JP2015223654A - Fine tool manufacturing method, and fine tool - Google Patents

Fine tool manufacturing method, and fine tool Download PDF

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JP2015223654A
JP2015223654A JP2014109168A JP2014109168A JP2015223654A JP 2015223654 A JP2015223654 A JP 2015223654A JP 2014109168 A JP2014109168 A JP 2014109168A JP 2014109168 A JP2014109168 A JP 2014109168A JP 2015223654 A JP2015223654 A JP 2015223654A
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cylindrical portion
fine tool
wire
coolant
tip
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JP2015223654A5 (en
JP6335654B2 (en
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三井　健一
Kenichi Mitsui
健一 三井
豊 三井
Yutaka Mitsui
豊 三井
究 三橋
Kiwamu Mitsuhashi
究 三橋
肇 角井
Hajime Kadoi
肇 角井
満 三井
Mitsuru Mitsui
満 三井
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MITSUI KOKUIN KK
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Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of boring a coolant hole in a fine tool made of CBN or PCD at a leading end and having an external diameter less than 2.0 mm.SOLUTION: A wire 18 is advanced in a manner of a single stroke. In a tabular raw material 13, there are cut in the recited orders by the wire 18: a first groove 21 parallel to an edge 19; a second groove 22 perpendicular to the edge 19; a portion 23 of the outer circumference of a columnar part; a U-shaped intrusion line 24, and the remainder 25 of the outer circumference of the columnar part. The U-shaped intrusion line 24 forms a coolant passage. The U-shaped coolant passage is formed simultaneously with the cutting of the columnar part so that a coolant hole can be opened in a minute tool having an external diameter less than 2.0 mm at the leading end.

Description

本発明は、先端に外径が２．０ｍｍ以下の円柱部を有する微細工具に関する。   The present invention relates to a fine tool having a cylindrical portion with an outer diameter of 2.0 mm or less at the tip.

エンドミルは、外周面と先端面に切れ刃を有するシャンクタイプフライスの総称であり、外周面の切れ刃と先端面の切れ刃とでワークを切削できるために、金属加工業界で広く採用されている。   End mill is a general term for shank type milling cutters that have cutting edges on the outer peripheral surface and tip surface, and is widely used in the metalworking industry because it can cut workpieces with the cutting edge on the outer peripheral surface and the cutting edge on the tip surface. .

高速で回転するエンドミルに、クーラント（冷却液）を噴射することで、エンドミル及びワークの温度上昇を抑えることが行われている。だたし、噴射量の割りにエンドミルの冷却効果は小さいことが懸念される。
対策として、少ない量のクーラントで効率よくエンドミルを冷却する技術が提案されている（例えば、特許文献１（図６）参照。）。 Injecting coolant (coolant) into an end mill that rotates at high speed suppresses temperature rise of the end mill and the workpiece. However, there is a concern that the cooling effect of the end mill is small for the injection amount.
As a countermeasure, a technique for efficiently cooling the end mill with a small amount of coolant has been proposed (see, for example, Patent Document 1 (FIG. 6)).

特許文献１の図６に、ソリッドボールエンドミルが示されており、このボールエンドミルは、本体（１）（括弧付き数字は、特許文献１に記載された符号を示す。以下同様）にクーラント穴（６）を備え、このクーラント穴（６）を介してクーラントを先端に供給し、先端から噴射する。刃部（２）に直接クーラントが供給されるため、少ない量のクーラントでエンドミルを冷却することができる。   FIG. 6 of Patent Document 1 shows a solid ball end mill. This ball end mill has a coolant hole (in the parenthesis, the reference numerals described in Patent Document 1. The same applies hereinafter). 6), the coolant is supplied to the tip through the coolant hole (6) and sprayed from the tip. Since the coolant is directly supplied to the blade portion (2), the end mill can be cooled with a small amount of coolant.

特許文献１の段落番号［００１０］の説明によれば、本体（１）の直径（外径）は６ｍｍであり、クーラント穴（６）の穴径は１ｍｍである。本体（１）は超硬合金製である。クーラント穴（６）は、レーザ加工、放電加工、ケミカル加工により穴開けが行われると推定される。   According to the description of paragraph [0010] in Patent Document 1, the diameter (outer diameter) of the main body (1) is 6 mm, and the hole diameter of the coolant hole (6) is 1 mm. The main body (1) is made of cemented carbide. The coolant hole (6) is presumed to be drilled by laser machining, electric discharge machining, or chemical machining.

