JP7417707B2

JP7417707B2 - End mill and method for manufacturing cut products

Info

Publication number: JP7417707B2
Application number: JP2022503681A
Authority: JP
Inventors: 雅彦黒田
Original assignee: Kyocera Corp
Current assignee: Kyocera Corp
Priority date: 2020-02-28
Filing date: 2021-02-25
Publication date: 2024-01-18
Anticipated expiration: 2041-02-25
Also published as: WO2021172414A1; CN115135440B; JPWO2021172414A1; CN115135440A

Description

Cross-reference of related applications

本出願は、２０２０年２月２８日に出願された日本国特許出願２０２０－０３３５４３号の優先権を主張するものであり、この先の出願の開示全体を、ここに参照のために取り込む。 This application claims priority to Japanese Patent Application No. 2020-033543 filed on February 28, 2020, and the entire disclosure of this earlier application is hereby incorporated by reference.

本開示は、一般的には、被削材の転削加工に用いられる回転工具に関する。回転工具として、例えば、エンドミルが挙げられる。エンドミルとして、例えば、スクエアエンドミル及びボールエンドミルが挙げられる。 TECHNICAL FIELD The present disclosure generally relates to a rotary tool used for milling a workpiece. Examples of rotary tools include end mills. Examples of the end mill include a square end mill and a ball end mill.

被削材を転削加工する際に用いられる切削工具として、例えば特開２０１０－１０５０９３号公報（特許文献１）に記載のボールエンドミルが挙げられる。特許文献１に記載のボールエンドミルは、エンドミルの一例である。特許文献１に記載のエンドミルは、切刃、第１のギャッシュ部、第２のギャッシュ部及び切屑の排出溝を有する。第１のギャッシュ部及び第２のギャッシュ部は、それぞれＶ字溝の形状である。 As a cutting tool used when machining a workpiece material, for example, a ball end mill described in JP-A No. 2010-105093 (Patent Document 1) can be mentioned. The ball end mill described in Patent Document 1 is an example of an end mill. The end mill described in Patent Document 1 has a cutting blade, a first gash portion, a second gash portion, and a chip discharge groove. The first gash portion and the second gash portion each have a V-shaped groove shape.

特許文献１において、第１のギャッシュ部及び第２のギャッシュ部がＶ字溝の形状である。そのため、切刃から離れた箇所において、切屑が、第１のギャッシュ部を乗り越えられず、第１のギャッシュ部において詰まる恐れがある。 In Patent Document 1, the first gash part and the second gash part have a V-shaped groove shape. Therefore, chips may not be able to get over the first gash portion at a location away from the cutting edge, and may become clogged in the first gash portion.

本開示の限定されない一面のエンドミルは、回転軸に沿って第１端から第２端にかけて延びた本体を有する。前記本体は、前記第１端に位置するチゼル刃と、前記チゼル刃から外周に向かってそれぞれ延びた第１切刃及び第２切刃と、前記回転軸の回転方向の後方において前記第１切刃に接続された第１逃げ面と、前記回転軸の回転方向の後方において前記第２切刃に接続された第２逃げ面と、前記回転方向の前方において前記第１切刃に接続された第１刃溝と、前記第１刃溝よりも前記第２端の近くに位置する排出溝と、を有する。前記第１刃溝は、底部と、前記底部及び前記第１切刃の間に位置し、前記排出溝に接続された第１壁面と、前記底部に対して前記回転方向の前方に位置し、前記排出溝から離れた第２壁面と、を有する。前記第１壁面は、前記第２壁面よりも前記第２端の近くにまで伸びる。 The non-limiting one-sided end mill of the present disclosure has a body extending from a first end to a second end along an axis of rotation. The main body includes a chisel blade located at the first end, a first cutting blade and a second cutting blade each extending from the chisel blade toward the outer periphery, and the first cutting blade at the rear in the rotational direction of the rotating shaft. a first flank connected to the blade; a second flank connected to the second cutting blade at the rear in the rotational direction of the rotating shaft; and a second flank connected to the first cutting blade at the front in the rotational direction. It has a first blade groove and a discharge groove located closer to the second end than the first blade groove. The first cutting groove is located in front of the bottom in the rotational direction with respect to the bottom, a first wall surface that is located between the bottom and the first cutting blade , and connected to the discharge groove , and the bottom . a second wall surface remote from the discharge groove . The first wall surface extends closer to the second end than the second wall surface.

限定されない実施形態のエンドミルを示す斜視図である。1 is a perspective view of a non-limiting embodiment of an end mill; FIG. 図１に示すエンドミルを第１端の側から見た平面図である。FIG. 2 is a plan view of the end mill shown in FIG. 1 when viewed from the first end side. 図２に示すエンドミルをＡ１方向から見た側面図である。FIG. 3 is a side view of the end mill shown in FIG. 2 when viewed from direction A1. 図２に示すエンドミルをＡ２方向から見た側面図である。FIG. 3 is a side view of the end mill shown in FIG. 2 when viewed from direction A2. 図２に示すエンドミルをＡ３方向から見た側面図である。FIG. 3 is a side view of the end mill shown in FIG. 2 when viewed from direction A3. 図２に示すエンドミルをＡ４方向から見た側面図である。FIG. 3 is a side view of the end mill shown in FIG. 2 when viewed from the A4 direction. 図３に示す領域Ｂ１を拡大した拡大図である。4 is an enlarged view of region B1 shown in FIG. 3. FIG. 図７に示す領域と同じ拡大図である。8 is an enlarged view of the same area as shown in FIG. 7; FIG. 図８に示すエンドミルにおけるＩＸ断面の断面図である。9 is a sectional view of the IX section of the end mill shown in FIG. 8. FIG. 図８に示すエンドミルにおけるＸ断面の断面図である。FIG. 9 is a sectional view taken along the X section of the end mill shown in FIG. 8; 図８に示すエンドミルにおけるＸＩ断面の断面図である。FIG. 9 is a sectional view taken along the XI section of the end mill shown in FIG. 8; 図８に示すエンドミルにおけるＸＩＩ断面の断面図である。FIG. 9 is a cross-sectional view taken along section XII in the end mill shown in FIG. 8; 図５に示す領域Ｂ２を拡大した拡大図である。6 is an enlarged view of region B2 shown in FIG. 5. FIG. 限定されない実施形態の切削加工物の製造方法における一工程を示す概略図である。FIG. 2 is a schematic diagram illustrating one step in a method for manufacturing a cut workpiece according to a non-limiting embodiment. 限定されない実施形態の切削加工物の製造方法における一工程を示す概略図である。FIG. 2 is a schematic diagram illustrating one step in a method for manufacturing a cut workpiece according to a non-limiting embodiment. 限定されない実施形態の切削加工物の製造方法における一工程を示す概略図である。FIG. 2 is a schematic diagram illustrating one step in a method for manufacturing a cut workpiece according to a non-limiting embodiment.

限定されない実施形態のエンドミル１について図面を用いて詳細に説明する。なお、限定されない実施形態においては、エンドミルの一例としてボールエンドミルが示され得る。ただし、エンドミルはボールエンドミルに限定されず、例えばスクエアエンドミルなどであってもよい。 An end mill 1 according to a non-limiting embodiment will be described in detail with reference to the drawings. Note that in a non-limiting embodiment, a ball end mill may be shown as an example of the end mill. However, the end mill is not limited to a ball end mill, and may be, for example, a square end mill.

以下で参照する各図では、説明の便宜上、限定されない実施形態を構成する部材における主要な部材のみが簡略化して示される。したがって、エンドミル１は、本明細書が参照する各図に示されていない任意の構成部材を備え得る。また、各図中の部材の寸法は、実際の構成部材の寸法及び各部材の寸法比率を忠実に表したものではない。これらの点は、後述する切削加工物の製造方法においても同様である。 In each of the figures referred to below, for convenience of explanation, only the main members constituting the non-limiting embodiment are shown in a simplified manner. Therefore, the end mill 1 may include any constituent members not shown in the figures referred to in this specification. Furthermore, the dimensions of the members in each figure do not faithfully represent the dimensions of the actual constituent members and the dimensional ratios of each member. These points also apply to the method for manufacturing a cut workpiece, which will be described later.

エンドミル１は、図１などに示すように、回転軸Ｒ１を有するとともに第１端３ａから第２端３ｂにかけて延びた円柱形状の本体３を有してもよい。一般的には、第１端３ａが「先端」と呼ばれ、第２端３ｂが「後端」と呼ばれる。 As shown in FIG. 1, the end mill 1 may have a cylindrical main body 3 having a rotation axis R1 and extending from a first end 3a to a second end 3b. Generally, the first end 3a is called the "tip" and the second end 3b is called the "rear end."

図１に示す限定されない一例におけるエンドミル１は、第１端３ａから第２端３ｂにかけて回転軸Ｒ１に沿って延びた棒形状の本体３を有してもよい。本体３は、切削加工物を製造するための被削材の切削加工時において、図１に示す限定されない一例のように回転軸Ｒ１を中心に矢印Ｒ２の方向に回転可能である。 The end mill 1 in the non-limiting example shown in FIG. 1 may have a rod-shaped main body 3 extending from the first end 3a to the second end 3b along the rotation axis R1. The main body 3 is rotatable in the direction of an arrow R2 around a rotation axis R1, as shown in a non-limiting example shown in FIG. 1, during cutting of a workpiece for producing a cut workpiece.

図１に示す限定されない一例においては、本体３の左下側の端部が第１端３ａ、右上側の端部が第２端３ｂであってもよい。また、図３～図６に示す限定されない一例においては、本体３の左側の端部が第１端３ａ、右側の端部が第２端３ｂであってもよい。 In a non-limiting example shown in FIG. 1, the lower left end of the main body 3 may be the first end 3a, and the upper right end may be the second end 3b. Furthermore, in a non-limiting example shown in FIGS. 3 to 6, the left end of the main body 3 may be the first end 3a, and the right end may be the second end 3b.

なお、図３～図６は、図２に示すエンドミル１を回転方向Ｒ２に所定の角度で回転させた状態を示す図である。図３は、図２に示すエンドミル１をＡ１方向から見た図である。図４は、図２に示すエンドミル１をＡ２方向から見た図である。図４は、図３に対して９０°ずらした方向から見た図である。図５は、図２に示すエンドミル１をＡ３方向から見た図である。図５は、図４に対して９０°ずらした方向から見た図である。図６は、図２に示すエンドミル１をＡ４方向から見た図である。図６は、図５に対して９０°ずらした方向から見た図である。 Note that FIGS. 3 to 6 are diagrams showing a state in which the end mill 1 shown in FIG. 2 is rotated at a predetermined angle in the rotation direction R2. FIG. 3 is a diagram of the end mill 1 shown in FIG. 2 viewed from the A1 direction. FIG. 4 is a diagram of the end mill 1 shown in FIG. 2 viewed from the A2 direction. FIG. 4 is a view seen from a direction shifted by 90 degrees with respect to FIG. FIG. 5 is a diagram of the end mill 1 shown in FIG. 2 viewed from the A3 direction. FIG. 5 is a view seen from a direction shifted by 90 degrees with respect to FIG. FIG. 6 is a diagram of the end mill 1 shown in FIG. 2 viewed from the A4 direction. FIG. 6 is a view seen from a direction shifted by 90 degrees with respect to FIG.

図１に示す限定されない一例における本体３は、円柱状であってもよい。円柱状とは、厳密な意味での円柱のみならず、若干の凹凸又は湾曲などをも含む趣旨である。なお、本体３の形状は、円柱状に限定されない。 The main body 3 in the non-limiting example shown in FIG. 1 may be cylindrical. The cylindrical shape includes not only a cylinder in the strict sense but also some irregularities or curves. Note that the shape of the main body 3 is not limited to a cylindrical shape.

本体３における外径Ｄは、例えば、４ｍｍ～２５ｍｍに設定され得る。また、回転軸Ｒ１に沿った方向における本体３の長さをＬとするとき、Ｌ及びＤの関係は、例えば、Ｌ＝４Ｄ～１５Ｄに設定され得る。このとき、本体３の外径は、第１端３ａの側から第２端３ｂの側にかけて一定であってもよく、変化してもよい。例えば、本体３の外径が、第１端３ａの側から第２端３ｂの側にかけて小さくなってもよい。 The outer diameter D of the main body 3 can be set to, for example, 4 mm to 25 mm. Furthermore, when the length of the main body 3 in the direction along the rotation axis R1 is L, the relationship between L and D may be set to, for example, L=4D to 15D. At this time, the outer diameter of the main body 3 may be constant or may vary from the first end 3a side to the second end 3b side. For example, the outer diameter of the main body 3 may become smaller from the first end 3a side to the second end 3b side.

本体３は、チゼル刃５、第１切刃７、第２切刃９、第１逃げ面１１、第２逃げ面１３、第１刃溝１５及び第１排出溝１７を有してもよい。 The main body 3 may have a chisel blade 5 , a first cutting edge 7 , a second cutting edge 9 , a first flank 11 , a second flank 13 , a first cutting groove 15 , and a first discharge groove 17 .

チゼル刃５は、本体３の第１端３ａに位置してもよい。チゼル刃５は、回転軸Ｒ１と交差してもよい。言い換えれば、回転軸Ｒ１に沿った方向からの第１端３ａの正面視において、チゼル刃５は、回転軸Ｒ１を含んでもよい。なお、回転軸Ｒ１に沿った方向からの第１端３ａの正面視は、一般的には先端視とも呼ばれる。 The chisel blade 5 may be located at the first end 3a of the body 3. The chisel blade 5 may intersect the rotation axis R1. In other words, the chisel blade 5 may include the rotation axis R1 when viewed from the front of the first end 3a from the direction along the rotation axis R1. Note that the front view of the first end 3a from the direction along the rotation axis R1 is also generally referred to as a tip view.

第１切刃７及び第２切刃９は、第１端３ａの近傍にそれぞれ位置してもよく、且つ、チゼル刃５から外周に向かってそれぞれ延びてもよい。第１切刃７は、チゼル刃５における一方の端部に接続されてもよく、且つ、第２切刃９は、チゼル刃５におけるもう一方の端部に接続されてもよい。チゼル刃５、第１切刃７及び第２切刃９によって被削材の切削加工を行うことができる。 The first cutting edge 7 and the second cutting edge 9 may each be located near the first end 3a, and may each extend from the chisel blade 5 toward the outer periphery. The first cutting edge 7 may be connected to one end of the chisel blade 5, and the second cutting edge 9 may be connected to the other end of the chisel blade 5. The chisel blade 5, the first cutting blade 7, and the second cutting blade 9 can cut the workpiece.

第１切刃７及び第２切刃９は、すくい面及び逃げ面（第１逃げ面１１及び第２逃げ面１３）の交わりに位置してもよい。一方、チゼル刃５は、これらの逃げ面１１、１３の交わりに位置してもよい。チゼル刃５、第１切刃７及び第２切刃９によって構成される切刃は、先端視において、回転軸Ｒ１を中心に１８０°回転対称の形状であってもよい。 The first cutting edge 7 and the second cutting edge 9 may be located at the intersection of the rake face and the flank face (the first flank face 11 and the second flank face 13). On the other hand, the chisel blade 5 may be located at the intersection of these flank surfaces 11 and 13. The cutting blade constituted by the chisel blade 5, the first cutting blade 7, and the second cutting blade 9 may have a shape that is 180° rotationally symmetrical about the rotation axis R1 when viewed from the tip.

図１に示す限定されない一例のようにエンドミル１がボールエンドミルである場合には、図３などに示すように側面視した際に、第１切刃７及び第２切刃９が凸曲線形状であってもよい。なお、上述したようにエンドミル１がスクエアエンドミルである場合には、第１切刃７及び第２切刃９が回転軸Ｒ１に直交する方向に延びた直線形状であってもよい。 When the end mill 1 is a ball end mill as in the non-limiting example shown in FIG. 1, the first cutting edge 7 and the second cutting edge 9 have a convex curved shape when viewed from the side as shown in FIG. There may be. Note that when the end mill 1 is a square end mill as described above, the first cutting blade 7 and the second cutting blade 9 may have a linear shape extending in a direction perpendicular to the rotation axis R1.

第１逃げ面１１は、回転軸Ｒ１の回転方向Ｒ２の後方において第１切刃７に接続されてもよい。第１逃げ面１１は平面であってもよく、また、曲面であってもよい。第１逃げ面１１が平面である場合に、第１逃げ面１１は１つの平面によって構成されてもよく、また、複数の平面によって構成されてもよい。 The first flank 11 may be connected to the first cutting edge 7 at the rear in the rotation direction R2 of the rotation axis R1. The first flank surface 11 may be a flat surface or a curved surface. When the first flank surface 11 is a plane, the first flank surface 11 may be composed of one plane, or may be composed of a plurality of planes.

第２逃げ面１３は、回転軸Ｒ１の回転方向Ｒ２の後方において第２切刃９に接続されてもよい。第１逃げ面１１と同様に、第２逃げ面１３もまた、平面であってもよく、また、曲面であってもよい。第２逃げ面１３が平面である場合に、第２逃げ面１３は１つの平面によって構成されてもよく、また、複数の平面によって構成されてもよい。 The second flank surface 13 may be connected to the second cutting edge 9 at the rear of the rotation direction R2 of the rotation axis R1. Like the first flank surface 11, the second flank surface 13 may also be a flat surface or a curved surface. When the second flank surface 13 is a plane, the second flank surface 13 may be composed of one plane, or may be composed of a plurality of planes.

第１刃溝１５は、回転方向Ｒ２の前方において第１切刃７に接続されてもよい。すなわち、第１切刃７は、第１逃げ面１１及び第１刃溝１５の交わりに位置してもよい。第１刃溝１５は、第１切刃７の強度を向上させる機能を有してもよい。 The first blade groove 15 may be connected to the first cutting blade 7 at the front in the rotation direction R2. That is, the first cutting edge 7 may be located at the intersection of the first flank 11 and the first cutting groove 15. The first cutting groove 15 may have a function of improving the strength of the first cutting edge 7.

第１刃溝１５は、本体３の外周面から概ね回転軸Ｒ１に向かって延びてもよい。このとき、第１刃溝１５は、回転軸Ｒ１に向かうにしたがって第１端３ａに近づいてもよい。図に示す限定されない一例のように、第１刃溝１５は、Ｖ溝形状であってもよく、且つ、第１底部１９、第１壁面２１及び第２壁面２３を有してもよい。 The first blade groove 15 may extend from the outer circumferential surface of the main body 3 approximately toward the rotation axis R1. At this time, the first blade groove 15 may approach the first end 3a as it goes toward the rotation axis R1. As in a non-limiting example shown in the figure, the first blade groove 15 may have a V-groove shape, and may have a first bottom portion 19, a first wall surface 21, and a second wall surface 23.

第１壁面２１は、第１底部１９及び第１切刃７の間に位置してもよい。ここで、第１壁面２１は、回転方向Ｒ２の前方において第１切刃７に接続されてもよい。このとき、第１壁面２１は、上述したすくい面として機能してもよい。第２壁面２３は、第１底部１９に対して回転方向Ｒ２の前方に位置してもよい。このとき、第２壁面２３は、切屑を湾曲させるブレーカ壁として機能してもよい。なお、第１底部１９が第１壁面２１及び第２壁面２３の間に位置する、と言い換えてもよい。 The first wall surface 21 may be located between the first bottom portion 19 and the first cutting edge 7 . Here, the first wall surface 21 may be connected to the first cutting blade 7 at the front in the rotation direction R2. At this time, the first wall surface 21 may function as the above-mentioned rake surface. The second wall surface 23 may be located in front of the first bottom portion 19 in the rotation direction R2. At this time, the second wall surface 23 may function as a breaker wall that curves the chips. In addition, it may be said in other words that the first bottom portion 19 is located between the first wall surface 21 and the second wall surface 23.

Ｖ溝形状である第１刃溝１５を、この第１刃溝１５の延びる方向に対して直交する断面で見た場合に、第１壁面２１は、直線であってもよく、また、曲線であってもよい。同じ断面において、第２壁面２３は、直線であってもよく、また、曲線であってもよい。さらに同じ断面において、第１底部１９は、凹曲線であってもよい。この場合には、切削負荷に起因する亀裂が第１底部１９に生じにくいため、エンドミル１の耐久性が向上し得る。 When the first blade groove 15 having a V-groove shape is viewed in a cross section perpendicular to the direction in which the first blade groove 15 extends, the first wall surface 21 may be a straight line or may be a curved line. There may be. In the same cross section, the second wall surface 23 may be a straight line or a curved line. Further, in the same cross section, the first bottom portion 19 may have a concave curve. In this case, cracks due to cutting loads are less likely to occur in the first bottom portion 19, so the durability of the end mill 1 can be improved.

Ｖ溝形状である第１刃溝１５は、真っ直ぐに延びてもよく、また、図１に示す限定されない一例のように、回転軸Ｒ１を中心に螺旋状に延びてもよい。第１刃溝１５が螺旋状に延びる場合における第１刃溝１５のねじれ角は、特定の値には限定されず、例えば、５°～６０°に設定され得る。第１刃溝１５が螺旋状に延びる場合に、第１壁面２１及び第２壁面２３は、それぞれ曲面でありつつ、上記の断面においてそれぞれ直線で示されてもよい。 The first blade groove 15 having a V-groove shape may extend straight, or may extend spirally about the rotation axis R1, as in a non-limiting example shown in FIG. The helix angle of the first blade groove 15 when the first blade groove 15 extends spirally is not limited to a specific value, and may be set to, for example, 5° to 60°. When the first blade groove 15 extends spirally, the first wall surface 21 and the second wall surface 23 may each be shown as a straight line in the above-mentioned cross section, while each being a curved surface.

第１排出溝１７は、第１刃溝１５よりも第２端３ｂの近くに位置してもよい。第１排出溝１７は、第１切刃７で生じた切屑を第２端３ｂに向かって送り出し、切屑を外部に排出する機能を有してもよい。第１排出溝１７は、第２端３ｂに向かって延びるが、第２端３ｂにまで伸びる必要はなく、第２端３ｂから離れて位置してもよい。 The first discharge groove 17 may be located closer to the second end 3b than the first blade groove 15. The first discharge groove 17 may have a function of sending out chips generated by the first cutting edge 7 toward the second end 3b and discharging the chips to the outside. The first discharge groove 17 extends toward the second end 3b, but does not need to extend to the second end 3b and may be located away from the second end 3b.

第１排出溝１７は、第２端３ｂに向かって真っ直ぐに延びてもよく、また、図１に示す限定されない一例のように、回転軸Ｒ１を中心に螺旋状に延びてもよい。第１排出溝１７が螺旋状に延びる場合における第１排出溝１７のねじれ角は、特定の値には限定されず、例えば、５°～６０°に設定され得る。 The first discharge groove 17 may extend straight toward the second end 3b, or may extend spirally about the rotation axis R1, as in a non-limiting example shown in FIG. The twist angle of the first exhaust groove 17 when the first exhaust groove 17 extends spirally is not limited to a specific value, and may be set to, for example, 5° to 60°.

図１に示す限定されない一例のエンドミル１は、右回転で使用される工具であるため、第１刃溝１５及び第１排出溝１７が右ねじれであるが、エンドミル１はこれに限定されない。例えば、左回転で使用される工具であって、第１刃溝１５及び第１排出溝１７が左ねじれであっても、何ら問題無い。 The end mill 1 shown in FIG. 1 as a non-limiting example is a tool that is used in clockwise rotation, so the first blade groove 15 and the first discharge groove 17 are twisted to the right, but the end mill 1 is not limited to this. For example, even if the tool is used in left-handed rotation, and the first blade groove 15 and first discharge groove 17 are left-handed, there is no problem.

図７に示す限定されない一例のように、第１壁面２１は、第２壁面２３よりも第２端３ｂの近くにまで伸びてもよい。この場合には、第１壁面２１の上を流れる切屑が、第１壁面２１における第２壁面２３よりも第２端３ｂの近くに位置する領域において、第１刃溝１５に対して回転方向Ｒ２の前方に位置する部分へと進み易い。そのため、第１刃溝１５において切屑が詰まりにくく、切屑の排出性が高い。第１刃溝１５に対して回転方向Ｒ２の前方に位置する部分としては、例えば、第１排出溝１７、及び、図７に示す限定されない一例のように後述する第２刃溝２５が挙げられ得る。 As in a non-limiting example shown in FIG. 7, the first wall surface 21 may extend closer to the second end 3b than the second wall surface 23. In this case, the chips flowing on the first wall surface 21 are located in the rotation direction R2 with respect to the first blade groove 15 in a region of the first wall surface 21 located closer to the second end 3b than the second wall surface 23. It is easy to proceed to the part located in front of the Therefore, the first blade groove 15 is less likely to be clogged with chips, and the chip discharge performance is high. Examples of the portion located in front of the first blade groove 15 in the rotational direction R2 include the first discharge groove 17 and a second blade groove 25, which will be described later, as in a non-limiting example shown in FIG. obtain.

第１壁面２１が第１排出溝１７に接続され、且つ、第２壁面２３が第１排出溝１７から離れてもよい。この場合には、第１刃溝１５の上を流れる切屑が、第１排出溝１７へと進み易い。また、後述するように本体３が第２刃溝２５を有する場合には、第１刃溝１５の上を流れる切屑が、第１排出溝１７に加えて第２刃溝２５へも進み易い。 The first wall surface 21 may be connected to the first discharge groove 17 and the second wall surface 23 may be separated from the first discharge groove 17 . In this case, chips flowing above the first blade groove 15 tend to advance to the first discharge groove 17. Further, as will be described later, when the main body 3 has the second blade groove 25, chips flowing on the first blade groove 15 tend to advance not only to the first discharge groove 17 but also to the second blade groove 25.

第２壁面２３は、第２端３ｂに近づくにしたがって幅Ｗが小さくなる部分を有してもよい。第２壁面２３の全体が、第２端３ｂに近づくにしたがって幅Ｗが小さくなる構成であってもよい。第２壁面２３における第１端３ａの近くに位置する、言い換えれば、切刃の近くに位置する部分での幅Ｗが相対的に大きい場合には、第２壁面２３において切屑を安定して湾曲させることができる。 The second wall surface 23 may have a portion where the width W decreases as it approaches the second end 3b. The entire second wall surface 23 may have a configuration in which the width W decreases as it approaches the second end 3b. When the width W at the portion of the second wall surface 23 located near the first end 3a, in other words, located near the cutting edge, is relatively large, the chips are stably curved at the second wall surface 23. can be done.

さらに、第２壁面２３が、第２端３ｂに近づくにしたがって幅Ｗが小さくなる部分を有する場合には、第２壁面２３における第２端３ｂの近くに位置する部分での幅Ｗが小さくなる。そのため、切屑を安定して湾曲させつつ切屑が第２壁面２３を乗り越えることを容易にできる。なお、上記の幅Ｗとは、棒形状である本体３の径方向における幅を意味してもよい。また、幅Ｗは、例えば図９に示すように、回転軸Ｒ１に直交する断面において評価してもよい。 Furthermore, when the second wall surface 23 has a portion where the width W becomes smaller as it approaches the second end 3b, the width W becomes smaller at the portion of the second wall surface 23 located near the second end 3b. . Therefore, the chips can easily get over the second wall surface 23 while stably curving the chips. Note that the above-mentioned width W may mean the width in the radial direction of the rod-shaped main body 3. Further, the width W may be evaluated in a cross section perpendicular to the rotation axis R1, as shown in FIG. 9, for example.

第２壁面２３における第２端３ｂに近づくにしたがって幅Ｗが小さくなる部分では、幅Ｗが連続的に小さくなってもよい。幅Ｗが連続的に小さくなっており第２壁面２３の上端にエッジが存在しない場合には、第２壁面２３の磨耗が進行しにくく、また、第２壁面２３に欠けが生じにくい。そのため、長期に亘り安定してエンドミル１を使用できる。 In a portion of the second wall surface 23 where the width W decreases as it approaches the second end 3b, the width W may decrease continuously. When the width W decreases continuously and there is no edge at the upper end of the second wall surface 23, the second wall surface 23 is less prone to wear and chipping is less likely to occur on the second wall surface 23. Therefore, the end mill 1 can be used stably for a long period of time.

第１刃溝１５は、第２逃げ面１３に接続されてもよい。この場合には、チゼル刃５及び第１切刃７で生じた切屑が安定して第１刃溝１５に流れ得る。そのため、チゼル刃５及び第１切刃７の付近において切屑が詰まりにくい。 The first blade groove 15 may be connected to the second flank surface 13. In this case, chips generated by the chisel blade 5 and the first cutting blade 7 can stably flow into the first blade groove 15. Therefore, the vicinity of the chisel blade 5 and the first cutting edge 7 is less likely to be clogged with chips.

このとき、第１端３ａの正面視、すなわち先端視において、第２逃げ面１３及び第２壁面２３が交わる稜線Ｌ１は、回転軸Ｒ１から離れるにしたがって回転方向Ｒ２の後方に向かって傾斜する部分を有してもよい。この場合には、第２切刃９に対して切削負荷が加わる方向の先に位置する第１刃溝１５の量を減らし、本体３における第２切刃９に対して切削負荷が加わる方向の先に位置する部分の肉厚が厚く確保され得る。そのため、第２切刃９に加わる切削負荷に対する耐久性が高い。 At this time, in a front view of the first end 3a, that is, in a tip view, the ridge line L1 where the second flank surface 13 and the second wall surface 23 intersect is a portion that slopes toward the rear in the rotation direction R2 as it moves away from the rotation axis R1. It may have. In this case, the amount of the first blade groove 15 located in the direction in which the cutting load is applied to the second cutting edge 9 is reduced, and The thickness of the portion located first can be ensured to be thick. Therefore, the durability against the cutting load applied to the second cutting edge 9 is high.

本体３は、第１刃溝１５に加えて第２刃溝２５をさらに有してもよい。第２刃溝２５は、図７に示す限定されない一例のように、回転方向Ｒ２の前方において第１刃溝１５に接続されてもよい。ここで、第２壁面２３における第２端３ｂの側の端部よりも第２端３ｂの近くにおいて、第１壁面２１が第２刃溝２５に接続されてもよい。 The main body 3 may further include a second blade groove 25 in addition to the first blade groove 15. The second blade groove 25 may be connected to the first blade groove 15 at the front in the rotation direction R2, as in a non-limiting example shown in FIG. Here, the first wall surface 21 may be connected to the second blade groove 25 closer to the second end 3b than the end of the second wall surface 23 on the second end 3b side.

この場合には、第１壁面２１の上を流れる切屑が、第１壁面２１における第２壁面２３よりも第２端３ｂの近くに位置する領域において、第１刃溝１５に対して回転方向Ｒ２の前方に位置する第２刃溝２５へと進み易い。 In this case, the chips flowing on the first wall surface 21 are located in the rotation direction R2 with respect to the first blade groove 15 in a region of the first wall surface 21 located closer to the second end 3b than the second wall surface 23. The blade easily advances to the second blade groove 25 located in front of the blade.

第１刃溝１５及び第２刃溝２５は、それぞれギャッシュと呼ばれる部位であってもよい。例えば、第１刃溝１５が第１ギャッシュ、第２刃溝２５が第２ギャッシュと位置付けられてもよい。 The first blade groove 15 and the second blade groove 25 may each be a portion called a gash. For example, the first blade groove 15 may be positioned as the first gash, and the second blade groove 25 may be positioned as the second gash.

第２刃溝２５は、Ｖ溝形状であってもよく、且つ、第２底部２７、第３壁面２９及び第４壁面３１を有してもよい。図７に示す限定されない一例のように、第３壁面２９が相対的に回転方向Ｒ２の後方に位置し、第４壁面３１が相対的に回転方向Ｒ２の前方に位置し、第２底部２７が、第３壁面２９及び第４壁面３１の間に位置してもよい。 The second blade groove 25 may have a V-groove shape, and may include a second bottom portion 27, a third wall surface 29, and a fourth wall surface 31. As in a non-limiting example shown in FIG. 7, the third wall surface 29 is relatively located at the rear in the rotation direction R2, the fourth wall surface 31 is located relatively at the front in the rotation direction R2, and the second bottom portion 27 is located at the rear in the rotation direction R2. , may be located between the third wall surface 29 and the fourth wall surface 31.

ここで、第１刃溝１５における第１壁面２１が第２壁面２３よりも第２端３ｂの近くにまで伸びる一方で、第２刃溝２５における第３壁面２９及び第４壁面３１は、第２端３ｂからの距離が同程度の位置まで延びてもよい。第２刃溝２５が第１刃溝１５に対して回転方向Ｒ２の前方に位置することから、切屑の流れるスペースが広く、第１刃溝１５と比較して第２刃溝２５においては切屑が詰まりにくい。そのため、第４壁面３１が、第２端３ｂに向かって第３壁面２９と同程度に延びても切屑が詰まる恐れが小さく、且つ、第４壁面３１によって安定して切屑を湾曲させることができる。 Here, while the first wall surface 21 in the first blade groove 15 extends closer to the second end 3b than the second wall surface 23, the third wall surface 29 and the fourth wall surface 31 in the second blade groove 25 extend closer to the second end 3b than the second wall surface 23. The distance from the two ends 3b may be approximately the same. Since the second blade groove 25 is located in front of the first blade groove 15 in the rotation direction R2, there is a wider space for chips to flow, and compared to the first blade groove 15, the second blade groove 25 has a larger space for chips to flow. Not easy to get clogged. Therefore, even if the fourth wall surface 31 extends toward the second end 3b to the same extent as the third wall surface 29, there is little risk of chips clogging, and the fourth wall surface 31 can stably curve the chips. .

なお、同程度とは、第２端３ｂから第３壁面２９までの距離が、第２端３ｂから第４壁面３１までの距離に対して９５～１０５％程度であることを意味する。 It should be noted that the same level means that the distance from the second end 3b to the third wall surface 29 is approximately 95 to 105% of the distance from the second end 3b to the fourth wall surface 31.

第２切刃９は、チゼル刃５に接続された内端部９ａを有する。先端視において、内端部９ａにおける第２切刃９の接線に直交し、且つ、内端部９ａを通る仮想直線を基準線Ｌ３とする。このとき、第１刃溝１５が基準線Ｌ３よりも回転方向Ｒ２の後方に位置し、且つ、第２刃溝２５が基準線Ｌ３と交差してもよい。 The second cutting edge 9 has an inner end 9a connected to the chisel blade 5. When viewed from the tip, a virtual straight line that is perpendicular to the tangent of the second cutting edge 9 at the inner end 9a and passes through the inner end 9a is defined as a reference line L3. At this time, the first blade groove 15 may be located behind the reference line L3 in the rotation direction R2, and the second blade groove 25 may intersect with the reference line L3.

第１刃溝１５が基準線Ｌ３よりも回転方向Ｒ２の後方に位置する場合には、第２切刃９に対して切削負荷が加わる方向の先に位置する部分であって、第２切刃９の近くに位置する部分での本体３の肉厚が厚く確保され得る。そのため、第２切刃９に加わる切削負荷に対する耐久性が高い。 When the first blade groove 15 is located behind the reference line L3 in the rotation direction R2, the first blade groove 15 is located at the end of the direction in which the cutting load is applied to the second cutting blade 9, and the second cutting blade The thickness of the main body 3 at the portion located near the main body 3 can be ensured to be thick. Therefore, the durability against the cutting load applied to the second cutting edge 9 is high.

仮に、第２刃溝２５が基準線Ｌ３と交差する、すなわち、第２切刃９に対して切削負荷が加わる方向の先に第２刃溝２５が部分的に位置する場合であっても、第２切刃９に耐久性への影響は小さい。これは、第２刃溝２５が第１刃溝１５に対して回転方向Ｒ２の前方に位置するからである。他方、第２切刃９に対して切削負荷が加わる方向の先に第２刃溝２５が部分的に位置する場合には、第１切刃７で生じた切屑が流れるスペースが広く確保される。そのため、切屑の排出性がさらに高い。 Even if the second blade groove 25 intersects with the reference line L3, that is, even if the second blade groove 25 is partially located beyond the direction in which the cutting load is applied to the second cutting blade 9, The influence on the durability of the second cutting edge 9 is small. This is because the second blade groove 25 is located in front of the first blade groove 15 in the rotation direction R2. On the other hand, when the second cutting groove 25 is partially located at the end of the direction in which the cutting load is applied to the second cutting edge 9, a large space is secured for the chips generated by the first cutting edge 7 to flow. . Therefore, the chip evacuation performance is even higher.

第１刃溝１５及び第２刃溝２５の交わる角度は、第２端３ｂに近づくにしたがって小さくなってもよい。具体的には、回転軸Ｘ１に直交する断面において、第１刃溝１５及び第２刃溝２５の交わる角度を角度θとする。この角度θは、第２端３ｂに近づくにしたがって大きくなってもよい。 The angle at which the first blade groove 15 and the second blade groove 25 intersect may become smaller as it approaches the second end 3b. Specifically, in a cross section perpendicular to the rotation axis X1, the angle at which the first blade groove 15 and the second blade groove 25 intersect is defined as the angle θ. This angle θ may increase as it approaches the second end 3b.

第１刃溝１５及び第２刃溝２５の交わる稜線Ｌ２のうち、第１端３ａの近くに位置する部分での第１刃溝１５及び第２刃溝２５の交わる角度θが相対的に小さい場合には、第１刃溝１５において切屑を安定して湾曲させることができる。第１刃溝１５及び第２刃溝２５の交わる稜線Ｌ２のうち、第２端３ｂの近くに位置する部分での第１刃溝１５及び第２刃溝２５の交わる角度θが相対的に大きい場合には、切屑が第２壁面２３を乗り越えることを容易にできる。 Among the ridge lines L2 where the first blade grooves 15 and the second blade grooves 25 intersect, the angle θ at which the first blade grooves 15 and the second blade grooves 25 intersect is relatively small at a portion located near the first end 3a. In this case, the chips can be stably curved in the first blade groove 15. Among the ridge lines L2 where the first blade grooves 15 and the second blade grooves 25 intersect, the angle θ at which the first blade grooves 15 and the second blade grooves 25 intersect is relatively large at a portion located near the second end 3b. In some cases, the chips can easily get over the second wall surface 23.

従って、第１刃溝１５及び第２刃溝２５の交わる角度θが第２端３ｂに近づくにしたがって小さくなる場合には、切屑を安定して湾曲させつつ切屑が第２刃溝２５へと流れることを容易にできる。 Therefore, when the angle θ at which the first blade groove 15 and the second blade groove 25 intersect becomes smaller as it approaches the second end 3b, the chips flow into the second blade groove 25 while stably curving the chips. can be done easily.

第１刃溝１５は、第２端３ｂの側に第２刃溝２５に滑らかに接続される部分を有してもよい。図１１及び図１２に示す限定されない一例のように、第１刃溝１５及び第２刃溝２５の交わる稜線Ｌ２のうち、第２端３ｂの近くに位置する部分における角度θが１８０°である、すなわち、第１刃溝１５が、第２刃溝２５に滑らかに接続される部分を有してもよい。この場合には、切屑が第２刃溝２５へと流れることをさらに容易にできる。 The first blade groove 15 may have a portion smoothly connected to the second blade groove 25 on the second end 3b side. As in a non-limiting example shown in FIGS. 11 and 12, the angle θ at the portion located near the second end 3b of the ridge line L2 where the first blade groove 15 and the second blade groove 25 intersect is 180°. That is, the first blade groove 15 may have a portion that is smoothly connected to the second blade groove 25. In this case, the chips can more easily flow into the second blade groove 25.

本体３は、第３刃溝３３、第４刃溝３５及び第２排出溝３７を有してもよい。 The main body 3 may have a third blade groove 33, a fourth blade groove 35, and a second discharge groove 37.

第３刃溝３３は、回転方向Ｒ２の前方において第２切刃９に接続されてもよい。すなわち、第２切刃９は、第２逃げ面１３及び第３刃溝３３の交わりに位置してもよい。第３刃溝３３は、第２切刃９の強度を向上させる機能を有してもよい。 The third blade groove 33 may be connected to the second cutting blade 9 at the front in the rotation direction R2. That is, the second cutting edge 9 may be located at the intersection of the second flank surface 13 and the third cutting groove 33. The third blade groove 33 may have a function of improving the strength of the second cutting blade 9.

第２切刃９に対する第３刃溝３３の関係性は、第１切刃７に対する第１刃溝１５の関係性と同じであってもよい。すなわち、第３刃溝３３は、第１刃溝１５における第１底部１９に相当する面として第３底部３９を、第１刃溝１５における第１壁面２１に相当する面として第５壁面４１を、第１刃溝１５における第２壁面２３に相当する面として第６壁面４３を、有してもよい。 The relationship of the third blade groove 33 to the second cutting edge 9 may be the same as the relationship of the first blade groove 15 to the first cutting blade 7. That is, the third blade groove 33 has the third bottom portion 39 as a surface corresponding to the first bottom portion 19 in the first blade groove 15 and the fifth wall surface 41 as a surface corresponding to the first wall surface 21 in the first blade groove 15. , you may have the 6th wall surface 43 as a surface corresponded to the 2nd wall surface 23 in the 1st blade groove 15.

第４刃溝３５は、図１３に示す限定されない一例のように、回転方向Ｒ２の前方において第３刃溝３３に接続されてもよい。第２切刃９に対する第４刃溝３５の関係性は、第１切刃７に対する第２刃溝２５の関係性と同じであってもよい。すなわち、第４刃溝３５は、第２刃溝２５における第２底部２７に相当する面として第４底部４５を、第２刃溝２５における第３壁面２９に相当する面として第７壁面４７を、第２刃溝２５における第４壁面３１に相当する面として第８壁面４９を、有してもよい。ここで、第６壁面４３における第２端３ｂの側の端部よりも第２端３ｂの近くにおいて、第６壁面４３が第４刃溝３５に接続されてもよい。 The fourth blade groove 35 may be connected to the third blade groove 33 at the front in the rotation direction R2, as in a non-limiting example shown in FIG. The relationship of the fourth blade groove 35 to the second cutting edge 9 may be the same as the relationship of the second blade groove 25 to the first cutting blade 7. That is, the fourth blade groove 35 has the fourth bottom portion 45 as a surface corresponding to the second bottom portion 27 in the second blade groove 25, and the seventh wall surface 47 as a surface corresponding to the third wall surface 29 in the second blade groove 25. , the second blade groove 25 may have an eighth wall surface 49 as a surface corresponding to the fourth wall surface 31. Here, the sixth wall surface 43 may be connected to the fourth blade groove 35 closer to the second end 3b than the end of the sixth wall surface 43 on the second end 3b side.

本体３の材質としては、例えば、超硬合金及びサーメットなどが挙げられ得る。超硬合金の組成としては、例えば、ＷＣ－Ｃｏ、ＷＣ－ＴｉＣ－Ｃｏ及びＷＣ－ＴｉＣ－ＴａＣ－Ｃｏが挙げられ得る。ここで、ＷＣ、ＴｉＣ、ＴａＣは硬質粒子であり、Ｃｏは結合相である。また、サーメットは、セラミック成分に金属を複合させた焼結複合材料であってもよい。具体的には、サーメットとして、炭化チタン（ＴｉＣ）又は窒化チタン（ＴｉＮ）を主成分としたチタン化合物が挙げられ得る。 Examples of the material of the main body 3 include cemented carbide and cermet. Compositions of the cemented carbide may include, for example, WC-Co, WC-TiC-Co and WC-TiC-TaC-Co. Here, WC, TiC, and TaC are hard particles, and Co is a binder phase. Further, the cermet may be a sintered composite material in which a metal is combined with a ceramic component. Specifically, the cermet may include a titanium compound containing titanium carbide (TiC) or titanium nitride (TiN) as a main component.

本体３の表面は、化学蒸着（ＣＶＤ）法、又は物理蒸着（ＰＶＤ）法を用いて被膜でコーティングされていてもよい。被膜の組成としては、炭化チタン（ＴｉＣ）、窒化チタン（ＴｉＮ）、炭窒化チタン（ＴｉＣＮ）又はアルミナ（Ａｌ_２Ｏ_３）などが挙げられ得る。被膜の厚みは、例えば、０．３μｍ～２０μｍに設定されてもよい。なお、被膜の組成によって好適な範囲は異なる。The surface of the body 3 may be coated with a film using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method. The composition of the film may include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), or alumina (Al ₂ O ₃ ). The thickness of the coating may be set to, for example, 0.3 μm to 20 μm. Note that the suitable range varies depending on the composition of the film.

以上、複数の実施形態のエンドミル１について例示したが、本発明はこれらに限定されず、本発明の要旨を逸脱しない限り任意のものとすることができることは言うまでもない。 Although the end mill 1 of a plurality of embodiments has been illustrated above, it goes without saying that the present invention is not limited to these and can be made to any other end mill 1 without departing from the gist of the present invention.

＜切削加工物（machined product）の製造方法＞
次に、限定されない実施形態の切削加工物１０１の製造方法について、上述の限定されない実施形態に係るエンドミル１を用いる場合を例に挙げて詳細に説明する。以下、図１４～図１６を参照しつつ説明する。なお、図１４～図１６においては、切削加工物１０１の製造方法の一例として、被削材１０３への穴あけ加工の工程を図示している。また、視覚的な理解を容易にするため、図１４～図１６において、切削加工物１０１及び被削材１０３については断面視する。<Manufacturing method of machined product>
Next, a method for manufacturing the cut workpiece 101 according to the non-limiting embodiment will be described in detail, taking as an example a case where the end mill 1 according to the above-mentioned non-limiting embodiment is used. This will be explained below with reference to FIGS. 14 to 16. Note that FIGS. 14 to 16 illustrate a process of drilling a hole in a workpiece 103 as an example of a method for manufacturing the cut workpiece 101. Furthermore, in order to facilitate visual understanding, the cut object 101 and the work material 103 are shown in cross-section in FIGS. 14 to 16.

限定されない実施形態にかかる切削加工物１０１の製造方法は、以下の（１）～（３）の工程を備え得る。 A method for manufacturing a cut workpiece 101 according to a non-limiting embodiment may include the following steps (1) to (3).

（１）エンドミル１を、回転軸Ｒ１を中心に矢印Ｒ２の方向に回転させ、被削材１０３に向かってＹ１方向にエンドミル１を近づけてもよい（図１４参照）。 (1) The end mill 1 may be rotated around the rotation axis R1 in the direction of the arrow R2, and the end mill 1 may be brought closer to the workpiece 103 in the Y1 direction (see FIG. 14).

本工程は、例えば、被削材１０３を、エンドミル１を取り付けた工作機械のテーブル上に固定し、エンドミル１を回転した状態で近づけることにより行うことができる。なお、本工程では、被削材１０３とエンドミル１とは相対的に近づけばよく、被削材１０３をエンドミル１に近づけてもよい。 This step can be carried out, for example, by fixing the workpiece 103 on the table of a machine tool to which the end mill 1 is attached, and bringing the end mill 1 close to it in a rotating state. Note that in this step, the workpiece 103 and the end mill 1 may be brought relatively close to each other, and the workpiece 103 may be brought close to the endmill 1.

（２）エンドミル１をさらに被削材１０３に近づけることによって、回転しているエンドミル１を被削材１０３の表面の所望の位置に接触させて、被削材１０３を切削してもよい（図１５参照）。 (2) By bringing the end mill 1 closer to the work material 103, the rotating end mill 1 may be brought into contact with a desired position on the surface of the work material 103 to cut the work material 103 (Fig. 15).

本工程においては、チゼル刃、第１切刃及び第２切刃を被削材１０３の表面の所望の位置に接触させてもよい。 In this step, the chisel blade, the first cutting edge, and the second cutting edge may be brought into contact with a desired position on the surface of the workpiece 103.

（３）エンドミル１を被削材１０３からＹ２方向に離してもよい（図１６参照）。 (3) The end mill 1 may be moved away from the workpiece 103 in the Y2 direction (see FIG. 16).

本工程においても、上述の（１）の工程と同様に、被削材１０３からエンドミル１を相対的に離せばよく、例えば被削材１０３をエンドミル１から離してもよい。なお、切削加工としては、例えば、図１６に示すような穴あけ加工の他にも、貫通しない穴加工、溝加工及びフライス加工などが挙げられ得る。 In this step as well, the end mill 1 may be relatively separated from the work material 103, for example, the work material 103 may be separated from the end mill 1, similarly to the step (1) described above. Note that, in addition to the drilling process shown in FIG. 16, the cutting process may include, for example, non-through hole processing, groove processing, milling, and the like.

以上のような工程を経ることによって、優れた加工性を発揮することが可能である。 By going through the steps described above, it is possible to exhibit excellent workability.

なお、以上に示したような被削材１０３の切削加工を複数回行う場合であって、例えば、１つの被削材１０３に対して複数の切削加工を行う場合には、エンドミル１を回転させた状態を保持しつつ、被削材１０３の異なる箇所にエンドミル１を接触させる工程を繰り返してもよい。 Note that when cutting the workpiece 103 as described above is performed multiple times, for example, when performing multiple cuttings on one workpiece 103, the end mill 1 is rotated. The process of bringing the end mill 1 into contact with different parts of the workpiece 103 while maintaining the same state may be repeated.

