EP1937440B1 - Abrasive cutting disc and abrasive cutting element hereto - Google Patents

Abrasive cutting disc and abrasive cutting element hereto Download PDF

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Publication number
EP1937440B1
EP1937440B1 EP06809031A EP06809031A EP1937440B1 EP 1937440 B1 EP1937440 B1 EP 1937440B1 EP 06809031 A EP06809031 A EP 06809031A EP 06809031 A EP06809031 A EP 06809031A EP 1937440 B1 EP1937440 B1 EP 1937440B1
Authority
EP
European Patent Office
Prior art keywords
abrasive
abrasive segments
segments
nubs
sintered
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.)
Not-in-force
Application number
EP06809031A
Other languages
German (de)
French (fr)
Other versions
EP1937440A1 (en
Inventor
Paul Christian BÖGLE
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.)
Heger GmbH European Diamond Tools
Original Assignee
Heger GmbH European Diamond Tools
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 Heger GmbH European Diamond Tools filed Critical Heger GmbH European Diamond Tools
Publication of EP1937440A1 publication Critical patent/EP1937440A1/en
Application granted granted Critical
Publication of EP1937440B1 publication Critical patent/EP1937440B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B28D1/121—Circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B24D5/123—Cut-off wheels having different cutting segments

Definitions

  • the present invention relates to an abrasive cutoff wheel and abrasive segments for abrasive cutoff wheels.
  • Abrasive cutoff wheels of this kind are known for instance from the German patent documents DE C2 44 24 093 and DE A1 199 08 037 .
  • An abrasive cut off wheel according to the preamble of claim 1 is known from WO02/066217 A .
  • the present invention offers the following advantages: Very quiet operation when cutting; higher cutting speeds by reducing the cutting surface at the cutting element; improved water feed when wet-cutting because of the abrasive segments' nubby structures; imparting a precutting effect to the cut edge of the workpiece sectioned by the abrasive cutting wheel.
  • Abrasive cutting wheels of the present invention are especially well suited to cut stone, in particular hard natural stone such as granite, masonry and concrete for instance of buildings, bridges and roads, for instance concrete walls, tile walls, concrete or tile ceilings, bridge components and road coverings made of concrete and of similarly hard materials.
  • hard natural stone such as granite, masonry and concrete
  • bridges and roads for instance concrete walls, tile walls, concrete or tile ceilings, bridge components and road coverings made of concrete and of similarly hard materials.
  • the abrasive cutting wheel shown in Fig. 1 comprises a central disk 2 having a central aperture 4 to affix it to a rotary shaft and a plurality of sintered abrasive segments 6 undetachably affixed to the outer circumference 8 of the central disk 2.
  • the abrasive segments 6 project bilaterally by their sides 10 and 12 beyond the central disk 2.
  • the sides 10 and 12 of the abrasive segments 6 are farther apart from each other than are the large sides 14 and 16 of the central disk 2. Therefore the central disk 2 is thinner than the abrasive segments 6.
  • the central disk 2 is thinner at least at its rim than the abrasive segments 6.
  • the nubs 20 are mutually offset in the direction of cutting (circumferential disk direction) and in the direction of the height of the abrasive segments 6 (radial cutoff wheel direction) from one another on both the sides 10 and 12 of the abrasive segment 6 in a manner that, as seen in the direction of abrasion, they seem to be at least mutually adjoining or mutually overlapping. This feature is shown in particular in Figs. 1 and 2 .
  • the abrasive segments 6 each comprise a narrow front side 22 and a narrow rear side 24. Furthermore, each abrasive segment 6 comprises a narrow external surface 26 pointing away from the outer circumference 8 of the central disk 2 and a narrow inner surface 28 pointing toward the outer circumference 8 of the central disk 2. Each abrasive segment 6 is undetachably affixed at its narrow inner surface 28 to an external circumferential sector 30 of the outer circumference 8 of the central disk 2, for instance by soldering, welding, bonding or laser processing (laser beam welding).
  • the outer circumference 8 of the central disk 2 may be continuous (uninterrupted) or it may comprises circumferential notches 32. In the latter case the outer circumference of the central disk 2 is divided into affixation stubs 34 of which the narrow radially outer surfaces each constitute one of said external circumferential sectors 30 shown in Fig. 1 .
  • the abrasive segments 6 are made of a sintered block of which the nubs 20 project from the segment sides 10 and 12, said nubs having been integrally molded and sintered with the abrasive segments.
  • the abrasive segments together with their nubs 20 can be manufactured by sintering a mixture of powders containing the particles required for grinding, in particular diamond particles and preferably also metal powder(s). Following sintering, the abrasive segments 6 are undetachably affixed to the circumference 8 (30) of the central disk 2.
  • the nubs 20 preferably are cross-sectionally circular as shown in the sideviews of Figs. 1 and 2 . However, other cross-sectional shapes may also be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

An abrasive cutoff wheel comprising a central disk (2) and a plurality of sintered abrasive segments (6) that are undetachably affixed to the outer circumference (8, 30) of the central disk (2) and that bilaterally protrude beyond the central disk (2) wherein the sintered abrasive segments (6) are fitted with a plurality of nubs (20) which project from the sides of the abrasive segments (6) and which are integrally molded and sintered with the abrasive segments (6) .

