COBEM99

S19 Usinagem dos Materiais

Title:

BEHAVIOR OF THE RATE OF REMOVAL AND SUPERFICIAL ROUGHNESS IN PLANE LAPPING UNDER DIFFERENT PARAMETERS OF THE PROCESS

Summary :

THIS WORKS PRESENTS A STUDY OF THE INFLUENCE OF SOME PARAMETERS OF THE LAPPING PROCESS ABOUT THE SUPERFICIAL FINISHING OF HARDENED AND SOFT WORKPIECES. FOUR SPECIMENS TYPES WERE USED IN A STEEL ABNT 4140 UNDER DIFFERENT THERMAL TREATMENTS.THEY ARE LAPPED USING AS ABRASIVE THE OXIDE OF ALUMINIUM 800 MESH. IN THE EXPERIMENT SETTLED TWO DIFFERENT CONDITIONS: FIRST, JUST AS USUALLY PRACTICED IN THE INDUSTRY, IT WAS ADDED LAPPING FLUID CONTINUALLY ALONG THE PROCESS BEING MEASURED THE ROUGHNESS AND THE THICKNESS OF THE WORKPIECE IN INTERVALS OF 10, 30 AND 60 MINUTES. AFTER, IN A SECOND PROCEDURE, LAPPING FLUID WAS ONLY PLACED IN THE BEGINNING OF THE PERIODS. EACH PERIOD UNDERSTOOD 10 MINUTES OF LAPPING, 2.5 MINUTES TO EACH SESSION AND IT WAS TAKEN THE REMOVAL MEASURES AND ROUGHNESS OF THE WORKPIECE. BESIDES, IT WAS USED TWO DIFFERENT CINEMATIC CONDITIONS: FIRST, WITH THE PIECES MAINTAINED ON A SAME STRIP OF THE LAPPING DISK; AND OTHER, VARYING THE RELATIVE POSITION OF THE WORKPIECES IN THE DISK. AS RESULT WAS VERIFIED THAT THE TIME OF LAPPING, THE CINEMATIC CONDITION, AND THE DIFFERENT MECHANISMS OF REMOVAL OF THE MATERIALS EXERCISE DECISIVE INFLUENCE ON THE PROCESS. KEYWORDS: LAPPING, ABRASIVE, ROUGHNESS, MATERIAL REMOVAL

Author :

Losnak, Célio 0
Perez, Fabiano Ricardo
Sanchez, Luiz Eduardo

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