JPS5863909U - double-blade drilling tool - Google Patents
double-blade drilling toolInfo
- Publication number
- JPS5863909U JPS5863909U JP15675181U JP15675181U JPS5863909U JP S5863909 U JPS5863909 U JP S5863909U JP 15675181 U JP15675181 U JP 15675181U JP 15675181 U JP15675181 U JP 15675181U JP S5863909 U JPS5863909 U JP S5863909U
- Authority
- JP
- Japan
- Prior art keywords
- tool body
- cutting
- rotation center
- drilling tool
- edge
- 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.)
- Granted
Links
Landscapes
- Drilling Tools (AREA)
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
第１図は先に提案した中心に切刃のないドリルの一例を
示す図でａはその底面視図、ｂはその側面図、第２図は
この考案の一実施例を示す図でａはその底面視図、ｂは
その側面図、第３図から第５図はそれぞれこの考案の他
の各実施例を系す側面図、第６図は第５図の底面視図で
ある。
１・・・・・・工具本体、２・・・・・・切刃チップ、
１３゜２３．３３．４３・・・・・・切刃、１３ａ、
２３ａ。
２３ａ、 ４３ａ−−−−−−内端縁、１３ｂ、
２３ｂ、 ３３ｂ。
４３ｂ・・・・・・凸曲線部、１３Ｃ，２３Ｃ，３３Ｃ
。
４３Ｃ・・・・・・凹曲線部、１４・・・・・・す（い
面、１５・・・・・・切屑排出溝、０・・・・・・回転
中心。Fig. 1 shows an example of the previously proposed drill without a cutting edge in the center, a is a bottom view, b is a side view, and Fig. 2 is a diagram showing an embodiment of this invention. 3 to 5 are side views of other embodiments of this invention, and FIG. 6 is a bottom view of FIG. 5. 1... Tool body, 2... Cutting tip,
13゜23.33.43... Cutting blade, 13a,
23a. 23a, 43a---inner edge, 13b,
23b, 33b. 43b... Convex curved part, 13C, 23C, 33C
. 43C...Concave curved portion, 14...Cutter face, 15...Chip discharge groove, 0...Rotation center.
Claims (1)
て点対称に配置された２つの切刃１３と、各切刃１３の
すくい面１４側に位置しかつ前記工具本体１の軸線方向
に沿って設けられた切屑排出溝１５とを備えた二枚刃の
穴明は工具において、前記各切刃１３の内端縁１３ａは
前記工具本体１９回転中心０から所定距離離されており
、かつ前記各切刃１３を底面視したとき、該切刃１３は
、前記工具本体１の回転中心０側の滑らかな凸曲線部１
３ｂと、前記工具本体１の外周側の滑らかな凹曲線部１
３Ｃとからなり、しかも前記凸曲線部１３ｂと前記曲縁
部１３Ｃは同一回転方向側に位置し、かつ前記凸曲線部
１３ｂは前記凹曲線部１３Ｃに対して切削回転方向に先
行突出していることを特徴とする二枚刃の穴明は工具。Two cutting blades 13 are arranged at the tip of the tool body 1 point-symmetrically with respect to the rotation center 0 of the tool body 1, and two cutting blades 13 are located on the rake face 14 side of each cutting blade 13 and are arranged on the axis of the tool body 1. A two-blade drilling tool is provided with a chip discharge groove 15 provided along the direction, and the inner edge 13a of each cutting edge 13 is spaced a predetermined distance from the rotation center 0 of the tool body 19. , and when each cutting edge 13 is viewed from the bottom, the cutting edge 13 has a smooth convex curved portion 1 on the rotation center 0 side of the tool body 1.
3b, and a smooth concave curved portion 1 on the outer peripheral side of the tool body 1.
3C, and furthermore, the convex curved part 13b and the curved edge part 13C are located on the same rotational direction side, and the convex curved part 13b projects in advance in the cutting rotation direction with respect to the concave curved part 13C. A two-blade drilling tool featuring the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15675181U JPS5863909U (en) | 1981-10-21 | 1981-10-21 | double-blade drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15675181U JPS5863909U (en) | 1981-10-21 | 1981-10-21 | double-blade drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5863909U true JPS5863909U (en) | 1983-04-28 |
| JPH026971Y2 JPH026971Y2 (en) | 1990-02-20 |
Family
ID=29949284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15675181U Granted JPS5863909U (en) | 1981-10-21 | 1981-10-21 | double-blade drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5863909U (en) |
-
1981
- 1981-10-21 JP JP15675181U patent/JPS5863909U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH026971Y2 (en) | 1990-02-20 |
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