JPH07237025A - Throwaway tip - Google Patents
Throwaway tipInfo
- Publication number
- JPH07237025A JPH07237025A JP2854294A JP2854294A JPH07237025A JP H07237025 A JPH07237025 A JP H07237025A JP 2854294 A JP2854294 A JP 2854294A JP 2854294 A JP2854294 A JP 2854294A JP H07237025 A JPH07237025 A JP H07237025A
- Authority
- JP
- Japan
- Prior art keywords
- cutting edge
- flank
- throw
- main cutting
- away tip
- 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
- Milling Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、正面フライスやエンド
ミル等の切削工具に装着されるスローアウェイチップに
関するものであって、特に切削工具の先端外周部に装着
されて被削材の直角削り（９０度肩壁削り）ができるよ
うなスローアウェイチップに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away tip mounted on a cutting tool such as a face milling cutter or an end mill. The present invention relates to a throw-away tip capable of 90 degree shoulder wall scraping.
【０００２】[0002]
【従来の技術】従来、この種のスローアウェイチップと
して、例えば図２０及び２１に示すように、正面フライ
ス等のフライスカッタ１の外周側に取り付けられた方形
で板状のチップ１がある。このスローアウェイチップ２
は、図２０に示すように、着座面をなす下面３と対向す
る上面４を有しており、その四周側面５は下面３から上
面４に向けて外側に傾斜する平面をなしている。各側面
５と上面４とが交差する稜線はそれぞれ主切刃６をな
し、各主切刃６の同一稜線上のコーナー部４ａ近傍には
副切刃７が形成されている。そして、上面４がすくい面
をなし、側面５が主切刃６と副切刃７の逃げ面をなして
おり、主切刃逃げ面と副切刃逃げ面とが同一面（側面
５）とされている。又、上面４の中央部には、上下面を
貫通してチップ２をカッタ等に装着固定するためのネジ
穴８が穿設されている。2. Description of the Related Art Conventionally, as a throw-away tip of this type, for example, as shown in FIGS. 20 and 21, there is a rectangular plate-like tip 1 attached to the outer peripheral side of a milling cutter 1 such as a face mill. This throwaway tip 2
As shown in FIG. 20, has a top surface 4 opposed to a bottom surface 3 forming a seating surface, and its four circumferential side surfaces 5 form a plane inclined outward from the bottom surface 3 toward the top surface 4. The ridge line where each side surface 5 and the upper surface 4 intersect forms a main cutting edge 6, and a sub cutting edge 7 is formed in the vicinity of a corner portion 4a on the same ridge line of each main cutting edge 6. Then, the upper surface 4 forms a rake surface, and the side surface 5 forms a flank of the main cutting edge 6 and the sub cutting edge 7, and the main cutting edge flank and the sub cutting edge flank are the same surface (side surface 5). Has been done. A screw hole 8 is formed in the center of the upper surface 4 so as to penetrate the upper and lower surfaces and mount and fix the chip 2 on a cutter or the like.
【０００３】このようなスローアウェイチップ２を正面
フライスカッタ１の外周側先端部でシート部に取り付け
る際、カッタ本体の回転軸線Ｌに対して正の角度αをな
すように、ポジティブのアキシャルレーキ角を持たせて
位置させる。しかも、カッタ本体の半径方向の軸線Ｍに
対して負の角度βをなすように、ネガティブのラジアル
レーキ角を持たせて位置させる。このようなカッタ１で
被削材Ｗを直角削り（９０度肩壁削り）切削しようとす
る場合、図２１に示すように、スローアウェイチップ２
のカッタ外周側に位置する主切刃６で、被削材Ｗの直角
壁面をつくるよう切削し、先端側に位置する稜線外側の
副切刃７がポジのアキシャルレーキ角とネガのラジアル
レーキ角によって切込み角を付けられているので、方形
板状のチップ２で直角削りを行うことができる。When such a throw-away tip 2 is attached to the seat portion at the outer peripheral side tip portion of the front milling cutter 1, a positive axial rake angle is formed so as to make a positive angle α with respect to the rotation axis L of the cutter body. And position it. Moreover, the cutter body is positioned with a negative radial rake angle so as to form a negative angle β with respect to the radial axis M of the cutter body. When the work W is to be cut at a right angle (90 degree shoulder wall cutting) with such a cutter 1, as shown in FIG.
The main cutting edge 6 located on the outer peripheral side of the cutter cuts to form a right-angled wall surface of the work material W, and the auxiliary cutting edge 7 located on the tip side outside the ridge line is positive axial rake angle and negative radial rake angle. Since the cutting angle is provided by the, the rectangular plate-shaped tip 2 can be used for right-angle cutting.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述の
ようなスローアウェイチップ２では、アキシャルレーキ
角がポジでラジアルレーキ角がネガになるようカッタに
装着されており、しかも主切刃６と副切刃７の逃げ角が
同一面（側面５）上にあり、ラジアルレーキ角がネガに
設定されているために、主切刃６の逃げ角は過大なポジ
となる。そのため、切刃強度が小さくなって欠損を生じ
易いので、チップの寿命が短いという欠点があった。However, the throw-away tip 2 as described above is mounted on the cutter so that the axial rake angle is positive and the radial rake angle is negative, and moreover, the main cutting edge 6 and the sub cutting edge are provided. Since the clearance angle of the blade 7 is on the same plane (side surface 5) and the radial rake angle is set to negative, the clearance angle of the main cutting edge 6 becomes an excessively positive position. As a result, the strength of the cutting edge is reduced and defects are likely to occur, resulting in a short life of the chip.
【０００５】本発明は、このような実情に鑑みて、直角
削りが可能で、しかもその寿命を大幅に向上できるよう
にしたスローアウェイチップを提供することを目的とす
る。In view of the above situation, it is an object of the present invention to provide a throw-away tip which can be cut at a right angle and whose life can be greatly improved.
【０００６】[0006]
【課題を解決するための手段】本発明によるスローアウ
ェイチップは、多角形の板状をなし、着座面と対向する
上面の稜線部が切刃をなすと共に上面がすくい面とさ
れ、着座面から上面に向けて外側に傾斜する側面が逃げ
面とされているスローアウェイチップにおいて、二つの
コーナー間の稜線部の一方のコーナー寄りに副切刃が設
けられ、この副切刃に対して他方のコーナーに向けて延
びる主切刃が設けられ、副切刃に交差する側面にはポジ
ティブな逃げ角を有する副切刃逃げ面が設けられ、主切
刃に交差する側面上部には、主切刃に沿って延在する小
幅の主切刃第１逃げ面が設けられ、この主切刃第１逃げ
面は、逃げ角が副切刃側から他方のコーナー方向に向け
て副切刃逃げ面の逃げ角から次第に小さくなるように設
定されていることを特徴とするものである。A throw-away tip according to the present invention has a polygonal plate shape, a ridge line portion of an upper surface facing a seating surface forms a cutting edge, and an upper surface is a rake surface. In the throw-away tip in which the side surface sloping outward toward the upper surface is the flank, a sub cutting edge is provided near one corner of the ridge line portion between the two corners, and the sub cutting edge of the other side is provided. A main cutting edge extending toward the corner is provided, a sub cutting edge flank having a positive clearance angle is provided on the side surface intersecting the sub cutting edge, and a main cutting edge is provided on the upper side surface intersecting the main cutting edge. A small-width main cutting edge first flank extending along is provided, and the main cutting edge first flank has a relief angle of a sub-cutting edge flank from the sub-cutting edge side toward the other corner direction. That it is set to gradually decrease from the clearance angle It is an butterfly.
【０００７】副切刃は主切刃に対して微少角度だけ上面
の内側寄りに傾斜して設けられていることを特徴とす
る。又、主切刃第１逃げ面の逃げ角は、副切刃側から他
方のコーナー方向に向けてポジティブからネガティブに
次第に変化して設定されていることを特徴とする。又、
副切刃逃げ面は、側面において着座面から副切刃に向け
て外側に傾斜して延びる平坦面とされていることを特徴
とする。又、側面の主切刃の逃げ面領域において、主切
刃第１逃げ面と副切刃逃げ面との間に、副切刃逃げ面よ
り小さい逃げ角の主切刃第２逃げ面が形成されているこ
とを特徴とする。又、上面においてコーナーを挟む二つ
の稜線部にそれぞれ設けられた主切刃は、互いにほぼ直
角になっていることを特徴とする。The auxiliary cutting edge is characterized in that it is inclined toward the inner side of the upper surface by a slight angle with respect to the main cutting edge. Further, the relief angle of the first flank of the main cutting edge is characterized by being set so as to gradually change from positive to negative from the side of the sub cutting edge toward the other corner. or,
The auxiliary cutting edge flank is characterized in that the side surface is a flat surface extending from the seating surface toward the auxiliary cutting edge so as to incline outward. Further, in the flank area of the main cutting edge on the side surface, between the main cutting edge first flank and the sub cutting edge flank, a main cutting edge second flank having a clearance angle smaller than that of the sub cutting edge flank is formed. It is characterized by being. In addition, the main cutting edges respectively provided on the two ridges that sandwich the corner on the upper surface are substantially perpendicular to each other.
【０００８】副切刃と主切刃との境界の稜線部に切欠が
設けられていることを特徴とする。この切欠は円弧形状
または多角形形状に上面と側面を切り欠いて形成されて
いることを特徴とする。更に、上面の稜線部にランドが
設けられていることを特徴とする。又、上面のランドの
内側にブレーカ溝が設けられていることを特徴とする。It is characterized in that a notch is provided at a ridge line portion of a boundary between the sub cutting edge and the main cutting edge. This notch is characterized in that it is formed in a circular arc shape or a polygonal shape by cutting out the upper surface and the side surface. Further, it is characterized in that a land is provided on the ridge line portion of the upper surface. Further, a breaker groove is provided inside the land on the upper surface.
【０００９】１または複数のスローアウェイチップが、
ラジアルレーキ角がネガティブになると共に、アキシャ
ルレーキ角がポジティブとなるように装着されてなる切
削工具において、スローアウェイチップは上述したいず
れかのスローアウェイチップであることを特徴とする。One or more throw-away tips
In the cutting tool mounted such that the radial rake angle becomes negative and the axial rake angle becomes positive, the throw-away tip is any one of the above-mentioned throw-away tips.
【００１０】[0010]
【作用】本発明によるスローアウェイチップが、ラジア
ルレーキ角がネガティブになると共に、アキシャルレー
キ角がポジティブとなるように切削工具に装着される
と、外周切刃の部分において、工具の基端側部分に位置
する副切刃の逃げ面は切削工具の回転軸線に近い側に位
置するが、ポジティブの逃げ角を有するために切削時に
被削材壁面に当接せず、主切刃の主切刃第１逃げ面は切
削工具の回転軸線から比較的遠い位置にあるため、逃げ
角をより小さくすることができ、切刃強度が高い。又、
主切刃第１逃げ面の逃げ角がポジティブからネガティブ
になっているので、特に切刃先端方向に向けて切刃強度
が次第により高くなる。副切刃と主切刃との間に切り欠
けを設けることで、切削時に副切刃が摩耗しても副切刃
の幅が増大することを抑制でき、面圧の増大やびびり振
動の発生や主切刃の摩耗を抑制するのに寄与する。上面
の稜線部にランドを設けることで、切刃強度を高めるこ
とができる。When the throw-away tip according to the present invention is mounted on a cutting tool so that the radial rake angle becomes negative and the axial rake angle becomes positive, at the outer peripheral cutting edge portion, the base end side portion of the tool The flank of the secondary cutting edge located on the side is close to the axis of rotation of the cutting tool, but it has a positive clearance angle, so it does not contact the wall surface of the work material during cutting, and the main cutting edge of the main cutting edge Since the first flank is located relatively far from the rotation axis of the cutting tool, the clearance angle can be made smaller and the cutting edge strength is high. or,
Since the clearance angle of the first flank of the main cutting edge is changed from positive to negative, the strength of the cutting edge is gradually increased particularly toward the tip direction of the cutting edge. By providing a notch between the sub cutting edge and the main cutting edge, it is possible to prevent the width of the sub cutting edge from increasing even if the sub cutting edge wears during cutting, increasing the surface pressure and generating chatter vibration. Also contributes to suppressing wear of the main cutting edge. By providing the land on the ridge portion of the upper surface, the strength of the cutting edge can be increased.
【００１１】[0011]
【実施例】以下、本発明の実施例を添付図面により説明
するが、上述の従来技術と同様の部分には同一の符号を
用いてその説明を省略する。図１乃至図７は本発明の第
一実施例を示すものであり、図１は本実施例によるスロ
ーアウェイチップの平面図、図２は側面図、図３は図２
のＸ−Ｘ線部分断面図、図４は図１のＡ部拡大図、図５
は本実施例のスローアウェイチップをカッタに装着した
状態の一部破断側面図、図６は図５と別の角度からみた
側面図、図７は正面図である。図１乃至図４において、
本実施例によるスローアウェイチップ１０は方形（図で
は略正方形）の板状をなしていて、着座面をなす下面１
１と対向する上面１２を有している。上面１２の略四辺
をなす稜線部には主切刃１３がそれぞれ形成され、各コ
ーナー部には円弧状のコーナー刃１４が設けられてい
る。隣接する稜線部の各主切刃１３は互いに直交してい
る（図４参照）。そして、各稜線部における主切刃１３
と一方のコーナー刃１４との間は、主切刃１３に対して
微少角度γ（例えば１〜５゜）だけ上面１２上で内側に
傾斜した副切刃１５が形成され、この副切刃１５は滑ら
かにコーナー刃１４に接続されるようになっている。上
面１２はすくい面をなしていて、上面１２の中央部に
は、下面１１まで貫通するチップネジ止め用のネジ穴１
６が穿設されている。Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts as those of the above-mentioned conventional art are designated by the same reference numerals and the description thereof will be omitted. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a plan view of a throw-away tip according to this embodiment, FIG. 2 is a side view, and FIG. 3 is FIG.
5 is a partial sectional view taken along line X-X of FIG.
FIG. 7 is a partially cutaway side view of the cutter in which the throw-away tip of this embodiment is mounted, FIG. 6 is a side view seen from an angle different from FIG. 5, and FIG. 7 is a front view. 1 to 4,
The throw-away tip 10 according to this embodiment has a rectangular (substantially square in the figure) plate shape, and a lower surface 1 that forms a seating surface.
It has an upper surface 12 opposite to 1. A main cutting edge 13 is formed on each of the ridges forming the four sides of the upper surface 12, and an arcuate corner blade 14 is provided on each corner. The main cutting edges 13 of adjacent ridges are orthogonal to each other (see FIG. 4). And the main cutting edge 13 at each ridge
Between one of the corner cutting edges 14 and one of the corner cutting edges 14 is formed a sub cutting edge 15 inclined inwardly on the upper surface 12 by a small angle γ (for example, 1 to 5 °) with respect to the main cutting edge 13. Is smoothly connected to the corner blade 14. The upper surface 12 is a rake surface, and the central portion of the upper surface 12 is a screw hole 1 for fixing a chip screw that penetrates to the lower surface 11.
6 is provided.
【００１２】又、下面１１と上面１２との間の各側面１
８は、図２に示すように、それぞれ下面１１から上面１
２に向けて外側に傾斜して延びており、下面１１から副
切刃１５に至る平面領域がポジティブの逃げ角を有する
副切刃逃げ面１９をなしている。又、側面１８の、主切
刃１３と交差し且つ主切刃１３に沿って一方のコーナー
刃１４まで延在する小幅の部分は、主切刃１３の主切刃
第１逃げ面２０とされている。この主切刃第１逃げ面２
０の逃げ角は、副切刃１５との境界領域で副切刃逃げ面
１９の逃げ角と同一角度のポジティブであり、コーナー
刃１４方向に向けて次第に逃げ角が小さくなって、ネガ
ティブになるように形成されている。そのため、主切刃
１３に沿う主切刃第１逃げ面２０は、副切刃１５側から
主切刃１３に沿って、逃げ角がポジから漸次小さくなっ
てネガになるねじれ逃げ面を構成する。又、側面１８に
おいて、主切刃第１逃げ面２０の下面１１側の領域で
は、副切刃逃げ面１９が三角形の形状に切り欠かれて、
副切刃逃げ面１９よりも小さいポジティブな逃げ角を有
する主切刃第２逃げ面２２が形成されている。尚、各側
面１８のコーナー部は、下面１１からコーナー刃１４に
向けて外側に傾斜する円筒側面形状の曲面１４ａが形成
されている。Each side surface 1 between the lower surface 11 and the upper surface 12
As shown in FIG. 2, the reference numerals 8 denote lower surface 11 to upper surface 1 respectively.
2, the plane area extending from the lower surface 11 to the auxiliary cutting edge 15 forms an auxiliary cutting edge flank 19 having a positive clearance angle. Further, a small width portion of the side surface 18 which intersects the main cutting edge 13 and extends along the main cutting edge 13 to one corner blade 14 is defined as a main cutting edge first flank 20 of the main cutting edge 13. ing. This main cutting edge first flank 2
The clearance angle of 0 is positive at the same angle as the clearance angle of the secondary cutting edge flank 19 in the boundary region with the secondary cutting edge 15, and the clearance angle gradually becomes smaller toward the corner blade 14 and becomes negative. Is formed. Therefore, the main cutting edge first flank 20 along the main cutting edge 13 constitutes a twist flank that becomes negative as the clearance angle gradually decreases from positive along the main cutting edge 13 from the side of the secondary cutting edge 15. . Further, in the side surface 18, in the region on the lower surface 11 side of the main cutting edge first flank 20, the auxiliary cutting edge flank 19 is cut out in a triangular shape,
A second main cutting edge flank 22 having a positive clearance angle smaller than that of the sub cutting edge flank 19 is formed. The corners of each side surface 18 are formed with a cylindrical side surface-shaped curved surface 14a that inclines outward from the lower surface 11 toward the corner blade 14.
【００１３】このようなスローアウェイチップ１０が正
面フライスカッタ１に装着された状態が、図５乃至図７
に示されている。このチップ１０は装着状態で、図５に
示すように、副切刃１５が先端面外側に位置し、外周先
端側に、隣接する稜線部の主切刃１３がカッタ本体の回
転軸線Ｌと平行に位置するようになっている。又、図６
に示すようにアキシャルレーキ角がポジティブで、図７
に示すようにラジアルレーキ角がネガティブになるよう
位置決めされている。特に、図６に示すアキシャルレー
キ角を有するチップ１０において、カッタ１の外周面側
に位置する側面１８に関して、外周刃をなす主切刃１３
は、被削材Ｗの直角壁面を形成するべく軸線方向先端側
に位置し、基端側に切削に関与しない副切刃１５が位置
することになる。しかも、基端側の逃げ面である副切刃
逃げ面１９が主切刃第１逃げ面２０よりも軸線Ｌに近接
するために、逃げ角が切刃先端方向に向けて次第に小さ
くなる主切刃第１逃げ面２０よりも大きい逃げ角が、副
切刃逃げ面１９に与えられて、副切刃逃げ面１９の逃げ
角はポジティブになる。A state in which such a throw-away tip 10 is mounted on the front milling cutter 1 is shown in FIGS.
Is shown in. In the mounted state of the tip 10, as shown in FIG. 5, the auxiliary cutting edge 15 is positioned outside the tip surface, and the main cutting edge 13 of the adjacent ridge line portion is parallel to the rotation axis L of the cutter body on the outer peripheral tip side. It is located in. Also, FIG.
As shown in Fig. 7, the axial rake angle is positive and Fig. 7
It is positioned so that the radial rake angle becomes negative as shown in. In particular, in the tip 10 having the axial rake angle shown in FIG. 6, the main cutting edge 13 forming the outer peripheral edge is formed with respect to the side surface 18 located on the outer peripheral surface side of the cutter 1.
Is located on the tip side in the axial direction so as to form a right-angled wall surface of the work material W, and the auxiliary cutting edge 15 not involved in cutting is located on the base end side. Moreover, since the auxiliary cutting edge flank 19 which is the flank on the base end side is closer to the axis L than the main cutting edge first flank 20, the main cutting edge has a flank angle that gradually decreases toward the cutting edge tip direction. A relief angle larger than that of the first blade flank 20 is given to the sub cutting edge flank 19, and the flank angle of the sub cutting edge flank 19 becomes positive.
【００１４】しかし、主切刃１３の領域では比較的軸線
Ｌから離れるために、主切刃第１逃げ面２０の逃げ角は
副切刃逃げ面１９の逃げ角よりも小さくてよく、本実施
例ではポジからネガへ次第に変化するねじれ逃げ面とさ
れている。そのため、主切刃１３の刃先強度を大きくす
ることができることになり、特に主切刃１３は、副切刃
１５と比較してその長さが大きく且つ切削によって直角
壁面を形成するために被削材Ｗとの接触領域が大きいも
のであるため、このようなスローアウェイチップ１０の
寿命を大幅に向上できる。However, in the region of the main cutting edge 13, the clearance angle of the first flank 20 of the main cutting edge may be smaller than the clearance angle of the flank 19 of the secondary cutting edge because it is relatively far from the axis L. In the example, it is a twist flank that gradually changes from positive to negative. Therefore, the cutting edge strength of the main cutting edge 13 can be increased, and in particular, the main cutting edge 13 has a larger length than the sub cutting edge 15 and is formed by cutting to form a right-angled wall surface. Since the contact area with the material W is large, the life of such a throw-away tip 10 can be greatly improved.
【００１５】以上のように、本実施例によれば、主切刃
１３に沿って延在する小幅の主切刃第１逃げ面２０の逃
げ角が、副切刃逃げ面１９の逃げ角であるポジティブの
角度から次第に小さくなってネガティブに変わるねじれ
逃げ面形状に形成されているから、９０度肩壁削り能力
に影響を与えることなく、特に主切刃部分の刃先強度を
大きくすることができて、チップ寿命を大幅に向上させ
ることができる。As described above, according to the present embodiment, the clearance angle of the first flank 20 of the small-width main cutting edge extending along the main cutting edge 13 is equal to the clearance angle of the secondary cutting edge flank 19. Since it is formed into a twist flank shape that gradually decreases from a certain positive angle and changes to a negative angle, it is possible to increase the cutting edge strength of the main cutting edge part without affecting the 90 ° shoulder wall cutting ability. Therefore, the chip life can be significantly improved.
【００１６】次に、本発明の第二実施例を図８乃至図１
１により説明する。図８は第二実施例によるスローアウ
ェイチップの平面図、図９は図８のＹ−Ｙ線断面図、図
１０は図８のＢ部拡大図、図１１は図９のＣ部拡大図で
ある。本実施例においては、上面１２の切刃をなす稜線
に平坦ランド２５が全周に亘って設けられている。そし
て、上面１２の中央領域には、下面１１と平行で切刃部
分より下面１１までの距離が小さい底面２６が設けら
れ、底面２６とランド２５との間には、ランド２５から
底面２６に至る平面状の傾斜面２７が設けられているこ
とで、ブレーカ溝２８が形成されている。従って、本実
施例によれば、ブレーカ溝２８とランド２５を設けるこ
とで、切屑の排出が良好になると共に、主切刃１３、副
切刃１５及びコーナー刃１４が強化されて、刃先強度と
チップ寿命が向上する。Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to 1. 8 is a plan view of a throw-away tip according to the second embodiment, FIG. 9 is a sectional view taken along line YY of FIG. 8, FIG. 10 is an enlarged view of a B portion of FIG. 8, and FIG. 11 is an enlarged view of a C portion of FIG. is there. In this embodiment, a flat land 25 is provided on the ridgeline forming the cutting edge of the upper surface 12 over the entire circumference. A bottom surface 26 that is parallel to the bottom surface 11 and has a smaller distance from the cutting edge to the bottom surface 11 is provided in the central region of the top surface 12. Between the bottom surface 26 and the land 25, the land 25 extends to the bottom surface 26. Since the flat inclined surface 27 is provided, the breaker groove 28 is formed. Therefore, according to the present embodiment, by providing the breaker groove 28 and the land 25, the chip discharge is improved, and the main cutting edge 13, the sub cutting edge 15 and the corner edge 14 are strengthened to improve the edge strength. Chip life is improved.
【００１７】図１２乃至図１５は本発明の第三実施例を
示すものであり、図１２は本実施例によるスローアウェ
イチップの平面図、図１３は側面図、図１４は図１２の
Ｄ部拡大図、図１５は図１４に示す部分の被削材切削状
態を示す図である。図１２乃至図１４に示すスローアウ
ェイチップ３０において、スローアウェイチップ３０の
上面１２のコーナー部付近の稜線部で、副切刃１５の一
端は境界点Ｐ１において、コーナー刃１４と接続されて
おり、他端は境界点Ｐで終了している。そして、境界点
Ｐとこれに続く主切刃１３との間には、切り欠け３１が
形成されている。この切り欠け３１は、平面視で主切刃
１３側より副切刃１５側で傾斜がなだらかになるよう形
成され（図１４参照）、しかも側面１８の下面１１方向
に延在して下面１１まで到達して形成されている（下面
１１に到達せずに途中で途切れていてもよい）。尚、切
り欠け３１の稜線方向の幅は適宜の長さに設定すればよ
いが、好ましくは副切刃１５と同等かそれより小さく設
定すればよい。12 to 15 show a third embodiment of the present invention. FIG. 12 is a plan view of a throw-away tip according to this embodiment, FIG. 13 is a side view, and FIG. 14 is a portion D of FIG. FIG. 15 is an enlarged view, and FIG. 15 is a view showing a cutting state of the work material in the portion shown in FIG. In the throw-away tip 30 shown in FIG. 12 to FIG. 14, one end of the auxiliary cutting edge 15 is connected to the corner blade 14 at the boundary point P1 at the ridge line portion near the corner of the upper surface 12 of the throw-away tip 30. The other end ends at the boundary point P. A notch 31 is formed between the boundary point P and the main cutting edge 13 following the boundary point P. This notch 31 is formed so that the inclination becomes gentler from the main cutting edge 13 side to the sub cutting edge 15 side in a plan view (see FIG. 14), and further extends in the direction of the lower surface 11 of the side surface 18 to the lower surface 11. It reaches and is formed (it may be interrupted on the way without reaching the lower surface 11). The width of the notch 31 in the ridge direction may be set to an appropriate length, but is preferably set to be equal to or smaller than the sub cutting edge 15.
【００１８】ところで、従来のスローアウェイチップに
おいては、切削時に副切刃によって直角削りの切込みが
行われ、副切刃が摩耗すると、これに接続されている主
切刃の方向に副切刃の幅が広がってしまい、その分だけ
切削時の面圧が大きくなるために、びびり振動を起こし
たり、主切刃の摩耗を起こす等して、チップ寿命が短く
なる欠点があっった。その点、本第三実施例では、上述
のような構成を採用することにより、図１５に示すよう
に、カッタに装着されて切削状態におかれた場合、Ｐ１
−Ｐ間で被削材Ｗに当接する副切刃１５によって切込み
が行われて副切刃１５が摩耗したとしても、主切刃１３
との間に切り欠け３１が存在するために、副切刃１５の
幅の広がりを抑制できることになる。そのため、切削時
に副切刃１５が摩耗しても面圧が増大するのを抑え、び
びり振動の発生や主切刃の摩耗を抑制でき、この点にお
いてもチップ寿命の向上に寄与することになる。By the way, in the conventional throw-away tip, when the sub-cutting edge is cut at a right angle during cutting and the sub-cutting edge is worn, the sub-cutting edge is moved in the direction of the main cutting edge connected thereto. Since the width becomes wider and the surface pressure at the time of cutting increases correspondingly, chatter vibration occurs, wear of the main cutting edge occurs, etc., and there is a drawback that the chip life is shortened. In this regard, in the third embodiment, by adopting the above-mentioned configuration, as shown in FIG. 15, when the cutter is mounted and the cutting state is set, P1 is set.
Even if the sub-cutting edge 15 abutting against the work material W between -P is cut and the sub-cutting edge 15 is worn, the main cutting edge 13
Since the notch 31 is present between and, the width of the auxiliary cutting edge 15 can be suppressed from expanding. Therefore, even if the auxiliary cutting edge 15 is worn during cutting, it is possible to prevent the surface pressure from increasing, and it is possible to suppress chatter vibration and wear of the main cutting edge, which also contributes to the improvement of the chip life. .
【００１９】図１６及び図１７は、本発明の第四実施例
を示すものである。本実施例においては、第二実施例と
同様に、上面１２の稜線部に全周に亘って平坦ランド２
５が形成されている。副切刃１５の境界点Ｐと主切刃１
３との境界において、このランド２５を上面中央方向に
切り欠いて切り欠け３３が形成され、しかも、この切り
欠け３３は側面１８を上面１２から下面１１まで切り欠
いて形成されている。本実施例では、切り欠け３３は上
面中央部方向にランド２５の幅より小さい深さだけ切り
欠いて形成されている。そのため、切り欠け３３部分の
切刃もランド２５で強化されることになる。16 and 17 show a fourth embodiment of the present invention. In the present embodiment, as in the second embodiment, the flat land 2 is formed on the ridge of the upper surface 12 over the entire circumference.
5 is formed. Boundary point P of sub cutting edge 15 and main cutting edge 1
At the boundary with 3, the notch 33 is formed by notching the land 25 in the central direction of the upper surface, and the notch 33 is formed by notching the side surface 18 from the upper surface 12 to the lower surface 11. In this embodiment, the notch 33 is formed by notching a depth smaller than the width of the land 25 toward the center of the upper surface. Therefore, the cutting edge of the notch 33 portion is also strengthened by the land 25.
【００２０】図１８及び図１９は、第三実施例による切
り欠け３０の変形例であり、図１８に示す切り欠け３６
は水平断面で台形に切り欠かれている。図１９に示す切
り欠け３７は水平断面で円弧状に切り欠かれて形成され
ている。切り欠けの形状は、これらのものに限定される
ことなく、その他の適宜の多角形や曲線形状を採用でき
る。又、これらの切り欠けは、第四実施例に示す平坦ラ
ンド２５を有するスローアウェイチップに設けられても
よいことはいうまでもない。又、上述の各実施例におい
て、コーナー刃１４は平面視で円弧状に形成するように
したが、チャンファに形成してもよい。18 and 19 show a modification of the notch 30 according to the third embodiment, and the notch 36 shown in FIG.
Has a trapezoidal cutout in horizontal section. The cutout 37 shown in FIG. 19 is formed by cutting out in an arc shape in a horizontal cross section. The shape of the notch is not limited to these, and any other suitable polygonal shape or curved shape can be adopted. Needless to say, these notches may be provided in the throw-away tip having the flat land 25 shown in the fourth embodiment. Further, in each of the above embodiments, the corner blade 14 is formed in an arc shape in a plan view, but it may be formed in a chamfer.
【００２１】[0021]
【発明の効果】本発明に係るスローアウェイチップは、
二つのコーナー間の稜線部の一方のコーナー部寄りに副
切刃が設けられ、他方のコーナーに向けて延びる主切刃
が設けられ、副切刃に交差する側面にはポジティブな逃
げ角を有する副切刃逃げ面が設けられ、主切刃に交差す
る側面上部には、主切刃に沿って延在する小幅の主切刃
第１逃げ面が設けられ、この主切刃第１逃げ面は、逃げ
角が副切刃側から他方のコーナー方向に向けて副切刃逃
げ面の逃げ角から次第に小さくなるように設定されてい
るから、直角削りができると共に、特に主切刃部分の刃
先強度を大きくすることができて、チップ寿命を大幅に
向上させることができる。又、本発明に係るスローアウ
ェイチップは、切欠が設けられているから、切削時に切
込み用の副切刃が摩耗しても副切刃の幅が増大するのを
抑制できて、面圧が増大するのを抑えて、びびり振動の
発生や主切刃の摩耗を抑制できる。この点からもチップ
寿命の向上に寄与することになる。又、上面の稜線部に
ランドが設けられているから、切刃強度を高めてチップ
寿命を向上できる。The throw-away tip according to the present invention is
A sub-cutting edge is provided near one corner of the ridge between two corners, a main cutting edge extending toward the other corner is provided, and a side surface intersecting with the sub-cutting edge has a positive clearance angle. A secondary cutting edge flank is provided, and a small-width main cutting edge first flank extending along the main cutting edge is provided at the upper portion of the side surface intersecting with the main cutting edge. Is designed so that the clearance angle gradually decreases from the clearance angle of the secondary cutting edge flank toward the other corner direction from the clearance angle of the secondary cutting edge flank. The strength can be increased and the life of the chip can be significantly improved. Further, since the throw-away tip according to the present invention is provided with the notch, it is possible to suppress an increase in the width of the sub-cutting edge even if the sub-cutting edge for cutting is worn during cutting, and increase the surface pressure. It is possible to suppress chattering and to prevent chatter vibration and wear of the main cutting edge. This point also contributes to the improvement of the chip life. Further, since the land is provided on the ridge line portion of the upper surface, the cutting edge strength can be increased and the chip life can be improved.
【図１】本発明の第一実施例によるスローアウェイチッ
プの平面図である。FIG. 1 is a plan view of a throw-away tip according to a first embodiment of the present invention.
【図２】第１図に示すスローアウェイチップの側面図で
ある。FIG. 2 is a side view of the throw-away tip shown in FIG.
【図３】図２のＸ−Ｘ線部分断面図である。FIG. 3 is a partial sectional view taken along line XX of FIG.
【図４】図１のＡ部拡大図である。FIG. 4 is an enlarged view of part A in FIG.
【図５】第一実施例によるスローアウェイチップをカッ
タに装着した状態の一部破断側面である。FIG. 5 is a partially cutaway side view of the throw-away tip according to the first embodiment mounted on a cutter.
【図６】図５と別の角度からみたスローアウェイチップ
をカッタに装着した状態の側面図である。FIG. 6 is a side view showing a state where the throw-away tip is attached to the cutter as viewed from a different angle from FIG.
【図７】図６に示すカッタの正面図である。FIG. 7 is a front view of the cutter shown in FIG.
【図８】本発明の第二実施例によるスローアウェイチッ
プの平面図である。FIG. 8 is a plan view of a throw-away tip according to a second embodiment of the present invention.
【図９】図８のＹ−Ｙ線断面図である。9 is a sectional view taken along line YY of FIG.
