CN103144739B - The initiatively manufacture method of divergence type bulbous bow - Google Patents

The initiatively manufacture method of divergence type bulbous bow Download PDF

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Publication number
CN103144739B
CN103144739B CN201310076788.XA CN201310076788A CN103144739B CN 103144739 B CN103144739 B CN 103144739B CN 201310076788 A CN201310076788 A CN 201310076788A CN 103144739 B CN103144739 B CN 103144739B
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bulbous bow
main body
strength
manufacture method
initiatively
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CN103144739A (en
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张乐山
李兵
赵效东
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Jiangsu Hantong Ship Heavy Industry Co Ltd
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Hantong Shanghai New Energy Ship Design Research Development Co ltd
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Publication of CN103144739A publication Critical patent/CN103144739A/en
Priority to PCT/CN2013/080801 priority patent/WO2014139254A1/en
Priority to JP2015504863A priority patent/JP5927598B2/en
Priority to KR1020147019985A priority patent/KR101638376B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/06Shape of fore part
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/06Shape of fore part
    • B63B1/063Bulbous bows
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00Maritime or waterways transport
    • Y02T70/10Measures concerning design or construction of watercraft hulls

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Metal Rolling (AREA)
  • Powder Metallurgy (AREA)
  • Vibration Dampers (AREA)

Abstract

The invention provides a kind of manufacture method of active divergence type bulbous bow, the method includes the steps of: A, selection material: select high strength material; B, forming materials: according to the size and dimension of bulbous bow and main body connecting portion, above-mentioned high strength material is processed into the size and dimension matched; C, installation: at bulbous bow and main body connecting portion, adopt welding, bonding or inlay install above-mentioned high strength material, for connecting bulbous bow and main body; D, grinding process: above-mentioned connecting portion of polishing, make have level and smooth transition to be connected between bulbous bow with main body; E, antirust treatment: adopt sandblasting to prime; F, harmless watertight inspection: watertight inspection be can't harm to bulbous bow and main body connecting portion.Described high strength material is low-alloy high-strength metallic material, and its yield strength value is not less than 390Mpa, and the present invention can reduce the injury that when boats and ships collide, bulbous bow causes the other side's hull.

Description

The initiatively manufacture method of divergence type bulbous bow
Technical field
The present invention relates to a kind of manufacture method of ship components, be specifically related to a kind of manufacture method of active divergence type bulbous bow.
Background technology
Bulbous bow structure for reduction the wave making resistance of high-speed ship and the viscous pressure resistance aspect of low speed boats and ships have original benefit, for a long time, adopt by a large amount of ship design persons, particularly on the design of box ship.But bulbous bow is ship bow part gives prominence to the part of hull, the length of stretching out is very long, in the way of navigation, if it comes in contact with other boats and ships, among the hull that may embed the other side, causes the leakage of the other side's Ship's Cargo.For the boats and ships of class dangerous freights such as oil carrier, chemical carrier and loaded with nuclear fuel, if cabin is crashed through, will inevitably cause the leakage of dangerous freight, this type of accident often causes catastrophic consequence.
Conventional method, collided ship oceangoing ship topside can be thrust in order to solve the above-mentioned bulbous bow stretched out and then cause by the problem of colliding ship's space and breaking, the strength and stiffness mainly passing through to reduce bulbous bow structure that people consider, enable bulbous bow structure that larger distortion occur, reduce the contact force of collision, make bulbous bow structure absorb more collision energy.As following patent documentation the patented method that proposes:
1.US4323026 2.JP8164887 3.DE200510028331
On the one hand; because the rigidity of bulbous bow is generally speaking much larger than by the rigidity of colliding ship topside; by changing version or the size of bulbous bow; make its rigidity be less than by the rigidity of colliding ship topside, the interference preventing method destroyed to realize in collision process bulbous bow active deformation implements difficulty very.Another aspect, because bulbous bow structure needs to bear complicated wave load, if only from crash protection angle, the intensity merely reducing bulbous bow structure can cause its ability of bearing conventional wave load to decline.3rd aspect, if the intensity reducing bulbous bow, so under the load-up condition of routine, bulbous bow structure easily produces permanent plastic deformation, affects the usability of bulbous bow.
The patent No.: another the existing ship collision means of defence involved by JP2004314825, the method is in order to the transverse strength in order to reduce bulbous bow, make bulbous bow easy flexural deformation under transverse load condition, have employed the outer plate material of bulbous bow of the material replacement part of the larger low yield strength of plastic strain, the method is less than the low yield strength material of 235MPa by outer for bulbous bow part plate material being replaced with the lower material of yield strength or yield stress, make boats and ships in non-vertical collision process, bulbous bow can occur bending and deformation than being easier under Moment, more collision energy is absorbed by the distortion of bulbous bow, reduce the damage that bulbous bow causes the other side's boats and ships topside.But this method has following deficiency:
1, portion of material is replaced with the material of low yield strength, reduce the structural strength of bulbous bow, inevitably reduce the ability that bulbous bow structure bears external load.
2, portion of material is replaced with the material of low yield strength, reduce the structural strength of bulbous bow, bulbous bow easily produces expendable plastic deformation under external load function.
3, because the strain of ordinary low-carbon steel breaking limit is very large, after bulbous bow end construction destroys, the structure that bulbous bow is given prominence to still exists, and can not be separated, still can cause subsequent insult to the other side's boats and ships in collision process with main body.
The conventional boats and ships of analysis with bulbous bow and the collision problem of other boats and ships, generally all suppose that other boats and ships are static, the boats and ships with bulbous bow initiatively clash into the so a kind of crash scenario of other boats and ships.But this crash scenario does not meet reality.In actual collision case, two ships generally speaking collided have certain speed of a ship or plane.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of active divergence type bulbous bow, make in the process collided with other boats and ships, the high strength material of bulbous bow and main body junction can occur initiatively to destroy, by the destruction of this kind of high strength material, bulbous bow is separated with main body, avoid bulbous bow to be embedded into by the cabin of collision boats and ships, thus greatly prevent by the destruction of collision ship's space, prevent the leakage of objectionable impurities.。
The present invention solves above-mentioned technical matters by such technical scheme: a kind of manufacture method of active divergence type bulbous bow, and the method includes the steps of:
A, selection material: select high strength material;
B, forming materials: according to the size and dimension of bulbous bow and main body connecting portion, above-mentioned high strength material is processed into the size and dimension matched;
C, installation: at bulbous bow and main body connecting portion, adopt welding, bonding or inlay install above-mentioned high strength material, for connecting bulbous bow and main body;
D, grinding process: above-mentioned connecting portion of polishing, make bulbous bow and main body have level and smooth transition to be connected;
E, antirust treatment: adopt sandblasting to prime;
F, harmless watertight inspection: watertight inspection be can't harm to bulbous bow and main body connecting portion.
Further improvement is, described high strength material is low-alloy high-strength metallic material.
Further improvement is, at bulbous bow outside plate and main body outside plate connecting portion, installs described low-alloy high-strength metallic material.
Further improvement is, the yield strength value of described low-alloy high-strength metallic material is not less than 390Mpa, and the yield strength of this low-alloy high-strength metallic material is greater than the yield strength of the outer plate material of the main body be adjacent and the outer plate material of bulbous bow.
Further improvement is, the thickness of described low-alloy high-strength metallic material is less than the thickness of main body outside plate and the bulbous bow outside plate be adjacent, and the center thickness of described low-alloy high-strength metallic material is less than this low-alloy high-strength metallic material and the main body outside plate be adjacent and bulbous bow outside plate junction thickness.
