EP0539194B1 - Method and apparatus for ceramic ferrule bore lap processing - Google Patents

Method and apparatus for ceramic ferrule bore lap processing Download PDF

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Publication number
EP0539194B1
EP0539194B1 EP92309644A EP92309644A EP0539194B1 EP 0539194 B1 EP0539194 B1 EP 0539194B1 EP 92309644 A EP92309644 A EP 92309644A EP 92309644 A EP92309644 A EP 92309644A EP 0539194 B1 EP0539194 B1 EP 0539194B1
Authority
EP
European Patent Office
Prior art keywords
wire
blank
processing
bore
blanks
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 - Lifetime
Application number
EP92309644A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0539194A1 (en
Inventor
Isao C/O Nippon Mining Company Ltd. Maeda
Shinji C/O Takaho K. K. Niiho
Masahito C/O Nikko Consult. And Eng. Terasaki
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.)
Eneos Corp
Original Assignee
Japan Energy Corp
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 Japan Energy Corp filed Critical Japan Energy Corp
Publication of EP0539194A1 publication Critical patent/EP0539194A1/en
Application granted granted Critical
Publication of EP0539194B1 publication Critical patent/EP0539194B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
    • 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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
    • B24B5/485—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies using grinding wires or ropes

Definitions

  • This invention relates generally to precision ferrules for optical connectors used for connecting optical fibers and, more particularly, to a method and an apparatus for ceramic ferrule bore lap processing to form a bore in a ferrule with high precision.
  • ceramic ferrules are used popularly as precision ferrules for optical connectors.
  • An optical fiber can be centered by merely inserting the optical fiber through a very small bore of the ceramic ferrule.
  • bore lap machining i.e., boring and polishing
  • a capillary ferrule as shown in Fig. 3(A), which has a ceramic ferrule 110 provided in an end of a stainless steel casing 100, and an integral ceramic ferrule as shown in Fig. 3(B), which substantially entirely comprises a ceramic ferrule 110 provided at one end with a stainless steel casing 100.
  • raw materials i.e., blanks
  • Fig. 4(A) which is formed by extrusion molding and has a central bore 2 having a substantially constant diameter
  • Fig. 4(B) an injection-molded blank 1 as shown in Fig. 4(B)
  • Fig. 4(B) which is formed by injection molding and has a tapered central bore 2a.
  • the extrusion-molded blank 1 is bore machined in a manner as described below to be used broadly as the ceramic ferrule 110.
  • a plurality of, for instance 20 to 30, extrusion-molded ceramic blanks, through which a centering wire 6' is passed, are secured by solder 10 to a holder 8 with the wire 6' held taut. Then, the centering wire 6' is removed, and instead a tapered wire 6 for processing is inserted. Then, the blanks 1 are rotated together with the holder 8 while supplying grinding powder of an adequate grain size, and at the same time the wire 6 is reciprocated. In this way, a plurality of blanks 1 are bore processed simultaneously.
  • the solder 10 is removed, and the blanks 1 are removed from the holder 8 and washed.
  • the injection-molded blank 1 has features that it can be manufactured very precisely and that its central bore 2 may be made to be close to the inner diameter of the product. However, if the above method of processing is to be used, it is necessary to provide a large processing margin, which is undesired in view of making use of the features of the injection molding.
  • the method of bore lap processing on ceramic ferrules using extrusion-molded blanks although having an advantage that a large quantity of blanks can be processed at a time, inevitably dictates taking a large grinding margin (i.e., processing margin) to solve the problem of fluctuations of the central bore diameter with individual blanks. Consequently, excess time is required for the bore lap processing.
  • an injection-molded blank having a tapered central bore can not be bore lap processed because of the difficulty of aligning the central hole.
  • Japanese Patent Application No. 60-16362 Patent Abstract of Japan Vol. 9 Number 135 (M-386) (1858) of 11 June 1985 discloses apparatus for polishing a hole in a ceramic workpiece.
  • a tightly stretched wire which may have diamond grains bonded to its surface, is threaded through the hole to be polished.
  • the workpiece is placed in a holder which is guided for reciprocal movement parallel to the wire.
  • the hole is polished by rotating the workpiece while moving it to and fro along the wire.
  • An object of the invention accordingly, is to provide a method and an apparatus for ceramic ferrule bore lap processing, which permit satisfactory bore processing of an injection-molded blank having a tapered central hole as well, permits stable finish bore diameter and bore circularity to be obtained, permits reduction of the processing margin and permits bore processing without need of any skill and with satisfactory operation control.
