CN110499403A - Gray cast iron casting technique - Google Patents
Gray cast iron casting technique Download PDFInfo
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- CN110499403A CN110499403A CN201910925216.1A CN201910925216A CN110499403A CN 110499403 A CN110499403 A CN 110499403A CN 201910925216 A CN201910925216 A CN 201910925216A CN 110499403 A CN110499403 A CN 110499403A
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- iron
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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
- C21C1/08—Manufacture of cast-iron
-
- 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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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention provides a kind of gray cast iron casting technique, gray cast iron casting technique includes the following steps: to prepare furnace charge: taking the new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and the copper of predetermined dimension；First time melt；Second of melt；Prepare molten iron: continuous heating smelting furnace；Prepare ladle: taking ladle heating, drying, inovulant packet bottom is added in ladle；It breeds molten iron: quickly molten iron being cast to ladle, stirs molten iron, so that inovulant melts, casting molten iron to mold；Cast gray cast iron: ladle casts molten iron to the type chamber of mold.Gray cast iron casting technique of the invention, technical process is simple, and raw material sources are convenient, and the gray cast iron tensile strength of casting is excellent, and gray cast iron is unlikely to deform, and can reduce the production cost of enterprise.
Description
Technical field
The present invention relates to the technical fields of casting technique, more particularly to a kind of gray cast iron casting technique.
Background technique
Gray cast iron refers to the cast iron with flake graphite.In gray cast iron carbon in the form of flake graphite there are fracture gray,
There is good casting character, good damping, good wear-resisting property, good machinability, low lack
Mouth sensibility, mainly for the manufacture of rack, cabinet etc..Gray cast iron is to produce to form with casting technique.Currently, existing founder
Skill process is more, complex process, also, casts out the castings of gray cast iron tensile strength deficiency come, and gray iron casting is easily-deformable.
Summary of the invention
Based on this, the present invention provides a kind of new gray cast iron casting technique, with solve existing casting technique process compared with
It is more, the problem of complex process, cast out that the castings of gray cast iron tensile strength come is excellent, and gray iron casting demoulding is unlikely to deform.
A kind of gray cast iron casting technique, gray cast iron casting technique include the following steps:
Prepare furnace charge: taking the new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and the copper of predetermined dimension；
First time melt: the new pig iron and foundry returns is taken to be placed in smelting furnace, the new pig iron of smelting furnace melting and foundry returns；
Second of melt: melting completely to the new pig iron and foundry returns, and carbon steel scrap, manganese iron, molybdenum-iron, silicon sequentially is added toward smelting furnace
Iron and copper, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper；
Prepare molten iron: continuous heating smelting furnace, so that melting in-furnace temperature is kept between 1300 degrees Celsius to 1500 degrees Celsius, system
Obtain molten iron；
Prepare ladle: taking ladle heating, drying, inovulant packet bottom is added in ladle；
It breeds molten iron: quickly molten iron being cast to ladle, stirs molten iron, so that inovulant melts, casting molten iron to mold；
Casting gray cast iron: ladle casts molten iron to the type chamber of mold, and molten iron is made pre- according to the type chamber coagulation forming of mold
The gray cast iron of set pattern lattice.
The block of the new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper in one of the embodiments,
Degree be respectively the new pig iron less than 220 millimeters multiplied by 150 millimeters, foundry returns less than 150 millimeters multiplied by 150 millimeters, carbon steel scrap
Cross-sectional area is less than 100 square centimeters, 5 millimeters to 70 millimeters of manganese iron, 5 millimeters to 60 millimeters of molybdenum-iron, 5 millimeters of ferrosilicon to 15 millis
Rice, copper width and thickness be respectively smaller than 100 millimeters and 10 millimeters.
The smelting furnace is GW-0.25 type medium frequency response ratio in one of the embodiments,.
It is that bulk material is placed in melting that the new pig iron and foundry returns, which are placed in the sequence of smelting furnace, in one of the embodiments,
Around the sidewall of crucible of furnace, cobbing is placed in furnace bottom and the center of smelting furnace.
When the melting in-furnace temperature reaches 1420 degrees Celsius to 1450 degrees Celsius in one of the embodiments, observation
Wedge test piece fracture crystal grain thickness, color and chill width breed whether silicon amount increases in right amount compared with gray cast iron charger sheet requirement with determination
Add.
