CN1323185C - Alloy special for precision casting and its production technology - Google Patents
Alloy special for precision casting and its production technology Download PDFInfo
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- CN1323185C CN1323185C CNB2005100127200A CN200510012720A CN1323185C CN 1323185 C CN1323185 C CN 1323185C CN B2005100127200 A CNB2005100127200 A CN B2005100127200A CN 200510012720 A CN200510012720 A CN 200510012720A CN 1323185 C CN1323185 C CN 1323185C
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to alloy special for precision casting, which comprises 7 to 10% of Mg, 2.0 to 5.0% of RE, 2.0 to 4.0% of Ca, 2.0 to 5.0% of Ba, at most of 44.0% of Si and Fe as the rest. The present invention has a production process that raw materials, such as celite, rare earth ore concentrate, coke and steel scrap are added in a mining thermal furnace for smelting according to a weight compounding ratio; rare earth ferrosilicon alloy, silicon calcium alloy and ferro-silicon alloy are melted in a medium-frequency induction furnace according to a weight compounding ratio. Alloy melting liquid in the mining thermal furnace is firstly added in a magnesium pressing bag, and a core-spun yarn head which is filled with alloy waste or silicon barium alloy which is a raw material is then sent in the magnesium pressing bag for feeding wires in uniform speed; alloy of rare earth, silicon and calcium in the intermediate frequency furnace is proportionally added, magnesium ingots are pressed in, the alloy melting liquid is molded, cooled, crushed and sieved, and thus, the alloy special for precision casting is obtained. The present invention uses elements of Ca and Ba to promote a spheroidizing effect and an inoculation effect, and has a strong self inoculation core generating capability and a deterioration resisting capability. Thus, the number of graphite balls can be obviously increased, a spheroidizing level can be improved, chilling tendency is reduced, and the present invention is particularly suitable for the precision casting of nodular iron with high quality.
Description
Technical field
The present invention relates to a kind of production technique that in the spheroidal graphite casting, plays the alloy special for precision casting of nodularization and inoculation(effect).
Background technology
Precision casting is a kind ofly to exempt to process or cast product that process redundancy is very little, and specification of quality is higher, produces high-quality magnesium iron precision casting and just must adopt good nodulizing agent.Employed in the market nodulizing agent, most employing rare earth magnesium ferrosilicon alloy, because this class nodulizing agent breeds living nuclear capability certainly and anti-decaying spheroidisation ability is relatively poor, the number of graphite ball of formation is few, foundry goods is prone to the spoken parts in traditional operas phenomenon, can not satisfy the particular requirement of high quality precision casting to nodulizing agent.
Summary of the invention
The production technique that the purpose of this invention is to provide a kind of alloy special for precision casting.This alloy adds elements such as calcium, barium in rare earth magnesium ferrosilicon alloy, can strengthen spheroidization in the spheroidal graphite casting, improves from breeding living nuclear capability and anti-decaying spheroidisation ability, satisfies the particular requirement of high quality precision casting to nodulizing agent.
Mg7-10%, RE2.0-5.0%, Ca2.0-4.0%, Ba2.0-5.0%, Si≤44.0%, Fe surplus in the alloy special for precision casting of the present invention.
The present invention adopts the hydrothermal solution coproduction to add injection feeding technology and produces alloy special for precision casting, and its production technique is:
With material silex, rare earth ore concentrate, coke, steel cuttings according to weight proportion 0.8-1.5: 0.01-0.4: 0.4-0.8: 0.4-0.8 mixes, add in the hot stove in ore deposit continuously, by self baking electrode electric current is imported melting batch and smelt, tapping temperature is controlled at 1500～1600 ℃; Rare earth ferrosilicon alloy, silicocalcium and ferro-silicon are mixed the back according to weight proportion 70-180: 45-150: 0-115 melt in medium-frequency induction furnace, tapping temperature is controlled at 1500～1700 ℃; Earlier the alloy liquation in the hot stove in ore deposit is added and press the magnesium bag, to the alloy special for precision casting tankage be housed respectively again and press at the uniform velocity line feeding in the magnesium bag or/and the cored-wire head of raw silicon barium alloy is sent into, wire-feeding velocity is controlled at 0.2～1m/s, and feed quantity is the 10-20% of the hot stove liquation in ore deposit; Rare earth silicon-calcium alloy with the medium-frequency induction furnace fusing in line feeding adds pressure magnesium bag according to 10～30% of ore deposit hot stove liquid alloy weight; at last according to pressing magnesium technology to be pressed into magnesium ingot; alloy per ton adds MAGNESIUM METAL 100～140kg; alloy in MAGNESIUM METAL and the bag reacts under nitrogen protection; temperature of reaction is controlled at 1250～1450 ℃; time is controlled at 150～200s: after pressing the magnesium operation to finish; 1-5% according to total weight alloy adds in the pressure magnesium bag with rustless dry broken bloom; after continuing inflation 100-150s; with alloy liquation injection molding; cooling; broken; screening promptly gets alloy special for precision casting.
The present invention utilizes the disinthibite outburst of Mg element of Ca, utilizes the Ba element to remove to promote nodularization and pregnant effect, has stronger living nuclear capability and the anti-decaying spheroidisation ability of breeding certainly.Adopt this alloy special for precision casting can significantly increase number of graphite ball, improve nodulizing grade, reduce chilling tendency, be particularly suitable for high-quality magnesium iron precision casting.Employing is based on the hot stove in ore deposit, intermediate frequency furnace be assist, novel process that injection feeding technology replenishes, can effectively utilize the tankage of alloy, significantly reduce production costs.
Embodiment
The present invention adopts the hot stove in 3200KVA ore deposit, 0.5T medium-frequency induction furnace and feeding wire machine combination producing alloy special for precision casting.
Embodiment 1:
Alloy special for precision casting product main component requires: Mg7.5-8.5%, RE3.0-4.0%, Ca2.5-3.5%, Ba3.0-4.0%, Si≤44.0%, Fe surplus.
Production technique is as follows:
1, with 1.0T silica, 0.04T rare earth ore concentrate, 0.65T coke, 0.52T steel cuttings, mix according to weight proportion, add in the hot stove in ore deposit continuously, with voltage control at 80-90V, current control is at 24000-26000A, through the smelting of about 100min, to prepare to come out of the stove, tapping temperature is controlled at 1500～1600 ℃.
2, behind the about 20min of the hot stove energising in ore deposit, 125kg rare earth ferrosilicon alloy, 99kg silicocalcium, 6kg ferro-silicon are mixed the adding medium-frequency induction furnace, power transfers to 180KW and carries out melting.In the melting process, furnace charge constantly be depressed, to accelerate burn-off rate.When 70min, furnace charge all melts approximately, when the alloy melt temperature reaches 1500-1700 ℃ in the stove, prepares to come out of the stove.
When adopting medium-frequency induction furnace fusing rare earth silicon-calcium alloy, according to the capacity of medium-frequency induction furnace, add rare earth alloy and silicocalcium in proportion after, surplus can be replenished ferro-silicon, silicone content is controlled at 47～50% in the rare earth silicon-calcium alloy.
3, the alloy liquation in the hot stove in ore deposit is put into pressure magnesium bag, skimmed, the back temperature of skimming is controlled at 1450-1550 ℃, and alloy liquation weight is about 1.0T; To press the magnesium bag to hang in and press in the magnesium hole; at this moment adopt the cored-wire head that feeding wire machine will be equipped with Si-Ba alloy to send into beginning line feeding in the pressure magnesium bag; wire-feeding velocity is controlled at 0.5m/s; feed quantity 150kg; simultaneously the about 230kg of alloy liquation in the medium-frequency induction furnace is put into and press the magnesium bag; inflated with nitrogen stirs 1min; liquation is mixed; metal magnesium ingot with 120kg is pressed in the bag then; MAGNESIUM METAL is reacted under nitrogen protection with the interior alloy of bag; temperature of reaction is controlled at 1250-1450 ℃; after pressing the magnesium operation to finish, rustless dry broken bloom is added in the pressure magnesium bag according to 3% of total weight alloy, after continuing to inflate 100-150s; with alloy liquation injection molding; cooling; broken; screening promptly gets alloy special for precision casting.
Through check, every technical indicator all meets the quality product technical requirements.
Embodiment 2:
Alloy special for precision casting product main component requires: Mg8.5-9.5%, RE2.0-3.0%, Ca2.0-3.0%, Ba2.0-3.0%, Si≤44.0%, Fe surplus.
Production technique is as follows:
1, with 1.0T silica, 0.04T rare earth ore concentrate, 0.65T coke, 0.52T steel cuttings, mix according to weight proportion, add in the hot stove in ore deposit continuously, with voltage control at 80-90V, current control is at 24000-26000A, through the smelting of about 100min, to prepare to come out of the stove, tapping temperature is controlled at 1500～1600 ℃.
2, behind the about 20min of the hot stove energising in ore deposit, 85kg rare earth ferrosilicon alloy, 59kg silicocalcium, 86kg ferro-silicon are mixed the adding medium-frequency induction furnace, power transfers to 180KW and carries out melting.In the melting process, furnace charge constantly be depressed, to accelerate burn-off rate.When 70min, furnace charge all melts approximately, when the alloy melt temperature reaches 1500-1700 ℃ in the stove, prepares to come out of the stove.
When adopting medium-frequency induction furnace fusing rare earth silicon-calcium alloy, according to the capacity of medium-frequency induction furnace, add rare earth alloy and silicocalcium in proportion after, surplus can be replenished ferro-silicon, silicone content is controlled at 47～50% in the rare earth silicon-calcium alloy.
3, the alloy liquation in the hot stove in ore deposit is put into pressure magnesium bag, skimmed, the back temperature of skimming is controlled at 1450-1550 ℃, and alloy liquation weight is about 1.0T; To press the magnesium bag to hang in and press in the magnesium hole; at this moment adopt feeding wire machine that the cored-wire head that alloy special for precision casting tankage and Si-Ba alloy are housed is respectively sent into to press in the magnesium bag and begin line feeding; wire-feeding velocity is controlled at 0.5m/s; feed quantity alloy special for precision casting tankage 35kg; Si-Ba alloy 100kg; simultaneously the about 230kg of alloy liquation in the medium-frequency induction furnace is put into and press the magnesium bag; inflated with nitrogen stirs 1min; liquation is mixed; metal magnesium ingot with 135kg is pressed in the bag then; MAGNESIUM METAL is reacted under nitrogen protection with the interior alloy of bag; temperature of reaction is controlled at 1250-1450 ℃; after pressing the magnesium operation to finish, rustless dry broken bloom is added in the pressure magnesium bag according to 2% of total weight alloy, after continuing to inflate 100-150s; with alloy liquation injection molding; cooling; broken; screening promptly gets alloy special for precision casting.
Through check, every technical indicator all meets the quality product technical requirements.
Claims (1)
1, a kind of production technique of alloy special for precision casting, it is characterized in that material silex, rare earth ore concentrate, coke, steel cuttings according to weight proportion 0.8-1.5: 0.01-0.4: 0.4-0.8: 0.4-0.8 mixes, add in the hot stove in ore deposit continuously, by self baking electrode electric current is imported melting batch and smelt, tapping temperature is controlled at 1500～1600 ℃; Rare earth ferrosilicon alloy, silicocalcium and ferro-silicon are mixed the back according to weight proportion 70-180: 45-150: 0-115 melt in medium-frequency induction furnace, tapping temperature is controlled at 1500～1700 ℃; Earlier the alloy liquation in the hot stove in ore deposit is added and press the magnesium bag, to the alloy special for precision casting tankage be housed respectively again and press at the uniform velocity line feeding in the magnesium bag or/and the cored-wire head of raw silicon barium alloy is sent into, wire-feeding velocity is controlled at 0.2～1m/s, and feed quantity is the 10-20% of the hot stove liquation in ore deposit; Rare earth silicon-calcium alloy with the medium-frequency induction furnace fusing in line feeding adds pressure magnesium bag according to 10～30% of ore deposit hot stove liquid alloy weight, at last according to pressing magnesium technology to be pressed into magnesium ingot, alloy per ton adds MAGNESIUM METAL 100～140kg, alloy in MAGNESIUM METAL and the bag reacts under nitrogen protection, temperature of reaction is controlled at 1250～1450 ℃, and the time is controlled at 150～200s; After pressing the magnesium operation to finish, the 1-5% according to total weight alloy adds in the pressure magnesium bag with rustless dry broken bloom, after continuing to inflate 100-150s, with alloy liquation injection molding, cooling, fragmentation, screening, promptly gets alloy special for precision casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100127200A CN1323185C (en) | 2005-08-04 | 2005-08-04 | Alloy special for precision casting and its production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100127200A CN1323185C (en) | 2005-08-04 | 2005-08-04 | Alloy special for precision casting and its production technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1718823A CN1718823A (en) | 2006-01-11 |
| CN1323185C true CN1323185C (en) | 2007-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100127200A Expired - Fee Related CN1323185C (en) | 2005-08-04 | 2005-08-04 | Alloy special for precision casting and its production technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1323185C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1021060C (en) * | 1991-12-23 | 1993-06-02 | 无锡市江南合金研究所 | Nodularizing additive for casting high strength nodular graphite cast iron |
| RU2124566C1 (en) * | 1997-12-10 | 1999-01-10 | Открытое акционерное общество "КАМАЗ" | Briquetted mixture for inoculation of gray iron |
-
2005
- 2005-08-04 CN CNB2005100127200A patent/CN1323185C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1021060C (en) * | 1991-12-23 | 1993-06-02 | 无锡市江南合金研究所 | Nodularizing additive for casting high strength nodular graphite cast iron |
| RU2124566C1 (en) * | 1997-12-10 | 1999-01-10 | Открытое акционерное общество "КАМАЗ" | Briquetted mixture for inoculation of gray iron |
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| Publication number | Publication date |
|---|---|
| CN1718823A (en) | 2006-01-11 |
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