  • a method of lap processing ceramic ferrule bores wherein a stretched processing wire to which grinding particles are applied is passed through a blank, and the blank is polished while rotating and with relative reciprocal motion between the blank and the wire, characterised in that a plurality of blanks are placed in a floating state on the wire, one blank is selected for processing, the blank is rotated while the wire is reciprocated, and then another blank is selected and bore processing is performed thereon in the same manner.
  • apparatus for lap processing a ceramic ferrule bore comprising a stretched processing wire to which grinding particles are applied, and a holder or chuck for a blank to be processed, through both of which the wire is passed, the holder being adapted to rotate the blank and the apparatus being operable to establish relative reciprocal motion between the wire and the holder, the apparatus further comprising powder supply means for supplying grinding particles to the wire, characterised in that the wire is reciprocable and driving means are provided for feeding the wire while causing reciprocation thereof, and the holder is adapted to hold a selected one of a plurality of blanks penetrated by the processing wire.
  • the embodiment concerns injection-molded blanks used to manufacture ceramic ferrules 110 for the integral ceramic ferrule shown in Fig. 3(B).
  • Fig. 2(A) shows an injection-molded blank 1 immediately after being injection-molded. Prior to the bore processing on this blank, burrs generated on the end 1b of the blank opposite the tapered end 1a at the time of gate removal in the injection molding are removed. Also, curved portions and tapers are removed using a center-less grinder or the like. Thus, the blank shown in Fig. 2(B) is obtained.
  • This preliminarily processed blank 1 is bore processed, that is, bore ground or polished, by the method of bore lap processing according to the invention.
  • Fig. 1 schematically shows a bore lap processing apparatus for carrying out the method according to the invention.
  • a processing wire 6 is stretched between a right and a left reel 12 and 14 mounted on the drive base 51. It can be fed while causing its reciprocation with suitable drive means, for instance by driving a belt 52 connected to the drive base 51 with a motor M1.
  • the processing wire 6 has a diameter slightly smaller than the finish bore diameter and is tapered by etching to reduce its diameter on the left side.
  • the wire 6 penetrates a blank chuck assembly 20.
  • the blank chuck assembly 20 has a chuck 22 for holding the blank 1 and a driver 24 for rotating the chuck 22.
  • the operation of the chuck 22 is controlled pneumatically or hydraulically.
  • the driver 24 has a pulley 26 driven from a motor M2 via a belt.
  • a plurality of, for instance 10 to 15, preliminarily processed blanks 1 are aligned by passing the wire 6 through them.
  • the blanks 1 are not secured but held in a floating state at a predetermined position (i.e., a work stock position) by stoppers 46 and 48, for instance. Then, only one blank 1 is moved manually or with a pawl (not shown) from the work stock position 44 along the wire 6 to be chucked in the chuck 22 of the chuck assembly 20.
  • the chuck 22 is rotated with the pulley 26 in a predetermined direction by driving the motor M2 and the driver 24. Meanwhile, the wire 6 is reciprocated as the belt connected to the driver base 51 is driven by the motor M1. Further, an adequate amount of diamond powder of a predetermined grain size for grinding is supplied, for instance at predetermined time intervals, to the wire 6 from a diamond powder feeder 40. Thus, the wire 6 with grinding particles attached thereto is fed to the position of the chuck 22, i.e., the bore grinding region of the blank 1.
  • the blanks 1 in the work stock positions 34 and 44 are held stationary by the stoppers without preventing the movement of the wire 6.
  • next blank 1 held in the upstream side work stock position 44 is fed to the chuck 22 and bore processed in the manner as described above.
  • the blanks 1 are bore processed one by one, and then the finish bore diameter and circularity of the blanks 1 are stabilized.
  • the processing margin can be minimized, thus permitting great reduction of the processing time.
  • the apparatus according to the invention is not limited to that in the above embodiment, and the processing wire driver may be replaced with other suitable ones.
  • the method and apparatus for ceramic ferrule lap processing according to the invention have the following effects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP92309644A 1991-10-23 1992-10-21 Method and apparatus for ceramic ferrule bore lap processing Expired - Lifetime EP0539194B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP304109/91 1991-10-23
JP3304109A JP2542982B2 (ja) 1991-10-23 1991-10-23 セラミックスフェル―ルの穴ラップ方法及び装置

