CN104325073A - Casting technology of wear-resistant and low-porosity steel casting - Google Patents
Casting technology of wear-resistant and low-porosity steel casting Download PDFInfo
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- CN104325073A CN104325073A CN201410577698.3A CN201410577698A CN104325073A CN 104325073 A CN104325073 A CN 104325073A CN 201410577698 A CN201410577698 A CN 201410577698A CN 104325073 A CN104325073 A CN 104325073A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a casting technology of a wear-resistant and low-porosity steel casting. The casting technology takes silica sand, bentonite, an additive and water as molding materials, and comprises the steps of preparing a casting mould by mixing the molding materials; drying the prepared casting mould with hot air at the temperature of 130-140 DEG C; injecting the dissolved metallic solution into the casting mould, and pouring a semi-finished product; carrying out heat treatment on the semi-finished product, polishing and machining to obtain the finished product; checking and putting into a storage. After the casting technology is adopted, the wear resistance and the toughness of the casting are greatly improved, the pores in the casting are reduced, and the service life of the casting is prolonged; furthermore, the casting technology is simple in operation and low in cost.
Description
Technical field
The present invention relates to a kind of casting technique of steel-casting, be specifically related to a kind of casting technique of wear-resisting low pore steel-casting, belong to casting technique field.
Background technology
Casting is the important production method of engineering goods blank, in national economy, occupy critical role.Along with the formation of united market, the world and the development of market economy, foundry enterprise is faced with keen competition day by day and stern challenge.Traditional casting designs the mode of production, and oneself can not adapt to the requirement of market to enterprise, and foundry enterprise must change traditional mode of production, introduces new technologies.At present in cast steel industry, steel-casting is when casting, usually want mfg. moulding die, cast and carry out the post-processed of foundry goods again, technics comparing is loaded down with trivial details, the defects such as the steel-casting that the method obtains easily cracks, sand holes, pore, have impact on product quality, for subsequent technique process causes very large difficulty, add production cost.Research and develop a kind of casting technique that can overcome the steel-casting of above defect and become those skilled in the art's technical problem urgently to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is, for the shortcoming that above prior art exists, a kind of casting technique of wear-resisting low pore steel-casting is proposed, this casting technique can improve wearability and the toughness of foundry goods greatly, reduce the pore on foundry goods, extend the service life of foundry goods, and simple to operate, cost is low.
The technical scheme that the present invention solves above technical problem is:
A casting technique for wear-resisting low pore steel-casting, is characterized in that, specifically comprise the following steps:
(1) casting mold is made with silica sand, bentonite, additive and water for Modeling Material is mixed;
Mixed processed time Modeling Material choose silica sand by mass percentage: 89%, bentonite: 7.5%, additive: 0.5 and water: 3.0 %, silica sand is mixed by 50/100-70/140 order silica sand, bentonite is sodium bentonite and calcium-base bentonite mixture, and additive is that α starch and dextrin mix by weight for the ratio of 4:1;
(2) adopt the hot blast of 130-140 DEG C to dry to the casting mold made in step (1), dry 0.5-1h;
(3) solvent metallic solution is injected the casting mold made and pour into semi-finished product;
(4) semi-finished product in step (3) heat-treated and carry out polishing and machining obtains finished product, and inspection warehouse-in;
Heat treated concrete operations are:
A anneals: by semi-finished product stove heat to 500-520 DEG C and blowing out after being incubated 0.5-1h, stove is cooled to 300-350 DEG C, opens fire door subsequently and continues slow cooling to 200-220 DEG C of air cooling of coming out of the stove to room temperature;
B quenches: by slow for the semi-finished product after annealing in step a stove heat to 400-425 DEG C, and stove heat uses Water spray semi-finished product fast cooling after 500-520 DEG C again;
C tempering: by through quenching after semi-finished product at room temperature again enter stove and stove heat to 200-250 DEG C after be incubated 1-1.5h after come out of the stove air cooling to room temperature.
The technical scheme that the present invention limits further is:
In the casting technique of the low pore steel-casting of foregoing wear, the granularity of silica sand is 3-4 sieve, and dioxide-containing silica >=94% in silica sand, clay content < 1%, moisture < 1%.
In the casting technique of the low pore steel-casting of foregoing wear, in step (1), bentonite is sodium bentonite and calcium-base bentonite sodium bentonite by weight: the ratio mixing of calcium-base bentonite=1:1.5.
In the casting technique of the low pore steel-casting of foregoing wear, carry out pouring into a mould in forward direction metallic solution in step (3) metallic solution add based on barium successively, lanthanum is auxiliary pretreating agent and after the static 5-10min of nodulizer metallic solution again surface on the slag making of spreading perlite also skim at once purify metallic solution.
In the casting technique of the low pore steel-casting of foregoing wear, nodulizer is for being magnesium Antaciron nodulizer.
In the casting technique of the low pore steel-casting of foregoing wear, in step (3) when metallic solution injection casting mold is poured into a mould, the duration of pouring is 5-10min, and the temperature of cast controls at 240-250 DEG C
The invention has the beneficial effects as follows:
Bentonite is adopted to be sodium base-calcium base mixing bentonite in the present invention, sodium bentonite, swelling value is high, excellent performance, with the molding sand of its preparation, there is anti-sand carrying capacity strong, the advantages such as Heat stability is good, and in pouring metal melt process, bentonite becomes dead clay and is inclined to little because being heated, namely bentonite durability is good, but sodium bentonite price is general slightly expensive, compared with sodium bentonite, the advantage of calcium-base bentonite is, the calcium-base bentonite molding sand mulling time is short, and molding sand green compression strength is high, good fluidity, is easy to knockout after cast.Use by the mode of these two kinds of bentonite mix and match, to give full play to respective advantage, decrease cost.
Additive in the present invention selects α starch and dextrin, α starch is uncooked amylum and water furnishing suspension, cools fast, levigately to make after Heat Gelatinization, α starch can keep the moisture of molding sand, avoid molding sand drying, cracking drop, improve molding sand toughness, stablize casting mold corner sand bond; Dextrin is a kind of intermediate product producing hydrolysis after starch adds water under acid and hot effect, and dextrin is the organic water soluble binding agent that a kind of wet strength and dry strength are all higher, and when dew is put, easy moisture absorption caking, almost can dissolve completely in cold water.Dextrin forms the starchiness colloidal sol of thickness after being dissolved in water, become and be slightly with flexible gel after drying and dewatering, and its hardening process belongs to reversible reaction, and hygroscopicity is lower than lignin liquor, but higher than syrup.The result of use of α starch and dextrin has obvious difference, and dextrin can significantly improve the surface strength of casting mold, hot green tensile strength and toughness, but green compression strength and mobility are obviously declined; Although α starch is to the surface strength of molding sand, hot green tensile strength, the raising of toughness is many not as dextrin, affects little on green compression strength and mobility.The present invention adopts α starch and dextrin to mix by weight the ratio of 1:1 hot green tensile strength can be made to increase severely, and toughness significantly improves, raising moulding-sand property.
The present invention first carries out hot-air seasoning to casting mold when pouring into a mould, the polishing workload in later stage can be reduced, reduce the workload of later stage soldering, reduce the pulling force between cold and hot molten steel in casting process, avoid organization internal to loosen and reduce the trickle pore generation of cast(ing) surface simultaneously.
The present invention after spheroidising spreading perlite to purify metallic solution, perlite is a kind of efficient deslagging agent, even spreading is behind the surface of metallic solution, stir a little and can be agglomerated into rapidly the skull being easy to metallic solution be separated, pure metallic solution can be obtained after pulling down skull, subduction foundry goods burning into sand, improve quality, and the cost of perlite itself is low, and not quick-friedly in use procedure not spatter, safe and reliable, easy to use, perlite is pollution-free to metallic solution, without infiltration, do not affect the mechanical performance of its chemical analysis and foundry goods, in using, smokeless free from dust and pernicious gas pollute, can environment purification, reach and carry out production strictly in line with rules and regulations.
