The machinability and residual stresses in facing of inconel 718

Abstract

<P>IN THE MANUFACTURE OF AEROSPACE COMPONENTS FROM NICKEL-BASED HEAT RESISTANT SUPER ALLOYS SUCH AS INCONEL 718, CHOOSING PROPER CUTTING TOOL AND CUTTING CONDITIONS FOR EACH OPERATION ARE VERY IMPORTANT FOR BOTH THE COMPONENT PRODUCTIVITY AND SURFACE INTEGRITY (QUALITY). DUE TO LACK OF PROPER UNDERSTANDING OF THE PERFORMANCE OF CUTTING TOOLS IN FACING OPERATION, THEY ARE OFTEN OPERATED UNDER LOWER PRODUCTIVITY AND QUALITY. TO ACHIEVE HIGHER PRODUCTIVITY AND GOOD SURFACE INTEGRITY, THIS RESEARCH FOCUSES ON THE FOLLOWING TWO ASPECTS: (1) ANALYSING THE PERFORMANCE OF ADVANCED CUTTING TOOLS SUCH AS THE PVD-TIALN, ALUMINA BASED CERAMIC AND CBN CUTTING TOOLS IN TERMS OF THEIR TOOL WEAR, WEAR MECHANISMS, TOOL LIFE, MATERIAL REMOVAL RATE AND SURFACE FINISH. (2) THE EFFECT OF CUTTING TOOLS AND CUTTING CONDITIONS ON THE SURFACE INTEGRITY (RESIDUAL STRESS AND SURFACE FINISH) OF THE MACHINED SURFACE. BEST CUTTING TOOL AND CUTTING CONDITIONS ARE PROPOSED FOR INCREASING PRODUCTIVITY AND SIMULTANEOU