A method for correcting window frames using laser welding process for automobile doors

Abstract

This invention belongs to the field of laser welding technology, specifically relating to a method for correcting the window frame in a laser welding process for automotive doors. Three correcting units are set up at the window frame location in the door assembly pressing station. The door assembly is placed on the door assembly pressing station, aligning it with the mold. The inner door panel is fixed, and then the window frame area is finely adjusted to be positioned between the support block and the pressing block of the correcting unit. Throttling valves and pressure gauges are installed on the air source connection pipes of the lifting cylinder and the pressing cylinder. When the pressure gauges on both cylinders show that the preset pressure value has been reached, the pressure is maintained, and the pressure is gradually released. A high-precision tool is used to detect the correcting effect of the window frame area until the corrected window frame meets the requirements. This invention, through overpressure and pressure holding, can effectively correct the window frame area after laser welding, eliminating deformation caused by welding.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, specifically relating to a method for correcting window frames in a laser welding process for automobile doors. Background Technology

[0002] In modern automotive manufacturing, laser welding technology is widely used in the connection of body structural components due to its high efficiency, energy saving, and environmental friendliness, especially in door manufacturing. Laser welding not only improves welding speed and strength but also reduces material consumption. However, a challenge that arises is the thermal deformation that occurs during the welding process.

[0003] During laser welding, localized high temperatures can cause thermal expansion of the material. If the contraction is uneven during cooling, welding deformation can easily occur. This is especially problematic for precision-critical components like car door and window frames, where deformation directly impacts the door's sealing, aesthetics, and overall performance. Therefore, exploring an efficient and precise method for window frame reshaping is crucial.

[0004] However, current traditional orthopedic methods mostly rely on manual tapping or mechanical external force for correction, which is not only inefficient but also makes it difficult to guarantee accuracy and consistency. Summary of the Invention

[0005] To overcome the above problems, the present invention provides a method for correcting the window frame of an automobile door through laser welding. A cylinder is installed at the window frame part of the pressing station of the door assembly. When the door assembly is placed on the pressing station and clamped, the cylinder applies overpressure to the window frame part, holding the window frame area for 1 minute, and then slowly releasing the pressure. Through the overpressure and pressure holding method, the window frame part after laser welding can be effectively corrected, eliminating the deformation caused by welding.

[0006] A method for correcting window frames using laser welding technology on automotive doors, comprising the following:

[0007] Step 1, Precise Positioning and Initial Stabilization: Three straightening units are set at the window frame area of ​​the door assembly pressing station;

[0008] Step 1.1, Environment and Equipment Preparation: Ensure that there are no foreign objects at the door assembly pressing station and that the straightening unit is in normal working order. Inspect the lifting cylinder 2 and pressing cylinder 1 in the straightening unit to ensure that they are working properly.

[0009] Step 1.2, Door positioning and outer panel bonding: Place the door assembly on the door assembly pressing station, align the door assembly with the tire film, and ensure that the outer door panel is bonded to the tire film.

[0010] Step 1.3, initial positioning of the inner panel and alignment with the window frame: fix the inner panel of the door, and then fine-tune the window frame area so that it is located between the support block 4 and the clamping block 3 of the orthopedic unit;

[0011] Step 2, Dynamic Pressure Control and Orthopedics

[0012] A throttle valve and a pressure gauge are installed on the air source connection pipes of the lifting cylinder 2 and the pressing cylinder 1. The working pressure of the corresponding cylinder is controlled by the throttle valve, and the working pressure of the corresponding cylinder is read by the pressure gauge as the stress of the window frame area to ensure that the straightening pressure is appropriate.

[0013] Step 3, pressure holding and shape monitoring: When the pressure gauges on both the lifting cylinder 2 and the clamping cylinder 1 show that the preset pressure value has been reached, maintain this pressure value for 1 minute;

[0014] Step 4: Pressure Release and Final Verification

[0015] Step 4.1, Gradual Release Strategy: After the pressure holding period ends, control the lifting cylinder 2 and the clamping cylinder 1 to gradually release the pressure, so that their extension and retraction ends gradually retract.

[0016] Step 4.2, Final Inspection and Optimization: Use a high-precision tool to inspect the window frame area correction effect. If there is a slight deviation, repeat steps one to four. Adjust the pressure of the lifting cylinder 2 and the pressing cylinder 1 or the pressure holding time in step three to correct the window frame again until the window frame correction meets the requirements.

[0017] In step one, three orthopedic units are set up and evenly distributed at the window frame position of the door assembly pressing station.

[0018] The orthopedic unit in step one includes a lifting cylinder 2, a pressing cylinder 1, a pressing block 3, a support block 4, and a support frame 5. The lifting cylinder 2 and the pressing cylinder 1 are respectively fixed on the support frame 5. The pressing cylinder 1 has a pressing block 3 on its telescopic end, and the lifting cylinder 2 has a support block 4 on its telescopic end.

[0019] The clamping block 3 is provided with a gasket.

[0020] The support block 4 is provided with a pad.

[0021] In step one, the support frame 5 is fixed on the door assembly pressing station so that when the door assembly is placed on the door assembly pressing station, the window frame can be located between the pressing block 3 and the support block 4.

[0022] In step two, the pressure of the lifting cylinder 2 should be gradually increased, that is, the pressure of the lifting cylinder 2 should be adjusted according to the material and thickness of the window frame area, and gradually increased to 10MPa.

[0023] The step 4.2 of using a high-precision tool to detect the correction effect of the window frame area specifically involves: using a gap gauge to measure the correction result, that is, measuring the reduction value of the gap between the window frame and the supporting surface of the window frame; the amount of reduction reflects the amount of correction.

[0024] The beneficial effects of this invention are:

[0025] This invention employs a pneumatically driven method, achieving efficient and precise correction of window frame deformation through precise control of the overpressure and pressure-holding processes, demonstrating technological innovation and process advancement.

[0026] The present invention discloses a method for correcting window frames in the laser welding process of automotive doors. This method utilizes a cylinder installed at the pressing station, employing overpressure and pressure holding techniques to effectively correct the window frame. Compared with existing technologies, the method of the present invention is simple to operate, low in cost, and can significantly improve the manufacturing precision and appearance quality of the door assembly, thus possessing broad application prospects.

[0027] This invention optimizes the production process and significantly improves the manufacturing quality and market competitiveness of automobile doors. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying 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 content of the embodiments of the present invention and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram illustrating the usage state of the present invention.

[0030] Figure 2 This is a schematic diagram of the orthopedic unit of the present invention.

[0031] The components include: 1. Pressing cylinder; 2. Lifting cylinder; 3. Pressing block; 4. Support block; and 5. Support frame. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0036] Example 1

[0037] A method for correcting window frames using laser welding technology in automotive doors, such as... Figure 1 As shown, it includes the following:

[0038] Step 1, Precise Positioning and Initial Stabilization: Three straightening units are set at the window frame area of ​​the door assembly pressing station;

[0039] Step 1.1, Environment and Equipment Preparation: Ensure that there are no foreign objects at the door assembly pressing station and that the straightening unit is in normal working order. Inspect the lifting cylinder 2 and pressing cylinder 1 in the straightening unit to ensure that they are working properly and preset the pressure of each cylinder.

[0040] Step 1.2, Door positioning and outer panel bonding: The robot uses a special gripper to place the door assembly on the door assembly pressing station, so that the door assembly is aligned with the fixture mold, ensuring that the outer panel of the door is bonded to the mold.

[0041] Step 1.3, initial positioning of the inner panel and alignment with the window frame: the inner panel of the door is fixed by the main positioning clamping device, and then the window frame area is finely adjusted so that it is located between the support block 4 and the pressing block 3 of the straightening unit;

[0042] Step 2, Dynamic Pressure Control and Orthopedics

[0043] Step 2.1, Gradual Pressure Application: Adjust the pressure of the lifting cylinder 2 according to the material and thickness of the window frame area. First, test on a small scale, and gradually increase to 10MPa to avoid damage; the movable end of the orthopedic cylinder is under the window frame.

[0044] Step 2.2, Real-time monitoring and pressure feedback: Throttling valves and pressure gauges are installed on the air source connection pipes of lifting cylinder 2 and pressing cylinder 1. The working pressure of the corresponding cylinder is controlled by the throttle valve, and the working pressure of the corresponding cylinder is read by the pressure gauge as the stress of the window frame area to ensure that the straightening pressure is appropriate. At the same time, the data is recorded to provide a basis for subsequent optimization.

[0045] Step 3, Pressure Holding and Shape Monitoring: When the pressure gauges on both the lifting cylinder 2 and the clamping cylinder 1 show that the preset pressure value has been reached, maintain this pressure value for 1 minute, and the internal stress of the material will gradually become balanced.

[0046] Step 4: Pressure Release and Final Verification

[0047] Step 4.1, Gradual Release Strategy: After the pressure holding period ends, control the lifting cylinder 2 and the clamping cylinder 1 to gradually release the pressure, so that their extension and retraction ends gradually retract to avoid rebound;

[0048] Step 4.2, Final Inspection and Optimization: Use a high-precision tool to inspect the window frame area correction effect. If there is a slight deviation, repeat steps one to four. Adjust the pressure of the lifting cylinder 2 and the pressing cylinder 1 or the pressure holding time in step three to correct the window frame again until the window frame correction meets the requirements.

[0049] Step 5: Continuous Feedback and Process Optimization

[0050] Step 5.1, Quality Inspection and Data Analysis: The corrected car door needs to undergo a series of rigorous quality inspections to ensure that all indicators meet the standards.

[0051] Step 5.2, Iterative optimization mechanism: Based on data feedback from the orthopedic process, continuously adjust parameters and optimize the design of support block 4, pursue continuous improvement of the process, and continuously improve the orthopedic effect and production efficiency.

[0052] In step one, three orthopedic units are set up and evenly distributed at the window frame position of the door assembly pressing station.

[0053] like Figure 2 As shown, the orthopedic unit in step one includes a lifting cylinder 2, a pressing cylinder 1, a pressing block 3, a support block 4, and a support frame 5. The lifting cylinder 2 and the pressing cylinder 1 are respectively fixed on the support frame 5. The pressing cylinder 1 has a pressing block 3 on its telescopic end, and the lifting cylinder 2 has a support block 4 on its telescopic end.

[0054] The clamping block 3 is provided with a gasket.

[0055] The support block 4 is provided with a pad.

[0056] In step one, the support frame 5 is fixed on the door assembly pressing station so that when the door assembly is placed on the door assembly pressing station, the window frame can be located between the pressing block 3 and the support block 4.

[0057] The step 4.2 of using a high-precision tool to detect the correction effect of the window frame area specifically involves measuring the correction result with a gap gauge, that is, measuring the reduction value of the gap between the window frame and the support surface below the window frame. The amount of reduction reflects the extent of correction.

[0058] If there was originally a 5mm gap between the window frame and the supporting surface, the correction result can be verified by measuring the gap between the corrected part and the supporting surface. If the measured value is 3mm, it indicates a correction of 2mm.

[0059] Example 2

[0060] Taking the Hongqi C801 automobile door assembly as an example. First, the door assembly is placed on the pressing station, ensuring that the window frame aligns with the cylinder. Then, the cylinder is activated, applying overpressure to the window frame. In this embodiment, the overpressure pressure is 10 MPa. After maintaining the overpressure state for 1 minute, the cylinder pressure is slowly released. Through the method of this invention, the window frame of this type of automobile door assembly is effectively corrected, improving the manufacturing precision and appearance quality of the door assembly.

[0061] Use a special gripper to place the door assembly in place, align it with the tire film, and ensure that the outer panel fits correctly.

[0062] The stroke of the lifting cylinder 2 is controlled by the support block 4 and the clamping block by increasing and decreasing the shims; the stroke of the pressing cylinder 1 is controlled by the support block 4 and the clamping block by increasing and decreasing the shims.

[0063] Real-time deformation tracking allows for real-time monitoring of the window frame's correction progress, ensuring effective deformation correction.

[0064] The corrected car door must undergo a series of rigorous quality tests to ensure that all indicators meet the standards. The correction results are tracked in real time, and the results are monitored and optimized.

[0065] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any person skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention. These simple modifications are all within the scope of protection of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0067] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for correcting window frames in a laser welding process for automobile doors, characterized in that, Includes the following: Step 1, Precise Positioning and Initial Stabilization: Three straightening units are set at the window frame area of ​​the door assembly pressing station; Step 1.1, Environment and equipment preparation: Ensure that there are no foreign objects at the door assembly pressing station and that the straightening unit is in normal condition. Check the lifting cylinder (2) and pressing cylinder (1) in the straightening unit to ensure that they can work normally. Step 1.2, Door positioning and outer panel bonding: Place the door assembly on the door assembly pressing station, align the door assembly with the tire film, and ensure that the outer door panel is bonded to the tire film. Step 1.3, initial positioning of the inner panel and alignment with the window frame: fix the inner panel of the car door, and then fine-tune the window frame area so that it is located between the support block (4) and the pressing block (3) of the orthopedic unit; Step 2, Dynamic Pressure Control and Orthopedics A throttle valve and a pressure gauge are provided on the air source connection pipes of the lifting cylinder (2) and the pressing cylinder (1). The working pressure of the corresponding cylinder is controlled by the throttle valve, and the working pressure of the corresponding cylinder is read by the pressure gauge as the stress of the window frame area to ensure that the straightening pressure is appropriate. Step 3, pressure holding and shape monitoring: When the pressure gauges on both the lifting cylinder (2) and the clamping cylinder (1) show that the preset pressure value has been reached, maintain the pressure value for 1 minute; Step 4: Pressure Release and Final Verification Step 4.1, Gradual release strategy: After the pressure holding is completed, control the lifting cylinder (2) and the pressing cylinder (1) to gradually release the pressure, so that their extension and retraction ends gradually retract; Step 4.2, final inspection and optimization: Use a high-precision tool to inspect the window frame area correction effect. If there is a slight deviation, repeat steps one to four. Adjust the pressure of the lifting cylinder (2) and the pressing cylinder (1) or the pressure holding time in step three to correct the window frame again until the window frame correction meets the requirements.

2. The method for correcting window frames in a laser welding process for automobile doors according to claim 1, characterized in that, In step one, three orthopedic units are set up and evenly distributed at the window frame position of the door assembly pressing station.

3. The method for correcting window frames in a laser welding process for automobile doors according to claim 1, characterized in that, The orthopedic unit in step one includes a lifting cylinder (2), a pressing cylinder (1), a pressing block (3), a support block (4), and a support frame (5). The lifting cylinder (2) and the pressing cylinder (1) are fixed on the support frame (5). The pressing cylinder (1) has a pressing block (3) on its telescopic end, and the lifting cylinder (2) has a support block (4) on its telescopic end.

4. The method for correcting window frames in a laser welding process for automobile doors according to claim 3, characterized in that, The clamping block (3) is provided with a gasket.

5. The method for correcting window frames in a laser welding process for automobile doors according to claim 3, characterized in that, The support block (4) is provided with a gasket.

6. The method for correcting window frames in a laser welding process for automobile doors according to claim 3, characterized in that, In step one, the support frame (5) is fixed on the door assembly pressing station so that when the door assembly is placed on the door assembly pressing station, the window frame can be located between the pressing block (3) and the support block (4).

7. The method for correcting window frames in a laser welding process for automobile doors according to claim 1, characterized in that, In step two, the pressure of the lifting cylinder (2) should be gradually increased, that is, the pressure of the lifting cylinder (2) should be adjusted according to the material and thickness of the window frame area, and gradually increased to 10MPa.

8. The method for correcting window frames in a laser welding process for automobile doors according to claim 1, characterized in that, The step 4.2 of using a high-precision tool to detect the correction effect of the window frame area specifically involves: using a gap gauge to measure the correction result, that is, measuring the reduction value of the gap between the window frame and the supporting surface of the window frame; the amount of reduction reflects the amount of correction.

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