JPH0432812U - - Google Patents
Info
- Publication number
- JPH0432812U JPH0432812U JP7329490U JP7329490U JPH0432812U JP H0432812 U JPH0432812 U JP H0432812U JP 7329490 U JP7329490 U JP 7329490U JP 7329490 U JP7329490 U JP 7329490U JP H0432812 U JPH0432812 U JP H0432812U
- Authority
- JP
- Japan
- Prior art keywords
- cutting edge
- edge ridge
- ridge
- curvature
- 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、本考案ツイストドリルの一実施例を
示す正面図、第２図は、その拡大底面図、第３図
および第４図は、刃先部分における一部拡大正面
図である。
１……ツイストドリル、２……工具本体、３…
…シヤンク、４……ねじれ溝、５……先端切刃稜
、６……外周切刃稜、７……円弧切刃稜。
FIG. 1 is a front view showing one embodiment of the twist drill of the present invention, FIG. 2 is an enlarged bottom view thereof, and FIGS. 3 and 4 are partially enlarged front views of the cutting edge portion. 1...Twist drill, 2...Tool body, 3...
...Shank, 4...Twisted groove, 5...Tip cutting edge ridge, 6...Outer cutting edge ridge, 7...Circular cutting edge ridge.
Claims (1)
先コーナ部分には、曲率半径Ｒによる円弧切刃稜
７を備えているツイストドリルにおいて、 前記円弧切刃稜７は、直線的な先端切刃稜５と
の接続点部分では、刃先直径Ｄを基準にしたとき
に、その接続点部分の直径ｄが０．７５Ｄ≦ｄ≦
０．９５Ｄ、曲率半径ＲがＤ≧Ｒ≧０．２Ｄの範
囲内で設定されるとともに、先端切刃稜５および
接続点における円弧切刃稜７の接線間に構成され
る接続角αがα≧１５°に設定されていることを
特徴とするツイストドリル。[Scope of Claim for Utility Model Registration] A twist drill which is provided with an arcuate cutting edge 7 with a radius of curvature R at the corner portion of the cutting edge where the tip cutting edge ridge 5 and the outer cutting edge ridge 6 intersect, 7 has a diameter d of 0.75D≦d≦ at the connection point with the straight tip cutting edge ridge 5, based on the cutting edge diameter D.
0.95D, the radius of curvature R is set within the range of D≧R≧0.2D, and the connection angle α formed between the tangents of the tip cutting edge ridge 5 and the arcuate cutting edge ridge 7 at the connection point is α A twist drill characterized by being set at ≧15°.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7329490U JPH0432812U (en) | 1990-07-10 | 1990-07-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7329490U JPH0432812U (en) | 1990-07-10 | 1990-07-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0432812U true JPH0432812U (en) | 1992-03-17 |
Family
ID=31611991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7329490U Pending JPH0432812U (en) | 1990-07-10 | 1990-07-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0432812U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009039811A (en) * | 2007-08-08 | 2009-02-26 | Kumamoto Univ | Drilling tools and drilling methods for fiber reinforced composites |
-
1990
- 1990-07-10 JP JP7329490U patent/JPH0432812U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009039811A (en) * | 2007-08-08 | 2009-02-26 | Kumamoto Univ | Drilling tools and drilling methods for fiber reinforced composites |