CN111482556A - Casting method of engine cylinder block casting - Google Patents
Casting method of engine cylinder block casting Download PDFInfo
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- CN111482556A CN111482556A CN202010436165.9A CN202010436165A CN111482556A CN 111482556 A CN111482556 A CN 111482556A CN 202010436165 A CN202010436165 A CN 202010436165A CN 111482556 A CN111482556 A CN 111482556A
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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
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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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
- C22C37/06—Cast-iron alloys containing chromium
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Crystallography & Structural Chemistry (AREA)
- 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 an engine cylinder block casting, which comprises the steps of preparing a sand mold by using molding sand and coating a coating; preparing a casting iron liquid, and feeding pig iron and a returned material serving as raw materials into a smelting furnace to be smelted into the iron liquid; adding a compound inoculant into the molten iron and stirring; pouring molten iron into the sand mold, feeding by adopting a 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 high product qualification rate.
Description
Technical Field
The invention relates to the technical field of casting production of automobile parts and engineering machinery, in particular to a casting method of an engine cylinder block casting.
Background
With the popularization of household automobiles, the demand of China on automobiles is increasing. With the rapid development of social economy and the continuous improvement of the living standard of people, the localization process of automobiles in China will be accelerated continuously, the consumption demand of automobiles remains vigorous, and the keeping quantity of automobiles will continue to show a rapid growth trend.
For automotive engines, the engine block is the most critical and important component of the engine. At present, engine cylinder bodies are mainly produced by casting, the most widely applied casting method is a wet clay sand manufacturing process, and the wet clay sand manufacturing process has the advantages of good forming performance, low energy consumption, low noise, less pollution, high efficiency, reliable operation and the like.
In the casting production of the engine cylinder, each link of the casting process can directly influence the yield of the cylinder casting production and the product quality of the cylinder casting, for example, the process design, the use of paint, the pouring temperature and the positioning of sand cores can all have important influence on the quality of the cylinder casting product, the factors are main reasons which cause the product yield of some engine cylinder production enterprises in China to be about 80% often, the yield of the engine cylinder casting product is low, the quality problem is more, and the main reasons are that the casting is shrunk and loosened, the sand is adhered, the core adhering bone, the microcrack and the surface accuracy is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the casting method of the engine cylinder block casting is provided, and the prepared casting is good in quality and high in product qualification rate.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the casting method of the engine block casting comprises the following steps:
a. preparing a sand mold by using molding sand, and coating;
b. preparing a casting iron liquid, and feeding pig iron and a returned material serving as raw materials into a smelting furnace to be smelted into the iron liquid;
c. adding a compound inoculant into the molten iron and stirring;
d. pouring molten iron into the sand mold, feeding by adopting a 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 chemical components of the molten iron comprise: 3.27 to 3.30 wt% of C, 1.85 to 1.95 wt% of Si, 0.65 to 0.75 wt% of Mn, 0.08 to 0.10 wt% of S, less than or equal to 0.06 wt% of P, 0.22 to 0.28 wt% of Cr, 0.7 to 0.8 wt% of Cu, 0.27 to 0.35 wt% of Mo, less than or equal to 0.018 wt% of Ti, and less than or equal to 0.002 wt% of Pb; the balance being iron.
Further, the method comprises the following steps: in the step a, 5 percent of chromite sand by weight is added into the molding sand.
Further, the method comprises the following steps: in the step a, the coating consists of a layer of bauxite-containing composite coating and two layers of graphite powder; the coating is added with fibrilia accounting for 0.2-0.5% of the total weight of the coating.
Further, the method comprises the following steps: in the step a, the sand mold comprises a casting cavity, a pouring system and a riser system; the pouring system comprises an air outlet, a sprue, a cross gate and a plurality of ingates, wherein the cross gate is flush with the bottom of the casting cavity, the ingates are arranged on the side surface of the bottom of the casting cavity and are communicated with the cross gate, the sprue is communicated with the cross gate, and two ends of the cross gate are provided with slag collecting bags; the riser system comprises an open-top riser arranged at the top of the casting cavity and a riser arranged on the side surface of the casting cavity and close to the top of the casting cavity.
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 part，ΣStraight bar:ΣHorizontal bar:ΣInner part＝1～2:1～1.5:1。
Further, the method comprises the following steps: in the step c, the compound inoculant consists of a lanthanum-containing inoculant and a 75-silicon iron inoculant; the inoculation time is more than 75% of the tapping time.
Further, the method comprises the following steps: according to the weight percentage, the total amount of the compound inoculant added is 0.4 +/-0.10 percent of the iron liquid; the addition amount of the lanthanum-containing inoculant is 0.25 +/-0.06%, and the granularity is 2-7 mm; the addition amount of the 75-ferrosilicon inoculant is 0.15 +/-0.04%, and the granularity is 2-7 mm.
Further, the method comprises the following steps: in the step d, the pouring temperature of the molten iron is 1360 +/-10 ℃.
Further, the method comprises the following steps: in the step e, the temperature of the furnace is controlled below 150 ℃ during heat treatment, the heating speed is less than or equal to 35 ℃/h, heat preservation is carried out after the temperature reaches 510-530 ℃, and the heat preservation time is 4 h; cooling to 200 ℃ along with the furnace after heat preservation is finished, and discharging from the furnace, wherein the cooling speed is less than or equal to 35 ℃/h.
The invention has the beneficial effects that:
1. the invention optimizes the structure of the sand mould, adopts the chill-free casting process, reduces the molding procedure links of the sand mould, and reduces the molding difficulty and the production cost of the casting;
2. according to the invention, the pouring process is optimized, and cooling pouring is adopted, so that the problem of increase of the shrinkage rate of the casting caused by overhigh temperature in the pouring process is reduced, the casting product cannot generate casting defects such as shrinkage cavity, shrinkage porosity and the like, and the energy consumption and the smelting cost are reduced;
3. the problem of poor air permeability of the engine cylinder body casting is solved by coating the composite coating on the molding sand, the graphite in the composite coating is utilized to carry out feeding on the casting and adjust the pressure of each height of molten iron, so that the pressure of the molten iron on each part of a cavity is homogenized, the good ductility of the graphite enables the flow of the molten iron to be smoother in the casting process, the air hole defect is not easily generated in the casting, and the casting has good compactness;
4. according to the invention, the heat resistance of the molding sand is improved by adding the chromite sand into the molding sand, and the problems of sand adhesion, core adhesion and the like caused by insufficient heat resistance of the molding sand are solved by utilizing the larger heat storage coefficient of the chromite sand.
Drawings
FIG. 1 is a schematic front view 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 schematic diagram of an end face water channel of a sand mold in accordance with the present invention;
FIG. 4 is a process diagram of heat treatment in the present invention;
labeled as: 100-cylinder body, 200-casting cavity, 310-sprue, 320-cross runner, 330-ingate and 340-slag trap.
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 engine cylinder block casting comprises the following steps:
the method comprises the following steps of firstly, preparing a sand mold by using molding sand, adding 5% of chromite sand by weight into the molding sand, and changing the heat resistance of the molding sand by using a large heat storage coefficient of the chromite sand, so that the problems of sand sticking, core sticking and the like caused by insufficient heat resistance are avoided; in the preparation process of the sand mold, the positioning of the core is the most important link in the whole molding process, the positioning accuracy of the core is directly related to the size accuracy of the inner cavity of the casting, if the positioning of the core is deviated, the size accuracy of the casting cannot meet the use requirement, and finally the product is scrapped.
In addition, the structure of the core bar is improved in the process of preparing the sand mold, the switching structure of the core bar is optimized into large fillet switching according to the thermal expansion direction of the core bar, so that the expansion direction of the mold core in the casting process is consistent with the thermal expansion direction, and the acting force on the mold core when the core bar is thermally expanded is greatly reduced.
After the sand mold is made, coating, wherein the coating adopted in the invention consists of a layer of bauxite-containing composite coating and two layers of graphite powder, and concretely can adopt Fuji 800 and Keshen TS141 composite yeast casting coatings; the graphite in the coating has good ductility, and can be used for feeding cylinder body castings and adjusting the pressure of molten iron at various heights during pouring, so that the molten iron pressure on each part of the cavity is uniform; in addition, in order to enhance the air permeability, the fibrilia accounting for 0.2-0.5% of the total weight of the coating is added into the coating, and after the fibrilia is combined with the graphite with good ductility, the air permeability of the coating is further improved, so that the flow of molten iron in the pouring process is smoother, the defect of air holes is not easily generated in a casting, and the compactness of the obtained casting product is better.
The sand mold structure manufactured by the invention is shown in fig. 1 to 3, the sand mold comprises a casting cavity 200, a pouring system and a riser system, and the cylinder body 100 is molded in the casting cavity 200; the pouring system comprises an air outlet, a sprue 310, a cross gate 320 and a plurality of ingates 330, wherein the cross gate 320 is flush with the bottom of the casting cavity 200, the ingates 330 are arranged on the side surface of the bottom of the casting cavity 200 and are communicated with the cross gate 320, the sprue 310 is communicated with the cross gate 320, and two ends of the cross gate 320 are provided with slag collecting bags 340; the riser system comprises open-top risers arranged at the thick part at the top of the casting cavity 200 and risers arranged at the side of the casting cavity 200 and close to the top of the casting cavity 200. The invention adopts a bottom pouring type pouring system, and a plurality of ingates 330 are utilized to supply molten iron to the bottom of the engine cylinder casting to realize pouring. During the pouring, the molten iron flows into the runner 320 after entering from the sprue 310, and the molten iron disperses along the strip-shaped runner 320 to enter the plurality of ingates 330, and the molten iron fills the casting cavity 200 gradually from bottom to top and discharges air therein, and along with the rising of the molten iron in the casting cavity 200, the molten iron flowing out of the ingates 330 on both sides increases gradually, so that the flow of the molten iron is increased, the pouring is completed quickly, the air can be ensured to be discharged completely, and the pouring time of the molten iron can be ensured to be enough.
Considering that molten iron flushes the cavity during pouring, the sectional areas of the sprue 310, the cross runner 320 and the ingate 330 are limited in the present invention, and the sectional area of the sprue is set to ΣStraight barCross section area of the horizontal runner is ∑Horizontal barThe cross section area of the ingate is sigmaInner partGuarantee sigmaStraight bar:ΣHorizontal bar:ΣInner partThe ratio of the molten iron to the molten iron is 1-2: 1-1.5: 15, so that the molten iron can be kept in a non-pressure flowing state when the pouring system is filled with the molten iron, the flushing force on a cavity is small, the slag blocking capability is good, the stability of mold filling can be ensured, and the mold filling time is reasonable. In addition, in order to obtain a good exhaust effect and a compensation shrinkage, prevent defects such as blowholes, and the like, and ensure that the total cross-sectional area of the gas outlets is equal to or greater than the sum of the cross-sectional areas of the plurality of ingates 330.
Step two, preparing a casting iron liquid, and feeding pig iron and a return charge as raw materials into a smelting furnace to be smelted into the iron liquid; the chemical components of the molten iron comprise: 3.27 to 3.30 wt% of C, 1.85 to 1.95 wt% of Si, 0.65 to 0.75 wt% of Mn, 0.08 to 0.10 wt% of S, less than or equal to 0.06 wt% of P, 0.22 to 0.28 wt% of Cr, 0.7 to 0.8 wt% of Cu, 0.27 to 0.35 wt% of Mo, less than or equal to 0.018 wt% of Ti, less than or equal to 0.002 wt% of Pb and the balance of Fe.
Adding a compound inoculant into the molten iron and fully stirring; the compound inoculant consists of a lanthanum-containing inoculant and a 75-silicon iron inoculant, so that the inoculation effect can be effectively enhanced; according to the weight percentage, the total amount of the compound inoculant added is 0.4 +/-0.10 percent of the iron liquid; the addition amount of the lanthanum-containing inoculant is 0.25 +/-0.06%, and the granularity is 2-7 mm; the addition amount of the 75-ferrosilicon inoculant is 0.15 +/-0.04%, and the granularity is 2-7 mm; ensure that the inoculation time is more than 75% of the tapping time.
Pouring molten iron into the sand mold, and forming a casting after the molten iron is subjected to mold filling and solidification under feeding of liquid metal of a riser; the pouring temperature is 1360 +/-10 ℃, and the time of the whole process from inoculation to pouring is less than or equal to 10 min; the pouring temperature in the process is lower than that of the traditional process, the problem of increase of the shrinkage rate of the casting caused by overhigh temperature in the pouring process is solved through low-temperature pouring, the casting product cannot generate casting defects such as shrinkage cavity, shrinkage porosity and the like, and the energy consumption and the smelting cost are reduced.
Step five, carrying out heat treatment on the formed cylinder body casting; the specific process of the heat treatment is shown in figure 4, the charging temperature is controlled below 150 ℃, the heating speed is less than or equal to 35 ℃/h, the heat preservation is carried out after the temperature reaches 510-530 ℃, and the heat preservation time is 4 h; cooling to 200 ℃ along with the furnace after heat preservation is finished, and discharging from the furnace, wherein the cooling speed is less than or equal to 35 ℃/h.
Example 1
Adopting HT300 gray cast iron, and smelting to obtain molten iron, wherein the molten iron comprises the following chemical components in percentage by weight: 3.26% of C, 1.9% of Si, 0.5% of Mn, 0.06% of P, 0.10% of S, 0.71% of Cu, 0.25% of Cr, 0.26% of Mo and the balance of Fe, preparing an engine cylinder casting according to the steps of the invention, 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 type Brinell hardness machine, and testing the mechanical properties Rm 323MPa and HBS 201; the metallographic structure data of the casting is as follows: the content of a type flake graphite was 90%, the content of B type flake graphite was 3%, the total content of D type and F type flake graphite was 7%, the content of pearlite was 97%, and the content of ferrite was 3%.
Example 2
Adopting HT300 gray cast iron, and smelting to obtain molten iron, wherein the molten iron comprises the following chemical components in percentage by weight: 3.31 percent of C, 2.1 percent of Si, 0.6 percent of Mn, 0.05 percent of P, 0.09 percent of S, 0.75 percent of Cu, 0.26 percent of Cr, 0.29 percent of Mo and the balance of Fe, preparing an engine cylinder 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 mechanical properties Rm 331MPa and HBS 212; the metallographic structure data of the casting is as follows: the content of type A flake graphite was 91%, the content of type B flake graphite was 4%, the total content of type D and type F flake graphite was 5%, the content of pearlite was 97%, and the content of ferrite was 3%.
Example 3
Adopting HT300 gray cast iron, and smelting to obtain molten iron, wherein the molten iron comprises the following chemical components in percentage by weight: 3.37% of C, 2.2% of Si, 0.7% of Mn, 0.04% of P, 0.08% of S, 0.78% of Cu, 0.27% of Cr, 0.35% of Mo and the balance of Fe, preparing an engine cylinder casting according to the steps of the invention, 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 type Brinell hardness machine, and testing the mechanical properties Rm 340MPa and HBS 233; the metallographic structure data of the casting is as follows: the content of A type flake graphite was 92%, the content of B type flake graphite was 7%, the total content of D type and F type flake graphite was 1%, the content of pearlite was 98%, and the content of ferrite was 2%.
Comparing the standard parameters of the mechanical property and the structure index of the HT300 engine cylinder block casting, see table 1,
TABLE 3 Standard parameters of mechanical Properties and texture indices required for HT300 Material
Comparing the three embodiments of the invention with the data in table 1, it can be seen that the performance data of the engine block castings of the three embodiments of the invention completely meet the requirements, and the qualification rates of the castings of the three embodiments are 93.0%, 95.2% and 94.8%, respectively, and the qualification rate is over 93%, which is much higher than the qualification rate of the castings of 80% in the conventional process.