ただし、被切削物であるワークが硬い場合には、本体（１）の寿命が短くなる。この場合は、超硬合金より硬いＣＢＮチップを刃部に適用する構造が有効となる（例えば、特許文献２（図４）参照。）。   However, the life of the main body (1) is shortened when the work as the workpiece is hard. In this case, a structure in which a CBN tip harder than a cemented carbide is applied to the blade portion is effective (for example, see Patent Document 2 (FIG. 4)).

特許文献２の図４に、ＣＢＮチップ（５）、（６）（括弧付き数字は、特許文献２に記載された符号を示す。以下同様）を備えるボールエンドミルが示されている。ＣＢＮチップ（５）、（６）と干渉しない部位に、クーラント孔（７）、（８）が設けられている。   FIG. 4 of Patent Document 2 shows a ball end mill provided with CBN chips (5) and (6) (the numbers in parentheses indicate the reference numerals described in Patent Document 2. The same applies hereinafter). Coolant holes (7) and (8) are provided at portions that do not interfere with the CBN chips (5) and (6).

特許文献２には、ボールエンドミルの先端の外径が記載されていない。特許文献２記載のボールエンドミルの先端の外径は、特許文献１と同様に６ｍｍ程度と推定される。   Patent Document 2 does not describe the outer diameter of the tip of the ball end mill. The outer diameter of the tip of the ball end mill described in Patent Document 2 is estimated to be about 6 mm as in Patent Document 1.

特許文献１、２の技術では、先端がＣＢＮ又はＰＣＤで構成され、先端の外径が２．０ｍｍを超えないような微細工具にクーラント穴（孔）を開けることができない。
よって、従来は、クーラント穴（孔）を有しないソリッド型の微細工具に、クーラントを噴射することで、切削を実施してきた。 In the techniques of Patent Documents 1 and 2, the tip of the tip is made of CBN or PCD, and a coolant hole (hole) cannot be formed in a fine tool whose outer diameter does not exceed 2.0 mm.
Therefore, conventionally, cutting has been carried out by injecting coolant onto a solid fine tool having no coolant holes (holes).

しかし、微細工具であってもクーラント穴を設けるべきであるという要求が出る中、クーラント穴を有する微細工具の提供が求められる。   However, there is a demand for providing a coolant hole even if it is a micro tool, and it is required to provide a micro tool having a coolant hole.

特開平１１−９０７２１号公報JP-A-11-90721 特開２００３−５３６１８公報JP 2003-53618 A

本発明は、先端がＣＢＮ又はＰＣＤで構成され、先端の外径が２．０ｍｍを超えないような微細工具にクーラント穴（孔）を開けることができる技術を提供することを課題とする。   This invention makes it a subject to provide the technique which can make a coolant hole (hole) in the fine tool by which the front-end | tip is comprised by CBN or PCD and the outer diameter of a front-end | tip does not exceed 2.0 mm.

請求項１に係る発明は、金属板の一方の面に、立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層を形成してなる板状素材を準備する準備工程と、
ワイヤカット放電加工機のワイヤで前記板状素材をカットして、前記金属板の部位に相当する金属層と前記立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層の部位に相当する非金属層からなり、外径が２．０ｍｍを超えない円柱部を切り出す切り出し工程と、
切り出された円柱部に含まれる前記金属層を前記円柱部の外径より大きな径のシャンクにロー付け固定する要領で前記シャンクの一端に前記円柱部を一体化する一体化工程と、
前記円柱部の先端に刃付けを行う刃付け工程とからなる微細工具の製造方法において、
前記切り出し工程では、前記円柱部の外周線の一部と、この外周線の一部の先端から前記円柱部の外周線の内部へＵ又はΩを描いて進入する進入線と、この進入線の先端から延びる前記外周線の残部とが、連続するよう前記ワイヤを一筆書きの要領で相対的に移動することを特徴とする。 The invention according to claim 1 is a preparation step of preparing a plate-like material formed by forming a cubic boron nitride layer or a polycrystalline sintered diamond layer on one surface of a metal plate;
The plate material is cut with a wire of a wire-cut electric discharge machine, and a metal layer corresponding to the metal plate portion and a non-metallic layer corresponding to the cubic boron nitride layer or polycrystalline sintered diamond layer portion. A cutting step of cutting out a cylindrical portion whose outer diameter does not exceed 2.0 mm;
An integration step of integrating the cylindrical portion with one end of the shank in a manner to braze and fix the metal layer included in the cut cylindrical portion to a shank having a diameter larger than the outer diameter of the cylindrical portion;
In the manufacturing method of a fine tool consisting of a cutting step for cutting the tip of the cylindrical portion,
In the cutting step, a part of the outer peripheral line of the cylindrical part, an approach line entering U or Ω from the tip of a part of the outer peripheral line into the outer peripheral line of the cylindrical part, The wire is relatively moved in the manner of one stroke so that the remaining portion of the outer peripheral line extending from the tip is continuous.

