COBEM99

S19 Usinagem dos Materiais

Title:

TOOL WEAR MONITORING UNDER PRACTICAL CONDITIONS

Summary :

TOOL WEAR MONITORING UNDER PRACTICAL CONDITIONS SUMMARY. SEVERAL WORKS HAVE BEEN PRESENTED ABOUT TOOL WEAR MONITORING SYSTEMS (TWMS) USING ARTIFICIAL NEURAL NETWORKS(ANN), FED WITH MEASUREMENTS FROM SENSORS. THEY SHOW GOOD RESULTS FOR DETECTING WHETHER THE TOOL IS FRESH OR WORN. IN MOST OF THESE WORKS THE TESTS WERE CARRIED OUT FOR ONE TYPE OF TOOL (USUALLY UNCOATED AND WITH A FLAT RAKE FACE) ARTIFICIALLY WORN, ONE TYPE OF WORKPIECE MATERIAL AND UNDER A NARROW RANGE OF CUTTING CONDITIONS. ALTHOUGH THESE RESULTS ARE IMPORTANT, THEY CANNOT BE ACCEPTED AS BEING GOOD IN PRACTICAL SITUATIONS, WHERE COATED TOOLS WITH CHIP BREAKERS AND DIFFERENT MATERIALS ARE FREQUENTLY USED. THE PRESENT WORK REPORTS THE RESULTS OF RESEARCH TO BUILD A TWMS FOR TWO TYPES OF TOOLS AND TWO DIFFERENT MATERIALS. DURING THE TESTS FOR DATA ACQUISITION THE TOOLS WERE CONTINUALLY USED IN A TURNING OPERATION. BEFORE INTERRUPTIONS TO OBSERVE THE STAGE OF WEAR OF THE TOOL, MEASUREMENTS OF FORCE AND ACCELERATION WERE UNDERTAKEN. THE DATA OBTAINED WERE USED TO TRAIN AND TO TEST THE ANNS. THE RESULTS SUGGEST THAT FOR A TWMS TO WORK SUCCESSFULLY IN PRACTICAL SITUATIONS, IT MUST HAVE A CHARACTERISTIC DESIGN DIFFERENT FROM THOSE DEVELOPED TO BE USED FOR ONE TYPE OF TOOL AND ONE TYPE OF MATERIAL. KEYWORDS: TOOL WEAR MONITORING, TOOL MONITORING, TOOL WEAR

Author :

Barrow, George 0
Canabrava Filho, José Stockler

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