US3811228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling the accuracy of machining of a machine tool
Assignee: Shibaura Machine Co Ltd
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Filing: 1971-12-28
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Granted: 1974-05-21
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Expires: 1991-12-28
Abstract
Abstract A method of controlling a machine tone to improve the accuracy of machining which has the steps of detecting the cutting power of a machine tool, comparing the value of the detecting cutting power with a predetermined value of a in-feed power, and controlling the cutting speed of the tool driven by an electric motor so that the in-feed speed is hastened when the difference of both the values of the detected cutting power and a predetermined cutting power is within a predetermined range and the value of the detected cutting power is larger than that of the predetermined cutting power, while the in-feed speed is lessened when the value of the detected cutting power is smaller than that of the predetermined cutting power so as to compensate the wear of the tool. This method is performed by an automatic grinding machine of a roll grinding machine which has a mechanism for compensating the wear of a grinding wheel, a mechanism for compensating the resilient deformations of a grinding wheel, wheel station and roll for controlling the position of the wheel station, means for rotating an electric motor for in-feeding the grinding wheel to cut in normal or reverse direction so as to increase or decrease the cutting, and means for controlling the rotation of the electric motor so as to be proportional to the amplitude of a signal obtained by the in-feed speed of the grinding wheel for compensating the resilient deformation of the grinding wheel, wheel station and roll.
Inventors
- 👤 K Nagashima
- 👤 T Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:45
CPC Classifications
F; F16; F16D; F16D1/00; F16D1/06; B; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/12; B23Q15/16; B23Q15/18; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
A method of improving the machining accuracy of a machine tool comprising the steps of: detecting the cutting power of the machine tool; comparing a value of the detected cutting power with a preset valUe of cutting power; and controlling the rotating speed of an electric motor for giving an in-feed to the tool so that said rotating speed of the motor is increased when the difference between both values of cutting power is within a predetermined range and the value of the detected cutting power is larger than the preset value of cutting power, and said rotating speed of the motor is decreased when the difference between said both values is within the predetermined range and the value of the detected cutting power is smaller than the preset value of cutting power, whereby the wear of the tool is compensated during the machining operation.
Claim 2
Independent Claim
145 words
A method of improving the machining accuracy of a machine tool comprising the steps of: detecting the cutting power of the machine tool; comparing a value of the detected cutting power with a preset valUe of cutting power; and controlling the rotating speed of an electric motor for giving an in-feed to the tool so that said rotating speed of the motor is increased when the difference between both values of cutting power is within a predetermined range and the value of the detected cutting power is larger than the preset value of cutting power, and said rotating speed of the motor is decreased when the difference between said both values is within the predetermined range and the value of the detected cutting power is smaller than the preset value of cutting power, whereby the wear of the tool is compensated during the machining operation.
Claim 3
Independent Claim
288 words
A method of improving the machining accuracy in a traverse grinding work of a roll grinding machine comprising the steps of: giving an in-feed to a grinding wheel until the grinding current of an electric motor driving the grinding wheel reaches a predetermined grinding current at the starting point of the traverse grinding work; compensating for the wear of the grinding wheel during the traverse grinding work by: detecting the grinding power of the grinding wheel; comparing a value of the detected grinding power with a preset value of grinding power; controlling the rotating speed of an electric motor giving said in-feed to the grinding wheel so that said rotating speed is increased when the difference between both said values of grinding power is within a predetermined range and the value of the detected grinding power is larger than the preset value of grinding power, and said rotating speed of the motor is decreased when the difference between said both values is within the predetermined range and the value of the detected grinding power is smaller than the preset value of grinding power, whereby the wear of the grinding wheel is compensated during the traverse grinding work; comparing the grinding current with said predetermined grinding current at the end of the traverse grinding work, controlling said grinding current so that the rate of compensation of the wear of the grinding wheel is controlled by reducing said grinding current when the grinding current is larger than said predetermined grinding current, and by increasing said grinding current when the grinding current is smaller than said predetermined grinding current by providing a counter for conducting the calculation whereby the wear of the grinding wheel is compensated during the traverse grinding work.
