A springback compensation process for bending a lamp hook

Abstract

The present application relates to a kind of lamp hook bending forming springback compensation process, belong to the technical field of metal component bending forming, according to the first bending of the same batch blank according to finished product contour, unload and determine springback deviation;With the first and last joint position of the inner contour of lamp hook and the design outer circumference of support tube, the continuous contour is divided into directional zone, adhering area and adjusting mouth area, first, the end of directional zone and adhering area is corrected, with the joint position and the continuous part that has met the finished product contour as the holding boundary, then, the adjacent holding boundary is reversedly corrected step by step to the maximum deviation position, finally, the adjusting mouth area is corrected separately, to form the compensation contour;According to the compensation contour, it is continuously formed after the second bending and the continuous forming after the unloading comparison is qualified.The present application can limit the transmission of local correction to the contour and opening end that has been qualified, and reduce the mutual influence of holding contour and opening position in multiple compensation.

Description

Technical Field

[0001] This invention belongs to the field of metal component bending and forming technology, specifically relating to a springback compensation process for bending and forming lamp hooks. Background Technology

[0002] Stage light hooks are used to mount stage lighting fixtures onto rigging rods or truss tubes. They typically have a connecting section for attaching to the lighting fixture, a holding section for gripping the tube, and an opening for the tube to enter. For light hooks manufactured by bending aluminum alloy blanks, existing processes usually involve an initial bending according to the finished hook contour. After the hook is unloaded and springs back, it is compared to the finished contour. If the hook contour deviates, compensation is achieved by increasing the degree of bending, adjusting the corresponding contour according to the direction of deviation, or performing a secondary bending. The compensation result is then determined by a second comparison.

[0003] However, the lamp hook forms a continuously extending curved profile from the connecting section to the opening end. The end position and extension direction of any preceding profile constitute the forming starting condition for the subsequent profile. Without limiting the boundary of the re-bending action, reverse correction of a local profile will cause changes in the position or extension direction of adjacent continuous profiles. In particular, the fitting profile of the holding section is constrained by both the initial contact position and the final contact position. When correction is performed segment by segment from one side, the positional change caused by the correction can easily be transmitted to the contact position on the other side. When there is already a continuous part in the fitting profile that matches the finished profile, subsequent correction may also transmit deformation through this continuous part, causing it to deviate from the original qualified profile, and further causing changes in the starting point and opening end of the adjustment area. Existing overall compensation, step-by-step compensation according to the deviation direction, or continuous secondary bending do not limit the correction range for the contact boundaries on both sides of the fitting profile and the already qualified profile within the area. Therefore, the holding profile and the opening position will still affect each other during multiple compensation processes. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a springback compensation process for bending and forming lamp hooks, thus solving the problems.

[0005] The objective of this invention can be achieved through the following technical solution: a springback compensation process for bending and forming a lamp hook, comprising the following steps: S1: Perform the first bending of the same batch of blanks according to the finished outline of the lamp hook, and compare the finished outline with the connecting section as the reference after unloading. S2: Determine the location and direction of the rebound deviation; S3: The position where the end of the connecting section first meets the inner contour of the lamp hook and the outer periphery of the support tube is designated as the orientation zone; the position from the first meeting point to the last meeting point is designated as the fitting zone; and the position from the last meeting point to the open end is designated as the adjustment zone. First, the orientation zone is corrected in reverse so that the first meeting point and its extension direction match the finished contour. Keeping the orientation zone unchanged, the end of the fitting zone is corrected so that its position and extension direction match the finished contour at the last meeting point. The continuous parts of the contours at the first and last meeting points and the fitting zone that already match the finished contour are used as the retaining boundaries. During correction, the position and extension direction of each retaining boundary are not changed. The correction is carried out segment by segment from the adjacent retaining boundaries to the position where the distance between them deviates the most from the finished contour, and the corrected contours on both sides are continuously connected. Keeping the orientation zone and the fitting zone unchanged, only the adjustment zone is corrected in reverse so that the open end reaches the finished position, thus obtaining the compensation contour. S4: Bend again according to the compensation contour. If there is still a deviation after unloading and comparison, repeat step S3. S5: After passing the comparison, continuously bend and shape according to the compensation contour.

[0006] As a further aspect of the present invention, in step S3, after each reverse correction of the contour is completed, the lamp hook is unloaded and the connecting segment is re-aligned with the finished contour; only the continuous part that still conforms to the finished contour after unloading is determined as the boundary to be maintained, and the part that deviates again after unloading continues to be reverse corrected.

[0007] As a further aspect of the present invention, when correcting the deviation profile between adjacent holding boundaries, the correction is performed alternately from the two holding boundaries toward the position with the largest deviation from the finished product profile; after each unloading, the newly formed continuous part that conforms to the finished product profile is incorporated into the corresponding holding boundary until the corrected profile between the two holding boundaries is continuously connected.

[0008] As a further aspect of the present invention, when correcting the end of the bonding area, the opening area is not locally bent, so that the opening area maintains its own contour and moves as a whole with the end of the bonding area; after the position and extension direction of the end of the bonding area are confirmed to match the contour of the finished product by unloading, the bonding area is kept unchanged and the opening area is corrected separately.

[0009] As a further aspect of the present invention, after the fitting area is corrected, the fitting area is fitted with the design outer periphery contour of the support tube, keeping the continuous part in the fitting area that already matches the design outer periphery contour unchanged, and the gap contour between adjacent continuous parts is corrected in reverse from both ends to the middle until the first contact position and the last contact position remain unchanged and the gap contour matches the design outer periphery contour.

[0010] As a further aspect of the present invention, after the adjustment area is corrected, the outer periphery of the support tube is moved from the outside of the opening into the fitting area along the insertion direction of the lamp hook; when the outer periphery of the design interferes with the adjustment area, the orientation area and the fitting area remain unchanged, and only the continuous part in the adjustment area where interference first occurs is reversed and the movement and correction are repeated until the outer periphery of the design can enter the fitting area through the opening.

[0011] As a further aspect of the present invention, when the same continuous deviation portion determined in step S2 crosses an adjacent functional area, the continuous deviation portion is divided into two parts to be corrected based on the first contact position or the last contact position; the part to be corrected closer to the connecting segment is corrected first, and after unloading and confirming the contact position and its extension direction, the already corrected part to be corrected remains unchanged, and then the other part to be corrected is corrected.

[0012] As a further aspect of the present invention, when step S3 is repeated in step S4, when the same contour part is located on both sides of the finished contour after two adjacent bending unloadings, the compensation contour used in the two adjacent bendings is used as the correction boundary on both sides of the contour part, a new compensation contour is formed between the two correction boundaries, and the correction range is limited to the corresponding adjacent holding boundaries.

[0013] As a further aspect of the present invention, before S5, the compensation contour zone confirmed in S4 is sampled into a continuous forming contour; wherein, the orientation zone is sampled based on the connecting section, the bonding zone is sampled from both ends to the middle based on the first contact position and the last contact position and is continuously connected, and the opening zone is sampled from the last contact position to the opening end, and the contact positions and their extension directions remain unchanged during the sampling process.

[0014] As a further aspect of the present invention, during the continuous bending forming process in step S5, the extracted forming part is unloaded and compared with the finished product contour; when the contour deviation is only located in one of the functional areas, the compensation contour corresponding to the other functional areas remains unchanged, and the compensation contour is only corrected between the adjacent retaining boundaries of the functional area, and the bending is performed according to the corrected compensation contour. After the unloading comparison is qualified, the continuous bending forming continues.

[0015] The beneficial effects of this invention are as follows: This invention obtains the actual springback deviation of the continuous profile of the lamp hook through initial bending and unloading comparison. Then, using the first and last contact positions of the outer periphery of the support tube as objective boundaries, the lamp hook profile is divided into an orientation zone, a bonding zone, and a transition zone. By first correcting the orientation zone to establish the starting position and extension direction of the bonding zone, and then correcting the end of the bonding zone to establish another boundary, the continuous part of the bonding zone that already conforms to the finished profile is used as a holding boundary, so that subsequent reverse correction is restricted to the adjacent holding boundaries. By correcting segment by segment from the adjacent holding boundaries to the maximum deviation position and connecting them continuously, the possibility of positional changes caused by unidirectional correction accumulating to the end of the bonding zone is reduced, and the already qualified profile is no longer involved in subsequent corrections. Finally, the transition zone is corrected under the condition that the orientation zone and the bonding zone remain unchanged, so that the holding profile is determined before the opening end position is determined, thereby reducing the mutual entanglement between the holding profile and the opening position in multiple compensations, and a compensation profile suitable for continuous forming of the same batch of blanks can be gradually formed by bending again, unloading comparison, and repeating step S3. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a flowchart of the springback compensation process for bending and forming the lamp hook according to the present invention. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0019] Please see Figure 1 As shown, this embodiment provides a springback compensation process for bending and forming a lamp hook, including the following steps: S1: Perform the first bending of the same batch of blanks according to the finished outline of the lamp hook, and compare the finished outline with the connecting section as the reference after unloading. S2: Determine the location and direction of the rebound deviation; S3: The position where the end of the connecting section first meets the inner contour of the lamp hook and the outer periphery of the support tube is designated as the orientation zone; the position from the first meeting point to the last meeting point is designated as the fitting zone; and the position from the last meeting point to the open end is designated as the adjustment zone. First, the orientation zone is corrected in reverse so that the first meeting point and its extension direction match the finished contour. Keeping the orientation zone unchanged, the end of the fitting zone is corrected so that its position and extension direction match the finished contour at the last meeting point. The continuous parts of the contours at the first and last meeting points and the fitting zone that already match the finished contour are used as the retaining boundaries. During correction, the position and extension direction of each retaining boundary are not changed. The correction is carried out segment by segment from the adjacent retaining boundaries to the position where the distance between them deviates the most from the finished contour, and the corrected contours on both sides are continuously connected. Keeping the orientation zone and the fitting zone unchanged, only the adjustment zone is corrected in reverse so that the open end reaches the finished position, thus obtaining the compensation contour. S4: Bend again according to the compensation contour. If there is still a deviation after unloading and comparison, repeat step S3. S5: After passing the comparison, continuously bend and shape according to the compensation contour.

[0020] For ease of understanding, in this embodiment, "finished product profile" refers to the target profile that the lamp hook should achieve after unloading; "outer periphery of the support tube design" refers to the target outer periphery profile of the hanger or truss tube used in conjunction with the lamp hook; "first contact position" refers to the position where the inner profile begins to fit with the target outer periphery profile design when extending along the inner profile of the lamp hook from the connecting section to the open end; "last contact position" refers to the position where the inner profile ends to fit with the target outer periphery profile design when extending in the same direction; "extension direction" refers to the direction in which the corresponding profile continues to extend backward at the contact position; "maintain boundary" refers to the profile portion whose position and extension direction remain unchanged during subsequent local corrections; "position with the largest deviation from the finished product profile" is determined by comparing the unloaded lamp hook profile with the finished product profile using the connecting section as a reference.

[0021] Currently, the contour of the lamp hook after rebound is not a series of independent arc segments, but a whole that extends continuously from the connecting segment to the opening end. Therefore, if the position or direction of the end of the front contour changes during the re-bending, the starting position of the subsequent contour will also change. If the correction is made directly from one side of the connecting segment to the opening end, the positional change caused by the correction will be transmitted along the continuous contour to the side that has not yet been corrected, and the end of the mating area and the opening end may shift again in subsequent operations. To prevent this continuous transfer, this embodiment first determines three functional zones using the initial and final contact positions. The orientation zone is first corrected in reverse to ensure a stable starting position and extension direction for the bonding zone. Then, while keeping the orientation zone unchanged, the end of the bonding zone is corrected to give it another boundary. Subsequently, the contours at the beginning and end of the bonding zone, as well as the continuous portions within the bonding zone that already conform to the finished product contour, are used as holding boundaries. These contours are no longer allowed to carry the displacement of subsequent parts to be corrected. Instead, corrections are made segment by segment from both sides towards the position with the largest deviation from the finished product contour within the interval between adjacent holding boundaries, and these corrections are continuously connected. After the bonding zone is completed, the orientation and bonding zones are kept unchanged while the opening zone is corrected separately to ensure the opening reaches the finished product position. Thus, the scope of local correction is limited to the adjacent holding boundaries where the contour to be corrected is located. The contours that already meet the requirements and the determined starting and ending positions of the bonding no longer move with the next correction, thereby isolating the formation path where the holding contour and the opening position repeatedly influence each other in the prior art.

[0022] It should be noted that the design of each step S3 is based on the actual requirements of lamp hook installation and bending profile continuity: Although the profile between the end of the connecting section and the first contact position does not directly undertake the function of fitting with the support tube, its end position and direction determine where and in what direction the subsequent holding profile approaches the support tube, so it is designated as the orientation zone and corrected first; The area between the first contact position and the last contact position is the range in which the inner profile of the lamp hook and the outer periphery of the support tube are designed to hold and fit, and its beginning and end jointly define the fitting profile. Controlling only one end cannot stably determine the entire holding state, so it is designated as the fitting area, and the end of the fitting area is established first after the orientation area is determined, so that the fitting area forms a double boundary at the beginning and end; The profile after the last contact position has left the designed fitting range, and its main function is to form an opening for the support tube to enter. This part has a free end. If it is corrected in advance before the fitting area is determined, its starting position will change with the change of the end of the fitting area. Therefore, it is designated as the adjustment area and arranged to be corrected last. The continuous portion within the bonding area that already conforms to the finished product profile directly proves that this portion does not currently require compensation. If subsequent bending is allowed to cross this portion, the qualified profile will again bear the responsibility of force transmission and displacement continuation, so it is transformed into an intermediate holding boundary. The adjacent holding boundaries are advanced from both ends towards the maximum deviation position because this maximum deviation position represents the part within the interval where the bending force is most concentrated and needs to be released or increased. Establishing qualified profiles from both ends can shorten the length of the unconstrained continuous profile during each correction and avoid pushing all position changes to a single free end. The correction profiles on both sides are required to be continuously connected to ensure that the continuous extension relationship of the overall profile of the lamp hook is maintained after segmented correction. Finally, maintaining the orientation area and bonding area while only correcting the adjustment area ensures that the position adjustment of the opening end does not reverse the already determined holding profile. The above partitioning basis, correction order, and holding method are all determined by the usage function of each segment of the lamp hook, the geometric connection relationship of adjacent profiles, and the transmission relationship of local bending to the continuous profile, and are not arbitrary segmentations of the lamp hook profile.

[0023] This invention obtains the actual springback deviation of the continuous profile of the lamp hook through initial bending and unloading comparison. Then, using the first and last contact positions of the outer periphery of the support tube as objective boundaries, the lamp hook profile is divided into an orientation zone, a bonding zone, and a transition zone. By first correcting the orientation zone to establish the starting position and extension direction of the bonding zone, and then correcting the end of the bonding zone to establish another boundary, the continuous part of the bonding zone that already conforms to the finished profile is used as a holding boundary, so that subsequent reverse correction is restricted to the adjacent holding boundaries. By correcting segment by segment from the adjacent holding boundaries to the maximum deviation position and connecting them continuously, the possibility of positional changes caused by unidirectional correction accumulating to the end of the bonding zone is reduced, and the already qualified profile is no longer involved in subsequent corrections. Finally, the transition zone is corrected under the condition that the orientation zone and the bonding zone remain unchanged, so that the holding profile is determined before the opening end position is determined, thereby reducing the mutual entanglement between the holding profile and the opening position in multiple compensations, and a compensation profile suitable for continuous forming of the same batch of blanks can be gradually formed by bending again, unloading comparison, and repeating step S3.

[0024] First, it is necessary to further consider that although the above embodiments set the continuous part that already conforms to the finished product contour as the retention boundary, the local contour may be temporarily pressed onto the finished product contour by external force before the reverse bending action is released. Since the rebound of the lamp hook occurs after the bending action is removed, if this part is directly identified as the retention boundary under the stress state, the deviation that reappears after unloading will be used as the starting point of the error and carried into the subsequent correction. Therefore, in one embodiment, in step S3, after each reverse correction of the contour is completed, the lamp hook is first unloaded, and then the connecting section is re-aligned with the finished product contour. Only the continuous part that still conforms to the finished product contour after unloading is identified as the retention boundary. For the part that deviates again after unloading, the reverse correction is continued according to its deviation direction. This design makes the retention boundary taken from the actual contour after the lamp hook is stably unloaded, rather than from the temporary contour maintained by external force. This can avoid false qualified boundaries that would cause subsequent opposite corrections to be based on errors and improve the repeatability of each retention boundary.

[0025] Based on the aforementioned unloading confirmation, even if adjacent holding boundaries have been reliably established, if the process continues continuously from the same side, the remaining positional changes caused by each local bending will still concentrate on the other side along the uncorrected continuous contour. The closer to the final connection position, the longer the length not constrained by the qualified contours on both sides, and the easier it is for unilateral accumulation to change the orientation near the other holding boundary. Therefore, in one embodiment, when correcting the deviation contour between adjacent holding boundaries, the correction is performed alternately from the two holding boundaries towards the position with the largest deviation from the finished contour. After each correction, the unloading is checked in the aforementioned manner, and the newly formed continuous portion that conforms to the finished contour is incorporated into the corresponding holding boundary. This allows the two holding boundaries to gradually expand from both sides towards the middle during the correction process until the corrected contours on both sides are continuously connected. This design ensures that the uncorrected contour is always constrained by the common qualified contours on both sides, reduces positional accumulation caused by excessively long unilateral correction paths, and makes the correction results gradually stabilize in the order of "unloading confirmation to boundary expansion and then to further correction".

[0026] Meanwhile, to ensure the independent establishment of the end boundary of the bonding area, the continuously connected opening area also needs to be addressed. Before the end of the bonding area reaches the finished product contour, the starting position and extension direction of the opening area will change along with the end of the bonding area. If the opening area is partially bent at this point, it will form a contour based on an unstable starting point. After the end of the bonding area is corrected again, the corrected opening end will still shift as a whole. To address this, in one embodiment, the opening area is not partially bent when correcting the end of the bonding area, allowing it to maintain its own contour and move as a whole with the end of the bonding area. Only after the position and extension direction of the end of the bonding area are confirmed to match the finished product contour after unloading is the bonding area kept unchanged while the opening area is corrected separately. This separates "determining the end of the bonding area" and "forming the opening contour" into two independent process stages, preventing repeated corrections of the opening area due to an unstable reference point and reducing the possibility of the opening end adjustment causing reverse pull on the contour.

[0027] Furthermore, after the initial and final boundaries of the bonding area have stabilized, a correct initial and final contact position does not necessarily mean that the entire contour between them conforms to the design periphery of the support pipe. This is because a continuous curved contour can be correctly positioned at both ends, but due to local springback, it can arch away from the design periphery in the middle, resulting in a state where the initial and final positions are correct but there is a gap in the middle. To eliminate this state, in one embodiment, the bonding area is fitted with the design periphery contour of the support pipe, and the actual continuous portion that already conforms to the design periphery contour remains unchanged. The gap contour located between adjacent actual continuous portions is corrected in reverse from both ends to the middle until the initial contact position and the final contact position remain unchanged and the gap contour conforms to the design periphery contour. This design expands the determination of the bonding area from checking only the two endpoints to checking the continuous holding contour between the endpoints, and continues to use the principle of local correction within adjacent boundaries, which can improve the bonding state in the middle without changing the bonding start and end positions.

[0028] After completing the contact continuity correction of the aforementioned bonding area, it is also necessary to confirm whether the support tube can actually enter the bonding area through the opening. The fact that the opening end reaches the corresponding point in the finished product contour only indicates that one endpoint is correctly positioned. However, the support tube has a continuous outer circumferential contour, and its installation process involves the entire outer circumferential contour passing through the adjustment area along the installation direction. Therefore, even if the opening end is correct, there may still be contours in the adjustment area that interfere with the support tube before the opening end. To address this, in one embodiment, the designed outer circumferential contour of the support tube is gradually moved into the bonding area from the outside of the opening along the lamp hook's installation direction. When the designed outer circumferential contour interferes with the adjustment area, the orientation area and bonding area remain unchanged, and only the continuous part in the adjustment area where interference first occurs is reversed. Then, the moving-in check is performed again until the designed outer circumferential contour can enter the bonding area through the opening. This design uses the actual installation path instead of a single endpoint judgment, eliminating local interference along the path distribution in the adjustment area without sacrificing the already formed holding contour, thus verifying both the opening position and the installation passability simultaneously.

[0029] Besides local deviations within functional zones, the same continuous deviation may also cross the initial contact point between the orientation zone and the mating zone, or the final contact point between the mating zone and the transition zone. If the cross-zone deviation is treated as a single continuous bend, the correction effect will extend beyond the contact boundary used to isolate the functional zones, causing the correction of one area to change the starting conditions of the other area again, weakening the limiting effect of the partition itself. In one embodiment, the continuous cross-zone deviation is divided into two parts to be corrected based on the initial or final contact point. The part closer to the connecting segment is corrected first. After unloading, the contact point and its extension direction are confirmed. Then, the contact point and the already corrected part are kept unchanged. Subsequently, the part to be corrected located in the other functional zone is corrected. This design transforms continuous surface deviations across functional boundaries from a single cross-zone correction into two intra-zone corrections with the contact point as the common boundary, maintaining the sequential reference relationship between the orientation zone, mating zone, and transition zone.

[0030] When the aforementioned zonal correction enters the repeated bending test stage, it is possible that the same contour part, after the previous unloading, is located on one side of the finished contour, but after the next unloading, it crosses the finished contour to the other side. This reverse deviation indicates that the subsequent compensation has crossed the position that would allow the formed contour to approach the target. If the same magnitude of correction is applied based solely on the latest deviation direction, the part is likely to fluctuate back and forth on both sides of the finished contour. To suppress this repetition, in one embodiment, the compensation contours used when reverse deviations occurred in the previous two instances are used as the correction boundaries on both sides. A new compensation contour is formed only between the two correction boundaries, and this correction is limited to the corresponding adjacent holding boundaries. This allows the selection range of the next contour to be narrowed using the two actual bending test results already obtained, preventing the correction from crossing the verified boundaries again, and preventing changes to qualified contours outside the same area to handle an over-compensated part.

[0031] After the compensation profile has been confirmed through repeated trial bending, it is necessary to stabilize and transform the profile formed by the partitions into the forming profile used in continuous production. If the profile is continuously flipped unidirectionally from the connecting section to the opening end, the small positional changes formed by the previous flipping will become the new reference for the next section and accumulate segment by segment. Ultimately, this may cause the first contact position, the last contact position, or the opening end to deviate from the verified compensation profile. To avoid this transformation error, in one embodiment, the compensation profile is flipped in partitions. The orientation area is flipped from the connecting section to the first contact position, the fitting area is flipped from both ends to the middle and continuously connected based on the first and last contact positions, and the transition area is flipped from the last contact position to the opening end. During the flipping process, the contact positions and their extension directions remain unchanged. This design ensures that the formation sequence of the production profile is consistent with the double boundary correction logic in step S3, which can prevent the continuous transmission of local errors to the opening end by unidirectional flipping and retain the functional area boundaries confirmed in the trial bending stage.

[0032] Finally, when the compensation contour is used in continuous bending forming, a single formed part may still deviate only in a certain functional area due to changes in the individual state of the blank or local state during the continuous forming process. If a local deviation is found and the entire compensation contour is readjusted, the other two functional areas that were originally qualified will also change, and the previously confirmed zoning compensation results will become ineffective. To address this, in one embodiment, during the continuous bending forming process in step S5, the formed part extracted during the continuous forming process is unloaded and compared with the finished product contour. The functional area where the deviation occurs is first determined, and the compensation contours corresponding to the other functional areas are kept unchanged. The compensation contour is only corrected between the adjacent maintaining boundaries of the functional area. Then, a test bend is performed according to the corrected compensation contour. After unloading and comparison, if it passes the test, continuous forming continues. This design restricts the contour maintenance in continuous production to the functional area where the deviation actually occurs. This avoids local changes causing a full contour readjustment and allows the zoning boundaries formed during the trial production stage to continue to serve as the basis for diagnosis and correction in mass production.

[0033] Working principle and usage process of this invention: The working principle is as follows: Although the connecting section, holding section, and opening section of the lamp hook respectively serve the functions of connection, fitting and holding, and guiding insertion, all three are formed by continuous bending of the same blank. The position and extension direction of the end of the first part become the geometric starting point of the second part. Therefore, the springback compensation cannot treat the deviation parts as independent points that are not related to each other. This invention uses the first and last contact positions of the outer periphery of the support tube as the positions where the function and geometric relationship change simultaneously. The continuous contour is divided into an orientation zone, a fitting zone, and an adjustment zone. First, the starting boundary of the fitting zone is determined, and then its ending boundary is determined. The continuous part that has been unloaded and confirmed to be qualified within the zone is transformed into an intermediate holding boundary. Each contour to be corrected is restricted between adjacent holding boundaries and gradually converges from both sides towards the maximum deviation position. The qualified part is no longer used as the force transmission and displacement continuation path for subsequent correction. After the fitting zone is completed, the adjustment zone is isolated and corrected. In this way, the original correction process that was transmitted along the continuous contour to the opening end is transformed into multiple local correction processes restricted by adjacent boundaries, so that the determination of the holding contour and the determination of the opening position are completed in a stable sequential relationship.

[0034] The process is as follows: First, select the blank from the same batch as the continuous production, and perform the first bending according to the finished outline of the lamp hook. After complete unloading, compare the finished outline with the connecting section as a unified benchmark to determine each deviation and its direction. Then, divide the three functional areas according to the first and last contact positions, and complete the correction of the orientation area, the end correction of the bonding area, the opposite correction between adjacent holding boundaries of the bonding area, and the adjustment area correction in sequence. After each local correction is completed, unloading can be performed for verification and the holding boundary can be expanded. After the bonding area is completed, the outer periphery of the support tube design can be fitted to check the middle gap. After the adjustment area is completed, local interference can be checked along the loading path. If there is a deviation across areas, it can be handled separately at the contact position. After obtaining the compensation outline, bend and unload for comparison. If there is still a deviation, repeat the correction between adjacent holding boundaries. If there is a deviation in the front and back directions, limit the new correction range with two compensation outlines. After the comparison is qualified, the compensation outline is made into a continuous forming outline according to the three-zone benchmark and used for continuous bending forming. If a local deviation is found during production, only the corresponding functional area is corrected. After passing the trial bending and unloading comparison, production can continue.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A springback compensation process for bending and forming lamp hooks, characterized in that, Includes the following steps: S1: Perform the first bending of the same batch of blanks according to the finished outline of the lamp hook, and compare the finished outline with the connecting section as the reference after unloading. S2: Determine the location and direction of the rebound deviation; S3: The position where the end of the connecting section first meets the inner contour of the lamp hook and the outer periphery of the support tube is designated as the orientation zone. The position from the first meeting point to the last meeting point is designated as the fitting zone. The position from the last meeting point to the opening end is designated as the adjusting zone. First, the orientation zone is corrected in reverse so that the first meeting point and its extension direction match the finished contour. Keeping the orientation zone unchanged, the end of the fitting zone is corrected so that its position and extension direction match the finished contour at the last meeting point. The continuous part of the contour at the first meeting point and the last meeting point, and the fitting zone that already matches the finished contour, is used as the retaining boundary. During the correction, the position and extension direction of each retaining boundary are not changed. The correction is carried out segment by segment from the adjacent retaining boundary towards the position with the largest distance from the finished contour between them, and the corrected contours on both sides are continuously connected. Keeping the orientation zone and the fitting zone unchanged, only the adjusting zone is corrected in reverse so that the opening end reaches the finished position, thus obtaining the compensation contour. S4: Bend again according to the compensation contour. If there is still a deviation after unloading and comparison, repeat step S3. S5: After passing the comparison, continuously bend and shape according to the compensation contour.

2. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: In step S3, after each reverse correction of the contour is completed, the lamp hook is unloaded and re-aligned with the finished contour using the connecting segment; only the continuous part that still conforms to the finished contour after unloading is identified as the boundary to be maintained, and the part that deviates again after unloading continues to be reverse corrected.

3. The springback compensation process for bending and forming a lamp hook according to claim 2, characterized in that: When correcting the deviation profile between adjacent holding boundaries, the correction is performed alternately from the two holding boundaries towards the position with the largest deviation from the finished product profile. After each unloading, the newly formed continuous part that matches the finished product profile is incorporated into the corresponding holding boundary until the corrected profile between the two holding boundaries is continuously connected.

4. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: When correcting the end of the bonding area, do not bend the opening area locally, so that the opening area maintains its own outline and moves as a whole with the end of the bonding area; after the position and extension direction of the end of the bonding area are confirmed to match the outline of the finished product after unloading, the opening area is corrected separately while keeping the bonding area unchanged.

5. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: After the fitting area is corrected, the fitting area is fitted with the outer periphery of the support tube design. The continuous part of the fitting area that already matches the outer periphery of the design remains unchanged. The gap profile between adjacent continuous parts is corrected in reverse from both ends to the middle until the first contact position and the last contact position remain unchanged and the gap profile matches the outer periphery of the design.

6. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: After the adjustment area is corrected, the outer periphery of the support tube is moved from the outside of the opening into the fitting area along the insertion direction of the lamp hook. When the outer periphery of the design interferes with the adjustment area, the orientation area and the fitting area remain unchanged. Only the continuous part of the adjustment area where interference first occurs is reversed and the movement and correction are repeated until the outer periphery of the design can enter the fitting area through the opening.

7. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: When the same continuous deviation part determined in step S2 crosses an adjacent functional area, the continuous deviation part is divided into two parts to be corrected based on the first contact position or the last contact position. First, the part to be corrected that is close to the connecting section is corrected. After unloading and confirming the contact position and its extension direction, the already corrected part to be corrected remains unchanged, and then the other part to be corrected is corrected.

8. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: When repeating step S3 in step S4, when the same contour part is located on both sides of the finished contour after two adjacent bending unloadings, the compensation contour used in the two adjacent bendings is used as the correction boundary on both sides of the contour part, a new compensation contour is formed between the two correction boundaries, and the correction range is limited to the corresponding adjacent holding boundaries.

9. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: Before step S5, the compensation contour partition confirmed in step S4 is converted into a continuous forming contour; wherein, the orientation area is converted based on the connecting section, the bonding area is converted from both ends to the middle based on the first contact position and the last contact position and is continuously connected, and the opening area is converted from the last contact position to the opening end. During the conversion process, each contact position and its extension direction remain unchanged.

10. The springback compensation process for bending and forming a lamp hook according to claim 1, characterized in that: In the continuous bending process of step S5, the extracted molded part is unloaded and compared with the finished product contour. When the contour deviates only in one of the functional areas, the compensation contours corresponding to the other functional areas remain unchanged. The compensation contours are only corrected between the adjacent retaining boundaries of the functional area. The part is then bent according to the corrected compensation contour. After the unloading comparison is qualified, the continuous bending process continues.

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