EP0479973A4 - Cavitied abrading device with layered grit - Google Patents
Cavitied abrading device with layered gritInfo
- Publication number
- EP0479973A4 EP0479973A4 EP19910907212 EP91907212A EP0479973A4 EP 0479973 A4 EP0479973 A4 EP 0479973A4 EP 19910907212 EP19910907212 EP 19910907212 EP 91907212 A EP91907212 A EP 91907212A EP 0479973 A4 EP0479973 A4 EP 0479973A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- grit
- metal
- cavities
- abrasive tool
- wheel
- 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
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
Definitions
- This invention relates generally to an abrasive wheel for use in abrading various types of materials . More particularly, the invention utilizes crushed, sintered re ⁇ fractory metal grits such as sintered tungsten carbides and like hard particle substances which can be braze metal joined (or joined by other means) to a supporting base mem ⁇ ber.
- the present invention is directed to an abrasive wheel for use in the abrading of various materials .
- This tool maintains all the advantages of the prior art devices, while providing enhanced performance and a longer useful life.
- One object, therefore, of the present invention is to provide a generally uniform and layered distribution of small metal grit over the smooth land area of the abrasive wheel which will allow the cutting surface of the abrasive wheel to achieve a longer useful life.
- a second object of the present invention is to allow for a more aggressive cutting action of the wheel by provid ⁇ ing for improved removal of abraded material from the cut ⁇ ting surface of the wheel.
- a third object of the present invention is to impart an enhanced cutting ability to a wheel while employing a smaller abrasive particle size, resulting in a finer texture left on the work piece.
- a fourth object of the present invention is to pro ⁇ vide a cutting tool which runs cooler and more efficiently than prior art devices through improved heat distribution from contact to non-contact surfaces, as well as a lowered torque due to a shortened extension of the grit particles from the metal surface.
- a fifth object of the present invention is to pro ⁇ vide a cutting tool which is more economical to manufacture.
- Figure 1 is a side view of one type of abrasive wheel, commonly referred to as a "contour wheel", showing the metal base member, and the supporting base member with the sintered metal grit distributed generally uniformly along the surface.
- Figure 2 is a close-up view of the surface of the supporting base member, showing the sintered metal grit on the lands, as well as the concavities void of metal grit.
- Figure 3 is a cross sectional view of the supporting base member and grit protrusions.
- Figure 1 the finished tool, with metal base member 1, handle 2, and sup ⁇ porting base member 3, is shown in Figure 1.
- the abrasive wheel illustrated in Figure 1 known in the trade as a "contour wheel”
- a variety of wheel shapes e.g., conical or cylindrical, can be employed.
- FIG 2 the generally uniform distribution of metal grit 4 over the smooth portion of "lands" area 5 of supporting base member 3 is illustrated. Note that no grit occupies the cavities 6 on base member 3.
- Figure 3 illustrates the disposition of the magnetized, metal grit 4. The grit is not confined to extending radial ⁇ ly outward from a center point, but rather forms interconnected layers of vertically and horizontally posi- tioned grit. When a small grit particle breaks away, this layered effect enables another grit particle to be exposed.
- the present invention teaches the use of cavities or recesses distributed either uniformly or non-uniformly along the supporting base member 3; the periphery of these cavities faces the metal base member 1.
- These cavities may be of any convenient shape, e.g., round, square, etc.
- the spacing of the cavities can be varied to conform with the desired action of the wheel and the size of the abrasive material to be applied.
- the cavities may be spaced in straight rows or staggered in any number of design combinations. It can be appreciated by those skilled in the art that the size and spacing of the cavities can be changed to achieve an abrasive wheel with a wide operating range.
- the cavities provide an important structural advantage which further enhances the cutting ability of the wheel.
- the material removed by the wheel has the free area in the cavi ⁇ ties to retreat to. At the point of contact with the wheel, portions of the abraded material are displaced within the individual cavities. As the high speed abrasive wheel rotates, the abraded material is expelled from the cavities by centrifugal force. In contrast, removed material in prior art devices tended to become trapped and load up on the abrasive protrusions, reducing the wheel's cutting abil ⁇ ity. Further, some conventional wheels had holes on their outer workiag surface.
- Such configurations not only physi ⁇ cally reduce the strength of the wheel, but also allow the abraded material to pass through the holes and build up on the inner surface of the wheel, causing the holes to close. Further, it has been found that a magnetic field applied to a wheel with holes causes the grit to lie flat and ineffec ⁇ tual upon the metal surface.
- the cavities of the present invention allow for a more aggressive cutting action of the wheel by ameliorating the effect of abraded material build ⁇ up.
- metal grit is generally uniformly distributed over the land area of the supporting base member, but not on the inner surface of the cavities.
- the prior art taught the formation of bunched grit on the outermost periphery of the protuberances, and not on the lands area between the protuberances. This is due to the fact that the metal grit, as a result of magnetic flux lines which naturally concentrate in areas of discontinuity, is forced to points on the external metal surface that exhibit rapid contour changes.
- smaller metal grit can be utilized than that of the prior art, as the grit of the present invention need not be selected such that its length exceeds its smallest cross section.
- These smaller size par ⁇ ticles impart an enhanced cutting ability to the wheel, as the resulting decreased cutting clearance makes the wheel easier to control, and leaves a finer texture on the work piece.
- the longer particles of the prior art are more subject to fracturing and breakage.
- the layered, interconnected grit of the present in ⁇ vention imparts a longer useful life to the abrasive wheel for three reasons.
- First, the layered configuration insures that when one piece of grit breaks away, another grit parti ⁇ cle below it will be exposed for cutting.