１・・・エンドミル
３・・・本体
３ａ・・第１端
３ｂ・・第２端
５・・・チゼル刃
７・・・第１切刃
９・・・第２切刃
９ａ・・内端部
１１・・・第１逃げ面
１３・・・第２逃げ面
１５・・・第１刃溝
１７・・・第１排出溝
１９・・・第１底部
２１・・・第１壁面
２３・・・第２壁面
２５・・・第２刃溝
２７・・・第２底部
２９・・・第３壁面
３１・・・第４壁面
３３・・・第３刃溝
３５・・・第４刃溝
３７・・・第２排出溝
３９・・・第３底部
４１・・・第５壁面
４３・・・第６壁面
４５・・・第４底部
４７・・・第７壁面
４９・・・第８壁面
１０１・・・切削加工物
１０３・・・被削材
Ｒ１・・・回転軸
Ｒ２・・・回転方向
Ｗ・・・幅
Ｌ１・・・稜線（第２逃げ面及び第２壁面）
Ｌ２・・・稜線（第１刃溝及び第２刃溝）
Ｌ３・・・基準線
θ・・・角度（第１刃溝及び第２刃溝の交わる角度）1... End mill 3... Main body 3a... First end 3b... Second end 5... Chisel blade 7... First cutting blade 9... Second cutting blade 9a... Inner end DESCRIPTION OF SYMBOLS 11... 1st flank surface 13... 2nd flank surface 15... 1st blade groove 17... 1st discharge groove 19... 1st bottom part 21... 1st wall surface 23... 2nd wall surface 25... 2nd blade groove 27... 2nd bottom part 29... 3rd wall surface 31... 4th wall surface 33... 3rd blade groove 35... 4th blade groove 37. ...Second discharge groove 39...Third bottom 41...Fifth wall 43...Sixth wall 45...Fourth bottom 47...Seventh wall 49...Eighth wall 101. ... Cutting workpiece 103 ... Work material R1 ... Rotation axis R2 ... Rotation direction W ... Width L1 ... Ridge line (second flank and second wall surface)
L2...Ridge line (first blade groove and second blade groove)
L3...Reference line θ...Angle (angle at which the first blade groove and the second blade groove intersect)

Claims

having a main body extending from a first end to a second end along the rotation axis;
The main body is
a chisel blade located at the first end;
a first cutting edge and a second cutting edge each extending from the chisel blade toward the outer periphery;
a first flank connected to the first cutting edge at the rear in the rotational direction of the rotating shaft;
a second flank connected to the second cutting blade at the rear in the rotation direction of the rotation shaft;
a first cutting groove connected to the first cutting edge at the front in the rotational direction;
a discharge groove located closer to the second end than the first blade groove;
The first blade groove is
the bottom and
a first wall surface located between the bottom portion and the first cutting edge and connected to the discharge groove ;
a second wall surface located in front of the bottom portion in the rotational direction and away from the discharge groove ;
In the end mill, the first wall surface extends closer to the second end than the second wall surface.

having a main body extending from a first end to a second end along the rotation axis;
The main body is
a chisel blade located at the first end;
a first cutting edge and a second cutting edge each extending from the chisel blade toward the outer periphery;
a first flank connected to the first cutting edge at the rear in the rotational direction of the rotating shaft;
a second flank connected to the second cutting blade at the rear in the rotation direction of the rotation shaft;
a first cutting groove connected to the first cutting edge at the front in the rotational direction;
a discharge groove located closer to the second end than the first blade groove;
The first blade groove is
the bottom and
a first wall surface located between the bottom portion and the first cutting edge;
a second wall surface located in front of the bottom portion in the rotational direction;
The first wall surface extends closer to the second end than the second wall surface ,
In the end mill , when viewed from the front of the first end, a ridge line where the second flank and the second wall surface intersect is inclined toward the rear in the rotation direction as the distance from the rotation axis increases.

having a main body extending from a first end to a second end along the rotation axis;
The main body is
a chisel blade located at the first end;
a first cutting edge and a second cutting edge each extending from the chisel blade toward the outer periphery;
a first flank connected to the first cutting edge at the rear in the rotational direction of the rotating shaft;
a second flank connected to the second cutting blade at the rear in the rotation direction of the rotation shaft;
a first cutting groove connected to the first cutting edge at the front in the rotational direction;
a second blade groove connected to the first blade groove at the front in the rotational direction;
a discharge groove located closer to the second end than the first blade groove;
The first blade groove is
the bottom and
a first wall surface located between the bottom portion and the first cutting edge;
a second wall surface located in front of the bottom portion in the rotational direction;
The first wall surface extends closer to the second end than the second wall surface ,
An end mill in which the first wall surface is connected to the second blade groove closer to the second end than an end on the second end side of the second wall surface .

having a main body extending from a first end to a second end along the rotation axis;
The main body is
a chisel blade located at the first end;
a first cutting edge and a second cutting edge each extending from the chisel blade toward the outer periphery;
a first flank connected to the first cutting edge at the rear in the rotational direction of the rotating shaft;
a second flank connected to the second cutting blade at the rear in the rotation direction of the rotation shaft;
a first cutting groove connected to the first cutting edge at the front in the rotational direction;
a second blade groove connected to the first blade groove at the front in the rotational direction;
a discharge groove located closer to the second end than the first blade groove;
the second cutting edge has an inner end connected to the chisel blade;
In a front view of the first end,
A virtual straight line that is perpendicular to the tangent of the second cutting edge at the inner end and passes through the inner end is a reference line,
The first blade groove is located behind the reference line in the rotation direction,
the bottom and
a first wall surface located between the bottom portion and the first cutting edge;
a second wall surface located in front of the bottom portion in the rotational direction;
The first wall surface extends closer to the second end than the second wall surface ,
The second blade groove intersects the reference line .

having a main body extending from a first end to a second end along the rotation axis;
The main body is
a chisel blade located at the first end;
a first cutting edge and a second cutting edge each extending from the chisel blade toward the outer periphery;
a first flank connected to the first cutting edge at the rear in the rotational direction of the rotating shaft;
a second flank connected to the second cutting blade at the rear in the rotation direction of the rotation shaft;
a first cutting groove connected to the first cutting edge at the front in the rotational direction;
a second blade groove connected to the first blade groove at the front in the rotational direction;
a discharge groove located closer to the second end than the first blade groove;
The first blade groove is
the bottom and
a first wall surface located between the bottom portion and the first cutting edge;
a second wall surface located in front of the bottom portion in the rotational direction;
The first wall surface extends closer to the second end than the second wall surface ,
The end mill is characterized in that the angle at which the first blade groove and the second blade groove intersect becomes larger as the angle approaches the second end .

The end mill according to claim 5 , wherein the first blade groove has a portion on the second end side that is smoothly connected to the second blade groove.

The end mill according to any one of claims 1 to 6 , wherein the width of the second wall surface decreases as it approaches the second end.

a step of rotating the end mill according to any one of claims 1 to 7 ;
a step of bringing the rotating end mill into contact with a workpiece;
A method for manufacturing a cut workpiece, comprising the step of separating the end mill from the workpiece.