CN103639368B - The casting method of large-scale electric drive propeller for vessels bracket casting - Google Patents
The casting method of large-scale electric drive propeller for vessels bracket casting Download PDFInfo
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Abstract
The casting method of large-scale electric drive propeller for vessels bracket casting provided by the invention, comprises the following steps: 1) Making mold; 2) core manufacture; 3) running channel is arranged; 4) sandbox is arranged; 5) moulding by casting; Casting die manufactures and core mold manufacture, and two moulds all adopt split manufacture, and are divided into polylith monomer to make separately on respective mould according to the profile of foundry goods and core respectively; The casting die monomer made first is assemblied to form complete mould by glue gummed, then the mould assembled is fixed on template, the vestige atomized ash produced in die manufacture is filled, after dry, polishing is to level and smooth, the pore occurred is filled again to the making of casting die of having polished after polishing; Same process is adopted to manufacture core mold; Can reach and double as screw fixed platform and power transfer corridors, screw maintenance service passage, cast outer surface the quality requirement that rudder for ship is changed the direction of a stream of water.
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 formulates more and more stricter standard in 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.Develop polytype electric propulsion system abroad, and applied on many types of boats and ships.The research of China in this field is then at the early-stage.
Compared 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, flexible layout, 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 all the time in the work of best effort district, and oil inflame quality is good, and the amount of nitrogen oxides in combustion product is few, decreases toxic emission, and make air in cabin fresh, environmental quality improves.
Propeller bracket is the critical component being used in boats and ships and ocean macrotype platform electrically-actuated device, and as screw fixed platform and power transfer corridors, 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 the traveling of whole boats and ships and ocean macrotype platform and fix, and the critical process casting this series products guarantees 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 property requirements is high, production exists the casting difficulty of professional.Particularly casting section thickness differs greatly, and contour structures is irregular, and all with arc surface transition, inner-cavity structure is complicated, and after molten iron pours into casting mold, length three directions 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 providing a kind of large-scale electric drive propeller for vessels bracket casting, meet in foundry goods and there is no the defect such as shrinkage cavity and porosity, slag inclusion, can reach and double as screw fixed platform and power transfer corridors, screw maintenance service passage, cast outer surface 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) Making mold; 2) core manufacture; 3) running channel is arranged; 4) sandbox is arranged; 5) moulding by casting;
Described step 1) Making mold comprises: casting die manufacture and core mold manufacture, and two moulds all adopt split manufacture, and are divided into polylith monomer to make separately on respective mould according to the profile of foundry goods and core respectively; The casting die monomer made first is assemblied to form complete mould by glue gummed, then the mould assembled is fixed on template, the vestige atomized ash produced in die manufacture is filled, after dry, polishing is to level and smooth, the pore occurred is filled again to the making of casting die of having polished after polishing; Same process is adopted to manufacture core mold;
Described step 2) core manufacture, use step 1) in monomer core mold manufacture independently monomer core, then become by each monomer assembly of sand core core overall; Wherein, in core, arrange steel pipe and steel plate is used for strengthening the intensity of core when making core, sand core strength controls: 0.9 ~ 1.0MPa;
Described step 3) during running channel arranges, complete the setting of running gate system when manufacturing external form molding sand, external form sand bond controls: 1.3 ~ 1.4MPa; Wherein, running gate system comprises sprue, cross gate, ingate, rising head, system of giving vent to anger and die cavity, the ingate of rectangular flat is set at rectangular flat die cavity place and is communicated with die cavity, the ingate of rectangular flat is arranged again bending to cushion potting syrup, between half-spherical cavity structure die cavity place and cross gate, arrange the transition running channel of annular, transition running channel is communicated with half-spherical cavity structure die cavity by equally distributed multiple ingate 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 and fix some required component placement for chill, core, put after sand terminates, again banding is carried out to sandbox with bolt sandbox is outer;
Described step 5) cast time to potting syrup component and potting syrup temperature requirement as follows: 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 DEG C ~ 1350 DEG C;
Inovulant divides secondary to add, and once breeds: when tapping a blast furnace, pregnant amount is 0.6% ~ 0.7%; Late inoculation: quantitatively in bag, pregnant amount is 0.2% ~ 0.3%.
Described step 5) in nodulizer be light rare earth magnesium alloy.
Described step 5) once breed for barium silicon inoculant, late inoculation is special square inovulant.Once breed: silicon titanate particle is 3-8mm; Late inoculation: be of a size of 90*60*60mm, composition is Si72 ± 1%, Al≤1.2%, S≤0.02%, Ca1.0 ± 0.3%, Ba2 ± 0.4%.
Described step 5) in nodulizer be light rare earth magnesium alloy.
Described step 5) once breed for barium silicon inoculant, late inoculation is special square inovulant, wherein, when once breeding: silicon titanate particle is 3-8mm; Late inoculation: inovulant is of a size of 90*60*60mm, 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 present invention's large-scale electric drive propeller for vessels bracket casting has following advantage:
In view of the concrete structure of core, split production is beneficial to the precision ensureing each position, can carry out arranging steel pipe and steel plate structure according to the concrete structure at each position again, at long flat place, just then cannot ensure enough supports with steel pipe, core will be out of shape, be used alone the diameter of steel pipe then due to steel pipe larger, long flat structure cannot hold more steel pipe, therefore, in the structure that long flat structure place uses steel pipe and steel plate to combine, the structural strength of core can be ensured, core is avoided to be out of shape because of reasons in structure, this step is the important measures ensureing sand core strength, under the prerequisite ensureing sand core strength, the integral manufacturing of core is completed again by improving splicing accuracy, could support qualified core like this, avoid in use being out of shape, and according to the design feature of foundry goods, potting syrup is solved when pouring into a mould to the impact of die cavity by the running channel of elongate configuration, be particularly suitable for using in the die cavity with elongate configuration, potting syrup has higher buffering effect in the connection running channel of elongate configuration, make potting syrup can enter into die cavity very stably, effectively avoid the impact to die cavity, avoid the appearance occurring the defects such as burning into sand, and invention also improves the uniformity of potting syrup composition, ensure that the quality of potting syrup.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
The casting method of the present invention's large-scale electric drive propeller for vessels bracket casting, comprises the following steps: 1) Making mold; 2) core manufacture; 3) running channel is arranged; 4) sandbox is arranged; 5) moulding by casting;
Wherein, described step 1) Making mold comprises: casting die manufacture and core mold manufacture, and two moulds all adopt split manufacture, and are divided into polylith monomer to make separately on respective mould according to the profile of foundry goods and core respectively; The casting die monomer made first is assemblied to form complete mould by glue gummed, then the mould assembled is fixed on template, firm, durable for ensureing the overall structure of assembling die, require as follows to somatotype, point block part and combination: 1) the making material of each somatotype block faying face must be inside and outside consistent, must be closely knit seamless between faying face; 2) somatotype block ingredient need by mould number of unmolulding directions must rift grain spell system, select during ingredient white glue paste after with run through by nail material 1/3 flooring nail reinforce, flooring nail reinforce in length and breadth spacing at about 150mm; 3) the machined surface inwall dead size of each point of block part ensures at more than 150mm, and sets off with 100 × 40mm lining gear, and lining gear spacing is at about 300mm; 4) ingredient block can not occur when machining lacking material, delamination.The vestige atomized ash produced in casting die manufacture process is filled, and after dry, polishing is to level and smooth, the pore occurred is filled again to the making of casting die of having polished after polishing; Adopt same process to manufacture core mold, namely core mold also will carry out filling polishing.
Described step 2) in core split production, use step 1) in monomer core mold manufacture independently monomer core, then become by each monomer assembly of sand core core overall; Wherein, in core, arrange steel pipe and steel plate is used for strengthening the intensity of core when making core, sand core strength controls: 0.9 ~ 1.0MPa; Integral sand core size is large, vertical direction is located without core, locate by horizontal direction two, place in core centre special arbor to ensure that core does not rupture, indeformable, and core is located not brigadier and is caused whole casting section thickness to offset, by arranging drag hook and core, sandbox outer wall Dual positioning in core, guarantee each core accurate positioning.
Described step 3) in complete the setting of running gate system when manufacturing external form molding sand and manufacturing, external form sand bond controls: 1.3 ~ 1.4MPa; Wherein, running gate system comprises sprue, cross gate, ingate, rising head, system of giving vent to anger and die cavity, the ingate of rectangular flat is set at rectangular flat die cavity place and is communicated with die cavity, the ingate of rectangular flat is arranged again bending to cushion potting syrup, between half-spherical cavity structure die cavity place and cross gate, arrange the transition running channel of annular, transition running channel is communicated with half-spherical cavity structure die cavity by equally distributed multiple ingate again; Because foundry goods profile is irregular, running gate system position is difficult to determine, should moulding facilitate, and ensures that molten iron steadily can enter die cavity again.Adopt and horizontally do perpendicular cast direction of watering, 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, ensure 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 and fix some required component placement for chill, core, put after sand terminates, again banding is carried out to sandbox with bolt sandbox is outer; 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, after molten iron pours into casting mold, the length produced three directions are shunk inconsistent, can produce very large stress, cause casting deformation.By reinforcing outside core, controlling suitable intensity, making foundry goods have enough release stress-spaces, reaching foundry goods variable in effective range.
Described step 5) cast time to potting syrup component, potting syrup temperature and the duration of pouring requiring as follows:
Embodiment 1:
Potting syrup chemical constituent is: phosphorus content 3.70%, silicon content 2.50%, manganese content 0.18%, phosphorus content 0.02%, sulfur content 0.0085%, and surplus is iron;
Pouring temperature is 1335 DEG C, and the duration of pouring is 60s;
Nodulizer addition is 1.18%, and inovulant divides secondary to add, and once breeds: when tapping a blast furnace, pregnant amount is 0.7%; Late inoculation: quantitatively in bag, pregnant amount is 0.2%, wherein, when 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%, and surplus is iron.
Embodiment 2:
Potting syrup chemical constituent is: phosphorus content 3.68%, silicon content 2.45%, manganese content 0.25%, phosphorus content 0.026%, sulfur content 0.0067%, and surplus is iron;
Pouring temperature is 1343 DEG C, and the duration of pouring is 56s;
Nodulizer addition is 1.15%, and inovulant divides secondary to add, and once breeds: when 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 embodiments, step 5) in nodulizer be light rare earth magnesium alloy.
Described step 5) once breed for barium silicon inoculant, late inoculation is special square inovulant.Once breed: silicon titanate particle is 3-8mm; Late inoculation: be of a size of 90*60*60mm, composition is Si72 ± 1%, Al≤1.2%, S≤0.02%, Ca1.0 ± 0.3%, Ba2 ± 0.4%, wherein, when 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%, and 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) Making mold; 2) core manufacture; 3) running channel is arranged; 4) sandbox is arranged; 5) moulding by casting;
Described step 1) Making mold comprises: casting die manufacture and core mold manufacture, and two moulds all adopt split manufacture, and are divided into polylith monomer to make separately on respective mould according to the profile of foundry goods and core respectively; The casting die monomer made first is assemblied to form complete mould by glue gummed, then the mould assembled is fixed on template, the vestige atomized ash produced in die manufacture is filled, after dry, polishing is to level and smooth, the pore occurred is filled again to the making of casting die of having polished after polishing; Same process is adopted to manufacture core mold;
Described step 2) core manufacture, use step 1) in monomer core mold manufacture independently monomer core, then become by each monomer assembly of sand core core overall; Wherein, in core, arrange steel pipe and steel plate is used for strengthening the intensity of core when making core, sand core strength controls: 0.9 ~ 1.0MPa;
Described step 3) during running channel arranges, complete the setting of running gate system when manufacturing external form molding sand and manufacturing, external form sand bond controls: 1.3 ~ 1.4MPa; Wherein, running gate system comprises sprue, cross gate, ingate, rising head, system of giving vent to anger and die cavity, the ingate of rectangular flat is set at rectangular flat die cavity place and is communicated with die cavity, the ingate of rectangular flat is arranged again bending to cushion casting liquid, between half-spherical cavity structure die cavity place and cross gate, arrange the transition running channel of annular, transition running channel is communicated with half-spherical cavity structure die cavity by equally distributed multiple ingate 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 and fix some required component placement for chill, core, put after sand terminates, again banding is carried out to sandbox with bolt sandbox is outer;
Described step 5) moulding by casting, during cast to potting syrup component and potting syrup temperature requirement as follows: 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 DEG C ~ 1350 DEG C;
Inovulant divides secondary to add, and once breeds: when 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: described step 5) in nodulizer be 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 breed for barium silicon inoculant, late inoculation is special square inovulant, wherein, when once breeding: silicon titanate particle is 3-8mm; Late inoculation: inovulant is of a size of 90*60*60mm, 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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| CN103878314B (en) * | 2014-03-27 | 2016-05-04 | 舟山市定海区龙叶螺旋桨制造有限公司 | Screw pouring technology |
| CN104384442B (en) * | 2014-11-07 | 2016-08-24 | 甘肃酒钢集团西部重工股份有限公司 | A kind of preparation method of calcium carbide pot |
| 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 |
| CN106513589B (en) * | 2016-12-31 | 2018-01-05 | 马鞍山市海天重工科技发展有限公司 | A kind of manufacture method of half bend pipe |
| CN106513582B (en) * | 2016-12-31 | 2018-01-12 | 马鞍山市海天重工科技发展有限公司 | A kind of running gate system of half bend pipe |
| 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 |
| 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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