CN111451444A - Casting method of high-horsepower engine box body casting - Google Patents
Casting method of high-horsepower engine box body casting Download PDFInfo
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- CN111451444A CN111451444A CN202010435559.2A CN202010435559A CN111451444A CN 111451444 A CN111451444 A CN 111451444A CN 202010435559 A CN202010435559 A CN 202010435559A CN 111451444 A CN111451444 A CN 111451444A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/007—Treatment of the fused masses in the supply runners
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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
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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
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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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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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a casting method of a high-horsepower engine box body casting, which comprises the steps of preparing molding sand, molding and core making to obtain a sand mold; preparing a casting iron liquid, and feeding pig iron, a return charge and scrap steel serving as raw materials into a smelting furnace for smelting; carrying out in-ladle inoculation and spheroidizing on the smelted molten iron, carrying out stream inoculation before tapping, and then tapping; pouring molten iron into the sand mold, performing stream inoculation, performing compensation and temperature control by adopting a cold iron riser process, and forming a casting after pouring; and carrying out heat treatment on the formed casting. The casting prepared by the method has good quality, and quality problems such as sandwich, loose shrinkage, cracks and the like are not easy to occur.
Description
Technical Field
The invention relates to the technical field of casting production of accessories such as heavy-duty automobiles, large buses, engineering machinery and the like, in particular to a casting method of a high-horsepower engine box body casting.
Background
The national 'major technical equipment and product catalog of national support development' clearly indicates that 'a high-power diesel engine and key corollary equipment thereof' is the direction of national key support and preferential development. At present, the high-power diesel engine is widely applied to various fields of modern industry, has very wide application and requirements in the modern industry of China, and is also important key equipment related to the national economic development of China.
In a high-power diesel engine and key corollary equipment thereof, a diesel engine box body is the largest main part and the most important and key part, has very wide application range and application field, and can be widely applied to the aspects of heavy-duty automobiles, large-scale buses, engineering machinery, mining machinery, petroleum machinery, track machinery, port machinery, electric locomotives, ship power and the like.
For an automobile engine, an engine case is an indispensable component therein. At present, a high-horsepower engine box is mainly produced by casting, and a casting method which is most widely applied is a wet clay sand manufacturing process. For casting of a multi-cavity high-horsepower engine box body, the inner cavity structure of the multi-cavity high-horsepower engine box body is complex and a large number of cores are required to be used, so that the problems of core positioning, sand inclusion, sandwich, core adhesion bone adhesion and the like in the casting process of the high-horsepower engine box body are obvious, and meanwhile, the problems of shrinkage, shrinkage porosity, air holes and the like also have serious influence on the quality of a casting, so that the casting is low in qualified rate and poor in performance, the difficulty in later-stage processing is increased, and the processing quality is difficult to effectively guarantee. In addition, the casting must be strongly polished by using an oxygen melting rod or an air shovel in the subsequent treatment process, so that the quality and the service performance of the casting are easily secondarily reduced, the consumption of manpower and material resources is increased, and the production cost is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the casting method of the high-horsepower engine box body casting is provided, the quality of the prepared casting is good, and the quality problems of sandwich, loose shrinkage, cracks and the like are not easy to occur.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a casting method of a high-horsepower engine box body casting comprises the following steps:
a. preparing molding sand, molding and core making to obtain a sand mold;
b. preparing a casting iron liquid, and feeding pig iron, a return charge and scrap steel serving as raw materials into a smelting furnace for smelting;
c. carrying out in-ladle inoculation and spheroidizing on the smelted molten iron, carrying out stream inoculation before tapping, and then tapping;
d. pouring molten iron into a sand mold, performing stream inoculation, performing compensation and temperature control by adopting a cold iron riser process, and forming a casting after pouring;
e. and carrying out heat treatment on the formed casting.
Further, the method comprises the following steps: the molten iron comprises the following chemical components in percentage by weight: 3.65-3.75 wt% of C, 2.25-2.45 wt% of Si, 0.25-0.30 wt% of Mn, less than 0.02 wt% of S, less than or equal to 0.045 wt% of P, 0.33-0.37 wt% of Cu, 0.03-0.05 wt% of Mg and less than or equal to 0.045 wt% of Ti; the balance being iron.
