A metal door plate bending laser edge sealing machine and an edge sealing process

Abstract

The present application relates to the technical field of door plate edge sealing equipment, and discloses a metal door plate bending laser edge sealing machine and an edge sealing process. The edge sealing machine comprises a rack, the rack has a first side and a second side, the first side is provided with a conveying and positioning device for clamping a composite door plate and driving the composite door plate to move along the length direction of the rack, so that the edge to be sealed of the door plate is suspended to the second side; the second side of the rack is sequentially provided with a first slotting mechanism, an edge fine milling mechanism, a stress groove pre-processing mechanism, a flanging and bending mechanism, a flattening mechanism and a welding mechanism along the conveying direction. The welding mechanism comprises a laser welding head and a welding pressure unit, the welding pressure unit is arranged behind the laser welding head along the conveying direction, and is used for applying mechanical flattening force to the weld area which has not cooled down while laser welding. The present application also discloses an edge sealing process using the above edge sealing machine. The present application aims to provide a metal door plate bending laser integrated edge sealing equipment and process which can realize synchronous bending and welding and one-time forming.

Description

Technical Field

[0001] This invention relates to the field of door panel edge banding equipment technology, and in particular to a metal door panel bending laser edge banding machine and edge banding process. Background Technology

[0002] In the manufacturing of fire doors, security doors, and high-end home decoration doors, composite door panels typically consist of a first panel on the front, a second panel on the back, and a core filler between them. To ensure the door panel's sealing, aesthetics, and structural strength, edge sealing is required on all four sides of the door panel before it leaves the factory. This involves bending and folding the edge of one panel over the end face of the other panel, and then fixing it in place by welding or other methods.

[0003] Currently, most edge banding production processes employ a discrete processing model involving multiple steps and equipment. This results in severely fragmented processes and extremely low automation. Each step must be completed on different independent equipment, leading to a disjointed production flow. This reliance on skilled workers results in low production efficiency and high labor costs. Furthermore, consistent edge banding quality is difficult to control. Because bending and welding are performed independently, the transfer of processing benchmarks between steps is discontinuous, easily leading to cumulative positioning errors during repeated clamping and handling of door panels. In particular, the bending process relies heavily on manual experience to judge the flange angle, making it difficult to guarantee consistency in the flange angle and the tightness of the wrapping. This results in defects such as loose wrapping and uneven gaps in the finished edge banding, leading to a high scrap rate. Summary of the Invention

[0004] The main objective of this invention is to provide a metal door panel bending laser edge banding machine and edge banding process, aiming to provide an integrated metal door panel bending laser edge banding equipment that achieves simultaneous bending and welding in one step.

[0005] To achieve the above objectives, the present invention proposes a metal door panel bending laser edge banding machine for edge banding composite door panels. The composite door panel includes a first panel, a second panel, and a core filler located between them. The metal door panel bending laser edge banding machine includes a frame having a first side and a second side. A conveying and positioning device is provided on the first side for clamping the composite door panel and driving it to move along the length of the frame, causing the edge portion of the composite door panel to be edge banded to extend through the frame and overhang to the second side. On the second side of the frame, along the conveying direction of the composite door panel, the following are arranged sequentially: The first grooving mechanism is used to cut the edge of the first panel inward relative to the second panel at the edge of the composite door panel to form a stepped structure with the edge of the second panel extending outward. An edge milling mechanism is used to perform milling and finishing on the end face edge formed after the first panel is cut; A stress groove pre-processing mechanism is used to process shallow stress relief grooves at the root of the second panel to be bent; A folding and bending mechanism is used to fold the extended edge of the second panel upwards and cover the end face of the first panel; A flattening mechanism is used to apply a flattening force to the bent area after the flange is wrapped. A welding mechanism used to perform laser welding on the pressed joints.

[0006] In one possible implementation, following the welding mechanism along the conveying direction, the following are also arranged in sequence: Weld seam scraping mechanism, used to scrape off weld slag and burrs produced after welding; The surface finishing mechanism is used to polish the surface of the weld after scraping.

[0007] In one possible implementation, the edge milling mechanism includes at least one first milling component and a plurality of second milling components, wherein the first milling component and the second milling components are arranged alternately along the conveying direction of the composite door panel, and the edge of the composite door panel to be processed is sequentially and alternately passed through the second milling components and the first milling components to perform multi-level composite milling processing.

[0008] In one possible implementation, the second finish milling assembly includes: The first drive motor has a milling cutter mounted on its output end; The clamping roller assembly is used to maintain a stable fit between the machined surfaces during milling. A omnidirectional adjustable air duct is located on the side of the milling cutter to blow away metal chips in real time during the machining process.

[0009] In one possible implementation, the first finish milling assembly includes: The second drive motor has a precision milled saw blade installed at its output end; A dust extraction hood is installed over the outside of the precision milling saw blade and has an air inlet for connecting an external dust extraction device.

[0010] In one possible implementation, the flanging and bending mechanism includes a plurality of bending pressure members arranged in a stepped manner, with the effective height of each bending pressure member increasing in the direction away from the composite door panel body.

[0011] In one possible implementation, the welding mechanism includes a laser welding head and a welding pressing unit. The laser welding head is used to perform laser welding on the pressed joint, and the welding pressing unit is arranged behind the laser welding head along the conveying direction to apply mechanical pressing force to the weld area that has not yet cooled while performing laser welding.

[0012] In one possible implementation, the flattening mechanism includes a rolling assembly and a pneumatic drive assembly; The rolling assembly includes multiple rolling rollers disposed in the area of ​​the composite door panel to be flattened, for fitting against the bent surface after the edge is covered; The pneumatic drive assembly is driven by the rolling assembly and is used to drive the rolling assembly to move toward the composite door panel to apply a flattening force.

[0013] To achieve the above objectives, the present invention also provides a metal door panel bending laser edge banding process, applied to the metal door panel bending laser edge banding machine described in any of the above possible embodiments, comprising the following steps: The composite door panel to be processed is clamped and conveyed along the processing direction, so that the edge to be sealed is suspended in the air; the first panel is cut at the edge, so that it is recessed inward relative to the second panel, forming a stepped structure with the edge of the second panel extending outward. The edge of the end face formed after the first panel is cut is milled for precision machining. A shallow stress-relieving groove is machined at the root of the second panel to be bent; Fold the extended edge of the second panel upwards and cover the end face formed after the first panel has been cut through precision milling; Apply a flattening force to the bent area after the edge is wrapped; Laser welding is performed on the joint area after pressing, and mechanical flattening force is applied simultaneously behind the moving direction of the weld pool during laser welding to eliminate welding thermal deformation. The weld seam formed after welding is scraped and repaired by removing welding slag and burrs; Polish and finish the repaired weld surface.

[0014] The technical solution of this invention achieves fully automated continuous processing of composite door panel edge banding from grooving to polishing in a single loading process by placing the conveying and positioning device on the first side of the frame and integrating each processing mechanism sequentially on the second side of the frame, using a "reverse clamping and conveying, front edge processing" layout, and arranging eight processes along the processing direction: first grooving, edge milling, stress groove pre-processing, flanging and bending, flattening, welding, weld scraping and surface finishing. This significantly shortens the process flow time and solves the problems of scattered processes, cumbersome handling and low automation in existing processes. Simultaneously, by bending the second panel... The root is pre-processed with a shallow stress-relieving groove, and combined with multiple bending pressure components arranged in a stepped manner for progressive flanging and wrapping. This allows the bending stress to be released evenly along the preset weak line and the deformation of the sheet metal to transition smoothly, effectively solving the problems of bending cracking and springback deformation, and ensuring the precise consistency of the flanging angle and the flatness and fit of the wrapping surface. In addition, the welding pressing and straightening unit set in the welding mechanism continuously applies mechanical flattening force to the flanging and wrapping area while laser welding is being performed, realizing synchronous processing of pressing and welding. This allows the joint to melt and solidify under the pressure, eliminating warping and incomplete welding defects caused by welding thermal deformation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the metal door panel bending laser edge banding machine of the present invention; Figure 2 This is a schematic diagram of the structure of the first grooving mechanism and the edge milling mechanism of the present invention; Figure 3 This is a schematic diagram of the edge milling mechanism and stress groove pre-processing mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the flange bending mechanism and the flattening mechanism of the present invention; Figure 5 This is a schematic diagram of the welding mechanism, weld repair mechanism, and surface finishing mechanism of the present invention.

[0017] Explanation of icon numbers: 1. Frame; 11. Conveying and positioning device; 12. First side; 13. Second side; 2. First grooving mechanism; 3. Edge milling mechanism; 31. First milling assembly; 311. Second drive motor; 312. Dust extraction hood; 313. Milling saw blade; 32. Second milling assembly; 321. First drive motor; 322. Pressing roller assembly; 323. Universal adjustable air blowing duct; 324. Milling cutter; 4. Stress groove pre-processing mechanism; 5. Flanging and bending mechanism; 51. Bending and pressure application component; 6. Flattening mechanism; 61. Rolling assembly; 62. Pneumatic drive assembly; 7. Welding mechanism; 71. Laser welding head; 72. Welding pressure adjustment unit; 8. Weld seam repair and scraping mechanism; 9. Surface finishing mechanism.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] To address the problems in the background technology, this invention proposes a metal door panel bending laser edge banding machine for edge banding composite door panels. The composite door panel includes a first panel, a second panel, and a core filler located between them. The metal door panel bending laser edge banding machine includes a frame 1, which has a first side 12 and a second side 13. The first side 12 is provided with a conveying and positioning device 11 for clamping the composite door panel and driving it to move along the length direction of the frame 1, causing the edge portion of the composite door panel to be edge banded to extend through the frame 1 and overhang to the second side 13. On the second side 13 of the frame 1, along the conveying direction of the composite door panel, the following are arranged sequentially: The first grooving mechanism 2 is used to cut the edge of the first panel inward relative to the second panel at the edge of the composite door panel to form a stepped structure with the edge of the second panel extending outward. The edge milling mechanism 3 is used to perform milling and finishing on the end face edge formed after the first panel is cut; The stress groove pre-processing mechanism 4 is used to process a shallow stress relief groove at the root of the second panel to be bent. The flange bending mechanism 5 is used to fold the extended edge of the second panel upward and cover the end face of the first panel; Flattening mechanism 6 is used to apply flattening force to the bent area after the flange is wrapped; Welding mechanism 7 is used to perform laser welding on the pressed joint.

[0021] Combined with reference Figures 1 to 5 As shown, in this embodiment, the equipment is specifically designed for edge banding of composite door panels. The composite door panel is a semi-finished component to be edge banded, consisting of a first panel on the front, a second panel on the back, and a core filler between them. Both the first and second panels are rectangular thin metal sheets with identical outer dimensions and flush sides before edge banding, leaving a certain gap between them. The core filler can be a fire-resistant and heat-insulating material, such as perlite board, rock wool board, or honeycomb core material, which is tightly filled in the entire area between the first and second panels and adheres to the inner surfaces of both panels. Before entering the edge banding machine, the four edges of the composite door panel are in an open, unsealed state; that is, the edges of the first and second panels are not bent or covered in any way, and the four sidewalls of the core filler are directly exposed. Each edge cross-section presents a three-layer structure with the first panel, core filler, and second panel stacked sequentially. The door panel is fed into the equipment in the semi-finished state, and its main body is clamped by the conveying and positioning device 11. The edge to be sealed on one side is passed through the frame 1 and extended to the second side 13 so that each processing mechanism can complete the sealing process in sequence.

[0022] The machine mainly includes a frame 1 extending along its length, which has a first side 12 and a second side 13. During operation, the first side 12 faces inward and is used for clamping and conveying the main body of the door panel; the second side 13 serves as the processing side, allowing the door panel edge to extend and be processed sequentially. Specifically, a conveying and positioning device 11 is provided on the first side 12 of the frame 1. This device can be composed of a servo motor-driven synchronous belt clamping mechanism or a roller guide mechanism. Its function is to firmly clamp the main body of the composite door panel to be processed and drive it to move in a uniform linear motion along the length of the frame 1. During this conveying process, the edge portion of the composite door panel to be sealed passes through the guide gap reserved in the middle of the frame 1 and extends horizontally to the second side 13 of the frame 1, thus placing the main body of the door panel and the edge to be processed on opposite sides of the frame 1, achieving physical spatial isolation between conveying and processing, ensuring that the wide door panel is not affected by cantilever torque during conveying and operates smoothly. On the second side 13 of the frame 1, i.e. the side where the door panel edge extends, a first grooving mechanism 2, an edge milling mechanism 3, a stress groove pre-processing mechanism 4, a flanging and bending mechanism 5, a flattening mechanism 6, and a welding mechanism 7 are fixedly installed sequentially from front to back along the conveying direction of the door panel. Each mechanism is mounted on the frame 1 via an independent bracket, with its working head facing the extended edge of the door panel.

[0023] Specifically, the first grooving mechanism 2 is used to perform vertical cutting at the edge of the composite door panel. This mechanism is equipped with a milling spindle driven by a cylinder for vertical feed, and a disc milling cutter 324 is mounted at the end of the spindle. When the door panel is transported to this station, the cylinder pushes the rotating milling cutter 324 downwards to perform a fixed-depth cut on the edge of the first panel of the composite door panel, simultaneously cutting the core filler material. This causes the edge of the first panel to be recessed inwards relative to the second panel by a certain distance, thus exposing the edge of the second panel and forming a stepped structure of uniform width. This stepped structure provides the necessary space and structural basis for subsequently flipping and bending the second panel and covering it onto the end face formed after the first panel has been cut.

[0024] Following the first grooving mechanism 2 is the edge milling mechanism 3. This mechanism is specifically designed for milling and finishing the exposed edge of the first panel after it has been cut. Since the first grooving process involves vertical cutting, the cut surface may have burrs, microscopic unevenness, and other defects. The edge milling mechanism 3 uses a high-speed rotating milling cutter 324 to move along the cut edge, removing burrs and adjusting the flatness and perpendicularity of the edge to ensure a tight fit when the edge is subsequently covered by the second panel. After the edge milling mechanism 3, a stress groove pre-processing mechanism 4 is installed. This mechanism processes the root area of ​​the second panel where it will be bent. Similar in structure to the first grooving mechanism 2, this mechanism mills a shallow stress-relieving groove extending along the length of the door panel on both sides of the root area of ​​the second panel to be bent. Its function is to pre-destroy the stress concentration point inside the metal, so that when the sheet metal is turned and bent later, the bending deformation can occur smoothly along the preset weak line, thereby fundamentally avoiding the tearing or cracking of the material caused by excessive stress during the bending process.

