JPS5889218U

JPS5889218U - gun drill

Info

Publication number: JPS5889218U
Application number: JP18616281U
Authority: JP
Inventors: 国森　永年; 辰郎福田
Original assignee: 住友電気工業株式会社
Priority date: 1981-12-12
Filing date: 1981-12-12
Publication date: 1983-06-16

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、この考案のガンドリルの一実施例を示す側面
図、第２図は同上の端面−１第３図、第５図、第６図、
第８図はそれぞれ他の実施例を示す側面図、第４図は第
３図に示すドリルの端面図、第７図は第６図のＸ−Ｘ線
に沿った断面図である。１・・・工具本体、２・・・ストレート溝、３・・・座
面、°　４・・・チップ、５・・・切刃、７・・・すく
い面、８・・・平取部、９・・・逃げ面、１゛０・・・
凹所、１２・・・チップ。Fig. 1 is a side view showing an embodiment of the gun drill of this invention, Fig. 2 is an end view of the same - Fig. 3, Fig. 5, Fig. 6,
8 is a side view showing other embodiments, FIG. 4 is an end view of the drill shown in FIG. 3, and FIG. 7 is a sectional view taken along the line X--X in FIG. 6. 1... Tool body, 2... Straight groove, 3... Seat surface, ° 4... Chip, 5... Cutting edge, 7... Rake face, 8... Flat part, 9 ...Running surface, 1゛0...
Recess, 12...chip.

Claims

[Scope of utility model registration request]

(1) At the tip of the tool body, a pair of chips are arranged point-symmetrically with respect to each other with the starting end of each cutting edge located near the center of rotation, with the center edge being the most advanced edge and the outer peripheral cutting edge slanting backward; Or, one chip with the central cutting edge at the leading edge and the central cutting edge and the peripheral cutting edge tilting backwards, or the central cutting edge at the leading edge and the peripheral cutting edge retracting diagonally, with the starting end of the cutting blade near the center of rotation. Each of the above-mentioned chips has several steps of flattened parts in the axial direction that are convex in the direction of rotation on the rake face near the center of rotation, and the line of intersection with the front flank face is the center edge. Further, an axial recess is provided in the center of the rake face, and a line connecting the center edge and the outer cutting edge is defined as the center cutting edge, and the rake angle in the radial direction of the outer cutting edge is a regular angle or close to it. A gun drill characterized by its angle.

(2) The gun drill according to claim (1), wherein the recess is formed into an arcuate curved surface or a shape in which a plurality of planes intersect.