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Conical hole bottom punched construction method, interposition tool null of conical die deformation gauge and conical die deformation
Conical hole bottom punched construction method, interposition tool null of conical die deformation gauge and conical die deformation
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机译：圆锥孔底冲孔施工方法，圆锥模变形量规的插补工具和圆锥模变形
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摘要
PURPOSE: To bore a boring hole bottom into a conical shape at the concentric position of a boring hole with a combination tool of a double-tube barrel bit. ;CONSTITUTION: A cylindrical core barrel bit 3 with a required outer diameter is fitted at the tip of a core tube 1, and boring is performed to the preset position. The core barrel bit 3 and a core barrel bit 4 with a diameter smaller than that of the core barrel bit 3 are concentrically protruded via a coupling 2 to form a combination bit, and a boring hole bottom is bored to the preset position. A pilot bit with the same diameter as that of the small-diameter core barrel bit 4 is used in place of the small-diameter core barrel bit 4, and it is concentrically protruded and fitted to the coupling 2 to form a coupling bit, and the hole bottom is bored to the preset position. A taper bit 6 with the same diameter as that of the small-diameter core barrel bit at the large- diameter portion is used in place of the pilot bit, it is concentrically protruded and fitted to the coupling 2 to form a combination bit, the hole bottom is bored to the preset position, and the hole bottom is bored into a conical shape.;COPYRIGHT: (C)1993,JPO&Japio
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