JP5927598B2 - Manufacturing method of main-separation type spherical bow - Google Patents

Description

  The present invention relates to a method for manufacturing a ship member, and specifically to a method for manufacturing a main dynamic separation type spherical bow.

  The spherical bow structure has particular advantages in reducing wave-making resistance due to high-speed vessels and sticky pressure resistance due to low-speed vessels, so it has been adopted by many ship designers, especially for container ship designs. There are many. However, the spherical bow is a part of the bow that protrudes from the hull, and its extended length is considerably long.If it touches another ship during navigation, it will fit into the target hull and Cargo leaks. For ships designed to carry dangerous cargo such as crude oil, chemicals and nuclear fuel, if the bulkhead of the ship hits and is destroyed, the dangerous cargo will leak and in this case will cause disaster consequences There are many.

  As a conventional method, in order to solve the problem that the elongated spherical bow is inserted into the side of the impacted ship and the bulkhead of the impacted ship is torn, the strength and rigidity of the structure of the spherical bow is reduced and the spherical bow is reduced. Can be greatly deformed, the contact force of the collision can be reduced, and the structure of the spherical bow can absorb the energy of further collision.

US4323026 JP8164887 DE200510028331

  On the other hand, the rigidity of the spherical bow is generally much larger than the rigidity of the ship side of the impacted ship, and by changing the structure type or dimensions of the spherical bow, the rigidity becomes smaller than the rigidity of the ship side of the impacted ship. In addition, a collision protection method due to deformation of the spherical bow in the collision process becomes extremely difficult.

  On the other hand, since the structure of the spherical bow needs to be subjected to a complicated wave load, the ability to receive the wave load is reduced by reducing the structural strength of the spherical bow only from the angle of collision protection. Further, when the strength of the spherical bow is reduced, the spherical bow structure easily undergoes permanent plastic deformation under normal load conditions, which affects the usability of the spherical bow.

  In the conventional ship collision protection method according to Patent No. JP2004314825, the spherical bow tends to be bent and deformed by a lateral load so as to reduce the lateral strength of the spherical bow, and instead of a part of the outer material of the spherical bow. In this case, a low yield strength material having a large plastic strain is used, and the method replaces the outer material of the spherical bow with a low yield strength material or a low yield material having a yield stress of less than 235 MPa. The spherical bow of the ship is easily bent and deformed by the action of torque, and the deformation of the spherical bow absorbs more collision energy and reduces the damage of the spherical bow to the target ship. However, this method has the following shortcomings.

(1) Replace a part of the material with a material having low yield strength, reduce the structural strength of the spherical bow, and reduce the ability of the spherical bow structure to receive external loads.
(2) A part of the material is replaced with a material having low yield strength, and the structural strength of the spherical bow is reduced, so that the plastic deformation that the spherical bow cannot recover by external load is easily generated.
(3) The fracture extreme strain of ordinary low-carbon steel is considerably large, and after the end structure of the spherical bow breaks down, the protruding structure of the spherical bow still exists, does not leave the hull body, and remains in the collision process Continue to damage the ship.

  Regular analysis has a collision problem between a spherical bow vessel and another vessel. Generally, if another vessel is stationary, a vessel with a spherical bow collides with another vessel. Belongs to the situation. However, such a collision situation does not really match. In an actual collision accident, in general, both the ships that collide have a constant navigation speed.

  In the present invention, in the process of colliding with another ship, the high-strength material at the joint between the spherical bow and the hull main body is destroyed dynamically, and the hull main body is separated from the spherical bow due to the breakage of such high-strength material. It is another object of the present invention to provide a method for manufacturing a main dynamic separation type spherical bow capable of preventing the spherical bow from being fitted into the bulkhead of the collided ship and greatly preventing destruction of the collided ship.

  In order to solve the above-described problems, the present invention provides a material selection step for selecting a high-strength material and the high-strength material corresponding to the size and shape of the connecting portion between the spherical bow and the hull body. A material molding process for processing into a size and a shape, an attachment process for connecting the spherical bow and the hull body, and attaching the high-strength material to the connection part between the spherical bow and the hull body by a process of welding, pasting and fitting, and the connection Grinding the part, connecting the spherical bow and the hull body so as to make a smooth transition, the rust prevention treatment process adopting shot blasting and coating, and the connection part between the spherical bow and the hull body are lossless And a non-damaged watertight inspection for performing a watertight inspection.

The high-strength material is preferably a low alloy high-strength metal material.
It is preferable to attach the low alloy high-strength metal material to the connection portion between the outer plate of the spherical bow and the outer plate of the hull body.
The yield strength of the low-alloy high-strength metal material is 390 MPa or more, and the yield strength of the low-alloy high-strength metal material is higher than the yield strength of the outer shell material of the hull body and the outer bow material of the spherical bow. It is preferable that it is large.

  The thickness of the low alloy high strength metal material is smaller than the thickness of the outer plate of the hull body adjacent to it and the outer plate of the spherical bow, the thickness at the center of the low alloy high strength metal material is It is preferable that the thickness is smaller than the thickness at the connecting portion of the low alloy high strength metal material and the outer plate of the hull main body and the outer plate of the spherical bow.

It is preferable that the low alloy high-strength metal material, the outer shell of the hull body adjacent thereto, and the connecting portion of the outer shell of the spherical bow are connected in a smooth manner.
The mass percentage of the low alloy high-strength metal material is as follows: C is 0.2 or less, Si is 0.55 or less, P is 0.045 or less, S is 0.045 or less, V is 0.2 or less, Nb is 0.06 or less, Ti is 0.2 or less, and Al is 0.7. Hereinafter, it is preferable to provide that Cr is 1.2 or less, Ni is between 0.45 and 1.5, and Mn is between 1.3 and 1.6.

The solvent used in the welding process is preferably a low alloy high strength metal material.
The weight percentage of the solvent is: C is 0.15 or less, Si is 0.8 or less, P is 0.03 or less, S is 0.03 or less, V is 0.05 or less, Al is 1.8 or less, Cr is 0.15 or less, and Ni is between 2 and 2.6. Preferably, Mn is between 1.75 and 2.25.

  It is preferable that the solvent is welded directly to the connecting portion of the outer plate of the spherical bow and the outer plate of the hull body instead of the low alloy high strength metal material.

  In accordance with the present invention, high strength materials generally have poorer plasticity than conventional low strength materials and are more brittle than conventional low strength materials, and as the strength increases, the plasticity of high strength materials decreases and brittleness increases. There is an advantage that the features become increasingly clear. In the case of a high-strength material, when the strain is lower than that of a normal low-strength material, the high-strength material breaks and the crack develops quickly. The present invention controls the separation of the spherical bow and the hull body using the fracture of the high-strength material on the premise that the structural strength of the spherical bow is not reduced by using the brittle fracture property of the high-strength material. The purpose of ship collision protection can be achieved.

(1) Material replacement at the spherical bow is performed under the condition that the strength of the spherical bow itself is not reduced.
(2) The prior art is designed to greatly deform the structure of the spherical bow and absorb the kinetic energy of the ship collision by the deformation of the structure of the spherical bow. By reducing the length of the bow, it is possible to reduce the possibility that the protruding spherical bow will be inserted into the bulkhead of the target ship, and to realize the collision protection purpose.
(3) The conventional technology (patent number: JP2004314825) uses a metal material with low yield strength, so that the structure of the spherical bow easily curves and deforms during the collision process, and collides with the curved deformation of the spherical bow. The contact force is reduced. The present invention breaks the spherical bow and reduces the length of the spherical bow, thereby reducing the possibility that the protruding spherical bow is inserted into the bulkhead of the target ship and realizing the collision protection purpose.

FIG. 1A is a schematic view of a main dynamic separation type spherical bow structure. FIG. 1B is a schematic diagram of a main dynamic separation type spherical bow structure. FIG. 2A is a schematic view corresponding to the AA lateral cross section of FIG. 1A. FIG. 2B is a schematic view corresponding to the AA lateral cross section of FIG. 1A. FIG. 3A is a schematic view corresponding to the BB transverse section of FIG. 1A. FIG. 3B is a schematic view corresponding to the BB lateral cross section of FIG. 1A. FIG. 4 is a horizontal CC cross-sectional schematic view of a main-drive main-drive separation type spherical bow structure. FIG. 5 is a horizontal CC cross-section and D region enlarged view of a main-drive main-separation type spherical bow structure. FIG. 6 is a schematic view of a ship collision. FIG. 7 is a schematic view of a collision effect of a main-motion main-motion separation type spherical bow. FIG. 8 is a flowchart of a manufacturing method process according to the present invention.

Example 1 Hereinafter, such a main-separation type spherical bow will be described in detail, and it is also possible to use a high-strength material instead of ordinary low-carbon steel. Such high-strength materials have certain properties, and these special features provide yield strength, high brittleness, and low fracture strain.

  When the main dynamic separation type spherical bow is used for the hull, the influence of the spherical bow on the ship can be greatly reduced. The high-strength material breaks off the high-strength material to separate the spherical bow and hull body to reduce the breakage of the spherical bow against the ship. In the elastic range, the deformation of the spherical bow can be restored to its original shape, and sufficient consistency can be maintained so as to resist the subsequent collision.

  Referring specifically to the drawings, FIGS. 1A and 1B are schematic diagrams showing the structures of two types of main dynamic separation type spherical bows according to the technical solution of the present invention, as shown in FIGS. 1A and 1B. The region portion 7 is a high strength material 7 and other types and dimensions are determined by conventional ship building codes.

  The thickness of the high-strength material 7 is determined by the principle of replacing the strength of the material.For example, in the normal case, the outer plate 6 of the spherical bow having a yield strength of 235 MPa with a thickness of 18 mm is obtained, and the yield strength is 690 MPa. If the plate thickness is selected as (18 × 235) ÷ 690 = 6.13 (mm), the first strength requirement is satisfied.

The dimensions of the high-strength material 7 along the ship length direction (longitudinal direction) are such that the ship rib interval is L ₀ and the length of the high-strength material 7 in the vertical direction is (1% to 100%) × L ₀ .
The longitudinal arrangement position of the high-strength material 7 is preferably provided at the tip of the lateral reinforcement frame 9 inside the spherical bow before the high-strength material 7 is provided in the collision prevention partition wall, and the specific position is The high strength material 7 is provided in front of the lateral reinforcing frame 9, as shown in FIG.

The welding transition between the high-strength material 7 and the regular hull material needs to guarantee a smooth transition between different plate thicknesses in order to prevent stress concentration at the plate joints due to changes in plate thickness. The weld site can be flat and smooth in the process.
The following are the chemical components of several sets of selected low alloy high strength materials, but the selected high strength materials of the present invention are not limited to the several sets listed.

  The following is the mechanical performance of the several sets of selected low alloy high strength materials, but the selected high strength materials of the present invention are not limited to the several sets listed.

  The following are solvents and welding methods that apply to the welding of several types of the selected high strength materials, but the solvents and welding methods for welding selected high strength materials of the present invention are listed. It is not limited to several types.

  A person skilled in the art can easily realize the technical solution according to the present invention by selecting the set of low-alloy high-strength materials and the corresponding welding methods and using the mounting method.

Example 2 In order to realize the technical plan according to the present application, as a further simple replacement plan, it is conceivable to connect the outer plate of the hull body and the spherical bow with the high-strength material solvent of the present invention. Since the solvent itself already has the mechanical performance of each of the low alloy high strength materials, there is no need to select an appropriate low alloy high strength material, no need for production molding, and direct use with the high strength material solvent of the present invention. If the outer plate of the hull body and the outer plate of the spherical bow are welded together, the same brittle main dynamic tearing performance is achieved.

  The following are selected sets of low alloy high strength material solvents of the present invention, and selected high strength material solvents according to the present invention are not limited to the listed several sets.

  A person skilled in the art can easily realize the technical solution according to the present invention by selecting any one of the above-described low-alloy high-strength material solvents according to the present invention and using the mounting method described above.

Example 3 The low alloy high-strength metal material may be attached to only a part of the connection portion between the outer plate of the spherical bow and the hull body. As shown in FIG. 1B, the upper and lower parts of the low alloy high-strength metal material may be attached by a dislocation mounting method, and the upper part material is a low alloy high-strength metal in the AA cross-sectional arrow view of FIG. 2B. It clearly shows that the lower part material is the outer plate material of the conventional spherical bow, and the low alloy high strength can be obtained by installing the gap between the outer plate of the spherical bow and the outer plate of the hull body. A method of attaching a metal material may be employed, which is not shown.

  As shown in FIG. 6, with respect to the main dynamic separation type spherical bow 5 manufactured by the method described above, when a ship collision occurs, the spherical bow 5 comes into contact with the cargo area 2 of the ship to be collided, and the hull Since the main body 1 has a constant navigation speed, the spherical bow 5 collides with the ship side of the cargo area 2 of the collision ship, and the housing 3 of the collision ship in the ship cargo area 2 is deformed. The cargo area 2 of the impacted ship also has a certain forward speed, so that the spherical bow 5 and the ship side of the cargo area 2 of the impacted ship are relative to each other along the forward direction of the cargo area 2 of the impacted ship. Will generate the movement. On the other hand, since the spherical bow 5 is fitted into the housing 3 of the impacted ship, the push motion of the impacted ship's housing 3 with respect to the spherical bow 5 occurs due to relative movement, and the spherical bow 5 has a huge torque and lateral shear. On the other hand, there is a relative motion between the spherical bow 5 and the housing 3 of the impacted ship, and there is a considerable friction force between them, and the effect of the friction force is the structure of the spherical bow 5 Is to receive a considerably large shear force.

  When the energy of the collision is large, the thickness of the plate at the high strength material 7 is thinner than the adjacent plate, and when the stress at the position is large, when the stress at the position reaches the breaking stress of the high strength material, The structure at the position is torn, the structure of the high-strength material 7 is quickly broken, and the tip of the spherical bow 5 of the collision ship 1 and the hull body structure of the collision ship are quickly separated.

  As shown in FIG. 7, there is still relative movement between the hull body 1 and the cargo area 2 of the impacted ship, and the tip of the spherical bow 5 moves together with the housing 3 of the impacted ship due to the action of the housing 3 of the impacted ship. Thereafter, the outer plate 8 of the hull main body 1 of the hull main body 1 is separated, and separation of the spherical bow 5 and the hull main body of the hull main body 1 is achieved.

  At this time, the hull body 1 still has a high navigation speed, continues to move forward, and continues to act on the cargo area 2 of the collision ship. At this time, since the length of the spherical bow 5 is reduced and the area of the contact boundary surface between the two ships is increased, the possibility that the tip of the spherical bow 5 is fitted into the cargo area 2 of the collision ship is greatly reduced. Thus, the vertical bulkhead 4 of the ship to be collided is prevented from being destroyed and the collision protection function is obtained.

  The above is a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above-described embodiment, and those skilled in the art will understand that any modifications according to the contents posted in the present invention are described in the claims. Should fit in.

1: Hull body
2: Cargo area of the impacted ship
3: Housing of the impacted ship
4: Longitudinal bulkhead of the impacted ship
5: Spherical bow
6: Spherical bow skin
7: High strength material
8: Hull body skin
9: Lateral reinforcement frame
10: Horizontal normal frame

Claims (9)

As a metal material, a material selection step for selecting a high strength material whose yield strength is larger than the yield strength of the outer plate material of the hull body and the outer plate material of the spherical bow ,
A material molding step of processing the high-strength material into a corresponding size and shape according to the size and shape of the connecting portion between the spherical bow and the hull body,
Attaching the high-strength material to the connecting portion between the spherical bow and the hull body by a welding and fitting process, and connecting the spherical bow and the hull body;
Polishing the connection part, polishing processing step for connecting the spherical bow and the hull body so as to make a smooth transition,
Rust prevention treatment process that uses shot blasting and coating,
A method for manufacturing a main dynamic separation type spherical bow. The high strength material, I low alloy high strength metal material der,
The low-alloy high-strength metal material has a mass percentage of C of 0.2 or less, Si of 0.55 or less, P of 0.045 or less, S of 0.045 or less, V of 0.2 or less, Nb of 0.06 or less, Ti of 0.2 or less, Al 2. The method for producing a main dynamic separation type spherical bow according to claim 1, wherein : 0.7 or less, Cr is 1.2 or less, Ni is between 0.45 and 1.5, and Mn is between 1.3 and 1.6 .   3. The method of manufacturing a main dynamic separation type spherical bow according to claim 2, wherein the low alloy high-strength metal material is attached to a connection portion between the outer plate of the spherical bow and the outer plate of the hull body.   4. The method for manufacturing a main dynamic separation type spherical bow according to claim 3, wherein the yield strength of the low alloy high strength metal material is 390 MPa or more. The thickness of the low-alloy high-strength metal material is smaller than the thickness of the outer shell of the hull body adjacent to it and the outer shell of the spherical bow,
The thickness at the center of the low alloy high-strength metal material is smaller than the thickness at the connection portion between the low alloy high-strength metal material and the outer shell of the hull body and the outer plate of the spherical bow, which are adjacent to the low-alloy high-strength metal material. 4. A method for manufacturing a main dynamic separation type spherical bow according to claim 3.   6. The method of manufacturing a main dynamic separation type spherical bow according to claim 5, wherein the low alloy high-strength metal material and the connecting portion between the outer shell of the hull body and the outer shell of the spherical bow that are adjacent to each other are connected in a smooth manner. .   4. The method for producing a main dynamic separation type spherical bow according to claim 3, wherein the solvent used in the welding process is a low alloy high strength metal material. The weight percentage of the solvent is: C is 0.15 or less, Si is 0.8 or less, P is 0.03 or less, S is 0.03 or less, V is 0.05 or less, Al is 1.8 or less, Cr is 0.15 or less, and Ni is between 2 and 2.6. The method of manufacturing a main dynamic separation type spherical bow according to claim 7 , wherein Mn is between 1.75 and 2.25. 9. The method of manufacturing a main dynamic separation type spherical bow according to claim 8 , wherein the solvent directly welds a connecting portion between the outer plate of the spherical bow and the outer plate of the hull body instead of the low alloy high strength metal material.

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