JP3147185B2 - Induction furnace for melting cast iron - Google Patents
Induction furnace for melting cast ironInfo
- Publication number
- JP3147185B2 JP3147185B2 JP28359791A JP28359791A JP3147185B2 JP 3147185 B2 JP3147185 B2 JP 3147185B2 JP 28359791 A JP28359791 A JP 28359791A JP 28359791 A JP28359791 A JP 28359791A JP 3147185 B2 JP3147185 B2 JP 3147185B2
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- furnace
- induction furnace
- cast iron
- 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 - Lifetime
Links
Landscapes
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は誘導炉に関し、特に鋳
鉄溶解用るつぼ形誘導炉の炉体の形状に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction furnace, and more particularly to the shape of a furnace of a crucible induction furnace for melting cast iron.
【０００２】[0002]
【従来の技術】図２は通常のるつぼ形誘導炉の炉体形状
を示す概略断面図である。従来、このような誘導炉の炉
体形状を定める際には、一般に炉底から湯面までの高さ
（Ｈ）と湯室内径（Ｄ）との寸法比は、Ｈ／Ｄ＝ 1.4〜
1.5 に選び、電気特性及び耐火物の安定性を合理的にす
るとしていた。その場合、容量が５ｔ，６ｔ，８ｔ，１
０ｔ…の炉の湯室内径（Ｄ）はそれぞれ約９００ｍｍ，
９３０ｍｍ，１０００ｍｍ，１１００ｍｍ…で、湯面高
さ（Ｈ）はいずれも１２００ｍｍを超える値となってい
る。2. Description of the Related Art FIG. 2 is a schematic sectional view showing the shape of a furnace of a conventional crucible induction furnace. Conventionally, when determining the shape of the furnace body of such an induction furnace, the dimensional ratio between the height (H) from the furnace bottom to the surface of the molten metal and the diameter (D) of the chamber is generally H / D = 1.4 to
It chose 1.5 to rationalize electrical properties and refractory stability. In that case, the capacity is 5t , 6t, 8t, 1
The diameter (D) of the hot water chamber of the furnace at 0t ... is about 900 mm , respectively .
930 mm, 1000 mm, 1100 mm, etc., and the molten metal level (H) is a value exceeding 1200 mm.
【０００３】[0003]
【発明が解決しようとする課題】ところで、誘導炉で鋳
鉄の溶解を行うにあたり、その溶解材料として自動車の
ボディに用いる亜鉛（Ｚｎ）めっき鋼板の打抜きくずを
用いるケースが多くなってきているが、その場合にめっ
きされたＺｎが溶け出して、次に述べるような問題が発
生している。 (1) Ｚｎの融点は約４２０℃、また蒸発温度は約９２０
℃で、鋳鉄の溶解温度の１５００℃に比べてはるかに低
い。一方、誘導炉の炉体を形成している耐火物１には約
２０％の気孔がある。そこで、高温になり粘性の極端に
低くなったＺｎの液体や蒸発したＺｎの気体がこの耐火
物の気孔を容易に通過して水冷した誘導加熱コイル２の
近傍に達するか、これに接触することが起こり得る。そ
のようなときには、耐火物を通過するＺｎがコイル保護
用に設けられている湯漏れ検出センサに接触するので、
湯漏れを生じたとして検出器が作動する。その結果、Ｚ
ｎを含まない材料を溶解するときに比べてはるかに短い
期間で耐火物を寿命に達したと判断してしまうことにな
る。 (2) Ｚｎは酸素と結合し易く、大気に触れると容易にＺ
ｎＯとなるが、このＺｎＯは１４５０℃以上になると耐
火物を形成しているＳｉＯ2 と反応する。その結果、耐
火物を溶損させることになり、これも耐火物の短寿命化
につながる。そこで、この発明は上記現象を防止し、Ｚ
ｎを含む材料を問題なく溶解することのできる誘導炉を
提供することを目的とするものである。By the way, when melting cast iron in an induction furnace, there are increasing cases where zinc (Zn) -plated steel sheet scraps used for automobile bodies are used as the melting material. In that case, the plated Zn melts out, and the following problem occurs. (1) Zn has a melting point of about 420 ° C. and an evaporation temperature of about 920
° C, which is much lower than the melting temperature of cast iron, 1500 ° C. On the other hand, the refractory 1 forming the furnace body of the induction furnace has about 20% of pores. Therefore, the Zn liquid or the evaporated Zn gas which has become extremely hot and has extremely low viscosity easily passes through the pores of the refractory and reaches or comes into contact with the water-cooled induction heating coil 2. Can occur. In such a case, Zn passing through the refractory comes into contact with the hot water leak detection sensor provided for coil protection.
