US3823515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means of grinding with electrophoretic assistance
Assignee: Saint Gobain Abrasives Inc
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Filing: 1973-03-27
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Granted: 1974-07-16
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Expires: 1993-03-27
Abstract
Abstract A grinding system in which an electrically conductive workpiece is moved against and relative to a rotating grinding wheel, an electrode spaced from and electrically insulated from the workpiece, means to maintain the space between the workpiece and the electrode filled with an electrically substantially nonconducting coolant fluid containing electrically charged particles of a cutting fluid or other cutting agent, and a direct current power source connected to so charge the workpiece and the electrode that the charged particles of a cutting fluid or other cutting agent migrate to and form a film upon the surface of the workpiece as it passes beneath the grinding wheel.
Inventors
- 👤 L Coes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:16
CPC Classifications
B; B24; B24B; B24B1/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A grinding system comprising, a moving grinding element for an electrically conductive workpiece moving against and relative to the grinding element, electrode means spaced and electrically insulated from the surface to be ground of the workpiece, an electrically substantially nonconducting liquid stream comprising electrically charged particles of a cutting agent entrained in a coolanc fluid, means arranged to deliver said liquid stream to the space between the electrode means and the workpiece, and a source of direct electrical current operatively connected to maintain the electrode means and the workpiece oppositely charged, the electrically charged particles of a cutting agent being attracted to the workpiece, whereby a film of the cutting agent is deposited by electrophoresis upon the surface to be ground of the workpiece.
Claim 2
Dependent Claim
124 words
A grinding system comprising, a moving grinding element for an electrically conductive workpiece moving against and relative to the grinding element, electrode means spaced and electrically insulated from the surface to be ground of the workpiece, an electrically substantially nonconducting liquid stream comprising electrically charged particles of a cutting agent entrained in a coolanc fluid, means arranged to deliver said liquid stream to the space between the electrode means and the workpiece, and a source of direct electrical current operatively connected to maintain the electrode means and the workpiece oppositely charged, the electrically charged particles of a cutting agent being attracted to the workpiece, whereby a film of the cutting agent is deposited by electrophoresis upon the surface to be ground of the workpiece.
Claim 3
Dependent Claim
49 words
A grinding system as described in claim 1, wherein said particles of a cutting agent are negatively charged droplets of oil emulsified in the cooling fluid, and wherein said source of direCt electrical current is operatively connected to maintain the electrode means negative and to maintain the workpiece positive.
Claim 4
Dependent Claim
52 words
A grinding system as described in claim 2 and, in addition, means operative after a grinding operation is completed to disconnect said source of direct electrical current from a workpiece, whereby the liquid stream is effective to reemulsify the droplets of oil in the coolant fluid from the surface of the workpiece.
Claim 5
Dependent Claim
49 words
A grinding system as described in claim 2 and, in addition, means operative after a grinding operation is completed to reverse the polarity of the electrode means and of a workpiece, whereby the oil droplets collected on the surface of the workpiece are rapidly returned to the liquid stream.
Claim 6
Dependent Claim
19 words
A grinding system as described in claim 1, wherein said particles of a cutting agent are a fluorinated hydrocarbon.
Claim 7
Dependent Claim
17 words
A grinding system as described in claim 1, wherein said particles of a cutting agent are tetrafluoroethylene.
Claim 8
Independent Claim
131 words
A method of grinding an electrically conductive workpiece, comprising, moving a grinding element, moving an electrically conductive workpiece against and relative to the grinding element, supporting an electrode means spaced and electrically insulated from the surface to be ground of a workpiece, delivering to the space between the electrode means and a workpiece an electrically substantially nonconducting liquid stream containing electrically charged particles of a cutting agent entrained in a cooling fluid, connecting a source of direct electrical current so as to maintain the electrode means and a workpiece oppositely so charged that the electrically charged particles of a cutting agent are attracted to a workpiece, whereby the grinding operation is performed under a film of the cutting agent deposited by electrophoresis upon the surface to be ground of a workpiece.
Claim 9
Independent Claim
131 words
A method of grinding an electrically conductive workpiece, comprising, moving a grinding element, moving an electrically conductive workpiece against and relative to the grinding element, supporting an electrode means spaced and electrically insulated from the surface to be ground of a workpiece, delivering to the space between the electrode means and a workpiece an electrically substantially nonconducting liquid stream containing electrically charged particles of a cutting agent entrained in a cooling fluid, connecting a source of direct electrical current so as to maintain the electrode means and a workpiece oppositely so charged that the electrically charged particles of a cutting agent are attracted to a workpiece, whereby the grinding operation is performed under a film of the cutting agent deposited by electrophoresis upon the surface to be ground of a workpiece.
Claim 10
Dependent Claim
51 words
A method of grinding an electrically conductive workpiece as described in claim 7, and further comprising, disconnecting the source of direct electrical current so as to deenergize a workpiece, whereby the particles of a cutting agent forming a film upon the surface of a workpiece are reentrained in the liquid stream.
Claim 11
Dependent Claim
64 words
A method of grinding an electrically conductive workpiece as described in claim 7, and further comprising, reversing the connections to a source of direct electrical current so as to reverse the charges upon the electrode means and a workpiece, whereby the particles of a cutting agent forming a film upon the surface of a workpiece are detached therefrom and reentrained in the liquid stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |