Characteristics of Magnetic Polishing with Magnetic Abrasive Powder Fabricated by Plasma Melting Method

플라즈마 용융법으로 제조된 Fe계 자성분말의 자기연마 특성

  • 이영란 (경상대학교 재료공학부 생산기술연구소) ;
  • 배승열 (경상대학교 재료공학부 생산기술연구소) ;
  • 안인섭 (경상대학교 재료공학부 생산기술연구소) ;
  • 이용철 (연암공업대학 정밀기계과)
  • Published : 2001.03.01

Abstract

Most of mold manufacturing procedures have been automated by the introduction of NC machine tool and CAD/CAM system. But the three-dimensional surface curvature of the mold must be done by hand work of well-skilled workers. Magnetic abrasive polishing powders were investigated for surface polishing for 3D curvature. This study aims to investigate homogeneously distributed hard phase in Fe matrix and strong bonding between Fe-matrix and hard phase. The NbC powder, $B_4C$ powder and $Al_2O_3$ powder were mixed in Fe-matrix respectively. Mixed Fe-hard phase powders were compacted by press and then these were melted by plasma melting. According to SEM, XRD and OM observation, Fe-NbC magnetic abrsive powder had the most homogeneous distribution and strong bonding. As a result of magnetic polishing, the surface roughness before magnetic polishing, 1 ${\mu}m$ $R_{max}$, was reduced to 0.2 ${\mu}m$ $R_{max}$ over the entire inner surface of the tube.

Keywords

References

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