Publications (2)

Publication Number Publication Date
EP0539194A1 EP0539194A1 (en) 1993-04-28
EP0539194B1 true EP0539194B1 (en) 1995-07-19

Family

ID=17929142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92309644A Expired - Lifetime EP0539194B1 (en) 1991-10-23 1992-10-21 Method and apparatus for ceramic ferrule bore lap processing

Country Status (3)

Country Link
EP (1) EP0539194B1 (ja)
JP (1) JP2542982B2 (ja)
DE (1) DE69203567T2 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103978423A (zh) * 2014-04-17 2014-08-13 宁波鱼化龙机电科技有限公司 一种陶瓷插芯加工用锡棒浇锡固定机
CN105312971A (zh) * 2015-08-07 2016-02-10 衡阳市中科光电子有限公司 一种陶瓷插芯穿线同轴磨床及其加工方法
US9987696B2 (en) 2009-05-22 2018-06-05 Sunnen Products Company Automated bore finishing process

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH691442A5 (de) * 1996-01-16 2001-07-31 Microcut Ltd Verfahren und Maschine zum Honen von Kleinstlöchern.
KR100413265B1 (ko) * 2001-04-11 2003-12-31 주식회사 코스텍시스 광섬유용 페룰의 내경 연마기
JP4523734B2 (ja) * 2001-04-16 2010-08-11 株式会社ツガミ 内径ラップ加工用ワイヤ及びワイヤ式内径ラップ加工方法
JP4523735B2 (ja) * 2001-04-16 2010-08-11 株式会社ツガミ ワイヤ式内径ラップ加工装置
KR100560194B1 (ko) * 2001-11-27 2006-03-13 나노솔루션주식회사 스크라이버 휠의 내경 가공 방법 및 이에 사용되는 장치
CN102172883A (zh) * 2011-03-18 2011-09-07 哈尔滨工业大学 一种硬脆材料高质量微细通孔的加工方法及装置
DE102013107447A1 (de) * 2013-07-15 2015-01-15 Zf Lenksysteme Gmbh Schleifwerkzeug zum Nachschleifen eines Gewindes
CN104162816A (zh) * 2014-05-30 2014-11-26 天津美嘉怡光电子器件有限公司 光纤专用特种陶瓷插芯内孔孔径加工方法
CN107116405B (zh) * 2017-06-21 2023-07-14 苏州速科德电机科技有限公司 夹持装置、内研磨电机及陶瓷插芯加工设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH335599A (de) * 1956-07-02 1959-01-15 Peter Geb Grandiermaschine für Lagersteine
JPS60263909A (ja) * 1984-06-13 1985-12-27 Daido Steel Co Ltd 光フアイバコネクタにおける中子の製造方法
JP2676517B2 (ja) * 1987-11-27 1997-11-17 日空工業株式会社 コンクリート用骨材の冷却装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9987696B2 (en) 2009-05-22 2018-06-05 Sunnen Products Company Automated bore finishing process
CN103978423A (zh) * 2014-04-17 2014-08-13 宁波鱼化龙机电科技有限公司 一种陶瓷插芯加工用锡棒浇锡固定机
CN105312971A (zh) * 2015-08-07 2016-02-10 衡阳市中科光电子有限公司 一种陶瓷插芯穿线同轴磨床及其加工方法

Also Published As

Publication number Publication date
DE69203567T2 (de) 1996-04-04
JP2542982B2 (ja) 1996-10-09
JPH05113523A (ja) 1993-05-07
EP0539194A1 (en) 1993-04-28
DE69203567D1 (de) 1995-08-24

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