Further, the method comprises the following steps: in the step a, the sand mold comprises a casting cavity, a pouring system, an overflow system and a riser system; the pouring system is provided with a sprue, a cross gate, a filter screen and a plurality of ingates; the cross gate is flush with the bottom of the casting cavity, the plurality of inner gates are symmetrically arranged on the side face of the bottom of the casting cavity and communicated with the cross gate, the cross gate is communicated with the sprue, and the filter screen is arranged between the cross gate and the sprue; the overflow system comprises an overflow ingate, an overflow slag collecting bag and an overflow sheet which are arranged at the top of the sand mould; the riser system comprises an insulating riser arranged at the top of the sand mould; the top of sand mould still is equipped with a plurality of gas pieces, and the bottom of sand mould is equipped with a plurality of chills.
Further, the method comprises the following steps: cross-sectional area of sprue channel ∑Straight barCross section area of the horizontal runner is ∑Horizontal barThe cross-sectional area of the ingate is ∑Inner partThe sum of the cross-sectional areas of the filter screens is ∑For treating，ΣStraight bar:ΣHorizontal bar:ΣInner part:ΣFor treating＝1.8～1.9:1.2～1.4:1:7.5。
Further, the method comprises the following steps: in the step b, the raw materials are as follows by weight percent: 20-40% of pig iron, 40-60% of foundry returns and 20% of scrap steel.
Further, the method comprises the following steps: the inoculation adopts a compound inoculation method, and the spheroidization adopts a compound spheroidization method.
Further, the method comprises the following steps: compounding a 6RE nodulizer with the particle size of 5-25 mm and the weight of 0.8 wt% of the weight of molten iron and a QRMG6RE2 nodulizer with the weight of 0.4 wt% of the weight of the molten iron, filling the mixture into the bottommost layer of a dam-type spheroidizing bag, and tamping the mixture; covering 75 ferrosilicon with the granularity of 3-12 mm and the weight of 0.1 wt% of the weight of the molten iron on the second layer and tamping; completely covering a crushed steel sheet with the weight of 0.6-0.8 wt% of the weight of molten iron on the third layer and compacting; covering the gap with a deslagging agent.
Further, the method comprises the following steps: and c, flushing a silicon-barium inoculant with the granularity of 3-12 mm and the weight of 0.5 wt% of the weight of the molten iron into the molten iron bag at one time for tapping and stream inoculation.
Further, the method comprises the following steps: in the step d, a Bi inoculant with the granularity of 0.2-0.8 mm and the weight of 0.13 wt% of the weight of the molten iron is added along with the flow when the molten iron is poured; the casting temperature of the molten iron is 1350 +/-10 ℃.
Further, the method comprises the following steps: in the step e, the temperature of the furnace is controlled below 200 ℃ during heat treatment, the heating speed is less than or equal to 35 ℃/h, the temperature is kept after the temperature reaches 560-580 ℃, and the heat preservation time is 4-8 h; and cooling after the heat preservation is finished, wherein the cooling speed is less than or equal to 25 ℃/h, cooling to the tapping temperature of less than 200 ℃, and then air-cooling to the room temperature.
The invention has the beneficial effects that:
1. by controlling the components of the molten iron and fully utilizing the remarkable graphitization and expansion effects of spherical graphite in the molten iron, the self-feeding is realized in the casting forming process, the defects of shrinkage porosity, shrinkage cavity and the like are effectively reduced, and the quality and the yield of the casting are improved;
2. by adopting composite spheroidizing, different elements in different nodulizers are utilized to play different roles and effects on the spheroidizing process, the rare earth contained in the 6RE nodulizer is utilized to ensure the stability of the spheroidizing role, the Mg element contained in the QRMG6RE2 nodulizer is utilized to improve the spheroidizing role of graphite in molten iron, and the spheroidizing stability and the spheroidizing effect are greatly improved;
3. the compound inoculation treatment is adopted, and the sufficient inoculation of the molten iron is ensured through multiple times of uninterrupted inoculation, so that the growth of matrix crystal grains can be hindered, the quantity of graphite can be effectively increased, the graphite is refined, the spheroidization grade is improved, stable nucleation particles are formed, and good conditions are provided for spheroidization reaction;
4. the casting system of the molding sand adopts double-side bottom pouring type casting and overflow system composite casting, so that the good mold filling speed and mold filling pressure of molten iron are effectively ensured, the mold filling fullness degree of a casting is improved, the mold filling is stable in the casting process, and the scouring force on a cavity is reduced;
5. and a chill riser process is adopted, and the gas outlet sheet arranged at the top of the sand mould, the heat-insulating riser and the chill arranged at the bottom of the sand mould are utilized to perform good compensation and cooling temperature regulation and control on the whole box casting, so that smooth air inlet and exhaust of a pouring system are ensured.
Drawings
FIG. 1 is a schematic view of a casting cavity of a sand mold according to the present invention;
FIG. 2 is a schematic top view of a sand mold according to the present invention;
FIG. 3 is a bottom schematic view of a sand mold according to the present invention;
FIG. 4 is a process diagram of heat treatment in the present invention;
labeled as: 100-casting cavity, 210-sprue, 220-cross runner, 230-filter screen, 240-ingate, 310-overflow ingate, 320-overflow slag collecting ladle, 410-heat preservation riser, 510-gas outlet sheet and 520-chill.
Detailed Description
In order to facilitate understanding of the invention, the invention is further described below with reference to the accompanying drawings and examples.
The casting method of the high-horsepower engine box body casting comprises the following steps of:
preparing molding sand, wherein the flow rate of resin/the flow rate of sand is 0.75-1.15 wt% in the preparation process of the molding sand, and the flow rate of curing agent/the flow rate of resin is adjusted according to different seasons, wherein the flow rate of curing agent/the flow rate of resin is 35-50 wt% in winter and 25-40 wt% in summer; molding and core making are carried out after the molding sand is prepared, because the shape of a high-horsepower engine box body casting is complex, more cores are used in the molding process, the positioning of the cores is the most important link in the whole molding process, the accuracy of the positioning of the cores is directly related to the size precision of the inner cavity of the casting, if the positioning of the cores generates deviation, the size precision of the casting cannot meet the use requirement, and finally the product is scrapped; in order to ensure accurate positioning of a plurality of cores, an axis positioning rod is arranged at the main position of the cavity before core assembly, and discrete cores are sequentially positioned and assembled along the axis positioning rod, so that accurate positioning of the cores is ensured, and the dimensional accuracy of the inner cavity of a high-horsepower engine box body casting can be effectively improved.
The sand mold structure manufactured by the invention is shown in fig. 1 to 3, and the sand mold comprises a casting cavity 100, a pouring system, an overflow system and a riser system; the pouring system is provided with a sprue 210, a cross gate 220, a filter screen 230 and a plurality of ingates 240; the horizontal pouring gate 220 is flush with the bottom of the casting cavity 100, the plurality of ingates 240 are symmetrically arranged on the side surface of the bottom of the casting cavity 100 and are communicated with the horizontal pouring gate 220, the horizontal pouring gate 220 is communicated with the sprue 210, and the filter screen 230 is arranged between the horizontal pouring gate 220 and the sprue 210; the overflow system comprises an overflow ingate 310 arranged at the top of the sand mould, an overflow slag collecting bag 320 and an overflow sheet; the riser system comprises an insulation riser 410 arranged at the top of the sand mould, and the insulation riser 410 is arranged at a position with lower molten iron temperature; the top of sand mould still is equipped with a plurality of gas pieces 510, and the bottom of sand mould is equipped with a plurality of chills 520, and chills 520 includes retinue chill and qualitative chill, sets up each heating power node position in the pouring process of high horsepower engine box respectively. During the pouring, the molten iron gets into the sand mould from sprue 210, then in controlling the dispersion to runner 220 behind filter screen 230, in getting into each ingate 240 along banding runner 220, the molten iron from top to bottom progressively fills foundry goods chamber 100, discharges the air simultaneously, along with the high body height of molten iron in foundry goods chamber 100, the molten iron that flows out in the ingate 240 of both sides increases gradually to the flow of molten iron has been increased. The pouring is completed quickly, the mold filling pressure is stable and the air exhaust is smooth in the pouring process, and the casting quality is ensured.
Considering that molten iron flushes the cavity in the pouring process, the cross sections of the sprue 210, the cross runner 220, the filter screen 230 and the ingate 240 are limited in the invention, and the cross section of the sprue is set to be sigmaStraight barCross section area of the horizontal runner is ∑Horizontal barThe cross section area of the ingate is sigmaInner partThe sum of the cross sections of the filter screens is sigmaFor treatingGuarantee sigmaStraight bar:ΣHorizontal bar:ΣInner part:ΣFor treatingThe ratio of the molten iron to the molten iron is 1.8-1.9: 1.2-1.4: 1:7.5, so that the molten iron keeps a micro-pressure flowing state when being filled in a pouring system, the scouring force to a cavity is small, the slag blocking capability is good, the stable mold filling can be ensured, and the mold filling time is reasonable. In addition, in order to obtain a good exhaust effect and feeding effect, the total cross-sectional area of the exhaust holes in the exhaust sheet 510 is ensured to be equal to or greater than the sum of the cross-sectional areas of the plurality of ingates 240.
After the sand mold is prepared, the casting coating is coated on the sand mold, and the casting coating can dry the sand mold in the combustion process and reduce the water content of the sand, so that the casting defects caused by poor air permeability and high water content of the sand during casting of a large high-horsepower engine box body casting are overcome. The Fuji 800 casting coating adopted in the invention has good suspension stability, excellent thixotropy and leveling property, no brush mark after being coated, firm coating, low gas evolution, easy ignition, high combustion value, good sand adhesion resistance and smooth casting surface. The bastose accounting for 0.2-0.5% of the weight of the casting coating can be added into the casting coating, so that the air permeability is further improved.
Step two, preparing a casting iron liquid, and feeding pig iron, a foundry returns and scrap steel as raw materials into a smelting furnace for smelting; the raw materials are as follows by weight percent: 20-40% of pig iron, 40-60% of foundry returns and 20% of scrap steel; the molten iron obtained after smelting comprises the following chemical components in percentage by weight: 3.65-3.75 wt% of C, 2.25-2.45 wt% of Si, 0.25-0.30 wt% of Mn, less than 0.02 wt% of S, less than or equal to 0.045 wt% of P, 0.33-0.37 wt% of Cu, 0.03-0.05 wt% of Mg, less than or equal to 0.045 wt% of Ti, and the balance of Fe; the iron liquid with the components realizes self-feeding in the casting forming process by utilizing the remarkable graphitization expansion effect of the spherical graphite in the iron liquid, effectively reduces the defects of shrinkage porosity, shrinkage cavity and the like, and improves the quality and yield of the casting.
Compounding a 6RE nodulizer with the granularity of 5-25 mm and the weight of 0.8 wt% of the weight of the molten iron and a QRMG6RE2 nodulizer with the weight of 0.4 wt% of the weight of the molten iron, loading the mixture into the bottommost layer of a dam-type spheroidizing bag and tamping, covering 75 silicon iron with the granularity of 3-12 mm and the weight of 0.1 wt% of the weight of the molten iron on the second layer and tamping, completely covering a broken steel sheet with the weight of 0.6-0.8 wt% of the weight of the molten iron on the third layer and compacting, and covering a deslagging agent on gaps; by the composite spheroidizing method, the stability of the spheroidization effect is ensured by utilizing the rare earth contained in the 6RE nodulizer, and the spheroidization effect of the graphite in the molten iron is improved by utilizing the Mg element contained in the QRMG6RE2 nodulizer; and (3) inoculating the liquid iron in the ladle by using 75 ferrosilicon, and flushing a silicon-barium inoculant with the granularity of 3-12 mm and the weight of 0.5 wt% of the weight of the liquid iron into the liquid iron ladle once for tapping and stream inoculation.
Pouring molten iron into the sand mold, wherein the pouring temperature of the molten iron is 1350 +/-10 ℃; adding a Bi inoculant with the granularity of 0.2-0.8 mm and the weight of 0.13 wt% of the weight of the molten iron along with the flow when the molten iron is poured; in the pouring process, a chill riser process is adopted for compensation and temperature control, and the vent plate 510 arranged at the top of the sand mold, the heat-insulating riser 410 and the chill 520 arranged at the bottom of the sand mold are utilized for carrying out good compensation and cooling temperature regulation and control on the whole box casting, so that smooth air inlet and outlet of a pouring system are ensured; and (5) pouring to form a casting.