請求項２に係る発明によれば、請求項１記載の微細工具の製造方法で製造され、円柱部の外周に軸方向に延びるＵ溝状のクーラント通路を備えていることを特徴とする微細工具が提供される。   According to a second aspect of the present invention, the fine tool is manufactured by the method for manufacturing a fine tool according to the first aspect, and includes a U-shaped coolant passage extending in the axial direction on the outer periphery of the cylindrical portion. Is provided.

請求項３に係る発明によれば、請求項１記載の微細工具の製造方法で製造され、円柱部内に軸方向に延びるΩ字断面のクーラント通路を備えていることを特徴とする微細工具が提供される。   According to a third aspect of the present invention, there is provided a fine tool which is manufactured by the method for manufacturing a fine tool according to claim 1 and has a coolant passage having an Ω-shaped cross section extending in the axial direction in the cylindrical portion. Is done.

請求項１に係る発明では、一筆書きの要領で、ワイヤカット放電加工機のワイヤで円柱部にＵ溝又はΩ字断面の穴を形成する。Ｕ溝又はΩ字断面の穴にクーラントを流すことができる。よって、本発明によれば、先端がＣＢＮ又はＰＣＤで構成され、先端の外径が２．０ｍｍを超えないような微細工具にクーラント穴を開けることができる技術が提供される。   In the invention according to claim 1, a U-groove or a Ω-shaped cross-section hole is formed in the cylindrical portion with a wire of a wire-cut electric discharge machine in the manner of one stroke. Coolant can flow through a U-groove or a hole with an Ω-shaped cross section. Therefore, according to the present invention, there is provided a technique capable of forming a coolant hole in a fine tool whose tip is made of CBN or PCD and whose outer diameter does not exceed 2.0 mm.

加えて、円柱部を切り出すときに一括してＵ溝又はΩ字断面の穴を形成する。円柱部の切り出しとクーラント穴加工（穴加工が可能であると仮定。）とを別々に実施することに比べて、本発明によれば、円柱部の切り出しに含めてＵ溝又はΩ字断面の穴を形成するため、加工工数の増加を抑えることができ、加工費用を圧縮することができる。結果、クーラント穴無しの微細工具並のコストでクーラント穴有り微細工具を製造することができる。   In addition, when the cylindrical portion is cut out, a U groove or a hole having an Ω-shaped cross section is formed in a lump. Compared to performing the cutting of the cylindrical portion and coolant drilling (assuming that drilling is possible) separately, according to the present invention, the cutting of the cylindrical portion includes the U groove or the Ω-shaped cross section. Since the hole is formed, an increase in processing man-hours can be suppressed, and processing costs can be reduced. As a result, a fine tool with a coolant hole can be manufactured at the same cost as a fine tool without a coolant hole.

請求項２に係る発明では、微細工具は、円柱部の外周に軸方向に延びるＵ溝状のクーラント通路を備えている。回転中心に先尖り部がある場合に、この先尖り部と干渉しない部位にクーラント通路を設けることができる。   In the invention according to claim 2, the fine tool includes a U-shaped coolant passage extending in the axial direction on the outer periphery of the cylindrical portion. When there is a pointed portion at the center of rotation, a coolant passage can be provided in a portion that does not interfere with the pointed portion.

請求項３に係る発明では、微細工具は、円柱部内に軸方向に延びるΩ字断面のクーラント通路を備えている。スクエアタイプのエンドミルのように回転中心にクーラント通路を開口できる場合に好適である。   In the invention according to claim 3, the fine tool includes a coolant passage having an Ω-shaped cross section extending in the axial direction in the cylindrical portion. It is suitable when the coolant passage can be opened at the center of rotation like a square type end mill.

本発明の準備工程を説明する図である。It is a figure explaining the preparatory process of this invention. 本発明の切り出し工程を説明する図である。It is a figure explaining the cutting-out process of this invention. 本発明の切り出し工程を説明する図である。It is a figure explaining the cutting-out process of this invention. 本発明の一体化工程を説明する図である。It is a figure explaining the integration process of this invention. 本発明の刃付け工程を説明する図兼微細工具の断面図である。It is sectional drawing of the figure and fine tool explaining the blade attachment process of this invention. 別の微細工具の断面図である。It is sectional drawing of another fine tool. 変更例での切り出し工程を説明する図である。It is a figure explaining the cutting-out process in the example of a change. 変更例での切り出し工程を説明する図である。It is a figure explaining the cutting-out process in the example of a change. 変更例での一体化工程を説明する図である。It is a figure explaining the integration process in the example of a change. 変更例での刃付け工程を説明する図兼微細工具の断面図である。It is sectional drawing of the figure and fine tool explaining the blade attachment process in the example of a change.

本発明の実施の形態を添付図に基づいて以下に説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１に示すように、金属板１１の一方の面に、立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層１２を形成してなる板状素材１３を準備する（準備工程）。
詳しくは、超硬円板等からなる金属板１１の上面に、立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層１２を積層してなる板状素材１３を、適当な鋼板１４に半田１５で固定する。 As shown in FIG. 1, a plate-like material 13 formed by forming a cubic boron nitride layer or a polycrystalline sintered diamond layer 12 on one surface of a metal plate 11 is prepared (preparation step).
Specifically, a plate-like material 13 formed by laminating a cubic boron nitride layer or a polycrystalline sintered diamond layer 12 on the upper surface of a metal plate 11 made of a hard disc or the like is fixed to an appropriate steel plate 14 with solder 15. To do.

そして、鋼板１４をワイヤカット放電加工機のテーブルに載せてクランパ１６でクランプする。鋼板１４は必須ではないが、板状素材１３を直接クランプするよりは、鋼板１４を介して抑える方がクランプが容易となる。なお、立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層１２の厚さは０．５〜２．０ｍｍ、金属板１１の厚さは５．０〜１３．０ｍｍである。   Then, the steel plate 14 is placed on the table of the wire cut electric discharge machine and clamped by the clamper 16. Although the steel plate 14 is not indispensable, it is easier to clamp the plate-like material 13 through the steel plate 14 than to directly clamp the plate-like material 13. The cubic boron nitride layer or the polycrystalline sintered diamond layer 12 has a thickness of 0.5 to 2.0 mm, and the metal plate 11 has a thickness of 5.0 to 13.0 mm.

次に、ワイヤカット放電加工機で外径が２．０ｍｍを超えない円柱部を切り出す切り出し工程を、図２、図３に基づいて説明する。なお、板状素材１３の縁１９は曲線であるが、図２、図３では便宜的に直線とした。   Next, the cutting process which cuts out the cylindrical part whose outer diameter does not exceed 2.0 mm with a wire cut electric discharge machine is demonstrated based on FIG. 2, FIG. Although the edge 19 of the plate-like material 13 is a curved line, it is a straight line for convenience in FIGS.

図２（ａ）に示すように、縁１９に平行になるように、板状素材１３にワイヤカット放電加工機のワイヤ１８で第１溝２１を入れ、更に縁１９に直角に第２溝２２を切り込む。以降の切り込み予定線を想像線で示す。この想像線のうち、円柱部の外周線の一部２３を、ワイヤ１８で切り込む。
図２（ｂ）に示すように、円柱部の外周線の一部２３の先端から円柱部の外周線の内部に進入するＵ字進入線２４をワイヤ１８で切り込む。
図２（ｃ）に示すように、円柱部の外周線の残部２５を、ワイヤ１８で切り込む。
これで、図２（ｄ）の形態が得られる。 As shown in FIG. 2 (a), the first groove 21 is put in the plate material 13 with the wire 18 of the wire cut electric discharge machine so as to be parallel to the edge 19, and the second groove 22 is perpendicular to the edge 19. Cut in. The subsequent cut lines are indicated by imaginary lines. Of this imaginary line, a part 23 of the outer peripheral line of the cylindrical portion is cut with a wire 18.
As shown in FIG. 2B, a U-shaped entry line 24 that enters the inside of the outer peripheral line of the cylindrical portion from the tip of a part 23 of the outer peripheral line of the cylindrical portion is cut with a wire 18.
As shown in FIG. 2C, the remaining portion 25 of the outer peripheral line of the cylindrical portion is cut with a wire 18.
Thus, the form of FIG. 2D is obtained.