【図１０】図８のＢ部拡大図である。10 is an enlarged view of part B in FIG.
【図１１】図９のＣ部拡大図である。FIG. 11 is an enlarged view of a C portion of FIG.
【図１２】本発明の第三実施例によるスローアウェイチ
ップの平面図である。FIG. 12 is a plan view of a throw-away tip according to a third embodiment of the present invention.
【図１３】図１２に示すスローアウェイチップの側面図
である。FIG. 13 is a side view of the throw-away tip shown in FIG.
【図１４】図１２のＤ部拡大図である。14 is an enlarged view of part D in FIG.
【図１５】スローアウェイチップの副切刃による被削材
切削状態を示す部分拡大図である。FIG. 15 is a partially enlarged view showing a work material cutting state by the auxiliary cutting edge of the throw-away tip.
【図１６】本発明の第四実施例によるスローアウェイチ
ップの平面図である。FIG. 16 is a plan view of a throw-away tip according to a fourth embodiment of the present invention.
【図１７】図１６のＥ部拡大図である。FIG. 17 is an enlarged view of part E in FIG.
【図１８】切り欠けの変形例を示す図１４と同様な図で
ある。FIG. 18 is a view similar to FIG. 14 showing a modification of the notch.
【図１９】切り欠けの別の変形例を示す図１４と同様な
図である。FIG. 19 is a view similar to FIG. 14 showing another modification of the notch.
【図２０】従来のスローアウェイチップの斜視図であ
る。FIG. 20 is a perspective view of a conventional throw-away tip.
【図２１】従来のスローアウェイチップが装着されたカ
ッタによる直角削り状態を示す断面図である。FIG. 21 is a cross-sectional view showing a state where a conventional throw-away tip is mounted on the cutter at a right angle.
１…フライスカッタ、１０…スローアウェイチップ、１
１…下面、１２…上面、１３…主切刃、１４…副切刃、
１８…側面、１９…副切刃逃げ面、２０…主切刃第１逃
げ面、２２…主切刃第２逃げ面、２５…ランド、２８…
ブレーカ溝、３１，３６，３７…切り欠け。1 ... Milling cutter, 10 ... Throw-away tip, 1
1 ... Lower surface, 12 ... Upper surface, 13 ... Main cutting edge, 14 ... Sub cutting edge,
18 ... Side surface, 19 ... Secondary cutting edge flank surface, 20 ... Main cutting edge first flank surface, 22 ... Main cutting edge second flank surface, 25 ... Land, 28 ...
Breaker groove, 31, 36, 37 ... Notch.
Claims (11)
上面の稜線部が切刃をなすと共に上面がすくい面とさ
れ、着座面から上面に向けて外側に傾斜する側面が逃げ
面とされているスローアウェイチップにおいて、 二つのコーナー間の前記稜線部の一方のコーナー寄りに
副切刃が設けられ、該副切刃に対して他方のコーナーに
向けて延びる主切刃が設けられ、 前記副切刃に交差する前記側面にはポジティブな逃げ角
を有する副切刃逃げ面が設けられ、 前記主切刃に交差する前記側面上部には、前記主切刃に
沿って延在する小幅の主切刃第１逃げ面が設けられ、該
主切刃第１逃げ面は、逃げ角が前記副切刃側から他方の
コーナー方向に向けて前記副切刃逃げ面の逃げ角から次
第に小さくなるように設定されていることを特徴とする
スローアウェイチップ。1. A polygonal plate shape, a ridge line portion of an upper surface facing a seating surface forms a cutting edge and the upper surface is a rake surface, and a side surface inclined outward from the seating surface toward the upper surface is a flank surface. In the throw away tip that is said to be, a sub cutting edge is provided near one corner of the ridge line portion between two corners, and a main cutting edge that extends toward the other corner is provided with respect to the sub cutting edge. A sub-cutting edge flank having a positive clearance angle is provided on the side surface intersecting the sub-cutting edge, and the side surface upper portion intersecting the main cutting edge extends along the main cutting edge. A small-width main cutting edge first flank is provided, and the main cutting edge first flank has a clearance angle gradually increasing from the clearance angle of the sub-cutting edge flank toward the other corner direction from the sub-cutting edge side. Throw-away characterized by being set to be small Ichip.
上面の内側寄りに傾斜して設けられていることを特徴と
する請求項１に記載のスローアウェイチップ。2. The throw-away tip according to claim 1, wherein the auxiliary cutting edge is inclined toward the inner side of the upper surface by a slight angle with respect to the main cutting edge.
側から他方のコーナー方向に向けてポジティブからネガ
ティブに次第に変化して設定されていることを特徴とす
る請求項１または２に記載のスローアウェイチップ。3. The clearance angle of the first flank of the main cutting edge is set to gradually change from positive to negative in the direction of the other corner from the side of the secondary cutting edge. Or the throw-away tip described in 2.
座面から副切刃に向けて外側に傾斜して延びる平坦面と
されていることを特徴とする請求項１乃至３のいずれか
に記載のスローアウェイチップ。4. The auxiliary cutting edge flank surface is a flat surface extending from the seating surface to the auxiliary cutting edge so as to incline outwardly on the side surface. Throw-away tip described in.
いて、主切刃第１逃げ面と副切刃逃げ面との間に、副切
刃逃げ面より逃げ角が小さい主切刃第２逃げ面が形成さ
れていることを特徴とする請求項４に記載のスローアウ
ェイチップ。5. A main cutting edge having a clearance angle smaller than that of the sub cutting edge flank between the main cutting edge first flank and the sub cutting edge flank in the area forming the flank of the main cutting edge on the side surface. The throw-away tip according to claim 4, wherein a second flank is formed.
記稜線部にそれぞれ設けられた前記主切刃は、互いにほ
ぼ直角になっていることを特徴とする請求項１乃至５の
いずれかに記載のスローアウェイチップ。6. The main cutting edge provided on each of the two ridge portions sandwiching a corner on the upper surface is substantially orthogonal to each other, according to claim 1. Throw-away tip.
