JP7088968B2 - Drill for magnetic material that fills through holes in the substrate - Google Patents

Drill for magnetic material that fills through holes in the substrate Download PDF

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JP7088968B2
JP7088968B2 JP2020003433A JP2020003433A JP7088968B2 JP 7088968 B2 JP7088968 B2 JP 7088968B2 JP 2020003433 A JP2020003433 A JP 2020003433A JP 2020003433 A JP2020003433 A JP 2020003433A JP 7088968 B2 JP7088968 B2 JP 7088968B2
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cutting edge
drill
edge portion
hole
magnetic material
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JP2021109396A (en
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勉 山内
壮馬 奥田
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Ibiden Co Ltd
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Ibiden Co Ltd
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本発明は、プリント配線板のコア基板等に用いられる基板の貫通孔内に充填された磁性体にさらに貫通孔を形成するためのドリルに関する。 The present invention relates to a drill for further forming a through hole in a magnetic material filled in a through hole of a substrate used for a core substrate or the like of a printed wiring board.

一般に、プリント配線板には多層化による基板の反りが課題として存在し、この反りを防止するためコア基板が、絶縁樹脂中に補強繊維としてガラス繊維を含有する場合がある。 In general, the printed wiring board has a problem of warpage of the substrate due to the multi-layered structure, and in order to prevent this warpage, the core substrate may contain glass fiber as a reinforcing fiber in the insulating resin.

このようなガラス繊維強化基板にスルーホール導体を設けるための貫通孔を孔明け加工するために従来、例えば特許文献１により、剛性を高めたドリルが提案されており、このドリルは、切屑排出溝を１条のみとするとともに、刃先部の先端逃げ面を多段面状として、逃げ面同士の交差稜線の少なくとも一つが被削材に接触するようにしている。 Conventionally, for example, Patent Document 1 has proposed a drill having increased rigidity in order to drill a through hole for providing a through-hole conductor in such a glass fiber reinforced substrate, and this drill has a chip discharge groove. The number is only one, and the flanks at the tip of the cutting edge are multi-stepped so that at least one of the intersecting ridges between the flanks comes into contact with the work material.

特開２００４－０３４２１３号公報Japanese Unexamined Patent Publication No. 2004-0342113

ところで、プリント配線板のコア基板等に用いられる基板の貫通孔内に充填された磁性体にさらに貫通孔を形成し、その貫通孔内にめっきでスルーホール導体を設けて磁性体の電磁誘導により電流損失を抑制する場合がある。 By the way, a through hole is further formed in the magnetic material filled in the through hole of the substrate used for the core substrate of the printed wiring board, and a through hole conductor is provided in the through hole by plating by electromagnetic induction of the magnetic material. It may suppress the current loss.

しかしながら上記従来のドリルでは、磁性体への貫通孔の孔明けの際に、ドリルで明けた孔の内壁面とドリル外周面とが接触することでスミアが発生し、磁性体はデスミアできない材料であるため、スミアの発生を抑制できるドリル形状が必要となるという問題があった。 However, in the above-mentioned conventional drill, when a through hole is drilled in a magnetic material, smear is generated due to contact between the inner wall surface of the hole drilled by the drill and the outer peripheral surface of the drill, and the magnetic material is a material that cannot be desmeared. Therefore, there is a problem that a drill shape capable of suppressing the generation of smear is required.

本発明の目的は、プリント配線板のコア基板等に用いられる基板の貫通孔内に充填された磁性体にさらに貫通孔を形成するためのドリルであって、スミアの発生を抑制できるドリルを提供することにある。 An object of the present invention is to provide a drill for further forming a through hole in a magnetic material filled in a through hole of a substrate used for a core substrate or the like of a printed wiring board, and a drill capable of suppressing the generation of smear. To do.

