ABNORMALITY SIGN DETECTION SYSTEM AND METHOD

• Main Authors: MACHIDA SHUNTARO, FUJIYAMA YASUHIRO, HASEGAWA HIROAKI, TAKEZAKI TAICHI, OTSU KENJI, MATSUI RYOHEI
• Format: Patent
• Language: English; Japanese
• Published: 05.11.2020
• Subjects: COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; MEASURING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PERFORMING OPERATIONS; PHYSICS; REGULATING; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; TRANSPORTING

To provide technology for detecting an abnormality sign in machine tools with high sensitivity.SOLUTION: An abnormality sign detection system is a system for detecting an abnormality sign in a machine tool 1 having a rotating tool 3, and comprises: an AE sensor 2 installed in the machine tool 1 or a work 4; a signal processing circuit obtaining an AE signal from the AE sensor 2; an AE event detection circuit detecting AE events from the AE signals; an AE event rate calculation circuit calculating an AE event rate that is the number of AE events per unit time by using the AE events; a determination circuit determining whether a plurality of index values arranged in a time series have reached a first state in which they are continuous for the first consecutive number of times or more within a first range, and if so, detecting as an abnormality sign; and an output control circuit performing, when the abnormality sign is detected, output control including an alert output indicating the abnormality sign or processing operation stop.SELECTED DRAWING: Figure 1 【課題】工作機械における異常予兆を高感度に検知できる技術を提供する。【解決手段】異常予兆検知システムは、回転する工具３を有する工作機械１における異常予兆を検知するシステムであって、工作機械１またはワーク４に設置されているＡＥセンサ２と、ＡＥセンサ２からのＡＥ信号を取得する信号処理回路と、ＡＥ信号からＡＥイベントを検出するＡＥイベント検出回路と、ＡＥイベントを用いて、単位時間あたりのＡＥイベント数であるＡＥイベントレートを計算するＡＥイベントレート計算回路と、時系列上に並ぶ複数の指標値が、第１範囲内で第１連続回数以上で連続している第１状態になったかどうかを判定し、第１状態になった場合には異常予兆として検知する判定回路と、異常予兆を検知した場合に、異常予兆を表すアラート出力または加工動作停止を含む出力制御を行う出力制御回路と、を備える。【選択図】図１