Description

    BACKGROUND
  • The present invention relates to an abrasive cutoff wheel and abrasive segments for abrasive cutoff wheels.
  • Abrasive cutoff wheels of this kind are known for instance from the German patent documents DE C2 44 24 093 and DE A1 199 08 037 . An abrasive cut off wheel according to the preamble of claim 1 is known from WO02/066217 A .
    • SUMMARY
  • Illustratively the present invention offers the following advantages: Very quiet operation when cutting; higher cutting speeds by reducing the cutting surface at the cutting element; improved water feed when wet-cutting because of the abrasive segments' nubby structures; imparting a precutting effect to the cut edge of the workpiece sectioned by the abrasive cutting wheel.
  • Abrasive cutting wheels of the present invention are especially well suited to cut stone, in particular hard natural stone such as granite, masonry and concrete for instance of buildings, bridges and roads, for instance concrete walls, tile walls, concrete or tile ceilings, bridge components and road coverings made of concrete and of similarly hard materials.
    • BRIEF DESCRIPTION OF DRAWINGS
  • The present invention is elucidated below by means of an illustrative and preferred embodiment mode and in relation to the appended drawings.
    • Fig. 1 is a sideview of an abrasive cutoff wheel in accordance with an embodiment of the invention,
    • Fig. 2 is an enlarged sideview of an abrasive segment of the abrasive cutoff wheel of Fig. 1,
    • Fig. 3 is a cross-section along the plane III-III of Fig. 2,
    • Fig. 4 is an enlarged cutaway from Fig. 3, and
    • Fig. 5 is a cross-section of an abrasive segment such as shown in Fig. 2 affixed to a cross-sectional portion of a. central disk of the abrasive cutoff wheel of Fig. 1.
    DETAILED DESCRIPTION OF EMBODIMENTS
  • The abrasive cutting wheel shown in Fig. 1 comprises a central disk 2 having a central aperture 4 to affix it to a rotary shaft and a plurality of sintered abrasive segments 6 undetachably affixed to the outer circumference 8 of the central disk 2. As shown in Fig. 5, the abrasive segments 6 project bilaterally by their sides 10 and 12 beyond the central disk 2. The sides 10 and 12 of the abrasive segments 6 are farther apart from each other than are the large sides 14 and 16 of the central disk 2. Therefore the central disk 2 is thinner than the abrasive segments 6. The central disk 2 is thinner at least at its rim than the abrasive segments 6.
  • The nubs 20 are mutually offset in the direction of cutting (circumferential disk direction) and in the direction of the height of the abrasive segments 6 (radial cutoff wheel direction) from one another on both the sides 10 and 12 of the abrasive segment 6 in a manner that, as seen in the direction of abrasion, they seem to be at least mutually adjoining or mutually overlapping. This feature is shown in particular in Figs. 1 and 2.
  • Referred to the direction of rotation 24 of the abrasive cutoff wheel, the abrasive segments 6 each comprise a narrow front side 22 and a narrow rear side 24. Furthermore, each abrasive segment 6 comprises a narrow external surface 26 pointing away from the outer circumference 8 of the central disk 2 and a narrow inner surface 28 pointing toward the outer circumference 8 of the central disk 2. Each abrasive segment 6 is undetachably affixed at its narrow inner surface 28 to an external circumferential sector 30 of the outer circumference 8 of the central disk 2, for instance by soldering, welding, bonding or laser processing (laser beam welding).
  • The outer circumference 8 of the central disk 2 may be continuous (uninterrupted) or it may comprises circumferential notches 32. In the latter case the outer circumference of the central disk 2 is divided into affixation stubs 34 of which the narrow radially outer surfaces each constitute one of said external circumferential sectors 30 shown in Fig. 1.
  • The abrasive segments 6 are made of a sintered block of which the nubs 20 project from the segment sides 10 and 12, said nubs having been integrally molded and sintered with the abrasive segments. The abrasive segments together with their nubs 20 can be manufactured by sintering a mixture of powders containing the particles required for grinding, in particular diamond particles and preferably also metal powder(s). Following sintering, the abrasive segments 6 are undetachably affixed to the circumference 8 (30) of the central disk 2.
  • The nubs 20 preferably are cross-sectionally circular as shown in the sideviews of Figs. 1 and 2. However, other cross-sectional shapes may also be used.

