A health assessment method, system, and assessment terminal for key components and complete machines of CNC machine tools

Abstract

The present invention provides a health assessment method for key components of a CNC machine tool and a complete machine, a system and an assessment terminal, including a data acquisition and preprocessing module, a sample working condition identification module, a health index fusion module, an evaluation index mapping module, and a baseline value Construction and key component relative evaluation module and overall machine health evaluation module; based on the cooperation between the above modules, and through the analysis of the redundancy, relevance, sensitivity and stability of the measurement point information, sensor selection and layout optimization are realized , to obtain the sensing information of the CNC machine tool and evaluate it. It can also integrate the trend characteristics of CNC machine tools, reflect the evaluation indicators of the degradation status of CNC machine tools in their entire life cycle, and effectively improve the weight imbalance of front and rear time series information caused by too long input information cycle, and improve and enhance the accuracy of health assessment. The invention also establishes a baseline value to perform health assessment, thereby improving the accuracy of health assessment of key components of the numerical control machine tool and the whole machine.

Description

technical field [0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a key component of a numerically controlled machine tool and a health assessment method for the complete machine, a terminal and a readable storage medium. Background technique [0002] Numerical control machine tool (Computer numerical control machine tools), referred to as "CNC machine tool", is an automatic machine tool equipped with a program control system. The control system can logically process programs with control codes or other symbolic instructions, decode them, express them in coded numbers, and input them into the numerical control device through the information carrier. After calculation and processing, various control signals are sent by the numerical control device to control the movement of the machine tool, and the parts are automatically processed according to the shape and size required by the drawing. The emergence of CNC machin...

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Problems solved by technology

[0004] First of all, the state monitoring process of CNC machine tools is greatly affected by the coupling of working conditions, and the information collected by sensors is quite different under different working conditions. It is difficult to accurately evaluate the current state of the equipment, and the model identification effect is limited.

[0005] Secondly, for the collected vibration, temperature, current and other CNC machine tool information, the traditional data-driven health assessment model ignores the timing characteristics, cannot capture the time-varying information, and cannot accurately evaluate the state of the machine tool

[0006] Finally, the state monitoring process of CNC machine tools in the past often only carried out state monitoring on sensor information dimensions such as vibration, temperature, and noise, ignoring the representation of machining accuracy and machining efficiency in the health assessment of machine tools, and could not fully reflect the health of CNC machine tools

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