JPH052417B2 - - Google Patents
Info
- Publication number
- JPH052417B2 JPH052417B2 JP3540984A JP3540984A JPH052417B2 JP H052417 B2 JPH052417 B2 JP H052417B2 JP 3540984 A JP3540984 A JP 3540984A JP 3540984 A JP3540984 A JP 3540984A JP H052417 B2 JPH052417 B2 JP H052417B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- casting
- molten metal
- container
- flow
- 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
- 239000002184 metal Substances 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000009749 continuous casting Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 230000001360 synchronised effect Effects 0.000 description 5
- 239000011819 refractory material Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
本発明は、回転同期鋳型を用いて溶湯特に溶鋼
から幅広薄板を直接的に連続鋳造する装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for directly and continuously casting a wide thin plate from molten metal, particularly molten steel, using a rotationally synchronous mold.
鋼の連続鋳造において、従来の厚手のスラブに
代えて幅広薄板を直接的に鋳造で製造しようとす
る提案がなされている。例えば、双ロールまたは
双ベルトから回転同期鋳型を使用して溶鋼から薄
板を直接製造しようとする発明が、特開昭55−
75862号、特開昭57−9566号、特開昭58−32548号
および特開昭58−32551号公報などに記載されて
いる。これらの基本原理は、鋳片の厚みに相当す
る所定の間隙をあけて対向配置され且つ互いに反
対方向に同期回転する一対の冷却された鋳造ロー
ル（または鋳造ベルト）によつて形成される表面
移動鋳型と、この表面移動鋳型の上に設置される
湯溜り容器と、この湯溜り容器に溶湯を供給する
タンデツシユとを備えており、湯溜り容器内に注
入された溶湯は表面移動鋳型の回転につれて凝固
しながらこの表面移動鋳型の間隙から下方に引き
抜かれるようにするものである。 In continuous steel casting, proposals have been made to manufacture wide thin plates directly by casting instead of conventional thick slabs. For example, an invention for directly manufacturing thin plates from molten steel using a rotary synchronous mold from twin rolls or twin belts was published in JP-A-55-
75862, JP-A-57-9566, JP-A-58-32548, and JP-A-58-32551. The basic principle of these is the surface movement formed by a pair of cooled casting rolls (or casting belts) that are placed opposite each other with a predetermined gap corresponding to the thickness of the slab and rotate synchronously in opposite directions. It is equipped with a mold, a tundish that supplies molten metal to the tundish container, and a tundish that is placed on top of the surface-moving mold. While solidifying, it is pulled out downward from the gap in the surface moving mold.
かような回転同期鋳型によつて薄板の連続鋳造
を実現するには種々の問題があるが、そのうち、
湯溜り容器内での溶鋼の流動に基づく局部的な不
均一凝固、鋳片の幅方向の冷却速度の不均一に基
づく凝固シエル厚みの変動、さらには湯の流動に
基づく非金属介在物の差し込みによる鋳片品質の
劣化等、は解決されねばならない基本的な問題で
ある。 There are various problems in realizing continuous casting of thin plates using such a rotary synchronous mold, but among them,
Local non-uniform solidification due to the flow of molten steel in the molten metal tank, fluctuations in the thickness of the solidified shell due to non-uniform cooling rates in the width direction of the slab, and even the insertion of non-metallic inclusions due to the flow of the molten metal. The deterioration of slab quality due to this is a fundamental problem that must be solved.
湯溜り容器内での溶鋼の流動や鋳片幅方向の冷
却速度差を極力少なくするには、鋳型内で出来る
だけ大きな溶鋼プールを作るのが有効なようでは
あるが、この溶鋼プールを大きくするために湯溜
り容器の底面積を拡げると（鋳片の厚み方向に拡
げると）、冷却されている表面移動鋳型と接する
溶鋼の面積がそれだけ増大することから凝固が過
剰に進行するおそれがあり、鋳片の引抜きが困難
になつたり表面品質の劣化の原因を誘発すること
になるし、また、溶鋼プールを大きくするために
湯溜り容器の高さを高くすると、溶鋼の静圧の増
大により表面移動鋳型とこの上に設置される湯溜
り容器との間隙（移動する鋳型表面と固定される
湯溜り容器の底部との間の間隙）からの洩鋼の問
題が生じたり、またこの間隙への湯の差し込みな
どによる湯しわの発生や板厚の不均一を誘発する
ことになる。 It seems effective to create as large a molten steel pool as possible in the mold in order to minimize the flow of molten steel in the molten steel container and the cooling rate difference in the width direction of the slab. Therefore, if the bottom area of the molten steel is expanded (increased in the thickness direction of the slab), the area of the molten steel in contact with the cooling surface-moving mold increases accordingly, which may lead to excessive solidification. This will make it difficult to pull out the slab and cause deterioration of the surface quality.Also, if the height of the molten steel pool is increased to increase the size of the molten steel pool, the static pressure of the molten steel will increase and the surface quality will deteriorate. Problems may arise due to leakage of steel from the gap between the moving mold and the sump container installed above it (the gap between the surface of the moving mold and the bottom of the fixed sump container), and leakage of steel into this gap. Inserting hot water can cause wrinkles and uneven board thickness.
このようなことはまた、溶鋼の注入温度とも密
接な関係を有し、その管理等も重要な要素となつ
て、この装置の設計とその運転には細心の考慮が
払われねばならない。それだけこの回転同期鋳型
による連続鋳造装置の操業は技術的に困難な問題
を抱えていると言えるが、鋳型に注入される湯の
流動の問題が解決されかつ鋳型に向かう湯の流れ
が整流化されれば、前述のような問題はその基本
において解決できると言えるし、湯の流動に伴う
凝固シエルへの非金属介在物の補足の問題も解決
されることになるであろう。 This also has a close relationship with the injection temperature of molten steel, and its management is an important factor, so careful consideration must be given to the design and operation of this equipment. Although it can be said that the operation of continuous casting equipment using rotary synchronous molds is technically difficult, the problem of the flow of hot water injected into the mold has been solved and the flow of hot metal toward the mold has been rectified. If so, it can be said that the above-mentioned problems can be fundamentally solved, and the problem of non-metallic inclusions being trapped in the solidified shell due to the flow of hot water will also be solved.
本発明は、かような問題の解決を目的としたも
のである。この目的を極めて効果的に達成する装
置として、本発明は、図面の実施例に示したよう
に、鋳片の厚みに相当する所定の間隔をあけて対
向配置された一対の鋳造ロールまたは鋳造ベルト
によつて形成される表面移動鋳型１ａ，１ｂと、
この表面移動鋳型１ａ，１ｂの上に形成される湯
溜り容器２と、この湯溜り容器２内に溶湯を導く
注入ノズル３と、を備えた薄板連続鋳造装置にお
いて、湯溜り容器２の内部に多孔質耐火物からな
るフイルター４を取付け、注入ノズル３から湯溜
り容器２内に導入された溶湯が該フイルター４を
通過した後に凝固するようにした薄板連続鋳造装
置を提供するものである。以下に図面に基づいて
本発明装置を具体的に説明する。 The present invention aims to solve such problems. As a device for achieving this object very effectively, the present invention provides a pair of casting rolls or casting belts that are arranged opposite to each other with a predetermined interval corresponding to the thickness of the slab, as shown in the embodiment of the drawings. surface moving molds 1a and 1b formed by;
In a thin plate continuous casting apparatus equipped with a molten metal reservoir 2 formed on the surface moving molds 1a and 1b and an injection nozzle 3 for introducing molten metal into the molten metal reservoir 2, the inside of the molten metal reservoir 2 is To provide a thin plate continuous casting device in which a filter 4 made of a porous refractory is attached, and the molten metal introduced from an injection nozzle 3 into a sump container 2 is solidified after passing through the filter 4. The apparatus of the present invention will be specifically explained below based on the drawings.
