CN109182637A - A kind of manufacturing method of compressor ball graphite cast-iron crankshaft - Google Patents
A kind of manufacturing method of compressor ball graphite cast-iron crankshaft Download PDFInfo
- Publication number
- CN109182637A CN109182637A CN201811134928.3A CN201811134928A CN109182637A CN 109182637 A CN109182637 A CN 109182637A CN 201811134928 A CN201811134928 A CN 201811134928A CN 109182637 A CN109182637 A CN 109182637A
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- China
- Prior art keywords
- furnace
- carburant
- steel scrap
- carries out
- added
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
-
- 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
-
- 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
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a kind of manufacturing fields of compressor ball graphite cast-iron crankshaft.A kind of manufacturing method of compressor ball graphite cast-iron crankshaft, using the manufacture for completing compressor ball graphite cast-iron crankshaft the step of mulling, moulding, furnace charge melting, spheroidising, inoculation, casting, cooling, peeling, quality inspection, in furnace charge fusion process, it is fitted into furnace after foundry returns, steel scrap, carburant are mixed as raw material and carries out melting；In spheroidizing process, the nodulizer that material quality 1% is added carries out spheroidising, while the inovulant that material quality 1.1% is added carries out an inoculation；Late inoculation processing is carried out in the inovulant that material quality 0.3% is added in inoculation process (casting process).It is combined using nodulizer of the present invention and carburant, can guarantee that iron liquid stablizes nodularization, extend fall time, become easy so that improving nodulizing grade.
Description
Technical field
The present invention relates to a kind of manufacturing fields of compressor ball graphite cast-iron crankshaft.
Background technique
Compressor ball graphite cast-iron crankshaft is the power-transmitting part of piston compressor.The extrinsic motives such as motor pass through song
Axis transfers power to compressor, and crankshaft drives another compressor part -- connecting rod mounted thereto, and revolution is transported
Turn turns to reciprocating motion, to realize the work of piston compressor.
Compressor ball graphite cast-iron crankshaft production technology includes: mulling, moulding, furnace charge melting, spheroidising, inoculation,
Casting, cooling, peeling, quality inspection.
Compressor ball graphite cast-iron crankshaft is an important spare part in compressor of air conditioner, is responsible for transmission power within the compressor.
The power of external world's input is transmitted on compressor by compressor ball graphite cast-iron crankshaft, by being connected with compressor ball graphite cast-iron crankshaft
Connecting rod, the rotary motion of compressor ball graphite cast-iron crankshaft is changed into the reciprocating motion of piston, and then realize piston compressor
Work.Since compressor ball graphite cast-iron crankshaft will be centrifuged during the work time by the effect of many kinds of force, including gas pressure
A variety of alternating loads such as power, while very big moment of flexure and torque effect are born again, therefore to guarantee compressor ball graphite cast-iron crankshaft
It also has higher requirements with very high intensity, rigidity, toughness and wearability, while to its surface and internal soundness.Therefore it selects
Suitable production technology with guarantee the quality of spherulitic iron crankshaft, reduce cost be very it is necessary to.
Summary of the invention
The technical problems to be solved by the present invention are: the compressor spheroidal graphite cast-iron for how providing a kind of low-cost and high-quality is bent
The manufacturing method of axis.
The technical scheme adopted by the invention is that: a kind of manufacturing method of compressor ball graphite cast-iron crankshaft using mulling, is made
The step of type, furnace charge melting, spheroidising, inoculation, casting, cooling, peeling, quality inspection, completes compressor spheroidal graphite
The manufacture of cast-iron crankshaft, in furnace charge fusion process, will foundry returns, steel scrap, carburant mix after as raw material be fitted into furnace into
Row melting；In spheroidizing process, the nodulizer that material quality 1% is added carries out spheroidising, while material quality is added
1.1% inovulant carries out an inoculation；The inovulant of material quality 0.3% is added at inoculation process (casting process)
Carry out late inoculation processing, wherein carburant additional amount is the 4% of waste steel quality, the graphite electricity that carburant is granularity 1-5mm
Pole carburant, nodulizer is the nodulizer of granularity 3-25mm, and in nodulizer, rare earth ER mass percent is 0.45-0.55%, Mg
Mass percent is 5.91-6.15%, and Si mass percent is that 45%, Ca mass percent is that 3.0%, Al mass percent is
0.5-0.6%, surplus are Fe and other impurity, and inovulant is 75 ferrosilicon, and inovulant granularity is 5- in an inoculation
25mm, late inoculation processing in inovulant granularity be 0.1-0.6mm.
As a kind of preferred embodiment: in raw material loading furnace process, in empty furnace, using steel scrap shop fixtures first, be then placed in increasing
The carburant of carbon agent gross mass 40%, is then placed in foundry returns, and melting once is directly carried out if foundry returns can fill up furnace,
Otherwise furnace is filled up with steel scrap carry out melting once；After all melting in furnace, the carburant of carburant gross mass 15% is added, uses
Steel scrap fills up furnace and carries out secondary smelting, fills up furnace with the carburant of carburant gross mass 15% and steel scrap repeatedly and carries out secondary smelting,
Until all addition finishes carburant；Furnace is filled up repeatedly with steel scrap after carburant all addition and carries out melting three times, directly
To steel scrap, all addition is finished；If filled up repeatedly when all addition is finished there is also remaining foundry returns steel scrap using foundry returns
Furnace carries out four meltings, until all addition finishes foundry returns；During adding furnace, temperature is maintained at 1350-1400 DEG C in furnace,
Temperature in furnace is increased to 1500 DEG C after all additions.
As a kind of preferred embodiment: mass percent >=98% of fixed carbon in graphite electrode carburant, biodiversity percentage
Than≤0.5%, sulphur content mass percent≤0.5, N element mass percent < 0.005%, other is impurity.
The beneficial effects of the present invention are: smelting time can be shortened using present invention proportion and method of smelting；Using this hair
The bright nodulizer and carburant combination, can guarantee that iron liquid stablizes nodularization, extend fall time, become so that improving nodulizing grade
It must be easy；Make final products medium pearlite content >=85%, tensile strength >=600MPa, elongation by inoculation twice
>=7%, hardness HBW240-270.
Detailed description of the invention
Fig. 1 is the metallographic microscope for the compressor ball graphite cast-iron crankshaft that the present invention makes；
Illustrate: white strip and block and circle shape are ferrite, are globular graphite in white circle, remaining dead color is pearlitic matrix
Body.
Specific embodiment
A kind of manufacturing method of compressor ball graphite cast-iron crankshaft using mulling, moulding, furnace charge melting, spheroidising, is bred
The step of processing, casting, cooling, peeling, quality inspection, completes the manufacture of compressor ball graphite cast-iron crankshaft, moulding: using
DISA3012 mould on end line, all fronts automation control is in horizontal arrangement mode using automatic modeling crankshaft casting, and molten iron passes through riser
Into casting.Furnace charge melting: quickly going up currently, casting industry is faced with furnace charge price, and especially the pig iron (steel scrap) price is not
Disconnected soaring reality.Under such an enviroment, it is each founder that melting cost is reduced by the adjustment of processing compound
Author is the problem of thinking deeply.Intermediate frequency furnace steel scrap recarburization process is exactly born thus and constantly universal new process.Steel scrap carburetting
Its essence of technique is exactly not have to or less with the pig iron, obtain the iron liquid of ingredient and performance qualification by technique adjustment, reduce casting
Cost.Smelting of iron is with middle frequency furnace (8 tons of middle frequency furnaces), and every 8 tons of furnace melting iron liquid.
