US3634976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Heald Machine Co
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Filing: 1969-10-29
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Granted: 1972-01-18
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Expires: 1989-10-29
Abstract
Abstract This invention relates to a grinding machine and, more particularly, to apparatus for generating a surface of revolution by the abrasive process, wherein the feed is regulated to maintain the force between the abrasive wheel and the workpiece at a predetermined value.
Inventors
- 👤 Robert S Hahn
- 👤 Richard P Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:22
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
210 words
A grinding machine for generating on a workpiece a surface of revolution having generatrices that are relatively long compared to the width of the grinding surface of the abrasive wheel used on the machine, comprising a. a base, b. a workhead for supporting the workpiece and rotating it about the axis of the surface of revolution, c. a wheelhead in which a spindle for carrying the abrasive wheel is rotatably mounted, d. an actuator, responsive to control signals, for bringing about movement between the workhead and the wheelhead longitudinally of the axis of the said spindle, e. Feed means for regulating the movement between the workhead and the wheelhead transversely of the axis of the spindle, the feed means including a hydraulic cylinder for producing a primary moving force and a stepping motor for producing a secondary regulation of the transverse movement, f. a sensor for measuring the force of contact between the abrasive wheel and the workpiece during grinding and generating a signal proportional thereto, g. a control receiving the signal from the sensor and delivering command signals to the actuator and to the feed means to cause the wheel to move over the workpiece in accordance with a predetermined pattern, while maintaining the force at a predetermined value.
Claim 2
Dependent Claim
210 words
A grinding machine for generating on a workpiece a surface of revolution having generatrices that are relatively long compared to the width of the grinding surface of the abrasive wheel used on the machine, comprising a. a base, b. a workhead for supporting the workpiece and rotating it about the axis of the surface of revolution, c. a wheelhead in which a spindle for carrying the abrasive wheel is rotatably mounted, d. an actuator, responsive to control signals, for bringing about movement between the workhead and the wheelhead longitudinally of the axis of the said spindle, e. Feed means for regulating the movement between the workhead and the wheelhead transversely of the axis of the spindle, the feed means including a hydraulic cylinder for producing a primary moving force and a stepping motor for producing a secondary regulation of the transverse movement, f. a sensor for measuring the force of contact between the abrasive wheel and the workpiece during grinding and generating a signal proportional thereto, g. a control receiving the signal from the sensor and delivering command signals to the actuator and to the feed means to cause the wheel to move over the workpiece in accordance with a predetermined pattern, while maintaining the force at a predetermined value.
Claim 3
Dependent Claim
26 words
A grinding machine as recited in claim 1, wherein the generatrices of the surface of revolution are inclined to both the longitudinal and the transverse directions.
Claim 4
Dependent Claim
23 words
A grinding machine as recited in claim 1, wherein the control includes computing apparatus which receives the said predetermined pattern in machine language.
Claim 5
Dependent Claim
97 words
A grinding machine for generating an internal surface of revolution on a workpiece, comprising a. a base on which are mounted a workhead and a wheelhead, b. stepping motors for moving the workhead and wheelhead in directions extending longitudinally and transversely of a spindle carrying an abrasive wheel, c. a control including data processing apparatus for controlling the introduction of electrical pulses to the motors to cause the abrasive wheel to move across the workpiece in a predetermined pattern while maintaining the force of contact between the wheel and the workpiece during grinding at a predetermined value.
Claim 6
Dependent Claim
97 words
A grinding machine for generating an internal surface of revolution on a workpiece, comprising a. a base on which are mounted a workhead and a wheelhead, b. stepping motors for moving the workhead and wheelhead in directions extending longitudinally and transversely of a spindle carrying an abrasive wheel, c. a control including data processing apparatus for controlling the introduction of electrical pulses to the motors to cause the abrasive wheel to move across the workpiece in a predetermined pattern while maintaining the force of contact between the wheel and the workpiece during grinding at a predetermined value.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |