Window frame shape righting method for automobile door laser welding process

Abstract

The invention belongs to the technical field of laser welding, and particularly relates to a window frame shape righting method for an automobile door laser welding process. Three shape righting units are arranged on a window frame part of a door assembly pressing station; the vehicle door assembly is placed on a vehicle door assembly pressing station, so that the vehicle door assembly is aligned with the tire mold; the vehicle door inner plate is fixed, and then the window frame area is finely adjusted to be located between a supporting block and a pressing block of the shape correcting unit; throttle valves and pressure gauges are arranged on air source connecting pipes of the jacking air cylinder and the pressing air cylinder, when the pressure gauges on the jacking air cylinder and the pressing air cylinder display preset pressure values, the pressure is maintained, and the jacking air cylinder and the pressing air cylinder are controlled to release the pressure gradually; detecting the shape righting effect of the window frame area by using a high-precision tool until the shape righting requirement of the window frame is met; according to the method, the window frame part subjected to laser welding can be effectively corrected in an overpressure and pressure maintaining mode, and deformation caused by welding is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding, and in particular relates to a window frame correction method of a car door by laser welding. Background Art

[0002] In the field of modern automobile manufacturing, laser welding technology is widely used in the connection of body structural parts due to its high efficiency, energy saving and environmental protection. Especially in the manufacture of car doors, laser welding not only improves the welding speed and strength, but also reduces material consumption. However, a challenge that comes with it is the thermal deformation generated during the welding process.

[0003] During the laser welding process, local high temperatures will cause thermal expansion of the material. If the material shrinks unevenly during cooling, welding deformation is likely to occur. This is especially true for the door and window frames, which have high precision requirements. Deformation directly affects the sealing, aesthetics, and overall performance of the door. Therefore, it is particularly important to explore an efficient and accurate window frame correction method.

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

[0005] In order to overcome the above problems, the present invention provides a window frame correction method for a car door laser welding process; a cylinder is arranged at the window frame part of the pressing station of the door assembly, and when the door assembly is placed on the pressing station and clamped, the cylinder over-presses and clamps the window frame part, so that the window frame area is maintained for 1 minute, and then the pressure is slowly released; through the over-pressure and pressure-maintaining methods, the window frame part after laser welding can be effectively corrected to eliminate the deformation caused by welding.

[0006] A window frame correction method for a car door laser welding process, comprising the following contents:

[0007] Step 1: Precise positioning and preliminary stabilization: three orthopedic units are set at the window frame of the door assembly pressing station;

[0008] Step 1.1, environment and equipment preparation: ensure that there is no debris in the door assembly pressing station, the correction unit is normal, and check the lifting cylinder 2 and the pressing cylinder 1 in the correction unit to ensure that they can work normally;

[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 fetal membrane, and ensure that the door outer panel is bonded with the fetal membrane;

[0010] Step 1.3, initial positioning of the inner panel and alignment with the window frame: fix the inner door panel, 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 correction unit;

[0011] Step 2: Dynamic pressure control and correction

[0012] 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 correction pressure is appropriate;

[0013] Step 3: Pressure maintenance and shape monitoring: When the pressure gauges on the lifting cylinder 2 and the pressing cylinder 1 both show that they have reached the preset pressure value, maintain the pressure value for 1 minute;

[0014] Step 4: Pressure release and final calibration

[0015] Step 4.1, gradual release strategy: after the pressure maintenance is completed, the lifting cylinder 2 and the pressing cylinder 1 are controlled to gradually release the pressure so that the telescopic ends are gradually retracted;

[0016] Step 4.2, final inspection and optimization: Use high-precision tools to inspect the correction effect of the window frame area. If there is a slight deviation, repeat steps 1 to 4, and correct it again by adjusting the pressure of the lifting cylinder 2 and the clamping cylinder 1 or the pressure holding time in step 3 until the window frame correction meets the requirements.

[0017] In the step 1, a total of three orthopedic units are provided, which are evenly distributed at the window frame positions of the door assembly pressing station.

[0018] The orthopedic unit in step one includes a lifting cylinder 2, a clamping cylinder 1, a clamping block 3, a support block 4 and a support frame 5, wherein the lifting cylinder 2 and the clamping cylinder 1 are respectively fixed on the support frame 5, the clamping block 3 is provided on the telescopic end of the clamping cylinder 1, and the support block 4 is provided on the telescopic end of the lifting cylinder 2.

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

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

[0021] In the step 1, 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 the step 2, the pressure of the lifting cylinder 2 is gradually loaded, that is, the pressure of the lifting cylinder 2 is adjusted according to the material and thickness of the window frame area and gradually increased to 10 MPa.

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

[0024] Beneficial effects of the present invention:

[0025] The present invention adopts a pneumatic drive mode and realizes efficient and accurate correction of window frame deformation by accurately controlling the overpressure and pressure-maintaining processes, thus reflecting technological innovation and process progress.

[0026] The window frame correction method of the automobile door laser welding process of the present invention realizes effective correction of the window frame by setting a cylinder at the pressing station and using overpressure and pressure holding methods. Compared with the prior art, the method of the present invention is simple to operate, low in cost, and can significantly improve the manufacturing accuracy and appearance quality of the door assembly, and has broad application prospects.

[0027] The present invention optimizes the production process and significantly improves the manufacturing quality and market competitiveness of automobile doors. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the use state of the present invention.

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

[0031] Among them: a clamping cylinder 1, a lifting cylinder 2, a clamping block 3, a supporting block 4, and a supporting frame 5. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] Example 1

[0037] A method for correcting window frames of automobile door laser welding process, such as Figure 1 As shown, including the following:

[0038] Step 1: Precise positioning and preliminary stabilization: three orthopedic units are set at the window frame of the door assembly pressing station;

[0039] Step 1.1, environment and equipment preparation: ensure that there is no debris in the door assembly pressing station, the correction unit is normal, check the lifting cylinder 2 and the pressing cylinder 1 in the correction unit to ensure that they can work normally, 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 tooling membrane to ensure that the door outer panel is bonded to the membrane;

[0041] Step 1.3, initial positioning of the inner panel and alignment with the window frame: fix the inner door panel by the main positioning clamping device, 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 correction unit;

[0042] Step 2: Dynamic pressure control and correction

[0043] Step 2.1, gradually load the pressure: adjust the pressure of the lifting cylinder 2 according to the material and thickness of the window frame area, first test in a small range, and gradually increase it to 10MPa to avoid damage; the active end of the orthopedic cylinder is below the window frame;

[0044] Step 2.2, real-time monitoring and pressure feedback: 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 correction pressure is appropriate. At the same time, the data is recorded to provide a basis for subsequent optimization;

[0045] Step 3: Pressure maintenance and shape monitoring: When the pressure gauges on the lifting cylinder 2 and the pressing cylinder 1 both show that they have reached the preset pressure value, maintain the pressure value for 1 minute, and the internal stress of the material gradually balances;

[0046] Step 4: Pressure release and final calibration

[0047] Step 4.1, gradual release strategy: after the pressure maintenance is completed, the lifting cylinder 2 and the pressing cylinder 1 are controlled to gradually release the pressure so that the telescopic ends are gradually retracted to avoid rebound;

[0048] Step 4.2, final inspection and optimization: Use high-precision tools to inspect the correction effect of the window frame area. If there is a slight deviation, repeat steps 1 to 4, and correct it again by adjusting the pressure of the lifting cylinder 2 and the clamping cylinder 1 or the pressure holding time in step 3 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 reshaped car door needs to pass a series of strict quality inspections to ensure that all indicators meet the standards.

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

[0052] In the step 1, a total of three orthopedic units are provided, which are evenly distributed at the window frame positions of the door assembly pressing station.

[0053] like Figure 2 As shown, the orthopedic unit in step one includes a lifting cylinder 2, a clamping cylinder 1, a clamping block 3, a support block 4 and a support frame 5, wherein the lifting cylinder 2 and the clamping cylinder 1 are respectively fixed on the support frame 5, the clamping block 3 is provided on the telescopic end of the clamping cylinder 1, and the support block 4 is provided on the telescopic end of the lifting cylinder 2.

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

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

[0056] In the step 1, 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 is specifically as follows: using a gap feeler gauge to measure the correction result, that is, measuring the reduction value of the gap between the window frame and the supporting surface below the window frame. The reduction reflects the correction effect.

[0058] If there is a 5mm gap between the original 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, the correction is 2mm.

[0059] Example 2

[0060] Take the door assembly of Hongqi C801 automobile as an example. First, place the door assembly on the pressing station to ensure that the window frame part corresponds to the cylinder. Then, start the cylinder to over-press the window frame part. In this embodiment, the over-pressure pressure is 10MPa. After maintaining the over-pressure state for 1 minute, slowly release the pressure of the cylinder. Through the method of the present invention, the window frame part of the door assembly of this type of automobile is effectively corrected, and the manufacturing accuracy and appearance quality of the door assembly are improved.

[0061] Use the special grippers to place the door assembly into position, aligning it with the membrane and ensuring that the outer panels fit correctly.

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

[0063] Real-time deformation tracking and real-time observation of the window frame correction progress ensures effective correction of deformation.

[0064] After the correction, the car door needs to pass a series of strict quality inspections to ensure that all indicators meet the standards. The correction results are tracked in real time, and the correction results are tested and optimized.

[0065] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope 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 further describe various possible combinations.

[0067] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for correcting window frames of automobile doors by laser welding, characterized in that: It includes the following: Step 1: Precise positioning and preliminary stabilization: three orthopedic units are set at the window frame of the door assembly pressing station; Step 1.1, environment and equipment preparation: ensure that there is no debris in the door assembly pressing station, the correction unit is normal, and check the lifting cylinder (2) and the pressing cylinder (1) in the correction 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 fetal membrane, and ensure that the door outer panel is bonded with the fetal membrane; 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 pressing block (3) of the correction unit; Step 2: Dynamic pressure control and correction 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 correction pressure is appropriate. Step 3: Pressure maintenance and shape monitoring: When the pressure gauges on the lifting cylinder (2) and the pressing cylinder (1) both show that the preset pressure value has been reached, maintain the pressure value for 1 minute; Step 4: Pressure release and final calibration Step 4.1, gradual release strategy: after the pressure maintenance is completed, the lifting cylinder (2) and the pressing cylinder (1) are controlled to gradually release the pressure so that the telescopic ends are gradually retracted; Step 4.2, final inspection and optimization: Use high-precision tools to inspect the correction effect of the window frame area. If there is a slight deviation, repeat steps 1 to 4, and correct again by adjusting the pressure of the lifting cylinder (2) and the clamping cylinder (1) or the pressure holding time in step 3 until the window frame correction meets the requirements.

2. The method for correcting window frames of automobile doors by laser welding process according to claim 1, characterized in that: In the step 1, a total of three orthopedic units are provided, which are evenly distributed at the window frame positions of the door assembly pressing station.

3. The method for correcting window frames of automobile doors by laser welding process according to claim 1, characterized in that: The orthopedic unit in step 1 comprises a lifting cylinder (2), a clamping cylinder (1), a clamping block (3), a support block (4) and a support frame (5), wherein the lifting cylinder (2) and the clamping cylinder (1) are respectively fixed on the support frame (5), a clamping block (3) is provided on the telescopic end of the clamping cylinder (1), and a support block (4) is provided on the telescopic end of the lifting cylinder (2).

4. The method for correcting window frames of automobile doors by laser welding process according to claim 3, characterized in that: A gasket is provided on the pressing block (3).

5. The method for correcting window frames of automobile doors by laser welding process according to claim 3, characterized in that: A gasket is provided on the support block (4).

6. The method for correcting window frames of automobile doors by laser welding process according to claim 3, characterized in that: In the step 1, 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 of automobile doors by laser welding process according to claim 1, characterized in that: In the second step, the pressure of the lifting cylinder (2) is gradually loaded, that is, the pressure of the lifting cylinder (2) is adjusted according to the material and thickness of the window frame area and gradually increased to 10 MPa.

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

Images