[go: up one dir, main page]

EP0358615A1 - Diamant-Sägeblatt - Google Patents

Diamant-Sägeblatt Download PDF

Info

Publication number
EP0358615A1
EP0358615A1 EP89850179A EP89850179A EP0358615A1 EP 0358615 A1 EP0358615 A1 EP 0358615A1 EP 89850179 A EP89850179 A EP 89850179A EP 89850179 A EP89850179 A EP 89850179A EP 0358615 A1 EP0358615 A1 EP 0358615A1
Authority
EP
European Patent Office
Prior art keywords
segments
core
wear
diamond
blade
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.)
Withdrawn
Application number
EP89850179A
Other languages
English (en)
French (fr)
Inventor
E.J. Cruickshank
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.)
Cimline Inc
Original Assignee
Cimline Inc
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 Cimline Inc filed Critical Cimline Inc
Publication of EP0358615A1 publication Critical patent/EP0358615A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
    • E01C23/0906—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges
    • E01C23/0926—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges with power-driven tools, e.g. vibrated, percussive cutters
    • E01C23/0933—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges with power-driven tools, e.g. vibrated, percussive cutters rotary, e.g. circular-saw joint cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/025—Details of saw blade body
    • 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

Definitions

  • This invention relates to diamond abrasive saw blades for enlarging cracks or joints in asphalt or concrete surfaces.
  • the repair of cracks and joints includes widening and then filling with some type of sealer or other filler.
  • the widening of the cracks and joints is commonly done by cutting them to a uniform width and depth with a saw blade.
  • the basic method of producing the diamond-­impregnated segments is through hot or cold molding. Segments are molded straight or to conform to the radius of the disc. A combination of soft and hard materials is used to hold the diamond pieces and to alter any "break-in" period for new segments.
  • U.S. Patent No. 3,443,343 describes several production methods. A constraint in the manufacture of diamond-impregnated segments is that diamond distribution and density of the powder metals used can be controlled only if the depth and width of the segments do not exceed certain dimensions, typically .500 for width. Hence, although segment length may be variable, other dimensions are limited.
  • the most common method of attaching diamond segments to a core is to attach arcuately formed segments flush to the outer radius of the core disc with silver solder.
  • the blades must be used with substantial cooling fluid because friction-caused heat can melt the silver solder and cause a premature failure of the blade.
  • the most common cooling fluid is water, and systems range from self-contained units to those requiring large quantities of water supplied by water trucks. Various systems are described in U.S. Patent No. 4,676,557 and seem to be characterized by being bulky and/or expensive.
  • a significant disadvantage of needing a great amount of cooling in the form of fluids is that the cracks must be allowed to dry for up to several days and then cleaned before being sealed.
  • Wear on the core is a problem that has also been approached.
  • the wear is caused by debris formed during cutting acting as an abrasive on the disc.
  • the disc's thickness is reduced until it eventually fails due to mechanical loads produced during cutting.
  • the segments formed on a wrought iron base allow for variations in the thickness of the metal base to control wear on the disc.
  • An irregular shape is produced as the wrought iron base wears disrupting the flow of debris and limiting its abrasive effect. See U.S. Patent No. 3,590,535 for a full explanation of the process.
  • the present invention addresses the problems inherent in this type of blade in a new way.
  • the present blade is comprised of a core of metal or other suitable material formed with a plurality of transversely oriented segments fastened in wear surfaces and separated by heat-relief notches around the periphery of the core. More particularly, each of the wear surfaces includes a radial slot to mechanically attach the transverse oriented, diamond-impregnated segments.
  • a key advantage of the transverse orientation of the diamond segments is that the segments are wider (can be as wide as prior art segments are long), and a wider kerf can be cut. The wider kerf generally serves as a better preparation for repair of joints and cracks, especially where the cracks are jagged and/or non-­uniform in width.
  • the segments can be oriented to produce a wider kerf because they are set into slots in the core in addition to being soldered. Since the diamond segments are set into slots, the amount of segment protruding from the periphery of the core is limited to a small amount for break in only. During operation, the core is allowed to wear at the wear surfaces at the same rate as the diamond segment. Such wear produces much heat and one would think substantial cooling would be needed. The need for substantial cooling, however, is avoided by including heat relief notches between consecutive surfaces.
  • Another advantage of the paddle-like orientation of the diamond-impregnated segments is that it results in a dispersal of the debris created by the cutting; the dispersal being over a wider area generally towards the center of the core.
  • the debris dispersal reduces the abrasive effect on the disc thereby postponing mechanical failure and extending the useful like of the blade.
  • One embodiment of the present blade includes the wear surfaces with diamond-impregnated segments and the heat relief notches spaced uniformly around the periphery of the core.
  • An alternate embodiment is similar but includes angular sections of the core removed resulting in fewer cutting surfaces which allows for greater maneuverability.
  • This embodiment has the advantage of allowing for greater heat dissipation and may also be useful where large amounts of debris are produced during cutting.
  • the core 12 is formed with a circular periphery of the desired diameter.
  • the usual core material is a mild steel such as 1020 or 1040.
  • the arcuate diamond-impregnated cutting segments 14 are attached flush on the periphery of the core 12 at even intervals.
  • the segments 14 are attached with silver solder 16 because the heat generated by other methods would warp the core 12.
