CN118060496A - Gravity casting molding method for large cylinder liner of marine low-speed diesel engine - Google Patents
Gravity casting molding method for large cylinder liner of marine low-speed diesel engine Download PDFInfo
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- CN118060496A CN118060496A CN202410399912.4A CN202410399912A CN118060496A CN 118060496 A CN118060496 A CN 118060496A CN 202410399912 A CN202410399912 A CN 202410399912A CN 118060496 A CN118060496 A CN 118060496A
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- core
- casting
- cylinder liner
- mold
- gravity
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- 238000005266 casting Methods 0.000 title claims abstract description 76
- 230000005484 gravity Effects 0.000 title claims abstract description 33
- 238000000465 moulding Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000002054 inoculum Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- OOJQNBIDYDPHHE-UHFFFAOYSA-N barium silicon Chemical compound [Si].[Ba] OOJQNBIDYDPHHE-UHFFFAOYSA-N 0.000 claims description 8
- 239000011449 brick Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 229910000805 Pig iron Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000009750 centrifugal casting Methods 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of production of heavy parts of marine low-speed diesel engines, in particular to a gravity casting molding method of a large cylinder liner of a marine low-speed diesel engine; respectively manufacturing a cylinder sleeve mold and a cylinder sleeve casting mold; molding and assembling; gravity smelting and casting; opening the box to clean the cylinder sleeve casting mold; carrying out subsequent treatment; casting is completed; by adopting gravity casting, the noise is avoided in casting, and the influence on the surrounding environment is avoided.
Description
Technical Field
The invention relates to the technical field of production of heavy parts of marine low-speed diesel engines, in particular to a gravity casting molding method of a large cylinder liner of a marine low-speed diesel engine.
Background
The existing shipbuilding technology tends to be mature, and the types of shipbuilding only begin to step into middle and large sizes. The cylinder sleeve belongs to an upper closing weight part of an engine, the structure is cylindrical, and under the high-temperature and high-pressure working environment, great friction force is generated when the piston reciprocates, and the cylinder sleeve is extremely easy to wear, so that the part is required to have higher tissue compactness and tissue uniformity.
In actual production, centrifugal casting in special casting is generally adopted to realize production, more centrifugal casting is suitable for production of small and medium cylinder liners at present, and meanwhile, a large amount of equipment and special sites are needed to be input in the early stage of centrifugal casting, and the noise of the centrifugal casting is high, so that the surrounding environment is influenced; therefore, it is necessary to provide a gravity casting molding method for a large cylinder liner of a marine low-speed diesel engine by gravity casting.
Disclosure of Invention
The invention aims to provide a gravity casting molding method for a large cylinder liner of a marine low-speed diesel engine, which adopts gravity casting to avoid large noise in casting and influence on the surrounding environment.
In order to achieve the purpose, the gravity casting molding method for the large cylinder liner of the marine low-speed diesel engine comprises the following steps:
Respectively manufacturing a cylinder sleeve mold and a cylinder sleeve casting mold;
molding and assembling;
Gravity smelting and casting;
opening the box to clean the cylinder sleeve casting mold;
carrying out subsequent treatment;
and (5) casting is completed.
Wherein, in the step of manufacturing a cylinder liner mold and a cylinder liner casting mold respectively:
in the cylinder liner mold, a core lower core head, a core bar, a first core, a casting body, a core upper core head, and a second core are included.
Wherein, in the step of manufacturing a cylinder liner mold and a cylinder liner casting mold respectively:
the cylinder sleeve pouring mold comprises a sprue positioning core head, an upper layer cross runner, a filtering module, a lower layer cross runner and an inner runner positioning core head.
Wherein, in the step of molding the mold close box:
During production and manufacture, the bottom tray of the core bar is provided with and fixes two refractory bricks in advance, so that the plane of the core lower core head can be ensured to be smooth;
and after the first core is completely core-setting, the core bars constrain the core-setting head of the core, so that the correction task of the first core is completed.
Wherein, in the step of gravity smelting and casting:
Determining a smelting formula formed under the proper gravity casting condition of the cylinder sleeve, wherein the smelting formula is as follows: q10 pig iron 40%, scrap steel 30%, return furnace material 30%, carburant 0.3%, silicon-barium inoculant 0.2%, 75FeSi inoculant 0.3%, along with flow silicon-barium inoculant 0.15%, and tapping molten iron at 1440-450 ℃.
Wherein, in the step of the subsequent processing:
Including cutting off the riser, sample ring, heat treatment, roughing.
The invention relates to a gravity casting molding method of a large cylinder sleeve of a marine low-speed diesel engine, which is used for respectively manufacturing a cylinder sleeve mold and a cylinder sleeve casting mold; molding and assembling; gravity smelting and casting; opening the box to clean the cylinder sleeve casting mold; carrying out subsequent treatment; casting is completed; by adopting gravity casting, the noise is avoided in casting, and the influence on the surrounding environment is avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of steps of the gravity casting molding method of the large cylinder liner of the marine low-speed diesel engine.
Fig. 2 is a schematic structural view of a cylinder liner mold of the present invention.
Fig. 3 is a schematic structural view of a cylinder liner casting mold of the present invention.
11-Core lower core head, 12-core bar, 13-first core, 14-casting body, 15-core upper core head, 16-second core, 21-sprue positioning core head, 22-upper layer runner, 23-filtration module, 24-lower layer runner and 25-inner runner positioning core head.
Detailed Description
Referring to fig. 1 to 3, the invention provides a gravity casting forming method of a large cylinder liner of a marine low-speed diesel engine, which comprises the following steps:
S1: and manufacturing a cylinder sleeve mold and a cylinder sleeve casting mold respectively.
In the cylinder liner mold, there are included a core lower core head 11, a core bar 12, a first core 13, a casting body 14, an upper core head 15, and a second core 16, as shown in fig. 2: when designing a mould, designing a steel pipe with the diameter of 100-200 mm, welding a tray with the diameter of 1.3-1.5 times of the steel pipe and the thickness of 40mm at the bottom of the steel pipe, and drilling holes with the diameter of 10-20 mm on the surface of the steel pipe at intervals, wherein the steel pipe mainly has the following functions: as the core bar 12, the overall strength of the core lower core head 11 is enhanced, so that the core lower core head is ensured not to deform; a lifting lug is welded on the steel pipe and used as a lifting device and as an important exhaust channel of the core-down core head 11; the diameter of the upper core print 15 is smaller than that of the lower core print 11, and when the core bar 12 is matched with the lower core print 11, loose sand generated by friction cannot enter the casting body 14. In the cylinder liner casting mold, the sprue positioning core head 21, the upper layer runner 22, the filtering module 23, the lower layer runner 24 and the inner runner positioning core head 25 are included, as shown in fig. 3: the cylinder sleeve pouring mold is divided into an upper part and a lower part, wherein the upper part comprises the sprue positioning core head 21 and the upper layer runner 22, and the lower part comprises the filtering module 23, the lower layer runner 24 and the inner runner positioning core head 25; the size of the sprue positioning core head 21 and the size of the ingate positioning core head 25 are determined according to the ceramic tube size selected by the process, and the actual operation is generally 2-3 mm smaller than the standard size; the filter module 23 is tiled by 150mm by 25mm filter bricks, and compared with vertical placement, the vertical placement has the advantage that the effective filtering area is increased by multiplying power, the contour and the shape of the cylinder liner casting mold are determined according to different types of cylinder liners and practical tools, and the contour of the cylinder liner casting mold is in a C shape.
S2: and (5) molding and assembling.
During production and manufacture, the bottom tray of the core bar 12 is provided with and fixes two refractory bricks in advance, so that the plane of the core lower core head 11 can be ensured to be flat; when the first core 13 is left to be set, the horizontal direction is deviated due to the longer length, and the core rod 12 can restrain the core setting head 11, thereby completing the correction task of the first core 13.
