JP6362517B2

JP6362517B2 - Cutting tools

Info

Publication number: JP6362517B2
Application number: JP2014229266A
Authority: JP
Inventors: 康雄福井
Original assignee: OSG Corp
Current assignee: OSG Corp
Priority date: 2014-11-11
Filing date: 2014-11-11
Publication date: 2018-07-25
Anticipated expiration: 2034-11-11
Also published as: JP2016087771A

Description

本発明は切削工具に関し、特に、軸方向一側から他側に亘って貫通した２つの第１中空孔を有する第１部材と、軸中心に貫通した第２中空孔を備える第２部材とが接合される場合に、その接合強度が十分に確保された切削工具に関するものである。 The present invention relates to a cutting tool, and in particular, a first member having two first hollow holes penetrating from one side in the axial direction to the other side, and a second member having a second hollow hole penetrating in the center of the shaft. The present invention relates to a cutting tool whose bonding strength is sufficiently secured when bonded.

切削工具において、切れ刃を含む第１部材を高速度鋼から形成すると共にシャンク部を含む第２部材を鋼材から形成することで、切削性能の向上と製品コストの抑制とを図る技術が知られている。 In a cutting tool, a technique for improving cutting performance and reducing product cost by forming a first member including a cutting edge from high-speed steel and forming a second member including a shank portion from a steel material is known. ing.

この場合、第１部材と第２部材との接合には、摩擦溶接を利用する方法が知られているが、この方法では、切削工具が軸方向に貫通したオイルホールを備える場合に、第１部材および第２部材に形成したオイルホールが、第１部材と第２部材とを摩擦圧接する際に発生したバリによって塞がれてしまう可能性があった。 In this case, a method using friction welding is known for joining the first member and the second member. In this method, when the cutting tool includes an oil hole penetrating in the axial direction, the first member is used. There is a possibility that the oil holes formed in the member and the second member may be blocked by burrs generated when the first member and the second member are friction-welded.

これに対し、特許文献１には、シャンク部２（第２部材）の接合端面に、オイルホール（第２中空孔）の周囲を軸方向に円形に凹んだ凹部２４を形成することで、切刃部３（第１部材）とシャンク部２（第２部材）とが摩擦圧接された際に発生したバリを凹部２４に収容して、バリがオイルホールを塞ぐことを抑制する技術が開示される。 On the other hand, in Patent Document 1, a recess 24 is formed in the joint end surface of the shank portion 2 (second member) by recessing the periphery of the oil hole (second hollow hole) in a circular shape in the axial direction. A technique is disclosed in which burrs generated when the blade portion 3 (first member) and the shank portion 2 (second member) are friction-welded are accommodated in the recesses 24 and the burrs are prevented from blocking the oil holes. The

特開２０１２−１９２４２６（例えば、段落００２５、第２図など）JP2012-192426 (for example, paragraph 0025, FIG. 2 etc.)

しかしながら、切刃部３（第１部材）が、シャンク部２（第２部材）との接合端面に２つのオイルホール（中空孔）を有するものであると、接合時のバリが、切刃部３（第１部材）のオイルホール（中空孔）を塞がないようにするために、円形に凹んだ凹部２４の外径を２つのオイルホール（中空孔）を含む径寸法に設定する必要があった。そのため、切刃部３（第１部材）とシャンク部２（第２部材）との接合面積が少なくなり、接合部分の強度が低下するという問題点があった。 However, if the cutting edge part 3 (first member) has two oil holes (hollow holes) on the joining end face with the shank part 2 (second member), the burr at the time of joining is the cutting edge part. In order not to block the oil hole (hollow hole) of 3 (first member), it is necessary to set the outer diameter of the concave portion 24 that is recessed in a circle to a diameter including two oil holes (hollow hole). there were. For this reason, there is a problem in that the joining area between the cutting edge portion 3 (first member) and the shank portion 2 (second member) is reduced, and the strength of the joining portion is reduced.

本発明は、上述した問題点を解決するためになされたものであり、軸方向一側から他側に亘って貫通した２つの第１中空孔を有する第１部材と、軸中心に貫通した第２中空孔を備える第２部材とが接合される場合に、その接合強度が十分に確保された切削工具を提供することを目的としている。 The present invention has been made to solve the above-described problems, and includes a first member having two first hollow holes penetrating from one side in the axial direction to the other side, and a first member penetrating in the center of the shaft. An object of the present invention is to provide a cutting tool in which the bonding strength is sufficiently ensured when a second member having two hollow holes is bonded.

Means for Solving the Problems and Effects of the Invention

請求項１記載の切削工具によれば、第１部材は、軸方向一側から他側に亘って貫通した２つの第１中空孔と、一側の端面に軸方向に凹んだ溝部と、一側の端面の外縁から軸方向に凹んだ外縁凹部と、外縁凹部の径方向中央に軸方向に突出した第１突部とを備え、第２部材は軸中心に軸方向一側から他側に亘って貫通した第２中空孔と、第１部材との接合面の外縁から軸方向に突出した第２突部とを備え、溝部は２つの中空孔を連結すると共に軸と直交して形成され、第１突部の外径は第２突部の内径よりも小さく設定されると共に、第１突部の軸方向の距離寸法と第２突部の軸方向の距離寸法とが略同一に形成され、第１部材および第２部材が軸回りに相対回転され軸方向に圧接されることで、第１部材および第２部材の一側同士が当接して接合が行われると共に、第１中空孔と第２中空孔とが、溝部を介して連通され、切削工具の軸方向一側から他側に亘って連通したオイルホールが形成されるので、従来のようにオイルホールの周囲に円形に凹みを形成する場合に比べて、第１部材と第２部材との接合面積を大きくできる。よって、接合面積を大きくできた分、第１部材と第２部材との接合強度を向上できる。また、第１部材と第２部材との接合の際に、第２突部の内側に第１突部が挿入されると、外縁凹部の端面および第２突部の端面が摩擦圧接される面と第１部材の端面および第２部材の端面が摩擦圧接される面とが形成できる。そのため、第１部材および第２部材が摩擦圧接される接合面を軸方向に２か所（２面）形成することができるので、その接合強度を向上できる。 According to the cutting tool of claim 1, the first member includes two first hollow holes penetrating from one side in the axial direction to the other side, a groove portion recessed in the axial direction on one end surface, and one An outer edge recess recessed in the axial direction from the outer edge of the side end surface, and a first protrusion protruding in the axial direction at the radial center of the outer edge recess , the second member extending from one axial direction to the other in the axial center A second hollow hole penetrating therethrough and a second protrusion projecting in the axial direction from the outer edge of the joint surface with the first member, and the groove portion connects the two hollow holes and is orthogonal to the shaft. The outer diameter of the first protrusion is set smaller than the inner diameter of the second protrusion, and the axial distance dimension of the first protrusion and the axial distance dimension of the second protrusion are formed substantially the same. is, that the first member and the second member is pressed against the relative rotation by axially about the axis, one side ends of the first member and the second member is in contact with Since the first hollow hole and the second hollow hole are communicated with each other through the groove portion, an oil hole is formed which is communicated from one side in the axial direction to the other side of the cutting tool. Thus, compared with the case where a dent is formed in a circle around the oil hole, the joining area between the first member and the second member can be increased. Therefore, the joint strength between the first member and the second member can be improved as much as the joint area can be increased. Further, when the first protrusion is inserted inside the second protrusion when the first member and the second member are joined, the end face of the outer edge recess and the end face of the second protrusion are friction-welded. And a surface on which the end surface of the first member and the end surface of the second member are friction-welded can be formed. Therefore, two joint surfaces (two surfaces) in which the first member and the second member are friction-welded can be formed in the axial direction, so that the joint strength can be improved.

