AE SIGNAL MONITORING SYSTEM FOR SURFACE DEFECTS AND TOOL CONDITIONS ON MANUFACTURING PROCESS

摘要

An acoustic signal analyzing system corresponding to surface defect and tool state in processing is provided to prevent defective goods by estimating tool replacement time from wear or breakage of a tool, and to reduce cost by extending a life span of the tool. An acoustic emission sensor is made of piezoelectric material, and composed of a sensor supporting bar with a thread. The acoustic emission sensor is mounted to a tool such as a bite. A processing state monitoring and estimating system(13) measures change of cutting resistance in processing by detecting acoustic emission signals with the bite attached to the acoustic emission sensor, and decides failure by estimating abnormal vibration of equipments and defect of a processed surface. A tool breakage monitoring and replacement time estimating system(14) detects a state of the tool by collecting data according to detection signals and deciding wear of the tool or breakage type of the tool with an RMS analyzer, and prevents processing failure from the broken tool by estimating breaking time of the tool.