EP0364514A1 - Agencements pour lapidaires a deux disques. - Google Patents

Agencements pour lapidaires a deux disques.

Info

Publication number
EP0364514A1
EP0364514A1 EP89902018A EP89902018A EP0364514A1 EP 0364514 A1 EP0364514 A1 EP 0364514A1 EP 89902018 A EP89902018 A EP 89902018A EP 89902018 A EP89902018 A EP 89902018A EP 0364514 A1 EP0364514 A1 EP 0364514A1
Authority
EP
European Patent Office
Prior art keywords
disc
upper tool
tool spindle
spindle
working
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.)
Granted
Application number
EP89902018A
Other languages
German (de)
English (en)
Other versions
EP0364514B1 (fr
Inventor
Arthur Werner Stahli
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0364514A1 publication Critical patent/EP0364514A1/fr
Application granted granted Critical
Publication of EP0364514B1 publication Critical patent/EP0364514B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
    • B24B37/08—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for double side lapping
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/005—Control means for lapping machines or devices
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/16—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load

Definitions

  • the present invention relates to a device on a two-disc lapping machine for bringing an upper tool disc into its working position according to the preamble of patent claim 1.
  • Two-disc lapping machines have been known for around 40 to 50 years. Workpieces to be machined are drawn through and machined by so-called rotor disks by means of an inner and outer pin ring between the two tool disks. With two-disc lapping machines, it is possible to achieve a very high degree of parallelism between the machined surfaces of the workpieces. With the advent of new technologies, such as the manufacture of silicon wafers for integrated circuits, the manufacture of quartz crystals or the finest ceramic plates, ever increasing demands have also been placed on lapping machines. Particularly when processing extremely thin-walled materials, the greatest attention should be paid to the working pressure control of the upper tool disc of double disc lapping machines. Machines are required today in which the feed of the upper
  • Tool disk takes place as quickly as possible until immediately before the tool disk touches the surface of the workpieces to be machined.
  • the placement of the upper tool disk on the machining surface of the workpieces should be as fine as possible, practically without pressure.
  • the working pressure has to be continuously increased according to certain regulations during the machining of the workpieces and reduced again at the end of the machining, in order to finally reach the upper one Tool disc, for emptying the lapping machine, to be lifted off the workpieces and swiveled to the side.
  • the upper tool disc is in most cases suspended from a spindle which can be driven by a motor and axially displaceable.
  • the spindle is connected to a radially pivotable column stand of the lapping machine via a bearing component.
  • the upper tool disk attached to the lower end of the spindle can be fed, placed and pressed onto the workpiece by means of a hydraulic or pneumatic cylinder drive which engages the axially displaceable spindle.
  • the cylinder drive must first compensate for the weight of the upper tool disc, which is up to several 1,000 * Newton, bring the tool disc to the workpiece, as described above, put it on slowly and begin the load by reducing the weight compensation.
  • the machine equipped with the device according to the invention is structurally much simpler in construction.
  • Fig. 2 is a supervision
  • Fig. 3 is a front view of the device according to the invention on a two-disc lapping machine.
  • the lapping machine comprises a column stand 3 which is mounted and guided in a stand guide 2.
  • the stand guide 2 is rigidly connected to the frame of the machine in a manner not shown.
  • a bar 11 is arranged essentially at right angles to it and is pivotably mounted approximately in the middle.
  • the beam 11 consists of two essentially parallel mutually extending longitudinal beams 11a which are connected to one another at their rear end 28 by cross beams 11b and at their front end 13 by a headstock 14. Seen approximately in the center in the longitudinal direction of the longitudinal beams 11a, an axis 12 runs at right angles to the longitudinal beams 11a through a bore in the latter and in the column stand. The beam 11 is pivotally supported by the axis 12.
