A method for installing a typical outer plate double bevel jig

Abstract

The present invention discloses a method for installing a curved outer plate double bevel cutting jig in the technical field of ship jig installation, including S1: obtaining the side view and rib line drawing of the curved section; S2: obtaining the jig reference plane and transverse inclination angle A by making the tangential line of the rib line; S3: obtaining the jig center line; S4: making the height indication lines of each rib line from the center of the jig center line to both sides; and determining the longitudinal inclination angle B based on the theoretical rib pitch and center line height of each rib line; S5: completing the construction of the double bevel cutting jig based on the theoretical rib pitch, height indication line value and longitudinal inclination angle B of each rib line. The curve shape of the jig installed by the present invention fits the curved outer plate more closely, not only ensuring the construction quality of the curved outer plate, but also improving the construction efficiency of the curved outer plate.

Description

Technical Field

[0001] The present invention relates to the technical field of ship jig installation, and particularly relates to a method for installing a double beveled jig for a curved outer plate. Background Art

[0002] The construction process of the semi-stereoscopic section of the curved outer plate at the bottom of the ship is a reverse construction + loose pasting outer plate process flow mode. This construction process not only requires the production of a stepped jig, but also has disadvantages such as a narrow internal working space and difficult internal welding due to the loose pasting of the outer plate, low efficiency in converting to flat welding during turnover, and welding deformation caused by unreasonable placement, resulting in low production efficiency. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for installing a double beveled jig for a curved outer plate to solve the technical problem of low production efficiency caused by the existing stepped jig.

[0004] The technical solution adopted by the present invention is as follows: A method for installing a double beveled jig for a curved outer plate, including:

[0005] S1: Obtain the side view and frame line drawing of the curved section; wherein, the frame line drawing includes a first end frame line, a second end frame line, and at least one middle frame line;

[0006] S2: Obtain the jig reference plane and the transverse inclination angle A; wherein, the jig reference plane includes a first jig reference line and a second jig reference line arranged in parallel, and after translation, the first jig reference line and the second jig reference line can be respectively tangent to the first end frame line and the second end frame line; the angle between the first jig reference line and the ship's baseline is the transverse inclination angle A;

[0007] S3: Obtain the jig center line and the third jig reference line; wherein, the jig center line passes through the midpoint of the first end frame line and is perpendicular to the first jig reference line; the third jig reference line corresponds to the middle frame line one by one, and the end points of the third jig reference line are the vertical projections of both ends of the middle frame line on the jig reference plane;

[0008] S4: Make the height indication lines of the first end frame line, the second end frame line, and the middle frame line on both sides with the jig center line as the center; and determine the longitudinal inclination angle B based on the theoretical frame pitch and the center line height of the first end frame line, the second end frame line, and the middle frame line;

[0009] S5: Complete the construction of the double beveled jig based on the theoretical frame pitch, the height indication line values, and the longitudinal inclination angle B of the first end frame line, the second end frame line, and the middle frame line.

[0010] Further, the S2 includes:

[0011] S21: Obtain the first reference point on the first end rib line;

[0012] S22: Draw the normal line of the first reference point, and obtain the second reference point on the normal line. The distance between the second reference point and the first reference point is a;

[0013] S23: Draw the first jig reference line perpendicular to the normal line through the second reference point; the included angle between the first jig reference line and the ship's baseline is the heel angle A;

[0014] S24: Draw a parallel line of the first jig reference line tangent to the second end rib line;

[0015] S25: Draw the second jig reference line parallel to the parallel line of the first jig reference line and at a distance of b.

[0016] Furthermore, the first reference point is the lowest point of the first end rib line.

[0017] Furthermore, a = b = 800 mm.

[0018] Furthermore, the S3 includes:

[0019] S31: Draw the jig center line perpendicular to the first jig reference line through the midpoint of the first end rib line;

[0020] S32: Obtain the first vertical projection points of the two end points of the first end rib line on the first jig reference line, obtain the second vertical projection points of the two end points of the second end rib line on the second jig reference line, and connect the corresponding first vertical projection points and second vertical projection points to obtain the jig reference plane reference line;

[0021] S33: Connect the third vertical projection points of the two end points of the intermediate rib line on the corresponding jig reference plane reference line, which is the third jig reference line.

[0022] Furthermore, the S4 includes:

[0023] S41: Make equidistant height indication lines of the first end rib line, the second end rib line and the middle rib line on both sides with the jig center line as the center;

[0024] S42: Vertically connect the two end points of the first end rib line, the second end rib line, and the middle rib line to the first jig reference line, the second jig reference line, and the third jig reference line one by one to obtain the edge height indication lines.

[0025] S43: Create a sectional view along the center line direction of the jig, and calculate the longitudinal inclination angle B based on the theoretical rib pitch L from the first end rib line to the second end rib line and the center line height H of the first end rib line in the sectional view. The calculation formula is: tan∠B = H / L.

[0026] Further, the distance between two adjacent equal-spacing elevation lines is 1000 mm.

[0027] Further, number cutting templates are provided at the positions of the first end rib line, the second end rib line, and the middle rib line on the top of the double bevel cutting jig in one-to-one correspondence. The number cutting template has an upper curved surface that fits the curved outer plate.

[0028] Further, the S5 includes:

[0029] S51: Obtain the height parameter from the lower curved surface of each number cutting template to the jig reference plane with reference to the thickness of the number cutting template;

[0030] S52: Obtain the positioning map of the number cutting template on the jig reference plane based on the theoretical rib pitch of the first end rib line, the second end rib line, and the middle rib line and the distance between the elevation lines;

[0031] S53: Determine the connection position between the number cutting template and the jig column according to the height parameter;

[0032] S54: Lift the template jig frame assembled and welded in the sub-assembly stage to the installation position on the jig reference plane, and install and fix the template jig frame according to the longitudinal inclination angle B.

[0033] The beneficial effects of the present invention:

[0034] 1. First, the present invention determines the jig reference plane and the transverse inclination angle by drawing the first jig reference line and the second jig reference line that correspond to and are equidistant from the first end rib line and the second end rib line, and then determines the height and longitudinal inclination angle of each center line by drawing the jig center line through the first end rib line; then, elevation lines are made on both sides from the center line to obtain the height values of each rib line, and the installation of the double bevel cutting jig can be quickly completed; the curve shape of the jig installed using the present invention fits the curved outer plate more closely, which not only ensures the construction quality of the curved outer plate but also improves the construction efficiency of the curved outer plate.

[0035] 2. The present invention is provided with a number cutting template on the top of the double bevel cutting jig. The number cutting template has an upper curved surface that can fit the curved outer plate precisely, making the appearance of the semi-solid segment of the curved outer plate at the bottom of the ship beautiful and meeting the requirements of precision dimensions.

[0036] 3. The double bevel cutting jig of the present invention replaces the reverse construction mode of the semi-solid section of the bottom curved outer plate, avoiding the phenomenon of low efficiency in complex three-dimensional operations and solving the internal structure welding problem; using the double bevel cutting jig of the present invention can reduce the once-lifting and turning-over operation, facilitate the planarization of the welding method for operators, and thus improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a side view of the curved section of the ship;

[0038] Figure 2 is a figure of the frame line of the ribs and the double bevel cutting jig of the curved section of the ship;

[0039] Figure 3 is a longitudinal sectional view of the center line of the double bevel cutting jig;

[0040] Figure 4 is a transverse sectional view of the F63-586 rib frame and the double bevel cutting jig;

[0041] Figure 5 is a transverse sectional view of the F68 rib frame and the double bevel cutting jig;

[0042] Figure 6 is a transverse sectional view of the F77 rib frame and the double bevel cutting jig;

[0043] Figure 7 is a transverse sectional view of the F80+186 rib frame and the double bevel cutting jig;

[0044] Figure 8 is a template drawing of the double bevel cutting jig of F63-586 and a height value table;

[0045] Figure 9 is a template drawing of the double bevel cutting jig of F68 and a height value table;

[0046] Figure 10 is a template drawing of the double bevel cutting jig of F77 and a height value table;

[0047] Figure 11 is a template drawing of the double bevel cutting jig of F80+186 and a height value table;

[0048] Figure 12 is a construction implementation drawing of the double bevel cutting jig template and the jig columns;

[0049] Figure 13 is a ground marking plan of the double bevel cutting jig;

[0050] Figure 14 is a vertical height value data drawing of the double bevel cutting jig;

[0051] Figure 15 is a three-dimensional drawing of the double bevel cutting jig;

[0052] Figure 16 Reference diagram of the usage state of the double bevel cutting jig

[0053] Figure 17 Installation flow chart of the double bevel cutting jig

[0054] In the figure:

[0055] 10 - Benchmark plane of the jig; 11 - First reference line of the jig; 12 - Second reference line of the jig; 13 - Third reference line of the jig; 14 is the reference line of the benchmark plane of the jig

[0056] 20 - Ship baseline

[0057] 30 - Center line of the jig

[0058] 40 - Numerical cutting template

[0059] 50 - Punch mark

[0060] 60 - Jig column

[0061] 70 - 600mm horizontal inspection line

[0062] 80 - Longitudinal section line

[0063] 90 - Semi - solid section of the curved outer plate Specific implementation manners

[0064] The following further elaborates in detail the specific implementation manners of the present invention in conjunction with the attached drawings. These implementation manners are only used to illustrate the present invention and are not intended to limit the present invention

[0065] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance

[0066] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0068] Embodiments, such as Figure 1 , Figure 2 , Figure 3 , Figure 17 shown, a method for installing a double bevel cutting jig for a curved outer plate, the method comprising:

[0069] S1: Obtain a side view and a frame line drawing of the curved section; wherein, the frame line drawing includes a first end frame line, a second end frame line, and at least one middle frame line.

[0070] S2: Obtain the jig reference plane 10 and the transverse inclination angle A; wherein, the jig reference plane 10 includes a first jig reference line 11 and a second jig reference line 12 arranged in parallel. The first jig reference line 11 is tangent to the first end frame line after translating a distance b towards the first end frame line, and the second jig reference line 12 is tangent to the second end frame line after translating a distance a towards the second end frame line; the angle between the first jig reference line 11 or the second jig reference line 12 and the ship baseline 20 is the transverse inclination angle A.

[0071] S3: Obtain the jig center line 30 and the third jig reference line 13; wherein, the jig center line 30 passes through the midpoint of the first end frame line and is perpendicular to the first jig reference line 11; the third jig reference line 13 has a one-to-one correspondence with the middle frame line, and the endpoints of the third jig reference line 13 are the vertical projections of both ends of the middle frame line on the jig reference plane 10.

[0072] S4: Make elevation lines of the first end frame line, the second end frame line, and the middle frame line on both sides with the jig center line 30 as the center; and determine the longitudinal inclination angle B based on the theoretical frame pitch and the center line height of the first end frame line, the second end frame line, and the middle frame line.

[0073] S5: Complete the construction of the double bevel cutting jig based on the theoretical frame pitch, the elevation line values, and the longitudinal inclination angle B of the first end frame line, the second end frame line, and the middle frame line.

[0074] In this application, a first jig reference line 11 with a tangential line distance of a from the first end rib line is drawn on the rib lines diagram, and a second jig reference line 12 with a tangential line distance of b from the second end rib line is drawn on the rib lines diagram. Then, the jig reference plane 10 and the transverse inclination angle A are determined by the parallel first jig reference line 11 and second jig reference line 12. Next, the height of each center line and the longitudinal inclination angle B are determined by drawing the jig center line 30 through the first end rib line. Then, height indication lines are drawn from both sides of the jig center line 30 to obtain the height values of each rib line. According to the obtained transverse inclination angle A, longitudinal inclination angle B, theoretical rib pitch, and rib line height parameters, the installation of the double bevel cutting jig can be quickly completed. The curve shape of the jig installed using the method of this application fits the curved outer plate better, not only ensuring the construction quality of the curved outer plate but also improving the construction efficiency of the curved outer plate.

[0075] In a specific embodiment, as Figure 1 , Figure 2 shown, S2 includes:

[0076] S21: Obtain a first reference point on the first end rib line. This first reference point can be any point on the first end rib line, preferably the lowest point of the first end rib line in the rib lines diagram. This setting facilitates the determination of the first reference point and also facilitates the selection of the height of the jig column 60 in the later stage.

[0077] S22: Draw the normal line of the first reference point. This normal line is the perpendicular line to the tangential line of the first reference point on the first end rib line, and obtain a second reference point on the normal line, where the distance between the second reference point and the first reference point is a. The value of a can be specifically selected according to production conditions, and the range is 600 mm - 1000 mm, preferably a = 800 mm. This setting can ensure the lowest jig installation cost and facilitate the welding construction of the curved outer plate.

[0078] S23: Draw the first jig reference line 11 perpendicular to the normal line through the second reference point; the included angle between the first jig reference line 11 and the ship baseline 20 is the transverse inclination angle A.

[0079] S24: Draw a parallel line of the first jig reference line tangent to the second end rib line.

[0080] S25: Draw the second jig reference line 12 parallel to the parallel line of the first jig reference line and with a distance of b, where b = a, preferably b = a = 800 mm. This setting can reduce the installation cost of the jig column 60 when installing the jig by keeping the two ends of the jig at the same distance from the jig reference plane 10, and also facilitates the calculation of the longitudinal inclination angle B in the later stage.

[0081] In a specific embodiment, as Figure 2 shown, S3 includes:

[0082] S31: Draw the center line 30 of the jig perpendicular to the first reference line 11 of the jig through the midpoint of the first end rib line, obtaining the center lines corresponding to the first end rib line, the second end rib line, and the middle rib line one by one.

[0083] S32: Obtain two first perpendicular projection points of the two endpoints of the first end rib line on the first reference line 11 of the jig, obtain two second perpendicular projection points of the two endpoints of the second end rib line on the second reference line 12 of the jig, and connect the first perpendicular projection point and the second perpendicular projection point at the same end to obtain the reference line 14 of the jig reference plane.

[0084] S33: Obtain two third perpendicular projection points of the two endpoints of the middle rib line on the reference line 14 of the jig reference plane, and connect the two third perpendicular projection points, which is the third reference line 13 of the jig.

[0085] In a specific embodiment, as Figures 2 - 7 shown, S4 includes:

[0086] S41: Take the center line 30 of the jig as the center and draw equally spaced elevation lines with a spacing of 1000 mm for the first end rib line, the second end rib line, and the middle rib line on both sides ( Figure 2 the dashed lines in).

[0087] S42: Vertically connect the two endpoints of the first end rib line, the second end rib line, and the middle rib line to the first reference line 11, the second reference line 12, and the third reference line 13 of the jig one by one to obtain the edge elevation lines ( Figure 2 the vertical connection lines of the endpoints of the first end rib line, the second end rib line, and the middle rib line to the jig reference plane 10 in).

[0088] S43: Create a cross-sectional view along the direction of the center line 30 of the jig, and calculate the longitudinal inclination angle B based on the theoretical rib pitch L from the first end rib line to the second end rib line and the center line height H of the first end rib line in the cross-sectional view. The calculation formula is: tan∠B = H / L.

[0089] In a specific embodiment, as Figure 2 , Figure 3 , Figures 8 - 15 shown, S5 includes:

[0090] S51: At the positions of the first end rib line, the second end rib line, and the middle rib line at the top of the beveled jig, numerical cutting templates 40 are provided one by one. The numerical cutting templates 40 have upper curved surfaces that fit the curved outer plate. The height parameters from the lower curved surfaces of the numerical cutting templates 40 to the jig reference plane 10 are obtained with reference to the thickness of the numerical cutting templates 40. Then, the numerical cutting templates 40, the jig columns 60 (made of auxiliary angle steel), the jig center line 30, the 600 mm horizontal inspection line 70, each longitudinal section line 80, and the marks 50 knocked with center punches are combined to form a sub-assembly jig template framework.

[0091] S52: According to the theoretical rib pitches of the first end rib line, the second end rib line, and the middle rib line, and the spacing of the height indication lines, the positioning diagram of the numerical cutting templates 40 on the jig reference plane 10 is obtained.

[0092] S53: Determine the connection positions of the numerical cutting templates 40 and the jig columns 60 according to the height parameters.

[0093] S54: Lift the template jig framework assembled and welded in the sub-assembly stage to the installation position on the jig reference plane 10, and install and fix the template jig framework according to the longitudinal inclination angle B.

[0094] Specific embodiments, such as Figures 1 - 17 As shown, a method for installing a double beveled jig for a curved outer plate, the method includes:

[0095] S1: Obtain the side view and rib line diagram of the curved section; among them, the rib line diagram includes four rib lines: F63 - 586, F68, F77, and F80 + 186.

[0096] S2: Obtain the jig reference plane 10 and the transverse inclination angle A; specifically:

[0097] S21: Obtain the lowest point of the F63 - 586 rib line as the first reference point.

[0098] S22: Draw the normal line of the first reference point, and obtain the second reference point on the normal line, where the distance between the second reference point and the first reference point is 800 mm.

[0099] S23: Draw the first jig reference line 11 perpendicular to the normal line through the second reference point; the included angle between the first jig reference line 11 and the ship's baseline 20 is the transverse inclination angle A, A = 30°.

[0100] S24: Draw a parallel line of the first jig reference line tangent to the F80 + 186 rib line.

[0101] S25: Draw the second jig reference line 12 parallel to the parallel line of the first jig reference line and at a distance of 800 mm. The plane determined by the first jig reference line 11 and the second jig reference line 12 is the jig reference plane 10.

[0102] S3: Obtain the center line 30 of the jig and the third reference line 13 of the jig; specifically:

[0103] S31: Pass through the midpoint of the F63 - 586 rib line to make the center line 30 of the jig perpendicular to the first reference line 11 of the jig. The center line 30 of the jig can intersect with the four rib lines of F63 - 586, F68, F77, F80 + 186, and the first reference line 11 of the jig, the second reference line 12 of the jig, and the two third reference lines 13 of the jig to obtain four center lines.

[0104] S32: Obtain two first vertical projection points of the two end points of the F63 - 586 rib line on the first reference line 11 of the jig, obtain two second vertical projection points of the two end points of the F80 + 186 rib line on the second reference line 12 of the jig, and connect the first vertical projection points and the second vertical projection points at the same end to obtain the reference line 14 of the jig reference plane.

[0105] S33: Obtain two third vertical projection points of the two end points of the F68 rib line and the F77 rib line on the reference line 14 of the jig reference plane, and connect the two third vertical projection points of the F68 rib line and the F77 rib line respectively, which are the two third reference lines 13 of the jig.

[0106] S41: Take the center line 30 of the jig as the center and make equidistant height indication lines with a spacing of 1000 mm for the F63 - 586 rib line, F80 + 186 rib line, F68 rib line, and F77 rib line on both sides respectively.

[0107] S42: Vertically connect the two end points of the F63 - 586 rib line, F80 + 186 rib line, F68 rib line, and F77 rib line to the first reference line 11 of the jig, the second reference line 12 of the jig, and the third reference line 13 of the jig one by one to obtain the edge height indication lines.

[0108] S43: Create a cross-sectional view along the direction of the center line 30 of the jig. Calculate the longitudinal inclination angle B based on the theoretical rib spacing L from the F63 - 586 rib line to the F80 + 186 rib line and the center line height H of the F63 - 586 rib line in the cross-sectional view. The calculation formula is: tan∠B = H / L. The longitudinal inclination angle ratio of the curved outer plate double bevel cutting jig is 1M:64.78 mm.

[0109] S51: Obtain the height parameters of the lower surface of the numerical cutting template 40 at the positions of the F63 - 586 rib line, F68 rib line, F77 rib line, and F80 + 186 rib line according to the numerical cutting template structure with a width * thickness of 300 mm * 18 mm; and obtain the numerical cutting template 40, auxiliary angle steel, the center line 30 of the jig, the 600 mm horizontal inspection line 70, each longitudinal section line 80, and the combination of the knocked - to center punch marks 50 to form a sub - assembly jig template frame, which is convenient for the subsequent rapid erection and positioning of the jig.

[0110] S52: Obtain the positioning drawing of the numerical cutting template 40 on the jig reference plane 10 according to the theoretical rib spacing of the F63 - 586 rib line, F68 rib line, F77 rib line, and F80 + 186 rib line and the spacing of the height indication lines.

[0111] S53: Determine the connection position between the numerical cutting template 40 and the jig column 60 according to the height parameters.

[0112] S54: Lift the template jig frame assembled and welded in the sub - assembly stage to the installation position on the jig reference plane 10, and install and fix the template jig frame according to the longitudinal inclination angle B.

[0113] As Figure 16 shown, after the installation of the double - bevel cutting jig is completed, hoist and assemble and weld the curved outer plate onto the jig. Sequentially hoist the rib plates, longitudinal girders, platform plates, and other internal structures, and perform assembly welding to form a complete product after the construction of the semi - three - dimensional segment of the curved outer plate at the bottom of the ship.

[0114] Compared with the prior art, the present invention has at least the following beneficial effects:

[0115] The present invention innovates the inverted construction method of the semi - three - dimensional segment of the curved outer plate at the bottom of the ship, that is, the innovative structure welding of the scattered outer plate turning over, into the design and construction mode concept of the double - bevel cutting jig for the curved outer plate; the present invention mainly optimizes and innovates the production and construction process technology, makes the construction of the semi - three - dimensional segment of the curved outer plate at the bottom of the ship faster, shortens the construction period, reduces the safety risks and construction difficulties of the operators, and the construction quality meets the requirements of the beautiful and accurate curve of the outer plate. By reducing one - time hoisting and turning over and planarizing the welding method of the operators, the production efficiency is improved, so that the entire ship construction process meets the technical requirements and better meets the needs of precision dimension control.

[0116] The technical method of the double - bevel cutting jig for the curved outer plate realizes the innovation of the production - line construction process, replaces the inverted construction mode of the semi - three - dimensional segment of the curved outer plate at the bottom, avoids the low efficiency of the highly complex three - dimensional operation, solves the internal structure welding problem and the assembly and positioning of the high support layer of the manufacturing tooling parts.

[0117] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A method for installing a double bevel cutting jig for a typical outer plate, characterized in that, it includes: S1: Obtain the side view and rib line drawing of the typical section; wherein, the rib line drawing includes a first end rib line, a second end rib line, and at least one middle rib line; S2: Obtain the jig reference plane (10) and the transverse inclination angle A; wherein, the jig reference plane (10) includes a first jig reference line (11) and a second jig reference line (12) arranged in parallel, and after translation, the first jig reference line (11) and the second jig reference line (12) can respectively correspond to and be tangent to the first end rib line and the second end rib line; the included angle between the first jig reference line (11) and the ship baseline (20) is the transverse inclination angle A; S3: Obtain the jig center line (30) and the third jig reference line (13); wherein, the jig center line (30) passes through the midpoint of the first end rib line and is perpendicular to the first jig reference line (11); the third jig reference line (13) corresponds to the middle rib line one by one, and the end points of the third jig reference line (13) are the vertical projections of both ends of the middle rib line on the jig reference plane (10); S4: Make elevation lines of the first end rib line, the second end rib line, and the middle rib line on both sides with the jig center line (30) as the center; and determine the longitudinal inclination angle B based on the theoretical rib pitch and center line height of the first end rib line, the second end rib line, and the middle rib line; S5: Complete the construction of the double bevel cutting jig with the theoretical rib pitch, elevation line values, and longitudinal inclination angle B of the first end rib line, the second end rib line, and the middle rib line; The S4 includes: S41: Make equidistant elevation lines of the first end rib line, the second end rib line, and the middle rib line on both sides with the jig center line (30) as the center; S42: Vertically connect the two end points of the first end rib line, the second end rib line, and the middle rib line with the first jig reference line (11), the second jig reference line (12), and the third jig reference line (13) one by one to obtain the edge elevation lines; S43: Create a cross-sectional view along the direction of the jig center line (30), and calculate the longitudinal inclination angle B with the theoretical rib pitch L from the first end rib line to the second end rib line and the center line height H of the first end rib line in the cross-sectional view. The calculation formula is: tan∠B = H / L.

2. The method for installing a double bevel cutting jig for a typical outer plate according to claim 1, characterized in that, the S2 includes: S21: Obtain the first reference point on the first end rib line; S22: Draw the normal line of the first reference point, and obtain the second reference point on the normal line. The distance between the second reference point and the first reference point is a; S23: Draw the first jig reference line (11) perpendicular to the normal line through the second reference point; the included angle between the first jig reference line (11) and the ship baseline (20) is the transverse inclination angle A; S24: Draw a parallel line of the first jig reference line tangent to the second end rib line; S25: Draw the second jig reference line (12) parallel to the parallel line of the first jig reference line and at a distance of b.

3. A method for installing a double bevel cutting jig for a curved outer plate according to claim 2, characterized in that, the first reference point is the lowest point of the first end rib line.

4. A method for installing a double bevel cutting jig for a curved outer plate according to claim 2, characterized in that, a = b = 800 mm.

5. A method for installing a double bevel cutting jig for a curved outer plate according to claim 1, characterized in that, S3 includes: S31: Draw a jig center line (30) perpendicular to the first jig reference line (11) through the midpoint of the first end rib line; S32: Obtain the first vertical projection points of the two end points of the first end rib line on the first jig reference line (11), obtain the second vertical projection points of the two end points of the second end rib line on the second jig reference line (12), and connect the corresponding first vertical projection points and second vertical projection points to obtain the jig reference plane reference line (14); S33: Connect the third vertical projection points of the two end points of the middle rib line on the corresponding jig reference plane reference line (14), which is the third jig reference line (13).

6. A method for installing a double bevel cutting jig for a curved outer plate according to claim 1, characterized in that, the distance between adjacent two of the equally spaced elevation lines is 1000 mm.

7. A method for installing a double bevel cutting jig for a curved outer plate according to claim 1, characterized in that, number cutting templates (40) are provided at corresponding positions of the first end rib line, the second end rib line and the middle rib line at the top of the double bevel cutting jig, and the number cutting templates (40) have upper curved surfaces that fit the curved outer plate.

8. A method for installing a double bevel cutting jig for a curved outer plate according to claim 7, characterized in that, S5 includes: S51: Obtain the height parameters from the lower curved surface of each number cutting template (40) to the jig reference plane with reference to the thickness of the number cutting template (40); S52: Obtain the positioning map of the number cutting templates (40) on the jig reference plane (10) according to the theoretical rib spacing of the first end rib line, the second end rib line and the middle rib line and the spacing of the elevation lines; S53: Determine the connection positions of the number cutting templates (40) and the jig columns (60) according to the height parameters; S54: Lift the template jig frame assembled and welded in the sub-assembly stage to the installation position on the jig reference plane (10), and install and fix the template jig frame according to the longitudinal inclination angle B.

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