US20130203326A1 - Grinding wheel for longitudinal or transverse grinding - Google Patents
Grinding wheel for longitudinal or transverse grinding Download PDFInfo
- Publication number
- US20130203326A1 US20130203326A1 US13/759,193 US201313759193A US2013203326A1 US 20130203326 A1 US20130203326 A1 US 20130203326A1 US 201313759193 A US201313759193 A US 201313759193A US 2013203326 A1 US2013203326 A1 US 2013203326A1
- Authority
- US
- United States
- Prior art keywords
- grinding
- grinding wheel
- wheel defined
- core part
- fibers
- 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
Links
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Classifications
-
- 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
- B24D5/02—Wheels in one piece
- B24D5/04—Wheels in one piece with reinforcing means
-
- 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
- B24D3/001—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 supporting member
-
- 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
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
-
- 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
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
- B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic
-
- 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
- B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
- B24D5/08—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with reinforcing means
-
- 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
- B24D5/14—Zonally-graded wheels; Composite wheels comprising different abrasives
Abstract
A grinding wheel has an inner core part and an outer annular grinding part connected the inner core part. The outer grinding part is made of a granular abrasive medium and plastic or glass fibers. The fibers form between 0.15% and 1%, preferably 0.2% to 0.4%, by weight of the grinding part.
Description
- The present invention relates to a grinding disk or wheel. More particularly this invention concerns such a disk or wheel that can grind both longitudinally and transversely.
- A typical grinding wheel for longitudinal and transverse grinding has an inner core part and an outer annular grinding part that are connected to each other. The grinding part is made of a material that contains a granular abrasive compound. EP 1,129,824 discloses a grinding wheel of this kind.
- When processing plate slabs in the manufacture of steel, the surfaces undergo abrasive machining to remove any faulty areas such as voids that may be present. A grinding wheel is used to this end containing particles in the abrasive compound thereof in the grinding part. The selection of the abrasive particles depends on the workpiece being machined. In most cases, abrasive particles should be very hard, with sufficient particle toughness and resistance to heat, as well as suitable particle sizes and shapes. Frequently used abrasive particles are made from carborundum (aluminum oxide), silicon carbide, cubic boron nitride or diamond, which grinding materials have been named in the order of ascending hardness. The shape of the abrasive particles as well as the particle sizes thereof depend on the type of machining, namely, whether so-called rough-grinding, pregrinding, finish-grinding or precision-grinding.
- During the grinding process, the grinding wheel is rotated at relatively high speeds of 80 m/s or more. Considerable centrifugal forces are generated at such grinding speeds requiring high-level security measures. The relatively high susceptibility of the grinding wheels to breakage poses a risk for operators, as it can cause single large pieces of the grinding disk or even entire segments of grinding parts to detach. Despite necessary safety steps, namely by balancing the grinding wheel, sound testing before the start-up of operation, careful mounting of the grinding wheel and enclosing the grinding wheel inside a protective hood, the durability of the grinding wheel is of the utmost importance. In particular, any detachment of individual segments of the grinding part must be effectively avoided.
- It is therefore an object of the present invention to provide an improved grinding wheel.
- Another object is the provision of such an improved grinding wheel that overcomes the above-given disadvantages, in particular that is very rugged and unlikely to come apart even if rotated at very high speeds.
- A grinding wheel has according to the invention an inner core part and an outer annular grinding part connected the inner core part. The outer grinding part is made of a granular abrasive medium and plastic or glass fibers. The fibers form between 0.15% and 1%, preferably 0.2% to 0.4%, by weight of the grinding part.
- Although the use of filler materials, including glass fibers, has been proposed previously for cutting wheels of smaller diameters or even for larger grinding wheels, in these instances, the goal was to minimize cost of the grinding wheel. The centrifugal force of a grinding wheel is calculated from the product of mass, square of the angular velocity and distance from the axis of rotation; this means that especially grinding wheels that have a large mass and a large diameter are subject to enormous centrifugal forces. Correspondingly, the formation of hair-line fractures that triggers the detachment of parts from grinding parts at a later time must be avoided. For this reason, strict adherence to the percentage parts of mass for plastic or glass fibers is required. The risk of breakage increases dramatically above 1.0 mass % of the grinding part. Below 0.3%, any addition of plastic or glass fibers is for the most part without effect at all. Only the restricted quantity of 0.15% to 1.0% in fact results in good adhesive power of the grinding wheel portions without compromising toughness.