Further improvement is, described low-alloy high-strength metallic material adopts smooth connection with the main body outside plate be adjacent and bulbous bow outside plate junction.
Further improvement is, the quality proportioning percentum of described low-alloy high-strength metallic material comprises: carbon is not more than 0.2; Silicon is not more than 0.55; Phosphorus is not more than 0.045; Sulphur is not more than 0.045; Vanadium is not more than 0.2; Niobium is not more than 0.06; Thallium is not more than 0.2; Aluminium is not more than 0.7; Chromium is not more than 1.2; Nickel is between 0.45 to 1.5; Manganese is between 1.3 to 1.6.
Further improvement is, the solder flux of described employing welding process is exactly low-alloy high-strength metallic material.
Further improvement is, the quality proportioning percentum of described solder flux comprises: carbon is not more than 0.15; Silicon is not more than 0.8; Phosphorus is not more than 0.03; Sulphur is not more than 0.03; Vanadium is not more than 0.05; Aluminium is not more than 1.8; Chromium equals 0.15; Nickel is between 2 to 2.6; Manganese is between 1.75 to 2.25, and molybdenum is between 0.35 to 0.65.
Further improvement is, described solder flux can substitute low-alloy high-strength metallic material, directly by bulbous bow outside plate and main body outside plate welding fabrication.
The present invention has the following advantages:
High strength material, generally speaking the low-intensity material of its plasticity ratio routine is poor, and fragility is better than the low-intensity material of routine, and along with the raising of intensity, the plasticity of high strength material reduces, and Brittleness is more and more obvious.Further, high strength material, under the strained situation of certain low-intensity material lower than routine, can rupture, and Crack Extension is very fast.The present invention uses this brittle fracture character of high strength material, under the prerequisite not reducing bulbous bow structural strength, utilizes the destruction of high strength material, realizes controlling bulbous bow and is separated with main hull structure, reach the object of ship collision protection.
(1) replacement of bulbous bow place material carries out under the condition not reducing the intensity of bulbous bow own.
(2) prior art is the distortion by nose bow construction energy occurrence of large-area of managing to concede points, the kinetic energy of ship collision is absorbed by the distortion of bulbous bow structure, and the device in the present invention is by making bulbous bow fracture, reduce the length of bulbous bow, thus reduce this aspect of possibility that the bulbous bow stretched out pierces through the cargo hold bulkhead of the other side's boats and ships and realize the protection of colliding.
(3) prior art (patent No.: JP2004314825) is by using the metallic material that yield strength is lower, nose bow construction of managing to concede points easily occured bending and deformation in colliding, and reduced impact contact force by the flexural deformation of bulbous bow structure.And the device in the present invention is by making bulbous bow fracture, reduce the length of bulbous bow, thus reduce this aspect of possibility that the bulbous bow stretched out pierces through the cargo hold bulkhead of the other side's boats and ships and realize the protection of colliding.
Accompanying drawing explanation
The schematic diagram of a kind of active divergence type of Figure 1A bulbous bow structure;
The schematic diagram of a kind of active divergence type of Figure 1B bulbous bow structure;
Fig. 2 A corresponds to the schematic diagram of the A-A horizontal section of Figure 1A;
Fig. 2 B corresponds to the schematic diagram of the A-A horizontal section of Figure 1B;
Fig. 3 A corresponds to the schematic diagram of the B-B horizontal section of Figure 1A;
Fig. 3 B corresponds to the schematic diagram of the B-B horizontal section of Figure 1B;
Fig. 4 is divergence type bulbous bow structure level C-C generalized section initiatively;
The horizontal C-C section of Fig. 5 active divergence type bulbous bow structure, D region partial enlarged view;
Fig. 6 ship collision schematic diagram;
Fig. 7 is divergence type bulbous bow collision effect schematic diagram initiatively;
Fig. 8 manufacturing approach craft diagram of circuit of the present invention.
In figure: 1. main body 2. by colliding ship cargo hold district 3. by colliding ship shell
4. by colliding ship longitudinal bulkhead 5. bulbous bow 6. bulbous bow outside plate 7. high strength material
8. the horizontal frame-generic of the horizontal strong frame of main body outside plate 9. 10.
Detailed description of the invention
Embodiment one:
Hereafter will be described in detail this active divergence type bulbous bow, and comprise and use high strength material to replace common low-carbon steel material.This high strength material has certain characteristic, and these characteristics comprise: yield strength is high, obvious fragility, low breaking strain value.
Hull uses initiatively divergence type bulbous bow, greatly can reduce the threat of bulbous bow for the other side's boats and ships.In high-octane knockout process, occur by making this section of high strength material to destroy and realize bulbous bow and live hull and be separated, reducing the destruction of bulbous bow for opponent vessel hull structure; In low-energy knockout process, high strength material is in elastic range substantially, and the distortion of bulbous bow can return to its original shape substantially, and keeps enough integratys, to resist later shock.
Particularly see accompanying drawing, Figure 1A and Figure 1B is according to the schematic diagram of kind of the active divergence type bulbous bow structure of two designed by technical solution of the present invention, as shown in FIG. 1A and 1B: wherein black region part 7 is high strength material 7, the form of all the other structures and size can be determined according to existing Ship Construction Rules.
The principle that the thickness of high strength material 7 is replaced according to material equal strength is determined, as: the bulbous bow outside plate 6 of thickness of slab to be the yield strength of 18mm be 235MPa under regular situation, replace with the high strength material plate 7 that yield strength is 690MPa, thickness of slab can elect (18 × 235) ÷ 690=6.13 (mm) as just can meet preliminary requirement of strength.
High strength material 7 is along the yardstick of captain direction (longitudinal direction):
This ship rib distance is L 0, the longitudinal length of high strength material 7 can be (1% ~ 100%) × L 0.
Longitudinal position of high strength material 7: before high strength material 7 is arranged in collision bulkhead, preferably be arranged in the front end of the horizontal strong frame 9 of bulbous bow inside, concrete position can be determined according to the requirement of the position of transcerse bulkhead and use, as shown in Figure 1, this high strength material 7 is arranged in the front of horizontal strong frame 9.