Moulding by casting of the present invention carries out tempering to product after obtaining product, quenching, namely the combination property of the heat treatment raising product of annealing has hardness and also has certain toughness outward, the determination of heat treatment temperature should to obtain even and tiny austenite crystal for principle, to obtain tiny martensitic structure after quenching, growing up of austenite crystal is directly proportional to hardening heat, Water spray product fast cooling is adopted during quenching, and in time temper is carried out to product, the stress produced when can not only eliminate quenching, the tempered martensite of some can also be obtained, ensure that the high rigidity of product turn improves the toughness of product simultaneously.
Detailed description of the invention
embodiment 1
The present embodiment provides a kind of casting technique of wear-resisting low pore steel-casting, specifically comprises the following steps:
(1) casting mold is made with silica sand, bentonite, additive and water for Modeling Material is mixed;
Mixed processed time Modeling Material choose silica sand by mass percentage: 89%, bentonite: 7.5%, additive: 0.5 and water: 3.0 %, silica sand is mixed by 50/100-70/140 order silica sand, the granularity of silica sand is 3 sieves, and dioxide-containing silica >=94% in silica sand, clay content < 1%, moisture < 1%.
Bentonite is sodium bentonite and calcium-base bentonite mixture, sodium bentonite: calcium-base bentonite=1:1.5, and additive is that α starch and dextrin mix by weight for the ratio of 4:1;
(2) adopt the hot blast of 130 DEG C to dry to the casting mold made in step (1), dry 0.8h;
(3) add based on barium successively in solvent metallic solution, lanthanum is auxiliary pretreating agent and after the static 10min of magnesium Antaciron nodulizer metallic solution again surface on the slag making of spreading perlite to purify metallic solution and to skim at once, then the metallic solution after skimming is injected the casting mold made and pour into semi-finished product, the duration of pouring is 10min, and the temperature of cast controls at 250 DEG C;
(4) semi-finished product in step (3) heat-treated and carry out polishing and machining obtains finished product, and inspection warehouse-in;
Heat treated concrete operations are:
A anneals: by semi-finished product stove heat to 520 DEG C and blowing out after being incubated 1h, stove is cooled to 350 DEG C, opens fire door subsequently and continues slow cooling to 220 DEG C and come out of the stove air cooling to room temperature;
B quenches: by slow for the semi-finished product after annealing in step a stove heat to 410 DEG C, and stove heat uses Water spray semi-finished product fast cooling after 500 DEG C again;
C tempering: by through quenching after semi-finished product at room temperature again enter stove and stove heat to 250 DEG C after be incubated 1h after come out of the stove air cooling to room temperature.
embodiment 2
The present embodiment provides a kind of casting technique of wear-resisting low pore steel-casting, specifically comprises the following steps:
(1) casting mold is made with silica sand, bentonite, additive and water for Modeling Material is mixed;
Mixed processed time Modeling Material choose silica sand by mass percentage: 89%, bentonite: 7.5%, additive: 0.5 and water: 3.0 %, silica sand is mixed by 50/100-70/140 order silica sand, the granularity of silica sand is 4 sieves, and dioxide-containing silica >=94% in silica sand, clay content < 1%, moisture < 1%.
Bentonite is sodium bentonite and calcium-base bentonite mixture, sodium bentonite: calcium-base bentonite=1:1.5, and additive is that α starch and dextrin mix by weight for the ratio of 4:1;
(2) adopt the hot blast of 140 DEG C to dry to the casting mold made in step (1), dry 1h;
(3) add based on barium successively in solvent metallic solution, lanthanum is auxiliary pretreating agent and after the static 7min of magnesium Antaciron nodulizer metallic solution again surface on the slag making of spreading perlite to purify metallic solution and to skim at once, then the metallic solution after skimming is injected the casting mold made and pour into semi-finished product, the duration of pouring is 5min, and the temperature of cast controls at 245 DEG C;
(4) semi-finished product in step (3) heat-treated and carry out polishing and machining obtains finished product, and inspection warehouse-in;
Heat treated concrete operations are:
A anneals: by semi-finished product stove heat to 500 DEG C and blowing out after being incubated 0.5h, stove is cooled to 325 DEG C, opens fire door subsequently and continues slow cooling to 200 DEG C and come out of the stove air cooling to room temperature;
B quenches: by slow for the semi-finished product after annealing in step a stove heat to 420 DEG C, and stove heat uses Water spray semi-finished product fast cooling after 520 DEG C again;
C tempering: by through quenching after semi-finished product at room temperature again enter stove and stove heat to 235 DEG C after insulation 1.5 after come out of the stove air cooling to room temperature.
embodiment 3
The present embodiment provides a kind of casting technique of wear-resisting low pore steel-casting, specifically comprises the following steps:
(1) casting mold is made with silica sand, bentonite, additive and water for Modeling Material is mixed;
Mixed processed time Modeling Material choose silica sand by mass percentage: 89%, bentonite: 7.5%, additive: 0.5 and water: 3.0 %, silica sand is mixed by 50/100-70/140 order silica sand, the granularity of silica sand is 3 sieves, and dioxide-containing silica >=94% in silica sand, clay content < 1%, moisture < 1%.
Bentonite is sodium bentonite and calcium-base bentonite mixture, sodium bentonite: calcium-base bentonite=1:1.5, and additive is that α starch and dextrin mix by weight for the ratio of 4:1;
(2) adopt the hot blast of 135 DEG C to dry to the casting mold made in step (1), dry 0.5h;
(3) add based on barium successively in solvent metallic solution, lanthanum is auxiliary pretreating agent and after the static 5min of magnesium Antaciron nodulizer metallic solution again surface on the slag making of spreading perlite to purify metallic solution and to skim at once, then the metallic solution after skimming is injected the casting mold made and pour into semi-finished product, the duration of pouring is 8min, and the temperature of cast controls at 240 DEG C;
(4) semi-finished product in step (3) heat-treated and carry out polishing and machining obtains finished product, and inspection warehouse-in;
Heat treated concrete operations are:
A anneals: by semi-finished product stove heat to 510 DEG C and blowing out after being incubated 0.8h, stove is cooled to 300 DEG C, opens fire door subsequently and continues slow cooling to 210 DEG C and come out of the stove air cooling to room temperature;
B quenches: by slow for the semi-finished product after annealing in step a stove heat to 400 DEG C, and stove heat uses Water spray semi-finished product fast cooling after 510 DEG C again;
C tempering: by through quenching after semi-finished product at room temperature again enter stove and stove heat to 200 DEG C after be incubated 1.2h after come out of the stove air cooling to room temperature.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (6)
1. a casting technique for wear-resisting low pore steel-casting, is characterized in that, specifically comprise the following steps:
(1) casting mold is made with silica sand, bentonite, additive and water for Modeling Material is mixed;
Mixed processed time Modeling Material choose silica sand by mass percentage: 89%, bentonite: 7.5%, additive: 0.5 and water: 3.0 %, described silica sand is mixed by 50/100-70/140 order silica sand, described bentonite is sodium bentonite and calcium-base bentonite mixture, and described additive is that α starch and dextrin mix by weight for the ratio of 4:1;
(2) adopt the hot blast of 130-140 DEG C to dry to the casting mold made in step (1), dry 0.5-1h;
(3) solvent metallic solution is injected the casting mold made and pour into semi-finished product;
(4) semi-finished product in step (3) heat-treated and carry out polishing and machining obtains finished product, and inspection warehouse-in;
Described heat treated concrete operations are:
A anneals: by semi-finished product stove heat to 500-520 DEG C and blowing out after being incubated 0.5-1h, stove is cooled to 300-350 DEG C, opens fire door subsequently and continues slow cooling to 200-220 DEG C of air cooling of coming out of the stove to room temperature;
B quenches: by slow for the semi-finished product after annealing in step a stove heat to 400-425 DEG C, and stove heat uses Water spray semi-finished product fast cooling after 500-520 DEG C again;
C tempering: by through quenching after semi-finished product at room temperature again enter stove and stove heat to 200-250 DEG C after be incubated 1-1.5h after come out of the stove air cooling to room temperature.
2. the casting technique of wear-resisting low pore steel-casting according to claim 1, is characterized in that: the granularity of described silica sand is 3-4 sieve, and dioxide-containing silica >=94% in silica sand, clay content < 1%, moisture < 1%.
