JPH03245908A - Twist drill and manufacture thereof - Google Patents
Twist drill and manufacture thereofInfo
- Publication number
- JPH03245908A JPH03245908A JP3931790A JP3931790A JPH03245908A JP H03245908 A JPH03245908 A JP H03245908A JP 3931790 A JP3931790 A JP 3931790A JP 3931790 A JP3931790 A JP 3931790A JP H03245908 A JPH03245908 A JP H03245908A
- Authority
- JP
- Japan
- Prior art keywords
- drill
- angle
- groove
- tip
- twist drill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 238000007664 blowing Methods 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 239000000758 substrate Substances 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 14
- 238000003754 machining Methods 0.000 description 12
- 238000005452 bending Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- 229930091051 Arenine Natural products 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
Landscapes
- Drilling Tools (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は基板の穴明に用いる高アスペクト用ステップ加
工に最適なドリル及びその製造方法に間する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a drill that is most suitable for high aspect step machining used for drilling holes in substrates, and a method for manufacturing the same.
［従来の技術］
従来の基板の穴明装置の穴明部は第１１図に示すように
高速で回転するスピンドル１０でドリル３を把持し、前
記ドリル３の周辺をバッド２１で押えて穴明していた。[Prior Art] As shown in FIG. 11, the drilling section of a conventional substrate drilling device grips a drill 3 with a spindle 10 that rotates at high speed, and presses the periphery of the drill 3 with a pad 21 to drill the hole. Was.
そして前記バッド２１の先端面には放射状に溝２３を形
成し、かつバッド２１を集塵用バキュームＨＨＣ図示せ
ず）で低圧化して外部との圧力差により前述の溝から外
気を流入させて外気の液入による気流によって、穴明に
よって生じた切粉を集塵していた。しかし、バキューム
方式では前述の外部との圧力差は最大でも１気圧であり
、必ずしも集塵に必要な′Ｊｌ遼が得られず、特にドリ
ル３の溝に硬く詰った切粉は除去されない。このため加
工された穴の内！面の絹ざが大きくなりスミアが発生し
穴内面の品質が低下した。Grooves 23 are formed radially on the tip surface of the pad 21, and the pressure of the pad 21 is lowered by a dust collecting vacuum (HHC (not shown)) to allow outside air to flow in through the grooves due to the pressure difference with the outside. The airflow generated by the liquid was used to collect chips generated during drilling. However, in the vacuum method, the pressure difference with the outside is 1 atm at maximum, and the pressure required for dust collection cannot necessarily be obtained, and in particular, the chips that are hard in the groove of the drill 3 cannot be removed. Inside the hole machined for this purpose! The surface wrinkles became large, smear occurred, and the quality of the inner surface of the hole deteriorated.
第１５図に示すエアジェツト方法は前述したドリル３の
溝の切粉残りの解消を目的に考案されたものでバッド２
１？こ高圧のエアを導いてバッド２１内部に吹き出させ
ることによりドリル３に当るエアの流通を高め強制的に
ドリル３を冷却しながら溝に硬く詰った切粉を確実に除
去する。同時に穴明部から排出される切粉をもスムーズ
に除去するようにしたものである。The air jet method shown in FIG.
1? By guiding this high-pressure air and blowing it out inside the pad 21, the circulation of the air hitting the drill 3 is increased, and while the drill 3 is forcibly cooled, the chips hardened in the groove are reliably removed. At the same time, chips discharged from the hole are also smoothly removed.
一般に穴明加工において、切粉（よアスペクト比が８以
上になるとドリル溝から排出されにくくなる。そして、
切粉の流れが悪くなると、切粉がドリルの溝内にたまり
、ざらにドリル先端で発生する切粉が押し込まれること
により、溝内で硬く詰る。すると、加工された穴の内面
と切粉が接触し、第１８図に示すように、負荷の増加値
１でへ内壁絹ざが大きくなりスミアの発生も多くなった
。Generally, during drilling, chips (if the aspect ratio is 8 or more, it becomes difficult to discharge from the drill groove.
When the flow of chips becomes poor, the chips accumulate in the groove of the drill, and the chips generated at the tip of the drill are pushed in and become hard and clogged in the groove. Then, the chips came into contact with the inner surface of the machined hole, and as shown in FIG. 18, when the load was increased by 1, the inner wall creases became larger and smear occurred more frequently.
また切粉詰つによってドリルのスラスト賃荀が増加しド
リルが穴の連山で曲げられ、基板の裏側の穴位置精度が
悪くなったつ、座屈してドリル折れを起すことがあった
。In addition, the thrust force of the drill increases due to chip clogging, causing the drill to bend due to a series of holes, resulting in poor hole positioning accuracy on the back side of the board, which may cause buckling and breakage of the drill.
罵１４図に示すステップ加工方法はこれら切粉詰りの解
、肖を目的ｆこしたもので、１つの穴を切粉詰つを起さ
ない切込量で連続的に何回かに分けて穴明し、毎回ドリ
ル溝に詰った切粉をスムーズに除去しながら穴明てきる
ようｌこ工夫してる。The step machining method shown in Fig. 14 is aimed at solving these chip clogging problems, and involves continuously dividing one hole into several steps at a depth of cut that does not cause chip clogging. Every time I drill a hole, I try to remove the chips that are stuck in the drill groove smoothly.
罵１９図〜第２１図は従来の穴明機に使用されていた高
アスペクト用ドリルで次のような形状をしていた。Figures 19 to 21 show high aspect drills used in conventional drilling machines, which had the following shapes.
例えば、直径０．４ｍｓのドリルでは芯厚をドリル径の
約１５％、溝巾比を約２．０．芯厚テーパを１．５〜２
．０／＋００．ねじれ角を３０６３５°、材質に３０の
ような仕様で形成されていたが、その長さは一定ｊこ形
成されているため、ボディ畏、フルート畏は基板の板厚
に対して畏すぎたつまた短すぎたつした。また、切粉詰
まりを起ざないように罵２１図のように外周に逃げを０
゜０５Ｉｌｖ（通常の２倍）とったものがあった。この
ため、ドリルの強度が低下してドリル折れが多くなった
り、穴位１精度、穴品質を低下させることがあった。For example, for a drill with a diameter of 0.4 ms, the core thickness is approximately 15% of the drill diameter and the groove width ratio is approximately 2.0. Core thickness taper 1.5-2
．． 0/+00. It was formed with a helix angle of 30,635 degrees and a material of 30, but because the length was constant, the body and flute were too thick for the thickness of the board. It was too short. Also, in order to prevent chip clogging, there is no relief on the outer periphery as shown in Figure 21.
There was one that took ゜05Ilv (twice the normal amount). For this reason, the strength of the drill may be reduced, resulting in more drill breakage, and the hole position accuracy and hole quality may be reduced.
このようなドリルをステップ加工に使用した場合、トリ
ル断面２次モーメントの分布が罵１９図のモデル図のよ
うに先＃側と根本側とで差が少ないため、穴明機のテー
ブル位置決め債の残留撮動、スピンドルの振れ、ドリル
ポイント他の製作誤差、当板及び基板表面の凹凸、基板
のガラス繊維束の切削抵抗、またドリル溝が切粉詰り状
態て回転した場合の遠心力等によるラジアル方法荷重が
矢印方向にかかった場合、８部で図のようにまげられる
。そして、ドリル先端のたわみｙ、ζより部の最小断面
２次モーメントの大きざ及びＢ部の数に反比例する。つ
まり、同一長さのドリルではＢ部の最小断面２次モーメ
ントが小さいほど、またＢａ１ｌの数が多いほどたわみ
ｙ、は大きくなる。そして、ｙ、が弾性限界を超えた場
合、永久歪が起り、ドリルが根本て曲った。このため、
このようなドリルで板厚０．７ｍｍの基板を３枚重ねて
加工した場合、基板表面の穴位置精度が悪くなるだけで
なく３枚目の穴位置ずれが大きくなるために、穴が導体
ランドからはみ出して２ｌ通不良の原因になった。When such a drill is used for step machining, there is little difference in the distribution of the second moment of inertia of the drill cross section between the tip # side and the root side, as shown in the model diagram in Figure 19. Radial damage due to residual imaging, spindle runout, manufacturing errors in drill points, etc., unevenness on the surface of the contact plate and substrate, cutting resistance of the glass fiber bundle on the substrate, and centrifugal force when rotating with the drill groove clogged with chips. When a load is applied in the direction of the arrow, 8 parts are bent as shown in the figure. The deflection y of the tip of the drill is inversely proportional to the size of the minimum moment of inertia of the ζ twist portion and the number of B portions. In other words, for drills of the same length, the smaller the minimum moment of inertia of section B and the larger the number of Ba1l, the larger the deflection y. When y exceeds the elastic limit, permanent deformation occurs and the drill is fundamentally bent. For this reason,
When machining three boards with a thickness of 0.7 mm using a drill like this, not only does the hole position accuracy on the board surface deteriorate, but also the positional deviation of the third hole becomes large, causing the holes to overlap conductor lands. It protruded from the wall and caused a 2L failure.
また、最初の切込工程であけた穴の入口が２度目以降の
切込工程できずつ１すられるなどのＩｌ！Ｉ１Ｍがあり
実用化できなかった。In addition, the entrance of the hole drilled in the first cutting process may be closed by 1 in the second and subsequent cutting processes. Due to I1M, it could not be put into practical use.
第７図り、巳は前述のドリルのドリル先端の曲げ負荷と
たわみとの関係を示す。Figure 7 shows the relationship between bending load and deflection of the tip of the drill described above.
蒐８図り、Ｅは同上ドリルで基板を３枚重ねで穴明した
場合の３枚目の穴位置精度を示す。Figure 8 shows the hole position accuracy for the third board when holes are drilled in three boards stacked with the same drill as above.
さらに、ドリルの強度マージンが小さいため、厚い内層
Ｃｕ箔を加工する最に切込量及び切込速度を増やすとド
リルが折れ易く、また、前述のようにドリルが曲げられ
た状態で回転した場合、ドリルの外周と穴壁面との間で
！１１撞力が生じ、ドリルが途中で撚り破壊し易いだけ
でなく、穴の内壁粗さが大きくなり、加工部の温度が上
るため内層Ｃｕ箔上にスミアが発生するなど人品質向上
の問題があった。Furthermore, since the strength margin of the drill is small, if the depth of cut and cutting speed are increased when processing a thick inner layer Cu foil, the drill is likely to break, and as mentioned above, if the drill is rotated in a bent state, , between the drill periphery and the hole wall! 11 Twisting force is generated, which not only makes it easy for the drill to twist and break in the middle, but also increases the roughness of the inner wall of the hole and increases the temperature of the machined part, causing problems in improving the quality of work, such as smearing on the inner layer Cu foil. there were.
［発明が解決しようとする課題］
従来の小径高アスペクト穴加工用のドリルは前述のよう
なドリル形状とドリル折れ、穴位置精度、穴品質及び加
工速度などとの要因について殆ど配慮されていなかった
ため、穴明の信頼性が低く、加工品の歩留りが悪く、か
つ主産牲が悪いなどの問題があ−）た。[Problem to be solved by the invention] Conventional drills for drilling small-diameter, high-aspect holes have had little consideration given to the aforementioned factors such as drill shape, drill breakage, hole position accuracy, hole quality, and processing speed. There were problems such as low reliability of hole drilling, poor yield of processed products, and poor main productivity.
本発明の目的はドリルの形状を最適化し前記問題点を解
決することにある。An object of the present invention is to optimize the shape of a drill to solve the above-mentioned problems.
［課題を解決するための手段］
前記目的を解決するために、ステップ加工でのドリルの
先端形状と途中の溝形状を最適化した。[Means for solving the problem] In order to solve the above object, the shape of the tip of the drill and the shape of the groove in the middle of the step machining were optimized.
［作 用］
最初の最適切込量をドリル径りの４〜６倍、２番目の最
適切込量を２〜３倍、３１目以降の最適切込量を１．５
〜３倍に決めてから、ドリルの芯厚、溝ロ比、先端角、
切刃２８角、３醤角、溝ねじれ角からドリルの先端形状
を決め、溝断面積から途中及び終端の芯厚を決めた。[Effect] The first optimum depth is 4 to 6 times the drill diameter, the second optimum depth is 2 to 3 times, and the optimum depth after 31st is 1.5.
After deciding on ~3 times, the core thickness of the drill, groove ratio, tip angle,
The tip shape of the drill was determined from the 28-square cutting edge, the 3-edge angle, and the groove helix angle, and the core thickness at the middle and end was determined from the groove cross-sectional area.
そして、ドリルの芯厚を先端側て小ざく、根本側で大き
くして、ドリル先端のたわみｙ、をできるだけ小さくし
た。The core thickness of the drill was made smaller on the tip side and larger on the base side to minimize the deflection y at the tip of the drill.
また、前述のドリルに最適な外周逃げ及びボディ長を決
め前述の効果を一層高めた。In addition, we determined the optimal outer circumference relief and body length for the aforementioned drill, further enhancing the aforementioned effects.
これにより３枚重ねの基板をステップ加工て加工した場
合の３枚目の穴位置精度を向上し、穴の導体ランドから
の喰出しをなくした。また、ドリル折れをなくした。さ
らに、穴入口の傷の発生。This improves the accuracy of the hole position on the third board when three boards are stacked in steps and eliminates the hole protrusion from the conductor land. It also eliminates drill breakage. Furthermore, the occurrence of scratches at the hole entrance.
穴内壁粗さ及び内層Ｃｕ箔上のスミアの発生などを解決
して３枚重ね加工を実現した。We solved problems such as the roughness of the inner wall of the hole and the occurrence of smear on the inner layer Cu foil, and realized three-layer processing.
［実施例］ 以下本発明の１実施例について説明する。[Example] One embodiment of the present invention will be described below.
第１３図は、本発明のドリルを通用する装置の１例を示
すもので、同図において１０１は穴明装厘のベツド、１
０２はテーブルでベツド１０】に矢印Ｘ方向に移動可能
に支持されている。FIG. 13 shows an example of a device that can be used with the drill of the present invention.
A table 02 is supported on the bed 10 so as to be movable in the direction of the arrow X.
１０３はコラムヘッド１０１にテーブル１０２をまたぐ
ように固定されている。１０４はスピンドルキャリジで
コラム１０３に矢印Ｙ方向に移動可能に支持されている
。＋０５は加工ヘッドでスピンドルキャリジ１０４に矢
印２方向に移動可能に支持されており、ドリル＋０８を
把持してテーブル＋０２上のプリント基板＋０９’！！
加工するスピンドル＋０８が固定されている。103 is fixed to the column head 101 so as to straddle the table 102. A spindle carriage 104 is supported by the column 103 so as to be movable in the direction of arrow Y. +05 is a processing head supported by the spindle carriage 104 so as to be movable in the two directions of the arrows, and grips the drill +08 to cut the printed circuit board +09'! on the table +02. !
The processing spindle +08 is fixed.
１０７は加工ヘッド１０５に２方向に移動可能に支持さ
れたプレッシャフットである。A pressure foot 107 is supported by the processing head 105 so as to be movable in two directions.
穴明工程では先ずテーブル１ｏ２．スピンドルキャリジ
１０４が移動してスピンドル１０６のドリル１０８がプ
リント基板１０９に対して位１決めされると、加工ヘッ
ド１０５が加工してプレッシャフット１０７がプリント
基板１０９を押える。以（ｋ第１４図に示すステップ加
工工程図に従って最初の切込量１１Ｍ、まで穴明される
。次に工程■でドリルが穴の外に９だ（丈引き出され切
粉がふり払われた後改めて２番目の切込位置Ｍ、まて穴
明され、以債切込位ＷＢを経て■で一工程が終了する。In the drilling process, first the table 1o2. When the spindle carriage 104 moves and the drill 108 of the spindle 106 is positioned with respect to the printed circuit board 109, the processing head 105 processes and the pressure foot 107 presses the printed circuit board 109. According to the step machining process diagram shown in Figure 14, the hole is drilled to the initial depth of cut of 11M.Next, in step 2, the drill is pulled out to the outside of the hole (the length is pulled out and the chips are shaken off). After that, the hole is drilled again at the second cutting position M, and after passing through the second cutting position WB, one process is completed at ■.
第１５図はエアジェツト方式の７レシヤフツト１６によ
る切粉の排出状況を示す。高圧のエアをトリル３の回転
方向ＣＷと反対方向から吹きつけトリル溝に沿った高速
の空気の流れによって第１６区に示すように穴明中の切
粉の排出効果を高め、かつ！１６図に示すようにドリル
３が穴から引き出された場合ドリル溝に詰った切粉を確
実に除去する９カ果がある。FIG. 15 shows the state of discharge of chips by the air jet type 7-reshaft 16. High-pressure air is blown from the direction opposite to the rotating direction CW of the trill 3, and the high-speed air flow along the trill groove enhances the effect of discharging chips during drilling, as shown in section 16, and! As shown in Fig. 16, there are nine ways to reliably remove chips stuck in the drill groove when the drill 3 is pulled out of the hole.
篤１図〜第４０は、本発明の高アスペクト比穴加工用ド
リルの１例の詳細を示す。Figures 1 to 40 show details of one example of the drill for drilling high aspect ratio holes of the present invention.
即ち、ドリル径が０．４ｍｍ、芯厚がドリルｉ径の１５
％、溝巾比が２．０．先端角が１３０１切刃２番角が２
０°、３番角が３０’°、ねじれ角が３２°、ボディ長
６．５ｍｓ、外周逃げ０゜０２５ｍ５．材質がに２０又
はに１０材、ボディエンドから溝許曙部までの間に畏さ
０．２５ｍ＠の溝のない部分を設け、テーパエンドに相
当する部分の溝断面積がボディ断面積の約２０％となる
芯厚テーパとした。That is, the drill diameter is 0.4 mm, and the core thickness is 15 mm of the drill i diameter.
%, groove width ratio is 2.0. Tip angle is 1301, cutting edge 2nd angle is 2
0°, 3rd angle is 30'°, helix angle is 32°, body length is 6.5ms, circumference clearance is 0°025m5. The material is 20 or 10, and a 0.25m non-grooved part is provided between the body end and the groove end, and the groove cross-sectional area of the part corresponding to the tapered end is approximately 20% of the body cross-sectional area. The core thickness is tapered.
前記ドリルでステップ加工方法で板厚１．６１の基板を
３枚重ねて加工する場合、最初の切込量をドリル径Ｑ、
４ａ＋ｍの約５倍の２ｍｍ、２壜目の切込量を約２．５
倍の＋ｆｍ、３番目以降の切込量を約２倍の０．８ａｖ
にすればドリル折れかなく穴位置精度及び人品質の良好
な穴明結果が得られる。When machining three boards with a thickness of 1.61 in a stack using the step machining method using the drill, the initial depth of cut is set to the drill diameter Q,
2mm, which is about 5 times the size of 4a+m, and the depth of cut for the second bottle is about 2.5
Double +fm, approximately double the depth of cut from the 3rd onward to 0.8av
If you do this, you can obtain hole drilling results with good hole position accuracy and human quality without the drill breaking.
即ち、上記ドリルは第５図のモデル図に示すように芯厚
を先端側で小ざく、根本側に向って急激に増したことに
よって最小断面２次モーメント部Ｂと最大断面２次モー
メント部Ａの強度９合成が増すので矢印方向の力が加わ
ってもたわみｙ（よ小ざい、また、各切込量を制約した
ことによって途中から溝の断面積が小さくなっても各ス
トロークでの穴明中及びドリルが穴から引き出された場
合の切粉の排出は蒐６図に示すように確実に行われる。That is, as shown in the model diagram of FIG. 5, the drill has a core thickness that is small at the tip and increases rapidly toward the base, resulting in a minimum area of second moment of area B and a maximum area of second moment of area A. Since the strength 9 resultant increases, even if a force in the direction of the arrow is applied, the deflection y (y) will be small.Also, by restricting each depth of cut, even if the cross-sectional area of the groove becomes smaller from the middle, the hole drilling at each stroke will be smaller. When the drill and the drill are pulled out of the hole, the discharge of chips is ensured as shown in Figure 6.
篤７図Ａは前述の本発明のドリルのドリル先端の曲げ負
荷とたわみの間係を示す。Figure 7A shows the relationship between bending load and deflection of the tip of the drill of the present invention.
篤８図Ａは同上ドリルで基板を３枚重ねて穴明した場合
の３枚目の穴位置精度と加工穴数の関係を示す。Figure A of Atsushi 8 shows the relationship between the hole position accuracy and the number of holes drilled in the third board when holes are drilled in three boards stacked with the same drill as above.
前述の例では、溝形状をストレートの芯厚テーパとして
決めたが、第９図のように複数のテーパを複合したもの
、また、製作時にドリルの回転送り角度及び軸方向送り
に対して円板式のドリルの研削砥石値Ｍをドリルの細心
に対して
ｙ＝ａｘ’ ＋ｂ、Ｙ＝ａｘ’ ＋ｂ
のようにフントロールして笥１０図のように先端からテ
ーパエンドに相当する位置まで連続的に変化させたもの
である。In the above example, the groove shape was determined to be a straight taper with a core thickness, but as shown in Figure 9, it may be a combination of multiple tapers, or a disc type groove shape for the rotational feed angle and axial feed of the drill during manufacturing. The grinding wheel value M of the drill is continuously changed from the tip to the position corresponding to the taper end as shown in Figure 10 by rolling the grinding wheel value M of the drill as follows: y = ax' + b, Y = ax' + b This is what I did.
また、溝のねじれ角については、菓１１図に示すように
先端の溝角を２４″にした場合、同じ畏ざのドリルでも
最小断面２次モーメント部Ｂの数から５聞所から４箇所
に滅るためのドリルの合成が増加するのでたわみｙが小
さくなつ穴位置精度は向上する。しかし円周方向の切削
負匂が増加するためドリルの摩耗がやや早いため両面板
に通している。Regarding the torsion angle of the groove, if the groove angle at the tip is set to 24'' as shown in Figure 11, even with the same drill, the twist angle will change from 5 points to 4 points based on the number of the minimum cross-sectional moment of inertia part B. Since the amount of the drill to be destroyed increases, the deflection y becomes smaller and the hole position accuracy improves.However, the cutting noise in the circumferential direction increases and the drill wears out rather quickly, so it is passed through a double-sided plate.
藁７図Ｂは上記ドリルのドリル先端の曲げ負荷とたわみ
の関係を示す。Figure B shows the relationship between the bending load and deflection of the tip of the drill.
篤８図Ｂは同上ドリルで基板３枚重ねで穴明した場合の
３枚目の穴位置精度と加工大数の関係を示す。Figure 8B shows the relationship between the accuracy of the hole position on the third board and the number of holes to be processed when drilling holes in three boards stacked with the same drill as above.
ざらに、Ｍ１２図は前述の欠点を補うために溝のねじれ
角をドリルの先端側で３２°、根本側で２０”にしたも
ので製作時に研削砥石の角度とドリルの回転送つ角度に
対してドリルの軸方向送りをｙ＝ａｘ” ＋ｂのように
フントロールして連続的に変化させたものである。Roughly speaking, the M12 diagram has the helix angle of the groove set to 32 degrees on the tip side of the drill and 20" on the base side in order to compensate for the above-mentioned drawbacks. The axial feed of the drill is continuously changed by performing a feed roll as shown in y=ax"+b.
蔦７図Ｃは上記ドリルのドリル先端の曲げ負荷とたわみ
の間係を示す。Figure 7C shows the relationship between bending load and deflection of the tip of the drill.
第８図Ｃは同上ドリルで基板３枚重ねで穴明した場合の
３枚目の穴位置精度と加工大数の関係を示す。FIG. 8C shows the relationship between the hole position accuracy of the third board and the number of holes to be processed when holes are drilled in three boards stacked with the same drill as above.
穴明中のドリルのスラスト負荷は、先端角とねじれ角（
切刃１番角）による切削分力とチゼル長を直径とする円
面積分のチゼル部押圧力からなる。The thrust load of the drill during drilling is determined by the tip angle and helix angle (
It consists of the cutting force due to the cutting edge (the first corner) and the pressing force on the chisel part due to the circular area with the chisel length as the diameter.
先端角、切刃２番角、３１角を太きくとりすぎチゼル長
がドリル直径の４０％近くに達すると、穴明時に、ドリ
ルに加わるスラスト負荷が大きくなる。このため切込速
度を上げると多層板加工の際にドリルが座屈して折れた
り、Ｒ１１！！熱により内層Ｃｕｉと樹脂が剥１１Ｔる
。また、切刃長が短くなるため、加工された穴の内壁が
粗くなったり、スミアの発王が多くなる。If the tip angle, cutting edge No. 2 angle, and No. 31 angle are made too thick and the chisel length reaches nearly 40% of the drill diameter, the thrust load applied to the drill during drilling will increase. For this reason, if the cutting speed is increased, the drill may buckle and break when machining multilayer plates, or R11! ! The inner layer Cui and the resin peel off 11T due to the heat. In addition, since the cutting edge length becomes short, the inner wall of the machined hole becomes rough and smear occurs more often.
しかし、ラジアル方向の分力が小さくなるため穴付１精
度は改善される傾向にある。However, since the component force in the radial direction becomes smaller, the accuracy of hole making tends to improve.
一方、これと逆に先端角、切刃、２番角、３番角を小さ
くし過ぎると前述の間！！１よなくなるが、穴位置精度
は悪くなる傾向にある。On the other hand, if you make the tip angle, cutting edge, 2nd angle, and 3rd angle too small, the result will be between the points mentioned above! ! 1, but the hole position accuracy tends to deteriorate.
従って、ドリル径０．３ｓｍ〜０．５ｍｓのドリルでの
最適な芯厚はドリル直径の１０〜２８％、溝巾比は１．
２〜２．５．先端角は１１８゜１４０°、切刃２番角が
１５＠〜２０°、３番角が２５″″〜３０＠、ねじれ角
が２０＠〜３５′″が最適である。Therefore, the optimum core thickness for a drill with a drill diameter of 0.3 sm to 0.5 ms is 10 to 28% of the drill diameter, and the groove width ratio is 1.
2-2.5. The optimal tip angle is 118° to 140°, the second cutting edge angle is 15° to 20°, the third angle is 25″″ to 30°, and the helix angle is 20° to 35″.
［発明の効果］
本発明によれば、ステップ加工とエアジェツト式の切粉
除去機能を備えた穴明機に最適な罵アスペクト比穴加工
用ドリルが実用化できるので、小径の高アスペクト穴加
工の１１！頼牲が向上し、穴位置精度の良い、高品質穴
を高能率に得ることができる。[Effects of the Invention] According to the present invention, it is possible to put into practical use a drill for drilling holes with a poor aspect ratio, which is ideal for a drilling machine equipped with step processing and an air jet type chip removal function, so that it is possible to put into practical use a drill for drilling small-diameter, high-aspect ratio holes. 11! Reliability is improved, and high-quality holes with good hole position accuracy can be obtained with high efficiency.
また、小径化によってプリント基板の配線！！！度（ｃ
ｈａｎｅｌ／９ｒｉｄ）を従来の°〜２本から３〜５本
に向上でき、かつ、内層数、板厚を大幅（６０層、８０
＋ｎｍ）に向上できるので高密度基板の製造が可能にな
る。Also, the wiring of printed circuit boards can be improved by reducing the diameter! ! ! degree (c
hanel/9rid) from the conventional °~2 to 3~5, and the number of inner layers and board thickness can be significantly increased (60 layers, 80 layers).
+nm), making it possible to manufacture high-density substrates.
このため、大型コンピュータを始めとする電子機器の処
理速度、耐ノイズマージンが大幅に向上し高性能化が可
能となり、かつ、装置の小型化が可能となるなど工業上
極めで有利となるなどの効果がある。For this reason, the processing speed and noise resistance margin of electronic equipment such as large computers have been greatly improved, making it possible to achieve higher performance, and it has also become possible to miniaturize the equipment, which is extremely advantageous in industrial terms. effective.
罵１図（よ本発明のドリルの正面図、罵２のは罵１図の
底面図、篤３図は本発明のドリルの先端の拡大図、第４
図は第３図の角度を変えた拡大図、第５［Ｆ］は本発明
のドリルに負荷がかかったときのたわみを示Ｖ特性図、
′Ｍ６図はドリルによるステップ加工の工程図、！７図
はドリル先端の曲げ負荷とたわみの間係を示す特性図、
篤８図は穴開二数と穴位置精度の関係を示す特性図、罵
９図。
菓１０図はドリルの芯厚の形状を示す説明図、篤１１図
は罵５区のねじれ角を小さくした場合のドリルに！荷が
かかったときのたわみを示Ｔ＃！性図、第１２図は第５
図のねじれ角を先端と根本部とを変えた場合のドリルに
負荷がかかったどきのたわみを示Ｔ特性図、第１３図は
プリント基板穴明機の斜視図、第１４図Ａｔよ従来のス
テップ加工方法を示す特性図、第１４図Ｂは従来のステ
ップ加工方法を示す工程図、第１５図Ａはエアジェツト
方式のプレッシャフトの正面断面図、第１５図Ｂは第１
５図Ａの使用状態を示す正面断面口、第１５１２Ｃは第
１５図Ａのパッド部分を示す正面断面図、第１５図りは
第１５図Ａの底面図、禦１６図Ａは篤１５図Ｂにおける
エアの潰れを示す拡大図、第１６図８１ｃｔ薗１５■Ｃ
のエアの流れを示す拡大図、第１４図Ａ１蔦１１図Ｂは
通常のプレッシャフトの使用状ａを示す正面断面図、蔦
１１図Ｃは第１１図への状態のときのエアの流れを示す
拡大図、蔦１１図りは篤１１図Ｂの状態のときのエアの
流れを示す拡大図、罵１８図Ａはドリルにかかるスラス
ト方向の荷重と穴の深さとの間係を示す特性図、篤１８
図Ｂ、篤１８図Ｃは藁１８図Ａで加工された基板の大表
面を示す断面写真、ｊ＊１９図は従来のドリルに負荷が
かかったときのたわみを示す特性図、藁２ｏ図は従来の
ドリルの先端の形状を示す拡大図、第２１図は従来の他
のドリルの先端の形状を示す拡大図である。
０１・・・ベツド １０２・・・テーブル０３・・・
コラム １０４・・・スピンドルキャリジｏ５・・・
加工ヘッド １０６・・・スピンドル０７・・・プレ
ッシャフト １０８・・・ドリル０９・・・プリント
基板
特許８順人 日立精工株式会社Figure 1 is a front view of the drill of the present invention, Figure 2 is a bottom view of Figure 1, Figure 3 is an enlarged view of the tip of the drill of the present invention, and Figure 4 is a bottom view of the drill of the present invention.
The figure is an enlarged view of Fig. 3 at a different angle, and Fig. 5 [F] is a V characteristic diagram showing the deflection when a load is applied to the drill of the present invention.
'Diagram M6 is a process diagram of step machining using a drill! Figure 7 is a characteristic diagram showing the relationship between bending load and deflection of the drill tip.
Figure 8 is a characteristic diagram showing the relationship between the number of holes drilled and hole position accuracy, Figure 9 is Figure 9. Figure 10 is an explanatory diagram showing the shape of the core thickness of the drill, and Figure 11 is the drill when the helix angle of the 5th section is made smaller! Indicates the deflection when a load is applied T#! Sex chart, figure 12 is the 5th
Figure 13 is a perspective view of a printed circuit board drilling machine, Figure 14 is a conventional Characteristic diagram showing the step machining method, Fig. 14B is a process diagram showing the conventional step machining method, Fig. 15A is a front sectional view of the air jet type preshaft, Fig. 15B is the first
1512C is a front sectional view showing the pad part in FIG. 15A, FIG. 15 is a bottom view of FIG. 15A, and FIG. Enlarged view showing air collapse, Fig. 16 81ct Sono 15■C
Figure 14 A1 is an enlarged view showing the air flow in Figure 14. Figure 11 B is a front cross-sectional view showing the normal pre-shaft usage condition a. Figure 11 C is the air flow in the state shown in Figure 11. The enlarged view shown in Figure 11 is an enlarged view showing the air flow in the state shown in Figure 11B, and Figure 18A is a characteristic diagram showing the relationship between the thrust direction load applied to the drill and the depth of the hole. Atsushi 18
Figure B and Atsushi 18 Figure C are cross-sectional photographs showing the large surface of the substrate processed by Straw 18 Figure A, j * 19 Figure is a characteristic diagram showing the deflection when a load is applied to a conventional drill, and Straw 2o Figure is FIG. 21 is an enlarged view showing the shape of the tip of a conventional drill. FIG. 21 is an enlarged view showing the shape of the tip of another conventional drill. 01...Bed 102...Table 03...
Column 104...Spindle carriage o5...
Processing head 106...Spindle 07...Press shaft 108...Drill 09...Printed circuit board patent 8 Junto Hitachi Seiko Co., Ltd.
Claims (11)
せながら前記ドリルに高速のエアを吹きつけて加工中の
切粉をとり除きながら穴明するプリント基板穴明加工に
使用するドリルであって、芯厚が先端側で小回く、根本
側で大きいことを特徴とする高アスペクト比穴加工用の
ドリル。(1) A drill used for drilling holes in printed circuit boards, in which the drill is gripped by a high-speed spindle and rotated at high speed, while blowing high-speed air onto the drill to remove chips during processing. , a drill for drilling high aspect ratio holes, characterized by a core thickness that is small at the tip and thick at the base.
直径の１０〜２５％、溝巾比が１．２〜２．２、先端角
が１１８°〜１３５°、切刃２番角が１５°〜２０°、
３番角が２５°〜３０°、ねじれ角が２０°〜３５°で
ありテーパエンドに相当する部分の溝断面積がボディ断
面積の２０％以下、かつ、溝終端とボディ終端との間に
溝のない部分を設け、ボディ長が基板厚＋（１．５ｍｍ
〜２．３ｍｍ）であることを特徴とするドリル。(2) The core thickness of the tip of the drill according to claim (1) is 10 to 25% of the drill diameter, the groove width ratio is 1.2 to 2.2, the tip angle is 118° to 135°, and the cutting edge is No. 2. The angle is 15° to 20°,
The third angle is 25° to 30°, the helix angle is 20° to 35°, the groove cross-sectional area of the part corresponding to the tapered end is 20% or less of the body cross-sectional area, and there is a groove between the groove end and the body end. The body length is the board thickness + (1.5mm).
~2.3mm).
．５ｍｍであり、ボディ長が６．４ｍｍ〜７．１ｍｍの
ドリル。(3) The drill diameter according to claim (2) is 0.3 mm to 0.
．． A drill with a body length of 6.4 mm to 7.1 mm.
れ角がドリルの先端側で大きく根本側で小さく連続的に
変化することを特徴とする高アスペクト比穴加工用のド
リル。(4) A drill for drilling high aspect ratio holes according to claims (1), (2), and (3), characterized in that the drill helix angle continuously changes from large at the tip side to small at the base side of the drill. .
４°〜３５°、根本の溝終端部で２０°〜２４°である
ドリル、(5) The tip side helix angle of the drill according to claim (4) is 2.
a drill that is 4° to 35° and 20° to 24° at the root groove end;
厚の変化が直線テーパの他に複数のテーパを複合したも
の、連続的に変化したもの、またこれらを組合わせたも
のであることを特徴とする高アスペクト比穴加工用のド
リル。(6) The core thickness of the drill described in claims (1), (2), and (3) may vary by a combination of a plurality of tapers in addition to a linear taper, or by a combination of these. A drill for drilling high aspect ratio holes.
の断面形状が、ほぼ円弧形状か先端加工後の正面形状に
近似した形状であることを特徴とする高アスペクト穴加
工用のドリル。(7) A high aspect hole characterized in that the cross-sectional shape of the groove of the drill according to claims (1), (2), and (3) is approximately an arc shape or a shape that approximates the front shape after tip processing. Drill for processing.
続的にねじれ角を変化させる手段として、円板式のドリ
ル溝研削砥石の角度と研削時のドリルの回転送り角に対
して、研削時のドリルの軸方向の送りを連続的に変える
ドリルの製造方法。(8) In the drill according to claims (4) and (5), the means for continuously changing the helix angle is based on the angle of the disc-type drill groove grinding wheel and the rotational feed angle of the drill during grinding. A drill manufacturing method that continuously changes the axial feed of the drill during grinding.
ドリルの軸方向の送りの連続的変化が ｙ＝ａｘ、ｙ＝ａｘ＾ｎであるドリルの製造方法。(9) In the method for manufacturing a drill according to claim (8),
A method for manufacturing a drill in which continuous changes in feed in the axial direction of the drill are y=ax, y=ax^n.
厚を変化させる手段として、研削時のドリルの回転角度
及びドリルの軸方向送りに対して円板式のドリルの研削
砥石位置をドリルの軸芯に対して変えるドリルの製造方
法。(10) As a means for continuously changing the core thickness in the drill according to claim (6), the grinding wheel position of the disc-type drill is adjusted relative to the rotation angle of the drill during grinding and the axial feed of the drill. A method of manufacturing a drill that changes the shaft center.
てドリルの研削砥石位置の連続的変化が ｙ＝ｂｘ＾ｎ、ｙ＝ｂｘ＾１＾／＾ｎであるドリルの製
造方法。(11) The method for manufacturing a drill according to claim (10), wherein the continuous change in the position of the grinding wheel of the drill is y=bx^n, y=bx^1^/^n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2039317A JP2879238B2 (en) | 1990-02-20 | 1990-02-20 | Drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2039317A JP2879238B2 (en) | 1990-02-20 | 1990-02-20 | Drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03245908A true JPH03245908A (en) | 1991-11-01 |
| JP2879238B2 JP2879238B2 (en) | 1999-04-05 |
Family
ID=12549735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2039317A Expired - Fee Related JP2879238B2 (en) | 1990-02-20 | 1990-02-20 | Drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2879238B2 (en) |
Cited By (7)
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|---|---|---|---|---|
| US6857828B2 (en) * | 2001-01-09 | 2005-02-22 | Excellon Automation Company | Incremental step drilling system and method |
| JP2009113177A (en) * | 2007-11-08 | 2009-05-28 | Union Tool Co | Drilling tool |
| JP2010214760A (en) * | 2009-03-17 | 2010-09-30 | Dainihon Wood-Preserving Co Ltd | Method of drilling lumber |
| WO2010125881A1 (en) * | 2009-04-27 | 2010-11-04 | 京セラ株式会社 | Drill and method of cutting material to be cut using same |
| CN102189286A (en) * | 2011-06-03 | 2011-09-21 | 开平依利安达电子第五有限公司 | Cutter for improving quality of plug-in hole of circuit board |
| JP2012024852A (en) * | 2010-07-20 | 2012-02-09 | Nachi Fujikoshi Corp | Drill |
| JP2014144517A (en) * | 2013-01-30 | 2014-08-14 | Kyocera Corp | Drill, tool and method of cutting to-be-cut material |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6857828B2 (en) * | 2001-01-09 | 2005-02-22 | Excellon Automation Company | Incremental step drilling system and method |
| JP2009113177A (en) * | 2007-11-08 | 2009-05-28 | Union Tool Co | Drilling tool |
| JP4505007B2 (en) * | 2007-11-08 | 2010-07-14 | ユニオンツール株式会社 | Drilling tool |
| JP2010214760A (en) * | 2009-03-17 | 2010-09-30 | Dainihon Wood-Preserving Co Ltd | Method of drilling lumber |
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| US8882411B2 (en) | 2009-04-27 | 2014-11-11 | Kyocera Corporation | Drill and method of cutting workpiece using the same |
| JP2012024852A (en) * | 2010-07-20 | 2012-02-09 | Nachi Fujikoshi Corp | Drill |
| CN102189286A (en) * | 2011-06-03 | 2011-09-21 | 开平依利安达电子第五有限公司 | Cutter for improving quality of plug-in hole of circuit board |
| JP2014144517A (en) * | 2013-01-30 | 2014-08-14 | Kyocera Corp | Drill, tool and method of cutting to-be-cut material |
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| Publication number | Publication date |
|---|---|
| JP2879238B2 (en) | 1999-04-05 |
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