欠が設けられていることを特徴とする請求項１乃至６の
いずれかに記載のスローアウェイチップ。7. The throw-away tip according to claim 1, wherein a notch is provided at a ridge line portion of a boundary between the auxiliary cutting edge and the main cutting edge.
面と側面を切り欠いて形成されていることを特徴とする
請求項７に記載のスローアウェイチップ。8. The throw-away tip according to claim 7, wherein the notch is formed in an arc shape or a polygonal shape by notching the upper surface and the side surface.
ることを特徴とする請求項１乃至８のいずれかに記載の
スローアウェイチップ。9. The throw-away tip according to any one of claims 1 to 8, wherein a land is provided on the ridge portion of the upper surface.
設けられていることを特徴とする請求項９に記載のスロ
ーアウェイチップ。10. The throw-away tip according to claim 9, wherein a breaker groove is provided inside the land on the upper surface.
が、ラジアルレーキ角がネガティブになると共に、アキ
シャルレーキ角がポジティブとなるように装着されてな
る切削工具において、前記スローアウェイチップは請求
項１乃至１０のいずれかに記載のスローアウェイチップ
であることを特徴とする切削工具。11. A cutting tool in which one or a plurality of throw-away tips are mounted so that the radial rake angle becomes negative and the axial rake angle becomes positive, wherein the throw-away tips are provided. A cutting tool characterized by being a throw-away tip according to any one of 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02854294A JP3314512B2 (en) | 1994-02-25 | 1994-02-25 | Indexable tip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02854294A JP3314512B2 (en) | 1994-02-25 | 1994-02-25 | Indexable tip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07237025A true JPH07237025A (en) | 1995-09-12 |
| JP3314512B2 JP3314512B2 (en) | 2002-08-12 |
Family
ID=12251558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02854294A Expired - Lifetime JP3314512B2 (en) | 1994-02-25 | 1994-02-25 | Indexable tip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3314512B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007125669A (en) * | 2005-11-07 | 2007-05-24 | Sumitomo Electric Hardmetal Corp | Cutting edge replaceable tip and cutting edge replaceable corner grinding milling cutter |
| WO2008136426A1 (en) * | 2007-04-26 | 2008-11-13 | Kyocera Corporation | Cutting insert, cutting tool, and cutting method using the same |
| JP5159773B2 (en) * | 2007-05-28 | 2013-03-13 | 京セラ株式会社 | Cutting insert, cutting tool, and cutting method using the same |
| US8434974B2 (en) * | 2005-11-15 | 2013-05-07 | Kennametal Inc. | Milling cutter and a cutting insert therefor |
| WO2013119036A1 (en) * | 2012-02-08 | 2013-08-15 | Taegutec Ltd. | Cutting insert having eight main cutting edges and eight wiper edges and cutting tool including the same |
| WO2016033620A1 (en) * | 2014-09-03 | 2016-03-10 | Ceratizit Austria Gesellschaft M.B.H. | Double-sided cutting insert and milling tool |
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| CN110087808B (en) * | 2017-11-02 | 2020-07-14 | 三菱日立工具株式会社 | Cutting insert and indexable cutting tool |
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1994
- 1994-02-25 JP JP02854294A patent/JP3314512B2/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4491404B2 (en) * | 2005-11-07 | 2010-06-30 | 住友電工ハードメタル株式会社 | Tip changeable insert and tip changeable corner milling cutter |
| JP2007125669A (en) * | 2005-11-07 | 2007-05-24 | Sumitomo Electric Hardmetal Corp | Cutting edge replaceable tip and cutting edge replaceable corner grinding milling cutter |
| US8434974B2 (en) * | 2005-11-15 | 2013-05-07 | Kennametal Inc. | Milling cutter and a cutting insert therefor |
| US8740510B2 (en) | 2007-04-26 | 2014-06-03 | Kyocera Corporation | Cutting insert and cutting tool, and cutting method using the same |
| WO2008136426A1 (en) * | 2007-04-26 | 2008-11-13 | Kyocera Corporation | Cutting insert, cutting tool, and cutting method using the same |
| JP5159773B2 (en) * | 2007-05-28 | 2013-03-13 | 京セラ株式会社 | Cutting insert, cutting tool, and cutting method using the same |
| WO2013119036A1 (en) * | 2012-02-08 | 2013-08-15 | Taegutec Ltd. | Cutting insert having eight main cutting edges and eight wiper edges and cutting tool including the same |
| KR101431891B1 (en) * | 2012-02-08 | 2014-08-26 | 대구텍 유한회사 | A cutting insert having eight main cutting edges and wiper edges and a cutting tool having the same |
| US9724770B2 (en) | 2012-02-08 | 2017-08-08 | Taegutec Ltd. | Cutting insert having eight main cutting edges and eight wiper edges and cutting tool including the same |
| DE112013000894B4 (en) | 2012-02-08 | 2023-02-16 | Taegutec Ltd. | Cutting insert having eight major cutting edges and eight finishing edges and cutting tool incorporating same |
| WO2016033620A1 (en) * | 2014-09-03 | 2016-03-10 | Ceratizit Austria Gesellschaft M.B.H. | Double-sided cutting insert and milling tool |
| CN106687239A (en) * | 2014-09-03 | 2017-05-17 | 森拉天时奥地利有限公司 | Double-sided cutting insert and milling tool |
| RU2662752C1 (en) * | 2014-09-03 | 2018-07-30 | Цератицит Аустриа Гезельшафт М.Б.Х. | Double-sided milling grade and milling tool |
| US10144070B2 (en) | 2014-09-03 | 2018-12-04 | Ceratizit Austria Gesellschaft M.B.H. | Double-sided cutting insert and milling tool |
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| Publication number | Publication date |
|---|---|
| JP3314512B2 (en) | 2002-08-12 |
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