S3: and (5) gravity smelting and pouring.
Determining a smelting formula formed under the proper gravity casting condition of the cylinder sleeve, wherein the smelting formula is as follows: q10 pig iron 40%, scrap steel 30%, return furnace material 30%, carburant 0.3%, silicon barium inoculant 0.2%, 75FeSi inoculant 0.3%, along with flow silicon barium inoculant 0.15%, and tapping molten iron temperature 1440-450 ℃; in practical application, further accurate control of chemical elements is required, taking S60 marine cylinder liner as an example: the carbon (C) element requirement is controlled at the lower limit; the requirements of silicon (Si) and manganese (Mn) elements are controlled to be at the upper limit; the elements of phosphorus (P), sulfur (S) and boron (B) are controlled to be in the upper limit, the other elements are controlled to be in the lower limit, the casting temperature is controlled to be 1340-1370 ℃, and sand burning and slag discharging can be effectively prevented.
S4: opening the box to clean the cylinder sleeve casting mold;
S5: subsequent treatment, including riser cutting, sample ring cutting, heat treatment and rough machining;
S6: and (5) casting is completed.
In the present embodiment, first, a cylinder liner mold and a cylinder liner casting mold are separately manufactured. Wherein in the cylinder liner mold, there are included a core-down head 11, a core bar 12, a first core 13, a casting body 14, a core-up head 15, and a second core 16, as shown in fig. 2: when designing a mould, designing a steel pipe with the diameter of 100-200 mm, welding a tray with the diameter of 1.3-1.5 times of the steel pipe and the thickness of 40mm at the bottom of the steel pipe, and drilling holes with the diameter of 10-20 mm on the surface of the steel pipe at intervals, wherein the steel pipe mainly has the following functions: as the core bar 12, the overall strength of the core lower core head 11 is enhanced, so that the core lower core head is ensured not to deform; a lifting lug is welded on the steel pipe and used as a lifting device and as an important exhaust channel of the core-down core head 11; the diameter of the upper core print 15 is smaller than that of the lower core print 11, and when the core bar 12 is matched with the lower core print 11, loose sand generated by friction cannot enter the casting body 14. Wherein in the cylinder liner casting mold, the cylinder liner casting mold comprises a sprue positioning core head 21, an upper layer runner 22, a filtering module 23, a lower layer runner 24 and an inner runner positioning core head 25, as shown in fig. 3: the cylinder sleeve pouring mold is divided into an upper part and a lower part, wherein the upper part comprises the sprue positioning core head 21 and the upper layer runner 22, and the lower part comprises the filtering module 23, the lower layer runner 24 and the inner runner positioning core head 25; the size of the sprue positioning core head 21 and the size of the ingate positioning core head 25 are determined according to the ceramic tube size selected by the process, and the actual operation is generally 2-3 mm smaller than the standard size; the filter module 23 is tiled by 150mm by 25mm filter bricks, and compared with vertical placement, the vertical placement has the advantage that the effective filtering area is increased by multiplying power, the contour and the shape of the cylinder liner casting mold are determined according to different types of cylinder liners and practical tools, and the contour of the cylinder liner casting mold is in a C shape. Then molding and closing the box, and during production and manufacture, placing and fixing two refractory bricks in advance by the bottom tray of the core bar 12, so that the plane of the core lower core head 11 can be ensured to be flat; when the first core 13 is left to be set, the horizontal direction is deviated due to the longer length, and the core rod 12 can restrain the core setting head 11, thereby completing the correction task of the first core 13. And then gravity smelting and casting are carried out. Determining a smelting formula formed under the proper gravity casting condition of the cylinder sleeve, wherein the smelting formula is as follows: q10 pig iron 40%, scrap 30%, return charge 30%, carburant 0.3%, silicon barium inoculant 0.2%, 75FeSi inoculant 0.3%, along with flow silicon barium inoculant 0.15%, tapping molten iron temperature 1440-450 ℃, thereby achieving the chemical composition specified in Table 1:
table 1:
in practical application, further accurate control of chemical elements is required, taking S60 marine cylinder liner as an example: the carbon (C) element requirement is controlled at the lower limit; the requirements of silicon (Si) and manganese (Mn) elements are controlled to be at the upper limit; the elements of phosphorus (P), sulfur (S) and boron (B) are controlled to be in the upper limit, the other elements are controlled to be in the lower limit, the casting temperature is controlled to be 1340-1370 ℃, and sand burning and slag discharging can be effectively prevented. Then opening the box for cleaning, and cleaning the cylinder sleeve casting mold; then carrying out subsequent treatment, including riser cutting, sample ring cutting, heat treatment and rough machining; and (5) casting is completed. By adopting gravity casting, the noise is avoided in casting, and the influence on the surrounding environment is avoided.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (6)
1. The gravity casting forming method of the large cylinder liner of the marine low-speed diesel engine is characterized by comprising the following steps of:
Respectively manufacturing a cylinder sleeve mold and a cylinder sleeve casting mold;
molding and assembling;
Gravity smelting and casting;
opening the box to clean the cylinder sleeve casting mold;
carrying out subsequent treatment;
and (5) casting is completed.
2. The gravity casting molding method of a large cylinder liner of a marine low-speed diesel engine according to claim 1, wherein in the step of separately manufacturing a cylinder liner mold and a cylinder liner casting mold:
in the cylinder liner mold, a core lower core head, a core bar, a first core, a casting body, a core upper core head, and a second core are included.
3. The gravity casting molding method of a large cylinder liner of a marine low-speed diesel engine according to claim 1, wherein in the step of separately manufacturing a cylinder liner mold and a cylinder liner casting mold:
the cylinder sleeve pouring mold comprises a sprue positioning core head, an upper layer cross runner, a filtering module, a lower layer cross runner and an inner runner positioning core head.
4. The gravity casting molding method of a large cylinder liner of a marine low-speed diesel engine according to claim 2, wherein in the step of molding the mold box:
During production and manufacture, the bottom tray of the core bar is provided with and fixes two refractory bricks in advance, so that the plane of the core lower core head can be ensured to be smooth;
and after the first core is completely core-setting, the core bars constrain the core-setting head of the core, so that the correction task of the first core is completed.
5. The gravity casting molding method for a large cylinder liner of a marine low-speed diesel engine according to claim 1, wherein in the gravity smelting casting step:
Determining a smelting formula formed under the proper gravity casting condition of the cylinder sleeve, wherein the smelting formula is as follows: q10 pig iron 40%, scrap steel 30%, return furnace material 30%, carburant 0.3%, silicon-barium inoculant 0.2%, 75FeSi inoculant 0.3%, along with flow silicon-barium inoculant 0.15%, and tapping molten iron at 1440-450 ℃.
6. The gravity casting molding method of a large cylinder liner of a marine low-speed diesel engine according to claim 1, wherein in the step of the subsequent processing:
Including cutting off the riser, sample ring, heat treatment, roughing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410399912.4A CN118060496A (en) | 2024-04-03 | 2024-04-03 | Gravity casting molding method for large cylinder liner of marine low-speed diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410399912.4A CN118060496A (en) | 2024-04-03 | 2024-04-03 | Gravity casting molding method for large cylinder liner of marine low-speed diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118060496A true CN118060496A (en) | 2024-05-24 |
Family
ID=91109683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410399912.4A Pending CN118060496A (en) | 2024-04-03 | 2024-04-03 | Gravity casting molding method for large cylinder liner of marine low-speed diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118060496A (en) |
-
2024
- 2024-04-03 CN CN202410399912.4A patent/CN118060496A/en active Pending
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