- Preferably, glass fibers of a length of 5 mm to 15 mm and a thickness of 0.8 mm to 1.2 mm are used.
- The grinding wheels according to the invention have, for example, a standardized diameter of 615 mm with a thickness of 79 mm and an inner bore hole in the core part with a diameter of 203 mm. The outer diameter of the core part is 340 mm. The weight of such a grinding wheel, including any embedded iron reinforcement rings, is about 63 kg. To avoid any relative movement of the core and grinding parts in the direction of rotation, the substantially cylindrical outer surface of the core part is formed with individual grooves or singular recesses, and the cylindrical inner surface of the grinding part includes complementary individual ridges or singular bumps. The ridges or singular bumps engage in the grooves or singular recesses of the core part, respectively, to produce an effective “keying” between the core part and the grinding part. The corresponding grooves, recesses or bumps can be easily incorporated during cold shaping.
- The present invention provides, in principle, for the use of all common grinding materials, preferably Al2O3, SiC, CBN, ZrO2, diamond or mixtures of these material, the maximum particle diameter being no more than 1 mm.
- As known, in principle, from above-cited EP 1,129,824 T2, the core part and the grinding part have the same thermal coefficients of expansion. If necessary, the coefficients of expansion can deviate by a maximum of 5% from each other. This measure ensures that, when the grinding wheel becomes hot during operation, differential stresses between the core region and the grinding part are for the most part avoided.
- Aside from the abrasive particles, the core and grinding parts can principally be made of the same or different materials. According to a further embodiment of the invention, the grinding part can contain a matrix of metal or a metal alloy or a thermally curable resin in which the granular abrasive medium and the plastic or glass fibers are embedded in a homogenous distribution, at least for the most part homogeneously. The core part can substantially be made of metal and/or metal alloys that have filler materials added thereto, if necessary. In particular, it is possible to use the core part multiple times. Thus after the grinding part is worn out, what is left of the grinding part can be separated from the core part, and a new grinding part can be formed on the core part.
- In particular with regard to at least approximately equal thermal coefficients of expansion, however, the core part (preferably the grinding part as well) can contain a thermally curable resin and a cross-linking agent as well as filler materials. Fillers can be, for example, powdery SiC, Al2O3, bauxite, graphite or molybdenum sulfide.
- To be able to ensure optimum solidity of the grinding wheel, it is preferable to produce the core section first, followed by the cutting portion, by cold shaping. The green compact formed in this manner, which is made of the core and grinding parts, is already provided with grooves and ridges that engage with each other in the manner following a tongue-and-groove principle (or, in the alternative, singular recesses and singular pegs).
- The combined compacted green compact is then heated to 180° C. to 200° C. and compacted to the desired final dimensions. The compression pressures are, for example, 7×107 Pa (700 bar).
- The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
-
FIG. 1 is a top view of a grinding wheel according to the invention; -
FIG. 2 is a side view of the grinding wheel; and -
FIG. 3 is a section taken along line III-III ofFIG. 1 . - As seen in
FIGS. 1 and 2 a grinding wheel according to the invention has aninner core part 10 and anouter grinding part 11, both centered on an axis A. The outer diameter of the grinding part measured diametrally is 615 mm and the axial thickness of the grinding wheel, as seen inFIG. 2 , is 79 mm. Bothparts grinding part 11 outside thecore part 10 so that the cylindrical inner surface of theouter part 11 is in surface contact with and bonded to the cylindrical outer surface of theinner part 10. - As shown in
FIG. 3 , a keyed connection can be created between thecore part 10 and thegrinding part 11 in that thecore part 10 is provided with radially outwardly extendingcircumferential ridges 12 that engage in complementary radially inwardly openannular grooves 13 of thegrinding part 11. Alternatively as shown in the left half ofFIG. 3 , there areindividual bumps 14 andcomplementary recesses 15. Such projections or depressions are formed already at the time of production of the green compact by precompacting, such that the combined body, which is made of the precompacted core part and precompacted grinding part, is placed into a mold and subsequently heated to 180° C. to 200° C., then finally compacted to the above-given final dimensions. - According to the invention, aside from the matrix material in which are imbedded the abrasive particles made of, for example, aluminum oxide, the grinding part has a mass fraction of 0.15% to 1.0% of plastic or
glass fibers 17. A concrete embodiment provides for the use of about 100g glass fibers 17 of a mean length of 10 mm and a thickness of 1 mm for thecore part 10 and the grindingpart 11. Theglass fibers 17 were homogeneously blended. The core part had a total weight of 12 kg, while the grinding part, on the other hand, had a powder weigh-in of 49.5 kg. Two additional iron rings 16 are also embedded in the structure and have a weight of 1.0 kg, resulting in a total weight of 62.5 kg for the grinding wheel. In the illustrated embodiment, the glass fiber fraction of the weight of the grinding part and the core part was approximately 0.17%, respectively. - The grinding wheel was inspected during a test run at rotational speeds of 140 m/sec; chipped spots on larger parts of the grinding part or hair-line fractures that can result in detachments later on were not found. Contrary to grinding wheels without glass fiber content, by the targeted addition of
glass fibers 17 it is possible to achieve a considerable improvement in terms of the solidity of the grinding wheel.
Claims (12)
1. A grinding wheel comprising:
an inner core part; and
an outer annular grinding part connected the inner core part and comprised of a granular abrasive medium and plastic or glass fibers, the fibers forming between 0.15% and 1% by weight of the grinding part.
2. The grinding wheel defined in claim 1 , wherein the fibers form between 0.2% and 0.4% by weight of the grinding part.
3. The grinding wheel defined in claim 1 , wherein the fibers have a length of between 5 mm and 15 mm and a thickness between 0.8 mm and 1.2 mm.
4. The grinding wheel defined in claim 1 , wherein the core part has a substantially cylindrical outer peripheral surface formed with indentations and the outer grinding part has a substantially cylindrical inner peripheral surface engaging the outer surface and formed with projections complementary to and engaging into the indentations of the outer surface, whereby relative shifting of the parts at the surfaces is inhibited by inherit of the indentations and projections.
5. The grinding wheel defined in claim 1 wherein the grinding wheel is made of particles of Al2O3, SiC, CBN, ZrO2, diamond or mixtures thereof.
6. The grinding wheel defined in claim 5 , wherein the particles have particle sizes of a maximum diameter of 1 mm.
7. The grinding wheel defined in claim 1 wherein the core part and grinding part have thermal coefficients of expansion that deviate from each other by less than 5%.
8. The grinding wheel defined in claim 1 , wherein the grinding part has a matrix of a metal or metal alloy or of a thermally curable resin in which is embedded granules of abrasive media and the glass fibers in a generally homogenous distribution.
9. The grinding wheel defined in claim 8 , wherein the core part is substantially made of a metal or metals and filler materials.
10. The grinding wheel defined in claim 1 , wherein at least one of the parts contains a thermally curable resin and cross-linking agents and fillers.
11. The grinding wheel defined in claim 11 , wherein the fillers are as SiC, Al2O3, bauxite, graphite or molybdenum sulfide.
12. The grinding wheel defined in claim 1 wherein first the core part, then the grinding part are compacted by cold shaping to form a combined green compact that is heated to 180° C. to 200° C. and compacted to desired dimensions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012002105.4 | 2012-02-06 | ||
DE102012002105A DE102012002105A1 (en) | 2012-02-06 | 2012-02-06 | Grinding wheel, in particular for longitudinal or transverse grinding |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130203326A1 true US20130203326A1 (en) | 2013-08-08 |
Family
ID=47603294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/759,193 Abandoned US20130203326A1 (en) | 2012-02-06 | 2013-02-05 | Grinding wheel for longitudinal or transverse grinding |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130203326A1 (en) |
EP (1) | EP2623264B1 (en) |
CN (1) | CN103240684A (en) |
DE (1) | DE102012002105A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103770030A (en) * | 2013-12-31 | 2014-05-07 | 郑州磨料磨具磨削研究所有限公司 | Resin binder superhard material grinding wheel for roller high-speed grinding and manufacture method thereof |
CN105856081A (en) * | 2016-05-16 | 2016-08-17 | 郑州磨料磨具磨削研究所有限公司 | Finish-ground super-hard sand wheel for micro drilling and manufacturing method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107398837A (en) * | 2017-09-19 | 2017-11-28 | 广东新吉欣实业有限公司 | Abrasive wheel and its manufacturing process |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3661544A (en) * | 1969-11-28 | 1972-05-09 | Bmi Lab Industry | A method for making thermosetting resinous abrasive tools |
US20070084133A1 (en) * | 2005-10-18 | 2007-04-19 | 3M Innovative Properties Company | Agglomerate abrasive grains and methods of making the same |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3524286A (en) * | 1967-04-12 | 1970-08-18 | Carborundum Co | Resin bonded abrasive wheels containing fibrous and non-fibrous fillers |
DE2342217A1 (en) * | 1973-08-21 | 1975-03-13 | Swarovski Tyrolit Schleif | High speed grinding disc - has a zone of increased strength up to two thirds ring width in part of disc adjacent to disc bore |
CN2033323U (en) * | 1988-05-01 | 1989-03-01 | 李芧华 | Soft grinding head |
AT396213B (en) * | 1990-04-11 | 1993-07-26 | Swarovski Tyrolit Schleif | GRINDING WHEEL |
JP3011431B2 (en) * | 1990-05-11 | 2000-02-21 | 三和研磨工業株式会社 | Whetstone for precision polishing |
US5449388A (en) * | 1990-05-21 | 1995-09-12 | Wiand; Ronald C. | Injection molded abrasive article and process |
JPH08112767A (en) * | 1994-10-18 | 1996-05-07 | Daido Steel Co Ltd | Steel piece maintenance cleaning grinding wheel and steel piece maintenance cleaning grinding method |
DE19526397A1 (en) * | 1995-07-19 | 1997-01-23 | Eisenblaetter Gerd Gmbh | Plastic fibre loaded with abrasive grains during or after manufacture by extrusion or melt spinning |
CN1130274C (en) * | 1998-03-27 | 2003-12-10 | 诺顿公司 | Abrasive tools |
JP3538360B2 (en) * | 2000-03-02 | 2004-06-14 | 株式会社ノリタケカンパニーリミテド | Resinoid grinding wheel for heavy grinding |
DE10309021B4 (en) * | 2003-02-21 | 2005-02-24 | Schmirgelwerk Chemnitz Gmbh | abrasives |
CN103878706A (en) * | 2008-12-30 | 2014-06-25 | 圣戈班磨料磨具有限公司 | Reinforced Bonded Abrasive Tools |
-
2012
- 2012-02-06 DE DE102012002105A patent/DE102012002105A1/en not_active Withdrawn
-
2013
- 2013-01-14 EP EP13151133.9A patent/EP2623264B1/en active Active
- 2013-02-05 US US13/759,193 patent/US20130203326A1/en not_active Abandoned
- 2013-02-06 CN CN2013100460532A patent/CN103240684A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3661544A (en) * | 1969-11-28 | 1972-05-09 | Bmi Lab Industry | A method for making thermosetting resinous abrasive tools |
US20070084133A1 (en) * | 2005-10-18 | 2007-04-19 | 3M Innovative Properties Company | Agglomerate abrasive grains and methods of making the same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103770030A (en) * | 2013-12-31 | 2014-05-07 | 郑州磨料磨具磨削研究所有限公司 | Resin binder superhard material grinding wheel for roller high-speed grinding and manufacture method thereof |
CN105856081A (en) * | 2016-05-16 | 2016-08-17 | 郑州磨料磨具磨削研究所有限公司 | Finish-ground super-hard sand wheel for micro drilling and manufacturing method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP2623264A3 (en) | 2017-08-23 |
EP2623264A2 (en) | 2013-08-07 |
CN103240684A (en) | 2013-08-14 |
EP2623264B1 (en) | 2021-07-28 |
DE102012002105A1 (en) | 2013-08-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: EGON EVERTZ K.G. (GMBH & CO), GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EVERTZ, EGON;EVERTZ, RALF;EVERTZ, STEFAN;REEL/FRAME:029822/0288 Effective date: 20130213 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |