JP2013103312A - Tool for sucking chip - Google Patents

Tool for sucking chip Download PDF

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JP2013103312A
JP2013103312A JP2011249830A JP2011249830A JP2013103312A JP 2013103312 A JP2013103312 A JP 2013103312A JP 2011249830 A JP2011249830 A JP 2011249830A JP 2011249830 A JP2011249830 A JP 2011249830A JP 2013103312 A JP2013103312 A JP 2013103312A
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tool
stepped
tip
chip suction
chip
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JP5777028B2 (en
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Morihiro Hideta
守弘 秀田
Yasuji Sato
康児 佐藤
Hideo Mori
英夫 森
Suehiro Ikeda
末広 池田
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DMG Mori Co Ltd
Sumitomo Electric Hardmetal Corp
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Sumitomo Electric Hardmetal Corp
Mori Seiki Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a tool for sucking chips capable of improving the partibility of chips by a simple structure and improving the recovery efficiency of the chips.SOLUTION: A cutting blade 9 formed at a tip 8a includes a plurality of stepped blades 9b formed with stepwise steps 9a from a tool axial center a toward the outside of the radial direction. Each of the stepped blades 9b is formed to form a tapered surface which becomes closer to the tool axial center a as the stepped blade is away from a tool tip a'.

Description

本発明は、切屑吸引装置を備えた工作機械に装着される切屑吸引用工具に関し、特に、切削加工時に発生する切屑の回収効率を向上できるようにした吸引構造の改善に関する。   The present invention relates to a chip suction tool mounted on a machine tool equipped with a chip suction device, and more particularly to improvement of a suction structure that can improve the efficiency of collecting chips generated during cutting.

工作機械において、ワーク加工中に発生する切屑の飛散を防止するために切屑吸引装置を備える場合がある。この種の工作機械において、切屑の回収効率を向上するには、発生する切屑をできるだけ小さく分断することが効果的である。   In a machine tool, a chip suction device may be provided in order to prevent scattering of chips generated during workpiece processing. In this type of machine tool, it is effective to divide the generated chips as small as possible in order to improve the chip recovery efficiency.

このように切屑を小さく分断することを狙ったドリルとして、従来例えば、特許文献１に記載されたものがある。このドリルでは、先端部に形成された切刃を、径方向外方に向かって階段状に複数の段差部を形成した段付き刃としており、この段付き刃によって切屑を小さく破砕することができる。   Conventionally, for example, there is a drill described in Patent Document 1 as a drill aiming at dividing chips into small pieces. In this drill, the cutting blade formed at the tip is a stepped blade in which a plurality of stepped portions are formed stepwise toward the outside in the radial direction, and chips can be crushed small by this stepped blade. .

特許第４１３２４７７号公報Japanese Patent No. 4132477

ところで、前記公報記載の工具では、切刃が複数の段付き刃によって構成されているので、切刃が径方向外方に連続している従来の工具に比較すれば、切屑分断性の向上が期待される。しかし、前記公報記載の工具では、前記段差部の形状の如何によっては、切屑の分断が期待通りにいかず、切屑の回収効率を向上できない場合があることが判明した。   By the way, in the tool described in the above publication, since the cutting edge is composed of a plurality of stepped blades, the chip cutting performance is improved as compared with a conventional tool in which the cutting edge is continuous radially outward. Be expected. However, in the tool described in the above publication, it has been found that, depending on the shape of the stepped portion, the cutting of the chips does not work as expected, and the chip recovery efficiency may not be improved.

本発明は、前記従来の状況に鑑みてなされたもので、簡単な構造により切屑の分断性を向上でき、切屑の回収効率を向上できる切屑吸引用工具を提供することを課題としている。   The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide a chip suction tool that can improve the chip breaking property with a simple structure and can improve the chip collection efficiency.