図３（ａ）に示すように、縁１９に平行に第１溝（図２（ａ）、符号２１）に相当する溝２６を入れ、図２（ｂ）〜（ｄ）を繰り返す。得られた溝２１〜２６で分離することで、図３（ｂ）に示すように、幹部２８と円柱部２９、２９の形態が得られる。
図３（ｃ）に示すように、円柱部２９、２９を幹部２８から分離する。
図３（ｄ）に示すように、円柱部２９の外周に軸方向に延びるＵ溝状のクーラント通路３１が形成されている。 As shown in FIG. 3A, a groove 26 corresponding to the first groove (FIG. 2A, reference numeral 21) is inserted in parallel with the edge 19, and FIGS. 2B to 2D are repeated. By separating with the obtained grooves 21 to 26, the form of the trunk portion 28 and the columnar portions 29 and 29 is obtained as shown in FIG.
As shown in FIG. 3C, the cylindrical portions 29 and 29 are separated from the trunk portion 28.
As shown in FIG. 3D, a U-shaped coolant passage 31 extending in the axial direction is formed on the outer periphery of the cylindrical portion 29.

図４に示すように、円柱部２９の外径より大きな径のシャンク３２を準備する。このシャンク３２には、中心からオフセットした位置に予めクーラント供給路３３が設けられている。このクーラント供給路３３とＵ溝状のクーラント通路３１を合致させつつ、円柱部２９の金属層３４をシャンク３２の一端にロー付けで固定する（一体化工程）。   As shown in FIG. 4, a shank 32 having a diameter larger than the outer diameter of the cylindrical portion 29 is prepared. The shank 32 is provided with a coolant supply path 33 in advance at a position offset from the center. The metal layer 34 of the cylindrical portion 29 is fixed to one end of the shank 32 by brazing while matching the coolant supply path 33 and the U-shaped coolant path 31 (integration step).

次に、図５に示すように、円柱部２９の非金属層（立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層）３５に、レ断面の刃３６を形成する（刃付け工程）。刃３６の先がＵ溝状のクーラント通路３１に干渉しない。結果、円柱部２９の外周に軸方向に延びるＵ溝状のクーラント通路３１を備えた微細工具３７が得られる。円柱部２９の外径は、２．０ｍｍ以下であり、このような微細工具３７にクーラント通路３１を設けることができた。
または、図６に示すように、円柱部２９の先端に、Ｖ断面の刃３８を形成するようにしてもよい。 Next, as shown in FIG. 5, a blade 36 having a cross section is formed on the non-metal layer (cubic boron nitride layer or polycrystalline sintered diamond layer) 35 of the cylindrical portion 29 (blading step). The tip of the blade 36 does not interfere with the U-shaped coolant passage 31. As a result, a fine tool 37 having a U-shaped coolant passage 31 extending in the axial direction on the outer periphery of the cylindrical portion 29 is obtained. The outer diameter of the cylindrical portion 29 is 2.0 mm or less, and the coolant passage 31 can be provided in such a fine tool 37.
Alternatively, as shown in FIG. 6, a V-shaped blade 38 may be formed at the tip of the cylindrical portion 29.

