JPH0181210U

JPH0181210U -

Info

Publication number: JPH0181210U
Application number: JP1987177557U
Authority: JP
Priority date: 1987-11-24
Filing date: 1987-11-24
Publication date: 1989-05-31

Description

[Brief explanation of the drawing]

第１図は本考案になるチツプを固定したドリル
の正面図を示し、第２図は第１図の軸方向先端視
図、第３図はチツプを示したもので、そのａは正
面図、ｂはａの下面側図、ｃはａの左側図、ｄは
ａの右側図、第４図は他の実施例になるチツプを
示したもので、そのａは正面図、ｂはａを下方か
らみた左側図、ｃはａを上方からみた左側図、ｄ
はａの右側図、ｅはａの下面側図などである。１−−−ドリル、１１−−−柄部、１２ａ，１
２ｂ−−−ねじれ溝、１５ａ，１５ｂ−−−チツ
プ座、２，３−−−チツプ、２１，３２ａ，３２
ｂ−−−側面、２２ｂ，３１ｂ−−−下面、２３
，３３ａ，３３ｂ−−−直線状切刃、２６，３６
ａ，３６ｂ−−−曲線状切刃。 Fig. 1 shows a front view of a drill with a fixed tip according to the present invention, Fig. 2 is a view from the tip in the axial direction of Fig. 1, and Fig. 3 shows the tip, in which a is a front view; b is a bottom side view of a, c is a left side view of a, d is a right side view of a, and FIG. c is the left side view of a viewed from above, d is the left view of a viewed from above.
is a right side view of a, e is a bottom side view of a, etc. 1---Drill, 11---Handle, 12a, 1
2b---Twisted groove, 15a, 15b---Chip seat, 2, 3---Chip, 21, 32a, 32
b---Side surface, 22b, 31b---Bottom surface, 23
, 33a, 33b --- straight cutting edge, 26, 36
a, 36b --- curved cutting edge.

Claims

[Scope of utility model registration request]

Cutting the central part of the drill shaft, which is plate-shaped and approximately triangular in front, with a circular arc formed by a side surface with a positive angle on at least one corner of the front side and a curved rake face, or a circular arc and a straight line. 1. A throw-away tip for use in a drill, characterized in that the cutting edge is provided with a straight cutting edge formed by a side surface having a positive angle and a planar rake face that are continuous with the cutting edge.