JPS60120713U

JPS60120713U - Drill

Info

Publication number: JPS60120713U
Application number: JP945184U
Authority: JP
Inventors: 良克森
Original assignee: 住友電気工業株式会社
Priority date: 1984-01-25
Filing date: 1984-01-25
Publication date: 1985-08-15
Also published as: JPS6246492Y2

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

[Brief explanation of the drawing]

第１図は従来のドリルの先端部を示す平面図、第２図は
本考案に係るドリルの一実施例を示す斜視図、第３図は
本考案に係るドリルと従来のドリルとの給油条件の違い
による切削抵抗の違いを示すグラフ図、第４図は本考案
に係るドリルと従来のドリルとの刃先の摩耗量を比較す
るグラフ図である。なお、図中１は芯厚部、２は溝、３は陵部、４は切刃、
６は給油孔である。ＩしＩＩ　　　　　　Ｉ　　　１１２＆−６Ｋｇ−ＣｖＬ’ １　　　。轟 −ＩＸ１’３１ｊ斡潰　　　　　　、　　　外−υ Ｂ４＃遺Fig. 1 is a plan view showing the tip of a conventional drill, Fig. 2 is a perspective view showing an embodiment of the drill according to the present invention, and Fig. 3 is a lubrication condition between the drill according to the present invention and the conventional drill. FIG. 4 is a graph showing the difference in cutting resistance due to the difference in cutting force. FIG. 4 is a graph comparing the amount of wear on the cutting edge of the drill according to the present invention and the conventional drill. In addition, in the figure, 1 is the core thickness part, 2 is the groove, 3 is the ridge part, 4 is the cutting edge,
6 is an oil supply hole. I and II I 1 12&-6Kg-CvL' 1 . Todoroki-IX1'31j destruction, outside-υ B4# remains

Claims

[Scope of utility model registration request]

(1) Set the core thickness to 25% to 35% of the drill diameter and the groove width ratio within the range of 0.4:1 to 0.8:1, and at least 2/3 of the drill diameter to the outer circumference. The rake angle in the radial direction of the shape viewed directly from the cutting edge end surface is configured to be -5'' to positive, and the point on the outer peripheral edge of the cutting edge in the shape viewed directly from the cutting edge end surface and the point on the cutting edge radially from the center. A groove facing the cutting blade across a groove gap with respect to a perpendicular line extending through a point on the outer peripheral edge of the cutting blade to a virtual reference line connecting a point near the outer periphery of 2/3 of the length with a straight line. In a drill made of an ultra-hard material, the distance from a point on the outer peripheral edge of the wall is set to 47% or less of the diameter of the drill, the drill is twisted along a helix angle within the ridge from the rear end to the tip of the drill. A drill characterized by being equipped with a cutting oil supply hole.

(2) - The drill surface is TiC, T1CN, TiN
The drill according to claim 1, which is a registered utility model, and is coated with one or a combination of two or more selected from the group consisting of Al2O3 and Al2O3.