JPH02135111U - - Google Patents
Info
- Publication number
- JPH02135111U JPH02135111U JP4235789U JP4235789U JPH02135111U JP H02135111 U JPH02135111 U JP H02135111U JP 4235789 U JP4235789 U JP 4235789U JP 4235789 U JP4235789 U JP 4235789U JP H02135111 U JPH02135111 U JP H02135111U
- Authority
- JP
- Japan
- Prior art keywords
- drill
- tip
- chamfering
- centering
- radius
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Drilling Tools (AREA)
Description
第１図は本考案の一実施例であるセンタリング
・チヤンフアリング用ドリルの先端部を示す正面
図である。第２図は第１図のドリルの先端側から
の拡大視図である。第３図は第２図における−
断面端面図である。第４図は第２図におけるＡ
矢視図である。
１２……先端切刃、１６……チゼルエツジ、１
８……シンニング面、θ１……先端角、ｃ１……
心厚、ｄ……底面視における先端切刃の長さ寸法
。
FIG. 1 is a front view showing the tip of a centering and chamfering drill according to an embodiment of the present invention. FIG. 2 is an enlarged view of the drill shown in FIG. 1 from the tip side. Figure 3 shows − in Figure 2.
FIG. 3 is a cross-sectional end view. Figure 4 is A in Figure 2.
It is an arrow view. 12... Tip cutting blade, 16... Chisel edge, 1
8... Thinning surface, θ 1 ... Point angle, c 1 ...
Heart thickness, d... Length dimension of the tip cutting edge when viewed from the bottom.
Claims (1)
先端角および心厚が比較的小さくされたセンタリ
ング・チヤンフアリング用のドリルにおいて、 ドリル先端に形成されるチゼルエツジの両端コ
ーナ部に、前記一対の先端切刃が底面視において
それぞれドリル半径の８０％以上の長さを有して
残されるように略三角形を成す面取り状のシンニ
ング面を設けたことを特徴とするセンタリング・
チヤンフアリング用ドリル。 (2) 前記シンニング面が平面または凸Ｒ面であ
る請求項(1)記載のセンタリング・チヤンフアリ
ング用ドリル。[Scope of claims for utility model registration] (1) Having a pair of cutting edges at the tip,
In a centering and chamfering drill with a relatively small tip angle and core thickness, the pair of tip cutting edges are formed at both end corners of the chisel edge formed at the tip of the drill, each having a radius of 80% of the drill radius when viewed from the bottom. A centering system characterized by having a chamfered thinning surface forming a substantially triangular shape so as to remain with a length of
Drill for chamfering. (2) The centering and chamfering drill according to claim 1, wherein the thinning surface is a flat surface or a convex R surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4235789U JPH02135111U (en) | 1989-04-11 | 1989-04-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4235789U JPH02135111U (en) | 1989-04-11 | 1989-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02135111U true JPH02135111U (en) | 1990-11-09 |
Family
ID=31553832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4235789U Pending JPH02135111U (en) | 1989-04-11 | 1989-04-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02135111U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024241808A1 (en) * | 2023-05-23 | 2024-11-28 | 株式会社不二越 | Drill with oil hole |
-
1989
- 1989-04-11 JP JP4235789U patent/JPH02135111U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024241808A1 (en) * | 2023-05-23 | 2024-11-28 | 株式会社不二越 | Drill with oil hole |
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