請求項２記載の切削工具によれば、請求項１記載の切削工具の奏する効果に加え、第１突部および第２突部は、軸中心に円形状に形成されるので、第２突部の内側に第１突部が挿入されると、第２突部の内面と第１突部の外面との間に円環状の隙間を形成することができる。これにより、第１部材と第２部材との接合で発生するバリを、第２突部の内面と第１突部の外面との隙間に充填できるので、第２突部の内側に発生したバリが、第２突部の内面を押圧して第２突部が径方向に膨張することを抑制できる。 According to the cutting tool according to claim 2, in addition to the effects of the cutting tool according to claim 1 wherein the first projection and second projection are so formed in a circular shape around the axis, the second projection When the first protrusion is inserted inside the ring, an annular gap can be formed between the inner surface of the second protrusion and the outer surface of the first protrusion. As a result, the burr generated by joining the first member and the second member can be filled into the gap between the inner surface of the second protrusion and the outer surface of the first protrusion. However, it can suppress that the 2nd protrusion expands to a radial direction by pressing the inner surface of a 2nd protrusion.

請求項３記載の切削工具によれば、請求項１又は２に記載の切削工具の奏する効果に加え、第１突部は、端面の径方向外側を軸方向に削り取って、階段状に突出した第３突部を備え、第３突部は、その軸方向の距離寸法が第１部材および第２部材を圧接する距離寸法よりも小さく形成され、第１突部よりも外径が小さく形成されるので、第１部材および第２部材が接合される際に、第２部材の端面および第３突部の端面が圧接されて発生するバリと第２部材の端面および第１突部の端面が圧接されて発生するバリとを形成することができる。これにより、バリの形成が分散されるので、一つのバリが径方向外側に突出することを防止できる。これにより、第２突部の内部に形成されるバリが径方向外側に膨らむことを防止して、バリが第２突部の内周面を押圧して第２突部が径方向外側に膨張することを抑制できる。 According to the cutting tool according to claim 3, in addition to the effects of the cutting tool according to claim 1 or 2, the first projection is scraped radially outer end surfaces in the axial direction, projecting stepwise A third protrusion is provided, and the third protrusion is formed such that an axial distance dimension thereof is smaller than a distance dimension for press-contacting the first member and the second member, and an outer diameter is smaller than that of the first protrusion. Therefore, when the first member and the second member are joined, the end surface of the second member and the end surface of the third protrusion are pressed against each other, and the end surface of the second member and the end surface of the first protrusion are It is possible to form burrs generated by pressure contact. Thereby, since formation of a burr | flash is disperse | distributed, it can prevent that one burr | flash protrudes to radial direction outer side. As a result, the burr formed inside the second protrusion is prevented from expanding radially outward, and the burr presses the inner peripheral surface of the second protrusion and the second protrusion expands radially outward. Can be suppressed.

また、第３突部の軸方向寸法は、第１部材および第２部材を圧接する距離寸法よりも小さく形成されるので、第１部材および第２部材との接合面を第１突部とすることができる。よって、第１部材および第２部材の接合面積を変更することなく、バリが第２突部を径方向外側に押し出すことを防止できる。 Moreover, since the axial direction dimension of the 3rd protrusion is formed smaller than the distance dimension which press-contacts a 1st member and a 2nd member, the junction surface with a 1st member and a 2nd member is used as a 1st protrusion. be able to. Therefore, it is possible to prevent the burr from pushing the second protrusion outward in the radial direction without changing the bonding area between the first member and the second member.

請求項４記載の切削工具によれば、請求項１から３のいずれかに記載の切削工具の奏する効果に加え、溝部は、第１中空孔の連結方向の両端が第１突部の外周面に開放されるので、第１中空孔付近で接合される面積を減らすことができる。すなわち、第１中空孔付近でバリが発生して、バリが第１中空孔を塞ぐこと事を抑制できる。 According to the cutting tool of Claim 4 , in addition to the effect which the cutting tool in any one of Claim 1 to 3 shows, the groove part is the outer peripheral surface of a 1st protrusion in the both ends of the connection direction of a 1st hollow hole. Therefore, the area joined in the vicinity of the first hollow hole can be reduced. That is, it can be suppressed that burrs are generated near the first hollow holes and the burrs block the first hollow holes.

また、溝部の両端と第１突部の外周面とが近接した位置に形成されるので、溝部の両端が第１突部の外周面に開放しない場合、溝部の両端の第１突部の剛性が低くなる。一方、溝部の両端が開放されるので、第１部材および第２部材の接合の際に第１突部が破損することを防止できる。 In addition, since both ends of the groove and the outer peripheral surface of the first protrusion are formed close to each other, if both ends of the groove do not open to the outer peripheral surface of the first protrusion, the rigidity of the first protrusion at both ends of the groove Becomes lower. On the other hand, since both ends of the groove portion are opened, it is possible to prevent the first protrusion from being damaged when the first member and the second member are joined.

第１実施形態における切削工具の正面図である。It is a front view of the cutting tool in a 1st embodiment. （ａ）は、第１部材の上面図であり、（ｂ）は、図２（ａ）のＩＩｂ−ＩＩｂ線における第１部材の部分拡大断面図である。（ｃ）は、第２部材の底面図であり、（ｄ）は、図２（ｃ）のＩＩｄ−ＩＩｄ線における第２部材の部分拡大断面図である。(A) is a top view of a 1st member, (b) is the elements on larger scale of the 1st member in the IIb-IIb line | wire of Fig.2 (a). (C) is a bottom view of a 2nd member, (d) is the elements on larger scale of the 2nd member in the IId-IId line | wire of FIG.2 (c). （ａ）から（ｄ）は、第１部材および第２部材の断面図である。(A) to (d) is a sectional view of the first member and the second member. （ａ）は、第２実施形態における第１部材の上面図であり、（ｂ）は、図４（ａ）のＩＶｂ−ＩＶｂ線における第１部材の部分拡大断面図である。（ｃ）は、第２部材の底面図であり、（ｄ）は、図４（ｃ）のＩＶｄ−ＩＶｄ線における第２部材の部分拡大断面図である。(A) is a top view of the 1st member in 2nd Embodiment, (b) is the elements on larger scale of the 1st member in the IVb-IVb line | wire of Fig.4 (a). (C) is a bottom view of the second member, and (d) is a partial enlarged cross-sectional view of the second member taken along line IVd-IVd in FIG. 4 (c). （ａ）から（ｄ）は、第１部材および第２部材の断面図である。(A) to (d) is a sectional view of the first member and the second member. （ａ）は、第３実施形態における第１部材の上面図であり、（ｂ）は、図６（ａ）のＶＩｂ−ＶＩｂ線における第１部材の部分拡大断面図であり、（ｃ）は、図６（ａ）のＶＩｃ−ＶＩｃ線における第１部材の部分拡大断面図である。(A) is a top view of the 1st member in 3rd Embodiment, (b) is the elements on larger scale of the 1st member in the VIb-VIb line | wire of Fig.6 (a), (c) is FIG. 7 is a partially enlarged cross-sectional view of the first member taken along the line VIc-VIc in FIG. （ａ）から（ｃ）は、第１部材および第２部材の断面図である。(A) to (c) is a sectional view of the first member and the second member.

