JPH0141429B2 - - Google Patents
Info
- Publication number
- JPH0141429B2 JPH0141429B2 JP55177775A JP17777580A JPH0141429B2 JP H0141429 B2 JPH0141429 B2 JP H0141429B2 JP 55177775 A JP55177775 A JP 55177775A JP 17777580 A JP17777580 A JP 17777580A JP H0141429 B2 JPH0141429 B2 JP H0141429B2
- Authority
- JP
- Japan
- Prior art keywords
- ingot
- atmosphere
- heating element
- feeder
- molten metal
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 14
- 239000011261 inert gas Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 238000005054 agglomeration Methods 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 239000003832 thermite Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Description
本発明は主に不活性ガス雰囲気中において鋳塊
を凝固させるのに好適する押湯保温方法に関す
る。
鋳塊の鋳造にあたつては溶鋼の冷却凝固収縮に
伴つて生成する引けを軽減し、歩留りをよくする
上から押湯保温が行なわれる。周知の押湯保温技
術のうち、外部からの積極的発熱を利用するもの
に発熱性保温剤中の金属アルミニウムのテルミツ
ト反応を利用するのがある。
これは大気雰囲気中において、金属アルミニウ
ムが当初は保温剤中のFeO，Fe2O3等の酸化剤に
より燃焼し、その後は大気中の酸素に助けられて
燃焼が継続して保温効果をもたらすものである。
このテルミツト反応を利用する押湯保温を不活
性ガス雰囲気中で実施した場合、当初金属アルミ
ニユームが保温剤中の酸化剤と反応して燃焼する
間は保温効果が発揮されるが、その後は酸素の供
給がないことに起因して燃焼が中断し、早い時期
に鋳型内押湯部溶湯への保温効果がなくなり、そ
の結果鋳塊頭部には大きな引けを生成し、歩留り
を低下させるとともに鋳塊軸心部にキヤビテイー
が多発して品質を悪化させる。そこで、Ti，Al
などの活性金属元素を含有する高合金の鋳塊を鋳
造するにあたつては真空雰囲気中で溶湯を溶製
し、鋳型内押湯部溶湯を十分に保温するために通
常大気雰囲気中で注入するか、もしくは不活性ガ
ス雰囲気中で注入し、終了後直ちに雰囲気を大気
にもどす手法が採用されている。しかし、このよ
うな手法では大気にさらされることにより、Ti，
Alなどの活性金属元素が反応して成分濃度が注
入前に比べて鋳塊において著るしく減少し、明確
な含有成分量がコントロールできなくなる。
また、雰囲気を大気にもどす際には取鍋内付着
溶湯の酸化に起因して次回の注入時に介在物が著
るしく増加するなどの悪影響もある。このような
欠点を防止するには鋳塊の凝固が完了するまで、
大気にさらすことなく不活性ガス雰囲気に保持し
つつ鋳型内押湯溶湯を十分に保温する必要があ
り、前記したようなテルミツト反応を利用する押
湯保温剤以外の手法を用い、しかも予定する十分
な保温効果が得られる積極的な加熱手段を講じな
ければならない。
ところで、真空、もしくは不活性ガス雰囲気中
において鋳型内押湯部溶湯を高温に保持するに
は、誘導加熱、電子ビーム、レザー、プラズマト
ーチ、アーク、赤外線などのいくつかの手法があ
り、さらにエレクトロスラグの電気抵抗熱による
加熱も提案されているが、これらは大規模な装置
となるため、容積に制約のある真空溶解炉造塊槽
内には適用しがたい。
次に、モリブデン、タンタル、タングステンな
どの金属材料からなる電気抵抗発熱体による加熱
が考えられるが、前記金属発熱体は1500℃程度の
高温で使用されるため、しかも大気、H2もしく
はAr−H2の還元性雰囲気、あるいは10-3mmHg以
上の減圧雰囲気等にさらされるため、この様な過
酷な使用条件に耐え得ず寿命が短かいなどの難点
があり、工業的には適用が困難である。
他方、シリコネツト、ケラマツクスなどの非金
属材料もやはり1500℃程度の高温では寿命が短か
く、安定化ジルコニアでは導電性を示す1000〜
1200℃まで、例えば、シリコニツトの補助加熱装
置を用いて昇温しなければならず、完全に密閉し
た真空溶解炉造塊槽にはスペース的にも適用困難
である。
本発明は上述の点に鑑みなされたものであつ
て、黒鉛の発熱体が昇温途中の大気、真空、不活
性ガスといつた雰囲気の激変にも容易に耐え、ま
た、1500℃程度の高温での使用でも寿命が長く、
そして鋳型内押湯部溶湯を保持するのに十分なだ
けの発熱量を容易に供給しうる利点をもつている
点に着目し、これを完全密閉した造塊槽内におい
て発熱体に使用して鋳型内押湯溶湯を保温するの
に好適する方法を提供しようとするものである。
以下、本発明の実施例を図示を参照しながら詳
細に説明する。
図において、１は鋳型、２は押湯枠で、この押
湯枠２は断熱レンガ製の筒壁２ａ内面に内張材２
ｂが張設され筒壁２ａ外面には鉢金２ｃを纒着し
てなり、鋳型１および押湯枠２の組合せ構成は周
知のものである。３は本発明の方法を実施する装
置を示し、押湯枠２上に載る断熱レンガ製の環状
基台４と、該基台４に装着される黒鉛製の有底容
器状の発熱体５と、この発熱体５に結合した電極
６とよりなり、発熱体５の下半部が基台４内に嵌
着されて押湯枠２開口部を覆い、また、発熱体５
内中空部にはセラミツクウールなどの保温材７が
充填される。
なお、図中８は基台４に装着した熱電対で、発
