filter tipping paper
DE3800196A1 (de) * 1988-01-07 1989-07-20 Basf Ag Verfahren zum bearbeiten der oberflaeche magnetischer aufzeichnungstraeger
US4930259A (en) * 1988-02-19 1990-06-05 Magnetic Perpherals Inc. Magnetic disk substrate polishing assembly
JPH081698B2 (ja) * 1988-04-19 1996-01-10 富士写真フイルム株式会社 磁気記録媒体の製法
DE3816561C1 (enrdf_load_stackoverflow) * 1988-05-14 1989-03-16 Harald 7121 Ingersheim De Schmid
JPH0775820B2 (ja) * 1988-09-16 1995-08-16 バンドー化学株式会社 ベルト材の研削装置
JP3232705B2 (ja) * 1991-12-05 2001-11-26 ソニー株式会社 光学記録ディスクからの樹脂材料の再生方法
JP2714316B2 (ja) * 1992-04-27 1998-02-16 株式会社日立製作所 磁気ディスク媒体の製造方法及び装置
US5586926A (en) * 1994-09-06 1996-12-24 Minnesota Mining And Manufacturing Company Method for texturing a metallic thin film
US5876270A (en) * 1995-02-28 1999-03-02 Sony Corporation Method and apparatus for polishing surface of magnetic recording medium
US5895312A (en) * 1996-10-30 1999-04-20 International Business Machines Corporation Apparatus for removing surface irregularities from a flat workpiece
US6062958A (en) 1997-04-04 2000-05-16 Micron Technology, Inc. Variable abrasive polishing pad for mechanical and chemical-mechanical planarization
US5885143A (en) * 1997-07-17 1999-03-23 Hitachi Electronics Engineering Co., Ltd. Disk texturing apparatus
JP4135301B2 (ja) * 2000-07-17 2008-08-20 ソニー株式会社 記録媒体の製造方法と製造装置
JP4090247B2 (ja) * 2002-02-12 2008-05-28 株式会社荏原製作所 基板処理装置
US8808459B1 (en) 2010-09-01 2014-08-19 WD Media, LLC Method for cleaning post-sputter disks using tape and diamond slurry
US9296082B1 (en) * 2013-06-11 2016-03-29 WD Media, LLC Disk buffing apparatus with abrasive tape loading pad having a vibration absorbing layer
GB201417861D0 (en) * 2014-10-09 2014-11-26 Rolls Royce Plc Abrasive processing method
US10014022B1 (en) 2017-01-04 2018-07-03 International Business Machines Corporation Flexible media burnishing apparatus and method
JP6920849B2 (ja) * 2017-03-27 2021-08-18 株式会社荏原製作所 基板処理方法および装置

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
US2895263A (en) * 1955-10-26 1959-07-21 Seiberling Rubber Co Method and apparatus for buffing shoe soles
US3415017A (en) * 1965-05-13 1968-12-10 Zech Murray Corp Apparatus for finishing workpieces under controlled pressures
US3524285A (en) * 1966-08-09 1970-08-18 Carborundum Co Control system for grinding machines
FR1536761A (fr) * 1966-09-16 1968-08-16 Disc Pack Corp Procédé et machine pour la finition de disques d'enregistrement de dispositifs à mémoire ou analogues et disques conformes à ceux ainsi obtenus
US3541735A (en) * 1968-08-05 1970-11-24 Sundstrand Engelberg Abrading machine
GB1275872A (en) * 1969-01-21 1972-05-24 Audio Magnetics Corp Vibration processing of magnetic tape
JPS5136043B2 (enrdf_load_stackoverflow) * 1971-08-11 1976-10-06
JPS5016996A (enrdf_load_stackoverflow) * 1973-06-18 1975-02-22
DE2416419C2 (de) * 1974-04-04 1984-01-05 Agfa-Gevaert Ag, 5090 Leverkusen Vorrichtung zum kontinuierlichen Reinigen von bandförmigen flexiblen Schichtträgern
US3943666A (en) * 1974-07-31 1976-03-16 Dysan Corporation Method and apparatus for burnishing flexible recording material
JPS53147512A (en) * 1977-05-30 1978-12-22 Hitachi Ltd Disc finishing device
DE2803914A1 (de) * 1978-01-30 1979-08-02 Basf Ag Verfahren und anordnung zum glaetten der oberflaeche von schichtaufzeichnungstraegern
JPS54136304A (en) * 1978-04-13 1979-10-23 Tdk Corp Disc form magnetic recording medium and polishing device
JPS5531570A (en) * 1978-08-28 1980-03-05 Nec Corp Disc machining device
JPS5922288B2 (ja) * 1978-12-07 1984-05-25 富士通株式会社 磁気デイスク媒体の製造方法
US4347689A (en) * 1980-10-20 1982-09-07 Verbatim Corporation Method for burnishing

Also Published As

Publication number Publication date
EP0057859A2 (de) 1982-08-18
JPS57150139A (en) 1982-09-16
JPH0319611B2 (enrdf_load_stackoverflow) 1991-03-15
DE3103874A1 (de) 1982-09-09
DE3271284D1 (en) 1986-07-03
US4514937A (en) 1985-05-07
EP0057859A3 (en) 1984-06-13

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