AFM 測定法에 의한 超精密 加工面의 特性 硏究

Abstract

Recently, ultra-precision machining technology has been developed competitively in the advanced countries for high precision mechanical components. Now they have inquired into high technology for acquiring machining quality such as surface roughness with nano-meter degree to produce high priced parts. In this study, paper aims to evaluate characteristics of machined surface using surface roughness tester and atomic force microscope in the ultra-precision cutting of aluminum alloy and brass material by diamond tool. For the purpose of this experiment, specimens were lathed each 10 pieces per 50 ㎞ for total 500 ㎞ with dry cutting. These results will be contributed to ultra-precision machining by foundation data of surface roughness and tool wear when parts are cutting with diamond tool at the factory. The results obtained by experimental study are summarized as follows; (1) At the result of experiment, roughness value was verified the theory "will be obtain a best data at the highest speed and lowest feed" but It was not influenced on roughness below 5 ㎛ cutting depth. (2) Nose radius of the cutting tool was changed to smaller than 1 ㎛ within 500 ㎞ cutting length but tool wear and deformation was not occurred. (3) The result of surface roughness was not good with diamond new tool at the initial cutting and the machinability of aluminum alloy was better than brass. Those variations are 0.108 ㎛ aluminum alloy and 0.161 ㎛ brass within 500 ㎞ cutting length. (4) Observed results of surface finish characteristics through AFM, the formation of track according to cutting speed was observed to be uniform but additional small track occurred within the regular track on the machined surface was checked out. It is main factor influencing surface roughness. (5) Evaluation of surface finish characteristics through AFM added more information to results of roughness tester but several influences of cutting condition that are machine vibration, strength, coolant etc. will be studied continuously for obtaining accurate results.