A lofting method of positive and negative hyperbolic outer plate

Abstract

The embodiment of the application provides a lofting method of positive and negative double-curved outer plates, and belongs to the field of shipbuilding. By using the method, the outer plate parts with positive and negative double curves can be accurately lofted, the outer plate parts are unfolded, the accuracy is high, the reliability is strong, no allowance needs to be added to compensate for the size deviation, and necessary machining lines are arranged on the parts, so that the molding and machining are facilitated. The method is simple to operate, can save plate cost, and improves production efficiency.

Description

Technical Field

[0001] This application relates to the field of shipbuilding technology, and in particular to a method for laying out a hyperbolic outer plate. Background Technology

[0002] Ship hulls are generally irregularly curved, with various curved outer plate parts, especially those with both positive and negative curvature. Current modeling software can only unfold positive or negative curvature outer plates. For positive and negative hyperbolic outer plates, it cannot be accurately unfolded; instead, a certain allowance is added to compensate for dimensional deviations. This requires timely trimming after processing, wasting sheet metal, increasing workload, and reducing production efficiency. Summary of the Invention

[0003] This invention proposes a method for laying out hyperbolic outer plates, belonging to the field of shipbuilding. Using this method, outer plate parts with both hyperbolic and non-hyperbolic shapes can be accurately laid out. The unfolded outer plate parts have high accuracy and reliability, eliminating the need for allowances to compensate for dimensional deviations. Furthermore, the parts have necessary machining lines for convenient forming and processing. This method is simple to operate, saves on sheet metal costs, and improves production efficiency.

[0004] This invention provides a method for lofting a hyperbolic outer plate, characterized in that the method includes:

[0005] Based on the characteristics of the longitudinal section and waterline of the outer plate, the projection method is used to divide the horizontal projection line equally in the longitudinal section diagram, and project the dividing points onto the corresponding waterline in the waterline diagram to obtain the length X of each waterline segment.

[0006] Draw perpendicular lines to the center line from the points where the horizontal projection lines on the longitudinal section are equally divided, to obtain the length Y of each segment of the center line; in the longitudinal section, measure the spacing M of each segment of the horizontal projection lines along the center line.

[0007] Using the center-to-center spacing M of each waterline, the length Y of the perpendicular foot of the horizontal projection line along the center line, and the length X of each waterline segment, unfold each waterline, connect the two endpoints of the waterline, and complete the layout of the positive and negative hyperbolic outer plate.

[0008] The above-described embodiment of the present invention provides a method for laying out a hyperbolic outer plate, which is simple to operate, highly accurate, reliable, and versatile. It can be used to lay out hyperbolic outer plates of ship hulls, but is not limited to outer plates. It can improve work efficiency and save production costs. Attached Figure Description

[0009] The accompanying drawings illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0010] Figure 1 It features a double-curved outer panel design;

[0011] Figure 2 To divide the long image into equal parts;

[0012] Figure 3 For the unfolding process diagram;

[0013] Figure 4 For parts and machining sample drawings. Detailed Implementation

[0014] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0015] In the embodiments described in this application, it should be noted that, unless otherwise stated and limited, the term "connection" should be interpreted broadly. For example, it can be an electrical connection, or a connection between two internal components. It can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above term according to the specific circumstances.

[0016] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0017] This invention provides a method for laying out a hyperbolic outer plate. Based on the characteristics of the longitudinal section and waterline of the outer plate, a projection method is used. In the longitudinal section diagram, the horizontal projection lines are equally divided, and the division points are projected onto the corresponding waterlines in the waterline diagram to obtain the length X of each waterline segment. Through the division points of the horizontal projection lines on the longitudinal section diagram, a perpendicular line is drawn to the center line to obtain the length Y of each centerline segment. In the longitudinal section diagram, the spacing M of each horizontal projection line segment is measured along the center line. Using the center spacing M of each waterline, the length Y of the perpendicular from the division points of the horizontal projection lines to the center line along the center line, and the length X of each waterline segment, each waterline is unfolded, and the endpoints of the two waterlines are connected to complete the laying out of the hyperbolic outer plate.

[0018] The implementation and steps of the method of the present invention will be described in detail with reference to the accompanying drawings:

[0019] Figure 1Figure (1)a is a longitudinal section diagram, and Figure (1)b is a waterline diagram. The hyperbolic outer plate in the figure involves five waterlines. The upper and lower waterlines are the board seam lines, and the side seam lines are symmetrical. The waterlines are concave inward for the positive curve, and the longitudinal center line is concave outward for the negative curve. The waterlines in the longitudinal section diagram are projections, and the center line is the true shape; the waterlines in the waterline diagram are the true shape at that location, and the center line is the projection.

[0020] Figure 2 It is a diagram of equal division of the actual length, where Figure (2)a is a longitudinal section diagram and Figure (2)b is a waterline diagram. Taking the upper plate seam (3500 waterline) as an example, the steps are as follows:

[0021] 1. On the longitudinal section diagram, divide the 3500 waterline projection line into n equal parts. Here, we take five equal parts to obtain five points a, b, c, d, and e. Project each point downwards onto the corresponding waterline in the waterline diagram to obtain points a″, b″, c″, d″, and e″.

[0022] 2. On the waterline diagram, measure the arc lengths of segments a"b", b"c", c"d", and d"e" along the waterline to obtain the actual length values ​​of X1, X2, X3, and X4;

[0023] 3. On the longitudinal section diagram, draw perpendicular lines to the center line through points b, c, d, and e, with the feet of the perpendiculars at points b′, c′, d′, and e′, respectively. Measure the arc lengths of segments ab′, b′c′, c′d′, and d′e′ along the center line to obtain the actual length values ​​of Y1, Y2, Y3, and Y4;

[0024] 4. On the longitudinal section diagram, measure the arc length between each waterline along the center line to obtain the actual length values ​​of M1, M2, M3, and M4.

[0025] Repeat steps 1, 2, and 3 above for each of the other waterlines to obtain their respective X and Y actual length values. Connecting the points where each waterline is divided into equal parts yields the equally divided projection lines.

[0026] Figure 3 This is a diagram of the outer panel unfolding process. Taking the upper panel seam (3500 water line) as an example, the steps are as follows:

[0027] 1. Draw mutually perpendicular cross segments, with the foot of the perpendicular being a". The vertical line segment Ya is used as the center line of the expansion, and the horizontal line segment La is used as the water line.

[0028] 2. Using the actual lengths of Y1, Y1+Y2, Y1+Y2+Y3, and Y1+Y2+Y3+Y4 as intervals, draw horizontal parallel lines to obtain line segments L1, L2, L3, and L4.

[0029] 3. Using the intersection point a” of the cross lines in step 1 as the center, draw an arc with the actual length of X1 as the radius. The intersection on L1 is b”; using b” as the center, draw an arc with the actual length of X2 as the radius. The intersection on L2 is c”; using c” as the center, draw an arc with the actual length of X3 as the radius. The intersection on L3 is d”; using d” as the center, draw an arc with the actual length of X4 as the radius. The intersection on L4 is e”; similarly, the other side point can be obtained by using the center line as the axis of symmetry.

[0030] 4. Smoothly connect each point in sequence to obtain the unfolded 3500 waterline.

[0031] 5. Using the actual lengths of M1, M1+M2, M1+M2+M3, and M1+M2+M3+M4 as intervals, draw lines parallel to line segment La to obtain line segments Lb, Lc, Ld, and Le.

[0032] 6. Starting with Lb, Lc, Ld, and Le respectively, repeat steps 2, 3, and 4 above to expand the remaining water lines.

[0033] Figure 4 These are unfolded parts and machining sample drawings. Among them, Figure (4)a is the unfolded outer plate part, Figure (4)b is the positive curve waterline machining sample, and Figure (4)c is the reverse curve longitudinal center sample.

[0034] The technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for laying out a hyperbolic outer plate, characterized in that, The method includes: Based on the characteristics of the longitudinal section and waterline of the outer plate, the projection method is used to divide the horizontal projection line equally in the longitudinal section diagram, and project the dividing points onto the corresponding waterline in the waterline diagram to obtain the length X of each waterline segment. Draw perpendicular lines to the center line from the points where the horizontal projection lines on the longitudinal section are equally divided, to obtain the length Y of each segment of the center line; in the longitudinal section, measure the spacing M of each segment of the horizontal projection lines along the center line. Using the center-to-center spacing M of each waterline, the length Y of the perpendicular foot of the horizontal projection line along the center line, and the length X of each waterline segment, unfold each waterline, connect the two endpoints of the waterline, and complete the layout of the positive and negative hyperbolic outer plate.

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