Claims (10)
1. The casting method of the engine cylinder block casting is characterized by comprising the following steps: the method comprises the following steps:
a. preparing a sand mold by using molding sand, and coating;
b. preparing a casting iron liquid, and feeding pig iron and a returned material serving as raw materials into a smelting furnace to be smelted into the iron liquid;
c. adding a compound inoculant into the molten iron and stirring;
d. pouring molten iron into the sand mold, feeding by adopting a riser process, and forming a casting after pouring;
e. and carrying out heat treatment on the formed casting.
2. A method of casting an engine block casting as defined in claim 1, wherein: the chemical components of the molten iron comprise: 3.27 to 3.30 wt% of C, 1.85 to 1.95 wt% of Si, 0.65 to 0.75 wt% of Mn, 0.08 to 0.10 wt% of S, less than or equal to 0.06 wt% of P, 0.22 to 0.28 wt% of Cr, 0.7 to 0.8 wt% of Cu, 0.27 to 0.35 wt% of Mo, less than or equal to 0.018 wt% of Ti, and less than or equal to 0.002 wt% of Pb; the balance being iron.
3. A method of casting an engine block casting as defined in claim 1, wherein: in the step a, 5 percent of chromite sand by weight is added into the molding sand.
4. A method of casting an engine block casting as defined in claim 1, wherein: in the step a, the coating consists of a layer of bauxite-containing composite coating and two layers of graphite powder; the coating is added with fibrilia accounting for 0.2-0.5% of the total weight of the coating.
5. A method of casting an engine block casting as defined in claim 1, wherein: in the step a, the sand mold comprises a casting cavity, a pouring system and a riser system; the pouring system comprises an air outlet, a sprue, a cross gate and a plurality of ingates, wherein the cross gate is flush with the bottom of the casting cavity, the ingates are arranged on the side surface of the bottom of the casting cavity and are communicated with the cross gate, the sprue is communicated with the cross gate, and two ends of the cross gate are provided with slag collecting bags; the riser system comprises an open-top riser arranged at the top of the casting cavity and a riser arranged on the side surface of the casting cavity and close to the top of the casting cavity.
6. The method of casting an engine block casting as defined in claim 5, 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 part，ΣStraight bar:ΣHorizontal bar:ΣInner part＝1～2:1～1.5:1。
7. A method of casting an engine block casting as defined in claim 1, wherein: in the step c, the compound inoculant consists of a lanthanum-containing inoculant and a 75-silicon iron inoculant; the inoculation time is more than 75% of the tapping time.
8. The method of casting an engine block casting as defined in claim 7, wherein: according to the weight percentage, the total amount of the compound inoculant added is 0.4 +/-0.10 percent of the iron liquid; the addition amount of the lanthanum-containing inoculant is 0.25 +/-0.06%, and the granularity is 2-7 mm; the addition amount of the 75-ferrosilicon inoculant is 0.15 +/-0.04%, and the granularity is 2-7 mm.
9. A method of casting an engine block casting as defined in claim 1, wherein: in the step d, the pouring temperature of the molten iron is 1360 +/-10 ℃.
10. A method of casting an engine block casting as defined in claim 1, wherein: in the step e, the temperature of the furnace is controlled below 150 ℃ during heat treatment, the heating speed is less than or equal to 35 ℃/h, heat preservation is carried out after the temperature reaches 510-530 ℃, and the heat preservation time is 4 h; cooling to 200 ℃ along with the furnace after heat preservation is finished, and discharging from the furnace, wherein the cooling speed is less than or equal to 35 ℃/h.
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| 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 |
| CN115106501A (en) * | 2022-06-06 | 2022-09-27 | 芜湖泓鹄材料技术有限公司 | Casting process of full-mold casting machine tool body |
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