Laser welding method and system for non-uniform cross-section thin plates with guiding function

Abstract

The present invention provides a method and system for laser welding of thin plates with non-uniform cross-sections with a guiding function, the method comprising the following steps: laser welding thin plates of different thicknesses into an upper frame welding assembly and a lower frame welding assembly; integrally stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly; guiding and positioning the frame welding assembly on the vehicle body through a bushing with a large upper portion and a small lower portion with a guide; simulating and verifying various aspects of the performance of the frame welding assembly to obtain simulation verification results; obtaining the optimized size of each thin plate based on the obtained simulation verification results. The present application uses thin plates of different thicknesses for welding to achieve the optimal design of the frame weight and performance; by laser welding thin plates and then integrally stamping and forming, the welding quality of the frame is ensured, while reducing component data, welding processes and costs; the frame is guided and positioned on the vehicle body to effectively improve the installation and positioning accuracy of the frame.

Description

Technical Field

[0001] The invention relates to the technical field of automobile frames, and in particular to a laser welding method and system for non-uniform cross-section thin plates with a guiding function. Background Art

[0002] As vehicle driving energy consumption requirements continue to decrease, the requirements for lightweight automotive parts are becoming increasingly higher. When the modal and stiffness standards are met, different plate thicknesses are used to stamp and weld the frame.

[0003] Stamped frames are usually formed by stamping each sheet, and then welded by overlapping spot welding or seam welding. There are the following technical problems:

[0004] 1) The plates in the welding area overlap, resulting in increased weight; after stamping, the matching degree of the welding surfaces of the two plates is difficult to ensure, which can easily lead to a series of problems such as poor welding quality and cracking in the welding area.

[0005] 2) At present, the general frame structure has no self-guiding function and body assembly. During assembly, auxiliary tooling is required to first position the frame, and then use the auxiliary tooling and body positioning to finally achieve the purpose of positioning and installing the frame and body.

[0006] 3) The frame fixing point uses a single bushing. In order to ensure a larger pressing force, a large diameter bushing is required, resulting in a larger weight of the bushing and frame sleeve.

[0007] 4) The comprehensive performance evaluation of the vehicle frame’s NVH performance, stiffness performance, strength performance, durability performance, and collision safety performance is insufficient, and design redundancy cannot be comprehensively identified. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to provide a method and system for laser welding of thin plates with non-uniform cross-sections with a guiding function.

[0009] In a first aspect, the present application provides a method for laser welding of thin plates of non-uniform cross-section with a guiding function, comprising the following steps:

[0010] Step S1, laser welding thin plates of different thicknesses into an upper frame welding assembly and a lower frame welding assembly;

[0011] Step S2, integrally stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0012] Step S3, positioning and installing the frame welding assembly on the vehicle body through the upper large and lower small guide bushings;

[0013] Step S4, verifying various aspects of the performance of the frame welding assembly by simulation, and obtaining simulation verification results;

[0014] Step S5: Obtain the optimized size of each thin plate according to the obtained simulation verification results.

[0015] According to the first aspect, in a first possible implementation manner of the first aspect, step S1 specifically includes the following steps:

[0016] Step S11, obtaining the size range of the thin plates of each component of the frame;

[0017] Step S12, selecting thin plates of different thicknesses within a size range according to the frame composition, pre-assembling the frame according to the frame composition and aligning the end faces of adjacent thin plates;

[0018] Step S13, pre-assembling and aligning the different thicknesses of the end faces of adjacent thin plates by laser welding to form an upper frame welding assembly and a lower frame welding assembly.

[0019] According to the first aspect, in a second possible implementation manner of the first aspect, step S2 specifically includes the following steps:

[0020] Step S21, aligning the upper welding assembly of the frame and the lower welding assembly of the frame;

[0021] Step S22, integrally stamping the aligned upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0022] Step S23, seam welding the edges of the upper frame welding assembly and the lower frame welding assembly of the frame welding assembly;

[0023] Step S24, installing a bushing sleeve in the bushing hole of the frame welding assembly, and seam welding the bushing sleeve to the bushing hole;

[0024] Step S25, pressing the upper bushing with guide and the lower bushing with guide into the bushing sleeve from top to bottom.

[0025] According to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, step S3 specifically includes the following steps:

[0026] Step S30, the auxiliary tooling is positioned and welded to the frame assembly, and then bolts are passed through the upper large and lower small bushings with guides to position and install them on the mounting holes of the vehicle body.

[0027] According to the first aspect, in a fourth possible implementation manner of the first aspect, step S4 specifically includes the following steps:

[0028] Step S41, dividing the frame welding assembly into a plurality of grids;

[0029] Step S42, simulating and verifying various performances of the frame, and obtaining simulation verification results;

[0030] Step S43, evaluating whether the performance requirements of each grid of the frame welding assembly are met according to the obtained simulation verification results;

[0031] Step S44, according to whether the performance requirements of each grid of the frame welding assembly are met, different thin plate correction methods for each grid of the frame welding assembly are executed until the performance of each grid of the frame welding assembly meets the requirements, and the sizes of each thin plate when the performance of each grid of the frame welding assembly meets the requirements are obtained.

[0032] According to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, step S5 specifically includes the following steps:

[0033] According to the obtained thin plate sizes when the performance of each grid of the frame welding assembly meets the requirements, multidisciplinary optimization analysis and finite element solution calculation are carried out to obtain the optimal material thickness size of each thin plate of the frame based on the conditions that various performances meet the requirements.

[0034] According to the fifth implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, after step S5, the following steps are further included:

[0035] Step S6: adjusting the frame thin plate processing mold according to the obtained optimal material thickness size of each frame thin plate based on various performance conditions.

[0036] In a second aspect, the present application provides a method for laser welding of thin plates of non-uniform cross-section with a guiding function, comprising:

[0037] Laser welding module, used for laser welding thin plates of different thicknesses into upper frame welding assembly and lower frame welding assembly;

[0038] A stamping module is connected to the laser welding module for stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0039] A positioning and installation module is connected to the stamping module for positioning and installing the frame welding assembly on the vehicle body through a bushing guide with a large upper part and a small lower part;

[0040] A simulation verification module, which is in communication with the positioning and installation module and is used to simulate and verify various aspects of the performance of the frame welding assembly and obtain simulation verification results;

[0041] The optimized size acquisition module is connected to the simulation verification module for obtaining the optimized size of each thin plate according to the obtained simulation verification results.

[0042] According to the second aspect, in a first possible implementation manner of the second aspect, the laser welding module includes:

[0043] A size range acquisition unit, used to acquire the size range of the thin plates of each component of the frame;

[0044] A pre-assembly and alignment unit is connected to the size range acquisition unit for selecting thin plates of different thicknesses within a size range according to the frame composition, and pre-assembling the frame according to the frame composition and aligning the end faces of adjacent thin plates;

[0045] The laser welding unit is connected to the pre-assembly and alignment unit for laser welding to pre-assemble and align adjacent thin plate end surfaces of different thicknesses into a vehicle frame upper welding assembly and a vehicle frame lower welding assembly.

[0046] According to the second aspect, in a second possible implementation manner of the second aspect, the stamping module includes:

[0047] An alignment unit, which is in communication with the laser welding module and is used to align the upper welding assembly of the vehicle frame and the lower welding assembly of the vehicle frame;

[0048] A stamping unit, which is in communication with the alignment unit and is used to integrally stamp the aligned upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0049] An edge seam welding unit is connected in communication with the stamping unit and is used for seam welding the frame welding assembly and the lower frame welding assembly and the edge;

[0050] A sleeve seam welding unit is connected to the stamping unit for installing a sleeve in a sleeve hole of the frame welding assembly and seam welding the sleeve into the sleeve hole;

[0051] The upper and lower bushing pressing units are connected to the edge seam welding unit and the sleeve seam welding unit for pressing the upper bushing with guide and the lower bushing with guide into the bushing sleeve.

[0052] The present application processes a frame welding assembly by welding thin plates of different thicknesses into an upper frame welding assembly and a lower frame welding assembly. Compared with the prior art of processing a frame into a frame with thin plates of equal thickness, the lightweight design of the frame is achieved through flexible setting of material thickness; the upper frame welding assembly and the lower frame welding assembly are first formed by welding, and then the upper frame welding assembly and the lower frame welding assembly are integrally stamped into the frame welding assembly. The edges of the stamped upper frame welding assembly and the edges of the lower frame welding assembly are aligned, with a high degree of matching, effectively ensuring the welding quality, and there is no overlap of the plates in the welding area during welding, thereby avoiding the overlap of the plates to increase the weight of the frame; the thin plates are laser welded and then stamped into one piece, thereby ensuring the welding quality of the frame, while reducing the data of parts, reducing the welding process and reducing the cost; the frame welding assembly is guided and installed on the vehicle body, effectively ensuring the installation and positioning accuracy of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a method flow chart of the laser welding method of non-uniform cross-section thin plates with a guiding function provided by the present application;

[0054] Figure 2 It is the frame welding assembly drawing;

[0055] Figure 3 This is the bushing and frame welding assembly diagram;

[0056] Figure 4 It is an exploded view of the frame welding assembly;

[0057] Figure 5 It is a schematic diagram of the welding positioning of each thin plate of the welding assembly on the frame;

[0058] Figure 6 This is a detailed picture of the laser welding of the thin plates of the lower frame welding assembly;

[0059] Figure 7 This is the detail diagram of the splicing and positioning on the left side of the frame;

[0060] Figure 8 This is the detail diagram of the splicing and positioning on the right side of the frame;

[0061] Fig. 9 This is the welding assembly drawing on the frame;

[0062] Fig.10 This is the frame guide bushing assembly diagram;

[0063] Fig.11 is a cross-sectional view of a frame guide bushing assembly;

[0064] Fig.12 This is a functional module block diagram of the non-uniform cross-section laser welding system with guiding function provided in this application.

[0065] In the figure, 1, welding assembly of frame with bushing; 2, first lower bushing with guide; 3, first upper bushing with guide; 4, welding assembly of frame; 5, second upper bushing with guide; 51, inner guide tube of bushing assembly; 52, rubber body of bushing assembly; 53, outer guide tube of bushing assembly; 6, lower bushing with guide; 7, upper bushing with guide; 8, lower bushing with guide; 9, upper bushing with guide; 10, lower bushing with guide; 11, first bushing sleeve; 12, second bushing sleeve; 13, third bushing sleeve; 14, fourth bushing sleeve; 15, welding assembly on frame; 16, welding assembly on frame; 17, upper left longitudinal beam of frame; 171, front positioning hole of welding upper left longitudinal beam of frame; 172 , positioning hole after welding of the upper left longitudinal beam of the frame; 18, upper front cross beam of the frame; 181, left positioning hole of the upper front cross beam of the frame; 182. Right positioning hole of the upper front cross beam of the frame; 19, upper right longitudinal beam of the frame; 191, positioning hole before welding of the upper right longitudinal beam of the frame; 192, positioning hole after welding of the upper right longitudinal beam of the frame; 20, upper rear cross beam of the frame; 201, left positioning hole of the upper rear cross beam of the frame; 202, right positioning hole of the upper rear cross beam of the frame; 21, first laser welding seam; 22, second laser welding seam; 23, third laser welding seam; 24, fourth laser welding seam; 100, laser welding module; 200, stamping module; 300, positioning and installation module; 400, simulation verification module; 500, optimized size acquisition module. DETAILED DESCRIPTION

[0066] Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Although the present invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the present invention to the embodiments described. On the contrary, it is intended to cover changes, modifications and equivalents included in the spirit and scope of the present invention as defined by the appended claims. It should be noted that the method steps described herein can all be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of the two.

[0067] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0068] Note: The example to be introduced below is only a specific example, and is not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can apply the concept of the present invention to construct more embodiments not mentioned in this specification by reading this specification.

[0069] As the requirements for vehicle driving energy consumption continue to decrease, the requirements for lightweight automotive parts are becoming increasingly higher. Under the condition that the modal and stiffness standards are met, the upper frame and the lower frame are stamped and welded using steel plates of different thicknesses, and then the upper frame and the lower frame are welded using spot welding or seam welding. However, this frame processing method results in overlapping plates in the welding area, resulting in increased weight; poor welding quality; poor frame installation positioning accuracy, and design redundancy in steel plate thickness, which cannot meet the lightweight design requirements for automotive parts.

[0070] In view of this, please refer to Figure 1 The present application provides a method for laser welding thin plates with non-uniform cross-sections with a guiding function, comprising the following steps:

[0071] Step S1, laser welding thin plates of different thicknesses into an upper frame welding assembly and a lower frame welding assembly;

[0072] Step S2, integrally stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0073] Step S3, positioning and installing the frame welding assembly on the vehicle body through the upper large and lower small guide bushings;

[0074] Step S4, verifying various aspects of the performance of the frame welding assembly by simulation, and obtaining simulation verification results;

[0075] Step S5: Obtain the optimized size of each thin plate according to the obtained simulation verification results.

[0076] The present application processes a frame welding assembly by welding thin plates of different thicknesses into an upper frame welding assembly and a lower frame welding assembly. Compared with the prior art of processing a frame into a frame using thin plates of equal thickness, a lightweight design of the frame is achieved through flexible setting of material thickness. The upper frame welding assembly and the lower frame welding assembly are first formed by welding, and then the upper frame welding assembly and the lower frame welding assembly are integrally stamped into the frame welding assembly. The edges of the stamped upper frame welding assembly and the edges of the lower frame welding assembly are aligned, with a high degree of matching, effectively ensuring the welding quality. There is no overlap of the plates in the welding area during seam welding, thereby avoiding overlapping of the plates to increase the weight of the frame. The frame welding assembly is guided and installed on the vehicle body, effectively ensuring the installation and positioning accuracy of the frame.

[0077] In one embodiment, the step S1 specifically includes the following steps:

[0078] Step S11, obtaining the size range of the thin plates of each component of the frame, wherein the size range of the thin plates of each component of the frame can be obtained in a manner given by a material supplier, or can be obtained according to factory processing experience;

[0079] Step S12, selecting thin plates of different thicknesses within a size range according to the frame composition, pre-assembling the frame according to the frame composition and aligning the end faces of adjacent thin plates;

[0080] Step S13, pre-assembling and aligning the different thicknesses of the end faces of adjacent thin plates by laser welding to form an upper frame welding assembly and a lower frame welding assembly.

[0081] In one embodiment, if Figure 4 As shown, the frame component, i.e., the frame welding assembly component, includes an upper frame welding assembly 15 and a lower frame welding assembly 16, and the first bushing sleeve 11, the second bushing sleeve 12, the third bushing sleeve 13, and the fourth bushing sleeve 14 are respectively arranged in the corresponding bushing holes; Figure 5 As shown, the upper frame welding assembly 15 and the lower frame welding assembly 16 both include a left upper frame beam 17 , a front upper frame cross beam 18 , a right upper frame longitudinal beam 19 , and a rear upper frame cross beam 20 .

[0082] In a more specific embodiment, the size range of the frame left upper beam thin plate and the frame right upper longitudinal beam thin plate is 1.0-5.0 mm, and the size range of the frame front upper cross beam thin plate and the frame rear upper cross beam thin plate is 1.5 mm-4.0 mm.

[0083] In a more specific embodiment, the size of the frame left upper beam thin plate and the frame right upper longitudinal beam is 3.0 mm, and the size of the frame front upper cross beam and the frame rear upper cross beam thin plate is 1.8 mm.

[0084] In one embodiment, in step S12, positioning holes are respectively set on each thin plate of the upper frame welding assembly 15 or the lower frame welding assembly 16, and each thin plate includes an upper longitudinal beam of the frame, a front upper cross beam of the frame, a right upper longitudinal beam of the frame, and a rear upper cross beam of the frame. Figure 5 As shown, the positioning holes include a positioning hole 171 before welding the left upper longitudinal beam of the frame, a positioning hole 172 after welding the left upper longitudinal beam of the frame, a left positioning hole 181 of the front upper crossbeam of the frame, a right positioning hole 182 of the front upper crossbeam of the frame, a positioning hole 191 before welding the right upper longitudinal beam of the frame, a positioning hole 192 after welding the right upper longitudinal beam of the frame, a left positioning hole 201 of the rear upper crossbeam of the frame, and a right positioning hole 202 of the rear upper crossbeam of the frame. The positioning holes are used to pre-assemble the frame according to the frame composition and align the end faces of adjacent thin plates. Among them, the positioning holes after welding can also realize the alignment between the upper welding assembly of the frame and the lower welding assembly of the frame. A plurality of the positioning holes are formed by processing each thin plate in the frame thin plate processing mold.

[0085] like Figure 6 As shown, the first laser welding seam 21, the second laser welding seam 22, the third laser welding seam 23 and the fourth laser welding seam 24 in the laser splicing details of the welding assembly thin plates on the frame.

[0086] Use the positioning holes to align the ends of the thin plates, including: 1. Welding assembly on the frame, thin plates of different thicknesses, side alignment and lower plane alignment, see Figure 7-8 As shown; 2. Welding assembly under the frame, thin plates of different thicknesses, side alignment and upper plane alignment; see Figure 7-8 As shown; 3. The purpose of aligning the lower plane of the upper welding assembly and the upper plane of the lower welding assembly is to make the upper and lower welding assemblies fit completely without height difference and facilitate welding. Figure 7 , after positioning on the right, details B1 or B2, such as Figure 8 ,use Figure 6 Welding assembly, the welding assembly on the frame after stamping and trimming 15, such as Fig. 9 shown.

[0087] In one embodiment, the step S2 specifically includes the following steps:

[0088] Step S21, aligning the upper welding assembly of the frame and the lower welding assembly of the frame;

[0089] Step S22, integrally stamping the aligned upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0090] Step S23, the weld position is at the edge of the upper frame welding assembly and the lower frame welding assembly of the frame welding assembly. Since the upper frame welding assembly and the lower frame welding assembly are integrally stamped, the edges of the two are aligned. After the edges of the two are seam-welded, there is no overlap of the welding area, and the welding quality is good.

[0091] Step S24, installing a bushing sleeve in the bushing hole of the frame welding assembly, and seam welding the bushing sleeve to the bushing hole;

[0092] Step S25, pressing an upper bushing with a guide and a lower bushing with a guide into the bushing sleeve from top to bottom, and pressing the small diameter ends of the upper bushing with a guide and the lower bushing with a guide into the bushing sleeve.

[0093] In one embodiment, the step S21 is implemented by vertically aligning the upper welding assembly of the frame and the lower welding assembly of the frame through positioning holes of each thin plate or positioning holes after welding, so as to facilitate integral stamping into the frame.

[0094] In one embodiment, the alignment of the upper frame welding assembly and the lower frame welding assembly is achieved by: aligning the upper frame welding assembly and the lower frame welding assembly according to the frame composition, for example, the upper left longitudinal beam of the upper frame welding assembly corresponds to the upper left longitudinal beam of the lower frame welding assembly, the upper frame welding assembly and the lower frame welding assembly are arranged in such a way that the front upper cross beam of the upper frame welding assembly corresponds to the front upper cross beam of the lower frame welding assembly, and the upper right longitudinal beam of the upper frame welding assembly corresponds to the upper right longitudinal beam of the lower frame welding assembly.

[0095] In a more specific embodiment, in step S25, Fig.10 and Fig.11 As shown, the upper bushing with guide and the lower bushing with guide are both non-straight-tube structures, with a large diameter at one proximal end and a small diameter at the other proximal end. Both of them include a bushing assembly guide inner tube 51, a bushing assembly rubber body 52 and a bushing assembly guide outer tube 53. The diameter of the bushing assembly guide inner tube 51 is smaller than the diameter of the bushing assembly guide outer tube 53. The bushing assembly guide outer tube 53 is used to be pressed into the bushing sleeve. By setting the upper bushing with guide and the lower bushing with guide, both of which are non-straight-tube designs, compared with the bushings with straight-tube designs, the weight of the frame is further reduced, and the effect of a gasket is played. At the same time, the guide function of the frame being installed on the body is realized. The bolts pass through the hollow holes of the upper and lower bushings and are screwed to the body. Compared with the original bushing holes with larger diameters, the screwing direction of the bolts is more effectively guaranteed, and the positioning and installation accuracy of the frame is effectively guaranteed.

[0096] In one embodiment, the step S3 specifically includes the following steps:

[0097] Step S30, the auxiliary tooling is positioned and welded to the frame assembly, and then bolts are passed through the upper large and lower small bushings with guides to position and install them on the mounting holes of the vehicle body.

[0098] In a more specific embodiment, Figure 3 As shown, the upper large and lower small guide bushing is a guide upper bushing or a guide lower bushing. Specifically, the frame welding assembly of the present application needs to use multiple upper large and lower small guide bushings, including a first guide upper bushing 3, a first guide lower bushing 2, a second guide upper bushing 5, a second guide lower bushing 6, a third guide upper bushing 7, a third guide lower bushing 8, a fourth guide upper bushing 9, and a fourth guide lower bushing 10, which are respectively pressed into the bushing holes of the frame welding assembly 4 from top to bottom to form a structure as shown in FIG. Figure 2 The welding assembly 1 of the vehicle frame with bushing is shown.

[0099] In one embodiment, the step S4 specifically includes the following steps:

[0100] Step S41, dividing the frame welding assembly into multiple grids, and checking the grid quality to form a finite element model. In the finite element model, various parameters such as material and working condition solution are set for the finite element grid assembly of the frame, including various simulation performance verifications;

[0101] Step S42, verifying various performances of the frame by simulation, and obtaining simulation verification results, wherein the various performances of the frame include NVH performance, stiffness performance, strength performance, durability performance, and collision safety performance, etc. Specifically, the various performances of the frame include modal performance, stiffness performance, strength performance, and fatigue performance, wherein the simulation index corresponding to the modal performance is the modal frequency value, the simulation index corresponding to the stiffness performance is the deformation, the simulation index corresponding to the strength performance is the stress value, and the simulation index corresponding to the fatigue performance is the damage value;

[0102] Step S43, based on the obtained simulation verification results, evaluate whether the performance requirements of each grid of the frame welding assembly are met; for example, based on the obtained modal frequency value, determine whether the modal performance of the frame verified by simulation meets the requirements, based on the deformation, determine whether the stiffness performance of the frame verified by simulation meets the requirements, based on the stress value obtained by the frame simulation verification, determine whether the strength performance of the frame verified by simulation meets the requirements, and based on the damage value, determine whether the fatigue performance of the frame meets the requirements; more specifically, when the damage value exceeds the upper limit of the damage value, determine that the fatigue performance of the frame verified by simulation does not meet the requirements, and when the damage value is between the upper limit of the loss value and the lower limit of the damage value, determine that the fatigue performance of the frame verified by simulation meets the requirements;

[0103] Step S44: according to whether the performance requirements of each mesh of the frame welding assembly are met, different thin plate correction methods of each mesh of the frame welding assembly are executed until the performance of each mesh of the frame welding assembly meets the requirements, and the sizes of each thin plate when the performance of each mesh of the frame welding assembly meets the requirements are obtained. After simulation verification of each performance of the frame, the size range of each thin plate of the frame under the premise of meeting each performance is obtained. Compared with the size range of the thin plates of each component of the frame in step S11, this range is smaller;

[0104] In one embodiment, the step S5 specifically includes the following steps:

[0105] According to the obtained range of sizes of each thin plate when the performance of each grid of the frame welding assembly meets the requirements, multidisciplinary optimization analysis and finite element solution calculation are carried out to obtain the optimal material thickness size of each thin plate of the frame based on the condition that all performances are met.

[0106] In a more specific embodiment, the specific steps of simulation verification of the frame are as follows:

[0107] Step 1: First, divide the frame welding assembly into finite element meshes and check the mesh quality.

[0108] Step 2: In the finite element model, set the parameters of the frame finite element mesh assembly, including material and working condition solutions, including simulation performance verification.

[0109] Step 3: Vehicle frame simulation verification includes all aspects of the comprehensive performance of the vehicle frame. Specifically, it includes modal performance, the corresponding simulation indicators are modal frequency value and stiffness performance, the corresponding simulation indicators are deformation and strength performance, the corresponding simulation indicators are stress value and fatigue performance, and the corresponding simulation indicator is damage value.

[0110] Step 4: Conduct a comprehensive evaluation based on the performance of each dimension. If the evaluation results do not meet the requirements, it is necessary to re-analyze and correct the relevant thin plate dimensions and re-simulate and verify. Once the performance meets the requirements, the next step can be carried out.

[0111] Step 5: Organize the performance tables of each dimension after evaluation, set the size variables for each thin plate, give a reasonable size range, and design the performance indicators in step 3.

[0112] Step 6. According to the size range set by the performance index shown in step 5, use the multidisciplinary optimization simulation software Hyperstudy to perform multidisciplinary optimization analysis and finite element solution calculation to obtain the optimized material thickness size of the frame sheet based on the conditions of satisfying various performances. For example, when the size range of the sheet in step 5 is between 3.0-3.5mm, set the size variables in Hyperstudy, set the frame modal frequency, deformation, maximum stress value, and maximum fatigue damage value as responses, set the minimum mass and maximum fatigue damage value as targets, set the constraints to the maximum stress value lower than the material yield, the deformation and modal frequency values ​​lower than the required values, and perform multivariable and multi-objective optimization on the subframe. After optimization, it is concluded that after the frame meets various performance indicators, the plate thickness size of the appropriate material frame can be selected within the given range of 3.0-3.5, the design redundancy can be identified, and the subsequent frame mold can be appropriately adjusted. The thickness of the frame sheet metal can be optimally defined to eliminate design redundancy.

[0113] In one embodiment, after step S5, the following steps are further included:

[0114] Step S6: adjusting the frame thin plate processing mold according to the obtained optimal material thickness size of each frame thin plate based on various performance conditions.

[0115] Based on the same invention concept, please refer to Fig.12 The present application provides a method for laser welding of thin plates with non-uniform cross-sections with a guiding function, comprising:

[0116] The laser welding module 100 is used for laser welding thin plates of different thicknesses into an upper welding assembly and a lower welding assembly of a vehicle frame;

[0117] The stamping module 200 is in communication with the laser welding module 100 and is used for stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0118] A positioning and installation module 300 is connected to the stamping module 200 and is used to position and install the frame welding assembly on the vehicle body through a bushing guide with a large upper part and a small lower part;

[0119] The simulation verification module 400 is connected to the positioning and installation module 300 for simulating and verifying various aspects of the performance of the frame welding assembly and obtaining simulation verification results;

[0120] The optimized size acquisition module 500 is connected to the simulation verification module 400 for obtaining the optimized size of each thin plate according to the obtained simulation verification results.

[0121] As described above, the stamping module, positioning and installation module, simulation verification module and optimized size acquisition module can all realize corresponding functions by combining the controller and related functional modules. For example, the stamping module can obtain the laser welding result of the laser welding module through the controller. When the upper welding assembly and the lower welding assembly of the frame are welded, the stamping equipment is controlled to realize the overall stamping and forming operation of the upper welding assembly and the lower welding assembly of the frame as well as other alignment operations.

[0122] In one embodiment, the laser welding module comprises:

[0123] A size range acquisition unit, used to acquire the size range of the thin plates of each component of the frame;

[0124] A pre-assembly and alignment unit is connected to the size range acquisition unit for selecting thin plates of different thicknesses within a size range according to the frame composition, and pre-assembling the frame according to the frame composition and aligning the end faces of adjacent thin plates;

[0125] The laser welding unit is connected to the pre-assembly and alignment unit for laser welding to pre-assemble and align adjacent thin plate end surfaces of different thicknesses into a vehicle frame upper welding assembly and a vehicle frame lower welding assembly.

[0126] In one embodiment, the stamping module comprises:

[0127] An alignment unit, which is in communication with the laser welding module and is used to align the upper welding assembly of the vehicle frame and the lower welding assembly of the vehicle frame;

[0128] A stamping unit, which is in communication with the alignment unit and is used to integrally stamp the aligned upper frame welding assembly and the lower frame welding assembly into a frame welding assembly;

[0129] An edge seam welding unit is connected in communication with the stamping unit and is used for seam welding the frame welding assembly and the lower frame welding assembly and the edge;

[0130] A sleeve seam welding unit is connected to the stamping unit for installing a sleeve in a sleeve hole of the frame welding assembly and seam welding the sleeve into the sleeve hole;

[0131] The upper and lower bushing pressing units are connected to the edge seam welding unit and the sleeve seam welding unit for pressing the upper bushing with guide and the lower bushing with guide into the bushing sleeve.

[0132] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, all or part of the method steps of the above method are implemented.

[0133] The present invention implements all or part of the process in the above method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0134] Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program running on the processor, and when the processor executes the computer program, all or part of the method steps in the above method are implemented.

[0135] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of a computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0136] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the computer device by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, video data, etc.). In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0137] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, servers or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0138] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), servers, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0139] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0140] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0141] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A laser welding method for non-uniform cross-section thin plates with a guiding function, characterized in that: The following steps are involved: Step S1, laser welding thin plates of different thicknesses into an upper frame welding assembly and a lower frame welding assembly; Step S2, integrally stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly; Step S3, positioning and installing the frame welding assembly on the vehicle body through the upper large and lower small guide bushings; Step S4, verifying various aspects of the performance of the frame welding assembly by simulation, and obtaining simulation verification results; Step S5, obtaining the optimized size of each thin plate according to the obtained simulation verification results; The step S1 specifically includes the following steps: Step S11, obtaining the size range of the thin plates of each component of the frame; Step S12, selecting thin plates of different thicknesses within a size range according to the frame composition, pre-assembling the frame according to the frame composition and aligning the end faces of adjacent thin plates; Step S13, pre-assembling and aligning adjacent thin plate end surfaces of different thicknesses by laser welding to form an upper frame welding assembly and a lower frame welding assembly; The step S2 specifically comprises the following steps: Step S21, aligning the upper welding assembly of the frame and the lower welding assembly of the frame; Step S22, integrally stamping the aligned upper frame welding assembly and the lower frame welding assembly into a frame welding assembly; Step S23, seam welding the edges of the upper frame welding assembly and the lower frame welding assembly of the frame welding assembly; Step S24, installing a bushing sleeve in the bushing hole of the frame welding assembly, and seam welding the bushing sleeve to the bushing hole; Step S25, pressing the upper bushing with guide and the lower bushing with guide into the bushing sleeve from top to bottom.

2. The method for laser welding of thin plates with non-uniform cross-sections with a guiding function as claimed in claim 1, characterized in that: The step S3 specifically comprises the following steps: Step S30, the auxiliary tooling is positioned and welded to the frame assembly, and then bolts are passed through the upper large and lower small bushings with guides to position and install them on the mounting holes of the vehicle body.

3. The method for laser welding of thin plates with non-uniform cross-sections with a guiding function as claimed in claim 1, characterized in that: The step S4 specifically comprises the following steps: Step S41, dividing the frame welding assembly into a plurality of grids; Step S42, simulating and verifying various performances of the frame, and obtaining simulation verification results; Step S43, evaluating whether the performance requirements of each grid of the frame welding assembly are met according to the obtained simulation verification results; Step S44, according to whether the performance requirements of each grid of the frame welding assembly are met, different thin plate correction methods for each grid of the frame welding assembly are executed until the performance of each grid of the frame welding assembly meets the requirements, and the sizes of each thin plate when the performance of each grid of the frame welding assembly meets the requirements are obtained.

4. The method for laser welding of thin plates with non-uniform cross-sections with a guiding function as claimed in claim 3, characterized in that: The step S5 specifically comprises the following steps: According to the obtained thin plate sizes when the performance of each grid of the frame welding assembly meets the requirements, multidisciplinary optimization analysis and finite element solution calculation are carried out to obtain the optimal material thickness size of each thin plate of the frame based on the conditions that various performances meet the requirements.

5. The method for laser welding of thin plates with non-uniform cross-sections with a guiding function as claimed in claim 4, characterized in that: After step S5, the following steps are also included: The frame thin plate processing mold is adjusted according to the optimal material thickness size of each frame thin plate based on various performance conditions.

6. A laser welding system for thin plates with non-uniform cross-sections with a guiding function, characterized in that: include: Laser welding module, used for laser welding thin plates of different thicknesses into upper frame welding assembly and lower frame welding assembly; A stamping module is connected to the laser welding module for stamping the upper frame welding assembly and the lower frame welding assembly into a frame welding assembly; A positioning and installation module is connected to the stamping module for positioning and installing the frame welding assembly on the vehicle body through a bushing guide with a large upper part and a small lower part; A simulation verification module, which is in communication with the positioning and installation module and is used to simulate and verify various aspects of the performance of the frame welding assembly and obtain simulation verification results; An optimized size acquisition module, which is in communication with the simulation verification module and is used to obtain the optimized size of each thin plate according to the obtained simulation verification results; The laser welding module comprises: A size range acquisition unit, used to acquire the size range of the thin plates of each component of the frame; A pre-assembly and alignment unit is connected to the size range acquisition unit for selecting thin plates of different thicknesses within a size range according to the frame composition, and pre-assembling the frame according to the frame composition and aligning the end faces of adjacent thin plates; A laser welding unit is connected to the pre-assembly and alignment unit for pre-assembly and alignment of adjacent thin plate end surfaces with different thicknesses by laser welding to form an upper frame welding assembly and a lower frame welding assembly; The stamping module comprises: An alignment unit, which is in communication with the laser welding module and is used to align the upper welding assembly of the vehicle frame and the lower welding assembly of the vehicle frame; A stamping unit, which is in communication with the alignment unit and is used to integrally stamp the aligned upper frame welding assembly and the lower frame welding assembly into a frame welding assembly; An edge seam welding unit is connected in communication with the stamping unit and is used for seam welding the frame welding assembly and the lower frame welding assembly and the edge; A sleeve seam welding unit is connected to the stamping unit for installing a sleeve in a sleeve hole of the frame welding assembly and seam welding the sleeve into the sleeve hole; The upper and lower bushing pressing units are connected to the edge seam welding unit and the sleeve seam welding unit for pressing the upper bushing with guide and the lower bushing with guide into the bushing sleeve.

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