次に、変更例を説明する。
図７（ａ）に示すように、縁１９に平行になるように、板状素材１３にワイヤ１８で第１溝２１を入れ、更に縁１９に直角に第２溝２２を切り込む。以降の切り込み予定線を想像線で示す。この想像線のうち、円柱部の外周線の一部２３を、ワイヤ１８で切り込む。
図７（ｂ）に示すように、円柱部の外周線の一部２３の先端から円柱部の外周線の内部に進入するΩ字進入線４１をワイヤ１８で切り込む。
図７（ｃ）に示すように、円柱部の外周線の残部２５を、ワイヤ１８で切り込む。
これで、図７（ｄ）の形態が得られる。 Next, a modification example will be described.
As shown in FIG. 7A, the first groove 21 is inserted into the plate-like material 13 with the wire 18 and the second groove 22 is cut at a right angle to the edge 19 so as to be parallel to the edge 19. The subsequent cut lines are indicated by imaginary lines. Of this imaginary line, a part 23 of the outer peripheral line of the cylindrical portion is cut with a wire 18.
As shown in FIG. 7 (b), the Ω-shaped entry line 41 entering the inside of the outer peripheral line of the cylindrical portion from the tip of a part 23 of the outer peripheral line of the cylindrical portion is cut with the wire 18.
As shown in FIG. 7C, the remaining portion 25 of the outer peripheral line of the cylindrical portion is cut with a wire 18.
Thus, the form of FIG. 7D is obtained.

図８（ａ）に示すように、縁１９に平行に溝２６を入れ、図７（ｂ）〜（ｄ）を繰り返す。得られた溝２１〜２６、４１で分離することで、図８（ｂ）に示すように、幹部２８と円柱部２９、２９の形態が得られる。
図８（ｃ）に示すように、円柱部２９、２９を幹部２８から分離する。
図８（ｄ）に示すように、円柱部２９の中心に軸方向に延びるΩ字断面のクーラント通路４２が形成されている。 As shown in FIG. 8A, a groove 26 is inserted in parallel with the edge 19, and FIGS. 7B to 7D are repeated. By separating with the obtained grooves 21 to 26 and 41, the form of the trunk portion 28 and the cylindrical portions 29 and 29 is obtained as shown in FIG.
As shown in FIG. 8C, the cylindrical portions 29 and 29 are separated from the trunk portion 28.
As shown in FIG. 8D, an Ω-shaped coolant passage 42 extending in the axial direction is formed at the center of the cylindrical portion 29.

図９に示すように、円柱部２９の外径より大きな径のシャンク３２を準備する。このシャンク３２には中心に予めクーラント供給路３３が設けられている。このクーラント供給路３３とΩ字断面のクーラント通路４２を合致させつつ、円柱部２９の金属層３４をシャンク３２の一端にロー付けで固定する（一体化工程）。   As shown in FIG. 9, a shank 32 having a diameter larger than the outer diameter of the cylindrical portion 29 is prepared. A coolant supply path 33 is provided in the center of the shank 32 in advance. The metal layer 34 of the cylindrical portion 29 is fixed to one end of the shank 32 by brazing while matching the coolant supply path 33 and the coolant path 42 having an Ω-shaped cross section (integration process).

次に、図１０に示すように、円柱部２９の先端の両隅に、刃４３、４３を形成する（刃付け工程）。刃４３、４３がΩ字断面のクーラント通路４２に干渉しない。結果、円柱部２９の外周に軸方向に延びるΩ字断面のクーラント通路４２を備えた微細工具２７が得られる。円柱部２９の外径は、２．０ｍｍ以下であり、このような微細工具２７にクーラント通路４２を設けることができた。   Next, as shown in FIG. 10, blades 43 and 43 are formed at both corners of the tip of the cylindrical portion 29 (blade attaching step). The blades 43 do not interfere with the coolant passage 42 having an Ω-shaped cross section. As a result, the fine tool 27 having the coolant passage 42 having an Ω-shaped cross section extending in the axial direction on the outer periphery of the cylindrical portion 29 is obtained. The outer diameter of the cylindrical portion 29 is 2.0 mm or less, and the coolant passage 42 can be provided in such a fine tool 27.

なお、本発明の微細工具は、エンドミルの他、ドリルであってもよい。   The fine tool of the present invention may be a drill in addition to an end mill.

また、２．０ｍｍ以下である円柱部２９の外径は、１．０ｍｍ以下、好ましくは０．５〜１．０ｍｍの範囲であってもよい。すなわち、本発明は、外径が０．５〜１．０ｍｍの超微細工具に適用することができる。結果、従来法ではクーラント通路を設けることが困難であった１．０ｍｍ以下の径の超微細工具に、本発明によりクーラント通路が形成可能となる。   Moreover, the outer diameter of the cylindrical part 29 which is 2.0 mm or less may be 1.0 mm or less, Preferably it may be the range of 0.5-1.0 mm. That is, the present invention can be applied to an ultrafine tool having an outer diameter of 0.5 to 1.0 mm. As a result, the coolant passage can be formed by the present invention in an ultrafine tool having a diameter of 1.0 mm or less, which has been difficult to provide the coolant passage by the conventional method.

