A method of cutting a bridge in a hull plate part and a cutting bridge
By using a guide circle-shaped bridge cutting path, the problems of bridge cuts and incomplete melting in existing technologies are solved, achieving efficient and precise cutting of hull plates and improving overall cutting efficiency and part accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI MERCHANT SHIP DESIGN & RES INST
- Filing Date
- 2026-03-27
- Publication Date
- 2026-05-29
AI Technical Summary
In the current process of cutting ship hull plate parts, the bridge is prone to cutting the parts and the bridge is not completely melted, which leads to the need for manual cutting and reduces the cutting efficiency.
The bridge cutting path adopts a guide circle form, and the elliptical residual material is removed through the first and second cutting paths. Combined with the appropriate bridge width and guide circle radius, the bridge is directly melted off, avoiding manual cutting.
It improves cutting efficiency, avoids the step of manually cutting across the bridge, ensures accurate cutting of parts and is less likely to cause contour damage, and the cutting head runs smoothly and continuously, reducing the need for re-ignition.
Smart Images
Figure CN122099652A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a bridge for cutting ship hull plate parts and a cutting method, belonging to the field of ship hull plate cutting technology. Background Technology
[0002] Ship hull parts are cut using CNC cutting equipment, typically plasma cutters or laser cutters. When cutting hull parts, the cutting head is usually positioned at the part's initiation point before ignition. However, when a single cutting plate contains numerous small parts such as patch plates or elbow plates, repeatedly positioning and igniting each small part not only fails to improve the overall cutting efficiency but also negatively impacts the cutting head's lifespan due to frequent ignition.
[0003] To improve cutting efficiency and reduce the number of times the cutting head needs to be ignited, bridges are typically used to connect small parts to larger parts or to connect multiple small parts together. This eliminates the need for individual ignition and cutting of each small part, thus improving cutting efficiency.
[0004] Currently, most bridges are formed by directly adding rectangular bridges between parts (e.g., ...). Figure 1 The width is usually a fixed value between 5 and 10 mm.
[0005] Therefore, during the cutting of hull parts, for small or long structural components, adding a bridge reduces the number of times the cutting head needs to be ignited, improving cutting efficiency or preventing deformation of long components. However, bridges can easily damage parts or leave residue on the parts after cutting, requiring manual cutting, which reduces cutting efficiency and affects the shipbuilding cycle. Summary of the Invention
[0006] The technical problem that this invention aims to solve is that in existing ship hull plate cutting bridges, the cutting head is located at the junction of the part and the bridge (rectangular right angle position), which easily damages the part, and the final part thickness is not completely melted through the bridge, resulting in the need for manual cutting of the bridge, thereby reducing cutting efficiency.
[0007] This invention aims to provide a cutting bridge and cutting method for ship hull plate parts. During the cutting process, the bridge is directly melted and cut off, eliminating the need for manual cutting, thereby improving the efficiency of parts sorting. At the same time, the bridge width and cutting radius are adjusted according to the thickness of the parts, making the parts cutting more precise and efficient.
[0008] The present invention adopts the following technical solution:
[0009] A cutting bridge for ship hull plate parts, at the bridge between adjacent parts: the cutting machine forms a first cutting path with a first transition arc 1, a first straight line 5, and a second transition arc 2; the cutting machine forms a second cutting path with a third transition arc 3, a second straight line 6, and a fourth transition arc 4; the first cutting path and the second cutting path intersect to remove a type of elliptical excess material.
[0010] Preferably, the first transition arc 1 and the third transition arc 3 are 90° arcs, and the first straight line 5 and the second straight line 6 are of equal length.
[0011] Furthermore, the second transition arc 2 and the fourth transition arc 4 are also 90° arcs, at which point the edges of adjacent parts are parallel to each other.
[0012] Furthermore, the first transition arc 1, the second transition arc 2, the third transition arc 3, and the fourth transition arc 4 have the same arc length, and their radii are the same as the guide circle radius.
[0013] Furthermore, the distance between the first straight line 5 and the second straight line 6 is equal to the radius of the guide circle.
[0014] Furthermore, the radius of the guide circle has a fixed ratio to the thickness of the plate material of the part.
[0015] A method for cutting the bridge between adjacent hull plate parts, as described above, involves the cutting machine cutting the bridge between adjacent parts as follows:
[0016] S1. A first cutting path is formed by the first transition arc 1, the first straight line 5, and the second transition arc 2, and then the path is reversed.
[0017] S2. A second cutting path is formed by following the third transition arc 3, the second straight line 6, and the fourth transition arc 4; the first cutting path intersects with the second cutting path to remove a type of elliptical excess material.
[0018] Preferably, the guide radii of the first transition arc 1, the second transition arc 2, the third transition arc 3, and the fourth transition arc 4 are equal, and the guide radius is kept in a fixed ratio with the thickness of the part plate.
[0019] Furthermore, the fixed ratio is 1:1.
[0020] Preferably, the method further includes step S3: removing the protrusions left at the edge of the part due to the removal of the excess material.
[0021] This invention features a guide circle-shaped bridge for both entry and exit, which differs from the right-angle entry and exit of traditional bridges. Its advantages are as follows:
[0022] 1) The bridge is directly melted during the cutting process, eliminating the need for manual cutting, thereby improving the efficiency of sorting parts.
[0023] 2) The cutting head moves smoothly and continuously, without requiring re-ignition in the middle section;
[0024] 3) Adjust the bridge width and the guide circle radius according to the thickness of the part to make the part cutting more precise and efficient; match the plate thickness with the width, guide circle and the size of the intersection of the bridge, so that the bridge can be melted without cutting the part.
[0025] 4) Since there is no need to cut the bridge separately, it is less likely to cause damage to the outline of the parts. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the cutting of ship hull plate parts across a bridge in the existing technology.
[0027] Figure 2 This is a schematic diagram illustrating the cutting bridge for ship hull plate parts of the present invention, which selects different guide circle radii for plate of different thicknesses.
[0028] Figure 3 yes Figure 2 A magnified view of a portion of the image on the right.
[0029] Figure 4 This is a schematic diagram of the cutting path of the cutter in this invention. Red indicates the first cutting path, green indicates the second cutting path, and t represents the thickness of the sheet metal.
[0030] Figure 5 This is a schematic diagram of a cut hull plate in one embodiment of the present invention.
[0031] Figure 6 Is Figure 5 A diagram showing the cutting path marked by the general.
[0032] Figure 7 Is with Figure 5 The corresponding diagram.
[0033] Figure 8 yes Figure 7 The image shows an enlarged view of a cut-off scrap area.
[0034] In the diagram, 1. First transition arc, 2. Second transition arc, 3. Third transition arc, 4. Fourth transition arc, 5. First straight line, 6. Second straight line. Detailed Implementation
[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0036] Example 1 (Prior Art):
[0037] See Figure 1 , Figure 1 The diagram illustrates a prior art structure for cutting bridges between hull plate parts. The bridge is 5mm wide, and the spacing between adjacent plates is 10mm. These bridges will subsequently need to be removed.
[0038] When cutting the hull plate parts, the cutter head is located at the junction of the part and the bridge (at the right angle of the rectangle), which easily damages the part. Furthermore, the thickness of the part that is finally cut does not completely melt the bridge, which requires manual cutting of the bridge, thus reducing the cutting efficiency.
[0039] Example 2:
[0040] See Figure 2-8 A bridge for cutting hull plate parts, where the bridge between adjacent parts is formed by the cutting machine following a first transition arc 1, a first straight line 5, and a second transition arc 2 to create a first cutting path that turns back.
[0041] The cutting machine forms a second cutting path following the third transition arc 3, the second straight line 6, and the fourth transition arc 4; the intersection of the first and second cutting paths removes a type of elliptical excess material, such as... Figure 8 As shown.
[0042] In this embodiment, see Figure 8 The first transition arc 1 and the third transition arc 3 are 90° arcs, and the first straight line 5 and the second straight line 6 are of equal length. It should be noted that the first straight line 5 and the second straight line 6 are not necessarily parallel at this point, but... Figure 8 The case where the two are not parallel is not shown.
[0043] Further details can be found by referring to [link / reference]. Figure 8 The second transition arc 2 and the fourth transition arc 4 are also 90° arcs. At this time, the edges of adjacent parts are parallel to each other. This situation is similar to... Figure 8 The results are completely consistent.
[0044] See also Figure 8 The first transition arc 1, the second transition arc 2, the third transition arc 3, and the fourth transition arc 4 have equal arc lengths, and their radii are equal to the guide circle radius. The distance between the first straight line 5 and the second straight line 6 is equal to the guide circle radius.
[0045] In this embodiment, the guide circle radius has a fixed ratio to the plate thickness of the part; that is, the size of the guide circle radius is not fixed, but determined according to the plate thickness. For example... Figure 2When the plate thickness t=15mm, the guide radius R is 5mm, and when the plate thickness t=12mm, the fillet radius R is 4mm.
[0046] The above-mentioned cutting method for the bridge of hull plate parts involves the cutting machine cutting the bridge between adjacent parts as follows:
[0047] S1. A first cutting path is formed by the first transition arc 1, the first straight line 5, and the second transition arc 2, and then the path is reversed.
[0048] S2. A second cutting path is formed by following the third transition arc 3, the second straight line 6, and the fourth transition arc 4; the first cutting path intersects with the second cutting path to remove a type of elliptical excess material.
[0049] In this method, the guide radii of the first transition arc 1, the second transition arc 2, the third transition arc 3, and the fourth transition arc 4 are equal, and the guide radius is kept in a fixed ratio with the thickness of the part plate.
[0050] The method also includes step S3: removing the protruding portion left at the edge of the part due to the removal of the excess material. Figure 8 Remove the shaded areas in the image.
[0051] The following examples illustrate this:
[0052] The components are categorized and matched according to their thickness. Different component thicknesses require different bridge widths and bridge guide radius. Figure 2 As shown, taking a 12mm thick part as an example, its bridge width is set to 4mm and the guide circle radius is 4mm. The bridge is set with an interlacing value of amm, as shown. Figure 3 The cutting path of the cutting machine is as follows: Figure 4 The cutting path is a continuous sequence from red to green.
[0053] After the cutting head of the cutting machine completes the bridge-crossing process between the parts ( Figure 4 (The middle green line has also been cut). After the bridge, which has undergone staggered guide round treatment, was cut, the parts were basically separated from each other, and the original bridge positions of the parts were not damaged, ensuring the accuracy of the parts. See Figure 5-6 Experimental tests.
[0054] The key features of this invention are that it can melt the bridge without cutting the parts, and that it adapts the plate thickness to the width, guide circle, and stagger size of the bridge. It utilizes the guide circle form to introduce and exit the bridge, which is different from the right-angle introduction and exit of traditional bridges.
[0055] During the cutting process of the bridge, the bridge is directly melted and severed without the need for manual cutting, thereby improving the efficiency of parts sorting. The cutting head's trajectory is smooth and continuous, avoiding the need for re-ignition due to mid-section issues. The bridge width and cutting guide radius are adjusted according to the thickness of the parts, resulting in more precise and efficient cutting. By adapting the plate thickness to the bridge width, guide circle, and overlap, the bridge can be melted without damaging the parts. Since no separate cutting operation of the bridge is required, it is less likely to cause damage to the part's contour.
[0056] The above are preferred embodiments of the present invention. Those skilled in the art can make various modifications or improvements based on these embodiments. Without departing from the overall concept of the present invention, such modifications or improvements should fall within the scope of protection claimed by the present invention.
Claims
1. A bridge for cutting ship hull plate parts, characterized in that: Bridges between adjacent parts: The cutting machine forms a first cutting path that turns back according to the first transition arc (1), the first straight line (5), and the second transition arc (2); The cutting machine forms a second cutting path that turns back according to the third transition arc (3), the second straight line (6), and the fourth transition arc (4); The first cutting path intersects with the second cutting path to remove a type of elliptical excess material.
2. The hull plate cutting bridge as described in claim 1, characterized in that: The first transition arc (1) and the third transition arc (3) are 90° arcs, and the first straight line (5) and the second straight line (6) are of equal length.
3. The hull plate cutting bridge as described in claim 2, characterized in that: The second transition arc (2) and the fourth transition arc (4) are also 90° arcs, at which point the edges of adjacent parts are parallel to each other.
4. The hull plate cutting bridge as described in claim 3, characterized in that: The first transition arc (1), the second transition arc (2), the third transition arc (3), and the fourth transition arc (4) have the same arc length and their radii are the guide circle radii.
5. The hull plate cutting bridge as described in claim 4, characterized in that: The distance between the first straight line (5) and the second straight line (6) is equal to the radius of the guide circle.
6. The hull plate cutting bridge as described in claim 4, characterized in that: The radius of the guide circle has a fixed ratio to the thickness of the plate material of the part.
7. A cutting method for cutting bridges of ship hull plate parts as described in any one of claims 1-6, characterized in that: When a cutting machine cuts a bridge between adjacent parts, it includes the following steps: S1. A first cutting path is formed by following the first transition arc (1), the first straight line (5), and the second transition arc (2); S2. Form the second cutting path by following the third transition arc (3), the second straight line (6), and the fourth transition arc (4); The first cutting path intersects with the second cutting path to remove a type of elliptical excess material.
8. The cutting method for cutting bridges of ship hull plate parts as described in claim 7, characterized in that: The guide radii of the first transition arc (1), the second transition arc (2), the third transition arc (3), and the fourth transition arc (4) are equal, and the guide radius and the thickness of the part plate are kept in a fixed ratio.
9. The cutting method for cutting bridges of hull plate parts as described in claim 7, characterized in that: It also includes step S3: removing the protrusions left at the edge of the part due to the removal of the excess material.