The composite inoculation treatment method adopted in the steps of the invention is in-ladle inoculation, tapping inoculation and pouring stream inoculation, and ensures full inoculation of molten iron through multiple times of uninterrupted inoculation; the Bi element contained in the Bi inoculant can not only hinder the growth of matrix grains, but also effectively increase the quantity of graphite and refine the graphite, thereby improving the spheroidization grade, forming stable nucleation particles and providing good conditions for spheroidization reaction; the silicon and barium elements in the inoculant have good recession resistance, and the addition of the silicon and barium elements is only half of that of a 75 silicon iron inoculant in the traditional inoculation method, so that the inoculation cost is reduced while the inoculation effect is ensured.
Step five, performing heat treatment on the formed casting, wherein the specific process of the heat treatment is shown in figure 4, the charging temperature is controlled below 200 ℃, the heating speed is less than or equal to 35 ℃/h, heat preservation is performed after the temperature reaches 560-580 ℃, and the heat preservation time is 4-8 h; and cooling after the heat preservation is finished, wherein the cooling speed is less than or equal to 25 ℃/h, cooling to the tapping temperature of less than 200 ℃, and then air-cooling to the room temperature.
Example 1
Adopting EN-GJS-500-7 nodular cast iron, and the chemical components of the molten iron obtained by smelting comprise the following components in percentage by weight: 3.66% of C, 2.27% of Si, 0.26% of Mn, 0.023% of P, 0.10% of S, 0.34% of Cu, 0.03% of Mg, 0.026% of Ti and the balance of Fe, preparing a high-horsepower engine box casting according to the steps of the invention, cooling, testing the tensile strength Rm of the casting by using an SHT4305 microcomputer controlled electro-hydraulic servo universal testing machine, testing the hardness HBS of the casting by using an HB-3000 type Brinell hardness machine, and testing Rm to be 535MPa and HBS to be 186.
Example 2
Adopting EN-GJS-500-7 nodular cast iron, and the chemical components of the molten iron obtained by smelting comprise the following components in percentage by weight: 3.70% of C, 2.30% of Si, 0.27% of Mn, 0.022% of P, 0.09% of S, 0.35% of Cu, 0.04% of Mg, 0.029% of Ti and the balance of Fe, preparing a high-horsepower engine box casting according to the steps, cooling, testing the tensile strength Rm of the casting by using an SHT4305 microcomputer control electro-hydraulic servo universal testing machine, testing the hardness HBS of the casting by using an HB-3000 Brinell hardness machine, and testing the Rm to be 543MPa and the HBS to be 203.
Example 3
Adopting EN-GJS-500-7 nodular cast iron, and the chemical components of the molten iron obtained by smelting comprise the following components in percentage by weight: 3.71 percent of C, 2.40 percent of Si, 0.28 percent of Mn, 0.020 percent of P, 0.08 percent of S, 0.36 percent of Cu, 0.03 percent of Mg, 0.035 percent of Ti and the balance of Fe, preparing a high-horsepower engine box body casting according to the steps of the invention, testing the tensile strength Rm of the casting by an SHT4305 microcomputer controlled electro-hydraulic servo universal testing machine after cooling, testing the hardness HBS of the casting by an HB-3000 Brinell hardness machine, and testing the Rm to be 551MPa and the HBS to be 213.
Compared with the mechanical performance standard parameters of a high-horsepower engine box casting, namely Rm is more than or equal to 500MPa, HBS is 170-230, the mechanical performance of the three embodiments of the invention completely meet the index requirements of the high-horsepower engine box, and the production qualification rate of the casting is up to 95%.
Claims (10)
1. A casting method of a high-horsepower engine box body casting is characterized by comprising the following steps of: the method comprises the following steps:
a. preparing molding sand, molding and core making to obtain a sand mold, and coating a casting coating on the sand mold;
b. preparing a casting iron liquid, and feeding pig iron, a return charge and scrap steel serving as raw materials into a smelting furnace for smelting;
c. carrying out in-ladle inoculation and spheroidizing on the smelted molten iron, carrying out stream inoculation before tapping, and then tapping;
d. pouring molten iron into a sand mold, performing stream inoculation, performing compensation and temperature control by adopting a cold iron riser process, and forming a casting after pouring;
e. and carrying out heat treatment on the formed casting.