Claim 4
Independent Claim
288 words
A method of improving the machining accuracy in a traverse grinding work of a roll grinding machine comprising the steps of: giving an in-feed to a grinding wheel until the grinding current of an electric motor driving the grinding wheel reaches a predetermined grinding current at the starting point of the traverse grinding work; compensating for the wear of the grinding wheel during the traverse grinding work by: detecting the grinding power of the grinding wheel; comparing a value of the detected grinding power with a preset value of grinding power; controlling the rotating speed of an electric motor giving said in-feed to the grinding wheel so that said rotating speed is increased when the difference between both said values of grinding power is within a predetermined range and the value of the detected grinding power is larger than the preset value of grinding power, and said rotating speed of the motor is decreased when the difference between said both values is within the predetermined range and the value of the detected grinding power is smaller than the preset value of grinding power, whereby the wear of the grinding wheel is compensated during the traverse grinding work; comparing the grinding current with said predetermined grinding current at the end of the traverse grinding work, controlling said grinding current so that the rate of compensation of the wear of the grinding wheel is controlled by reducing said grinding current when the grinding current is larger than said predetermined grinding current, and by increasing said grinding current when the grinding current is smaller than said predetermined grinding current by providing a counter for conducting the calculation whereby the wear of the grinding wheel is compensated during the traverse grinding work.
Claim 5
Independent Claim
169 words
A method of improving the machining accuracy of a machine tool comprising the steps of: detecting the cutting power of a machine tool; comparing a value of the detected cutting power with a preset value of cutting power; and moving a tool and a tool carriage by an electric motor for giving an in-feed to the tool so that the tool and the tool carriage are directed toward a material to be machined when the difference between said both values of cutting power is within a predetermined range and the value of the detected cutting power is larger than the preset value of cutting power, and so that the tool and the tool carriage are directed away from the material to be machined when the difference between said both values is within said predetermined range and the value of the detected cutting power is smaller than the preset value of cutting power wereby resilient deformations of the tool, the tool carriage and the material to be machined are compensated.
Claim 6
Independent Claim
169 words
A method of improving the machining accuracy of a machine tool comprising the steps of: detecting the cutting power of a machine tool; comparing a value of the detected cutting power with a preset value of cutting power; and moving a tool and a tool carriage by an electric motor for giving an in-feed to the tool so that the tool and the tool carriage are directed toward a material to be machined when the difference between said both values of cutting power is within a predetermined range and the value of the detected cutting power is larger than the preset value of cutting power, and so that the tool and the tool carriage are directed away from the material to be machined when the difference between said both values is within said predetermined range and the value of the detected cutting power is smaller than the preset value of cutting power wereby resilient deformations of the tool, the tool carriage and the material to be machined are compensated.
Claim 7
Independent Claim
94 words
A method of improving the machining accuracy of a machine tool comprising the steps of: detecting the cutting power of a machine tool; differentiating a value of the detected cutting power with respect to time, and controlling the in-feed speed of a tool by controlling the rotating speed of an electric motor for giving an in-feed to the tool so that said in-feed speed of the tool is proportional to an output of the differentiated cutting power, whereby resilient deformations of the tool, a tool carriage and a material to be machined are compensated.
Claim 8
Independent Claim
94 words
A method of improving the machining accuracy of a machine tool comprising the steps of: detecting the cutting power of a machine tool; differentiating a value of the detected cutting power with respect to time, and controlling the in-feed speed of a tool by controlling the rotating speed of an electric motor for giving an in-feed to the tool so that said in-feed speed of the tool is proportional to an output of the differentiated cutting power, whereby resilient deformations of the tool, a tool carriage and a material to be machined are compensated.
Claim 9
Dependent Claim
366 words
An automatic grinding apparatus for use in a traverse grinding work of a roll grinding machine comprising: a first electric motor for driving a grinding wheel; a second electric motor for giving an in-feed to said grinding wheel; means for controlling the grinding current of said first electric motor so that said grinding current becomes equal to a predetermined grinding current; means for detecting said grinding current; means for comparing a value of the detected grinding current with a preset value of grinding current; means for controlling the rotating speed of said second electric motor so that said rotating speed is increased when the difference between both values of grinding current is within a predetermined range and the value of the detecting grinding current is larger than the preset value of grinding current, and so that said rotating speed is reduced when the difference between said both values is within the predetermined range and the value of the detected grinding current is smaller than the preset value of grinding current; means for controlling the position of the grinding wheel and a grinding wheel carriage so that the grinding wheel and the grinding wheel carriage are directed toward a material to be ground when the difference between said both values is within a predetermined range and the value of the detected grinding current is larger than the preset value of grinding current, and so that the grinding wheel and the grinding wheel carriage are directed away from the material to be ground when the difference between said both values is within said predetermined range and the value of the detected grinding current is smaller than the preset value of grinding current; and means for controlling said grinding current so that the rate of compensation of the wear of the grinding wheel is controlled by reducing said grinding current when the value of the detected grinding current is larger than said preset value of grinding current, and by increasing said grinding current when the value of the detected grinding current is smaller than the preset value of grinding current, whereby resilient deformations of the grinding wheel, the grinding wheel carriage and the material to be ground are compensated.
