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JPH0442311U - - Google Patents

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Publication number
JPH0442311U
JPH0442311U JP8484690U JP8484690U JPH0442311U JP H0442311 U JPH0442311 U JP H0442311U JP 8484690 U JP8484690 U JP 8484690U JP 8484690 U JP8484690 U JP 8484690U JP H0442311 U JPH0442311 U JP H0442311U
Authority
JP
Japan
Prior art keywords
drill
cutting edge
bulging portion
cutting
cutting edges
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
Application number
JP8484690U
Other languages
Japanese (ja)
Other versions
JP2533255Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1990084846U priority Critical patent/JP2533255Y2/en
Publication of JPH0442311U publication Critical patent/JPH0442311U/ja
Application granted granted Critical
Publication of JP2533255Y2 publication Critical patent/JP2533255Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Drilling Tools (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図ａは本考案に係る実施例のドリルを示す
正面図、第１図ｂは第１図ａのドリルの縦断面図
、第１図ｃは第１図ａのドリルの形状を示す概念
図、第１図ｄは第１図ａのドリルの先端部を示す
拡大図、第２図ａは従来技術に係るドリルの正面
図、第２図ｂは第２図ａのドリルの端面図である
。 ２０……ドリル、２２……シヤンク部、２４…
…刃部、２６ａ，２６ｂ……切刃部、２８ａ，２
８ｂ……外周側の切刃、３０ａ，３０ｂ……中心
側の切刃、３２ａ，３２ｂ……切屑排出溝、３４
ａ，３４ｂ……壁面、３６ａ，３６ｂ……膨出部
。 FIG. 1a is a front view showing a drill according to an embodiment of the present invention, FIG. 1b is a vertical sectional view of the drill of FIG. 1a, and FIG. 1c is a concept showing the shape of the drill of FIG. 1a. Figure 1d is an enlarged view showing the tip of the drill in Figure 1a, Figure 2a is a front view of the drill according to the prior art, and Figure 2b is an end view of the drill in Figure 2a. be. 20...drill, 22...shank section, 24...
...blade part, 26a, 26b...cutting part, 28a, 2
8b... Cutting blade on the outer peripheral side, 30a, 30b... Cutting blade on the center side, 32a, 32b... Chip discharge groove, 34
a, 34b...Wall surface, 36a, 36b...Bulging portion.

Claims (1)

【実用新案登録請求の範囲】 (1) 切刃を有し、ドリル本体の先端部にそれぞ
れ形成される二つの切刃部と、前記二つの切刃部
間に形成される二つの切屑排出溝とを備えるドリ
ルにおいて、 前記各切屑排出溝の中、各切刃から離間した切
刃部寄りの部位に膨出部を形成することを特徴と
するドリル。 (2) 請求項１記載のドリルにおいて、膨出部は
回転中心軸に対して対称となる二点をそれぞれ中
心とする円弧からなる外形線に沿つた外周面を有
することを特徴とするドリル。[Claims for Utility Model Registration] (1) Two cutting edges each having a cutting edge and formed at the tip of the drill body, and two chip evacuation grooves formed between the two cutting edges. A drill comprising: A bulging portion is formed in each of the chip discharge grooves at a portion closer to the cutting edge and spaced apart from each cutting edge. (2) The drill according to claim 1, wherein the bulging portion has an outer circumferential surface along an outer contour line consisting of circular arcs centered on two points that are symmetrical with respect to the central axis of rotation.
JP1990084846U 1990-08-10 1990-08-10 Drill Expired - Lifetime JP2533255Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1990084846U JP2533255Y2 (en) 1990-08-10 1990-08-10 Drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1990084846U JP2533255Y2 (en) 1990-08-10 1990-08-10 Drill

Publications (2)

Publication Number Publication Date
JPH0442311U true JPH0442311U (en) 1992-04-10
JP2533255Y2 JP2533255Y2 (en) 1997-04-23

Family

ID=31633600

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1990084846U Expired - Lifetime JP2533255Y2 (en) 1990-08-10 1990-08-10 Drill

Country Status (1)

Country Link
JP (1) JP2533255Y2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010538856A (en) * 2007-09-17 2010-12-16 フリードリヒス アルノ Partly ground tool rod made of sintered material
JP2018043313A (en) * 2016-09-14 2018-03-22 住友電工ハードメタル株式会社 drill

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183108U (en) * 1984-05-16 1985-12-05 三菱マテリアル株式会社 double-blade drill

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183108U (en) * 1984-05-16 1985-12-05 三菱マテリアル株式会社 double-blade drill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010538856A (en) * 2007-09-17 2010-12-16 フリードリヒス アルノ Partly ground tool rod made of sintered material
JP2018043313A (en) * 2016-09-14 2018-03-22 住友電工ハードメタル株式会社 drill

Also Published As

Publication number Publication date
JP2533255Y2 (en) 1997-04-23

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term