중합로용 Impeller 제작을 위한 비자성 SUS316 재료의 자기연마가공 특성평가

Abstract

본 연구에서는 SUS316재질의 가공특성을 알아보기 위해 MAP(자기연마장치)를 이용하여 평면가공 시 많은 영향력을 미치는 인자를 알아보았고, 또한 실험계획법을 이용하여 실제 가공 시 영향을 많이 미치는 가공인자를 선정하였으며, 이상의 실험과 분석을 통해 다음과 같은 결론을 얻었다. 1. 전류의 세기가 실험결과에 영향을 가장 적게 미치는 것을 알 수가 있었으며, 자기력의 세기를 증가시키기 위한 영구자석은 실험결과에 가장 큰 영향을 미쳤음을 알 수가 있었다. 2. 회전속도가 1500rpm, 연구자석의 개수가 7개(82mT), 전류의 세기가 1.5A,공구와 공작물 사이의 거리가 1.5mm일 때 가장 좋은 표면거칠기를 얻을 수 있음을 알 수가 있었다(A3B3C1D2). 3. 예측값과 측정값을 비교하기 위해 최적조건(A3B3C1D2)을 적용하여 실시한 실험에서 예측값과 측정값을 비교해 보았을때, 측정값이 1차반응표면모델의 예측값과 유사하게 나오는 것을 알 수가 있었다.

Nowadays, the stainless steel has widely used in the industries such as building facades, pans and cookware, chemical and petro-chemical plant, components for automotive and aero engines. Stainless steel was invented early in the 20th century when it was discovered that a certain amount of the metal chromium added to ordinary steel gave it a bright shiny gloss and made it highly resistant to tarnishing and rusting. To verify the SUS316 material's processing assessment carried out using the map machine. Also, this experiment to know the surface roughness improved the SUS316 plane and SUS316 processing character used design of experiments. Parameters were considered such as rotational speed, magnetic flux density, current and working gap between the workpiece and the solid tool. In this study, the MAP process was adopted for getting better results in the SUS316 of non ferromagnetic materials. From this preliminary experimentation, a control scheme of the MAP process for the complicated workpiece profile was accomplished. The design of experimental method was adopted during the experiments for evaluating the effect of the parameters on the polishing results. The obtained results were as follows. 1. Currents have not affected the experimental results but permanent magnet have heavily affected which improve the magnetic flux density. 2. The optimal condition was chosen at the rotational speed 1500rpm, the permanent magnet 7(82mT), current 1.5A and the working gab 1.5mm. 3. To compare with predicted value and measured value, The experiment applied with the optimal condition and then the result was similar to the first-order value.