The detector operates assuming that hot water has leaked. As a result, Z
This means that the refractory has reached the end of its life in a much shorter time than when the material containing no n is melted. (2) Zn is easily bonded to oxygen and easily exposed to the atmosphere.
Although it becomes nO, this ZnO reacts with SiO 2 forming a refractory at 1450 ° C. or higher. As a result, the refractory is melted, which also leads to a shortened life of the refractory. Therefore, the present invention prevents the above phenomenon, and
It is an object of the present invention to provide an induction furnace capable of melting a material containing n without any problem.
【０００４】[0004]
【課題を解決するための手段】発明者らはＺｎの気体が
耐火物の気孔に侵入する度合いとその圧力との関係につ
いて着目し、使用済みの多くの炉について分析を繰り返
したところ、湯面高さが１２００ｍｍを超えるとＺｎの
耐火物に対する侵入の度合いが急激に増える一方、湯面
高さがそれ以下ならＺｎの侵入は実用上問題にならない
程度であることを見出した。この発明は、このような知
見に基づくものであって、耐火物としてＳｉＯ2 のスタ
ンプ材を用いた容量が５ｔ以上の鋳鉄溶解用誘導炉であ
っても、湯面の炉底からの許容高さを1200ｍｍ以下に構
成することにより上記目的を達成しようとするものであ
る。Means for Solving the Problems The present inventors have paid attention to the relationship between the degree of penetration of the Zn gas into the pores of the refractory and the pressure, and have repeatedly analyzed many used furnaces. It has been found that when the height exceeds 1200 mm, the degree of penetration of Zn into the refractory increases sharply, while when the level of the molten metal is lower than that, the penetration of Zn is not practically problematic. The present invention is based on such a finding, and is applicable to an induction furnace for melting cast iron using a stamp material of SiO 2 as a refractory and having a capacity of 5 t or more. The object is achieved by configuring the height to be 1200 mm or less.
【０００５】[0005]
【作用】通常、炉内溶湯中のＺｎはすでに気体になって
おり、これが耐火物に接触すると、その気体の圧力に応
じて耐火物の気孔に侵入する。すなわち、気体の圧力が
高いほど気孔への侵入の度合いが大きい。しかし、気体
の圧力及び耐火物の特性によっては通過する気体の量が
実用上問題にならない場合もあり得る。鋳鉄溶解炉に
は、耐火物としてＳｉＯ2 のスタンプ材を焼結したもの
が用いられるが、多くの実例について耐火物中のＺｎ量
（重量％）を調査した結果、表１に示すように、湯面高
さが１２００ｍｍ以下なら、Ｚｎの気体は耐火物の気孔
をほとんど通過しないことが判明した。Normally, Zn in the molten metal in the furnace is already in a gaseous state, and when it comes into contact with the refractory, it enters the pores of the refractory according to the pressure of the gas. That is, the higher the pressure of the gas, the greater the degree of penetration into the pores. However, depending on the pressure of the gas and the characteristics of the refractory, the amount of passing gas may not be a problem in practical use. As a cast iron melting furnace, a refractory obtained by sintering a stamp material of SiO 2 is used. As a result of investigating the Zn content (% by weight) in the refractory for many examples, as shown in Table 1, It was found that if the level of the molten metal was 1200 mm or less, Zn gas hardly passed through the pores of the refractory.
【０００６】[0006]
【表１】 [Table 1]
【０００７】ここで、表１は容量３０ｔの炉について、
湯面位置から炉底に向かって３００ｍｍごとに炉壁耐火
物から試料を採取し、侵入Ｚｎ量を分析した結果の一例
を示したものである。一般に、耐火物は物性上、一定の
通気率を持ち、この耐火物を通過する気体の量は圧力に
ほぼ比例して増加するものと考えられている。ところ
が、分析結果によれば、表１に示すように湯面高さ
（Ｈ）が１２００ｍｍ以下の場合には、耐火物中のＺｎ
の量は0.01〜0.02重量％程度で実用上問題にならないの
に対し、１２００ｍｍを超えると急増し約0.1 重量％に
達していた。これは鋳鉄溶解炉の耐火物の通気率と溶湯
の静圧との関係から、湯面高さが１２００ｍｍ以下と静
圧が低い場合には、耐火物に侵入するより上方の大気側
に逃げる速度が大きくなることによるものと考えられ
る。よって、炉の容量に関わらず湯面高さを常に１２０
０ｍｍ以下に抑えれば、耐火物に対するＺｎの影響を実
質的に回避した誘導炉を構成できる。Here, Table 1 shows a furnace having a capacity of 30 tons.
