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US20030114085A1 - Superabrasive composition and superabrasive article comprising same for grinding CRT front panel - Google Patents

Superabrasive composition and superabrasive article comprising same for grinding CRT front panel Download PDF

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Publication number
US20030114085A1
US20030114085A1 US09/966,665 US96666501A US2003114085A1 US 20030114085 A1 US20030114085 A1 US 20030114085A1 US 96666501 A US96666501 A US 96666501A US 2003114085 A1 US2003114085 A1 US 2003114085A1
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US
United States
Prior art keywords
grinding
superabrasive
composition
particles
grinding layer
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.)
Abandoned
Application number
US09/966,665
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English (en)
Inventor
Sung-Kook Choi
Hyun-Myung Cho
Young-Mo Kang
Hun-Jin Lee
Jang-Soo Choi
Jong-Beg Chun
Han-Baik Lee
Kyoung-Jun Kim
Chan-Hae Hwang
Hyuck-Jae Jung
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.)
Corning Precision Materials Co Ltd
Ehwa Diamond Industrial Co Ltd
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
Assigned to SAMSUNG CORNING CO., LTD., EHWA DIAMOND IND CO,. LTD reassignment SAMSUNG CORNING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, KYOUNG-JUN, CHUN, JONG-BEG, HWANG, CHAN-HAE, JUNG, HYUCK-JAE, CHOI, JANG-SOO, LEE, HAN-BAIK, CHO, HYUN-MYUNG, CHOI, SUNG-KOOK, KANG, YOUNG-MO, LEE, HUN-JIN
Assigned to EHWA DIAMOND IND. CO., LTD. reassignment EHWA DIAMOND IND. CO., LTD. INVALID ASSIGNMENT. SEE RECORDING AT REEL 012375, FRAME 0484. ( RE-RECORD TO CORRECT MICROFILM PAGES) Assignors: CHUN, JONG-BEG, CHOI, SANG-SOO, HWANG, CHAN-HAE, KIM, KYOUNG-JUN, JUNG, HYUCK-JAE, LEE, HAN-BAIK, CHO, HYUN-MYUNG, CHOI, SUNG-HOOK, KANG, YOUNG-MO, LEE, HUN-JIN
Assigned to SAMSUNG CORNING CO., LTD. reassignment SAMSUNG CORNING CO., LTD. INVALID ASSIGNMENT. SEE RECORDING AT 012375, FRAME 0484. (RE-RECORD TO CORRECT MICROFILM PAGES) Assignors: LEE, HAN-BAIK, CHUN, JONG-BEG, HWANG, CHAN-HAE, JUNG, HYUCK-JAE, CHOI, JANG-SOO, KIM, KYOUNG-JUN, CHO, HYUN-MYUNG, CHOI, SUNG-KOOK, KANG, YOUNG-MO, LEE, HUN-JIN
Publication of US20030114085A1 publication Critical patent/US20030114085A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • B24D3/10—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for porous or cellular structure, e.g. for use with diamonds as abrasives
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/015—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor of television picture tube viewing panels, headlight reflectors or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • C09K3/1409—Abrasive particles per se

Definitions

  • the present invention relates to a superabrasive composition for grinding the front panel of a cathode ray tube, which comprises a mixture of diamond and cubic boron nitride particles in a specified ratio dispersed in a bonding material, also to a superabrasive article formed in a specified shape using said composition.
  • a cathode ray tube is comprised of a face glass panel and a funnel glass body which are separately prepared by hot-press molding a glass goat.
  • the resulting hot-press molded glass is subjected to a sequential grinding process using abrasive materials such as garnet, pumice and rouge lap to provide a finished front glass panel having a smooth surface for screen display.
  • Such a superabrasive material is combined with a bonding material and sintered to provide a superabrasive grinding article, whose performance characteristics are influenced by particle size, hardness, grade and structure of the superabrasive particles, as well as by the kind of bonding material used and the porosity of the sintered composite thereof.
  • a grinding article for grinding CRT front panel may be formed in various shapes as disclosed in various documents.
  • Korean Patent Laid-open Publication No. 95-25832 discloses a superabrasive article for grinding the front glass panel of CRT, in the form of a rubber pad having implanted buttons of diamond particles.
  • this article does not generate wastewater, when diamond particles are employed alone as a grinding material, the ground surface is glazed.
  • a superabrasive composition for grinding the front glass panel of a cathode ray tube which comprises superabrasive particles and a bonding material, the superabrasive particles being a mixture of diamond particles and cubic boron nitride (CBN) particles in a mix ratio of 8.5:1.5 to 9.5:0.5 in volume.
