US4123878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Cincinnati Milacron Heald Corp
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Filing: 1977-07-14
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Granted: 1978-11-07
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Expires: 1997-07-14
Abstract
Abstract A grinding machine in which sparkout grinding is carried out for a period of time that is selected from workpiece to workpiece by a power meter means which terminates grinding when the power consumed by the wheel reaches a predetermined value, which value is varied from new wheel conditions to worn wheel conditions.
Inventors
- 👤 Robert H. Lizotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:28
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
228 words
A grinding machine for internal grinding, comprising: (a) a base on which are mounted a wheelhead for carrying a rotatable abrasive wheel and a workhead for carrying a workpiece having a bore to be finished, (b) a power meter means connected to the wheelhead to give a power signal indicative of power consumed by the wheelhead and to terminate a grinding cycle when the signal reaches an adjustable predetermined value, said meter means including control circuitry containing a switch and a bridge circuit, the bridge circuit having a first branch giving a reference signal and a second branch on which is impressed the said power signal, the switch being actuated to terminate the grinding cycle when the reference signal and the power signal are equal, (c) a wheelsize monitor for measuring the wheel and giving a size signal indicative of the size of the wheel, and (d) a zero shift control means receiving the signal from the wheel size monitor and adjusting the said predetermined value of the power meter means during the life of a wheel as it wears from its new wheel condition to its worn wheel condition, said predetermined value going from a high value at the new wheel condition to a low value at the worn wheel condition, said size signal being used to adjust the said reference signal with changes in wheel size.
Claim 2
Dependent Claim
228 words
A grinding machine for internal grinding, comprising: (a) a base on which are mounted a wheelhead for carrying a rotatable abrasive wheel and a workhead for carrying a workpiece having a bore to be finished, (b) a power meter means connected to the wheelhead to give a power signal indicative of power consumed by the wheelhead and to terminate a grinding cycle when the signal reaches an adjustable predetermined value, said meter means including control circuitry containing a switch and a bridge circuit, the bridge circuit having a first branch giving a reference signal and a second branch on which is impressed the said power signal, the switch being actuated to terminate the grinding cycle when the reference signal and the power signal are equal, (c) a wheelsize monitor for measuring the wheel and giving a size signal indicative of the size of the wheel, and (d) a zero shift control means receiving the signal from the wheel size monitor and adjusting the said predetermined value of the power meter means during the life of a wheel as it wears from its new wheel condition to its worn wheel condition, said predetermined value going from a high value at the new wheel condition to a low value at the worn wheel condition, said size signal being used to adjust the said reference signal with changes in wheel size.
Claim 3
Dependent Claim
39 words
A grinding machine as recited in claim 1, wherein the zero shift control contains operational amplifiers that convert the signal from the wheelsize monitor to a value that can be used to adjust the reference signal in the meter.
Claim 4
Dependent Claim
69 words
A grinding machine as recited in claim 2, wherein a feed mechanism is provided for bringing about relative movement between the wheelhead and the workhead to cause movement of the wheel with respect to the workpiece in accordance with a grinding cycle consisting of a rough grind, a dressing operation, a finish grind, and a sparkout grind, and wherein a dressing apparatus is provided to perform the dressing operation.
Claim 5
Dependent Claim
39 words
A grinding machine is recited in claim 3, wherein means is provided to terminate the finish grind at a given point in wheelhead cross-feed, the length of the sparkout being determined soley by the power meter and its switch.
Claim 6
Dependent Claim
28 words
A grinding machine as recited in claim 4, wherein the feed mechanism includes a hydraulic cyliner for producing controlled force grinding during a part of the grinding cycle.
Claim 7
Dependent Claim
29 words
A grinding machine as recited in claim 5, wherein the feed mechanism also includes a stepping motor for providing controlled rate grinding during a part of the grinding cycle.
References Cited (Backward Citations)
US3535828A
Cited
US3601930A
Cited
US3601929A
Cited
US3703054A
Cited
US3736704A
Cited
US3913277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |