A method for heat-bending outer T-shaped profiles

Abstract

This invention discloses a method for heat-bending an outer T-shaped profile. The method includes: preparing and cutting the required web and top plates of the T-shaped profile; vertically welding and assembling the web and top plates on a continuous welding line; calculating the heating interval, heating time, and heating temperature according to set values; marking heating lines on the web and top plates, with each heating interval corresponding to one heating line on the web and one on the top plate, and the heating lines on the web and top plates forming a pair; fixing the T-shaped profile at both ends with L-shaped fixtures; and performing heat-bending according to the set heating lines, starting from one end of the T-shaped profile and proceeding along each pair of heating lines to the other end, following the order of web first, then top plate; measuring the angle at both ends of the heated T-shaped profile with an angle gauge; and calculating and adjusting the heat-bending process. This invention offers accurate positioning, high efficiency, and material savings.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, specifically to a method for heat-bending T-shaped outer plates. Background Technology

[0002] Because of the linearity of the hull plating, i.e., small-amplitude angle changes, the straight T-shaped profiles that serve as keel on the hull plating cannot be assembled at the same angle. This is generally solved by designing a variable structure within the angle change area. The variable structure is assembled by butt welding three T-shaped profiles. This is equivalent to cutting a keel twice at an angle in the change area, and then deforming the middle section of the cut keel at an angle so that it can be re-welded to the keels on both sides to form a certain angle change. In addition, anti-steering elbows are added and flat steel is added at the corners to compensate for the lack of hull strength.

[0003] This method requires three-dimensional modeling of the three keel bars, drawing production, group assembly, and a large amount of manual welding work in production. Furthermore, due to the linear shape of the outer panel, it is impossible to accurately align the keel bars during assembly, requiring a lot of fire-resistant positioning adjustments, making the assembly very difficult. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a fire-bending method for outer T-shaped profiles that features high design efficiency, high steel utilization efficiency, minimal welding workload, and accurate positioning and docking.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a method for fire-bending an outer T-shaped profile, comprising the following steps:

[0006] S1: Combined with the T-profile production line equipment, the web and face plates required for the T-profile are prepared and cut into materials;

[0007] S2: The obtained web plate and top plate are vertically welded and assembled in the keel assembly line area using a welding platform or welding vehicle.

[0008] S3: Calculate the heating interval, heating time and heating temperature according to the set values, and mark the heating interval lines on the web plate and the panel plate. Each heating interval corresponds to one heating interval line on the web plate and one heating interval line on the panel plate, and the heating interval lines on the web plate and the panel plate are paired up one by one.

[0009] S4: Set up two L-shaped fixing fixtures in the field. The short side of the fixing fixture is perpendicular to the ground and the long side is parallel to the ground. The two L-shaped fixing fixtures are symmetrically arranged and the distance between them is the same as the length of the T-shaped material. Place the T-shaped material at an angle, with one end of the panel on the ground and the other end of the panel abutting against the lower end face of the fixing fixture. Push the T-shaped material horizontally towards the short side of the fixing fixture until the web abuts against the end of the long side. Push the pad wood inward in the space formed by the T-shaped material and the bottom surface until the side longitudinal plate seam of the pad wood is locked with the web, thereby fixing the T-shaped material.

[0010] S5: Perform the fire-twisting operation according to the set heating baffles, starting from the end of the T-profile, following the order of web plate first and then panel plate, proceeding along each pair of heating baffles to the end.

[0011] S6: Measure the angles at both ends of the heated T-profile using an angle gauge, calculate the difference to see if it meets the processing requirements, and adjust any non-compliance using flame finishing. Due to the flame finishing process, precision compensation is required to ensure dimensional accuracy. When the T-profile's twist is ≤2° / m, flame shrinkage compensation is required, calculated as (total twist * 0.92 * 0.133) / total length = shrinkage compensation S mm / m, with an additional 2 mm processing compensation allowance at the ends of the web and face plates (this allowance can be omitted if the flame finishing process requires high precision). When the T-profile's twist is between 2° / m and 4° / m, flame shrinkage compensation is required, calculated as (total twist * 0.92 * 0.133) / total length = shrinkage compensation S mm / m, with an additional 3 mm processing compensation allowance at the ends of the web and face plates (this allowance can be omitted if the flame finishing process requires high precision). When the length is ≤4 meters, no shrinkage compensation is required, only a 3 mm processing compensation allowance is added.

[0012] Preferably, the heating baffle line is inclined at an angle of 45° relative to the side longitudinal plate seam of the pad. In the experience of flameworking, when the inclination angle is greater than 45°, the deformation of the web after flameworking is large and easily exceeds the processing degree requirements. When the inclination angle is less than 45°, the deformation produced by flameworking is too small, resulting in too long a flameworking time.

[0013] Preferably, the heating baffles are a plurality of parallel lines spaced at equal intervals, the vertical distance between the parallel lines being the heating baffle spacing, and the vertical distance from the upper and lower ends of the heating baffles to the edge of the panel / web plate being 100 mm. The equal intervals between the heating baffles ensure uniform temperature changes during heating.

[0014] Preferably, the heating interval is determined according to the required degree of torsion of the T-section, with the torsion set at 1° / interval, and the heating interval controlled between 200 and 400 mm. When the heating interval is less than 200 mm, the number of heating intervals required for flame working increases, and the magnitude of thermal expansion and contraction of the steel plate after flame working becomes larger. When the heating interval is greater than 400 mm, the flame working becomes more difficult, takes longer, and the deformation is harder to control.

[0015] Preferably, the heating time and temperature are 400°C, and the heating time is 2 minutes per setting. During flame heating, when the temperature reaches 400°C and heating for 1-2 minutes, the steel plate will deform. Since the keel of conventionally designed steel is generally 10-20mm thick, the temperature and time requirements are based on conventional plates.

[0016] Compared with existing technologies, this invention has the following advantages: It reduces the design modeling and drawing process from three reinforcing bars to one, thus reducing production design modeling and drawing time and improving design efficiency; it changes the utilization rate of irregular T-section web plates from 80%-90% to 100% utilization of straight web steel, reducing production costs; it transforms the manual welding of the T-section web plates and panels into machine welding, resulting in higher welding quality and improved work efficiency; it eliminates the need for reinforced welding at angled joints, reinforced welding of anti-tilting elbow plates, and welding of butt joints, significantly reducing welding workload; and it transforms the workstation from small-group part cutting to a dedicated material preparation line for reinforcing bars, reducing part assembly time and accelerating process flow. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure for fixing the T-shaped profile in this invention.

[0018] Figure 2 This is a schematic diagram of the heating baffle line in this invention.

[0019] Among them, 1-T profile, 11-web plate, 12-panel, 2-staple, 3-fixing fixture, 4-heating baffle. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading this invention, any modifications of the invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0021] like Figures 1 to 2 The heat-bending method for the outer T-shaped profile shown includes the following steps:

[0022] S1: Combine the T-profile 1 production line equipment to prepare and cut the web 11 and face 12 required for T-profile 1;

[0023] S2: The obtained web plate 11 and top plate are vertically welded and assembled in the keel assembly line area using a welding platform or welding vehicle.

[0024] S3: Calculate the heating interval, heating time and heating temperature according to the set values, and mark the heating interval lines 4 on the web plate 11 and the panel 12. Each heating interval corresponds to a heating interval line 4 on the web plate 11 and a heating interval line 4 on the panel 12, and the positions of the heating interval lines 4 on the web plate 11 and the panel 12 are paired one by one.

[0025] S4: Two L-shaped fixing fixtures 3 are set up in the field. The short side of the fixing fixture 3 is perpendicular to the ground and the long side of the fixing fixture 3 is parallel to the ground. The two L-shaped fixing fixtures 3 are symmetrically arranged and the distance between them is the same as the length of the T-shaped material 1. The T-shaped material 1 is placed at an angle, with one end of the panel 12 touching the ground and the other end of the panel 12 abutting against the lower end face of the edge of the fixing fixture 3. The T-shaped material 1 is pushed horizontally towards the short side of the fixing fixture 3 until the web plate 11 abuts against the end of the long side. The pad 2 is pushed inward into the space formed by the T-shaped material 1 and the bottom surface until the side longitudinal plate seam of the pad 2 is locked with the web plate 11, thereby fixing the T-shaped material 1.

[0026] S5: Perform the fire-twisting operation according to the set heating baffle 4, starting from the end of the T-profile 1, following the order of web plate 11 first and then panel plate 12, proceeding along each pair of heating baffles 4 to the end.

[0027] S6: Measure the angle at both ends of the heated T-profile 1 with an angle gauge, check whether the difference meets the processing requirements, and make fire adjustment for any areas that do not meet the requirements.

[0028] Furthermore, the heating baffle 4 is inclined at an angle relative to the side longitudinal plate seam of the pad 2, with the included angle set at 45°.

[0029] Furthermore, the heating baffle line 4 consists of several parallel lines spaced at equal intervals. The vertical distance between the parallel lines is the heating baffle distance. The vertical distance between the upper and lower ends of the heating baffle line 4 and the edge of the panel 12 / body 11 is 100 mm.

[0030] Furthermore, the heating interval is determined based on the required twist degree of the T-profile 1, with the twist degree set at 1° / interval and the heating interval controlled between 200 and 400 mm. This heating interval is determined by the designed twist degree. For example, a 6m keel requiring a 20° twist can be heated using a 300 mm heating interval; a 4m keel requiring a 20° twist can be heated using a 200 mm heating interval; and an 8m keel requiring a 20° twist can be heated using a 400 mm heating interval.

[0031] Furthermore, the heating time and temperature are 400°C, and the heating time is 2 minutes per setting.

[0032] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for thermoforming bending of an outer plate T-shaped section, characterized in that, It includes the following steps: S1: Combine with the T-shaped profile production line equipment to allocate materials and cut the web and panel required for the T-shaped profile; S2: Use a welding platform or a welding vehicle to vertically weld and assemble the obtained web and top plate at the site of the longitudinal rib production line; S3: Calculate the heating pitch, heating time and heating temperature according to the set value, mark the heating pitch lines on the web and the panel. Each heating pitch corresponds to a heating pitch line on the web and a heating pitch line on the panel respectively, and the positions of the heating pitch lines on the web and the panel correspond one by one to form a pair; S4: Set two L-shaped fixing tools in the site. The short side of the fixing tool is perpendicular to the ground, and the long side of the fixing tool is parallel to the ground. The two L-shaped fixing tools are axially symmetrically arranged and the distance between them is the same as the length of the T-shaped profile. Place the T-shaped profile obliquely, with one end of the panel on the ground and the other end of the panel抵触with the lower end face of the field edge of the fixing tool. Push the T-shaped profile horizontally towards the short side of the fixing tool until the web抵触with the end of the long side. Push a packing block into the space formed between the T-shaped profile and the bottom surface until the side longitudinal plate seam of the packing block jams with the web to fix the T-shaped profile; S5: Carry out the thermal processing distortion operation according to the set heating pitch lines. Starting from the end of the T-shaped profile, follow the order of the web first and then the panel, and proceed along each pair of heating pitch lines to the end; S6: Measure the angle of both ends of the heated T-shaped profile with an angle gauge, calculate whether the difference meets the processing requirements, and perform thermal processing adjustment on the places that do not meet the requirements; 2. The method for thermoforming and bending of the outer plate T-shaped profile according to claim 1, characterized in that: The heating pitch line has an inclined angle relative to the side longitudinal plate seam of the packing block, and the included angle is 45°; 3. A thermal forming bending method for an outer plate T-shaped profile according to claim 2, characterized in that: The heating pitch lines are several parallel lines with equal intervals. The vertical distance between the parallel lines is the heating pitch, and the vertical distance between the upper and lower ends of the heating pitch line and the edge of the panel / web is 100 mm; 4. A thermoforming bending method for an outer plate T-shaped profile according to claim 3, characterized in that: The heating pitch is determined according to the required distortion degree of the T-shaped profile. The heating distortion degree is set to 1° / pitch, and the heating pitch is controlled within 200 - 400 mm; 5. A thermoforming bending method for an outer plate T-shaped profile according to claim 1, characterized in that: The heating temperature is 400°C, and the heating time is 2 minutes / pitch.

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