第１図は、表面移動鋳型として双ロールを用い
た本発明装置の例を示す略断面図であり、表面移
動鋳型１ａ，１ｂは、鋳造される薄板鋳片５の厚
みに相当する間隙をあけて対向配置され、表面が
連続冷却される互いに反対方向に同期回転する一
対のロールからなつている。この表面移動鋳型１
ａ，１ｂの上には、第２図にその概略を示すよう
な湯溜り容器２がセツトされる。この湯溜り容器
２は、ロールの軸と実質上平行な側壁６ａ，６ｂ
と、ロールの軸と直行する側壁７ａ，７ｂとによ
つて囲われる容器である。側壁６ａ，６ｂは、こ
れから鋳造部に向かおうとしている表面移動鋳型
１ａ，１ｂの上に、その表面移動鋳型１ａ，１ｂ
の移動方向とは直行する方向に配置される。一
方、側壁７ａ，７ｂは鋳片５の幅を規制する壁と
なる。この湯溜り容器２には、その上方に設置さ
れたタンデシユ８から注入ノズル３によつて溶湯
が注入される。 FIG. 1 is a schematic cross-sectional view showing an example of the apparatus of the present invention using twin rolls as surface-moving molds. It consists of a pair of rolls that rotate synchronously in opposite directions and are placed opposite each other and whose surfaces are continuously cooled. This surface moving mold 1
A hot water reservoir 2 as schematically shown in FIG. 2 is set above a and 1b. This sump vessel 2 has side walls 6a, 6b substantially parallel to the axis of the rolls.
and side walls 7a, 7b perpendicular to the roll axis. The side walls 6a, 6b are placed on top of the surface moving molds 1a, 1b which are about to head to the casting section.
is arranged in a direction perpendicular to the direction of movement. On the other hand, the side walls 7a and 7b serve as walls for regulating the width of the slab 5. Molten metal is injected into the tundish container 2 by an injection nozzle 3 from a tundish 8 installed above the tundish.
本発明装置は、この湯溜り容器２の内部に多孔
質耐火物からなるフイルター４を取付けたことに
特徴がある。すなわち、注入ノズル３から湯溜り
容器２内に注入される溶湯がこのフイルター４を
通過してから表面移動鋳型１ａ，１ｂの表面に向
けて流れるようにするのである。このフイルター
４はAl2O3、SiO2、MgOなどの材質からなる耐
火物で構成され、湯がその中を通過できる孔を多
数設けてある。この多孔質耐火物製フイルター４
の全体の形状としては、例えば第３図に示すよう
な板状体のものとし、湯溜り容器２の内周に周接
するような外径としてこれを第１図のように湯溜
り容器２の中腹に水平方向に張り渡すようにす
る。すなわち、湯溜り容器２の内部をこの多孔質
耐火物製フイルター４によつて上下に２分割し、
上方の空間に注入ノズル３の先端を向かわせるよ
うにする。これによつて、湯溜り容器２内の湯面
レベルを多孔質耐火物製フイルター４より上方に
位置させるような鋳造条件で鋳造を実施すると、
注入ノズル３から湯溜り容器２内に注入される溶
湯は常にこのフイルター４を通過してから表面移
動鋳型１ａ，１ｂの表面に向けて流れるようにな
る。 The device of the present invention is characterized in that a filter 4 made of porous refractory material is attached inside the water reservoir container 2. That is, the molten metal injected from the injection nozzle 3 into the sump container 2 passes through the filter 4 and then flows toward the surfaces of the surface-moving molds 1a and 1b. The filter 4 is made of a refractory material such as Al 2 O 3 , SiO 2 , MgO, etc., and has many holes through which hot water can pass. This porous refractory filter 4
For example, the overall shape of the body is a plate-like body as shown in FIG. Make sure to stretch it horizontally down the middle. That is, the interior of the hot water reservoir 2 is divided into upper and lower halves by this porous refractory filter 4,
The tip of the injection nozzle 3 is directed toward the upper space. As a result, when casting is performed under casting conditions such that the level of the hot water in the hot water reservoir 2 is located above the porous refractory filter 4,
The molten metal injected from the injection nozzle 3 into the sump container 2 always passes through this filter 4 before flowing toward the surfaces of the surface-moving molds 1a, 1b.
本発明装置はこのような多孔質耐火物製フイル
ター４を用いるという非常に簡易な処方を採用す
るものであるが、かような簡易な処方であつても
既述の本発明の目的が効果的に達成される。すな
わち、注入ノズル３から湯溜り容器２内に落下す
る注湯流は、まず該多孔質耐火物製フイルター４
に衝突してその落下エネルギーが吸収され、この
多孔質耐火物製フイルター４を通過する時には、
動的な流れが静的な流れに変換されてから表面移
動鋳型１ａ，１ｂの方に下降して行くようにな
り、従つて、これが無い場合に比べて、湯の流動
現象は著しく軽減される。そして、この多孔質耐
火物製フイルター４の孔の分布を適切にすること
によつてここを通過する湯は適正に整流化され
る。すなわち、表面移動鋳型１ａ，１ｂの近傍で
は一様な押し出し流れに似た流れパターンのもと
で湯が連続的に到達し、これが連続的に凝固して
ゆくことになる。 Although the device of the present invention employs a very simple recipe of using such a porous refractory filter 4, even with such a simple recipe, the above-mentioned object of the present invention can be effectively achieved. will be achieved. That is, the poured metal flow falling from the injection nozzle 3 into the pool container 2 first passes through the porous refractory filter 4.
