JPH0451256B2 - - Google Patents
Info
- Publication number
- JPH0451256B2 JPH0451256B2 JP58009939A JP993983A JPH0451256B2 JP H0451256 B2 JPH0451256 B2 JP H0451256B2 JP 58009939 A JP58009939 A JP 58009939A JP 993983 A JP993983 A JP 993983A JP H0451256 B2 JPH0451256 B2 JP H0451256B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- twin rolls
- housing
- rolls
- tundish
- 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 44
- 229910052751 metal Inorganic materials 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 11
- 238000009749 continuous casting Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 19
- 238000001816 cooling Methods 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 102200082907 rs33918131 Human genes 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005204 segregation Methods 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
［産業上の利用分野］
この発明は急冷薄帯の連続鋳造装置に関するも
のである。
［従来の技術］
近年になつて例えば溶融金属（以下溶湯とい
う）を回転双ロール等の急冷装置に供給して急冷
して薄帯とし、偏析のない金属や平衡に関係のな
い合金相を有する金属、或いは微細結晶粒の金属
或いはまた非晶質金属を作る等の新しい金属の製
造についての研究が盛んに行なわれるようになつ
てきた。
これに用いられる装置として、一対のロール間
に溶湯を供給して急冷する双ロール式金型を使用
する装置が提案されている。
冷却用金型の移動面上に薄く溶湯を接触させる
ことによる急冷薄帯の連続鋳造装置において、薄
帯の厚さ方向のすべてにわたつて一定時間内に冷
却凝固させる上で最大のネツクになつている点は
冷却凝固させたい金属と金型との界面の熱伝達抵
抗であることは周知のとおりである。
この界面の熱伝達抵抗が小さく、換言すれば熱
伝達率αが大きければ一定以上の冷却速度で凝固
できる薄帯の厚さを増大できるが、従来この熱伝
達率αは金型によつて定まるいわゆる所与の条件
と考えられていたため、例えば非晶質の薄帯は数
十ミクロンの厚さが限度であつた。
その上、金型の表面に溶湯を単に接触させるだ
けでは、凝固収縮によるひずみによつて薄帯が片
面側に曲るいわゆるそり等が発生し、平坦性が悪
いという問題がある。
本発明は上記課題を解消すべく創案されたもの
であり、上記熱伝達率αの増大を図ることによ
り、一定以上の冷却速度で凝固させることができ
る薄帯の厚さの増大、薄帯の平坦性の改善、さら
には、生産速度の向上を達成し得る急冷薄帯の連
続鋳造装置を提供することを目的とする。
［課題を解決するための手段］
上記目的を達成するため本発明は、双ロール間
に溶融金属を供給して湯溜部を形成しつつ急冷薄
帯を製造する連続鋳造装置において、溶融金属供
給源からの溶融金属を双ロール間に案内すべくそ
の絞られた開口を双ロール間に臨ませて設けたタ
ンデツシユと、このタンデツシユにより供給され
た溶湯により上記双ロール間にロール頂部よりも
低い位置に湯面を位置させて形成される湯溜部
と、双ロール上に、そのロール軸に沿う側壁が上
記湯面の外側にガスシール手段を介して着座状に
設けられ、その内部に上記湯面を加圧するための
加圧室を区画形成するハウジングと、このハウジ
ング内に加圧ガスを供給するための加圧ガス供給
手段とを具備したものである。
［作 用］
ここで、本発明の原理について説明する。本発
明者は溶湯と冷却用移動金型との接触直後の熱伝
達率αの特性を明らかにするため溶綱中に銅ブロ
ツクを浸漬し、銅ブロツクに付着する凝固双の厚
さと浸漬時間の関係、銅ブロツクの温度上昇を調
べて解析した。その結果の一例を示せば次のとお
りである。浸漬時間１秒、溶綱温度1600℃、材質
JIS S10C、銅ブロツク寸法100mm丸×60mm厚の場
合、第１表の結果が得られた。
[Industrial Field of Application] This invention relates to a continuous casting apparatus for quenched ribbon. [Prior art] In recent years, for example, molten metal (hereinafter referred to as molten metal) is supplied to a quenching device such as rotating twin rolls and quenched to form a thin ribbon, which has metals without segregation or alloy phases unrelated to equilibrium. Research into the production of new metals, such as the production of metals or fine-grained metals or even amorphous metals, has become active. As an apparatus used for this, an apparatus using a twin-roll mold that supplies molten metal between a pair of rolls and rapidly cools it has been proposed. In continuous casting equipment for rapidly cooling ribbons, which involves thinly contacting the molten metal onto the moving surface of a cooling mold, this is the biggest hurdle in cooling and solidifying the entire thickness of the ribbon within a certain amount of time. It is well known that the important factor is the heat transfer resistance at the interface between the metal to be cooled and solidified and the mold. If the