請求項１の発明は、先端部に切刃が形成されるとともに、先端部に開口する切屑吸引孔を有し、切屑吸引装置を備えた工作機械に装着される切屑吸引用工具であって、前記切刃は、工具軸心から径方向外方に向かって階段状に段差部が形成された複数の段付き刃で構成され、前記各段差部は、前記工具軸心と平行に形成され、又は工具先端から遠ざかるほど工具軸心に近くなるテーパ面をなすように形成されていることを特徴としている。   The invention of claim 1 is a chip suction tool to be mounted on a machine tool having a chip suction hole having a chip suction hole opened at the front end part and having a chip suction hole opened at the tip part, The cutting edge is composed of a plurality of stepped blades having stepped portions formed stepwise from the tool axis toward the outside in the radial direction, and each stepped portion is formed in parallel with the tool axis, Alternatively, the taper surface is formed so as to be closer to the tool axis as the distance from the tool tip increases.

請求項２の発明は、請求項１に記載の切屑吸引用工具において、前記各段差部は、前記テーパ面をなしており、該各段差部の工具先端から遠い側の端部と隣接する段付き刃とがなす隅部は、弧状をなしており、かつ前記段差部の工具軸心方向の投影面内に位置する大きさに設定されていることを特徴としている。   According to a second aspect of the present invention, in the chip suction tool according to the first aspect, each stepped portion forms the tapered surface, and the step adjacent to the end of the stepped portion far from the tool tip. The corner formed by the blade is arcuate and is set to a size that is located within the projection plane of the stepped portion in the tool axis direction.

請求項３の発明は、請求項１又２に記載の切屑吸引用工具において、前記切刃のすくい面に溝部が形成され、該溝部は、前記段付き刃との境界面が前記工具軸心に対して工具先端側ほど回転方向前側に位置するよう傾斜するねじれ角を有し、該ねじれ角は、０°又は０°〜２０°に設定されていることを特徴としている。   According to a third aspect of the present invention, in the chip suction tool according to the first or second aspect, a groove is formed in the rake face of the cutting edge, and the boundary surface of the groove with the stepped blade is the tool axis. With respect to the tool tip side, it has a twist angle that is inclined so as to be located on the front side in the rotation direction, and the twist angle is set to 0 ° or 0 ° to 20 °.

請求項１の発明によれば、段付き刃を構成する段差部を、前記工具軸心と平行に、又は工具先端から遠ざかるほど工具軸心に近くなるテーパ面をなすように形成したので、切屑の分断性を向上でき、切屑の回収効率を向上できる。即ち、前記公報記載の工具の場合、前記段差部が工具先端から遠ざかるほど工具軸心から遠くなるテーパ面、つまり先細りのテーパ面をなすように形成されているので、各段付き刃によって切削が行われるとともに、前記先細りのテーパ面によっても切削が行われる場合があり、その結果各段付き刃による切屑同士がテーパ面による切屑を介して繋がってしまう場合があった。   According to the first aspect of the present invention, the stepped portion constituting the stepped blade is formed in parallel with the tool axis or so as to form a tapered surface that becomes closer to the tool axis as the distance from the tool tip increases. Can be improved, and chip collection efficiency can be improved. That is, in the case of the tool described in the above publication, the stepped portion is formed so as to form a tapered surface that becomes farther from the tool axis as the distance from the tool tip, that is, a tapered surface that is tapered. In addition, cutting may be performed by the tapered surface of the taper, and as a result, chips by the stepped blades may be connected to each other through chips by the tapered surface.

これに対して、本発明では、段差部を、前記工具軸心と平行に、又は工具先端から遠ざかるほど工具軸心に近くなるテーパ面、つまり従来と逆の先拡がりのテーパ面としたので、段差部のテーパ面による切削が行われることはほとんどなく、各段付き刃による切屑同士を確実に分断できる。   On the other hand, in the present invention, the stepped portion is a taper surface that is parallel to the tool axis or closer to the tool axis as it is farther from the tool tip, that is, a taper surface that is widened opposite to the conventional one, Cutting with the tapered surface of the stepped portion is rarely performed, and chips from each stepped blade can be reliably separated.

