JP2022070394A

JP2022070394A - Cutting tool

Info

Publication number: JP2022070394A
Application number: JP2020179436A
Authority: JP
Inventors: 貴行名取; Takayuki Natori; 健治川井; Kenji Kawai; 仁史四津谷; Hitoshi Yotsuya
Original assignee: Toyota Motor Corp; Fuji Bellows Co Ltd; Fuji Seiko Ltd
Current assignee: Toyota Motor Corp; Fuji Bellows Co Ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2022-05-13

Abstract

To provide a cutting tool that can be suppressed from being deteriorated in rigidity.SOLUTION: A cutting tool 100 comprises: a tool main body 1; cutting parts 2 formed on an outer periphery of the tool main body; trunk paths 10 and 20, extended along an axial direction of the tool main body, through which a coolant is flown into the tool main body; and a plurality of branch paths 11 and 21 through which a plurality of openings 12 and 22 formed on surfaces of the cutting parts are communicated with the trunk paths respectively and coolants are supplied from the trunk paths to the plurality of openings. A plurality of intersection points 13 and 23 between the plurality of branch paths and the trunk paths are provided at position different from each other in the axial direction, and a plurality of angles α and β formed by the plurality of branch paths and the trunk paths are different from each other.SELECTED DRAWING: Figure 3

Description

本発明は、切削工具に関する。 The present invention relates to a cutting tool.

従来より、工具内部に切削液が流通するための管を備え、刃先に切削液を供給できる穴を複数備え、工具内部では管が分岐している切削工具が知られている（例えば、特許文献１、２）。 Conventionally, a cutting tool having a pipe for circulating cutting fluid inside the tool, having a plurality of holes for supplying cutting fluid to the cutting edge, and branching the pipe inside the tool has been known (for example, patent documents). 1, 2).

特開２０１５－１８８９５１号公報JP-A-2015-188951 特開２０１９－１２３０７２号公報Japanese Unexamined Patent Publication No. 2019-123072

ところで、工具内部で管が分岐している切削工具では、複数の分岐の位置が近い場所に集中していると、その箇所の肉厚が薄くなって、工具の剛性が低下するおそれがあり、工具が折損してしまう場合がある。 By the way, in a cutting tool in which a pipe is branched inside the tool, if the positions of a plurality of branches are concentrated in close places, the wall thickness at that place may become thin and the rigidity of the tool may decrease. The tool may break.

本発明は、上記課題に鑑みなされたものであり、剛性の低下を抑制することが可能な切削工具を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a cutting tool capable of suppressing a decrease in rigidity.

上記目的を達成するため、明細書に開示された切削工具は、本体と、前記本体の外周に形成された刃部と、前記本体の内部にクーラントを流通させ、前記本体の軸方向に沿って延びる幹路と、前記刃部の表面に形成された複数の開口を前記幹路にそれぞれ連通させ、前記クーラントを前記幹路から前記複数の開口に供給する複数の枝路とを備え、前記複数の枝路と前記幹路との複数の交点は、前記軸方向において互いに異なる位置に設けられ、かつ、前記複数の枝路と前記幹路とのなす複数の角度は、互いに異なることを特徴とする。 In order to achieve the above object, the cutting tool disclosed in the specification circulates a main body, a blade portion formed on the outer periphery of the main body, and a coolant inside the main body, and along the axial direction of the main body. A plurality of branch paths are provided, wherein an extending trunk path and a plurality of openings formed on the surface of the blade portion are communicated with the trunk path, and the coolant is supplied from the trunk path to the plurality of openings. The plurality of intersections of the branch road and the trunk road are provided at different positions in the axial direction, and the plurality of angles formed by the plurality of branch roads and the trunk road are different from each other. do.

本明細書の切削工具によれば、剛性の低下を抑制することができる。 According to the cutting tool of the present specification, it is possible to suppress a decrease in rigidity.

図１（Ａ）は、本実施の形態に係る切削工具の斜視図であり、図１（Ｂ）は、切削工具の側面図である。1 (A) is a perspective view of a cutting tool according to the present embodiment, and FIG. 1 (B) is a side view of the cutting tool. 図２は、切削工具の正面図である。FIG. 2 is a front view of the cutting tool. 図３は、図２のＡ－Ａ線に沿った切削工具の断面図である。FIG. 3 is a cross-sectional view of the cutting tool along the line AA of FIG.

