CN103639368A - Casting method for large-size electric driving ship propeller bracket casting piece - Google Patents
Casting method for large-size electric driving ship propeller bracket casting piece Download PDFInfo
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Abstract
The invention provides a casting method for a large-size electric driving ship propeller bracket casting piece. The casting method comprises the following steps: (1) manufacturing a die; (2) manufacturing a sand core; (3) arranging a pouring gate; (4) arranging a sand box; (5) casting and molding. In the manufacturing process of a casting piece die and a sand core die, the two dies are manufactured in a splitting manner and respective dies are divided into a plurality of single bodies according to the appearances of the casting piece and the sand core to carry out independent manufacturing; the manufactured casting die single bodies are stuck and spliced by glue to form a complete die; then the assembled die is fixedly arranged on a template; a track generated in the die manufacturing process is filled by using putty; then the die is dried and polished to be smooth; an air pore which is formed after polishing is refilled and ground to finish the manufacturing of the casting piece die; the sand core die is manufactured by using the same process; the quality requirements that the large-size electric driving ship propeller bracket casting piece can be used as a propeller fixing platform, an electric power transmission channel and a propeller repairing service channel, and the surface of the casting piece is also used as a helm to change the direction of a water flow can be met.
Description
Technical field
The present invention relates to the casting field of foundry goods, specifically a kind of casting method of large-scale electric drive propeller for vessels bracket casting.
Background technology
Along with International Maritime Organization is formulating more and more stricter standard aspect boats and ships discharge, add that petroleum resources exhaust gradually, internal combustion engine will progressively step down from the stage of history, and the electric propulsion system of environmental protection will become the direction of following ship power development.Developed polytype electric propulsion system abroad, and applied on many types of boats and ships.China is at the early-stage in the research in this field.
Compare with traditional ship power system, electric propulsion system has that speed adjustable range is wide, driving force is large, be easy to rotating, volume is little, layout is flexible, easy for installation, be convenient to the advantages such as maintenance, vibration and noise are little.Electric propulsion is as the novel thrust power of boats and ships, and deep research is all being carried out in countries in the world.As the electric propulsion system of boats and ships main power system, due to its high efficiency, high reliability, high automation and low maintenance, just becoming the basic propulsion system of new century large-scale water surface boats and ships favor.For same power boats and ships, the medium seed diesel engine in electric propulsion can be all the time in the work of best effort district, oil inflame quality is good, the amount of nitrogen oxides in combustion product is few, has reduced toxic emission, makes in cabin air fresh, environmental quality improves.
Propeller bracket is the critical component that is used in boats and ships and ocean macrotype platform electrically-actuated device, and as screw fixed platform and electric power transfer passage, screw maintenance service passage, cast outer surface doubles as rudder for ship and changes the direction of a stream of water.Structure, size, material directly have influence on travelling of whole boats and ships and ocean macrotype platform and fixing, and the critical process of casting this series products is guaranteed the quality of materials of foundry goods, casting deformation amount and size and little residual stress.
Propeller bracket parts monomer weight is large, and mechanical performance requires high, has the casting difficulty of professional in production.Particularly casting section thickness differs greatly, and contour structures is irregular, and all with arc surface transition, inner-cavity structure is complicated, and molten iron pours into after casting mold, and three directions of length of generation are shunk inconsistent, can produce very large stress, cause casting deformation.
Summary of the invention
Technical problem to be solved by this invention is: the casting method that a kind of large-scale electric drive propeller for vessels bracket casting is provided, meet in foundry goods and there is no the defects such as shrinkage cavity and porosity, slag inclusion, can reach as screw fixed platform and electric power transfer passage, screw maintenance service passage, cast outer surface and double as the quality requirement that rudder for ship is changed the direction of a stream of water.
The technical solution used in the present invention is to provide a kind of casting method of large-scale electric drive propeller for vessels bracket casting, it is characterized in that: comprise the following steps: 1) mould manufacture; 2) core manufacture; 3) running channel setting; 4) sandbox setting; 5) moulding by casting;
Described step 1) mould manufacture comprises: casting die manufacture and core mold manufacture, and two moulds all adopt split manufacture, and according to the profile of foundry goods and core, mould are separately divided into polylith monomer respectively and make separately; The casting die monomer making is first glued together and is assemblied to form complete mould by glue, then the mould assembling is fixed on template, the vestige producing in die manufacture is filled with atomized ash, after dry, polishing, to level and smooth, is filled the making of the casting die of having polished again to the pore occurring after polishing; Adopt same process to manufacture core mold;
Described step 2) core manufacture, is used the monomer core mold in step 1) to manufacture independently monomer core, then each monomer assembly of sand core is become core whole; Wherein, when making core, steel pipe is set in core and steel plate is used for the intensity of core to strengthen, sand core strength is controlled at: 0.9～1.0MPa;
During described step 3) running channel arranges, complete the setting of running gate system when manufacturing external form molding sand, external form sand bond is controlled at: 1.3～1.4MPa; Wherein, running gate system comprises sprue, cross gate, ingate, rising head, gives vent to anger and die cavity, at rectangular flat die cavity place, the ingate of rectangular flat is set and is communicated with die cavity, bending is set on the ingate of rectangular flat again to be cushioned potting syrup, annular transition running channel is set between half-spherical cavity structure die cavity place and cross gate, and transition running channel is communicated with half-spherical cavity structure die cavity by equally distributed a plurality of ingates again;
Described step 4) cheek is mainly divided into three parts: under casing, raising middle flask and upper cover are also connected and fixed assembling successively, under casing, raising middle flask and on cover the working hole all arranging for chill, fixing some the required component placement of core, after putting sand and finishing, with bolt, outside sandbox, sandbox is carried out to banding again;
Described step 5) is as follows to potting syrup component and potting syrup temperature requirement while pouring into a mould: potting syrup chemical constituent is: carbon: 3.65%～3.75%, silicon: 2.20%～2.65%, manganese :≤0.30%, phosphorus :≤0.04%, sulphur :≤0.01%, remaining magnesium: 0.04%～0.06%, residual Re :≤0.02%, nodulizer: 1.1%～1.25%, inovulant: 0.8%～1.0%, all the other are iron;
Potting syrup temperature is: 1325 ℃～1350 ℃;
Inovulant divides secondary to add, and once breeds: while tapping a blast furnace, pregnant amount is 0.6%～0.7%; Late inoculation: quantitatively in bag, pregnant amount is 0.2%～0.3%.
Nodulizer in described step 5) is light rare earth magnesium alloy.
Described step 5) once breeds for common barium silicon inoculant, and late inoculation is special-purpose square shape inovulant.Once breed: silicon titanate particle is 3-8(mm); Late inoculation: be of a size of 90*60*60, composition is Si72 ± 1%, Al≤1.2%, S≤0.02%, Ca1.0 ± 0.3%, Ba2 ± 0.4%.
Nodulizer in described step 5) is light rare earth magnesium alloy.
Described step 5) once breeds for common barium silicon inoculant, and late inoculation is special-purpose square shape inovulant, wherein, and while once breeding: silicon titanate particle is 3-8(mm); Late inoculation: inovulant is of a size of 90*60*60, composition is Si:72 ± 1%, Al :≤1.2%, S :≤0.02%, Ca:1.0 ± 0.3%, Ba:2 ± 0.4%, surplus is iron.
The casting method of the large-scale electric drive propeller for vessels of the present invention bracket casting has following advantage:
Concrete structure in view of core, split production is beneficial to the precision that guarantees each position, can steel pipe and steel plate structure be set according to the concrete structure at each position again, at long flat place, just with steel pipe, cannot guarantee enough supports, core will be out of shape, use separately steel pipe because the diameter of steel pipe is larger, long flat structure cannot be held more steel pipe, therefore, the structure of using steel pipe and steel plate to combine at long flat structure place, can guarantee the structural strength of core, avoid core to be out of shape because of reasons in structure, this step is the important measures that guarantee sand core strength, guaranteeing under the prerequisite of sand core strength, by improving splicing accuracy, complete again the integral manufacturing of core, could support qualified core like this, avoid being in use out of shape, and according to the design feature of foundry goods, running channel by rectangular structure solves the impact of potting syrup to die cavity when pouring into a mould, be particularly suitable for using in thering is the die cavity of rectangular structure, potting syrup has higher buffering effect in the connection running channel of rectangular structure, make potting syrup can enter into very stably die cavity, effectively avoid the impact to die cavity, avoid occurring the appearance of the defects such as burning into sand, and the present invention also improved the uniformity of potting syrup composition, guaranteed the quality of potting syrup.
The specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
The casting method of the large-scale electric drive propeller for vessels of the present invention bracket casting, comprises the following steps: 1) mould manufacture; 2) core manufacture; 3) running channel setting; 4) sandbox setting; 5) moulding by casting;
Wherein, described step 1) mould manufacture comprises: casting die manufacture and core mold manufacture, and two moulds all adopt split manufacture, and according to the profile of foundry goods and core, mould are separately divided into polylith monomer respectively and make separately; The casting die monomer making is first glued together and is assemblied to form complete mould by glue, then the mould assembling is fixed on template, firm, durable for guaranteeing the overall structure of assembling die, to somatotype, minute block part and combination, require as follows: 1) the making material of each somatotype piece faying face must be inside and outside consistent, must be closely knit seamless between faying face; 2) somatotype piece ingredient need must rift grain be spelled system by mould number of unmolulding directions, with the flooring nail that run through by nail material 1/3 reinforces after selecting white glue to paste during ingredient, and flooring nail is reinforced in length and breadth spacing in 150mm left and right; 3) the machined surface inwall dead size of each minute block part guarantees more than 150mm, and sets off with 100 * 40mm lining gear, and lining gear spacing is in 300mm left and right; 4) can not there is lacking material, delamination in ingredient piece when machining.The vestige producing in casting die manufacture process is filled with atomized ash, and dry rear polishing, to level and smooth, is filled the making of the casting die of having polished again to the pore occurring after polishing; Adopt same process to manufacture core mold, core mold also will be filled polishing.
Described step 2) the core split production in, is used the monomer core mold in step 1) to manufacture independently monomer core, then each monomer assembly of sand core is become core whole; Wherein, when making core, steel pipe is set in core and steel plate is used for the intensity of core to strengthen, sand core strength is controlled at: 0.9～1.0MPa; Integral sand core size is large, vertical direction is located without core, by location, horizontal direction two, in core centre, place special arbor guarantee core do not rupture, indeformable, and core is located not brigadier and is caused whole casting section thickness skew, by drag hook and core, sandbox outer wall Dual positioning are set in core, guarantee each core accurate positioning.
In described step 3), manufacturing the setting that completes running gate system when external form molding sand is manufactured, external form sand bond is controlled at: 1.3～1.4MPa; Wherein, running gate system comprises sprue, cross gate, ingate, rising head, gives vent to anger and die cavity, at rectangular flat die cavity place, the ingate of rectangular flat is set and is communicated with die cavity, bending is set on the ingate of rectangular flat again to be cushioned potting syrup, annular transition running channel is set between half-spherical cavity structure die cavity place and cross gate, and transition running channel is communicated with half-spherical cavity structure die cavity by equally distributed a plurality of ingates again; Because foundry goods profile is irregular, running gate system position is difficult to determine, should moulding facilitate, and guarantees that again molten iron can steadily enter die cavity.Adopt the horizontal perpendicular cast direction of watering of doing, there is the running gate system of pushing off the slag effect, make iron liquid steadily enter die cavity from the bottommost of foundry goods, guarantee the inherent quality of foundry goods.
