JPH0211365B2 - - Google Patents
Info
- Publication number
- JPH0211365B2 JPH0211365B2 JP61154496A JP15449686A JPH0211365B2 JP H0211365 B2 JPH0211365 B2 JP H0211365B2 JP 61154496 A JP61154496 A JP 61154496A JP 15449686 A JP15449686 A JP 15449686A JP H0211365 B2 JPH0211365 B2 JP H0211365B2
- Authority
- JP
- Japan
- Prior art keywords
- rod
- support rod
- holder
- center
- fixed
- 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.)
- Expired - Lifetime
Links
- 238000003801 milling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Milling Processes (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、植刃フライス工具に代るものであつ
て、チヤツキングされる軸杆と一体の円形の座板
の表面に設けた放射状の溝に、チツプを固定した
所定サイズの支持杆を交換自在に固定するように
した平面切削工具に関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention is a tool that replaces a socket milling tool, and is a tool that uses radial grooves provided on the surface of a circular seat plate that is integral with a shaft rod to be chucked. The present invention relates to a flat cutting tool in which a support rod of a predetermined size to which a chip is fixed is fixed in a replaceable manner.
（従来の技術）
従来公知の実公昭51−23436号公報に記載され
た平面切削工具は、外端部にバイト取付部を形成
した２本の一文字形チヤツク杆を、バイト取付部
のチヤツク本体の対角位置に位置せしめて、該バ
イド取付部間の距離を拡張、縮小自在に平行に対
設すると共に、チヤツク本体と面接触するチヤツ
ク杆の外向側面部には所定の割り出し寸法を以て
位置決め用凹部を夫々刻設してチヤツク本体に螺
着した固定ねじの先端部を掛合させ、更にチヤツ
ク杆の内向側面部に対向させて形成した斜面には
くさび状押え片を面接触させて、該くさび状押え
片を介して締着ねじでチヤツク杆をチヤツク本体
に共通に固定した構成としたものである。(Prior art) The plane cutting tool described in the conventionally known Japanese Utility Model Publication No. 51-23436 has two single-letter chuck rods with a bite attachment part formed at their outer ends. They are positioned diagonally and parallel to each other so that the distance between the bite mounting parts can be expanded or reduced, and a positioning recess with a predetermined indexing dimension is formed on the outward side surface of the chuck rod that makes surface contact with the chuck body. are carved into the chuck rod and engaged with the tips of fixing screws screwed into the chuck body, and a wedge-shaped presser piece is brought into surface contact with the slope formed opposite to the inward side surface of the chuck rod. The chuck rod is commonly fixed to the chuck body with a fastening screw via a presser piece.
（発明が解決しようとする問題点）
上記の平面切削工具は、２本の一文字形チヤツ
ク杆を径方向にスライド調節して切削範囲を拡
張、縮小するものであるため、バイトは２本が限
度であること及びバイト固定位置が切削面から高
位置となるとともに、このバイトをチヤツク杆に
固定しさらにチヤツク杆を中央部で固定している
ために、切削時に振動が生じ、ガタ付きが激し
く、平滑な切削面を形成することができない致命
的な欠点がある。(Problem to be Solved by the Invention) The above-mentioned flat cutting tool expands and contracts the cutting range by adjusting the two single-letter chuck rods in the radial direction, so the cutting tool is limited to two. Because the cutting tool is fixed at a high position from the cutting surface, and because the cutting tool is fixed to the chuck rod and the chuck rod is fixed in the center, vibration occurs during cutting, causing severe rattling. A fatal drawback is that a smooth cutting surface cannot be formed.
また、摩耗したバイトの交換においては、チヤ
ツク杆に固定されたバイトを外し、新たな若しく
は研磨したバイトを装着すればよいのであるが、
基準となるものがないため、チヤツク杆からの垂
下量の設定が困難であつて、良好な切削精度を期
待することができない欠点がある。 Also, when replacing a worn bit, all you have to do is remove the bit fixed to the chuck rod and install a new or polished bit.
Since there is no standard, it is difficult to set the amount of hanging from the chuck rod, and good cutting accuracy cannot be expected.
本発明は前記従来技術の欠点に鑑み、チツプを
固定した各種サイズの三本以上の支持杆を、簡単
且つ確実強固に座部に交換固定できるようにし
て、標準のホルダーの径及び軸杆のもので、より
広い幅の広い面を平滑で精度の良い切削ができる
平面切削工具を提供することを目的としている。 In view of the above-mentioned drawbacks of the prior art, the present invention enables three or more support rods of various sizes to which chips are fixed to be easily and reliably and firmly exchanged and fixed to the seat, and the diameter of the standard holder and the shaft rod can be changed easily and reliably. The purpose is to provide a flat cutting tool that can cut wider surfaces with smoothness and precision.
（問題点を解決するための手段）
本発明に係る平面切削工具は、ホルダーＢを共
通として切削範囲径を変更できるようにした平面
切削工具を、所定サイズの三本以上の支持杆Ａ
と、座部８の裏面中央に軸杆９を突設したホルダ
ーＢとから構成し、支持杆Ａは、一端を斜めの接
当面２とし且つ他端の頭部５にチツプＣを固定し
た構成とし、該ホルダーＢは、座部８の表面に三
本以上の取付溝１０を放射状に設けるとともに、
該取付溝１０の交錯する中心若しくは同心円上の
取付溝１０に溝深さに納まる高さの円柱１１を固
定し、取付溝１０の側壁には締付け座部の中心方
向へ作用する固定ネジ１４を設けた構成とし、前
記各取付溝１０へ、一定サイズの支持杆Ａの斜め
の接当面２を円柱１１に接当した状態で嵌合して
固定ネジ１４で固定することにより、各種サイズ
の支持杆Ａに交換固定できるようにしたことを特
徴とするものである。(Means for Solving the Problems) The flat cutting tool according to the present invention has three or more support rods A of a predetermined size.
and a holder B having a shaft rod 9 protruding from the center of the back surface of the seat part 8, and the support rod A has a structure in which one end has an oblique contact surface 2 and a tip C is fixed to the head 5 at the other end. The holder B is provided with three or more mounting grooves 10 radially on the surface of the seat portion 8, and
A cylinder 11 having a height that fits within the depth of the groove is fixed to the mounting groove 10 on the intersecting center or concentric circles of the mounting groove 10, and a fixing screw 14 that acts toward the center of the tightening seat is attached to the side wall of the mounting groove 10. By fitting the diagonal abutment surface 2 of a support rod A of a certain size into the respective mounting grooves 10 in a state in contact with the cylinder 11 and fixing it with the fixing screw 14, support of various sizes can be achieved. It is characterized by being able to be exchanged and fixed to the rod A.
（実施例）
本発明の実施例を図面により説明すると以下の
通りである。(Example) An example of the present invention will be described below with reference to the drawings.
即ち、本発明の平面切削工具は、第１図乃至第
８図に示したように、チツプＣを固定する支持杆
Ａと、該チツプＣを座部８の中心より等距離に位
置するように、支持杆Ａを着脱自在に取付けるホ
ルダーＢとよりなるものである。 That is, as shown in FIGS. 1 to 8, the flat cutting tool of the present invention has a support rod A for fixing the chip C, and a support rod A that positions the chip C at an equal distance from the center of the seat portion 8. , and a holder B to which the support rod A is detachably attached.
支持杆Ａは、第１図及び第２図に示すように、
一端に斜めの接当面２を接けた杆部１に、チツプ
Ｃを固定する頭部５を連設してなり、この杆部１
は、第１図に示したように、左端を斜めにした接
当面２を有し、上面の略中央に杆部１に対し、斜
めに係止孔３を設け、下面を少許裾広がりに傾斜
させて、傾斜面４を形成してなるものである。
又、頭部５は段壁１８に旋盤用のチツプＣを固定
するためのもので、取付杆７の軸溝１９にリング
２０を嵌装し、取付杆７を軸孔２１に挿入して、
軸孔２１の周溝２２にリング２０が嵌装し、取付
杆７は軸孔２１に枢着する。そして、先端が偏心
する止軸６を有する取付杆７を頭部５に対して斜
めに取付け、この止軸６を回動させ、チツプＣを
段壁１８に圧接固定するものである。 As shown in FIGS. 1 and 2, the support rod A is
A head part 5 for fixing a chip C is connected to a rod part 1 which has a diagonal abutment surface 2 at one end, and this rod part 1
As shown in Fig. 1, it has an abutting surface 2 with the left end slanted, a locking hole 3 is provided diagonally to the rod part 1 approximately in the center of the upper surface, and the lower surface is slanted to slightly widen the hem. In this case, an inclined surface 4 is formed.
The head 5 is for fixing a lathe chip C to the stepped wall 18. A ring 20 is fitted into the shaft groove 19 of the mounting rod 7, and the mounting rod 7 is inserted into the shaft hole 21.
The ring 20 is fitted into the circumferential groove 22 of the shaft hole 21, and the mounting rod 7 is pivotally attached to the shaft hole 21. A mounting rod 7 having a stop shaft 6 whose tip is eccentric is attached obliquely to the head 5, and the stop shaft 6 is rotated to press and fix the chip C to the step wall 18.
ホルダーＢは、第５図及び第６図に示したよう
に、座部８の裏面中央に軸杆９を突設してなるも
ので、座部８は、第５図に示したように、表面に
前記支持杆Ａを固定する取付溝１０，１０，１０
を略Ｙ字状に刻設し、座部８の中央に支持杆Ａの
接当面２と接当する円柱１１をボルト１２により
固着し、座部８の外周壁から取付溝１０，１０，
１０にかけて斜めにネジ孔１３，１３，１３を設
け、ボール１６，１６，１６を介して該係止孔３
に接当して支持杆Ａを固定する固定ネジ１４，１
４，１４を該ネジ孔１３，１３，１３に螺着し、
該取付溝１０，１０，１０の円周外端表面部付近
に切欠部１５，１５，１５を設けてなるものであ
る。 As shown in FIGS. 5 and 6, the holder B has a shaft 9 protruding from the center of the back surface of a seat 8. As shown in FIG. Mounting grooves 10, 10, 10 for fixing the support rod A on the surface
is carved into a substantially Y-shape, and a cylinder 11 that contacts the contact surface 2 of the support rod A is fixed in the center of the seat part 8 with a bolt 12, and mounting grooves 10, 10,
Screw holes 13, 13, 13 are provided diagonally through the locking hole 3 through the balls 16, 16, 16.
A fixing screw 14,1 that fixes the support rod A by contacting the
4, 14 into the screw holes 13, 13, 13,
Notches 15, 15, 15 are provided near the circumferential outer end surfaces of the mounting grooves 10, 10, 10.
次に前記本発明の切削工具の使用方法について
説明するに、ホルダーＢの取付溝１０に支持杆Ａ
の杆部１を接当面２から該取付溝１０に沿つて挿
入し、該接当面２を円柱１１に接当させた後、支
持杆Ａの係止孔３にボール１６が接当するまで固
定ネジ１４を回して、チツプＣを固定した支持杆
ＡをホルダーＢに固定し、同様にして、他の支持
杆Ａを取付溝１０，１０に固定してホルダーＢに
取付杆Ａを取付け、第７図に示した状態とする。 Next, to explain how to use the cutting tool of the present invention, the support rod A is inserted into the mounting groove 10 of the holder B.
Insert the rod part 1 from the contact surface 2 along the mounting groove 10, bring the contact surface 2 into contact with the cylinder 11, and then fix until the ball 16 contacts the locking hole 3 of the support rod A. Turn the screw 14 to fix the support rod A on which the chip C is fixed to the holder B. In the same way, fix the other support rod A to the mounting grooves 10, 10, and attach the mounting rod A to the holder B. The state shown in Figure 7 is established.
そして該切削工具の軸杆９をフライス本体等の
チヤツク部１７に取付け、第９図に示した状態と
して使用する。ここで支持杆Ａに傾斜面４を設
け、この支持杆ＡをホルダーＢの取付溝１０に挿
入係止して、円柱１１部分へくさび状態に圧入固
定しているため、少許固定ネジ１４が緩んでも、
該支持杆Ａが該取付溝１０より落下しない。 Then, the shaft rod 9 of the cutting tool is attached to the chuck portion 17 of the milling cutter body, etc., and the cutting tool is used in the state shown in FIG. Here, the support rod A is provided with an inclined surface 4, and this support rod A is inserted and locked into the mounting groove 10 of the holder B, and is press-fitted into the column 11 portion in a wedge-like manner, so that the fixing screw 14 may loosen slightly. but,
The support rod A does not fall from the mounting groove 10.
なお前記実施例では、円柱１１を座部８の中央
に一個取付けた例で説明したが、座部８の中心と
同心円上に複数の円柱１１を取付けたものとして
もよく、又、取付溝１０の数も３本に限定するも
のではなく、任意の本数設け得るものである。 In the above embodiment, one cylinder 11 is attached to the center of the seat 8. However, a plurality of cylinders 11 may be installed concentrically with the center of the seat 8. The number is not limited to three, and any number can be provided.
即ち、支持杆Ａは杆部１の一端に斜めの接当面
２を設け、他端の頭部５にチツプＣを固定してな
り、ホルダーＢは座部８の裏面中央に軸杆９を突
設し、第１０図に示すように、座部８の表面に六
本の取付溝１０を放射状に設け、座部８の中心と
同心円上の該取付溝１０に円柱１１を配設してな
り、該座部８の円柱１１に各支持杆Ａの接当面２
を接当させて、各チツプＣが座部８の中心より当
距離に位置するように各支持杆ＡをホルダーＢの
取付溝１０に固定ネジ１４で着脱自在に取付けて
なる構成とするものである。 That is, the support rod A has a diagonal contact surface 2 at one end of the rod portion 1 and a tip C fixed to the head 5 at the other end, and the holder B has a shaft rod 9 protruding from the center of the back surface of the seat portion 8. As shown in FIG. 10, six mounting grooves 10 are provided radially on the surface of the seat 8, and a cylinder 11 is arranged in the mounting groove 10 concentrically with the center of the seat 8. , the contact surface 2 of each support rod A is attached to the cylinder 11 of the seat 8.
Each support rod A is removably attached to the mounting groove 10 of the holder B with a fixing screw 14 so that each chip C is positioned at the same distance from the center of the seat part 8. be.
（発明の作用効果）
本発明に係る平面切削工具は、所定サイズの三
本以上の支持杆Ａと、座部８の裏面中央に軸杆９
を突設したホルダーＢとから構成し、支持杆Ａ
は、一端を斜めの接当面２とし他端の頭部５にチ
ツプＣを固定した構成とし、該ホルダーＢは、座
部８の表面に三本以上の取付溝１０を放射状に設
けるとともに、該取付溝１０の交錯する中心若し
くは中心と同心円上の取付溝１０に溝深さに納ま
る高さの円柱１１を固定し、取付溝１０の側壁に
は締付け座部の中心方向へ作用する固定ネジ１４
を設けた構成とし、前記各取付溝１０へ、一定サ
イズの支持杆Ａを、その一端の接当面２を円柱１
１に接当した状態で嵌合して固定ネジ１４で固定
することにより、各種サイズの支持杆Ａに交換固
定できるようにしたから、支持杆Ａをスライド調
節する複雑且つ厄介な作業をすることなく、支持
杆Ａの簡単な交錯により、一個のホルダーＢで杆
部１の長さの異なる支持杆Ａを使用し、ホルダー
Ｂを差替えることなく、標準のホルダーの径及び
軸杆のものでより広い幅を切削することができ
る。(Operation and Effect of the Invention) The plane cutting tool according to the present invention includes three or more support rods A of a predetermined size, and a shaft rod 9 at the center of the back surface of the seat portion 8.
It consists of a holder B with a protruding support rod A
The holder B has an oblique contact surface 2 at one end and a chip C fixed to the head 5 at the other end. A cylinder 11 having a height that fits within the depth of the groove is fixed to the mounting groove 10 at the intersection of the mounting grooves 10 or on a concentric circle with the center, and a fixing screw 14 is attached to the side wall of the mounting groove 10 and acts toward the center of the tightening seat.
A support rod A of a certain size is attached to each of the mounting grooves 10, and the contact surface 2 at one end is connected to a cylinder 1.
1 and fixed with the fixing screw 14, it is possible to replace and fix the support rod A with various sizes, thereby eliminating the complicated and troublesome work of sliding and adjusting the support rod A. By simply intersecting the support rods A, you can use support rods A with different lengths of rod portions 1 in one holder B, and without replacing holder B, it is possible to use the standard holder diameter and shaft rod. Can cut wider widths.
また、支持杆Ａは予め所定サイズに製作されて
おり、しかも取付溝１０内にあつて固定ネジによ
る溝壁面への押圧と、一端部の傾斜した接当面部
分が溝壁面と円柱１１の間へくさび状に進入する
ことにより、ガタ付きのない強固な固定がなされ
るから、各支持杆Ａの各チツプＣが座部８の中心
より等距離の位置となる正確な芯出しが簡単にで
きて正確な切削径を確保することができるととも
に、チツプＣの切削面からの高さが低くなり且つ
全体的に保持されるから、切削部分の振動が極力
押えられるようになり、平滑な平面切削を可能と
する。 Further, the support rod A is manufactured in advance to a predetermined size, and is placed in the mounting groove 10 so that it can be pressed against the groove wall by the fixing screw, and the slanted contact surface at one end can be pressed between the groove wall and the cylinder 11. By entering in a wedge shape, firm fixation without wobbling is achieved, so accurate centering can be easily performed so that each tip C of each support rod A is positioned at the same distance from the center of the seat portion 8. In addition to ensuring an accurate cutting diameter, the height of the tip C from the cutting surface is lowered and is maintained as a whole, so vibrations in the cutting part are suppressed as much as possible, making it possible to cut smooth planes. possible.
さらに本発明の平面切削工具は、ホルダーＢの
座部８の中心又は中心と同心円上に円柱１１を配
設し、支持杆Ａに傾斜した接当面２を設けている
ため、ホルダーＢの中心とチツプＣとを結ぶ線よ
り後方で、支持杆Ａの接当面２が円柱１１に接当
し、切削時にチツプＣに加わる力を支持杆Ａ、ホ
ルダーＢに分散することができ、チツプＣに無理
な力が係らず、チツプＣの耐久性が向上し、又、
支持杆Ａも三本以上を支持することができる構成
とすることができるので多数の切削チツプＣによ
りきれいな切削面に仕上げることができる。 Further, in the flat cutting tool of the present invention, the cylinder 11 is arranged at the center of the seat part 8 of the holder B or on a concentric circle with the center, and the supporting rod A is provided with the inclined contact surface 2. The contact surface 2 of the support rod A comes into contact with the cylinder 11 behind the line connecting the chip C, and the force applied to the chip C during cutting can be dispersed to the support rod A and holder B, so that no force is applied to the chip C. The durability of Chip C is improved without applying strong force, and
Since the support rods A can also be configured to support three or more, a clean cut surface can be finished with a large number of cutting chips C.
第１図は本発明に係る切削工具の支持杆の平面
図、第２図は同正面図、第３図は第１図の−
線における断面図、第４図は該支持杆の頭部の一
部拡大断面図、第５図は本発明に係る切削工具の
ホルダーの表面図、第６図は第５図の−線に
おける断面図、第７図は本発明に係る切削工具の
一部切欠表面図、第８図は第７図の−線にお
ける端面図、第９図は本発明の切削工具の使用状
態の説明図、第１０図は本発明の他の実施例を示
す一部省略表面図である。
Ａ……支持杆、Ｂ……ホルダー、Ｃ……チツ
プ、１……杆部、２……接当面、３……係止孔、
４……傾斜面、５……頭部、６……止軸、７……
取付杆、８……座部、９……軸杆、１０……取付
溝、１１……円柱、１２……ボルト、１３……ネ
ジ孔、１４……固定ネジ、１５……切欠部、１６
……ボール、１７……チヤツク部、１８……段
壁、１９……軸溝、２０……リング、２１……軸
孔、２２……周溝。
Fig. 1 is a plan view of a support rod of a cutting tool according to the present invention, Fig. 2 is a front view thereof, and Fig. 3 is a - of Fig. 1.
4 is a partially enlarged sectional view of the head of the support rod, FIG. 5 is a surface view of the cutting tool holder according to the present invention, and FIG. 6 is a sectional view taken along the - line in FIG. 7 is a partially cutaway surface view of the cutting tool according to the present invention, FIG. 8 is an end view taken along the line - in FIG. 7, and FIG. FIG. 10 is a partially omitted surface view showing another embodiment of the present invention. A... Support rod, B... Holder, C... Chip, 1... Rod portion, 2... Contact surface, 3... Locking hole,
4... Inclined surface, 5... Head, 6... Stop shaft, 7...
Mounting rod, 8...Seat, 9...Shaft rod, 10...Mounting groove, 11...Cylinder, 12...Bolt, 13...Screw hole, 14...Fixing screw, 15...Notch, 16
...Ball, 17...Chuck portion, 18...Step wall, 19...Shaft groove, 20...Ring, 21...Shaft hole, 22...Peripheral groove.
Claims (1)
きるようにした平面切削工具を、所定サイズの三
本以上の支持杆Ａと、座部８の裏面中央に軸杆９
を突設したホルダーＢとから構成し、支持杆Ａ
は、一端を斜めの接当面２とし他端の頭部５にチ
ツプＣを固定した構成とし、該ホルダーＢは、座
部８の表面に三本以上の取付溝１０を放射状に設
けるとともに、該取付溝１０の交錯する中心若し
くは同心円上の取付溝１０に溝深さに納まる高さ
を有する円柱１１を固定し、取付溝１０の側壁に
は締付け座部の中心方向へ作用する固定ネジ１４
を設けた構成とし、前記各取付溝１０へ、一定サ
イズの支持杆Ａの斜めの接当面２を円柱１１に接
当した状態で嵌合して固定ネジ１４で固定するこ
とにより、各種サイズの支持杆Ａに交換固定でき
るようにしたことを特徴とする平面切削工具。1. A plane cutting tool that uses a common holder B and can change the cutting range diameter is attached to three or more support rods A of a predetermined size and a shaft rod 9 at the center of the back surface of the seat part 8.
It consists of a holder B with a protruding support rod A
The holder B has an oblique contact surface 2 at one end and a chip C fixed to the head 5 at the other end. A cylinder 11 having a height that fits within the depth of the groove is fixed to the mounting groove 10 on the center or concentric circles where the mounting grooves 10 intersect, and a fixing screw 14 is provided on the side wall of the mounting groove 10 that acts toward the center of the tightening seat.
By fitting the diagonal abutment surface 2 of a support rod A of a certain size into the respective mounting grooves 10 with it in contact with the cylinder 11 and fixing it with the fixing screw 14, various sizes of support rods A can be installed. A flat cutting tool characterized in that it can be exchanged and fixed to a support rod A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15449686A JPS62218014A (en) | 1986-06-30 | 1986-06-30 | Cutting tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15449686A JPS62218014A (en) | 1986-06-30 | 1986-06-30 | Cutting tool |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16213283A Division JPS6056813A (en) | 1983-09-03 | 1983-09-03 | Cutting tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62218014A JPS62218014A (en) | 1987-09-25 |
| JPH0211365B2 true JPH0211365B2 (en) | 1990-03-14 |
Family
ID=15585516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15449686A Granted JPS62218014A (en) | 1986-06-30 | 1986-06-30 | Cutting tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62218014A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5123436U (en) * | 1974-08-07 | 1976-02-20 |
-
1986
- 1986-06-30 JP JP15449686A patent/JPS62218014A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5123436U (en) * | 1974-08-07 | 1976-02-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62218014A (en) | 1987-09-25 |
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