JP2013256215A - Method of manufacturing rudder with rudder bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a rudder with a rudder bulb, capable of simplifying manufacturing steps.SOLUTION: A method of manufacturing a rudder 3 with a rudder bulb comprises: a step of preparing a plurality of horizontal ribs 43 and a plurality of vertical ribs 42; a step of forming an assembly 45 by combining them; a step of attaching the rudder bulb 5 to the assembly 45; and a step of forming a reaction rudder 4 by joining an outer plate 44 having a notch 441 corresponding to an outer shape of the rudder bulb 5 to a side surface of the assembly 45 to which the rudder bulb 5 is attached and by joining an edge part 442 of the notch 441 to a side surface of the rudder bulb 5. The reaction rudder 4 includes: an upper front edge of which the lower end part is positioned at a left side surface side of the reaction rudder 4 when viewed from the front and of which the upper end part is positioned at a right side surface side of the reaction rudder 4 rather than the lower end part; and a lower front edge of which the upper end part is positioned at the right side surface side of the reaction rudder 4 and of which the lower end part is positioned at the left side surface side of the reaction rudder 4 rather than the upper end part.

Description

  The present invention relates to a method for manufacturing a rudder with a rudder valve.

  A rudder valve-equipped rudder is known in which a rudder valve is provided behind the propeller in order to improve propulsion efficiency. For example, Patent Documents 1 and 2 disclose a rudder valve-equipped rudder that is attached so that a rudder valve opposes the propeller on the rotation axis of the propeller at the front end of the rudder.

  When manufacturing such a rudder valve-equipped rudder, first, as shown in FIG. 9A, a plurality of vertical ribs 101 arranged in parallel in the front-rear direction at a predetermined interval and a vertical interval in parallel with the predetermined interval. The plurality of arranged horizontal ribs 102 are combined so as to cross each other to form an assembly 103 as a skeleton of the rudder 40. At this time, the plurality of reinforcing plates 104 are disposed at positions corresponding to the propellers at the front end.

  Next, as shown in FIG. 9B, an outer plate is attached to the assembly 103 so as to cover the side surface of the assembly 103 to form the rudder 40. Next, as shown in FIG. 9C, a plurality of members 105 are joined to a position corresponding to the propeller at the front end portion of the rudder 40 while combining a plurality of members 105 according to the outer shape of the rudder 40. In this way, as shown in FIG. 9D, the rudder valve-equipped rudder 30 in which the rudder valve 50 is provided on the rudder 40 is formed.

JP 2004-299423 A JP 11-139395 A

  The rudder valve-equipped rudder 30 requires a ladder valve 50 having a shape corresponding to the outer shape of the rudder 40. Since the ladder valve 50 is generally manufactured by thick plate pressing or the like, it is difficult to form the ladder valve 50 according to the outer shape of the rudder 40. Therefore, the manufacturing process of the rudder valve 50, and thus the manufacturing process of the rudder valve-equipped rudder 30, may be complicated. In particular, when the rudder 40 has a complicated shape such as a reaction rudder, the shape of the ladder valve 50 becomes complicated, so that the manufacturing process of the rudder valve-equipped rudder 30 can be more complicated.

  Therefore, the objective of this invention is providing the manufacturing method of the rudder with a ladder valve which can simplify a manufacturing process.

  The method for manufacturing a rudder valve-equipped rudder according to one aspect of the present invention is a flat plate-like first that exhibits a streamline shape that becomes wider as it goes from the front end toward the wide portion and becomes narrower as it goes from the wide portion toward the rear end. To a first step of preparing a fourth horizontal rib, wherein the first and fourth horizontal ribs are line-symmetric with respect to a straight line connecting the front end and the rear end, and the second and third horizontal ribs are The first step is an asymmetrical shape with the front end approaching one side edge, the second step of preparing a plurality of vertical ribs, and the first to fourth horizontal ribs and the plurality of vertical ribs in combination. In the third step of forming the assembly as a skeleton of the rudder, the first to fourth horizontal ribs are arranged along a predetermined direction in this order, and the front end of the second horizontal rib is It is located on one side of the side and the front end of the third horizontal rib is the other side of the side of the assembly The third step, the fourth step of attaching the ladder valve to the assembly after the third step, and the notch corresponding to the outer shape of the ladder valve after the fourth step. The outer plate is joined to the side surface of the assembly to which the ladder valve is attached, and the edge of the notch is joined to the side surface of the ladder valve to form a reaction rudder. When viewed from the front, the lower front end is located on one side of the reaction rudder side and the upper end is located on the other side of the reaction rudder side from the lower end, and the upper end is the reaction rudder. And a lower front edge having a lower end located on one side of the reaction rudder side with respect to the upper end, and being located on the other side of the fifth side.

  In the method for manufacturing a rudder with a ladder valve according to one aspect of the present invention, it is not necessary to form a ladder valve according to the outer shape of the rudder. Therefore, a ladder valve having a simple shape can be used. Therefore, the ladder valve can be easily joined to the reaction rudder assembly, and workability can be improved. As a result, the manufacturing process of the rudder valve-equipped rudder can be simplified.

  According to various aspects of the present invention, a method for manufacturing a rudder valve-equipped rudder that can simplify the manufacturing process can be provided.

FIG. 1 is a side view schematically showing a ship including a rudder with a rudder valve. 2A is an enlarged side view showing the vicinity of the rudder with a rudder valve, and FIG. 2B is a front view of the rudder with a rudder valve in FIG. 2A. 2 (h) is an end view taken along line CC, an end view taken along line DD, an end view taken along line EE, an end view taken along line FF, and an end view taken along line GG in FIG. 2 (b). And HH line end view. FIG. 3 is an enlarged view showing a cross section taken along line FF in FIG. FIG. 4 is a schematic view showing a reaction rudder. 5A is a side view of the ladder valve, FIG. 5B is a top view of the ladder valve, and FIG. 5C is a front view of the ladder valve. 6A is an end view taken along the line VIA-VIA of FIG. 5B, and FIG. 6B is an end view taken along the line VIB-VIB of FIG. 5A. FIG. 7 is a diagram for explaining a manufacturing process of the rudder valve-equipped rudder. FIG. 8 (a) is an enlarged side view showing the vicinity of another example of a rudder with a rudder valve, and FIG. 8 (b) is a front view of the rudder with a rudder valve of FIG. 8 (a). 8 (c) to 8 (h) are respectively a CC line end view, a DD line end view, an EE line end view, an FF line end view, and a G- They are a G line end view and a HH line end view. FIG. 9 is a diagram illustrating a manufacturing process of a conventional rudder valve-equipped rudder.

  Embodiments of the present invention will be described with reference to the drawings. However, the following embodiments are exemplifications for explaining the present invention and are not intended to limit the present invention to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted. The dimensional ratios in the drawings are not limited to the illustrated ratios. In the following, the words “front” or “rear” correspond to the longitudinal direction of the hull, “left” or “right” corresponds to the horizontal direction (width direction) of the hull, and the words “up” or “lower”. Corresponds to the vertical direction of the hull.

  As shown in FIG. 1, a ship 1 according to the present embodiment is an enlarged ship such as a tanker, and includes a hull 10, a propeller 2 for propulsion, and a rudder 3 with a ladder valve.

  The propeller 2 for propulsion propels the ship 1 and uses, for example, a propeller shaft. As shown in FIG. 2A, the propeller 2 for propulsion is disposed on the stern portion 11 so that a shaft 2a that is a rotation shaft thereof is along the front-rear direction. The rudder valve-equipped rudder 3 is provided on the stern portion 11 so as to be positioned behind the propeller 2 for propulsion.

  As shown in FIG. 2A, the rudder valve-equipped rudder 3 includes a reaction rudder 4, a ladder valve 5, and a rudder shaft 6. The reaction rudder 4 controls the propulsion direction of the ship 1 and is disposed behind the propeller 2 for propulsion. The reaction rudder 4 is attached to the hull 10 by a rudder shaft 6 extending in the vertical direction and a shoe piece 12 extending rearward from the stern portion 11, and is swingable (rotatable) around the rudder shaft 6. is there.

  As shown in FIGS. 2B to 2H and FIG. 4, the reaction rudder 4 has an upper front edge 4a located on the upper side (the rudder shaft 6 side) of the ladder valve 5 when viewed from the front, A lower front edge 4b located on the lower side (the shoe piece 12 side) of the ladder valve 5; The lower end portion of the upper front edge 4a is located on one side of the reaction rudder 4 (on the left side in this embodiment). The upper end of the upper front edge 4a is located on the other side (right side in the present embodiment) of the side surface of the reaction rudder 4 than the lower end of the upper front edge 4a. In this embodiment, the upper end of the upper front edge 4a is located at the center portion in the width direction of the reaction rudder 4 as shown in FIG. ). Accordingly, the upper front edge 4a is twisted toward the left side surface of the reaction rudder 4 as it goes downward.

The upper end portion of the lower front edge 4b is located on the other side of the reaction rudder 4 (on the right side surface in this embodiment). The lower end of the lower front edge 4b is located on one side (the left side in the present embodiment) of the side surface of the reaction rudder 4 with respect to the upper end of the lower front edge 4a. In this embodiment, the upper end portion of the lower front edge 4b is located at the center portion in the width direction of the reaction rudder 4 as shown in FIG. AP). Therefore, the lower front edge 4b is twisted toward the right side surface of the reaction rudder 4 as it goes upward. As shown in FIG. 3, the maximum amount of twist of the upper front edge 4a and the lower front edge 4b (linear distance between the front edge and the rotation axis C of the propeller 2) t ₀ / t _max is 0.20 to 0.20. It can be set to about 0.35.

  The reaction rudder 4 has a notch 41 for attaching the ladder valve 5 at a position facing the propeller 2 on the rotation axis C of the propeller 2 for propulsion. The notch 41 has a shape corresponding to the ladder valve 5. Specifically, the notch 41 has a V-shape that opens forward as viewed from the side of the reaction rudder 4. The notch 41 is located between the front end of the reaction rudder 4 and the stern vertical line AP in the front-rear direction.

  The ladder valve 5 suppresses vortices generated on the rear side of the propeller 2 for propulsion, and is provided in the notch 41 of the reaction rudder 4. In other words, the ladder valve 5 weakens the vortex rotation by flowing a backward flow generated by the propeller 2 for propulsion along the surface of the ladder valve 5, thereby reducing the vortex resistance and improving the propulsion efficiency.

  As shown in FIGS. 5 and 6, the ladder valve 5 is a cylindrical body whose front end (one end) in the axial direction is closed. The ladder valve 5 includes a front part 51, a rear part 52, a first back reinforcing member 53, a second back reinforcing member 54, and a mounting member 55. The front portion 51 is a hook-like member that is located on the front side of the ladder valve 5 and is convex in the front direction. The rear portion 52 is a cylindrical member that is located on the rear side of the ladder valve 5 and extends in the front-rear direction with the axis C as a central axis. The front end portion of the rear portion 52 is joined to the rear end portion of the front portion 51 by welding.

  The first back reinforcing member 53 is an annular plate material provided on the inner surface of the ladder valve 5. The first back reinforcing member 53 is erected substantially perpendicularly to the inner surface of the ladder valve 5 at the joint portion between the front portion 51 and the rear portion 52. The first back reinforcing member 53 is for suppressing deformation of the ladder valve 5 due to water pressure, and functions as a reinforcing member when the front portion 51 and the rear portion 52 are joined.

  The second back reinforcing member 54 is an annular plate material provided on the inner surface of the ladder valve 5. The second back reinforcing member 54 is located on the inner surface of the contact portion between the ladder valve 5 and the reaction rudder 4 in a state where the ladder valve 5 is attached to the reaction rudder 4. The second back reinforcing member 54 is joined to only the contact portion of the inner surface of the front portion 51 by welding. The attachment member 55 is a plate material extending substantially horizontally in the front-rear direction along the axis C. The front end portion of the mounting member 55 is joined to the inner surface of the front portion 51 by welding, and the side end portions thereof are joined to the inner surface of the front portion 51 and the inner surface of the rear portion 52 by welding. The rear end portion of the attachment member 55 projects rearward from the rear end portion of the rear portion 52.

  Returning to FIG. 2, the ladder valve 5 is mounted in the notch 41 of the reaction rudder 4 so as to be substantially coaxial with the rotation axis C of the propeller 2 for propulsion. The front end portion of the ladder valve 5 projects forward from the front end portion of the reaction rudder 4. The side surface of the ladder valve 5 is joined to the opening edge of the notch 41 of the rudder 4 so as to be smoothly connected.

  Then, with reference to FIG. 7, the manufacturing method of the rudder 3 with a ladder valve is demonstrated. First, as shown in FIG. 7A, a plurality of vertical ribs 42 and a plurality of horizontal ribs 43 are prepared. The vertical rib 42 is a substantially rectangular plate material. The vertical rib 42 has a length corresponding to the vertical length of the reaction rudder 4 and a width corresponding to the width of the reaction rudder 4 in the left-right direction. The thickness direction of the vertical rib 42 corresponds to the longitudinal direction of the reaction rudder 4, the length direction of the vertical rib 42 corresponds to the vertical direction of the reaction rudder 4, and the width direction of the vertical rib 42 corresponds to the left-right direction of the reaction rudder 4. Correspond.

  The horizontal rib 43 is a plate material having a streamline shape that becomes wider as it goes from the front end toward the wide portion and becomes narrower as it goes from the wide portion toward the rear end. Specifically, the horizontal rib 43 is formed so that the rear end portion is formed at an acute angle when viewed from above, the width in the left-right direction is smoothly expanded toward the front end portion, and then is smoothly narrowed. Yes. The thickness direction of the horizontal rib 43 corresponds to the vertical direction of the reaction rudder 4, the length direction of the horizontal rib 43 corresponds to the front-rear direction of the reaction rudder 4, and the width direction of the horizontal rib 43 corresponds to the left-right direction of the reaction rudder 4. Correspond.

  The horizontal ribs 431 located on the upper surface of the reaction rudder 4 and the horizontal ribs 435 located on the lower surface have a bilaterally symmetric shape (a line symmetric shape with respect to a straight line connecting the front end and the rear end). The mounting horizontal rib 433, which is a horizontal rib at a position where the ladder valve 5 is mounted, has a shape in which the front end portion of the horizontal rib 431 is cut off according to the length of the ladder valve 5 in the front-rear direction.

  The horizontal rib 432 disposed between the upper surface of the reaction rudder 4 and the mounting position of the ladder valve 5 has an asymmetric shape in which the front end portion of the horizontal rib 431 is tilted to the left as it goes to the mounting position side of the ladder valve 5. doing. In other words, the top portion P <b> 2 of the horizontal rib 432 is shifted to the left with respect to the top portion P <b> 1 of the horizontal rib 431. The horizontal rib 434 disposed between the lower surface of the reaction rudder 4 and the mounting position of the ladder valve 5 has an asymmetric shape in which the front end portion of the horizontal rib 435 is inclined to the right as it goes to the mounting position side of the ladder valve 5. doing. In other words, the top portion P4 of the horizontal rib 434 is shifted to the right side with respect to the top portion P5 of the horizontal rib 435. At least one of the vertical ribs 42 and the horizontal ribs 43 is formed with slits (not shown) at predetermined intervals for assembling them.

  Subsequently, the plurality of horizontal ribs 43 are arranged in parallel at predetermined intervals in the vertical direction. Specifically, the horizontal ribs 431 to 435 are arranged so that the horizontal ribs 431 to 435 are arranged in this order along the vertical direction. At this time, rear end portions of the plurality of horizontal ribs 43 are aligned in the front-rear direction. Further, the mounting horizontal rib 433 is disposed at a position where the ladder valve 5 is mounted. That is, the mounting horizontal rib 433 is disposed at a position corresponding to the rotation axis C of the propeller 2 for propulsion in the vertical direction.

  Subsequently, the plurality of vertical ribs 42 are combined so as to intersect with the plurality of horizontal ribs 43. Specifically, the vertical rib 42 and the horizontal rib 43 are fitted using a slit formed in at least one of the vertical rib 42 and the horizontal rib 43, and the vertical rib 42 and the horizontal rib 43 are joined by welding. To do. In this way, an assembly 45 as a skeleton of the reaction rudder 4 is formed. Therefore, the front end (top P2) of the horizontal rib 432 is located on the left side of the assembly, and the front end (top P4) of the horizontal rib 434 is located on the right side. In the assembly 45, a space SA formed by the vertical rib 42 arranged on the foremost side and the front end portions of the horizontal ribs 43 arranged on both sides of the mounting horizontal rib 433 makes the ladder valve 5 a reaction rudder 4. It becomes a space for mounting.

  Subsequently, as illustrated in FIG. 7B, the ladder valve 5 is attached to the assembly 45. Specifically, the rear end portion of the ladder valve 5 is inserted from the front side of the assembly 45 so that the ladder valve 5 is positioned in the space SA formed in the assembly 45. Then, the rear end portion of the attachment member 55 of the ladder valve 5 is joined to the front end portion of the attachment horizontal rib 433 by welding. At this time, the rear end portion of the ladder valve 5 is attached to the assembly 45 so as to be positioned between the front end portion of the reaction rudder 4 and the rudder shaft 6.

  Then, as shown in FIG.7 (c), the outer plate | board 44 which comprises the side surface of the reaction rudder 4 is prepared. The outer plate 44 has a right outer plate that curves in a streamline and constitutes the right side surface of the reaction rudder 4, and a left outer plate that curves in a streamline and constitutes the left side surface of the reaction rudder 4. At a position corresponding to the rotation axis C of the propeller 2 for propulsion at the front end portion of the outer plate 44, a notch 441 having a V-shape when viewed from the side is formed. The notch 441 of the reaction rudder 4 is constituted by the notches 441 of the right outer plate and the left outer plate.

  The right outer plate has a certain width in the vertical direction and is smoothly curved so as to have a convex shape on the right side. The front end portion of the right outer plate is divided into an upper portion and a lower portion with a notch 441 as a boundary, and is curved so that the lower end of the upper portion and the upper end of the lower portion are separated in the left direction and the right direction, respectively. The left outer plate has a certain width in the vertical direction and is smoothly curved so as to have a convex shape on the left side. The front end portion of the left outer plate is divided into an upper portion and a lower portion with a notch 441 as a boundary, and is curved so that the lower end of the upper portion and the upper end of the lower portion are separated in the left direction and the right direction, respectively.

  Subsequently, the outer plate 44 is attached to the assembly 45 to which the ladder valve 5 is attached. Specifically, the inner surface of the right outer plate and the inner surface of the left outer plate are joined to the end of the vertical rib 42 and the end of the horizontal rib 43 of the assembly 45 by welding. Then, the edge 442 of the notch 441 formed in the outer plate 44 is brought into contact with the side surface of the ladder valve 5 and joined by welding so that the surface of the outer plate 44 and the surface of the ladder valve 5 are smoothly connected. The rudder valve-equipped rudder 3 shown in FIG. 7D is completed by the above procedure.

  In the present embodiment as described above, it is not necessary to form the ladder valve 5 according to the outer shape of the reaction rudder 4. Therefore, the ladder valve 5 having a simple shape can be used. Therefore, the ladder valve 5 can be easily joined to the assembly of the reaction rudder 4 and workability can be improved. As a result, the manufacturing process of the rudder 3 with a ladder valve can be simplified. Since the processing cost of the ladder valve 5 can also be reduced, the cost of the rudder 3 with the ladder valve can be reduced.

  In the present embodiment, the ladder valve 5 is provided with the first back reinforcing member 53 so that the ladder valve 5 itself is reinforced and the back reinforcement at the time of joining the front part 51 and the rear part 52 is performed with one member. Can do. For this reason, the manufacturing cost of the ladder valve 5 can be reduced. Furthermore, since the ladder valve 5 joined to the notch 41 of the reaction rudder 4 is subjected to a relatively large load on the front side, the second back reinforcing member 54 is provided on the front 51 of the ladder valve 5 as described above. Thereby, the junction part with the rudder 4 of the ladder valve 5 can be reinforced suitably.

  According to the classification rule, it is necessary to arrange one (integral) member that penetrates the rudder in the vertical direction at the rudder center that is the center position of the reaction rudder 4 that rotates. In this respect, in this embodiment, since the rear end portion (the other end portion) of the ladder valve 5 is located at the position from the front end portion of the reaction rudder 4 to the rudder shaft 6, one member passing through the rudder can be disposed. . Accordingly, it is possible to obtain the rudder valve-equipped rudder 3 in accordance with the classification rules, and to prevent the rudder valve 5 from adversely affecting the steering performance.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to above-described embodiment. For example, in the present embodiment, the lower portion of the reaction rudder 4 is attached to the shoe piece 12, but the shoe piece 12 may not be provided. Specifically, as shown in FIG. 8, the present invention can also be applied to a suspended rudder type rudder valve-equipped rudder 3 that is rotatably attached to a ladder horn 13 that is fixed to the hull 10. In this case, as shown in FIG. 8B, the front edge 4 c of the ladder horn 13 is twisted so as to be continuous with the upper front edge 4 a of the reaction rudder 4. That is, the front edge 4c of the ladder horn 13 is closer to the left side surface of the ladder horn 13 as it goes downward.

  In the present embodiment, the second back reinforcing member 54 is provided at the joint portion between the rudder valve 5 and the opening 41 of the rudder 4 on the inner surface of the front portion 51. You may be provided in the junction part of an inner surface. That is, the 2nd back reinforcement member 54 may be provided in the whole junction part of the ladder valve 5 and the notch part 41 of the reaction rudder 4, and may be provided in a part of junction part.

  According to the classification rule, it is necessary to arrange one member penetrating the rudder in the vertical direction at the center of the rudder. In this embodiment, the rudder shaft 6 is provided as one member penetrating the reaction rudder 4 in the vertical direction. However, instead of this, for example, at least one of the vertical ribs 42 may be arranged at the rudder.

  In this embodiment, the ladder valve 5 has a cylindrical shape with the front end portion closed, but may have a cylindrical shape with the front end portion and the rear end portion closed.

  In this embodiment, the ladder valve 5 is manufactured by joining the front part 51 and the rear part 52. However, instead, the ladder valve 5 may be manufactured integrally by casting, for example.

  In the present embodiment, each of the front part 51 and the rear part 52 is integrally configured, but each of the front part 51 and the rear part 52 may be configured by joining a plurality of members.

  The ship 1 is not limited to the enlarged ship, and may be other various ships.

  DESCRIPTION OF SYMBOLS 1 ... Ship, 3 ... Rudder with ladder valve, 4 ... Reaction rudder, 4a ... Upper front edge, 4b ... Lower front edge, 5 ... Ladder valve, 41 ... Notch part, 42 ... Vertical rib, 43 (431-435) ) ... Horizontal rib, 44 ... Outer plate, 45 ... Assembly, 441 ... Notch.

Claims (1)

This is a first step of preparing flat plate-shaped first to fourth horizontal ribs that have a streamline shape that becomes wider as it goes from the front end toward the wide portion and becomes narrower as it goes from the wide portion toward the rear end. The first and fourth horizontal ribs have a line-symmetric shape with respect to a straight line connecting the front end and the rear end, and the front end of the second and third horizontal ribs approaches one side edge side. A first step having an asymmetric shape;
A second step of preparing a plurality of vertical ribs;
A third step of combining the first to fourth horizontal ribs and the plurality of vertical ribs to form an assembly as a reaction rudder skeleton, wherein the first to fourth horizontal ribs are predetermined in this order. And the front end of the second horizontal rib is located on one side of the side surface of the assembly, and the front end of the third horizontal rib is on the side surface of the assembly. A third step located on the other side;
A fourth step of attaching a ladder valve to the assembly after the third step;
After the fourth step, an outer plate having a notch corresponding to the outer shape of the ladder valve is joined to a side surface of the assembly to which the ladder valve is attached, and an edge of the notch is attached to the ladder. A fifth step of forming a reaction rudder by joining to a side surface of the valve, wherein the reaction rudder has a lower end portion located on one side of the side surface of the reaction rudder and an upper end portion when viewed from the front; An upper front edge that is located on the other side of the side surface of the reaction rudder from the lower end portion, and an upper end portion that is located on the other side of the side surface of the reaction rudder and a lower end portion of the reaction rudder than the upper end portion A method for manufacturing a rudder with a rudder valve, comprising: a fifth step having a lower front edge located on one side of the side surface of the rudder.

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