Analysis Of Coupling Characteristic For Milling Force Measurement Based On Octagonal Rings

Accurate measurement of cutting force is one of the key modern machining centers and intelligent automation, which is closely related to the cutting process parameters. Therefore, by cutting force we can accurately detect the change of real-time monitoring process status, and timely adjust machining parameters to accommodate the processing needs, so as to prevent damage to the security incidents and the damage of workpiece in processing. Currently, an increasing number of cutting force measurement systems have been developed, which the measurement structure varied. The octagonal ring, as a conversion elastomer of dynamometer, which is relatively easy to install and widely developed, has high sensitivity, usually, four octagonal rings are selected as a generally elastic member of force-measuring apparatus, and the four octagonal rings are placed pairwise in the same direction, the two octagonal rings which are disposed are ready for measuring the cutting force in the horizontal direction, therefore, When measuring the single milling component in horizontal direction, only the two octagonal rings in the same direction are used, while the other perpendicular two will interfere the octagonal rings, which is used for measuring the cutting force, so the coupling between the octagonal ring produce. Therefore, in order to measuring the cutting force accurately by taking advantage of the octagonal ring elastomer, it is necessary to analyze the coupling features between octagonal rings for obtaining a more accurate cutting force. This paper presents a milling force measurement system based on multi octagonal rings, and analyze the cross-coupling features between the octagonal rings though theoretical simulation experiments so as to verify the feasibility of the milling force measurement system.This paper first introduces the purpose and significance of the subject, summarizes the research status of cutting force measurement at home and abroad, lists several main cutting force measurements based on different sensors, and makes a concrete example and detailed analysis. Besides, it also describes the important of multi-axis force sensor for many areas and the research status of its coupling features and decoupling method. Therewith, the paper theoretically analyzes the mechanical properties of the ring for determining the pasting position of the fiber grating sensor, and then selects the appropriate octagonal ring size parameters and material parameters for the final designing of the entire structure of milling force measuring device and its construction mold. According to the theoretical analysis of octagonal ring elastomer, it introduces the pasting of fiber grating on octagonal ring and milling force measuring strain transfer principle. Afterwards the paper makes a preliminary theoretical coupling analysis for the octagonal ring structure, then Ansys simulation software is applied to make simulation analysis of octagonal ring and force measuring device for acquiring the degree of coupling between different directions octagonal ring, and then compared with the theoretical analysis. Followed experiments is done to analyze the strain characteristics octagonal ring, and the whole force measuring device characteristics, so as to obtain mathematical expressions of milling component measured value, after that, the measured value and the true value are compared for the analysis of the degree of coupling between the octagonal ring and the correction of mathematical expression of milling component, at last it proves the feasibility of the milling force measurement system. Finally, the research and the problems of this paper are summarized and discussed.