• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.10a
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• pp.95-100
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• 1993

본 연구에서는 볼 엔드밀을 사용한 5축 가공에서 공구 간섭회피를 위한 효율적인 알고리즘과 가공 가능한 많은 자세들 중에서 공구 절삭부위와 이전자세를 고려한 공구 자세설정 알고리즘을 개발 하였다. 공구 간섭검사는 공구 밑면 간섭과 몸체 간섭으로 나누어 순차적으로 수행하고, 공구 몸채 간섭이 없는 공구 자세를 설정한다. 공구 몸체 간섭검사는 곡면의 다각형 모델과 공구 축과의 관계를 사용하여 행한다. 간섭이 발생하였을 경우 간섭회피 및 자세조정 영역으로 설정하고 유효한 공구자세의 범위를 정한 후, 이 범위 내에서 공구 절삭 부위 및 이전 자세를 고려한 효율적 공구자세를 사용하여 공구경로를 산출하였으며, 시뮬레이터를 통해 그 유효성을 검증하였다.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.10
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• pp.45-52
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• 1999

The online realtime positioning error compensation system 'SKY-PACS' is developed to correct geometric errors, thermal errors and tool deflection errors induced by cutting forces on the vertical machining center. 'SKY-PACS' communicates position commands and position compensation signals with the CNC controller at 100Hz, which is CNC control frequency. So the compensation procedure can be applied during axis movement. Using 'SKY-PACS', Maximum 1 axis positioning accuracy was corrected from 5{\mu}m$ to 2{\mu}m$and the squareness error of X-Y table was corrected from 51{\mu}m$/m to below 4{\mu}m$/m. The error compensation under the cutting condition is carried out by ISO10791-7. And the measurement of test-pieces shows that the roundness is corrected rom 8{\mu}m$ to below 5{\mu}m$.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04b
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• pp.97-101
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• 1995

This paper describes a new surface finishing process which uses magnetic abrasive polishing. This is applied to automatic finishing of die & mold surface. Nowadays, most of die & mold meanufaturing procedures have been automated by the introduction of NC machine tool and CAD/CAM system. But the surface finishing of die & mold must be done by hand work of well-skilled workers. Though many attempts were tried in the past 15 years to eliminate this hand work, the automatic finishing of die & mold surface with 3D curvature has not been achieved yet. New magnetic abrasive finishing process is thought as one of the possible methods for the automation of 3D surface finishing. In order to improve the grindability of the method, ultra-high speed and 5-axis machining was introduce. The magnetic abrasive polishing which has adopted these methods was confirmend to improve the efficiencyof die & mold surface finishing.