This is an example of a result obtained by collecting a sample from the furnace wall refractory every 300 mm from the molten metal surface position toward the furnace bottom and analyzing the amount of invading Zn. Generally, it is considered that a refractory has a certain air permeability in terms of physical properties, and the amount of gas passing through the refractory increases almost in proportion to the pressure. However, according to the analysis results, as shown in Table 1, when the surface level (H) is 1200 mm or less, Zn in the refractory
Is about 0.01 to 0.02% by weight and poses no practical problem, whereas when it exceeds 1200 mm, it rapidly increases to about 0.1% by weight. This is based on the relationship between the permeability of the refractory of the cast iron melting furnace and the static pressure of the molten metal. When the molten metal level is 1200 mm or less and the static pressure is low, the rate of escape to the atmosphere above the refractory enters Is thought to be due to the increase in Therefore, regardless of the capacity of the furnace, the level of
If it is suppressed to 0 mm or less, it is possible to configure an induction furnace in which the influence of Zn on the refractory is substantially avoided.
【０００８】[0008]
【実施例】図１はこの発明の実施例のるつぼ形誘導炉の
炉体形状を示すものである。図において、炉底から湯面
までの高さＨ1 は常に１２００ｍｍ以下に抑えられてお
り、その分、湯室内径Ｄ1 が大きくなって、図２の従来
例よりも全体に偏平な形状となっている。具体的な寸法
を例示すると、例えば５ｔ炉の場合、従来はＨ＝１２５
０ｍｍ、Ｄ＝９００ｍｍに対して、この発明では、例え
ばＨ1 ＝１０００ｍｍとする。その場合、Ｄ1 ＝１００
０ｍｍとなる。また、８ｔ炉の場合は、従来はＨ＝１５
７０ｍｍ、Ｄ＝１０００ｍｍに対して、この発明では、
例えばＨ1 ＝１１５０ｍｍ、Ｄ1 ＝１１７０ｍｍとす
る。このような構成によれば、溶湯の静圧がＺｎの気体
の耐火物への侵入の臨界値以下となって、Ｚｎの気体は
耐火物へ侵入する以前に湯面から逃げ、耐火物の寿命に
実用上ほとんど影響しなくなる。FIG. 1 shows a furnace body shape of a crucible induction furnace according to an embodiment of the present invention. In the figure, the height H 1 from the furnace bottom to the molten metal surface is always kept to 1200 mm or less, and accordingly, the diameter D 1 of the molten metal chamber is increased, and the overall shape is flatter than the conventional example of FIG. Has become. To illustrate specific dimensions, for example, in the case of a 5t furnace, conventionally, H = 125
In contrast to 0 mm and D = 900 mm, in the present invention, for example, H 1 = 1000 mm. In that case, D 1 = 100
0 mm. In the case of an 8t furnace, H = 15
For 70 mm and D = 1000 mm, in the present invention,
For example, H 1 = 1150 mm and D 1 = 1170 mm. According to such a configuration, the static pressure of the molten metal becomes equal to or less than the critical value of the penetration of the Zn gas into the refractory, and the Zn gas escapes from the surface of the molten metal before entering the refractory, and the life of the refractory is reduced. Has little effect on practical use.
【０００９】[0009]
【発明の効果】この発明によれば、容量が５ｔ以上の鋳
鉄溶解用誘導炉であっても、湯面の炉底からの許容高さ
を１２００ｍｍ以下として誘導炉を構成することによ
り、Ｚｎを含む鋼材を溶解した場合にも、溶湯の静圧に
基づくＺｎの気体の圧力を耐火物の気孔への侵入が実用
上問題にならない低レベルに保ち、耐火物の寿命を大幅
に延ばすことができる。According to the present invention, a casting having a capacity of 5 tons or more is provided.
Even in the induction furnace for melting iron, by configuring the induction furnace such that the allowable height of the molten metal surface from the furnace bottom is 1200 mm or less, even when the steel material containing Zn is melted, Zn based on the static pressure of the molten metal is used. The pressure of the gas can be kept at a low level where the penetration of the refractory into the pores does not pose a practical problem, and the life of the refractory can be greatly extended.
【図面の簡単な説明】[Brief description of the drawings]
【図１】この発明の実施例のるつぼ形誘導炉の炉体形状
を示す概略縦断面図である。FIG. 1 is a schematic vertical sectional view showing a furnace body shape of a crucible induction furnace according to an embodiment of the present invention.
【図２】従来のるつぼ形誘導炉の炉体形状を示す概略縦
断面図である。FIG. 2 is a schematic vertical sectional view showing a furnace body shape of a conventional crucible-type induction furnace.
