CN111390106A - Process design method of large-scale marine upper casting - Google Patents
Process design method of large-scale marine upper casting Download PDFInfo
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- CN111390106A CN111390106A CN202010143797.6A CN202010143797A CN111390106A CN 111390106 A CN111390106 A CN 111390106A CN 202010143797 A CN202010143797 A CN 202010143797A CN 111390106 A CN111390106 A CN 111390106A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- 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
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
Abstract
The invention discloses a process design method of a large ship upper casting, which is optimized on the basis of the existing process and comprises the following steps: (1) the linear shrinkage rate is selected to be 1.8-2.0%; (2) the position of a rib plate of a steel plate in contact welding with a ship body is additionally provided with a cutter inspection tool; (3) the process correction amount is additionally arranged at the rib plate; (4) horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the pattern draft of 1: 20; (5) the riser is designed by a hot-section circle method and is provided with point casting; (6) selecting an upper middle surface and a lower middle surface as parting surfaces; (7) horizontally placing and hanging sand external chill on the back of the riser; (8) and selecting proper hole wrapping and number according to gross weight and maximum height of the casting. The process design method can ensure the casting quality of the upper casting, meets the use requirements of shipyards, improves the production efficiency, reduces the production cost, and is suitable for the lower casting, the upper and lower rudder buttons, the rudder stock bearing and the rudder pintle bearing.
Description
Technical Field
The invention belongs to the technical field of cast steel, and particularly relates to a process design method of a large-scale marine upper casting.
Background
The casting forming is an important production method of equipment part blanks, is the basis of the manufacturing industry and represents the national basic equipment industry level. The large marine upper casting has the characteristics of large outline size, complex curved surface shape, large wall thickness change, easy deformation in the casting process and difficult control of size precision.
The export quantity of the marine steel castings produced every year in China accounts for the first global place, but the export quantity has a larger gap in the aspect of the overall technical level compared with developed countries, and the export quantity mainly shows that the service performance is poorer, the process yield is low, the repair rate is high, and the price is also lower.
Under the condition of large casting environment, casting enterprises face strong competition and severe challenge, and process innovation is urgently needed to continuously improve the product quality and the working efficiency and reduce the production cost and the trial-production cost.
At present, domestic marine steel castings mainly have the defects of a plurality of defects and high repair rate. Particularly, the shaft hole position is the most main part of a marine upper casting, but the problem is often caused in the prior art, the gas holes are generated at the shaft hole position due to unsmooth exhaust, cracks are generated, the repair is difficult at the shaft hole position, and repair welding is not allowed at the shaft hole position under the common condition. The rib plates are deformed and repeatedly repaired, so that the construction period is influenced, and the cost is increased.
The technical problems to be solved by the invention are as follows: the position of the shaft hole generates air holes due to unsmooth exhaust, and cracks are generated; the rib plates are deformed, so that the rib plates of the casting cannot be butted with the ship body steel plate; the casting defects are formed on the lower part of the casting due to unsmooth feeding.
Disclosure of Invention
The invention aims to provide a process design method of a large-scale marine upper casting. The process method can meet the ship specification requirements of various large classification societies, not only ensures the quality of the casting, has no casting quality defect after production, but also improves the production efficiency and reduces the production cost; the process method is suitable for lower castings, upper and lower rudder buttons, rudder stock bearing seats and rudder pintle bearing seats.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a process design method for a large ship upper casting specifically comprises the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage rate is selected to be 1.8-2.0%;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate of a welded steel plate, which is in contact with the ship body, and the cutter inspection amount is selected according to the maximum outline size of the casting and is 10-20 mm;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate and is transited to 0 from the two sides of the rib plate to the 300mm deep direction, and the process correction amount is 5-10 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the pattern draft of 1: 20-40;
(5) the design of the riser is improved: the riser is designed by a hot section circle method, point casting is arranged on the riser, the width of the riser is more than or equal to 800mm and less than or equal to 1200mm, and the riser is cast once; casting the dead head twice with the width of the dead head of 1200mm < phi > not more than 1600 mm;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser;
(8) a pouring system: selecting proper hole wrapping and number according to gross weight and maximum height of the casting, and calculating pouring time: s = Q/nq, wherein: s-pouring time, unit is S, Q-casting gross weight, unit is kg, n-number of covering holes, unit is number, and Q-unit time includes molten steel flow of the covering holes.
The linear shrinkage rate selection in the step (1) is suitable for the molding of the sodium silicate self-hardening sand.
The step (7) of the present invention cannot use direct chill.
According to the invention, in the step (8), the gross weight D of the casting is less than or equal to 5000kg, the rising speed is 25mm/s, the gross weight D of the casting is less than or equal to 15000kg and 10mm/s after 5000kg, the gross weight D of the casting is less than or equal to 35000kg and the rising speed is 8mm/s, the gross weight D of the casting is less than or equal to 35000kg and the rising speed is 4mm/s after 35000 kg.
The design method of the invention eliminates the defect of air holes formed by difficult air exhaust in the shaft hole and the shrinkage cavity formed by overlarge thermal budget at the bottom of the casting. The quality of the casting product is greatly improved, the cost caused by repairing the casting defects is saved, and the production efficiency is improved.
The design method not only ensures the flatness of the upper and lower rib plates at the joint with the steel plate, but also saves the time for cleaning and repeatedly finishing the rib plates. Meanwhile, the production efficiency is improved, and the production cost is reduced.
The process design method is suitable for an upper casting, a lower casting, an upper rudder button, a lower rudder button, a rudder stock bearing and a rudder pintle bearing.
The process design method of the present invention produces 180 products, which have been sent out over 160. The product is qualified after inspection, has no casting defects, has over-hard product quality, is good commented and is evaluated as an excellent supplier by each large shipyard. The product users include nationwide famous shipyards such as overseas high-bridge shipyards and Jiangsu new-age shipyards. Because of no casting defect, the cleaning and finishing time in the later period is reduced, the production efficiency is improved, the construction period is ensured, and the manual repeated finishing cost is saved. The average time saved by each product is about 10 days, and the cost saved is 1000 yuan/t. If 50 marine castings are produced on average in one year, each casting is calculated according to 20t, the cost can be saved by 100 ten thousand yuan, and the time can be saved by 500 days.
The design idea of the invention is as follows:
the linear shrinkage rate is selected to be 1.8-2.0% according to the structural characteristics of the upper casting, and the method is suitable for molding the sodium silicate self-hardening sand. Too large or too small a linear shrinkage rate can cause dimensional deviation of castings and increase subsequent cleaning cost. The prior linear shrinkage rate is 1.5%, and practical production verifies that the external dimension and the process design of an upper casting produced according to the linear shrinkage rate are deviated, so that short ruler is caused, and the weld repair needs to be cleaned in the later period. The effect is good after the concentration is adjusted to 1.8-2.0%.
The drawing of the upper casting designed by shipyard only has the processing on the upper and lower surfaces, but has no processing on the rib plate which is in contact with the ship body and welded with the steel plate, and the verticality of the end surfaces of the upper and lower rib plates is ensured because the rib plate is butted with the steel plate. The perpendicularity is hard to meet the requirements through manual polishing, and after the perpendicularity is sent to a user, the user puts forward a quality objection. Cleaning and repeated trimming, and increasing the production cost. The cutter inspection is added at the rib plate, so that the appearance of the casting is attractive, and the cleaning and finishing time and cost are saved.
The wall thickness of the upper casting rib plate is thin, the wall thickness of the casting adjacent to the rib plate is thick, molded lines at the rib plate are easy to deform after the casting is solidified and contracted, and the process correction amount is additionally arranged at the rib plate. The flatness of the upper and lower rib plates at the joint with the steel plate is ensured, and the trimming time of cleaning and the quality problem caused by cleaning are saved.
The upper casting is generally made by selecting a full-mold, a middle round hole wood is used as a core box, one half is used as a whole, and the other half is made into two or three sections (according to the core size). According to the reaction of shipyards, the middle holes of the castings of a plurality of manufacturers have small cracks, and the middle holes are important parts of the upper castings and have strict quality requirements. Analyzing the cause of crack generation: the periphery of the sand core is surrounded by molten steel, the heating action is large, gas generated by the sand core cannot be discharged under the influence of the environment, and pores are formed at the position of the middle hole, so that cracks are generated. According to the invention, the exhaust steel pipe is horizontally arranged in the middle of the loam core, and the grass ropes are wound outside the peripheral cutting holes, so that the strength of the loam core is increased, and the loam core is more favorable for core exhaust.
