CN109898010A - A kind of high-strength gray cast iron lathe casting electro-smelting technology - Google Patents
A kind of high-strength gray cast iron lathe casting electro-smelting technology Download PDFInfo
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- CN109898010A CN109898010A CN201910205937.5A CN201910205937A CN109898010A CN 109898010 A CN109898010 A CN 109898010A CN 201910205937 A CN201910205937 A CN 201910205937A CN 109898010 A CN109898010 A CN 109898010A
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Abstract
The invention discloses a kind of high-strength gray cast iron lathe casting electro-smelting technologies, a kind of high-strength gray cast iron lathe casting electro-smelting technology is the following steps are included: (1) hyperthermia and superheating is stood: for overtemperature at 1500-1530 DEG C, time of repose is 5-10 minutes；(2) 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%；(3) properly increase silicon carbon ratio: the content of silicon controls between 0.55-0.6%, and the content of sulphur controls between 0.06-0.12%.The present invention is realized from low-carbon-equivalent high-strength gray cast iron to high-carbon equivalent high-strength gray cast iron, this is not only comprehensive raising of improving cast iron quality, it is also the raising of melting links control technological level and the raising of quality management level, in the present invention under the conditions of carbon equivalent high (average value is 3.8%), realize the every mechanical performance and quality index of high-strength gray cast iron, and it is simple and convenient to manufacture process, can carry out large batch of production to it.
Description
Technical field
The present invention relates to ironcasting technical field, specially a kind of high-strength gray cast iron lathe casting electro-smelting 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 bears machine tool capability
Face sound 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
Greatly, cause dimensional accuracy stability poor, tearing tendency increases；Poor fluidity limits casting and is thinning；Poor processability is led
Cause the reduction of cutting speed and the decline of cutter life；Damping property is poor, leads to the reduction of machining accuracy and precision stability；It improves
The core of high-end numerically-controlled precise lathe casting quality is carbon equivalent high, high intensity, high rigidity and low stress, this is current lathe casting
The developing direction of part, technical difficulty is big, for this purpose, it is proposed that a kind of high-strength gray cast iron lathe casting electro-smelting technology.
Summary of the invention
The purpose of the present invention is to provide a kind of high-strength gray cast iron lathe casting electro-smelting technologies, to solve background skill
The problem of being proposed in art.
To achieve the above object, the invention provides the following technical scheme: a kind of high-strength gray cast iron lathe casting electric furnace is molten
Refining technology, a kind of high-strength gray cast iron lathe casting electro-smelting technology the following steps are included:
(1) hyperthermia and superheating is stood: for overtemperature at 1500-1530 DEG C, time of repose is 5-10 minutes；
(2) 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%；
(3) properly increase silicon carbon ratio: the content of silicon controls between 0.55-0.6%, the content control of sulphur 0.06-0.12% it
Between, casting elasticity modulus can be improved in such proportion mode, improves casting character, processing performance and molten iron metallurgical quality；
(4) Alloying Treatment: improving carbon equivalent must be added to alloying element and does and guarantees, common alloying element have copper, chromium, tin,
Antimony, molybdenum, nickel etc. consider economic factor, and cheap chromium, additional amount 0.2-0.3% is generally added in we；
(5) optimize inoculated technology: inoculation is optimized to it using inovulant, breed to duration of pouring control at 8-10 points
It within clock, breeds mode and is bred using two-stage, level-one is bred on electric furnace converter nose, carries out current-following inoculation by funnel；Second level is pregnant
It educates and wraps suspension funnel pouring, casting is carried out with stream instant inoculation.
Preferably, the high-quality carburant carries out carburetting using the high-quality carburant of high temperature graphitization.
Preferably, the inovulant uses the long-acting inovulant of silicon barium.
The present invention is realized from low-carbon-equivalent high-strength gray cast iron to high-carbon equivalent high-strength gray cast iron, this is not only cast iron
Comprehensive raising of quality and the raising of melting links control technological level and the raising of quality management level, the present invention
In under the conditions of carbon equivalent high (average value is 3.8%), realize the every mechanical performance and quality index of high-strength gray cast iron, and
And manufacturing process is simple and convenient, can carry out large batch of production to it.
Specific embodiment
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one:
A kind of high-strength gray cast iron lathe casting electro-smelting technology, a kind of high-strength gray cast iron lathe casting electro-smelting
Technology the following steps are included:
(1) hyperthermia and superheating is stood: for overtemperature at 1500 DEG C, time of repose is 5 minutes；
(2) change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is 55%, and pig iron ratio is 10%；
(3) properly increase silicon carbon ratio: the control of the content of silicon is 0.55%, and the content control of sulphur is 0.06%, such proportion mode
Casting elasticity modulus can be improved, improve casting character, processing performance and molten iron metallurgical quality；
(4) Alloying Treatment: improving carbon equivalent must be added to alloying element and does and guarantees, common alloying element have copper, chromium, tin,
Antimony, molybdenum, nickel etc. consider economic factor, and cheap chromium, additional amount 0.2% is generally added in we；
(5) optimize inoculated technology: inoculation optimized to it using inovulant, breed to the duration of pouring and control at 8 minutes,
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.
The high-quality carburant carries out carburetting using the high-quality carburant of high temperature graphitization.
The inovulant uses the long-acting inovulant of silicon barium.
Embodiment two:
A kind of high-strength gray cast iron lathe casting electro-smelting technology, a kind of high-strength gray cast iron lathe casting electro-smelting
Technology the following steps are included:
(1) hyperthermia and superheating is stood: for overtemperature at 1530 DEG C, time of repose is 10 minutes；
(2) change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is 53%, and pig iron ratio is 9%；
(3) properly increase silicon carbon ratio: the content control of silicon is 0.6%, and the content of sulphur is controlled 0.12%, and such proportion mode can
To improve casting elasticity modulus, improve casting character, processing performance and molten iron metallurgical quality；
(4) Alloying Treatment: improving carbon equivalent must be added to alloying element and does and guarantees, common alloying element have copper, chromium, tin,
Antimony, molybdenum, nickel etc. consider economic factor, and cheap chromium, additional amount 0.3% is generally added in we；
(5) optimize inoculated technology: inoculation is optimized to it using inovulant, breed to the duration of pouring and control at 10 points
Clock is bred mode and is bred using two-stage, and level-one is bred on electric furnace converter nose, carries out current-following inoculation by funnel；Second level is bred
It pours and wraps suspension funnel, casting is carried out with stream instant inoculation.
The high-quality carburant carries out carburetting using the high-quality carburant of high temperature graphitization.
The inovulant uses the long-acting inovulant of silicon barium.
Embodiment three:
A kind of high-strength gray cast iron lathe casting electro-smelting technology, a kind of high-strength gray cast iron lathe casting electro-smelting
Technology the following steps are included:
(1) hyperthermia and superheating is stood: for overtemperature at 1515 DEG C, time of repose is 8 minutes；
(2) change charge composition: adding the mode of high-quality carburant with big steel scrap amount, steel scrap ratio is 50%, and pig iron ratio is 9%；
(3) properly increase silicon carbon ratio: 0.58%, the content of sulphur controls such proportion between 0.09% for the content control of silicon
Casting elasticity modulus can be improved in mode, improves casting character, processing performance and molten iron metallurgical quality；
(4) Alloying Treatment: improving carbon equivalent must be added to alloying element and does and guarantees, common alloying element have copper, chromium, tin,
Antimony, molybdenum, nickel etc. consider economic factor, and cheap chromium, additional amount 0.25% is generally added in we；
(5) optimize inoculated technology: inoculation optimized to it using inovulant, breed to the duration of pouring and control at 9 minutes,
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.
The high-quality carburant carries out carburetting using the high-quality carburant of high temperature graphitization.
The inovulant uses the long-acting inovulant of silicon barium.
