CN110565005A - Production process method of low-temperature ductile iron casting - Google Patents
Production process method of low-temperature ductile iron casting Download PDFInfo
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- CN110565005A CN110565005A CN201910841863.4A CN201910841863A CN110565005A CN 110565005 A CN110565005 A CN 110565005A CN 201910841863 A CN201910841863 A CN 201910841863A CN 110565005 A CN110565005 A CN 110565005A
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Classifications
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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
- 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
- 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
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- 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
-
- 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
Abstract
The invention relates to a production process method of a low-temperature ductile iron casting, which comprises the following steps of melting and proportioning, melting iron liquid, inoculating treatment, molding and pouring, cleaning and polishing, packaging and oiling, wherein in the processing process, primary shot blasting, polishing and primary heat treatment are carried out after the pouring is finished, then secondary heat treatment and secondary shot blasting are carried out through mechanical rough machining, paint is coated finally, and final inspection is carried out, the defects of the casting are few, the defects such as slag holes, shrinkage cavities and the like are few, the yield reaches 98.5 percent and is far higher than the industry average level 95 percent, the defects in the casting process are improved, the yield of the casting is improved, and the chemical components and the mass percentage content of each component of the obtained casting are finally ensured: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti% and 0.015-0.035% of Sb%.
Description
Technical Field
The invention relates to the technical field of production process methods of castings, in particular to a production process method of a low-temperature ductile iron casting.
Background
Casting is a relatively early metal hot working process mastered by human beings, and has a history of about 6000 years. China has entered the full prosperity of bronze castings approximately 1700 to the first 1000 years of the Gregorian, and has reached a fairly high level in technology. Casting refers to a processing mode of melting solid metal into liquid, pouring the liquid into a casting mold with a specific shape, and solidifying and forming the liquid. The cast metal comprises: copper, iron, aluminum, tin, lead and the like, and the materials of the common casting mold are raw sand, clay, water glass, resin and other auxiliary materials. The casting mould for special casting comprises: investment casting, lost foam casting, metal casting, ceramic casting, and the like. The casting is a technological process of smelting metal into liquid meeting certain requirements, pouring the liquid into a casting mold, cooling, solidifying and cleaning to obtain a casting with a preset shape, size and performance. Casting is one of the fundamental processes in the modern device manufacturing industry, because of the near shaping, the cast blank achieves the purpose of no machining or little machining, which reduces cost and manufacturing time to a certain extent.
The low-temperature ductile iron casting produced by the existing production process method often has more defects, is easy to generate phenomena such as slag holes and shrinkage cavities, and has low yield.
Disclosure of Invention
The invention provides a production process method of a low-temperature ductile iron casting. The quality problem when mainly using avoids the empty foundry goods in later stage to appear so the problem of solving improves the defect that appears in the casting process, improves the yield of foundry goods, has improved the production effect of enterprise greatly and has reduced the processing cost of enterprise.
The technical scheme provided by the invention is as follows: a production process method of a low-temperature ductile iron casting comprises the following steps:
1) Melt compounding ratio
The weight percentage of the materials to be processed is as follows: scrap steel: pig iron: 30% of returned materials: 30%: 40% + and a proper amount of alloy material.
2) Melting of molten iron
Putting the raw materials into a smelting furnace to complete the melting of the molten iron and the blending of chemical components, wherein the mass percentage content of the chemical components of the molten iron meets the following requirements when the molten iron is discharged from the furnace: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti%, 0.015-0.035% of Sb% and controlling the melting temperature of molten iron at 1530-1570 ℃.
3) Inoculation treatment
Inoculating the molten iron by the method of 'punching in the ladle'
4) moulding and casting
Adopting the cooperation of precoated sand and wet precoated sand to make cores through a core shooter and then mould assembling, controlling the pouring temperature during pouring: 1440-1370 ℃, and opening the box when the temperature of the casting is reduced to the room temperature, and strictly controlling the temperature and opening the box according to the requirements.
5) The chemical components and the mass percentage contents of the components of the obtained casting are as follows: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti% and 0.015-0.035% of Sb%.
6) Cleaning and polishing
And (3) clearing the sand on the surface of the casting, polishing redundant water gaps, performing shot blasting, and performing surface polishing and stress removal (aging treatment) on the workpiece.
7) Packaging and oiling
Packaging, oiling, performing rust prevention treatment, and taking out of the warehouse instead of processing.
Further, the low-temperature ductile iron casting comprises the following components in percentage by mass: scrap steel of leftover materials of stamping and the pig iron under international control production are selected as the automobile industry type, and alloy materials C percent is 3.3-3.45 percent, Si percent is 1.90-2.1 percent, Mn percent is 0.6-0.9 percent, Cr percent is 0.07-0.15 percent, Cu percent is 0.07-0.15 percent, Ti percent is less than or equal to 0.05 percent, and Sb percent is 0.015-0.035 percent.
