JP2022022312A - Diamond coating tool - Google Patents

Diamond coating tool Download PDF

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JP2022022312A
JP2022022312A JP2021196007A JP2021196007A JP2022022312A JP 2022022312 A JP2022022312 A JP 2022022312A JP 2021196007 A JP2021196007 A JP 2021196007A JP 2021196007 A JP2021196007 A JP 2021196007A JP 2022022312 A JP2022022312 A JP 2022022312A
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flank
rake
diamond coating
tool
base material
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JP7222561B2 (en
JP2022022312A5 (en
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英二 社本
Eiji Shamoto
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Tokai National Higher Education and Research System NUC
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Tokai National Higher Education and Research System NUC
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Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of suppressing peeling of a diamond coating layer from a tool base material.
SOLUTION: In a diamond coating tool 3, a flank 20 of a tool base material 1 includes a first flank 21 linked to a tooth point 2, a second flank 23 positioned separately from the tooth point 2 furthermore than the first flank 21, and positioned on the outside furthermore than the first flank as a view from the tool base material inside, and a flank side step part 22 for connecting the first flank 21 to the second flank 23. A diamond coating layer 30 is formed on the first flank 21 and the flank side step part 22.
SELECTED DRAWING: Figure 4
COPYRIGHT: (C)2022,JPO&INPIT

Description

本開示は、工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具に関する。 The present disclosure relates to a diamond-coated tool in which a tool base material is coated with diamond.

従来、セラミックスや超硬合金、ＣＦＲＰ（炭素繊維強化プラスチック）などの硬質材料の切削加工に、超硬合金製インサート母材をダイヤモンドコーティングした工具が使用されている。これらの硬質材料の切削加工には単結晶ダイヤモンド工具や多結晶ダイヤモンド工具も使用されるが、高コストとなるため、ダイヤモンドコーティング工具はコスト面で大きなメリットを有する。 Conventionally, a tool in which a cemented carbide insert base material is diamond-coated has been used for cutting hard materials such as ceramics, cemented carbide, and CFRP (carbon fiber reinforced plastic). Single crystal diamond tools and polycrystalline diamond tools are also used for cutting these hard materials, but diamond coating tools have a great cost advantage because of their high cost.

特許文献１は、チップ母材にダイヤモンドをコーティングしたスローアウェイチップを開示する。このスローアウェイチップでは、コーティングしたすくい面をクランプ手段で抑える際にコーティング層の刃先を損傷しないように、チップ母材のすくい面において、刃先近傍の部位を、すくい面の中央部位より段下がり状に低く形成している。 Patent Document 1 discloses a throw-away chip in which a chip base material is coated with diamond. In this throw-away insert, the portion near the blade edge on the rake face of the chip base material is stepped down from the center part of the rake surface so that the cutting edge of the coating layer is not damaged when the coated rake surface is clamped by the clamping means. It is formed low.

特開平６－３３５８０６号公報Japanese Unexamined Patent Publication No. 6-335806

図１は、従来のダイヤモンドコーティング工具５０の刃先周辺の構造を示す。ダイヤモンドコーティング工具５０は、超硬合金製の工具母材５１の刃先５３の近傍にダイヤモンドをコーティングすることで作製され、ダイヤモンド被覆層５２が工具母材５１の刃先５３、すくい面５４および逃げ面５５に形成される。図１においてＸ軸方向は、ダイヤモンドコーティング工具５０による切削工程における切取り厚さ方向を、Ｙ軸方向は、切削工程における切削方向を示す。 FIG. 1 shows the structure around the cutting edge of a conventional diamond coating tool 50. The diamond coating tool 50 is manufactured by coating diamond in the vicinity of the cutting edge 53 of the tool base material 51 made of cemented carbide, and the diamond coating layer 52 is formed by coating the cutting edge 53, the rake surface 54, and the flank surface 55 of the tool base material 51. Is formed in. In FIG. 1, the X-axis direction indicates the cutting thickness direction in the cutting process by the diamond coating tool 50, and the Y-axis direction indicates the cutting direction in the cutting process.

ダイヤモンドコーティング工具５０における工具母材５１とダイヤモンド被覆層５２との密着性は高くなく、被削材が非常に高硬度である場合や刃先の損耗が進んで切削力が増大した場合に、工具母材５１からダイヤモンド被覆層５２が剥離しやすいという課題がある。この課題を解決するため、超硬合金の成分を調整（たとえば結合剤であるＣｏの割合を減少する）したり、母材表面の粗さを増大してアンカー効果を生じさせるなどの対策が講じられているが、十分な解決策にはなっておらず、依然として剥離の問題が残っている。 The adhesion between the tool base material 51 and the diamond coating layer 52 in the diamond coating tool 50 is not high, and the tool base increases when the work material has extremely high hardness or when the cutting edge wears and the cutting force increases. There is a problem that the diamond coating layer 52 is easily peeled off from the material 51. In order to solve this problem, measures are taken such as adjusting the composition of the cemented carbide (for example, reducing the proportion of Co, which is a binder), and increasing the roughness of the surface of the base metal to create an anchor effect. However, it has not been a sufficient solution, and the problem of peeling still remains.

本開示はこうした状況に鑑みてなされており、ダイヤモンドコーティング工具においてダイヤモンド被覆層が工具母材から剥離することを抑制する構造を提供することにある。 The present disclosure has been made in view of such circumstances, and an object of the present invention is to provide a structure for suppressing peeling of a diamond coating layer from a tool base material in a diamond coating tool.

上記課題を解決するために、本開示のある態様は、すくい面と、逃げ面と、すくい面と逃げ面の境界をなす刃先とを有する工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具に関する。この態様のダイヤモンドコーティング工具において、工具母材の逃げ面は、刃先に連なる第１逃げ面と、第１逃げ面よりも刃先から離れた位置にあり且つ工具母材内部から見て第１逃げ面よりも外側に位置する第２逃げ面と、第１逃げ面と第２逃げ面とを接続する逃げ面側段差部とを備える。ダイヤモンド被覆層は、刃先、第１逃げ面および逃げ面側段差部に形成される。 In order to solve the above problems, one aspect of the present disclosure relates to a diamond coating tool in which a tool base material having a rake face, a flank surface, and a cutting edge forming a boundary between the rake face and the flank surface is coated with diamond. In the diamond-coated tool of this embodiment, the flanks of the tool base material are the first flank surface connected to the cutting edge and the first flank surface which is located at a position away from the cutting edge from the first flank surface and when viewed from the inside of the tool base material. It is provided with a second flank located on the outer side and a step portion on the flank side connecting the first flank and the second flank. The diamond coating layer is formed on the cutting edge, the first flank surface, and the step portion on the flank surface side.

本開示の別の態様は、すくい面と、逃げ面と、すくい面と逃げ面の境界をなす刃先とを有する工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具に関する。この態様のダイヤモンドコーティング工具において、工具母材のすくい面は、刃先に連なる第１すくい面と、第１すくい面よりも刃先から離れた位置にあり且つ工具母材内部から見て第１すくい面よりも外側に位置する第２すくい面と、第１すくい面と第２すくい面とを接続するすくい面側段差部とを備える。ダイヤモンド被覆層は、第１すくい面およびすくい面側段差部に形成され、ダイヤモンドコーティング工具のすくい面は平坦に構成される。 Another aspect of the present disclosure relates to a diamond-coated tool in which a tool base material having a rake face, a flank surface, and a cutting edge forming a boundary between the rake face and the flank surface is coated with diamond. In the diamond-coated tool of this embodiment, the rake face of the tool base material is a first rake surface connected to the cutting edge and a position farther from the cutting edge than the first rake surface and the first rake surface when viewed from the inside of the tool base material. It is provided with a second rake face located outside the rake face and a rake face side step portion connecting the first rake face and the second rake face. The diamond coating layer is formed on the first rake surface and the step portion on the rake surface side, and the rake surface of the diamond coating tool is formed flat.

本開示によれば、ダイヤモンドコーティング工具においてダイヤモンド被覆層が工具母材から剥離することを抑制する構造を提供できる。 According to the present disclosure, it is possible to provide a structure for suppressing the diamond coating layer from peeling from the tool base material in a diamond coating tool.

従来のダイヤモンドコーティング工具の刃先周辺の構造を示す図である。It is a figure which shows the structure around the cutting edge of the conventional diamond coating tool. 実施形態の工具母材の形状を示す図である。It is a figure which shows the shape of the tool base material of an embodiment. 逃げ面側段差部の断面を拡大した図である。It is the figure which enlarged the cross section of the step portion on the flank side. ダイヤモンドコーティング工具の構造を示す図である。It is a figure which shows the structure of a diamond coating tool. ダイヤモンドコーティング工具の構造の別の例を示す図である。It is a figure which shows another example of the structure of a diamond coating tool. ダイヤモンドコーティング工具の構造の別の例を示す図である。It is a figure which shows another example of the structure of a diamond coating tool.

以下、実施形態のダイヤモンドコーティング工具について説明する。
図２は、実施形態の工具母材１の形状を示す。工具母材１は、すくい面１０と、逃げ面２０と、すくい面１０と逃げ面２０の境界をなす刃先２とを有する。ダイヤモンドコーティング工具は、工具母材１の刃先２の近傍にダイヤモンドをコーティングすることで作製される。 Hereinafter, the diamond coating tool of the embodiment will be described.
FIG. 2 shows the shape of the tool base material 1 of the embodiment. The tool base material 1 has a rake face 10, a flank surface 20, and a cutting edge 2 forming a boundary between the rake face 10 and the flank surface 20. The diamond coating tool is manufactured by coating diamond in the vicinity of the cutting edge 2 of the tool base material 1.

工具母材１の逃げ面２０は、刃先２に連なる第１逃げ面２１と、第１逃げ面２１よりも刃先２から離れた位置にある第２逃げ面２３と、第１逃げ面２１と第２逃げ面２３とを接続する逃げ面側段差部２２とを備える。工具母材１の内部から見て、第２逃げ面２３は第１逃げ面２１よりも外側に位置する。換言すると、工具母材１の内部から第１逃げ面２１と第２逃げ面２３とをそれぞれ直交する方向に見た場合に、第２逃げ面２３は、第１逃げ面２１よりも刃物の厚みを増やす側に位置する。第１逃げ面２１および第２逃げ面２３は平坦面として形成され、実質的に平行であってよい。たとえば第１逃げ面２１および逃げ面側段差部２２は、刃先まで平坦面を構成していた第２逃げ面２３を切り欠くことで形成されてよい。 The flanks 20 of the tool base material 1 include a first flank 21 connected to the cutting edge 2, a second flank 23 located farther from the first flank 21 than the first flank 21, and a first flank 21 and a second flank. (2) A flank side step portion 22 for connecting the flank 23 is provided. The second flank 23 is located outside the first flank 21 when viewed from the inside of the tool base material 1. In other words, when the first flank surface 21 and the second flank surface 23 are viewed in orthogonal directions from the inside of the tool base material 1, the second flank surface 23 is thicker than the first flank surface 21. Is located on the side of increasing. The first flank 21 and the second flank 23 are formed as flat surfaces and may be substantially parallel. For example, the first flank surface 21 and the flank side step portion 22 may be formed by cutting out the second flank surface 23 that has formed a flat surface up to the cutting edge.

工具母材１のすくい面１０は、刃先２に連なる第１すくい面１１と、第１すくい面１１よりも刃先２から離れた位置にある第２すくい面１３と、第１すくい面１１と第２すくい面１３とを接続するすくい面側段差部１２とを備える。工具母材１の内部から見て、第２すくい面１３は第１すくい面１１よりも外側に位置する。換言すると、工具母材１の内部から第１すくい面１１と第２すくい面１３とをそれぞれ直交する方向に見た場合に、第２すくい面１３は、第１すくい面１１よりも刃物の厚みを増やす側に位置する。第１すくい面１１および第２すくい面１３は平坦面として形成され、実質的に平行であってよい。たとえば第１すくい面１１およびすくい面側段差部１２は、刃先まで平坦面を構成していた第２すくい面１３を切り欠くことで形成されてよい。 The rake face 10 of the tool base material 1 includes a first rake surface 11 connected to the cutting edge 2, a second rake surface 13 located at a position farther from the cutting edge 2 than the first rake surface 11, and a first rake surface 11 and a first rake surface 11. 2 The rake face side step portion 12 for connecting to the rake face 13 is provided. The second rake face 13 is located outside the first rake face 11 when viewed from the inside of the tool base material 1. In other words, when the first rake surface 11 and the second rake surface 13 are viewed in orthogonal directions from the inside of the tool base material 1, the second rake surface 13 has a thickness of the blade more than the first rake surface 11. Is located on the side of increasing. The first rake face 11 and the second rake face 13 are formed as flat surfaces and may be substantially parallel. For example, the first rake face 11 and the step portion 12 on the rake face side may be formed by cutting out the second rake face 13 that constitutes a flat surface up to the cutting edge.

図３は、逃げ面側段差部の断面を拡大した図である。図示のように、逃げ面側段差部２２と第１逃げ面２１との境界Ｐ、逃げ面側段差部２２と第２逃げ面２３との境界Ｑを定義する。逃げ面側段差部２２の傾斜面は、境界Ｐと境界Ｑを繋ぐ平面であってもよいが、図３に示すように、工具母材１の外部から見て、境界Ｐと境界Ｑを繋ぐ平面よりも奥側に位置してよい（つまり工具母材１の外部から見て、境界Ｐと境界Ｑを繋ぐ平面に対して、逃げ面側段差部２２の傾斜面が凹部を形成してよい）。 FIG. 3 is an enlarged view of the cross section of the step portion on the flank side. As shown in the figure, a boundary P between the flank side step portion 22 and the first flank surface 21 and a boundary Q between the flank side step portion 22 and the second flank surface 23 are defined. The inclined surface of the step portion 22 on the flank side may be a plane connecting the boundary P and the boundary Q, but as shown in FIG. 3, the boundary P and the boundary Q are connected when viewed from the outside of the tool base material 1. It may be located on the back side of the plane (that is, the inclined surface of the flank side step portion 22 may form a recess with respect to the plane connecting the boundary P and the boundary Q when viewed from the outside of the tool base material 1. ).

第１逃げ面２１を工具母材１内部に延長した仮想面に、境界Ｑから垂線を下ろしたときの交点をＲとすると、境界Ｐと交点Ｒとの間の距離Ｗは、境界Ｑと交点Ｒとの間の距離Ｈ以下であることが好ましい。つまり図３において、線分ＰＲと線分ＰＱのなす角度が４５度以上となることが好ましい。また逃げ面側段差部２２の傾斜面が境界Ｐと境界Ｑを繋ぐ平面に対して凹部を形成する場合に、線分ＰＲと凹形状の境界Ｑに近い側での接線がなす角度が約９０度となることが好ましい。なお境界Ｐは交点Ｒ近傍に位置して、線分ＰＲと線分ＰＱのなす角度が約９０度となり、逃げ面側段差部２２が、第１逃げ面２１に対して略垂直な壁面として構成されてもよい。 Assuming that the intersection point when the perpendicular line is drawn from the boundary Q on the virtual surface extending the first flank surface 21 inside the tool base material 1 is R, the distance W between the boundary P and the intersection point R is the intersection point with the boundary Q. It is preferable that the distance from R is H or less. That is, in FIG. 3, it is preferable that the angle formed by the line segment PR and the line segment PQ is 45 degrees or more. Further, when the inclined surface of the step portion 22 on the flank surface side forms a recess with respect to the plane connecting the boundary P and the boundary Q, the angle formed by the tangent line on the side close to the boundary Q of the line segment PR and the concave shape is about 90. It is preferable to be a right angle. The boundary P is located near the intersection R, the angle formed by the line segment PR and the line segment PQ is about 90 degrees, and the flank side step portion 22 is configured as a wall surface substantially perpendicular to the first flank surface 21. May be done.

なお図３は、逃げ面２０に形成された逃げ面側段差部２２の構造を示すが、すくい面１０に形成されたすくい面側段差部１２も、図３に示す逃げ面側段差部２２と同一の構造を有してよい。 Note that FIG. 3 shows the structure of the flank side step portion 22 formed on the flank surface 20, but the rake face side step portion 12 formed on the rake surface 10 also has the flank side step portion 22 shown in FIG. It may have the same structure.

図４は、工具母材１にダイヤモンドをコーティングしたダイヤモンドコーティング工具３の構造を示す。ダイヤモンド被覆層３０は、工具母材１の刃先２、すくい面１０および逃げ面２０に形成される。工具母材１の刃先２には、層厚程度の半径をもつ切れ刃部３１が形成される。ダイヤモンド被覆層３０の層厚は、距離Ｈ（図３参照）以下であることが好ましい。図４においてＸ軸方向は、ダイヤモンドコーティング工具３による切削工程における切取り厚さ方向を、Ｙ軸方向は、切削工程における切削方向を示す。 FIG. 4 shows the structure of the diamond coating tool 3 in which the tool base material 1 is coated with diamond. The diamond coating layer 30 is formed on the cutting edge 2, the rake face 10, and the flank surface 20 of the tool base material 1. A cutting edge portion 31 having a radius of about the layer thickness is formed on the cutting edge 2 of the tool base material 1. The layer thickness of the diamond coating layer 30 is preferably a distance H (see FIG. 3) or less. In FIG. 4, the X-axis direction indicates the cutting thickness direction in the cutting process by the diamond coating tool 3, and the Y-axis direction indicates the cutting direction in the cutting process.

逃げ面２０において、ダイヤモンド被覆層３０は、少なくとも第１逃げ面２１および逃げ面側段差部２２に形成される。ここで第１逃げ面２１および逃げ面側段差部２２にダイヤモンド被覆層３０が形成されることは、第１逃げ面２１および逃げ面側段差部２２にダイヤモンド被覆層３０が密着することを意味する。 In the flank 20, the diamond coating layer 30 is formed on at least the first flank 21 and the flank side step portion 22. Here, the formation of the diamond coating layer 30 on the first flank surface 21 and the flank side step portion 22 means that the diamond coating layer 30 is in close contact with the first flank surface 21 and the flank side step portion 22. ..

ダイヤモンドコーティング工具３を用いた切削工程中、切れ刃部３１が被削材から切削力を受けると、逃げ面２０に形成されたダイヤモンド被覆層３０は、第１逃げ面２１の延在方向に切削力による剪断荷重を受ける。このとき逃げ面側段差部２２は、ダイヤモンド被覆層３０に作用する剪断荷重を受け止めることで、第１逃げ面２１とダイヤモンド被覆層３０との剪断剥離を抑制する剥離抑制構造として機能する。 When the cutting edge portion 31 receives a cutting force from the work material during the cutting process using the diamond coating tool 3, the diamond coating layer 30 formed on the flank surface 20 cuts in the extending direction of the first flank surface 21. Receives shear load due to force. At this time, the flank side step portion 22 functions as a peeling suppression structure that suppresses shear peeling between the first flank surface 21 and the diamond coating layer 30 by receiving the shear load acting on the diamond coating layer 30.

すくい面１０において、ダイヤモンド被覆層３０は、少なくとも第１すくい面１１およびすくい面側段差部１２に形成される。ここで第１すくい面１１およびすくい面側段差部１２にダイヤモンド被覆層３０が形成されることは、第１すくい面１１およびすくい面側段差部１２にダイヤモンド被覆層３０が密着することを意味する。 On the rake face 10, the diamond coating layer 30 is formed on at least the first rake face 11 and the rake face side step portion 12. Here, the formation of the diamond coating layer 30 on the first rake surface 11 and the rake surface side step portion 12 means that the diamond coating layer 30 is in close contact with the first rake surface 11 and the rake surface side step portion 12. ..

ダイヤモンドコーティング工具３を用いた切削工程中、すくい面１０に形成されたダイヤモンド被覆層３０は、第１すくい面１１の延在方向に切削力による剪断荷重を受ける。このとき、すくい面側段差部１２は、ダイヤモンド被覆層３０に作用する剪断荷重を受け止めることで、第１すくい面１１とダイヤモンド被覆層３０との剪断剥離を抑制する剥離抑制構造として機能する。 During the cutting process using the diamond coating tool 3, the diamond coating layer 30 formed on the rake face 10 receives a shear load due to the cutting force in the extending direction of the first rake face 11. At this time, the rake face side step portion 12 functions as a peeling suppression structure that suppresses shear peeling between the first rake face 11 and the diamond coating layer 30 by receiving the shear load acting on the diamond coating layer 30.

なお高硬度な被削材を切削する際、刃先強度の問題から、通常は、コーティング層の厚みより小さな（つまり一般のコーティング工具では刃先の丸み半径より小さな）切取り厚さで加工することが行われる。このような切削加工では実質的なすくい角は刃先の丸み半径と切取り厚さによって決まることが多いが、実施形態のダイヤモンドコーティング工具３は、設定上のすくい角が負の角度となるように形成されてよい。設定上のすくい角が正の角度である場合（図１参照）、切れ刃部３１にかかる切削力の方向とすくい面１０の延在方向が近いため、切削力による剪断荷重は大きくなる。一方、設定上のすくい角が負の角度になると、切削力の方向と、すくい面１０の延在方向の角度の開きが大きくなることから、切削力による剪断荷重は小さくなる。そのため実施形態のダイヤモンドコーティング工具３では、工具母材１の刃先角度（刃物角度）を９０度以上とすることで、設定上のすくい角を負にして、すくい面１０と平行にダイヤモンド被覆層３０と工具母材１の間にかかる剪断荷重を小さくしている。 When cutting a high-hardness work material, due to the problem of cutting edge strength, it is usually performed with a cutting thickness smaller than the thickness of the coating layer (that is, smaller than the rounding radius of the cutting edge with general coating tools). Will be. In such cutting, the actual rake angle is often determined by the roundness radius of the cutting edge and the cutting thickness, but the diamond coating tool 3 of the embodiment is formed so that the rake angle on the setting is a negative angle. May be done. When the rake angle on the setting is a positive angle (see FIG. 1), the direction of the cutting force applied to the cutting edge portion 31 and the extending direction of the rake face 10 are close to each other, so that the shear load due to the cutting force becomes large. On the other hand, when the rake angle on the setting becomes a negative angle, the difference between the angle between the direction of the cutting force and the extending direction of the rake face 10 becomes large, so that the shear load due to the cutting force becomes small. Therefore, in the diamond coating tool 3 of the embodiment, by setting the cutting edge angle (blade angle) of the tool base material 1 to 90 degrees or more, the rake angle on the setting is made negative, and the diamond coating layer 30 is parallel to the rake surface 10. The shear load applied between the tool base material 1 and the tool base material 1 is reduced.

実施形態のダイヤモンドコーティング工具３において、剥離抑制構造は、少なくとも逃げ面２０側に設けられる。逃げ面２０側に剥離抑制構造を設けることで、逃げ面２０におけるダイヤモンド被覆層３０の剪断剥離を抑制できる。剥離抑制構造が逃げ面２０側のみに設けられる場合、上記したように、設定上のすくい角が負の角度となるようにダイヤモンドコーティング工具３が使用されることが好ましい。なお剥離抑制構造は、すくい面１０側にも設けられてよい。 In the diamond coating tool 3 of the embodiment, the peeling suppressing structure is provided at least on the flank surface 20 side. By providing the peeling suppression structure on the flank 20 side, shear peeling of the diamond coating layer 30 on the flank 20 can be suppressed. When the peeling suppressing structure is provided only on the flank 20 side, it is preferable to use the diamond coating tool 3 so that the rake angle on the setting is a negative angle as described above. The peeling suppressing structure may also be provided on the rake face 10 side.

図５は、ダイヤモンドコーティング工具３の構造の別の例を示す。ダイヤモンド被覆層３０は、工具母材１の刃先２、すくい面１０および逃げ面２０に形成される。図５においてＸ軸方向は、ダイヤモンドコーティング工具３による切削工程における切取り厚さ方向を、Ｙ軸方向は、切削工程における切削方向を示す。 FIG. 5 shows another example of the structure of the diamond coating tool 3. The diamond coating layer 30 is formed on the cutting edge 2, the rake face 10, and the flank surface 20 of the tool base material 1. In FIG. 5, the X-axis direction indicates the cutting thickness direction in the cutting process by the diamond coating tool 3, and the Y-axis direction indicates the cutting direction in the cutting process.

逃げ面２０において、ダイヤモンド被覆層３０は、第１逃げ面２１および逃げ面側段差部２２に形成されて、第２逃げ面２３には形成されない。図４を参照して、第２逃げ面２３にダイヤモンドコーティングを施すと、逃げ面側段差部２２と第２逃げ面２３の境界付近で、切取り厚さ方向側に突き出たダイヤモンド被覆層３０の凸部が形成される。この凸部は被削材の仕上げ面に干渉する可能性があるため、図５に示すダイヤモンドコーティング工具３では、第２逃げ面２３にダイヤモンド被覆層３０を設けないことで、凸部が形成されないようにしている。 In the flank 20, the diamond coating layer 30 is formed on the first flank 21 and the flank side step portion 22, and is not formed on the second flank 23. When the diamond coating is applied to the second flank surface 23 with reference to FIG. 4, the convexity of the diamond coating layer 30 protruding in the cut thickness direction side near the boundary between the flank side step portion 22 and the second flank surface 23. The part is formed. Since this convex portion may interfere with the finished surface of the work material, in the diamond coating tool 3 shown in FIG. 5, the convex portion is not formed by not providing the diamond coating layer 30 on the second flank surface 23. I am doing it.

そのためダイヤモンドコーティング工具３の作製工程において、コーティング工程の実施前に、第２逃げ面２３にダイヤモンドがコーティングされないよう所定の前処理を行ってよい。また別の作製手順として、コーティング工程で逃げ面２０にダイヤモンド被覆層３０を形成した後、第２逃げ面２３に形成したダイヤモンド被覆層３０を除去してもよい。この除去工程では、ダイヤモンド被覆層３０が被削材の仕上げ面に干渉しない程度に除去すればよく、第２逃げ面２３に形成したダイヤモンド被覆層３０の全てを除去しなくてもよい。 Therefore, in the manufacturing process of the diamond coating tool 3, a predetermined pretreatment may be performed so that the diamond is not coated on the second flank 23 before the coating step is performed. As another manufacturing procedure, the diamond coating layer 30 formed on the flank surface 20 may be formed in the coating step, and then the diamond coating layer 30 formed on the second flank surface 23 may be removed. In this removal step, the diamond coating layer 30 may be removed to such an extent that it does not interfere with the finished surface of the work material, and it is not necessary to remove all of the diamond coating layer 30 formed on the second flank surface 23.

図６は、ダイヤモンドコーティング工具３の構造の別の例を示す。ダイヤモンド被覆層３０は、工具母材１の刃先２、すくい面１０および逃げ面２０に形成される。図６においてＸ軸方向は、ダイヤモンドコーティング工具３による切削工程における切取り厚さ方向を、Ｙ軸方向は、切削工程における切削方向を示す。 FIG. 6 shows another example of the structure of the diamond coating tool 3. The diamond coating layer 30 is formed on the cutting edge 2, the rake face 10, and the flank surface 20 of the tool base material 1. In FIG. 6, the X-axis direction indicates the cutting thickness direction in the cutting process by the diamond coating tool 3, and the Y-axis direction indicates the cutting direction in the cutting process.

すくい面１０において、ダイヤモンド被覆層３０は、第１すくい面１１およびすくい面側段差部１２に形成されて、第２すくい面１３には形成されない。図５を参照して、第２すくい面１３にダイヤモンドコーティングを施すと、すくい面側段差部１２の付近で、ダイヤモンド被覆層３０が、外側に突き出た形状をもつ。この形状は切屑の流出を妨げる可能性があるため、図６に示すダイヤモンドコーティング工具３では、第２すくい面１３にダイヤモンド被覆層３０を形成せず、第１すくい面１１およびすくい面側段差部１２においてダイヤモンド被覆層３０が第２すくい面１３と平坦になるように形成される。なおダイヤモンド被覆層３０と第２すくい面１３が平坦であるとは、切屑の流出を妨げない程度にダイヤモンド被覆層３０と第２すくい面１３とが繋がっていればよく、実質的に平坦である場合を含む。 On the rake face 10, the diamond coating layer 30 is formed on the first rake face 11 and the rake face side step portion 12, but is not formed on the second rake face 13. When the diamond coating is applied to the second rake face 13 with reference to FIG. 5, the diamond coating layer 30 has a shape protruding outward in the vicinity of the step portion 12 on the rake face side. Since this shape may hinder the outflow of chips, in the diamond coating tool 3 shown in FIG. 6, the diamond coating layer 30 is not formed on the second rake surface 13, and the first rake surface 11 and the rake surface side step portion are not formed. In 12, the diamond coating layer 30 is formed so as to be flat with the second rake face 13. The fact that the diamond coating layer 30 and the second rake surface 13 are flat means that the diamond coating layer 30 and the second rake surface 13 are connected to each other to the extent that the outflow of chips is not hindered, and the diamond coating layer 30 and the second rake surface 13 are substantially flat. Including cases.

ダイヤモンドコーティング工具３の作製工程では、すくい面１０にダイヤモンド被覆層３０を形成した後、ダイヤモンドコーティング工具３のすくい面を平坦に構成するために、ダイヤモンド被覆層３０を除去してよい。このとき図６に示すように、第２すくい面１３に形成したダイヤモンド被覆層３０の全てを除去してもよいが、ダイヤモンド被覆層３０の除去は、ダイヤモンドコーティング工具３のすくい面に、切屑の流出を妨げない平坦面を形成することを目的としているため、第２すくい面１３にダイヤモンド被覆層３０が残存していても構わない。 In the manufacturing process of the diamond coating tool 3, after forming the diamond coating layer 30 on the rake surface 10, the diamond coating layer 30 may be removed in order to form the rake surface of the diamond coating tool 3 flat. At this time, as shown in FIG. 6, all of the diamond coating layer 30 formed on the second rake surface 13 may be removed, but the removal of the diamond coating layer 30 is performed on the rake surface of the diamond coating tool 3 by removing chips. Since the purpose is to form a flat surface that does not hinder the outflow, the diamond coating layer 30 may remain on the second rake surface 13.

