JPS58184212U - gun drill - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来の実施例を示すガンドリルの側面図、第２
図は第１図のチップ部を示す側面拡大図、第３図は第１
図のチップ部の正面図、第４図は角度θを有する被削材
に穴あけ加工する場合の初期喰いつき状態を示す説明図
、□第５図は本考案による実施例を示すガンドリルの側
面図、第６図は第５図のチップ部を示す正面図、第７図
は本考案による他の実施例を示すガンドリルの側面図、
第８図は角度θを有する被削材に穴あけ加工する場合の
初期喰いつき状態を示す説明図そある。 図面中、１０はチップ部、１１は切刃、１２は油室、α
は逃げ角である。Figure 1 is a side view of a gun drill showing a conventional embodiment, Figure 2 is a side view of a gun drill showing a conventional embodiment;
The figure is an enlarged side view showing the chip part in Figure 1, and Figure 3 is an enlarged side view showing the chip part in Figure 1.
Figure 4 is an explanatory diagram showing the initial biting state when drilling a workpiece having an angle θ, Figure 5 is a side view of the gun drill showing an embodiment of the present invention. , FIG. 6 is a front view showing the tip portion of FIG. 5, and FIG. 7 is a side view of the gun drill showing another embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an initial biting state when drilling a hole in a workpiece having an angle θ. In the drawing, 10 is the tip part, 11 is the cutting blade, 12 is the oil chamber, α
is the clearance angle.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 切刃と油室を有するチップ部と、切屑排出溝を有する中
空シャンク部と、チャッキング用ドライバ部とからなる
ガンドリルにおいて、チップ部先端中央よりチップ部外
周端に直線状に形成される切刃の逃げ角を３５°ないし
８０°としたことを特徴とするガンドリル。In a gun drill consisting of a tip section having a cutting edge and an oil chamber, a hollow shank section having a chip discharge groove, and a chucking driver section, the cutting edge is formed in a straight line from the center of the tip of the tip to the outer peripheral edge of the tip. A gun drill characterized by having a clearance angle of 35° to 80°.