2. The casting method of a high horsepower engine case casting according to claim 1, wherein: the chemical components of the molten iron comprise: 3.65-3.75 wt% of C, 2.25-2.45 wt% of Si, 0.25-0.30 wt% of Mn, less than 0.02 wt% of S, less than or equal to 0.045 wt% of P, 0.33-0.37 wt% of Cu, 0.03-0.05 wt% of Mg and less than or equal to 0.045 wt% of Ti; the balance being iron.
3. The casting method of a high horsepower engine case casting according to claim 1, wherein: in the step a, the sand mold comprises a casting cavity, a pouring system, an overflow system and a riser system; the pouring system is provided with a sprue, a cross gate, a filter screen and a plurality of ingates; the cross gate is flush with the bottom of the casting cavity, the plurality of inner gates are symmetrically arranged on the side face of the bottom of the casting cavity and communicated with the cross gate, the cross gate is communicated with the sprue, and the filter screen is arranged between the cross gate and the sprue; the overflow system comprises an overflow ingate, an overflow slag collecting bag and an overflow sheet which are arranged at the top of the sand mould; the riser system comprises an insulating riser arranged at the top of the sand mould; the top of sand mould still is equipped with a plurality of gas pieces, and the bottom of sand mould is equipped with a plurality of chills.
4. The casting method of a high horsepower engine case casting according to claim 3, wherein: cross-sectional area of sprue channel ∑Straight barCross section area of the horizontal runner is ∑Horizontal barThe cross-sectional area of the ingate is ∑Inner partThe sum of the cross-sectional areas of the filter screens is ∑For treating，ΣStraight bar:ΣHorizontal bar:ΣInner part:ΣFor treating＝1.8～1.9:1.2～1.4:1:7.5。
5. The casting method of a high horsepower engine case casting according to claim 1, wherein: in the step b, the raw materials are as follows by weight percent: 20-40% of pig iron, 40-60% of foundry returns and 20% of scrap steel.
6. The casting method of a high horsepower engine case casting according to claim 1, wherein: the inoculation adopts a compound inoculation method, and the spheroidization adopts a compound spheroidization method.
7. The casting method of a high horsepower engine case casting according to claim 6, wherein: compounding a 6RE nodulizer with the particle size of 5-25 mm and the weight of 0.8 wt% of the weight of molten iron and a QRMG6RE2 nodulizer with the weight of 0.4 wt% of the weight of the molten iron, filling the mixture into the bottommost layer of a dam-type spheroidizing bag, and tamping the mixture; covering 75 ferrosilicon with the granularity of 3-12 mm and the weight of 0.1 wt% of the weight of the molten iron on the second layer and tamping; completely covering a crushed steel sheet with the weight of 0.6-0.8 wt% of the weight of molten iron on the third layer and compacting; covering the gap with a deslagging agent.
8. The casting method of a high horsepower engine case casting according to claim 6, wherein: and c, flushing a silicon-barium inoculant with the granularity of 3-12 mm and the weight of 0.5 wt% of the weight of the molten iron into the molten iron bag at one time for tapping and stream inoculation.
9. The casting method of a high horsepower engine case casting according to claim 6, wherein: in the step d, a Bi inoculant with the granularity of 0.2-0.8 mm and the weight of 0.13 wt% of the weight of the molten iron is added along with the flow when the molten iron is poured; the casting temperature of the molten iron is 1350 +/-10 ℃.
10. The casting method of a high horsepower engine case casting according to claim 1, wherein: in the step e, the temperature of the furnace is controlled below 200 ℃ during heat treatment, the heating speed is less than or equal to 35 ℃/h, the temperature is kept after the temperature reaches 560-580 ℃, and the heat preservation time is 4-8 h; and cooling after the heat preservation is finished, wherein the cooling speed is less than or equal to 25 ℃/h, cooling to the tapping temperature of less than 200 ℃, and then air-cooling to the room temperature.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113020541A (en) * | 2021-03-09 | 2021-06-25 | 宜宾普什联动科技有限公司 | Casting method of high-strength medium heat-resistant alloy cast iron cylinder body |
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