熱体５の温度制御を行なうためのものであり、ま
た９は基台４に装着した湯面検出センサーで、注
入時の溶湯上限を検出する。
次に、本発明の方法を真空雰囲気中で溶解し、
不活性ガス（アルゴン）雰囲気中で注入を行い、
引きつづき同じ雰囲気中で凝固させるTi，Alを
含有する高合金鋳塊を完全密閉された造塊槽内で
鋳造する場合について説明する。
本発明の実施対称は、Ti＋Al含有量が0.5％以
上の高合金の鋳塊の鋳造にある。
The present invention mainly relates to a riser heat retention method suitable for solidifying an ingot in an inert gas atmosphere. When casting an ingot, the riser is kept warm in order to reduce the shrinkage that occurs as the molten steel cools and solidifies and shrinks, and to improve the yield. Among the well-known heat retention techniques for a riser, one that utilizes active heat generation from the outside is one that utilizes thermite reaction of metal aluminum in an exothermic heat insulator. This is a process in which metal aluminum is initially burned in the atmosphere by oxidizing agents such as FeO and Fe 2 O 3 in the heat insulating agent, and then the combustion continues with the help of oxygen in the atmosphere, resulting in a heat insulating effect. It is. When heat insulation of a riser using this thermite reaction is performed in an inert gas atmosphere, the heat retention effect is initially exhibited while the metal aluminum reacts with the oxidizing agent in the insulation agent and burns, but after that, the Combustion is interrupted due to lack of supply, and the heat retention effect on the molten metal in the riser part of the mold is lost at an early stage.As a result, a large shrinkage occurs at the head of the ingot, reducing the yield and causing the ingot to melt. Cavities occur frequently in the shaft center, deteriorating quality. Therefore, Ti, Al
When casting high-alloy ingots containing active metal elements such as molten metal, the molten metal is melted in a vacuum atmosphere, and in order to keep the molten metal sufficiently warm in the feeder section of the mold, it is usually poured in an atmospheric atmosphere. Alternatively, a method is adopted in which the injection is carried out in an inert gas atmosphere and the atmosphere is immediately returned to the atmosphere after completion of the injection. However, with this method, Ti,
Active metal elements such as Al react, and the component concentration in the ingot significantly decreases compared to before injection, making it impossible to clearly control the content of the components. Furthermore, when the atmosphere is returned to the atmosphere, there is an adverse effect such as a significant increase in inclusions during the next injection due to oxidation of the molten metal adhering to the ladle. To prevent such defects, wait until the solidification of the ingot is completed.