The riser is designed by a thermal pitch circle method, the riser is generally 1.8-2.0 times of the maximum thermal pitch circle of the casting, and the feeding can be met when the longitudinal distance a/b is less than 4. The distance of C is more than or equal to the thermal nodes on two sides. When the width of the dead head is larger than 800mm, the dead head needs to be cast. The dead head is provided with a spot casting to realize sequential solidification of the casting, so that a high-quality casting is obtained.
Because the upper casting piece is symmetrical up and down, the upper middle surface and the lower middle surface are selected as parting surfaces.
Sand external chills are horizontally placed and hung on the back of the riser, and the size of the chills is determined according to two side thermal pitch circles at the bottom and a feeding channel. The chilling block adopts sand hanging external chilling block, so that cracks caused by too violent chilling of direct chilling block are avoided.
The rising speed of the molten steel is one of important factors for obtaining high-quality castings, and proper ladle holes and the number of the ladle holes are selected according to the gross weight and the maximum height of the castings. The rising speed of the molten steel is slow, and the upper surface of the sand mold falls off due to the strong radiation effect of the molten steel for a long time; the molten steel rises at an excessively high speed, so that air holes are generated in castings, and the large castings are often damaged due to the fact that the cavity and the upper box are under the action of high pressure, so that accidents are caused.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the process design scheme of the invention innovatively adds the knife detection on the basis of the prior art, thereby not only ensuring the flatness of the upper and lower rib plates at the butt joint with the steel plate, but also saving the trimming time of cleaning and the quality problem caused by cleaning; the process correction amount is added, so that the phenomenon that the rib plate deforms and the rudder blade molded line does not conform due to casting, solidification and shrinkage is effectively avoided, and the welding correction amount required by the deflection of the rib plate is saved; the air exhaust steel pipe is horizontally arranged in the middle of the sand core, so that air exhaust is facilitated, the defect of air holes formed in the shaft hole due to difficulty in air exhaust is eliminated, and shrinkage cavities are formed at the bottom of the casting due to overlarge thermal junctions; the dead head is provided with a spot casting to realize sequential solidification of the casting, so that a high-quality casting is obtained; the chilling block adopts sand hanging external chilling block, so that cracks caused by too violent chilling of direct chilling block are avoided. 2. The process design scheme of the invention not only meets the ship specification requirements of various large classification societies, but also ensures the quality of the casting, has no casting quality defect after production, improves the production efficiency and reduces the production cost. 3. The process design scheme of the invention has been verified by production, has good quality and no quality defect, and is suitable for an upper casting, a lower casting, an upper rudder button, a lower rudder button, a rudder stock bearing and a rudder pintle bearing.
Drawings
FIG. 1 is a schematic view of a rib plate processing part;
FIG. 2 is a schematic view of the process correction amount;
FIG. 3 is a schematic diagram of model design;
FIG. 4 is a schematic view of a riser design;
fig. 5 is a schematic diagram of a chiller.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
The casting of the embodiment has gross weight: 10200kg, material: carbon manganese steel, contour dimension: 1770mm 870mm 1180 mm;
the process design method of the large ship upper casting is optimized on the basis of the existing process, and specifically comprises the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage is 1.95%;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate which is in contact with and welded with the ship body to weld the steel plate, the cutter inspection amount is 10mm, and the position where the cutter inspection is added is shown in figure 1;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate, as shown in figure 2, the inward transition of two sides of the rib plate is from +5mm to 0, and the length of a transition area is 300 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to a drawing slope of 1:25, wherein the drawing is shown in figure 3;
(5) the design of the riser is improved: the riser is designed by a hot section circle method, point casting is arranged on the riser, the diameter of the riser is phi 1000, and the riser is subjected to point casting once; the riser design is shown in FIG. 4;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser; the chilling block is shown in figure 5;
(8) a pouring system: the casting pouring ladle hole is 1 phi 90.
The process design method for producing the large marine upper casting has the advantages that the large marine upper casting is produced by the process design method, the product has no casting quality defect, the production efficiency is improved, and the production cost is reduced; 2200 yuan welding wire is saved, 8000 yuan labor, construction period and repair cost are saved, and 10200 yuan is saved in total for each casting.
Example 2
The casting of the embodiment has gross weight: 23000 kg; the material is as follows: carbon manganese steel; contour dimension: 2350mm 2075mm 1390 mm;
the process design method of the large ship upper casting is optimized on the basis of the existing process, and specifically comprises the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage rate is 1.85 percent;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate which is in contact with and welded with the ship body to weld the steel plate, the cutter inspection amount is 15mm, and the position where the cutter inspection is added is shown in figure 1;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate, as shown in figure 2, the inward transition of two sides of the rib plate is from +8mm to 0, and the length of a transition area is 300 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the draft angle of 1:35, wherein the draft steel pipe is shown in figure 3;
(5) the design of the riser is improved: the design of the riser adopts a hot section circle method, the riser is provided with point casting, the diameter of the riser is phi 1100, and the riser is subjected to point casting once; the riser design is shown in FIG. 4;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser; the chilling block is shown in figure 5;
(8) a pouring system: the casting pouring ladle hole is 1 phi 110.
The process design method for producing the upper casting for the large ship is adopted to produce the lower casting for the large ship, so that the product has no casting quality defect, the production efficiency is improved, and the production cost is reduced; 5000 yuan of welding wire is saved, 18000 yuan is saved in labor, construction period and repair cost, and 23000 yuan is saved in total for each casting.
Example 3
The casting of the embodiment has gross weight: 32000 kg; the material is as follows: carbon manganese steel; contour dimension: 2285mm 1650mm 1820 mm;
the process design method of the large ship upper casting is optimized on the basis of the existing process, and specifically comprises the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage is 1.8%;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate which is in contact with and welded with the ship body to weld the steel plate, the cutter inspection amount is 20mm, and the position where the cutter inspection is added is shown in figure 1;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate, as shown in figure 2, the inward transition of two sides of the rib plate is from +8mm to 0, and the length of a transition area is 300 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the draft angle of 1:40, wherein the draft steel pipe is shown in figure 3;
(5) the design of the riser is improved: the design of the riser adopts a hot section circle method, the riser is provided with point casting, the diameter of the riser is phi 1200, and the riser is subjected to point casting once; the riser design is shown in FIG. 4;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser; the chilling block is shown in figure 5;
(8) a pouring system: the casting pouring ladle hole is 1 phi 110.
The upper rudder button and the lower rudder button for the large ship are produced by adopting the process design method of the upper casting for the large ship, the product has no casting quality defect, the production efficiency is improved, and the production cost is reduced; 7000 yuan of welding wires are saved, 25000 yuan of labor, construction period and repair cost are saved, and each casting piece is 32000 yuan in total.
Example 4
The casting of the embodiment has gross weight: 7800 kg; the material is as follows: carbon manganese steel; contour dimension: 1600mm 936mm 1100 mm;
the process design method of the large ship upper casting is optimized on the basis of the existing process, and specifically comprises the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage rate is 2.0%;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate which is in contact with and welded with the ship body to form a steel plate, the cutter inspection amount is 8mm, and the position where the cutter inspection is added is shown in figure 1;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate, as shown in figure 2, the inward transition of two sides of the rib plate is from +5mm to 0, and the length of a transition area is 200 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the draft angle of 1:20, wherein the draft steel pipe is shown in figure 3;
(5) the design of the riser is improved: the riser is designed by a hot section circle method, point casting is arranged on the riser, the diameter of the riser is phi 820, and the riser is subjected to point casting once; the riser design is shown in FIG. 4;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser; the chilling block is shown in figure 5;
(8) a pouring system: the casting pouring ladle hole is 1 phi 90.
The upper rudder button and the lower rudder button for the large ship are produced by adopting the process design method of the upper casting for the large ship, the product has no casting quality defect, the production efficiency is improved, and the production cost is reduced; saving welding wire 1600 yuan, saving 6200 yuan for labor, construction period and repair cost, and saving 7800 yuan for each casting.
Example 5
The casting of the embodiment has gross weight: 19000 kg; the material is as follows: carbon manganese steel; contour dimension: 1950mm 1350mm 1400 mm;
the process design method of the large ship upper casting is optimized on the basis of the existing process, and specifically comprises the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage rate is 1.90%;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate which is in contact with and welded with the ship body to form a steel plate, the cutter inspection amount is 12mm, and the position where the cutter inspection is added is shown in figure 1;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate, as shown in figure 2, the inward transition of two sides of the rib plate is from +7mm to 0, and the length of a transition area is 250 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the pattern draft of 1:30, wherein the figure is shown in fig. 3;
(5) the design of the riser is improved: the riser is designed by a hot section circle method, point casting is carried out on the riser, the diameter of the riser is phi 900, and the riser is subjected to point casting for 1 time; the riser design is shown in FIG. 4;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser; the chilling block is shown in figure 5;
(8) a pouring system: the casting pouring ladle hole is 1 phi 110.
The upper rudder button and the lower rudder button for the large ship are produced by adopting the process design method of the upper casting for the large ship, the product has no casting quality defect, the production efficiency is improved, and the production cost is reduced; the welding wire is saved by 4000 yuan, the labor, the construction period and the repair cost are saved by 15000 yuan, and each casting piece is saved by 19000 yuan in total.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. A process design method for castings on large ships is characterized by comprising the following steps:
(1) selecting the linear shrinkage rate: the linear shrinkage rate is selected to be 1.8-2.0%;
(2) and (3) increasing the machining allowance: the cutter inspection is added at the position of a rib plate of a welded steel plate, which is in contact with the ship body, and the cutter inspection amount is selected according to the maximum outline size of the casting and is 10-20 mm;
(3) adding a process correction amount: the process correction amount is additionally arranged at the rib plate and is transited to 0 from the two sides of the rib plate to the 300mm deep direction, and the process correction amount is 5-10 mm;
(4) and (3) improving model design: horizontally placing an exhaust steel pipe in the middle of the sand core, winding grass ropes outside the peripheral cutting holes, and drawing the wood model according to the pattern draft of 1: 20-40;
(5) the design of the riser is improved: the riser is designed by a hot section circle method, point casting is arranged on the riser, the width of the riser is more than or equal to 800mm and less than or equal to 1200mm, and the riser is cast once; casting the dead head twice with the width of the dead head of 1200mm < phi > not more than 1600 mm;
(6) and (3) selecting a parting surface: selecting an upper middle surface and a lower middle surface as parting surfaces;
(7) adding cold iron: horizontally placing and hanging sand external chill on the back of the riser;
(8) a pouring system: the rising speed of molten steel is one of important factors for obtaining high-quality castings, proper ladle holes and the number of ladle holes are selected according to gross weight and the maximum height of the castings, and pouring time is calculated as follows: s = Q/nq, wherein: s-pouring time, unit is S, Q-casting gross weight, unit is kg, n-number of ladle holes, unit is number, and Q-unit time includes molten steel flow of the ladle holes, namely the weight of molten steel passing through the ladle holes in the ladle per second.
2. The method for designing a process for making a large marine casting according to claim 1, wherein the linear shrinkage rate of step (1) is selected to be suitable for molding of the water glass self-hardening sand.
3. A process design method for large marine castings according to claim 1, characterized in that step (7) does not use direct chill.
4. The process design method for castings on large ships according to claim 1, wherein in the step (8), the gross weight D of the castings is less than or equal to 5000kg, the molten steel rising speed is 25mm/s, 5000kg < the gross weight D of the castings is less than or equal to 15000kg, the molten steel rising speed is 10mm/s, 15000kg < the gross weight D of the castings is less than or equal to 35000kg, the molten steel rising speed is 8mm/s, 35000kg < the gross weight D of the castings is less than or equal to 55000kg, and the molten steel rising speed is 4 mm/s.
5. The process design method for the large-scale marine upper casting according to any one of claims 1 to 4, characterized in that the process design method is suitable for the upper casting, the lower casting, the upper and lower rudder buttons, the rudder stock bearing and the rudder pintle bearing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112846080A (en) * | 2021-01-05 | 2021-05-28 | 中国第一重型机械股份公司 | Integral casting control method for rudder blade casting for large ship |
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- 2020-03-04 CN CN202010143797.6A patent/CN111390106A/en not_active Withdrawn
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| CN112846080A (en) * | 2021-01-05 | 2021-05-28 | 中国第一重型机械股份公司 | Integral casting control method for rudder blade casting for large ship |
| CN112846080B (en) * | 2021-01-05 | 2022-12-02 | 中国第一重型机械股份公司 | Integral casting control method for rudder blade casting for large ship |
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Application publication date: 20200710 |