JPS62201612U - - Google Patents

Description

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

第１図および第２図は本考案の一実施例を示す
図であつて、第１図はその側面図、第２図はその
軸線方向先端視図、第３図および第４図は第１図
および第２図中に示された切刃チツプを示す図で
あつて、第３図はその平面図、第４図は第３図中
―線に沿う矢視断面図、第５図は内周側切刃
チツプと外周側切刃チツプの軸線を含む平面にお
ける回転軌跡を示す図、第６図は第５図中矢印
部分の拡大図、第７図は切削状態を示す断面図、
第８図は切刃の切削に供される範囲を示す平面図
、第９図は切屑の生成状態を示す断面図、第１０
図ないし第１２図は本考案で使用される他の切刃
チツプを示す平面図、第１３図は従来のスローア
ウエイ式穴明け工具の一例を示す側面図である。 ２……スローアウエイ式穴明け工具、４……切
刃チツプ、５……切刃チツプ、６……切刃チツプ
、２１……工具本体、２６……外周側切刃チツプ
、２７……内周側切刃チツプ、３４……辺稜部切
刃、３５……ノーズ部切刃、３６……ノーズアー
ル刃、Ｘ……軸線。 1 and 2 are views showing one embodiment of the present invention, in which FIG. 1 is a side view thereof, FIG. 2 is a view as seen from the tip in the axial direction, and FIGS. 3 is a plan view thereof, FIG. 4 is a cross-sectional view taken along the line - in FIG. 3, and FIG. 5 is an internal view of the cutting tip shown in FIG. FIG. 6 is an enlarged view of the arrowed part in FIG. 5, and FIG. 7 is a cross-sectional view showing the cutting state.
Fig. 8 is a plan view showing the range used for cutting by the cutting blade, Fig. 9 is a sectional view showing the state of chip generation, and Fig. 10 is
12 are plan views showing other cutting tips used in the present invention, and FIG. 13 is a side view showing an example of a conventional throw-away type drilling tool. 2... Throwaway type drilling tool, 4... Cutting blade tip, 5... Cutting blade tip, 6... Cutting blade tip, 21... Tool body, 26... Outer cutting edge tip, 27... Inner Peripheral cutting edge tip, 34... Edge cutting edge, 35... Nose cutting edge, 36... Nose radius blade, X... Axis line.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 工具本体の先端部に、底刃の中心部を形成する
内周側切刃チツプと、底刃の外周部とを形成する
外周側切刃チツプとを備えたスローアウエイ式穴
明け工具であつて、前記内周側切刃チツプと前記
外周側切刃チツプとは、同形状同大の平面視略正
三角形状をなすポジテイブスローアウエイチツプ
であり、その各辺稜が辺稜部切刃とされ、正三角
形状の頂部にこの頂部の二等分線に対して対称で
かつ頂角より大なる角をなす２つのノーズ部切刃
がＶ字状に形成され、この２つのノーズ部切刃同
志の交差部にノーズアール刃が形成されており、
前記内周側切刃チツプは、辺稜部切刃とこの辺稜
部切刃に隣接してその内周側に位置するノーズ部
切刃とが底刃とされ、かつ底刃とされたノーズ部
切刃に隣接するノーズアール刃が前記工具本体の
軸線を越えてオーバーセンターとなるように配設
され、前記外周側切刃チツプは、辺稜部切刃とこ
の辺稜部切刃に隣接してその外周側に位置するノ
ーズ部切刃とが底刃とされ、かつ底刃とされたノ
ーズ部切刃にノーズアール刃を介して隣接するノ
ーズ部切刃が前記工具本体の軸線方向後方に向か
うにしたがい前記軸線に対して半径方向内方に向
かうように配設され、さらに前記外周側切刃チツ
プと前記内周側切刃チツプとは、前記内周側切刃
チツプの底刃とされる辺稜部切刃と前記外周側切
刃チツプの底刃とされる辺稜部切刃とが前記工具
本体の軸線を含む平面上の回転軌跡において互い
に交差するように配設されたことを特徴とするス
ローアウエイ式穴明け工具。 A throw-away type drilling tool comprising, at the tip of the tool body, an inner cutting edge tip forming the center of the bottom edge and an outer cutting edge tip forming the outer periphery of the bottom edge. , the inner peripheral cutting edge tip and the outer peripheral cutting edge tip are positive indexable tips having the same shape and the same size and having a substantially equilateral triangular shape in a plan view, each edge of which is a edge edge cutting edge. , two nose cutting edges are formed in a V-shape on the apex of the equilateral triangle and are symmetrical with respect to the bisector of the apex and form an angle larger than the apex angle, and these two nose cutting edges are similar to each other. A nose radius blade is formed at the intersection of
The inner peripheral cutting edge tip has a side ridge cutting edge and a nose cutting edge adjacent to the side ridge cutting edge and located on the inner periphery side as a bottom edge, and a nose portion serving as a bottom edge. A nose radius blade adjacent to the cutting edge is disposed overcenter beyond the axis of the tool body, and the outer cutting edge tip has a side edge cutting edge and a nose radius edge adjacent to the edge cutting edge. The nose cutting edge located on the outer periphery side serves as the bottom edge, and the nose cutting edge adjacent to the bottom cutting edge via the nose round edge faces toward the rear in the axial direction of the tool body. radially inward with respect to the axis, and the outer cutting edge tip and the inner cutting edge tip are bottom edges of the inner cutting edge tip. The edge cutting edge and the edge cutting edge, which is the bottom edge of the outer cutting edge tip, are arranged so as to intersect with each other in a rotation locus on a plane including the axis of the tool body. Throwaway type drilling tool.