JPH06114498A - Inoculation method - Google Patents
Inoculation methodInfo
- Publication number
- JPH06114498A JPH06114498A JP29379392A JP29379392A JPH06114498A JP H06114498 A JPH06114498 A JP H06114498A JP 29379392 A JP29379392 A JP 29379392A JP 29379392 A JP29379392 A JP 29379392A JP H06114498 A JPH06114498 A JP H06114498A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- inoculant
- inoculation
- flow
- cast iron
- 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.)
- Pending
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は球状黒鉛鋳鉄を鋳型へ注
湯する際に行う注湯流接種に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pouring flow inoculation when pouring spheroidal graphite cast iron into a mold.
【０００２】[0002]
【従来の技術】知られるように球状黒鉛鋳鉄の製造にあ
たっては、溶湯に対するチルの防止、黒鉛粒数の増加、
フェライト化促進等を目的として接種が行われ、従来の
接種方法は（イ）取鍋接種、（ロ）注湯流接種、（ハ）
鋳型内接種、（ニ）細いパイプ中に接種剤を充填したワ
イヤーを用いるワイヤー接種等に分類することができ
る。As is known, in the production of spheroidal graphite cast iron, prevention of chill against molten metal, increase in the number of graphite particles,
Inoculation is carried out for the purpose of accelerating ferrite formation, and the conventional inoculation methods are (a) ladle inoculation, (b) pouring pouring inoculation, (c)
It can be classified into in-mold inoculation and (d) wire inoculation using a wire filled with an inoculant in a thin pipe.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の各接種
法についてはそれぞれ次のような問題があった。 （イ）取鍋接種 取鍋接種は接種剤の溶湯へのとけ込みが良好で、かつ反
応したノロを浮上させるための鎮静時間をとることがで
きるという利点がある反面、接種から注湯までの時間で
フェーディングし、接種効果が消失するという問題があ
る （ロ）注湯流接種 注湯流接種は注湯直前に行うのでフェーディングがな
く、接種効果が大きいという利点がある反面、接種剤を
溶湯流の表面に落下添加するため接種剤が溶湯の流れの
表面に浮き、接種剤の溶湯へのとけ込みが悪く溶け残り
が黒皮表面に残り、強度延性が低下するだけでなく、過
剰の接種剤を使用するため無駄が多いという問題があ
る。 （ハ）鋳型内接種 鋳型内接種は接種効果が大きいという利点がある反面、
接種剤と溶湯との接触が短時間であり溶け残りが生じる
という問題がある。 （ニ）ワイヤー接種 ワイヤー接種は溶湯中に浸漬しかつ送り量を調節するこ
とができるので溶け込みが良好で接種効果が大きいとい
う利点がある反面、ワイヤー接種剤が高価であり、コス
ト高となるという問題がある。本発明は以上の従来の各
接種法における問題に鑑みてなされたものであって、接
種剤の良好な溶け込みを得て溶け残りを低減することが
でき、かつ接種剤の添加効率を向上することができると
共に、安価に実施することができる接種方法を提供する
ことを目的とする。However, each of the conventional inoculation methods has the following problems. (A) Ladle inoculation Ladle inoculation has the advantage that the inoculant melts into the melt well and that it has a sedation time to allow the reacted slag to rise, but on the other hand, from inoculation to pouring There is a problem of fading over time and the inoculation effect disappearing. (B) Pouring pouring inoculation Since pouring pouring inoculation is performed immediately before pouring, there is no fading and the inoculation effect is large, but the inoculation As the inoculant floats on the surface of the molten metal because it is added to the surface of the molten metal, the melt of the inoculant into the molten metal is poor and the unmelted residue remains on the surface of the black skin, which not only decreases the strength and ductility, but also increases the excess. There is a problem that there is a lot of waste because the inoculant is used. (C) In-mold inoculation While in-mold inoculation has the advantage of having a large inoculation effect,
There is a problem that the contact between the inoculant and the molten metal is in a short time and unmelted residue is left. (D) Wire inoculation Wire inoculation has the advantages of good penetration and a large inoculation effect because it can be immersed in molten metal and the feed rate can be adjusted, but on the other hand, wire inoculants are expensive and costly. There's a problem. The present invention has been made in view of the problems in the above-mentioned conventional inoculation methods, and it is possible to obtain good dissolution of the inoculant and reduce the undissolved residue, and to improve the addition efficiency of the inoculant. It is an object of the present invention to provide an inoculation method that can be carried out at a low cost.