１ 耐火物 ２ 誘導加熱コイル 1 refractory 2 induction heating coil
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大森 次治 神奈川県川崎市川崎区田辺新田１番１号 富士電機株式会社内 (72)発明者 川崎 道夫 神奈川県川崎市川崎区田辺新田１番１号 富士電機株式会社内 (56)参考文献 「強靭鋳鉄生産技術標準 溶解作業 （低周波誘導炉）」社団法人日本強靭鋳 鉄協会（昭48．４．20) (58)調査した分野(Int.Cl.7，ＤＢ名) F27B 14/06 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsujiharu Omori 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Michio Kawasaki 1 Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Fuji Electric Co., Ltd. (56) Reference “Tough cast iron production technology standard melting operation (low frequency induction furnace)” Japan Strong Tough Iron Association (48.48.20) (58) Int.Cl. 7 , DB name) F27B 14/06
Claims (1)
た鋳鉄溶解用誘導炉において、 容量が５ｔ以上で、かつ湯面の炉底からの許容高さを12
00ｍｍ以下に設定したことを特徴とする鋳鉄溶解用誘導
炉。1. An induction furnace for melting cast iron using a stamp material of SiO 2 as a refractory, having a capacity of 5 t or more and an allowable height of the molten metal surface from the furnace bottom of 12 mm.
An induction furnace for melting cast iron, characterized in that it is set to not more than 00 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28359791A JP3147185B2 (en) | 1991-10-03 | 1991-10-03 | Induction furnace for melting cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28359791A JP3147185B2 (en) | 1991-10-03 | 1991-10-03 | Induction furnace for melting cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0599576A JPH0599576A (en) | 1993-04-20 |
| JP3147185B2 true JP3147185B2 (en) | 2001-03-19 |
Family
ID=17667566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28359791A Expired - Lifetime JP3147185B2 (en) | 1991-10-03 | 1991-10-03 | Induction furnace for melting cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3147185B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8189847B2 (en) * | 2008-08-21 | 2012-05-29 | Jetvox Acoustic Corp. | Dual-frequency coaxial earphones with shared magnet |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3584492B2 (en) * | 1994-07-12 | 2004-11-04 | 富士電機システムズ株式会社 | Dezincing induced dissolution method |
| JP5578112B2 (en) * | 2011-03-02 | 2014-08-27 | 新日鐵住金株式会社 | Induction heating device cooling method |
-
1991
- 1991-10-03 JP JP28359791A patent/JP3147185B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 「強靭鋳鉄生産技術標準 溶解作業（低周波誘導炉）」社団法人日本強靭鋳鉄協会（昭４８．４．２０） |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8189847B2 (en) * | 2008-08-21 | 2012-05-29 | Jetvox Acoustic Corp. | Dual-frequency coaxial earphones with shared magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0599576A (en) | 1993-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ratcliffe | The measurement of small density changes in solids | |
| US4550412A (en) | Carbon-free induction furnace | |
| US3548948A (en) | Procedure for chill casting beryllium composite | |
| Schramm et al. | The alloy systems uranium-tungsten, uranium-tantalum and tungsten-tantalum | |
| JP3147185B2 (en) | Induction furnace for melting cast iron | |
| GB2110244A (en) | Method equipment and regulating means for recovering metal carbide scrap by alloying | |
| Čermák et al. | Diffusion of 65Zn in Mg and in Mg–x Al solid solutions | |
| Pindar et al. | Assessment of Si–O equilibria and nonmetallic inclusion characteristics in high silicon steels | |
| EP0529074A1 (en) | Method of judging carbon equivalent, carbon content, and silicon content of cast iron and estimating physical and mechanical properties thereof, and cooling curve measuring cup used for said method | |
| Gesmundo et al. | The corrosion of iron in pure SO2 under different pressures at 700° C | |
| JP4287594B2 (en) | Treatment of aluminum alloy melt | |
| Taylor et al. | Solid solubility limits of Y and Sc in the elements W, Ta, Mo, Nb, and Cr | |
| RU2048590C1 (en) | Steel | |
| Ledjeff et al. | Influence of metal grain growth on the oxidation behavior of a 25Cr-20Ni steel | |
| Winkler | The theory and practice of vacuum melting | |
| Candan et al. | Wettability of aluminum–magnesium alloys on silicon carbide substrates | |
| JPS57118849A (en) | Abrasion resistant centrifugally cast casting of cast iron and its production | |
| US4049250A (en) | Crucible | |
| EP0688879B1 (en) | High vacuum apparatus member and vacuum apparatus | |
| GB1220478A (en) | Improvements in or relating to crucibles | |
| Jehn | Suspension balance apparatus for the investigation of the oxidation of refractory and platinum metals at high temperatures and low pressures | |
| US5223125A (en) | Oxygen sensor for aluminum killed, high silicon steel melts | |
| JPS56150155A (en) | Preparation of ferrous sintered material | |
| Miroshnikov et al. | Oxidation resistance of low-porosity bronzes | |
| McMahon et al. | The vacuum fusion method for determining minute quantities of gases in metals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080112 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090112 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100112 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110112 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110112 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120112 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120112 Year of fee payment: 11 |