JPS58191913U - 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 the drawing]

第１図は従来の１枚刃ドリルの一例を示す一部省略正面
図、第２図はその底面視図、第３図は従来の１枚刃ドリ
ルの他の例を示す一部省略正面図、第４図はその底面視
図、第５図は従来の１枚刃ドリルによる穴明は加工状況
を示す図、第６図は従来の１枚刃ドリルのさらに他の例
の要部を示す図、第７図は従来の２枚刃ドリルの一例を
示す一部省略正面図、゛第８図はその底面視図、第９図
は従来の２枚刃ドリルの他の例を示す一部省略正面図、
第１０図はその底面視図、第１１図は第７図および第８
図に示すドリルによる穴明は加工状況を示す図、第１２
図ないし第１６図はこの考案の一実施例を示し、第１２
図はその一部省略正面図、第１３図はその底面視図、第
１４図は第１２図のＸ−Ｘ線に沿う断面図、第１５図は
切欠き部の拡大図、第１６図はその穴明は加工状況を示
す図、第１７図はこの考ボの他の実施例を示す一部省略
正面図、第１８図はその底面視図、第１９図はこの　　
・考案のさらに他の実施例を示す一部省略正面図、第２
０図はその底面視図、第２１図は第１９図および第２０
図に示すドリルによる穴明は加工状況を示す図、第２２
図はこの考案のさらに別の他の実施例を示す一部省略正
面図、第２３図はその底面視図である。 ２１・・・ドリル本体、２７ａ・・・内周側外刃、２７
ｂ・・・外周側外刃、２８ａ・・・後退刃、３６ａ。 ３７ａ−・・内周刃、３６ｂ、　３７ｂ−・・外周刃、
４０ａ。 ４１ａ・・・内周刃、４−Ｏｂ、４１ｂ・・・外周刃。 第３図 第 、４゜　　＄５４　１＝Fig. 1 is a partially omitted front view showing an example of a conventional single-blade drill, Fig. 2 is a bottom view thereof, and Fig. 3 is a partially omitted front view showing another example of a conventional single-blade drill. , Fig. 4 is a bottom view thereof, Fig. 5 is a diagram showing the machining situation of a conventional single-blade drill, and Fig. 6 is a diagram showing the main parts of yet another example of the conventional single-blade drill. Fig. 7 is a partially omitted front view showing an example of a conventional two-blade drill, Fig. 8 is a bottom view thereof, and Fig. 9 is a partial view showing another example of a conventional two-blade drill. Abbreviated front view,
Figure 10 is a bottom view, Figure 11 is a view of Figures 7 and 8.
The drilling shown in the figure shows the machining situation.
Figures 16 to 16 show an embodiment of this invention.
The figure is a partially omitted front view, Figure 13 is a bottom view, Figure 14 is a sectional view taken along the line X-X in Figure 12, Figure 15 is an enlarged view of the notch, and Figure 16 is The holes are shown in the figure showing the machining situation, Figure 17 is a partially omitted front view showing another embodiment of this idea, Figure 18 is its bottom view, and Figure 19 is this.
・Partially omitted front view showing still another embodiment of the invention, Part 2
Figure 0 is a bottom view, Figure 21 is a diagram of Figures 19 and 20.
The hole drilling shown in the figure is shown in Figure 22 showing the machining situation.
The figure is a partially omitted front view showing still another embodiment of this invention, and FIG. 23 is a bottom view thereof. 21...Drill body, 27a...Inner peripheral side outer cutter, 27
b... Outer peripheral side outer cutter, 28a... Retracted cutter, 36a. 37a--Inner peripheral blade, 36b, 37b--Outer peripheral blade,
40a. 41a...Inner peripheral blade, 4-Ob, 41b...Outer peripheral blade. Figure 3, 4° $54 1=

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ドリル本体の先端部に、径方向に互いに分割され、かつ
回転軌跡が連続する複数の切刃を形成してなるドリルに
おいて、前記複数の切刃のうち外周側の切刃の内端部に
、その切刃に連続し、かつ中心方向に向かうに従ってそ
の切刃に対して前記ドリル本体の軸線方向後方へ後退す
る後退刃を、この後退刃のそれに径方向に隣接する切刃
に対する前記ドリル本体の軸線方向後方への段差が１刃
あたりの送り量より大きくなるようにして形成してなる
ことを特徴とするドリル。In a drill in which a plurality of cutting blades are formed at the tip of the drill body and are mutually divided in the radial direction and have continuous rotation loci, an inner end of the outer peripheral cutting blade among the plurality of cutting blades, A retracted blade that is continuous with the cutting edge and retracts backward in the axial direction of the drill body with respect to the cutting edge as it goes toward the center, and A drill characterized in that the step in the rearward direction in the axial direction is formed so as to be larger than the feed amount per tooth.