When it collides with and absorbs the falling energy, and passes through this porous refractory filter 4,
The dynamic flow is converted into a static flow and then descends toward the surface moving molds 1a and 1b, so the flow phenomenon of the hot metal is significantly reduced compared to the case without this. . By optimizing the distribution of the holes in this porous refractory filter 4, the hot water passing through it can be properly rectified. That is, in the vicinity of the surface-moving molds 1a and 1b, the hot water continuously arrives under a flow pattern similar to a uniform extrusion flow, and is continuously solidified.
この湯の流動吸収効果と整流効果によつて、温
度分布の乱れが防止されると共に局部的な不均一
凝固が防止されて凝固シエルの安定した成長がな
られるようになる。そして、湯の中に懸濁してい
た非金属介在物についても、これが表面移動鋳型
１ａ，１ｂの面まで巻き込まれて流れることが抑
制され、またフイルター４によつて濾過されるか
ら、これが凝固シエルに巻き込まれて鋳片品質を
悪くするようなことも自動的に防止される。 The flow absorption effect and rectification effect of the hot water prevent disturbances in temperature distribution and local uneven solidification, allowing stable growth of the solidified shell. Non-metallic inclusions suspended in the hot water are also prevented from being caught up and flowing to the surfaces of the surface-moving molds 1a and 1b, and are filtered by the filter 4, so that they become solidified shells. This automatically prevents the quality of the cast slab from being deteriorated by being caught in the flow.
第４図は、単純な平板状のものに代えて特殊な
形状とした多孔質耐火物製フイルター４の例を示
しており、この例では、フイルターを出てから表
面移動鋳型１ａ，１ｂに到達するまでの距離がど
こでもほぼ等しくなるように、このフイルター４
の下面の形状を、表面移動鋳型１ａ，１ｂの表面
形状と、ひいてはこの表面で形成される凝固シエ
ルの形状と、ほぼ相似形となるようにしたもので
ある。この場合には、単に平板状のものを使用す
るよりも一層整流化を図ることができる。そのさ
い、フイルター４の厚みが場所によつて異なるこ
とが不都合であれば、下面の形状に対応する形状
を上面にも形成してフイルター厚みを均一にする
こともできる。また、これに代えて、図示のよう
に、このフイルター４の中央部と両縁部では孔の
数や孔の径が異なる多孔質耐火物１０と１１とに
よる異種耐火物の合成体で構成し、このフイルタ
ー４から表面移動鋳型１ａ，１ｂへの湯の供給量
をコントロールするようにしてもよい。 Figure 4 shows an example of a porous refractory filter 4 that has a special shape instead of a simple flat plate, and in this example, it reaches the surface moving molds 1a and 1b after leaving the filter. This filter 4
The shape of the lower surface of the mold is substantially similar to the surface shape of the surface-moving molds 1a and 1b, and ultimately to the shape of the solidified shell formed by these surfaces. In this case, more rectification can be achieved than simply using a flat plate. At this time, if it is inconvenient that the thickness of the filter 4 varies depending on the location, the thickness of the filter can be made uniform by forming a shape corresponding to the shape of the lower surface on the upper surface. Alternatively, as shown in the figure, the center and both edges of the filter 4 are composed of a composite body of different types of refractories including porous refractories 10 and 11 having different numbers of holes and different diameters of the holes. The amount of hot water supplied from this filter 4 to the surface moving molds 1a, 1b may be controlled.
第５図は、ロールの代わりに、一対の回転同期
ベルトを表面移動鋳型１ａ，１ｂとした以外は、
第１図の例と実質上同じ本発明装置を示したもの
であり、この場合にも、多孔質耐火物製フイルタ
ー４を前述の関係をもつて湯溜り容器２内にセツ
トすることにより、湯の流動防止と整流化を図る
ことができる。 In FIG. 5, a pair of rotationally synchronous belts are used instead of the rolls, and the surface moving molds 1a and 1b are used.