  • the headstock 14 arranged at the front end between the longitudinal beams 11a supports the tool spindle 15. At the lower end of the mentioned tool spindle 15, the upper tool disk 21 is articulated via a joint head 20.
  • an electric motor as the first drive means 17 is preferably arranged on the front part of the beam behind the headstock 14 and connected to the latter.
  • the electric motor 17 is equipped with a reduction gear 18 and, via a transmission means 19, for example a belt drive, serves to drive the tool spindle 15.
  • a transmission means 19 for example a belt drive
  • the tool spindle 15 is mounted in the headstock 14 without the possibility of axial displacement.
  • the column stand 3 has in its upper region a counter-holder 27 pointing rearward and running essentially parallel to the beam 11.
  • the counterhold 27 comprises two supports 27a which run parallel to one another and are essentially tangentially connected to the column stand 3 and have a spacing from one another.
  • At the rear end 28 of the beam 11 there is a first connection between the longitudinal beams 11a via a first bearing axis 31.
  • Adjustment means 29 pivotally connected to the beam 11.
  • the first adjusting means 29 has the task of compensating the weight of the upper tool disk 21 of up to several 100,000 Newtons and of keeping the bar 11 in a substantially horizontal position.
  • a second adjusting means 30, which preferably also consists of a pneumatic or hydraulic cylinder drive, is, as just described, connected to the rear beam end 28 of the beam 11 via a third bearing axis 33 and to the counter holder 27 via a fourth bearing axis 34. This cylinder drive serves to control the working pressure of the upper tool disk 21.
  • a travel limiting device 37, 38, 41 arranged at the rear end 28 of the beam 11 has the task of limiting the pivoting movement of the beam 11.
  • the construction is designed such that the mentioned pivoting movement of the beam 11 at the front end 13 is at most 20 mm.
  • the path limiting device consists of a groove 41 which is worked into a cross member 11b of the beam 11 at the rear beam end 28.
  • the pivoting movement of the bar 11 can also be adjusted with an adjustable stop 38 arranged in the counter holder 27.
  • the column stand 3 has at its lower end a concentrically arranged, with an internal thread see hole 5 on.
  • a lifting spindle 4 which can be driven by means of, for example, an electric motor 6 as a second drive means via a gear 7, engages in the thread of the bore 5 for lifting and lowering the column stand 3.
  • the motor 6 with the gear 7 and the lifting spindle 4 are connected to the frame of the lapping machine.
  • a further essential feature of the device according to the invention is that there is a functional separation between bringing the tool disk 21 into its working position and controlling the working pressure of the tool disk 21 on the surface of the workpieces 23.
  • the feeding takes place by the lowering movement of the column stand 3 by means of the lifting spindle 4 and the control of the working pressure takes place by applying a deflecting force to the beam 11 via the second cylinder drive 30.
  • the pivoting movement and thus the deflection of the beam 11 can be measured with a second measuring device 39.
  • the first and the second measuring means 8, 39 and the sensor 16 for measuring the workpiece thickness are connected to a control device of the lapping machine, not shown.
  • the control device processes those received from the measuring means 8, 39 and from the sensor 16
  • the lower end of the column stand 3 is flanged to a swivel cylinder 10.
  • the swivel cylinder 10 serves to swivel the column stand 3 with the upper tool disk 21.
  • the swivel position is shown in FIG. 2.
  • the latter can be locked by means of a clamping cylinder 9 arranged in the stand guide 2.
  • the upper working disk 21 always has a position parallel to the lower working disk 22 despite the pivoting movement of the beam 11, the upper tool disk is connected to the lower end of the tool spindle via a joint head 20.
  • the lateral offset of the upper tool disk 21 to the lower tool disk 22 which occurs as a result is negligible.
  • a lapping process with the device according to the invention on a two-disc lapping machine is described below.
  • the column stand 3 is in a raised position and the upper tool disk 21 is in the pivoted-out position.
  • the workpieces 23 to be machined are placed in the receiving openings of the rotor disk 24 on the surface of the lower tool disk 22.
  • the upper tool disc 21, which is in the swiveled-out position is swiveled in.
