Metal plate component hemming butt welding joint process method

Abstract

The invention relates to the field of sheet metal components, and discloses a sheet metal component hemming butt joint welding joint process method which comprises a flat plate component and a hemming component, the flat plate component is in butt joint with the hemming component, and the end of the flat plate component extends to be in direct contact with a bent R angle of the hemming component; a unilateral V-shaped welding structure is formed at the butt joint and is suitable for reducing welding gaps and preventing deformation in the welding process; the hemming component is connected with the flat plate component in a welding mode, the thickness of a welding seam is close to the thickness of base metal so that the structural stability of a welding joint can be guaranteed, and the angle of the single-side V-shaped structure is determined by the butt joint mode of the flat plate component and the hemming component. By optimizing the flat plate extension design and adopting the friction stir welding technology and the real-time monitoring system, the welding seam strength and uniformity are improved, the heat influence and deformation are reduced, the accurate control of the welding process is ensured, and the welding quality consistency and the joint stability are improved.

Description

Technical Field

[0001] The invention relates to the field of sheet metal components, in particular to a process method for curling butt welding joints of sheet metal components. Background Art

[0002] The butt weld of sheet metal components is a common connection method in sheet metal processing. It is widely used in the automotive, shipbuilding, aerospace and other industries. Sheet metal structural parts are usually welded by butt welding to achieve high strength, good rigidity and strong durability. In this process, the quality of welding directly affects the overall performance and service life of the product. Therefore, the reasonable design of the structure and welding process of the butt weld is one of the core technologies in the field of sheet metal manufacturing.

[0003] Existing sheet metal component rolled butt welds usually use traditional fusion welding technology, which heats the flat component and the rolled component to melt and combine at the weld to form a weld. Fusion welding technology can provide higher welding strength and has been widely used in many sheet metal manufacturing processes. The existing process can achieve higher structural bonding strength and meet the product use requirements in most cases. It has certain production efficiency and better welding effect.

[0004] However, there are some shortcomings in the application of sheet metal rolled butt welding joints in the prior art. First, the problems of uneven weld gap and weld strength are relatively common, which can easily lead to deformation and insufficient strength of the structure after welding, affecting the stability of the welded joint. Secondly, the traditional fusion welding process is prone to produce a large heat-affected zone, resulting in thermal damage to the welding area and degradation of material properties. Finally, the prior art lacks real-time monitoring of the welding process, and the quality of the weld mainly depends on post-weld inspection. It is difficult to detect and correct welding defects in time, resulting in poor consistency in welding quality, increased production costs and rework rates. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a process method for the rolled butt welding joint of a sheet metal component. The present invention improves the strength and uniformity of the weld and reduces the thermal influence and deformation of the welding area by optimizing the design of the extended part of the flat plate component, adopting friction stir welding technology and a real-time monitoring system combining a temperature sensor and image monitoring, thereby ensuring precise control of the welding process and improving the consistency of the welding quality and the stability of the joint.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A sheet metal component curling butt welding joint, comprising:

[0007] A flat plate member and a curling member, wherein the flat plate member is butted against the curling member, and an end of the flat plate member is extended to directly contact the bent R angle of the curling member;

[0008] The butt joint forms a single-sided V-shaped welding structure, which is suitable for reducing the welding gap and preventing deformation during welding;

[0009] The curling member is connected to the flat plate member by welding, wherein the thickness of the weld is close to the thickness of the parent material to ensure the structural stability of the welded joint.

[0010] Preferably, the angle of the single-sided V-shaped structure is determined by the docking method of the flat plate component and the curling component, and is appropriately adjusted according to the required strength.

[0011] Preferably, the bending R angle of the curling member is 2 to 3 times the thickness of the flat plate member, and a low thermal stress level is maintained after welding.