以下、本発明の第１実施形態について、添付図面を参照して説明する。図１は、本発明の第１実施形態における切削工具１００の正面図である。図１に示すように、切削工具１００は、高速度鋼から形成されると共に切れ刃１１を有する第１部材１０と、鋼材から形成されると共にシャンク部２１を有する第２部材２０と、を備えて構成される。なお、本実施形態では、第１部材１０及び第２部材２０は、それぞれ直径３２ｍｍで形成される。 Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a cutting tool 100 according to the first embodiment of the present invention. As shown in FIG. 1, the cutting tool 100 includes a first member 10 formed of high-speed steel and having a cutting edge 11, and a second member 20 formed of steel and having a shank portion 21. Configured. In the present embodiment, the first member 10 and the second member 20 are each formed with a diameter of 32 mm.

次に、図２を参照して、第１部材１０及び第２部材２０について説明する。図２（ａ）は、第１部材１０の上面図であり、図２（ｂ）は、図２（ａ）のＩＩｂ−ＩＩｂ線における第１部材１０の部分拡大断面図である。図２（ｃ）は、第２部材２０の底面図であり、図２（ｄ）は、図２（ｃ）のＩＩｄ−ＩＩｄ線における第２部材２０の部分拡大断面図である。なお、図２及び図３では理解を容易とするために、第１中空孔１２及び第２中空孔２２の直径を実際よりも小さい寸法で図示している。また、図４以降の図面においても同様に、第１中空孔１２及び第２中空孔２２の直径を実際よりも小さい寸法で図示している。 Next, the first member 10 and the second member 20 will be described with reference to FIG. 2A is a top view of the first member 10, and FIG. 2B is a partially enlarged cross-sectional view of the first member 10 taken along the line IIb-IIb in FIG. 2A. 2C is a bottom view of the second member 20, and FIG. 2D is a partially enlarged cross-sectional view of the second member 20 taken along the line IId-IId in FIG. 2C. 2 and 3, the diameters of the first hollow hole 12 and the second hollow hole 22 are illustrated with dimensions smaller than the actual dimensions in order to facilitate understanding. Further, in the drawings subsequent to FIG. 4, the diameters of the first hollow hole 12 and the second hollow hole 22 are similarly illustrated with dimensions smaller than actual dimensions.

図２（ａ）及び図２（ｂ）に示すように、第１部材１０は、一側から他側に亘って軸方向に貫通した２本の第１中空孔１２が形成される。また、第１部材１０の一側（図２（ｂ）上方）の端面には、軸方向に凹んだ溝部１３が形成される。 As shown in FIG. 2A and FIG. 2B, the first member 10 has two first hollow holes 12 penetrating in the axial direction from one side to the other side. A groove 13 that is recessed in the axial direction is formed on the end surface of one side of the first member 10 (upward in FIG. 2B).

第１中空孔１２は、切削工具１００を使用して被加工物を切削する際に切削液を切削部分に供給する孔であり、他側は、切れ刃１１の先端面（すくい面）に開口する（図１参照）。また、切れ刃１１の形状に倣って一側から他側に向かうにつれて、軸周りに回転して形成される。なお、本実施形態では、第１中空孔１２の穴径が直径５ｍｍで形成される。 The first hollow hole 12 is a hole for supplying a cutting fluid to a cutting portion when the workpiece is cut using the cutting tool 100, and the other side is opened on the tip surface (rake face) of the cutting edge 11. (See FIG. 1). Moreover, it rotates around an axis | shaft and it is formed as it goes to the other side from one side according to the shape of the cutting edge 11. FIG. In the present embodiment, the first hollow hole 12 is formed with a diameter of 5 mm.

溝部１３は、上面視において、第１中空孔１２の直径と略同一の幅寸法（図２（ａ）上下方向寸法）の長穴形状に形成される。さらに、２本の第１中空孔１２を連結して形成され、その連結方向（図２（ａ）左右方向）は軸と直交する。また、溝部１３は、後述する第１部材１０及び第２部材２０を接合する際に圧接する距離寸法よりも３ｍｍから５ｍｍ軸方向に深い距離寸法で形成される。なお、本実施形態では、溝部１３の軸方向の深さ寸法が１０ｍｍで形成され、第１部材１０及び第２部材２０を圧接する距離寸法が７ｍｍに設定される。 The groove portion 13 is formed in an elongated hole shape having a width dimension (dimension in the vertical direction in FIG. 2A) substantially the same as the diameter of the first hollow hole 12 when viewed from above. Furthermore, it forms by connecting the two 1st hollow holes 12, The connection direction (FIG. 2 (a) left-right direction) is orthogonal to an axis | shaft. Further, the groove 13 is formed with a distance dimension that is 3 mm to 5 mm deeper in the axial direction than the distance dimension that is pressed when the first member 10 and the second member 20 described later are joined. In the present embodiment, the depth dimension in the axial direction of the groove portion 13 is 10 mm, and the distance dimension for press-contacting the first member 10 and the second member 20 is set to 7 mm.

図２（ｃ）及び図２（ｄ）に示すように、第２部材２０は、一側から他側に亘って貫通した第２中空孔２２が、軸中心に形成される。なお、第２中空孔２２は、切削液が流れるための流路であり、上述した２本の第１中空孔１２と連通する孔である。そのため、第１中空孔１２の直径よりも大きく、第１中空孔１２の直径の略２倍よりも小さな直径に形成されることが好ましい。第２中空孔２２の直径が、第１中空孔１２の直径よりも大きく形成されることで、第２中空孔２２から第１中空孔１２に流れる切削液の流量を確保できる。また、第２中空孔２２の直径が、第１中空孔１２の直径の略２倍に大きく形成されることで、溝部１３の形成位置に誤差が生じた際にその誤差を吸収して、第２中空孔２２から第１中空孔１２に流れる切削液の流量を安定させることができる。ここで、溝部１３の形成位置の誤差を吸収するには第２中空孔２２の直径をできるだけ大きく形成する方が好ましいが、第２中空孔２２の直径を大きく形成すると、その分、第１部材１０と第２部材との接合面積が少なくなり第１部材１０及び第２部材２０の接合強度が低下するところ、第２中空孔２２の直径を第１中空孔１２の直径の略２倍までの範囲とすることで、第１部材１０及び第２部材２０の接合面積を確保すると共に、第２中空孔２２から第１中空孔１２に流れる切削液の流量を確保できる。 As shown in FIG. 2C and FIG. 2D, the second member 20 is formed with a second hollow hole 22 penetrating from one side to the other side at the center of the shaft. The second hollow hole 22 is a flow path through which the cutting fluid flows, and is a hole communicating with the two first hollow holes 12 described above. Therefore, it is preferable that the diameter is larger than the diameter of the first hollow hole 12 and smaller than about twice the diameter of the first hollow hole 12. By forming the diameter of the second hollow hole 22 to be larger than the diameter of the first hollow hole 12, the flow rate of the cutting fluid flowing from the second hollow hole 22 to the first hollow hole 12 can be secured. Further, since the diameter of the second hollow hole 22 is formed to be approximately twice as large as the diameter of the first hollow hole 12, when an error occurs in the formation position of the groove 13, the error is absorbed, The flow rate of the cutting fluid flowing from the second hollow hole 22 to the first hollow hole 12 can be stabilized. Here, in order to absorb the error of the formation position of the groove portion 13, it is preferable to make the diameter of the second hollow hole 22 as large as possible. However, if the diameter of the second hollow hole 22 is made large, the first member is correspondingly increased. When the bonding area between the first member 10 and the second member 20 is reduced and the bonding strength between the first member 10 and the second member 20 is reduced, the diameter of the second hollow hole 22 is approximately twice the diameter of the first hollow hole 12. By setting the range, it is possible to secure the joining area of the first member 10 and the second member 20 and to secure the flow rate of the cutting fluid flowing from the second hollow hole 22 to the first hollow hole 12.