  • CBN cubic boron nitride
  • a grinding article for grinding the front glass panel of a cathode ray tube which comprises a superabrasive grinding layer formed by sintering the inventive superabrasive composition and a substrate element for securing the superabrasive grinding layer, said grinding layer has a cylindrical protrusion extending outward from a portion of bottom surface thereof, and the substrate element, which has on a portion of the top surface thereof a dimple which is shaped to closely receive said cylindrical protrusion, is tightly bonded to the grinding layer forming an interface which extends from the remaining portion of the bottom surface of the grinding layer to the surface of said protrusion.
  • FIG. 1 a perspective view of an example of a superabrasive article according to the present invention
  • FIG. 2 a cross-sectional view taken along the face A-A′ of the superabrasive article of FIG. 1;
  • FIGS. 3 and 4 two examples of means for firmly securing the grinding layer on a substrate element in the inventive superabrasive grinding article
  • FIG. 5 a conventional means for attaching the grinding layer to a substrate element
  • FIG. 6 the variation in the grinding efficiency of superabrasive grinding articles prepared using a metallic bonding material, depending on the sintering conditions.
  • the superabrasive composition of the present invention is characterized in that a specific mixture of diamond and cubic boron nitride (CBN) particles is employed as a superabrasive material, i.e., in accordance with the present invention, the mix ratio of diamond particles and CBN particles is in the range of 8.5:1.5 to 9.5:0.5 in volume.
  • CBN particles cubic boron nitride
  • the mix ratio of diamond particles and CBN particles is in the range of 8.5:1.5 to 9.5:0.5 in volume.
  • the mixed superabrasive particles are combined with a bonding material in a mix ratio of 1.5:8.5 to 2.5:7.5 by volume, to provide the inventive composition.
  • the bonding material may be metallic or a mixture of a metal oxide and a resin, and it functions to disperse and tightly hold the superabrasive particles during a high pressure sintering process to give a highly compacted composite having a high degree of physical integrity.
  • a metallic bonding material which may be used in the present invention, include particles of Fe, Cu, Sn, an oxide thereof having an average particle size ranging from 30 to 50 ⁇ m.
  • the resin may be preferably a phenol resin, and combined with the metal oxide component in a mix ratio of 9:1 to 7:3.
  • lie inventive superabrasive composition is subjected to a hot press-molding process to provide the inventive grinding article having the specified structure.
  • the hot press-molding process may be carried out by incorporating the inventive superabrasive composition into a mold to be hot-pressed under a high-temperature, high-pressure condition, the mold holding a pre-fabricated substrate element designed for securing the grinding layer generated by sintering the inventive composition.
  • the hot press-molding process may be suitably conducted at a temperature ranging from 150 to 800° C. and a pressure ranging from 0.1 to 0.5 ton/cm 2 , depending on the component of the bonding material used, in a vacuum electrical furnace.
  • the sintering-molding process may be conducted at a high temperature of 650 to 750° C., under a pressure of 0.1 to 0.25 ton/cm 2
  • the sintering-molding may be conducted at a low temperature ranging from 150 to 200° C., under a pressure of 0.25 to 0.35 ton/cm 2 , although the condition may be varied depending on the Tg (glass transition temperature) and decomposition temperature of the resin used.
  • the mold and the securing substrate element may be made of a stainless steel, carbon steel or other materials conventionally known in the art, and the mold is sealed during the hot press-molding process conducted in a vacuum.
  • the substrate element is pre-shaped to have a dimple so that the grinding layer obtained by sintering the inventive composition can be firmly attached thereto. That is, in the inventive grinding article, the grinding layer has a cylindrical protrusion extending from the bottom surface thereof toward the inside of the dimple of the sintered element in a tightly locking manner.
  • a specific structural feature such as a flange, circumferential groove or screw groove may be further provided to the interface between the grinding layer and the substrate element.
  • the grinding article for grinding the front glass panel of a CRT according to the present invention may be shaped in a form, e.g., a round or a rectangular pad, suitable for the selected method of grinding.
  • a round pad form is preferably used for a LAP machine which operates in a rotational mode
  • a rectangular pad form for AGM which operates in an oscillational mode.
  • the particle size and the toughness index of the superabrasive particles may be suitably controlled.
  • the bonding material comprises a resin component
  • a rotational grinding tool is used
  • the superabrasive particles preferably have an average particle size of 75 to 90 ⁇ m and a toughness index of 50 to 60, while when an oscillation method is used, it is preferred that the average particle size is smaller, in the range of 30 to 38 ⁇ m.