[0025] After the stress groove is processed, the edge of the door panel enters the flanging bending mechanism 5. This mechanism consists of a set of bending pressure components 51 arranged in a stepped manner from the inside to the outside along the width direction of the door panel. The pressure components can be driven to lift and lower synchronously by hydraulic cylinders or high-torque servo electric cylinders. The working height of each bending pressure component 51 increases sequentially. When they lift upward synchronously, they can apply a progressive, linear bending force from low to high to the extended edge of the second panel, smoothly folding it upward by 90 degrees, and finally tightly wrapping it to the end face of the first panel that has been precision milled, forming a regular edge sealing structure. After the bending and wrapping are completed, the flattening mechanism 6 applies pressure to the bending area. This flattening mechanism includes a rolling assembly 61, which includes multiple flattening rollers located on the side of the door panel. The working surfaces of the arranged flattening rollers face the folded end face of the second panel. The pneumatic drive assembly drives the rolling assembly horizontally towards the folded edge wrapping area of ​​the door panel, applying flattening force from the side to eliminate springback, local small wrinkles, and internal stress that may occur during the bending process, ensuring that the wrapped edge is completely pressed and adhered to the end face formed after the first panel is cut. Finally, the welding mechanism 7 performs laser welding on the flattened joint. This mechanism includes a laser welding head 71, which performs continuous laser scanning welding along the joint. As a core improvement, a welding pressure-adjusting unit 72 is arranged adjacent to the laser welding head 71 along the side perpendicular to the conveying direction. This unit consists of a flattening roller and a drive cylinder, which can synchronously follow and apply mechanical flattening force to the weld area before the laser welding molten pool has completely cooled and solidified. This special process of welding and flattening at the same time uses external mechanical force to promptly offset the local thermal deformation stress caused by laser heat input, thereby obtaining an extremely flat and smooth weld surface, and completely solving the problems of post-weld warping and heat-affected zone depression that are difficult to avoid in traditional welding processes.

[0026] In one possible implementation, following the welding mechanism 7 along the conveying direction, the following are also arranged in sequence: The weld repair and scraping mechanism 8 is used to scrape off weld slag and burrs produced after welding. The surface finishing mechanism 9 is used to polish the surface of the weld after scraping.

[0027] Combined with reference Figure 1 and Figure 2As shown, in this embodiment, a weld scraping mechanism 8 and a surface finishing mechanism 9 are sequentially arranged behind the welding mechanism 7 along the conveying direction to form a complete post-weld processing section. The weld scraping mechanism 8 is fixedly installed on the second side 13 of the frame 1, and its core working component is a set of carbide scraper assemblies that can be finely adjusted along the vertical direction and the width direction of the door panel. The scraper assembly is driven by a reciprocating cylinder or a lead screw slide, and can make linear reciprocating motion along the weld extension direction. In actual operation, the door panel moves step by step under the drive of the conveying positioning device 11. After the weld area enters the station, the scraper moves close to the weld surface under the power drive, and removes the welding slag, spatter particles, and irregular excess height and overflow on the weld surface in one go by physical cutting, so that the weld obtains a preliminary smooth shape. Immediately following the weld scraping mechanism 8, the surface finishing mechanism 9 is provided. The mechanism consists of a high-speed motor and a polishing wheel mounted on the motor's output shaft, with the outer circumference of the polishing wheel facing the weld area to be treated. The motor is fixed to an adjustable bracket equipped with a spring buffer or pneumatic floating mechanism to ensure that the polishing wheel maintains constant contact pressure with the weld surface during processing. During operation, the high-speed rotating polishing wheel continuously grinds and polishes the weld area after it has been trimmed by a scraper, removing fine scratches left by the scraper and further eliminating minor unevenness on the weld surface. Ultimately, this ensures that the surface roughness and gloss of the edge-sealing weld are consistent with the first and second panels of the door panel.

[0028] In one possible implementation, the edge milling mechanism 3 includes at least one first milling component 31 and a plurality of second milling components 32. The first milling component 31 and the second milling components 32 are arranged alternately along the conveying direction of the composite door panel, and the edge of the composite door panel to be processed is sequentially and alternately processed by the second milling component 32 and the first milling component 31 for multi-level composite milling.

[0029] Combined with reference Figure 2 and Figure 3 As shown, in this embodiment, the first precision milling assembly 31 and the second precision milling assembly 32 are both fixedly installed on the second side 13 of the frame 1 and are arranged in an alternating pattern along the conveying direction of the composite door panel. In actual arrangement, the edge of the door panel to be processed first undergoes preliminary finishing by multiple second precision milling assemblies 32, then enters a first precision milling assembly 31 for deep milling, and finally passes through at least one second precision milling assembly 32 to complete the final finishing process.

[0030] In one possible implementation, the second precision milling assembly 32 includes: The first drive motor 321 has a milling cutter 324 installed at its output end; The clamping roller assembly 322 is used to maintain stable contact between the machined surfaces during milling; The omnidirectional adjustable air duct 323 is located on the side of the milling cutter 324 and is used to blow away metal chips in real time during the machining process.

[0031] Combined with reference Figure 2 and Figure 3 As shown, in this embodiment, the second precision milling assembly 32 serves as a precision trimming unit within the edge milling mechanism 3, specifically including a first drive motor 321, a clamping roller assembly 322, and a universally adjustable air duct 323. The first drive motor 321 is a spindle motor, and a carbide end mill 324 is detachably mounted on its output shaft end via a flexible collet or locking nut. The motor is fixed to a finely adjustable mounting base, which is connected to the frame 1 via a dovetail guide rail and equipped with a micrometer adjustment knob for precisely setting the radial feed rate of the end mill 324 relative to the cutting end face of the first panel of the door panel. The clamping roller assembly 322 is located in front of the first drive motor 321, i.e., on the side closer to the door panel's material feeding direction. The roller assembly consists of multiple rollers. When the edge of the composite door panel enters the work station, the rollers fit against the lower surface of the door panel edge to form a guide clamping pair with a certain clamping force. This ensures that the processed surface of the door panel edge is always tightly fitted against the preset reference surface during the milling process, thus guaranteeing the stability of the processing dimensions.

[0032] A universal adjustable air duct 323 is fixedly installed on the side of the milling cutter 324. The main body of this duct is made of corrugated metal or a flexible tube segment connected by multiple ball joints. One end is connected to the compressed air pipeline on the frame 1 via a quick-connect coupling, and the other end is a flat or round air nozzle. The operator can manually bend the duct to precisely adjust the air blowing direction of the air nozzle to align with the wedge-shaped area where the cutting edge of the milling cutter 324 contacts the edge of the door panel. During machining, an external compressed air source continuously supplies high-pressure gas, which is ejected at high speed from the nozzle through the duct, forming a strong directional airflow. This airflow blows away the fine metal chips and dust generated during milling from the machining surface in real time, preventing chips from being caught between the roller and the door panel and causing indentations or scratches. It also prevents chips from accumulating at the cutting edge of the milling cutter 324 and affecting the cutting effect.

[0033] In one possible implementation, the first precision milling assembly 31 includes: The second drive motor 311 has a precision milling saw blade 313 installed at its output end; The dust extraction hood 312 covers the outside of the precision milling saw blade 313 and has an air inlet for connecting an external dust extraction device.

[0034] Combined with reference Figure 2 and Figure 3As shown, in this embodiment, the first precision milling assembly 31 serves as the main milling unit in the edge precision milling mechanism 3, specifically including a second drive motor 311, a precision milling saw blade 313, and a dust extraction hood 312. The second drive motor 311 is fixedly mounted on the processing table of the second side 13 of the frame 1 via a motor base. A linear slide rail and a lead screw feed mechanism are provided under the motor base, and the forward and backward position of the entire motor assembly along the direction perpendicular to the door panel conveying can be adjusted by rotating a handwheel or an electric push rod, thereby precisely controlling the cutting depth of the precision milling saw blade 313 on the cutting end face of the first panel. The output shaft of the second drive motor 311 extends horizontally and points towards the overhanging edge of the door panel, and the precision milling saw blade 313 is fixedly mounted at the end of the output shaft via a key connection and a flange. The precision milling saw blade 313 adopts a combined double saw blade structure, that is, two carbide circular saw blades of the same specification are respectively mounted on two independent spindles on the frame and arranged side by side at a preset interval along the door panel conveying direction. During the cutting process, the first saw blade performs rough milling on the end face, and the second saw blade performs finish milling on the end face, to achieve multi-stage composite processing, improving the surface finish and processing efficiency. A dust extraction hood 312 is installed outside the finish milling saw blade 313. This hood is made of welded or stamped metal sheet, forming a semi-enclosed shell structure that covers most of the circumferential area of ​​the finish milling saw blade 313 from above and sides, leaving an opening only on the processing surface in contact with the door panel edge to allow the saw blade to cut into the workpiece. At least one air inlet is provided on the top or side wall of the dust extraction hood, which is connected to the workshop's centralized dust extraction system or the suction pipe of an independent industrial vacuum cleaner via a flange interface and a retractable hose. During processing, after the external dust extraction device is activated, a continuous negative pressure is formed inside the dust extraction hood, efficiently drawing in the large amount of metal dust and fine chips generated by the high-speed rotation of the saw blade and discharging them to a designated collection point, effectively preventing dust from spreading to other workstations and the surrounding working environment, and keeping the processing area clean.

[0035] In one possible implementation, the flange bending mechanism 5 includes a plurality of bending pressure members 51 arranged in a stepped manner, with the effective height of each bending pressure member 51 increasing in the direction away from the composite door panel body.

[0036] Combined with reference Figure 4As shown, in this embodiment, the flanging bending mechanism 5 is used to fold the extended edge of the second panel upwards by 90 degrees and cover the end face of the first panel. Its structure includes multiple bending pressure members 51 arranged in a stepped manner, with the working height of each bending pressure member 51 increasing in the direction away from the main body of the composite door panel. Specifically, the bending pressure members 51 are a group of independent pressure blocks arranged sequentially from the inside to the outside along the width direction of the door panel. The number of pressure blocks can be set to six to ten according to the folding width of the door panel edge. The cross-section of each pressure block is cylindrical or trapezoidal, and its upper surface is the working surface that contacts the lower surface of the second panel. This group of pressure blocks is installed on a common lifting base, which is synchronously driven by multiple high-thrust hydraulic cylinders or servo electric cylinders located below it, allowing for smooth vertical lifting. The installation height of each pressure block relative to the lifting base is not the same. Instead, based on the lifting base, from the inside near the main body of the door panel to the outside, the working surface height of each pressure block increases by a fixed step increment. In the initial state, the working surface of the innermost first-level pressure block is in contact with or has a slight gap from the lower surface of the horizontally overhanging second panel, while the working surface of the outermost last-level pressure block is higher than the first-level pressure block by a distance equivalent to the total height of the folded and covered structure. When the lifting base is uniformly lifted upwards under power, each pressure block contacts the lower surface of the second panel from the inside out, applying an upward bending force to it in a progressive manner. Because the effective height of each pressure block increases in a stepwise manner, the extended edge of the second panel is not suddenly bent at a certain point, but is gradually lifted in stages along the width direction, eventually smoothly transitioning to a 90-degree upright state and fitting against the end face formed after the first panel has been cut.

[0037] In one possible implementation, the welding mechanism 7 includes a laser welding head 71 and a welding pressing unit 72. The laser welding head 71 is used to perform laser welding on the pressed joint, and the welding pressing unit 72 is arranged behind the laser welding head 71 along the conveying direction to apply mechanical pressing force to the weld area that has not yet cooled while performing laser welding.

[0038] Combined with reference Figure 3As shown, in this embodiment, the welding pressing unit 72 is positioned directly in front of the laser welding head 71 along a direction perpendicular to the conveying direction. That is, the door panel is first pressed by the welding pressing unit 72, and then welded by the laser welding head 71. The welding pressing unit 72 includes multiple pressing rollers, arranged at intervals along the conveying direction. Each pressing roller is arranged sequentially at intervals along the conveying direction of the composite door panel, with its outer circumferential surface facing the folded end face of the second panel after the flange is wrapped. A frame 1 side plate is provided on the side of the frame 1 opposite to each pressing roller. This frame 1 side plate serves as a fixed load-bearing reference surface, and its surface is in contact with the outer surface of the first panel. The row of pressing rollers and the frame 1 side plate together define a flattening space extending along the door panel conveying direction. The width of this flattening space is slightly smaller than the theoretical thickness from the folded end face of the second panel after flange wrapping to the end face formed after the first panel is cut. Each pressing roller is mounted on a roller bracket via an elastic pre-tightening mechanism, which can apply an adjustable elastic pressing force towards the side plate of frame 1. During actual operation, the edge of the door panel after being folded and wrapped enters the flattening space. The side plate of frame 1 abuts against the outer surface of the first panel for support. Under the action of the elastic pre-tightening force, a row of pressing rollers presses the folded end face of the second panel against the end face formed after the first panel has been cut, thus forcibly pressing the wrapped edge of the second panel against the end face formed after the first panel has been cut, effectively eliminating bending springback. Multiple pressing rollers arranged at intervals along the conveying direction form continuous multi-point rolling pressure on the folded end face. The door panel moves smoothly forward under continuous pressure and then enters below the laser welding head 71 to complete welding, thus achieving a seamless connection between pressing and welding, ensuring that the joint remains tightly fitted throughout the welding process.

[0039] In one possible implementation, the flattening mechanism 6 includes a rolling assembly 61 and a pneumatic drive assembly 62; The rolling assembly 61 includes a plurality of rolling rollers disposed in the area of ​​the composite door panel to be flattened, for fitting against the bent surface after the edge is covered; The pneumatic drive assembly 62 is driven to the rolling assembly 61 and is used to drive the rolling assembly 61 to move toward the composite door panel to apply a flattening force.

[0040] Combined with reference Figure 4 As shown, in this embodiment, the flattening mechanism 6 is disposed between the flanging and bending mechanism 5 and the welding mechanism 7. It is used to apply a flattening force to the bent area after flanging to eliminate the springback and internal stress generated during the bending process, so that the edge of the second panel is tightly pressed against the end face formed after the first panel is cut. The flattening mechanism 6 is specifically composed of two main parts: a rolling assembly 61 and a pneumatic drive assembly 62.

[0041] The rolling assembly 61 is positioned above the flattening area of ​​the frame 1. Multiple independent rolling rollers are evenly arranged along the length of the frame 1. Each rolling roller has a cylindrical structure and is made of wear-resistant tool steel or bearing steel. Each rolling roller is mounted on a mounting lug below the supporting crossbeam via an independent short shaft and rolling bearing, allowing it to rotate freely around its own axis. The multiple rolling rollers cover the entire bending and wrapping area, ensuring that the flattening force is evenly distributed across the entire edge sealing strip.

[0042] The pneumatic drive assembly 62 is located to the side or below the rolling assembly 61, serving as the power source for the rolling assembly 61. This assembly includes a common mounting base plate on which multiple compact lifting cylinders are evenly arranged along the length. The number and position of the cylinders correspond to the distribution of the rolling wheels. The piston rod end of each cylinder is connected to the load-bearing beam of the rolling assembly 61 via a connecting block or floating joint, thus forming a drive connection. Each cylinder body is equipped with a pneumatic quick-connect fitting. The quick-connect fittings of adjacent cylinders are connected in series via air supply hoses, ultimately converging into a main air supply line, which is connected to an external compressed air source and an electromagnetic reversing valve.

[0043] In actual operation, the composite door panel, after being folded and bent, enters the flattening station. The electromagnetic reversing valve is energized, and compressed air enters the rodless chambers of each lifting cylinder simultaneously via the air supply hose. Multiple cylinders, driven by uniform air pressure, lift synchronously, pushing the supporting crossbeam and the row of rolling rollers mounted above it to move smoothly. The working surfaces of each rolling roller simultaneously contact and tightly adhere to the lower surface of the second panel after folding and covering, applying a uniform and synchronized flattening force. Under this pressure, the covered edge of the second panel is further pressed against the end face formed after the first panel is cut, forcibly eliminating the residual elastic recovery in the bending area, and smoothing out minor local wrinkles under pressure. Simultaneously, because the rolling rollers can rotate freely, they do not obstruct the normal transport of the door panel during the flattening process, allowing the door panel to pass smoothly through this station under continuous pressure.

[0044] To achieve the above objectives, the present invention also provides a metal door panel bending laser edge banding process, applied to the metal door panel bending laser edge banding machine described in any of the above possible embodiments, comprising the following steps: The composite door panel to be processed is clamped and conveyed along the processing direction, so that the edge to be sealed is suspended in the air; the first panel is cut at the edge, so that it is recessed inward relative to the second panel, forming a stepped structure with the edge of the second panel extending outward. The edge of the end face formed after the first panel is cut is milled for precision machining. A shallow stress-relieving groove is machined at the root of the second panel to be bent; Fold the extended edge of the second panel upwards and cover the end face formed after the first panel has been cut through precision milling; Apply a flattening force to the bent area after the edge is wrapped; Laser welding is performed on the joint area after pressing, and mechanical flattening force is applied simultaneously behind the moving direction of the weld pool during laser welding to eliminate welding thermal deformation. The weld seam formed after welding is scraped and repaired by removing welding slag and burrs; Polish and finish the repaired weld surface.

[0045] In this embodiment, the composite door panel to be processed is clamped by the conveying and positioning device 11 and conveyed at a uniform speed along the length of the frame 1, so that the edge portion of the composite door panel to be sealed extends through the frame 1 and is suspended to the second side 13, in a suspended state for processing. Before entering the equipment, the four sides of the first and second panels of the composite door panel are in an open state without sealing, and the sidewalls of the core filler are exposed. During the conveying process, the first grooving mechanism 2 is used to vertically cut the first panel at the edge of the composite door panel, so that the edge of the first panel is recessed inward relative to the second panel by a certain distance, thereby forming a stepped structure with the edge of the second panel extending outward, providing a structural basis for subsequent edge covering. The edge milling mechanism 3 is used to mill and finish the end face edge formed after the first panel is cut. This step involves alternating arrangements of at least one first precision milling assembly 31 and multiple second precision milling assemblies 32 along the conveying direction to perform multi-stage composite milling on the cut end face. This removes cutting burrs and ensures the flatness, perpendicularity, and surface finish of the end face, enabling a tight fit when subsequently covered by the second panel. A stress-relieving shallow groove is milled on both sides of the root of the second panel to be bent using a stress groove pre-processing mechanism 4. Its function is to pre-release the internal stress of the metal at the bending root, allowing the second panel to deform smoothly along the preset weak line during subsequent bending, effectively preventing material tearing or cracking during the bending process. Finally, a flanging bending mechanism 5 folds the protruding edge of the second panel upwards and covers it onto the end face formed after the first panel has been cut following precision milling. This step employs multiple bending and pressing components 51 arranged in a stepped pattern, which are simultaneously lifted. The effective height of each bending and pressing component 51 increases from the inside out, applying a progressive linear bending force to the extended edge of the second panel, smoothly folding it 90 degrees and tightly wrapping it around the end face of the first panel, forming a regular edge-sealing structure. A flattening mechanism 6 applies a uniform flattening force to the bent area after edge sealing to eliminate elastic rebound, local wrinkles, and residual internal stress generated during bending, ensuring that the wrapped edge of the second panel is completely and firmly pressed against the end face formed after the first panel is cut, providing a flat and dense joint condition for subsequent welding. A welding mechanism 7 performs laser welding on the pressed joint area, simultaneously applying a mechanical flattening force to the welding area during laser welding. Specifically, the edge of the door panel first enters the welding pressing unit 72. A row of pressing rollers and the flattening space formed by the side plate of the frame 1 continuously apply pressure to the flanged area, ensuring that the folded end face of the second panel is tightly fitted to the outer surface of the first panel, guaranteeing a tight fit before welding. Next, the laser welding head 71 performs laser scanning welding on the pressed joint. After welding, the welding pressing device at the rear continues to apply flattening force to the still-warm weld area to eliminate localized deformation caused by welding heat input, resulting in a smooth and flat weld surface. The weld scraping mechanism 8 then scrapes and trims the weld slag and burrs formed after welding.The scraper blade moves linearly back and forth against the weld surface, physically removing welding spatter, slag, and irregular weld excess to achieve a preliminary smooth weld. The surface finishing mechanism 9 then polishes the finished weld surface. A high-speed rotating polishing wheel applies constant pressure to the weld surface for continuous grinding and polishing, removing the fine scratches left by the scraper. This ensures the surface roughness and gloss of the edge-sealing weld match the door panel, completing the edge-sealing process.

[0046] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0047] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A metal door panel bending laser edge banding machine, used for edge banding of composite door panels, the composite door panel comprising a first panel, a second panel, and a core filler located between the two, characterized in that, The metal door panel bending laser edge banding machine includes a frame with a first side and a second side. The first side is equipped with a conveying and positioning device for clamping the composite door panel and driving it to move along the length of the frame, causing the edge portion of the composite door panel to be banded to extend through the frame and overhang to the second side. On the second side of the frame, along the conveying direction of the composite door panel, the following are arranged sequentially: The first grooving mechanism is used to cut the edge of the first panel inward relative to the second panel at the edge of the composite door panel to form a stepped structure with the edge of the second panel extending outward. An edge milling mechanism is used to perform milling and finishing on the end face edge formed after the first panel is cut; A stress groove pre-processing mechanism is used to process shallow stress relief grooves at the root of the second panel to be bent; A folding and bending mechanism is used to fold the extended edge of the second panel upwards and cover the end face of the first panel; A flattening mechanism is used to apply a flattening force to the bent area after the flange is wrapped. A welding mechanism used to perform laser welding on the pressed joints.

2. The metal door panel bending laser edge banding machine according to claim 1, characterized in that, Behind the welding mechanism along the conveying direction, the following are also arranged in sequence: Weld seam scraping mechanism, used to scrape off weld slag and burrs produced after welding; The surface finishing mechanism is used to polish the surface of the weld after scraping.

3. The metal door panel bending laser edge banding machine according to claim 1, characterized in that, The edge milling mechanism includes at least one first milling component and multiple second milling components. The first milling component and the second milling components are arranged alternately along the conveying direction of the composite door panel, and the edge of the composite door panel to be processed is alternately passed through the second milling component and the first milling component to perform multi-level composite milling processing.

4. The metal door panel bending laser edge banding machine according to claim 3, characterized in that, The second precision milling assembly includes: The first drive motor has a milling cutter mounted on its output end; The clamping roller assembly is used to maintain a stable fit between the machined surfaces during milling. A omnidirectional adjustable air duct is located on the side of the milling cutter to blow away metal chips in real time during the machining process.

5. The metal door panel bending laser edge banding machine according to claim 4, characterized in that, The first precision milling assembly includes: The second drive motor has a precision milled saw blade installed at its output end; A dust extraction hood is installed over the outside of the precision milling saw blade and has an air inlet for connecting an external dust extraction device.

6. The metal door panel bending laser edge banding machine according to claim 1, characterized in that, The flange bending mechanism includes multiple bending pressure members arranged in a stepped manner, with the effective height of each bending pressure member increasing in the direction away from the main body of the composite door panel.

7. The metal door panel bending laser edge banding machine according to claim 1, characterized in that, The welding mechanism includes a laser welding head and a welding pressing unit. The laser welding head is used to perform laser welding on the pressed joint. The welding pressing unit is located behind the laser welding head along the conveying direction and is used to apply mechanical pressing force to the weld area that has not yet cooled while performing laser welding.

8. The metal door panel bending laser edge banding machine according to claim 1, characterized in that, The flattening mechanism includes a rolling assembly and a pneumatic drive assembly; The rolling assembly includes multiple rolling rollers disposed in the area of ​​the composite door panel to be flattened, for fitting against the bent surface after the edge is covered; The pneumatic drive assembly is driven by the rolling assembly and is used to drive the rolling assembly to move toward the composite door panel to apply a flattening force.

9. A metal door panel bending laser edge banding process, applied to the metal door panel bending laser edge banding machine as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The composite door panel to be processed is clamped and conveyed along the processing direction, so that the edge to be sealed is suspended in the air; the first panel is cut at the edge, so that it is recessed inward relative to the second panel, forming a stepped structure with the edge of the second panel extending outward. The edge of the end face formed after the first panel is cut is milled for precision machining. A shallow stress-relieving groove is machined at the root of the second panel to be bent; Fold the extended edge of the second panel upwards and cover the end face formed after the first panel has been cut through precision milling; Apply a flattening force to the bent area after the edge is wrapped; Laser welding is performed on the joint area after pressing, and mechanical flattening force is applied simultaneously behind the moving direction of the weld pool during laser welding to eliminate welding thermal deformation. The weld seam formed after welding is scraped and repaired by removing welding slag and burrs; Polish and finish the repaired weld surface.

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