A method for cutting bow door of a ship
By calculating the angle and offset of the bow door outer plate, and using a drilling machine and a semi-automatic cutting knife to mark the cutting line on the outer edge of the bow door outer plate, the problem of inaccurate cutting in the existing technology is solved, and a fast, accurate cutting effect and aesthetics are achieved.
Patent Information
- Application Number
- CN202311321364.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-12
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2043-10-12
AI Technical Summary
In the prior art, during the cutting process of the bow door of a ship, the cumulative errors lead to inaccurate cutting, which affects the appearance of the bow door structure and the quality of the cutting seam.
By calculating the angle and offset of the bow door outer plate, a drilling machine is used to drill holes on the inner edge and mark the cutting line on the outer edge. Combined with a semi-automatic cutting knife, segmented cutting is performed to ensure the accuracy and aesthetics of the cutting line.
It can quickly and accurately draw cutting lines, improve cutting efficiency and the aesthetics of the bow door cutting seam, and reduce structural damage caused by errors.
Smart Images
Figure CN117381317B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a ship bow door cutting method. Background Art
[0002] The bow door of a ro-ro passenger ferry is the front face of the ferry, so the smoothness of its construction lines and the beauty of its cutting seams are crucial to the entire ship. The bow door is built in three sections first, and then it is fully closed. After the full closing, the bow door is cut as a whole. Due to the complex internal structure of the bow door, the bow door cannot be cut from the inside, and the cutting operation can only be carried out on the outer edge of the outer plate. To cut on the outer edge of the outer plate, the cutting line needs to be accurately drawn. The method required in the early stage is to use a total station to find the cutting line after the full closing. In theory, this is feasible, but due to the cumulative errors in the construction of sections and the closing process, there will be cumulative errors when using a total station to find the points. If the points are not found accurately, the bow door structure will be cut during cutting, which will cause the problem of excavating and replacing the bow door structure. Summary of the Invention
[0003] In view of the above problems, the present invention provides a ship bow door cutting method, which can quickly and accurately draw the cutting line, facilitate on-site rapid cutting operations, improve work efficiency, and ensure the beauty of the bow door cutting seam.
[0004] To achieve the above object, the present invention adopts the following technical solutions:
[0005] A method for cutting a bow door of a ship comprises the following steps:
[0006] S1. Determine the location of the bow door gap, specifically including the following steps: S11. Calculate and analyze the angle of the bow door outer plating in relation to the hull line, and calculate the offset from the inner edge of the drilling hole to the outer edge; S12. Mark the bow door outer plating twice based on the bow door segmentation, and mark the actual drilling location on the inner edge of the bow door outer plating according to the offset. Use a sample punch to create a turning point at the drilling location on the inner edge of the bow door outer plating, and then use a drilling machine to drill to the outer edge of the bow door outer plating;
[0007] S2. Bow door seam marking;
[0008] S3. Cutting and shaping of bow door seam.
[0009] Furthermore, the angle of the hull line is the angle between the tangent line at the location of the seam drilling point and the hull base surface, that is, the bow door outer plate line angle α; its calculation method is to measure the angle by the TRIBON drawing adjustment tool based on the tangent line at the door seam position in the line drawing; since the curvature and position of the outer plate line at each drilling point are different, the angle is also different, and the angle is calculated for each door seam drilling point.
[0010] Furthermore, the offset is calculated as T*tanα, where T is the thickness of the bow door outer plate.
[0011] Furthermore, in step S1, the drilling process of the drilling machine must be perpendicular to the bow door outer plate.
[0012] Furthermore, step S2 is specifically to drill holes on the curved outer plate at the outer edge of the outer plate of the ship according to the drill holes in step S1 after the bow gate is formed in sections, and connect the drill holes with spline lines according to the line type of the cutting line on the drawing. After the connection is completed, the bow gate cutting line is formed, and then a 100 inspection line of the cutting line is drawn for later inspection of the cutting accuracy.
[0013] Furthermore, the step S3 specifically includes the following steps:
[0014] S31. Divide the bow door seam cutting line into areas, and then divide each area into sections;
[0015] S32. Use a semi-automatic cutter to cut in sections according to the cutting process and the cutting line. First, use the cutter to make a trial cut. During the trial cut, the center of the cutting nozzle must coincide with the cutting line. After the cutter is adjusted into place, perform the formal cutting. During the formal cutting, the cutting nozzle of the cutter must always keep cutting in the horizontal direction.
[0016] Furthermore, in step S31, the bow door seam cutting lines on the port and starboard sides are symmetrically divided into 8 areas, each area is segmented with 1000 to 1500 mm, and the interval between two adjacent segments is 150 to 200 mm; the cutting order of the 8 areas is the areas at the rear and front of the bow door cutting line, the uppermost area on the bow door cutting line, the lowermost area on the bow door cutting line, and the symmetrical cutting of the bow door seams on the port and starboard sides; after the segment cutting in all areas is completed, the intervals between adjacent segments are cut in sequence, and at this point, the bow door cutting is completed.
[0017] Furthermore, when cutting the segments within each area, the cutting is performed in a clockwise direction.
[0018] Furthermore, the order of cutting the intervals is first the intervals in the rear area of the bow door, then the intervals in the front area of the bow door, then the intervals in the upper area of the bow door, and finally the intervals in the lower area of the bow door. The intervals on both sides are cut symmetrically and in sections and regions; the intervals in each area are cut in a clockwise direction.
[0019] By adopting the ship bow door cutting method of the present invention, firstly, the exact position of each point that needs to be drilled on the curved outer plate of the curved line type can be accurately calculated, providing data support for accurately drawing the drilling point position based on the secondary marking; secondly, by accurately drawing the drilling position, the exact position of the bow door cutting line is marked on the outer edge of the outer plate by drilling, providing a basis for subsequently accurately drawing the bow door cutting line on the outer edge of the outer plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the bow door seam line of the present invention.
[0021] Figure 2 Schematic diagram of the drilling point offset described in the present invention.
[0022] Figure 3 It is a schematic diagram of the cutting division of the bow door seam according to the present invention.
[0023] Figure 4 It is a schematic diagram showing the interval cutting and dividing of the bow door seam according to the present invention.
[0024] Figure 5 It is a schematic diagram of the bow door gap after forming according to the present invention.
[0025] Among them, 1- bow door seam line, 2- offset, 3- bow door seam center line, 4- bow door seam, 5- drilling machine. DETAILED DESCRIPTION
[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0027] like Figure 1-Figure 5 As shown, a method for cutting a bow door of a ship comprises the following steps:
[0028] S1. Determine the location of the bow door gap, specifically including the following steps: S11. Calculate and analyze the angle of the bow door outer plate at the hull line, and calculate the offset from the inner edge drilling to the outer edge; S12 Mark the bow door outer plate twice based on the bow door segmentation. Draw the actual drilling position on the inner edge of the bow door outer plate according to the offset. First, use a sample punch to knock a turning point at the drilling position on the inner edge of the bow door outer plate. Then use a drilling machine to drill to the outer edge of the bow door outer plate. The drilling process of the drilling machine must be perpendicular to the bow door outer plate. The angle of the hull line is the angle between the tangent at the seam drilling point and the hull base surface, which is the bow door outer plate line angle α. The calculation method is to use the tangent at the door seam position in the line drawing and measure the angle using the TRIBON drawing adjustment tool. Since the outer plate line curvature and position of each turning point are different, the angle is also different. The angle needs to be calculated for each door seam drilling point. The offset is calculated as the bow door outer plate thickness T*tanα.
[0029] S2. Marking the bow door seam. Specifically, after the bow door is formed in sections, drill holes in the curved outer plating at the outer edge of the ship's outer plating according to step S1. Connect the drill holes with spline lines according to the line pattern of the cutting line on the drawing. Once the connection is completed, the bow door cutting line is formed. Then, a 100-degree inspection line is drawn on the cutting line for later verification of cutting accuracy.
[0030] S3. The bow door seam cutting and forming comprises the following steps: S31. The bow door seam cutting line is divided into regions, and each region is segmented;
[0031] S32. Use a semi-automatic cutter to cut in sections according to the cutting process and the cutting line. First, use the cutter to make a trial cut. During the trial cut, the center of the cutting nozzle must coincide with the cutting line. After the cutter is adjusted into place, perform the formal cutting. During the formal cutting, the cutting nozzle of the cutter must always keep cutting in the horizontal direction.
[0032] like Figure 3 As shown, in step S31, the bow door seam cutting lines on the port and starboard sides are symmetrically divided into 8 areas A to H, each area is segmented with a length of 1000 to 1500 mm, the numbers in each area are the cutting order of the segments in the area, and the intervals between adjacent ends are 150 to 200 mm; the cutting order of the 8 areas is the front and rear areas of the bow door cutting line, the uppermost area of the bow door cutting line, the lowermost area of the bow door cutting line, and the symmetrical cutting of the bow door seams on the port and starboard sides; after the segment cutting in all areas is completed, the intervals between adjacent segments are cut in sequence, and the bow door cutting is completed.
[0033] When cutting the segments within each area, cut in a clockwise direction.
[0034] like Figure 4 As shown, the intervals are cut in the order of the area behind the bow door, then the area in front of the bow door, then the area above the bow door, and finally the area below the bow door. The intervals on both sides are cut symmetrically and in sections and regions. The intervals in each area are cut in a clockwise direction. The letter numbers in each area represent the seven orders of the intervals in that area.
[0035] Those skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A method for cutting a bow door of a ship, characterized in that: The following steps are involved: S1. Determine the position of the bow door seam, specifically including the following steps: S11. Calculate and analyze the angle of the hull line at which the bow door outer plate is located, and calculate the offset from the inner edge drilling to the outer edge; the hull line angle is the angle between the tangent line at the position of the seam drilling point and the hull base surface, that is, the bow door outer plate line angle α; the calculation method is to measure the angle using the TRIBON drawing adjustment tool based on the position tangent line of the seam in the line drawing; since the curvature and position of the outer plate at each drilling point are different, the angle is also different, and the angle is calculated for each door seam drilling point; S12. Mark the bow door outer plate twice according to the bow door segmentation, draw the actual drilling position on the inner edge of the bow door outer plate according to the offset, first use a sample punch to knock a turning point at the drilling position on the inner edge of the bow door outer plate, and then use a drilling machine to drill to the outer edge of the bow door outer plate; S2. Bow door seam marking; S3. Cutting and shaping of bow door seam.
2. A method for cutting a bow door of a ship according to claim 1, characterized in that: The offset is calculated as T*tanα, where T is the thickness of the bow door outer plate.
3. A method for cutting a bow door of a ship according to claim 2, characterized in that: In step S1, the drilling process of the drilling machine must be perpendicular to the bow door outer plate.
4. A method for cutting a bow door of a ship according to claim 3, characterized in that: Specifically, step S2 is to drill holes on the curved outer plate at the outer edge of the ship's outer plate after the bow gate is formed in sections by being closed together in step S1, and to connect the holes with spline lines according to the line type of the cutting line on the drawing. After the connection is completed, the bow gate cutting line is formed, and then a 100 inspection line of the cutting line is drawn for later inspection of the cutting accuracy.
5. A method for cutting a bow door of a ship according to claim 4, characterized in that: Said step S3 specifically comprises the following steps: S31. Divide the bow door seam cutting line into areas, and divide each area into segments; S32. Use a semi-automatic cutting knife to cut the segments along the cutting line according to the cutting process. First, use the cutting knife to make a trial cut. During the trial cut, the center of the cutting nozzle must coincide with the cutting line. After the cutting knife is adjusted into place, the formal cutting is carried out. During the formal cutting, the cutting knife and the cutting nozzle must always keep cutting in the horizontal direction.
6. A method for cutting a ship bow door according to claim 5, characterized in that: In step S31, the bow door seam cutting lines on the port and starboard sides are symmetrically divided into 8 areas, each area is segmented with a size of 1000-1500 mm, and the interval between two adjacent areas is 150-200 mm; the cutting order of the 8 areas is the areas at the rear and front of the bow door cutting line, the uppermost area on the bow door cutting line, the lowermost area on the bow door cutting line, and the bow door seams on the port and starboard sides are symmetrically cut; after the segment cutting in all areas is completed, the intervals between adjacent segments are cut in sequence, and at this point, the bow door cutting is completed.
7. A method for cutting a ship bow door according to claim 6, characterized in that: When cutting the segments within each area, cut in a clockwise direction.
8. A method for cutting a ship bow door according to claim 7, characterized in that: The order of cutting the intervals is first the intervals in the area behind the bow door, then the intervals in the area in front of the bow door, then the intervals in the area above the bow door, and finally the intervals in the area below the bow door. The intervals on both sides are cut symmetrically and in sections and regions; the intervals in each area are cut in a clockwise direction.
Citation Information
Patent Citations
Ship air scuttle arranging method and ship
CN110371240A
Hull building process
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