JPS61219511A

JPS61219511A - Throwaway tip

Info

Publication number: JPS61219511A
Application number: JP6259885A
Authority: JP
Inventors: Toshiaki Hosoi; 細井　俊明
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-03-27
Filing date: 1985-03-27
Publication date: 1986-09-29

Abstract

PURPOSE:To prevent a cutting edge from chipping and remarkably improve the cutting property and life by forming the surface of a tip of a circular or polygonal board-type body into a projectingly curved surface, while forming the included angle of said cutting edge into a sharp angle, in a throwaway tip. CONSTITUTION:A tip 1 is of a square board type body and its cutting edges 4 are formed on ridgelines at projectingly crossing parts between its surface 2 and peripheral faces 3. The surface 2 of the tip 1 is formed into a projectingly curved surface forming a part of a spherical surface, and its center part is in contact with a plane formed by the edges 21, 22, 23, 24 of its basic board material. The cutting edge 4 formed by the ridgeline at which the surface 2 crosses with the peripheral face 3 on the periphery, has a circular arc curve which forms a part of the spherical surface. And, the included angle theta of the cutting edge 4 at the middle part of each side of the tip 1, is indicated by an angle formed by a tangent line 6 to an edge end part and the peripheral face 3 as a flank, and this angle is set to be a sharp angle.

Description

【発明の詳細な説明】（産業上の利用分野）この発明はスローアウェイチップの切刃形状の改良に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to an improvement in the cutting edge shape of an indexable insert.

（従来技術）従来、スローアウェイチップどして四角形の板状体の四
辺の稜線に鋭角の刃先角の切刃が形成されたものが広く
使用されている。これは四辺の切刃を順次使用し、各切
刃がすべて摩耗すれば捨てるようにしている。このスロ
ーアウェイチップはすくい角がプラスであるために所要
馬力し小さく、切れ味は良いが、切削速度または送り速
度を少し高めると、刃先が欠損しやすく、ｊ、　７．：
がつＣ非常に寿命が短いという欠点がある。刃先角を９
０゜以上にすれば刃先の強度を向上さ」ジることはでき
るが、所要馬力が大きくなって剛性の高い、大型の機械
が必要となるという欠点がある。(Prior Art) Conventionally, indexable inserts in which cutting edges with acute cutting edge angles are formed on the four ridge lines of a rectangular plate-like body have been widely used. This uses the cutting edges on all four sides in sequence, and discards each cutting edge when they are all worn out. Since this indexable insert has a positive rake angle, the required horsepower is small and the cutting quality is good, but if the cutting speed or feed rate is slightly increased, the cutting edge is likely to break. :
GatsuC has the disadvantage of having a very short lifespan. Cutting edge angle to 9
If the angle is greater than 0°, the strength of the cutting edge can be improved, but the disadvantage is that the required horsepower increases and a large, highly rigid machine is required.

（発明の目的）この発明はこのような従来の欠点を解８！ｉ　’ｊるた
めになされたものであり、チップの切刃の刃先角は鋭角
にしたままで、切刃の欠損が生じないようにし、これに
よって優れた切削性を右し゛つつ寿命を著しく向上さけ
たスローアウェイチップを提供するものである。(Objective of the invention) This invention solves these conventional drawbacks! The cutting edge angle of the insert remains at an acute angle to prevent chipping of the cutting edge, thereby providing excellent cutting performance and significantly extending the tool life. It offers throwaway chips.

（発明の構成）この発明は、円形または多角形の板状体であって、その
表面と周面との交差部稜線に切刃が形成されているチッ
プにおいて、上記チップ表面は球面または円錐面の一部
をなす凸曲面に形成され、かつ切刃の刃先角は鋭角に形
成されているものである。このように、切刃を形成する
チップ表面を凸曲面にすることにより、実質上刃先角を
増大させるとともに切刃を湾曲させ、かつ切刃を被剛材
に対して徐々に当接させるようにし、これにＪ：って高
速切削を行っても切刃の欠損が生じないようにした。も
のである。(Structure of the Invention) The present invention provides a chip that is a circular or polygonal plate-like body and has a cutting edge formed at the intersection ridgeline between the surface and the circumferential surface, and the chip surface has a spherical or conical surface. It is formed into a convex curved surface forming a part of the cutting edge, and the cutting edge angle of the cutting edge is formed at an acute angle. In this way, by making the tip surface that forms the cutting edge a convex curve, the cutting edge angle is substantially increased, the cutting edge is curved, and the cutting edge is gradually brought into contact with the rigid material. , and J: to prevent chipping of the cutting edge even when high-speed cutting is performed. It is something.

