CN103182476B - Technique for producing large and medium-sized cylindrical iron castings through clay green sand molding - Google Patents
Technique for producing large and medium-sized cylindrical iron castings through clay green sand molding Download PDFInfo
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- CN103182476B CN103182476B CN201310114892.3A CN201310114892A CN103182476B CN 103182476 B CN103182476 B CN 103182476B CN 201310114892 A CN201310114892 A CN 201310114892A CN 103182476 B CN103182476 B CN 103182476B
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Abstract
The invention relates to the processing field of sand mould casting, in particular to a technique for producing large and medium-sized cylindrical iron castings through a clay green sand molding. The technique achieves the application of the clay green sand molding process in the production and processing of the large and medium-sized iron castings, and is achieved through the following technical steps: molding sand preparation, modeling, core making, mold assembling, teeming, shakeout, cleaning, inspection and repair. The core making comprises the steps as follows: 1, designing a sand core structure, wherein the sand core is designed to be provided with a through hole structure or a blind hole structure in an axial direction, so that a cavity type structure is formed; 2, drawing drawings of an internal mold and an external mold; 3, adopting a steel plate to produce the internal mold and the external mold, wherein a plurality of exhaust through holes are formed uniformly in the internal mold; and 4, producing the cavity sand core. The technique provided by the invention is reasonable, simple, and convenient to implement; moreover, the implementation meets the requirements for energy conservation and emission reduction, the production cost can be saved effectively, the production technology process can be shortened, the production efficiency can be improved, and the economic benefits of enterprises can be increased; and the technique is mainly used for producing iron castings provided with the cylindrical characteristic such as middle-segment, bottom-segment castings and the like of a carbon disulfide gasification reacting furnace.
Description
Technical field
The present invention relates to sand casting field, specifically a kind of clay green sand molding produces the process of big-and-middle-sized tubular ironcasting.
Background technology
Clay-bonded sand mold casting is the conventional processing method of ironcasting, wherein, the casting of clay dry sand is the main production process of big-and-middle-sized ironcasting, technological process is: the oven dry-mould assembling-cast-knockout of sand conditioning-moulding-coremaking-casting mold (core) and cleaning-casting quality are checked and defect mending, in technique, core (i.e. outer sand mold and core) need be dried kiln through fire coal and dried, heating-up time is long, therefore energy consumption is very high, and can cause severe contamination to environment; Take volume as 50m
3the coal-fired drying oven of core be example, coal consumption about reaches 100 ㎏/h, each baking core calculated by 10 hours, about need coal 1.0 tons, as the core for cast of first drying one group of carbon disulfide gasification reacting furnace (main production equipments of carbon disulfide), nearly weigh 10-12 ton by one group of foundry goods and calculate (wherein: save foundry goods in one and nearly weigh 0.8 ton; A coxopodite foundry goods nearly weighs 1.5 tons), foundry goods per ton about needs with coal 0.084-0.1 ton.Consider that clay dry sand casting Yi Shi China Association of Casting and national Ministry of Industry and Information are defined as superseded backward production technology in " foundry enterprise access system ", the strategy of sustainable development is reduced discharging for complying with national energy-saving, in carbon disulfide gasification reacting furnace castings production technique, eliminate the coal-fired drying oven of core imperative.Although along with scientific and technological progress, the production of big-and-middle-sized ironcasting can adopt self-hardening sand molding, lost foam modeling, the moulding of V method etc. to realize without the technique of drying kiln bake oven baked core, but these technological equipment investment are large, and production cost is high, is not suitable with the production and processing of general ironcasting.And the casting of clay green-sand is the main production process of middle-size and small-size ironcasting, it is compared with clay dry sand casting technique, process costs is low, energy consumption is low, have relative competitive advantage, but be not applied to the production of large-sized iron casting at present, reason is that in casting pouring process, core inevitably will produce gas (the moisture heat in core must produce gas), pore can be produced in Iron Casting Surface, undoubtedly certain influence is caused to the quality of cast product.How avoiding pouring into a mould the gases affect of generation to casting quality in clay green-sand foundry technology process, is technological difficulties clay green-sand casting technique being applied to the processing of big-and-middle-sized iron casting production.
Summary of the invention
The present invention in order to realize the application of clay green-sand casting technique in big-and-middle-sized iron casting production processing, and produces the castings meeting technical requirement, provides the process that a kind of clay green sand molding produces big-and-middle-sized tubular ironcasting.
The present invention adopts following technical scheme to realize: clay green sand molding produces the process of big-and-middle-sized tubular ironcasting, realizes by following processing step: sand conditioning-moulding-coremaking-mould assembling-cast-knockout-cleaning-inspection and repairing; Coremaking step is as follows: the structure of 1, process the structural design correspondence core of tubular ironcasting according to institute, and described core is designed with through-hole structure or blind hole structure in the axial direction, formation cavity type structure; 2, according to the structure drafting internal mold of core, the drawing of external mold; 3, adopt steel plate to make internal mold, external mold according to drawing, wherein internal mold evenly offers some exhaust holes; 4, cavity core is made: external mold and internal mold are fixed on smooth floor, insert clay green-sand, slough external mold after tamping between external mold and internal mold, obtain cavity clay wet type core, wherein, being formulated in sand conditioning step of clay green-sand completes.Described sand conditioning, moulding, mould assembling, cast, knockout, cleaning, inspection and repairing are all the known technology of existing clay green-sand casting technique.
Compared with prior art, the present invention adopts cavity clay wet type core to substitute existing solid clay dry type core, the gas that in casting pouring process, core produces can be discharged via the through hole on core or blind hole, foundry goods inner surface effectively can be avoided to produce the defects such as pore, and then solve the technological difficulties that clay green-sand casting technique is applied to the processing of big-and-middle-sized iron casting production.And the reservation of internal mold effectively ensure that the strength and stiffness of core on core, and it is effectively ventilative to utilize the exhaust hole on internal mold to realize.Through production process test, the cast product of process production and processing of the present invention meets up-to-standard requirement, and serviceability and presentation quality are improved.Process of the present invention eliminates the processing step that core need be undertaken by coal-fired drying oven drying by clay dry sand casting technique, eliminate coal-fired oven dry kiln up hill and dale, not only achieve energy-saving and emission-reduction, shorten production process, and can effectively save production cost, enhance productivity, increase the economic benefit of enterprise, realize certain environmental and social benefits simultaneously.
Present invention process rationally, simply, is convenient to implement, and implements to meet energy-saving and emission-reduction requirement, effectively can save production cost, shorten production process, enhance productivity, increase the economic benefit of enterprise.Mainly for the production of joint and coxopodite foundry goods etc. in carbon disulfide gasification reacting furnace, there is the ironcasting of tubular feature.
Accompanying drawing explanation
Fig. 1 is the structural representation that existing solid sand core coordinates with outer sand mold;
Fig. 2 is the structural representation that cavity clay wet type core of the present invention coordinates with outer sand mold;
In figure: 1-solid sand core; The outer sand mold of 2-; 3-cavity clay wet type core; 4-ironcasting; 5-internal mold; 6-exhaust hole.
Detailed description of the invention
Clay green sand molding produces the process of big-and-middle-sized tubular ironcasting, realizes by following processing step: sand conditioning-moulding-coremaking-mould assembling-cast-knockout-cleaning-inspection and repairing; Coremaking step is as follows: the structure of 1, process the structural design correspondence core of tubular ironcasting according to institute, and described core is designed with through-hole structure or blind hole structure in the axial direction, formation cavity type structure; 2, according to the structure drafting internal mold of core, the drawing of external mold; 3, adopt steel plate to make internal mold 5, external mold according to drawing, wherein internal mold 5 evenly offers some exhaust holes 6; 4, cavity core is made: be fixed on smooth floor by external mold and internal mold 5, between external mold and internal mold 5, insert clay green-sand, after tamping, slough external mold, obtain cavity clay wet type core 3, wherein, being formulated in sand conditioning step of clay green-sand completes.During concrete enforcement, internal mold, external mold all adopt the thick A3 steel plate of at least 8mm to make.
Claims (1)
1. clay green sand molding produces a process for big-and-middle-sized tubular ironcasting, realizes by following processing step: sand conditioning-moulding-coremaking-mould assembling-cast-knockout-cleaning-inspection and repairing; It is characterized in that:
Coremaking step is as follows: the structure of 1), according to institute process the structural design correspondence core of tubular ironcasting, and described core is designed with through-hole structure or blind hole structure in the axial direction, formation cavity type structure; 2), according to structure drafting internal mold (5) of core, the drawing of external mold; 3), according to drawing adopt steel plate to make internal mold (5), external mold, wherein internal mold (5) evenly offers some exhaust holes (6); 4), cavity core is made: be fixed on smooth floor by external mold and internal mold (5), between external mold and internal mold (5), insert clay green-sand, after tamping, slough external mold, obtain cavity clay wet type core (3), wherein, being formulated in sand conditioning step of clay green-sand completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310114892.3A CN103182476B (en) | 2013-04-03 | 2013-04-03 | Technique for producing large and medium-sized cylindrical iron castings through clay green sand molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310114892.3A CN103182476B (en) | 2013-04-03 | 2013-04-03 | Technique for producing large and medium-sized cylindrical iron castings through clay green sand molding |
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| Publication Number | Publication Date |
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| CN103182476A CN103182476A (en) | 2013-07-03 |
| CN103182476B true CN103182476B (en) | 2015-04-15 |
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| CN201310114892.3A Expired - Fee Related CN103182476B (en) | 2013-04-03 | 2013-04-03 | Technique for producing large and medium-sized cylindrical iron castings through clay green sand molding |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480802A (en) * | 2013-09-27 | 2014-01-01 | 中核苏阀横店机械有限公司 | Novel sand core with steel plate |
| CN108044033B (en) * | 2017-12-06 | 2020-01-07 | 湖南三一路面机械有限公司 | Preparation method of milling drum, preparation method of milling machine and milling machine |
| CN108296443A (en) * | 2018-04-23 | 2018-07-20 | 溧阳市联华机械制造有限公司 | A kind of excavator shell casting sand mold hollow molding device |
| CN109807287A (en) * | 2019-02-20 | 2019-05-28 | 怀化辰州机械有限责任公司 | One kind blowing arsenic pipe sand casting type core and core manufacturing craft |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55136539A (en) * | 1979-04-11 | 1980-10-24 | Kubota Ltd | Centrifugal force core boring method |
| CN86209099U (en) * | 1986-11-13 | 1987-10-07 | 沈阳高中压阀门厂 | Centre-hollow sand core for casting with thin wall |
| US5119881A (en) * | 1990-03-07 | 1992-06-09 | Navistar International Transportation Corp. | Cylinder head casting core assembly and method |
| JPH06262296A (en) * | 1993-03-11 | 1994-09-20 | Nissan Motor Co Ltd | Core for casting and its manufacture |
| JPH07178509A (en) * | 1993-12-24 | 1995-07-18 | Toyota Motor Corp | Manufacture of hollow core |
| JP2003025046A (en) * | 2001-07-09 | 2003-01-28 | Kooee:Kk | Bar core for casting and its producing method |
| CN102974774A (en) * | 2012-12-10 | 2013-03-20 | 衡阳风顺车桥有限公司 | Production process of irregular ring type casting |
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Granted publication date: 20150415 Termination date: 20200403 |