Covered edge of part, repairing method of covered edge, automobile part and automobile

Abstract

The invention relates to the technical field of metal product repairing, and provides a covered edge of a part and a repairing method thereof, an automobile part and an automobile, and the covered edge repairing method of the part comprises the following steps that the part is obtained, the part is provided with the covered edge, and the covered edge of the part has cracks; and a welding material and a surfacing repair process are adopted to repair cracks of the covered edge, so that the welding material is filled in the cracks of the covered edge of the part, and the welding material and an edge covering material of the part belong to the same series of materials. According to the method for repairing the covered edge of the part, the precise surfacing technology and the matched welding material are utilized, the cracked part of the covered edge of the part can be effectively repaired, the original performance of a covered edge base body of the part is reserved to the maximum extent, and the part can be effectively repaired; and the covered edge of the repaired part has higher reliability and stability in the long-term use process, so that the service life of the part is effectively prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of metal product repair, and in particular relates to a hemming method of a component and a repair method thereof, an automobile component, and an automobile. Background Art

[0002] In modern industrial production, especially in the field of automobile manufacturing, hemming technology is widely used in various parts. The edges of various metal or non-metal parts of the automobile body, such as doors, hoods, trunk lids, window frames, etc., are not only made softer and smoother after hemming treatment, but also can reduce the problem of corrosion and wear on the edges, thereby effectively protecting the body structure and enhancing safety.

[0003] However, in the actual production process, the problem of edge cracking often occurs. Minor edge cracking is usually repaired by grinding, while serious cases are directly scrapped. Since the cracks at the edge are extremely small, it is difficult to accurately perform ordinary treatment methods, which is extremely difficult to operate, and the aesthetics are difficult to meet market requirements. Therefore, the existing treatment methods are difficult to meet production needs, and a more effective repair technology for automobile edge cracking is urgently needed. Summary of the invention

[0004] The purpose of the present application is to provide a component hemming and repair method thereof, an automobile component, and an automobile, aiming to solve the problems of high difficulty in repairing the existing component hemming after cracking and poor restoration effect.

[0005] In order to achieve the above application purpose, the technical solution adopted in this application is as follows:

[0006] In a first aspect, the present application provides a method for repairing the hemming of a component, comprising the following steps:

[0007] Obtain a component, the component has an edge, and the edge of the component has a crack;

[0008] The cracks in the hemming are repaired by using welding materials and surfacing repair technology, so that the welding materials are filled in the cracks in the hemming of the parts. The welding materials and the hemming materials of the parts are of the same series.

[0009] In some embodiments, the welding material includes a 6xxx series aluminum alloy material.

[0010] In some embodiments, the welding material includes at least one of 6016 aluminum alloy, 6063 aluminum alloy, and 6014 aluminum alloy.

[0011] In some embodiments, the welding material includes aluminum, silicon and magnesium. Based on the total mass of the welding material, the content of the aluminum is ≥95%, the content of the silicon is 0.2%-1.5%, and the content of the magnesium is 0.25%-1%.

[0012] In some embodiments, the welding material further comprises iron, copper, manganese, chromium and zinc. Based on the total mass of the welding material, the content of the iron element is ≤0.4%, the content of the copper element is ≤0.2%, the content of the manganese element is 0.25%-0.9%, the content of the chromium element is 0.04%-0.14%, and the content of the zinc element is ≤0.2%.

[0013] In some embodiments, the welding material is in the shape of a welding wire, and the diameter of the welding wire is 1 mm-3 mm.

[0014] In some embodiments, the crack size of the above-mentioned hemming is: the crack width is less than or equal to 1 mm, and the crack length is 2 mm-10 mm.

[0015] In some embodiments, the above-mentioned surfacing welding includes electric spark surfacing welding, and the conditions of the electric spark surfacing welding include: frequency of 160Hz-180Hz, voltage of 45V-55V, power of 400W-500W, and rotation speed of 12RPM-22RPM.

[0016] In some embodiments, the above-mentioned surfacing is performed under a protective atmosphere, and the conditions of the gas forming the above-mentioned protective atmosphere include: a gas flow rate of 0.4-0.5 mL / min, and a gas pressure of 7 Mpa-8 Mpa.

[0017] In some embodiments, the above repair method further includes the following steps:

[0018] The edges of the parts repaired by cladding are ground and / or surface painted.

[0019] In a second aspect, the present application provides an edge wrapping of a component, wherein the edge wrapping of the component is repaired by using the edge wrapping repairing method of the component provided in the first aspect;

[0020] The cracks in the hemming of the above-mentioned component are filled with welding material, and the above-mentioned welding material and the hemming material of the above-mentioned component are of the same series of materials.

[0021] In a third aspect, the present application provides an automobile component, including the edging of the component provided in the second aspect.

[0022] In a fourth aspect, the present application provides an automobile, including the edging of the parts provided in the second aspect or the automobile parts provided in the third aspect.

[0023] The first aspect of the present application provides a method for repairing the hemming of a component, which utilizes the high precision of the surfacing technology to produce limited heat only on the cracked portion of the hemming of the component and its extremely small surrounding area, so that the welding material with higher adaptability can melt and fill in the cracks in the hemming of the component at a faster rate, thereby effectively repairing the cracked portion of the hemming of the component. This not only retains the original performance of the hemming matrix of the component to the greatest extent, so that the hemming of the repaired component has higher reliability and stability during long-term use, thereby effectively extending the service life of the component, but also effectively improves the structural integrity and functionality of the component, thereby effectively avoiding the situation where the entire component is forced to be scrapped due to the defect of local hemming cracking, thereby reducing production costs and waste of resources; in addition, since the heat affected zone of the surfacing is small, it is not easy to cause large-scale deformation, discoloration or surface roughening of the component during the repair process, and it is easy to accurately restore it to the original undamaged state, which helps to improve the consistency and aesthetics of the appearance of the entire component, and meet the product appearance quality standards and customer visual requirements.

[0024] The edging of the parts provided in the second aspect of the present application is repaired by the repair method provided in the first aspect, so that the appearance quality of the edging containing the parts is basically consistent with the initial undamaged state, which helps to reduce the problem of parts being scrapped due to cracking of the edging.

[0025] The automobile component provided in the third aspect of the present application, because it contains the edging of the component provided in the second aspect, not only makes the appearance quality of the automobile component basically the same as the original state, but also can effectively restore its structural integrity and stability, so that the automobile can operate normally and withstand the test of long-term use, thereby enhancing the overall reliability of the automobile.

[0026] The automobile provided in the fourth aspect of the present application contains the edging of the parts provided in the second aspect or the automobile parts provided in the third aspect. The edging of the repaired parts can restore their functions and structural strength, thereby extending the service life of the automobile and improving the driving experience. At the same time, this also helps to reduce the cost of automobile maintenance and replacement of parts, and can maintain the perfect appearance of the automobile, so that the automobile has a higher value and a better brand image. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1This is a physical picture of the aluminum door outer panel corresponding to the hemming repair process of the parts provided in Example 1 of the present application;

[0029] Figure 2 This is a physical picture of the aluminum door outer panel corresponding to the hemming repair process of the parts provided in Example 2 of the present application;

[0030] Figure 3 This is a physical picture of the aluminum door outer panel corresponding to the hemming repair process of the parts provided in Example 3 of the present application;

[0031] Figure 4 This is a real picture of the aluminum door outer panel after painting provided in Example 3 of the present application. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0034] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.

[0035] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0036] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0037] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0038] The term "6xxx alloy", referred to as 6 series aluminum alloy, is an aluminum alloy with silicon (Si) and magnesium (Mg) as the main alloying elements.

[0039] In modern industrial production, especially in the field of automobile manufacturing, the hemming process is widely used in various parts, such as automobile hoods, door panels, and rear covers. However, in the actual production process, the hemming part of the parts may crack due to external impact, long-term vibration, material fatigue or processing defects. For minor hemming cracks, the grinding process is usually used, but it still faces many difficult difficulties. First, the cracks at the hemming cracks are extremely small, with a width of usually less than 1mm and a length of 2-10mm. The thickness of the sheet metal is only about 1mm, which makes it difficult to accurately perform ordinary processing methods and the operation is extremely difficult. Second, in the subsequent production process, the parts will be coated such as electrophoresis and spray painting. This requires that during the baking process, the material used to repair the hemming cracks needs to fully consider its expansion characteristics during baking and its bonding strength with the original aluminum plate, otherwise it is easy to cause the repair part to be incompatible with the overall structure, thereby affecting the product quality. Third, given the nature of the product, it has extremely strict requirements on the overall appearance of the parts. Even minor repair defects may cause the product appearance to not meet the standards and reduce the product's market competitiveness.