[0012] The present invention also provides a process for preparing a butt welded joint of a sheet metal component, comprising the following steps:

[0013] S1. Determine the length of the extended portion of the flat plate member by calculation so that it is in direct contact with the curling member at the bending R angle;

[0014] S2. When making the blanking expansion drawing, the size of the flat plate component is adjusted accordingly to adapt to the extended design;

[0015] S3, butting the adjusted flat plate member with the curled edge member to form a single-sided V-shaped welded structure by welding;

[0016] S4. During the welding process, heat input is controlled to ensure that the thickness difference between the weld and the base material is minimized to reduce welding deformation.

[0017] Preferably, the S1 further comprises: calculating the extension length of the flat plate component by software, which is specifically determined based on the numerical relationship between the bending radius of the curling component and the thickness of the sheet metal.

[0018] Preferably, S4 further includes: presetting the width and depth of the weld by computer-aided design to ensure precise control of the weld size during the welding process.

[0019] The present invention also provides a method for using a rolled butt weld joint of a sheet metal component, comprising the following steps:

[0020] Determine the optimal length of the flat plate member extended to the curling edge to ensure that the two are butted together without gap at the R corner;

[0021] Perform assembly checks before butting flat plate components and hemmed components to ensure alignment;

[0022] Use appropriate welding techniques for welding and monitor welding temperature and weld quality through a real-time monitoring system;

[0023] After welding, local heating is performed through a flame heating plate to level the slight deformation caused by welding.

[0024] Preferably, the assembly inspection includes: completing it through an automated inspection system to ensure that the joint alignment accuracy reaches within 0.1 mm.

[0025] Preferably, the welding technique comprises using friction stir welding to ensure that the heat affected zone generated during the welding process is minimized.

[0026] Preferably, the real-time monitoring system includes: a temperature sensor and an image monitoring device, which are used to monitor the welding temperature and the weld formation process in real time.

[0027] The present invention provides a process method for welding the butt joint of a sheet metal component. It has the following beneficial effects:

[0028] 1. The present invention ensures seamless connection between the flat plate and the rolled edge component by designing an extended portion of the flat plate component, thereby improving the strength and uniformity of the weld, reducing the risk of weld gap and structural deformation during welding, and thus improving the stability and service life of the welded joint.

[0029] 2. The present invention reduces the heat affected zone during welding, reduces thermal damage and deformation in the welding area, and improves welding quality by adopting friction stir welding technology. At the same time, the need for post-welding processing is reduced, further improving production efficiency and consistency of welding quality.

[0030] 3. The present invention ensures accurate control of the welding process through real-time monitoring by temperature sensors and image monitoring equipment, thereby improving the reliability and accuracy of welding quality and reducing the incidence of welding defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the sheet metal component of the present invention;

[0032] Figure 2 is a flow chart of the preparation method of the present invention;

[0033] Figure 3 The figure is a flow chart of the method for using the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Please see attached Figure 1 The embodiment of the present invention provides a sheet metal component butt weld joint, comprising:

[0036] Flat plate components and hemming components, the flat plate components are butt-jointed with the hemming components, and the ends of the flat plate components are extended to directly contact the bending R angle of the hemming components. The flat plate is extended to the hemming components to reduce the welding gap and avoid the problem of uneven welds caused by the R angle, thereby improving the strength of the weld joint and reducing the risk of welding deformation;

[0037] The single-sided V-shaped welding structure is formed at the butt joint, which is suitable for reducing the welding gap and preventing deformation during welding. The single-sided V-shaped welding structure can optimize the shape of the welding gap, making the filler distribution more uniform during welding and the welding stress lower, thereby effectively reducing the deformation after welding and improving the strength of the welded joint and the overall structural stability;

[0038] The rolled component and the flat component are connected by welding, in which the thickness of the weld is close to the thickness of the base material to ensure the structural stability of the welded joint. The weld thickness is close to that of the base material, which can ensure that the strength of the welded area is consistent with that of other unwelded areas, reduce the stress concentration caused by the difference in heat input during the welding process, prevent local deformation of the welded part, and improve the overall structural stability of the welded joint.

[0039] Please see attached Figure 1 In a preferred embodiment of the present invention, the angle of the unilateral V-shaped structure is determined by the docking method of the flat plate component and the curling component, and is appropriately adjusted according to the required strength. If the V-shaped angle of the V-shaped structure is too large, more welding materials need to be filled during the welding process, which will increase the heat input and cause greater thermal deformation in the welding area; if the angle is too small, the welding material may be unevenly distributed and the weld is unstable during the welding process. Therefore, in the design process, the optimal V-shaped angle needs to be determined based on the material, thickness and stress requirements of the actual components. By reasonably designing the V-shaped structure angle according to the docking method of the flat plate component and the curling component, the distribution of welding materials can be optimized, thermal deformation can be reduced, and the stability and strength of the welded joint can be ensured.

[0040] Please see attached Figure 1In a preferred embodiment of the present invention, the bending R angle of the curling member is 2 to 3 times the thickness of the flat member, and a low thermal stress level is maintained after welding. A larger bending R angle can reduce stress concentration at the bending point and reduce the risk of cracks or deformation caused by excessive stress concentration during welding. Especially in the case of thicker welded sheet metal, a larger bending radius can improve the support conditions of the weld and prevent excessive deformation of the curling part. By designing the bending R angle to be 2 to 3 times the thickness of the flat member, the stress concentration at the bending part during welding can be significantly reduced, the weld formation can be optimized, the strength and stability of the welded joint can be improved, and the risk of deformation after welding can be reduced. At the same time, the thermal stress resistance of the welded joint is improved, ensuring the long-term stability and reliability of the welded joint.

[0041] Please see attached Figure 2 The present invention also provides a preparation process for a sheet metal component butt weld joint, comprising the following steps:

[0042] S1. Determine the length of the extended part of the flat plate component by calculation so that it can form direct contact with the curled edge component at the bending R angle. If the extension is too short, the gap at the bending point cannot be completely filled, which may cause the gap to be too large during welding and reduce the quality of the weld. If the extension is too long, the amount of material used will be increased unnecessarily, affecting the overall coordination of the structure. By calculating the extended length of the flat plate component, ensure good contact between the curled edge component and the flat plate component, avoid large gaps during welding, improve welding accuracy and quality, and reduce the possibility of subsequent welding defects.

[0043] S2. When making the blanking expansion drawing, the size of the flat plate component is adjusted accordingly to adapt to the extended design. By accurately adjusting the size of the extended part of the flat plate on the blanking expansion drawing, it can ensure that the components formed in production are consistent with the design, avoid welding problems caused by dimensional errors, and thus improve the welding quality and the accuracy of the overall process;

[0044] S3. Butt the adjusted flat plate component with the curled edge component to form a single-sided V-shaped welding structure by welding. When butt-jointing, it is necessary to ensure the alignment of the flat plate component and the curled edge component to ensure the stability of the V-shaped structure during welding. The single-sided V-shaped welding structure can make the welding material evenly distributed in the weld and provide good mechanical support. By forming a single-sided V-shaped welding structure, the welding gap is effectively filled, the strength of the welding area is enhanced, the stress concentration in the weld is reduced, and the tensile and shear resistance of the joint is improved, thereby improving the overall performance of the welded joint;

[0045] S4. During the welding process, the heat input is controlled to ensure that the thickness difference between the weld and the base material is minimized and welding deformation is reduced. The control of welding heat input is an important factor affecting the welding quality. Excessive heat input will cause the local temperature of the welding part to be too high, causing thermal deformation, which will affect the dimensional accuracy of the joint and the quality of the weld. Insufficient heat input may cause the weld to be loose and the weld to be insufficiently bonded to the base material. By controlling the welding heat input, the thermal deformation problem during the welding process is reduced, while ensuring a good bond between the weld and the base material, ensuring the consistency of the weld strength and the thickness of the base material, and thus improving the stability and service life of the welded joint.

[0046] Please see attached Figure 2 In a preferred embodiment of the present invention, S1 further includes: calculating the extended length of the flat member by software, which is specifically determined based on the numerical relationship between the bending radius of the curling member and the sheet metal thickness. Calculating the extended part by software can avoid errors that may occur in manual calculations, and ensure that the length of the extended part is strictly matched with factors such as the bending radius of the curling member and the sheet metal thickness, so that the numerical relationship between the bending radius of the curling member and the sheet metal thickness can be considered, ensuring seamless connection between the extended part and the curling member, which not only improves the design accuracy, but also improves production efficiency through automated tools and reduces production errors.

[0047] Please see attached Figure 2 In a preferred embodiment of the present invention, S4 further includes: presetting the width and depth of the weld by computer-aided design to ensure precise control of the weld size during welding. By presetting the weld width using computer-aided design software and performing simulation analysis, the consistency and reliability of welding can be improved. Especially in complex structures or multi-layer welding, the control of the weld can reduce deformation, improve the quality of the weld, and ultimately ensure the overall strength and durability of the component.

[0048] Please see attached Figure 3 The present invention also provides a method for using a sheet metal component butt weld joint, comprising the following steps:

[0049] Determine the optimal length of the flat component extended to the hem to ensure that the two are butted together without gap at the R angle. This process can be simulated and analyzed with the help of computer-aided design software to determine the optimal value of the extension length, thereby ensuring that no weld gap is generated in the bending area of ​​the hem component, avoiding defects in subsequent welding, effectively avoiding gaps in the weld, and improving welding quality, ensuring the uniformity and strength of the weld, and preventing cracks or structural deformation after welding;

[0050] Before the flat plate components and the hemmed components are butt-jointed, an assembly inspection is performed to ensure alignment. The assembly inspection before butt-jointing ensures the precise alignment of the flat plate and the hemmed components, reduces the offset and misalignment during welding, thereby improving the uniformity of the weld and the overall welding quality, and avoiding welding defects caused by assembly errors;

[0051] Use appropriate welding technology for welding, and monitor the welding temperature and weld quality through a real-time monitoring system. Through real-time monitoring of the temperature and weld quality during welding, the heat input during welding can be accurately controlled to prevent the decline of welding quality, reduce the occurrence of welding defects, ensure the strength and stability of the weld, and improve the overall welding efficiency;

[0052] After welding, local heating is performed through the flame heating plate to level the slight deformation caused by welding. Local heating treatment through the flame heating plate can effectively eliminate the slight deformation caused by the welding process, restore the flatness and shape of the component, avoid long-term use problems caused by stress concentration after welding, and ensure the high strength and durability of the welded joint.

[0053] Please see attached Figure 3 In a preferred embodiment of the present invention, the assembly inspection includes: completing it through an automated detection system to ensure that the joint alignment accuracy is within 0.1 mm. Through the automated detection system, the relative positions of the components can be monitored in real time before and after assembly to ensure that their docking accuracy meets the preset standards. The data acquisition system transmits the data collected by the sensor to the control system in real time, and the control system adjusts the position of the component according to the data feedback to ensure the alignment accuracy during the assembly process, thereby effectively reducing the dimensional error and welding defects in welding, improving the uniformity, strength and overall welding quality of the weld, and also improving production efficiency and reducing manual operation errors.

[0054] Please see attached Figure 3 In a preferred embodiment of the present invention, the welding technology includes: using friction stir welding to ensure that the heat affected zone generated during the welding process is minimized, and utilizing the stirring action to mix the two pieces of material together to form a dense and strong weld. Since the material is not melted, the metallurgical structure of the weld remains relatively stable, and the heat generated during the welding process is limited to the surface and local area of ​​the material, thereby controlling the heat affected zone to a minimum range, which not only ensures the high strength and uniformity of the weld, but also reduces the complexity of post-weld processing, thereby improving production efficiency.

[0055] Please see attached Figure 3In a preferred embodiment of the present invention, the real-time monitoring system includes: a temperature sensor and an image monitoring device, which are used to monitor the welding temperature and the weld formation process in real time. In the process of curling butt welding of sheet metal components, too high a temperature may lead to excessive melting of the base material or weakening of the weld, while too low a temperature may lead to insufficient welding. The temperature sensor can measure the temperature change of the welding area in real time and feed the data back to the control system. By adjusting the current, voltage and welding speed of the welding equipment, it is ensured that the temperature during the welding process is kept within the set range, preventing excessive temperature fluctuations from causing a decrease in weld quality, avoiding welding defects caused by too high or too low a temperature, and ensuring the bonding strength between the weld and the base material. , thereby improving welding quality and consistency; image monitoring equipment is used to monitor the formation process of the weld in real time to ensure that the shape, width and depth of the weld meet the design requirements. Through equipment such as high-definition cameras or laser scanners, the shape of the weld can be observed in real time. Especially in complex welding environments, image monitoring equipment can help operators or automation systems to promptly detect potential problems in the weld, such as uneven welding, cracks or pores, thereby reducing welding errors and ensuring the stability and accuracy of the welding process. Through the linkage of temperature sensors and image monitoring equipment, the welding process is optimized, the stability of the weld quality is ensured, human intervention is reduced, and the welding accuracy and reliability are improved.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sheet metal component butt weld joint, characterized in that: include: A flat plate member and a curling member, wherein the flat plate member is butted against the curling member, and an end of the flat plate member is extended to directly contact the bent R angle of the curling member; The butt joint forms a single-sided V-shaped welding structure, which is suitable for reducing the welding gap and preventing deformation during welding; The curling member is connected to the flat plate member by welding, wherein the thickness of the weld is close to the thickness of the parent material to ensure the structural stability of the welded joint.

2. The sheet metal component butt weld joint according to claim 1, characterized in that: The angle of the single-sided V-shaped structure is determined by the butt joint method between the flat plate component and the curling component, and is appropriately adjusted according to the required strength.

3. The sheet metal component curling butt welding joint according to claim 1, characterized in that: The bending R angle of the curling component is 2 to 3 times the thickness of the flat plate component, and a low thermal stress level is maintained after welding.

4. A process for preparing a butt welded joint of a sheet metal component, characterized in that: Using a sheet metal component curling butt welding joint as described in any one of claims 1 to 3, comprising the following steps: S1. Determine the length of the extended portion of the flat plate member by calculation so that it is in direct contact with the curling member at the bending R angle; S2. When making the blanking expansion drawing, the size of the flat plate component is adjusted accordingly to adapt to the extended design; S3, butting the adjusted flat plate member with the curled edge member to form a single-sided V-shaped welded structure by welding; S4. During the welding process, heat input is controlled to ensure that the thickness difference between the weld and the base material is minimized to reduce welding deformation.

5. A process for preparing a rolled butt welded joint of a sheet metal component according to claim 4, characterized in that: The S1 further includes: calculating the extension length of the flat plate component by software, which is specifically determined based on the numerical relationship between the bending radius of the curling component and the thickness of the sheet metal.

6. A process for preparing a sheet metal component butt weld joint according to claim 4, characterized in that: The S4 further includes: presetting the width and depth of the weld by computer-aided design to ensure accurate control of the weld size during the welding process.

7. A method for using a rolled butt weld joint of a sheet metal component, characterized in that: Using a sheet metal component curling butt welding joint as described in any one of claims 1 to 3, comprising the following steps: Determine the optimal length of the flat plate member extended to the curling edge to ensure that the two are butted together without gap at the R corner; Perform assembly checks before butting flat plate components and hemmed components to ensure alignment; Use appropriate welding techniques for welding and monitor welding temperature and weld quality through a real-time monitoring system; After welding, local heating is performed through a flame heating plate to level the slight deformation caused by welding.

8. A process for welding a sheet metal component by curling butt joint according to claim 7, characterized in that: Assembly inspection includes: Completed by an automated inspection system to ensure joint alignment accuracy within 0.1 mm.

9. A process for welding a sheet metal component by curling butt joint according to claim 7, characterized in that: Welding techniques include the use of friction stir welding to ensure minimal heat affected zone during welding.

10. A process for welding a sheet metal component by curling butt joint according to claim 7, characterized in that: The real-time monitoring system includes: temperature sensors and image monitoring equipment, which are used to monitor the welding temperature and weld formation process in real time.

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