次に、図３を参照して、第１部材１０及び第２部材２０の接合について説明する。図３（ａ）から図３（ｄ）は、切削工具１００が摩擦溶接により接合される様子を時系列で図示した第１部材１０及び第２部材２０の断面図である。なお、図３（ｄ）は、図１（ａ）のＩＩＩｄ−ＩＩＩｄ線における切削工具１００の断面図に対応する。 Next, the joining of the first member 10 and the second member 20 will be described with reference to FIG. FIG. 3A to FIG. 3D are cross-sectional views of the first member 10 and the second member 20 illustrating in time series how the cutting tool 100 is joined by friction welding. FIG. 3D corresponds to a cross-sectional view of the cutting tool 100 taken along the line IIId-IIId in FIG.

初めに、図３（ａ）に示すように、第１部材１０と第２部材２０とが図示しない摩擦圧接機構によって隙間を空けて配置される。また、第１部材１０と第２部材２０とが同軸に配置される。 First, as shown in FIG. 3A, the first member 10 and the second member 20 are arranged with a gap therebetween by a friction welding mechanism (not shown). Moreover, the 1st member 10 and the 2nd member 20 are arrange | positioned coaxially.

次に、図３（ｂ）に示すように摩擦圧接機構の第２部材２０を第１部材１０側に軸方向にスライド移動させると共に、第２部材２０を軸中心に周方向に回転させる。これにより、第２部材２０の一側（図３（ａ）から（ｄ）左方）の端面を第１部材１０の一側（図３（ａ）から（ｄ）右方）の端面に押し付けることで、第２部材２０の一側と第１部材１０の一側とに摩擦熱を発生させる。 Next, as shown in FIG. 3B, the second member 20 of the friction welding mechanism is slid in the axial direction toward the first member 10, and the second member 20 is rotated in the circumferential direction about the axis. Thereby, the end surface of one side (FIG. 3 (a) to (d) left) of the second member 20 is pressed against the end surface of one side (FIG. 3 (a) to (d) right) of the first member 10. Thus, frictional heat is generated on one side of the second member 20 and one side of the first member 10.

図３（ｃ）に示すように、第１部材１０と第２部材２０との間に発生した摩擦熱により、第１部材１０の一側と第２部材２０の一側とが十分に軟化した後に、軸中心に周方向に回転していた第２部材２０の回転を急停止させ、第２部材２０を第１部材１０側へさらに圧接する（押し付ける）。これにより、第１部材１０の一側と第２部材２０の一側とが塑性変形して接合される。また、摩擦溶接により接合された第１部材１０及び第２部材２０の接合面には、径方向外側に突出して形成されるバリＡと径方向内側に突出して形成されるバリＢとが形成される。 As shown in FIG. 3C, one side of the first member 10 and one side of the second member 20 are sufficiently softened by the frictional heat generated between the first member 10 and the second member 20. Later, the rotation of the second member 20 rotating in the circumferential direction about the axis is suddenly stopped, and the second member 20 is further pressed (pressed) toward the first member 10 side. Accordingly, one side of the first member 10 and one side of the second member 20 are plastically deformed and joined. In addition, burrs A formed to protrude radially outward and burrs B formed to protrude radially inward are formed on the joint surfaces of the first member 10 and the second member 20 joined by friction welding. The

ここで、上述したように、第１部材１０の溝部１３の軸方向の凹み寸法が第１部材１０と第２部材２０との圧接距離寸法（アプセット寸法）よりも深く形成されるので、第１中空孔１２と第２中空孔２２との間に溝部１３が介設される。また、溝部１３が軸中心と直交して形成され、第２中空孔２２が軸中心に形成されるので、第１中空孔１２と第２中空孔２２との間に確実に溝部１３が介設される。これにより、第１中空孔１２と第２中空孔２２とが溝部１３を介して連通されて、切削工具１００の一側から他側に連通開口したオイルホールが形成される。 Here, as described above, since the recess dimension in the axial direction of the groove portion 13 of the first member 10 is formed deeper than the pressure contact distance dimension (upset dimension) between the first member 10 and the second member 20, the first A groove 13 is interposed between the hollow hole 12 and the second hollow hole 22. Further, since the groove portion 13 is formed orthogonal to the axial center and the second hollow hole 22 is formed at the axial center, the groove portion 13 is reliably interposed between the first hollow hole 12 and the second hollow hole 22. Is done. Thereby, the 1st hollow hole 12 and the 2nd hollow hole 22 are connected via the groove part 13, and the oil hole open | released from one side to the other side by the cutting tool 100 is formed.

最後に、図３（ｄ）に示すように、径方向外側に突出したバリＡを切削加工によって除去して切削工具１００が形成される。一方、径方向内側に突出したバリＢは、溝部１３の端面（底面）と第２部材２０の一側の端面との間に収められる。 Finally, as shown in FIG. 3D, the cutting tool 100 is formed by removing the burrs A protruding outward in the radial direction by cutting. On the other hand, the burr B protruding inward in the radial direction is stored between the end face (bottom face) of the groove 13 and the end face on one side of the second member 20.

ここで、径方向内側に突出したバリＢが、大きく突出して第１中空孔１２を塞いでしまうことが考えられるが、本実施形態の場合、上述したように、溝部１３の軸方向の凹み寸法が第１部材１０と第２部材２０との圧接距離寸法（アプセット寸法）よりも深く形成されるので、バリＢと溝部１３の端面との間にバリＢを収容する隙間を形成できる。これにより、バリＢが第１中空孔１２を塞ぐことを防止できる。 Here, it is conceivable that the burr B protruding radially inwardly protrudes and closes the first hollow hole 12, but in the case of the present embodiment, as described above, the axial recess size of the groove portion 13 is considered. Is formed deeper than the pressure contact distance dimension (upset dimension) between the first member 10 and the second member 20, a gap for accommodating the burr B can be formed between the burr B and the end surface of the groove portion 13. Thereby, it is possible to prevent the burr B from closing the first hollow hole 12.

また、第１部材１０及び第２部材２０の軸中心においては、溝部１３の軸方向に凹んだ空間と第２部材２０の第２中空孔２２の空間とが常に隣合うため摩擦による熱が発生することを抑制できる。これにより、第２部材２０の第２中空孔２２の周囲が塑性変形することを抑制でき、第２中空孔２２の周囲にバリが形成されることを抑制できる。その結果、オイルホール内を切削液が流れる場合に、バリによって切削液の流れが阻害されることを抑制できる。 In addition, at the axial center of the first member 10 and the second member 20, the space recessed in the axial direction of the groove portion 13 and the space of the second hollow hole 22 of the second member 20 are always adjacent to each other, so heat due to friction is generated. Can be suppressed. Thereby, it can suppress that the circumference | surroundings of the 2nd hollow hole 22 of the 2nd member 20 deform | transform plastically, and can suppress that a burr | flash is formed around the 2nd hollow hole 22. FIG. As a result, when the cutting fluid flows in the oil hole, it is possible to suppress the flow of the cutting fluid from being hindered by burrs.