以上、本開示を実施形態をもとに説明した。この実施形態は例示であり、それらの各構成要素や各処理プロセスの組合せにいろいろな変形例が可能なこと、またそうした変形例も本開示の範囲にあることは当業者に理解されるところである。 The present disclosure has been described above based on the embodiments. It will be appreciated by those skilled in the art that this embodiment is exemplary and that various modifications are possible for each of these components and combinations of processing processes, and that such variants are also within the scope of the present disclosure. ..

本開示の態様の概要は、次の通りである。本開示のある態様は、すくい面と、逃げ面と、すくい面と逃げ面の境界をなす刃先とを有する工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具に関する。このダイヤモンドコーティング工具において、工具母材の逃げ面は、刃先に連なる（接する）第１逃げ面と、第１逃げ面よりも刃先から離れた位置にあり且つ工具母材内部から見て第１逃げ面よりも外側に位置する第２逃げ面と、第１逃げ面と第２逃げ面とを接続する逃げ面側段差部とを備える。ダイヤモンド被覆層は、刃先、第１逃げ面および逃げ面側段差部に形成されてよい。 The outline of the aspects of the present disclosure is as follows. One aspect of the present disclosure relates to a diamond-coated tool in which a tool base material having a rake face, a flank surface, and a cutting edge forming a boundary between the rake face and the flank surface is coated with diamond. In this diamond-coated tool, the flanks of the tool base material are the first flank that is connected to (contacts) the cutting edge and the first flank that is located away from the cutting edge than the first flank and is viewed from the inside of the tool base. A second flank located outside the surface and a flank side step portion connecting the first flank and the second flank are provided. The diamond coating layer may be formed on the cutting edge, the first flank surface, and the step portion on the flank surface side.

この態様によると、逃げ面側段差部が、剥離抑制構造として機能することで、逃げ面側におけるダイヤモンド被覆層の剥離を抑制できる。 According to this aspect, the flank side step portion functions as a peeling suppressing structure, so that peeling of the diamond coating layer on the flank side can be suppressed.

工具母材のすくい面は、刃先に連なる（接する）第１すくい面と、第１すくい面よりも刃先から離れた位置にあり且つ工具母材内部から見て第１すくい面よりも外側に位置する第２すくい面と、第１すくい面と第２すくい面とを接続するすくい面側段差部とを備える。ダイヤモンド被覆層は、第１すくい面およびすくい面側段差部に形成されてよい。この構造により、すくい面側段差部が、剥離抑制構造として機能することで、すくい面側におけるダイヤモンド被覆層の剥離を抑制できる。 The rake face of the tool base material is located at a position separated from the cutting edge by the first rake surface connected (contacting) with the cutting edge and the first rake surface and outside the first rake surface when viewed from the inside of the tool base material. It is provided with a second rake surface and a rake surface side step portion connecting the first rake surface and the second rake surface. The diamond coating layer may be formed on the first rake face and the step portion on the rake face side. With this structure, the stepped portion on the rake face side functions as a peeling suppressing structure, so that peeling of the diamond coating layer on the rake face side can be suppressed.

本開示の別の態様は、すくい面と、逃げ面と、すくい面と逃げ面の境界をなす刃先とを有する工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具に関する。このダイヤモンドコーティング工具において、工具母材のすくい面は、刃先に連なる（接する）第１すくい面と、第１すくい面よりも刃先から離れた位置にあり且つ工具母材内部から見て第１すくい面よりも外側に位置する第２すくい面と、第１すくい面と第２すくい面とを接続するすくい面側段差部とを備える。ダイヤモンド被覆層は、第１すくい面およびすくい面側段差部に形成され、ダイヤモンドコーティング工具のすくい面は平坦に構成される。 Another aspect of the present disclosure relates to a diamond-coated tool in which a tool base material having a rake face, a flank surface, and a cutting edge forming a boundary between the rake face and the flank surface is coated with diamond. In this diamond-coated tool, the rake face of the tool base material is located at a position separated from the cutting edge by the first rake surface connected (contacting) with the cutting edge and the first rake surface and the first rake when viewed from the inside of the tool base material. A second rake surface located outside the surface and a rake surface side step portion connecting the first rake surface and the second rake surface are provided. The diamond coating layer is formed on the first rake surface and the step portion on the rake surface side, and the rake surface of the diamond coating tool is formed flat.

この態様によると、すくい面側段差部が、剥離抑制構造として機能することで、すくい面側におけるダイヤモンド被覆層の剥離を抑制できるとともに、ダイヤモンドコーティング後のすくい面を平坦に構成することで、切屑をスムーズに流出できる。ダイヤモンド被覆層は、第２すくい面に形成されなくてよい。 According to this aspect, the stepped portion on the rake face side functions as a peeling suppressing structure, so that peeling of the diamond coating layer on the rake face side can be suppressed, and the rake face after the diamond coating is formed flat to form chips. Can be leaked smoothly. The diamond coating layer does not have to be formed on the second rake face.

