JP2000218423A - Router machining method - Google Patents
Router machining methodInfo
- Publication number
- JP2000218423A JP2000218423A JP2756199A JP2756199A JP2000218423A JP 2000218423 A JP2000218423 A JP 2000218423A JP 2756199 A JP2756199 A JP 2756199A JP 2756199 A JP2756199 A JP 2756199A JP 2000218423 A JP2000218423 A JP 2000218423A
- Authority
- JP
- Japan
- Prior art keywords
- router
- processing
- curved
- spot facing
- processing method
- 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
Landscapes
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、各種電気機器に数
多く使用されているプリント配線板や集積回路基板のル
ータ加工方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a printed wiring board or an integrated circuit board, which is widely used in various electric appliances.
【0002】[0002]
【従来の技術】近年プリント配線板は電子機器の小型
化、多機能化や電子部品の自動挿入化あるいは表面実装
化などに伴い高密度・高密度化などの厳しい要求がなさ
れている。ことに電子機器の小型化はプリント配線板の
高密度化への要求も高まりプリント配線板の外形端面に
まで導通目的のスルーホールを配置し半田付け部として
実装に利用するなど更なる高密度配線が要求され、プリ
ント配線板加工メーカにおいては加工方法について種々
の検討がなされている。2. Description of the Related Art In recent years, strict requirements have been placed on printed wiring boards, such as high density and high density, in accordance with miniaturization and multifunctionality of electronic devices, automatic insertion of electronic components or surface mounting. In particular, as electronic devices become smaller, the demand for higher density of printed wiring boards also increases, and through-holes for conduction purposes are arranged on the outer end surface of the printed wiring board and used as soldering parts for further high-density wiring. There are various studies on processing methods by printed wiring board processing manufacturers.
【0003】以下従来のプリント配線板のルータ加工方
法について説明する。[0003] A conventional method of processing a router for a printed wiring board will be described below.
【0004】図2〜図5は従来のプリント配線板のルー
タ加工を示すものである。図2〜図5において4はボン
ディングパッド、5はリード線、6は座ぐり加工部分、
7はIC搭載用のプリント配線板、8はIC搭載用のプ
リント配線板が複数個形成された製造用パネル、9a,
9b,9c,9dは座ぐり加工の直線加工部、10a,
10b,10c,10dは座ぐり加工の曲線加工部、1
1はリード線のバリ、12はルータ刃、13a,13b
は切削外周距離、14a,14bは周速、15はルータ
刃の突入箇所、16a,16b,16c,16dはルー
タ刃の移動方向である。FIGS. 2 to 5 show a conventional router processing of a printed wiring board. 2 to 5, 4 is a bonding pad, 5 is a lead wire, 6 is a counterbored portion,
Reference numeral 7 denotes a printed wiring board for mounting an IC, 8 denotes a manufacturing panel on which a plurality of printed wiring boards for mounting an IC are formed, 9a,
9b, 9c, 9d are the counterbored straight processing parts, 10a,
10b, 10c, and 10d are counterbored curved processing portions, 1
1 is a lead wire burr, 12 is a router blade, 13a, 13b
Is the cutting outer peripheral distance, 14a and 14b are peripheral speeds, 15 is the entry position of the router blade, and 16a, 16b, 16c and 16d are the moving directions of the router blade.
【0005】図2(a),(b)に示すようなボンディ
ングパッド4、リード線5、IC搭載用のプリント配線
板7を複数個有するプリント配線板の製造用パネル8を
加工する場合、特開平6−237053号公報に記載さ
れている従来の方法によれば、図5に示すように、ま
ず、座ぐり加工部分6内に座ぐり加工幅と同径のルータ
刃を突入させる個所15を一個所設定し、規定深さ(座
ぐり深さ)だけ突入させた後、その状態でルータ刃を1
6a,16b,16c,16dの順で一定回転、一定速
度で移動させ、再び最初の突入個所15に至るまで一周
させ、座ぐり加工部分6を形成する。このとき形成され
る座ぐり加工部分6の外形は、図3に示すような直線加
工部9a,9b,9c,9dとコーナーの曲線加工部1
0a,10b,10c,10dから構成される。In the case of processing a printed wiring board manufacturing panel 8 having a plurality of bonding pads 4, lead wires 5, and a plurality of printed wiring boards 7 for mounting ICs as shown in FIGS. 2 (a) and 2 (b), According to the conventional method described in Japanese Unexamined Patent Publication No. Hei 6-237053, first, as shown in FIG. 5, a place 15 into which a router blade having the same diameter as the spot facing width is inserted into the spot facing part 6 is formed. After setting one location and piercing it by the specified depth (counterbore depth),
6a, 16b, 16c, and 16d are moved at a constant rotation and a constant speed in the order, and the circuit is once again turned to the first entry point 15 to form the spot facing portion 6. The external shape of the counterbore processing portion 6 formed at this time includes straight processing portions 9a, 9b, 9c, 9d as shown in FIG.
0a, 10b, 10c, and 10d.
【0006】[0006]
【発明が解決しようとする課題】図4(a)は、座ぐり
加工部分6及び各座ぐり加工部分の曲線部分に発生した
リード線のバリ11から構成されており、前記従来のル
ータ加工方法では、図4(a)で示すように、座ぐり加
工部分6内の曲線部分において切削後、リード線にバリ
11が発生し、ショート不良などの原因となる。FIG. 4A shows a conventional router processing method which comprises a counterbore processing portion 6 and burrs 11 of lead wires generated in a curved portion of each counterbore processing portion. In this case, as shown in FIG. 4A, burrs 11 are generated on the lead wire after cutting in a curved portion in the spot facing portion 6, which causes a short circuit failure or the like.
【0007】図4(b)は、ルータ刃12及び周速14
a,14b、切削外周距離13a,13bから構成され
ており、上記バリ11の発生は、図4(b)に示すよう
に、各直線加工部(9a〜9d)を切削しているときの
ルータ刃12の周速14aと各コーナーの曲線加工部
(10a〜10d)を切削しているときの周速14bは
一定回転、一定速度で移動するルータ刃であれば14a
=14bであるのに対して、直線加工部におけるルータ
刃の一回転あたりの切削外周距離13aと各コーナーの
曲線加工部の、ルータ刃の一回転あたりの切削外周距離
13bは、一定回転、一定速度で移動するルータ刃であ
れば13a<13bとなり、必然的な切削力の違いが生
じることに起因している。FIG. 4B shows a router blade 12 and a peripheral speed 14.
a and 14b, and cutting outer peripheral distances 13a and 13b. The burr 11 is generated by a router when cutting each straight processing portion (9a to 9d) as shown in FIG. The peripheral speed 14a of the blade 12 and the peripheral speed 14b when cutting the curved portion (10a to 10d) at each corner are 14a for a router blade moving at a constant rotation and a constant speed.
= 14b, while the cutting outer circumference 13a per rotation of the router blade in the straight processing portion and the cutting outer peripheral distance 13b per rotation of the router blade in the curved processing portion at each corner are constant rotation and constant. In the case of a router blade moving at a speed, 13a <13b, which results in an inevitable difference in cutting force.
【0008】上記の課題を解決するために従来では、特
開昭63−152198号公報に開示されているが如
く、切断予定線や孔抜き加工線に到達しないようにパタ
ーン導体を設計し、バリを発生させない方法もあるが、
配線設計の制約により細線高密度化する製品には対応で
きないという問題がある。しかも半導体素子と接続端子
とのボンディング性を向上させるため、パターン導体に
電解金めっき処理をすることが主流になっている近年の
IC搭載用のプリント配線板の工法では、上記金めっき
をするためのプリント配線板上へのリード線の形成は不
可欠であり、金めっき後のルータ加工によるリード線の
切断加工も同様に不可欠であるという問題がある。In order to solve the above-mentioned problems, a pattern conductor is conventionally designed so as not to reach a line to be cut or a hole to be cut, as disclosed in Japanese Patent Laid-Open No. 63-152198, and a burr is formed. There is a method that does not cause
There is a problem that it is not possible to cope with a product in which the density of fine wires is increased due to the restriction of wiring design. Moreover, in order to improve the bonding property between the semiconductor element and the connection terminal, in recent years, a printed wiring board for mounting an IC has been mainly subjected to electrolytic gold plating on the pattern conductor. The formation of lead wires on a printed wiring board is indispensable, and the cutting of lead wires by router processing after gold plating is also indispensable.
【0009】さらに、特開平4−130790号公報に
開示されているが如く、ルータ刃を押し込みながら移動
して切削することにより、プリント配線板表面のパター
ン導体に切削バリが発生することを回避しているが、こ
の工法では、座ぐり加工した底面の平滑さが無く、底面
に凹凸が生じてしまい、部品実装スペースとして使用さ
れた場合の寸法精度、或いは基板の強度に影響するとい
う問題がある。Further, as disclosed in Japanese Patent Application Laid-Open No. 4-130790, by cutting while moving while pushing a router blade, it is possible to avoid generation of cutting burrs on the pattern conductor on the surface of the printed wiring board. However, in this method, there is a problem in that the counterbore-processed bottom surface is not smooth and unevenness is generated on the bottom surface, which affects the dimensional accuracy when used as a component mounting space or the strength of the board. .
【0010】本発明は、上記従来の課題を解決し、リー
ド線がコーナーの曲線加工部に存在した場合においても
バリを発生させることなく座ぐり加工が可能なプリント
配線板のルータ加工方法を提供するものである。The present invention solves the above-mentioned conventional problems, and provides a method of processing a printed wiring board which can be spotted without generating burrs even when a lead wire is present at a curved portion of a corner. Is what you do.
【0011】[0011]
【課題を解決するための手段】この目的を達成するため
に本発明は、一定回転数、一定速度で切削するルータに
よる座ぐり加工において、加工後の形状が曲線である部
分のみを先行して加工し、その後直線部分を加工するこ
とを特徴としたプリント配線板の加工方法であり、ルー
タ刃による先行座ぐり加工した曲線加工部及び、先行座
ぐり加工終了後に、順次座ぐり加工していく直線加工部
分から構成された座ぐり加工方法である。SUMMARY OF THE INVENTION In order to achieve this object, according to the present invention, in a counterboring process using a router that cuts at a constant rotation speed and a constant speed, only a portion having a curved shape after machining is preceded. This is a method of processing a printed wiring board characterized by processing and then processing the straight line part. The counterbore processing is performed by the pre-counterbore machining with the router blade, and the counterbore processing is performed sequentially after the pre-counterbore processing is completed. This is a counterbore processing method composed of straight processing parts.
【0012】[0012]
【発明の実施の形態】本発明の請求項1に記載の発明
は、回転するルータと被加工物が相対移動することによ
って被加工物を外形加工するルータ加工方法において、
曲線加工部のみを先行して加工した後、残りの直線加工
部を加工することを特徴とするルータ加工方法としたも
のであり、直線加工部とは切削能力が異なる曲線加工部
のみを被加工物のコーナー部に発生しやすいバリ等を解
消するという作用を有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An invention according to claim 1 of the present invention is directed to a router processing method for externally processing a workpiece by relatively moving a rotating router and the workpiece.
It is a router processing method characterized by processing only the curved processing part in advance and then processing the remaining linear processing part. Only the curved processing part with a different cutting ability from the linear processing part is processed. It has the effect of eliminating burrs and the like that are likely to occur at corners of objects.
【0013】本発明の請求項2に記載の発明は、曲線加
工部の少なくとも1点をルータの回転により穴明け加工
する請求項1に記載のルータ加工方法としたものであ
り、曲線加工部の形状に応じて少なくとも1点あるいは
複数点を先行して垂直方向へにルータの回転により加工
することによりバリ等の発生を防止するという作用を有
する。According to a second aspect of the present invention, there is provided the router processing method according to the first aspect, wherein at least one point of the curved portion is drilled by rotating the router. By processing at least one point or a plurality of points in advance according to the shape in the vertical direction by rotating the router, an effect of preventing generation of burrs and the like is provided.
【0014】本発明の請求項3に記載の発明は、被加工
物が電気めっき用のリード線用のパターン導体を有する
回路基板である請求項1に記載のルータ加工方法とした
ものであり、曲線加工部に形成されたリード線のバリを
解消するという作用を有する。According to a third aspect of the present invention, there is provided the router processing method according to the first aspect, wherein the workpiece is a circuit board having a pattern conductor for a lead wire for electroplating. This has the effect of eliminating burrs on the lead wire formed in the curved portion.
【0015】本発明の請求項4に記載の発明は、曲線加
工部に用いるルータ径は直線加工部に用いるルータ径と
同等もしくは小径である請求項1に記載のルータ加工方
法としたものであり、曲線加工部のバリ等を解消し、さ
らに加工の寸法精度を向上するという作用を有する。According to a fourth aspect of the present invention, there is provided the router processing method according to the first aspect, wherein the router diameter used for the curved processing portion is equal to or smaller than the router diameter used for the linear processing portion. In addition, it has the effect of eliminating burrs and the like in the curved processing portion and further improving the dimensional accuracy of the processing.
【0016】本発明の請求項5に記載の発明は、曲線加
工部を加工する際のルータ回転数を直線加工部を加工す
る際のルータ回転数より一定の割合で高くした請求項1
に記載のルータ加工方法としたものであり、曲線加工部
のバリ等を効率的に解消し、さらに加工の寸法精度を向
上するという作用を有する。According to a fifth aspect of the present invention, the router rotation speed at the time of processing the curved processing portion is made higher at a fixed rate than the router rotation speed at the time of processing the linear processing portion.
And has a function of efficiently eliminating burrs and the like at a curved processing portion and further improving dimensional accuracy of the processing.
【0017】本発明の請求項6に記載の発明は、一定割
合が5〜10%である請求項5に記載のルータ加工方法
としたものであり、上記の割合の範囲内での加工が曲線
加工部のバリ等を効率的に解消し、さらに加工の寸法精
度を向上するという作用を有する。According to a sixth aspect of the present invention, there is provided the router processing method according to the fifth aspect, wherein the fixed ratio is 5 to 10%. This has the effect of efficiently eliminating burrs and the like in the processed part and further improving the dimensional accuracy of the processing.
【0018】本発明の請求項7に記載の発明は、複数の
曲線加工部のうち最後に加工する曲線加工部の直後にル
ータを被加工物から離すことなく、直線加工部を加工す
る請求項1に記載のルータ加工方法としたものであり、
加工生産性を向上させるという作用を有する。According to a seventh aspect of the present invention, a straight line processing portion is processed immediately after the last curve processing portion of the plurality of curve processing portions without separating the router from the workpiece. 1. The router processing method described in 1.
It has the effect of improving processing productivity.
【0019】(実施の形態)以下、本発明の実施の形態
について、図面を参照しながら説明する。(Embodiments) Embodiments of the present invention will be described below with reference to the drawings.
【0020】図1は本発明の一実施の形態を示すプリン
ト配線板のルータ加工方法を説明する平面図である。図
1において1a,1b,1c,1dはルータ刃による先
行座ぐりの曲線加工部分、2a,2b,2c,2dは直
線座ぐり直線加工部分、3はルータ刃の移動方向であ
る。FIG. 1 is a plan view for explaining a method for processing a router of a printed wiring board according to an embodiment of the present invention. In FIG. 1, reference numerals 1a, 1b, 1c, and 1d denote curved machining portions of the preceding spot facing by the router blade, reference numerals 2a, 2b, 2c, and 2d denote straight machining portions of the linear counterbore, and reference numeral 3 denotes a moving direction of the router blade.
【0021】まず図1に示すように、一定回転数、一定
速度で切削するルータによる座ぐり加工において、曲線
加工部分のみ先行して加工し、その後直線加工部分を加
工することを特徴としたプリント配線板のルータ加工方
法であり、リード線がコーナーの湾曲部分に存在した場
合においても、先行座ぐり加工により、バリを発生させ
ることなく座ぐり加工ができるという作用を行うもの
で、ルータ刃による先行座ぐり加工部分1a,1b,1
c,1d及び、先行座ぐり加工終了後に、順次座ぐり加
工していく直線座ぐり加工部分2a,2b,2c,2d
から構成されている。First, as shown in FIG. 1, in a counterboring process by a router that cuts at a constant rotation speed and a constant speed, a print characterized in that only a curved portion is processed first, and then a straight line processed portion is processed. This is a router processing method for wiring boards, and even when a lead wire is present at a curved part of a corner, the counterboring process can be performed without the occurrence of burrs by the advance counterboring process. Preceding counterbore processing parts 1a, 1b, 1
c, 1d and straight counterbore processing portions 2a, 2b, 2c, 2d which are sequentially counterbore processed after the preceding counterbore processing is completed.