以上のように形成された切削工具１００は、溝部１３を除く第１部材１０の一側の端面（図２（ａ）正面側の面）および第２中空孔２２を除く第２部材２０の端面（図２（ｃ）正面側の面）を接合面にすることができ、第１部材１０と第２部材２０との接合面を増やすことができるので、接合面が増加した分、切削工具１００の強度を増加することができる。 The cutting tool 100 formed as described above has an end surface on one side of the first member 10 excluding the groove 13 (a surface on the front side in FIG. 2A) and an end surface of the second member 20 excluding the second hollow hole 22. (The front side surface in FIG. 2 (c)) can be used as a joining surface, and the joining surface between the first member 10 and the second member 20 can be increased. The strength of can be increased.

次に、図４及び図５を参照して、第２実施形態における切削工具２００について説明する。第１実施形態では、第１部材１０に溝部１３が形成されて、第１部材１０及び第２部材２０が摩擦圧接される場合を説明したが、第２実施形における切削工具２００は、第１部材２１０の一側の端面中央から軸方向に突出する第１突部が形成され、第２部材２２０の一側の端面の縁部から突出する第２突部が形成される。なお、上述した第１実施形態と同一の部分には同一の符号を付して、その説明は省略する。 Next, the cutting tool 200 in 2nd Embodiment is demonstrated with reference to FIG.4 and FIG.5. In 1st Embodiment, although the groove part 13 was formed in the 1st member 10 and the case where the 1st member 10 and the 2nd member 20 were friction-welded was demonstrated, the cutting tool 200 in 2nd Embodiment form is 1st. A first protrusion protruding in the axial direction from the center of the end surface on one side of the member 210 is formed, and a second protrusion protruding from an edge of the end surface on the one side of the second member 220 is formed. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

図４（ａ）は、第２実施形態における第１部材２１０の上面図であり、図４（ｂ）は、図４（ａ）のＩＶｂ−ＩＶｂ線における第１部材２１０の部分拡大断面図である。図４（ｃ）は、第２部材２２０の底面図であり、図４（ｄ）は、図４（ｃ）のＩＶｄ−ＩＶｄ線における第２部材２２０の部分拡大断面図である。 4A is a top view of the first member 210 in the second embodiment, and FIG. 4B is a partially enlarged cross-sectional view of the first member 210 taken along line IVb-IVb in FIG. 4A. is there. 4C is a bottom view of the second member 220, and FIG. 4D is a partial enlarged cross-sectional view of the second member 220 taken along line IVd-IVd in FIG. 4C.

図４（ａ）及び図４（ｂ）に示すように、第２実施形態の第１部材２１０は、一側（図４（ｂ）上方）の端面の外縁が軸方向に凹んだ外縁凹部２１４が形成される。これにより、第１部材２１０の軸中央部分に外縁凹部２１４の端面から軸方向に突出した第１突部２１５が形成される。すなわち、第１突部２１５は、上面視において軸中心に円形状に形成される。 As shown in FIGS. 4A and 4B, the first member 210 according to the second embodiment has an outer edge recess 214 in which the outer edge of the end surface on one side (upper side in FIG. 4B) is recessed in the axial direction. Is formed. As a result, a first protrusion 215 that protrudes in the axial direction from the end surface of the outer edge recess 214 is formed at the axial center portion of the first member 210. That is, the first protrusion 215 is formed in a circular shape about the axis center when viewed from above.

第１突部２１５は、図４（ａ）及び図４（ｂ）に示すように、一側（図４（ｂ）上方）の端面から軸方向に凹んだ溝部２１３が形成される。また、溝部２１３の端面には、２つの第１中空孔１２の一側が開口する。 As shown in FIGS. 4A and 4B, the first protrusion 215 is formed with a groove 213 that is recessed in the axial direction from the end surface on one side (upper side in FIG. 4B). Further, one side of the two first hollow holes 12 opens at the end face of the groove portion 213.

溝部２１３は、上面視において、第１中空孔１２の直径よりも大きい幅寸法（図４（ａ）上下方向寸法）に形成される。さらに、上述したように２本の第１中空孔１２を連結して形成され、その連結方向（図４（ａ）左右方向）は軸と直交する。 The groove 213 is formed to have a width dimension (dimension in the vertical direction in FIG. 4A) larger than the diameter of the first hollow hole 12 when viewed from above. Further, as described above, the two first hollow holes 12 are connected to each other, and the connecting direction (the left-right direction in FIG. 4A) is orthogonal to the axis.

また、溝部２１３は、２本の第１中空孔１２を連結した連結方向の一側と他側とが、第１突部２１５の径方向外側に開放される。これにより、溝部２１３と第１突部２１５との間が部分的に薄くなることを防止して、第１部材２１０と第２部材２２０との摩擦溶接の際に第１突部２１５が破損することを防止できる。なお、本実施形態の溝部２１３の幅寸法（図４（ａ）上下方向寸法）は６ｍｍで形成され、軸方向の凹み寸法（図４（ｂ）上下方向寸法）が１０ｍｍで形成される。 Further, the groove portion 213 has one side and the other side in the connecting direction in which the two first hollow holes 12 are connected open to the outside in the radial direction of the first protrusion 215. Accordingly, the gap between the groove 213 and the first protrusion 215 is prevented from being partially thinned, and the first protrusion 215 is damaged when the first member 210 and the second member 220 are friction welded. Can be prevented. In addition, the width dimension (FIG. 4 (a) vertical dimension) of the groove part 213 of this embodiment is formed by 6 mm, and the axial dent dimension (FIG. 4 (b) vertical dimension) is formed by 10 mm.

外縁凹部２１４は、溝部２１３の軸方向の凹み寸法よりも大きい寸法の凹み寸法で形成される。また、外縁凹部２１４の径方向の凹み寸法は、後述する第２部材２２０の第２突部２２３の径方向の厚み寸法よりも大きく形成される。本実施形態では、外縁凹部２１４の軸方向の凹み寸法が１２ｍｍに形成され、径方向の凹み寸法が６ｍｍに形成される。 The outer edge recess 214 is formed with a recess size larger than the axial recess size of the groove 213. Moreover, the radial dimension of the outer edge recess 214 is formed larger than the radial thickness dimension of the second protrusion 223 of the second member 220 described later. In the present embodiment, the outer edge recess 214 has an axial recess dimension of 12 mm and a radial recess dimension of 6 mm.

第２部材２２０は、図４（ｃ）及び図４（ｄ）に示すように、軸方向に貫通した第２中空孔２２が形成される。また、第２部材２２０は、一側（図４（ｂ）の下方）の端面の外縁から軸方向に突出した第２突部２２３が形成される。すなわち、第２突部２２３は、底面視において軸中心に円形状に形成される。 As shown in FIGS. 4C and 4D, the second member 220 has a second hollow hole 22 penetrating in the axial direction. Further, the second member 220 is formed with a second protrusion 223 that protrudes in the axial direction from the outer edge of the end surface on one side (below in FIG. 4B). That is, the second protrusion 223 is formed in a circular shape about the axis center when viewed from the bottom.