以下、図面を参照しながら本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

本実施の形態に係る切削工具１００は、例えば、金属材料等からなる被削材の切削加工に使用される段付きのドリルである。なお、切削工具１００は、直刃のドリル又はストレート状のタップ（穴開け工具）などでもよい。 The cutting tool 100 according to the present embodiment is, for example, a stepped drill used for cutting a work material made of a metal material or the like. The cutting tool 100 may be a straight-edged drill or a straight tap (drilling tool).

図１（Ａ）の切削工具１００は、略円柱状の工具本体１と、工具本体１の外周に形成された刃部２と、工具本体１の外周に形成された溝部５とを有する。略円柱状の工具本体１から溝部５に相当する大きさの工具本体１の一部を除去することにより、工具本体１の残った部分が刃部２に対応する。刃部２は、直径の小さな第１刃部２ａと、第１刃部２ａよりも大きな直径の第２刃部２ｂとを備えている。第１刃部２ａは第２刃部２ｂよりも先端側に設けられている。このように、段付きのドリルでは、刃部２が２段の刃部２ａ，２ｂで構成されている。 The cutting tool 100 of FIG. 1A has a substantially columnar tool body 1, a blade portion 2 formed on the outer periphery of the tool body 1, and a groove portion 5 formed on the outer periphery of the tool body 1. By removing a part of the tool body 1 having a size corresponding to the groove 5 from the substantially columnar tool body 1, the remaining part of the tool body 1 corresponds to the blade part 2. The blade portion 2 includes a first blade portion 2a having a small diameter and a second blade portion 2b having a diameter larger than that of the first blade portion 2a. The first blade portion 2a is provided on the tip end side of the second blade portion 2b. As described above, in the stepped drill, the blade portion 2 is composed of the two-step blade portions 2a and 2b.

工具本体１の先端部３（図１（Ｂ）の左側）に刃部２が形成されている。工具本体１の基端部４（図１（Ｂ）の右側）が不図示の工作機械等に把持される。工作機械が工具本体１を軸線Ｏ回りの回転方向Ｔに回転させることで、被削材の切削加工が実行される。本実施の形態では、工具本体１の軸線Ｏに沿った方向を軸方向といい、軸線Ｏに直交する方向を径方向という。 The blade portion 2 is formed on the tip portion 3 (left side of FIG. 1B) of the tool body 1. The base end portion 4 (right side of FIG. 1B) of the tool body 1 is gripped by a machine tool or the like (not shown). When the machine tool rotates the tool body 1 in the rotation direction T around the axis O, cutting of the work material is executed. In the present embodiment, the direction along the axis O of the tool body 1 is referred to as an axial direction, and the direction orthogonal to the axis O is referred to as a radial direction.

図２に示すように、工具本体１の先端側から見ると、略十字状に刃部２が形成され、隣接する刃部２同士の間に溝部５が形成されている。 As shown in FIG. 2, when viewed from the tip end side of the tool body 1, the blade portions 2 are formed in a substantially cross shape, and the groove portions 5 are formed between the adjacent blade portions 2.

図２及び図３に示すように、刃部２の内部には、工具本体１の内部にクーラント（切削液）を流通させ、工具本体１の軸方向に沿って延びる幹路１０、２０が形成されている。図２に示すように、幹路１０、２０が刃部２の先端面に開口している。なお、工具本体１及び刃部２の内部に形成される幹路の個数は２つに限定されるものではなく、１つ以上でもよい。 As shown in FIGS. 2 and 3, inside the blade portion 2, coolant (cutting fluid) is circulated inside the tool body 1 to form trunk paths 10 and 20 extending along the axial direction of the tool body 1. Has been done. As shown in FIG. 2, the trunk paths 10 and 20 are open to the tip surface of the blade portion 2. The number of trunk paths formed inside the tool body 1 and the blade portion 2 is not limited to two, and may be one or more.