- Second, the dimpled effect on the supporting base member allows the tool to run cooler and more efficiently. This is due to the fact that the inner surface of a wheel with recesses encompasses a greater surface area than a smooth surface. This increased surface area provides enhanced heat transfer capa ⁇ bilities to the metal surface, and thus improves heat dissipation as the wheel is used.
- Third, the smaller grit extends a shorter distance from the supporting base member than prior art tools . This shortened distance lowers the torque and thus the force applied to individual grit parti ⁇ cles, which decreases the energy required to do work. More total work is accomplished, however, due to the increased number of smaller grit particles .
- the present invention also allows for more economi ⁇ cal manufacture of these abrading tools . This economy is achieved through the previously described more efficient utilization of smaller abrasive particles than conventional wheels .
- the metal grit consists of sintered tungsten carbides which can be braze metal joined (or joined by other means) to the sup ⁇ porting base member.
- the supporting base member is usually constructed out of a mild steel or other iron base alloy which has a high enough melting temperature beyond that of the brazing metal used to bond the various constituents of the finally processed device. (See U.S. Patent No. 3,918,217, which is hereby incorporated by reference into this application.)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US511393 | 1983-07-06 | ||
US51139390A | 1990-04-18 | 1990-04-18 | |
PCT/US1991/001772 WO1991016175A1 (en) | 1990-04-18 | 1991-03-15 | Cavitied abrading device with layered grit |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0479973A1 EP0479973A1 (en) | 1992-04-15 |
EP0479973A4 true EP0479973A4 (en) | 1992-07-08 |
EP0479973B1 EP0479973B1 (en) | 1995-12-06 |
Family
ID=24034712
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91907212A Expired - Lifetime EP0479973B1 (en) | 1990-04-18 | 1991-03-15 | Cavitied abrading device with layered grit |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0479973B1 (en) |
JP (1) | JP3184519B2 (en) |
AT (1) | ATE131096T1 (en) |
AU (1) | AU647470B2 (en) |
BR (1) | BR9105723A (en) |
CA (1) | CA2058960C (en) |
DE (1) | DE69115214T2 (en) |
DK (1) | DK0479973T3 (en) |
ES (1) | ES2079651T3 (en) |
WO (1) | WO1991016175A1 (en) |
ZA (1) | ZA912669B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5239784A (en) * | 1990-04-18 | 1993-08-31 | B & J Manufacturing Company | Cavitied abrading device with smooth lands area and layered grit |
EP0830237A1 (en) * | 1995-06-07 | 1998-03-25 | Norton Company | Cutting tool having textured cutting surface |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3918217A (en) * | 1972-07-24 | 1975-11-11 | Lloyd R Oliver & Company | Abrading device with protrusions on metal bonded abrasive grits |
DE2758285A1 (en) * | 1977-12-27 | 1979-06-28 | Honda Motor Co Ltd | Grinding wheel mfg. process - has hub blank machined and balanced before applying peripheral abrasive coating |
US4908046A (en) * | 1989-02-14 | 1990-03-13 | Wiand Ronald C | Multilayer abrading tool and process |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4821461A (en) * | 1987-11-23 | 1989-04-18 | Magnetic Peripherals Inc. | Textured lapping plate and process for its manufacture |
-
1991
- 1991-03-15 EP EP91907212A patent/EP0479973B1/en not_active Expired - Lifetime
- 1991-03-15 AT AT91907212T patent/ATE131096T1/en not_active IP Right Cessation
- 1991-03-15 WO PCT/US1991/001772 patent/WO1991016175A1/en active IP Right Grant
- 1991-03-15 BR BR919105723A patent/BR9105723A/en not_active IP Right Cessation
- 1991-03-15 JP JP50641791A patent/JP3184519B2/en not_active Expired - Lifetime
- 1991-03-15 DE DE69115214T patent/DE69115214T2/en not_active Expired - Lifetime
- 1991-03-15 ES ES91907212T patent/ES2079651T3/en not_active Expired - Lifetime
- 1991-03-15 DK DK91907212.4T patent/DK0479973T3/en active
- 1991-03-15 AU AU75489/91A patent/AU647470B2/en not_active Expired
- 1991-03-15 CA CA002058960A patent/CA2058960C/en not_active Expired - Fee Related
- 1991-04-10 ZA ZA912669A patent/ZA912669B/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3918217A (en) * | 1972-07-24 | 1975-11-11 | Lloyd R Oliver & Company | Abrading device with protrusions on metal bonded abrasive grits |
DE2758285A1 (en) * | 1977-12-27 | 1979-06-28 | Honda Motor Co Ltd | Grinding wheel mfg. process - has hub blank machined and balanced before applying peripheral abrasive coating |
US4908046A (en) * | 1989-02-14 | 1990-03-13 | Wiand Ronald C | Multilayer abrading tool and process |
Also Published As
Publication number | Publication date |
---|---|
AU647470B2 (en) | 1994-03-24 |
DE69115214T2 (en) | 1996-06-20 |
ES2079651T3 (en) | 1996-01-16 |
CA2058960C (en) | 1999-11-09 |
EP0479973A1 (en) | 1992-04-15 |
AU7548991A (en) | 1991-11-11 |
DE69115214D1 (en) | 1996-01-18 |
ZA912669B (en) | 1992-01-29 |
ATE131096T1 (en) | 1995-12-15 |
JPH05500778A (en) | 1993-02-18 |
JP3184519B2 (en) | 2001-07-09 |
DK0479973T3 (en) | 1996-03-04 |
CA2058960A1 (en) | 1991-10-19 |
EP0479973B1 (en) | 1995-12-06 |
BR9105723A (en) | 1992-08-04 |
WO1991016175A1 (en) | 1991-10-31 |
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