  • the swiveled-in position is limited, for example, by a stop (not shown) such that the two tool disks 21, 22 lie one above the other centrally.
  • the thickness of the unworked workpieces plus a tolerance of preferably 0.2 mm is entered into the control device (not shown) as the feed dimension for the upper tool disk.
  • the upper tool disk 21 is rapidly lowered in the direction of the surface of the workpieces 23 via the lifting spindle 4.
  • the control device monitors the signal from the first measuring means 8 and ensures that the lowering movement of the column stand 3 is stopped in good time, shortly before the upper tool disc 21 touches the surface of the workpieces 23.
  • the first cylinder drive 29 keeps the bar 11 permanently in a horizontal position. A small, upward force is exerted with the second cylinder drive 30. As a result, the upper tool disk 21 lowers slowly and without any appreciable working pressure onto the surface of the workpieces 23.
  • the lapping process can begin.
  • a time-based program which is stored, for example, in the control device of the lapping machine (not shown)
  • the control device continuously monitoring the workpiece thickness on the basis of the signal supplied by the sensor 16 and the working pressure of the tool disk 21 via the controls the second cylinder drive 30 on the basis of the set program which is dependent on the workpiece to be machined.
  • the vertical position of the column stand 3 is secured with the clamping cylinder 9 during the machining process.
  • the working pressure of the upper tool disc is reduced and the beam 11 is brought into the horizontal position by the first cylinder drive 29.
  • the rotational movements of the tool disks 21, 22, the pin rings 25 and / or 26 are switched off.
  • the column stand 3 is raised by actuating the lifting spindle 4.
  • the swivel cylinder 10 With the swivel cylinder 10, the upper tool disk 21 is brought back into the swiveled-out position.
  • the lapping The machine can be unloaded and loaded with new workpieces 23 to be machined.
  • the two cylinder drives 29, 30 enable the upper tool disk 21 to be precisely controlled in terms of working pressure, since the otherwise usual shifting cylinder with the known disadvantageous holding torque (slip-stik) and with the pressure reversal occurring during the working process are eliminated.
  • a previously existing accident source is practically eliminated, since the upper spindle 21 can no longer be inadvertently lowered by the lifting spindle 4. Due to the balance beam principle, the column stand 3 is loaded relatively little. The rearing up of the column stand known from other types of double-disc lapping machines is thereby avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Une poutre (11) est montée par son milieu sur l'extrémité supérieure d'un montant (3) radialement pivotable, perpendiculairement à celui-ci, de manière à osciller. Une broche d'outil (15) est montée de manière à osciller. Une broche d'outil (15) est montée de manière fixe dans le sens axial à l'extrémité antérieure de la poutree (11) dans une poupée fixe (14) reliée à la poutre et peut être entraînée par un premier dispositif d'entraînement (17). Le disque supérieur de lapidage (21) est fixé par une tête articulée (20) à l'extrémité inférieure de la broche d'outil (15). Afin d'amener le disque de lapidage (21) à sa position de travail le montant (3) monté et guidé dans le guide (2) peut être levé et abaissé par une tige de montée et de descente (4) susceptible d'être levé et abaissé par une tige de montée et de descente (4) suceptible d'être entraînée par une deuxième dispositif d'entraînement (6). Un premier organe d'ajustement (29) qui accroche l'extrémité postérieure (28) de la poutre (11) sert à maintenir celle-ci dans une position essentiellement horizontale. Un deuxième organe d'ajustement (30) qui accroche lui aussi l'extrémité postérieure (28) de la poutre sert à ajuster la pression de travail du disque de lapidage (21). En supprimant la mobilité axiale de la broche d'outil (15), cet agencement permet de résoudre avec une construction très simple le problème de la suspension, du montage et de l'entraînement du disque de travail (21). La pression de travail du disque de travail peut être ajustée de manière extrêmement précise. Les lapidaires ainsi agencés conviennent en particulier pour usiner des tranches, des quartz et des plaquettes en céramique à parois minces.
EP89902018A 1988-04-07 1989-02-17 Agencements pour lapidaires a deux disques Expired - Lifetime EP0364514B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1277/88 1988-04-07
CH1277/88A CH684321A5 (de) 1988-04-07 1988-04-07 Einrichtung an einer Zweischeibenläppmaschine.

