JPH0347712U - - Google Patents

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Publication number
JPH0347712U
JPH0347712U JP10869289U JP10869289U JPH0347712U JP H0347712 U JPH0347712 U JP H0347712U JP 10869289 U JP10869289 U JP 10869289U JP 10869289 U JP10869289 U JP 10869289U JP H0347712 U JPH0347712 U JP H0347712U
Authority
JP
Japan
Prior art keywords
drill
drill diameter
cutting edge
tip
curvature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10869289U
Other languages
English (en)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP10869289U priority Critical patent/JPH0347712U/ja
Publication of JPH0347712U publication Critical patent/JPH0347712U/ja
Pending legal-status Critical Current

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  • Drilling Tools (AREA)

Description

【図面の簡単な説明】
第1図は、本考案に係るドリルの一実施例を示
す図であり、先端切刃形状を軸方向先端側から見
て示す図である。第2図は心厚寸法のみを変化さ
せてドリルの寿命テストを行つた結果を示すグラ
フ図、第3図は心厚寸法を0.45Dとして主切
刃の曲率半径のみを変化させてドリルの寿命テス
トを行つた結果を示すグラフ図である。 1……主切刃、2……2次切刃、D……ドリル
径寸法、W……心厚寸法。

Claims (1)

  1. 【実用新案登録請求の範囲】 心厚寸法Wがドリル径寸法Dの0.3〜0.6
    倍の範囲内に設定され、 軸方向先端側から見た主切刃1の形状は、径方
    向のその中央部が切削回転方向へ突出するように
    凸湾曲し、 上記主切刃1の形状の曲率半径がドリル径寸法
    Dの0.55〜1.0倍の範囲内に設定され、 心厚先端部にX型シンニングが施されたことを
    特徴とするドリル。
JP10869289U 1989-09-18 1989-09-18 Pending JPH0347712U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10869289U JPH0347712U (ja) 1989-09-18 1989-09-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10869289U JPH0347712U (ja) 1989-09-18 1989-09-18

Publications (1)

Publication Number Publication Date
JPH0347712U true JPH0347712U (ja) 1991-05-07

Family

ID=31657316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10869289U Pending JPH0347712U (ja) 1989-09-18 1989-09-18

Country Status (1)

Country Link
JP (1) JPH0347712U (ja)

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