  • the debris formed from cutting flows under the segments 14 and causes the core 12 to wear away at position 18 (see Figure 2) because of its abrasive nature. If used long enough, the wear at position 18 causes the core 12 to fail.
  • FIG. 3 A non-prior art, experimental prototype blade 20 with a variation of the assembly in Figure 1 is shown in Figure 3.
  • the arcuate diamond-impregnated cutting segments 24 are mounted in limited depth recesses formed in the periphery of the core 22. The recesses aid in preventing segment loosening, but still limit segment width. Although segments 24 are attached more securely than the flush-mounting shown in Figure 1, the wear pattern is not substantially changed as shown in Figure 4.
  • the core 22 eventually fails at position 28 when the debris abrades enough of the core 22 to cause mechanical failure.
  • the core 32 is formed with a circular periphery of the desired diameter out of a mild carbon steel such as 1020 or 1040 or other suitable material.
  • the diamond-­impregnated cutting segments 34 are set in preferably equidistantly spaced radial slots milled or otherwise formed in the core 32.
  • the segments 34 are set into the core 32 a length of B from the periphery and extend beyond the periphery a length of A. Both lengths can vary depending on the exact construction of the blade 30. After being set into the slots the segments 34 are silver soldered 42 in place.
  • the size of the segments 34 can vary within certain parameters as needed by the particular application.
  • the longitudinal length X is less than the radial length Y. This difference in length controls abrasive wear on the core 32 at position 46 by channeling the debris over a larger area.
  • the change can best be seen by comparing Figure 6 to Figures 2 and 4, and more particularly position 46 with positions 18 and 28 in Figures 2 and 4. The net result is that the useful life of the blade is increased.
  • the width w (which would be the circumferential length in the blades of Figures 1-2) of the segments is shown in Figure 6.
  • the radial slots formed in the core 22 and the silver solder 42 combine to attach the segments 34 securely enough to allow the width w to be greater in blade 30 than in the more common blade 10 (see Figure 1).
  • the additional width w cuts a wider kerf thereby allowing better joint and crack preparation. It also creates a paddlewheel-type action of the blade with the segments 34 acting as paddles to help remove debris from the kerf.
  • Wear surfaces 36, 38 are located at the periphery of the core 32.
  • the blade 30 is designed so that as the cutting segments 34 wear, so do the wear surfaces 36, 38 thereby retaining blade lifetime overall cutting effectiveness as diameter D decreases.
  • the core 32 also has heat relief notches 40, 44 formed around the periphery.
  • the angle measured from a radial line can vary depending on the material being cut and the dimensions of the diamond cutting segments 34.
  • the depth of the heat relief notches 40, 44 as measured along a radial line is C and, in general, should be larger than the set in depth B of the diamond cutting segments 34. That will ensure that as the wear surfaces 36, 38 and the diamond cutting segments 34 wear with use, the heat relief notches 40, 44 remain effective because their minimum depth is (C-B).
  • the heat relief notches 40, 44 are a significant advantage in that by controlling heat build-­up in the core 32 and segments 34, the blade 30 can be used without cooling fluids and accompanying delivery systems.
  • FIG. 7 An alternate embodiment blade is depicted in Figure 7.
  • the blade 70 is essentially the same as the embodiment depicted in Figure 5 with annular sections of the core 72 removed.
  • the remaining outer sections of the core 72 contain the wear surfaces 74, 78; diamond-­impregnated cutting segments 76; and heat relief notches 80.
  • Three removed angular sections and groups of remaining cutting segments 76 are preferably both evenly spaced. The exact configuration of removed angular sections, and remaining groups of cutting segments 76 can vary according to the material being cut.
  • the advantages of the alternate embodiment include a decrease in heat produced during use, greater turning maneuverability for following irregular cracks, and an increase in the ability to cut materials which produce large amounts of debris.
  • the decreased heat production diminishes the possibility that the core 72 will warp or that the diamond cutting segments 76 will loosen due to melting of the silver solder 82.
  • the increased ability to remove debris from the kerf also decreases abrasive wear on the core 72 as discussed for position 46 on Figures 5 and 6. Both the decreased heat production and increased debris-handling ability translates into the elimination of the need for cooling fluid and a longer useful life for the blade 20 in materials where cooling fluid would otherwise be required.
  • Blade 90 is essentially the same as the embodiment depicted in Figure 5, except the heat relief notches 92 have a more advantageous shape.
  • Each notch 92 is formed to have an arcuate bottom 94 which is spaced a distance from the wear portion 96 of core 98, a distance which is at least as great as the depth of diamond-impregnated segment 100, and preferably equal to about twice the depth of a segment 100.
  • each notch 92 may be parallel to one another, it is not necessary and it is actually preferable that sides 102 be inclined slightly toward one another so that extending portion 104 of core 98 is not unnecessarily weakened by creating a neck in a region between successive notches inwardly from a diamond-impregnated segment 100.
  • Blade 90 with notches 92 is particularly advantageous since it has no sharp corners along the interior surfaces of the notches, thereby alleviating a tendency of fracturing near such corners.
  • the width of notches 92 at the preferable depth allows for more efficient cuttings removal, even when diamond-­impregnated segments 100 are near the end of their wear life.
  • the substantial width of the notches even at a depth beneath the bottom or inwardly most side of diamond-impregnated segments 100 results in greater cooling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP89850179A 1988-09-06 1989-05-31 Diamant-Sägeblatt Withdrawn EP0358615A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24103688A 1988-09-06 1988-09-06
US241036 1988-09-06