  • the superabrasive particles preferably have an average particle size of 75 to 90 ⁇ m and a toughness index of 50 to 60, like the above case, but when a vibrational grinding method is selected, the average particle size of the superabrasive particles preferably range from 30 to 38 ⁇ m, and the toughness indexes of the diamond and CBN particles, from 50 to 60, and from 40 to 50, respectively.
  • the particle size is greater than the upper limit, the surface of the polished glass panel becomes too rough, while if it is smaller than the lower limit, the grinding efficiency decreases. Further, if the toughness index is greater than the upper limit, the abrasive particles do not sufficiently break out at a suitable rate to renew the grinding surface and the grinding surface tends to get glazed, while if it is lower than the lower limit, the use life becomes short.
  • FIG. 1 represents a perspective view of one embodiment of the grinding article of the present invention
  • FIG. 2 shows a cross-sectional view thereof taken along the face A-A′ in FIG. 1.
  • the inventive superabrasive grinding article ( 100 ) consists of a superabrasive grinding layer ( 110 ) and a substrate element ( 120 ) for securing the grinding layer, wherein the bottom part of the grinding layer ( 110 ) has a cylindrical protrusion with a circular flange ( 141 ) positioned at the lower end thereof, which extends into, and closely fits the preformed substrate element ( 120 ).
  • the lower portion of the substrate element ( 120 ) is equipped with a circular groove ( 130 ) at the outside surface thereof, which is used for loading the grinding article to a carrier such as a rubber pad.
  • the circular flange ( 141 ) prevents the grinding layer from detaching from the substrate element when the article is subjected to a vibrational motion in the axial direction.
  • FIGS. 3 and 4 represent two other embodiments of the inventive grinding article.
  • the means for attaching the superabrasive grinding layer to the substrate element have an additional structural feature, i.e., a circumferential groove ( 142 ) positioned at the bottom surface ( 160 ) of the grinding layer ( 110 ), or a screw groove ( 143 ) provided on the outer surface of the cylindrical protrusion ( 140 ).
  • a bonding material composed of 75 wt % of a bronze-based powder (M325, a product of KENNAMETAL COMPANY, U.S.A) and 25 wt % of a tin powder were superabrasive particles of diamond and CBN in various ratios as shown in Table 1, the amount of superabrasive particles being 25% by volume based on the total weight of the resulting mixture, and the resulting mixture was homogenized using a tumbler mixer to obtain various superabrasive compositions.
  • the mold was sealed with a carbon punch, placed in a vacuum electric furnace, and subjected to sintering under a pressure of 0.2 ton/cm 2 for 20 minutes at 700° C., to provide a sintered, superabrasive grinding article having the shape shown in FIGS. 1 and 2.
  • Example 1 The procedure of Example 1 was repeated except that while fixing the diamond to CBN mix ratio at 9.5:0.5, the amount, the average particles size and the toughness index of the superabrasive particles used were varied as shown in Table 2, to provide superabrasive grinding articles.
  • the superabrasive grinding device was loaded in an LAP machine and employed in grinding a 15′′ CRT glass panel for 30 seconds at 5.5-7 Hz and 0.15 kgf/cm 2 .
  • the grinding efficiency and the roughness of the machined surface were measured.
  • the apparatus used for measuring the surface roughness was Surftest301 TM (stylus type) of Japan, Mitsutoyo Company.
  • Run 2-6 90 ⁇ 75 60 ⁇ 80 5 48 8.2 Com.
  • Run 2-7 90 ⁇ 75 40 ⁇ 50 25 31 6.1 Com.
  • Run 2-8 90 ⁇ 75 40 ⁇ 50 20 29 5.9 Com.
  • Run 2-9 90 ⁇ 75 40 ⁇ 50 15 27 6.3 Com.
  • Run 2-10 90 ⁇ 75 40 ⁇ 50 10 30 5.7 Com.
  • Run 2-11 90 ⁇ 75 40 ⁇ 50 5 33 6.7 Com.
  • Run 2-12 106 ⁇ 90 60 ⁇ 80 25 65 13.1 Com.
  • Run 2-13 106 ⁇ 90 60 ⁇ 80 15 67 9.8 Com.
  • Run 2-14 106 ⁇ 90 60 ⁇ 80 5 75 10.1 Com.
  • Run 2-15 106 ⁇ 90 50 ⁇ 60 25 60 11.2 Com.
