CN1709614A - Marine large-diameter cylinder liner casting method - Google Patents
Marine large-diameter cylinder liner casting method Download PDFInfo
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- CN1709614A CN1709614A CN 200510027454 CN200510027454A CN1709614A CN 1709614 A CN1709614 A CN 1709614A CN 200510027454 CN200510027454 CN 200510027454 CN 200510027454 A CN200510027454 A CN 200510027454A CN 1709614 A CN1709614 A CN 1709614A
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Abstract
This present invention relates to the method of casting vat sheath which is used by ship. It comprises the steps of making core, closing, melting, taphole, casting, cast clearing, cast gruff processing, anneal, detecting. Its character is that there is an irrigating core on the casting model, on which fix a seat which has taphole which is tucked. The melting comprises the steps of putting the abandoned steel 38-42wt%, neonatal iron 20-40wt%, returned charging 20-40wt% into furnace. The highest melting temperature is 1500-1520Deg.c. The time of heat preservation is 5-10 min. Lower to feasible temperature. This present invention has the virtues of uncomplicated method and enough material supply.
Description
Technical field
The present invention relates to marine diesel, particularly a kind of castmethod of marine large-diameter cylinder liner.
Background technology
Marine large-diameter cylinder liner is a kind of tube shape component, its section thick big (200mm), and diameter of bore is big (as Φ 800mm, Φ 900mm, Φ 980mm etc.), and part length 2640mm is divided into high pressure area, middle nip, low pressure area three parts.Cylinder sleeve is one of strength member that constitutes the diesel combustion chamber, and working conditions is very severe, when its bore surface bears the effect of high-temperature high-pressure combustion gases, also to bear and piston ring between sliding friction, outside surface will stand cooling.Wherein abominable with the condition of high pressure area.For big cylinder-diameter diesel engine III class cylinder sleeve, difficulty height especially, position, high pressure area foundry goods is thick to be reached more than the 200mm, and the material bulk properties requires tensile strength sigma b 〉=245N/mm
2, unit elongation σ s 〉=0.3%, hardness HB180～230, metallographic fine pearlite, 1A3/4, cementite+hard phase 3～7%, ferrite＜1%.It is an important problem that the high-power diesel engine cylinder sleeve peculiar to vessel that us are cast satisfies above-mentioned requirements.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of castmethod of marine large-diameter cylinder liner, so that our cylinder sleeve foundry goods satisfies the requirement of above-mentioned marine large-diameter diesel engine, i.e. the tensile strength sigma b of material body 〉=245N/mm
2, unit elongation σ s 〉=0.3%, hardness HB180～230, metallographic fine pearlite, 1A3/4, cementite+hard phase 3～7%, ferrite＜1%.
Technical solution of the present invention is as follows:
A kind of castmethod of large power diesel engine cylinder jacket peculiar to vessel, its step comprises molding and core making, mould assembling, furnace charge, melting is bred and is tapped a blast furnace, cast, casting finish, foundry goods roughing, stress annealing, sample testing is characterized in that:
Described molding and core making is to make wooden model and core box by the casting Technology Design requirement, wooden model is positioned on the template, adopt furan resin self curing sand between sandbox 2 and wooden model, to make casting mold 1, in the high pressure area 6 of described casting mold 1 first chill 13 is set, sample ring 12 is set above cylinder sleeve high pressure area 6, and the top of this sample ring 12 is the big rising heads 11 of annular; Adopt furan resin self curing sand in core box, to make mud core 4, second chill 15 is set at the low pressure area 3 of this mud core 4;
Described mould assembling is by processing requirement mud core 4 to be assembled in the casting mold 1, constitutes die cavity between mud core 4 and casting mold 1, adopts the cast form hot air machine that die cavity is carried out preheating;
Above described rising head 11, place cast gate mud core 7 with cast gate 10; At one of cast gate mud core 7 upper fixed bag 9, this bag 9 has iron notch, is drawn the cork 8 to clog.
Described furnace charge melting step comprises the configuration furnace charge, and the composition of this furnace charge is as follows:
Form content wt%
Steel scrap 38～42
The new pig iron 20～40
Foundry returns 20～40
Institute's furnace burdening adopts the intermediate frequency furnace melting, and top temperature is 1500～1520 ℃ during fusing, and soaking time 5～10 minutes is cooled to tapping temperature.
The described step of tapping a blast furnace that breeds specifically comprises being:
1. selecting nucleating agent is composite inoculant, and it constitutes by silico-calcium nucleating agent, molybdenum-iron powder and ferrochrome powder, or nitrogen water ferrochrome powder composition, and its total amount is 0.68～1% assembly of the melting amount of tapping a blast furnace, wherein:
Silico-calcium nucleating agent 0.3～0.45%
Molybdenum-iron powder 0.3～0.45%
Ferrochrome powder 0.05～0.10wt%
Or chromium nitride iron powder 0.05～0.08wt%
It is stand-by to mix the back;
2. tap a blast furnace and breed mode: when molten iron temperature is 1480～1500, tap a blast furnace to casting ladle,, add 1/3 composite inoculant to casting ladle when tapping a blast furnace 1/3 the time by smelting furnace, tapped a blast furnace again 1/3 o'clock, and added remaining 2/3 composite inoculant, continue again to have tapped a blast furnace, stir, skim, sampling.
Described silico-calcium nucleating agent contains the Si of 5～10% Ca 53～60%.
Described molybdenum-iron powder contains 50～55% molybdenum, and the granularity of molybdenum is 0.1～1.0mm.
Described ferrochrome powder contains 55～60% chromium, and the granularity of chromium is 0.1～1.0mm.
Contain 40～60% chromium in the described chromium nitride iron powder, contain 3～5% nitrogen.
Described pouring procedure is: the molten iron after breeding injects the seat bag when the molten iron in the seat bag is cooled to 1340～1360 ℃ by casting ladle, pull out the promotion chock plug by machinery, molten iron is entered in the die cavity by rising head by cast gate, foundry goods is incubated cooling in casting mold, be cooled to less than 760 ℃, unpacking knockout takes out the cylinder sleeve foundry goods, naturally cooling.
Described cleaning promptly is to remove cast gate, rising head from the cylinder sleeve foundry goods, removes the attached sand of cast(ing) surface.
Described calorifier carries out preheating to die cavity, and preheating temperature is 160～180 ℃, and pour into a mould and preceding 15 minute cancel preheating more than 4 hours warm up time.
Technique effect of the present invention is:
After adopting castmethod of the present invention, the large power diesel engine cylinder jacket peculiar to vessel of casting, check after tested, its body material capability has reached σ b 〉=245N/mm
2, σ s 〉=0.3%, HB180～230, metallographic fine pearlite, 1A3/4, cementite+hard phase 3～7%, ferrite＜1%.Materials supply abundance, the easy easy grasp of castmethod, economic benefit of the present invention is obvious, only is similar import cylinder sleeve price about 60%.
Description of drawings
Fig. 1 is the structure cross-sectional schematic of the inventive method embodiment 1 marine large-diameter diesel engine foundry goods cylinder sleeve casting condition.
1-casting mold 2-sandbox 3-cylinder sleeve low pressure area
Nip 6-cylinder sleeve high pressure area in the 4-mud core 5-cylinder sleeve
A 7-cast gate mud core 8-9-seat bag of drawing the cork
10-cast gate 11-rising head 12-sample ring
The 13-first chill 14-cylinder sleeve foundry goods 15-second chill
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structure cross-sectional schematic of the embodiment of the invention 1 marine large-diameter cylinder jacket of diesel engine casting pouring state.Its cylinder diameter is that Φ 800mm, section thickness are 220mm.
The concrete castmethod of the embodiment of the invention 1 comprises the following steps:
(1) molding and core making
The present embodiment cylinder jacket of diesel engine divides three parts: nip 5, cylinder sleeve high pressure area 6 in cylinder sleeve low pressure area 3, the cylinder sleeve, casting technique according to cylinder jacket of diesel engine requires to make wooden model and core box, wooden model is positioned on the template, adopt furan resin self curing sand between sandbox 2 and wooden model, to make casting mold 1, high pressure area 6 at the cylinder sleeve of described casting mold 1 is provided with first chill 13, sample ring 12 is set above cylinder sleeve high pressure area 6, and the top of this sample ring 12 is the big rising heads 11 of annular; Adopt furan resin self curing sand in core box, to make mud core 4, second chill 15 is set at the cylinder sleeve low pressure area 3 of this mud core 4;
(2) mould assembling
Described mould assembling is by processing requirement mud core 4 to be assembled in the casting mold 1, constitutes die cavity between mud core 4 and casting mold 1, adopts the cast form hot air machine that die cavity is carried out preheating, and preheating temperature is 160 ℃, 6 hours warm up time, pours into a mould and cancels preheating in preceding 15 minutes; Described rising head 11 tops are provided with the cast gate mud core 7 with cast gate 10, bag 9 of these cast gate mud core 7 upper fixed, and this bag 9 has iron notch, is drawn the cork 8 to clog;
(3) furnace charge melting
Described furnace charge melting step comprises the configuration furnace charge, and the composition of this furnace charge is as follows:
Form content wt%
Steel scrap 38
The new pig iron 40
Foundry returns 22
Institute's furnace burdening adopts the intermediate frequency furnace melting, and top temperature is 1500 ℃ during fusing, and soaking time 10 minutes is cooled to 1480 ℃ of tapping temperatures;
(4) breed and tap a blast furnace, specifically comprise:
1. the nucleating agent of Xuan Zeing is a composite inoculant, and its formation is made up of silico-calcium nucleating agent, molybdenum-iron powder and ferrochrome powder or nitrogen water ferrochrome powder, and its total amount is by 0.75～1% assembly of the melting amount of tapping a blast furnace, wherein:
Silico-calcium nucleating agent 0.4%
Molybdenum-iron powder 0.3%
Ferrochrome powder or chromium nitride iron powder 0.05wt%
It is stand-by to mix the back;
2. tap a blast furnace and breed mode: when molten iron temperature reaches 1480 ℃, tap a blast furnace to the casting ladle (not shown),, add 1/3 described composite inoculant to casting ladle when tapping a blast furnace 1/3 the time by smelting furnace, tapped a blast furnace again 1/3 o'clock, and added remaining 2/3 composite inoculant, continue again to have tapped a blast furnace, stir, skim, sampling.
(5) cast
Molten iron after breeding injects seat bag 9 by casting ladle, when the molten iron of 9 li of seat bags is cooled to 1340 ℃, pulls out promotion chock plug 8 by machinery, molten iron is entered in the die cavity by rising head 11 by cast gate 10, and foundry goods is incubated cooling in casting mold 1, be cooled to 760 ℃, unpacking knockout takes out the cylinder sleeve foundry goods, naturally cooling;
(6) casting finish
Described cleaning promptly is to remove cast gate 10, riser runner 11 from the cylinder sleeve foundry goods, removes the attached sand of cast(ing) surface;
(7) foundry goods roughing
By roughing figure foundry goods is carried out roughing;
(8) stress annealing
Adopt general method to heat-treat by processing requirement, eliminate stress;
(9) sample testing
Take off sample ring 12, the cylinder sleeve material is detected, after detected result reaches the cylinder jacket of diesel engine technical requirements, promptly finished casting of the present invention.
Following table is the main technologic parameters of several embodiment of the inventive method
| Parameter | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Furnace charge | Steel scrap (offcut of steel plate) (wt%) | ??38 | ??40 | ??42 | ??40 |
| The new pig iron (wt%) | ??40 | ??30 | ??20 | ??20 | |
| Foundry returns (wt%) | ??22 | ??30 | ??38 | ??40 | |
| The melting and pouring parameter | Dissolve top temperature (℃) | ??1500 | ??1515 | ??1520 | ??1520 |
| Tapping temperature (℃) | ??1480 | ??1500 | ??1490 | ??1490 | |
| Teeming temperature (℃) | ??1340 | ??1345 | ??1360 | ??1360 | |
| Foundry goods taking-up temperature (℃) | ??760 | ??720 | ??710 | ??750 | |
| Composite inoculant | Total amount | 0.68～1% assembly by the amount of tapping a blast furnace | |||
| Silico-calcium nucleating agent (%) | ??0.4 | ??0.3 | ??0.45 | ??0.45 | |
| Molybdenum-iron powder (%) | ??0.3 | ??0.3 | ??0.45 | ??0.45 | |
| Ferrochrome powder or chromium nitride iron powder (%) | ??0.05 | ??0.08 | ??0.10 | ??0.10 | |
| The casting mold preheating | Temperature (℃) | ??160 | ??170 | ??180 | ??180 |
| Time (hour) | ??6 | ??8 | ??4 | ??4 | |
| Cancel some warm up time | Poured into a mould preceding 15 minutes | Poured into a mould preceding 10 minutes | Poured into a mould preceding 10 minutes | Poured into a mould preceding 10 minutes | |
The technological process of embodiment 2,3,4 is with embodiment 1, so repeat no more.
The castmethod of marine large-diameter cylinder liner of the present invention has been tried out the casting of the big cylinder-diameter diesel engine III lamp cylinder sleeve more than 700mm, adopts the big cylinder-diameter diesel engine III class cylinder sleeve of the present invention's casting, through the tensile strength sigma b 〉=245N/mm of check material body
2, σ s 〉=0.3%, HB180～230, metallographic fine pearlite, 1A3/4, cementite+hard phase 3～7%, ferrite＜1%., reached the every technical performance index of III class cylinder sleeve.It is obvious to cast big cylinder-diameter diesel engine cylinder sleeve economic benefit with the present invention, only is that similar import cylinder sleeve price is about 60%, and materials supply abundance, the easy easy grasp of castmethod.
Claims (8)
1, a kind of castmethod of marine large-diameter cylinder liner, its step comprises molding and core making, mould assembling, the furnace charge melting is bred and is tapped a blast furnace, cast, casting finish, foundry goods roughing, stress annealing, sample testing is characterized in that:
Described molding and core making is to make wooden model and core box by the casting Technology Design requirement, wooden model is positioned on the template, adopt furan resin self curing sand between sandbox (2) and wooden model, to make casting mold (1), high pressure area (6) in described casting mold (1) is provided with first chill (13), in cylinder sleeve high pressure area (6) top sample ring (12) is set, the top of this sample ring (12) is the big rising head (11) of annular; Adopt furan resin self curing sand in core box, to make mud core (4), second chill (15) is set at the low pressure area (3) of this mud core (4);
Described mould assembling is by processing requirement mud core (4) to be assembled in the casting mold (1), constitutes die cavity between mud core (4) and casting mold (1), adopts the cast form hot air machine that die cavity is carried out preheating;
Place cast gate mud core (7) in described rising head (11) top with cast gate (10); At cast gate mud core (a 7) bag of upper fixed (9), this seat bag (9) has iron notch, and the head (8) of being drawn the cork clogs.
Described furnace charge melting step comprises the configuration furnace charge, and the composition of this furnace charge is as follows:
Form content wt%
Steel scrap 38～42
The new pig iron 20～40
Foundry returns 20～40
Institute's furnace burdening adopts the intermediate frequency furnace melting, and top temperature is 1500～1520 ℃ during fusing, and soaking time 5～10 minutes is cooled to tapping temperature.
The described step of tapping a blast furnace that breeds specifically comprises being:
1. selecting nucleating agent is composite inoculant, and it constitutes by silico-calcium nucleating agent, molybdenum-iron powder and ferrochrome powder, or nitrogen water ferrochrome powder composition, and its total amount is 0.68～1% assembly of the melting amount of tapping a blast furnace, wherein:
Silico-calcium nucleating agent 0.3～0.45%
Molybdenum-iron powder 0.3～0.45%
Ferrochrome powder 0.05～0.10wt%
Or chromium nitride iron powder 0.05～0.08wt%
It is stand-by to mix the back;
2. tap a blast furnace and breed mode: when molten iron temperature is 1480～1500 ℃, tap a blast furnace to casting ladle,, add 1/3 composite inoculant to casting ladle when tapping a blast furnace 1/3 the time by smelting furnace, tapped a blast furnace again 1/3 o'clock, and added remaining 2/3 composite inoculant, continue again to have tapped a blast furnace, stir, skim, sampling.
2, the castmethod of marine large-diameter cylinder liner according to claim 1 is characterized in that described silico-calcium nucleating agent contains 5～10% Ca, 53～60% Si.
3, the castmethod of marine large-diameter cylinder liner according to claim 1 is characterized in that described molybdenum-iron powder contains 50～55% molybdenum, and the granularity of molybdenum is 0.1～1.0mm.
4, the castmethod of marine large-diameter cylinder liner according to claim 1 is characterized in that described ferrochrome powder contains 55～60% chromium, and the granularity of chromium is 0.1～1.0mm.
5, the castmethod of marine large-diameter cylinder liner according to claim 1 is characterized in that containing 40～60% chromium in the described chromium nitride iron powder, contains 3～5% nitrogen.
6, the castmethod of marine large-diameter cylinder liner according to claim 1, it is characterized in that described cast is: the molten iron after breeding injects seat bag (9) by casting ladle, when the molten iron of seat bag (9) lining is cooled to 1340～1360 ℃, pull out promotion chock plug (8) by machinery, molten iron is entered in the die cavity by rising head (11) by cast gate (10), and foundry goods is incubated cooling in casting mold, when temperature is reduced to less than 760 ℃, unpacking knockout takes out the cylinder sleeve foundry goods, naturally cooling.
7, the castmethod of marine large-diameter cylinder liner according to claim 1 is characterized in that: described cleaning promptly is to remove cast gate (10), riser runner (11) from the cylinder sleeve foundry goods, removes the attached sand of cast(ing) surface.
8, the castmethod of marine large-diameter cylinder liner according to claim 1 is characterized in that: described calorifier carries out preheating to die cavity, and preheating temperature is 160～180 ℃, and pour into a mould and preceding 15 minute cancel preheating more than 4 hours warm up time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100274549A CN1295049C (en) | 2005-07-01 | 2005-07-01 | Marine large-diameter cylinder liner casting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100274549A CN1295049C (en) | 2005-07-01 | 2005-07-01 | Marine large-diameter cylinder liner casting method |
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| CN1709614A true CN1709614A (en) | 2005-12-21 |
| CN1295049C CN1295049C (en) | 2007-01-17 |
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| CN101633033B (en) * | 2009-08-18 | 2011-05-18 | 太仓林飞铸造有限公司 | Casting method of thick and large castings |
| CN101905313A (en) * | 2010-07-29 | 2010-12-08 | 苏州市海威特铸造厂 | Method for casting main spindle box |
| CN102554176A (en) * | 2010-11-23 | 2012-07-11 | 南通新景华企业管理服务有限公司 | Preparation process for casting cylinder liner |
| CN102554139A (en) * | 2010-11-23 | 2012-07-11 | 南通新景华企业管理服务有限公司 | Cylinder liner casting technology |
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| CN103350184A (en) * | 2013-07-18 | 2013-10-16 | 河北科技大学 | Metal mold casting chromium white cast iron grinding ball used inoculation coating and preparation method thereof |
| CN103350184B (en) * | 2013-07-18 | 2015-07-01 | 河北科技大学 | Metal mold casting chromium white cast iron grinding ball used inoculation coating and preparation method thereof |
| CN106756453B (en) * | 2016-11-28 | 2018-06-22 | 中国船舶重工集团公司第十二研究所 | A kind of thick and large section gray cast iron cylinder jacket organizational controls method |
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| CN110014123B (en) * | 2019-04-19 | 2021-07-06 | 山东国创精密机械有限公司 | Casting method of hundred-ton-grade spent fuel storage and transportation integrated metal container |
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