난삭재에 대한 드릴 가공 시 이론적 표면 거칠기와 실제 표면 거칠기 간의 상관관계 분석

Abstract

Although many difficult-to-cut materials are being developed, their mechanical machining is becoming increasinglydifficult. To determine the cutting conditions required by these newly developed materials, their machinability has tobe determined. To save time and cost, machinability evaluation of the materials has to be simplified. If the surfaceroughness of a material, a factor that can be used to evaluate the machinability of the material, could be calculatedwithout determining it through experiments, machinability evaluation of the material can be simplified. In this study,a comparative analysis of the theoretical and measured surface roughness values of two types of difficult-to-cutmaterials, with two commercially available materials coming under each type, subjected to drilling was performed. Through tool wear monitoring , surface roughness distortion due to tool wear during drilling was prevented. Acomparison and analysis of the theoretical values of the surface roughness of the materials derived from the formulasdeveloped in this study and the measured surface roughness values of the materials, indicated that the ratios of thetheoretical and measured values were almost same with only slight differences that depended on the mechanicalproperties of the materials.