CN110129509A - The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions - Google Patents
The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions Download PDFInfo
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- CN110129509A CN110129509A CN201910406946.0A CN201910406946A CN110129509A CN 110129509 A CN110129509 A CN 110129509A CN 201910406946 A CN201910406946 A CN 201910406946A CN 110129509 A CN110129509 A CN 110129509A
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- China
- Prior art keywords
- electro
- carbon
- lathe
- casting
- smelting technology
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Classifications
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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
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
-
- 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
-
- 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
Abstract
The present invention relates to electro-smelting technical fields, and disclose the electro-smelting technology that lathe casting is produced under a kind of high carbon conditions, comprising the following steps: S1: hyperthermia and superheating is stood: iron liquid overtemperature is at 1500~1530 DEG C, and time of repose is in 5~10min；S2: change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is greater than 50%, and pig iron ratio uses the high-quality carburant carburetting of high temperature graphitization less than 10%；S3: improve silicon carbon ratio: by silicon carbon content control 0.55~0.6%, elasticity modulus is can be improved 0.06~0.12% in sulfur content control, improves casting character, processing performance and molten iron metallurgical quality；S4: Alloying Treatment: carbon equivalent is improved, alloying element is inwardly added；S5: optimization inoculated technology: the long-acting inovulant of silicon barium is used.It has been able to solve at present for a long time since the high intensity of China's lathe casting is obtained under low-carbon-equivalent, machine tool capability negatively affects big problem.
Description
Technical field
The present invention relates to electro-smelting technical field, the electro-smelting of lathe casting is produced under specially a kind of high carbon conditions
Technology.
Background technique
In the past 50 years, the precision of lathe has improved 100 times, has entered submicron order and nanoscale microstoning epoch.
The retentivity of high-precision and precision is the primary index of NC Machine Quality.In Metal Cutting Machine Tool gray iron casting technical conditions
Regulation is the foundation checked and accepted with mechanical property, and chemical component is not as acceptance basis, if user's needs can be another in contract
It orders.For a long time, this regulation causes the mistaken ideas in understanding in many lathe casting manufacturers, China: since with mechanical property
For acceptance criteria, and chemical component is not as acceptance criteria, then, reach high strength and high hardness to reduce the measure of carbon equivalent,
Then most easily realize.For a long time since the high intensity of China's lathe casting is obtained under low-carbon-equivalent, it is to lathe
The negative effect of performance is very big, and low-carbon-equivalent, high intensity generate the problem that: shrinking greatly, shrinkage cavity and porosity tendency is caused to increase；
Residual stress is big, causes dimensional accuracy stability poor, and tearing tendency increases；Poor fluidity limits casting and is thinning；Processability
Can be poor, lead to the reduction of cutting speed and the decline of cutter life；Damping property is poor, leads to the drop of machining accuracy and precision stability
It is low；The core for improving high-end numerically-controlled precise lathe casting quality is carbon equivalent high, high intensity, high rigidity and low stress, this is to work as
The developing direction of preceding lathe casting, technical difficulty are big.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides the electro-smelting skills that lathe casting is produced under a kind of high carbon conditions
Art has and realizes that every mechanical performance of high-strength gray cast iron refers to quality under the conditions of carbon equivalent high (average value is 3.8%)
Target advantage solves at present for a long time since the high intensity of China's lathe casting is obtained under low-carbon-equivalent, lathe
Big problem can be negatively affected.
(2) technical solution
To realize good surface quality, without the purpose at any subsequent auxiliary, the invention provides the following technical scheme:
The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions, comprising the following steps:
S1: hyperthermia and superheating is stood: iron liquid overtemperature is at 1500~1530 DEG C, and time of repose is in 5~10min；
S2: change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is greater than 50%, pig iron ratio
Example uses the high-quality carburant carburetting of high temperature graphitization less than 10%；
S3: improve silicon carbon ratio: by silicon carbon content control 0.55~0.6%, sulfur content is controlled 0.06~0.12%, can
To improve elasticity modulus, improve casting character, processing performance and molten iron metallurgical quality；
S4: Alloying Treatment: carbon equivalent is improved, alloying element is inwardly added；
S5: optimization inoculated technology: using the long-acting inovulant of silicon barium, breeds to duration of pouring control within 10min.
Preferably, in the S1 step, it is divided into the multistage when improving to bonded hard ferrite magnet and steps up, every phase temperature phase
Difference is in 300 DEG C.
Preferably, in the S2 step, steel scrap and pig iron surface are cleared up, reduce the content of miscellaneous material in furnace charge.
Preferably, in the S4 step, common alloying element has copper, chromium, tin, antimony, molybdenum, nickel etc., considers economic factor,
Cheap chromium, additional amount 0.3% is added.
Preferably, in the S5 step, the mode that breeds is bred using two-stage, and level-one is bred on electric furnace converter nose, is led to
It crosses funnel and carries out current-following inoculation；Second level, which is bred, wraps suspension funnel pouring, and casting is carried out with stream instant inoculation.
(3) beneficial effect
Compared with prior art, the present invention provides under a kind of high carbon conditions produce lathe casting electro-smelting technology,
Have it is following the utility model has the advantages that
1, the electro-smelting technology that lathe casting is produced under the high carbon conditions, in the case where tensile strength > 300Mpa,
The guide way hardness of the HT300 of high CE is 196HBW, and error is not more than 10HB；The hardness of the HT300 of low CE is 181HBW, and error is big
In 20HB；The factor of merit of high CE is 1.18, and the factor of merit of low CE is 0.94, sufficiently shows that the ironcasting of high CE is being greater than
There is good casting character and processing performance under the intensity of 300Mpa, high-intensitive, high rigidity, low stress.
Specific embodiment
It is clearly and completely described below in conjunction with the technical solution in the embodiment of the present invention, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff every other embodiment obtained without making creative work belongs to what the present invention protected
Range.
The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions, S1: hyperthermia and superheating is stood: iron liquid overtemperature
At 1500~1530 DEG C, in 5~10min, be divided into the multistage when improving to bonded hard ferrite magnet steps up time of repose, per stage
Temperature difference is in 300 DEG C；
S2: change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is greater than 50%, pig iron ratio
Example, using the high-quality carburant carburetting of high temperature graphitization, clears up steel scrap and pig iron surface less than 10%, reduces miscellaneous in furnace charge
The content of material；
S3: improve silicon carbon ratio: by silicon carbon content control 0.55~0.6%, sulfur content is controlled 0.06~0.12%, can
To improve elasticity modulus, improve casting character, processing performance and molten iron metallurgical quality；
Table one: the chemical component of high-carbon equivalent high-strength gray cast iron
S4: Alloying Treatment: improving carbon equivalent, be inwardly added alloying element, common alloying element have copper, chromium, tin,
Antimony, molybdenum, nickel etc. consider economic factor, cheap chromium, additional amount 0.3% are added；
S5: optimization inoculated technology: using the long-acting inovulant of silicon barium, breeds to duration of pouring control within 10min, described
It breeds mode to breed using two-stage, level-one is bred on electric furnace converter nose, carries out current-following inoculation by funnel；Second level is bred in casting ladle
Upper suspension funnel, casting are carried out with stream instant inoculation.
It is a leap in quality from low-carbon-equivalent high-strength gray cast iron to high-carbon equivalent high-strength gray cast iron, this is not only
It is comprehensive raising of improving cast iron quality and the raising of melting links control technological level and the raising of quality management level.
This " big step " is gone up, the training of worker, strict quality control and fine operation are very necessary.
The metallurgical quality (average values of 60 heats) of two: HT300 lathe casting material of table
As shown in Table 2, in the case where tensile strength > 300Mpa, the guide way hardness of the HT300 of high CE is 196HBW,
Error is not more than 10HB；The hardness of the HT300 of low CE is 181HBW, and error is greater than 20HB；The factor of merit of high CE is 1.18, low
The factor of merit of CE is 0.94, sufficiently shows that the ironcasting of high CE has good casting character under the intensity greater than 300Mpa
It is high-intensitive with processing performance, high rigid low stress.
It should be noted that term " includes " or any other variant thereof is intended to cover non-exclusive inclusion, thus
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not clear
The other element listed, or further include for elements inherent to such a process, method, article, or device.Do not having more
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that including process, the side of the element
There is also other identical elements in method, article or equipment.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. producing the electro-smelting technology of lathe casting under a kind of high carbon conditions, which comprises the following steps:
S1: hyperthermia and superheating is stood: iron liquid overtemperature is at 1500~1530 DEG C, and time of repose is in 5~10min；
S2: change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is greater than 50%, and pig iron ratio is less than
10%, use the high-quality carburant carburetting of high temperature graphitization；
S3: improve silicon carbon ratio: by silicon carbon content control 0.55~0.6%, sulfur content is controlled 0.06~0.12%, can be improved
Elasticity modulus improves casting character, processing performance and molten iron metallurgical quality；
S4: Alloying Treatment: carbon equivalent is improved, alloying element is inwardly added；
S5: optimization inoculated technology: using the long-acting inovulant of silicon barium, breeds to duration of pouring control within 10min.
2. producing the electro-smelting technology of lathe casting under a kind of high carbon conditions according to claim 1, it is characterised in that:
In the S1 step, it is divided into the multistage when improving to bonded hard ferrite magnet and steps up, every phase temperature difference is in 300 DEG C.
3. producing the electro-smelting technology of lathe casting under a kind of high carbon conditions according to claim 1, it is characterised in that:
In the S2 step, steel scrap and pig iron surface are cleared up, reduce the content of miscellaneous material in furnace charge.
4. producing the electro-smelting technology of lathe casting under a kind of high carbon conditions according to claim 1, it is characterised in that:
In the S4 step, common alloying element has copper, chromium, tin, antimony, molybdenum, nickel etc., considers economic factor, cheap chromium is added, adds
Entering amount is 0.3%.
5. producing the electro-smelting technology of lathe casting under a kind of high carbon conditions according to claim 1, it is characterised in that:
In the S5 step, the mode that breeds is bred using two-stage, and level-one is bred on electric furnace converter nose, is carried out by funnel pregnant with flowing
It educates；Second level, which is bred, wraps suspension funnel pouring, and casting is carried out with stream instant inoculation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910406946.0A CN110129509A (en) | 2019-05-16 | 2019-05-16 | The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions |
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| CN201910406946.0A CN110129509A (en) | 2019-05-16 | 2019-05-16 | The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060664A (en) * | 2011-10-19 | 2013-04-24 | 柳州市普和金属加工有限责任公司 | Casting technology for grey cast iron material of brake disc |
| CN104894466A (en) * | 2015-06-03 | 2015-09-09 | 郑州机械研究所 | High-strength, high-elasticity modulus and low-stress gray cast iron and manufacturing method thereof |
| CN105861920A (en) * | 2016-06-17 | 2016-08-17 | 沈阳铸造研究所 | High-dimensional-stability cast iron and preparing method thereof |
| CN109898010A (en) * | 2019-03-19 | 2019-06-18 | 芜湖久弘重工股份有限公司 | A kind of high-strength gray cast iron lathe casting electro-smelting technology |
-
2019
- 2019-05-16 CN CN201910406946.0A patent/CN110129509A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060664A (en) * | 2011-10-19 | 2013-04-24 | 柳州市普和金属加工有限责任公司 | Casting technology for grey cast iron material of brake disc |
| CN104894466A (en) * | 2015-06-03 | 2015-09-09 | 郑州机械研究所 | High-strength, high-elasticity modulus and low-stress gray cast iron and manufacturing method thereof |
| CN105861920A (en) * | 2016-06-17 | 2016-08-17 | 沈阳铸造研究所 | High-dimensional-stability cast iron and preparing method thereof |
| CN109898010A (en) * | 2019-03-19 | 2019-06-18 | 芜湖久弘重工股份有限公司 | A kind of high-strength gray cast iron lathe casting electro-smelting technology |
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