In the present embodiment, in furnace charge fusion process, furnace is packed into as raw material after foundry returns, steel scrap, carburant are mixed
Middle carry out melting, wherein foundry returns is 1700kg, steel scrap 6000kg, carburant 240kg；It is empty in raw material loading furnace process
In furnace, 120kg steel scrap shop fixtures is used first, the carburant of 96kg is then placed in, is then placed in 1700 kg foundry returns, continuously adds
The steel scrap of 1340kg fills up furnace and carries out melting once, after all melting in furnace, 36 kg carburants is added, are then added
1600kg steel scrap fills up furnace and carries out secondary smelting, after all melting in furnace, 36 kg carburants is added, 1300kg is then added
Steel scrap fills up furnace and carries out melting three times, and after all melting in furnace, 36 kg carburants are added, and 910kg steel scrap is then added and fills up
Furnace is carried out melting once again, and after all melting in furnace, 36 kg carburants are added, and 680kg steel scrap is then added and fills up furnace
Melting once is carried out, after all being melted in furnace, remaining 50kg steel scrap is filled out as in furnace, is then increased to temperature in furnace
1500 DEG C, during adding furnace, temperature is maintained at 1350-1400 DEG C in furnace.
In spheroidizing process, the nodulizer that 77kg is added carries out spheroidising, while the inovulant of 84.7kg is added
Carry out an inoculation；Late inoculation processing is carried out in the inovulant that 23.1kg is added in inoculation process, wherein carburant
For the graphite electrode carburant of granularity 1-5mm, nodulizer is the nodulizer of granularity 3-25mm, in nodulizer, rare earth ER mass
Percentage is 0.45-0.55%, and Mg mass percent is 5.91-6.15%, and Si mass percent is that 45%, Ca mass percent is
3.0%, Al mass percent are 0.5-0.6%, and surplus is Fe and other impurity, and inovulant is 75 ferrosilicon, an inoculation
Middle inovulant granularity is 5-25mm, and inovulant granularity is 0.1-0.6mm in late inoculation processing.It is fixed in graphite electrode carburant
Mass percent>=98% of carbon, biodiversity percentage≤0.5%, sulphur content mass percent≤0.5, N element mass percent<
0.005%, other is impurity.
Claims (3)
1. a kind of manufacturing method of compressor ball graphite cast-iron crankshaft, using mulling, moulding, furnace charge melting, spheroidising, womb
The manufacture of the step of reason, casting, cooling, peeling, quality inspection completion compressor ball graphite cast-iron crankshaft, it is characterised in that:
In furnace charge fusion process, it is fitted into furnace after foundry returns, steel scrap, carburant are mixed as raw material and carries out melting；At nodularization
During reason, the nodulizer that material quality 1% is added carries out spheroidising, while the inovulant that material quality 1.1% is added carries out
Inoculation；Late inoculation processing is carried out in the inovulant that material quality 0.3% is added in casting process, wherein carburant adds
Enter 4% that amount is waste steel quality, carburant is the graphite electrode carburant of granularity 1-5mm, and nodulizer is the ball of granularity 3-25mm
Agent, in nodulizer, rare earth ER mass percent is 0.45-0.55%, and Mg mass percent is 5.91-6.15%, Si mass hundred
Dividing than being 45%, Ca mass percent is 3.0%, and Al mass percent is 0.5-0.6%, and surplus is Fe and others impurity, is bred
Agent is 75 ferrosilicon, and inovulant granularity is 5-25mm in an inoculation, and inovulant granularity is 0.1- in late inoculation processing
0.6mm。
2. a kind of manufacturing method of compressor ball graphite cast-iron crankshaft according to claim 1, it is characterised in that: filled in raw material
During furnace, in empty furnace, steel scrap shop fixtures is used first, the carburant of carburant gross mass 40% is then placed in, is then placed in and melts down
Material directly carries out melting once if foundry returns can fill up furnace, otherwise fills up furnace with steel scrap and carry out melting once；When in furnace
All after fusing, the carburant of carburant gross mass 15% is added, fills up furnace with steel scrap and carries out secondary smelting, use carburant repeatedly
The carburant and steel scrap of gross mass 15% fill up furnace and carry out secondary smelting, until all addition finishes carburant；When carburant whole
Furnace is filled up repeatedly with steel scrap after addition and carries out melting three times, until all addition finishes steel scrap；When steel scrap has all added
There is also remaining foundry returns by Bi Ruguo, fill up furnace repeatedly using foundry returns and carry out four meltings, until foundry returns has all added
Finish；During adding furnace, temperature is maintained at 1350-1400 DEG C in furnace, is increased to temperature in furnace after all additions
1500℃。
3. a kind of manufacturing method of compressor ball graphite cast-iron crankshaft according to claim 1, it is characterised in that: graphite electrode
Mass percent >=98% of fixed carbon in carburant, biodiversity percentage≤0.5%, sulphur content mass percent≤0.5, N member
Plain mass percent < 0.005%, other is impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811134928.3A CN109182637A (en) | 2018-09-28 | 2018-09-28 | A kind of manufacturing method of compressor ball graphite cast-iron crankshaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811134928.3A CN109182637A (en) | 2018-09-28 | 2018-09-28 | A kind of manufacturing method of compressor ball graphite cast-iron crankshaft |
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| CN109182637A true CN109182637A (en) | 2019-01-11 |
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| CN201811134928.3A Pending CN109182637A (en) | 2018-09-28 | 2018-09-28 | A kind of manufacturing method of compressor ball graphite cast-iron crankshaft |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063913A (en) * | 2020-09-03 | 2020-12-11 | 四川青江机器股份有限公司 | Method for producing ductile iron casting by using scrap steel |
| CN114990419A (en) * | 2022-06-22 | 2022-09-02 | 吉林省诚鼎精密铸造有限公司 | Method for smelting cast iron from scrap steel |
Citations (4)
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| CN107177711A (en) * | 2017-06-27 | 2017-09-19 | 江苏力源金河铸造有限公司 | A kind of smelting technology of thin-walled Ferrite nodular iron casting |
| CN107385312A (en) * | 2017-07-19 | 2017-11-24 | 济南德嘉机械有限公司 | A kind of production technology of the nodular iron castings of QT500 12 |
| CN107974611A (en) * | 2017-11-30 | 2018-05-01 | 江苏沃得机电集团有限公司 | A kind of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron and its production technology |
| CN108396219A (en) * | 2018-02-27 | 2018-08-14 | 第拖拉机股份有限公司 | A kind of bent axle As-Cast High-Strength Ductile Iron and preparation method thereof |
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2018
- 2018-09-28 CN CN201811134928.3A patent/CN109182637A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107177711A (en) * | 2017-06-27 | 2017-09-19 | 江苏力源金河铸造有限公司 | A kind of smelting technology of thin-walled Ferrite nodular iron casting |
| CN107385312A (en) * | 2017-07-19 | 2017-11-24 | 济南德嘉机械有限公司 | A kind of production technology of the nodular iron castings of QT500 12 |
| CN107974611A (en) * | 2017-11-30 | 2018-05-01 | 江苏沃得机电集团有限公司 | A kind of full smelting scrap steel casting QT900-5 spheroidal graphite cast-iron and its production technology |
| CN108396219A (en) * | 2018-02-27 | 2018-08-14 | 第拖拉机股份有限公司 | A kind of bent axle As-Cast High-Strength Ductile Iron and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063913A (en) * | 2020-09-03 | 2020-12-11 | 四川青江机器股份有限公司 | Method for producing ductile iron casting by using scrap steel |
| CN114990419A (en) * | 2022-06-22 | 2022-09-02 | 吉林省诚鼎精密铸造有限公司 | Method for smelting cast iron from scrap steel |
| CN114990419B (en) * | 2022-06-22 | 2023-10-27 | 吉林省诚鼎精密铸造有限公司 | Method for smelting cast iron by using scrap steel |
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Application publication date: 20190111 |