Adaptive control of cutting machining operations
First Claim
1. A method of adaptive control of cutting machine operations to optimize the productivity of cutting machine means including at least one cutting tool and having controllable cutting parameters affecting its cutting tool comprising the steps of:
- a. selecting a first set of cutting parameters,b. performing a machine operation using said first set of cutting parameters,c. during said machining operation measuring a plurality of times the magnitude of at least one wear-related parameter of the cutting tool,d. comparing the successive measurements of said at least one wear parameter,e. calculating the tool life by projecting, based on said comparison step, when said wear parameter will reach a predetermined limiting value,f. calculating productivity based on said first set of cutting parameters and the tool life calculated in said tool life calculating step,g. optimizing productivity by selecting further sets of said cutting parameters, and calculating for each set the corresponding tool life, and the productivity resulting from said further sets of cutting parameters and said corresponding tool life,h. selecting from the optimized productivity value the desired set of cutting parameters.
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Abstract
For adaptive control of cutting machining operations, measured quantities characterizing optimized productivity are utilized. These quantities are connected with the wear of the tool and with the wearing rate. To measure the wear, the face wear (also called crater wear) of the tool, its flank wear and its minor-flank wear are used. Other parameters used are: the dimensions of the workpiece, its vibrations, its deflection, its surface roughness, cutting force, and cutting power. In a calculating unit, the shortest time is calculated until a given wearing criterium is reached. This time, and cost constants for the machining process, are fed into a control unit for calculating the optimized (maximum) productivity, and for performing the machining operation with cutting parameters kept within predetermined values. Machining is interrupted for tool changing when one of said wearing criteria is reached.
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Citations
28 Claims
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1. A method of adaptive control of cutting machine operations to optimize the productivity of cutting machine means including at least one cutting tool and having controllable cutting parameters affecting its cutting tool comprising the steps of:
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a. selecting a first set of cutting parameters, b. performing a machine operation using said first set of cutting parameters, c. during said machining operation measuring a plurality of times the magnitude of at least one wear-related parameter of the cutting tool, d. comparing the successive measurements of said at least one wear parameter, e. calculating the tool life by projecting, based on said comparison step, when said wear parameter will reach a predetermined limiting value, f. calculating productivity based on said first set of cutting parameters and the tool life calculated in said tool life calculating step, g. optimizing productivity by selecting further sets of said cutting parameters, and calculating for each set the corresponding tool life, and the productivity resulting from said further sets of cutting parameters and said corresponding tool life, h. selecting from the optimized productivity value the desired set of cutting parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of adaptive control of cutting machine operations for a cutting machine including at least one cutting tool and having controllable cutting parameters affecting its cutting tool comprising the steps of:
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a. storing for subsequent checking a predetermined relationship among said cutting parameters and tool lives based on said cutting parameters, b. selecting a first set of cutting parameters, c. performing a machining operation using said first set of cutting parameters, d. during said machining operation measuring a plurality of times the magnitude of at least one wear-related parameter of the cutting tool, e. comparing the successive measurements of said at least one wear parameter, f. calculating the tool life by projecting, based on said comparison effected in step (3) when said wear parameter will reach a predetermined limiting value, g. comparing the tool life as calculated in step (f) with the tool life obtained in accordance with the predetermined relationship obtained in accordance with step (a), h. carrying out the cutting operation using the cutting parameters based upon the predetermined relationship obtained in accordance with step (a) only provided that the tool life calculated in accordance with step (f) comes within a predetermined range of the tool life as provided by said predetermined relationship. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of adaptive control of cutting machine operations by in-process measurement for optimizing the productivity of the machine operation with cutting machine means having controllable machining parameters affecting a cutting tool, comprising the steps of:
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selecting a plurality of sets of machining parameters, and performing a machining operation with each said set of parameters, measuring a plurality of times at least one wear related parameter of the cutting tool as a result of each of said machining operations, projecting, based on the measured changes in said at least one wear related parameter, the machining life of the cutting tool until said wear related parameter exceeds a predetermined maximum based on one of said sets of machining operation parameters, and optimizing the productivity of said machining operations by using different ones of said sets of machining parameters.
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Specification