  • Run 2-16 106 ⁇ 90 50 ⁇ 60 15 58 10.1 Com. Run 2-17 106 ⁇ 90 50 ⁇ 60 10 55 11.2 Com. Run 2-18 106 ⁇ 90 50 ⁇ 60 5 64 12.1 Com. Run 2-19 106 ⁇ 90 40 ⁇ 50 25 53 9.6 Com. Run 2-20 106 ⁇ 90 40 ⁇ 50 15 49 10.0 Com. Run 2-21 106 ⁇ 90 40 ⁇ 50 5 51 10.8 Com. Run 2-22 75 ⁇ 63 60 ⁇ 80 15 22 5.1 Com. Run 2-23 75 ⁇ 63 50 ⁇ 60 5 2 4.8 Com. Run 2-24 75 ⁇ 63 40 ⁇ 50 25 25 6.0 Com. Run 2-25 75 ⁇ 63 40 ⁇ 50 15 18 5.4 Com. Run 2-26 75 ⁇ 63 30 ⁇ 40 5 20 5.1
  • Example 2 The procedure of Example 1 was repeated except that while fixing the diamond to CBN mix ratio at 9.5:0.5, the amount, particles size and toughness index of the superabrasive particles were varied as shown in Table 2, to provide a number of superabrasive grinding articles, which were each implanted in a rectangular rubber pad to prepare a grinding device.
  • the grinding device thus obtained was loaded in an A.G.M. (orbital Aspherical Grinding Machine) (operated in an oscillation mode), and employed in grinding a 29′′ CRT glass panel for 35 seconds at 5.5-7 Hz and 0.15 kgf/cM 2 .
  • the grinding efficiency and the roughness of the machined surface were measured as in Example 2. The result is shown in Table 3.
  • Run 3-5 30 ⁇ 38 60 ⁇ 80 15 64 5.9 Com.
  • Run 3-6 30 ⁇ 38 60 ⁇ 80 5 62 6.2 Com.
  • Run 3-7 30 ⁇ 38 40 ⁇ 50 25 78 4.0 Com.
  • Run 3-8 30 ⁇ 38 40 ⁇ 50 20 75 3.8 Com.
  • Run 3-9 30 ⁇ 38 40 ⁇ 50 15 74 3.9 Com.
  • Run 3-10 30 ⁇ 38 40 ⁇ 50 10 76 3.8 Com.
  • Run 3-11 30 ⁇ 38 40 ⁇ 50 5 71 4.0 Com.
  • Run 3-12 38 ⁇ 45 60 ⁇ 80 25 84 9.2 Com.
  • Run 3-13 38 ⁇ 45 60 ⁇ 80 15 87 9.4 Com.
  • Run 3-14 38 ⁇ 45 60 ⁇ 80 5 88 9.4 Com.
  • Run 3-15 38 ⁇ 45 50 ⁇ 60 25 78 7.5 Com.
  • Run 3-16 38 ⁇ 45 50 ⁇ 60 15 78 8.2 Com.
  • Run 3-17 38 ⁇ 45 50 ⁇ 60 10 80 9.4 Com.
  • Run 3-18 38 ⁇ 45 50 ⁇ 60 5 84 9.2 Com.
  • Run 3-19 38 ⁇ 45 40 ⁇ 50 25 79 7.6 Com.
  • Run 3-20 38 ⁇ 45 40 ⁇ 50 15 76 8.1 Com.
  • Run 3-21 38 ⁇ 45 40 ⁇ 50 5 79 8.5 Com.
  • Run 3-22 20 ⁇ 30 60 ⁇ 80 15 42 3.2 Com.
  • Run 3-23 20 ⁇ 30 50 ⁇ 60 5 49 3.5 Com.
  • Run 3-24 20 ⁇ 30 40 ⁇ 50 25 38 3.5 Com.
  • Run 3-25 20 ⁇ 30 40 ⁇ 50 15 46 3.4 Com.
  • Run 3-26 20 ⁇ 30 30 ⁇ 40 5 42 3.1
  • Example 1 The procedure of Example 1 was repeated except that while fixing the diamond to CBN mix ratio at 9.5:0.5, the average particle size at 50 to 60 ⁇ m, and the toughness index at 90 to 75, the sintering temperature and pressure were varied as shown in FIG. 6, to provide grinding articles having various sintered characteristics.
  • the grinding efficiency of each of the grinding articles thus prepared was measured and represented by a relative value based on 10 set for the value obtained for the grinding article prepared by sintering at 700° C. and 0.10 ton/cm 2 . The result is shown in FIG. 6.
  • FIG. 6 shows that a grinding article prepared using a bronze-based metal as a bonding material is suitably sintered at a temperature of 650 to 750° C. and a pressure of 0.10 to 0.25 ton/cm 2 .