[0040] The cladding process is a metal surface modification technology. It deposits a layer of material with specific properties on the surface of the metal substrate by welding. It often focuses on the repair of large components, such as mining machinery, ship propellers, etc. The structure of these large components is relatively simple and extensive, and the requirements for repair accuracy and appearance are not the same as those for automobile hemming. The cladding process has not been included in the consideration of automobile hemming repair methods for a long time. This is mainly based on the characteristics of automobile hemming itself. First, its structure is complex and changeable, with fine bends, corners and transition areas of different thicknesses; second, the particularity of automobile hemming materials is also an important factor. The welding materials commonly used in the cladding process and the automobile hemming materials have significant differences in chemical composition, crystal structure and physical properties. Therefore, when performing cladding repair, the incompatibility of this material will cause a series of problems. For example, due to the difference in thermal expansion coefficients, huge thermal stress will be generated between the cladding layer and the hemming substrate during the cooling process after cladding, which can easily lead to crack initiation and expansion in the repaired part. Not only can the hemming crack not be effectively repaired, but it may aggravate the degree of damage.

[0041] Based on this, a first aspect of an embodiment of the present application provides a method for repairing the hemming of a component, comprising the following steps:

[0042] Step S10, obtaining a component, wherein the component has an edge, and the edge of the component has cracks;

[0043] Step S20: Use welding materials and surfacing repair process to repair the cracks of the hemming, so that the welding material fills the cracks of the hemming of the component, and the welding material and the hemming material of the component are of the same material.

[0044] The first aspect of the embodiment of the present application provides a method for repairing the hemming of a component, which utilizes the high precision of the surfacing technology to produce limited heat only on the cracked part of the hemming of the component and its extremely small surrounding area, so that the welding material with higher adaptability can melt and fill in the cracks in the hemming of the component at a faster rate, thereby effectively repairing the cracked part of the hemming of the component. This not only retains the original performance of the hemming matrix of the component to the greatest extent, so that the hemming of the repaired component has higher reliability and stability during long-term use, thereby effectively extending the service life of the component, but also effectively improves the structural integrity and functionality of the component, thereby effectively avoiding the situation where the entire component is forced to be scrapped due to the defect of local hemming cracking, thereby reducing production costs and waste of resources; in addition, since the heat affected zone of the surfacing is small, it is not easy to cause large-scale deformation, discoloration or surface roughening of the component during the repair process, and it is easy to accurately restore it to the original undamaged state, which helps to improve the consistency and aesthetics of the appearance of the entire component, and meet the product appearance quality standards and customer visual requirements.

[0045] In some embodiments, in step S10, the crack size of the hemming is: the maximum crack width is less than or equal to 1 mm, and the crack length is 2 mm-10 mm.

[0046] The crack width is measured perpendicular to the crack extension direction using specific measuring tools and methods, such as placing the cracked part of the hemming of a component under a microscope to measure the crack width. Since the crack may be an irregular shape, the crack width here refers to the maximum width of the crack.

[0047] The crack length refers to the straight-line distance from the starting point to the end point of the crack on the hemming surface of the component. In actual measurement, when the crack is straight, the distance between the two end points can be directly measured; if the crack is curved or irregular, the length is usually determined by measuring the crack along the crack trajectory and then summing it up. The measurement is generally in millimeters (mm).

[0048] Since the size of the crack is small, the surfacing method adopted in the embodiment of the present application can accurately repair the cracks on the edge of the component according to the specific situation. Only simple grinding, polishing, painting and other treatments are required after the repair, so that the repaired part and the surrounding edge surface can achieve good flatness and smoothness, meeting the requirements of automobile appearance and assembly.

[0049] In some embodiments, in step S20, the welding material and the edging material of the component are of the same material series.

[0050] In the technical solution of the present application, since the welding material and the edging material of the component are of the same series, during the welding process, the welding material becomes liquid at high temperature. The fluidity of the liquid metal is used to fill the welding material in the cracks of the edging of the component, thereby effectively repairing the cracks in the edging of the component. Therefore, a welding material of the same series as the edging of the component is selected. When the welding material melts and contacts the edging, the similar chemical composition enables them to better diffuse and fuse with each other at the atomic level, so that the alloy elements can be evenly distributed, so that the same series of materials can achieve better metallurgical bonding, so that the welding material and the edging of the component form a tight connection, giving the welding material and the edging of the component a higher bonding force, thereby improving the repair quality; at the same time, since the welding material and the edging material of the component are of the same series, it is easier to maintain consistency in appearance and match performance of the repaired component, so that the repaired component can meet the requirements during actual use.

[0051] It can be understood that homologous materials refer to a series of materials that have similarities and connections in chemical composition, crystal structure or physical properties. These materials usually belong to the same material family and are a collection of materials formed due to the gradual replacement of chemical elements, similar changes in crystal structure or the coherent evolution of physical properties.

[0052] Homogeneous materials have similar chemical compositions. For example, the edging material of a component is 6xxx alloy (6 series aluminum alloy), and the welding material is also 6xxx alloy (6 series aluminum alloy). For example, the edging material of a component is low carbon steel, and the welding material is also low carbon steel.

[0053] The welding material and the edging material of the parts belong to the same series of materials, but the welding material and the edging material of the parts can be of the same grade, that is, the welding material and the edging material of the parts contain the same type of elements and the same element composition, or they can be of the same series but different grades of materials, that is, the welding material and the edging material of the parts contain at least one different type of elements and element composition. For example, the edging material of the parts and the welding material are both 6xxx alloys, the edging material of the parts is 6014 aluminum alloy, and the welding material is 6063 aluminum alloy.

[0054] In some embodiments, in step S20, the welding material includes a 6xxx series aluminum alloy material.

[0055] Using 6 series aluminum alloy that is consistent with the edging material of the component means that the welding material and the edging of the component have similar alloy element composition. This similarity makes it easier for atoms to diffuse between the welding material and the edging of the component during the welding process, so that a uniform alloy transition zone can be quickly formed, which helps to improve metallurgical bonding.

[0056] In some embodiments, in step S20, the welding material includes at least one of 6016 aluminum alloy, 6063 aluminum alloy, and 6014 aluminum alloy.

[0057] 6016 aluminum alloy, 6063 aluminum alloy, and 6014 aluminum alloy are all 6xxx alloys.

[0058] On the one hand, these welding materials have high metallurgical compatibility and are more likely to form high-quality welding areas. Moreover, their thermophysical properties match those of the substrate, so that the shrinkage degree of the welding materials and the edging substrate of the parts is close, and thermal stress is not easily generated, thereby further improving the welding quality. On the other hand, these welding materials have high strength and good toughness, which is beneficial to improving the structural stability of repaired automotive parts. On the other hand, these welding materials are not prone to obvious color differences or material differences, which plays a significant positive role for products such as automobiles that have high requirements for appearance quality, thereby helping to maintain the neat and beautiful appearance of the automobile and meet the product's appearance quality standards and customer visual requirements.

[0059] In some embodiments, in step S20, the welding material includes aluminum, silicon and magnesium. Based on the total mass of the welding material, the content of the aluminum is ≥95%, the content of the silicon is 0.2%-1.5%, and the content of the magnesium is 0.25%-1%.

[0060] For example, the content of aluminum element may be 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99% and other typical but non-limiting values.

[0061] Exemplarily, the silicon content can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5% and other typical but non-limiting values.

[0062] For example, the content of magnesium may be 0.25%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% and other typical but non-limiting values.

[0063] Controlling the silicon content in the welding material within the above range can effectively improve the fluidity of the welding material. Therefore, during the welding process, the appropriate silicon content can make the liquid welding material easier to fill cracks and improve the welding quality. At the same time, the appropriate silicon content can form a strengthening phase, such as Mg2Si phase, thereby effectively improving the strength of the welding material, such as tensile strength and high temperature strength.

[0064] Controlling the magnesium content in the welding material within the above range can achieve grain refinement and make the organizational structure of the welding material more uniform, thereby effectively dispersing stress, preventing the generation and expansion of cracks, and significantly improving the toughness of the welding material.

[0065] In addition, appropriate silicon and magnesium contents help to improve the corrosion resistance of welding materials. Specifically, magnesium can form a dense oxide film on the surface of welding materials. At the same time, silicon can improve the structure and performance of the oxide film, making it more stable and continuous. This good corrosion resistance can extend the service life of the edging of parts and maintain the beauty of the car's appearance.

[0066] In some embodiments, in step S20, the welding material further includes iron, copper, manganese, chromium and zinc. Based on the total mass of the welding material, the content of the iron element is ≤0.4%, the content of the copper element is ≤0.2%, the content of the manganese element is 0.25%-0.9%, the content of the chromium element is 0.04%-0.14%, and the content of the zinc element is ≤0.2%.

[0067] For example, the content of iron may be 0.4%, 0.35%, 0.3%, 0.25%, 0.2%, 0.15%, 0.1%, 0.05% and other typical but non-limiting values.

[0068] For example, the content of copper element may be 0.2%, 0.15%, 0.1%, 0.05% and other typical but non-limiting values.

[0069] For example, the content of manganese element may be 0.25%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% and other typical but non-limiting values.

[0070] For example, the content of chromium can be 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.11%, 0.12%, 0.13%, 0.14% and other typical but non-limiting values.

[0071] For example, the content of zinc element may be 0.2%, 0.15%, 0.1%, 0.05% and other typical but non-limiting values.

