CN1295049C - Marine large-diameter cylinder liner casting method - Google Patents
Marine large-diameter cylinder liner casting method Download PDFInfo
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- CN1295049C CN1295049C CNB2005100274549A CN200510027454A CN1295049C CN 1295049 C CN1295049 C CN 1295049C CN B2005100274549 A CNB2005100274549 A CN B2005100274549A CN 200510027454 A CN200510027454 A CN 200510027454A CN 1295049 C CN1295049 C CN 1295049C
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Abstract
The present invention relates to a casting method of a large diameter cylinder liner for a ship, which has the following procedures of molding and core making, box combining, charging melting, inoculating and tapping, pouring, casting cleaning, coarsely casting processing, stress annealing and sample testing. The present invention is characterized in that a runner soil core with a runner is arranged above a casting riser; a seat package is fixed above the runner soil core; the seat package is provided with a tapping opening and is plugged by a pull plug head. The present invention has the charging melting procedures that charging uses a middle frequency furnace for melting according to the proportion of 38 to 42 wt% waste steel, 20 to 40 wt% of new pig iron, and 20 to 40 wt% of recycled charging. The highest temperature is from 1500 to 1520DEG during melting, and the preserving time is from 5 to 10 minutes. The temperature is reduced until the tapping temperature. A high power diesel engine cylinder linear cast by the present invention for the ship reaches the index of each technical performance of a diesel engine third kind cylinder liner for the ship. The present invention has the characteristics of non-complicated casting method and sufficient material supply, and has great economical benefits.
Description
Technical field
The present invention relates to marine diesel, particularly a kind of casting method 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 higher-pressure region, middle nip, low-pressure area three parts.Cylinder jacket is one of strength member that constitutes the diesel combustion chamber, and condition of work is very severe, when its bore area bears the effect of high-temperature high-pressure burning gases, also to bear and piston ring between sliding friction, outer surface will stand cooling.Wherein abominable with the condition of higher-pressure region.For big cylinder-diameter diesel engine III class cylinder jacket, difficulty height especially, the foundry goods thick above material bulk properties of 200mm that reaches in position, higher-pressure region requires tensile strength sigma b 〉=245N/mm
2, percentage 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 casting method of marine large-diameter cylinder liner, so that our cylinder sleeve foundry goods satisfies the requirement of above-mentioned high-power diesel engine peculiar to vessel, be the anti-intensity σ b 〉=245N/mm2 of material body, percentage 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 casting method 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 cleaning, 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 the furans tree to refer to that self-hardening sand makes casting mold 1 between sandbox 2 and wooden model, at the casting mold 1 that is positioned at 6 places, cylinder sleeve higher-pressure region first chill 13 is set, sample ring 12 is set above cylinder sleeve higher-pressure region 6, and the top of this sample ring 12 is provided with 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 mud core 4 that is positioned at cylinder sleeve low-pressure area 3 places;
Described mould assembling is by technological 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 the big rising head 11 of described annular, 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 tapping hole, 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 maximum temperature is 1500～1520 ℃ during fusing, and temperature retention time 5～10 minutes is cooled to tapping temperature.
The described step of tapping a blast furnace that breeds specifically comprises:
1. selecting inovulant is composite inoculant, and it constitutes by silico-calcium inovulant, molybdenum-iron powder and ferrochrome powder, or chromium nitride iron powder composition, and its total amount is 0.68～1wt% assembly of the melting amount of tapping a blast furnace, wherein:
Silico-calcium inovulant 0.3～0.45wt%
Key iron powder 0.3～0.45wt%
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 inovulant contains the calcium of 5～10wt%, the silicon of 53～60wt%.
Described molybdenum-iron powder contains the molybdenum of 50～55wt%, and the granularity of molybdenum is 0.1～1.0mm.
Described ferrochrome powder contains the chromium of 55～60wt%, and the granularity of chromium is 0.1～1.0mm.
The chromium that contains 40～60wt% in the described chromium nitride iron powder contains the nitrogen of 3～5wt%.
Described pouring procedure is: the molten iron after breeding injects the seat bag by casting ladle, when the molten iron in the seat bag is cooled to 1340～1360 ℃, pull out the promotion chock plug by machinery, molten iron is entered in the die cavity by the big rising head of annular by cast gate, foundry goods is incubated cooling in casting mold, be cooled to less than 760 ℃, the knockout of unpacking, take out the cylinder sleeve foundry goods, naturally cooling.
Described cleaning promptly is to remove cast gate, the big rising head of annular from the cylinder sleeve foundry goods, removes the attached sand of cast(ing) surface.
Described air-heater carries out preheating to die cavity, and preheat temperature is 160 ~ 180 ℃, and pour into a mould and preceding 15 minute cancel preheating more than 4 hours preheating time.
Technique effect of the present invention is:
After adopting casting method 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%.Material is in liberal supply, the easy easy grasp of casting method, and 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 higher-pressure region in the 4-mud core 5-cylinder sleeve
A 7-cast gate mud core 8-9-seat bag of drawing the cork
The big rising head 12-sample ring of 10-cast gate 11-annular
13-first chill 14-cylinder sleeve casting 15-second chill
The specific embodiment
The invention will be further described for following structure embodiment and accompanying drawing, but should not limit the protection domain of this locust with this.
See also Fig. 1 earlier, Fig. 1 is the structure cross-sectional schematic of the embodiment of the invention 1 high-power diesel engine cylinder sleeve casting pouring state peculiar to vessel.Its cylinder diameter is that Φ 776mm section thickness is 220mm.
The concrete casting method 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 higher-pressure region 6 in cylinder sleeve low-pressure area 3, the cylinder sleeve, make wooden model and core box according to the casting technique requirement of cylinder jacket of diesel engine, and wooden model is positioned on the template; Adopt the furans tree to refer to that self-hardening sand makes casting mold 1 between sandbox 2 and wooden model, first chill 13 is set in the casting mold 1 at 6 places, cylinder sleeve higher-pressure region, sample ring 12 is set above cylinder sleeve higher-pressure region 6, the top of this sample ring 12 is annular rising heads 11 greatly; Adopt furan resin self curing sand in core box, to make mud core 4, second chill 15 is set in the mud core 4 at cylinder sleeve low-pressure area 3 places;
(2) mould assembling
Described mould assembling is by technological 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 preheat temperature is 160 ℃, 6 hours preheating time, pours into a mould and cancels preheating in preceding 15 minutes; The big rising head of described annular 11 tops are provided with the cast gate mud core 7 with cast gate 10; At one of these cast gate mud core 7 upper fixed bag 9, this bag 9 has tapping hole, 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 maximum temperature is 1500 ℃ during fusing, and temperature retention time 10 minutes is cooled to 1480 ℃ of tapping temperatures;
(4) breed and tap a blast furnace, specifically comprise:
1. the inovulant of Xuan Zeing is a composite inoculant, and its formation is made up of silico-calcium inovulant, molybdenum-iron powder and ferrochrome powder or chromium nitride iron powder, and its total amount is by 0.75～1wt% assembly of the melting amount of tapping a blast furnace, wherein:
Silico-calcium inovulant 0.4wt%
Key iron powder 0.3wt%
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 ℃, pull out promotion chock plug 8 by machinery, molten iron is entered in the die cavity by the big rising head 11 of annular by cast gate 10, foundry goods is incubated cooling in casting mold 1, be cooled to 760 ℃, the knockout of unpacking, take out the cylinder sleeve foundry goods, naturally cooling;
(6) casting cleaning
Described cleaning, promptly be remove from the cylinder sleeve foundry goods water 10, the big rising head 11 of annular, remove the attached sand of cast(ing) surface;
(7) foundry goods roughing
By roughing figure foundry goods is carried out roughing;
(8) stress annealing
Adopt conventional method to heat-treat by technological requirement, eliminate stress;
(9) sample testing
Take off sample ring 12, the cylinder sleeve material is detected, after testing result reaches the cylinder jacket of diesel engine specification requirement, promptly finished casting of the present invention.
Following table is the main technologic parameters of the 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 | |
| Fusing cast parameter | The fusing maximum temperature (℃) | 1500 | 1515 | 1520 | 1520 |
| Tapping temperature (℃) | 1480 | 1500 | 1490 | 1490 | |
| Pouring temperature (℃) | 1340 | 1345 | 1360 | 1360 | |
| Foundry goods taking-up temperature (℃) | 760 | 720 | 710 | 750 | |
| Composite inoculant | Total amount | 0.68～1wt% assembly by the amount of tapping a blast furnace | |||
| Silico-calcium inovulant (wt%) | 0.4 | 0.3 | 0.45 | 0.45 | |
| Molybdenum-iron powder (wt%) | 0.3 | 0.3 | 0.45 | 0.45 | |
| Ferrochrome powder or chromium nitride iron powder (wt%) | 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 preheating 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 technical process of embodiment 2,3,4 is with embodiment 1, so repeat no more.
The casting method of marine large-diameter cylinder liner of the present invention has been tried out the casting of the big cylinder-diameter diesel engine III cylinder jacket more than 700mm, adopt the big cylinder-diameter diesel engine III class cylinder jacket of the present invention's casting, tensile strength sigma b 〉=245N/mm2 through check material body, σ s 〉=0.3%, HB180-230, metallographic fine pearlite, 1A3/4, cementite+hard phase 3～7%, ferrite＜1% has reached the every technical performance index of III class cylinder jacket.It is obvious to cast big cylinder-diameter diesel engine cylinder sleeve economic benefit with the present invention, only be that similar import cylinder sleeve price is about 60%, and material is in liberal supply, the easy easy grasp of casting method.
Claims (8)
1, a kind of casting method 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 cleaning, 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 the furans tree to refer to that self-hardening sand makes casting mold (1) between sandbox (2) and wooden model, first chill (13) is set being positioned at the casting mold of locating cylinder sleeve higher-pressure region (6) (1), in cylinder sleeve higher-pressure region (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), locate mud core (4) second chill (15) is set being positioned at cylinder jacket low-pressure area (3);
Described mould assembling is by technological 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 the big rising head of described annular (11) top with cast gate (10); At cast gate mud core (a 7) bag of upper fixed (9), this seat bag (9) has tapping hole, 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 maximum temperature is 1500～1520 ℃ during fusing, and temperature retention time 5～10 minutes is cooled to tapping temperature;
The described step of tapping a blast furnace that breeds specifically comprises:
1. selecting inovulant is composite inoculant, and it constitutes by silico-calcium inovulant, molybdenum-iron powder and ferrochrome powder, or the chromium nitride iron powder forms, and its gross weight is tap a blast furnace 0.68～1wt% assembly of weight of melting, wherein:
Silico-calcium inovulant 0.3～0.45wt%
Key iron powder 0.3～0.45wt%
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 casting method of marine large-diameter cylinder liner according to claim 1 is characterized in that described silico-calcium inovulant contains the calcium of 5～10wt%, the silicon of 53～60wt%.
3, the casting method of marine large-diameter cylinder liner according to claim 1 is characterized in that described molybdenum-iron powder contains the molybdenum of 50～55wt%, and the granularity of molybdenum is 0.1～1.0mm.
4, the casting method of marine large-diameter cylinder liner according to claim 1 is characterized in that described ferrochrome powder contains the chromium of 55～60wt%, and the granularity of chromium is 0.1～1.0mm.
5, the casting method of marine large-diameter cylinder liner according to claim 1 is characterized in that containing in the described chromium nitride iron powder chromium of 40～60wt%, contains the nitrogen of 3～5wt%.
6, the casting method 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 the big rising head (11) of annular by cast gate (10), and 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.
7, the casting method of marine large-diameter cylinder liner according to claim 1 is characterized in that: described cleaning promptly is to remove cast gate (10), the big rising head (11) of annular from the cylinder sleeve foundry goods, removes the attached sand of cast(ing) surface.
8, the casting method of marine large-diameter cylinder liner according to claim 1 is characterized in that: described air-heater carries out preheating to die cavity, and preheat temperature is 160～180 ℃, and pour into a mould and preceding 15 minute cancel preheating more than 4 hours preheating 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 |
Applications Claiming Priority (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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| CN1709614A CN1709614A (en) | 2005-12-21 |
| CN1295049C true CN1295049C (en) | 2007-01-17 |
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| CNB2005100274549A Expired - Fee Related CN1295049C (en) | 2005-07-01 | 2005-07-01 | Marine large-diameter cylinder liner casting 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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| CN1064425A (en) * | 1992-02-03 | 1992-09-16 | 大连机车车辆工厂配件分厂 | Alloy cast iron cylinder jacke centre spinning method and equipment |
| CN1258578A (en) * | 1998-12-25 | 2000-07-05 | 本田技研工业株式会社 | Cylinder jacket |
| CN1333104A (en) * | 2000-07-12 | 2002-01-30 | 山东科技大学机械厂 | Method for producing cast iron cylinder jacket of diesel engine |
| CN1477321A (en) * | 2003-03-28 | 2004-02-25 | 余宪章 | cylinder sleeve preparation process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1064425A (en) * | 1992-02-03 | 1992-09-16 | 大连机车车辆工厂配件分厂 | Alloy cast iron cylinder jacke centre spinning method and equipment |
| CN1258578A (en) * | 1998-12-25 | 2000-07-05 | 本田技研工业株式会社 | Cylinder jacket |
| CN1333104A (en) * | 2000-07-12 | 2002-01-30 | 山东科技大学机械厂 | Method for producing cast iron cylinder jacket of diesel engine |
| CN1477321A (en) * | 2003-03-28 | 2004-02-25 | 余宪章 | cylinder sleeve preparation process |
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Effective date of registration: 20090703 Address after: No. 2851 Pudong Road, Shanghai, Research Institute of machine building, zip code: 200129 Co-patentee after: Shanghai Hulin Heavy Industry Co., Ltd. Patentee after: Hudong heavy machine Co., Ltd. Address before: No. 2851 Pudong Road, Shanghai, Research Institute of machine building, zip code: 200129 Patentee before: Hudong Heavy Mechine Co., Ltd. |
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