JPH01117816U

JPH01117816U -

Info

Publication number: JPH01117816U
Application number: JP4172688U
Authority: JP
Priority date: 1987-08-22
Filing date: 1988-03-29
Publication date: 1989-08-09
Anticipated expiration: 2003-03-29
Also published as: JPH0645287Y2

Description

[Brief explanation of drawings]

第１図〜第９図は第１の考案及び第２の考案を
具体化した第１実施例を示す図面であつて、第１
図は軸本体先端の部分破断正面図、第２図は第１
図の左側面図、第３図は頭頂部の平面図、第４図
は軸本体の正面図、第５図〜第７図は食付き用段
差部の拡大部分破断図、第８図は頭頂部の拡大部
分破断図、第９図は頭頂部のスラスト分布を説明
するための図である。第１０図及び第１１図は別
の実施例を示す軸本体先端の部分破断正面図、第
１２図及び第１３図は同じく別の実施例を示す軸
本体先端の平面図である。第１４図は従来例を示
す部分破断正面図である。１……シヤンク、２，２０……軸本体、３……
ドリル溝、４，２１ａ，２１ｂ……リーマ溝、２
３……第１のランド、６，２４……第２のランド
（６及び２３，２４は押圧部を構成している）、
７……頭頂部、８……頂点、１０……主切刃、１
０ａ……第１の刃部、１０ｂ……第２の刃部、１
１……外周コーナ、１２……第１の逃げ面、１５
……食付き用段差部、１６……すくい面、１７…
…切刃、１８……第４の逃げ面、Ｌ……中心軸線
、Ｘ……切削回転方向、θ１，θ２……先端角、
θ５……角度、θ６……前進角。 FIGS. 1 to 9 are drawings showing a first embodiment embodying the first invention and the second invention.
The figure is a partially cutaway front view of the tip of the shaft body, and Figure 2 is the first
Figure 3 is a plan view of the top of the head, Figure 4 is a front view of the shaft body, Figures 5 to 7 are enlarged partial cutaway views of the step for biting, and Figure 8 is a top view of the head. FIG. 9, an enlarged partial cutaway view of the top, is a diagram for explaining the thrust distribution at the top of the head. 10 and 11 are partially cutaway front views of the tip of the shaft body showing another embodiment, and FIGS. 12 and 13 are plan views of the tip of the shaft body similarly showing another embodiment. FIG. 14 is a partially cutaway front view showing a conventional example. 1...Shank, 2, 20...Shaft body, 3...
Drill groove, 4, 21a, 21b... Reamer groove, 2
3...first land, 6, 24...second land (6, 23, 24 constitute a pressing part),
7...Top of head, 8...Vertex, 10...Main cutting edge, 1
0a...first blade part, 10b...second blade part, 1
1... Outer circumferential corner, 12... First flank, 15
...Step part for biting, 16... Rake surface, 17...
...cutting edge, 18... fourth flank surface, L... center axis, X... cutting rotation direction, θ1, θ2... tip angle,
θ5...angle, θ6...advance angle.

Claims

[Claims for Utility Model Registration] 1. Cylindrical shaft body 2, 20 connected to shank 1
At least one pair of reamed grooves 4, 21a on the outer periphery of
, 21b, and the reamer grooves 4, 21a in the cutting rotation direction X of the shaft bodies 2, 20.
, 21b on the outer periphery of the shaft main body 2, 20 and extending along the reamer grooves 4, 21a, 21b.
3, 24, the shaft body 2 including the pressing portions 6, 23, 24;
, 20 on the outer periphery of the distal end side of the reamer groove 4, 21a.
.
The surface extending along the radial direction is the rake face 16, and the rake face 16 and the center axis L of the shaft bodies 2, 20
The angle θ5 formed by A flank surface 18 is provided on the top, and the rake surface 16 and the shaft body 2
, 20. A burnishing drilling tool characterized in that a cutting edge 17 is provided on the edge intersecting with the outer circumferential surface. 2 A drill groove 3 and a reamer groove 4 are provided in parallel on the outer periphery of the cylindrical shaft body 2 connected to the shank 1, and on the outer periphery of the shaft body 2 behind the reamer groove 4 in the cutting rotation direction X of the shaft body 2. Pressing part 6
Further, a substantially conical crown portion 7 is provided on the tip side of the shaft body 2, and the drill groove 3 of the crown portion 7 is provided.
A burnishing drilling tool having a main cutting edge 10 provided on an edge continuous with the main cutting edge 10, the main cutting edge 10 being formed continuously from the apex 8 of the top part 7 to the outer peripheral corner 11 of the shaft body 2, The tip angle θ1 formed by the main cutting edge 10a near the center of the parietal portion 7 is set larger than the tip angle θ2 formed by the main cutting edge 10b near the outer periphery of the parietal portion 7, and the main cutting edge near the center of the parietal portion 7 is provided. A burnishing drilling tool characterized in that a relief surface 12 is provided on 10a.