Patent JPS5844710A successfully refreshed from Google Patents.
US4561218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Close tolerance internal grinding using coolant mist
Assignee: DPBG Corp A CORP OF DELAWARE
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Filing: 1985-02-08
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Granted: 1985-12-31
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Expires: 2005-02-08
Abstract
Abstract In the internal grinding of a cylindrical bore having an oil or similar groove which adversely affects the bore roundness achievable, one or more streams of liquid coolant are directed over the grinding wheel during rough grinding at a high wheel feed rate and only a mist of liquid coolant droplets suspended in a compressed air stream is directed over the wheel once the high wheel feed rate has been reduced to the lower wheel feed rate associated with finish grinding. Means are provided for terminating the liquid coolant streams at the time the wheel feed rate is changed or after a short delay period thereafter to establish equilibrium finish grind conditions. Preferably, the change from one or more liquid coolant streams to the coolant mist is made in response to a detected decrease in wheel spindle motor power.
Inventors
- 👤 Victor F. Dzewaltowski
- 👤 Steven P. Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:13
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/02; B24B5/06; B24B55/00; B24B55/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
In grinding an internal cylindrical bore having an interruption in the bore wall which adversely affects the bore roundness tolerance achievable by said grinding, the steps for improving bore roundness comprising radially feeding a rotating grinding wheel relative to the bore longitudinal axis and bore wall, respectively, in a rough grind stage with a high radial feed rate and with a stream of liquid coolant discharging on the grinding wheel and in a subsequent finish grind stage with the radial feed rate reduced and with the liquid coolant stream discontinued and a mist of liquid coolant droplets suspended in a gaseous stream discharging on the grinding wheel.
Claim 2
Dependent Claim
107 words
In grinding an internal cylindrical bore having an interruption in the bore wall which adversely affects the bore roundness tolerance achievable by said grinding, the steps for improving bore roundness comprising radially feeding a rotating grinding wheel relative to the bore longitudinal axis and bore wall, respectively, in a rough grind stage with a high radial feed rate and with a stream of liquid coolant discharging on the grinding wheel and in a subsequent finish grind stage with the radial feed rate reduced and with the liquid coolant stream discontinued and a mist of liquid coolant droplets suspended in a gaseous stream discharging on the grinding wheel.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the liquid coolant stream discharge on the grinding wheel is discontinued when the feed rate is reduced to that for the finish grind stage after a delay period following such reduction.
Claim 4
Independent Claim
50 words
The method of claims 1 or 2 wherein a spark-out stage follows the finish grind stage and wherein the mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during both the finish grind and spark-out stages without discharge of the liquid coolant stream.
Claim 5
Dependent Claim
145 words
In grinding an internal cylindrical bore having an interruption in the bore wall which adversely affects the bore roundness achievable by said grinding, the steps for improving bore roundness comprising radially feeding a rotating grinding wheel relative to the bore longitudinal axis and bore wall, respectively, in a rough grind stage at a high feed rate and in a subsequent finish grind stage at a reduced feed rate including monitoring the torque load on said grinding wheel during said rough grind stage and finish grind stage, wherein a stream of liquid coolant is discharged on the grinding wheel during the rough grind stage, said liquid coolant stream is discontinued when said torque load decreases as a result of said reduced feed rate and a mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during the finish grind stage.
Claim 6
Dependent Claim
145 words
In grinding an internal cylindrical bore having an interruption in the bore wall which adversely affects the bore roundness achievable by said grinding, the steps for improving bore roundness comprising radially feeding a rotating grinding wheel relative to the bore longitudinal axis and bore wall, respectively, in a rough grind stage at a high feed rate and in a subsequent finish grind stage at a reduced feed rate including monitoring the torque load on said grinding wheel during said rough grind stage and finish grind stage, wherein a stream of liquid coolant is discharged on the grinding wheel during the rough grind stage, said liquid coolant stream is discontinued when said torque load decreases as a result of said reduced feed rate and a mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during the finish grind stage.
Claim 7
Dependent Claim
48 words
The method of claim 4 wherein a spark-out stage follows the finish grind stage and wherein the mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during both the finish grind and spark-out stages without discharge of the liquid coolant stream.
Claim 8
Dependent Claim
138 words
In grinding an internal cylindrical bore having an interruption in the bore wall which adversely affects the bore roundness achievable by said grinding, the steps for improving bore roundness comprising radially feeding a rotating grinding wheel relative to the bore longitudinal axis and bore wall, respectively, in a rough grind stage at a high feed rate and in a subsequent finish grind stage at a reduced feed rate including monitoring bore size during said rough grind stage and finish grind stage, wherein a stream of liquid coolant is discharged on the grinding wheel during the rough grind stage, said liquid coolant stream is discontinued when said bore size reaches a preselected value for finish grinding and a mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during the finish grind stage.
Claim 9
Dependent Claim
138 words
In grinding an internal cylindrical bore having an interruption in the bore wall which adversely affects the bore roundness achievable by said grinding, the steps for improving bore roundness comprising radially feeding a rotating grinding wheel relative to the bore longitudinal axis and bore wall, respectively, in a rough grind stage at a high feed rate and in a subsequent finish grind stage at a reduced feed rate including monitoring bore size during said rough grind stage and finish grind stage, wherein a stream of liquid coolant is discharged on the grinding wheel during the rough grind stage, said liquid coolant stream is discontinued when said bore size reaches a preselected value for finish grinding and a mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during the finish grind stage.
Claim 10
Dependent Claim
48 words
The method of claim 6 wherein a spark-out stage follows the finish grind stage and wherein the mist of liquid coolant droplets suspended in a gaseous stream is discharged on the grinding wheel during both the finish grind and spark-out stages without discharge of the liquid coolant 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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |