GB2351088A - Grinding Wheels and Grinding method - Google Patents
Grinding Wheels and Grinding method Download PDFInfo
- Publication number
- GB2351088A GB2351088A GB9914029A GB9914029A GB2351088A GB 2351088 A GB2351088 A GB 2351088A GB 9914029 A GB9914029 A GB 9914029A GB 9914029 A GB9914029 A GB 9914029A GB 2351088 A GB2351088 A GB 2351088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grinding
- wheel
- forming
- grinding wheel
- cbn
- 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- Withdrawn
Links
Classifications
-
- 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
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
-
- 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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
-
- 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
- B24D3/14—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 ceramic, i.e. vitrified bondings
Abstract
A grinding wheel, particularly suitable for finish grinding a flat disc-like workpiece such as a semi-conductor wafer, is formed from industrial diamond fragments embedded in a vitreous compound. The invention also extends to an edge grinding machine having such a diamond grinding wheel, and a forming wheel preferably mounted on the work spindle, the latter being capable of removing vitreous compound from the grinding wheel to expose fresh diamond fragments during forming or reforming of the wheel.
Description
2351088 Title: Improved Grinding Wheels and Grinding method
Field of invention
This invention concerns grinding wheels and methods of grinding.
Backqround to the invention Historically rough grinding has tended to be performed using metal bonded grinding wheels, a semi final grinding step (sometimes called first finish grinding) has been performed using resin bonded CBN wheels, and a final (or second) finish grinding has tended to be performed using a diamond wheel. A fine ground finish can be obtained by using tiny pieces of industrial diamond bedded in a resin wheel, and three micron sized pieces of diamond are typical in such wheels.
In many ways it would be preferable to use CEN particles as the grinding material rather than diamond since CBN wheels can be formed in situ so as to expose unworn particles of CBN by removing the softer resin material in which they are embeddedduring the forming process.
Unfortunately CBN particles do not bond readily with the resin materials from which such wheels are formed, and the coating which is needed to bond CBN particles to the resin makes the particles too large for final finish grinding.
In consequence the full advantages of in situ wheel forming cannot be obtained since diamond grinding wheels cannot normally be formed in situ.
It is an object of the present invention to provide an improved diamond finishing wheel which can be formed and reformed in 2 situ.
It is another object of the invention to provide a semi-finish grinding wheel which can also be formed in situ in the same way as a resin bonded CBN semi-finishing wheel can.
Summary of the invention
According to one aspect of the present invention a finish grinding wheel is formed from industrial diamond fragments embedded in a vitreous compound. It has been found that diamond fragment bonds to the vitreous material without the need for a binder or coating and this allows a fine grinding finish to be obtained with such wheels.
The advantage is that the vitreous material like the resin of a CBN resin bonded wheel, tends to wear in use and as the diamond grit becomes worn or removed from the face of the wheel, so that the grinding efficiency of the wheel reduces, the grinding surface can be reformed in manner known per se, so that the diamond grit is once again exposed for grinding.
An edge grinding machine may therefore comprise a work spindle with drive means therefor, a vacuum chuck for mounting to thespindle a flat disclike workpiece, a grinding wheel adapted to be moved into engagement with the edge of the workpiece, drive means for rotating the grinding wheel, means for dressing the grinding surface of the grinding wheel as the latter becomes worn with use, and means for moving the grinding wheel or the forming wheel so as to engage the forming wheel with the grinding surface of the grinding wheel whilst both are rotating to reform the wheel as required, wherein the grinding wheel -is formed from grinding particles embedded in at least the circumferential face of a wheel of vitreous material and a forming wheel is selected which is capable of removing vitreous material and exposing the grinding particle during the forming and reforming steps to restore the grinding efficiency of the 3 wheel.
In a preferred arrangement the forming wheel is mounted to the rear of the vacuum chuck on the work spindle and rotates therewith.
Depending on the size of the grit, the wheel may be used for rough grinding or for semi-finish grinding.
By selecting very small industrial diamond fragments for the grinding particl.es, the resulting wheel can be used for finish grinding.
