• Title/Summary/Keyword: 보링

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Influence of Chucking Forces upon the Accuracy of Circular Hole in Boring Process on the Turning (선반으로 보링가공 할 때 척킹력이 가공 정도에 미치는 영향)

  • Lee, Sang-Soo;Kang, Shin-Gil;Jeon, Young-Seog
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.2
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    • pp.58-64
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    • 2008

  • The cutting process of materials is accompanied with the elastic and plastic deformation due to chucking forces in the boring process of thin holes on the turning. Upon removal of chucking forces at the end of process, the original shape is remained in the plastic deformation; on the other hand, it is modified in the elastic deformation due to spring back. Fixing materials by chucks on the turning has influence on roundness because the process is conducted with unbalanced distribution load induced from the fixing of three jaws. Moreover, the amount of spring back depends on the magnitude of fixing forces. We studied the change of roundness according to fixing forces as well as the method to reduce the influence of chucking forces.

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Application of Rockmass Prediction System during tunnel excavation(Sol-An Tunnel) (터널 굴착시 암반예측시스템 적용사례 (솔안터널))

  • 김용일;조상국;양종화;김장수;이내용
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • 2003.03a
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    • pp.13-30
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    • 2003

  • In this paper, a new systematic method will be introduced, in which a Rock-mass Prediction System(RPS) predicts the geological conditions and rock mass movements before tunnel excavation and the appropriate counter-measures are taken in the expected weak zones during tunnel construction. The Rock-mass Prediction System(RPS) consists of the LIM, a horizontal core drilling and a seismic exploration method(TSP/HSP). In the Rock-mass Prediction System(RPS), the seismic exploration method (TSP/HSP) gives information on the locations of the weak zones such as major faults and voids in wide-range, and the horizontal core drillings are utilized to find exact location and widths of the faults or voids near the weak zones which was predicted by the seismic exploration method (TSP/HSP). The LIM is used to find the hardness of the rock mass and small weak zones near the excavation face. The Rock-mass Prediction System (RPS) was successfully applied to the Sol-An Tunnel and the effectiveness of the system was verified.

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