heat transfer resistance at this interface is small, in other words, if the heat transfer coefficient α is large, the thickness of the ribbon that can be solidified at a cooling rate above a certain level can be increased, but conventionally, this heat transfer coefficient α is determined by the mold. Since this was considered to be a so-called given condition, for example, the thickness of an amorphous ribbon was limited to several tens of microns. Furthermore, simply bringing the molten metal into contact with the surface of the mold causes the ribbon to curve to one side due to distortion due to solidification shrinkage, resulting in poor flatness. The present invention was devised to solve the above problems, and by increasing the heat transfer coefficient α, the thickness of the ribbon that can be solidified at a cooling rate above a certain level can be increased, and the thickness of the ribbon can be increased. It is an object of the present invention to provide a continuous casting apparatus for quenched ribbon that can improve flatness and further increase production speed. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a continuous casting apparatus that manufactures a quenched ribbon while supplying molten metal between twin rolls to form a sump. In order to guide molten metal from the source between the twin rolls, there is a tundish with its narrowed opening facing between the twin rolls, and the molten metal supplied by this tundish creates a gap between the twin rolls at a position lower than the top of the rolls. A molten water reservoir is formed by placing the molten water surface on the molten water surface, and a side wall along the roll axis is provided on the twin rolls so as to sit on the outside of the molten water surface via a gas sealing means, and the molten water is placed inside the sump portion. The device includes a housing defining a pressurizing chamber for pressurizing a surface, and pressurized gas supply means for supplying pressurized gas into the housing. [Function] Here, the principle of the present invention will be explained. In order to clarify the characteristics of the heat transfer coefficient α immediately after the contact between the molten metal and a moving mold for cooling, the present inventor immersed a copper block in the molten steel and determined the thickness of the solidified twin adhering to the copper block and the immersion time. The relationship and temperature rise of the copper block were investigated and analyzed. An example of the results is as follows. Immersion time 1 second, melt temperature 1600℃, material
In the case of JIS S10C and copper block dimensions of 100 mm round x 60 mm thick, the results shown in Table 1 were obtained.
【表】
第１表から、冷却凝固させたい金属と冷却用移
動金型間の接触圧力に相当する銅ブロツクの溶綱
中への浸漬深さの増大により、銅ブロツクの表面
に発達する凝固厚さと熱伝達率αが増大すること
が判明した。また凝固層の厚さｄと浸漬時間ｔと
の関係はｄ＝Ｋ・t-0.5（ただしＫは定数）で示さ
れ、この関係と銅ブロツクの温度変化から熱伝達
率αの時間変化は第２図に示すように双曲線的に
溶綱との接触直後に大きいことも明らかになつ
た。
これは加圧によつて溶湯と金型との間の濡れ性
が改善されること、および発達した凝固層が凝固
歪に起因して金型から不均一にそつて離れること
により真の接触面が小さくなることが防止される
ことによるものと考えられる。
これらのことから急冷薄帯の製造において溶湯
と冷却用移動金型とを加圧状態で接触させると熱
伝達率αの高い状態で凝固させることができ、非
晶質金属薄帯或いは急冷による結晶特性を向上さ
せた急冷薄帯等を一層厚さを厚く製造することが
できることになる。
例えば加圧室内の圧力を大気圧からおよそ0.2
Kg／cm2上げれば加圧しない場合の約２倍のαにな
り、その効果は顕著である。
［実施例］
次に添付図面に示す実施例について説明する。
第１図において、３は溶融金属供給源たる溶湯
供給装置であり、溶湯供給装置３を構成する金属
溶融炉３′の出湯口４の下方には双ロール１，１
が設けられている。溶融炉３′の出湯口４と双ロ
ール１，１との間には、溶融炉３′からの溶湯を
双ロール１，１間に案内するためのタンデツシユ
２が設けられている。タンデツシユ２は、出湯口
４に臨むその上部開口が大きく開口され、双ロー
ル１，１間に臨むその下部開口が小さく絞られて
いる。すなわち、タンデツシユ２は、溶融炉３′
の出湯口４から出た溶湯を一旦受けて、双ロール
１，１間への溶湯の供給流量を制限するものであ
り、上記双ロール１，１間には、このタンデツシ
ユ２を介して溶湯が供給されることにより、ロー
ル頂部よりも低い位置に湯面８を有して湯溜部９
が形成されるようになつている。溶湯供給装置３
は、溶融炉３′内に挿入されたロツド状のストツ
パ５を上下に移動させることにより出湯口４を開
閉できるようになつている。
双ロール１，１の溶湯入口側には、上記溶湯供
給装置３とタンデツシユ２とを収容するようにし
て、下部が開口されたハウジング６が設けられて
いる。このハウジング６のローラ軸に沿う両側壁
は双ロール１，１の頂部よりも外側に着座状に設
けられ、ローラ軸と直交する両側壁（図示せず）
はその下部がロール形状に合わせて形成されて双
ロール１，１端部近傍に着座状に設けられてい
る。また、双ローラ１，１間の両端には、溶湯の
漏れを防ぐために堰板（図示せず）が設けられて
いる。ハウジング６と双ロール１，１との摺動部
は、ガスの漏洩を防止するため通例のガスシール
手段、例えば針金を密生させたブラシをハウジン
グ６側に配置するとか、またはメカニカルシール
等の通例のガスシール手段によつてシールされて
いる。上記ストツパ５の駆動軸がハウジング６を
貫通している部分にも同様にガスシールが施され
ている。このハウジング６の側壁上部には、加圧
ガス供給手段たるガス供給管７が接続されてお
り、このガス供給管７を介してガス供給源（図示
せず）より加圧室６内に加圧ガスが供給されるよ
うになつている。かくしてハウジング６は、その
内部に、上記湯溜部９の湯面を加圧するための加
圧室を区画形成する。
急冷薄帯の製造の際には、所望の金属を溶湯供
給装置３の溶融炉３′中で溶融させ且つハウジン
グ６内にガス供給管７を通してガス体、好ましく
は非酸化性ガスまたは不活性ガスを送つてハウジ
ング内を昇圧させておいて、ストツパ５を上げて
ノズル４を開け、溶融炉３′中の溶湯をタンデツ
シユ２を介して双ロール１，１間に供給する。
このとき双ロール１，１間の湯面８はハウジン
グ６内の加圧ガスによつて圧力を受けるため溶湯
および凝固相１０はロール面に押しつけられ、金
属と双ロール１，１との接触界面の接触圧が高く
なる。これによつて熱伝達率αが増大すると共に
凝固歪による薄帯の不均一なそりの発生も防止さ
れる。
双ロール１，１とハウジング６とのシール部は
溶湯に直接触れる場所でないので、この部分のシ
ール手段としてはガスシールに通例用いられるメ
カニカルシールの如きシール法で十分対応でき、
ハウジング６の内圧さえ0.2Kg／cm2程度に保つこ
とができれば多少漏洩しても差支えない。
［発明の効果］
以上要するに本発明によれば、次の如き優れた
効果を発揮する。
(1) 双ロール間に形成した湯溜部の湯面を加圧す
ることにより、冷却凝固させたい金属とロール
面間の熱伝達率αを増大させることができるの
で、一定以上の冷却速度で凝固させることがで
きる薄帯の厚さの増大、薄帯の平坦性の改善、
さらには、生産速度の向上を図ることができ
る。
(2) 加圧室を形成するハウジングと双ロール間に
はさほど高いシール性は要求されないので、ガ
スシールに通例用いられる簡易なシール法で十
分対応できる。[Table] From Table 1, the solidification thickness that develops on the surface of the copper block increases as the immersion depth of the copper block into the molten steel increases, which corresponds to the contact pressure between the metal to be cooled and solidified and the moving mold for cooling. It was found that the heat transfer coefficient α increases with increasing temperature. In addition, the relationship between the thickness d of the solidified layer and the immersion time t is expressed as d = K・t -0.5 (where K is a constant), and from this relationship and the temperature change of the copper block, the time change of the heat transfer coefficient α is As shown in Figure 2, it was also revealed that the molten steel becomes hyperbolically large immediately after contact with the molten steel. This is because the wettability between the molten metal and the mold is improved by pressurization, and the solidified layer that has developed is unevenly moved away from the mold due to solidification strain, resulting in a true contact surface. This is thought to be due to the fact that it is prevented from becoming smaller. For these reasons, in the production of quenched metal ribbons, if the molten metal is brought into contact with the moving mold for cooling under pressure, it can be solidified in a state with a high heat transfer coefficient α. This makes it possible to produce thicker quenched ribbons with improved properties. For example, the pressure inside the pressurized chamber is approximately 0.2 from atmospheric pressure.
If Kg/cm 2 is increased, α will be approximately twice that of the case without pressurization, and the effect is remarkable. [Example] Next, an example shown in the attached drawings will be described. In FIG. 1, reference numeral 3 denotes a molten metal supply device as a molten metal supply source, and twin rolls 1, 1
is provided. A tundish 2 for guiding the molten metal from the melting furnace 3' between the twin rolls 1, 1 is provided between the tap port 4 of the melting furnace 3' and the twin rolls 1, 1. The tundish 2 has a large upper opening facing the tap 4, and a narrower lower opening facing between the twin rolls 1. That is, the tundish 2 is connected to the melting furnace 3'
Once the molten metal comes out from the outlet 4, the flow rate of the molten metal is restricted between the twin rolls 1 and 1. By being supplied, the molten water pool 9 is formed with the molten water level 8 at a lower position than the top of the roll.
is beginning to form. Molten metal supply device 3
The tap 4 can be opened and closed by moving up and down a rod-shaped stopper 5 inserted into the melting furnace 3'. A housing 6 with an open bottom is provided on the molten metal inlet side of the twin rolls 1, 1 to accommodate the molten metal supply device 3 and the tundish 2. Both side walls of the housing 6 along the roller axis are seated outside the tops of the twin rolls 1, 1, and both side walls (not shown) are perpendicular to the roller axis.
The lower part of the roller is formed to match the shape of the roll and is seated near the end of the twin rolls 1 and 1. Furthermore, weir plates (not shown) are provided at both ends between the twin rollers 1, 1 to prevent leakage of molten metal. The sliding parts between the housing 6 and the twin rolls 1, 1 are provided with a conventional gas sealing means to prevent gas leakage, such as by placing a brush with dense wire on the housing 6 side, or by using a mechanical seal, etc. sealed by a gas sealing means. A gas seal is similarly applied to the portion where the drive shaft of the stopper 5 passes through the housing 6. A gas supply pipe 7 serving as pressurized gas supply means is connected to the upper side wall of the housing 6, and pressurization is applied into the pressurizing chamber 6 from a gas supply source (not shown) through the gas supply pipe 7. Gas is now being supplied. Thus, the housing 6 defines therein a pressurizing chamber for pressurizing the hot water surface of the hot water reservoir 9. During production of the quenched ribbon, the desired metal is melted in the melting furnace 3' of the molten metal supply device 3 and a gaseous body, preferably a non-oxidizing gas or an inert gas, is passed through the gas supply pipe 7 into the housing 6. The pressure in the housing is increased by raising the pressure in the housing, the stopper 5 is raised to open the nozzle 4, and the molten metal in the melting furnace 3' is supplied between the twin rolls 1 through the tundish 2. At this time, the molten metal surface 8 between the twin rolls 1, 1 is subjected to pressure by the pressurized gas in the housing 6, so the molten metal and solidified phase 10 are pressed against the roll surface, and the contact interface between the metal and the twin rolls 1, 1. contact pressure increases. This increases the heat transfer coefficient α and also prevents uneven warping of the ribbon due to solidification strain. Since the sealing part between the twin rolls 1, 1 and the housing 6 is not a place that comes into direct contact with the molten metal, a sealing method such as a mechanical seal commonly used for gas sealing can be used as a sealing method for this part.
As long as the internal pressure of the housing 6 can be maintained at about 0.2 kg/cm 2 , there is no problem even if there is some leakage. [Effects of the Invention] In summary, according to the present invention, the following excellent effects are achieved. (1) By pressurizing the surface of the molten metal in the sump formed between the twin rolls, it is possible to increase the heat transfer coefficient α between the metal to be cooled and solidified and the roll surface, so solidification occurs at a cooling rate above a certain level. The thickness of the ribbon can be increased, the flatness of the ribbon can be improved,
Furthermore, production speed can be improved. (2) Since very high sealing performance is not required between the housing forming the pressurized chamber and the twin rolls, a simple sealing method commonly used for gas sealing can be used.