It is necessary to keep the molten feeder in the mold sufficiently warm while keeping it in an inert gas atmosphere without exposing it to the atmosphere. Proactive heating methods must be used to achieve a heat-retaining effect. By the way, there are several methods to maintain the molten metal in the mold riser at a high temperature in a vacuum or in an inert gas atmosphere, such as induction heating, electron beam, laser, plasma torch, arc, and infrared rays. Heating of slag using electrical resistance heat has also been proposed, but these require large-scale equipment and are difficult to apply in a vacuum melting furnace agglomeration tank with limited capacity. Next, heating using an electrical resistance heating element made of a metal material such as molybdenum, tantalum, or tungsten can be considered, but since the metal heating element is used at a high temperature of about 1500°C, it is also possible to heat it with an electric resistance heating element made of a metal material such as molybdenum, tantalum, or tungsten. Since it is exposed to a reducing atmosphere of 2 or a reduced pressure atmosphere of 10 -3 mmHg or more, it cannot withstand such harsh usage conditions and has a short lifespan, making it difficult to apply industrially. be. On the other hand, non-metallic materials such as silicone net and Keramax also have short lifespans at high temperatures of around 1500°C, and stabilized zirconia exhibits conductivity at temperatures of 1000°C to 1000°C.
The temperature must be raised to 1200°C using, for example, a siliconite auxiliary heating device, which is difficult to apply in a completely sealed vacuum melting furnace or agglomeration tank due to space considerations. The present invention was developed in view of the above points, and the graphite heating element easily withstands drastic changes in the atmosphere during heating, such as air, vacuum, and inert gas, and also has a high temperature of about 1500°C. It has a long life even when used in
We focused on the fact that it has the advantage of easily supplying enough heat to hold the molten metal in the riser section of the mold, and used it as a heating element in a completely sealed agglomeration tank. It is an object of the present invention to provide a method suitable for keeping the temperature of the molten metal in the mold feeder. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, 1 is a mold, 2 is a feeder frame, and this feeder frame 2 has a lining material on the inner surface of a cylinder wall 2a made of insulating bricks.
b is stretched, and a bowl metal 2c is attached to the outer surface of the cylindrical wall 2a, and the combination structure of the mold 1 and the feeder frame 2 is well known. 3 shows an apparatus for implementing the method of the present invention, which includes an annular base 4 made of insulating bricks placed on the feeder frame 2, a heating element 5 in the form of a bottomed container made of graphite attached to the base 4; , and an electrode 6 coupled to the heating element 5. The lower half of the heating element 5 is fitted into the base 4 to cover the opening of the riser frame 2, and the heating element 5
The inner hollow part is filled with a heat insulating material 7 such as ceramic wool. In the figure, 8 is a thermocouple attached to the base 4, which is used to control the temperature of the heating element 5, and 9 is a molten metal level detection sensor attached to the base 4, which measures the upper limit of molten metal during pouring. Detect. Next, the method of the present invention is dissolved in a vacuum atmosphere,
Injection is performed in an inert gas (argon) atmosphere,
Next, we will explain the case where a high alloy ingot containing Ti and Al that is solidified in the same atmosphere is cast in a completely sealed agglomeration tank. The object of the present invention is the casting of high-alloy ingots with a Ti+Al content of 0.5% or more.