Further, the melting temperature of molten iron is controlled to be 1530-1570 ℃ during molten iron melting, and the pouring temperature is controlled to be: 1440-1370 ℃.
Further, adopt tectorial membrane sand + tide membrane sand cooperation during the molding, tectorial membrane sand: the material with less gas evolution, high strength and high refractoriness, the wet sand film: the raw sand for raw sand production is prepared by adding clay, coal powder, water and the like into raw sand with the granularity of 70-120 meshes and grinding for more than 15 minutes.
Further, in the processing process, after the casting is finished, shot blasting, polishing and primary heat treatment are carried out, then mechanical rough processing is carried out, secondary heat treatment and secondary shot blasting are carried out, finally paint is coated, and finally the finished product is sent to final inspection.
Advantageous effects
The invention provides a production process method of a low-temperature ductile iron casting, which has the advantages of few defects of the casting, few defects of slag holes, shrinkage cavities and the like, yield of 98.5 percent which is far higher than the average level of the industry by 95 percent, greatly improved production effect of enterprises, reduced processing cost of the enterprises, ensured quality of the casting in later use, avoided faults of the casting in later period, and reduced cost of later maintenance and recovery.
Detailed Description
In order to further understand the characteristics, technical means, and the achieved objects and functions of the production process of the low-temperature ductile iron casting, the invention is further described in detail with reference to the specific embodiments.
The following description is given of specific preferred embodiments of a method for producing a low-temperature ductile iron casting according to the present invention, and it should be noted that the embodiments of the present invention are only some embodiments, and not all embodiments, and modifications and substitutions based on the present invention should be considered to be within the scope of the present invention.
The invention provides a production process method of a low-temperature ductile iron casting, which comprises the following steps:
1) Melt compounding ratio
The weight percentage of the materials to be processed is as follows: scrap steel: pig iron: 30% of returned materials: 30%: 40% + and a proper amount of alloy material.
2) Melting of molten iron
Putting the raw materials into a smelting furnace to complete the melting of the molten iron and the blending of chemical components, wherein the mass percentage content of the chemical components of the molten iron meets the following requirements when the molten iron is discharged from the furnace: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti%, 0.015-0.035% of Sb% and controlling the melting temperature of molten iron at 1530-1570 ℃.
3) Inoculation treatment
Inoculating the molten iron by the method of 'punching in the ladle'
4) Moulding and casting
Adopting and adopting tectorial membrane sand + damp membrane sand cooperation to model, the system core, pouring temperature control is in during the pouring: 1440-1370 ℃, and opening the box when the temperature of the casting is reduced to the room temperature.
5) The chemical components and the mass percentage contents of the components of the obtained casting are as follows: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti% and 0.015-0.035% of Sb%.
6) Cleaning and polishing
And (3) clearing the sand on the surface of the casting, polishing redundant water gaps, performing shot blasting, and performing surface polishing and stress removal (aging treatment) on the workpiece.
7) Packaging and oiling
Packaging, oiling, performing rust prevention treatment, and taking out of the warehouse instead of processing.
A production process method of a low-temperature ductile iron casting discloses that the low-temperature ductile iron casting comprises the following components in percentage by mass: selecting scrap steel of leftover materials of stamping and automobile industry types and pig iron under international control production, and alloy materials of 3.3-3.45 percent of C, 1.90-2.1 percent of Si, 0.6-0.9 percent of Mn, 0.07-0.15 percent of Cr, 0.07-0.15 percent of Cu, less than or equal to 0.05 percent of Ti and 0.015-0.035 percent of Sb, controlling the melting temperature of molten iron in the melting process of the molten iron at 1530-1570 ℃, and controlling the casting temperature in the casting process: 1440-1370 ℃, adopting the combination of precoated sand and wet precoated sand during modeling, wherein the precoated sand: the material with less gas evolution, high strength and high refractoriness, the wet sand film: the primary sand for the primary sand manufacturing is prepared by adding clay, coal powder, water and the like into primary sand with the granularity of 70-120 meshes, grinding for more than 15 minutes, performing primary shot blasting, polishing and primary heat treatment after casting, performing secondary heat treatment and secondary shot blasting through mechanical rough machining, finally coating paint, and sending to final inspection.
The invention provides a production process method of a low-temperature ductile iron casting, which has the advantages of few defects of the casting, few defects of slag holes, shrinkage cavities and the like, yield of 98.5 percent which is far higher than the average level of the industry by 95 percent, greatly improved production effect of enterprises, reduced processing cost of the enterprises, ensured quality of the casting in later use, avoided faults of the casting in later period, and reduced cost of later maintenance and recovery.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A production process method of a low-temperature ductile iron casting is characterized by comprising the following steps: the method comprises the following steps:
1) Melt compounding ratio
The weight percentage of the materials to be processed is as follows: scrap steel: pig iron: 30% of returned materials: 30%: 40% + and a proper amount of alloy material.