Claim 10
Dependent Claim
366 words
An automatic grinding apparatus for use in a traverse grinding work of a roll grinding machine comprising: a first electric motor for driving a grinding wheel; a second electric motor for giving an in-feed to said grinding wheel; means for controlling the grinding current of said first electric motor so that said grinding current becomes equal to a predetermined grinding current; means for detecting said grinding current; means for comparing a value of the detected grinding current with a preset value of grinding current; means for controlling the rotating speed of said second electric motor so that said rotating speed is increased when the difference between both values of grinding current is within a predetermined range and the value of the detecting grinding current is larger than the preset value of grinding current, and so that said rotating speed is reduced when the difference between said both values is within the predetermined range and the value of the detected grinding current is smaller than the preset value of grinding current; means for controlling the position of the grinding wheel and a grinding wheel carriage so that the grinding wheel and the grinding wheel carriage are directed toward a material to be ground when the difference between said both values is within a predetermined range and the value of the detected grinding current is larger than the preset value of grinding current, and so that the grinding wheel and the grinding wheel carriage are directed away from the material to be ground when the difference between said both values is within said predetermined range and the value of the detected grinding current is smaller than the preset value of grinding current; and means for controlling said grinding current so that the rate of compensation of the wear of the grinding wheel is controlled by reducing said grinding current when the value of the detected grinding current is larger than said preset value of grinding current, and by increasing said grinding current when the value of the detected grinding current is smaller than the preset value of grinding current, whereby resilient deformations of the grinding wheel, the grinding wheel carriage and the material to be ground are compensated.
Claim 11
Dependent Claim
309 words
An automatic grinding apparatus for use in a traverse grinding work of a roll grinding machine comprising: a first electric motor for driving a grinding wheel; a second electric motor for giving an in-feed to said grinding wheel; means for controlling the grinding current of said first electric motor so that said grinding current becomes equal to a predetermined grinding current; means for detecting said grinding current; means for comparing a value of the detected grinding current with a preset value of grinding current; means for controlling the rotating speed of said second electric motor so that said rotating speed is increased when the difference between both values of grinding current is within a predetermined range and the value of the detected grinding current is larger than the preset value of grinding current, and so that said rotating speed is reduced when the difference between said both values is within the predetermined range and the value of the detected grinding current is smaller than the preset value of grinding current; means for differentiating the value of the detected grinding current with respect to time; means for controlling the in-feed speed of the grinding wheel by controlling the rotating speed of said second electric motor so that the in-feed speed of the grinding wheel is proportional to an output of the differentiated grinding current; and means for controlling said grinding current so that the rate of compensation of the wear of the grinding wheel is controlled by reducing said grinding current when the value of the detected grinding current is larger than the preset value of grinding current, and by increasing said grinding current when the value Of the detected grinding current is smaller than the preset value of grinding current, whereby resilient deformations of the grinding wheel, the grinding wheel carriage and the material to be ground are compensated.
Claim 12
Dependent Claim
309 words
An automatic grinding apparatus for use in a traverse grinding work of a roll grinding machine comprising: a first electric motor for driving a grinding wheel; a second electric motor for giving an in-feed to said grinding wheel; means for controlling the grinding current of said first electric motor so that said grinding current becomes equal to a predetermined grinding current; means for detecting said grinding current; means for comparing a value of the detected grinding current with a preset value of grinding current; means for controlling the rotating speed of said second electric motor so that said rotating speed is increased when the difference between both values of grinding current is within a predetermined range and the value of the detected grinding current is larger than the preset value of grinding current, and so that said rotating speed is reduced when the difference between said both values is within the predetermined range and the value of the detected grinding current is smaller than the preset value of grinding current; means for differentiating the value of the detected grinding current with respect to time; means for controlling the in-feed speed of the grinding wheel by controlling the rotating speed of said second electric motor so that the in-feed speed of the grinding wheel is proportional to an output of the differentiated grinding current; and means for controlling said grinding current so that the rate of compensation of the wear of the grinding wheel is controlled by reducing said grinding current when the value of the detected grinding current is larger than the preset value of grinding current, and by increasing said grinding current when the value Of the detected grinding current is smaller than the preset value of grinding current, whereby resilient deformations of the grinding wheel, the grinding wheel carriage and the material to be ground are compensated.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |