Work processing method

Abstract

An object of the present invention is to provide a workpiece processing method and a workpiece processing jig that can reduce the man-hours and manufacturing costs involved in manufacturing a sail device equipped on a ship and improve the safety during work. 【Solution means】In the manufacture of the rigid sail 10 that constitutes the sail device 1 mounted on the ship S, a processing jig 2 having a molded surface formed into the shape of each part that constitutes the rigid sail 10 is prepared. A metal plate is placed on the mold of the processing jig 2 and bent into the shape of each part by being bent by its own weight. Thereafter, the rigid sail 10 can be obtained with a small number of man-hours by integrally processing the bent parts by welding or the like.

Description

Technical Field

[0001] The present invention relates to a method for processing a workpiece and a jig for processing a workpiece. Specifically, it relates to a method for processing a workpiece and a jig for processing a workpiece that can reduce the man-hour and manufacturing cost involved in the manufacture of a sail device equipped on a ship and improve the safety during work.

Background Art

[0002] Since ships consume a large amount of fossil fuels during navigation, they are a source of carbon dioxide emissions. Therefore, in order to suppress the carbon dioxide emissions during the navigation of ships, in addition to propulsion by a propulsion engine, sailing ships equipped with a sail device that uses wind power as a propulsive force are known. A general structure of a sail device includes a mast that stands upright on a hull, a boom for unfurling a sail, and a sail that generates a propulsive force for navigation by receiving wind, and energy conservation is achieved by utilizing the propulsive force generated by the sail device.

[0003] In a sailing ship, the strength of the thrust is determined by the area of the sail. However, in the case of a large merchant ship, a much larger thrust is required compared to a small sailing ship, so the area of the sail also needs to be correspondingly large. Further, as an essential function that a sailing ship should have, it is necessary to reef the sail to reduce the sail area during strong winds so that an excessive moment does not act on the base of the mast. Furthermore, it is desirable that the area and height of the sail can be freely adjusted so that problems such as interference with onshore cargo handling equipment or height restrictions when passing under a bridge do not occur.

[0004] Therefore, for example, Patent Document 1 discloses a sail device composed of a plurality of stepped arcuate or airfoil cross-section cylinders in which an assembly of sails made of a hard material (hard sails) is arranged in a nested manner as sails equipped on large merchant ships. According to the sail device disclosed in Patent Document 1, since the hard sails are divided into several upper and lower stages, when furling the sail, each can be nested and stored inside the hollow sail, thereby significantly reducing the total area of the sail. In addition, since the center of wind-receiving aerodynamic force also moves significantly downward, it is possible to greatly reduce the bending moment acting on the mast base, enabling the installation of a sail device with a larger area than before.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, as the material of the hard sail constituting the sail device disclosed in Patent Document 1 above, FRP (fiber-reinforced plastic) or GFRP (glass fiber-reinforced plastic) is generally used for weight reduction. However, since the hard sail is installed on the upper deck of the ship, the lower part of the sail may receive wave loads in rough weather. In this case, the hard sail made of FRP or GFRP has insufficient strength, so the lowermost unit of the nested structure needs to be made of steel with high surface strength.

[0007] Here, for example, in the manufacture of a rigid sail having a curved surface shape such as the above-mentioned arcuate cross-section or airfoil cross-section, the steel plate constituting the surface of the rigid sail needs to be subjected to curved surface processing in advance. However, due to the capacity of the equipment for bending the steel plate, the bending of a steel plate with a large area is restricted. Therefore, it is necessary to prepare a number of rectangular steel plates divided into relatively small areas and assemble the bent plate parts obtained by bending them. Specifically, a frame structure is assembled in advance with frame parts, and a construction method is adopted in which the bent plate parts are attached to this frame structure like a lantern stretch and welded together. On the other hand, in the case of a rigid sail for a large merchant ship, its thickness is about 3 m, and the work of attaching and welding the bent plate parts one by one to a frame structure with poor scaffolding has problems of extremely poor work efficiency and work-related danger.

[0008] The present invention was devised in view of the above points, and an object thereof is to provide a processing method for a workpiece and a processing jig for a workpiece that can reduce the man-hours and manufacturing costs involved in the manufacture of a sail device installed on a ship and improve the safety during work.

Means for Solving the Problems

[0009] To achieve the above object, the workpiece processing method of the present invention includes a step of installing a first processing jig having a molding surface corresponding to the shape of a first part, a step of installing a second processing jig having a molding surface corresponding to the shape of a second part, a step of placing one surface of a first metal plate for forming the first part on the molding surface of the first processing jig, a step of placing one surface of a second metal plate for forming the second part on the molding surface of the second processing jig, a step of forming the first part by bending the first metal plate by causing it to bend under its own weight along the shape of the molding surface of the first processing jig, a step of forming the second part by bending the second metal plate by causing it to bend under its own weight along the shape of the molding surface of the second processing jig, and a step of obtaining a rigid sail by oppositely joining the joining surface of the first part and the joining surface of the second part.

[0010] With the above configuration, when forming the first component and the second component that make up the rigid sail, place the first metal plate and the second metal plate on the first processing jig and the second processing jig, and then it is possible to easily form each component into its shape using its own weight. Therefore, since there is no need for complicated bending formation or repeated welding operations by joining multiple metal plates, the man-hours required for manufacturing the rigid sail can be significantly reduced. In addition, since the formed first component and second component are formed using metal plates with a large area, there are few joints and sufficient rigidity can be ensured.

[0011] Also, when fixing a first reinforcing member extending in a direction substantially orthogonal to the bending formation direction to the other surface, which is the surface opposite to one surface of the first metal plate, before the step of placing one surface of the first metal plate on the forming surface of the first processing jig, the first reinforcing member can be fixed to the flat first metal plate before bending formation. Therefore, compared with the case of fixing the first reinforcing member along the curved surface shape after bending formation by its own weight, the man-hours for fixing the first reinforcing member can be significantly reduced.

[0012] Furthermore, in addition to ensuring the rigidity of the rigid sail, which is the finished product, the first reinforcing member also functions as a pressing member during the bending formation of the first metal plate by its own weight. Therefore, by bending the first metal plate with the first reinforcing member fixed thereto, shape deformation after bending formation can be prevented. It should be noted that an important point in this step is that the reinforcing member (plate material described later) in the bending formation direction inhibits the bending formation by its own weight, so it is not attached in this step.

[0013] Also, when there is a step of fixing a second reinforcing member extending in a direction substantially orthogonal to the bending formation direction to the other surface, which is the surface opposite to one surface of the second metal plate, before the step of placing one surface of the second metal plate on the forming surface of the second processing jig, the second reinforcing member can be fixed to the flat second metal plate before bending formation. Therefore, compared with the case of fixing the second reinforcing member along the curved surface shape after bending formation by its own weight, the man-hours for fixing the second reinforcing member can be significantly reduced.

[0014] Furthermore, in addition to ensuring the rigidity of the finished hard sail, the second reinforcing member also functions as a pressing member during the bending formation due to the self-weight of the second metal plate. Therefore, by bending the second metal plate with the second reinforcing member fixed thereto, it is possible to prevent shape deformation after the bending formation. And an important point in this step is that the reinforcing member (plate material described later) in the bending formation direction inhibits the bending formation due to self-weight, so it is not attached in this step.

[0015] Also, before the step of obtaining the hard sail by oppositely joining the joint surface of the first component and the joint surface of the second component, on either the other surface of the first metal plate or the other surface of the second metal plate, in a direction orthogonal to the first reinforcing member or the second reinforcing member, when there is a step of fixing a plate material that extends and is installed inside the space formed between the first component and the second component of the finished hard sail, a plate material that can enhance the rigidity in the wind pressure direction can be installed on the hard sail.

[0016] Also, the hard sail has a first hard sail on one side and a second hard sail on the other side with a pipe material extending in the height direction sandwiched therebetween. When the step of obtaining the hard sail includes a step of joining and integrating the pipe material, the first hard sail, and the second hard sail respectively, the hard sail can be obtained by joining and integrating the pipe material, the first hard sail, and the second hard sail respectively.

[0017] To achieve the above object, the method for processing a workpiece according to the present invention includes a step of installing a processing jig on which a molding surface corresponding to the shape of the hard sail is formed, a step of placing one surface of the metal plate on the molding surface of the processing jig, a step of bending and forming the metal plate by allowing it to deflect under its own weight along the shape of the molding surface, and a step of removing the bent metal plate from the processing jig to obtain the hard sail.

[0018] With the above configuration, when forming the components that make up the rigid sail, the metal plate is placed on the processing jig, and then it can be easily formed into the shape of the component by utilizing its own weight. Therefore, since there is no need for complex bending formation or repeated welding operations by joining multiple metal plates, the man-hours required for manufacturing the rigid sail can be significantly reduced. In addition, since the formed components are formed using metal plates with a large area, there are few seams and sufficient rigidity can be ensured. Furthermore, in this construction method, since the operator works at a low position and the work is basically downward, work safety can be ensured. In the case where it is difficult to form only by its own weight locally, a heavy object such as a weight can be placed at the location where insufficient formation occurs, or the components can be attracted to each other to easily form the desired shape.

[0019] In order to achieve the above object, the processing jig for the workpiece of the present invention is a processing jig for manufacturing a rigid sail in which a first component and a second component are joined to face each other, a molding surface corresponding to the shape of the first component is formed, and a first processing jig capable of forming by bending by placing one surface of the first metal plate constituting the first component and deflecting it by its own weight, and a molding surface corresponding to the shape of the second component is formed, and a second processing jig capable of forming by bending by placing one surface of the second metal plate constituting the second component and deflecting it by its own weight.

[0020] With the above configuration, when forming the first component and the second component that make up the rigid sail, the first metal plate and the second metal plate are placed on the first processing jig and the second processing jig according to the present invention, and then they can be easily formed into the shape of each component by utilizing their own weight. Therefore, since there is no need for complex bending formation or repeated welding operations by joining multiple metal plates, the man-hours required for manufacturing the rigid sail can be significantly reduced. In addition, since the formed first component and second component are formed using metal plates with a large area, there are few seams and sufficient rigidity can be ensured.

Effects of the Invention

[0021] The work processing method and work processing jig according to the present invention can reduce the man-hours and manufacturing costs of the work related to the manufacture of the sail device equipped on the ship, and can improve the safety during work.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0023] Hereinafter, the work processing method and work processing jig according to the embodiment of the present invention will be described with reference to the drawings for the purpose of providing an understanding of the present invention. In each figure, for convenience of explanation, the upward direction in the state where the processing jig is installed is defined as upward, the opposite direction of upward is defined as downward, the axial direction represented by upward and downward is defined as the vertical direction, and the direction perpendicular to the vertical direction is defined as the horizontal direction.

[0024] [Sail Device] With reference to FIG. 1, the outline of the sail device 1 processed by applying the present invention will be described. The sail device 1 is mainly installed on the deck of a large ship S and has a function of utilizing wind power, which is renewable energy, as the driving force of the ship S. A plurality of rigid sails 10a to 10c (three-stage type in FIG. 1) having an arcuate cross-section or an airfoil cross-section are configured as one assembly.

[0025] Here, the rigid sails 10a to 10c constituting the sail device 1 do not necessarily have to be of the three-stage type as shown in FIG. 1, and can also be of the two-stage type or four-stage type or more.

[0026] The uppermost rigid sail 10c is nested and stored in the immediately lower rigid sail 10b, and the rigid sail 10b is nested and stored in the immediately lower rigid sail 10a, so that the overall area of the sail device 1 can be made variable.

[0027] Also, a pipe member 13 with a built-in storage mechanism penetrates through the central part of the sail device 1, and the proximal end side of the pipe member 13 is connected to a motor (not shown) that can rotate in the axial direction. Therefore, it is possible to rotate the sail device 1 to a position where the effective wind direction range of the sail device 1 with respect to the wind direction is the most efficient.

[0028] The above-described sail device 1 is preferably as lightweight as possible so as not to affect the stability of the ship S during navigation and the amount of cargo that can be loaded. Therefore, for the upper rigid sails 10b and 10c excluding the rigid sail 10a at the proximal end (deck side) among the rigid sails 10 constituting the sail device 1, it is common to mold them with lightweight materials such as FRP (fiber-reinforced plastic) and GFRP (glass fiber-reinforced plastic).

[0029] On the other hand, when the ship S is sailing in rough weather, waves may strike up to the height of the rigid sail 10a at the base end, and a wave load may be applied to the surface of the rigid sail 10a. In that case, since FRP or CFRP may be insufficient in strength, the rigid sail 10a at the base end may be formed of a steel plate (metal plate) from the viewpoint of ensuring strength. And the present invention is applied mainly to the manufacture of the rigid sail 10a formed of a metal plate located at the base end.

[0030] Note that the present invention is not necessarily applied only to the rigid sail 10a located at the base end of the sail device 1, and it is possible to apply it to other rigid sails other than the base end according to the total weight, the number of stages of the sail device 1, or the size of the ship S on which the sail device 1 is installed.

[0031] [Rigid sail] Next, based on FIG. 2, the detailed configuration of the rigid sail 10 manufactured by applying the present invention will be described. The rigid sail 10 is curved in a substantially arcuate cross-section and is composed of a first rigid sail 11 and a second rigid sail 12 that are symmetrically shaped with respect to each other across the pipe material 13.

[0032] The first rigid sail 11 is formed by integrally joining a first component 110 and a second component 111 to each other at the joint surface by welding. Similarly, the second rigid sail 12 is formed by integrally joining a first component 120 and a second component 121 to each other at the joint surface by welding. Then, the rigid sail 10 can be obtained by integrally joining the first rigid sail 11 and the second rigid sail 12 to each other on one side and the other side across the pipe material 13 by welding.

[0033] On the back surface of the first component 110 of the first rigid sail 11 (the surface facing the second component 111), a first reinforcing member 112 extending vertically in the vertical direction with the first rigid sail 11 standing is installed at a uniform width from one end to the other end, and further, a plate material 114 that is semi-arcuate or semi-wing-shaped in plan view and orthogonal to the first reinforcing member 112 is installed at a uniform width from the upper end to the lower end of the first component 110.

[0034] Further, on the back surface of the second component 111 of the first rigid sail 11 (the surface facing the first component 110), second reinforcing members 113 extending vertically in the erected state of the first rigid sail 11 are evenly arranged from one end to the other end.

[0035] The same applies to the second rigid sail 12 which has a symmetrical shape to the first rigid sail 11. On the back surface of the first component 120 of the second rigid sail 12 (the surface facing the second component 121), first reinforcing members 122 extending vertically in the erected state of the second rigid sail 12 are installed with an equal width from one end to the other end. Further, plate members 124 in a semi-arch shape or semi-wing shape in plan view are installed with an equal width from the upper end to the lower end of the first component 120 so as to be orthogonal to the first reinforcing members 122.

[0036] Also, on the back surface of the second component 121 of the second rigid sail 12 (the surface facing the first component 120), second reinforcing members 123 extending vertically in the erected state of the second rigid sail 12 are evenly arranged from one end to the other end.

[0037] [Processing jig] Next, the processing jig 2 according to the embodiment of the present invention will be described with reference to FIGS. 3 and 4. The processing jig 2 is composed of a first processing jig 21 and a second processing jig 22. Among them, the first processing jig 21a is a jig for forming the first component 110 of the first rigid sail 11, the first processing jig 21b is a jig for forming the first component 120 of the second rigid sail 12, and the second processing jig 22 is a jig for forming the second component 111 of the first rigid sail 11 and the second component 121 of the second rigid sail 12.

[0038] First, the first processing jig 21a for forming the first component 110 related to the first rigid sail 11 is on the right side facing the paper surface of FIG. 3, and the first processing jig 21b for forming the first component 120 related to the second rigid sail 12 is on the left side. The first processing jigs 21a and 21b are each in a symmetrical shape.

[0039] The first processing jigs 21a and 21b are composed of plate-shaped molding dies 210a and 210b having a molding surface curved in a concave shape corresponding to the shapes of the first parts 110 and 120, and bases 211a and 211b that support the molding dies 210a and 210b and are installed on the installation surface. And such first processing jigs 21a and 21b are arranged in a vertical row at predetermined equal intervals according to the sizes of the first metal plates 3a and 3b for molding the first parts 110 and 120.

[0040] Here, the installation intervals and the number of installations of the first processing jigs 21a and 21b can be appropriately changed so that when the first metal plates 3a and 3b are placed on the first processing jigs 21a and 21b, the first metal plates 3a and 3b do not bend in the vertical row direction of the first processing jigs 21a and 21b.

[0041] Also, it is not always necessary to arrange a plurality of first processing jigs 21a and 21b composed of plate-shaped molding dies 210a and 210b in the vertical row direction. For example, the first processing jigs 21a and 21b may be block bodies having a molding surface formed with a surface area on which the first metal plates 3a and 3b can be placed.

[0042] FIG. 4 shows a second processing jig 22 for molding the second part 111 of the first rigid sail 11 and the second part 121 of the second rigid sail 12. The second processing jig 22 includes a plate-shaped molding die 220 having a convex-shaped curved molding surface on which a semi-finished product 5, in which a second metal plate 4a for molding the second part 111 related to the first rigid sail 11 and a second metal plate 4b for molding the second part 121 related to the second rigid sail 12 are integrated by welding to the pipe material 13 described above, is placed, and a base 221 that supports the molding die 220 and is installed on the installation surface. And such second processing jigs 22 are arranged in a vertical row at predetermined equal intervals according to the size of the semi-finished product 5.

[0043] Here, the installation intervals and the number of installations of the second processing jig 22 can be appropriately changed so that when the semi-finished product 5 is placed on the second processing jig 22, the semi-finished product 5 does not bend in the vertical row direction of the second processing jig 22.

[0044] Also, it is not always necessary to arrange the plurality of second processing jigs 22 composed of the plate-shaped forming die 220 in the vertical direction. For example, the second processing jig 22 may be in the form of a block body on which a molding surface having a surface area on which the semi-finished product 5 can be placed is formed.

[0045] Also, it is not always necessary to bend and form the second processing jig 22 in the state of the semi-finished product 5 in which the second metal plates 4a and 4b and the pipe material 13 are integrated. Similar to the first processing jig 21, a processing jig for forming the second component 111 related to the first rigid sail 11 and a processing jig for forming the second component 121 related to the second rigid sail 12 are prepared respectively. After forming the second components 111 and 121 with each processing jig, they may be joined to the pipe material 13.

[0046] [Processing Method] Next, a processing method of the rigid sail 10 using the above-described first processing jig 21 and second processing jig 22 will be described with reference to FIGS. 3 to 6.

[0047] <Step 1: Installation of Processing Jig> First, the first processing jig 21 and the second processing jig 22 are installed on the installation surface (see FIGS. 3 and 4). Regarding the number of installations and the installation intervals of the respective processing jigs, they shall be appropriately changed according to the sizes of the first metal plates 3a and 3b and the semi-finished product 5 used for processing as described above.

[0048] Here, in the embodiment of the present invention, the first metal plates 3a and 3b for forming the first components 110 and 120 are metal plates of about 6 m × about 15 m respectively (see FIG. 3). And when bending and forming the first metal plates 3a and 3b described later, five first processing jigs 21a and 21b are installed at equal intervals of about 3 m so that no bending occurs in the vertical direction in a state where the first metal plates 3a and 3b are placed on the molding surfaces of the forming dies 210a and 210b of the first processing jigs 21a and 21b.

[0049] Also, the second metal plates 4a and 4b for forming the second components 111 and 121 are also metal plates having substantially the same size as the first metal plates 3a and 3b. And in the molding of the second components 111 and 121, as described above, the second metal plates 4a and 4b are integrated with the pipe material 13 by welding to form a semi-finished product 5 in a state of being molded. As a result, it becomes a metal plate having a size of about 15 m square as a whole (see FIG. 4). And when the second metal plates 4a and 4b are bent and formed as described later, five second processing jigs 22 are installed at equal intervals of about 3 m so that the semi-finished product 5 does not bend in the longitudinal direction in a state where it is placed on the molding surface of the second processing jig 22.

[0050] Note that the installation intervals of the first processing jig 21 and the second processing jig 22 are not necessarily limited to about 3 m, and can be appropriately changed within a range where no bending occurs in the longitudinal direction of the metal plate.

[0051] <Process 2: Fixing of the reinforcing material to the metal plate> Before placing the first metal plates 3a and 3b on the first processing jigs 21a and 21b, the first reinforcing materials 112 and 122 are fixed to the first metal plates 3a and 3b (see FIG. 3). The first reinforcing materials 112 and 122 extend in a direction substantially orthogonal to the bending formation direction of the first metal plates 3a and 3b (the full height direction), and are installed at equal intervals along the width direction of the first metal plates 3a and 3b.

[0052] Similarly, for the semi-finished product 5, the second reinforcing materials 113 and 123 are fixed to the second metal plates 4a and 4b before placing them on the second processing jig 22 (see FIG. 4). The second reinforcing materials 113 and 123 extend in a direction substantially orthogonal to the bending formation direction of the second metal plates 4a and 4b (the full height direction), and are installed at equal intervals along the width direction of the second metal plates 4a and 4b.

[0053] Incidentally, the fixing of the first reinforcing members 112 and 122 to the first metal plates 3a and 3b and the second reinforcing members 113 and 123 to the second metal plates 4a and 4b according to step 2 may be performed after the bending formation by the metal plate processing jig described later. However, when fixing the reinforcing member to the metal plate after bending formation, since it is necessary to fix the reinforcing member to the curved surface, the working efficiency may deteriorate compared to fixing to a flat surface. Furthermore, since these reinforcing members also serve to prevent the shape deformation of the metal plate after bending formation, if the reinforcing member is fixed after bending formation, there is also a risk that the metal plate may be deformed in shape before the fixing of the reinforcing member. Therefore, from the viewpoint of improving the working efficiency and further preventing the shape deformation after bending formation, it is preferable to fix the reinforcing member to the flat metal plate.

[0054] <Step 3: Placement of Metal Plate> Next, the first metal plates 3a and 3b are placed on the first processing jigs 21a and 21b, respectively. Here, when placing the first metal plates 3a and 3b on the first processing jigs 21a and 21b, they are placed on the first processing jigs 21a and 21b such that the surfaces opposite to the surfaces to which the first reinforcing members 112 and 122 were fixed in step 2 face the forming surface.

[0055] Also, the semi-finished product 5 is placed on the second processing jig 22. Similarly for the semi-finished product 5, it is placed on the second processing jig 22 such that the surface opposite to the surface to which the second reinforcing members 113 and 123 were fixed in step 2 faces the forming surface. Note that the semi-finished product 5 may be integrated in a state where the second metal plates 4a and 4b and the pipe material 13 are respectively placed on the second processing jig 22, or may be placed on the second processing jig 22 in a state where the second metal plates 4a and 4b and the pipe material 13 are integrated in advance.

[0056] After the placement of the metal plates on the first processing jigs 21a and 21b and the second processing jig 22 is completed, after confirming whether there is any deflection in the state where the first metal plates 3a and 3b are placed on the first processing jigs 21a and 21b or the semi-finished product 5 is placed on the second processing jig 22, if deflection has occurred, the first processing jigs 21a and 21b and the second processing jig 22 are additionally installed as necessary to eliminate the deflection.

[0057] <Process 4: Bending and Forming of Metal Sheets> The first metal sheets 3a and 3b placed on the first processing jigs 21a and 21b start to bend due to their own weight and are bent and formed into the shapes along the forming surfaces of the first processing jigs 21a and 21b, and the first components 110 and 120 are formed (see Fig. 5(a)). Similarly, for the semi-finished product 5 placed on the second processing jig 22, the second metal sheets 4a and 4b start to bend due to their own weight and are bent and formed into the shapes along the forming surface of the second processing jig 22, and the second components 111 and 121 integrated with the pipe material 13 are formed (see Fig. 5(b)). Note that in Fig. 5(b), the illustration of the pipe material 13 is omitted for the sake of convenience.

[0058] Here, the thickness of the first metal sheets 3a and 3b and the second metal sheets 4a and 4b used in the embodiment of the present invention is 4.5 mm, but it is not necessarily limited to this. The thickness of each metal sheet can be appropriately changed within the range where the metal sheet can bend due to its own weight and be bent and formed into a shape with a predetermined curvature in consideration of the rigidity required for the final product as a hard sail.

[0059] <Process 5: Assembly of the Hard Sail> When the semi-finished product 5 including the first components 110 and 120 and the second components 111 and 121 is formed in Process 4, these are joined to assemble the hard sail 10. In the assembly of the hard sail 10, first, the plate materials 114 and 124 are respectively fixed to the first components 110 and 120. The plate materials 114 and 124 extend in a direction orthogonal to the first reinforcing materials 112 and 122 and are semi-arc-shaped or semi-wing-shaped in plan view, and are installed with a uniform width from one end to the other end in the length direction of the first components 110 and 120. Then, the plate materials 114 and 124 are installed inside the space formed between the first components 110 and 120 and the second components 111 and 121 after the assembly of the hard sail 10, and mainly function as reinforcing materials for increasing the rigidity of the hard sail 10 in the wind pressure direction.

[0060] After fixing the plate materials 114 and 124 to the first components 110 and 120, lift the first components 110 and 120 on the first processing jigs 21a and 21b with a lifting device such as a crane, and move them directly above the semi-finished product 5 on the second processing jig 22. Then, while checking the joint surfaces of the first components 110 and 120 and the joint surfaces of the second components 111 and 121 included in the semi-finished product 5, carefully lower the first components 110 and 120 to the position where they contact the semi-finished product 5 (see Fig. 6).

[0061] When the first components 110 and 120 come into contact with the second components 111 and 121, weld the respective contact surfaces to integrate them. Further, bring the proximal ends of the first components 110 and 120 into contact with the pipe material 13 and weld the contact surfaces to integrate them, and the rigid sail 10 including the first rigid sail 11 and the second rigid sail 12 is completed.

[0062] In the above process, the integration of the second metal plates 4a and 4b and the pipe material 13 into the semi-finished product 5 and the process of fixing the first components 110 and 120 to the formed semi-finished product 5 have been described. However, it is not necessarily required to process based on such a procedure. For example, the first components 110 and 120 may be formed from the first metal plates 3a and 3b, and further, the second components 111 and 121 may be formed from the second metal plates 4a and 4b, and these first components 110 and 120 and the second components 111 and 121 may be joined to the pipe material 13. The joining procedure of the first components 110 and 120, the second components 111 and 121, and the pipe material 13 can be appropriately changed.

[0063] Also, in the above embodiment, the procedure of first joining the plate materials 114 and 124 to the first components 110 and 120 and then joining and integrating the contact surfaces with the second components 111 and 121 in subsequent processes has been described. However, the plate materials 114 and 124 may be fixed to the second components 111 and 121 first, and then the contact surfaces with the first components 110 and 120 may be joined and integrated.

[0064] In the above-described embodiment, the rigid sail having a substantially arcuate cross-section that is symmetric about the left and right in a front view with the pipe material 13 sandwiched therebetween has been described. However, for example, a rigid sail having a substantially airfoil-shaped cross-section that is asymmetric about the left and right, or a rigid sail having another shape can also be assembled by the same processing method.

[0065] As described above, the method for processing a workpiece and the processing jig for a workpiece according to the present invention can reduce the man-hours and manufacturing costs involved in manufacturing a sail device equipped on a ship, and can improve the safety during work.

Explanation of Reference Numerals

[0066] 1 Sail device 10, 10a, 10b, 10c Rigid sail 11 First rigid sail 110 First component 111 Second component 112 First reinforcing material 113 Second reinforcing material 114 Plate material 12 Second rigid sail 120 First component 121 Second component 122 First reinforcing material 123 Second reinforcing material 124 Plate material 13 Pipe material 2 Processing jig 21, 21a, 21b First processing jig 210, 210a, 210b Molding die 211, 211a, 211b Base 22 Second processing jig 220 Molding die 221 Base 3a, 3b First metal plate 4a, 4b Second metal plate 5 Semi-finished product S Ship

Claims

1. The step of installing a first processing jig having a molding surface corresponding to the shape of the first component; The step of installing a second processing jig having a molding surface corresponding to the shape of the second component; The step of placing one surface of the first metal plate for forming the first component on the molding surface of the first processing jig; The step of placing one surface of the second metal plate for forming the second component on the molding surface of the second processing jig; The step of forming the first component by bending the first metal plate under its own weight along the shape of the molding surface of the first processing jig; The step of forming the second component by bending the second metal plate under its own weight along the shape of the molding surface of the second processing jig; The step of obtaining a rigid sail by oppositely joining the joint surface of the first component and the joint surface of the second component, and comprising A method for processing a workpiece.

2. Before the step of placing one surface of the first metal plate on the molding surface of the first processing jig, a first reinforcing member extending in a direction substantially orthogonal to the bending direction is fixed to the other surface, which is the surface opposite to the one surface of the first metal plate; Before the step of placing one surface of the second metal plate on the molding surface of the second processing jig, the step of fixing a second reinforcing member extending in a direction substantially orthogonal to the bending direction to the other surface, which is the surface opposite to the one surface of the second metal plate The method for processing a workpiece according to Claim 1.

3. Before the step of obtaining a rigid sail by oppositely joining the joint surface of the first component and the joint surface of the second component, The step of fixing a plate material extending in a direction orthogonal to the first reinforcing member or the second reinforcing member to either the other surface of the first metal plate or the other surface of the second metal plate and being installed in the space formed between the first component and the second component of the completed rigid sail The method for processing a workpiece according to Claim 2.

4. The rigid sail has a first rigid sail on one side and a second rigid sail on the other side with a pipe material extending in the height direction sandwiched therebetween; The step of obtaining the rigid sail includes the step of joining and integrating the pipe material, the first rigid sail, and the second rigid sail respectively The method for processing a workpiece according to Claim 1 or Claim 2.

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