請求項２の発明によれば、各段差部と隣接する段付き刃とがなす隅部を段差部の工具軸心方向の投影面内に位置する大きさに設定したので、より確実に切屑の分断性を向上でき、切屑の回収効率を向上できる。即ち、切刃を、階段状に段差部が形成された複数の段付き刃で構成した場合、段差部と隣接する段付き刃との隅部は、その製造工程上研削砥石の形状に対応した弧状となる。そのため前記隅部の大きさ如何によっては、特に弧状部分においても切削が行われ、前記分断性に悪影響を与えるおそれがある。これに対して、本発明では、前記テーパ面を、前記隅部が、前記段差部の軸心方向投影面内に位置する程度の先拡がりの逆テーパ面としたので、前記隅部による悪影響を回避でき、切屑の分断性をより一層向上できる。   According to the second aspect of the present invention, since the corner portion formed by each stepped portion and the adjacent stepped blade is set to a size that is located in the projection plane in the tool axis direction of the stepped portion, it is possible to more reliably remove chips. Dividing property can be improved, and chip recovery efficiency can be improved. That is, when the cutting edge is composed of a plurality of stepped blades having stepped portions formed in a stepped shape, the corners of the stepped blades and the adjacent stepped blades correspond to the shape of the grinding wheel in the manufacturing process. Arc shape. Therefore, depending on the size of the corner, cutting is performed particularly in the arc-shaped portion, which may adversely affect the severability. On the other hand, in the present invention, the tapered surface is an inversely tapered surface that is widened to such an extent that the corner portion is located in the axial projection surface of the stepped portion. This can be avoided, and the chip breaking property can be further improved.

請求項３の発明によれば、各切刃のすくい面に形成された溝部に、工具軸心に平行または０°〜２０°傾斜するねじれ角を設定したので、より確実に切屑を小さくすることができる。切屑を小さくすることで、個々の切屑が軽くなるため、切屑の回収効率を向上できる。   According to the invention of claim 3, since the torsion angle that is parallel to the tool axis or inclined by 0 ° to 20 ° is set in the groove portion formed on the rake face of each cutting edge, the chips can be reduced more reliably. Can do. By making the chips smaller, the individual chips become lighter, so that the chip collection efficiency can be improved.

本発明の実施例１に係る切屑吸引用工具が装着された工作機械の全体斜視図である。1 is an overall perspective view of a machine tool equipped with a chip suction tool according to Embodiment 1 of the present invention. 前記工具の正面図である。It is a front view of the tool. 前記工具の切刃部分の、前記図２におけるIII矢視図である。It is the III arrow directional view in the said FIG. 2 of the cutting blade part of the said tool. 前記工具の切刃部分の、前記図２におけるIV矢視図である。It is the IV arrow line view in the said FIG. 2 of the cutting blade part of the said tool. 前記工具の段差部の拡大図である。It is an enlarged view of the level | step-difference part of the said tool. 前記工具の右側面図である。It is a right view of the said tool. 前記工具を用いて発生した切屑の拡大図である。It is an enlarged view of the chip | tip generated using the said tool.

以下、本発明の実施の形態を添付図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１ないし図６は、本発明の実施例１による切屑吸引用工具を説明するための図である。   1 to 6 are views for explaining a chip suction tool according to a first embodiment of the present invention.

図において、１は工作機械を示している。該工作機械１は、ベッド２と、該ベッド２の奥部分に立設されたコラム３と、該コラム３の前面に上下方向（Ｚ軸方向）に移動自在に支持された主軸頭４と、前記ベッド２の手前部分に前後方向（Ｙ軸方向）に移動自在に支持されたサドル５と、該サドル５上に左右方向（Ｘ軸方向）に移動自在に支持されたテーブル６とを備えている。   In the figure, reference numeral 1 denotes a machine tool. The machine tool 1 includes a bed 2, a column 3 standing on the back of the bed 2, a spindle head 4 supported on the front surface of the column 3 so as to be movable in the vertical direction (Z-axis direction), A saddle 5 is supported on the front portion of the bed 2 so as to be movable in the front-rear direction (Y-axis direction), and a table 6 is supported on the saddle 5 so as to be movable in the left-right direction (X-axis direction). Yes.

前記主軸頭４内には、主軸７が回転自在に支持されており、該主軸７の下端部には工具ホルダ１４を介して切屑吸引用工具としてのドリル１０が着脱可能に装着されている。   A spindle 7 is rotatably supported in the spindle head 4, and a drill 10 as a chip suction tool is detachably attached to a lower end portion of the spindle 7 via a tool holder 14.

前記工作機械１は、さらに、前記主軸７に装着された前記ドリル１０と次工程用工具とを自動的に交換する自動工具交換装置１１を備えている。この自動工具交換装置１１は、前記コラム３の側壁に配置された工具マガジン１２と、該工具マガジン１２と前記主軸７との間に配置された工具交換アーム１３とを有する。   The machine tool 1 further includes an automatic tool changer 11 that automatically exchanges the drill 10 mounted on the spindle 7 and the next process tool. The automatic tool changer 11 includes a tool magazine 12 arranged on the side wall of the column 3 and a tool change arm 13 arranged between the tool magazine 12 and the main shaft 7.

そして本実施例の工作機械１は、前記主軸７に装着された前記ドリル１０によりワークＷに穴あけ加工を施す際に発生する切屑を吸引する切屑吸引装置１５を備えている。   The machine tool 1 according to the present embodiment includes a chip suction device 15 that sucks chips generated when the work W is drilled by the drill 10 attached to the main shaft 7.

前記切屑吸引装置１５は、吸引力発生源を内蔵する切屑回収箱１５ｂと前記ドリル１０とを、該ドリル１０，前記工具ホルダ１４及び主軸７に形成された吸引路及び吸引パイプ１５ａにより接続した概略構造を有する。   The chip suction device 15 is an outline in which a chip collection box 15b containing a suction force generation source and the drill 10 are connected by a suction path and a suction pipe 15a formed in the drill 10, the tool holder 14, and the main shaft 7. It has a structure.

前記主軸７は、軸心部に、前記吸引路の一部を構成する切屑排出孔が貫通形成された筒状体からなり、前記主軸頭４に内蔵された駆動モータ（不図示）により回転駆動される。   The main shaft 7 is formed of a cylindrical body in which a chip discharge hole that constitutes a part of the suction path is formed in the shaft center portion, and is driven to rotate by a drive motor (not shown) built in the main shaft head 4. Is done.

前記工具ホルダ１４は、軸心部に、前記工具１０が装着される支持穴及び前記吸引路の一部を構成する切屑排出孔が貫通形成され、前記主軸７の下端部に着脱可能に装着されている。   In the tool holder 14, a support hole in which the tool 10 is mounted and a chip discharge hole that constitutes a part of the suction path are formed through the shaft center portion, and the tool holder 14 is detachably mounted on the lower end portion of the main shaft 7. ing.

前記ドリル１０は、ドリル本体８と、該ドリル本体８の先端部８ａの先端面に形成された一対の切刃９，９とを有する。前記ドリル本体８は、前記切刃９が形成された前記先端部８ａと、該先端部８ａより小径の胴部８ｂと、該胴部８ｂより大径で前記工具ホルダ１４に保持される保持部８ｃとを有し、切屑吸引孔１６が、軸心ａを貫通して延びる円筒状をなしている。   The drill 10 includes a drill body 8 and a pair of cutting blades 9 and 9 formed on the distal end surface of the distal end portion 8 a of the drill body 8. The drill body 8 includes the tip portion 8a on which the cutting edge 9 is formed, a barrel portion 8b having a smaller diameter than the tip portion 8a, and a holding portion having a diameter larger than that of the barrel portion 8b and held by the tool holder 14. The chip suction hole 16 has a cylindrical shape extending through the axis a.

前記一対の切刃９，９は、前記工具軸心ａを中心とする点対称をなすように配置形成されている。そして、前記先端部８ａの、図２における前記切刃９，９より反時計回りの回転方向前側部分はすくい面を構成するのであるが、本実施例１では、この前側部分を切削除去することにより溝部８ｆ，８ｆが形成されている。この溝部８ｆ，８ｆを形成したことにより、前記切屑吸引孔１６の吸込口１６ａ，１６ａが切刃９，９の前記回転方向前側近傍に開口している。また、前記切屑吸引孔１６の後端部は前記ドリル本体８の後端面８ｅに開口している。   The pair of cutting blades 9 and 9 are arranged and formed so as to be point-symmetric about the tool axis a. The front portion of the tip portion 8a in the counterclockwise rotation direction from the cutting blades 9 and 9 in FIG. 2 constitutes a rake face. In the first embodiment, the front portion is removed by cutting. Thus, groove portions 8f and 8f are formed. By forming the groove portions 8f and 8f, the suction ports 16a and 16a of the chip suction hole 16 are opened in the vicinity of the front side of the cutting blades 9 and 9 in the rotation direction. Further, the rear end portion of the chip suction hole 16 is open to the rear end surface 8 e of the drill body 8.

そして前記各切刃９は、工具軸心ａから径方向外方に向かって階段状に段差部９ａを形成してなる複数（本実施例では４個）の段付き刃９ｂで構成されている。前記各段付き刃９ｂは、所定の、例えば１３０°〜１４０°の刃先角度となるように工具軸心ａ上の工具先端ａ′から径方向外方ほど低くなるように形成されている。   Each of the cutting blades 9 is composed of a plurality of (four in this embodiment) stepped blades 9b each formed with a stepped portion 9a stepwise from the tool axis a toward the radially outer side. . Each of the stepped blades 9b is formed so as to become lower in the radial direction from the tool tip a 'on the tool axis a so as to have a predetermined edge angle of, for example, 130 ° to 140 °.

さらに、前記各切刃９のすくい面となる部分に形成された前記溝部８ｆ，８ｆの前記各段付き刃９ｂとの境界面８ｆ′には、工具軸心ａに対して工具先端ａ′側ほど前記回転方向前側に位置するように傾斜するねじれ角βが設定されている。このねじれ角βは、工具軸心ａに対して０°〜２０°程度に設定されている。   Further, a boundary surface 8f ′ of the groove portions 8f and 8f formed on the rake face portion of each cutting edge 9 with each stepped blade 9b is on the tool tip a ′ side with respect to the tool axis a. The torsion angle β is set so as to incline so as to be located on the front side in the rotational direction. This twist angle β is set to about 0 ° to 20 ° with respect to the tool axis a.

前記ねじれ角βが２０°を超えると、切屑がカールしやくなり、またカールが２巻き以上となりやすく、１個あたりの重量が増加して吸引性能が低下する可能性がある。   When the twist angle β exceeds 20 °, the chips are likely to curl, and the curl tends to become two or more turns, which may increase the weight per piece and lower the suction performance.

前記ねじれ角βが小さいほど切屑の分断効果が向上するが、一方、ねじれ角βが小さくなるほど切削抵抗が大きくなるので、前記ねじれ角βは、３°〜１５°程度に設定することがより好ましい。   The smaller the twist angle β, the better the chip cutting effect. On the other hand, the smaller the twist angle β, the greater the cutting resistance. Therefore, the twist angle β is more preferably set to about 3 ° to 15 °. .

さらにまた、前記各段差部９ａは、前記工具先端ａ′から遠ざかるほど工具軸心ａに近くなるテーパ面、換言すれば先拡がりのテーパ面をなすように形成されている。具体的には、前記段差部９ａの延長線９ａ′と前記軸心ａとのなす角度θが１〜６°に設定されている。   Furthermore, each of the step portions 9a is formed so as to form a tapered surface that is closer to the tool axis a as it is farther from the tool tip a ', in other words, a taper surface that expands. Specifically, the angle θ between the extension line 9a ′ of the step 9a and the axis a is set to 1 to 6 °.

より好ましくは、図５に示すように、前記各段差部９ａの工具先端ａ′から遠い側の端部９ｃと隣接する段付き刃９ｂ′とで形成される隅部９ｄは、円弧状をなしており、かつ前記各段差部９ａの角度θは、工具軸心ａ方向の光ｄを照射した場合の前記段差部９ａの投影面ｃ内に前記隅部９ｄが位置する大きさに設定されている。   More preferably, as shown in FIG. 5, the corner 9d formed by the end 9c far from the tool tip a 'of each step 9a and the adjacent stepped blade 9b' has an arc shape. And the angle θ of each step 9a is set to a size such that the corner 9d is located within the projection plane c of the step 9a when the light d in the direction of the tool axis a is irradiated. Yes.

本実施例１によれば、各段付き刃９ｂを構成する各段差部９ａを、前記工具先端ａ′から遠ざかるほど工具軸心ａに近くなるいわゆる末広がりのテーパ面をなすように形成したので、切屑の分断性を向上でき、切屑の回収効率を向上できる。   According to the first embodiment, each stepped portion 9a constituting each stepped blade 9b is formed so as to form a so-called divergent tapered surface that becomes closer to the tool axis a as the distance from the tool tip a ′ increases. Chip separation can be improved, and chip recovery efficiency can be improved.

即ち、仮に前記段差部が工具先端から遠ざかるほど工具軸心から遠くなるいわゆる先細りのテーパ面をなすように形成されている場合は、各段付き刃によって切削が行われるとともに、前記先細りのテーパ面によっても切削が行われる場合が考えられる。その結果各段付き刃による切屑同士がテーパ面による切屑を介して繋がってしまう場合があった。   That is, if the stepped portion is formed so as to form a so-called tapered taper surface that becomes farther from the tool axis as the distance from the tool tip increases, cutting is performed by each stepped blade and the tapered taper surface. Depending on the case, cutting may be performed. As a result, the chips produced by the stepped blades may be connected via the chips formed by the tapered surfaces.

これに対して、本実施例では、段差部９ａを、前記先細りのテーパ面とは逆の先拡がりのテーパ面、つまり工具先端ａ′から遠ざかるほど工具軸心ａに近くなるテーパ面としたので、段差部９ａにおいて切削が行われることはほとんどなく、各段付き刃９ｂによる切屑同士を確実に分断できる。   On the other hand, in the present embodiment, the stepped portion 9a is a taper surface that is widened opposite to the taper taper surface, that is, a taper surface that is closer to the tool axis a away from the tool tip a ′. In addition, cutting is hardly performed at the stepped portion 9a, and the chips by the stepped blades 9b can be reliably separated.

さらにまた、各段差部９ａと隣接する段付き刃９ｂ′とがなす隅部９ｄを段差部９ａの工具軸心方向の光ｄによる投影面ｃ内に位置する大きさに設定したので、換言すれば、前記隅部９ｄが前記投影面ｃ内に位置するように前記角度θを設定したので、より確実に切屑の分断性を向上でき、切屑回収効率を向上できる。即ち、段差部９ａと隣接する段付き刃９ｂ′との隅部９ｄが、前記投影面ｃからはみ出る大きさに設定されている場合、そのはみ出た部分によっても切削が行われ、この切削された切屑部分が前記分断性に悪影響を与えるおそれがある。しかし本実施例では、前記隅部９ｄが、前記投影面ｃ内に位置しているので、前記隅部９ｄによる悪影響を回避でき、切屑の分断性をより一層向上できる。   Furthermore, since the corner 9d formed by each stepped portion 9a and the adjacent stepped blade 9b 'is set to a size positioned in the projection plane c by the light d in the tool axis direction of the stepped portion 9a, in other words, For example, since the angle θ is set so that the corner portion 9d is located in the projection plane c, the chip breaking property can be improved more reliably and the chip collection efficiency can be improved. That is, when the corner portion 9d between the stepped portion 9a and the adjacent stepped blade 9b 'is set to a size that protrudes from the projection surface c, cutting is also performed by the protruding portion, and this cutting is performed. There exists a possibility that a chip part may have a bad influence on the said parting property. However, in this embodiment, since the corner portion 9d is located in the projection plane c, it is possible to avoid an adverse effect due to the corner portion 9d and to further improve the chip breaking property.