刃先の角度は９０度以上とし、設定上のすくい角を負の角度にすることで、すくい面側のダイヤモンド被覆層にかかる剪断荷重を低減してよい。 By setting the angle of the cutting edge to 90 degrees or more and setting the rake angle to a negative angle, the shear load applied to the diamond coating layer on the rake face side may be reduced.

１・・・工具母材、２・・・刃先、３・・・ダイヤモンドコーティング工具、１０・・・すくい面、１１・・・第１すくい面、１２・・・すくい面側段差部、１３・・・第２すくい面、２０・・・逃げ面、２１・・・第１逃げ面、２２・・・逃げ面側段差部、２３・・・第２逃げ面、３０・・・ダイヤモンド被覆層、３１・・・切れ刃部。 1 ... tool base material, 2 ... cutting edge, 3 ... diamond coating tool, 10 ... rake surface, 11 ... first rake surface, 12 ... rake surface side stepped portion, 13 ... 2nd rake surface, 20 ... flank surface, 21 ... 1st flank surface, 22 ... flank side stepped portion, 23 ... second flank surface, 30 ... diamond coating layer, 31 ... Cutting edge part.

Claims (5)

すくい面と、逃げ面と、前記すくい面と前記逃げ面の境界をなす刃先とを有する工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具であって、
前記工具母材の前記逃げ面は、前記刃先に連なる第１逃げ面と、前記第１逃げ面よりも前記刃先から離れた位置にあり且つ前記工具母材内部から見て前記第１逃げ面よりも外側に位置する第２逃げ面と、前記第１逃げ面と前記第２逃げ面とを接続する逃げ面側段差部とを備え、
ダイヤモンド被覆層は、前記刃先、前記第１逃げ面および前記逃げ面側段差部に形成される、
ことを特徴とするダイヤモンドコーティング工具。 A diamond-coated tool in which a diamond is coated on a tool base material having a rake face, a flank surface, and a cutting edge forming a boundary between the rake face and the flank surface.
The flank of the tool base material is located at a position away from the first flank surface connected to the cutting edge and the blade edge from the first flank surface, and is from the first flank surface when viewed from the inside of the tool base material. Also provided with a second flank located on the outside and a flank side step portion connecting the first flank and the second flank.
The diamond coating layer is formed on the cutting edge, the first flank surface, and the flank surface side step portion.
A diamond coating tool that features that. 前記工具母材の前記すくい面は、前記刃先に連なる第１すくい面と、前記第１すくい面よりも前記刃先から離れた位置にあり且つ前記工具母材内部から見て前記第１すくい面よりも外側に位置する第２すくい面と、前記第１すくい面と前記第２すくい面とを接続するすくい面側段差部とを備え、
前記ダイヤモンド被覆層は、前記第１すくい面および前記すくい面側段差部に形成される、
ことを特徴とする請求項１に記載のダイヤモンドコーティング工具。 The rake surface of the tool base material is located at a position separated from the cutting edge by the first rake surface connected to the cutting edge and the first rake surface and from the first rake surface when viewed from the inside of the tool base material. Also provided with a second rake face located on the outside and a rake face side step portion connecting the first rake face and the second rake face.
The diamond coating layer is formed on the first rake surface and the step portion on the rake surface side.
The diamond coating tool according to claim 1. すくい面と、逃げ面と、前記すくい面と前記逃げ面の境界をなす刃先とを有する工具母材にダイヤモンドをコーティングしたダイヤモンドコーティング工具であって、
前記工具母材の前記すくい面は、前記刃先に連なる第１すくい面と、前記第１すくい面よりも前記刃先から離れた位置にあり且つ前記工具母材内部から見て前記第１すくい面よりも外側に位置する第２すくい面と、前記第１すくい面と前記第２すくい面とを接続するすくい面側段差部とを備え、
ダイヤモンド被覆層は、前記第１すくい面および前記すくい面側段差部に形成され、前記ダイヤモンドコーティング工具のすくい面は平坦に構成される、
ことを特徴とするダイヤモンドコーティング工具。 A diamond-coated tool in which a diamond is coated on a tool base material having a rake face, a flank surface, and a cutting edge forming a boundary between the rake face and the flank surface.
The rake surface of the tool base material is located at a position separated from the cutting edge by the first rake surface connected to the cutting edge and the first rake surface and from the first rake surface when viewed from the inside of the tool base material. Also provided with a second rake face located on the outside and a rake face side step portion connecting the first rake face and the second rake face.
The diamond coating layer is formed on the first rake surface and the step portion on the rake surface side, and the rake surface of the diamond coating tool is formed flat.
A diamond coating tool that features that. 前記ダイヤモンド被覆層は、前記第２すくい面には形成されない、
ことを特徴とする請求項３に記載のダイヤモンドコーティング工具。 The diamond coating layer is not formed on the second rake surface.
The diamond coating tool according to claim 3. 刃先の角度は９０度以上である、
ことを特徴とする請求項１から４のいずれかに記載のダイヤモンドコーティング工具。 The angle of the cutting edge is 90 degrees or more,
The diamond coating tool according to any one of claims 1 to 4.
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