This figure shows the apparatus of the present invention which is substantially the same as the example of FIG. The flow can be prevented and rectified.
以上のように、本発明装置は、双ロールまたは
双ベルトによる薄板連続鋳造装置における基本的
な課題である安定操業と鋳片品質の向上を、非常
に簡易な処方で湯の流れを制御することによつて
これを実現したものであり、装置構成を複雑化し
ないで既述の目的を効果的に達成したものであ
る。 As described above, the device of the present invention achieves stable operation and improvement of slab quality, which are the basic issues in continuous thin plate casting devices using twin rolls or twin belts, by controlling the flow of molten metal with a very simple recipe. This has been realized by the above-mentioned method, and the above-mentioned objective has been effectively achieved without complicating the device configuration.
第１図は本発明装置の１実施例を示す略断面
図、第２図は湯溜り容器の例を示す斜視図、第３
図は多孔質耐火物製フイルターの例を示す斜視
図、第４図は多孔質耐火物製フイルターの他の例
を示す斜視図、第５図は本発明装置の他の例を示
す略断面図である。
１……表面移動鋳型、２……湯溜り容器、３…
…注入ノズル、４……多孔質耐火物製フイルタ
ー、５……鋳片、８……タンデツシユ。
FIG. 1 is a schematic sectional view showing one embodiment of the device of the present invention, FIG. 2 is a perspective view showing an example of a water reservoir container, and FIG.
The figure is a perspective view showing an example of a porous refractory filter, FIG. 4 is a perspective view showing another example of a porous refractory filter, and FIG. 5 is a schematic sectional view showing another example of the device of the present invention. It is. 1... Surface moving mold, 2... Water reservoir, 3...
... Injection nozzle, 4 ... Porous refractory filter, 5 ... Slab, 8 ... Tundesh.
Claims (1)
向配置された一対の鋳造ロールまたは鋳造ベルト
によつて形成される表面移動鋳型１ａ，１ｂと、
この表面移動鋳型１ａ，１ｂの上に形成される湯
溜り容器２と、この湯溜り容器２内に溶湯を導く
注入ノズル３と、を備えた薄板連続鋳造装置にお
いて、前記の湯溜り容器２の内部に多孔質耐火物
からなるフイルター４を取付け、注入ノズル３か
ら湯溜り容器２内に導入された溶湯が該フイルタ
ー４を通過した後に凝固するようにした薄板連続
鋳造装置。1. Surface moving molds 1a and 1b formed by a pair of casting rolls or casting belts that are arranged facing each other at a predetermined interval corresponding to the thickness of the slab;
In a thin plate continuous casting apparatus equipped with a tundish container 2 formed on the surface moving molds 1a and 1b and an injection nozzle 3 for introducing the molten metal into the tundish container 2, the tundish container 2 is A thin plate continuous casting device in which a filter 4 made of porous refractory is installed inside, and the molten metal introduced from an injection nozzle 3 into a sump container 2 is solidified after passing through the filter 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3540984A JPS60180646A (en) | 1984-02-28 | 1984-02-28 | Continuous casting device for thin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3540984A JPS60180646A (en) | 1984-02-28 | 1984-02-28 | Continuous casting device for thin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60180646A JPS60180646A (en) | 1985-09-14 |
| JPH052417B2 true JPH052417B2 (en) | 1993-01-12 |
Family
ID=12441082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3540984A Granted JPS60180646A (en) | 1984-02-28 | 1984-02-28 | Continuous casting device for thin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60180646A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61289953A (en) * | 1985-06-14 | 1986-12-19 | Mitsubishi Heavy Ind Ltd | Continuous thin plate casting machine |
| US5178205A (en) * | 1990-07-13 | 1993-01-12 | Ishikawajima-Harima Heavy Industries Co. Limited | Strip casting method and apparatus |
| JPH0569090A (en) * | 1991-09-06 | 1993-03-23 | Mitsubishi Electric Corp | Horizontal continuous casting method and device |
| KR100584746B1 (en) * | 2001-12-21 | 2006-05-30 | 주식회사 포스코 | Segregation prevention device of twin roll sheet casting machine |
-
1984
- 1984-02-28 JP JP3540984A patent/JPS60180646A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60180646A (en) | 1985-09-14 |
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