JP2996441B2 - Manufacturing method of gear type dresser - Google Patents
Manufacturing method of gear type dresserInfo
- Publication number
- JP2996441B2 JP2996441B2 JP1074278A JP7427889A JP2996441B2 JP 2996441 B2 JP2996441 B2 JP 2996441B2 JP 1074278 A JP1074278 A JP 1074278A JP 7427889 A JP7427889 A JP 7427889A JP 2996441 B2 JP2996441 B2 JP 2996441B2
- Authority
- JP
- Japan
- Prior art keywords
- diamond abrasive
- mold
- abrasive grains
- gear
- dresser
- 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 - Fee Related
Links
Landscapes
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Description
【発明の詳細な説明】 ［発明の属する技術分野］ 高精度の歯車構造において、仕上げ加工に用いられる
酸化アルミ、炭化珪素等の焼成砥石を極めて高精度に整
形するため第１図に示す歯車型ドレッサを用いる。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] In a high-precision gear structure, a gear mold shown in FIG. 1 is used for shaping a sintering grindstone made of aluminum oxide, silicon carbide or the like, which is used for finishing, with extremely high precision. Use a dresser.
本発明はこの歯車型ドレッサの製造方法に関するもの
である。The present invention relates to a method for manufacturing the gear type dresser.
［従来の技術］ 従来の歯車型ドレッサは電着法により製作されてい
る。第２図にその一部断面を、第３図に歯拡大図を示
す。その製作法は所定寸法よりダイヤモンド砥粒の直径
分だけアンダーカットした歯車型台金１を製作し、その
外周歯面部にダイヤモンド砥粒２を電気めっき或いは無
電解めっきで付着させる方法を用いている。[Prior Art] A conventional gear type dresser is manufactured by an electrodeposition method. FIG. 2 shows a partial cross section, and FIG. 3 shows an enlarged view of the teeth. The manufacturing method uses a method in which a gear-type base metal 1 is produced by undercutting a predetermined size by the diameter of diamond abrasive grains, and diamond abrasive grains 2 are adhered to the outer peripheral tooth surface portion by electroplating or electroless plating. .
電着法で製作されたドレッサは、歯車型台金をいかに
高精度に加工、仕上げても付着させるダイヤモンド砥粒
の直径にはばらつきがあって、台金よりの高さ寸法を均
一にすることは困難である。そのためダイヤモンド砥粒
層の高さを一定に揃えるように、歯車研磨機を使用し、
歯面のダイヤモンド砥粒層をダイヤモンド砥石で研磨し
高さの修正を行っている。修正されたダイヤモンド砥粒
は先端が平になって、ドレッサの切れ味が劣化する。ま
た滑らかな歯形曲線に整形するために＃170程度の小さ
なダイヤモンド砥粒しか使用できない不利な点がある。
更に第３図のようにめっき皮膜の厚さが歯先部H1と歯元
部H2とでは大きな厚さの差（H1＞H2）となりダイヤモン
ド砥粒の保持力に差が見られる。一方製造技術上の問題
とは別に使用上の問題点として第３図の歯先エッジ部21
のダイヤモンド砥粒にかかる負荷は大きく砥粒の脱落や
めっき皮膜の剥離が起こっている。まためっき皮膜の厚
さ22の不均一による薄い部分でのダイヤモンド砥粒の脱
落が見られる。The dresser manufactured by the electrodeposition method, even if the gear type base metal is processed and finished with high accuracy, the diameter of the diamond abrasive to be attached varies, and the height dimension from the base metal must be uniform. It is difficult. Therefore, use a gear grinder to make the height of the diamond abrasive layer uniform,
The diamond abrasive layer on the tooth surface is polished with a diamond grindstone to correct the height. The modified diamond abrasive has a flattened tip, which degrades the sharpness of the dresser. In addition, there is a disadvantage that only a small diamond abrasive of about # 170 can be used for shaping into a smooth tooth profile curve.
Further, as shown in FIG. 3, the thickness of the plating film is large (H 1 > H 2 ) between the tooth tip portion H 1 and the tooth root portion H 2, and there is a difference in the holding force of the diamond abrasive grains. . On the other hand, apart from the problem in the manufacturing technology, there is a problem in use as shown in FIG.
The load applied to the diamond abrasive grains is large, causing the abrasive grains to fall off and the plating film to peel off. In addition, the diamond abrasive grains fall off in thin portions due to the unevenness of the plating film thickness 22.
［発明が解決しようとする課題］ 本発明の課題は、精度不足、或いはその精度不足を補
うための研磨による工数増加、ダイヤモンド砥粒の磨
滅、そのための切れ味低下、更にはめっき厚のばらつき
によるダイヤモンド砥粒の保持力不足、脱落など電着法
に起因する多くの不具合点を解決する新規の製造法を提
供することにある。[Problems to be Solved by the Invention] Problems to be solved by the present invention are insufficient precision, or an increase in man-hours by polishing to compensate for the lack of precision, abrasion of diamond abrasive grains, reduction in sharpness therefor, and diamond due to variation in plating thickness. It is an object of the present invention to provide a novel manufacturing method that solves many problems caused by the electrodeposition method, such as insufficient holding force of abrasive grains and falling off.
［課題を解決するための手段］ 本発明の手段は次のとおりである。[Means for Solving the Problems] The means of the present invention are as follows.
所定の寸法、形状に仕上げた低熱膨張合金製の歯車を
母型とし、母型の歯面外周部に電鋳法、又は低融点合金
を用いた鋳造法、樹脂成型法等によって、母型より大き
い熱膨張を有する反転型を製作し、反転型の内面にダイ
ヤモンド砥粒を付着させ、ダイヤモンド砥粒を付着させ
た面の内面を電鋳法、鋳造法、樹脂成型法のいずれかの
方法で充填してダイヤモンド砥粒を埋込み、しかる後芯
金とダイヤモンド砥粒層の間に低融点合金、樹脂等の充
填物を流し込み反転型の外径を基準として芯出しを行
い、軸穴、端面を仕上げた後、外側の反転型を取り除い
た歯車型ドレッサの製造方法。A gear made of a low-thermal-expansion alloy finished to a predetermined size and shape is used as a matrix, and an electroforming method or a casting method using a low-melting-point alloy on the tooth surface outer periphery of the matrix, a resin molding method, etc. Manufacture an inversion mold with large thermal expansion, attach diamond abrasive grains to the inner surface of the inversion mold, and electrocast, cast, or resin mold the inner surface of the surface where the diamond abrasive grains are attached. Fill and embed diamond abrasive grains, and then pouring a filler such as low melting point alloy and resin between core metal and diamond abrasive layer, centering based on the outside diameter of the reversing mold, and align the shaft hole and end face. A method of manufacturing a gear-type dresser in which the outer reversing mold is removed after finishing.
［発明の実施の形態］ 以下本発明の製造方法を外径平歯車型ドレッサを例と
して説明する。[Embodiment of the Invention] Hereinafter, the manufacturing method of the present invention will be described using an outer diameter spur gear type dresser as an example.
先ず第４図において基準の歯車母型４を低熱膨張の材
料で作り、その外周歯面に電鋳、鋳造或いは樹脂成型等
で、厚肉リング状の反転型３を形成する。次に歯車母型
４と反転型３の内面５にダイヤモンド砥粒２を密着さ
せ、型の内側から電鋳、鋳造或いは樹脂成型等でダイヤ
モンド砥粒を埋め込み、ダイヤモンド砥粒層６を形成す
る。ダイヤモンド砥粒層６の中心に芯金７を立て、低融
点合金の鋳造、樹脂成型等の方法８にてダイヤモンド砥
粒層６と芯金７とを接合する。次に反転型３の外径を基
準として芯出しを行い軸穴９、端面10の順に加工、仕上
げを行い、しかる後次いで軸穴９にマンドレルを通し外
側の反転型３を研削等の方法で除去しダイヤモンド砥粒
層６を露出させ、第７図の歯車型ドレッサが完成する。First, in FIG. 4, a reference gear matrix 4 is made of a material having low thermal expansion, and a thick ring-shaped inversion mold 3 is formed on its outer peripheral tooth surface by electroforming, casting, or resin molding. Next, the diamond abrasive grains 2 are brought into close contact with the inner surface 5 of the gear mold 4 and the reverse mold 3, and the diamond abrasive grains are embedded from the inside of the mold by electroforming, casting, resin molding, or the like to form a diamond abrasive grain layer 6. A core metal 7 is set up at the center of the diamond abrasive grain layer 6, and the diamond abrasive grain layer 6 and the core metal 7 are joined by a method 8 such as casting of a low melting point alloy or resin molding. Next, centering is performed on the basis of the outer diameter of the reversing die 3, machining and finishing are performed in the order of the shaft hole 9 and the end face 10, and then the mandrel is passed through the shaft hole 9 to grind the outer reversing die 3 by a method such as grinding. This removes the diamond abrasive layer 6 to complete the gear dresser shown in FIG.
［実 施 例］ （実施例１） インボリュート歯形、モジュール2.5、圧力角20゜、
歯数20枚、外径55mmの仕様の平歯車用ドレッサの製造法
について第４図以降を用いて説明する。先ず低熱膨張材
の鉄系インバーで上記仕様の基準歯車を造り母型４とし
た。歯車外周面に高速ニッケルめっきを施し肉厚約5mm
のリング状電鋳反転型３を造った。次いで反転型３と母
型（鉄系インバー；熱膨張係数２×10-6）と電鋳反転型
（ニッケル；熱膨張係数12.8×10-6）との熱膨張差を利
用して剥離させた。第５図の電鋳反転型３の内面５に＃
40のダイヤモンド砥粒を密着させ、型の内側からニッケ
ルめっきによりダイヤモンド砥粒を埋め込んでいき厚さ
約3mmの電鋳ダイヤモンド層６を形成した。次に第６図
電鋳ダイヤモンド層６の中心部に鉄芯金７（炭素鋼S45
C）を立て、第８図のように治具11上に組み立て、治具
と共に約150℃の炉中に入れ約30分加熱保持した。一方
電鋳ダイヤモンド層６と鉄芯金７との隙間を埋める金属
として錫系低融点合金８（18％錫−鉛）を約180℃に加
熱溶融し、第８図の湯口12から流し込み電鋳ダイヤモン
ド層６と鉄芯金７を接合させた。電鋳反転型３の外径を
基準として芯出しを行い軸穴９、端面10の順で加工、仕
上げた。次いで軸穴９にマンドレルを通し外側の電鋳反
転型３を研削除去し、ダイヤモンド砥粒層６を露出させ
第７図に示す歯車型ドレッサが完成した。完成したドレ
ッサのオーバーピン径DBを測定した。測定法を第９図に
示す。比較のため電鋳法ドレッサの測定値と共に第１表
に示す。オーバーピン径DBの計算値はピン径4.50mmのオ
ーバーピン13を使用した場合56.58mmとなる。尚電着法
のものは＃170のダイヤモンド砥粒が使用されている。[Example] (Example 1) Involute tooth profile, module 2.5, pressure angle 20 °,
A method of manufacturing a dresser for a spur gear having 20 teeth and an outer diameter of 55 mm will be described with reference to FIGS. First, a reference gear having the above-mentioned specification was made of iron-based invar, a low thermal expansion material, to obtain a mother die 4. High-speed nickel plating is applied to the outer peripheral surface of the gear, and the thickness is about 5 mm
Was produced. Subsequently, peeling was performed using the difference in thermal expansion between the reversing mold 3 and the matrix (iron-based invar; coefficient of thermal expansion 2 × 10 −6 ) and the electroformed reversing mold (nickel; coefficient of thermal expansion 12.8 × 10 −6 ). . The inner surface 5 of the electroformed reverse mold 3 shown in FIG.
Forty diamond abrasive grains were brought into close contact with each other, and the diamond abrasive grains were embedded from the inside of the mold by nickel plating to form an electroformed diamond layer 6 having a thickness of about 3 mm. Next, in the center of the electroformed diamond layer 6 shown in FIG.
C) was set up, assembled on a jig 11 as shown in FIG. 8, placed in a furnace at about 150 ° C. together with the jig, and heated and held for about 30 minutes. On the other hand, a tin-based low melting point alloy 8 (18% tin-lead) as a metal for filling the gap between the electroformed diamond layer 6 and the iron core metal 7 is heated and melted at about 180 ° C. and poured from the gate 12 shown in FIG. The diamond layer 6 and the iron core 7 were joined. Centering was performed with the outer diameter of the electroformed reverse mold 3 as a reference, and the shaft hole 9 and the end face 10 were processed and finished in this order. Next, the mandrel was passed through the shaft hole 9 to remove the outer electroformed reverse mold 3 by grinding, thereby exposing the diamond abrasive layer 6 to complete the gear dresser shown in FIG. The overpin diameter DB of the completed dresser was measured. The measurement method is shown in FIG. For comparison, Table 1 shows the measured values of the electroformed dresser. The calculated value of the overpin diameter DB is 56.58 mm when the overpin 13 having the pin diameter of 4.50 mm is used. In the case of the electrodeposition method, diamond abrasive grains of # 170 are used.
電着法のオーバーピン径DBのばらつき0.41mmに対し本
発明によるもののばらつきは0.09mmと精度が向上してい
る。更に第10図は歯車試験機により歯面（ダイヤモンド
面）の凹凸を測定したものであり第11図に示される測定
方向14で両者を比較すると電着法のものはダイヤモンド
の先端が0.012〜0.013mmと不揃いであり、一方本発明の
方法によるものは0.004〜0.005mmと良く揃っている。従
って本発明のものによる砥石の成形の結果は電着法のも
のによるより精度良く仕上げることができた。 The variation according to the present invention is 0.09 mm, which is an improvement in accuracy, with the variation of the overpin diameter DB of the electrodeposition method being 0.41 mm. Further, FIG. 10 shows the results of measurement of the unevenness of the tooth surface (diamond surface) using a gear tester. When the two are compared in the measurement direction 14 shown in FIG. 11, the electrodeposition method shows that the tip of the diamond is 0.012 to 0.013. mm, while those according to the method of the present invention are well aligned with 0.004 to 0.005 mm. Therefore, the result of the forming of the grindstone according to the present invention could be finished with higher precision than that of the electrodeposition method.
［発明の効果］ 本発明の方法で電着法の不利とされている点が大巾に
改善された。第一にはダイヤモンド砥粒径のばらつきが
あっても所定の寸法に揃えることができ、歯面の修正研
磨が不要となり、従ってダイヤモンド砥粒の磨滅による
切れ味の低下も無くなる。第二の問題点のダイヤモンド
砥粒の脱落に関してはダイヤモンド砥粒径が電着法の＃
170より大きい＃40を埋め込むことができ、砥粒の保持
層も２〜3mmと厚くでき、保持力が強力となって脱落の
心配も無くなった。また歯先のエッジ21の砥粒は歯面の
砥粒より１〜２段階大きいものを使用し脱落防止と同時
に耐摩耗性を向上させることができた。第三に母型は再
使用が可能であるから一定品質のものが繰返し生産でき
るようになった。切れ味低下の防止、砥粒の脱落防止に
よりドレッサの寿命の大巾アップが達成され変形量が少
なく、高精度な歯車型ドレッサが得られる。[Effects of the Invention] The disadvantages of the electrodeposition method in the method of the present invention have been greatly improved. First, even if there is a variation in the diameter of the diamond abrasive, the diameter can be adjusted to a predetermined size, and it is not necessary to correct and polish the tooth surface, so that the sharpness due to the wear of the diamond abrasive is not reduced. Regarding the second problem of falling off of diamond abrasive grains, the diamond abrasive grain
# 40 larger than 170 could be embedded, and the abrasive grain retaining layer could be made as thick as 2 to 3 mm, so that the retaining force was strong and there was no fear of falling off. The abrasive grains at the edge 21 of the tooth tip were larger than the abrasive grains at the tooth surface by one or two steps, so that they could be prevented from falling off and the wear resistance could be improved. Thirdly, since the master mold can be reused, products of a certain quality can be repeatedly produced. By preventing the sharpness from dropping and preventing the abrasive grains from dropping, the life of the dresser is greatly increased, and the amount of deformation is small, so that a highly accurate gear dresser can be obtained.
特に本発明の方法は反転型を付けたまま、反転型の最
外周を基準として芯出し、軸、穴加工を行ない、その後
に反転型を取外すので、一度反転型から取り出した後に
芯出し、軸、穴加工を行なう従来法のように、工具の中
心決めの精度が狂うことなく、極めて優れた精度の工具
ができる効果を奏し、更に本発明においては、母型とし
て低熱膨張合金を用いるため、製造過程中に熱による変
形を抑え、精度の低下を防ぎ、母型の精度が後の工程の
全ての精度を支配し、前記した反転型を取外す前に芯出
し、軸、穴加工を行なうことによる効果と相俟って一層
精度の高い工具を製造することができる。これに加え芯
金とダイヤモンド砥粒層の間に低融点合金、樹脂等の充
填物を流し込むようにしてあるから、低温で芯金と砥粒
層を接合できる。従って熱による歪みが生じない利点も
保有する。In particular, the method of the present invention, with the reversing die attached, centering on the outermost periphery of the reversing die as a reference, performing a shaft, drilling holes, and then removing the reversing die. As in the conventional method of performing hole drilling, the accuracy of centering of the tool is not deviated, and an effect that a tool with extremely excellent accuracy can be achieved.In the present invention, since a low thermal expansion alloy is used as a matrix, Suppress deformation due to heat during the manufacturing process, prevent deterioration of accuracy, the accuracy of the master mold controls all the accuracy of the subsequent process, and perform centering, shaft, and hole machining before removing the above-mentioned inverted mold In combination with the effect of the above, a tool with higher accuracy can be manufactured. In addition, since a filler such as a low melting point alloy or a resin is poured between the core metal and the diamond abrasive layer, the core metal and the abrasive layer can be joined at a low temperature. Therefore, there is an advantage that distortion due to heat does not occur.
第１図は歯車型ドレッサの断面図、第２図は電着法歯車
型ドレッサの断面図、第３図電着法歯車型ドレッサの一
部拡大断面図、第４図乃至第７図は本発明に係る歯車型
ドレッサ製造方法順序を示す横断面図、第８図は第７図
の縦断正面図、第９図はオーバーピン径の測定説明図、
第10図は歯車試験機による歯面の凹突測定グラフ、第11
図は歯面測定方向を示す斜視図である。 ３……反転型、４……歯車母型、５……反転型内面、６
……ダイヤモンド砥粒層、７……芯金、８……接合材、
９……軸穴FIG. 1 is a cross-sectional view of a gear type dresser, FIG. 2 is a cross-sectional view of an electrodeposition gear type dresser, FIG. 3 is a partially enlarged cross-sectional view of the electrodeposition gear type dresser, and FIGS. FIG. 8 is a cross-sectional view showing a gear-type dresser manufacturing method sequence according to the present invention, FIG. 8 is a vertical sectional front view of FIG. 7, FIG.
FIG. 10 is a graph showing the measurement of the tooth dent of a tooth surface using a gear testing machine, and FIG.
The figure is a perspective view showing the tooth surface measurement direction. 3 ... reversing type, 4 ... gear matrix type, 5 ... reversing type inner surface, 6
... diamond abrasive layer, 7 ... core metal, 8 ... bonding material,
9 ... Shaft hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大串 守 神奈川県川崎市高津区久地185 旭ダイ ヤモンド工業株式会社玉川工場内 (56)参考文献 特開 昭58−90465（ＪＰ，Ａ) 特開 昭58−56768（ＪＰ，Ａ) 特開 昭63−238294（ＪＰ，Ａ) 特開 昭62−34648（ＪＰ，Ａ) 特開 昭59−73932（ＪＰ，Ａ) 特公 昭46−24949（ＪＰ，Ｂ２) 特公 昭59−11380（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) B24B 53/075 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Mamoru Ogushi 185 Kuji, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Diamond Co., Ltd. Tamagawa Plant Co., Ltd. (56) References JP-A-58-90465 (JP, A) JP-A Sho 58-56768 (JP, A) JP-A-63-238294 (JP, A) JP-A-62-34648 (JP, A) JP-A-59-73932 (JP, A) JP-B-46-24949 (JP, A) B2) Japanese Patent Publication No. 59-11380 (JP, B2) (58) Field surveyed (Int. Cl. 6 , DB name) B24B 53/075
Claims (1)
製の歯車を母型とし、母型の歯面外周部に電鋳法、又は
低融点合金を用いた鋳造法、樹脂成型法等によって、母
型より大きい熱膨張を有する反転型を製作し、反転型の
内面にダイヤモンド砥粒を付着させ、ダイヤモンド砥粒
を付着させた面の内面を電鋳法、鋳造法、樹脂成型法の
いずれかの方法で充填してダイヤモンド砥粒を埋込み、
しかる後芯金とダイヤモンド砥粒層の間に低融点合金、
樹脂等の充填物を流し込み反転型の外径を基準として芯
出しを行い、軸穴、端面を仕上げた後、外側の反転型を
取り除いた歯車型ドレッサの製造方法。1. A gear made of a low-thermal-expansion alloy finished in a predetermined size and shape is used as a matrix, and an electroforming method, a casting method using a low-melting-point alloy, a resin molding method, etc. are applied to the outer peripheral surface of the tooth surface of the matrix. In this way, a reverse mold having a thermal expansion larger than that of the master mold is manufactured, diamond abrasive grains are adhered to the inner surface of the reverse mold, and the inner surface of the surface on which the diamond abrasive grains are adhered is formed by electroforming, casting, or resin molding. Fill with any method and embed diamond abrasive grains,
After that, a low melting point alloy between the core metal and the diamond abrasive layer,
A method of manufacturing a gear-type dresser in which a filler such as resin is poured, the centering is performed based on the outer diameter of the reversing mold, the shaft hole and the end face are finished, and the outer reversing mold is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1074278A JP2996441B2 (en) | 1989-03-27 | 1989-03-27 | Manufacturing method of gear type dresser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1074278A JP2996441B2 (en) | 1989-03-27 | 1989-03-27 | Manufacturing method of gear type dresser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02256464A JPH02256464A (en) | 1990-10-17 |
| JP2996441B2 true JP2996441B2 (en) | 1999-12-27 |
Family
ID=13542483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1074278A Expired - Fee Related JP2996441B2 (en) | 1989-03-27 | 1989-03-27 | Manufacturing method of gear type dresser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2996441B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0537456U (en) * | 1991-10-24 | 1993-05-21 | 本田技研工業株式会社 | Gear type dresser for grinding wheel |
| JP4781358B2 (en) * | 2005-06-27 | 2011-09-28 | 株式会社アライドマテリアル | Diamond rotary dresser for gears and truing and dressing method of gear grinding wheel using the same |
| JP2010089189A (en) * | 2008-10-06 | 2010-04-22 | Mitsubishi Materials Corp | Method for manufacturing internal gear type electrodeposited tool and internal gear type electrodeposited tool |
| DE102009059201B4 (en) * | 2009-12-17 | 2012-02-02 | Reishauer Ag | Solid profile roller for dressing multi-start cylindrical grinding worms |
| DE102016014180B4 (en) * | 2016-11-28 | 2018-10-11 | KAPP Werkzeugmaschinen GmbH | Method for dressing a grinding worm by means of a dressing roll and dressing roll |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5856768A (en) * | 1981-09-25 | 1983-04-04 | Osaka Daiyamondo Kogyo Kk | Manufacturing method for rotary dressor |
| JPS5890465A (en) * | 1981-11-13 | 1983-05-30 | Osaka Daiyamondo Kogyo Kk | Method of producing rotary dresser |
-
1989
- 1989-03-27 JP JP1074278A patent/JP2996441B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02256464A (en) | 1990-10-17 |
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