第２突部２２３は、突出寸法が外縁凹部２１４の軸方向の凹み寸法と略同一に形成され、径方向の厚み寸法が上述したように第１部材２１０の外縁凹部２１４の径方向の凹み寸法よりも小さく形成される。本実施形態では、第２突部２２３の径方向の厚み寸法が３ｍｍに形成される。 The second protrusion 223 has a protrusion dimension that is substantially the same as the axial recess dimension of the outer edge recess 214, and the radial thickness dimension of the outer edge recess 214 of the first member 210 is the radial recess dimension as described above. Is formed smaller. In the present embodiment, the radial thickness of the second protrusion 223 is 3 mm.

次に、図５を参照して、第１部材２１０及び第２部材２２０の接合について説明する。図５（ａ）から図５（ｄ）は、切削工具２００が摩擦溶接により接合される様子を時系列で図示した第１部材２１０及び第２部材２２０の断面図である。なお、図５（ｄ）は、図３（ｄ）に対応する。 Next, the joining of the first member 210 and the second member 220 will be described with reference to FIG. FIG. 5A to FIG. 5D are cross-sectional views of the first member 210 and the second member 220 illustrating how the cutting tool 200 is joined by friction welding in time series. Note that FIG. 5D corresponds to FIG.

初めに、図５（ａ）に示すように、第１部材２１０と第２部材２２０とが図示しない摩擦圧接機構によって隙間を空けて配置される。また、第１部材２１０と第２部材２２０とが同軸に配置される。 First, as shown in FIG. 5A, the first member 210 and the second member 220 are arranged with a gap therebetween by a friction welding mechanism (not shown). Further, the first member 210 and the second member 220 are arranged coaxially.

次に、図５（ｂ）に示すように、摩擦圧接機構により第２部材２２０を第１部材２１０側に軸方向にスライド移動させると共に、第２部材２２０を軸中心に周方向に回転させる。
よって、上述したように、外縁凹部２１４の軸方向の凹み寸法と第２突部２２３の突出寸法とが略同一に形成されるので、第１突部２１５を第２突部２２３の内側に挿入すると共に、第２部材２２０の一側の端面（第２部材２２０から第２突部２２３を除いた端面）を第１部材２１０の一側の端面（第１突部２１５の端面）に押し付けて、第２部材２２０の一側と第１部材２１０の一側との間に摩擦熱を発生させる。 Next, as shown in FIG. 5B, the second member 220 is slid in the axial direction toward the first member 210 by the friction welding mechanism, and the second member 220 is rotated in the circumferential direction about the axis.
Therefore, as described above, since the recess size in the axial direction of the outer edge recess 214 and the protrusion size of the second protrusion 223 are formed substantially the same, the first protrusion 215 is inserted inside the second protrusion 223. At the same time, the one end surface of the second member 220 (the end surface of the second member 220 excluding the second protrusion 223) is pressed against the one end surface of the first member 210 (the end surface of the first protrusion 215). Then, frictional heat is generated between one side of the second member 220 and one side of the first member 210.

さらに、第２部材２２０の一側の端面（第２部材２２０から第２突部２２３を除いた端面）を第１部材２１０の一側の端面（第１突部２１５の端面）に押し付けると共に、外縁凹部２１４の端面に第２突部２２３の端面を押し付けることができる。よって、外縁凹部２１４の端面と第２突部２２３の端面との間に摩擦熱を発生させることができる。 Furthermore, while pressing the end surface on one side of the second member 220 (the end surface excluding the second protrusion 223 from the second member 220) against the end surface on one side of the first member 210 (end surface of the first protrusion 215), The end surface of the second protrusion 223 can be pressed against the end surface of the outer edge recess 214. Therefore, frictional heat can be generated between the end surface of the outer edge recess 214 and the end surface of the second protrusion 223.

図５（ｃ）に示すように、第１部材２１０の一側の端面および第２部材２２０の一側の端面と外縁凹部２１４の端面および第２突部２２３の端面とが上述した摩擦熱により十分に軟化した後に、軸中心に周方向に回転していた第２部材２２０の回転を急停止させ、第２部材２２０を第１部材２１０側へさらに圧接する（押し付ける）。これにより、第１部材２１０の一側の端面および第２部材２２０の一側の端面と外縁凹部２１４の端面および第２突部２２３の端面とが塑性変形して、第１部材２１０と第２部材２２０とが接合される。また、第１部材２１０の一側の端面および第２部材２２０の端面の接合面には、径方向外側に突出したバリＤが形成される。外縁凹部２１４の端面および第２突部２２３の端面の接合面には、径方向外側に突出したバリＣと径方向内側に突出したバリＥとが形成される。 As shown in FIG. 5C, the end surface on one side of the first member 210 and the end surface on one side of the second member 220, the end surface of the outer edge recess 214, and the end surface of the second protrusion 223 are caused by the frictional heat described above. After sufficiently softening, the rotation of the second member 220 that has been rotating in the circumferential direction about the axis is suddenly stopped, and the second member 220 is further pressed (pressed) toward the first member 210. As a result, the end surface on one side of the first member 210 and the end surface on one side of the second member 220, the end surface of the outer edge recess 214 and the end surface of the second protrusion 223 are plastically deformed, and the first member 210 and the second member The member 220 is joined. Further, a burr D protruding outward in the radial direction is formed on the joint surface between the one end surface of the first member 210 and the end surface of the second member 220. A burr C projecting radially outward and a burr E projecting radially inward are formed on the joint surface between the end face of the outer edge recess 214 and the end face of the second protrusion 223.

この場合、第１部材２１０の溝部２１３の軸方向の凹み寸法が、第１部材２１０と第２部材２２０との圧接距離寸法（アプセット寸法）よりも大きく形成されるので、第１部材２１０の第１中空孔１２と第２部材２２０の第２中空孔２２との間に溝部２１３が介設される。これにより、第１中空孔１２と第２中空孔２２とが溝部２１３を介して連通されて、切削工具１００の一側から他側に連通開口したオイルホールが形成される。 In this case, the dimension of the recess in the axial direction of the groove portion 213 of the first member 210 is formed larger than the pressure contact distance dimension (upset dimension) between the first member 210 and the second member 220. A groove 213 is interposed between the first hollow hole 12 and the second hollow hole 22 of the second member 220. Thereby, the 1st hollow hole 12 and the 2nd hollow hole 22 are connected via the groove part 213, and the oil hole open | released from one side to the other side by the cutting tool 100 is formed.

最後に、図５（ｄ）に示すように、径方向外側に突出したバリＣを切削加工によって除去して切削工具２００が形成される。 Finally, as shown in FIG. 5D, the cutting tool 200 is formed by removing the burrs C protruding outward in the radial direction by cutting.

ここで、外縁凹部２１４の径方向の凹み寸法が、第２突部２２３の径方向の厚み寸法よりも大きく設定されるので、第１突部２１５の外周面と第２突部２２３の内周面との間の空間に隙間２４０が形成される。隙間２４０に、第１部材２１０及び第２部材２２０の外面よりも内側に形成するバリＤ及びバリＥを収めることで、バリＤ及びバリＥが溝部２１３の内側に形成されることを防止できる。その結果、バリＤ及びバリＥが第１中空孔１２を塞ぐことを防止できる。 Here, since the radial recess dimension of the outer edge recess 214 is set larger than the radial thickness dimension of the second protrusion 223, the outer peripheral surface of the first protrusion 215 and the inner periphery of the second protrusion 223 are set. A gap 240 is formed in the space between the surfaces. By accommodating the burrs D and burrs E formed inside the outer surfaces of the first member 210 and the second member 220 in the gap 240, the burrs D and burrs E can be prevented from being formed inside the groove portion 213. As a result, it is possible to prevent the burr D and the burr E from blocking the first hollow hole 12.