図１（Ａ）及び図３に示すように、刃部２（第２刃部２ｂ）の表面には、クーラントを刃部２の表面に供給するための開口１２が形成されている。さらに、刃部２（第２刃部２ｂ）の内部には、開口１２と幹路１０とを連通する枝路１１が形成されている。枝路１１は、幹路１０の先端側に向かうに従い径方向の外側、つまり、径が広がる方向へ向かって延びており、軸線Ｏに対して傾斜させられている。 As shown in FIGS. 1A and 3, an opening 12 for supplying coolant to the surface of the blade portion 2 is formed on the surface of the blade portion 2 (second blade portion 2b). Further, inside the blade portion 2 (second blade portion 2b), a branch path 11 that connects the opening 12 and the trunk path 10 is formed. The branch road 11 extends outward in the radial direction toward the tip end side of the trunk road 10, that is, toward the direction in which the diameter increases, and is inclined with respect to the axis O.

同様に、刃部２の表面には、クーラントを刃部２（第２刃部２ｂ）の表面に供給するための開口２２が形成されている。さらに、刃部２（第２刃部２ｂ）の内部には、開口２２と幹路２０とを連通する枝路２１が形成されている。枝路２１は、幹路２０の先端側に向かうに従い径方向の外側、つまり、径が広がる方向へ向かって延びており、軸線Ｏに対して傾斜させられている。本実施の形態では、工具本体１及び刃部２の内部に形成される枝路の個数は２つ以上であればよい。 Similarly, an opening 22 for supplying the coolant to the surface of the blade portion 2 (second blade portion 2b) is formed on the surface of the blade portion 2. Further, inside the blade portion 2 (second blade portion 2b), a branch path 21 that connects the opening 22 and the trunk path 20 is formed. The branch road 21 extends radially outward toward the tip end side of the trunk road 20, that is, toward a direction in which the diameter increases, and is inclined with respect to the axis O. In the present embodiment, the number of branch paths formed inside the tool body 1 and the blade portion 2 may be two or more.

幹路１０の内径に対して枝路１１の内径は、同等以下である。また、幹路２０の内径に対して枝路２１の内径は、同等以下である。なお、幹路１０の内径と幹路２０の内径とは同等であるが、異ならせてもよい。例えば、幹路１０の内径を幹路２０の内径よりも大きくしてもよいし、幹路２０の内径を幹路１０の内径よりも大きくしてもよい。枝路１１の内径と枝路２１の内径も同等であるが、異ならせてもよい。例えば、枝路１１の内径を枝路２１の内径よりも大きくしてもよいし、枝路２１の内径を枝路１１の内径よりも大きくしてもよい。 The inner diameter of the branch road 11 is equal to or less than the inner diameter of the main road 10. Further, the inner diameter of the branch road 21 is equal to or less than the inner diameter of the main road 20. The inner diameter of the trunk road 10 and the inner diameter of the trunk road 20 are the same, but may be different. For example, the inner diameter of the trunk road 10 may be larger than the inner diameter of the trunk road 20, or the inner diameter of the trunk road 20 may be larger than the inner diameter of the trunk road 10. The inner diameter of the branch road 11 and the inner diameter of the branch road 21 are the same, but may be different. For example, the inner diameter of the branch road 11 may be larger than the inner diameter of the branch road 21, or the inner diameter of the branch road 21 may be larger than the inner diameter of the branch road 11.

切削加工時には、幹路１０，２０、枝路１１，２１及び開口１２，２２を通して工具本体１の刃部２の表面にクーラントが供給される。本実施の形態では、刃部２の先端部及び開口１２，２２からクーラントを噴出させることで、刃部２の潤滑や冷却、並びに溝部５に付着した切屑の排出を促すように構成されている。 During cutting, coolant is supplied to the surface of the blade portion 2 of the tool body 1 through the trunk paths 10, 20, branch paths 11, 21 and openings 12, 22. In the present embodiment, the coolant is ejected from the tip portion of the blade portion 2 and the openings 12 and 22 to promote lubrication and cooling of the blade portion 2 and discharge of chips adhering to the groove portion 5. ..

