US 12,434,343 B2
Calibration-based tool condition monitoring system for repetitive machining operations
Rui Liu, Pittsford, NY (US)
Assigned to Rochester Institute of Technology, Rochester, NY (US)
Appl. No. 17/291,783
Filed by Rui Liu, Pittsford, NY (US)
PCT Filed Nov. 6, 2019, PCT No. PCT/US2019/060076
§ 371(c)(1), (2) Date May 6, 2021,
PCT Pub. No. WO2020/097208, PCT Pub. Date May 14, 2020.
Claims priority of provisional application 62/756,125, filed on Nov. 6, 2018.
Prior Publication US 2022/0009049 A1, Jan. 13, 2022
Int. Cl. B23Q 17/09 (2006.01); G05B 19/4065 (2006.01)
CPC B23Q 17/0961 (2013.01) [B23Q 17/0995 (2013.01); G05B 19/4065 (2013.01); G05B 2219/37233 (2013.01); G05B 2219/37252 (2013.01); G05B 2219/37256 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for tool condition monitoring, comprising:
calibrating reference signals for different tool conditions for a machine system comprising a machine, tool, workpiece and monitoring device comprising a sensory system and control software, by
installing a first reference tool in the machine to operate on a first workpiece,
operating a repetitive machining operation on the first workpiece with the first reference tool under production conditions, whereby the first reference tool degrades,
collecting at least one reference signal relating to a condition of the first reference tool generated by the sensory system while monitoring the first reference tool,
installing a second reference tool in the machine to operate on a second workpiece,
operating the repetitive machining operation on the second workpiece with the second reference tool under production conditions, whereby the second reference tool degrades,
collecting at least one reference signal relating to the condition of the second reference tool generated by the sensory system while monitoring the second reference tool, and
processing the collected at least one reference signals with control software to provide reference signals corresponding to specific reference tool conditions according to a calibration procedure;
following the calibration of the reference signals for specific tool conditions, operating the repetitive machining operation on a third workpiece with a working tool under production conditions, whereby the working tool degrades;
collecting at least one working signal relating to the condition of the working tool generated by the sensory system from monitoring tool conditions of the working tool; and
processing and analyzing the collected at least one working signal with control software to provide a similarity analysis between the reference signals and the working signals to identify in real-time a status of the working tool condition.