A method for opening irregular holes on the curved surface of a ship

Abstract

The present invention provides a method for drilling irregular holes on a curved surface of a ship, comprising: determining the location of the hole to be drilled in a ship model, determining and cutting out a projection section according to the location of the hole; drawing an edge line of the hole according to the projection section; finding the straight portion of the edge line, replacing it with an arc, so that the edge line becomes an edge curve composed of curves, and placing the edge curve in a layer of the projection section; merging the edge curve composed of multiple curves into a complete curve; converting the merged curve into a spatial curve, and drilling the hole based on the spatial curve. The method of the present invention solves the problem that existing ship numerical control software cannot drill irregular holes on curved surfaces of ships, making it possible to drill irregular holes on curved surfaces by cutting, greatly improving on-site curved surface processing efficiency, reducing labor costs, and at the same time improving the accuracy of the drilling, ensuring the aesthetics of the drilling, and providing technical support for shortening the segmented construction period.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a method for opening irregular holes on a curved surface of a ship. Background Art

[0002] Modern ships often feature irregular holes in curved panels, similar to observation holes. However, ship design software lacks this functionality. AM software, for example, can only create holes with built-in regular patterns. Creating irregular holes on curved surfaces has always been a technical challenge. This inability to create irregular holes in curved surface models means the holes cannot be cut digitally, forcing the use of manual drilling. This significantly inconveniences on-site construction, increases difficulty, and reduces work efficiency. Furthermore, manual drilling results in poor precision control and unsightly appearance. Summary of the Invention

[0003] To solve the above problems, the present invention provides a method for opening irregular holes on a ship's curved surface. The method can be applied to existing ship numerical cutting control software, thereby realizing curved surface opening by numerical cutting.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for opening an irregular hole on a curved surface of a ship, comprising:

[0006] Determine the locations of holes to be opened in the ship model, and determine and cut out the projection section according to the locations of the holes;

[0007] According to the projection section, draw the edge line of the hole;

[0008] Find the straight part of the edge line and replace it with an arc to make the edge line into an edge curve composed of curves. Place the edge curve in the layer of the projection section.

[0009] Merge edge curves composed of multiple curves into a complete curve;

[0010] The merged curves are converted into space curves, and holes are opened based on the space curves.

[0011] As a preferred embodiment, the projection cross section is a cross section obtained by intersecting the hull with a plane on the spatial coordinate axis.

[0012] As a preferred implementation, the chord height value of the arc is determined according to the curve recognition accuracy.

[0013] As a preferred implementation, the chord height value of the arc is a minimum chord height value that enables the arc to be identified as a curve.

[0014] As a preferred embodiment, when edge curves are merged, the endpoints of the closed curves are located at the short sides.

[0015] The method for drilling irregular holes on the curved surface of a ship provided by the present invention changes the original method of only being able to drill regular holes provided by the software to a method of drilling holes by drawing hole edge curves, thereby solving the problem that the existing ship CNC software cannot drill irregular holes on the curved surface of a ship. Irregular holes on the curved surface can be drilled by digital cutting, which greatly improves the efficiency of on-site curved surface processing, reduces labor costs, and at the same time improves the accuracy of the drilling, ensures the aesthetics of the drilling, and provides technical support for shortening the segmented construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the irregular hole edge curve of the present invention.

[0017] Figure 2 This is a schematic diagram of the edge curve arc replacing the straight line according to the present invention.

[0018] Figure 3 This is a schematic diagram of the command for opening a hole in a curved panel frame according to the present invention.

[0019] Figure 4 This is a schematic diagram of a curved panel part with irregular holes according to the present invention.

[0020] Among them, 1-arc, 2-straight line, 3-space curve name filling option, 4-opening method option, 5-irregular hole. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] In the examples, the method of the present invention is applied to the most common AM software currently available, and the implementation of the present invention is explained in conjunction with the specific operation process of the AM software. The method of the present invention can also be applied to other ship numerical control software that can achieve the same basic functions.

[0023] The method of the present invention comprises the steps of:

[0024] S1. Based on the ship design drawings, determine the location of the holes in the ship model. Determine the projected sections (transverse section X, longitudinal section Y, and horizontal section Z) based on the hole locations. Intersect the hull using a plane in the spatial coordinate system at the determined locations to create the projected curves. The Section function within the AM software can be used to create sections in a specific viewing direction (X, Y, Z).

[0025] S2. Based on the projection cross section of the hole, draw the projection edge line of the irregular hole on the curved surface. The edge line is a closed line composed of curves and straight lines, such as Figure 1 shown.

[0026] S3. Find the straight line component in the edge line and change it into an arc with a chord height of 3mm (such as Figure 2 As shown in the figure), ensure that there are no straight lines in the edge line, so as to obtain the edge curve composed of pure curves, and place the edge curve in the layer of the projected section;

[0027] A chord height of 3 mm is the minimum value of a curve that can be used to drill a hole in the AM model, that is, the minimum value of a curve that can be identified. A chord height greater than 3 mm can also be identified as a curve, but the drilling accuracy will be reduced.

[0028] S4. Merge multiple edge curves into a single, complete curve. This can be accomplished using the curve merging function in the AM software. When merging curves, select Close the seam on the short edge.

[0029] The edge lines of the hole have long sides and short sides. The merged curve will have a point selection position. After testing, it is possible that the hole cannot be opened at the seam of the long side if the point selection position is selected. This problem can be avoided by clicking the position on the short side.

[0030] S5. Use the Apply Curve function in the AM software to convert the merged curve into a space curve. Then, use the AM hole-making function to create a hole on the surface based on the space curve. This includes the following steps:

[0031] Through the AM software curved panel frame opening function, in the curved panel frame opening command interface, enter the space curve name into the opening specification option Designation, and select the saved curve Asstored option in the opening method Hole Along option to open the hole (such as Figure 3 shown).

[0032] Figure 4 The figure is a schematic diagram of a curved panel part with irregular holes obtained using the above method.

[0033] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. For ordinary technicians in this field, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be regarded as the scope of protection of the present invention.

Claims

1. A method for drilling irregular holes on a curved surface of a ship, characterized in that: include: Determine the locations of holes to be opened in the ship model, and determine and cut out the projection section according to the locations of the holes; According to the projection section, draw the edge line of the hole; Find the straight part of the edge line and replace it with an arc to make the edge line into an edge curve composed of curves. Place the edge curve in the layer of the projection section. Merge edge curves composed of multiple curves into a complete curve; The merged curves are converted into space curves, and holes are opened based on the space curves.

2. The hole-opening method according to claim 1, characterized in that: The projection cross section is a cross section obtained by intersecting the hull with a plane on the spatial coordinate axis.

3. The hole-making method according to claim 1, characterized in that: The chord height value of the arc is determined according to the curve recognition accuracy.

4. The hole-making method according to claim 1 or 3, characterized in that: The chord height value of the arc is the minimum chord height value that enables the arc to be identified as a curve.

5. The hole-making method according to claim 1, characterized in that: When edge curves are merged, the endpoints of the closed curve are located on the shorter edge.

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