岩石に対するビットの圧入に関する研究

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タイトル別名
  • Indentation of Bit into Rock by Dynamic and Static Force
  • ガンセキ ニ タイスル ビット ノ アツニュウ ニ カンスル ケンキュウ

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This study is a part of series which is carried on with the hope that if they can clear controversial question, i. e., mechanism of rotary and percussive drilling, and can get some idea needed when we come to choice between rotary and percussive drilling for particular rock formation.<BR>Special test apparatus was designed for studies on indentation of bit under dynamic force.<BR>This comprises of mechanical part, anvil, hammer and bit, and electronic measurering apparatus.<BR>Indentation depth of bit and dynamic force on bit are measured by means of electric capacitance and wire strain gage respectively which are displayed on the dual beam Braun tube oscillogragh.<BR>Instrument used for static test is conventional Brinell hardness tester except ball which is replaced by test bit.<BR>Caluculating dynamic and static energy, needed to get certain depth of penetration, from the force and penetration measured, it is known that fewer energy is necessary to get same penetration, if dynamic force is applied, compared with static force for hard rock formation, and vice versa for soft rock formation.<BR>Although authors must admit that there are various other factors, this result implies big suggession for us to chose between rotary and percussive drilling for certain rock formation to get more hole for cost.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 74 (846), 989-995, 1958

    一般社団法人 資源・素材学会

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