本発明の基板の貫通孔充填磁性体用ドリルは、基板の貫通孔内に充填された磁性体にさらに貫通孔を形成するためのドリルであって、
ドリル先端側の刃先部と、
前記刃先部の基端に繋がる、その刃先部よりも小径のネック部と、
前記刃先部の先端から前記ネック部にかけて螺旋状に形成された１条の主溝と、
前記刃先部の先端から前記ネック部に繋がる部分まで前記主溝に沿って前記刃先部のみに形成された副溝と、を備え、
前記刃先部がその先端付近の最大径部から基端に向けて縮径しており、かつ、前記刃先部が前記ネック部に繋がる部分にフィレット形状を有している。 The drill for a magnetic material for filling a through hole in a substrate of the present invention is a drill for further forming a through hole in a magnetic material filled in the through hole of the substrate.
The cutting edge on the tip side of the drill and
A neck portion connected to the base end of the cutting edge portion and having a diameter smaller than that of the cutting edge portion,
A single main groove formed spirally from the tip of the cutting edge portion to the neck portion, and
A sub-groove formed only in the cutting edge portion along the main groove from the tip of the cutting edge portion to the portion connected to the neck portion is provided.
The cutting edge portion has a reduced diameter from the maximum diameter portion near the tip thereof toward the base end , and has a fillet shape at a portion where the cutting edge portion is connected to the neck portion .

本発明の基板の貫通孔充填磁性体用ドリルの一実施形態を示す側面図である。It is a side view which shows one Embodiment of the drill for a magnetic material for filling a through hole of a substrate of this invention. 上記実施形態の基板の貫通孔充填磁性体用ドリルの刃先部を拡大して示す正面図である。It is a front view which shows the cutting edge part of the drill for the magnetic material for filling a through hole of the substrate of the said embodiment in an enlarged manner. 上記実施形態の基板の貫通孔充填磁性体用ドリルの刃先部外周面の傾斜を示す説明図である。It is explanatory drawing which shows the inclination of the peripheral surface of the cutting edge portion of the drill for a magnetic material for filling a through hole of a substrate of the said embodiment.

以下、本発明の基板の貫通孔充填磁性体用ドリルの一実施形態が図面に基づいて説明される。図１は、本発明の基板の貫通孔充填磁性体用ドリルの一実施形態を示す側面図である。図２は、上記実施形態の基板の貫通孔充填磁性体用ドリルの刃先部を拡大して示す正面図である。図３は、上記実施形態の基板の貫通孔充填磁性体用ドリルの刃先部外周面の傾斜を示す説明図である。 Hereinafter, an embodiment of a drill for a magnetic material for filling through holes in a substrate of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of a drill for a magnetic material for filling a through hole in a substrate of the present invention. FIG. 2 is an enlarged front view showing a cutting edge portion of a drill for a magnetic material for filling a through hole in a substrate according to the above embodiment. FIG. 3 is an explanatory diagram showing the inclination of the outer peripheral surface of the cutting edge portion of the drill for a magnetic material for filling through holes in the substrate of the above embodiment.

図中符号１で示されるこの実施形態の基板の貫通孔充填磁性体用ドリルは、プリント配線板のコア基板等に用いられる基板の貫通孔内に充填されたフェライト等の磁性体にさらに貫通孔を形成するためのドリルであって、工作機械のチャック等に把持されるシャンク２と、そのシャンク２と同一軸線上に配置されてシャンク２に一体的に結合されるドリル本体３とを備えており、ドリル本体３は、ドリル先端側の刃先部４と、その刃先部４の基端に繋がる、その刃先部４よりも小径のネック部５とを有して、アンダーカットタイプとされている。 The drill for a magnetic material for filling a through hole in a substrate of this embodiment, which is indicated by reference numeral 1 in the figure, further has a through hole in a magnetic material such as ferrite filled in the through hole of the substrate used for the core substrate of a printed wiring board or the like. A shank 2 gripped by a chuck or the like of a machine tool, and a drill body 3 arranged on the same axis as the shank 2 and integrally coupled to the shank 2. The drill body 3 has a cutting edge portion 4 on the tip side of the drill and a neck portion 5 having a diameter smaller than that of the cutting edge portion 4 connected to the base end of the cutting edge portion 4, and is an undercut type. ..

刃先部４の先端付近の最大径部の外径は例えば０．１５ｍｍとされ、刃先部４はその最大径部から刃先部４の基端に向けて例えば角度θ＝１～２０°で縮径しており、ネック部５の外径は例えば０．１４ｍｍとされている。また、刃先部４は、通常のドリルにおけると同様に、ドリル回転方向Ｔの前方に向く切刃６を有している。 The outer diameter of the maximum diameter portion near the tip of the cutting edge portion 4 is, for example, 0.15 mm, and the cutting edge portion 4 is reduced in diameter from the maximum diameter portion toward the base end of the cutting edge portion 4, for example, at an angle θ = 1 to 20 °. The outer diameter of the neck portion 5 is set to, for example, 0.14 mm. Further, the cutting edge portion 4 has a cutting edge 6 facing forward in the drill rotation direction T, as in a normal drill.

ドリル本体３は切屑排出用に、刃先部４の先端からネック部５にかけて所定のねじれ角で螺旋状に形成された１条のみの主溝７と、刃先部４の先端から主溝７に沿って刃先部４のみに形成された副溝８とを有しており、副溝８は、刃先部４の、ネック部５に繋がる部分１０で主溝７の途中に合流して終了している。 The drill body 3 has only one main groove 7 formed spirally with a predetermined helix angle from the tip of the cutting edge portion 4 to the neck portion 5 for chip discharge, and the drill body 3 is formed along the main groove 7 from the tip of the cutting edge portion 4. It has a sub-groove 8 formed only in the cutting edge portion 4, and the sub-groove 8 ends at a portion 10 of the cutting edge portion 4 connected to the neck portion 5 and joins in the middle of the main groove 7. ..

刃先部４は、通常のドリルにおけると同様に、先端逃げ面９を有している。先端逃げ面９は、図示例では単一面状であるが、軸線Ｏに対し周方向に並んだ多段面状でもよい。また、刃先部４の、ネック部５に繋がる部分１０は、孔明け加工中の応力集中を緩和するためにフィレット形状（Ｒ形状）を有していてもよい。 The cutting edge portion 4 has a tip flank surface 9 as in a normal drill. The tip flank surface 9 has a single surface shape in the illustrated example, but may have a multi-step surface shape arranged in the circumferential direction with respect to the axis O. Further, the portion 10 of the cutting edge portion 4 connected to the neck portion 5 may have a fillet shape (R shape) in order to alleviate stress concentration during drilling.

この実施形態の基板の貫通孔充填磁性体用ドリルによれば、主溝７を１条のみとするとともに副溝８を刃先部４のみに設けて主溝７の途中に合流させることで従来のドリルよりも剛性が高められているので、プリント配線板のコア基板等に用いられる基板の貫通孔内に充填されたフェライト等の磁性体にさらに貫通孔を形成する孔明け加工に用いても、長寿命と高い孔位置精度とを達成することができる。 According to the drill for a magnetic material for filling a through hole of a substrate of this embodiment, the main groove 7 is provided only in one groove, and the sub-groove 8 is provided only in the cutting edge portion 4 so as to join in the middle of the main groove 7. Since it has higher rigidity than a drill, it can be used for drilling to further form through holes in a magnetic material such as ferrite filled in the through holes of a substrate used for a core substrate of a printed wiring board. A long life and high hole position accuracy can be achieved.

しかも、刃先部４がその先端付近の最大径部から刃先部４の基端に向けて縮径していて、その刃先部４の最大径部から基端までのいわゆるマージン部が軸線Ｏに向かってバックテーパ状に逃げていることから、基板の貫通孔内に充填された磁性体への貫通孔の穴あけの際に、ドリルで明けた孔の内壁面とドリル外周面とが、従来のように面接触するのでなくその最大径部において線接触するので、デスミアできない材料である磁性体へのスミアの発生を抑制することができる。 Moreover, the cutting edge portion 4 has a reduced diameter from the maximum diameter portion near the tip thereof toward the base end of the cutting edge portion 4 , and the so-called margin portion from the maximum diameter portion to the base end of the cutting edge portion 4 faces the axis O. Since it escapes in a back taper shape, the inner wall surface of the hole drilled by the drill and the outer peripheral surface of the drill are as in the conventional case when drilling the through hole in the magnetic material filled in the through hole of the substrate. Since it does not make surface contact with the surface but makes line contact at its maximum diameter, it is possible to suppress the generation of smear on a magnetic material that cannot be desmeared.

１ 基板の貫通孔充填磁性体用ドリル
２ シャンク
３ ドリル本体
４ 刃先部
５ ネック部
６ 切刃
７ 主溝
８ 副溝
９ 先端逃げ面
１０ ネック部に繋がる部分
Ｏ 軸線 1 Drill for magnetic material that fills through holes in the board 2 Shank 3 Drill body 4 Cutting edge 5 Neck 6 Cutting edge 7 Main groove 8 Sub-groove 9 Tip flank 10 Part connected to neck O-axis

Claims (2)

基板の貫通孔内に充填された磁性体にさらに貫通孔を形成するための基板の貫通孔充填磁性体用ドリルであって、
ドリル先端側の刃先部と、
前記刃先部の基端に繋がる、その刃先部よりも小径のネック部と、
前記刃先部の先端から前記ネック部にかけて螺旋状に形成された１条の主溝と、
前記刃先部の先端から前記ネック部に繋がる部分まで前記主溝に沿って前記刃先部のみに形成された副溝と、を備え、
前記刃先部がその先端付近の最大径部から基端に向けて縮径しており、かつ、前記刃先部が前記ネック部に繋がる部分にフィレット形状を有している。 A drill for a magnetic material filled with a through hole in a substrate for further forming a through hole in the magnetic material filled in the through hole of the substrate.
The cutting edge on the tip side of the drill and
A neck portion connected to the base end of the cutting edge portion and having a diameter smaller than that of the cutting edge portion,
A single main groove formed spirally from the tip of the cutting edge portion to the neck portion, and
A sub-groove formed only in the cutting edge portion along the main groove from the tip of the cutting edge portion to the portion connected to the neck portion is provided.
The cutting edge portion has a reduced diameter from the maximum diameter portion near the tip thereof toward the base end , and has a fillet shape at a portion where the cutting edge portion is connected to the neck portion . 請求項１記載の基板の貫通孔充填磁性体用ドリルであって、
前記刃先部の最大径部から基端に向けて縮径する角度は１°～２０°である。 The drill for a magnetic material for filling a through hole in a substrate according to claim 1.
The angle at which the diameter is reduced from the maximum diameter portion of the cutting edge portion toward the base end is 1 ° to 20 °.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004082318A (en) 2002-07-02 2004-03-18 Mitsubishi Materials Corp Drill
JP2004082248A (en) 2002-08-26 2004-03-18 Mitsubishi Materials Corp Compact drill

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184926A (en) * 1990-11-05 1993-02-09 Megatool, Inc. Root-strength drill bit and method of making
JPH05167262A (en) * 1991-12-13 1993-07-02 Matsushita Electric Ind Co Ltd Ceramic multilayer wiring board and manufacture thereof
JPH0737532U (en) * 1993-12-14 1995-07-11 三菱マテリアル株式会社 Hole processing tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004082318A (en) 2002-07-02 2004-03-18 Mitsubishi Materials Corp Drill
JP2004082248A (en) 2002-08-26 2004-03-18 Mitsubishi Materials Corp Compact drill

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