（実施例）第１図〜第３図においで、チップ１は四角形の板状体で
あって、その表面２と周面３との交差部稜線に切刃４が
形成されている。上記チップ１の表面２は球面の一部を
なす凸曲面に形成され、基準となる（素材として用いる
）板材の辺２１，２゜２．２３．２４によって形成され
る平面に中央部で接し、周辺において周面３と交差する
稜線で形成される切刃４は球面の一部をなす円弧曲線と
なっている。そしてデツプ１の各辺の中央部における切
刃４の刃先角θは、第３図に示すにうに刃先部における
接線６ど逃げ面となる周面３とのなす角で示され、この
角度が鋭角になるように設定されている。(Example) In FIGS. 1 to 3, the tip 1 is a rectangular plate-like body, and a cutting edge 4 is formed at the ridgeline of the intersection between the surface 2 and the circumferential surface 3. The surface 2 of the chip 1 is formed into a convex curved surface forming a part of a spherical surface, and touches a plane formed by sides 21, 2° 2.23.24 of a plate material serving as a reference (used as a raw material) at the center, The cutting edge 4, which is formed by a ridgeline that intersects with the circumferential surface 3 at the periphery, is an arcuate curve that forms part of a spherical surface. The cutting edge angle θ of the cutting edge 4 at the center of each side of the depth 1 is shown in FIG. It is set to have an acute angle.

上記実施例で１五四角形（底面２０の形状が正方形）の
デツプ１を示したが、チップの形状はそれ以外の多角形
でもに＜、あるいは円形であってもよい。In the above embodiment, the depth 1 is five square (the shape of the bottom surface 20 is a square), but the shape of the chip may be any other polygon, or circular.

上記チップ１は、例えば第４図および第５図に示すよう
に通常のチップと同様にカッタ本体９に対して埠宜の固
定手段によって取付けられる。１８はカッタ本体９の回
転中心から放射状に伸びる線、１９はカッタ本体９に形
成されたチップポケットである。The tip 1 is attached to the cutter body 9 by means of fixing means, as shown in FIGS. 4 and 5, for example, in the same way as a normal tip. 18 is a line extending radially from the center of rotation of the cutter body 9, and 19 is a chip pocket formed in the cutter body 9.

第５図において矢印方向にカッタ本体９を回転させて上
記チップ１により切削を行うと、湾曲した切刃４は被削
材５に対して徐々に当１ｉ１ｊＬで切削を行うことにな
る。すなわち、直線的な切刃と異なり被剛材に対して同
時に当接することはなく、徐々に当接することになるた
め、被剛材によって衝撃的な荷重を受けることがない。When the cutter main body 9 is rotated in the direction of the arrow in FIG. 5 and cutting is performed using the tip 1, the curved cutting edge 4 gradually cuts the workpiece 5 at an angle of 1i1jL. That is, unlike a straight cutting blade, the cutting blade does not contact the rigid material at the same time, but gradually contacts the rigid material, so that the cutting blade does not receive an impact load from the rigid material.

また第５図に示されるように切刃４の内側（カッタ本体
９の中心側）から徐々に被剛材に対して当接して切削を
行うために切屑は徐々に外方に押され、しかも切刃４が
湾曲しているために切屑も湾曲し□て外方に押出され、
切刃４に切屑が圧着するのが防止さ糺る。このように□
切削中に切□屑が切刃から順次剥がされるようにすると
、切刃に□加えられる荷重も□減少□して、切削性が向
−卜する□“とと苔に、欠損も生じにくくなる。　　　
　　゛さらにすくい面（表面２）が湾曲しているために、刃先
部が強化されて欠損が生じる′のが防止されている□。Furthermore, as shown in FIG. 5, the cutting blade 4 gradually comes into contact with the rigid material from the inside (center side of the cutter body 9) and cuts, so the chips are gradually pushed outward. Since the cutting edge 4 is curved, the chips are also curved and pushed outward.
This prevents chips from being crimped onto the cutting blade 4. Like this□
If chips are gradually removed from the cutting edge during cutting, the load applied to the cutting edge will also be reduced, improving machinability and making it less likely that chips will occur. .
``Furthermore, since the rake face (surface 2) is curved, the cutting edge is strengthened and chipping is prevented''□.