第１図は本発明の装置の実施例を図解的に示し
た縦断面図、第２図は接触時間と熱伝達率との関
係の一例を示すグラフである。
１…双ロール、２…タンデツシユ、３…溶融金
属供給装置、３′…金属溶融炉、４…ノズル（出
湯口）、５…ストツパ、６…ハウジング、７…加
圧ガス供給手段たるガス供給管、８…湯面、９…
湯溜部、１０…凝固相。
FIG. 1 is a longitudinal sectional view schematically showing an embodiment of the apparatus of the present invention, and FIG. 2 is a graph showing an example of the relationship between contact time and heat transfer coefficient. DESCRIPTION OF SYMBOLS 1...Twin rolls, 2...Tundish, 3...Molten metal supply device, 3'...Metal melting furnace, 4...Nozzle (tapping port), 5...Stopper, 6...Housing, 7...Gas supply pipe serving as pressurized gas supply means , 8... hot water surface, 9...
Water reservoir section, 10... solidification phase.
Claims (1)
成しつつ急冷薄帯を製造する連続鋳造装置におい
て、溶融金属供給源からの溶融金属を双ロール間
に案内すべくその絞られた開口を双ロール間に臨
ませて設けたタンデツシユと、このタンデツシユ
により供給された溶湯により上記双ロール間にロ
ール頂部よりも低い位置に湯面を位置させて形成
される湯溜部と、双ロール上に、そのロール軸に
沿う側壁が上記湯面の外側にガスシール手段を介
して着座状に設けられ、その内部に上記湯面を加
圧するための加圧室を区画形成するハウジング
と、このハウジング内に加圧ガスを供給するため
の加圧ガス供給手段とを具備したことを特徴とす
る急冷薄帯の連続鋳造装置。1. In a continuous casting device that manufactures quenched ribbon by supplying molten metal between twin rolls to form a sump, a constricted opening is used to guide molten metal from a molten metal supply source between the twin rolls. a tundish which faces between the twin rolls; a tundish formed by the molten metal supplied by the tundish with the molten metal surface positioned between the twin rolls at a position lower than the top of the rolls; a housing whose side wall along the roll axis is seated on the outside of the hot water surface through a gas sealing means and defines a pressurizing chamber for pressurizing the hot water surface inside the housing; 1. A continuous casting apparatus for rapidly quenched ribbon, comprising a pressurized gas supply means for supplying pressurized gas into the apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP993983A JPS59137162A (en) | 1983-01-26 | 1983-01-26 | Device for producing quenched strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP993983A JPS59137162A (en) | 1983-01-26 | 1983-01-26 | Device for producing quenched strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59137162A JPS59137162A (en) | 1984-08-07 |
| JPH0451256B2 true JPH0451256B2 (en) | 1992-08-18 |
Family
ID=11733980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP993983A Granted JPS59137162A (en) | 1983-01-26 | 1983-01-26 | Device for producing quenched strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59137162A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60199551A (en) * | 1984-03-23 | 1985-10-09 | Nippon Steel Corp | Method and device for producing thin metallic strip |
| JP2591098B2 (en) * | 1988-07-26 | 1997-03-19 | 石川島播磨重工業株式会社 | Twin roll continuous casting machine |
| KR101190772B1 (en) | 2011-04-15 | 2012-10-12 | 한국기계연구원 | A continuous casting method of bulk amorphous alloy strip and low melting temperature bulk amorphous alloy strip produced thereby |
| CN109967703B (en) * | 2019-04-08 | 2020-09-18 | 东北大学 | Method for continuously and efficiently preparing wide amorphous thin strip with thickness of 80-1500 mu m at high cooling speed |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5336249A (en) * | 1976-09-16 | 1978-04-04 | Fuji Xerox Co Ltd | Metod of making mirror replica |
| JPS5496432A (en) * | 1978-01-18 | 1979-07-30 | Noboru Tsuya | Method and apparatus for making thin member |
| JPS58224048A (en) * | 1982-06-22 | 1983-12-26 | Hitachi Zosen Corp | Preventing method of slip in formation of solidified shell with twin molding rolls |
-
1983
- 1983-01-26 JP JP993983A patent/JPS59137162A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5336249A (en) * | 1976-09-16 | 1978-04-04 | Fuji Xerox Co Ltd | Metod of making mirror replica |
| JPS5496432A (en) * | 1978-01-18 | 1979-07-30 | Noboru Tsuya | Method and apparatus for making thin member |
| JPS58224048A (en) * | 1982-06-22 | 1983-12-26 | Hitachi Zosen Corp | Preventing method of slip in formation of solidified shell with twin molding rolls |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59137162A (en) | 1984-08-07 |
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