US3867794A
Expired / Lapsed
US
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Grinding machine
Assignee: Cincinnati Milacron Heald Corp
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Filing: 1974-03-08
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Granted: 1975-02-25
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Expires: 1994-03-08
Abstract
Abstract A grinding machine having means for memorizing retraction movement and re-introducing it minus a preselected amount.
Inventors
- 👤 Edward G Robillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/10; B24B49/18; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4166; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41326; G05B2219/43; G05B2219/43152; G05B2219/45; G05B2219/45159; G05B2219/45161
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
178 words
A grinding machine for the finishing of a surface of revolution on a workpiece, comprising a. a base, b. a workhead mounted on the base for supporting the workpiece, c. a wheelhead mounted on the base for carrying a spindle with an abrasive wheel, d. a dressing apparatus, e. control means bringing about relative movement between the wheelhead and workhead longitudinally and transversely of the axis of the said surface of revolution to produce a grinding cycle between the wheel and the workpiece, the cycle consisting of a rough grind, a dress, and a finish grind, f. means connected to the control means to determine a point of termination of the rough grind when the surface reaches a predetermined size, and g. means measuring the distance from a predetermined point to the point of termination of the rough grind, backing the wheel that same distance for the dressing operation, and later returning the wheel that same distance minus a preset distance, so that the finish grind can start without loss of time and without striking the workpiece prematurely.
Claim 2
Dependent Claim
178 words
A grinding machine for the finishing of a surface of revolution on a workpiece, comprising a. a base, b. a workhead mounted on the base for supporting the workpiece, c. a wheelhead mounted on the base for carrying a spindle with an abrasive wheel, d. a dressing apparatus, e. control means bringing about relative movement between the wheelhead and workhead longitudinally and transversely of the axis of the said surface of revolution to produce a grinding cycle between the wheel and the workpiece, the cycle consisting of a rough grind, a dress, and a finish grind, f. means connected to the control means to determine a point of termination of the rough grind when the surface reaches a predetermined size, and g. means measuring the distance from a predetermined point to the point of termination of the rough grind, backing the wheel that same distance for the dressing operation, and later returning the wheel that same distance minus a preset distance, so that the finish grind can start without loss of time and without striking the workpiece prematurely.
Claim 3
Dependent Claim
31 words
A grinding machine as recited in claim 1, wherein the said preset distance is determined by a digital switch mounted on the front of the machine and adjustable by the operator.
Claim 4
Dependent Claim
60 words
A grinding machine as recited in claim 2, wherein the front of the machine is provided with a digital readout which shows at all times the transverse positional relationship between the wheel and the workpiece and which gives a reading of ZERO at the end of each grinding cycle, so that the operator can observe any differences between successive cycles.
Claim 5
Dependent Claim
25 words
A grinding machine as recited in claim 1, wherein the transverse relative movement between the workhead and the wheelhead is produced by a stepping motor.
Claim 6
Dependent Claim
52 words
A grinding machine as recited in claim 4, wherein the means connected to the control means is a gage, and wherein a feed means forming part of the control means is provided for pressing the wheel against the workpiece with a controlled force during an initial major portion of the rough grind.
Claim 7
Dependent Claim
73 words
A grinding machine as recited in claim 4, wherein a generator is provided to transmit electrical pulses to the stepping motor, wherein a memory counts the number of pulses transmitted from the said predetermined point to the termination point when the gage indicates that the predetermined size has been reached, and wherein the said number of pulses is partially reintroduced in reverse to the stepping motor to return for the continuation of grinding.
Claim 8
Dependent Claim
31 words
A grinding machine as recited in claim 6, wherein the wheelhead table has a second stop which engages the compensation slide at a second point in the relative movement between them.
Claim 9
Dependent Claim
86 words
A grinding machine as recited in claim 7, wherein a control introduces a preselected number of pulses to the stepping motor as a compensation before dressing, introduces and memorizes a number of pulses to move the compensation slide the said distance from the predetermined point to the point of termination of the rough grind, reintroduces the same number of pulses in reverse mode to the stepping motor before dress, and reintrodUces the same number of pulses in direct mode to the stepping motor after the dress.
Claim 10
Dependent Claim
56 words
A grinding machine as recited in claim 8, wherein the control also introduces a number of pulses in direct mode to the stepping motor for a reset movement of the compensation slide before the rough grind and reintroduces the same number minus a preset number of pulses in reverse mode for a retract movement after dress.
Claim 11
Dependent Claim
75 words
A grinding machine as recited in claim 9, wherein a hydraulic cylinder is provided to produce rapid movement of the wheelhead table relative to the compensation slide from the first point to the second point and vice versa, the cylinder being operative at the termination of the rough grind to produce the movement in one direction before dress and being operative before the finish grind to produce the movement in the other direction after dress.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |