JPH0711987B2 - Induction furnace construction method for molten metal - Google Patents
Induction furnace construction method for molten metalInfo
- Publication number
- JPH0711987B2 JPH0711987B2 JP61282101A JP28210186A JPH0711987B2 JP H0711987 B2 JPH0711987 B2 JP H0711987B2 JP 61282101 A JP61282101 A JP 61282101A JP 28210186 A JP28210186 A JP 28210186A JP H0711987 B2 JPH0711987 B2 JP H0711987B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- wall
- induction furnace
- insulating layer
- heat
- 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
- 230000006698 induction Effects 0.000 title claims description 40
- 229910052751 metal Inorganic materials 0.000 title claims description 30
- 239000002184 metal Substances 0.000 title claims description 30
- 238000010276 construction Methods 0.000 title description 8
- 239000011819 refractory material Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000010425 asbestos Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 229910052895 riebeckite Inorganic materials 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000009415 formwork Methods 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- General Induction Heating (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、溶湯用誘導炉の築造方法の改良に関する。TECHNICAL FIELD The present invention relates to an improvement in a method for constructing an induction furnace for molten metal.
従来の溶湯用誘導炉の内面は不定形粉末状耐火材を搗き
固めて焼結した一層のライニングで構成されていたが、
これは比較的に脆弱であるため、上記ライニングの溶湯
に接する表面は２〜３ケ月で熱膨張差により縦横にクラ
ックが生じると云う問題点があった。The inner surface of the conventional induction furnace for molten metal was composed of a single layer of lining made by sintering and solidifying amorphous powdery refractory material.
Since this is relatively fragile, there was a problem in that the surface of the lining in contact with the molten metal had cracks in the vertical and horizontal directions due to the difference in thermal expansion within 2-3 months.
クラックが大きくなると溶湯が上記クラックから入り込
み誘導コイル部分にまで達することになるが、上記誘導
コイルは特殊断面形状の銅管を巻いて形成し、銅管内に
冷却水を通しているので、溶湯が特にAl合金であるよう
な場合には、上記Al合金が上記クラックを通過して銅管
を溶かし管内の冷却水と接触し、水蒸気爆発が起り大事
故につながる可能性が大である為、ライニングの点検に
は最大限の注意を払う必要があった。When the crack becomes large, the molten metal enters from the crack and reaches the induction coil part, but the induction coil is formed by winding a copper tube with a special cross-sectional shape, and since cooling water is passed through the copper tube, the molten metal is particularly In the case of an Al alloy, the Al alloy passes through the cracks and melts the copper pipe and comes into contact with the cooling water in the pipe, and it is highly possible that a steam explosion will occur and lead to a major accident. The inspection required utmost care.
また、このライニング層を構築するためには、炉の内面
に型枠を設け、その型枠と誘導コイルの間に不定形粉末
状耐火材を充填し搗き固めた後、焼結を行ない、型枠を
取り外す必要があったので、築造に相当の手間とコスト
が掛かるという問題があった。Further, in order to construct this lining layer, a mold is provided on the inner surface of the furnace, and an amorphous powder refractory material is filled between the mold and the induction coil, and the mixture is roasted and solidified. Since it was necessary to remove the frame, there was a problem that it took considerable time and cost to build.
また、実願昭47-23677号（実開昭48-99934号）には、誘
導炉の強度を増大させるため、るつぼ状に形成した煉瓦
積層体の外周に不定形耐火物を充填することにより炉底
並びに断熱内壁を構成した誘導炉が開示されている。In addition, in Japanese Utility Model Application No. Sho 47-23677 (Actual No. Sho 48-99934), in order to increase the strength of the induction furnace, by filling the outer periphery of the crucible-shaped brick laminate with an amorphous refractory material, An induction furnace having a hearth bottom and a heat insulating inner wall is disclosed.
然しながら、この炉を築造する場合、炉壁及び炉底を煉
瓦で築造する前後に、それらの煉瓦積層体の外側に枠体
を設け、その煉瓦積層体と枠体との間に不定形耐火物を
充填した後、その外側に枠体を巻き、次いで更にその外
側に誘導コイルを配置するものである。即ち、この誘導
炉に於いても、炉の築造に特別な形枠を必要とするの
で、築造のため相当の手間とコストが掛かるという問題
は解決されていないものである。However, when building this furnace, before and after building the furnace wall and the bottom of the furnace with a brick, a frame is provided outside the brick laminate, and an irregular refractory material is placed between the brick laminate and the frame. After filling with, the frame is wound on the outer side, and then the induction coil is arranged on the outer side. That is, even in this induction furnace, since a special form is required for the construction of the furnace, the problem of considerable labor and cost for the construction has not been solved.
本発明は叙上の観点に立ってなされたものであって、そ
の目的とするところは、熱膨張差による悪影響及び事故
の発生をできる限り防止すると共に、築造のため型枠を
必要とせず、製作コスト及び時間等が従来の略半分で済
み、更には耐久性に富んだ溶湯用誘導炉を構築し得る方
法を提供することにある。The present invention has been made from the perspective of the above, and its purpose is to prevent adverse effects due to thermal expansion difference and the occurrence of accidents as much as possible, without requiring a formwork for construction, It is an object of the present invention to provide a method capable of constructing a molten metal induction furnace that requires only about half the manufacturing cost and time, and is highly durable.
上記の目的は、誘導コイルの内側に設けられた絶縁層
と、上記絶縁層より更に内側に適宜の間隔を隔てて設け
られた断熱内壁と、上記絶縁層と断熱内壁との間に充
填、焼結された粉末状耐火材層とを有する溶湯用誘導炉
を築造する方法において、 スリーブシンター、即ち、上記絶縁層と断熱内壁とを型
枠（スリーブ）とし、その間に粉末状耐火材を充填、突
き固め、次いで断熱内壁で囲まれた空間内に金属材料、
特に望ましくはアルミ合金のインゴットを装入し、誘導
コイルに通電して溶湯とし、その熱で粉末状耐火材を焼
結することにより、特別な築炉用の型枠を用いることな
く、上記の溶湯用誘導炉を築造することにより達成され
る。The above-mentioned object is to fill and burn the insulating layer provided inside the induction coil, the heat insulating inner wall provided at a proper distance further inside the insulating layer, and the insulating layer and the heat insulating inner wall. In a method of constructing a molten metal induction furnace having a powdery refractory material layer bound together, a sleeve sinter, that is, the insulating layer and the heat insulating inner wall are used as a formwork (sleeve), and a powdery refractory material is filled between them. Tamping, then metal material in the space surrounded by the heat insulating inner wall,
Particularly preferably, an ingot of an aluminum alloy is charged, the induction coil is energized to form a molten metal, and the heat of the powder sinters the powdered refractory material, without the use of a special formwork for furnace construction. It is achieved by building an induction furnace for molten metal.
なお、上記断熱内壁は、上下及び左右の側面に雌雄係合
部を有する炭化珪素と窒化珪素とから成るブロックを多
数組み上げることにより構築するようにすることが推奨
される。It is recommended that the heat insulating inner wall is constructed by assembling a large number of blocks made of silicon carbide and silicon nitride having male and female engaging portions on the upper, lower, left and right side surfaces.
叙上の如く構成することにより、特別な形枠を用いるこ
となく誘導炉を構築することができ、断熱内壁の耐熱性
を高めると共に、水蒸気爆発等の事故を未然に防止する
ことができ、製作コスト及び製作時間等を従来の略半分
に抑えることができる溶湯用誘導炉の築造方法を提供で
きるものである。By constructing as described above, it is possible to construct an induction furnace without using a special form, improve the heat resistance of the heat insulating inner wall, and prevent accidents such as steam explosions. It is possible to provide a method for constructing an induction furnace for molten metal, which can reduce the cost and production time to about half that of the conventional method.
以下、図面を参照しつゝ本発明の詳細を具体的に説明す
る。Hereinafter, details of the present invention will be specifically described with reference to the drawings.
第１図は本発明にかかる方法により築造される溶湯用誘
導炉の構成を示す説明図、第２図はその一部拡大説明
図、第３図は断熱内壁を構成するブロックの縦切断端面
図、第４図は上記ブロックの横切断端面図である。FIG. 1 is an explanatory view showing the structure of a molten metal induction furnace constructed by the method according to the present invention, FIG. 2 is a partially enlarged explanatory view thereof, and FIG. 3 is a vertical cut end view of a block constituting an adiabatic inner wall. FIG. 4 is a lateral cut end view of the block.
第１図ないし第４図中、１は溶湯用誘導炉であり、２は
誘導コイル、３はアスベスト板等を用いた絶縁層、４は
不定形粉末状の耐火材、５はブロック、5a、5c及び5b、
5dはそれぞれ上記ブロック５の雄及び雌の係合部、６は
炉床、７はアルミ等の溶湯である。1 to 4, 1 is an induction furnace for molten metal, 2 is an induction coil, 3 is an insulating layer using an asbestos plate or the like, 4 is an amorphous powder refractory material, 5 is a block, 5a, 5c and 5b,
5d are male and female engaging portions of the block 5, 6 is a hearth, and 7 is a molten metal such as aluminum.
而して、従来の溶湯用誘導炉のライニング材は、最初に
特殊断面形状の銅管を巻線して形成された誘導コイルの
内周面にアスベスト等により絶縁被覆を施した後、炉床
を形成し、当該炉床上に形枠を組み付け、誘導コイルと
形枠とによって形成された間隙内に炉壁ライニング材を
充填し、スタンプして突き固め、数時間形枠シンターし
後、形枠を取り去り、然る後、溶湯シンターをして通常
の溶解作業に入るものであった。Thus, the lining material for the conventional induction furnace for molten metal is that the inner peripheral surface of the induction coil formed by winding the copper tube with the special cross-section is first coated with insulating coating such as asbestos, and then the hearth. Form, assemble a frame on the hearth, fill the furnace wall lining material in the gap formed by the induction coil and the frame, stamp and tamper, sinter for several hours, then form the frame. After that, the melt sinter was carried out and the normal melting operation was started.
このような築造方法は、完成後に取り外されるべき形枠
をわざわざ構築する必要があり、手間がかかるばかりで
なく、築造された溶湯用誘導炉も、炉壁に付着した酸化
物などの清掃を定期的に行うと共に、この間の発生する
クラックの補修を行う必要がある。また、通常約３〜４
ケ月間使用するとクラックが大きくなり、ライニング材
の寿命が来るので炉張りをやり直さなければならないも
のであった。In such a building method, it is necessary to construct a formwork to be removed after completion, which is not only labor-intensive, but also the built-in molten metal induction furnace is regularly cleaned of oxides etc. adhering to the furnace wall. It is necessary to repair the cracks that occur during this time. Also, usually about 3-4
If it was used for a month, cracks would grow, and the life of the lining material would end up, so it was necessary to re-tighten the furnace.
これに対して、本発明にかかる築造方法は、溶湯用誘導
炉１の誘導コイル２の内側にアスベスト板等３による絶
縁層を設け、更にこの内側に適宜の間隔を隔て炭化珪素
と窒化珪素とを焼結して成形したブロック５による断熱
内壁を構築し、更に、上記アスベスト板等３による絶縁
層とブロック５による断熱内壁との間に不定形粉末状の
耐火材４を突き固めながら充填して焼結する、いわゆる
スリーブシンターを行なうことにより、溶湯用誘導炉１
が完成するものであるから、作業に無駄がなく、低コス
トで製造できるものである。On the other hand, in the construction method according to the present invention, an insulating layer made of asbestos plate 3 or the like is provided inside the induction coil 2 of the molten metal induction furnace 1, and silicon carbide and silicon nitride are provided inside the insulating layer with an appropriate interval. A heat-insulating inner wall of the block 5 formed by sintering is constructed, and further, an irregular-shaped powdery refractory material 4 is compacted and filled between the insulating layer of the asbestos plate 3 and the heat-insulating inner wall of the block 5. By performing so-called sleeve sintering, which is performed by sintering, an induction furnace for molten metal 1
Since it is completed, there is no waste of work and it can be manufactured at low cost.
而して、ブロック５の上下の側面にはそれぞれ半円形断
面の突条と溝とから成る雄及び雌の係合部5a及び5bが形
成されており、左右側面にもそれぞれ半円形断面の突条
と溝とから成る雄及び雌の係合部5c、5dが形成されてお
り、それぞれ一つのブロック５の雌係合部に、隣接する
ブロック５の雄係合部を嵌め込むことにより上下左右に
連続して係合させることができるように構成されてい
る。Thus, the upper and lower side surfaces of the block 5 are formed with male and female engaging portions 5a and 5b, each of which is composed of a projection and a groove having a semicircular cross section, and the left and right side surfaces have a semicircular cross section. Male and female engaging portions 5c, 5d consisting of a strip and a groove are formed, and by inserting the male engaging portions of the adjacent blocks 5 into the female engaging portions of one block 5, respectively It is configured to be continuously engageable with.
而して、ブロック５の結合の際には、雄雌の係合部5a、
5b、5c及び5dにメジになるバインダを塗って接着するの
で、特別に形枠を用いなくとも、これを形枠としてスリ
ーブシンターが可能となる上、炉内の熱膨張差によって
生じる膨張収縮が上記バインダによって吸収されるの
で、クラックの発生が最少限度に抑えられると共に、溶
湯７の浸込みが防止される。Thus, when the blocks 5 are joined, the male and female engaging portions 5a,
Since 5b, 5c, and 5d are coated with a binder that becomes a medium and adhered, it is possible to use sleeve sinter with this as a frame without using a special frame, and the expansion and contraction caused by the difference in thermal expansion in the furnace Since it is absorbed by the binder, the occurrence of cracks is suppressed to a minimum and the infiltration of the molten metal 7 is prevented.
また、溶湯用誘導炉１からアルミ合金等の溶湯７が洩
れ、ブロック５を通過してきた場合でも、不定形粉末状
の耐火材４が誘導コイル２への溶湯７の進入を防止する
ので、上記誘導コイル２の損傷を防止し得るものであ
る。Further, even if the molten metal 7 such as an aluminum alloy leaks from the molten metal induction furnace 1 and passes through the block 5, the irregular powdery refractory material 4 prevents the molten metal 7 from entering the induction coil 2. It is possible to prevent damage to the induction coil 2.
更にまた、ブロック５と不定形粉末状の耐火材４との二
層により断熱層が形成されるので、熱効率が従来のもの
と比較して向上する。Furthermore, since the heat insulating layer is formed by the two layers of the block 5 and the refractory material 4 in the form of irregular powder, the thermal efficiency is improved as compared with the conventional one.
而して、従来のライニング材の施工はドライスタンプの
ため炉床及び側壁面をスタンプする際に粉塵が発生する
と共に、スタンプ作業は作業員10人がバイブレータを使
用して約８時間かかると云う重労働であったが、本発明
に於ては、不定形粉末状の耐火材４の量が少なく、且つ
スタンプも軽くすればよいので、スタンプの回数も少な
くてすみ、そのため粉塵の発生も少なく、またブロック
の組立及び粉末状耐火材の充填後、スリーブシンターの
みで製作が完了するため、作業工数が軽減され、施工の
ためのコスト、作業員及び日数等も大幅に減少するもの
である。Since the conventional lining material is dry stamped, dust is generated when stamping the hearth and side wall surface, and it takes about 8 hours for 10 workers to use the vibrator to perform the stamping work. Although it was hard work, in the present invention, since the amount of the irregular-shaped powdery refractory material 4 is small and the stamp can be lightened, the number of stamps can be small, and therefore the generation of dust is small, Further, after the block is assembled and the powdery refractory material is filled, the production is completed only by the sleeve sinter, so that the work man-hours are reduced, and the cost for construction, the number of workers and the number of days are greatly reduced.
本発明は叙上の如く構成されるので、本発明によるとき
は、熱膨張差による断熱内壁の損傷の少ない溶湯用誘導
炉を、従来の略半分の製作コスト及び製作時間等で作製
することが可能な築造方法を提供することができる。Since the present invention is configured as described above, according to the present invention, it is possible to manufacture a molten metal induction furnace with less damage to the adiabatic inner wall due to the difference in thermal expansion at a manufacturing cost and manufacturing time that are about half those of the conventional method. A possible construction method can be provided.