[0072] By controlling the content of each element within the above range, an appropriate content of copper can improve the strength, fluidity and corrosion resistance of the welding material, making it easier for the liquid welding material to fill cracks and improve the welding quality; an appropriate content of manganese can improve the strength and toughness of the welding material, and can significantly refine the crystal grains, making the organizational structure of the welding material more uniform, and promoting the improvement of welding quality; an appropriate content of chromium can effectively improve the strength and hardness of the welding material, and play a certain positive role in fluidity and stability, so that the welding material can better fill the edge cracks of the parts after melting; an appropriate content of zinc has a certain contribution to the strength, fluidity and corrosion resistance of the welding material, so that the melted welding material can more easily fill cracks and improve the welding quality.

[0073] In some embodiments, in step S20, the welding material is in the shape of a welding wire, and the diameter of the welding wire is 1 mm-3 mm. For example, the diameter of the welding wire can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., which are typical but non-limiting values.

[0074] Controlling the diameter of the welding wire within the above range means that the heat input required for cladding is relatively low. Low heat input can prevent the performance degradation of the cladding material due to overheating. At the same time, low heat input can also reduce the risk of welding deformation, so that the repaired cladding can better maintain its original performance and appearance.

[0075] In addition, welding wires with suitable diameters can more accurately fill in tiny cracks or gaps in the edging of parts during the cladding process, making the repaired surface smoother and flatter, minimizing repair marks and ensuring appearance quality. Moreover, welding wires with suitable diameters can quickly deposit welding materials to the repaired area during the cladding process, increasing the deposition rate of welding materials, thereby improving repair efficiency and shortening repair time.

[0076] In some embodiments, in step S20, the surfacing welding includes electric spark surfacing welding, and the conditions of the electric spark surfacing welding include: a frequency of 160 Hz-180 Hz, a voltage of 45 V-55 V, a power of 400 W-500 W, and a rotation speed of 12 RPM-22 RPM.

[0077] For example, the frequency of the electric spark surfacing may be 160 Hz, 162 Hz, 165 Hz, 168 Hz, 170 Hz, 172 Hz, 175 Hz, 178 Hz, 180 Hz, etc., which are typical but non-limiting values.

[0078] Exemplarily, the voltage of the electric spark surfacing may be 45V, 46V, 47V, 48V, 49V, 50V, 51V, 52V, 53V, 54V, 55V, etc., which are typical but non-limiting values.

[0079] For example, the power of the electric spark surfacing may be 400 W, 410 W, 420 W, 430 W, 440 W, 450 W, 460 W, 470 W, 480 W, 490 W, 500 W, etc., which are typical but non-limiting values.

[0080] Exemplarily, the rotation speed of the electric spark surfacing can be typical but non-limiting values ​​such as 12RPM, 13RPM, 14RPM, 15RPM, 16RPM, 17RPM, 18RPM, 19RPM, 20RPM, 21RPM, 22RPM, etc.

[0081] The frequency of electric spark surfacing is controlled within the above range so that the welding material can be melted and deposited on the repaired part of the hemming of the component in a shorter time, thereby achieving rapid melting and fine deposition of the welding material, shortening the repair time, and making the hemming surface of the repaired component smoother.

[0082] Controlling the power of electric spark surfacing within the above range can not only make the welding material fully melt and well bonded with the base material, but also effectively control the size of the heat affected zone and reduce the transfer of heat to the surrounding materials, thereby preventing damage to other components or changes in material properties caused by thermal effects.

[0083] The voltage of electric spark cladding is controlled within the above range to form a stable discharge channel between the welding material and the edge of the component, so that the welding material is melted and deposited in a predetermined manner, thereby improving the repeatability of the repair quality; moreover, the appropriate voltage can effectively adjust the transition mode of the welding material molten droplet, making the molten droplet transition relatively smooth, thereby helping to achieve fine repair of the edge of the component, making it easier to maintain consistency in quality and appearance of the edge of the repaired component.

[0084] By controlling the rotation speed of the electric spark cladding within the above range, the welding material can be more evenly distributed on the repaired part of the hemming of the component during the deposition process, promoting the uniform fusion of the welding material and the hemming base material of the component, improving the welding quality, and reducing the problem of uneven accumulation of welding materials. This will help to make the thickness and quality of the hemming surface of the component more uniform, so as to better meet the appearance and performance requirements of the automobile.

[0085] In some embodiments, in step S20, the conditions of the above-mentioned electric spark welding include: frequency of 170 Hz, voltage of 50 V, power of 500 W, and rotation speed of 20 RPM.

[0086] In some embodiments, in step S20, the above-mentioned surfacing is performed under a protective atmosphere, and the conditions of the gas forming the above-mentioned protective atmosphere include: a gas flow rate of 0.4-0.5 mL / min, and a gas pressure of 7 Mpa-8 Mpa.

[0087] Exemplarily, the protective atmosphere includes, but is not limited to, at least one of argon and helium.

[0088] Exemplarily, the gas flow rate can be typical but non-limiting values ​​such as 0.4 mL / min, 0.41 mL / min, 0.42 mL / min, 0.43 mL / min, 0.44 mL / min, 0.45 mL / min, 0.46 mL / min, 0.47 mL / min, 0.48 mL / min, 0.49 mL / min, 0.5 mL / min, etc.

[0089] Exemplarily, the gas pressure may be 7V, 7.1V, 7.2V, 7.3V, 7.4V, 7.5V, 7.6V, 7.7V, 7.8V, 7.9V, 8V, etc., which are typical but non-limiting values.

[0090] During the cladding process, high temperature will make the metal elements in the welding material react easily with oxygen in the air, leading to oxidation. Therefore, the use of a protective atmosphere can isolate the air and prevent oxygen from contacting the welding area, thereby preventing the metal from being oxidized, thereby improving the chemical composition and performance stability of the welding area and improving the quality of the repair.

[0091] In some embodiments, the above repair method further includes the following steps:

[0092] Step S30, grinding and / or surface coating the edges of the parts after the surfacing welding repair.

[0093] After grinding, on the one hand, the edging of parts can become flat and smooth, which plays a positive role in improving the appearance quality of the edging of parts and the sealing and aesthetics of the overall structure. On the other hand, the surface roughness of the edging of parts can be adjusted, which is helpful for subsequent painting treatment so that the paint can better adhere to its surface; on the other hand, the size of the edging of parts can be fine-tuned to ensure that it meets the design requirements, thereby improving its close fit with other parts and improving the overall assembly quality of the car.

[0094] The grinding process may adopt a grinding method well known in the art, and the grinding tools used include but are not limited to sandpaper, grinding discs, grinders, etc.

[0095] For example, sandpaper is used for grinding. Sandpaper with a coarser grain size (such as 80-120 mesh) can be used for rough grinding first, and then sandpaper with a finer grain size (such as 240-320 mesh) can be used for fine grinding to make the surface smoother.

[0096] The surface coating treatment can adopt coating methods well known in the art, such as spray painting and electrophoresis treatment.

[0097] The spraying process is to spray the paint onto the hemming surface of the parts by atomizing the paint with a spray gun. The paint forms a thin film on the hemming surface, and the solvent evaporates and solidifies to form a coating.

[0098] Electrophoretic treatment is an electrochemical deposition process. The edge of the repaired parts is immersed in an electrophoretic tank containing electrophoretic paint (mainly water-based paint) as the cathode. Under the action of direct current, the resin particles in the paint are charged, move to the edge surface and deposit to form a coating.

[0099] In a second aspect, the present application provides an edge wrapping of a component, the edge wrapping of a component repaired according to the method for repairing cracked edge wrapping of a component provided in the first aspect;

[0100] The cracks in the hemming of the above-mentioned component are filled with welding material, and the above-mentioned welding material and the hemming material of the above-mentioned component are of the same series of materials.

[0101] Due to the repair by the repair method provided in the first aspect, the appearance quality of the hemming containing the parts is basically consistent with the initial undamaged state, which helps to reduce the problem of parts being scrapped due to cracking of the hemming.

[0102] In a third aspect, the present application provides an automobile component, including the edging of the component provided in the second aspect.

[0103] Due to the edging of the repaired parts provided by the first aspect, not only the appearance quality of the automobile parts is basically the same as the original state, but also its structural integrity and stability can be effectively restored, so that the automobile can operate normally and withstand the test of long-term use, thereby enhancing the overall reliability of the automobile.

[0104] In a fourth aspect, the present application provides an automobile, including the edging of the parts provided in the second aspect or the automobile parts provided in the third aspect.

[0105] Due to the edging of the parts provided by the second party or the automobile parts provided by the third party, the edging of the repaired parts can restore their functions and structural strength, thereby extending the service life of the automobile and improving the driving experience. At the same time, this also helps to reduce the cost of automobile maintenance and replacement of parts, and can maintain the perfect appearance of the automobile, making the car have a higher value and a better brand image.

[0106] In order to enable those skilled in the art to clearly understand the above implementation details and operations of the present application, the above technical solution is illustrated by means of multiple embodiments below.