In one of the embodiments, it is described prepare molten iron during, thermal-insulating covering agent is added in smelting furnace.
The thermal-insulating covering agent is the alkalinity covering that CaO-Sio2-MgO is basic slag system in one of the embodiments,
Agent.
When the melting in-furnace temperature reaches 1450 degrees Celsius to 1480 degrees Celsius in one of the embodiments, cutting
Smelting furnace power supply rapidly scratches clean the slag on molten iron surface and thermal-insulating covering agent.
Gray cast iron casting technique of the invention, technical process is simple, and raw material sources are convenient, and the gray cast iron tension of casting is strong
Spend it is excellent, gray cast iron is unlikely to deform, and can reduce the production cost of enterprise.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below to specific reality of the invention
The mode of applying is described in detail.In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention.But
The invention can be embodied in many other ways as described herein, and those skilled in the art can be without prejudice to this hair
Similar improvement is done in the case where bright intension, therefore the present invention is not limited by the specific embodiments disclosed below.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
The present invention provides a kind of gray cast iron casting technique, gray cast iron casting technique includes the following steps:
Prepare furnace charge: taking the new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and the copper of predetermined dimension；The new pig iron returns
Furnace charge, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper all contain element needed for gray cast iron, foundry returns and carbon steel scrap source side
Just, the production cost that can reduce gray cast iron facilitates the content of control each element, and then controls the quality of production of gray cast iron.
First time melt: the new pig iron and foundry returns is taken to be placed in smelting furnace, the new pig iron of smelting furnace melting and foundry returns；
Second of melt: melting completely to the new pig iron and foundry returns, and carbon steel scrap, manganese iron, molybdenum-iron, silicon sequentially is added toward smelting furnace
Iron and copper, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper；The new pig iron and foundry returns sufficiently melt mixing, facilitate control each element
Content, and then control gray cast iron the quality of production.
Prepare molten iron: continuous heating smelting furnace so that melting in-furnace temperature keep 1300 degrees Celsius to 1500 degrees Celsius it
Between, molten iron is made；Melting in-furnace temperature keeps may make the new pig iron, foundry returns, carbon between 1300 degrees Celsius to 1500 degrees Celsius
Plain steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper；The new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper sufficiently melt,
Each Elemental partition of gray cast iron is uniform, promotes the quality of gray cast iron.
Prepare ladle: taking ladle heating, drying, inovulant packet bottom is added in ladle；Ladle uses capacity for 80 public affairs
Jin and 300 kilograms or so of ladle are selected according to the pouring technology arrangement of gray cast iron, after build cylinder-packing with a thickness of 30 millimeters extremely
45 millimeters, packet bottom be it is flat, if gray cast iron has particular/special requirement, can according to the requirement of gray cast iron select ladle.Also, inovulant
It is waterproof and dampproof, inovulant be baked at 200 degrees celsius it is dry after use.
It breeds molten iron: quickly molten iron being cast to ladle, stirs molten iron, so that inovulant melts, casting molten iron to mould
Tool；When molten iron discharging, answers the quick molten iron discharging of continuous uniform to requirement, bred using to be completed at the same time when current-following inoculation.
Casting gray cast iron: ladle casts molten iron to the type chamber of mold, type chamber coagulation forming of the molten iron according to mold, system
Obtain the gray cast iron of predetermined dimension.During ladle shifts molten iron, molten iron is stirred, melts inovulant all, heat preservation is added and covers
Molten iron and thermal-insulating covering agent are stirred in lid agent, and after scratching clean slag, molten iron is transported to casting place rapidly, and when casting should not allow continuously
Cutout, and should be avoided slag enter mold type it is intracavitary, to the end of casting, extract first case and last case and carry out hardness, metallographic
It examines, should posteriorly or anteriorly continue to survey sample when occurring unqualified.
The block of the new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper in one of the embodiments,
Degree be respectively the new pig iron less than 220 millimeters multiplied by 150 millimeters, foundry returns less than 150 millimeters multiplied by 150 millimeters, carbon steel scrap
Cross-sectional area is less than 100 square centimeters, 5 millimeters to 70 millimeters of manganese iron, 5 millimeters to 60 millimeters of molybdenum-iron, 5 millimeters of ferrosilicon to 15 millis
Rice, copper width and thickness be respectively smaller than 100 millimeters and 10 millimeters.The new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, silicon
The lumpiness of iron and copper takes above-mentioned specification, facilitate the new pig iron of smelting furnace rapid fusion, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron,
Ferrosilicon and copper, also, facilitate the content of control gray cast iron each element, and then control the quality of production of gray cast iron.
The smelting furnace is GW-0.25 type medium frequency response ratio in one of the embodiments,.GW-0.25 type intermediate frequency
Coreless induction furnace structure is simple, easy to maintenance using mechanical turndown.
It is that bulk material is placed in melting that the new pig iron and foundry returns, which are placed in the sequence of smelting furnace, in one of the embodiments,
Around the sidewall of crucible of furnace, cobbing is placed in furnace bottom and the center of smelting furnace.The new pig iron and foundry returns use such modes of emplacement, can
So that the new pig iron and the abundant fast melt of foundry returns, promote the production efficiency of enterprise.
When the melting in-furnace temperature reaches 1420 degrees Celsius to 1450 degrees Celsius in one of the embodiments, observation
Wedge test piece fracture crystal grain thickness, color and chill width breed whether silicon amount increases in right amount compared with gray cast iron charger sheet requirement with determination
Add.In gray cast iron production process, the mass fraction of the mass fraction of main control carbon and silicon, carbon and silicon is too low, and gray cast iron easily occurs
White structure, mechanical performance and casting character are all very low.When the mass fraction of carbon and silicon is excessively high, graphite flake is excessive and coarse, very
Extremely there is the floating of graphite in surface in molten iron, reduces the performance and quality of gray cast iron.Therefore, in gray cast iron production process,
Wedge test piece fracture crystal grain thickness, color and chill width need to be observed, whether silicon amount is bred compared with gray cast iron charger sheet requirement with determination
It is appropriate to increase.
In one of the embodiments, it is described prepare molten iron during, thermal-insulating covering agent is added in smelting furnace.
The thermal-insulating covering agent is the alkalinity covering that CaO-Sio2-MgO is basic slag system in one of the embodiments,
Agent.The use of thermal-insulating covering agent will not adapt to the thermal requirements of high, medium and low carbon or the aquatic production of ultra-low-carbon steel to molten steel recarburization,
CaO-Sio2-MgO is basic matterial, and the basicity of CaO-Sio2-MgO should be suitable with the basicity of steel slag, in making for thermal-insulating covering agent
With the basicity that will not reduce steel slag in the process, sulphur and rephosphorization are returned so as to avoid molten steel, also, CaO-Sio2-MgO contains greatly
The porosity and barrier conduction path, CaO-Sio2-MgO of amount have lower bulk density, and higher fusing point can make heat preserving agent exist
It is not easy to dissolve in use process, the long period can keep good thermal insulation property.
When the melting in-furnace temperature reaches 1450 degrees Celsius to 1480 degrees Celsius in one of the embodiments, cutting
Smelting furnace power supply rapidly scratches clean the slag on molten iron surface and thermal-insulating covering agent.
In conclusion in one or more embodiments of the invention, gray cast iron casting technique of the invention, technical process letter
Single, raw material sources are convenient, and the gray cast iron tensile strength of casting is excellent, gray cast iron is unlikely to deform, and can reduce being produced into for enterprise
This.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of gray cast iron casting technique, which is characterized in that the gray cast iron casting technique includes the following steps:
Prepare furnace charge: taking the new pig iron, foundry returns, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and the copper of predetermined dimension；
First time melt: the new pig iron and foundry returns is taken to be placed in smelting furnace, the new pig iron of smelting furnace melting and foundry returns；
Second of melt: melting completely to the new pig iron and foundry returns, and carbon steel scrap, manganese iron, molybdenum-iron, silicon sequentially is added toward smelting furnace
Iron and copper, carbon steel scrap, manganese iron, molybdenum-iron, ferrosilicon and copper；
Prepare molten iron: continuous heating smelting furnace, so that melting in-furnace temperature is kept between 1300 degrees Celsius to 1500 degrees Celsius, system
Obtain molten iron；
Prepare ladle: taking ladle heating, drying, inovulant packet bottom is added in ladle；
It breeds molten iron: quickly molten iron being cast to ladle, stirs molten iron, so that inovulant melts, casting molten iron to mold；
Casting gray cast iron: ladle casts molten iron to the type chamber of mold, and molten iron is made pre- according to the type chamber coagulation forming of mold
The gray cast iron of set pattern lattice.
