JPS611314U

JPS611314U - double-blade drilling tool

Info

Publication number: JPS611314U
Application number: JP8532984U
Authority: JP
Inventors: 浩二郎今永
Original assignee: 三菱マテリアル株式会社
Priority date: 1984-06-08
Filing date: 1984-06-08
Publication date: 1986-01-07
Also published as: JPH0243610Y2

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図ないし第４図はこの考案の一実施例を示し、第１
図はその底面視図、第２図はその一部省略側面図、第３
図は第１図の■一■線矢視断面図、第４図は第１図の一
部を省略した拡大図、第５図および第６図は従来の二枚
刃のドリルの一例を示し、第５図はその底面視図、第６
図はその一部省略側面図、第７図ないし第１０図は従来
の二枚刃のドリルの他の例を示し、第７図はその底面視
図、第８図はその一部の省略側面図、第９図は第７図の
ＩＸ−ＩＸ線矢視断面図、第１０図は第７図の一部を省
略した拡大図である。１・・・・・・ドリル本体（工具本体）、２，３・・・
・・・切刃、２ａ＊３ａ・・・・・・内端縁、４，５・
・・・・・切屑排出溝、６・・・・・・凹部、６ａ・・
・・・・底面、６ｂ，６ｃ・・・・・・側壁面、６ｄ，
６ｅ・・・・・・傾斜面、０・・・・・・回転中心。Figures 1 to 4 show one embodiment of this invention.
The figure is a bottom view, the second figure is a partially omitted side view, and the third figure is a partially omitted side view.
The figure is a cross-sectional view taken along the line 1 and 2 in Figure 1, Figure 4 is an enlarged view of Figure 1 with a part omitted, and Figures 5 and 6 show an example of a conventional two-blade drill. , Fig. 5 is its bottom view, and Fig. 6 is its bottom view.
The figure is a partially omitted side view, Figs. 7 to 10 show other examples of the conventional two-blade drill, Fig. 7 is a bottom view thereof, and Fig. 8 is a partially omitted side view. 9 is a sectional view taken along the line IX--IX in FIG. 7, and FIG. 10 is an enlarged view with a part of FIG. 7 omitted. 1...Drill body (tool body), 2, 3...
... Cutting edge, 2a*3a ... Inner edge, 4, 5.
...Chip discharge groove, 6...Recess, 6a...
...Bottom surface, 6b, 6c...Side wall surface, 6d,
6e: Inclined surface, 0: Center of rotation.

Claims

[Scope of utility model registration request]

Two cutting edges are formed at the tip of the tool body, each inner edge of which is arranged at a point symmetrical position 0.1 to 1.25771771 away from the rotation center of the tool body, and the tool body corresponds to the two cutting edges. two chip evacuation grooves are formed on the outer periphery of the tool body, and a recess is formed at the tip of the tool body without a cutting edge, each end of which is communicated with the chip evacuation groove. In a single-blade drilling tool, the bottom surface of the recess intersects with the center of rotation, and is inclined from the tip side to the rear end side of the tool body as it goes from the center of rotation toward each chip discharge groove. A two-blade drilling tool, characterized in that the side wall surface of the recess and the cutting edge near the recess are coated with a hard coating.