JPS6042509U

JPS6042509U - gun drill

Info

Publication number: JPS6042509U
Application number: JP13403183U
Authority: JP
Inventors: 辰郎福田
Original assignee: 住友電気工業株式会社
Priority date: 1983-08-29
Filing date: 1983-08-29
Publication date: 1985-03-26

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図、第２図は従来のガンドリルの例で第１図が正面
図、第２図は第１図Ａ方向から見た左正面図、第３図は
本考案のガンドリルの一実施例の正面図、第４図は第３
図のＢ方向から見た図、第５図は第４図の点線部の拡大
図である。第６図は従来品イと本考案品口の半径方向の
切削カバランスの説明図、第７図は従来品イと本考案品
口の切屑の流れを示す説明図である。１・・・・・・切刃チップ、２・・・・・・パイプ本体
、３・・・・・・柄部、４・・・・・・す（い面、５・
・・・・・内切刃、５′・・・・・・外切刃、６・・・
・・・油穴、７・・・・・・溝、８・・・・・・マージ
ン部、９・・・・・・切屑、Ｐ・・・・・・アベックポ
イント。Figures 1 and 2 are examples of conventional gun drills, where Figure 1 is a front view, Figure 2 is a left front view seen from direction A in Figure 1, and Figure 3 is an example of an embodiment of the gun drill of the present invention. Front view, Figure 4 is the 3rd
5 is an enlarged view of the dotted line portion in FIG. 4, as seen from direction B in the figure. FIG. 6 is an explanatory diagram of the radial cutting cover balance between the conventional product A and the inventive product, and FIG. 7 is an explanatory diagram showing the flow of chips between the conventional product A and the inventive product. 1... Cutting blade tip, 2... Pipe body, 3... Handle, 4... Seam surface, 5...
...Inner cutting edge, 5'...Outer cutting edge, 6...
... Oil hole, 7 ... Groove, 8 ... Margin, 9 ... Chips, P ... Avec point.

Claims

[Scope of utility model registration request]

(1) In a gun drill in which the cutting tip 1 is fixed to the tip of the main body 2 and the handle 3 is provided at the other end, there is a groove on the rake face 4 of the cutting tip 1 on the outer cutting edge 5' side parallel to the axis. has 7;
The gun drill is characterized in that the groove is directly cut down from the margin portion 8 and its rake angle θ is 10° or less.

(2) Utility model registration Claims Paragraph (1) states that the outer cutting edge angle α is 30° or more, and the distance from the intersection of the outer cutting edge 5' and the inner cutting edge 5 to the outer end of the outer cutting edge A gun drill characterized in that e is smaller than D/4 when defined as the drill diameter.