本発明は、外径が２．０ｍｍ以下の微細工具に好適である。   The present invention is suitable for a fine tool having an outer diameter of 2.0 mm or less.

１１…金属板、１２…立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層、１３…板状素材、１８…ワイヤカット放電加工機のワイヤ、２３…円柱部の外周線の一部、２４…進入線（Ｕ字進入線）、２５…円柱部の外周線の残部、２９…円柱部、３１…Ｕ溝状のクーラント通路、３２…シャンク、３７…微細工具、４１…進入線（Ω字進入線）、４２…Ω字断面のクーラント通路４２。   DESCRIPTION OF SYMBOLS 11 ... Metal plate, 12 ... Cubic boron nitride layer or a polycrystalline sintered diamond layer, 13 ... Plate-shaped raw material, 18 ... Wire of a wire-cut electric discharge machine, 23 ... Part of the outer periphery of a cylindrical part, 24 ... Entry Line (U-shaped approach line), 25: Remaining outer peripheral line of cylindrical part, 29 ... Cylindrical part, 31 ... U-groove coolant passage, 32 ... Shank, 37 ... Fine tool, 41 ... Enter line (Ω-shaped approach line) ), 42... Coolant passage 42 having an Ω-shaped cross section.

Claims (3)

金属板の一方の面に、立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層を形成してなる板状素材を準備する準備工程と、
ワイヤカット放電加工機のワイヤで前記板状素材をカットして、前記金属板の部位に相当する金属層と前記立方晶窒化ホウ素層又は多結晶焼結ダイヤモンド層の部位に相当する非金属層からなり、外径が２．０ｍｍを超えない円柱部を切り出す切り出し工程と、
切り出された円柱部に含まれる前記金属層を前記円柱部の外径より大きな径のシャンクにロー付け固定する要領で前記シャンクの一端に前記円柱部を一体化する一体化工程と、
前記円柱部の先端に刃付けを行う刃付け工程とからなる微細工具の製造方法において、
前記切り出し工程では、前記円柱部の外周線の一部と、この外周線の一部の先端から前記円柱部の外周線の内部へＵ又はΩを描いて進入する進入線と、この進入線の先端から延びる前記外周線の残部とが、連続するよう前記ワイヤを一筆書きの要領で相対的に移動することを特徴とする微細工具の製造方法。 A preparation step of preparing a plate-like material formed by forming a cubic boron nitride layer or a polycrystalline sintered diamond layer on one surface of a metal plate;
The plate material is cut with a wire of a wire-cut electric discharge machine, and a metal layer corresponding to the metal plate portion and a non-metallic layer corresponding to the cubic boron nitride layer or polycrystalline sintered diamond layer portion. A cutting step of cutting out a cylindrical portion whose outer diameter does not exceed 2.0 mm;
An integration step of integrating the cylindrical portion with one end of the shank in a manner to braze and fix the metal layer included in the cut cylindrical portion to a shank having a diameter larger than the outer diameter of the cylindrical portion;
In the manufacturing method of a fine tool consisting of a cutting step for cutting the tip of the cylindrical portion,
In the cutting step, a part of the outer peripheral line of the cylindrical part, an approach line entering U or Ω from the tip of a part of the outer peripheral line into the outer peripheral line of the cylindrical part, A method of manufacturing a fine tool, wherein the wire is relatively moved in a manner of one stroke so that the remaining portion of the outer peripheral line extending from the tip is continuous. 請求項１記載の微細工具の製造方法で製造され、前記円柱部の外周に軸方向に延びるＵ溝状のクーラント通路を備えていることを特徴とする微細工具。   A fine tool manufactured by the method for manufacturing a fine tool according to claim 1, further comprising a U-shaped coolant passage extending in an axial direction on an outer periphery of the cylindrical portion. 請求項１記載の微細工具の製造方法で製造され、前記円柱部内に軸方向に延びるΩ字断面のクーラント通路を備えていることを特徴とする微細工具。   A fine tool manufactured by the method for manufacturing a fine tool according to claim 1, comprising a coolant passage having an Ω-shaped cross section extending in the axial direction in the cylindrical portion.
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