CN117600435A - Crack elimination method for cast iron mold - Google Patents
Crack elimination method for cast iron mold Download PDFInfo
- Publication number
- CN117600435A CN117600435A CN202410067342.9A CN202410067342A CN117600435A CN 117600435 A CN117600435 A CN 117600435A CN 202410067342 A CN202410067342 A CN 202410067342A CN 117600435 A CN117600435 A CN 117600435A
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- CN
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- Prior art keywords
- iron mold
- iron
- casting
- mold
- solidification
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 14
- 230000008030 elimination Effects 0.000 title claims abstract description 11
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 147
- 229910052742 iron Inorganic materials 0.000 claims abstract description 72
- 238000005266 casting Methods 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000007711 solidification Methods 0.000 claims abstract description 21
- 230000008023 solidification Effects 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000002054 inoculum Substances 0.000 claims abstract description 7
- 238000007600 charging Methods 0.000 claims abstract description 4
- 238000005336 cracking Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/061—Materials which make up the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/068—Semi-permanent moulds
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the technical field of casting, and discloses a crack elimination method of a cast iron mold, which comprises the following steps: adjusting the molten iron composition of the casting iron mold; adjusting a pouring system inlet of the iron mold; adjusting the casting temperature; placing an inner chill and an auxiliary outer chill, and placing the inner chill and the auxiliary outer chill at a position where cracks are easy to generate on an iron mold, so that the solidification speed of the position is accelerated, solidification is firstly completed in the solidification process, and solidification shrinkage cracking caused by solidification of the position after solidification of other positions is prevented, thereby generating cracks; the YJ-1 inoculant is used for improving the mechanical property of the casting body, so that the tendency of crack generation is effectively reduced in the repeated use process of the iron mold; controlling the furnace charging, discharging and cooling. The invention mainly solves the casting crack defect of the iron mould for sand-lined casting of the iron mould with the length of 1500mm, the width of 1000mm and the thickness of 200mm, and prolongs the service life of the iron mould to 100000 times.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a crack elimination method for a cast iron mold.
Background
The iron mould is used as a tool which is inevitably used in the sand coating process of the iron mould, and the casting quality of the iron mould directly influences the quality of products produced by the iron mould. For iron molds with the casting length of 1500mm, the width of 1000mm and the thickness of 200mm, crack defects exist in the middle part of the iron mold, when the iron mold is used for 10000 times after being processed, iron mold cracks extend from the edge to the center, the iron mold is seriously deformed, the thickness of a sand coating layer is uneven, and the iron mold cannot be normally used.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a crack removing method of a cast iron mold to solve the problems pointed out in the background art described above.
In order to achieve the above object, the following technical scheme is adopted:
a method of crack elimination in a cast iron mold comprising the steps of:
s1, adjusting molten iron components of a casting iron mold
The molten iron component of the casting iron mold comprises the following elements in percentage by mass: c:3.40% -3.50%, si:1.95% -2.05%, mn:0.45% -0.55%, P: less than or equal to 0.03 percent, S:0.015% -0.025%, cr:0.2% -0.3%, ti: less than or equal to 0.03 percent, and the balance being Fe;
s2, adjusting a pouring system inlet of the iron mold
The iron mold pouring system is arranged in the middle of the width direction of the iron mold, and the inlet of the iron mold pouring system is arranged in a structure dispersed from the middle to two sides;
s3, adjusting the pouring temperature
The casting temperature is controlled to be 1340-1380 ℃;
s4, placing the inner chiller and the auxiliary outer chiller
Placing an inner chill and an auxiliary outer chill at a position of the iron mold, which is easy to generate cracks, and accelerating the solidification speed of the position, so that solidification is finished in the solidification process, and the position is prevented from solidification, shrinkage and stretch cracking after solidification at other positions, thereby generating cracks;
s5, adding inoculant
The YJ-1 inoculant is used for improving the mechanical property of the casting body, so that the tendency of crack generation is effectively reduced in the repeated use process of the iron mold;
s6, controlling furnace charging, furnace discharging and cooling
Feeding the steel into a furnace when the furnace temperature is less than or equal to 200 ℃, heating to a speed of less than or equal to 100 ℃/h, preserving heat for one hour when the temperature is heated to 550-600 ℃, cooling to 200 ℃, discharging, cooling at a speed of less than or equal to 100 ℃/h, vibrating for 0.2-0.4 h in the cooling process, naturally cooling after stopping vibrating, increasing the strength of an iron mold, and fully releasing residual internal stress.