Table one: the chemical component of high-carbon equivalent high-strength gray cast iron
The metallurgical quality (average values of 60 heats) of two: HT300 lathe casting material of table
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, it is possible to understand that
These embodiments can be carried out with a variety of variations, modification, replacement without departing from the principles and spirit of the present invention and become
Type, the scope of the present invention is defined by the appended.
Claims (3)
1. a kind of high-strength gray cast iron lathe casting electro-smelting technology, it is characterised in that: a kind of high-strength gray cast iron machine
Bed casting electro-smelting technology the following steps are included:
(1) hyperthermia and superheating is stood: for overtemperature at 1500-1530 DEG C, time of repose is 5-10 minutes；
(2) 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%；
(3) properly increase silicon carbon ratio: the content of silicon controls between 0.55-0.6%, the content control of sulphur 0.06-0.12% it
Between, casting elasticity modulus can be improved in such proportion mode, improves casting character, processing performance and molten iron metallurgical quality；
(4) Alloying Treatment: improving carbon equivalent must be added to alloying element and does and guarantees, common alloying element have copper, chromium, tin,
Antimony, molybdenum, nickel etc. consider economic factor, and cheap chromium, additional amount 0.2-0.3% is generally added in we；
(5) optimize inoculated technology: inoculation is optimized to it using inovulant, breed to duration of pouring control at 8-10 points
It within clock, breeds mode and is bred using two-stage, level-one is bred on electric furnace converter nose, carries out current-following inoculation by funnel；Second level is pregnant
It educates and wraps suspension funnel pouring, casting is carried out with stream instant inoculation.
2. a kind of high-strength gray cast iron lathe casting electro-smelting technology according to claim 1, it is characterised in that: described
High-quality carburant carries out carburetting using the high-quality carburant of high temperature graphitization.
3. a kind of high-strength gray cast iron lathe casting electro-smelting technology according to claim 1, it is characterised in that: described
Inovulant uses the long-acting inovulant of silicon barium.
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| CN201910205937.5A CN109898010A (en) | 2019-03-19 | 2019-03-19 | A kind of high-strength gray cast iron lathe casting electro-smelting technology |
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| CN201910205937.5A CN109898010A (en) | 2019-03-19 | 2019-03-19 | A kind of high-strength gray cast iron lathe casting electro-smelting technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129509A (en) * | 2019-05-16 | 2019-08-16 | 芜湖久弘重工股份有限公司 | The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions |
| CN111673045A (en) * | 2020-03-13 | 2020-09-18 | 浙江浦江精宇铸造有限公司 | High-carbon-equivalent high-strength gray iron casting and lost foam casting process thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4121925A (en) * | 1974-01-15 | 1978-10-24 | Ferodo Limited | Method of producing grey cast iron brake rotors with uniform friction and wear characteristics |
| 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 |
| CN105088056A (en) * | 2015-07-24 | 2015-11-25 | 安徽大天铸业有限责任公司 | Manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron |
| CN105861920A (en) * | 2016-06-17 | 2016-08-17 | 沈阳铸造研究所 | High-dimensional-stability cast iron and preparing method thereof |
-
2019
- 2019-03-19 CN CN201910205937.5A patent/CN109898010A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4121925A (en) * | 1974-01-15 | 1978-10-24 | Ferodo Limited | Method of producing grey cast iron brake rotors with uniform friction and wear characteristics |
| 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 |
| CN105088056A (en) * | 2015-07-24 | 2015-11-25 | 安徽大天铸业有限责任公司 | Manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron |
| CN105861920A (en) * | 2016-06-17 | 2016-08-17 | 沈阳铸造研究所 | High-dimensional-stability cast iron and preparing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129509A (en) * | 2019-05-16 | 2019-08-16 | 芜湖久弘重工股份有限公司 | The electro-smelting technology of lathe casting is produced under a kind of high carbon conditions |
| CN111673045A (en) * | 2020-03-13 | 2020-09-18 | 浙江浦江精宇铸造有限公司 | High-carbon-equivalent high-strength gray iron casting and lost foam casting process thereof |
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