第１図は本発明にかかる方法により築造される溶湯用誘
導炉の構成を示す説明図、第２図はその一部拡大説明
図、第３図は断熱内壁を構成するブロックの縦切断端面
図、第４図は上記ブロックの横切断端面図である。 １……溶湯用誘導炉 ２……誘導コイル ３……アスベスト板 ４……不定形粉末状の耐火材 ５……ブロック 5a、5c……雄係合部 5b、5d……雌係合部 ６……炉床 ７……溶湯FIG. 1 is an explanatory view showing the structure of a molten metal induction furnace constructed by the method according to the present invention, FIG. 2 is a partially enlarged explanatory view thereof, and FIG. 3 is a vertical cut end view of a block constituting an adiabatic inner wall. FIG. 4 is a lateral cut end view of the block. 1 ... Induction furnace for molten metal 2 ... Induction coil 3 ... Asbestos plate 4 ... Irregular powder refractory material 5 ... Blocks 5a, 5c ... Male engaging parts 5b, 5d ... Female engaging part 6 …… Hearth 7 …… Molten metal
Claims (2)
絶縁層より更に内側に適宜の間隔を隔てて設けられた断
熱内壁と、絶縁層と断熱内壁との間に充填、焼結された
粉末状耐火材層とを有する溶湯用誘導炉を築造する方法
に於いて、 誘導コイルの内側に絶縁層を設け、その絶縁層より更に
内側に適宜の間隔を隔てて断熱内壁を設け、絶縁層と断
熱内壁との間に粉末状耐火材を充填し、突き固め、次い
で断熱内壁で囲まれた空間内に金属材料を装入し、誘導
コイルに通電して溶湯とし、その熱で粉末状耐火材を焼
結することを特徴とする上記の溶湯用誘導炉築造方法。1. An insulating layer provided inside an induction coil,
A method for constructing an induction furnace for molten metal having an adiabatic inner wall provided further inside the insulating layer with an appropriate interval, and a powdery refractory layer filled and sintered between the insulating layer and the adiabatic inner wall. In this case, an insulating layer is provided inside the induction coil, and a heat-insulating inner wall is provided further inside the insulating coil with an appropriate distance. A powdery refractory material is filled between the insulating layer and the heat-insulating inner wall, and The above induction furnace for molten metal, characterized in that it is solidified and then charged with a metal material in a space surrounded by a heat-insulating inner wall, and an induction coil is energized to form a molten metal, and the powdered refractory material is sintered by the heat. How to build.
炭化珪素と窒化珪素とから成るブロックを多数積み上げ
ることにより上記断熱内壁を構築することを特徴とする
特許請求の範囲第１項記載の溶湯用誘導炉築造方法。2. The heat insulating inner wall is constructed by stacking a large number of blocks made of silicon carbide and silicon nitride having male and female engaging portions on the upper, lower, left and right side surfaces, respectively. Method for constructing induction furnace for molten metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61282101A JPH0711987B2 (en) | 1986-11-28 | 1986-11-28 | Induction furnace construction method for molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61282101A JPH0711987B2 (en) | 1986-11-28 | 1986-11-28 | Induction furnace construction method for molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63138688A JPS63138688A (en) | 1988-06-10 |
| JPH0711987B2 true JPH0711987B2 (en) | 1995-02-08 |
Family
ID=17648138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61282101A Expired - Lifetime JPH0711987B2 (en) | 1986-11-28 | 1986-11-28 | Induction furnace construction method for molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711987B2 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4899934U (en) * | 1972-02-25 | 1973-11-26 | ||
| JPS52136808A (en) * | 1976-05-11 | 1977-11-15 | Nippon Yakin Kogyo Co Ltd | Crucible for induction type electric furnace and crucible furnace |
| JPS567978A (en) * | 1979-06-30 | 1981-01-27 | Akio Nakano | Melting furnace |
| JPS5832310A (en) * | 1981-08-19 | 1983-02-25 | 株式会社フジクラ | Method of printing surface of wire, cable or like |
| JPS5952190A (en) * | 1982-09-20 | 1984-03-26 | 富士電機株式会社 | Detector for run-out from crucible type induction furnace |
| JPS5952187A (en) * | 1982-09-20 | 1984-03-26 | 富士電機株式会社 | Detector for run-out from crucible type induction furnace |
| JPS59122880A (en) * | 1982-12-28 | 1984-07-16 | 日本碍子株式会社 | Induction furnace |
| JPS61114489A (en) * | 1984-11-08 | 1986-06-02 | 日立化成工業株式会社 | Crucible for induction electric furnace |
| JPS61114486A (en) * | 1984-11-08 | 1986-06-02 | 松下電器産業株式会社 | Heat generating body having positive resistance temperature characteristic |
| JPS61181296U (en) * | 1985-04-30 | 1986-11-12 |
-
1986
- 1986-11-28 JP JP61282101A patent/JPH0711987B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63138688A (en) | 1988-06-10 |
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