Claims (7)

  1. An abrasive cutoff wheel comprising a central disk (2) and a plurality of sintered abrasive segments (6) that are undetachably affixed to the outer circumference (8; 30) of the central disk (2) and that bilaterally protrude beyond the central disk (2) wherein the sintered abrasive segments (6) are fitted with a plurality of nubs (20) which are mutually offset in the direction of cutting i.e. circumferential disk direction and in the direction of height of the abrasive segments i.e. radial cutoff wheel direction from one another on both sides (10, 12) of the abrasive segments (6) in a manner that, as seen in the direction of abrasion, they seem to be at least mutually adjoining or mutually overlapping,
    characterized in that
    the nubs (20) project from the sides (10, 12) of the abrasive segments (6), the nubs (20) and the abrasive segments (6) consist of the same material and that the nubs are integrally molded and sintered with the abrasive segments (6).
  2. Abrasive cutoff wheel as claimed in claim 1 , wherein the outer circumference (8) of the central disk (2) is divided by a plurality of circumferential notches (32) into a plurality of affixation stubs (34) and the abrasive segments (6) each are affixed to one of said affixation stubs (34).
  3. Abrasive cutoff wheel as claimed in one of the above claims, wherein the abrasive segments (6) contain diamond particles sintered into them.
  4. Abrasive cutoff wheel as claimed in one of the above claims, wherein the abrasive segments (6) contain metal particles sintered into them.
  5. Abrasive segments (6) for abrasive cutoff wheels, said segments comprising faces (10, 12) projecting bilaterally beyond the outer circumference of a central disk of said cutoff wheel after they have been affixed to said disk, the abrasive segments each being in the form of a sintered block, wherein the abrasive segments (6) each are fitted with a plurality of nubs (20) which and are mutually offset in the direction of cutting i.e. circumferential disk direction and in the direction of height of the abrasive segments i.e. radial cutoff wheel direction from one another on both sides (10, 12) of the abrasive segments (6) in a manner that, as seen in the direction of abrasion, they seem to be at least mutually adjoining or mutually overlapping,
    characterized in that the nubs (20) project from the faces (10, 12), the nubs (20) and the abrasive segments (6) consist of the same material and that the nubs are integrally molded and sintered with the abrasive segments (6).
  6. Abrasive segments as claimed in claim 5, containing diamond particles.
  7. Abrasive segments as claimed in either of claims 5 and 6, containing metal powder.
EP06809031A 2005-10-19 2006-10-16 Abrasive cutting disc and abrasive cutting element hereto Not-in-force EP1937440B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200520016385 DE202005016385U1 (en) 2005-10-19 2005-10-19 Cut-off wheel and grinding segment for this
PCT/IB2006/002882 WO2007045960A1 (en) 2005-10-19 2006-10-16 Abrasive cutting disc and abrasive cutting element hereto

Publications (2)

Publication Number Publication Date
EP1937440A1 EP1937440A1 (en) 2008-07-02
EP1937440B1 true EP1937440B1 (en) 2011-03-16

Family

ID=35669041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06809031A Not-in-force EP1937440B1 (en) 2005-10-19 2006-10-16 Abrasive cutting disc and abrasive cutting element hereto

Country Status (3)

Country Link
EP (1) EP1937440B1 (en)
DE (2) DE202005016385U1 (en)
WO (1) WO2007045960A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022029144A1 (en) * 2020-08-04 2022-02-10 Husqvarna Ab Cutting segment for a saw blade
USD994737S1 (en) 2020-08-28 2023-08-08 Husqvarna Ab Cutting blade
USD995585S1 (en) 2020-08-28 2023-08-15 Husqvarna Ab Cutting blade
USD999265S1 (en) 2020-08-28 2023-09-19 Husqvarna Ab Cutting blade

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB580867A (en) * 1944-04-08 1946-09-23 Impregnated Diamond Prod Ltd Improvements in or relating to circular saws for cutting stone and the like
US3440773A (en) * 1966-08-26 1969-04-29 Norton Co Abrasive cutting device
DE2238387A1 (en) * 1972-08-04 1974-03-28 Winter & Sohn Ernst MULTI-BLADE CUTTING TOOL
JPS61142076A (en) * 1985-01-21 1986-06-28 Niro Inoue Segment type diamond saw
US5791330A (en) * 1991-06-10 1998-08-11 Ultimate Abrasive Systems, L.L.C. Abrasive cutting tool
DE4243017A1 (en) * 1992-12-18 1994-06-23 Hilti Ag Disc-shaped grinding tool
KR100414006B1 (en) * 2001-02-20 2004-01-07 이화다이아몬드공업 주식회사 A Machining Tip And Cutting Wheel, Grinding Wheel, Drilling Wheel Therewith
JP2004322231A (en) * 2003-04-22 2004-11-18 Read Co Ltd Grinding wheel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022029144A1 (en) * 2020-08-04 2022-02-10 Husqvarna Ab Cutting segment for a saw blade
USD994737S1 (en) 2020-08-28 2023-08-08 Husqvarna Ab Cutting blade
USD995585S1 (en) 2020-08-28 2023-08-15 Husqvarna Ab Cutting blade
USD999265S1 (en) 2020-08-28 2023-09-19 Husqvarna Ab Cutting blade

Also Published As

Publication number Publication date
WO2007045960A1 (en) 2007-04-26
EP1937440A1 (en) 2008-07-02
DE602006020751D1 (en) 2011-04-28
DE202005016385U1 (en) 2006-01-12

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