【０００４】[0004]
【課題を解決するための手段】本発明者らは上述した課
題を達成するべく種々検討し、その結果従来の注湯流接
種においてとけ込み性が悪い原因は、接種剤が溶湯の表
面に落下添加されるため溶湯の表面張力で接種剤が溶湯
表面に浮いたまま鋳型内に流れ込むことに起因すること
を見出し、本発明に想到した。すなわち本発明の接種方
法は、球状黒鉛鋳鉄溶湯の鋳型への注湯時に、溶湯流に
対して接種剤の添加を行う接種方法において、耐熱性材
料を用いてなるパイプを注湯流中に浸漬し、そのパイプ
を通して粒状接種剤を溶湯流に添加することを特徴とす
る。上記耐熱性材料としては耐熱性セラミックスがあり
例えばＡｌＮ、Ａｌ2Ｏ3などを使用することができる。
また上記耐熱性材料を用いてなるパイプは着脱可能とし
て配置することができる。さらに耐熱性材料としては高
耐熱金属を用いることができ、その場合は高耐熱金属か
ら溶湯への金属元素の溶け込みについての対策が必要と
なる。Means for Solving the Problems The inventors of the present invention have conducted various studies to achieve the above-mentioned problems, and as a result, the cause of poor meltability in the conventional pouring flow inoculation is that the inoculant drops onto the surface of the molten metal. The present inventors have found that it is caused by the fact that the inoculant floats on the surface of the molten metal and flows into the mold due to the surface tension of the molten metal because it is added. That is, in the inoculation method of the present invention, when pouring the spheroidal graphite cast iron melt into the mold, in the inoculation method in which the inoculant is added to the molten metal flow, the pipe made of the heat resistant material is immersed in the molten metal flow. Then, the granular inoculant is added to the molten metal stream through the pipe. As the heat resistant material, there are heat resistant ceramics, and for example, AlN, Al 2 O 3 or the like can be used.
Further, the pipe made of the above heat resistant material can be arranged detachably. Further, a high heat-resistant metal can be used as the heat-resistant material, and in that case, it is necessary to take measures against the dissolution of the metal element from the high heat-resistant metal into the molten metal.
【０００５】[0005]
【作用】本発明の接種方法によれば、耐熱性材料を用い
てなるパイプにより溶湯中に添加された接種剤は、一旦
溶湯の中に添加されると、周囲の溶湯の十分な熱を受け
て溶解しながら鋳型内へ流入してゆくので溶け残りは大
幅に低減される。したがって得られる鋳物における未溶
解接種剤による異物かみは減少し、かつ接種剤の使用量
を節約することができる。また本発明方法により得られ
る球状黒鉛鋳鉄の組織については、接種効果が良好なこ
とから黒鉛粒数が増加すると共にチルが減少するという
結果を得ることができる。According to the inoculation method of the present invention, the inoculant added to the molten metal through the pipe made of the heat-resistant material, once added to the molten metal, receives sufficient heat of the surrounding molten metal. As it melts and flows into the mold, the unmelted residue is greatly reduced. Therefore, foreign matter biting by the undissolved inoculant in the obtained casting is reduced, and the amount of inoculant used can be saved. With respect to the structure of the spheroidal graphite cast iron obtained by the method of the present invention, it is possible to obtain the result that the chill decreases as the number of graphite particles increases because the inoculation effect is good.
【０００６】[0006]
【実施例】以下に本発明の実施例について説明する。図
１は本発明の一実施例の態様を概念図として示し、取鍋
１から鋳型２に球状黒鉛鋳鉄溶湯３が供給される。その
球状黒鉛鋳鉄溶湯３の溶湯流には耐熱性材料を用いてな
るパイプ４の先端部が浸漬され、タンク５内に貯留され
た接種剤６がスクリューコンベア７によりパイプ４先端
部に送給され、その先端部から注湯流中に接種剤６が添
加される。EXAMPLES Examples of the present invention will be described below. FIG. 1 shows an embodiment of the present invention as a conceptual diagram, in which a spheroidal graphite cast iron melt 3 is supplied from a ladle 1 to a mold 2. The tip of a pipe 4 made of a heat-resistant material is immersed in the melt flow of the spheroidal graphite cast iron melt 3, and the inoculant 6 stored in the tank 5 is fed to the tip of the pipe 4 by a screw conveyor 7. The inoculant 6 is added into the pouring flow from its tip.
【０００７】実施例１ 表１に示す条件で図１に示す本発明の接種方法を実施し
て球状黒鉛鋳鉄試験片を１０個製造した。本発明の接種
方法の実施にあたっては、耐熱性材料を用いてなるパイ
プはＡｌＮにより製作し、そのパイプを溶湯流中に浸漬
し、そのパイプを通して接種剤を添加した。Example 1 Ten spheroidal graphite cast iron test pieces were manufactured by carrying out the inoculation method of the present invention shown in FIG. 1 under the conditions shown in Table 1. In carrying out the inoculation method of the present invention, a pipe made of a heat-resistant material was made of AlN, the pipe was immersed in a molten metal stream, and the inoculant was added through the pipe.
【０００８】[0008]
【表１】 [Table 1]
【０００９】実施例２ 他は実施例１と同様にし、接種剤の添加量を対溶湯比
０．２％として球状黒鉛鋳鉄を製造した。Example 2 In the same manner as in Example 1 except for the above, a spheroidal graphite cast iron was produced with the addition amount of the inoculant being 0.2% of the molten metal ratio.
【００１０】比較例１ 他は実施例１と同様にし、接種剤の添加方法を本発明方
法によらず、接種剤を溶湯表面に落下添加する従来法と
して球状黒鉛鋳鉄を製造した。Comparative Example 1 In the same manner as in Example 1 except for the above, spheroidal graphite cast iron was produced as a conventional method of dropping the inoculant onto the surface of the molten metal without adding the inoculant to the method of the present invention.
【００１１】比較例２ 他は比較例１と同様にし、接種剤の添加量を対溶湯比
０．２％として球状黒鉛鋳鉄を製造した。Comparative Example 2 In the same manner as in Comparative Example 1 except for the above, a spheroidal graphite cast iron was produced with the amount of the inoculant added to the molten metal ratio being 0.2%.
【００１２】以上の各実施例、比較例により得られた球
状黒鉛鋳鉄を用いて、 接種剤未溶解により鋳物表面
に１．０mm以上の異物かみが発生した試験片の数、及び
組織を調査した。調査の結果を表２及び図２から図５
に示す。Using the spheroidal graphite cast iron obtained in each of the above Examples and Comparative Examples, the number of test pieces in which foreign matter bite of 1.0 mm or more was generated on the surface of the casting due to undissolved inoculant and the structure were investigated. . The results of the survey are shown in Table 2 and FIGS.
Shown in.
【００１３】[0013]
【表２】 [Table 2]
【００１４】表２は表面の異物かみの個数を係数したも
ので、この表からわかるように、本発明の実施例では得
られる球状黒鉛鋳鉄試験片に異物かみは認められない
か、小数で有るのに対し、比較例のものでは多数の異物
かみが認められた。また図２は実施例１、図３は実施例
２、図４は比較例１、図５は比較例２の組織写真で、本
発明の実施例で得られる球状黒鉛鋳鉄試験片の組織は黒
鉛粒数が多く、チルが見られないのに対し、比較例で得
られる球状黒鉛鋳鉄試験片の組織は黒鉛粒数が少なく、
チルも見られる。このように本発明では異物かみを防
ぎ、黒鉛粒数を増し、チルを発生させないなどの効果が
得られる。Table 2 is a coefficient of the number of foreign matter bites on the surface. As can be seen from this table, the spheroidal graphite cast iron test pieces obtained in the examples of the present invention have no foreign matter bites or are a small number. On the other hand, many foreign matter bites were recognized in the comparative example. 2 is a photograph of Example 1, FIG. 3 is a photograph of Example 2, FIG. 4 is a photograph of Comparative Example 1, and FIG. 5 is a photograph of Comparative Example 2. The texture of the spheroidal graphite cast iron test pieces obtained in the examples of the present invention is graphite. The number of grains is large, while chill is not seen, the structure of the spheroidal graphite cast iron test piece obtained in Comparative Example has a small number of graphite grains,
You can also see chill. As described above, according to the present invention, it is possible to prevent foreign matter biting, increase the number of graphite particles, and prevent chills.
【００１５】[0015]
【発明の効果】以上のように本発明の接種方法によれ
ば、耐熱性材料を用いてなるパイプを注湯流中に浸漬
し、そのパイプを通して粒状接種剤を溶湯流に添加する
ようにしたので、接種効果の良好な接種を安価に実施し
て、黒鉛粒数が多く、チル及び異物かみの少ない球状黒
鉛鋳鉄を得ることができる。As described above, according to the inoculation method of the present invention, the pipe made of the heat-resistant material is immersed in the pouring flow, and the granular inoculant is added to the pouring flow through the pipe. Therefore, it is possible to obtain the spheroidal graphite cast iron having a large number of graphite particles and less chill and foreign matter biting by performing the inoculation having a good inoculating effect at a low cost.
【図１】 本発明の一実施例の概念図である。FIG. 1 is a conceptual diagram of an embodiment of the present invention.
【図２】 本発明の実施例１により得られた球状黒鉛鋳
鉄の組織を示す写真である。FIG. 2 is a photograph showing the structure of spheroidal graphite cast iron obtained in Example 1 of the present invention.
【図３】 本発明の実施例２により得られた球状黒鉛鋳
鉄の組織を示す写真である。FIG. 3 is a photograph showing the structure of spheroidal graphite cast iron obtained in Example 2 of the present invention.
【図４】 本発明の実施例に対する比較例１により得ら
れた球状黒鉛鋳鉄の組織を示す写真である。FIG. 4 is a photograph showing the structure of spheroidal graphite cast iron obtained in Comparative Example 1 with respect to the example of the present invention.
【図５】 本発明の実施例に対する比較例２により得ら
れた球状黒鉛鋳鉄の組織を示す写真である。FIG. 5 is a photograph showing the structure of spheroidal graphite cast iron obtained in Comparative Example 2 with respect to the example of the present invention.
１・・・取鍋、２・・・鋳型、３・・・球状黒鉛鋳鉄溶
湯、４・・・パイプ、５・・・タンク、６・・・接種
剤、７・・・スクリューコンベア。1 ... Ladle, 2 ... Mold, 3 ... Spheroidal graphite cast iron molten metal, 4 ... Pipe, 5 ... Tank, 6 ... Inoculant, 7 ... Screw conveyor.
Claims (1)
溶湯流に対して接種剤の添加を行う接種方法において、
耐熱性材料を用いてなるパイプを注湯流中に浸漬し、そ
のパイプを通して粒状接種剤を溶湯流に添加することを
特徴とする接種方法。1. When pouring molten spheroidal graphite cast iron into a mold,
In the inoculation method of adding the inoculant to the molten metal flow,
An inoculation method, which comprises immersing a pipe made of a heat-resistant material in a pouring flow, and adding a granular inoculant to the molten metal flow through the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29379392A JPH06114498A (en) | 1992-10-07 | 1992-10-07 | Inoculation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29379392A JPH06114498A (en) | 1992-10-07 | 1992-10-07 | Inoculation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06114498A true JPH06114498A (en) | 1994-04-26 |
Family
ID=17799237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29379392A Pending JPH06114498A (en) | 1992-10-07 | 1992-10-07 | Inoculation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06114498A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396402C (en) * | 2006-09-06 | 2008-06-25 | 蒋祖滨 | Improved version new technique of crashing method inside ladle |
| WO2016004834A1 (en) * | 2014-07-11 | 2016-01-14 | 宁夏共享装备有限公司 | Automated in-stream inoculation apparatus for iron discharged from electric furnace and automated in-stream inoculation method |
| CN108097898A (en) * | 2018-02-11 | 2018-06-01 | 江西亿丰精密铸造有限公司 | A kind of spheroidal graphite cast-iron instant inoculation simple system |
-
1992
- 1992-10-07 JP JP29379392A patent/JPH06114498A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396402C (en) * | 2006-09-06 | 2008-06-25 | 蒋祖滨 | Improved version new technique of crashing method inside ladle |
| WO2016004834A1 (en) * | 2014-07-11 | 2016-01-14 | 宁夏共享装备有限公司 | Automated in-stream inoculation apparatus for iron discharged from electric furnace and automated in-stream inoculation method |
| CN108097898A (en) * | 2018-02-11 | 2018-06-01 | 江西亿丰精密铸造有限公司 | A kind of spheroidal graphite cast-iron instant inoculation simple system |
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