  • Example 1 The procedure of Example 1 was repeated using a 9.5:0.5 mixed powder of diamond and CBN having a particle size of 50 to 60 ⁇ m and a toughness index of 90 to 75, except for conducting additional runs using a phenol resin composition containing 10 to 30% of iron oxide as a bonding material using a steel mold and sintering at a condition of 160 to 170° C. and 0.25 to 0.35 ton/cm 2 , to provide two types of grinding articles having the structure as shown in FIG. 2.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US09/966,665 2000-09-27 2001-09-27 Superabrasive composition and superabrasive article comprising same for grinding CRT front panel Abandoned US20030114085A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020000056720A KR20020024892A (ko) 2000-09-27 2000-09-27 브라운관 패널 페이스면 연마를 위한 초연마재 지석과초연마재 지석을 이용한 초연마재 공구 및 그 제조방법
KR2000-56720 2001-09-27

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US20030114085A1 true US20030114085A1 (en) 2003-06-19

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US (1) US20030114085A1 (de)
JP (1) JP2002178265A (de)
KR (1) KR20020024892A (de)
CN (1) CN1346863A (de)
DE (1) DE10147707A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080148648A1 (en) * 2005-04-14 2008-06-26 Ehwa Diamond Industrial Co., Ltd. Cutting Segment, Method For Manufacturing Cutting Segment, and Cutting Tool Comprising the Same
US20080202488A1 (en) * 2005-04-21 2008-08-28 Ehwa Diamond Industrial Co., Ltd. Cutting Segment for Cutting Tool and Cutting Tools
US9168637B2 (en) 2012-01-18 2015-10-27 Noritake Co., Limited Vitrified super-abrasive-grain grindstone
US9266220B2 (en) 2011-12-30 2016-02-23 Saint-Gobain Abrasives, Inc. Abrasive articles and method of forming same
US10875152B2 (en) 2016-03-24 2020-12-29 A.L.M.T. Corp. Super-abrasive grinding wheel
US11123841B2 (en) 2016-05-27 2021-09-21 A.L.M.T. Corp. Super-abrasive grinding wheel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030104763A1 (en) * 2001-11-19 2003-06-05 Einset Erik O. Tough and weak crystal mixing for low power grinding
JP5603591B2 (ja) * 2009-11-27 2014-10-08 株式会社アドマテックス 加工用砥粒、加工具、加工液およびそれらを用いた加工方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694267U (de) * 1979-12-19 1981-07-27
KR890006717Y1 (ko) * 1986-05-23 1989-09-30 이상규 특수 유리 연마용 철입 가넷트 팻트
JPH06262527A (ja) * 1993-03-11 1994-09-20 Mitsubishi Materials Corp 砥 石
JPH0775971A (ja) * 1993-09-07 1995-03-20 Nachi Fujikoshi Corp 網入りガラス研削用超砥粒ホイール
DE19513098C2 (de) * 1995-04-07 1997-05-22 Freudenberg Carl Fa Dichtungsanordnung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080148648A1 (en) * 2005-04-14 2008-06-26 Ehwa Diamond Industrial Co., Ltd. Cutting Segment, Method For Manufacturing Cutting Segment, and Cutting Tool Comprising the Same
US8002858B2 (en) 2005-04-14 2011-08-23 Ehwa Diamond Industrial Co., Ltd. Cutting segment, method for manufacturing cutting segment, and cutting tool comprising the same
US20080202488A1 (en) * 2005-04-21 2008-08-28 Ehwa Diamond Industrial Co., Ltd. Cutting Segment for Cutting Tool and Cutting Tools
US7954483B2 (en) * 2005-04-21 2011-06-07 Ehwa Diamond Industrial Co., Ltd. Cutting segment for cutting tool and cutting tools
US9266220B2 (en) 2011-12-30 2016-02-23 Saint-Gobain Abrasives, Inc. Abrasive articles and method of forming same
US9168637B2 (en) 2012-01-18 2015-10-27 Noritake Co., Limited Vitrified super-abrasive-grain grindstone
US10875152B2 (en) 2016-03-24 2020-12-29 A.L.M.T. Corp. Super-abrasive grinding wheel
US11123841B2 (en) 2016-05-27 2021-09-21 A.L.M.T. Corp. Super-abrasive grinding wheel

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JP2002178265A (ja) 2002-06-25
DE10147707A1 (de) 2002-09-05
CN1346863A (zh) 2002-05-01
KR20020024892A (ko) 2002-04-03

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