Where the wheel is to be used for rough grinding or semi-finish grinding, the grinding grit in the wheel may be CBN particles.
According to another aspect of the invention a grinding wheel suitable for both rough grinding or semi-finish grinding has particles of CBN material embedded in at least a circumferential region of the wheel and at least the latter is formed from a vitreous material.
According to another aspect of the invention a method of binding tiny fragments of CBN material in a wheel for grinding workpiece surfaces comprises the step of selecting for at least the radially outer peripheral region of a circular disc, a vitreous material in which CBN particles will bond without the need for an intermediate coating, and forming the said region of the disc from that vitreous material, and embedding the CBN fragments therein.
4
Claims (9)
1. A grinding wheel, suitable for finish grinding, which is formed from industrial diamond fragments embedded in a vitreous compound, and which allows a fine grinding finish to be obtained.
2. The combination of a grinding wheel according to claim 1 and an edge grinding machine, comprising a work spindle with drive means therefor, a vacuum chuck for mounting to the spindle a flat disc-like workpiece, the grinding wheel being adapted to be moved into engagement with the edge of the workpiece, drive means for rotating the grinding wheel, a forming wheel for dressing the grinding surface of the grinding wheel as the latter becomes worn with use, and means for moving the grinding wheel or the forming wheel so as to engage the forming wheel with the grinding surface of the grinding wheel whilst both are rotating to reform the grinding wheel as required, wherein the forming wheel is capable of removing the vitreous compound material of the grinding wheel and exposing the diamond fragments during the forming and reforming steps to restore the grinding efficiency of the wheel.
3. An edge grinding machine comprising a work spindle with drive means therefor, a vacuum chuck for mounting to the spindle a flat disc-like workpiece, the grinding wheel adapted to be moved into engagement with the edge of the workpiece, drive means for rotating the grinding wheel, a forming wheel for dressing the grinding surface of the grinding wheel as the latter becomes worn with use, and means for moving the grinding wheel or the forming wheel so as to engage the forming wheel with the grinding surface of the grinding wheel whilst both are rotating to reform the grinding wheel as required, wherein the grinding wheel is formed from grinding particles embedded in at least the circumferential face of a wheel of vitreous material and the forming wheel is selected to be capable of removing the vitreous material and exposing the grinding particle during the forming and reforming steps to restore the grinding efficiency of the wheel.
4. A machine according to claim 3 in which the forming wheel is mounted to the rear of the vacuum chuck on the work spindle and rotates therewith.
5. A machine according to claim 3 or claim 4 in which the grinding wheel is used for rough grinding or for semi-finish grinding.
6. A machine according to claim 5 in which the particles in the grinding wheel are CBN particles.
7. A machine according to claim 3 or claim 4 in which the grinding particles are selected from industrial diamond fragments, and the resulting grinding wheel is used for finish grinding.
8. A grinding wheel suitable for both rough grinding and semifinish grinding and having particles of CBN material embedded in at least a circumferential region of the wheel, at least the latter being formed from a vitreous material.
9. A method of binding fragments of CBN material in a wheel for grinding workpiece surfaces, comprising the step of selecting for at least the radially outer peripheral region of a circular disc, a vitreous material in which CBN fragments will bond without the need for an intermediate coating, and forming the said region of the disc from that vitreous material, and embedding the CBN fragments therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9914029A GB2351088A (en) | 1999-06-17 | 1999-06-17 | Grinding Wheels and Grinding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9914029A GB2351088A (en) | 1999-06-17 | 1999-06-17 | Grinding Wheels and Grinding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9914029D0 GB9914029D0 (en) | 1999-08-18 |
| GB2351088A true GB2351088A (en) | 2000-12-20 |
Family
ID=10855477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9914029A Withdrawn GB2351088A (en) | 1999-06-17 | 1999-06-17 | Grinding Wheels and Grinding method |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2351088A (en) |
-
1999
- 1999-06-17 GB GB9914029A patent/GB2351088A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB9914029D0 (en) | 1999-08-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |