Unequal-thickness and unequal-strength part machining method and part machining equipment

Abstract

The invention discloses an unequal-thickness unequal-strength metal part machining method and part machining equipment, and belongs to the technical field of part machining. The machining procedures can be simplified, the production efficiency is improved, waste is reduced, the production cost is reduced, all the machining procedures are collaboratively optimized, and the part machining quality stability is improved. The method comprises the steps that thickness distribution and strength distribution of a target metal part are determined according to the application state of the target metal part, and the target metal part is divided into at least two area components. And then determining the required metal coiled material corresponding to the region component. And based on the tailor-welding parameters, the tailor-welded coiled material is formed by the multiple metal coiled materials through the tailor-welded laser technology. And finally, the tailor-welded coiled material forms a target metal part through a rolling process based on the rolling parameters.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of part processing, and particularly relates to a metal part processing method and part processing equipment for parts with different thicknesses and different strengths. BACKGROUND

[0002] In the manufacturing industry, with the continuous improvement of the lightweight and high-performance requirements of parts, the traditional manufacturing process cannot meet the processing requirements of complex parts. For example, for parts with different thicknesses and different strength parts, the steel coil is usually cut into different thicknesses and different strength sheet materials, and then the sheet materials are tailor-welded into the required parts. The above processing method is complicated and has low production efficiency. A large amount of waste is generated in the processing process, increasing the production cost. In addition, due to the lack of collaborative optimization of each processing process, the quality of the processed parts is unstable. SUMMARY

[0003] The application aims to at least solve one of the technical problems existing in the prior art. To this end, the application provides a metal part processing method and part processing equipment for parts with different thicknesses and different strengths, which can simplify the processing procedure, improve the production efficiency, reduce the generation of waste and production cost, and improve the quality stability of the processed parts through collaborative optimization of each processing procedure.

[0004] In a first aspect, the application provides a metal part processing method for parts with different thicknesses and different strengths. The method comprises: determining the thickness distribution and strength distribution of a target metal part according to the application state of the target metal part, wherein the application state at least includes the cross-sectional shape of the target metal part and the mechanical property requirement;

[0005] According to the thickness distribution and the strength distribution, the target metal part is divided into at least two area components;

[0006] The area components correspond to required metal coils, wherein the thicknesses of the required metal coils corresponding to different area components are not completely the same, and the strengths of the required metal coils corresponding to different area components are not completely the same;

[0007] At least two metal coils are formed into a tailor-welded coil through a laser tailor-welding process based on tailor-welding parameters, wherein the tailor-welding parameters are parameters determined at least according to the material property relationship between adjacent two metal coils;

[0008] The tailor-welded coil is formed into the target metal part through a rolling process based on rolling parameters, wherein the rolling parameters are determined at least according to the material property relationship between adjacent two metal coils.

[0009] In some embodiments, the welding parameters include welding power and welding speed;

[0010] If the thicknesses of the two adjacent metal coils are different, the thicker metal coil is welded by using a first welding power and a first welding speed, and the thinner metal coil is welded by using a second welding power and a second welding speed, wherein the first welding power is higher than the second welding power, and the first welding speed is higher than the second welding speed.

[0011] In some embodiments, if the thickness difference between the two adjacent metal coils exceeds a thickness difference threshold, it is determined that the thicknesses of the two adjacent metal coils are different.

[0012] In some embodiments, if the strengths of the two adjacent metal coils are different, and the stronger metal coil has a strength Q1 and the weaker metal coil has a strength Q2, a transition metal material having a strength Q3 is added between the two adjacent metal coils during laser welding, wherein Q2

[0013] In some embodiments, if the thicknesses and strengths of the two adjacent metal coils are different, the welding parameters are adjusted according to the welding state of the welding seam obtained in real time during laser welding of the metal coils.

[0014] In some embodiments, the rolling parameters at least include a roller shape parameter, a roller size parameter, and a roller arrangement mode.

[0015] In some embodiments, the rolling parameters are determined according to the material property relationship between the two adjacent metal coils, including: determining the rolling parameters according to the material property relationship between the two adjacent metal coils being currently rolled in different pass rolling processes.

[0016] In some embodiments, determining the metal coil corresponding to the area component includes:

[0017] The metal coil corresponding to the area component is determined according to the shape parameter, the size parameter, the thickness parameter, and the strength parameter of the area component, wherein the determined metal coil has a shape parameter, a size parameter, a thickness parameter, and a strength parameter corresponding to the shape parameter, the size parameter, the thickness parameter, and the strength parameter of the area component, respectively.

[0018] In a second aspect, the embodiments of the present application provide a part processing device, which processes a metal part by using the part processing method of the first aspect. The part processing device includes a laser welding machine and a rolling machine. The laser welding machine is used to weld metal coils with different thicknesses and different strengths into a welded coil through a laser welding process. The rolling machine is used to roll the welded coil into a target metal part through a rolling process.

[0019] In some embodiments, the laser tailor-welding machine comprises an uncoiler, a straightener and a welder, the uncoiler is used to input at least two metal coils to the straightener, the straightener is used to transform the metal coils from a coiled state to a flat state, and the welder is used to perform a laser tailor-welding process on the at least two metal coils in the flat state.

[0020] The unequal thickness and unequal strength metal part processing method provided by the present application comprises the following steps: determining a thickness distribution and a strength distribution of a target metal part according to an application state of the target metal part, and then dividing the target metal part into at least two regional components according to the thickness distribution and the strength distribution, that is, the target metal part is an unequal thickness and unequal strength metal part. Then, the regional components are determined to correspond to required metal coils, and the thicknesses and strengths of the determined multiple metal coils are not completely the same. The multiple metal coils are formed into a tailor-welded coil through a laser tailor-welding process based on tailor-welding parameters. Finally, the tailor-welded coil is formed into the target metal part through a rolling process based on rolling parameters. The tailor-welding parameters and the rolling parameters are adjusted according to the material property relationship between the adjacent two metal coils.

[0021] Compared with the related art, the unequal thickness and unequal strength metal part processing method provided by the present application can simplify the processing procedure, improve the production efficiency, reduce the generation of waste materials and production costs, and improve the processing quality stability of the metal part, because the mechanical property of the target metal part is analyzed before processing, and the combination of metal coils with different thicknesses and strengths is reasonably selected. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic flowchart of an unequal thickness and unequal strength metal part processing method provided by an embodiment of the present application;

[0024] Figure 2 is a schematic principle diagram of tailor-welding multiple metal coils into a tailor-welded metal coil provided by an embodiment of the present application;

[0025] Figure 3 is a schematic principle diagram of a rolling process based on a tailor-welded coil provided by an embodiment of the present application;

[0026] Figure 4 is a schematic cross-sectional view of an automobile chassis U-shaped longitudinal beam provided by the related art;

[0027] Figure 5 is a schematic cross-sectional view of a tailor-welded coil provided by an embodiment of the present application;

[0028] Figure 6 is a schematic sectional view of a U-shaped longitudinal beam of an automobile chassis provided by an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to better understand the technical solutions provided by the embodiments of the present application, the technical solutions of the embodiments of the present application will be described in detail below with the aid of the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0030] In the manufacturing industry, with the continuous improvement of the lightweight and high-performance requirements of parts, the traditional manufacturing process has been unable to meet the processing needs of complex parts. For example, for parts with different thickness and different strength parts, the steel coil is usually cut into different thickness and different strength sheet, and then the sheet is tailor-welded into the required part. The above processing method has complicated process and low production efficiency, and a large amount of waste is generated in the processing process, increasing the production cost, and due to the lack of collaborative optimization of each processing procedure, the part processing quality is unstable.

[0031] Therefore, the embodiments of the present application provide a unequal thickness and unequal strength metal part processing method and part processing equipment, which can simplify the processing procedure, improve the production efficiency, reduce the waste generation and reduce the production cost, and each processing procedure is optimized collaboratively to improve the part processing quality stability.

[0032] The first aspect of the present application provides a unequal thickness and unequal strength metal part processing method. Figure 1 is a schematic flow chart of a unequal thickness and unequal strength metal part processing method provided by an embodiment of the present application. As shown in Figure 1 The unequal thickness and unequal strength metal part processing method comprises the following steps:

[0033] Step S101, according to the application state of the target metal part, the thickness distribution and the strength distribution of the target metal part are determined, wherein the application state at least includes the cross-sectional shape of the target metal part and the mechanical property requirement.

[0034] In the embodiments of the present application, the application state of the target metal part can include the cross-sectional shape of the target metal part and the mechanical property requirement. Specifically, the target metal part can be modeled by using computer aided design (CAD) software. Then the modeling model of the target metal part is input to the computer aided engineering (CAE) software for structure analysis. The structure of the target metal part can also be optimized based on the computer aided engineering software.

[0035] The computer aided engineering software is used to determine the thickness distribution and the strength distribution of the target metal part based on the cross-sectional shape of the target metal part, the dimensional accuracy requirement and the mechanical property requirement, etc. through the simulation analysis of the force on each part of the target metal part. The specific process of the simulation analysis by the computer aided engineering software is not described herein.

[0036] For example, the target metal part is a rocker beam of a vehicle body. The computer modeling model of the rocker beam can be input into the computer aided engineering software for structural analysis to output the stress distribution of the rocker beam. The part where the stress exceeds the yield strength of the metal material or the part with low safety margin needs to be thickened or use a metal material with higher strength.

[0037] The target metal part is a battery pack edge beam. The computer aided engineering software is used to simulate the collision of the battery pack edge beam. If the steel plate near the outside of the battery pack is thickened or strengthened, the crash performance of the battery pack edge beam will be improved and the intrusion amount will be reduced, thereby protecting the battery pack.

[0038] In step S102, the target metal part is divided into at least two regional components according to the thickness distribution and the strength distribution.

[0039] After determining the thickness distribution and the strength distribution of the target metal part, the target metal part is divided into regions according to different thicknesses and different strengths. Finally, the thickness and the strength of the different regional components are not completely the same. The target metal part can be divided based on different thicknesses first, and then divided based on different strengths.

[0040] In the finally obtained regional components, there can be three situations for the adjacent two regional components: the strength of the adjacent two regional components is not the same but the thickness is the same, the thickness of the adjacent two regional components is not the same but the strength is the same, and the thickness and the strength of the adjacent two regional components are not the same.

[0041] In step S103, the metal coil corresponding to the regional components is determined, wherein the thickness of the metal coil corresponding to different regional components is not completely the same, and the strength of the metal coil corresponding to different regional components is not completely the same.

[0042] Specifically, after the target metal part is divided, at least two area components are obtained, and then the area components are determined to correspond to the required metal coils according to the parameter information of the area components. For example, the metal coils with corresponding strength and thickness are selected according to the strength and thickness of the area components. Since the thicknesses of different area components are not completely the same, and the strengths of different area components are not completely the same, the thicknesses of the finally determined metal coils are not completely the same, and the strengths of the finally determined metal coils are not completely the same. That is, between the finally determined two different metal coils, the thicknesses may be different, the strengths may be different, or both the thicknesses and the strengths may be different.

[0043] Steps S102-S103 are actually roll blank design according to the determined thickness distribution and strength distribution of the target metal part. In the roll blank design, the shape and size of the roll blank can be optimized based on the thickness distribution and strength distribution of the metal part, and also based on the flow characteristics and deformation rules of the metal material.

[0044] After the roll blank design is completed, computer-aided engineering software can be used to perform longitudinal blank development, and the three-dimensional roll blank is developed into a two-dimensional planar image. In the development process, the elastic and plastic deformation characteristics of the material can also be considered to calculate and correct the development size, thereby further improving the quality stability of the target metal part.

[0045] According to the longitudinal blank development result, the detailed information of the required metal coils can be determined, including the specific specifications (size information, strength information and thickness information) of the required metal coils and the splicing sequence of the metal coils.

[0046] The determination of the metal coils corresponding to the area components can be specifically the determination of the metal coils corresponding to the area components according to the shape parameters, size parameters, thickness parameters and strength parameters of the area components, wherein the determined metal coils have shape parameters, size parameters, thickness parameters and strength parameters corresponding to the shape parameters, size parameters, thickness parameters and strength parameters of the area components, respectively.

[0047] For example, the target metal part is divided into area parts A, B and C, the area part A has shape parameters a1, size parameters a2, thickness parameters a3 and strength parameters a4, the area part B has shape parameters b1, size parameters b2, thickness parameters b3 and strength parameters b4, and the area part C has shape parameters c1, size parameters c2, thickness parameters c3 and strength parameters c4. Then the metal coil M1 required by the area part A is determined according to the shape parameters a1, size parameters a2, thickness parameters a3 and strength parameters a4. The shape parameters, size parameters, thickness parameters and strength parameters of the metal coil M1 are respectively the same as or similar to the shape parameters a1, size parameters a2, thickness parameters a3 and strength parameters a4 of the area part A.

[0048] Similarly, the metal coil M2 required by the area part B is determined according to the shape parameters b1, size parameters b2, thickness parameters b3 and strength parameters b4. The shape parameters, size parameters, thickness parameters and strength parameters of the metal coil M2 are respectively the same as or similar to the shape parameters b1, size parameters b2, thickness parameters b3 and strength parameters b4 of the area part B.

[0049] The metal coil M3 required by the area part C is determined according to the shape parameters c1, size parameters c2, thickness parameters c3 and strength parameters c4. The shape parameters, size parameters, thickness parameters and strength parameters of the metal coil M3 are respectively the same as or similar to the shape parameters c1, size parameters c2, thickness parameters c3 and strength parameters c4 of the area part C. In this way, the material selection process of the metal coil for different area parts is completed.

[0050] In step S104, at least two metal coils are formed into a tailor-welded coil through a laser tailor-welding process based on tailor-welding parameters, wherein the tailor-welding parameters are determined according to at least the application state of the target metal part and the material property relationship between the adjacent two metal coils.

[0051] According to the determined metal coils and the tailor-welding sequence of the metal coils, the laser tailor-welding process can be performed on the at least two metal coils according to the determined tailor-welding parameters to form a tailor-welded coil.

[0052] Figure 2 is a schematic diagram of the principle of tailoring and welding multiple metal coils into a tailor-welded metal coil provided by the embodiments of the present application. The laser tailor-welding machine 10 includes an uncoiler 11, a straightener 12 and a welder 13. The uncoiler 11 is used to input at least two metal coils to the straightener 12, the straightener 12 is used to change the metal coil from a curled state to a flat state, and the welder 13 is used to perform a laser tailor-welding process on the at least two metal coils in the flat state.

[0053] As shown in FIG. 1, the laser tailor-welding machine 10 includes an uncoiler 11, a straightener 12 and a welder 13. Figure 2As shown, the metal coils M1, M2 and M3 are arranged from top to bottom ( Figure 2 The uncoiler 11 is arranged in the middle (Z-direction). Through holes are provided on the side of the uncoiler 11 for the metal coils to pass through. One end of the metal coils M1, M2, and M3 passes through the through holes arranged from top to bottom. The uncoiler 11 simultaneously feeds the metal coils M1, M2, and M3 into the straightener 12. The straightener 12 converts the coiled metal coils M1, M2, and M3 into a straight state before feeding them into the welding machine 13.

[0054] Figure 2 Two welders 13 are shown. The welder 13 closest to the straightener 12 first laser welds the metal coils M2 and M3, producing a spliced ​​coil M2M3. The spliced ​​coil M2M3 and the metal coil M1 then simultaneously enter the welder 13 further away from the straightener 12. The welder 13 further away from the straightener 12 laser welds the spliced ​​coil M2M3 and the metal coil M1, producing the desired tailor-welded coil M1M2M3.

[0055] It should be noted that the embodiment of the present application directly welds the metal coils, and the material after welding is also a coil. Therefore, the rolling process can be directly performed based on the coils after welding, thereby improving material utilization and reducing waste generation, while ensuring that the quality and performance of the welded metal coils meet the requirements of subsequent rolling forming.

[0056] The welding parameters of the embodiment of the present application may include welding power and welding speed.

[0057] If the thicknesses of two adjacent metal coils are different, the thicker metal coil is welded using a first welding power and a first welding speed, and the thinner metal coil is welded using a second welding power and a second welding speed, wherein the first welding power is higher than the second welding power, and the first welding speed is higher than the second welding speed.

[0058] In other words, for laser welding two metal coils of different thicknesses, a gradual welding parameter setting can be used. A higher welding power and speed are used on the thicker metal coil side to fully melt the thicker metal coil. A lower welding power and speed are used on the thinner metal coil side to prevent the thinner metal coil from overheating and burning through.

[0059] In some embodiments, a thickness difference threshold value can be set. If it is determined that the thickness difference between the two adjacent metal strips exceeds the thickness difference threshold value, it is determined that the thicknesses of the two adjacent metal strips are not the same. If it is determined that the thickness difference between the two adjacent metal strips does not exceed the thickness difference threshold value, it is determined that the thicknesses of the two adjacent metal strips are the same. Since the metal strips with small thickness difference are not prone to the above problems, it is not necessary to set the gradient welding parameters, thereby improving the welding efficiency and the production efficiency of the target metal part.

[0060] If the strengths of the two adjacent metal strips are not the same, and the metal strip with greater strength has a strength Q1, and the metal strip with smaller strength has a strength Q2, a transition metal material is added between the two adjacent metal strips during laser tailor welding, and the transition metal material has a strength Q3, wherein Q2

[0061] If the thicknesses and strengths of the two adjacent metal strips are not the same, the welding parameters are adjusted according to the welding state of the welding seam obtained in real time during laser tailor welding of the metal strips.

[0062] Specifically, the welding state of the welding seam can be monitored in real time by using an optical coherence imaging detection method, and then the welding state image monitored in real time is sent to the processor. Optical coherence imaging (Optical Coherence Tomography, OCT) is a high-resolution imaging technology based on low-coherence light interference. The optical coherence imaging detection method uses near-infrared light (the wavelength is usually 800-1300 nm) to irradiate the surface of the welding seam, generates a cross-sectional or three-dimensional image by measuring the interference signal of the reflected light. The optical coherence imaging detection method can detect surface defects (undercut, surface cracks, spatter, etc.), subsurface defects (near-surface pores, micro-cracks, incomplete fusion, slag inclusion, etc.), and geometric parameter measurement (welding seam width, excess height, groove shape, etc.).

[0063] The processor analyzes the welding state image in real time, judges the quality of the welding state according to the analysis result, and determines the welding parameters that need to be adjusted according to the welding state. For example, if it is determined from the welding state image that the penetration is insufficient and the welding seam is narrow, the welding speed can be reduced. If it is determined from the welding state image that the welding seam is deformed or the grain is coarse, the welding speed can be increased. If it is determined from the welding state image that the penetration is insufficient and the welding seam is raised, the welding voltage can be increased. If it is determined from the welding state image that the welding seam has excessive penetration, burns through, and has too much spatter, the welding current can be reduced.

[0064] In the embodiment of the present application, during the laser welding process, the laser vision sensor can be used to monitor the weld width in real time, and a specific weld width can be set. The internal quality of the weld can also be detected by an ultrasonic flaw detector. If a small crack is detected, the weld can be repaired through a laser repair program to improve the weld quality.

[0065] In step S105, the tailor-welded blank is formed into a target metal part through a rolling process based on rolling parameters, wherein the rolling parameters are determined at least according to the material property relationship between the two adjacent metal blanks.

[0066] The tailor-welded blank formed after the laser tailor-welding process in step S104 is still a metal blank, so the rolling process can be directly performed after the laser tailor-welding process without the need for further cutting of the tailor-welded blank, which can avoid waste of metal blanks and improve the production efficiency of the target metal part.

[0067] Figure 3 is a schematic diagram of the principle of the rolling process based on the tailor-welded blank provided by the embodiment of the present application. The rolling machine includes a plurality of rollers. During the rolling process, the tailor-welded blank gradually undergoes plastic deformation under the action of the plurality of rollers, and finally forms a target metal part with a desired shape.

[0068] The rolling process is a processing method for changing the shape, size or performance of a metal or other material by applying pressure to it through rollers. The rolling process includes the following steps: material preparation, placing the material to be pressed into the rolling machine, and setting appropriate pressure and speed parameters. A pair or multiple pairs of pressure rollers rotating in different directions are used to apply continuous pressure to the material to make it undergo plastic deformation and reduce its thickness.

[0069] The rolling parameters at least include rolling force, rolling speed, reduction rate and tension control. The calculation formula of the rolling force is:

[0070]

[0071] wherein k is the deformation resistance coefficient of the tailor-welded blank, b is the width of the tailor-welded blank, R is the rolling radius, Δh is the reduction, σ avg is an adjustment coefficient. High-strength materials require an increase in the rolling radius or a decrease in the reduction. The present embodiment can use cold rolling, and the total reduction rate of cold rolling can reach 90%. The rolling speed of cold rolling is 0.5-5 m / s. Tension control includes front tension and rear tension. The front tension is used to reduce the rolling force and prevent slipping, and the rear tension is used to improve the plate shape and suppress edge cracking. Since the present embodiment is aimed at the rolling forming process of the tailor-welded blank, the rolling parameters need to be determined based on the material properties and the material property relationship of all the metal blanks in the tailor-welded blank.

[0072] Therefore, determining the rolling parameters according to the material property relationship between the two adjacent metal coils can include:

[0073] In the different pass rolling process, the rolling parameters are determined according to the material property relationship between the two adjacent metal coils currently being rolled. That is, the rolling parameters are determined according to the metal coil currently being rolled in the different pass rolling process.

[0074] For example, the tailor-welded coil is tailor-welded from three tailor-welded coils: M1, M2, and M3. When the tailor-welded coil is rolled, M1 and M2 need to be rolled (M2 is pressed against M1), so the rolling parameters of the first pass need to consider the material property relationship of the metal coil M1 and the metal coil M2. The rolling parameters of the second pass need to consider the material property relationship of the metal coil M2 and the metal coil M3.

[0075] Specifically, for example, the thickness of the metal coil M1 and the metal coil M2 is quite different, so the reduction rate of the first pass needs to be reduced to avoid cracking between the metal coil M1 and the metal coil M2. The weld hardness between the metal coil M2 and the metal coil M3 is large after welding, so multiple passes need to be rolled. The metal coil M2 and the metal coil M3 are anisotropic, so appropriate front tension and back tension need to be controlled to achieve balanced deformation.

[0076] Therefore, the embodiments of the present application can not only directly roll the tailor-welded coil, but also adjust the rolling process parameters based on the material property relationship between multiple different metal coils, thereby further improving the quality stability of the target metal part.

[0077] Based on the unequal thickness and unequal strength metal part processing method of the first aspect, the following is a specific example of the scheme. The following is a specific example of manufacturing an automobile chassis U-shaped longitudinal beam.

[0078] Figure 4 is a schematic diagram of the automobile chassis U-shaped longitudinal beam provided by the related art. Figure 4 The automobile chassis U-shaped longitudinal beam in is made of HC340LA (a kind of cold-rolled automobile structural steel) coil, and the overall thickness is 3 mm. The overall length of the automobile chassis U-shaped longitudinal beam is 1.5 m, and the weight is 9.42 kg.

[0079] Based on the method of the embodiments of the present application, the structure of the automobile chassis U-shaped longitudinal beam is optimized to obtain Figure 6The shown optimized structure of the automobile chassis U-shaped longitudinal beam. The optimized structure of the automobile chassis U-shaped longitudinal beam is a metal part with unequal thickness and unequal strength. The thickness distribution and strength distribution can be determined according to the cross-sectional shape and mechanical property requirements. Among them, the thickness and strength of the brim and the bottom plate are the same, and the thickness and strength of the two side walls are the same, while the thickness and strength of the side walls and the brim and the bottom plate are not the same.

[0080] After determining the thickness distribution and strength distribution of the automobile chassis U-shaped longitudinal beam, the automobile chassis U-shaped longitudinal beam can be divided into five regional components, namely: brim 1, side wall 2, bottom plate 3, side wall 4 and brim 5. Then the required metal coil can be determined based on the five regional components.

[0081] Specifically, the size, strength and thickness of the brim 1 and the brim 5 are the same, so the same coil M1 can be used, for example, 3mm HC340LA (a kind of cold-rolled automobile structural steel), the size, strength and thickness of the side wall 2 and the side wall 3 are the same, so the same coil M2 can be used, for example, 2mm HC550LA (a kind of cold-rolled automobile structural steel, higher strength than HC340LA). Although the strength and thickness of the bottom plate are the same as those of the brim 1, the size of the two is not the same, so the coil M3 (3mm HC340LA, the same coil as M1 but the size is different from M1) can be used.

[0082] After determining the required metal coil corresponding to the regional components, the welding sequence of different coils needs to be determined. For example Figure 6 The shown welding sequence diagram, the brim 1 (M1 coil, 3mm HC340LA) is first laser-welded with the side wall 2 (M2 coil, 2mm HC550LA), then laser-welded with the bottom plate 3 (M3 coil, 3mm HC340LA), then laser-welded with the side wall 4 (M2 coil, 2mm HC550LA), and finally laser-welded with the brim 5 (M1 coil, 3mm HC340LA), to obtain Figure 5 The shown welded coil.

[0083] The welding parameters are set as follows: welding power: 3000W; welding speed: 5m / min; pulse frequency: 10kHz.

[0084] Finally, the Figure 5 The shown welded coil is formed into Figure 6The automobile chassis U-shaped longitudinal beam shown in the figure. In the embodiment of the application, a special roller pressing die set can be designed, the roller diameter is 200 mm, and the roller surface is coated with diamond to improve wear resistance. The mold cooling system adopts water cooling, the cooling water flow is 5 L / min, and the cooling water temperature is controlled at 20℃±2℃. The roller pressing speed is set to 1 m / min, and the roller pressing pressure is set to 100 kN. A strain sensor can be set to monitor the strain of the material in real time, and the maximum strain is set to 8%. When the strain of a certain area exceeds the set threshold, the control system automatically reduces the roller pressing speed to 0.8 m / min and increases the local pressure to 120 kN.

[0085] Figure 6 The automobile chassis U-shaped longitudinal beam in the figure still uses HC340LA coiled material with a thickness of 3 mm for the brim and the bottom plate, and HC550LA (a cold-rolled automobile structural steel with higher strength than HC340LA) is used at the side position. Figure 6 The automobile chassis U-shaped longitudinal beam shown in the figure has a weight of only 7.85 kg based on the same basic size. Therefore, the automobile chassis U-shaped longitudinal beam formed in this way not only improves the mechanical properties but also reduces the overall weight of the part, achieving lightweight of the part.

[0086] After actual production operation, the unequal thickness and unequal strength metal part processing method of the embodiment of the application is used to produce Figure 6 The automobile chassis U-shaped longitudinal beam shown in the figure only needs 1.5 hours per piece, while the traditional process takes 4 hours per piece to produce similar parts, and the production efficiency can be improved by 166%. And the material utilization rate of the traditional process is 65%, while the material utilization rate of the unequal thickness and unequal strength metal part processing method of the embodiment of the application reaches 92%, significantly reducing waste and production cost. Taking the annual production of 100,000 automobile chassis structural parts as an example: the cost reduction benefit: lightweight of nearly 200 tons, the material is calculated at 5,000 yuan per ton, and the single part benefit can reach 1 million yuan. The lightweight benefit: the lightweight benefit of a single vehicle improves the competitiveness of the product, while reducing carbon emissions.

[0087] The unequal thickness and unequal strength metal part processing method of the application determines the thickness distribution and strength distribution of the target metal part according to the application state of the target metal part, and then divides the target metal part into at least two regional components according to the thickness distribution and strength distribution, that is, the target metal part is an unequal thickness and unequal strength metal part. Then determine the corresponding metal coiled material of the regional component, and the thickness and strength of the determined multiple metal coiled materials are not completely the same. Based on the tailor-welding parameters, the tailor-welding coiled material is formed by laser tailor-welding process. Finally, the tailor-welding coiled material is formed into the target metal part by roller pressing process based on the roller pressing parameters. The tailor-welding parameters and the roller pressing parameters are adjusted according to the material property relationship between the adjacent two metal coiled materials.

[0088] Compared with the related art, the unequal-thickness and unequal-strength metal part processing method of the present application can simplify the processing procedure and improve the production efficiency by performing mechanical property analysis on the target metal part before processing and reasonably selecting the combination of metal coil materials with different thicknesses and strengths. During the processing of the target metal part, the metal coil materials are spliced and then directly subjected to the roll forming process, without the need for material cutting in between, so as to reduce the generation of waste materials and lower the production cost. Moreover, the laser splicing process is adjusted according to the splicing parameters of the metal coil materials, and the roll forming process is adjusted according to the weld formed by the laser splicing process, so as to realize the collaborative optimization of the laser splicing process and the roll forming process, thereby improving the processing quality stability of the parts.

[0089] The second aspect of the present application provides a part processing device. The part processing device processes metal parts by using the unequal-thickness and unequal-strength metal part processing method of the first aspect, such as shown in Figure 2 and Figure 3 The part processing device includes a laser splicing machine 10 and a roll forming machine 20. The laser splicing machine 10 is used to splice metal coil materials with different thicknesses and strengths into spliced coil materials through a laser splicing process, and the roll forming machine 20 is used to roll the spliced coil materials into target metal parts through a roll forming process.

[0090] It should be noted that an uncoiling device 30 and an automatic feeding device 40 can also be arranged between the laser splicing machine 10 and the roll forming machine 20 of the embodiments of the present application, so as to realize continuous and stable uncoiling and feeding of the spliced coil materials. The uncoiling device 30 has a tension control function, which can adjust the uncoiling tension according to the parameters such as the material, thickness and width of the spliced coil materials, so as to prevent the spliced coil materials from being wrinkled or torn during the uncoiling process. The automatic feeding device 40 can transport the uncoiled spliced coil materials to the roll forming machine, and the feeding speed can be adjusted according to the requirements of the roll forming process.

[0091] As shown in Figure 2 The laser splicing machine 10 of the embodiments of the present application includes an uncoiler 11, a straightener 12 and a welder 13. The uncoiler 11 is used to input at least two metal coil materials to the straightener 12, the straightener 12 is used to convert the metal coil materials from a curled state to a flat state, and the welder 13 is used to perform a laser splicing process on the at least two metal coil materials in the flat state.

[0092] Figure 3 The roll forming machine 20 includes a plurality of upper forming rollers 21, which are used to perform a plurality of passes of roll forming process. The upper part of the upper forming roller 21 is a corresponding sheet forming section view, and the lower part is a corresponding section view of the forming roller.

[0093] It should be noted that in the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0094] Those skilled in the art will understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0095] The embodiments of the present application are described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams 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 computer, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0096] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0098] The embodiments of the present application also provide a computer program product, which includes computer software instructions, when the computer software instructions run on a processing device, make the processing device execute the flow of the unequal thickness and unequal strength metal part machining process in the corresponding embodiment. The embodiments of the present application are described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams 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 computer, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0096] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more blocks.

[0098] The embodiments of the present application also provide a computer program product, which includes computer software instructions, when the computer software instructions run on a processing device, make the processing device execute the flow of the unequal thickness and unequal strength metal part machining process in the corresponding embodiment.

Claims

1. A method for processing metal parts of unequal thickness and unequal strength, characterized in that: The method comprises: Determining a thickness distribution and a strength distribution of the target metal part according to an application state of the target metal part, wherein the application state includes at least a cross-sectional shape and mechanical property requirements of the target metal part; Dividing the target metal part into at least two area components according to the thickness distribution and the strength distribution; Determining the metal coils required for the regional components, wherein the thicknesses of the metal coils required for the components in different regional areas are not completely the same, and the strengths of the metal coils required for the components in different regional areas are not completely the same; Forming a welded coil by laser welding at least two of the metal coils based on welding parameters, wherein the welding parameters are determined based on at least a relationship between material properties of the two adjacent metal coils; The tailor-welded coils are formed into the target metal part through a rolling process based on rolling parameters, wherein the rolling parameters are determined according to a relationship between material properties of at least two adjacent metal coils.

2. The method for processing metal parts of unequal thickness and unequal strength according to claim 1, characterized in that: The welding parameters include welding power and welding speed; If the thicknesses of the two adjacent metal coils are different, the thicker metal coil is welded using a first welding power and a first welding speed, and the thinner metal coil is welded using a second welding power and a second welding speed, wherein the first welding power is higher than the second welding power, and the first welding speed is higher than the second welding speed.

3. The method for processing metal parts of unequal thickness and unequal strength according to claim 2, characterized in that: If the thickness difference between the two adjacent metal coils exceeds a thickness difference threshold, it is determined that the thicknesses of the two adjacent metal coils are different.

4. The method for processing metal parts of unequal thickness and unequal strength according to claim 1, characterized in that: If the strengths of the two adjacent metal coils are different, and the metal coil with greater strength has a strength Q1 and the metal coil with less strength has a strength Q2, when the two adjacent metal coils are laser welded, a transition metal material is added between the two adjacent metal coils, and the transition metal material has a strength Q3, wherein Q2<Q3<Q1.

5. The method for processing metal parts of unequal thickness and unequal strength according to claim 1, characterized in that: If the thickness and strength of the two adjacent metal coils are different, when the metal coils are laser welded, the welding parameters are adjusted according to the welding state of the weld obtained in real time.

6. The method for processing metal parts of unequal thickness and unequal strength according to claim 1, characterized in that: The rolling parameters include at least rolling force, rolling speed, reduction rate and tension control.

7. The method for processing metal parts of unequal thickness and unequal strength according to claim 6, characterized in that: The rolling parameters are determined according to the material property relationship between two adjacent metal coils, including: During the rolling process of different passes, the rolling parameters are determined according to the material property relationship between two adjacent metal coils currently being rolled.

8. The method for processing metal parts of unequal thickness and unequal strength according to claim 1, characterized in that: Determine the metal coils required for the components in the area, including: The metal coil required for the regional component is determined based on the shape parameters, size parameters, thickness parameters and strength parameters of the regional component, wherein the determined metal coil has shape parameters, size parameters, thickness parameters and strength parameters that respectively correspond to the shape parameters, size parameters, thickness parameters and strength parameters of the regional component.

9. A parts processing equipment, characterized in that, The parts processing equipment applies the method for processing metal parts of unequal thickness and unequal strength as described in any one of claims 1 to 8 to process metal parts, and the parts processing equipment includes: a laser welding machine and a roller press, the laser welding machine is used to weld metal coils of unequal thickness and unequal strength into welded coils through a laser welding process, and the roller press is used to roll the welded coils into target metal parts through a rolling process.

10. The equipment for processing metal parts of unequal thickness and unequal strength according to claim 9, characterized in that: The laser welding machine includes an uncoiler, a straightener and a welder. The uncoiler is used to input at least two metal coils into the straightener. The straightener is used to transform the metal coils from a curled state to a straight state. The welder is used to perform a laser welding process on the at least two metal coils in the straight state.

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