[0107] Example 1

[0108] This embodiment provides a method for repairing the hemming of a component, comprising the following steps:

[0109] Step 1. Provide a component with hemming cracks, specifically an aluminum door outer panel (6014 aluminum alloy) that has cracks during the hemming process, with a maximum crack width of 260 μm and a crack depth of 410 μm. Select a suitable welding material based on the collected characteristic information: 6063 welding wire (welding wire made of grade 6063 aluminum alloy) with a diameter of 2 mm.

[0110] Step 2: Fix the aluminum door outer panel in the fixture, turn on the electric spark cladding equipment, set the parameters: frequency is 170Hz, voltage is 50V, power is 500W, and speed is 20RPM. When the electric spark cladding equipment starts to discharge, the welding wire is slowly fed into the crack through the wire feeding mechanism, so that the welding material melts during the welding process and fills the edge crack. After the cladding is completed, turn off the equipment.

[0111] Step 3: Use a grinding disc to grind the repaired edge. The grinding conditions are: first at 1500RPM for 10 minutes, and then at 1000RPM for 30 minutes.

[0112] Figure 1 This is a physical picture of the aluminum door outer panel corresponding to the edge repair process of the parts in this embodiment. Figure 1 A in the figure is a schematic diagram of the aluminum door outer panel before repair (corresponding to step 1), specifically, there are obvious cracks in the edge of the aluminum door outer panel; Figure 1 Figure B is a schematic diagram of the aluminum door outer panel after repair by electric spark surfacing welding (corresponding to step 2), and it can be seen that the crack has been effectively filled; Figure 1 Figure C is a schematic diagram of the aluminum door outer panel after polishing (corresponding to step 3). It can be seen that the edge corners are rounded and the surface is smooth.

[0113] Example 2

[0114] This embodiment provides a method for repairing the hemming of a component, comprising the following steps:

[0115] Step 1: Provide a component with hemming cracks, specifically a 6014 aluminum alloy aluminum door outer panel with cracks during the hemming process, with a maximum crack width of 230 μm and a crack depth of 362 μm. Select an appropriate welding material 6063 welding wire (welding wire made of grade 6063 aluminum alloy) with a diameter of 1 mm based on the collected characteristic information.

[0116] Step 2: Fix the aluminum door outer panel in the fixture, turn on the electric spark cladding equipment, set the parameter frequency to 180Hz, voltage to 45V, power to 400W, and speed to 18RPM. When the electric spark cladding equipment starts to discharge, slowly feed the welding wire into the crack through the wire feeding mechanism, so that the welding material melts during the welding process and fills the edge crack. After the cladding is completed, turn off the equipment.

[0117] Step 3: Use a grinding disc to grind the repaired edge. The grinding conditions are: first at 1500RPM for 10 minutes, and then at 1000RPM for 30 minutes.

[0118] Figure 2 This is a physical picture of the aluminum door outer panel corresponding to the edge repair process of the parts in this embodiment. Figure 2 A in the figure is a schematic diagram of the aluminum door outer panel before repair (corresponding to step 1), specifically, there are obvious cracks in the edge of the aluminum door outer panel; Figure 2 Figure B is an enlarged image of the aluminum door outer panel under a microscope before repair. The cracks in the hemming can be clearly seen, and the size of the cracks can be measured (corresponding to step 1); Figure 2 Figure C is an enlarged image of the aluminum door outer panel after polishing under a microscope (corresponding to step 3). It can be clearly seen that the cracks have been effectively filled, and the edging surface is smooth and has no defects in appearance.

[0119] Example 3

[0120] This embodiment provides a method for repairing the hemming of a component, comprising the following steps:

[0121] Step 1: Provide a component with hemming cracks, specifically a 6014 aluminum alloy aluminum door outer panel with cracks during the hemming process, with a maximum crack width of 200 μm and a crack depth of 350 μm. Select an appropriate welding material 6016 welding wire (welding wire made of grade 6016 aluminum alloy) with a diameter of 1 mm based on the collected characteristic information.

[0122] Step 2: Fix the aluminum door outer panel in the fixture, turn on the electric spark cladding equipment, set the parameters: frequency is 160Hz, voltage is 55V, power is 450W, speed is 12RPM. When the electric spark cladding equipment starts to discharge, the welding wire is slowly fed into the crack through the wire feeding mechanism, so that the welding material melts during the welding process and fills the edge crack. After the cladding is completed, turn off the equipment.

[0123] Step 3: Use a grinding disc to grind the repaired edge. The grinding conditions are: first at 1500RPM for 10 minutes, and then at 1000RPM for 30 minutes.

[0124] Step 4: Perform electrophoresis on the polished edge. The electrophoresis process is as follows:

[0125] Use alkaline degreasing agent to degrease the aluminum door outer panel edge at 50℃ for 3 minutes;

[0126] Use a passivating agent (chromate) to passivate the edge of the aluminum door outer panel;

[0127] The temperature of the electrophoresis tank liquid was controlled at about 25°C, and water-based epoxy electrophoresis coating (solid content of 50%) was used for electrophoresis at about 180V for 3 minutes;

[0128] The edge of the aluminum door outer panel is cleaned and then cured at 160°C for 20 minutes to form a coating.

[0129] Figure 3 This is a physical picture of the aluminum door outer panel corresponding to the edge repair process of the parts in this embodiment. Figure 3 A in the figure is a schematic diagram of the aluminum door outer panel before repair (corresponding to step 1), specifically, there are obvious cracks in the edge of the aluminum door outer panel; Figure 3 B is a schematic diagram of the aluminum door outer panel after repair by electric spark surfacing welding. It can be seen that the crack has been effectively filled (corresponding to step 2); Figure 3 Figure C is a schematic diagram of the aluminum door outer panel after grinding (corresponding to step 3). It can be seen that the edge fillet is rounded and the surface is smooth, which is basically consistent with the appearance of normal parts.

[0130] Figure 4 This is a physical picture of the aluminum door outer panel corresponding to the electrophoretic treatment of the edging of the parts of this embodiment (corresponding to step 4). It can be seen that the paint film formed after the electrophoretic treatment has a good appearance, basically no surface defects, and a high aesthetics.

[0131] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for repairing the hemming of a component, characterized in that: The following steps are involved: Obtain a component, wherein the component has an edge, and the edge of the component has a crack; The cracks of the hemming are repaired by using welding materials and a surfacing repair process, so that the welding material fills the cracks of the hemming of the component, and the welding material and the hemming material of the component belong to the same series of materials.

2. The method for repairing the hemming of a component according to claim 1, characterized in that: The welding material includes 6xxx series aluminum alloy material.

3. The method for repairing the hemming of a component according to claim 2, characterized in that: The welding material includes at least one of 6016 aluminum alloy, 6063 aluminum alloy and 6014 aluminum alloy.

4. The method for repairing the hemming of a component according to claim 1, characterized in that: The welding material comprises aluminum, silicon and magnesium. Based on the total mass of the welding material, the content of the aluminum is ≥95%, the content of the silicon is 0.2%-1.5%, and the content of the magnesium is 0.25%-1%.

5. The method for repairing the hemming of a component according to claim 4, characterized in that: The welding material further comprises iron, copper, manganese, chromium and zinc. Based on the total mass of the welding material, the content of the iron element is ≤0.4%, the content of the copper element is ≤0.2%, the content of the manganese element is 0.25%-0.9%, the content of the chromium element is 0.04%-0.14%, and the content of the zinc element is ≤0.2%.

6. The method for repairing the hemming of a component according to claim 1, characterized in that: The welding material comprises welding wire, the diameter of the welding wire is 1 mm-3 mm; and / or, The crack size of the hemming is: the maximum crack width is less than or equal to 1mm, and the crack length is 2mm-10mm.

7. The component hemming repair method according to any one of claims 1 to 6, characterized in that: The surfacing welding repair process is carried out using an electric spark surfacing welding repair equipment, and the working parameters of the electric spark surfacing welding repair equipment include: frequency of 160Hz-180Hz, voltage of 45V-55V, power of 400W-500W, and rotation speed of 12RPM-22RPM.

8. The method for repairing the hemming of a component according to claim 7, characterized in that: The surfacing welding repair process is carried out under a protective atmosphere, and the conditions of the gas forming the protective atmosphere include: a gas flow rate of 0.4-0.5 mL / min and a gas pressure of 7 Mpa-8 Mpa.

9. The component hemming repair method according to any one of claims 1 to 6, characterized in that: The repair method further comprises the following steps: The edges of the parts after the surfacing welding repair process are polished and / or surface-painted.

10. A component with hemming, characterized in that: The hemming of the component is repaired by using the hemming repair method of the component according to any one of claims 1 to 9; The cracks in the hemming of the component are filled with welding material, and the welding material and the hemming material of the component are of the same series.

11. An automobile component, characterized in that: The invention comprises the component with hemming as claimed in claim 10.

12. A car, characterized in that: The invention comprises the component with hemming as claimed in claim 10 or the automobile component as claimed in claim 11.

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