Machining method for special-shaped arc structure

Abstract

The invention discloses a special-shaped arc structure machining method. The special-shaped arc structure machining method comprises the following steps that a pre-cut plane special-shaped plate is provided; the long edge and the short edge of the plane special-shaped plate are bent in a stepping mode; and the spliced positions of the long edges and the short edges after bending are welded, so that a finished product of the special-shaped arc structure is obtained. Compared with the prior art, an integral forming die does not need to be independently configured according to different special-shaped contours and curvatures, and the long edges and the short edges of the plane special-shaped plate are sequentially subjected to segmented forming through the universal bending machining mechanism in a stepping bending mode, so that the arc shape is gradually formed through multiple times of bending, and the machining efficiency is improved. Therefore, different non-standard contours and different curvature requirements can be flexibly adapted; according to the method, mold dependence and manufacturing cost are remarkably reduced, process universality and production flexibility are improved, and the method is suitable for machining of multi-variety, small-batch and customized special-shaped arc pieces.

Description

Technical Field

[0001] This application relates to the field of irregular circular arc processing technology, and in particular to a method for processing irregular circular arc structures. Background Technology

[0002] In the field of sheet metal processing, there has always been a technological challenge in forming non-standard profile sheet metal parts (i.e., non-standard profile sheet metal other than rectangles and circles) into arcs. Traditional methods mainly rely on integral stamping dies, which require the design and manufacture of special dies for each specific profile and curvature. However, the dies cannot be reused. Therefore, in order to make different arc shapes, different dies need to be configured separately, resulting in extremely poor flexibility and difficulty in adapting to the needs of customized production of batches and multiple varieties.

[0003] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a method for processing irregular arc structures, which addresses the above-mentioned deficiencies of the prior art and aims to solve the problem that the prior art requires the use of molds for the arc forming processing of irregular sheet metal parts.

[0005] The technical solution adopted by this application to solve the technical problem is as follows: A method for processing irregularly shaped circular arc structures includes the following steps: Provide a pre-cut flat irregular-shaped sheet material; Step-by-step bending is performed on the long and short sides of the planar irregular-shaped sheet material; Weld the joints of the long and short sides after bending to obtain the finished irregular arc structure.

[0006] The method for processing irregular arc structures, wherein the step-by-step bending of the long and short sides of the planar irregular plate material specifically includes: Based on the inner diameter and bending angle of the arc corresponding to the finished irregular arc structure, calculate the arc length of the long side arc and the arc length of the short side arc respectively. The number of step bends on the long side is calculated based on the arc length of the long side and the preset long side bending step distance. The number of short-side step bends is calculated based on the arc length of the short-side arc and the preset short-side bending step distance. A bending processing mechanism is used to perform step bending on the long side of the planar irregular-shaped plate according to the preset long side bending step distance and the preset number of long side step bending, and to perform step bending on the short side of the planar irregular-shaped plate according to the preset short side bending step distance and the preset number of short side step bending.

[0007] The method for processing irregular arc structures, wherein the formula for calculating the arc length is: ; in, For the arc length, Where K is the inner diameter of the arc, K is the sheet metal coefficient, and T is the sheet metal thickness. This refers to the bending angle.

[0008] The method for processing irregular arc structures, wherein the step of calculating the arc length of the long side and the arc length of the short side based on the inner diameter and bending angle of the arc corresponding to the finished irregular arc structure specifically includes: Calculate the arc length of the long side circular arc based on the formula for calculating the arc length, the inner diameter of the long side circular arc, and the bending angle of the long side. The arc length of the short side is calculated based on the formula for calculating the arc length, the inner diameter of the short side arc, and the bending angle of the short side.

[0009] The method for processing irregular arc structures, wherein calculating the number of step bends on the long side based on the arc length of the long side and a preset bending step distance on the long side specifically involves: Divide the arc length of the long side by the preset long side bending step distance to obtain the number of long side step bending times.

[0010] The method for processing irregular arc structures, wherein the bending processing mechanism includes: A bending die; the bending die has an upper die and a lower die, the lower die being used to support planar irregularly shaped sheet metal; The post-fixing gauge is located on one side of the upper and lower bending dies and is used to position the planar irregular-shaped sheet metal. The method for processing irregular arc structures, wherein the use of a bending processing mechanism to perform step bending on the long side of the planar irregular plate according to the preset long side bending step distance and the number of long side step bending times, specifically includes: The position of the first bending line on the long side of the planar irregular-shaped plate to be bent is determined according to the preset long side bending step distance; The long side of the flat irregular plate that needs to be bent is positioned corresponding to the upper and lower bending dies, and the other long side is positioned by the lower dies, so that the position of the first bending line corresponds to the upper die. Control the upper mold to press down vertically, and make the first bending line reach the pre-bending angle; The planar irregular plate is controlled by the post-calibration control to move along the width direction according to the preset long side bending step distance and perform step bending until the number of bending times reaches the number of long side step bending times.

[0011] The method for processing irregular arc structures, wherein the step of performing step bending on the short side of the planar irregular plate according to the preset short side bending step distance and the number of short side step bending times specifically includes: The position of the first bending line on the short side of the planar irregular-shaped plate to be bent is determined according to the preset short side bending step distance; The short side of the flat irregular plate that needs to be bent is positioned corresponding to the upper and lower bending dies, and the other short side is positioned by the lower dies, so that the position of the first bending line corresponds to the upper die. Control the upper die to press down vertically, and make the first bending line reach the pre-bending angle; The planar irregular plate is controlled by the post-calibration control to move along the length direction according to the preset short side bending step distance and perform step bending until the number of bending times reaches the number of short side step bending times.

[0012] In the aforementioned method for processing irregular arc structures, both the preset long side bending step distance and the preset short side bending step distance are 8.8 mm.

[0013] Beneficial effects: This application eliminates the need for separate integral forming molds for different irregular contours and curvatures. Instead, it uses a step-bending method and a universal bending processing mechanism to sequentially form the long and short sides of the planar irregular sheet material in segments, so that the arc shape is gradually formed by multiple bends. This allows for flexible adaptation to different non-standard contours and curvature requirements. This method significantly reduces mold dependence and manufacturing costs, improves process versatility and production flexibility, and is suitable for processing irregular arc parts of various varieties, small batches, and customization. Attached Figure Description

[0014] Figure 1 This is a flowchart of the processing method for the irregular circular arc structure in this application; Figure 2 This is a structural schematic diagram of the planar irregular-shaped plate in this application; Figure 3 This is a reference diagram showing the usage state of the planar irregular-shaped sheet material after both long sides are bent in a step-by-step manner in this application; Figure 4 This is a reference diagram showing the usage state of the planar irregular-shaped sheet material after both long and short sides of the sheet are bent in a step-by-step manner. Figure 5 This is a structural diagram of the finished product with an irregularly shaped circular arc structure; Figure 6 This is a schematic diagram of the bending processing mechanism in this application. Detailed Implementation

[0015] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description of this application is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0016] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0017] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0018] This application provides a method for processing irregularly shaped circular arc structures, such as... Figure 1 As shown, the processing method for irregular circular arc structures includes the following steps: S100, Provide a pre-cut flat irregular-shaped sheet material; Specifically, such as Figure 2 As shown, the outline of the planar irregular-shaped sheet 100 is a two-dimensional planar unfolded shape obtained by geometric unfolding based on the final required three-dimensional irregular arc structure. Based on this two-dimensional planar unfolded shape, a planar sheet is pre-cut using CNC laser cutting or other cutting equipment to obtain the planar irregular-shaped sheet 100, thus providing a workable physical carrier for subsequent step-by-step bending and splicing. For example... Figure 2 As shown, the middle part of the long side 101 protrudes relatively from the edge of the short side 102, making the planar irregular plate 100 neither rectangular nor circular, but a non-standard profile.

[0019] The planar irregular plate 100 is a planar irregular sheet metal plate; the thickness of the planar irregular plate 100 is 1.5mm, the bending force required is moderate, the bending process is well controllable, and the springback is relatively stable, thus ensuring the curvature consistency and accuracy of each arc segment produced by step bending, which is a prerequisite for achieving high-quality splicing and welding in the future.

[0020] S200, Perform step bending on the long and short sides of the flat irregular-shaped sheet material respectively; Specifically, the outline of the planar irregular plate 100 is divided into a long side 101 and a short side 102; where the long side 101 is a line segment with a longer length and the short side 102 is a line segment with a shorter length, so as to adapt to the subsequent step-by-step bending strategy through the long side 101 and the short side 102.

[0021] First, along one long side, the planar irregularly shaped sheet material 100 is positioned according to requirements. Then, a bending processing mechanism is used to perform a downward bend at the first bending line position. Next, the planar irregularly shaped sheet material 100 is moved so that the adjacent area corresponds to the second bending line position and a second downward bend is performed. Using a stepping method, through multiple and continuous local bends, the entire long side of one side is eventually formed into a continuous arc. Similarly, the bending processing mechanism is used to sequentially perform multiple and continuous local bends on the other long side and both short sides 102 using a stepping method.

[0022] By adjusting the pressure, depth, and step spacing of the bending mechanism, slightly varying arc curvatures can be formed on different sides, segments, and even at different locations along the same long side. This adapts to the multi-curvature transitions required in the design, something that existing rigid integral molds cannot achieve. It is evident that by decomposing the contour of planar irregularly shaped plates 100% and employing a step-bending strategy, the complex three-dimensional forming function undertaken by a dedicated integral mold can be deconstructed into a series of standardized two-dimensional local forming operations executed by the bending mechanism. This enables the processing of arc structures and even allows for the processing of arc structures with different curvatures at different locations on the same structural component.

[0023] S300. Weld the joints of the long and short sides after bending to obtain the finished product of the irregular arc structure.

[0024] Specifically, after sequentially bending the two long sides 101 and the two short sides 102, as follows: Figure 4 As shown, the original planar irregular plate 100 is transformed into a three-dimensional prototype with upward arc flanges on each side; at this time, the intersection of the endpoints of each arc edge is the splicing point (for example, there is a splicing point between the left end of the long side arc and the adjacent short side arc, and there is a splicing point between the right end of the long side arc and the adjacent short side arc; both long sides 101 and both short sides 102 of the planar irregular plate 100 are subjected to step bending, so after the step bending step is completed, there are a total of four splicing points).

[0025] Welding processes such as laser welding or argon arc welding are used to weld along the seams at each joint, and the surface is then ground. Figure 5 As shown, the final product structure with the desired irregular arc structure can be obtained.

[0026] Therefore, this application breaks down the overall mold forming process in the prior art into three independent processes: first, cutting to obtain a planar irregular plate 100; then, using a bending processing mechanism to perform step bending on the contour lines (long and short sides) of the planar irregular plate 100; and finally, integrating the segments through welding to form the final structure. This allows the same set of cutting, step bending, and welding processes to cope with ever-changing irregular contours and multiple curvature requirements, completely eliminating the rigid constraint of "one mold for one use" and replacing the traditional model of "dedicated mold + customized forming". This not only significantly reduces the mold cost and preparation time of individual parts, but more importantly, it gives the production line a high degree of flexibility to quickly respond to different design requirements, improves flexibility, and is more adaptable to the customized production needs of batch and multi-variety production.

[0027] In one embodiment of this application, the step bending of the long and short sides of the planar irregularly shaped sheet material specifically includes: S201. Calculate the arc length of the long side and the arc length of the short side based on the inner diameter and bending angle of the arc corresponding to the finished irregular arc structure. Specifically, the formula for calculating the arc length of a circular arc is: ; in, For the arc length, Where K is the inner diameter of the arc, K is the sheet metal coefficient, and T is the sheet metal thickness. For the bending angle, R, K, T and Since all the information is known, the arc length can be calculated using this formula.

[0028] The calculation of the arc length of the long side and the arc length of the short side based on the inner diameter and bending angle of the corresponding arc in the finished irregular arc structure includes: Calculate the arc length of the long side circular arc based on the formula for calculating the arc length, the inner diameter of the long side circular arc, and the bending angle of the long side. The arc length of the short side is calculated based on the formula for calculating the arc length, the inner diameter of the short side arc, and the bending angle of the short side.

[0029] Specifically, in the formula for calculating the arc length of the longer side, the inner diameter R of the arc is the inner diameter of the arc on the longer side. Given the bending angle of the long side, after obtaining the inner diameter of the long side arc and the bending angle, the arc length of the long side arc can be calculated using the formula above. Similarly, for the short side, in the formula for calculating the arc length, the inner diameter R of the arc is the inner diameter of the short side arc. If the short side bend angle is given, then after obtaining the inner diameter of the short side arc and the short side bend angle, the arc length of the short side arc can be calculated according to the above calculation formula.

[0030] In one embodiment of this example, the inner diameter of the long side arc is equal to the inner diameter of the short side arc, both being 48.5mm; the outer diameter of the long side arc is equal to the outer diameter of the short side arc, both being 50mm; the bending angle of the long side is equal to the bending angle of the short side, both being 90°; the board material coefficient K is 0.5, and the board material thickness T is 1.5mm; therefore, the arc length of the long side arc is equal to the arc length of the short side arc, both being 77.32mm.

[0031] S202. Calculate the number of long-side step bends based on the arc length of the long-side arc and the preset long-side bending step distance. Specifically, the bending step distance is the center-to-center distance between two adjacent bending positions. Since the long side and short side can adopt different stepping strategies according to actual needs, it is necessary to preset the bending step distance for the long side and the bending step distance for the short side respectively. The preset bending step distance for the long side is the center-to-center distance between two adjacent bending positions when performing a stepping bend on the long side; the preset bending step distance for the short side is the center-to-center distance between two adjacent bending positions when performing a stepping bend on the short side.

[0032] The calculation of the number of step bends on the long side based on the arc length of the long side and the preset long side bend step distance is as follows: Divide the arc length of the long side by the preset long side bending step distance to obtain the number of long side step bending times.

[0033] Specifically, the number of bends on the long side = arc length of the long side / preset bend step distance on the long side; this calculation result is usually not an integer, so in actual operation, the rounding method is used.

[0034] The smaller the bending step distance, the rounder the arc obtained after bending. In one embodiment of this example, the preset bending step distance for the long side is 8.8mm. For a 1.5mm thick planar irregularly shaped sheet, the springback after bending is easy to control, and the number of bends is within a reasonable range. This approach can approximate the theoretical arc with sufficient bending points while avoiding unnecessary redundant operations. This results in a more accurate and consistent macroscopic arc radius formed by multiple bends, making it particularly suitable for situations with a certain production volume.

[0035] Therefore, when the arc length of the long side is 77.32mm, the calculated number of step bends on the long side is 8.786. Using the rounding up method, the number of step bends on the long side is 9, that is, for each long side, it needs to go through 9 bends, and the position of each bend is not repeated.

[0036] S203. Calculate the number of short-side step bends based on the arc length of the short-side arc and the preset short-side bending step distance. The calculation of the number of short-side step bends based on the arc length of the short-side arc and the preset long-side bend step distance is specifically as follows: Divide the arc length of the short side by the preset bending step distance of the long side to obtain the number of short side step bends.

[0037] In one embodiment of this example, the preset short side bending step distance is 8.8mm. When the arc length of the short side is 77.32mm, the calculated number of short side step bending times is 8.786. Using the rounding up method, the number of short side step bending times is 9. That is, for each short side, it needs to go through 9 bends, and the position of each bend is not repeated.

[0038] S204. Using a bending processing mechanism, the long side of the planar irregular-shaped plate is bent in a step-by-step manner according to the preset long side bending step distance and the preset long side step-by-step bending number, and the short side of the planar irregular-shaped plate is bent in a step-by-step manner according to the preset short side bending step distance and the preset short side step-by-step bending number.

[0039] Specifically, after calculating the parameters required for the long side bending operation (bending step distance and number of bending steps) and the parameters required for the short side bending operation (bending step distance and number of bending steps) according to the aforementioned steps, step bending processing is performed on both long sides and both short sides based on these parameters. When switching products, it is only necessary to calculate the corresponding parameters and execute the corresponding step bending steps based on the corresponding parameters, without the need to design, manufacture, and install a corresponding integral forming mold for different irregular contour products.

[0040] One embodiment of this application, such as Figure 6 As shown, the bending processing mechanism 200 includes upper and lower bending dies 201 and a rear guide 202; the upper and lower bending dies 201 have an upper die 2011 and a lower die 2012, the lower die 2012 is used to support the planar irregular plate 100; the rear guide 202 is located on one side of the upper and lower bending dies 201 and is used to position the planar irregular plate 100.

[0041] Specifically, the upper and lower bending dies 201 include an upper die 2011 and a lower die 2012 arranged opposite to each other; the lower die 2012 is fixedly arranged and is used to carry and support the planar irregular plate 100; the upper die 2011 is located above the lower die 2012 and can move up and down in the vertical direction to apply bending pressure to the planar irregular plate 100, thereby forming bending deformation at the corresponding position of the planar irregular plate 100. Through the cooperation between the upper die 2011 and the lower die 2012, the planar irregular plate 100 can be partially bent and formed, meeting the needs of step bending processing.

[0042] The rear guide gauge 202 is located on one side of the upper and lower bending dies 201 and is used to position the planar irregular plate 100 during the bending process. Before each bend, the edge of the unbent side of the planar irregular plate 100 abuts against the rear guide gauge 202. The rear guide gauge 202 provides a reference for positioning the planar irregular plate 100 in the horizontal direction, thereby ensuring that the planar irregular plate 100 can move step by step according to a preset distance during multiple bends. For example, when it is necessary to bend the left long side of the planar irregular plate 100, the rear guide gauge 202 abuts against the right long side edge of the planar irregular plate 100 that does not currently need to be bent, thereby positioning the planar irregular plate 100 in the horizontal direction and ensuring that the vertical downward pressing position of the upper die 2011 corresponds perfectly to the bending position on the planar irregular plate 100.

[0043] During the step bending process, the upper and lower bending dies 201 are responsible for providing the bending and forming function, while the post-alignment dies 202 are responsible for providing the repeating positioning reference. The two work together to enable the planar irregular plate 100 to gradually form the target arc contour through multiple continuous bending without changing the overall die, thereby improving the adaptability to irregular contours and the processing accuracy.

[0044] In one embodiment of this example, the upper mold 2011 is a straight-pointed knife with an angle of 835mm*88°, and the lower mold 2012 is a V-shaped lower mold with a V-groove; the effective working length of the lower mold 2012 is 835mm, the mold height of the lower mold 2012 is 40mm, and the opening width of the V-groove is 10mm.

[0045] It is understood that both the upper and lower bending dies 201 and the post-fixing dies 202 are existing technologies, and the specific structures of the two will not be described in detail in this application.

[0046] In one embodiment of this application, the bending processing mechanism performs step bending on the long side of a planar irregularly shaped sheet metal according to the preset long side bending step distance and the number of long side step bending times, specifically including: The position of the first bending line on the long side of the planar irregular-shaped plate to be bent is determined according to the preset long side bending step distance; Specifically, in this application, before performing the step bending, it is necessary to first determine the spatial reference of the first bending position on the planar irregular-shaped sheet 100. Since the irregular arc corresponding to the long side is gradually approached by multiple consecutive bends, each bend will form a corresponding bending line on the planar irregular-shaped sheet 100. Therefore, it is necessary to divide the area to be bent on the long side according to the preset long side bending step distance, so as to determine the specific position of the first bending line in the long side direction.

[0047] Position the long side of the flat irregular plate that needs to be bent in accordance with the upper and lower bending dies, and position the other long side by the lower dies so that the position of the first bending line corresponds to the upper die. Specifically, before bending, the long side that needs to be bent stepwise is placed within the functional area of ​​the upper and lower bending dies 201, so that it forms a bending corresponding position with the upper die 2011 and the lower die 2012; at the same time, the other long side that does not need to be bent is abutted against the rear guide 202, which laterally positions the planar irregular plate 100. Through the cooperation of the upper and lower bending dies 201 and the rear guide 202, it can be ensured that the first bending line is accurately located in the functional position of the upper die 2011 before bending.

[0048] Control the upper mold to press down vertically, and make the first bending line reach the pre-bending angle; Specifically, the upper die 2011 is driven to press down vertically, causing the planar irregularly shaped sheet 100 to undergo localized plastic deformation between the upper die 2011 and the lower die 2012, thereby forming a pre-bending angle at the first bending line position. This pre-bending angle is not the final arc angle, but is used to gradually accumulate and form the target arc contour through subsequent multiple step bends. By pre-controlling the bending angle, the springback and forming deviation caused by a single bend can be reduced, and the overall stability of the arc processing can be improved.

[0049] The planar irregular plate is controlled by the post-calibration control to move along the width direction according to the preset long side bending step distance and perform step bending until the number of bending times reaches the number of long side step bending times.

[0050] Specifically, after completing the first bending line, the post-alignment guide 202 guides the planar irregular plate 100 to move along the width direction by a preset bending step distance, so that the next bending position enters the functional area of ​​the upper and lower bending dies 201. The bending operation is then repeated to successively form multiple mutually spaced bending lines (the distance between two adjacent bending lines is equal to the preset bending step distance). By controlling the movement step distance and the number of bends, multiple bends are sequentially unfolded along the long side, thereby gradually processing the original planar long side into a continuous arc shape until the step-by-step bending of the entire long side is completed.

[0051] Following the above processing method, after performing a step-bending bend on one long side, a step-bending bend can be performed on the other long side. Thus, both long sides of the planar irregular-shaped sheet 100 can be bent multiple times sequentially according to a preset bending step distance and the number of step-bending bends on the long side, under a unified positioning reference. Figure 3 As shown, the two long sides of the planar irregular-shaped plate 100 gradually transition from a planar shape to the target arc shape.

[0052] When performing step bending on the long side, the pre-bending angle = bending angle / number of step bending on the long side. In one embodiment of this example, the bending angle of the long side is 90° and the number of step bending on the long side is 9 times. Therefore, the pre-bending angle corresponding to the step bending on the long side is 10°.

[0053] It should be noted that during the step bending of the planar irregular-shaped sheet 100, each bending line is not formed under the same initial stress state. As the step bending progresses, the area that has been bent gradually increases, and the overall stiffness, stress distribution, and contact state between the planar irregular-shaped sheet 100 and the upper and lower bending dies 201 all change. Compared to the previous bend, the subsequent bending position is constrained by the already bent area, and its forming resistance will change. Based on the above, when performing the next bend, the downward pressure of the upper die 2011 in the upper and lower bending dies 201 needs to be adjusted so that the current bending position can achieve the expected bending angle and forming effect. By adjusting the bending pressure step by step, the bending consistency of each step bending line can be ensured, avoiding problems such as bending angle deviation or discontinuity in arc forming caused by changes in sheet stress.

[0054] When performing multiple step bends on the same long side, the overall rigidity and springback tendency of the sheet material gradually increase as the number of bent lines increases. Therefore, the bending pressure of subsequent bends needs to be gradually increased compared to the previous bend to ensure that each bend reaches the preset pre-bending angle. When the step bend on one long side is completed and the process switches to the other long side for step bend, the downward pressure of the upper and lower bending dies 201 needs to be reduced to the preset initial pressure of the long side. Similarly, as the step bend on the other long side continues, the number of bent areas gradually increases. During the processing of the second and subsequent bends on the other long side, the bending pressure is gradually increased according to the bending sequence to ensure that each bend reaches the preset pre-bending angle.

[0055] The step bending of the short side of the planar irregular-shaped sheet material according to the preset short side bending step distance and the number of short side step bending times specifically includes: The position of the first bending line on the short side of the planar irregular-shaped plate to be bent is determined according to the preset short side bending step distance; The short side of the flat irregular plate that needs to be bent is positioned corresponding to the upper and lower bending dies, and the other short side is positioned by the lower dies, so that the position of the first bending line corresponds to the upper die. Control the upper die to press down vertically, and make the first bending line reach the pre-bending angle; The planar irregular plate is controlled by the post-calibration control to move along the length direction according to the preset short side bending step distance and perform step bending until the number of bending times reaches the number of short side step bending times.

[0056] Specifically, similar to the step-bending method for the long sides, this application can sequentially complete the step-bending operation of the short sides of the planar irregular plate 100.

[0057] When performing step bending on the short side, the pre-bending angle = bending angle / number of step bending on the short side. In one embodiment of this example, the bending angle of the short side is 90° and the number of step bending on the short side is 9 times. Therefore, the pre-bending angle corresponding to the step bending on the short side is 10°.

[0058] It should be noted that in this application, the step-bending of the two long sides is completed first, and then the step-bending of the two short sides is performed. After the step-bending of the two long sides is completed, the planar irregular plate 100 has changed from a planar state to a spatial form with large curvature on the two long sides, and its overall stiffness and stress state are significantly different from the initial planar state. Therefore, when starting the bending of the short sides, the large pressure used in the last bending of the long sides cannot be used. Before switching from step-bending of the long sides to step-bending of the short sides, the downward pressure of the upper and lower bending dies 201 needs to be adjusted back to the preset initial pressure of the short sides. This preset initial pressure of the short sides is lower than the pressure used in the last bending of the long sides, and is used to adapt to the stress state when the short sides are first bent, so that the first bending line of the short sides forms a pre-bending angle under relatively mild and controllable pressure conditions, avoiding loss of forming control due to excessive pressure.

[0059] After completing the first bending line on the short side, as the short side continues to bend, the bent area gradually increases, and the constraint of the sheet metal on subsequent bending positions gradually strengthens. Therefore, during the processing of the second and subsequent bending lines on the short side, the bending pressure is gradually increased according to the bending sequence to ensure that each bending line reaches the preset pre-bending angle. When the step bending of one short side is completed and the process switches to the other short side for step bending, the downward pressure of the upper and lower bending dies 201 needs to be adjusted down to the preset initial pressure of the short side. Similarly, as the step bending of the other short side continues, the bent area gradually increases, and during the processing of the second and subsequent bending lines on the other short side, the bending pressure is gradually increased according to the bending sequence to ensure that each bending line reaches the preset pre-bending angle.

[0060] Furthermore, in this application, the long sides are bent in a step-by-step manner first, followed by the short sides. Compared to the short sides, the long sides are longer and have more bending lines, making their step-by-step bending more significant in impact on the overall shape of the sheet metal. Completing the step-by-step bending of the long sides first allows for the initial establishment of the main arc contour of the irregularly shaped sheet metal part, clarifying the overall curvature direction and deformation trend of the planar irregularly shaped sheet metal. With the main contour already formed, the short sides are then bent in a step-by-step manner. The short side bending is merely a supplementary shaping based on the existing curvature and does not significantly disturb the already formed long side arc. This processing sequence maintains a stable positioning reference for the planar irregularly shaped sheet metal during bending, facilitating precise step distance control through the post-calibration gauge 202. It also helps to establish the main arc contour of the planar irregularly shaped sheet metal first, avoiding the adverse effects of bending the short sides first on the positioning and stress state of the long side step-by-step bending, thereby improving the consistency and processing stability of the arc forming.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0066] Of course, the above description of the embodiments of the present invention is quite detailed, but it should not be construed as a limitation on the scope of protection of the present invention. The present invention may have many other implementations. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A method for processing a special-shaped circular arc structure, characterized in that, It comprises the following steps: Providing a pre-cut flat special-shaped plate; Respectively performing step-by-step bending on the long side and the short side of the flat special-shaped plate; Welding the spliced part after bending the long side and the short side to obtain a special-shaped arc structure product.

2. The method of claim 1, wherein the method further comprises: The step of respectively performing step-by-step bending on the long side and the short side of the flat special-shaped plate comprises: According to the arc inner diameter and the bending angle corresponding to the special-shaped arc structure product, respectively calculating the long side arc length and the short side arc length; According to the long side arc length and the preset long side bending step distance, calculating the long side step-by-step bending times; According to the short side arc length and the preset short side bending step distance, calculating the short side step-by-step bending times; Using a bending processing mechanism, performing step-by-step bending on the long side of the flat special-shaped plate according to the preset long side bending step distance and the long side step-by-step bending times, and performing step-by-step bending on the short side of the flat special-shaped plate according to the preset short side bending step distance and the short side step-by-step bending times.

3. The method of claim 2, wherein the method further comprises: The calculation formula of the arc length is: ； Wherein, is the arc length of the circular arc, is the inner diameter of the circular arc, K is the plate coefficient, T is the plate thickness, is the bending angle.

4. The method of claim 3, wherein the method further comprises: The step of respectively calculating the long side arc length and the short side arc length according to the arc inner diameter and the bending angle corresponding to the special-shaped arc structure product comprises: According to the calculation formula of the arc length, the long side arc inner diameter and the long side bending angle, calculating the long side arc length; According to the calculation formula of the arc length, the short side arc inner diameter and the short side bending angle, calculating the short side arc length.

5. The method of claim 2, wherein the method further comprises: The step of calculating the long side step-by-step bending times according to the long side arc length and the preset long side bending step distance comprises: Dividing the long side arc length by the preset long side bending step distance to obtain the long side step-by-step bending times.

6. The method of claim 2, wherein the method further comprises: The bending processing mechanism comprises: An up-and-down bending die, which has an upper die and a lower die, and the lower die is used for bearing the flat special-shaped plate; A rear positioning rule, which is located on one side of the up-and-down bending die and is used for positioning the flat special-shaped plate.

7. The method of claim 6, wherein the method further comprises: The step of performing step-by-step bending on the long side of the flat special-shaped plate according to the preset long side bending step distance and the long side step-by-step bending times comprises: Determining the first bending line position on the long side of the flat special-shaped plate which needs to be bent currently according to the preset long side bending step distance; Positioning the long side of the flat special-shaped plate which needs to be bent currently and the other long side by the rear positioning rule, so that the first bending line position corresponds to the upper die; Controlling the upper die to vertically press down and make the first bending line reach a preset bending angle; Controlling the flat special-shaped plate to move along the width direction according to the preset long side bending step distance by the rear positioning rule, and performing step-by-step bending until the bending times reach the long side step-by-step bending times.

8. The method of claim 6, wherein the method further comprises: The step of performing step-by-step bending on the short side of the flat special-shaped plate according to the preset short side bending step distance and the short side step-by-step bending times comprises: Determining the first bending line position on the short side of the flat special-shaped plate which needs to be bent currently according to the preset short side bending step distance; Positioning the short side of the flat special-shaped plate which needs to be bent currently and the other short side by the rear positioning rule, so that the first bending line position corresponds to the upper die; The upper die is controlled to vertically press down and make the first bending line reach a preset bending angle; The rear regulation control plane is used to control the profiled plate to move along the length direction according to the preset short-side bending step distance and perform step-by-step bending until the bending times reach the short-side step-by-step bending times.

9. The method of claim 2, wherein the method further comprises: The preset long-side bending step distance and the preset short-side bending step distance are both 8.8 mm.

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