KR101638376B1 - Method for Manufacturing Automatically Detachable Bulbous Bow - Google Patents

Abstract

The present invention provides a method of manufacturing an automatic detachable spherical athlete comprising the steps of: A selecting a material: selecting a high strength material; B, material forming: processing the high-strength material into a size and shape corresponding to the size and shape of the spherical athlete and the main hull connecting portion; C, Installation: The high-strength material is installed at the connection between the spherical athlete and the main hull through welding, joining or inserting process, connecting the spherical athlete with the main hull; D, sanding treatment: sandwiching the connecting portion to smoothly connect the spherical athlete and the main hull; E, Rust Prevention Treatment: Sandblasting method is used for priming; F, Watertight Nondestructive Inspection: This involves the non-destructive inspection of the watertightness of the connection between the ball and the main hull. The high strength material is a low alloy high strength metal material and has a yield strength value of 390 MPa or more, and the present invention reduces the damage to the opponent ship during a ship collision.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing an automatic detachable bulb bow,

The present invention relates to a ship part, and more particularly, to a method of manufacturing an automatic separation type spherical athlete.

Since the spherical aisle structure has a unique advantage in terms of reducing the wave resistance of a high speed ship and the viscous resistance of a low speed ship, it has been used by many ship designers for a long time and has been widely used in the design of container ships. However, the projected length is very long because the bulb is part of the hull protruding from the bow. If collision occurs with another ship when driving, it may be stuck in the hull of the other ship and exposure of the cargo on the other ship may occur. Therefore, when the cabin of a ship loaded with dangerous goods such as oil tankers, chemical carriers, and nuclear fuels is destroyed by collision, dangerous goods are exposed and these accidents often cause serious disasters.

In the conventional method, in order to solve the problem that the projected spherical athlete is buried in the side of the collided ship and the cabin of the collided ship is ruptured, what people consider is mainly to lower the strength and stiffness of the spherical athlete structure, A relatively large deformation is generated, thereby lowering the contact force at the time of impact, and allowing the spherical aisle structure to absorb more impact energy. For example, it is the same as the patent method presented in the following patent document.

1.US4323026 2.JP8164887 3.DE200510028331

First, the stiffness of the spherical athlete is generally larger than the stiffness of the side of the impacted ship, and the stiffness of the spherical athlete is lowered than the stiffness of the side of the collided ship by changing the structure type and size of the spherical athlete. It is very difficult to carry out a method of automatically protecting the vehicle from deformation and collision. Secondly, since the ball design has to withstand a very complex wave load, if you simply lower the strength of the spherical athlete structure, starting from the position of protection from collision, it lowers your ability to withstand normal wave loads. Thirdly, if the strength of the spherical athlete is lowered, the spherical aisle structure under the normal loading condition tends to cause permanent plastic deformation and affects the use of the spherical athlete.

The patent number JP2004314825 relates to another type of conventional collision protection method which is to reduce the lateral strength of the spherical athlete so that the spherical athlete is easily deformed under the lateral load conditions, The method of this study was to replace the outer shell material of the spherical athlete part with a material with relatively low yield strength or a resistance material with a yield stress of 235 MPa or less, The bending moment of the spherical athlete causes the bending deformation relatively easily and absorbs more impact energy due to the deformation of the spherical athlete so that the spherical athlete reduces the damage to the other side of the ship. However, this method has the following disadvantages.

1. Partial material was replaced by resistive abdominal wall material, which reduced the structural strength of the spherical athlete and inevitably reduced the ability of the spherical athlete's structure to withstand external loads.

2. Partial material is replaced with material of resistance abdominal wall, so that the structural strength of spherical athlete is lowered and plastic spheroid is prone to plastic deformation which can not be recovered by action of external load.

3. The fracture marginal strains of general low carbon steel are so large that even after the spherical fore end structure is destroyed, the bulb projecting structure still exists and is not separated from the main hull, and still causes subsequent damage to the other ship in the collision process.

In analyzing the collision problem between a ship equipped with a contestant and another vessel, it is generally assumed that a vessel equipped with a contestant competes with other vessels while the other vessel is stopped. However, this conflict situation is not consistent with reality. In an actual crash, both vessels, which usually collide, are all traveling at a constant speed.

It is an object of the present invention to provide a method and apparatus for colliding a high strength material at a joint portion between a spherical athlete and a main hull at the time of collision with another ship, The present invention also provides a method of manufacturing an automatic detachment type spherical athlete which prevents the cabin of a collided ship from being broken and prevents the exposure of harmful substances.

In order to achieve the above object, a method of manufacturing an automatic separable spherical athlete of the present invention includes the following steps.

A. Material selection: High strength material is selected;

B. Material shaping: processing the high strength material into a size and shape conforming to the size and shape of the spherical athlete and the main hull connecting portion;

C. Installation: The high-strength material is welded, joined, or inserted, and the spherical athlete is connected to the main hull by installing the high-strength material at the joint between the spherical athlete and the main hull;

D. Sanding treatment: sandwiching the connecting portion to smoothly connect the spherical athlete and the main hull;

E. Rust Prevention Treatment: Sandblasting method is used for priming;

F. Non-destructive inspection of watertightness: Nondestructive inspection shall be carried out on the watertightness of the connecting part between the spherical athlete and the main hull.

As a progressive improvement, the high strength material is a low alloy high strength metal material.

As a further improvement, the low-alloy high-strength metal material is provided at the connection portion between the outer shell of the bulb shell and the outer shell of the primary hull.

As a further improvement, the yield strength value of the low alloy high strength metal material is more than 390 MPa, and the yield strength of the low alloy high strength metal material is larger than the yield strength of the adjacent primary hull sheathing material and bulb outer sheathing material.

As a further improvement, it is preferable that the thickness of the low alloy high strength metal material is thinner than the thicknesses of the adjacent main sheathing shell and outer shell plating, and the thickness of the center portion of the low alloy high strength metal material is smaller than the thickness of the low alloy high strength metal material, Is thinner than the thickness of the connecting portion of the outer shell of the bulb.

As a further improvement, the low alloy high-strength metal material and the adjacent main hull plating and the spherical fore and aft shell connection portions are smoothly connected.

As a further improvement, the percentage mass ratio of the low alloy high strength metal material is not more than 0.2 carbon, not more than 0.55 silicon, not more than 0.045 but less than 0.045 sulfur, not more than 0.045 sulfur, vanadium not more than 0.2, niobium not more than 0.06, thallium not more than 0.2, , Between 0.45 and 1.5 nickel, and between 1.3 and 1.6 manganese.

As a progressive improvement, the welding solvent used in the welding process is a low alloy high strength metal material.

As a further improvement, the percentage mass ratio of the welding solvent is 0.15 or less carbon, 0.8 or less of silicon, 0.03 or less of phosphorus, 0.03 or less of sulfur, 0.05 or less of vanadium, 1.8 or less of aluminum, 0.15 or less of chromium, 2 to 2.6 nickel, 2.25, and molybdenum 0.35 to 0.65.

As a further improvement, the welding solvent can be formed by directly welding the spherical shell outer shell and the outer shell of the primary shell in place of the low alloy high strength metal material.

The present invention has the following advantages.

High strength materials are generally lower in firing than conventional low strength materials, but the brittleness is higher than that of ordinary low strength materials, and as the strength is increased, the firing of high strength materials is lowered and the brittle characteristics become more remarkable. Further, the high-strength material is broken under a certain stress condition lower than that of a normal low-strength material, and the crack spreads quickly. The present invention utilizes such brittle fracture characteristics of a high strength material to realize separation of a spherical athlete and a main hull structure by destruction of a high strength material under the premise that the strength of the spherical aisle structure is not reduced, To achieve the purpose of.

(1) Replace the spherical athletic site material under conditions that do not reduce the strength of the spherical athlete itself.

(2) The conventional technique is to absorb a collision energy at the time of a ship collision due to deformation of a spherical athlete structure through a method of largely deforming the spherical athlete structure, but the apparatus of the present invention, By reducing the length of the athlete, it protects the ship in case of collision, in order to reduce the possibility of the protruding athlete piercing the ship's bulkhead of the other ship.

(3) The existing technique (Patent No. JP2004314825) is to use a metal material having a relatively low yield strength, so that the spherical aisle structure can easily cause bending deformation in the collision process, and the bending deformation of the spherical aisle structure Reduce the contact force in the event of a collision. However, the apparatus of the present invention reduces the length of the spherical athlete through cutting the spherical athlete, and protects the ship in collision on the basis of reducing the possibility that the projected spherical athlete pierces the cabin bulkhead of the other ship.

FIG. 1A is an automatic detachable spherical aisle structure view.
1B is an automatic separating type spherical aisle structure view.
2A is a structural view of a transverse cross-section AA of FIG. 1A.
2B is a structural view of a transverse cross-section AA of FIG. 1B.
FIG. 3A is a structural view of a BB transverse cross section corresponding to FIG. 1A. FIG.
FIG. 3B is a structural view of a BB transverse cross section corresponding to FIG. 1B. FIG.
4 is a structural view of a horizontal CC section of an automatic separable spherical bow structure.
5 is a partial enlarged view of a section CC of the horizontal CC and a section D of the automatic separable spherical bow structure.
Fig. 6 is a ship collision explanatory diagram.
FIG. 7 is an explanatory diagram of a collision effect of an automatic separation type spherical athlete. FIG.
8 is a process flow chart of the manufacturing method of the present invention.

Example 1:

Hereinafter, a description will be made in detail of an automatic separation type spherical athlete including replacement of a general low carbon steel using a high-strength material. Such high strength materials have certain properties including high yield strength, relatively high brittleness and low breaking strain.

Using an automatic detachable athlete on the hull can significantly reduce the threat to the opponent's vessel. In the process of high energy collision, the high strength material of the section is destroyed, thereby separating the spherical athlete from the main hull and reducing the fracture of the opposing hull structure. In the low energy collision process, The deformation of the spherical athlete is basically restored to its original shape since it is within the elastic range, so that it maintains sufficient completeness to cope with future collision.

1A and 1B illustrate two automatic separation type spherical aisle structures designed according to the technical idea of the present invention. As shown in FIGS. 1A and 1B, a black section 7 is formed of a high strength material 7 ), And the type and size of other parts can be designed according to existing shipbuilding regulations.

The thickness of the high strength material (7) is determined according to the alternative principle of the material strength, for example, in the general situation, the bulb sheathing plate (6) having a plate thickness of 18 mm and a yield strength of 235 MPa, When replacing the high-strength material plate 7 with Mpa, the thickness of the plate can satisfy the requirement for the strength by selecting (18 X 235) ÷ 690 = 6.13 (mm).

The dimension along the longitudinal direction (longitudinal direction) of the high strength material 7 of the ship:

If the spacing of the ship's frames is L ₀ , the longitudinal length of the high strength material (7) may be XL ₀ (1% to 100%).

It is preferable to install the high strength material 7 in front of the collision barrier. Particularly, it is preferable to install the high strength material 7 in front of the transverse reinforcing frame 9 inside the spherical athlete, For example, as shown in Fig. 1, the high-strength material 7 is provided in front of the transverse reinforcement frame 9. The high strength material 7 is provided on the front side of the transverse reinforcement frame 9 as shown in Fig.

Welding of High Strength Material (7) and General Hull Material: In order to prevent concentration of stress on the plate joint due to the change of plate thickness, it is necessary to smoothly connect plates having different thicknesses. So that the welded portion can be smoothened.

The following are the chemical composition of several selectable groups of low alloy high strength materials. However, the selectable high strength materials of the present invention are not limited to the several groups shown below.

Table 1: How many  Group Low alloy  Chemical composition of high strength material Percentage mass ratio

The following are the mechanical properties of the select group of low alloy high strength materials. However, the selectable high strength materials of the present invention are not limited to the several groups shown below.

Table 2: How many  Group Low alloy  Mechanical properties of high strength materials

The following are several types of welding solvents and welding methods that can be used for the welding of high strength materials. However, the welding solvent and the welding method which can be used for the welding of the high strength material of the present invention are not limited to several kinds shown below.

Table 3: Solvents for welding of select existing technologies

Those skilled in the art will be able to select the welding method corresponding to the above-mentioned group of low-alloy high-strength materials and realize the technique of the present invention very easily and easily according to the installation method.

Example 2:

In realizing the technical solution of the present invention, a simpler alternative is to connect the primary hull sheathing and the spherical forward sheathing with the high strength material welding solvent of the present invention. Since the welding solvent itself has various mechanical properties of the low-alloy high-strength material, it is not necessary to select another suitable low-alloy high-strength material and does not need to manufacture and manufacture, and directly using the solvent for high-strength material welding of the present invention, If the shell plate and the constituent shell plate are welded together, they can have equivalent brittleness and automatic fracture properties.

The following are selectable low alloy, high strength material welding solvents of several groups of the present invention. However, the selectable high strength material welding solvent of the present invention is not limited to any of the following groups.

Table 4: How many  Group Low alloy  High strength material Chemical composition of solvent for welding Percent mass ratio

Table 5: a few  kind of Low alloy  Mechanical properties corresponding to solvent for high strength material welding

Those skilled in the art will be able to select a group arbitrarily from the above-mentioned several groups of low-alloy high-strength material welding solvents and implement the technique of the present invention very easily and easily according to the installation method.

Example 3:

The low-alloy high-strength metal material may be partially provided at the connection portion between the bulb outer shell and the primary sheath shell. As shown in FIG. 1B, upper and lower portions of the low alloy high strength metal material can be installed at an intersection. As shown in a cross sectional view in the AA direction of FIG. 2B, the upper material is a low alloy high strength metal material, The material is a conventional bulb outer shell material. It is also possible to provide the low alloy high-strength metal material at a predetermined interval at the connection portion between the bulb outer shell and the main hull sheath. (Not shown)

As shown in Fig. 6, the automatic separable spherical athlete 5 manufactured according to the above method is in contact with the portion of the cabin 2 of the ship to be collided when the ship collides, The spherical athlete 5 impacts the side of the cabin 2 of the collided ship so that the hull of the cabin 2 of the collided ship is deformed because the balloon 1 has a constant running speed. The bulb 5 and the side of the cabin 2 of the collided ship are made to move relative to each other along the advancing direction of the cabin 2 of the collided ship because the cabin 2 of the collided ship also has a constant forward speed do. On the other hand, when the spherical athlete 5 is inserted into the hull 3 of the vessel to be collided, the hull 3 of the vessel to be impacted pushes the spherical athlete 5 by the relative motion, On the other hand, there is a very large frictional force between the spherical prongs 5 and the hull 3 of the collided ship because there is a relatively large bending moment and transverse shear stress, The effect of the frictional force is that the spherical pry (5) structure undergoes a very large shear stress.

When the impact energy is relatively large, the plate at the site of the high-strength material 7 is thinner than the adjacent plate material, so that the stress at the position is large. When the stress at the position reaches the breaking stress of the high- And the structure of the high strength material 7 is quickly broken, so that the front portion of the ball 5 of the impacting vessel 1 and the primary hull structure of the collision ship are quickly separated.

7, since the relative movement between the main hull 1 and the cabin 2 of the vessel to be collided still exists, the front part of the spherical athlete 5 is subjected to the action of the hull 3 of the vessel to be collided And then released from the main sheathing sheath 8 of the primary hull 1 to realize separation of the primary sheath 5 between the spherical sheave 5 and the primary sheath 1 .

If, in this case, the primary hull 1 still has a relatively high airspeed, it continues to move forward and continue to act on the cabin 2 of the vessel to be collided. At this time, since the length of the spherical prongs 5 is reduced and the area of the contact surfaces of the two ships is increased, the possibility of the front portion of the spherical prongs 5 being inserted into the cabin 2 of the collided ship is greatly reduced, Thereby preventing breakage of the barrier ribs 4 and protecting the barrier ribs 4 in the event of a collision.

The foregoing is merely illustrative of preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Main hull
2: Cabin of the bloody ship
3: Ship's hull
4: longitudinal bulkhead of the ship to be collided
5: Concept player
6: Contour plate outside
7: High strength material
8: main hull plating
9: transverse reinforcement frame
10: horizontal normal frame

Claims (10)

A, Select Material: Select the material,
B, material forming: The selected material is processed into a size and shape conforming to the size and shape of the bulb-to-bulb main hull connecting portion,
C: Installation: The selected material is attached to the spherical athlete and the main hull connecting portion through a welding, joining or inserting process to connect the spherical athlete and the main hull,
D, sanding treatment: sandwiching the connecting portion to smoothly connect the spherical athlete and the main hull,
E, anti-rust treatment: Sandblasting method,
F, watertight non-destructive inspection: The non-destructive inspection is carried out on the watertightness of the connection portion between the spherical athlete and the main hull. The method according to claim 1,
Wherein the selected material comprises a low alloy metal material. 3. The method of claim 2,
Wherein the low alloy metal material is installed at a connection portion between the spherical outsole plate and the primary sheathing sheathing. The method of claim 3,
Wherein the low alloy metal material has a yield strength value of at least 390 MPa and the yield strength of the low alloy metal material is greater than the yield strength of the adjacent primary hull sheathing material and spherical forward sheathing material. The method of claim 3,
Wherein the thickness of the low alloy metal material is thinner than the thickness of the adjacent main sheathing shell and sphere sheathing shell,
Wherein the central portion thickness of the low alloy metal material is thinner than the thickness of the low alloy metal material and the adjacent main hull outer plate and the spherical outer plate joint portion. 6. The method of claim 5,
Wherein the low alloy metal material and the adjacent main hull outer plate and the spherical outer plate joint portion are smoothly connected to each other. 3. The method of claim 2,
Wherein the percentages by mass of the low alloy metal material is greater than 0 and less than 0.2 carbon, greater than 0 and less than 0.55, lean greater than 0 and less than 0.045, sulfur greater than 0 and less than 0.045, vanadium greater than 0 and less than 0.2, niobium greater than 0,06, , Aluminum of more than 0 and not more than 0.7, chromium of more than 0 and not more than 1.2, nickel of not less than 0.45 and not more than 1.5, manganese of not less than 1.3 and not more than 1.6. The method of claim 3,
Wherein the welding solvent used in the welding step is the low alloy metal material. 9. The method of claim 8,
Wherein the percentage by mass of the welding solvent is in the range of more than 0 to 0.15, more than 0 to 0.8, less than 0, less than 0.03, sulfur 0 to 0.03, vanadium 0 to less than 0.05, aluminum 0 to less than 1.8, Nickel 2 or more and 2.6 or less, manganese 1.75 or more and 2.25 or less, and molybdenum 0.35 or more and 0.65 or less. 10. The method of claim 9,
Wherein the welding solvent can be formed by directly welding the sphere outer shell and the outer shell of the primary shell in place of the low alloy metal material.

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