CN114438274A - Production method of special high-silicon nodulizer for large castings - Google Patents
Production method of special high-silicon nodulizer for large castings Download PDFInfo
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- CN114438274A CN114438274A CN202210158655.6A CN202210158655A CN114438274A CN 114438274 A CN114438274 A CN 114438274A CN 202210158655 A CN202210158655 A CN 202210158655A CN 114438274 A CN114438274 A CN 114438274A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a production method of a special high-silicon nodulizer for large castings, which takes silica, coke, iron scale, rare earth silicon, calcium silicon and metal magnesium as raw materials and obtains the high-silicon nodulizer by smelting, weighing, hot blending, magnesium pressing and casting; the ferrosilicon alloy liquid produced by smelting has Si mass not less than 75% and temperature 1700-1800 ℃. The advantages are that: the silicon content of the ferrosilicon alloy liquid is kept to be more than 75 percent, the tapping temperature of the ferrosilicon is controlled to be more than 1700 ℃, the tapping temperature is higher than the melting point temperature of rare earth silicon and silicon calcium, the condition of the heat exchange process is met, and the phenomenon of magnetic permeability reduction caused by no waste steel is avoided; melting by depending on the temperature of molten iron, ensuring that the temperature is not reduced, and replacing a high-energy-consumption intermediate frequency (power frequency) furnace with a low-energy-consumption holding furnace; the gap between the outer wall of the balance weight pressing block and the inner wall of the furnace mouth of the heat preservation furnace is reduced, sealing is ensured by means of auxiliary equipment, and magnesium steam is sealed from the surface of molten iron to the furnace mouth to prevent the magnesium steam from leaking.
Description
The technical field is as follows:
the invention relates to the technical field of production of high-silicon nodulizers, in particular to a production method of a high-silicon nodulizer special for large castings.
Background art:
the nodular cast iron is widely applied as a high-strength cast iron material, and the main raw materials of the nodular cast iron comprise pig iron, scrap steel, return iron and nodulizer ferrosilicon alloy. The silicon content of the common nodular cast iron is about 1.0 percent and is mainly provided by special Q10 pig iron, however, when the wind power finished products are produced, the silicon content of the used large nodular cast iron needs to be about 2.0 percent, so when the large nodular cast iron is produced, the pig iron is often additionally added in the raw molten iron to ensure the final components of the castings.
However, after long-term production, the cost of increasing silicon by pig iron is too high, and the increase of the addition amount of pig iron also can increase the carbon content of molten iron, so that the mode of increasing the silicon content by using molten iron and adding a nodulizer in a furnace is generally used, but the recycled iron is a waste product in the production process, the yield of large castings in the industry is high, the yield is less than that of recycled iron, the supply is not in demand, and the silicon content of the nodulizer can only be increased to meet the demand.
The nodulizer commonly used in the industry at present is a ferrosilicon rare earth magnesium alloy, the silicon content is generally about 40-45%, the ferrosilicon rare earth magnesium alloy belongs to a medium-low silicon nodulizer, and meets the requirement of producing nodular cast iron with the silicon content of about 1.0%, the common production mode of the ferrosilicon rare earth magnesium alloy is a secondary remelting method, a duplex smelting pressure magnesium adding mode of an ore-smelting furnace and a medium-frequency (power frequency) electric furnace is adopted, the specific process is that firstly, raw materials such as silica and the like are used for producing ferrosilicon alloy liquid by the ore-smelting furnace, the silicon content of the molten iron is more than 75%, then, the ferrosilicon rare earth silicon, the ferrosilicon, calcium silicon, waste steel and other additives are added into the medium-frequency (power frequency) furnace, the components are adjusted, wherein the purpose of adding the waste steel is to improve the magnetic conductivity in the furnace, increase the melting speed, also can play a role of improving the content of other components and reducing the silicon content, during the period, the melting temperature is reduced due to the addition of a large amount of the waste steel, the medium-frequency (power frequency) furnace temperature needs to be adjusted, after the blending is stabilized, magnesium pressing treatment is carried out through special equipment, a magnesium ingot is pressed into molten iron, and finally a nodulizer is produced.
In order to meet the requirement of producing nodular cast iron with silicon content of about 2.0 percent, the silicon content of a nodulizer needs to be increased to more than 65 percent, and the production process of the original medium and low silicon nodulizer is improved to produce the nodulizer with high silicon content, and the technical problems to be solved are that:
1. the addition of scrap steel is reduced, more than 75 percent of silicon content of the original silicon-iron alloy liquid is reserved, but the magnetic permeability in a medium-frequency (power frequency) furnace is reduced, and the melting speed is reduced;
2. after the melting speed is reduced, the medium frequency (power frequency) heating melting can increase the energy consumption.
3. During magnesium pressing treatment, the magnesium pressing speed is high, splashing can be caused, the normal pressure magnesium introducing speed is relatively low, magnesium is easy to generate magnesium-containing steam to diffuse out due to the high melting point of magnesium and the low speed, effective magnesium smelting is reduced, the magnesium is in long-time air contact, the magnesium is high in amount of magnesium oxide generated by magnesium reaction, and therefore the effective magnesium smelting is reduced, and the content of magnesium in a nodulizer is influenced.
The invention content is as follows:
the invention aims to provide a method for preparing a special high-silicon nodulizer which is added in the production process of a large casting with silicon content of 2.0%.
The invention is implemented by the following technical scheme:
a production method of a special high-silicon nodulizer for large castings uses silica, coke, iron scale, rare earth silicon, calcium silicon and magnesium metal as raw materials, and the high-silicon nodulizer is obtained by smelting, weighing, heat-exchanging, magnesium-pressing and casting;
the ferrosilicon alloy liquid produced by smelting, wherein the mass of Si is more than or equal to 75 percent;
the mass of silicon in the high-silicon nodulizer is more than or equal to 68 percent.
Further, the method specifically comprises the following steps:
s1: preparing raw materials: including silica, coke, scale;
s2: smelting: smelting silica, coke and iron scale into ferrosilicon molten iron by an ore furnace.
S3: weighing: the method comprises the steps of placing molten iron by utilizing a ladle, lifting the ladle by a hook weigher to weigh, obtaining the weight of the ferrosilicon alloy liquid, and calculating the mass of the rare earth silicon, the silicon calcium and the magnesium metal according to the mass proportion of the molten iron, the rare earth silicon, the silicon calcium and the magnesium metal.
S4: heat exchange: and placing the rare earth silicon and the calcium silicate in a heat preservation furnace in advance, pouring molten iron into the heat preservation furnace, melting the rare earth silicon and the calcium silicate by utilizing the temperature of the molten iron, and waiting for 1-3 minutes.
S5: magnesium pressing: the magnesium metal is a strip-shaped magnesium ingot, the furnace mouth at the top of the self-insulation furnace of the magnesium ingot is pressed into molten iron through magnesium pressing special equipment, and the falling angle of the magnesium ingot is adjusted through auxiliary equipment at the top of the heat preservation furnace before entering the heat preservation furnace, so that the magnesium ingot smoothly passes through the furnace mouth of the heat preservation furnace.
S6: casting: and directly pouring the molten iron into a casting pool through the inclination of a heat preservation furnace to be cooled and fixed, thereby obtaining the finished product of the high-silicon nodulizer.
Further, the ferrosilicon alloy liquid in step S2 includes Si of 78 to 90% by mass, Ca of 1.0 to 2.0% by mass, Al of 0.5 to 1.0% by mass, and the balance of Fe.
Further, in the step S5, the magnesium pressing special device includes a bracket, a square hydraulic cylinder, a winch, a fixed pulley and a counterweight pressing block, the bottom of the body of the square hydraulic cylinder is horizontally fixed on the top of the bracket, the fixed pulley is respectively arranged on the telescopic rod of the square hydraulic cylinder and the top of the bracket, and the end of the steel wire rope of the winch bypasses the fixed pulley and fixes the counterweight pressing block; the diameter of the counterweight pressing block is smaller than the inner diameter of the furnace opening of the heat preservation furnace, and the clearance between the outer wall of the counterweight pressing block and the inner wall of the furnace opening of the heat preservation furnace is 10-30 mm.
Further, in the step S5, the auxiliary device includes an annular sleeve fixed to the top of the heat-preserving furnace mouth, the inner diameter of the annular sleeve is the same as the inner diameter of the heat-preserving furnace mouth, a sealing ring is fixed to the inner wall of the annular sleeve, support plates are uniformly distributed on the top of the annular sleeve along the circumference, the top ends of the support plates are arranged obliquely upward from the heat-preserving furnace mouth, and balls are embedded in the side walls of the support plates, which are close to the annular sleeve; the top of the heat preservation furnace on one side of the support plate is fixedly provided with an upright post, the top end of the upright post is fixedly provided with a horizontal hydraulic cylinder with a horizontal stroke, a slide rod horizontally penetrates through the upright post, one end of the slide rod is fixed with the end part of a piston rod of the horizontal hydraulic cylinder, and the other end of the slide rod is fixedly provided with a pressure applying hydraulic cylinder with a longitudinal stroke.
The invention has the advantages that: 1. the silicon content of over 75 percent of the ferrosilicon alloy liquid is reserved, so the addition of scrap steel is subtracted, the tapping temperature of the ferrosilicon is controlled to be about 1750 ℃ at the moment and is higher than the melting point temperature of rare earth silicon and silico-calcium, the condition of a heat exchange process is met, and the phenomenon of magnetic permeability reduction caused by the fact that no scrap steel is added is avoided;
2. when the heat exchange process is carried out, the raw materials in the heat preservation furnace are melted by the molten iron at high temperature, so that the melting temperature is ensured not to be reduced, and the high energy consumption temperature rise of the intermediate frequency (power frequency) furnace is not needed, therefore, the heat preservation furnace with low energy consumption for the intermediate frequency (power frequency) furnace with high energy consumption is replaced, and the problem of high energy consumption of the intermediate frequency (power frequency) furnace is solved;
3. the clearance of reducing counter weight briquetting outer wall and the fire door inner wall of heat preservation stove avoids counter weight briquetting outer wall and the fire door inner wall of heat preservation stove to collide with the help of auxiliary assembly, promotes and aims at efficiency, also ensures that the clearance is even, and is sealed through the sealing washer, and the steam that produces is airtight in molten iron surface to fire door department as far as possible after the molten iron of metal magnesium push down contact, prevents that magnesium vapour from spilling, has also reduced the volume of magnesium oxide.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the magnesium pressing dedicated device of the present invention;
FIG. 2 is an enlarged partial schematic view of the auxiliary device of FIG. 1 at point A;
FIG. 3 is a schematic diagram of the process of using the magnesium pressing special equipment and the auxiliary equipment in the invention.
In the figure: the magnesium pressing device comprises magnesium pressing special equipment 1, a support 2, a square hydraulic oil cylinder 3, a winch 4, a fixed pulley 5, a counterweight pressing block 6, auxiliary equipment 7, an annular sleeve 8, a support plate 9, a ball 10, a sealing ring 11, an upright post 12, a horizontal hydraulic cylinder 13, a sliding rod 14 and a pressing hydraulic cylinder 15.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
a production method of a special high-silicon nodulizer for large castings uses silica, coke, iron scale, rare earth silicon, calcium silicon and magnesium metal as raw materials, and the high-silicon nodulizer is obtained by smelting, weighing, heat-exchanging, magnesium-pressing and casting; the quality of Si in the ferrosilicon alloy liquid produced by smelting is more than or equal to 75 percent.
The method specifically comprises the following steps:
s1: preparing raw materials: comprises silica, coke and iron scale, and the proportion is 1: 1.0: 0.11, the practical production is exemplified: 1780Kg of silica, 1140Kg of coke and 200Kg of iron scale;
s2: smelting: smelting silica, coke and iron scale into ferrosilicon alloy liquid (commonly called molten iron) by using an ore furnace, wherein the ferrosilicon alloy liquid mainly comprises 78-90% of Si by mass, 1.0-2.0% of Ca by mass, 0.5-1.0% of Al by mass and the balance of Fe by mass, the temperature of the molten iron is about 1700-1800 ℃, and the temperature of the molten iron is preferably controlled to about 1750.
S3: weighing: the method comprises the steps of placing molten iron in a ladle, hoisting the ladle by using a crown block and a hook weigher, and weighing to obtain the weight of ferrosilicon alloy liquid, wherein the weight of the ferrosilicon alloy liquid is about 2500Kg, the mass ratio of the molten iron to rare earth silicon to calcium silicon to magnesium metal is 1:0.06:0.05:0.075, the required mass of the rare earth silicon to the calcium silicon to the magnesium metal is calculated according to the mass ratio, and the required mass of the rare earth silicon to the calcium silicon to the magnesium metal is about 165Kg, about 112Kg and about 187 Kg.
S4: heat exchange: presetting the calculated weight of the rare earth silicon and the silico-calcium in advance in a heat preservation furnace, wherein the melting point of the rare earth silicon is 1473-;
the silicon content of over 75 percent of the ferrosilicon alloy liquid is reserved, so the addition of scrap steel is subtracted, the tapping temperature of the ferrosilicon is controlled to be about 1750 ℃ at the moment and is higher than the melting point temperature of rare earth silicon and silico-calcium, the condition of a heat exchange process is met, and the phenomenon of magnetic permeability reduction caused by the fact that no scrap steel is added is avoided; secondly, when the hot-metal process is carried out, the molten iron is melted by the temperature of the molten iron, the temperature is ensured not to be reduced, and the high-energy consumption temperature rise of the intermediate frequency (power frequency) furnace is not needed, so that the intermediate frequency (power frequency) furnace with high energy consumption is replaced by the heat preservation furnace with low energy consumption, and the problem of high energy consumption of the intermediate frequency (power frequency) furnace is solved.
S5: magnesium pressing: magnesium metal is a long-strip-shaped magnesium ingot, a furnace mouth at the top of the magnesium ingot self-insulation furnace is pressed into molten iron through the magnesium pressing special equipment 1, and the falling angle of the magnesium ingot is adjusted through the auxiliary equipment 7 at the top of the heat preservation furnace before entering the heat preservation furnace, so that the magnesium ingot smoothly passes through the furnace mouth of the heat preservation furnace.
As shown in fig. 1, 2 and 3, the magnesium pressing special device 1 comprises a support 2, a square hydraulic cylinder 3, a winch 4, a fixed pulley 5 and a counterweight pressing block 6, wherein the bottom of a cylinder body of the square hydraulic cylinder 3 is horizontally fixed at the top of the support 2, a telescopic rod of the square hydraulic cylinder 3 and the top of the support 2 are respectively provided with the fixed pulley 5, and the end part of a steel wire rope of the winch 4 bypasses the fixed pulley 5 and is fixed with the counterweight pressing block 6;
when the magnesium pressing process is carried out, the bracket 2 is moved to one side of the heat preservation furnace mouth, then the magnesium ingot is fixed at the bottom of the counterweight pressing block 6, the telescopic rod of the square hydraulic oil cylinder 3 stretches to adjust the position of the magnesium ingot above the heat preservation furnace mouth, the winch 4 lowers the steel wire rope, and the counterweight pressing block 6 drives the magnesium ingot to fall to the heat preservation furnace mouth; the diameter of the counterweight pressing block 6 is smaller than the inner diameter of a furnace opening of the heat preservation furnace, the gap between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace opening of the heat preservation furnace is 10-30mm, the gap between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace opening of the heat preservation furnace is small, collision between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace opening of the heat preservation furnace needs to be avoided by means of an auxiliary device 7, alignment efficiency is improved, uniform gap is ensured, and more magnesium vapor is prevented from easily leaking out, the auxiliary device 7 comprises an annular sleeve 8 fixed at the top of the furnace opening of the heat preservation furnace, the inner diameter of the annular sleeve 8 is the same as the inner diameter of the furnace opening of the heat preservation furnace, a sealing ring 11 is fixed on the inner wall of the annular sleeve 8, support plates 9 are uniformly distributed on the top of the annular sleeve 8 along the circumference, the furnace opening of the heat preservation furnace at the top ends of the support plates 9 is arranged obliquely upwards, and balls 10 are embedded in the side walls of the annular sleeve 8 of the support plates 9; an upright post 12 is fixed at the top of the heat preservation furnace at one side of the support plate 2, a horizontal hydraulic cylinder 13 with horizontal stroke is fixed at the top end of the upright post 12, a slide rod 14 horizontally penetrates through the upright post 12, one end of the slide rod 14 is fixed with the end part of a piston rod of the horizontal hydraulic cylinder 13, and a pressure applying hydraulic cylinder 15 with longitudinal stroke is fixed at the other end of the slide rod 14.
The top parts of a plurality of support plates 9 are inclined upwards to form an open shape, a counterweight pressing block 6 is guided by the top parts of the support plates 9 and is easy to enter an annular sleeve 8 and a heat preservation furnace mouth, the fault tolerance rate is increased, the counterweight pressing block 6 slides down along rolling balls 10 to enter the heat preservation furnace, the balls 10 ensure that the gap between the outer wall of the counterweight pressing block 6 and the inner wall of the furnace mouth of the heat preservation furnace is uniform, steam generated after metal magnesium is pressed down to contact molten iron is applied to a sealing ring 11 as much as possible, a horizontal hydraulic cylinder 13 drives a pressing hydraulic cylinder 15 to horizontally slide to the upper part of the counterweight pressing block 6 through a sliding rod 14, the pressing hydraulic cylinder 15 presses the counterweight pressing block 6 downwards to enable the counterweight pressing block 6 to be in friction sealing with the sealing ring 11, the counterweight pressing metal magnesium into alloy liquid which is melted by rare earth silicon and calcium silicon by means of gravity and applied pressure of the counterweight pressing block 6, the sealing ring 11 can prevent magnesium steam from leaking, and the counterweight pressing block 6 continuously moves downwards into the heat preservation furnace, the magnesium metal reacts gradually, the magnesium vapor space is reduced gradually, most of the magnesium vapor is melted back into the molten iron, and the magnesium metal and the silicon in the molten iron form a silicon-magnesium phase.
S6: casting: and (3) directly pouring molten iron into the casting pool to be cooled and fixed by inclining the heat preservation furnace to obtain a finished high-silicon nodulizer, wherein the mass of silicon in the high-silicon nodulizer is more than or equal to 68%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A production method of a special high-silicon nodulizer for large castings is characterized in that silica, coke, iron scale, rare earth silicon, calcium silicon and metal magnesium are used as raw materials, and the high-silicon nodulizer is obtained by smelting, weighing, hot blending, magnesium pressing and casting;
the ferrosilicon alloy liquid produced by smelting, wherein the mass of Si is more than or equal to 75 percent;
the mass of silicon in the high-silicon nodulizer is more than or equal to 68 percent.
2. The production method of the special high-silicon nodulizer for the large castings according to claim 1, which is characterized by comprising the following steps:
s1: preparing raw materials: including silica, coke, scale;
s2: smelting: smelting silica, coke and iron scale into ferrosilicon molten iron by an ore furnace.
S3: weighing: and placing molten iron in a ladle, lifting the ladle by a hook balance for weighing to obtain the weight of the ferrosilicon alloy liquid, and calculating the mass required by the rare earth silicon, the silicon calcium and the metal magnesium according to the mass ratio of the molten iron, the rare earth silicon, the silicon calcium and the metal magnesium.
S4: heat exchange: and placing the rare earth silicon and the calcium silicate in a heat preservation furnace in advance, pouring molten iron into the heat preservation furnace, melting the rare earth silicon and the calcium silicate by utilizing the temperature of the molten iron, and waiting for 1-3 minutes.
S5: magnesium pressing: the magnesium metal is a strip-shaped magnesium ingot, the furnace mouth at the top of the self-insulation furnace of the magnesium ingot is pressed into molten iron through magnesium pressing special equipment, and the falling angle of the magnesium ingot is adjusted through auxiliary equipment at the top of the heat preservation furnace before entering the heat preservation furnace, so that the magnesium ingot smoothly passes through the furnace mouth of the heat preservation furnace.
S6: casting: and directly pouring molten iron into a casting pool through the inclination of a holding furnace, and standing the molten iron for cooling to obtain the finished high-silicon nodulizer.
3. The production method of the special high-silicon nodulizer for the large castings according to claim 2, characterized by comprising the following steps: the ferrosilicon alloy liquid in the step S2 mainly comprises Si with the mass of 78-90%, Ca with the mass of 1.0-2.0%, Al with the mass of 0.5-1.0%, and the balance of Fe.
4. The production method of the special high-silicon nodulizer for the large castings according to claim 3, characterized by comprising the following steps: the magnesium pressing special equipment in the step S5 comprises a support, a square hydraulic oil cylinder, a winch, a fixed pulley and a counterweight pressing block, wherein the bottom of a cylinder body of the square hydraulic oil cylinder is horizontally fixed at the top of the support, a telescopic rod of the square hydraulic oil cylinder and the top of the support are respectively provided with the fixed pulley, and the end part of a steel wire rope of the winch bypasses the fixed pulley and fixes the counterweight pressing block; the diameter of the counterweight pressing block is smaller than the inner diameter of the furnace mouth of the holding furnace, and the clearance between the outer wall of the counterweight pressing block and the inner wall of the furnace mouth of the holding furnace is 10-30 mm.
5. The production method of the special high-silicon nodulizer for the large castings according to claim 4, characterized by comprising the following steps: in the step S5, the auxiliary equipment comprises an annular sleeve fixed at the top of the heat preservation furnace mouth, the inner diameter of the annular sleeve is the same as that of the heat preservation furnace mouth, a sealing ring is fixed on the inner wall of the annular sleeve, support plates are uniformly distributed on the top of the annular sleeve along the circumference, the top ends of the support plates are obliquely arranged upwards from the heat preservation furnace mouth, and balls are embedded in the side walls of the support plates, which are close to the annular sleeve; the top of the heat preservation furnace on one side of the support plate is fixedly provided with an upright post, the top end of the upright post is fixedly provided with a horizontal hydraulic cylinder with a horizontal stroke, a slide rod horizontally penetrates through the upright post, one end of the slide rod is fixed with the end part of a piston rod of the horizontal hydraulic cylinder, and the other end of the slide rod is fixedly provided with a pressure applying hydraulic cylinder with a longitudinal stroke.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115094182A (en) * | 2022-06-07 | 2022-09-23 | 聊城新泺机械有限公司 | Smelting technology and application of nodular cast iron molten iron without shrinkage cavity and shrinkage porosity tendency |
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| CN115094182A (en) * | 2022-06-07 | 2022-09-23 | 聊城新泺机械有限公司 | Smelting technology and application of nodular cast iron molten iron without shrinkage cavity and shrinkage porosity tendency |
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