ここで本発明の切屑吸引用工具において、前記段差部９ａの角度θ，ねじれ角βを変えた場合の切屑分断性に与える影響について試験を行った。   Here, in the chip suction tool of the present invention, a test was performed on the influence on the chip division property when the angle θ and the twist angle β of the stepped portion 9a were changed.

〔試験１〕
本試験１では、下記仕様の本発明に係る切屑吸引用工具及び比較例工具を使用して、下記の切削条件で加工を行い、その際に発生した切屑の形状を調べた。 [Test 1]
In the test 1, using the chip suction tool and the comparative example tool according to the present invention having the following specifications, processing was performed under the following cutting conditions, and the shape of the chips generated at that time was examined.

使用工具：
工具外径 φ６．８ｍｍ
段差部の角度 θ＝５°（本発明例工具）、逆方向にテーパを有するもの（比較例工具）
材質 超硬合金製
ねじれ角 β＝１０°
切削条件：
切削速度 Ｖｃ＝２０ｍ／ｍｉｎ
送り ｆ＝０．１ｍｍ／ｒｅｖ
被削材：ＦＣ２５
本試験１の結果、段差部の角度θ＝５°の本発明例工具では切屑が小さく分断できたのに対し、逆方向にテーパを有する比較例工具では、切屑が小さく分断されずに伸びてしまうものがあった。 Tools used:
Tool outer diameter φ6.8mm
Step part angle θ = 5 ° (invention tool), taper in the opposite direction (comparative tool)
Material Cemented carbide torsion angle β = 10 °
Cutting conditions:
Cutting speed Vc = 20m / min
Feed f = 0.1mm / rev
Work material: FC25
As a result of the test 1, chips of the present invention with the step portion angle θ = 5 ° could be divided into small pieces, whereas in the comparative example tool having a taper in the opposite direction, the chips were extended without being divided. There was something to end up with.

〔試験２〕
本試験２では、本発明に係る段差部の角度θを有する切屑吸引用工具において、ねじれ角βを変えた場合の切屑に与える影響について試験を行った。 [Test 2]
In this test 2, the effect on the chips when the twist angle β was changed in the chip suction tool having the step angle θ of the present invention was tested.

本試験２では、下記ねじれ角βを有する切屑吸引用工具を使用して、下記の切削条件で加工を行い、その際に発生した切屑の形状を調べた。   In this test 2, a chip suction tool having the following twist angle β was used for processing under the following cutting conditions, and the shape of the chips generated at that time was examined.

工具形状：
工具外径 φ６．８ｍｍ
段差部の角度 θ＝５°
材質 超硬合金製
ねじれ角 β＝０°〜３０°まで５°ずつ変化させた。 Tool shape:
Tool outer diameter φ6.8mm
Step angle θ = 5 °
Material Cemented carbide torsion angle β = 0 ° to 30 ° was changed in 5 ° increments.

切削条件：
切削速度 Ｖｃ＝４２．７ｍ／ｍｉｎ
送り ｆ＝０．１ｍｍ／ｒｅｖ
被削材：ＦＣ２５０
試験結果を図７（スケールは１目盛０．５mm）に示す。試験の結果、いずれの工具も切屑を小さく分断させることができたが、β＝２０°を超えるものは、カールした切屑が２巻き以上となって、切屑が大きくなっていることが分かった。 Cutting conditions:
Cutting speed Vc = 42.7 m / min
Feed f = 0.1mm / rev
Work material: FC250
The test results are shown in FIG. 7 (scale is 1 scale 0.5 mm). As a result of the test, all the tools were able to divide the chips into small pieces, but it was found that when β exceeds 20 °, the curled pieces had two or more turns and the chips were large.

なお、前記実施例では、前記段差部９ａが先拡がりのテーパ面をなす場合を説明したが、本発明には、前記段差部９ａが工具軸線ａと平行に形成されている場合も含まれる。段差部が平行の場合であっても、段差部が前記先細りのテーパ面をなしている場合よりも切屑の分断性を改善できる。   In addition, although the said Example demonstrated the case where the said level | step-difference part 9a makes the taper surface which spreads forward, the case where the said level | step-difference part 9a is formed in parallel with the tool axis line a is also included in this invention. Even when the stepped portions are parallel, chip separation can be improved as compared with the case where the stepped portions have the tapered surface.