さらに、隙間２４０にバリＤを収めるので、径方向外側に突出したバリＤが第２突部２２３を径方向外側に押圧して、第２突部２２３が径方向外側に押し出されることを防止できる。 Further, since the burr D is accommodated in the gap 240, it is possible to prevent the burr D protruding outward in the radial direction from pressing the second protrusion 223 outward in the radial direction and pushing out the second protrusion 223 outward in the radial direction. .

また、溝部２１３の第１中空孔１２を連結した方向（図５（ａ）から図５（ｄ）上下方向）の一側と他側とが第１中空孔１２に近接して形成されるので、溝部２１３の一側と他側とを第１突部２１５の径方向外側に開放することで、塑性変形する部分がない分、第１中空孔１２の近傍にバリが発生することを抑制することができる。これにより、第１中空孔１２がバリで塞がれることを防止できる。 In addition, since one side and the other side of the direction in which the first hollow hole 12 of the groove portion 213 is connected (the vertical direction in FIG. 5A to FIG. 5D) are formed close to the first hollow hole 12. By opening one side and the other side of the groove portion 213 outward in the radial direction of the first protrusion 215, the occurrence of burrs in the vicinity of the first hollow hole 12 is suppressed because there is no plastic deformation portion. be able to. Thereby, it is possible to prevent the first hollow hole 12 from being blocked by burrs.

以上のように形成された切削工具２００は、上述したように、第１部材２１０の一側の端面および第２部材２２０の一側の端面と外縁凹部２１４の端面および第２突部２２３の端面とが塑性変形して、第１部材２１０及び第２部材２２０が接合される。その結果、第１部材２１０及び第２部材２２０の接合部分を軸方向に異なった位置に２箇所形成できる。そのため、接合部分にかかる応力を軸方向に分散することができ、接合強度を向上でき、切削工具２００の強度を向上できる。 As described above, the cutting tool 200 formed as described above includes the end surface on one side of the first member 210, the end surface on one side of the second member 220, the end surface of the outer edge recess 214, and the end surface of the second protrusion 223. And the first member 210 and the second member 220 are joined. As a result, two joining portions of the first member 210 and the second member 220 can be formed at different positions in the axial direction. Therefore, the stress applied to the joint portion can be dispersed in the axial direction, the joint strength can be improved, and the strength of the cutting tool 200 can be improved.

次に、図６及び図７を参照して、第３実施形態における切削工具３００について説明する。第２実施形態では、第１部材２１０に第１突部２１５が形成される場合を説明したが、第３実施形態では、第１突部２１５の先端縁部を軸方向に削り取って形成された第３突部３１６が形成される場合を説明する。 Next, the cutting tool 300 in 3rd Embodiment is demonstrated with reference to FIG.6 and FIG.7. In 2nd Embodiment, although the case where the 1st protrusion 215 was formed in the 1st member 210 was demonstrated, in 3rd Embodiment, it formed by scraping off the front-end | tip edge part of the 1st protrusion 215 to an axial direction. The case where the 3rd protrusion 316 is formed is demonstrated.

図６（ａ）は、第３実施形態における第１部材３１０の上面図であり、図６（ｂ）は、図６（ａ）のＶＩｂ−ＶＩｂ線における第１部材３１０の部分拡大断面図であり、図６（ｃ）は、図６（ａ）のＶＩｃ−ＶＩｃ線における第１部材３１０の部分拡大断面図である。 6A is a top view of the first member 310 according to the third embodiment, and FIG. 6B is a partially enlarged cross-sectional view of the first member 310 taken along the line VIb-VIb in FIG. 6A. FIG. 6C is a partially enlarged cross-sectional view of the first member 310 taken along the line VIc-VIc in FIG.

図６（ａ）から図６（ｃ）に示すように、第３実施形態における第１部材３１０は、第１突部２１５の端面の径方向外側を軸方向に削り取って、階段状に突出した第３突部３１６を備えている。すなわち、第３突部３１６は、第１突部２１５の外径よりも小さい外径で形成される。 As shown in FIG. 6A to FIG. 6C, the first member 310 in the third embodiment protrudes in a step shape by scraping the radially outer side of the end face of the first protrusion 215 in the axial direction. A third protrusion 316 is provided. That is, the third protrusion 316 is formed with an outer diameter smaller than the outer diameter of the first protrusion 215.

第３突部３１６は、軸方向寸法が第１部材３１０及び第２部材２２０の圧接距離寸法（アプセット寸法）よりも小さい寸法で形成される。すなわち、第３突部３１６は、溝部２１３の軸方向の凹み寸法よりも小さい寸法で形成される。 The third protrusion 316 is formed with a dimension whose axial direction dimension is smaller than the pressure contact distance dimension (upset dimension) of the first member 310 and the second member 220. In other words, the third protrusion 316 is formed with a size smaller than the recess size in the axial direction of the groove 213.

次に、図７を参照して、第１部材３１０及び第２部材２２０の接合について説明する。図７（ａ）から図７（ｃ）は、切削工具３００が摩擦溶接により接合される様子を時系列で図示した第１部材３１０及び第２部材２２０の断面図である。なお、図７（ｄ）は図３（ｄ）に対応する。 Next, the joining of the first member 310 and the second member 220 will be described with reference to FIG. FIG. 7A to FIG. 7C are cross-sectional views of the first member 310 and the second member 220 illustrating how the cutting tool 300 is joined by friction welding in time series. FIG. 7D corresponds to FIG.

ここで、摩擦圧接機構によって第１部材３１０の端面と第２部材２３０の端面とを押し付けて摩擦熱を発生させてからさらに第１部材３１０と第２部材２３０を押し付けて塑性変形させる工程は、第２実施形態と同様であるので、その説明を省略する。 Here, after the friction welding mechanism presses the end surface of the first member 310 and the end surface of the second member 230 to generate frictional heat, the first member 310 and the second member 230 are further pressed and plastically deformed. Since it is the same as that of 2nd Embodiment, the description is abbreviate | omitted.

図７（ａ）及び（ｂ）に示すように、第１部材３１０の一側の端面（第３突部３１６の端面）及び第２部材２２０の一側の端面（図４（ｃ）正面側から第２突部２２３を除いた面）が圧接されて塑性変形すると、第３突部３１６が塑性変形した分が第１突部２１５の径方向外側に突出してバリＦを形成する。 As shown in FIGS. 7A and 7B, one end face of the first member 310 (end face of the third protrusion 316) and one end face of the second member 220 (FIG. 4C front side). When the surface excluding the second protrusion 223 is pressed and plastically deformed, the plastic deformation of the third protrusion 316 protrudes outward in the radial direction of the first protrusion 215 to form a burr F.

次に、図７（ｂ）及び図７（ｃ）に示すように、第３突部３１６が塑性変形した後にさらに第１部材３１０と第２部材２２０とが圧接されると、第１突部２１５が塑性変形した分が径方向外側に突出してバリＧを形成する。よって、バリＦとバリＧとを軸方向に位相の異なる位置に形成できるので、塑性変形したバリＦ及びバリＧが径方向へ大きく突出することを抑制できる。その結果、第１部材３１０及び第２部材２２０の径方向内側に形成されるバリＦ及びバリＧが、径方向外側に突出しない分、バリＦ及びバリＧが第２突部２２３を押圧することを効果的に抑制することができる。 Next, as shown in FIGS. 7B and 7C, when the first member 310 and the second member 220 are further pressure-contacted after the third protrusion 316 is plastically deformed, the first protrusion A portion 215 that is plastically deformed protrudes radially outward to form a burr G. Therefore, since the burr F and the burr G can be formed at positions having different phases in the axial direction, it is possible to suppress the plastically deformed burr F and burr G from protruding greatly in the radial direction. As a result, the burrs F and burrs G formed on the radially inner sides of the first member 310 and the second member 220 do not protrude radially outward, and the burrs F and burrs G press the second protrusions 223. Can be effectively suppressed.

