| Summary: | 碩士 === 國立中興大學 === 機械工程研究所 === 83 ===
The basic requirements of Flexible Manufacturing System (FMS) are the continuance of automated manufacturing processes. In automated manufacturing processes, there are many factors, such as equipment layout, quality control and measurement, information collection and on-line monitoring, and the computer control management, that influence the quality of entire systems. In FMS, there are many cutting tools that used in machining for different parts. Since tool wear is a complicate phenomenon, the change of cutting conditions, such as surface cutting speed, feedrate, depth of cut, and tool material, will make different tool status. Therefore, it is not reasonable with time accumulation to predict tool wear would increase the production cost.
Tool wear may be described by different equations that are also derived by off-line measurement. With tool wear generate, cutting force become increase. Model-based indirect tool wear measuring techniques are most suitable for on-line tool wear assessment. A comprehensive physical model that relates the flank wear to the change of the cutting force is proposed. This model takes the tool geometry of a practical turning operation into consideration. the model was tested and the experimental results support the proposed theory. In this paper, we analyze the cutting force signal and derived system model with real cutting condition then bring up two methods that can monitor tool wear status and predetermine the time to change the cutting tool.
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