2) Melting of molten iron
Putting the raw materials into a smelting furnace to complete the melting of the molten iron and the blending of chemical components, wherein the mass percentage content of the chemical components of the molten iron meets the following requirements when the molten iron is discharged from the furnace: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti%, 0.015-0.035% of Sb% and controlling the melting temperature of molten iron at 1530-1570 ℃.
3) Inoculation treatment
Inoculating the molten iron, wherein the inoculation method adopts a ladle flushing method for inoculation.
4) Moulding and casting
Adopting and adopting tectorial membrane sand + damp membrane sand cooperation to model, the system core, pouring temperature control is in during the pouring: 1440-1370 ℃, and opening the box when the temperature of the casting is reduced to the room temperature.
5) The chemical components and the mass percentage contents of the components of the obtained casting are as follows: 3.3-3.45% of C%, 1.90-2.1% of Si%, 0.6-0.9% of Mn%, 0.07-0.15% of Cr%, 0.07-0.15% of Cu%, less than or equal to 0.05% of Ti% and 0.015-0.035% of Sb%.
6) cleaning and polishing
And (3) clearing the sand on the surface of the casting, polishing redundant water gaps, performing shot blasting, and performing surface polishing and stress removal (aging treatment) on the workpiece.
7) Packaging and oiling
Packaging, oiling, performing rust prevention treatment, and taking out of the warehouse instead of processing.
2. The production process method of a low-temperature ductile iron casting according to claim 1, characterized in that: the low-temperature ductile iron casting comprises the following components in percentage by mass: scrap steel of leftover materials of stamping and the pig iron under international control production are selected as the automobile industry type, and alloy materials C percent is 3.3-3.45 percent, Si percent is 1.90-2.1 percent, Mn percent is 0.6-0.9 percent, Cr percent is 0.07-0.15 percent, Cu percent is 0.07-0.15 percent, Ti percent is less than or equal to 0.05 percent, and Sb percent is 0.015-0.035 percent.
3. The production process method of the low-temperature ductile iron casting according to claim 1, wherein the melting temperature of molten iron is controlled to be 1530-1570 ℃ during the molten iron melting, and the pouring temperature is controlled to be: 1440-1370 ℃.
4. The production process method of the low-temperature ductile iron casting according to claim 1, wherein the molding is carried out by combining precoated sand and wet precoated sand, wherein the precoated sand: the material with less gas evolution, high strength and high refractoriness, the wet sand film: the raw sand for raw sand production is prepared by adding clay, coal powder, water and the like into raw sand with the granularity of 70-120 meshes and grinding for more than 15 minutes.
5. The production process method of the low-temperature ductile iron casting according to claim 1, wherein in the machining process, after the casting is finished, the shot blasting, the grinding, the first heat treatment, the rough machining, the second heat treatment, the secondary shot blasting, the paint coating and the final inspection are carried out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910841863.4A CN110565005A (en) | 2019-09-06 | 2019-09-06 | Production process method of low-temperature ductile iron casting |
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| CN201910841863.4A CN110565005A (en) | 2019-09-06 | 2019-09-06 | Production process method of low-temperature ductile iron casting |
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| CN110565005A true CN110565005A (en) | 2019-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114737108A (en) * | 2022-04-29 | 2022-07-12 | 德兴市立达机械制造有限公司 | Formula of gold bearing and casting process thereof |
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| CN105256220A (en) * | 2015-09-22 | 2016-01-20 | 山东汇丰铸造科技股份有限公司 | Low-temperature high-toughness nodular cast iron winding drum and preparation method thereof |
| CN106493310A (en) * | 2016-10-14 | 2017-03-15 | 安徽大天铸业有限责任公司 | Shell casting method is covered in a kind of tide mould sand high pressure moulding |
| CN108588545A (en) * | 2018-03-19 | 2018-09-28 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
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2019
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| JP5506973B1 (en) * | 2013-03-29 | 2014-05-28 | 日立造船株式会社 | Spheroidal graphite cast iron and method for producing the same |
| CN105256220A (en) * | 2015-09-22 | 2016-01-20 | 山东汇丰铸造科技股份有限公司 | Low-temperature high-toughness nodular cast iron winding drum and preparation method thereof |
| CN106493310A (en) * | 2016-10-14 | 2017-03-15 | 安徽大天铸业有限责任公司 | Shell casting method is covered in a kind of tide mould sand high pressure moulding |
| CN108588545A (en) * | 2018-03-19 | 2018-09-28 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
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Application publication date: 20191213 |