１ 工作機械
８ａ 先端部
８ｆ 溝部
８ｆ′境界面
９ 切刃
９ａ 段差部
９ｂ 段付き刃
９ｂ′ 隣接する段付き刃
９ｃ 段差部の工具先端から遠い側の端部
９ｄ 隅部
１０ ドリル（切屑吸引用工具）
１５ 切屑吸引装置
１６ 切屑吸引孔
ａ 工具軸心
ｃ 投影面
β ねじれ角 DESCRIPTION OF SYMBOLS 1 Machine tool 8a Tip part 8f Groove part 8f 'Boundary surface 9 Cutting edge 9a Stepped part 9b Stepped blade 9b' Adjacent stepped blade 9c End part of the step part far from the tool tip 9d Corner part 10 Drill (for chip suction) tool)
15 Chip suction device 16 Chip suction hole a Tool axis c Projection plane β Torsion angle

Claims (3)

先端部に切刃が形成されるとともに、先端部に開口する切屑吸引孔を有し、切屑吸引装置を備えた工作機械に装着される切屑吸引用工具であって、
前記切刃は、工具軸心から径方向外方に向かって階段状に段差部が形成された複数の段付き刃で構成され、
前記各段差部は、前記工具軸心と平行に形成され、又は工具先端から遠ざかるほど工具軸心に近くなるテーパ面をなすように形成されている
ことを特徴とする切屑吸引用工具。 A cutting edge is formed at the tip, and has a chip suction hole that opens at the tip, and is a chip suction tool to be mounted on a machine tool equipped with a chip suction device,
The cutting blade is composed of a plurality of stepped blades in which stepped portions are formed stepwise from the tool axis toward the radially outer side,
Each said level | step-difference part is formed in parallel with the said tool axial center, or it is formed so that the taper surface which becomes near a tool axial center may be made, so that it is far from a tool front-end | tip, The chip suction tool characterized by the above-mentioned. 請求項１に記載の切屑吸引用工具において、
前記各段差部は、前記テーパ面をなしており、該各段差部の工具先端から遠い側の端部と隣接する段付き刃とがなす隅部は、弧状をなしており、かつ前記段差部の工具軸心方向の投影面内に位置する大きさに設定されている
ことを特徴とする切屑吸引用工具。 In the chip suction tool according to claim 1,
Each of the step portions has the tapered surface, and a corner portion formed by an end of the step portion far from the tool tip and an adjacent stepped blade has an arc shape, and the step portion A chip suction tool characterized in that it is set to a size located within the projection plane in the tool axis direction. 請求項１又２に記載の切屑吸引用工具において、
前記切刃のすくい面に溝部が形成され、該溝部は、前記段付き刃との境界面が前記工具軸心に対して工具先端側ほど回転方向前側に位置するよう傾斜するねじれ角を有し、該ねじれ角は、０°又は０°〜２０°に設定されている
ことを特徴とする切屑吸引用工具。 In the chip suction tool according to claim 1 or 2,
A groove is formed on the rake face of the cutting edge, and the groove has a torsion angle that is inclined so that a boundary surface with the stepped blade is positioned on the front side in the rotational direction toward the tool tip with respect to the tool axis. The twist suction angle is set to 0 ° or 0 ° to 20 °.
JP2011249830A 2011-11-15 2011-11-15 Chip suction tool Active JP5777028B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0435812U (en) * 1990-07-17 1992-03-25
JP2005014360A (en) * 2003-06-25 2005-01-20 Yunika Kk Drill
JP2005238403A (en) * 2004-02-27 2005-09-08 Kitakyushu Foundation For The Advancement Of Industry Science & Technology Rotary drilling tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0435812U (en) * 1990-07-17 1992-03-25
JP2005014360A (en) * 2003-06-25 2005-01-20 Yunika Kk Drill
JP2005238403A (en) * 2004-02-27 2005-09-08 Kitakyushu Foundation For The Advancement Of Industry Science & Technology Rotary drilling tool

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