As a further improvement of the present invention, in step S3, the casting temperature is controlled to 1370 ℃.
As a further improvement of the present invention, in step S4, an inner chill is provided in the middle in the length direction of the iron mold, and the auxiliary outer chill is provided above the mold close to the gate over the mold close to the back flask to balance the cooling rate.
As a further improvement of the invention, the size of the internal chill is 200mm×200mm×40mm.
As a further improvement of the invention, in the step S6, the temperature difference of each part in the cooling process of the iron mold is controlled to be less than or equal to 30 ℃.
The beneficial effects of the invention are as follows: the invention mainly solves the casting crack defect of the iron mould for sand-lined casting of the iron mould with the length of 1500mm, the width of 1000mm and the thickness of 200mm, and prolongs the service life of the iron mould to 100000 times.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of the setting positions of the pouring system and the internal chiller according to the present invention, wherein a is the position of the pouring system and B is the setting position of the internal chiller.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
A method of crack elimination in a cast iron mold comprising the steps of:
s1, adjusting molten iron components of a casting iron mold
The molten iron component of the casting iron mold comprises the following elements in percentage by mass: c:3.40% -3.50%, si:1.95% -2.05%, mn:0.45% -0.55%, P: less than or equal to 0.03 percent, S:0.015% -0.025%, cr:0.2% -0.3%, ti: less than or equal to 0.03 percent, and the balance being Fe;
s2, adjusting a pouring system inlet of the iron mold
The iron mold pouring system is arranged in the middle of the width direction of the iron mold, and the inlet of the iron mold pouring system is arranged in a structure dispersed from the middle to two sides;
s3, adjusting the pouring temperature
The casting temperature is controlled to be 1340-1380 ℃;
s4, placing the inner chiller and the auxiliary outer chiller
Placing an inner chill and an auxiliary outer chill at a position of the iron mold, which is easy to generate cracks, and accelerating the solidification speed of the position, so that solidification is finished in the solidification process, and the position is prevented from solidification, shrinkage and stretch cracking after solidification at other positions, thereby generating cracks;
s5, adding inoculant
The YJ-1 high-efficiency long-acting instantaneous inoculant is used for improving the mechanical property of the casting body, and the tendency of crack generation is effectively reduced in the repeated use process of the iron mold;
s6, controlling furnace charging, furnace discharging and cooling
Feeding the steel into a furnace when the furnace temperature is less than or equal to 200 ℃, heating to a speed of less than or equal to 100 ℃/h, preserving heat for one hour when the temperature is heated to 550-600 ℃, cooling to 200 ℃, discharging, cooling at a speed of less than or equal to 100 ℃/h, vibrating for 0.2-0.4 h in the cooling process, naturally cooling after stopping vibrating, increasing the strength of an iron mold, and fully releasing residual internal stress.
In step S3, the casting temperature was controlled to 1370 ℃.
In step S4, an inner chill is provided in the middle of the length direction of the iron mold, and an auxiliary outer chill is provided above the mold close to the gate above the mold close to the back flask to balance the cooling rate.
The size of the internal cooling iron is 200mm multiplied by 40mm.
In the step S6, when the iron mold is cooled, the temperature difference of each part in the cooling process of the iron mold is controlled to be less than or equal to 30 ℃.
1. Position contrast is offered to the gating system:
the casting system is arranged at the middle position of the width of the iron mold, after casting is completed, casting is cast in a box for 120min, the temperature of the iron mold casting is 530+/-20 ℃ at two angles at the near end of the casting system, the temperature of the iron mold casting is 490+/-20 ℃ at two angles at the far end of the casting system, and the temperature of the lower chill part is 500+/-20 ℃.