2. gray cast iron casting technique according to claim 1, which is characterized in that the new pig iron, foundry returns, carbon steel scrap, manganese
Iron, molybdenum-iron, ferrosilicon and copper lumpiness be respectively that the new pig iron multiplies multiplied by 150 millimeters, foundry returns less than 150 millimeters less than 220 millimeters
With 150 millimeters, the cross-sectional area of carbon steel scrap less than 100 square centimeters, 5 millimeters to 70 millimeters of manganese iron, 5 millimeters of molybdenum-iron to 60 millis
Rice, 5 millimeters to 15 millimeters of ferrosilicon, copper width and thickness be respectively smaller than 100 millimeters and 10 millimeters.
3. gray cast iron casting technique according to claim 1, which is characterized in that smelting furnace is GW-0.25 type intermediate frequency centreless
Induction furnace.
4. gray cast iron casting technique according to claim 1, which is characterized in that the new pig iron and foundry returns are placed in smelting furnace
Sequence is that bulk material is placed in around the sidewall of crucible of smelting furnace, and cobbing is placed in furnace bottom and the center of smelting furnace.
5. gray cast iron casting technique according to claim 1, which is characterized in that melting in-furnace temperature reaches 1420 degrees Celsius
When to 1450 degrees Celsius, observation wedge test piece fracture crystal grain thickness, color and chill width are to determine whether breed silicon amount more grey
Cast iron charger sheet requires appropriate increase.
6. gray cast iron casting technique according to claim 1, which is characterized in that during preparing molten iron, add in smelting furnace
Enter thermal-insulating covering agent.
7. gray cast iron casting technique according to claim 6, which is characterized in that thermal-insulating covering agent is that CaO-Sio2-MgO is
The alkaline covering agent of basic slag system.
8. gray cast iron casting technique according to claim 7, which is characterized in that melting in-furnace temperature reaches 1450 degrees Celsius
When to 1480 degrees Celsius, smelting furnace power supply is cut off, rapidly scratches clean the slag on molten iron surface and thermal-insulating covering agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910925216.1A CN110499403A (en) | 2019-09-27 | 2019-09-27 | Gray cast iron casting technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910925216.1A CN110499403A (en) | 2019-09-27 | 2019-09-27 | Gray cast iron casting technique |
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| CN110499403A true CN110499403A (en) | 2019-11-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111112554A (en) * | 2020-01-13 | 2020-05-08 | 陈秋 | Method for manufacturing piston by using lost foam |
| CN111334634A (en) * | 2020-03-18 | 2020-06-26 | 苏州勤堡精密机械有限公司 | Gray cast iron casting process with high tensile strength and accurate feeding |
| CN114990418A (en) * | 2022-05-16 | 2022-09-02 | 上海金范机械铸造有限公司 | Method for manufacturing gray cast iron |
| CN115558841A (en) * | 2022-11-30 | 2023-01-03 | 南通冠峰铸造有限公司 | Processing technology of high-strength gray iron |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087847A (en) * | 2014-05-09 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Synthetic cast iron technology for producing high-strength grey cast iron |
-
2019
- 2019-09-27 CN CN201910925216.1A patent/CN110499403A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087847A (en) * | 2014-05-09 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Synthetic cast iron technology for producing high-strength grey cast iron |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111112554A (en) * | 2020-01-13 | 2020-05-08 | 陈秋 | Method for manufacturing piston by using lost foam |
| CN111334634A (en) * | 2020-03-18 | 2020-06-26 | 苏州勤堡精密机械有限公司 | Gray cast iron casting process with high tensile strength and accurate feeding |
| CN114990418A (en) * | 2022-05-16 | 2022-09-02 | 上海金范机械铸造有限公司 | Method for manufacturing gray cast iron |
| CN115558841A (en) * | 2022-11-30 | 2023-01-03 | 南通冠峰铸造有限公司 | Processing technology of high-strength gray iron |
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