【表】
〓0.08 0.40／1.00 1.00／2.00 〓0.040
〓0.030 24.0／27.0 13.50／16.00
(〓0.020)
(〓0.005)
[Table] 〓0.08 0.40／1.00 1.00／2.00 〓0.040
〓0.030 24.0/27.0 13.50/16.00
(〓0.020)
(〓0.005)
【表】【table】
【表】
注入後の鋳塊の凝固はつぎのような状況のもと
で進行するものと仮定する。
(i) 第１段階
押湯保温材は、注入終了後15mm間燃焼する。こ
の時期には溶湯は過熱状態に保持され、鋳塊軸心
部で等軸晶帯は生成されない。
(ii) 第２段階
押湯保温剤の燃焼が終了すると、直ちに溶湯の
過熱が消滅し、鋳塊軸心部で等軸晶帯の生成が始
まる。注入終了後60mmで鋳塊本体の凝固が完了す
る。この時期の後半に、鋳塊上部、軸心部でキヤ
ビテイーの発現する危険性がある。
(iii) 第３段階
その後、押湯部の凝固がはじまり、注入終了後
75mmで鋳塊全体の凝固が完了する。この時期には
鋳塊頭部に大きな引け巣の生じる危険性がある。
供給電力の大きさは、基本的には大気雰囲気中
で使用する通常の押湯保温剤の熱的特性を基準に
し、次のような範囲の値を設定して実施した。
(i) 第１段階：12.5KVA〜50KVA
(ii) 第２段階：6KVA〜25KVA
(iii) 第３段階：第２段階の値から、零にまで下げ
ていく。
供給電力の設定値によつて、鋳塊内部性状に次
のような傾向が見出された。なお、第１段階およ
び第２段階の途中における供給電力は一定の値に
保つた。
第１段階で供給電力を大きくすると、鋳塊本
体、軸心部でキヤビテイーの発現頻度が大きくな
り、反対に小さくすると鋳塊本体内の成分偏折が
著るしくなる。
第２段階で供給電力を大きくすると、鋳塊本体
内の成分偏折が著るしくなり、反対に小さくする
と鋳塊本体、軸心部でキヤビテイーの発現頻度が
大きくなる。
第３段階で供給電力を零に落とす時期が早い
と、押湯部内部の凝固収縮孔が大きくなり、その
時期が遅いと鋳塊上表面が大きく凹むようにな
る。
いうまでもなく、鋳塊で発現を防止せねばなら
ない主要な欠陥は材料により異なるので、したが
つて、各々の材料に応じて各段階の供給電力の大
きさを適当に設定する必要がある。
斯くして不活性ガス雰囲気中において押湯の保
温が予定通りに、しかも、発熱量をコントロール
して合理的に行なうことができて鋳塊上表面の引
け巣の生成も最小に止めることができる。
以上説明したように本発明の方法によれば、黒
鉛の発熱体に対する通電発熱により鋳型内押湯部
溶湯を保温するから、大気、真空、不活性ガスと
いつた雰囲気の激変にも容易に耐え、長寿命にし
て充分な保温効果が得られ、しかも装置はコンパ
クトにしてスペース的に制限のある真空溶解炉造
塊槽内にて実施するのに都合がよく、また、鋳塊
はその含有成分量が自由にコントロールできて品
質が保証され、歩留りも一段と向上し得る効果を
奏する。[Table] It is assumed that the solidification of the ingot after pouring proceeds under the following conditions. (i) First stage The feeder heat insulation material burns for 15mm after the injection is completed. During this period, the molten metal is kept in a superheated state, and equiaxed crystal bands are not generated at the center of the ingot axis. (ii) Second stage As soon as the combustion of the feeder heat insulating agent is completed, the superheat of the molten metal disappears, and the formation of equiaxed crystal zones begins at the center of the ingot axis. Solidification of the ingot body is completed 60mm after the end of injection. In the latter half of this period, there is a risk that cavities will develop in the upper part of the ingot and in the shaft center. (iii) 3rd stage After that, solidification of the feeder starts and after the injection is completed.
Solidification of the entire ingot is completed at 75mm. During this period, there is a risk of large shrinkage cavities forming in the ingot head. The magnitude of the supplied power was basically based on the thermal characteristics of a normal feeder heat insulating agent used in the atmosphere, and the value was set within the following range. (i) 1st stage: 12.5KVA to 50KVA (ii) 2nd stage: 6KVA to 25KVA (iii) 3rd stage: Lower the value from the 2nd stage to zero. The following trends were found in the internal properties of the ingot depending on the set value of the supplied power. Note that the power supply during the first stage and the second stage was kept at a constant value. If the power supply is increased in the first stage, the frequency of cavities occurring in the ingot body and the shaft center will increase, and if it is decreased, conversely, component polarization within the ingot body will become significant. If the supplied power is increased in the second stage, component polarization within the ingot body will become significant, while if it is decreased, the frequency of cavities occurring in the ingot body and axial center portion will increase. If the power supply is reduced to zero early in the third stage, the solidification shrinkage pores inside the feeder become large, and if the time is delayed, the upper surface of the ingot will be greatly depressed. Needless to say, the major defects that must be prevented from occurring in the ingot vary depending on the material, and therefore it is necessary to appropriately set the magnitude of the power supply at each stage depending on each material. In this way, the heat retention of the riser in an inert gas atmosphere can be carried out as planned and rationally by controlling the calorific value, and the formation of shrinkage cavities on the upper surface of the ingot can be minimized. . As explained above, according to the method of the present invention, the temperature of the molten metal in the riser part of the mold is maintained by the heat generated by energizing the graphite heating element, so it can easily withstand drastic changes in the atmosphere such as air, vacuum, and inert gas. , it has a long life and sufficient heat retention effect, and the equipment is compact and can be conveniently carried out in a vacuum melting furnace agglomeration tank where space is limited. The amount can be controlled freely, quality is guaranteed, and yield can be further improved.