Publications (2)

Publication Number Publication Date
EP0364514A1 true EP0364514A1 (fr) 1990-04-25
EP0364514B1 EP0364514B1 (fr) 1991-12-18

Family

ID=4206657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89902018A Expired - Lifetime EP0364514B1 (fr) 1988-04-07 1989-02-17 Agencements pour lapidaires a deux disques

Country Status (4)

Country Link
US (1) US5317837A (fr)
EP (1) EP0364514B1 (fr)
CH (1) CH684321A5 (fr)
WO (1) WO1989009679A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102380800A (zh) * 2010-09-06 2012-03-21 无锡瑞茂光电科技有限公司 连体式主轴编码器

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2677291B1 (fr) * 1991-06-06 1995-12-15 Commissariat Energie Atomique Machine de polissage a controle de pression.
GB9402140D0 (en) * 1994-02-04 1994-03-30 Actis Uk Limited Grainger Alla Lapping machine
JPH08257902A (ja) * 1995-03-28 1996-10-08 Ebara Corp ポリッシング装置
US5632669A (en) * 1995-05-26 1997-05-27 Censtor Corporation Interactive method for lapping transducers
US5653624A (en) * 1995-09-13 1997-08-05 Ebara Corporation Polishing apparatus with swinging structures
USRE38340E1 (en) * 1996-11-04 2003-12-02 Seagate Technology Llc Multi-point bending of bars during fabrication of magnetic recording heads
US5951371A (en) * 1996-11-04 1999-09-14 Seagate Technology, Inc. Multi-point bending of bars during fabrication of magnetic recording heads
US6475064B2 (en) 1996-12-13 2002-11-05 Seagate Technology Llc Multipoint bending apparatus for lapping heads of a data storage device
US6287170B1 (en) 1996-12-13 2001-09-11 Seagate Technology Llc Multipoint bending apparatus for lapping heads of a data storage device
TW377467B (en) * 1997-04-22 1999-12-21 Sony Corp Polishing system, polishing method, polishing pad, and method of forming polishing pad
JPH11207608A (ja) * 1998-01-22 1999-08-03 Speedfam Co Ltd 平面研磨装置における上定盤昇降機構
US6217425B1 (en) * 1998-06-12 2001-04-17 Tdk Corporation Apparatus and method for lapping magnetic heads
US6083082A (en) * 1999-08-30 2000-07-04 Lam Research Corporation Spindle assembly for force controlled polishing
ITTV20020049A1 (it) * 2002-04-22 2003-10-22 Luca Toncelli Struttura di sostegno del mandrino in una macchina utensile e procedimento per la sua realizzazione
CN104924197A (zh) * 2015-05-28 2015-09-23 海宁奇晟轴承有限公司 一种自动双盘研磨机
CN113211212A (zh) * 2021-05-08 2021-08-06 万冬冬 一种用于基层墙面校平便于粉刷石膏砂浆涂刷的辅助装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1377119A (en) * 1920-03-15 1921-05-03 Pike Mfg Company Machine for shaping sharpening-stones
US1843300A (en) * 1929-03-25 1932-02-02 Norton Co Lapping machine
US2238859A (en) * 1939-09-15 1941-04-15 Norton Co Lapping machine
US2603041A (en) * 1945-09-27 1952-07-15 Alfred J Bowen Surface grinder
US2840957A (en) * 1957-06-07 1958-07-01 Walter J Warden Lapping device
CH412612A (de) * 1964-07-29 1966-04-30 Kunz Beck Emil Schleifmaschine
US3461617A (en) * 1965-08-18 1969-08-19 Miles Machinery Co Methods and apparatus for lapping workpieces
JPS603948B2 (ja) * 1975-09-16 1985-01-31 日本電信電話株式会社 研摩装置
US4315383A (en) * 1980-05-13 1982-02-16 Spitfire Tool & Machine, Co. Inc. Inner gear drive for abrading machines
US4450652A (en) * 1981-09-04 1984-05-29 Monsanto Company Temperature control for wafer polishing
NL8301700A (nl) * 1982-05-18 1983-12-16 Mueller Georg Nuernberg Slijpwerkwijze en inrichting voor het uitvoeren van de werkwijze alsmede bewerking van werkstukken uit bros-brokkelige materialen.
JPS6034266A (ja) * 1983-08-08 1985-02-21 Toshiba Corp 研磨方法
DE3520713A1 (de) * 1985-06-10 1986-12-11 Fa. Peter Wolters, 2370 Rendsburg Steuervorrichtung fuer den bearbeitungsdruck an laepp-, hon- und poliermaschinen
US4837982A (en) * 1987-12-02 1989-06-13 Kwik-Way Manufacturing Corporation Control circuit for a honing machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8909679A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102380800A (zh) * 2010-09-06 2012-03-21 无锡瑞茂光电科技有限公司 连体式主轴编码器

Also Published As

Publication number Publication date
WO1989009679A1 (fr) 1989-10-19
US5317837A (en) 1994-06-07
EP0364514B1 (fr) 1991-12-18
CH684321A5 (de) 1994-08-31

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