3. the casting technique of wear-resisting low pore steel-casting according to claim 1, is characterized in that: the bentonite described in step (1) is sodium bentonite and calcium-base bentonite sodium bentonite by weight: the ratio mixing of calcium-base bentonite=1:1.5.
4. the casting technique of wear-resisting low pore steel-casting according to claim 1, is characterized in that: carry out pouring into a mould in forward direction metallic solution in step (3) metallic solution add based on barium successively, lanthanum is auxiliary pretreating agent and after the static 5-10min of nodulizer metallic solution again surface on the slag making of spreading perlite also skim at once purify metallic solution.
5. the casting technique of wear-resisting low pore steel-casting according to claim 4, is characterized in that: described nodulizer is for being magnesium Antaciron nodulizer.
6. the casting technique of wear-resisting low pore steel-casting according to claim 1, is characterized in that: in step (3) when metallic solution injection casting mold is poured into a mould, the duration of pouring is 5-10min, and the temperature of cast controls at 240-250 DEG C.
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Cited By (12)
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| CN105436422A (en) * | 2015-12-28 | 2016-03-30 | 马占洪 | Heating radiator casting process |
| CN105689653A (en) * | 2016-01-19 | 2016-06-22 | 大丰市洪联铸钢有限责任公司 | Casting process for high-temperature water-pressure-resisting combined flange |
| CN106437597A (en) * | 2016-11-28 | 2017-02-22 | 墨宝股份有限公司 | Efficient, energy-saving and environment-friendly mechanical sealing device |
| CN106756429A (en) * | 2016-11-15 | 2017-05-31 | 墨宝股份有限公司 | A kind of casting technique of petroleum machinery preventer steel-casting |
| CN107414014A (en) * | 2017-08-15 | 2017-12-01 | 合肥正明机械有限公司 | A kind of high temperature resistant molding sand |
| CN107876732A (en) * | 2017-12-06 | 2018-04-06 | 博维恩冷冻科技（苏州）有限公司 | A kind of accurate high intensity compressor screw and its casting technique |
| CN107936658A (en) * | 2017-12-07 | 2018-04-20 | 博维恩冷冻科技（苏州）有限公司 | A kind of anti-corrosion electric pump case and its casting technique |
| CN107955538A (en) * | 2017-12-08 | 2018-04-24 | 苏州胤宗智能科技有限公司 | A kind of drop resistant rub resistance dumbbell and its casting technique |
| CN108018495A (en) * | 2017-12-15 | 2018-05-11 | 苏州威斯道智能科技有限公司 | A kind for the treatment of process of high accuracy travelling gear |
| CN108034900A (en) * | 2017-12-15 | 2018-05-15 | 博维恩冷冻科技（苏州）有限公司 | A kind of double air-out air coolers of high-performance and its shell moulding process |
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Cited By (13)
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| CN105436422A (en) * | 2015-12-28 | 2016-03-30 | 马占洪 | Heating radiator casting process |
| CN105689653A (en) * | 2016-01-19 | 2016-06-22 | 大丰市洪联铸钢有限责任公司 | Casting process for high-temperature water-pressure-resisting combined flange |
| CN106756429A (en) * | 2016-11-15 | 2017-05-31 | 墨宝股份有限公司 | A kind of casting technique of petroleum machinery preventer steel-casting |
| CN106437597A (en) * | 2016-11-28 | 2017-02-22 | 墨宝股份有限公司 | Efficient, energy-saving and environment-friendly mechanical sealing device |
| CN107414014B (en) * | 2017-08-15 | 2019-12-06 | 宿州速果信息科技有限公司 | High-temperature-resistant molding sand |
| CN107414014A (en) * | 2017-08-15 | 2017-12-01 | 合肥正明机械有限公司 | A kind of high temperature resistant molding sand |
| CN107876732A (en) * | 2017-12-06 | 2018-04-06 | 博维恩冷冻科技（苏州）有限公司 | A kind of accurate high intensity compressor screw and its casting technique |
| CN107936658A (en) * | 2017-12-07 | 2018-04-20 | 博维恩冷冻科技（苏州）有限公司 | A kind of anti-corrosion electric pump case and its casting technique |
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