Through Hole Drilling of Alumina Ceramic with Electroplated Diamond Tool (1st Report)

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  • 小径ダイヤモンド電着工具によるアルミナセラミックへの通し穴加工 (第1報)
  • 小径ダイヤモンド電着工具によるアルミナセラミックへの通し穴加工(第1報)工具形状と加工条件の検討
  • ショウケイ ダイヤモンド デンチャク コウグ ニ ヨル アルミナセラミック エ ノ トオシ アナカコウ ダイ1ポウ コウグ ケイジョウ ト カコウ ジョウケン ノ ケントウ
  • —Investigation of Tool Geometry and Machining Conditions—
  • ―工具形状と加工条件の検討―

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In through hole drilling of hard and brittle materials such as ceramics, glass etc., cracks occur at the exit surface. This paper deals with a miniature drilling of Al2O3 (1600HV) using an electroplated diamond tool. The main purpose of this research is to find out tool geometries and drilling conditions in which the exit cracks are very small and the tool life is very long. A tool with rectangle section and bowl end is effective on the chip removal and the control of fracture size. A method assisted by step feed, in addition, produces a numerous drilling number of 100th or more at a workpiece with a thickness of 3.4mm. The desirable drilling speed should be 50-100m/min and the preferable feed rate arrangement should be 5mm/min at the entrance while 1.5mm/min at the exit. When the tool end reaches the position about 40μm from the exit surface, a hole passes through and large cracks occur around the hole. At the same time, the thrust force falls rapidly. As the tool end moves further, the hole diameter increases and the fracture size decreases. However, large cracks may occur rarely in the progressive process.

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