The welding transition of high strength material 7 and conventional hull material: the stress of the plate junction caused in order to the change prevented due to thickness of slab is concentrated, and ensure will seamlessly transit between different-thickness plate, the techniques such as polishing can be adopted to make weld flat smooth.
Be below the chemical composition of several groups of alternative low-alloy high-strength materials, but it should be noted that the alternative high strength material of the present invention is not limited to listed several groups.
Table 1: the chemical composition quality proportioning percentum of several groups of low-alloy high-strength materials
Be below the mechanical property of above-mentioned several groups of alternative low-alloy high-strength materials, but it should be noted that the alternative high strength material of the present invention is not limited to listed several groups.
Table 2: the mechanical property of several groups of low-alloy high-strength materials
They be below several alternative solder flux and welding methodes being applicable to weld above-mentioned high strength material, but it is listed several to it should be noted that the alternative solder flux for welded high-strength material of the present invention and welding method are not limited to.
Table 3: selectable prior art solder flux
Select one group of above-mentioned low-alloy high-strength material and the welding method of correspondence, and use above-mentioned installation method, those of ordinary skill in the art can know and realize technical solutions according to the invention easily.
Embodiment two:
For realizing the technical scheme described in this patent, a kind of more succinct replacement scheme is: main body outside plate and bulbous bow outside plate are linked together with high strength material solder flux of the present invention.Because solder flux itself has had the various mechanical properties of low-alloy high-strength material, so, can not need completely to select suitable low-alloy high-strength material, do not need manufacture shaping, but directly with high strength material solder flux of the present invention, existing main body outside plate and bulbous bow outside plate weld together can be played identical fragility initiatively fracture property yet.
Be below alternative several groups of low-alloy high-strength material solder flux of the present invention, but it should be noted that the present invention's alternative high strength material solder flux is not limited to listed several groups.
Table 4: the chemical composition quality proportioning percentum of several groups of low-alloy high-strength material solder flux of the present invention
Table 5: the mechanical property that above-mentioned several low-alloy high-strength material solder flux of the present invention is corresponding
Group Yield strength/MPa Tensile strength/MPa Percentage elongation/%
1 ≥400 490~620 ≥20
2 ≥470 550~690 ≥19
3 ≥610 690~830 ≥16
4 ≥680 760~900 ≥15
Select arbitrary group of above-mentioned low-alloy high-strength material solder flux of the present invention, and use above-mentioned installation method, those of ordinary skill in the art can know and realize technical solutions according to the invention easily.
Embodiment three:
At bulbous bow outside plate and main body outside plate connecting portion, also described low-alloy high-strength metallic material partly can be installed.As shown in Figure 1B, the top and the bottom of described low-alloy high-strength metallic material adopt arranged in dislocation mode also can, it is low-alloy high-strength metallic material that the A-A of Fig. 2 B clearly indicates upper part material to cutaway view, and lower part material is the outer plate material of existing bulbous bow; At bulbous bow outside plate and main body outside plate connecting portion, also can adopt interval that the mode of described low-alloy high-strength metallic material is installed, not shown.
As Fig. 6, according to the active divergence type bulbous bow 5 that above-mentioned method manufactures, when ship collision occurs, bulbous bow 5 with come in contact by colliding ship cargo hold district 2, because main body 1 exists certain speed of a ship or plane, bulbous bow 5 can clash into and be made being deformed by colliding ship shell 3 of cargo hold district 2 by the topside in colliding ship cargo hold district 2.Owing to also be there is certain speed forward by colliding ship cargo hold district 2, along by the direct of travel in colliding ship cargo hold district 2, bulbous bow 5 has relative motion with by the topside in colliding ship cargo hold district 2.On the one hand because bulbous bow 5 is embedded into by among colliding ship shell 3, relative sport causes there is a push effect by colliding ship shell 3 pairs of bulbous bows 5; Bulbous bow 5 is made to bear huge moment of flexure and horizontal shearing; On the other hand, there is relative motion, there is sizable friction force therebetween due to bulbous bow 5 and by between colliding ship shell 3, the effect of friction force makes bulbous bow 5 structure bear very large shearing.
When the energy comparison collided is large, because the plate at high strength material 7 place is thinner than adjacent sheet metal thickness, the stress amplitude ratio of this position is larger, when the stress of this position reaches the fracture stress of this high strength material, the structure at this place ruptures, high strength material 7 structure occurs to destroy rapidly, and the tip of the bulbous bow 5 of collision boats and ships 1 realizes quick separating with the main hull structure of collision boats and ships.
As Fig. 7, due to main body 1 with still existed by the relative motion in colliding ship cargo hold district 2, the front end of bulbous bow 5 can by under the effect of colliding ship shell 3, move together along with by colliding ship shell 3, then depart from the main body outside plate 8 of main body 1, thus realize bulbous bow 5 and be separated with the main body of main body 1.
If now main body 1 also exists the larger speed of a ship or plane, move forward, continue to act on by colliding ship cargo hold district 2.This time, due to the contraction in length of bulbous bow 5, and the area of two ship contact interfaces increases, and the front end of bulbous bow 5 embeds and greatly reduced by the possibility in colliding ship cargo hold district 2, thus the destruction of collided vessel oceangoing ship longitudinal bulkhead 4 can be avoided, play the effect of collision protection.
The foregoing is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned embodiment; in every case those of ordinary skill in the art modify or change according to the equivalence that disclosed content is done, and all should include in the protection domain recorded in claims.

Claims (10)

1. a manufacture method for active divergence type bulbous bow, the method comprises the following steps:
A, selection material: select high strength material;
B, forming materials: according to the size and dimension of bulbous bow and main body connecting portion, above-mentioned high strength material is processed into the size and dimension matched;
C, installation: at bulbous bow and main body connecting portion, adopt welding, bonding or inlay install above-mentioned high strength material, for connecting bulbous bow and main body;
D, grinding process: above-mentioned connecting portion of polishing, make bulbous bow and main body have level and smooth transition to be connected;
E, antirust treatment: adopt sandblasting to prime;
F, harmless watertight inspection: watertight inspection be can't harm to bulbous bow and main body connecting portion.
2. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 1, is characterized in that: described high strength material is low-alloy high-strength metallic material.
3. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 2, is characterized in that: at bulbous bow outside plate and main body outside plate connecting portion, install described low-alloy high-strength metallic material.
4. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 3, it is characterized in that: the yield strength value of described low-alloy high-strength metallic material is not less than 390Mpa, the yield strength of this low-alloy high-strength metallic material is greater than the yield strength of the outer plate material of the main body be adjacent and the outer plate material of bulbous bow.
5. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 3, it is characterized in that: the thickness of described low-alloy high-strength metallic material is less than the thickness of main body outside plate and the bulbous bow outside plate be adjacent, and the center thickness of described low-alloy high-strength metallic material is less than this low-alloy high-strength metallic material and the main body outside plate be adjacent and bulbous bow outside plate junction thickness.
6. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 5, is characterized in that: described low-alloy high-strength metallic material adopts smooth connection with the main body outside plate be adjacent and bulbous bow outside plate junction.
7. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 2, is characterized in that: the quality proportioning percentum of described low-alloy high-strength metallic material comprises: carbon is not more than 0.2; Silicon is not more than 0.55; Phosphorus is not more than 0.045; Sulphur is not more than 0.045; Vanadium is not more than 0.2; Niobium is not more than 0.06; Thallium is not more than 0.2; Aluminium is not more than 0.7; Chromium is not more than 1.2; Nickel is between 0.45 to 1.5; Manganese is between 1.3 to 1.6.
8. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 3, is characterized in that: the solder flux of described employing welding process is exactly low-alloy high-strength metallic material.
9. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 8, is characterized in that: the quality proportioning percentum of described solder flux comprises: carbon is not more than 0.15; Silicon is not more than 0.8; Phosphorus is not more than 0.03; Sulphur is not more than 0.03; Vanadium is not more than 0.05; Aluminium is not more than 1.8; Chromium equals 0.15; Nickel is between 2 to 2.6; Manganese is between 1.75 to 2.25, and molybdenum is between 0.35 to 0.65.
10. the manufacture method of initiatively divergence type bulbous bow as claimed in claim 9, is characterized in that: described solder flux can substitute low-alloy high-strength metallic material, directly by bulbous bow outside plate and main body outside plate welding fabrication.
CN201310076788.XA 2013-03-11 2013-03-11 The initiatively manufacture method of divergence type bulbous bow Active CN103144739B (en)

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Application Number Priority Date Filing Date Title
CN201310076788.XA CN103144739B (en) 2013-03-11 2013-03-11 The initiatively manufacture method of divergence type bulbous bow
PCT/CN2013/080801 WO2014139254A1 (en) 2013-03-11 2013-08-05 Method for manufacturing actively separable bulbous bow
JP2015504863A JP5927598B2 (en) 2013-03-11 2013-08-05 Manufacturing method of main-separation type spherical bow
KR1020147019985A KR101638376B1 (en) 2013-03-11 2013-08-05 Method for Manufacturing Automatically Detachable Bulbous Bow

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KR101638376B1 (en) 2016-07-11
JP2015517951A (en) 2015-06-25

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