図３に示すように、枝路１１と幹路１０との交点１３と、枝路２１と幹路２０との交点２３とは、軸方向において互いに異なる位置に設けられている。図３では、交点２３が交点１３よりも先端側に設けられている。図３の交点１３、２３の位置関係とは逆に、交点１３が交点２３よりも先端側に設けられていてもよい。剛性の低い部分ができないようにするため、枝路１１と枝路２１とは、軸線Ｏに直交する方向で重ならないのが好ましい。 As shown in FIG. 3, the intersection 13 between the branch road 11 and the main road 10 and the intersection 23 between the branch road 21 and the main road 20 are provided at different positions in the axial direction. In FIG. 3, the intersection 23 is provided on the tip side of the intersection 13. Contrary to the positional relationship between the intersections 13 and 23 in FIG. 3, the intersection 13 may be provided on the tip side of the intersection 23. It is preferable that the branch road 11 and the branch road 21 do not overlap in the direction orthogonal to the axis O so that a portion having low rigidity is not formed.

さらに、図３に示すように、枝路１１と幹路１０とのなす角度αと、枝路２１と幹路２０とのなす角度βとは互いに異なる。図３では、角度αが角度βよりも小さいが、角度αが角度βよりも大きくてもよい。交点１３及び交点２３を軸方向において互いに異なる位置に設けるだけでなく、枝路と幹路と間の角度を変えることで、肉厚が薄い部分を分散させ、曲げやねじりなどの外力に対する変形をより減らすことができ、剛性の低下をより抑制することができる。 Further, as shown in FIG. 3, the angle α formed by the branch road 11 and the main road 10 and the angle β formed by the branch road 21 and the main road 20 are different from each other. In FIG. 3, the angle α is smaller than the angle β, but the angle α may be larger than the angle β. Not only are the intersections 13 and 23 provided at different positions in the axial direction, but by changing the angle between the branch road and the trunk road, the thin part is dispersed and deformation due to external force such as bending and twisting is caused. It can be further reduced, and the decrease in rigidity can be further suppressed.

本実施の形態によれば、枝路１１と幹路１０との交点１３と、枝路２１と幹路２０との交点２３とを軸方向において互いに異なる位置に設け、かつ、枝路１１と幹路１０とのなす角度αと、枝路２１と幹路２０とのなす角度βとを互いに異ならせているので、工具本体１又は刃部２において、肉薄で剛性の低い部分ができてしまうことが抑制され、工具本体１の折損のリスクを抑制することができる。 According to the present embodiment, the intersection 13 between the branch road 11 and the trunk road 10 and the intersection 23 between the branch road 21 and the trunk road 20 are provided at different positions in the axial direction, and the branch road 11 and the trunk road 11 and the trunk road 20 are provided at different positions. Since the angle α formed by the road 10 and the angle β formed by the branch road 21 and the trunk road 20 are different from each other, a thin and low-rigidity portion is formed in the tool body 1 or the blade portion 2. Can be suppressed, and the risk of breakage of the tool body 1 can be suppressed.

つまり、枝路と幹路との複数の交点が軸方向において１か所又はほとんど離れていない複数箇所に集中することを避け且つ複数の枝路の形成角度を互いに異ならせることで、枝路周辺の工具本体１の剛性の低下を抑制することができる。 That is, by avoiding that a plurality of intersections of a branch road and a trunk road are concentrated in one place or a plurality of places that are hardly separated in the axial direction and by making the formation angles of the plurality of branch roads different from each other, the periphery of the branch road. It is possible to suppress a decrease in the rigidity of the tool body 1 of the above.

以上、本発明の好ましい実施形態について詳述したが、本発明は係る特定の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。 Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiment, and various modifications are made within the scope of the gist of the present invention described in the claims.・ Can be changed.

１工具本体、２刃部、３先端部、４基端部、５溝部、１０，２０幹路、１１，２１枝路、１２，２２開口、１３，２３交点、α，β 角度、１００切削工具

1 Tool body, 2 blades, 3 tips, 4 base ends, 5 grooves, 10,20 trunks, 11,21 branches, 12,22 openings, 13,23 intersections, α, β angles, 100 cutting tools

Claims

With the main body
The blade formed on the outer circumference of the main body and
A trunk path that circulates coolant inside the main body and extends along the axial direction of the main body.
A plurality of branches formed on the surface of the blade portion are communicated with the trunk path, and the coolant is supplied from the trunk path to the plurality of openings.
The plurality of intersections of the plurality of branch roads and the trunk road are provided at different positions in the axial direction, and the plurality of angles formed by the plurality of branch roads and the trunk road are different from each other. A characteristic cutting tool.