Publications (1)

Publication Number Publication Date
EP0358615A1 true EP0358615A1 (de) 1990-03-14

Family

ID=22908980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89850179A Withdrawn EP0358615A1 (de) 1988-09-06 1989-05-31 Diamant-Sägeblatt

Country Status (1)

Country Link
EP (1) EP0358615A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172168A1 (de) * 2000-07-11 2002-01-16 Veisto-Rakenne Rautio Oy Kreissägeblatt mit einer radialen Verdickung um Eindringen des Sägestaubes im Raum zwischen Sägeblattkörper und Werkstück zu verhinderen
EP1612018A1 (de) * 2004-06-30 2006-01-04 HILTI Aktiengesellschaft Werkzeug zur Bearbeitung eines mineralischen Untergrundes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE172082C (de) *
DE174441C (de) *
FR1403863A (fr) * 1964-05-15 1965-06-25 Arc Procédé d'avoyage des scies circulaires à plaquettes rapportées
US3517463A (en) * 1968-03-06 1970-06-30 Super Cut Rotary segmental saw with drycutting characteristics

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE172082C (de) *
DE174441C (de) *
FR1403863A (fr) * 1964-05-15 1965-06-25 Arc Procédé d'avoyage des scies circulaires à plaquettes rapportées
US3517463A (en) * 1968-03-06 1970-06-30 Super Cut Rotary segmental saw with drycutting characteristics

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED,sections P,Q, week E 38, November 3, 1982 DERWENT PUBLICATIONS LTD., London, P 64 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172168A1 (de) * 2000-07-11 2002-01-16 Veisto-Rakenne Rautio Oy Kreissägeblatt mit einer radialen Verdickung um Eindringen des Sägestaubes im Raum zwischen Sägeblattkörper und Werkstück zu verhinderen
EP1612018A1 (de) * 2004-06-30 2006-01-04 HILTI Aktiengesellschaft Werkzeug zur Bearbeitung eines mineralischen Untergrundes

Similar Documents

Publication Publication Date Title
CA1319825C (en) Wear resistant abrasive cutting wheel
US5115796A (en) Diamond abrasive saw blade and method of dry sawing concrete
US4962748A (en) Diamond abrasive saw blade and method of dry sawing concrete
US3049843A (en) Abrasive cutting devices
US3162187A (en) Diamond saw blades
US6033295A (en) Segmented cutting tools
US6845767B2 (en) Segmented diamond blade with undercut protection
KR100263787B1 (ko) 개량된 초 연삭재 도구
KR100329309B1 (ko) 연마절삭공구및연마절삭방법
US3128755A (en) Undercut resistant diamond abrasive saw blade
US4337750A (en) Abrasion resistant diamond blade
EP0572655A1 (de) Bohrmeissel mit verbessertem schneideinsatzmuster.
US4930487A (en) Cement cutting blade
US3127887A (en) Diamond saw blade assembly for routing and regrooving concrete joints
US4462382A (en) Circular saw for cutting green concrete and asphalt
US4550708A (en) Abrasive cutting wheel for cutting rock-like material
EP0233921A1 (de) Körperbau einer schleifscheibe
US7600543B2 (en) Stump grinding disk and wear strips therefor
CA2197796A1 (en) Electrodeposited diamond wheel
US6321738B1 (en) Diamond saw blade
US6058923A (en) Saw blade
EP0358615A1 (de) Diamant-Sägeblatt
AU695116B2 (en) Abrasive cutting tool
US4583515A (en) Abrasive cutting wheel for cutting rock-like material
US3599622A (en) Circular saw construction

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19900816

17Q First examination report despatched

Effective date: 19910507

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19911119