Cold spray repair equipment and method for large aluminum-magnesium alloy complex structural parts for automobiles

Abstract

The present invention provides a cold spray repair device and method for large aluminum-magnesium alloy complex structural parts for automobiles, which relates to the technical field of cold spray repair of automobile castings, wherein the repair device includes a trimming machine and a hopper for accommodating trimmings, and an image acquisition component transmits the acquired structural part image to a control center to judge defective structural parts and obtain defect information of the defective structural parts, and part of the trimmings in the hopper are sent to a two-stage crusher through a first production line, and the two-stage crusher crushes the trimmings according to the defect information to obtain a target particle size powder corresponding to the defect information; the repair nozzle uses the target particle size powder to cold spray repair the defective structural parts. The present invention utilizes trimmings to crush part of the trimmings in the hopper through a two-stage crusher, and the crushing process produces a target particle size powder corresponding to the defect according to the defect information obtained by the defect judgment unit, thereby realizing internal powder preparation, no longer relying on external purchases, and improving the repair effect.

Description

Technical Field

[0001] The invention relates to the technical field of cold spray repair of automobile castings, and in particular to a device and a method for cold spray repair of large aluminum-magnesium alloy complex structural parts for automobiles. Background Art

[0002] With the continuous development of the automobile industry, the requirements for automobile lightweighting are getting higher and higher. Aluminum-magnesium alloys are widely used in the manufacture of large and complex automotive structural parts due to their low density and high strength. However, in the die-casting process, due to the complexity and uncertainty of the process, some defective structural parts often appear. As an emerging surface repair technology, cold spraying technology has the advantages of high bonding strength between the coating and the substrate and a small heat-affected zone, and is gradually gaining attention in the automotive field.

[0003] However, in the existing technology, the application of cold spray repair technology in large aluminum-magnesium alloy complex structural parts for automobiles often requires purchasing the powder required for repair from outside. Due to different production or purchasing channels, these powders may have poor compatibility with the large aluminum-magnesium alloy complex structural parts for automobiles produced by this production line, resulting in poor repair effect on defective parts, and the quality after repair is less consistent with the original structural parts. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present invention aims to provide a cold spray repair device and method for large aluminum-magnesium alloy complex structural parts for automobiles, so as to improve the effect of cold spray repair of automobile castings.

[0005] In the first aspect, the present invention provides a cold spray repair device for a large aluminum-magnesium alloy complex structural part for automobiles, which is arranged on one side of a die-casting unit for die-casting a large aluminum-magnesium alloy complex structural part for automobiles; comprising:

[0006] A trimming unit, the trimming unit comprising a trimming machine for trimming the structural parts, and a hopper for accommodating trimming materials formed after trimming, the structural parts comprising good structural parts and defective structural parts;

[0007] A defect determination unit, the defect determination unit includes an image acquisition component, the image acquisition component is used to acquire an image of a structural part after trimming, and transmit it to a control center, the control center is used to determine whether the structural part is a defective structural part according to the image of the structural part, and if so, obtain defect information of the defective structural part, the defect information at least includes a defect position, a defect type and a defect size; the control center is also used to obtain target particle size information according to the defect information of a plurality of defective structural parts, the target particle size information includes at least one target particle size;

[0008] A pulverizing unit, the pulverizing unit comprising a two-stage pulverizer, part of the side material in the hopper can be fed into the two-stage pulverizer through the first production line, and the two-stage pulverizer is used to pulverize the side material sent from the first production line according to the target particle size information to obtain a target particle size powder corresponding to the target particle size information;

[0009] A repair unit, comprising a repair platform and a repair nozzle connected to the two-stage pulverizer, wherein the repair platform is used to carry the defective structural part, and the repair nozzle is used to perform cold spray repair on the defective structural part using the target particle size powder.

[0010] According to the technical solution provided by the present invention, it also includes a furnace connected to the die-casting unit, and another part of the edge material in the hopper can be sent to the furnace for melting through a second production line, and the obtained molten liquid is sent back to the die-casting unit.

[0011] According to the technical solution provided by the present invention, it also includes a finished product conveyor belt and a grabbing robot arm arranged on one side of the finished product conveyor belt, the finished product conveyor belt is used to convey the structural parts after trimming by the trimming unit, and the grabbing robot arm is provided with the image acquisition component.

[0012] According to the technical solution provided by the present invention, the finished product conveyor belt has a good product storage area on the side away from the grabbing robot arm, and the grabbing robot arm grabs the determined good structural parts to the good product storage area, and grabs the determined defective structural parts to the repair station.

[0013] According to the technical solution provided by the present invention, the repair nozzle is a Laval nozzle structure, and the repair unit also includes a powder acceleration component connected to the Laval nozzle structure, and the powder acceleration component is used to accelerate the target particle size powder to a target injection speed. After reaching the target injection speed, the target particle size powder is ejected from the Laval nozzle structure.

[0014] According to the technical solution provided by the present invention, a screening component is further provided between the powder acceleration component and the two-stage pulverizer, and the screening component is used to screen the initial powder obtained by the two-stage pulverizer to obtain the powder of the target particle size.

[0015] According to the technical solution provided by the present invention, it also includes a recovery unit, which is used to recover the target particle size powder remaining on the repair table after the repair is completed on the repair table.