When the opening position of the pouring system is at the edge position, pouring is finished, pouring is performed for 120min, casting is performed, the temperature of the iron mold casting is 600+/-20 ℃ and 520+/-20 ℃ respectively at two angles at the distance from the near end of the pouring system, the temperature of the iron mold casting is 490+/-20 ℃ and 470+/-20 ℃ respectively at two angles at the distance from the far end of the pouring system, and no chill is placed.
It can be seen from this that the temperature difference of the various parts of the cast iron mold is smaller when the pouring system is set in the middle position of the width of the cast iron mold.
2. Casting temperature-related experiment
The casting temperature-related experimental data are shown in table 1:
TABLE 1 casting temperature related experimental data
| Casting temperature | Results |
| 1400℃ | After molten iron is poured into the cavity, the supercooling degree is larger, the shrinkage of the molten iron is large, and shrinkage holes are easy to form at the hot junction of the iron box casting. |
| 1370℃ | Optimum casting temperature. |
| 1340℃ | The casting temperature is low, and cold insulation defects are easy to form. |
As can be seen from Table 1, the optimal casting temperature is 1370 ℃.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, component disassembly, or combination thereof, etc. that falls within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method for crack elimination in a cast iron mold, comprising the steps of:
s1, adjusting molten iron components of a casting iron mold
The molten iron component of the casting iron mold comprises the following elements in percentage by mass: c:3.40% -3.50%, si:1.95% -2.05%, mn:0.45% -0.55%, P: less than or equal to 0.03 percent, S:0.015% -0.025%, cr:0.2% -0.3%, ti: less than or equal to 0.03 percent, and the balance being Fe;
s2, adjusting a pouring system inlet of the iron mold
The iron mold pouring system is arranged in the middle of the width direction of the iron mold, and the inlet of the iron mold pouring system is arranged in a structure dispersed from the middle to two sides;
s3, adjusting the pouring temperature
The casting temperature is controlled to be 1340-1380 ℃;
s4, placing the inner chiller and the auxiliary outer chiller
Placing an inner chill and an auxiliary outer chill at a position of the iron mold, which is easy to generate cracks, and accelerating the solidification speed of the position, so that solidification is finished in the solidification process, and the position is prevented from solidification, shrinkage and stretch cracking after solidification at other positions, thereby generating cracks;
s5, adding inoculant
The YJ-1 inoculant is used for improving the mechanical property of the casting body, and the tendency of crack generation is reduced in the repeated use process of the iron mold;
s6, controlling furnace charging, furnace discharging and cooling
Feeding the steel into a furnace when the furnace temperature is less than or equal to 200 ℃, heating to a speed of less than or equal to 100 ℃/h, preserving heat for one hour when the temperature is heated to 550-600 ℃, cooling to 200 ℃, discharging, cooling at a speed of less than or equal to 100 ℃/h, vibrating for 0.2-0.4 h in the cooling process, naturally cooling after stopping vibrating, increasing the strength of an iron mold, and fully releasing residual internal stress.
2. A method of crack elimination in a cast iron mold as set forth in claim 1, wherein: in step S3, the casting temperature was controlled to 1370 ℃.
3. A method of crack elimination in a cast iron mold as set forth in claim 1, wherein: in step S4, an inner chill is provided in the middle of the length direction of the iron mold, and an auxiliary outer chill is provided above the mold close to the gate above the mold close to the back flask to balance the cooling rate.
4. A method of crack elimination in a cast iron mold as set forth in claim 3, wherein: the size of the internal cooling iron is 200mm multiplied by 40mm.
5. A method of crack elimination in a cast iron mold as set forth in claim 1, wherein: in the step S6, when the iron mold is cooled, the temperature difference of each part in the cooling process of the iron mold is controlled to be less than or equal to 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410067342.9A CN117600435A (en) | 2024-01-17 | 2024-01-17 | Crack elimination method for cast iron mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410067342.9A CN117600435A (en) | 2024-01-17 | 2024-01-17 | Crack elimination method for cast iron mold |
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| CN117600435A true CN117600435A (en) | 2024-02-27 |
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| CN202410067342.9A Pending CN117600435A (en) | 2024-01-17 | 2024-01-17 | Crack elimination method for cast iron mold |
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