図面はこの方法を実施する装置の要部縦断面図
である。
１……鋳型、２……押湯枠、３……装置、４…
…基台、５……発熱体、６……電極、７……保温
材、８……熱電対、９……湯面検出センサー。
The drawing is a longitudinal sectional view of a main part of an apparatus for carrying out this method. 1...Mold, 2...Riser frame, 3...Device, 4...
... base, 5 ... heating element, 6 ... electrode, 7 ... heat insulating material, 8 ... thermocouple, 9 ... hot water level detection sensor.
Claims (1)
配装し、該発熱体に対する通電加熱により鋳型内
押湯部溶湯を保温しつつ、不活性ガスまたは真空
雰囲気下で、鋳塊を鋳造する方法であつて、鋳造
時、溶湯の過熱段階、鋳塊本体の凝固段階、押湯
部の凝固段階の各段階において、黒鉛発熱体の通
電加熱量を制御することを特徴とする押湯保温に
よる鋳造方法。1. A graphite heating element is arranged on the feeder frame so as to cover it, and the ingot is heated in an inert gas or vacuum atmosphere while keeping the molten metal in the riser part of the mold warm by heating the heating element with electricity. A method for casting a feeder, characterized in that the amount of electrical heating of a graphite heating element is controlled at each stage of casting: superheating the molten metal, solidifying the ingot body, and solidifying the feeder part. Casting method using heat retention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17777580A JPS57100863A (en) | 1980-12-15 | 1980-12-15 | Method for heat insulation of riser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17777580A JPS57100863A (en) | 1980-12-15 | 1980-12-15 | Method for heat insulation of riser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57100863A JPS57100863A (en) | 1982-06-23 |
| JPH0141429B2 true JPH0141429B2 (en) | 1989-09-05 |
Family
ID=16036892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17777580A Granted JPS57100863A (en) | 1980-12-15 | 1980-12-15 | Method for heat insulation of riser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57100863A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6023983A (en) * | 1983-07-16 | 1985-02-06 | 昭和電炉興業株式会社 | Heater |
| KR20030087109A (en) * | 2002-05-06 | 2003-11-13 | 현대자동차주식회사 | System for heating riser and gravity casting method using the same |
| CN101979181B (en) * | 2010-10-21 | 2013-04-10 | 施小建 | Large-scale propeller riser resistance heating device |
| JP2013049082A (en) * | 2011-08-31 | 2013-03-14 | Honda Motor Co Ltd | Apparatus and method for casting |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245529A (en) * | 1975-10-08 | 1977-04-11 | Fuoseko Japan Rimitetsudo Yuug | Plates for keeping warm of riser top surface |
| JPS5437032A (en) * | 1977-08-30 | 1979-03-19 | Nippon Kokan Kk | Method of controlling steel ingot |
| JPS5564958A (en) * | 1978-11-06 | 1980-05-16 | Sumitomo Metal Ind Ltd | Feeder heat retaining method by induction heating |
-
1980
- 1980-12-15 JP JP17777580A patent/JPS57100863A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245529A (en) * | 1975-10-08 | 1977-04-11 | Fuoseko Japan Rimitetsudo Yuug | Plates for keeping warm of riser top surface |
| JPS5437032A (en) * | 1977-08-30 | 1979-03-19 | Nippon Kokan Kk | Method of controlling steel ingot |
| JPS5564958A (en) * | 1978-11-06 | 1980-05-16 | Sumitomo Metal Ind Ltd | Feeder heat retaining method by induction heating |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57100863A (en) | 1982-06-23 |
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