• Title/Summary/Keyword: 삽입재 크기

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Performance estimation depending on the insert size of conical picks by linear cutting test (선형절삭시험에 의한 코니컬커터의 삽입재 크기에 따른 절삭성능 평가)

  • Choi, Soon-Wook;Kang, Tae-Ho;Chang, Soo-Ho;Lee, Cheol-Ho;Lee, Gyu-Phil;Kim, Chang-Yong
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.18 no.2
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    • pp.221-233
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    • 2016
  • In order to estimate the performance of a conical cutter depending on the insert size, this study measured forces acting on conical cutters with different cutter spacings, penetration depths and skew angles using slim and heavy conical cutters. When cutter spacings ranged from 12 to 27 mm, the deviations of mean cutter forces with cutter depths appeared smaller compared to other cutter spacings. When skew angle is $0^{\circ}$, the optimal S/d ratio was obtained in the range of 4 to 4.5 for which specific energy of cutting was minimized. It were usually found in the range of 1 to 5. However, when skew angle is $6^{\circ}$, the optimal S/d ratio was obtained in the range of 1 to 3. The simple comparison results shows that the performance of slim cutter was superior to that of heavy cutter, but the use of heavy cutter can be effective, considering the cutter consumption and cutter damage when the strength of the ground is high enough.

Durability evaluation depending on the insert size of conical Picks by the field test (삽입재 크기에 따른 코니컬 커터의 현장 내구성 평가 연구)

  • Choi, Soon-Wook
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.21 no.1
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    • pp.49-59
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    • 2019
  • In this study, the durability of conical pick cutter was compared and analyzed by pre- and post-test visual inspection, measurement of weight loss and wear volume through field test on two types of conical pick cutters applied to rotary drum cutter. In the visual inspection, it was found that only 9 inserts were lost in the slim type conical pick cutter. This result show that the thickness of the head cover surrounding a insert was important to maintain the insert during excavation. The weight loss and wear volume of the heavy type conical pick cutter were less than half that of the slim type. From these results, it can be confirmed that heavy type is more useful than slim type in hard rock. It should be noted that, when determining the wear loss of the conical pick cutter, the mutual comparison of the weight measurement and the wear volume measurement results may be different due to the unit weight of the material and the spalling caused by excavation.