CN103521716A - Casting method of high-quality ship medium-speed series diesel front end box body - Google Patents
Casting method of high-quality ship medium-speed series diesel front end box body Download PDFInfo
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- CN103521716A CN103521716A CN201310470375.XA CN201310470375A CN103521716A CN 103521716 A CN103521716 A CN 103521716A CN 201310470375 A CN201310470375 A CN 201310470375A CN 103521716 A CN103521716 A CN 103521716A
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Abstract
The invention relates to a mechanical casting process, relates to a casting method of a high-quality ship medium-speed series diesel front end box body, and is characterized in that the casting method comprises the following specific steps: (1) molding and preparing a core; (2) smelting original molten iron: adopting 65% of pig iron, 35% of scrap steel, an alloy and a recarburizing agent as raw materials, overheating for 5 min at a melting temperature of above 1500 DEG C, carrying out pure purification of the molten iron, and controlling the original molten iron chemical composition to have the following content by the weight percentage: 3.0-3.1% of C, 1.1-1.2% of Si, 0.9-1.1% of Mn, not more than 0.10% of P, not more than 0.10% of S, 0.6-0.8% of Cu, 0.2-0.3% of Cr, and the balance being Fe; (3) carrying out first inoculation treatment; (4) carrying out secondary inoculation; and (5) pouring: carrying out pouring and the secondary inoculation simultaneously with the pouring speed of 35-40 kg/s, controlling the pouring time of 90-100 s, adding the pouring time of not less than 3 min after iron appears at a riser, and designing a pouring system as a double-layer ladder type. The casting method solves the problems that a conventional ship diesel front end box body casting method has many product defects and low finished product rate, and is especially suitable for the casting of the medium-speed series diesel front end box body.
Description
Technical field
The present invention relates to machine casting process modification, especially a kind of casting method of high-quality ship use intermediate speed serial diesel engine front end casing.
Background technology
Front end casing is the most complicated foundry goods in middling speed serial diesel engine.Because its overall size is large, (the wide * of long * is high: 2150mm*1550mm*900mm), main wall thin (15mm), wall thickness differ greatly (thick large part reaches 150mm), inner-cavity structure is complicated (by upper, in, more than 30 core of lower three layers of total formed more than 10 oil pocket cavity and water cavity cavity), the test pressure of each cavity is 1.0MPa, there is very large casting difficulty, the problem that existing casting method exists is: in molding and core making, do not adopt preferably ventilative measure, original iron melt chemical analysis is C:3.2 ~ 3.5%, Si:1.6 ~ 1.8%, Mn:0.8 ~ 1.0%, P≤0.10%, S≤0.15%, surplus Fe, constituent structure is undesirable, inoculation for once, adopt the individual layer running channel design of top layer or bottom, consequently: front end casing cast product exists scab, cold shut, slag inclusion water burst, the number of drawbacks such as air pocket, cause poor product quality, qualification rate is low, only 60%.
Summary of the invention
Object of the present invention will solve conventional method casting ship use intermediate speed serial diesel engine front end casing exactly, and product defects is many, of poor quality, and the problem that qualification rate is low provides a kind of casting method of high-quality ship use intermediate speed serial diesel engine front end casing.
Concrete scheme of the present invention is: a kind of casting method of high-quality ship use intermediate speed serial diesel engine front end casing, is characterized in that: comprise following concrete steps: (1) molding and core making: outlet passageway is stayed in outside core head position, places breather cord bleed in the middle of all cores; In the middle of 1# top inner chamber core and square hole chamber, 15# bottom core, all add 12kg coke to improve the gas permeability of core; The special-purpose alcohol-base paint of " Fushi section " the ISOMOL type of use is in external form inwall and core outer wall brushing twice, and THICKNESS CONTROL is at 0.6-0.8mm; By external form and core mould assembling; (2) original iron melt melting: raw material is used pig iron 65%+ steel scrap 35%+ alloy+carburant, smelting temperature is at more than 1500 ℃ overheated 5min, with pure purifying molten iron, control original iron melt chemical component weight percentage is: C:3.0-3.1%, Si:1.1-1.2%, Mn:0.9-1.1%, P≤0.10%, S≤0.10%, Cu:0.6-0.8%, Cr:0.2-0.3%, surplus Fe; (3) an inoculation: tapping a blast furnace when stokehold original iron melt chemical composition reaches technological requirement, is that 20-30mm ferrosilicon adds with iron runner by granularity, and the joining day is the 80-90% of the time of tapping a blast furnace, and a time pregnant amount is 0.5%; Tapping temperature is controlled at 1480 ± 10 ℃; (4) late inoculation: when iron liquid is poured into a mould, use mould powder that granularity is 0.4-0.7mm to pack into and breed funnel, carry out with stream instant inoculation, pregnant amount is 0.08% of iron flow quantity; (5) cast: cast is carried out with late inoculation simultaneously, and poring rate 35-40kg/s, is controlled at 90-100s the duration of pouring, and after rising head is shown in iron, teeming is no less than 3min, and Design of Runner System is Double-ladder formula, band filtration system, guarantees iron liquid stable filling type, effectively feeding.
The formula of Double-ladder described in the present invention casting system, include main sprue and connected main cross gate, the two ends, left and right of main cross gate be connected with left and right on lautertuns, left and right upper lautertuns is connected with respectively a left and right upper minute cross gate again, is respectively provided with seven uniform rising heads on left and right on minute cross gate; At the left and right two ends of main cross gate, keep left, the inner side of upper right lautertuns is also connected with respectively left and right minute sprue, the lower end of two minutes sprues is respectively equipped with left and right lower lautertuns, left and right lower lautertuns connects respectively lower minute cross gate.
Left and right upper lautertuns described in the present invention and left and right lower lautertuns include sealing cell body, and the middle part of cell body is provided with screen pack.
In the present invention owing to having taked to place breather cord bleed in the middle of the core, and add coke in 1# and 5# core, greatly improved the gas permeability of core, and original iron melt chemical composition is improved, adopt late inoculation and Double-ladder formula cast filtration system simultaneously, the many kinds of measures such as preferred poring rate and the duration of pouring, greatly improved casting effect, the Marine Medium-speed Diesel Engine front end casing that adopts the inventive method to manufacture, stopped foundry goods scab, cold shut, slag inclusion, the casting flaws such as air pocket, product quality increases substantially, product percent of pass has reached more than 90%, to enterprise, brought huge economic benefit.
Accompanying drawing explanation
Fig. 1 is the three-dimensional front view of the running gate system in the present invention;
Fig. 2 is that the A of Fig. 1 is to running channel view;
Fig. 3 is core stereochemical structure view;
Fig. 4 is 1# top inner chamber core three-dimensional view;
Fig. 5 is the three-dimensional view in square hole chamber, 15# bottom.
In figure: 1-main sprue, 2-main cross gate, 3-upper left lautertuns, 4-lower-left lautertuns, cross gate is divided in 5-upper left, 6-rising head, cross gate is divided in 7-lower-left, and cross gate is divided in 8-upper right, 9-upper right lautertuns, 10-part sprue, 11-bottom right lautertuns, 12-screen pack on the right side, 13-part sprue on the left side, 14-core, 15-1# top inner chamber core, square hole chamber, 16-15# bottom core.
The specific embodiment
The casting method of manufacturing high-quality ship use intermediate speed serial diesel engine front end casing, comprises the following steps: (1) molding and core making: referring to Fig. 3,4,5, outlet passageway is stayed in outside core head position, in the middle of all cores 14, places breather cord bleeds; In the middle of 1# top inner chamber core 15 and square hole chamber, 15# bottom core 16, all add 12kg coke to improve the gas permeability of core; The special-purpose alcohol-base paint of " Fushi section " the ISOMOL type of use is in external form inwall and core outer wall brushing twice, and THICKNESS CONTROL is at 0.6-0.8mm; By external form and core mould assembling; (2) original iron melt melting: raw material is used pig iron 65%+ steel scrap 35%+ alloy+carburant, smelting temperature is at more than 1500 ℃ overheated 5min, with pure purifying molten iron, control original iron melt chemical component weight percentage is: C:3.0-3.1%, Si:1.1-1.2%, Mn:0.9-1.1%, P≤0.10%, S≤0.10%, Cu:0.6-0.8%, Cr:0.2-0.3%, surplus Fe; (3) an inoculation: tapping a blast furnace when stokehold original iron melt chemical composition reaches technological requirement, is that 20-30mm ferrosilicon adds with iron runner by granularity, and the joining day is the 80-90% of the time of tapping a blast furnace, and a time pregnant amount is 0.5%; Tapping temperature is controlled at 1480 ± 10 ℃; (4) late inoculation: when iron liquid is poured into a mould, use mould powder that granularity is 0.4-0.7mm to pack into and breed funnel, carry out with stream instant inoculation, pregnant amount is 0.08% of iron flow quantity; (5) cast: cast is carried out with late inoculation simultaneously, and poring rate 35-40kg/s, is controlled at 90-100s the duration of pouring, and after rising head is shown in iron, teeming is no less than 3min, and Design of Runner System is Double-ladder formula, band filtration system, guarantees iron liquid stable filling type, effectively feeding.
In above-mentioned steps of the present invention: described Double-ladder formula casting system, referring to Fig. 1,2, include main sprue 1 and connected main cross gate 2, the two ends, left and right of main cross gate 2 be connected with left and right on lautertuns 3 and 9, left and right upper lautertuns 3 and 9 is connected with respectively a left and right upper minute cross gate 5 and 8 again, is respectively provided with seven uniform rising heads 6 on left and right on minute cross gate 5 and 8; At the left and right two ends of main cross gate 2, keep left, upper right lautertuns 3 and 9 inner side are also connected with respectively left and right minute sprue 10 and 13, the lower end of two minutes sprues is respectively equipped with left and right lower lautertuns 4 and 11, and left and right lower lautertuns 4 is connected respectively lower minute cross gate 7 with 11.
In above-mentioned steps of the present invention: described left and right upper lautertuns 3 and 9 and left and right lower lautertuns 4 and 11 include sealing cell body, the middle part of cell body is provided with screen pack 12.
Claims (3)
1. a casting method for high-quality ship use intermediate speed serial diesel engine front end casing, is characterized in that: comprise following concrete steps: (1) molding and core making: outlet passageway is stayed in outside core head position, places breather cord bleed in the middle of all cores; In the middle of 1# top inner chamber core and square hole chamber, 15# bottom core, all add 12kg coke to improve the gas permeability of core; The special-purpose alcohol-base paint of " Fushi section " the ISOMOL type of use is in external form inwall and core outer wall brushing twice, and THICKNESS CONTROL is at 0.6-0.8mm; By external form and core mould assembling; (2) original iron melt melting: raw material is used pig iron 65%+ steel scrap 35%+ alloy+carburant, smelting temperature is at more than 1500 ℃ overheated 5min, and with pure purifying molten iron, control original iron melt chemical component weight percentage is: C:3.0
-3.1%, Si:1.1
-1.2%, Mn:0.9
-1.1%, P≤0.10%, S≤0.10%, Cu:0.6
-0.8%, Cr:0.2
-0.3%, surplus Fe; (3) an inoculation: tapping a blast furnace when stokehold original iron melt chemical composition reaches technological requirement, is that 20-30mm ferrosilicon adds with iron runner by granularity, and the joining day is the 80-90% of the time of tapping a blast furnace, and a time pregnant amount is 0.5%; Tapping temperature is controlled at 1480 ± 10 ℃; (4) late inoculation: when iron liquid is poured into a mould, use mould powder that granularity is 0.4-0.7mm to pack into and breed funnel, carry out with stream instant inoculation, pregnant amount is 0.08% of iron flow quantity; (5) cast: cast is carried out with late inoculation simultaneously, and poring rate 35-40kg/s, is controlled at 90-100s the duration of pouring, and after rising head is shown in iron, teeming is no less than 3min, and Design of Runner System is Double-ladder formula, band filtration system, guarantees iron liquid stable filling type, effectively feeding.
2. the casting method of a kind of high-quality ship use intermediate speed serial diesel engine front end casing according to claim 1, it is characterized in that: described Double-ladder formula casting system, include main sprue and connected main cross gate, the two ends, left and right of main cross gate be connected with left and right on lautertuns, left and right upper lautertuns is connected with respectively a left and right upper minute cross gate again, is respectively provided with seven uniform rising heads on left and right on minute cross gate; At the left and right two ends of main cross gate, keep left, the inner side of upper right lautertuns is also connected with respectively left and right minute sprue, the lower end of two minutes sprues is respectively equipped with left and right lower lautertuns, left and right lower lautertuns connects respectively lower minute cross gate.
3. the casting method of a kind of high-quality ship use intermediate speed serial diesel engine front end casing according to claim 2, is characterized in that: described left and right upper lautertuns and left and right lower lautertuns include sealing cell body, and the middle part of cell body is provided with screen pack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310470375.XA CN103521716B (en) | 2013-10-11 | 2013-10-11 | The casting method of a kind of high-quality ship use intermediate speed serial diesel engine front end casing |
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| CN201310470375.XA CN103521716B (en) | 2013-10-11 | 2013-10-11 | The casting method of a kind of high-quality ship use intermediate speed serial diesel engine front end casing |
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| CN103521716A true CN103521716A (en) | 2014-01-22 |
| CN103521716B CN103521716B (en) | 2015-09-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598377A (en) * | 2016-01-20 | 2016-05-25 | 烟台新潮铸造有限公司 | Casting method capable of eliminating air holes in machine tool casting |
| CN107745092A (en) * | 2017-10-13 | 2018-03-02 | 成都永益泵业股份有限公司 | A kind of production method of 2507 stainless steel pump casting |
| CN111299536A (en) * | 2020-03-10 | 2020-06-19 | 陕西柴油机重工有限公司 | Method for solving shrinkage porosity of axle hole in casting of large nodular cast iron machine body |
| CN113523193A (en) * | 2021-07-07 | 2021-10-22 | 上柴动力海安有限公司 | Lightweight crankcase casting pouring system and casting process thereof |
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| JP2003191068A (en) * | 2001-12-25 | 2003-07-08 | Aisin Takaoka Ltd | Cast iron part and its producing method |
| CN201482922U (en) * | 2009-08-05 | 2010-05-26 | 广西玉柴机器股份有限公司 | Structure for casting large-sized front end box of ship engine |
| DE102009058730A1 (en) * | 2009-12-17 | 2011-06-22 | Bayerische Motoren Werke Aktiengesellschaft, 80809 | Method for producing a casting |
| CN202129409U (en) * | 2011-05-31 | 2012-02-01 | 日月重工股份有限公司 | Pouring system |
| CN102806317A (en) * | 2012-08-13 | 2012-12-05 | 南车戚墅堰机车有限公司 | Casting method of locomotive diesel engine body |
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2013
- 2013-10-11 CN CN201310470375.XA patent/CN103521716B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003191068A (en) * | 2001-12-25 | 2003-07-08 | Aisin Takaoka Ltd | Cast iron part and its producing method |
| CN201482922U (en) * | 2009-08-05 | 2010-05-26 | 广西玉柴机器股份有限公司 | Structure for casting large-sized front end box of ship engine |
| DE102009058730A1 (en) * | 2009-12-17 | 2011-06-22 | Bayerische Motoren Werke Aktiengesellschaft, 80809 | Method for producing a casting |
| CN202129409U (en) * | 2011-05-31 | 2012-02-01 | 日月重工股份有限公司 | Pouring system |
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Non-Patent Citations (1)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598377A (en) * | 2016-01-20 | 2016-05-25 | 烟台新潮铸造有限公司 | Casting method capable of eliminating air holes in machine tool casting |
| CN107745092A (en) * | 2017-10-13 | 2018-03-02 | 成都永益泵业股份有限公司 | A kind of production method of 2507 stainless steel pump casting |
| CN107745092B (en) * | 2017-10-13 | 2019-06-18 | 成都永益泵业股份有限公司 | A kind of production method of 2507 stainless steel pump casting |
| CN111299536A (en) * | 2020-03-10 | 2020-06-19 | 陕西柴油机重工有限公司 | Method for solving shrinkage porosity of axle hole in casting of large nodular cast iron machine body |
| CN111299536B (en) * | 2020-03-10 | 2022-06-28 | 陕西柴油机重工有限公司 | Method for solving shrinkage porosity of wheel shaft in casting of large nodular cast iron machine body |
| CN113523193A (en) * | 2021-07-07 | 2021-10-22 | 上柴动力海安有限公司 | Lightweight crankcase casting pouring system and casting process thereof |
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| CN103521716B (en) | 2015-09-23 |
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