すなわち、通常の平面のすくい面の場合にはずくし４面
６０は第３１に示すようになって゛切刃４０の刃先角α
は小さくなり、刃□先部６肉の簿い部分が強度が弱いた
めにその部分で欠損が生じ易いが、すくい面２が湾曲し
ている場合にはすくい面の傾斜は実質上同じとして刃先
角゛θが大幅に増大して刃先の弾痕が増大する。す′八
わ砥、□すくい面を湾曲面にするど、讐りい角を実質上
増大させずに、欠損の生じ易い゛刃先先端の肉の薄い部
分を生じさせないために刃先部の強ｉパ向上することに
なる。そして上記のように被繭材に対し□て徐々に当接
することと相俟−′等欠損が生じにくくなり、チップの
寿命が増大することになる。That is, in the case of a normal flat rake face, the four rake surfaces 60 are as shown in No. 31, and the cutting edge angle α of the cutting edge 40 is
becomes smaller, and the weaker part of the tip 6 is weak in strength, making it easy to break.However, if the rake face 2 is curved, the slope of the rake face is assumed to be essentially the same, and the cutting edge The angle ゛θ increases significantly and the number of bullet holes on the cutting edge increases. □By making the rake surface a curved surface, the cutting edge is strengthened to prevent a thin part at the tip of the cutting edge, which is prone to chipping, without substantially increasing the cutting edge angle. This will improve performance. In combination with the gradual contact with the material to be cocooned as described above, defects such as -' are less likely to occur, and the life of the chip is increased.

なお、上記実施例ではチップの表面を球面にした例のみ
を示したが、球面の代りに円錐面としてもよく、その場
合も作用効果は上記のものとほぼ同様である。In the above embodiment, only an example in which the surface of the chip is spherical is shown, but it may be a conical surface instead of a spherical surface, and in that case, the effect is almost the same as that described above.

（発−の効果）以上説明したように、この発明は円形または多角形あ板
状体であって、その表面と周面との交差部稜線に切刃が
形成されているチップにおいてＪその表面を凸曲面に形
成し、かつ切刃の刃先角を鋭角に形成したものであり、
チップの切刃の刃先角は鋭角にしたままで、切刃の欠損
が生じないように□し、これに韮って優れた切削性を有
しつつ寿命を著しく向上させたものである。(Effect of firing) As explained above, the present invention is a circular or polygonal plate-like body, and in a chip in which a cutting edge is formed at the ridgeline at the intersection of the surface and the circumferential surface, the surface of the J. is formed into a convex curved surface, and the cutting edge is formed at an acute angle,
The tip angle of the cutting edge of the chip remains acute to prevent chipping of the cutting edge, and the life of the chip is significantly improved while providing excellent cutting performance.

【図面の簡単な説明】第１−はこの発明の実施例を示す斜視図、第２図はその
側面図、−３図は刃先部の拡大断面図、第４図はチップ
をカッタ本体に取付けた状態の断面図、第５図はその斜
視図である。１・・・ｉツブ、２・・・表面、３・・・周面、４・・
・切刃、−〇　− θ・・・刃先角。[Brief Description of the Drawings] Fig. 1- is a perspective view showing an embodiment of the present invention, Fig. 2 is a side view thereof, Fig. -3 is an enlarged sectional view of the cutting edge, and Fig. 4 shows the tip attached to the cutter body. FIG. 5 is a cross-sectional view of the state shown in FIG. 1...i-tube, 2...surface, 3...peripheral surface, 4...
・Cutting edge, −〇 − θ...Blade angle.

Claims

【特許請求の範囲】[Claims]

１、円形または多角形の板状体であって、その表面と周
面との交差部稜線に切刃が形成されているチップにおい
て、上記チップ表面は球面または円錐面の一部をなす凸
曲面に形成され、かつ切刃の刃先角は鋭角に形成されて
いることを特徴とするスローアウェイチップ。1. In a chip that is a circular or polygonal plate-like body and has a cutting edge formed at the intersection ridgeline of the surface and the peripheral surface, the chip surface is a convex curved surface that forms part of a spherical or conical surface. A throw-away insert characterized in that the cutting edge is formed at an acute angle.