| Inspection can help CNC machining center control the product processing quality.The level of inspection technology development has an great influence on the production efficiency of the manufacturing industry.With the rapid development of numerical control technology and computer control technology in the 21 st century,the on-line inspection technology has become a hot topic in current society.The advantages of on-line inspection are very obvious.It can avoid positioning errors of parts and the problems of the two times’ of clamping.At the same time,on-line inspection can reduce the time required for parts removal and handling,thereby improve the production efficiency of CNC machining center and shorten the production cycle required for the entire manufacturing process.Therefore,the research on the on-line inspection technology of CNC machine tools is of great significance in the development of the manufacturing industry.The research on the on-line inspection system of CNC machine tools is an indispensable important link in the actual inspection process.This paper mainly focuses on the following aspects: the key technology of CNC machine tool on-line inspection system and the separation technology of machining error.(1)For the problem of surface measurement point layout,three conventional measurement point arrangement methods are programmed in the UG software,which are equal parameter method,equal arc-length method and equal chord method.In order to ensure the accuracy of the inspection,to satisfy the surface inspection requirements to take fewer measurement points as much as possible and fully reflect the surface processing precision of high-efficiency inspection requirements,adaptive shape feature method is used.This idea is integrated into the program,and implement this function by writing corresponding software.(2)In order to improve the inspection efficiency of parts,the problem of the inspection path optimization of parts is studied.This paper analyzes the component parts of the inspection path of the surface parts,and use exhaustive search method and ant colony algorithm as the theoretical basis to write the program.In the UG software,the exhaustive search method and the ant colony algorithm path optimization module are programmed.(3)On-line inspection simulation system of CNC machine tools based on UG platform is studied.The programming of the probe user interface design and probe movement simulation in the on-line inspection simulation module of CNC machine tools is programmed.In order to enable the CNC machine tool to feedback the machining errors of the inspection parts in real time during the inspection process,the real-time display module of the machining errors of the online inspection system of the CNC machine tool is developed in UG software,and the processing error values of the parts are visually displayed in the inspection system,which can simplify subsequent processing of data,improve the overall efficiency of on-line inspection.(4)Through the modeling,processing and inspecting of the parts,the feasibility of the system functions such as measuring point arrangement,path optimization,probe movement simulation,inspection code generation,and real-time display of machining errors in the on-line inspection system of the CNC machine tool are verified.By comparing the on-line inspection data with the CMM off-line inspection data,the accuracy and effectiveness of the error compensation module of the on-line inspection system of CNC machine tool developed in this thesis is verified.(5)The process of errors caused by the error source and establish the error source model is studied.According to the principal component analysis principle,the number of sources of errors caused by machining errors is determined.Then,the data is processed according to the number of error sources.Using the independent component analysis principle to process the data,the estimation of different error sources is obtained,and the separation of processing errors is finally achieved. |
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