It is composed of
【0022】図1に示すように、座ぐり加工幅と同径の
ルータ刃を使用し、ルータ刃が規定の回転数に達した
後、1aの位置に移動させ、規定の座ぐり深さまでZ方
向にのみ切り込む(先行座ぐり加工の最初の突入個所は
1a,1b,1c,1dのいずれでも可能である)。こ
の時のルータ刃の回転数は直線加工部分の回転数よりも
5〜10%高い38000〜40000rpmであるこ
とが望ましい。As shown in FIG. 1, a router blade having the same diameter as the counterbore processing width is used, and after the router blade reaches a specified number of revolutions, it is moved to the position 1a to reach a specified counterbore depth. Cut only in the direction (the first entry point of the preceding spot facing process can be any of 1a, 1b, 1c, 1d). At this time, the rotation speed of the router blade is desirably 38000 to 40000 rpm, which is 5 to 10% higher than the rotation speed of the straight processing portion.
【0023】その後、ルータ刃を1aの位置のままで上
昇させ、プリント基板表面から離脱させ、そのまま次の
先行座ぐり加工点1bまで移動し、同様に加工する。以
後、順次1c〜1dと同様に座ぐり加工し、先行座ぐり
加工を行うすべての箇所を同様に加工する。この先行座
ぐり加工する順番は、第一突入箇所から、近接する順に
加工していくことが望ましい。Thereafter, the router blade is raised at the position 1a, detached from the surface of the printed circuit board, moved to the next spot facing point 1b as it is, and processed similarly. Thereafter, spot facing is performed in the same manner as in steps 1c to 1d, and all locations where preceding spot facing is performed are also processed in the same manner. It is desirable that the preceding counterbore processing be performed in the order of approaching from the first entry point.
【0024】次に、1dの位置で規定の座ぐり深さまで
Z方向にのみ切り込んだ後は、ルータ刃を3方向へ規定
の回転数、送り速度を保持したまま移動させ、直線座ぐ
り部2aの加工へと移り、2b〜2c〜2dを順に座ぐ
り加工していく。この時の送り速度は一分間あたり40
cmであることが望ましい。Next, after cutting in the Z direction only to the specified counterbore depth at the position 1d, the router blade is moved in three directions while maintaining the specified number of revolutions and the feed speed, and the linear counterbore 2a is cut. , And counterbore processing of 2b to 2c to 2d is sequentially performed. The feed speed at this time is 40 per minute
cm.
【0025】最後に、直線座ぐり部2dを座ぐり加工し
た後、ルータ刃を1dの位置で再びZ方向に引き上げ、
基板表面より離脱させる。なお、以上の説明では、ルー
タ刃の径を座ぐり加工幅と同径に設定したが、座ぐり加
工幅より小径のルータ刃を用いても同様に実施可能であ
る。Finally, after the straight spot facing portion 2d is spotted, the router blade is pulled up again in the Z direction at the position 1d.
Separate from the substrate surface. In the above description, the diameter of the router blade is set to the same diameter as the spot facing width. However, the present invention can be similarly implemented by using a router blade having a smaller diameter than the spot facing width.
【0026】[0026]
【発明の効果】以上のように本発明によれば、リード線
がコーナーの湾曲部分に存在した場合においても、先行
座ぐり加工により除去できるため、バリを発生させるこ
となく座ぐり加工ができるという有利な効果が得られ
る。As described above, according to the present invention, even when a lead wire is present at a curved portion of a corner, it can be removed by preceding spot facing, so that spot facing can be performed without generating burrs. An advantageous effect is obtained.
【図1】本発明の一実施の形態によるルータ刃を用いた
座ぐり加工方法を示す説明図FIG. 1 is an explanatory view showing a spot facing method using a router blade according to an embodiment of the present invention;
【図2】従来例における部品実装部分を有するプリント
配線板を示す説明図FIG. 2 is an explanatory view showing a printed wiring board having a component mounting portion in a conventional example.
【図3】従来例におけるルータ刃による座ぐり加工によ
り形成される一座ぐり形状を示す説明図FIG. 3 is an explanatory view showing a single spot facing shape formed by spot facing using a router blade in a conventional example.
【図4】従来例における、ルータ刃による座ぐり加工の
問題点を示す説明図FIG. 4 is an explanatory view showing a problem of spot facing with a router blade in a conventional example.
【図5】従来例における、ルータ刃による座ぐり加工方
法を示す説明図FIG. 5 is an explanatory view showing a spot facing method using a router blade in a conventional example.
1a〜1d 曲線加工部 2a〜2d 直線加工部 3 ルータ刃の移動方向 4 ボンディングパッド 5 リード線 6 座ぐり加工部分 7 IC搭載用プリント配線板 8 製造用パネル 9a〜9d 座ぐり加工の直線部分 10a〜10d 座ぐり加工のコーナ部分 11 リード線のバリ 12 ルータ刃 13a,13b 切削外周距離 14a,14b 周速 15 ルータ刃の突入箇所 16a〜16d ルータ刃の移動方向 1a-1d Curved portion 2a-2d Straight portion 3 Router blade moving direction 4 Bonding pad 5 Lead wire 6 Counterbore portion 7 Printed wiring board for mounting IC 8 Manufacturing panel 9a-9d Linear portion of counterbore portion 10a 10 to 10d Corner portion for spot facing 11 Lead burr 12 Router blade 13a, 13b Cutting outer peripheral distance 14a, 14b Circumferential speed 15 Router blade entry point 16a to 16d Router blade moving direction
Claims (7)
ることによって被加工物を外形加工するルータ加工方法
において、曲線加工部のみを先行して加工した後、残り
の直線加工部を加工することを特徴とするルータ加工方
法。In a router processing method for processing an outer shape of a workpiece by rotating a rotating router and a workpiece relative to each other, only a curved processing portion is first processed, and then the remaining straight processing portion is processed. A router processing method, characterized in that:
回転により穴明け加工する請求項1に記載のルータ加工
方法。2. The router processing method according to claim 1, wherein at least one point of the curved processing portion is drilled by rotating the router.
パターン導体を有する回路基板である請求項1に記載の
ルータ加工方法。3. The router processing method according to claim 1, wherein the workpiece is a circuit board having a pattern conductor for a lead wire for electroplating.
部に用いるルータ径と同等もしくは小径である請求項1
に記載のルータ加工方法。4. The router diameter used for the curved part is equal to or smaller than the router diameter used for the straight part.
Router processing method described in.
を直線加工部を加工する際のルータ回転数より一定の割
合で高くした請求項1に記載のルータ加工方法。5. The router processing method according to claim 1, wherein the router rotation speed at the time of processing the curved processing portion is higher at a fixed rate than the router rotation speed at the time of processing the linear processing portion.
記載のルータ加工方法。6. The router processing method according to claim 5, wherein the fixed ratio is 5 to 10%.
曲線加工部の直後にルータを被加工物から離すことな
く、直線加工部を加工する請求項1に記載のルータ加工
方法。7. The router processing method according to claim 1, wherein the straight processing section is processed immediately after the last curved processing section of the plurality of curved processing sections without separating the router from the workpiece.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02756199A JP4032550B2 (en) | 1999-02-04 | 1999-02-04 | Router processing method |
Applications Claiming Priority (1)
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JP02756199A JP4032550B2 (en) | 1999-02-04 | 1999-02-04 | Router processing method |
Publications (2)
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JP2000218423A true JP2000218423A (en) | 2000-08-08 |
JP4032550B2 JP4032550B2 (en) | 2008-01-16 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101966605A (en) * | 2010-09-30 | 2011-02-09 | 王开来 | Method for milling slot by intelligent card slot milling machine |
-
1999
- 1999-02-04 JP JP02756199A patent/JP4032550B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101966605A (en) * | 2010-09-30 | 2011-02-09 | 王开来 | Method for milling slot by intelligent card slot milling machine |
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JP4032550B2 (en) | 2008-01-16 |
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