この場合、径方向にバリが突出しない分、第２実施形態よりも第１突部２１５と第２突部２２３との間に形成される隙間２４０を径方向に狭めることができ、第１部材３１０と第２部材２２０との接合面積を増加することができる。その結果、切削工具３００の強度を増加することができる。 In this case, since the burr does not protrude in the radial direction, the gap 240 formed between the first protrusion 215 and the second protrusion 223 can be narrowed in the radial direction as compared with the second embodiment, and the first member The bonding area between 310 and the second member 220 can be increased. As a result, the strength of the cutting tool 300 can be increased.

最後に、第２実施形態と同様に径方向外側に突出したバリＣを切削加工で除去して切削工具３００が形成される。 Finally, as in the second embodiment, the burr C protruding outward in the radial direction is removed by cutting to form the cutting tool 300.

以上、上記各実施形態に基づき本発明を説明したが、本発明は上記各実施形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の変形改良が可能であることは、容易に推察できるものである。 Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications and improvements can be made without departing from the spirit of the present invention. Can be easily guessed.

上記各実施形態において、一の実施形態における構成の一部または全部を、他の実施形態における構成の一部または全部の構成を組み合わせて或いは置き換えて、別の実施形態としても良い。 In each of the above-described embodiments, a part or all of the configuration in one embodiment may be combined with or replaced with a part or all of the configuration in the other embodiments to form another embodiment.

上記各実施形態では、第１部材１０，２１０，３１０が高速度鋼で形成され、第２部材２０，２２０が鋼材で形成される場合を説明したが、必ずしもこれに限られるものではない。例えば、第１部材１０，２１０，３１０が超硬合金で形成されるものであっても良い。 In each of the above embodiments, the case where the first members 10, 210, and 310 are formed of high-speed steel and the second members 20 and 220 are formed of a steel material has been described. However, the present invention is not necessarily limited thereto. For example, the first member 10, 210, 310 may be formed of a cemented carbide.

上記各実施形態では、溝部１３，２１３の幅寸法（図２（ａ）及び図４（ａ）左右方向）が一側から他側に亘って一定に形成される場合を説明したが、必ずしもこれに限られるものではない。例えば、溝部１３，２１３は、軸中心で幅寸法が第２中空孔２２の直径と略同一となるように一側および他側から軸中心に向かって幅寸法が大きく形成されても良い。これにより、オイルホールを切削液が流れる場合に第２中空孔２２と溝部１３，２３３との流動をスムーズにすることができる。 In each of the above embodiments, the case has been described in which the width dimensions of the grooves 13 and 213 (FIG. 2 (a) and FIG. 4 (a) in the left-right direction) are formed uniformly from one side to the other. It is not limited to. For example, the groove portions 13 and 213 may be formed to have a larger width dimension from one side and the other side toward the axis center so that the width dimension is substantially the same as the diameter of the second hollow hole 22 at the axis center. Thereby, when a cutting fluid flows through an oil hole, the flow of the second hollow hole 22 and the grooves 13 and 233 can be made smooth.

上記各実施形態では、溝部１３，２１３が第１中空孔１２を連結する方向（図２（ａ）及び図４（ａ）左右方向）に直線上に形成される場合を説明したが、必ずしもこれに限られるものではない。例えば、溝部１３，２１３は、一側から他側に亘って波形状に曲がって形成されても良い。 In each of the above embodiments, the case where the grooves 13 and 213 are formed in a straight line in the direction (FIG. 2A and FIG. 4A in the left-right direction) connecting the first hollow holes 12 has been described. It is not limited to. For example, the grooves 13 and 213 may be formed in a wave shape from one side to the other side.

上記第３実施形態では、第３突部３１６が第１突部２１５の外縁を削り取って形成され、バリＦ及びバリＧが径方向外側に突出することを抑制する場合を説明したが、必ずしもこれに限られるものではない。例えば、第２突部２２３の径方向内側を軸方向に削り取って、第２突部２２３の径方向外側に突出した突出部分を形成しても良い。これにより、第２突部２２３の端面と外縁凹部２１４の端面との圧接によって径方向内側に突出するバリを抑制することができる。 In the third embodiment, the case where the third protrusion 316 is formed by scraping the outer edge of the first protrusion 215 and the burr F and the burr G are prevented from protruding outward in the radial direction has been described. It is not limited to. For example, the radially inner side of the second protrusion 223 may be scraped in the axial direction to form a protruding portion that protrudes radially outward of the second protrusion 223. Thereby, the burr | flash which protrudes to radial inside by the press-contact of the end surface of the 2nd protrusion 223 and the end surface of the outer edge recessed part 214 can be suppressed.

１００，２００，３００切削工具
１０，２１０，３１０第１部材
１１切れ刃
１２第１中空孔
１３，２１３溝部
２１４外縁凹部
２１５第１突部
３１６第３突部
２０，２２０第２部材
２１シャンク部
２２第２中空孔
２２３第２突部

100, 200, 300 Cutting tool 10, 210, 310 First member 11 Cutting edge 12 First hollow hole 13, 213 Groove 214 Outer edge recess 215 First protrusion 316 Third protrusion 20, 220 Second member 21 Shank 22 Second hollow hole 223 Second protrusion

Claims

In the cutting tool provided with the 1st member which has a cutting edge, and the 2nd member which has a shank part,
The first member includes two first hollow holes penetrating from one side in the axial direction to the other side, a groove recessed in the axial direction on the end surface on the one side, and an axial direction from an outer edge of the end surface on the one side. And a first protrusion protruding in the axial direction at the radial center of the outer edge recess ,
The second member includes a second hollow hole penetrating from one side in the axial direction to the other side in the axial center, and a second protrusion protruding in the axial direction from the outer edge of the joint surface with the first member. ,
The groove portion is formed to connect the two first hollow holes and intersect the axis,
The outer diameter of the first protrusion is set smaller than the inner diameter of the second protrusion, and the axial distance dimension of the first protrusion and the axial distance dimension of the second protrusion are substantially the same. Formed identically
When the first member and the second member are relatively rotated about the axis and are pressed in the axial direction, one side of the first member and the second member is brought into contact with each other to be joined, and the first hollow A cutting tool, wherein the hole and the second hollow hole are communicated with each other through the groove, and an oil hole is formed which communicates from one side in the axial direction of the cutting tool to the other side.

It said first projection and said second projection are cutting tool請claim 1, wherein a is formed in a circular shape around the axis.

The first protrusion has a third protrusion protruding in a step shape by scraping the radially outer side of the end face in the axial direction,
The third protrusion is formed such that an axial dimension thereof is smaller than a distance dimension for press-contacting the first member and the second member, and an outer diameter is smaller than that of the first protrusion. The cutting tool according to claim 1 or 2 .

The groove cutting tool according to any of claims 1 to 3, characterized in that connecting opposite ends of said two first hollow hole is opened on the outer peripheral surface of said first projection.