JPS6310014U

JPS6310014U -

Info

Publication number: JPS6310014U
Application number: JP10335086U
Authority: JP
Priority date: 1986-07-03
Filing date: 1986-07-03
Publication date: 1988-01-22

Description

[Brief explanation of drawings]

第１図は、この考案のドリルの側面図、第２図
はそのドリルの超硬チツプの背面図、第３図は従
来ドリルの側面図、第４図はそのドリルのシヤン
ク先端を示す正面図、第５図は他の従来ドリルの
側面図、第６図はそのドリルの超硬チツプを示す
背面図、第７図はさらに他の従来ドリルを示す側
面図、第８図は、そのドリルのシヤンク先端を表
わす正面図である。１……超硬チツプ、２……鋼シヤンク、３……
ねじれ溝、４……Ｖ溝の切截面、５……ランド部
、６……マージン部、ｂ……Ｖ溝の頂角の稜線、
ｃ……ランド部の回転方向後端、ｄ……ねじれ溝
とマージン部の交点。 Fig. 1 is a side view of the drill of this invention, Fig. 2 is a rear view of the carbide tip of the drill, Fig. 3 is a side view of the conventional drill, and Fig. 4 is a front view showing the tip of the shank of the drill. , FIG. 5 is a side view of another conventional drill, FIG. 6 is a rear view showing the carbide tip of the drill, FIG. 7 is a side view of another conventional drill, and FIG. 8 is a side view of the drill. FIG. 3 is a front view showing the tip of the shank. 1... Carbide chip, 2... Steel shank, 3...
Twisted groove, 4... Cutting surface of V groove, 5... Land part, 6... Margin part, b... Ridge line of apex angle of V groove,
c...Rear end of the land portion in the rotational direction, d...Intersection of the helical groove and the margin portion.

Claims

[Scope of utility model registration request]

2, which is formed by brazing the carbide tip that makes up the tip of the drill to the tip of the steel shank in a V-shape.
In a single-blade twist drill, the ridgeline of the apex angle of the V groove provided at the rear end of the carbide tip in correspondence with the V protrusion at the tip of the steel shank is 180° through the center of rotation.
A carbide drill characterized in that the carbide drill is disposed on a line connecting rear ends in the rotational direction of two lands located at symmetrical positions or on a line substantially equal to the line.