CN101444838A - Method for casting large jigger wheel with counterbalance - Google Patents
Method for casting large jigger wheel with counterbalance Download PDFInfo
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- CN101444838A CN101444838A CNA200810207375XA CN200810207375A CN101444838A CN 101444838 A CN101444838 A CN 101444838A CN A200810207375X A CNA200810207375X A CN A200810207375XA CN 200810207375 A CN200810207375 A CN 200810207375A CN 101444838 A CN101444838 A CN 101444838A
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- internal densener
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Abstract
The invention relates to a method for casting a large jigger wheel with a counterbalance. The method comprises the steps of manufacturing a mould, molding, assembling the mould, casting, cooling a mold, cleaning the mold and heat treatment, wherein, during the process of casting the mold, a parting surface is arranged on an upper plane of cast teeth; all cast teeth of the jigger wheel are arranged at a lower half sand mold; a self counterbalance of the jigger wheel is arranged at an upper half sand mold, and an inner chill is arranged in the counterbalance. The method can effectively prevent the occurrence of shrinkage cavity at the position of the counterbalance of a large cast teeth jigger wheel and improve the material compactness of a cast under the condition of ensuing the quality of the cast teeth. For a large thick jigger wheel of a large diesel engine, the method can reduce the workload for cleaning and polishing the cast, save a great deal of machining workload, improve the production efficiency and reduce the production cost.
Description
Technical field
The present invention relates to forming materials, be specifically related to the forging type of the large jigger wheel used on a kind of diesel engine, have balance weight on this kind jigger wheel, adopt a kind of method that balance weight and jigger wheel are cast out together, prevent from casting process that it from carrying to produce casting flaw on the balance weight.
Background technology
Jigger wheel is circular thick big of a large-scale band tooth in the marine low speed diesel engine, and its major function is the diesel engine starting jiggering.Foundry goods size ￠ 2500-3500mm, thickness 200-900mm, weight 15-25 ton.The primary structure of jigger wheel is shown in a among Fig. 1 and b two width of cloth figure, and Fig. 1 a is the structure schematic top plan view that has the jigger wheel of balance weight on the marine diesel, and Fig. 1 b is the structure schematic side view that has the jigger wheel of balance weight on the marine diesel.As seen from the figure, the jigger wheel profile on this marine diesel is disc, is made up of concentric cylindrical and interior circle.Wherein, the casting tooth is positioned at the edge of cylindrical, on cylindrical, be provided with two manholes, line is crossed the center of circle of jigger wheel between two circular hole centers of circle, balance weight is between cylindrical and interior circle, two balance weight symmetries are listed in the both sides of line between the center of circle of above-mentioned two circular holes, are similar to lung's structure distribution of human body.
In the prior art, the jigger wheel production method that has thick especially big balance weight is: thick big balance weight casts the processing of parallel operation tool separately, fits together with jigger wheel then.Because large jigger wheel is high to the quality requirement of casting tooth, casting flaw such as have cinder hole, sand hole, pore on the casting tooth surface after not allowing to process, be mingled with.According to technical specification, this casting material is EN-GJL-HB255 (HT350), the attached casting sample of jigger wheel disjunctor, it directly is put on the crown on the jigger wheel, water out with foundry goods, when treating casting cleaning, sample taken off test, its performance: tensile strength is greater than 260N/mm2, and Brinell hardness is greater than 185HB; Jigger wheel body flank Brinell hardness 〉=185HB; Chemical composition nominal value C:3.05%, Si:1.5%, Mn:0.9%, P≤0.15%, S≤0.10%, Cu:1.3%.
The above-mentioned casting method that has the jigger wheel foundry goods of thick especially big balance weight is that thick big balance weight and jigger wheel are cast respectively, processed, and fits together at last.The machine-finish allowance of the method is big, the processing cost height, and the production cycle is long, and operation link is many, and is very loaded down with trivial details.If thick big balance weight is cast out with jigger wheel, because of wall thickness differs very greatly different, the balance weight position often produces casting flaws such as shrinkage cavity, uses big rising head that feeding is carried out at the balance weight position, and shrinkage cavity is big more, and the casting difficulty is very big.
Summary of the invention
The objective of the invention is to overcome the deficiency on the above-mentioned prior art, provide a kind of Big Steel Castings tooth part in casting process, to prevent to carry the method that balance weight produces casting flaw.Utilize method of the present invention effectively to prevent to carry the balance weight position and produce shrinkage cavity defect, improve foundry goods compactness, simultaneously easy to operate, reduce operation, raise the efficiency, reduce cost.
In order to realize the foregoing invention purpose, the technical scheme that the present invention proposes is as follows:
A kind of casting method that has the large jigger wheel of balance weight, the profile of this jigger wheel is a disc, form by cylindrical and interior circle, wherein cast the edge that tooth is positioned at cylindrical, on cylindrical, also be provided with two circular holes, line is crossed the center of circle of jigger wheel between the center of circle of two circular holes, balance weight is two parts, all between cylindrical and interior circle, and symmetry is listed in the both sides of line between two circular hole centers of circle, the method of casting above-mentioned jigger wheel comprises makes up casting technique, making mould, moulding, mould assembling, cast, casting mold cooling, casting cleaning and heat treatment, and its detailed step is:
1. die joint is positioned at the last plane of the jigger wheel that has balance weight in the casting technique, described casting tooth is arranged in second sand mold, balance weight is arranged in first sand mold, place internal densener in the balance weight, described running gate system is the bottom gating that has screen pack and slag trap, wherein sprue is on the circle central axis of foundry goods, cross gate is the donut that is positioned at the jigger wheel bottom, between sprue and cross gate a plurality of minutes cross gates of radial setting, in minute cross gate, be provided with slag trap and screen pack, connect the ingate that drenches with rain that is of cross gate and foundry goods die cavity, riser runner is arranged at the highest position of jigger wheel;
2. make external mold, core box, and according to the size design internal densener and the stud of balance weight, internal densener roughly is the lung shape, be arranged at the inside of balance weight cavity, described stud is cylindrical, be provided with groove along axis in the centre of stud, described stud is divided into two kinds according to purposes, a kind of setting supported internal densener and internal densener, another kind is arranged between internal densener and the external mold, the internal densener that is arranged in the balance weight is two that be arranged in parallel, between internal densener and the internal densener, be provided with described stud between internal densener and the external mold;
3. moulding, coremaking;
4. join the case mould assembling, the preheating casting mold;
5. smelting and pouring, foundry goods slowly cooling in casting mold behind the casting complete;
6. clear up foundry goods, stress-relieving by beat treatment.
In the 1. described running gate system of step, the area ratio of the cross section of sprue, cross gate, ingate is 1:4:2.
The 2. described internal densener Edge Distance of step balance weight profile is of a size of 100～120mm, interior cold thickness is 80～100mm, two diameters are arranged is 100～200 perforation circular hole up and down in design on interior cold, and the gross weight of described internal densener is 1/4～1/3 of a balance weight gross weight.
Furan resin self curing sand is all adopted in 3. middle moulding of described step and coremaking.
Intermediate frequency furnace is adopted in the 5. middle melting of described step, the weight percent proportioning of furnace charge is: the new pig iron 20%, steel scrap 40%, foundry returns 40%, high melting temperature is 1500～1520 ℃, and breeding temperature is 1360～1420 ℃, and inovulant is 75FeSi, addition accounts for 0.4% of furnace charge gross weight, and the temperature of cast is 1300～1330 ℃.
Described step 5. in cool time of casting mold be 6 days.
Because adopt technique scheme, the present invention has following technological merit than prior art:
Do not produce a kind of casting method of shrinkage cavity as the balance weight position that makes large jigger wheel, the present invention places thick big balance weight position with internal densener, balance wall thickness poor, reduced the feeding a casting demand, thereby obtained sound casting.Adopt method of the present invention, simple to operate, labour intensity reduces, and production efficiency improves, and effectively eliminates the shrinkage cavity on the balance weight, simultaneously, the jigger wheel preparation method that has thick big balance weight with fitting together after original casting, the machining respectively becomes the disjunctor casting, has significantly reduced the machined workload, enhance productivity, reduce production costs.
Description of drawings
Fig. 1 a is the structure schematic top plan view that has the jigger wheel of balance weight on the marine diesel.
Fig. 1 b is the structure schematic side view that has the jigger wheel of balance weight on the marine diesel.
Fig. 2 a is the design schematic side view of running gate system in the casting method of a kind of large jigger wheel that has a balance weight of the present invention.
Fig. 2 b is the design schematic top plan view of running gate system in the casting method of a kind of large jigger wheel that has a balance weight of the present invention.
Fig. 3 a is the placement schematic top plan view of internal densener in the casting method of a kind of large jigger wheel that has a balance weight of the present invention, stud.
Fig. 3 b is the placement schematic side view of internal densener in the casting method of a kind of large jigger wheel that has a balance weight of the present invention, stud.
Wherein,
1-balance weight, 2-circular hole, 3-sprue, 4-cross gate
5-minute cross gate 6-screen pack 7-slag trap 8-ingate drenches with rain
9-stud A-balance weight external mold B-internal densener
The specific embodiment
Come a kind of casting method that has the large jigger wheel of balance weight of the present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment, but can not limit protection scope of the present invention with this.
The profile of the jigger wheel of using on the marine low speed diesel engine is a disc, is made up of cylindrical and interior circle on the card.Wherein the casting tooth of jigger wheel is distributed in the circumferential edges of cylindrical, need cast out with jigger wheel.Balance weight 1 on the jigger wheel is in a side of jigger wheel, and between cylindrical and interior circle, and symmetry is listed in the both sides of line between two circular hole 2 centers of circle.The circle center line connecting that has the through hole of two circles to be 2, two through holes of circular hole on jigger wheel is crossed the center of circle of jigger wheel.Two balance weight 1 profiles are fan-shaped, are symmetrically distributed in the both sides of through hole line.Its primary structure as shown in Figure 1, Fig. 1 a is the structure schematic top plan view that has the jigger wheel of balance weight on the marine diesel, Fig. 1 b is the structure schematic side view that has the jigger wheel of balance weight on the marine diesel.Wherein left side figure is a vertical view, and right figure is the sectional view along left figure arrow.Method of the present invention changes balance weight and jigger wheel split casting in the past exactly, and the way that is fixed together then together casts out with balance weight and jigger wheel, and casting flaws such as elimination so issuable shrinkage cavity.
The wall thickness of foundry goods is thick more, is easy to generate casting flaws such as shrinkage cavity in casting process.In order to make the balance weight on the jigger wheel not produce shrinkage cavity defect, be provided with internal densener at thick especially big balance weight position in the method for the present invention, the size of internal densener can also design by piecemeal, and be supported in the casting mold with stud according to the design of balance weight size conformal.Internal densener adopts with the liquation cast of the identical proportioning of jigger wheel and forms, and uses through after shot-peening, polishing and the oven dry.
When foundry goods begins to cast, need at first to work out casting technique: establish die joint, designing mould and design running gate system according to the size and the shape of the jigger wheel that has balance weight.
For model is the marine diesel of RT-flex60C, and the parameter of its jigger wheel is as follows: casting tooth tip diameter is 2630mm, and transverse tooth thickness is 150mm, main wall thickness 476mm, the overall thick 920mm in balance weight position.
1) press horizontal parting method establishment jigger wheel casting technique, jigger wheel casting tooth in second sand mold, is a die joint with plane on the jigger wheel casting tooth all.
Before the jigger wheel of the above-mentioned model of casting, need the establishment casting technique: die joint is positioned at the last plane of the jigger wheel that has balance weight, described casting tooth is arranged in second sand mold, balance weight 1 is arranged in first sand mold, place internal densener in the balance weight 1, described running gate system is the bottom gating that has screen pack 6 and slag trap 7, wherein sprue 3 is on the circle central axis of foundry goods, cross gate 4 is the donuts that are positioned at the jigger wheel bottom, between sprue 3 and cross gate 4 a plurality of minutes cross gates 5 of radial setting, in minute cross gate 5, be provided with slag trap 7 and screen pack 6, connect the ingate 8 that drenches with rain that is of cross gate 4 and foundry goods die cavity, riser runner is arranged at the highest position of jigger wheel.As shown in Figure 2, Fig. 2 a is the design schematic side view of running gate system in the casting method of a kind of large jigger wheel that has a balance weight of the present invention, and Fig. 2 b is the design schematic top plan view of running gate system in the casting method of a kind of large jigger wheel that has a balance weight of the present invention.
2) carry out internal densener and stud design according to the size of jigger wheel balance weight.
According to the size design internal densener B and the stud of balance weight 1, internal densener B roughly is the lung shape, and shown in Fig. 3 a, Fig. 3 a is the placement schematic top plan view of internal densener in the casting method of a kind of large jigger wheel that has a balance weight of the present invention, stud.Above-mentioned internal densener B is arranged at the inside of balance weight cavity, described stud 9 is cylindrical, be provided with groove along axis in the centre of stud 9, described stud 9 is divided into two kinds according to purposes, a kind of setting is used for supporting internal densener and internal densener, another kind is arranged between internal densener B and the balance weight external mold A, and the internal densener that is arranged in each balance weight 1 is two that be arranged in parallel, between internal densener and the internal densener, be provided with described stud 9 between internal densener and the external mold.
When internal densener is positioned in the sand mold, internal densener Edge Distance balance weight profile is of a size of 100～120mm, interior cold thickness is 80～100mm, the design perforation that two diameters are arranged is 100～200mm circular hole up and down on interior cold, the gross weight of described internal densener is 1/4～1/3 of a balance weight gross weight.The placement of above-mentioned internal densener and stud is shown in Fig. 3 b, and Fig. 3 b is the placement schematic side view of internal densener in the casting method of a kind of large jigger wheel that has a balance weight of the present invention, stud.
3) make external mold, core box by the requirement of casting technique drawing.
4) adopt furan resin self curing sand moulding, coremaking.Descend to cast tooth mud core in order, following good jigger wheel centre bore mud core, after the balance weight position is put internal densener and stud well, loose sand, dust stratification in the exhaustion die cavity, mould assembling;
5), carry out the preceding preparation of cast with cast form hot air preheating casting mold.
6) smelting and pouring.Charge composition: new pig iron 20%+ steel scrap 40%+ foundry returns 40%, adopt intermediate frequency furnace to carry out melting, high melting temperature is 1500-1520 ℃, breeding temperature is 1360-1420 ℃, inovulant is 75FeSi, the addition of inovulant accounts for 0.4% of furnace charge gross weight, and pouring temperature is 1300-1330 ℃;
7) slowly cooling is unpacking after 6 days in casting mold for cast back foundry goods;
8) cast gate, rising head, fash are removed in casting cleaning;
9) foundry goods carries out conventional heat treatment, eliminates stress;
Adopt the jigger wheel of method casting of the present invention, can prevent effectively that the balance weight position from producing shrinkage cavity defect, obtains fine and close part.
Claims (6)
1. casting method that has the large jigger wheel of balance weight, the profile of this jigger wheel is a disc, form by cylindrical and interior circle, wherein cast the edge that tooth is positioned at cylindrical, on cylindrical, also be provided with two circular holes, line is crossed the center of circle of jigger wheel between the center of circle of two circular holes, balance weight is two parts, all between cylindrical and interior circle, and symmetry is listed in the both sides of line between two circular hole centers of circle, the method of casting above-mentioned jigger wheel comprises makes up casting technique, make mould, moulding, mould assembling, cast, the casting mold cooling, casting cleaning and heat treatment is characterized in that, its detailed step is:
1. die joint is positioned at the last plane of the jigger wheel that has balance weight in the casting technique, described casting tooth is arranged in second sand mold, balance weight is arranged in first sand mold, place internal densener in the balance weight, described running gate system is a bottom gating, wherein sprue is on the circle central axis of foundry goods, cross gate is the donut that is positioned at the jigger wheel bottom, between sprue and cross gate a plurality of minutes cross gates of radial setting, in minute cross gate, be provided with slag trap and screen pack, connect the ingate that drenches with rain that is of cross gate and foundry goods die cavity, riser runner is arranged at the highest position of jigger wheel;
2. make external mold, core box, and according to the size design internal densener and the stud of balance weight, internal densener is the lung shape, be arranged at the inside of balance weight cavity, described stud is cylindrical, be provided with groove along axis in the centre of stud, described stud is divided into two kinds according to purposes, a kind of being supported between internal densener and the internal densener, another kind is supported between internal densener and the external mold, the internal densener that is arranged in each balance weight is two that be arranged in parallel, between internal densener and the internal densener, be provided with described stud between internal densener and the external mold;
3. moulding, coremaking;
4. join case, mould assembling, the preheating casting mold;
5. smelting and pouring, foundry goods slowly cooling in casting mold behind the casting complete;
6. clear up foundry goods, stress-relieving by beat treatment.
2. a kind of casting method that has the large jigger wheel of balance weight according to claim 1 is characterized in that, in the 1. described running gate system of step, the area ratio of the cross section of sprue, cross gate, ingate is 1:4:2.
3. a kind of casting method that has the large jigger wheel of balance weight according to claim 1, it is characterized in that, the 2. described internal densener Edge Distance of step balance weight profile is of a size of 100～120mm, interior cold thickness is 80～100mm, the design perforation that two diameters are arranged is 100～200mm circular hole up and down on interior cold, the gross weight of described internal densener is 1/4～1/3 of a balance weight gross weight.
4. a kind of casting method that has the large jigger wheel of balance weight according to claim 1 is characterized in that, furan resin self curing sand is all adopted in 3. middle moulding of described step and coremaking.
5. a kind of casting method that has the large jigger wheel of balance weight according to claim 1, it is characterized in that, intermediate frequency furnace is adopted in the 5. middle melting of described step, and the weight percent proportioning of furnace charge is: the new pig iron 20%, steel scrap 40%, foundry returns 40%, high melting temperature is 1500～1520 ℃, and breeding temperature is 1360～1420 ℃, and inovulant is 75FeSi, addition accounts for 0.4% of furnace charge gross weight, and the temperature of cast is 1300～1330 ℃.
6. a kind of according to claim 1 or 5 casting method that has the large jigger wheel of balance weight is characterized in that, described step 5. in cool time of casting mold be 6 days.
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| CN101912949A (en) * | 2010-05-24 | 2010-12-15 | 河南省汤阴县华兴机械制造有限公司 | Heavy wheel cast bottom mold making core supporting disc, device and process |
| CN102672112A (en) * | 2012-04-28 | 2012-09-19 | 浙江坤博机械制造有限公司 | Casting method of motor casing |
| CN103157767A (en) * | 2013-01-31 | 2013-06-19 | 洛阳新火种节能技术推广有限公司 | Method for improving finished product rate of saloon car power-assisted steering pump cases |
| CN104722708A (en) * | 2015-03-30 | 2015-06-24 | 共享铸钢有限公司 | Modeling method and sand mold structure of sector-shaped end cover type casting for large-size mill |
| CN106424554A (en) * | 2015-08-06 | 2017-02-22 | 江苏鼎泰工程材料有限公司 | Shaft-mounted braking disc production method and shaft-mounted braking disc prepared by using shaft-mounted braking disc production method |
| CN107309401A (en) * | 2017-08-01 | 2017-11-03 | 安徽安庆市沙氏汽车配件有限公司 | A kind of shaped device for automobile counterbalance |
| CN109317634A (en) * | 2018-03-23 | 2019-02-12 | 上海宏钢电站设备铸锻有限公司 | A kind of method of the recycling of ironcasting chill |
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Address after: 200129 346, 2851 Pudong Avenue, Shanghai, Pudong New Area Patentee after: HUDONG HEAVY MACHINERY Co.,Ltd. Patentee after: China Shipbuilding marine power components Co., Ltd Address before: 200129 346, 2851 Pudong Avenue, Shanghai, Pudong New Area Patentee before: HUDONG HEAVY MACHINERY Co.,Ltd. Patentee before: Shanghai Hulin Heavy Industry Co., Ltd |
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