Described step 4) cheek is mainly divided into three parts: under casing, raising middle flask and upper cover are also connected and fixed assembling successively, under casing, raising middle flask and on cover the working hole all arranging for chill, fixing some the required component placement of core, after putting sand and finishing, with bolt, outside sandbox, sandbox is carried out to banding again; Because casting section thickness differs greatly, thickest 200mm, minimum wall thickness (MINI W.) 70mm, contour structures is irregular, all, with arc surface transition, inner-cavity structure is complicated, and molten iron pours into after casting mold, three directions of length that produce are shunk inconsistent, can produce very large stress, cause casting deformation.By core outside, reinforce, control suitable intensity, make foundry goods have enough release stress-spaces, reach foundry goods variable in effective range.
As follows to potting syrup component, potting syrup temperature and the requirement duration of pouring when described step 5) is poured into a mould:
Embodiment 1:
Potting syrup chemical constituent is: phosphorus content 3.70%, and silicon content 2.50%, manganese content 0.18%, phosphorus content 0.02%, sulfur content 0.0085%, surplus is iron;
Pouring temperature is 1335 ℃, and be 60s the duration of pouring;
Nodulizer addition is 1.18%, and inovulant divides secondary to add, and once breeds: while tapping a blast furnace, pregnant amount is 0.7%; Late inoculation: quantitatively in bag, pregnant amount is 0.2%,, wherein, while once breeding: silicon titanate particle is 3mm; Late inoculation: inovulant is of a size of 90*60*60, composition is Si:71%, Al:1.0%, S:0.15%, Ca:0.8%, Ba:1.8%, surplus is iron.
Embodiment 2:
Potting syrup chemical constituent is: phosphorus content 3.68%, and silicon content 2.45%, manganese content 0.25%, phosphorus content 0.026%, sulfur content 0.0067%, surplus is iron;
Pouring temperature is 1343 ℃, and be 56s the duration of pouring;
Nodulizer addition is 1.15%, and inovulant divides secondary to add, and once breeds: while tapping a blast furnace, pregnant amount is 0.65%; Late inoculation: quantitatively in bag, pregnant amount is 0.22%.
As corrective measure, in two above-mentioned embodiment, the nodulizer in step 5) is light rare earth magnesium alloy.
Described step 5) once breeds for common barium silicon inoculant, and late inoculation is special-purpose square shape inovulant.Once breed: silicon titanate particle is 3-8(mm); Late inoculation: be of a size of 90*60*60, composition is Si72 ± 1%, Al≤1.2%, S≤0.02%, Ca1.0 ± 0.3%, Ba2 ± 0.4%,, wherein, while once breeding: silicon titanate particle is 8mm; Late inoculation: inovulant is of a size of 90 * 60 * 60, composition is Si:73%, Al:1.2%, S:0.02%, Ca:1.3%, Ba:2.4%, surplus is iron.
Claims (3)
1. a casting method for large-scale electric drive propeller for vessels bracket casting, is characterized in that: comprise the following steps: 1) mould manufacture; 2) core manufacture; 3) running channel setting; 4) sandbox setting; 5) moulding by casting;
Described step 1) mould manufacture comprises: casting die manufacture and core mold manufacture, and two moulds all adopt split manufacture, and according to the profile of foundry goods and core, mould are separately divided into polylith monomer respectively and make separately; The casting die monomer making is first glued together and is assemblied to form complete mould by glue, then the mould assembling is fixed on template, the vestige producing in die manufacture is filled with atomized ash, after dry, polishing, to level and smooth, is filled the making of the casting die of having polished again to the pore occurring after polishing; Adopt same process to manufacture core mold;
Described step 2) core manufacture, is used the monomer core mold in step 1) to manufacture independently monomer core, then each monomer assembly of sand core is become core whole; Wherein, when making core, steel pipe is set in core and steel plate is used for the intensity of core to strengthen, sand core strength is controlled at: 0.9～1.0MPa;
During described step 3) running channel arranges, manufacturing the setting that completes running gate system when external form molding sand is manufactured, external form sand bond is controlled at: 1.3～1.4MPa; Wherein, running gate system comprises sprue, cross gate, ingate, rising head, gives vent to anger and die cavity, at rectangular flat die cavity place, the ingate of rectangular flat is set and is communicated with die cavity, bending is set on the ingate of rectangular flat again to be cushioned casting liquid, annular transition running channel is set between half-spherical cavity structure die cavity place and cross gate, and transition running channel is communicated with half-spherical cavity structure die cavity by equally distributed a plurality of ingates again;
Described step 4) cheek is mainly divided into three parts: under casing, raising middle flask and upper cover are also connected and fixed assembling successively, under casing, raising middle flask and on cover the working hole all arranging for chill, fixing some the required component placement of core, after putting sand and finishing, with bolt, outside sandbox, sandbox is carried out to banding again;
Described step 5) moulding by casting, as follows to potting syrup component and potting syrup temperature requirement during cast: potting syrup chemical constituent is: carbon: 3.65%～3.75%, silicon: 2.20%～2.65%, manganese :≤0.30%, phosphorus :≤0.04%, sulphur :≤0.01%, remaining magnesium: 0.04%～0.06%, residual Re :≤0.02%, nodulizer: 1.1%～1.25%, inovulant: 0.8%～1.0%, all the other are iron;
Potting syrup temperature is: 1325 ℃～1350 ℃;
Inovulant divides secondary to add, and once breeds: while tapping a blast furnace, pregnant amount is 0.6%～0.7%; Late inoculation: quantitatively in bag, pregnant amount is 0.2%～0.3%.
2. the casting method of large-scale electric drive propeller for vessels bracket casting according to claim 1, is characterized in that: the nodulizer in described step 5) is light rare earth magnesium alloy.
3. the casting method of large-scale electric drive propeller for vessels bracket casting according to claim 1, it is characterized in that: described step 5) once breeds for common barium silicon inoculant, late inoculation is special-purpose square shape inovulant, wherein, and while once breeding: silicon titanate particle is 3-8(mm); Late inoculation: inovulant is of a size of 90*60*60, composition is Si:72 ± 1%, Al :≤1.2%, S :≤0.02%, Ca:1.0 ± 0.3%, Ba:2 ± 0.4%, surplus is iron.
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| CN103878314A (en) * | 2014-03-27 | 2014-06-25 | 舟山市定海区龙叶螺旋桨制造有限公司 | Propeller pouring technology |
| CN104384442A (en) * | 2014-11-07 | 2015-03-04 | 甘肃酒钢集团西部重工股份有限公司 | Method for fabricating calcium carbide pan |
| CN105817587A (en) * | 2016-04-06 | 2016-08-03 | 台州市椒江永固船舶螺旋桨厂 | Pouring technology for marine propeller |
| CN106513582A (en) * | 2016-12-31 | 2017-03-22 | 马鞍山市海天重工科技发展有限公司 | Gating system for semi-curved pipe |
| CN106513589A (en) * | 2016-12-31 | 2017-03-22 | 马鞍山市海天重工科技发展有限公司 | Manufacture method of half-bent pipes |
| CN108817327A (en) * | 2018-06-25 | 2018-11-16 | 宁波拓铁机械有限公司 | Thin-walled frame casting one casts the casting method having more |
| CN109837454A (en) * | 2019-04-08 | 2019-06-04 | 河北恒工机械装备科技有限公司 | A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof |
| CN116689710A (en) * | 2023-08-02 | 2023-09-05 | 山西华德冶铸有限公司 | Casting method of excavator rotating support |
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| CN109837454A (en) * | 2019-04-08 | 2019-06-04 | 河北恒工机械装备科技有限公司 | A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof |
| CN116689710A (en) * | 2023-08-02 | 2023-09-05 | 山西华德冶铸有限公司 | Casting method of excavator rotating support |
| CN116689710B (en) * | 2023-08-02 | 2023-10-13 | 山西华德冶铸有限公司 | Casting method of excavator rotating support |
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