| 摘要 |
An insert of an indexable drill is provided to reduce a back pressure by decreasing a diameter of a web blade and enhance a cutting force by increasing a length of a main cutting blade. In an insert of an indexable drill, a web blade(54) is formed symmetrically centered on a center vertex(52). A main cutting blade(56) is elongated radially from the web blade. A boundary edge(62) is formed between a helix curved surface(58) which contains the main cutting blade and a coupling side surface(60) which has a tightening bolt hole(64). The insert of an indexable drill features a relatively increased length of the main cutting blade(S3) and a relatively decreased diameter of the web blade by forming an upper web diameter shorter than a bottom web diameter.
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