JP2021045795A5 - Method for manufacturing spheroidal graphite cast iron castings - Google Patents
Method for manufacturing spheroidal graphite cast iron castings Download PDFInfo
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- JP2021045795A5 JP2021045795A5 JP2020217938A JP2020217938A JP2021045795A5 JP 2021045795 A5 JP2021045795 A5 JP 2021045795A5 JP 2020217938 A JP2020217938 A JP 2020217938A JP 2020217938 A JP2020217938 A JP 2020217938A JP 2021045795 A5 JP2021045795 A5 JP 2021045795A5
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- JP
- Japan
- Prior art keywords
- cast iron
- molten metal
- spheroidal graphite
- temperature
- graphite cast
- 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.)
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- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910001141 Ductile iron Inorganic materials 0.000 title claims description 8
- 239000002184 metal Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 229910001018 Cast iron Inorganic materials 0.000 claims description 7
- 238000011081 inoculation Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims 1
Description
本発明は、球状黒鉛鋳鉄の鋳造品の製造方法に係る。より詳細には、熱処理を行わないアズキャストの状態で、チルが無くより超微細化しかつ均一化した球状化黒鉛の数が従来よりも多く以上存在し、引張強度・伸びその他の特性の向上が期待される球状黒鉛鋳鉄の鋳造品の製造方法に関する。 The present invention relates to casting of manufacturing how the spheroidal graphite cast iron. More specifically, in the ascast state without heat treatment, the number of spheroidized graphite that is more ultrafine and uniform without chill exists more than before, and the tensile strength, elongation and other properties are improved. expectations regarding production how of the casting of spheroidal graphite cast iron to be.
本発明は、鋳鉄からなる原料を加熱溶解して溶湯を得る溶解工程、球状化処理を行う球状化処理工程、接種を行う接種工程、前記接種後の溶湯を、注湯し金型内のゲートを介して製品空間に充填する鋳込み工程、を有する球状黒鉛鋳鉄の鋳造品の製造方法において、前記溶解工程から鋳込み工程の間において、前記鋳造品の融解時発生窒素量が０．９ｐｐｍ（質量）以下になるように窒素量を調整し、前記注湯を（融点＋１０℃）以上（融点＋４０℃）以下の温度で行い、前記ゲート通過時における前記原料の温度を１１４０〜１１７０℃とすることを特徴とする球状黒鉛鋳鉄の鋳造品の製造方法である。前記注湯後液相線温度を通過するまでの溶湯の冷却速度は２０℃／秒以上とすることが好ましい。鋳鉄からなる原料を加熱溶解して溶湯を得、前記溶湯を１５００℃以上の所定の温度まで加熱後、加熱を停止しその温度に一定時間保持して前記溶湯から酸素を除去し、次いで、前記溶湯を徐冷することにより前記溶湯中の窒素を減少させ、次いで、球状化処理、接種及び鋳込みを行うことが好ましい。 The present invention is dissolved to obtain a molten metal by heating and dissolving raw materials composed of cast iron, spheroidizing treatment step of performing spheroidizing treatment, inoculation step for inoculating the melt after the inoculation, the gate of the pouring to mold In the method for producing a cast product of spheroidal graphite cast iron having a casting step of filling the product space through the above, the amount of nitrogen generated during melting of the cast product is 0.9 ppm (mass) between the melting step and the casting step. The amount of nitrogen is adjusted so as to be as follows, the pouring is performed at a temperature of (melting point + 10 ° C.) or higher (melting point + 40 ° C.), and the temperature of the raw material when passing through the gate is 1140 to 1170 ° C. It is a method for producing a cast product of spheroidal graphite cast iron, which is a feature. The cooling rate of the molten metal until it passes the liquidus temperature after pouring is preferably 20 ° C./sec or more. A raw material made of cast iron is heated and melted to obtain a molten metal, the molten metal is heated to a predetermined temperature of 1500 ° C. or higher, heating is stopped and the temperature is maintained for a certain period of time to remove oxygen from the molten metal, and then the molten metal is removed. It is preferable to reduce the nitrogen in the molten metal by slowly cooling the molten metal, and then perform spheroidizing treatment, inoculation and casting.
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020217938A JP7220428B2 (en) | 2020-12-25 | 2020-12-25 | Method for manufacturing spheroidal graphite cast iron casting |
| JP2022184004A JP2023010826A (en) | 2020-12-25 | 2022-11-17 | Semi-solidified casting method of spheroidal graphite cast iron and product of semi-solidified casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020217938A JP7220428B2 (en) | 2020-12-25 | 2020-12-25 | Method for manufacturing spheroidal graphite cast iron casting |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2016172355A Division JP6823311B2 (en) | 2016-09-04 | 2016-09-04 | Chill-free spheroidal graphite cast iron semi-solidified mold casting |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2022184004A Division JP2023010826A (en) | 2020-12-25 | 2022-11-17 | Semi-solidified casting method of spheroidal graphite cast iron and product of semi-solidified casting |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2021045795A JP2021045795A (en) | 2021-03-25 |
| JP2021045795A5 true JP2021045795A5 (en) | 2021-05-06 |
| JP7220428B2 JP7220428B2 (en) | 2023-02-10 |
Family
ID=74877286
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2020217938A Active JP7220428B2 (en) | 2020-12-25 | 2020-12-25 | Method for manufacturing spheroidal graphite cast iron casting |
| JP2022184004A Pending JP2023010826A (en) | 2020-12-25 | 2022-11-17 | Semi-solidified casting method of spheroidal graphite cast iron and product of semi-solidified casting |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2022184004A Pending JP2023010826A (en) | 2020-12-25 | 2022-11-17 | Semi-solidified casting method of spheroidal graphite cast iron and product of semi-solidified casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JP7220428B2 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5122640A (en) * | 1974-08-19 | 1976-02-23 | Mitsui Shipbuilding Eng | KYUJOKOKUENCHUTETSUSEIYOSETSUBO |
| JPH0890191A (en) * | 1994-09-26 | 1996-04-09 | Leotec:Kk | Method for die-casting solid-liquid coexistence in spheroidal graphite cast iron |
| JPH09239514A (en) * | 1996-03-01 | 1997-09-16 | Kobe Steel Ltd | Die to be used for die casting of cast iron |
| JP2006063396A (en) * | 2004-08-27 | 2006-03-09 | Takatsugu Kusakawa | Method for producing thin spheroidal graphite cast iron product |
| WO2010103641A1 (en) * | 2009-03-12 | 2010-09-16 | 虹技株式会社 | Process for production of semisolidified slurry of iron-base alloy; process for production of cast iron castings by using the process, and cast iron castings |
| JP5779749B2 (en) * | 2011-04-11 | 2015-09-16 | 地方独立行政法人 岩手県工業技術センター | Cast iron material manufacturing method, cast iron material and die casting machine sleeve |
| JP5825583B2 (en) * | 2011-09-15 | 2015-12-02 | 国立大学法人東北大学 | Die casting product and die casting method |
| JP6452188B2 (en) * | 2013-05-24 | 2019-01-16 | 国立大学法人東北大学 | High pressure casting method |
-
2020
- 2020-12-25 JP JP2020217938A patent/JP7220428B2/en active Active
-
2022
- 2022-11-17 JP JP2022184004A patent/JP2023010826A/en active Pending
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