JPS627312U

JPS627312U -

Info

Publication number: JPS627312U
Application number: JP9619485U
Authority: JP
Priority date: 1985-06-25
Filing date: 1985-06-25
Publication date: 1987-01-17

Description

[Brief explanation of the drawing]

第１図は本考案によるドリルの具体的な実施構
造の一例を示す正面図、第２図はドリルの先端部
を下方から見た底面図、第３図は切削加工時に於
ける本考案のドリルと被削材との関係を示す正面
図、第４図及び第５図は同じく従来のドリルと被
削材との関係を示す正面図、第６図は従来のドリ
ルで穿孔した時に孔の周縁部にできるバリの形状
を示す斜視図である。Ｄ，Ｄ_１，Ｄ_２……ドリル、ｄ，ｄ_１，ｄ_２…
…刃先、Ｈ……孔、Ｈ_１……バリ、Ｈ_２……抜屑
、１……本体、１ａ，１ｂ……刃部、２ａ，２ｂ
……捩れ溝、３ａ，３ｂ……ランド面、４ａ，４
ｂ……切れ刃、５ａ，５ｂ……外周コーナー部、
６ａ，６ｂ……中間部、７ａ，７ｂ……内周端部
、８……チーゼルエツジ、Ｍ……押出形材。 Figure 1 is a front view showing an example of a specific implementation structure of the drill according to the present invention, Figure 2 is a bottom view of the tip of the drill seen from below, and Figure 3 is the drill according to the present invention during cutting. Figures 4 and 5 are front views showing the relationship between the conventional drill and the workpiece, and Figure 6 shows the periphery of the hole when drilling with a conventional drill. FIG. D, D ₁ , D ₂ ... drill, d, d ₁ , d ₂ ...
...Blade tip, H...hole, _H1 ...burr, _H2 ...swarf, 1...body, 1a, 1b...blade, 2a, 2b
...Twisted groove, 3a, 3b...Land surface, 4a, 4
b...Cutting edge, 5a, 5b...Outer corner corner,
6a, 6b...middle part, 7a, 7b...inner peripheral end part, 8...chisel edge, M...extruded shape member.

Claims

[Scope of utility model registration request]

One of the two torsion grooves 2a and 2b symmetrically carved on the outer peripheral surface of the main body 1 of the drill D.
A linear first blade body _B1 is provided at the tip of the cutting edge 4a having the same shape as a normal standard drill,
At the tip of the other helical groove 2b, the outer corner 5b of the cutting edge 4b is slightly higher than the outer corner 5a of the first blade body _B1 , and the intermediate part 6b is lower and the inner end 7b is a chisel edge at the center. 8. A drill characterized in that a second arc-shaped blade body _B2 is provided.