[0016] In a second aspect, the present invention provides a method for cold spray repairing a large aluminum-magnesium alloy complex structural part for automobiles, which is implemented based on the cold spray repairing device for large aluminum-magnesium alloy complex structural part for automobiles as described above, and comprises the following steps:

[0017] Acquire the defect information of each defective structural part formed by die casting in the current production cycle, and obtain the first particle size of the powder required for cold spray repair of each defective structural part according to the defect information;

[0018] Dividing all the defective structural parts into several repair categories, wherein the first particle sizes of the defective structural parts in the same repair category are the same;

[0019] The first particle size corresponding to the repair category with the largest number of defective structural parts among all the repair categories is used as the first target particle size;

[0020] The hopper is controlled to drop the first amount of the edge material to the first production line. The edge material transmitted to the two-stage crusher through the first production line is crushed into the first target particle size by the two-stage crusher to obtain the target particle size powder, so as to perform cold spray repair on the defective structural parts in the current production cycle.

[0021] According to the technical solution provided by the present invention, the method further includes calculating the first edge material amount; comprising the following steps:

[0022] Retrieving the yield rate of the structural parts, where the yield rate is the ratio of the good structural parts to all the structural parts in the current production cycle;

[0023] The first edge material amount is obtained according to the yield rate; wherein, the lower the yield rate is, the larger the first edge material amount is.

[0024] According to the technical solution provided by the present invention, after obtaining the powder with the target particle size, the following steps are further included:

[0025] Controlling the repair nozzle to use the target particle size powder to perform cold spray repair on each defective structural part corresponding to the repair category, and after all the defective structural parts are repaired, determining whether there is residual target particle size powder on the repair table;

[0026] If there is residual powder of the target particle size, controlling the recovery unit to recover the residual powder of the target particle size;

[0027] After all the defective structural parts are classified into several repair categories, the following steps are also included:

[0028] Determine whether the first particle size corresponding to the repair category is smaller than the first target particle size;

[0029] If yes, marking the first particle size smaller than the target particle size as a second target particle size;

[0030] The recovery unit is controlled to send the recovered residual target particle size powder to the pulverization unit again, so as to pulverize the target particle size to the second target particle size.

[0031] Compared with the prior art, the beneficial effect of the present invention is that the crushing unit of the present invention utilizes the trimmings produced during the die-casting process, and crushes part of the trimmings in the hopper through a two-stage crusher. The crushing process will produce target particle size powder corresponding to the defect according to the defect information obtained by the defect judgment unit, thereby realizing internal powder preparation and no longer relying on external purchases. At the same time, the defect position, type, size and other information of the defective structural parts are accurately obtained through the defect judgment unit, and then the crushing unit is controlled based on this information to prepare the target particle size powder that is precisely matched to the defect. This method ensures that the powder used for repair can better match the defective structural parts, improve the repair effect, and ensure the consistency of the quality of the repaired parts with the original structural parts as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of the cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles provided by the present invention;

[0033] Figure 2 A flow chart of the steps of the cold spray repair method for large aluminum-magnesium alloy complex structural parts for automobiles provided by the present invention.

[0034] The text annotations in the figure represent:

[0035] 1. Die casting unit; 2. Trimming machine; 3. Good product storage area; 4. Finished product conveyor belt; 5. Repair table; 6. Recovery unit; 7. Repair unit; 8. Screening component; 9. Crushing unit; 10. Furnace; 11. Hopper; 12. Grabbing robot arm; 13. Structural parts; 14. Good product structural parts; 15. Defective structural parts; 16. Edge materials. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] Example 1

[0039] As mentioned in the background technology, in view of the problems in the prior art, the present invention proposes a cold spray repair device for large-scale aluminum-magnesium alloy complex structural parts for automobiles, which is arranged on one side of a die-casting unit 1 for die-casting large-scale aluminum-magnesium alloy complex structural parts for automobiles; please refer to Figure 1 As shown, including:

[0040] A trimming unit, the trimming unit comprising a trimming machine 2 for trimming a structural member 13, and a hopper 11 for accommodating trimming material 16 formed after trimming, wherein the structural member 13 comprises a good structural member 14 and a defective structural member 15;

[0041] Specifically, the trimming unit is adjacent to the die casting unit 1, and the trimming machine 2 receives the structural member 13 just out of the die casting unit 1, and quickly performs the trimming operation, and the trimmed edge material 16 falls directly into the hopper 11. The hopper 11 is designed to have a certain capacity and sealing performance to prevent the edge material 16 from being scattered and damp.

[0042] A defect determination unit, the defect determination unit includes an image acquisition component, the image acquisition component is used to acquire an image of the structure 13 after trimming, and transmit it to a control center, the control center is used to determine whether the structure 13 is a defective structure 15 according to the image of the structure 13, and if so, obtain defect information of the defective structure 15, the defect information at least includes defect location, defect type and defect size; the control center is also used to obtain target particle size information according to the defect information of multiple defective structures 15, the target particle size information includes at least one target particle size;

[0043] Furthermore, it also includes a finished product conveyor belt 4 and a grabbing robot arm 12 arranged on one side of the finished product conveyor belt 4, the finished product conveyor belt 4 is used to convey the structural member 13 after trimming by the trimming unit, and the grabbing robot arm 12 is provided with the image acquisition component.

[0044] Specifically, the defect determination unit is located after the trimming unit, and the finished product conveyor belt 4 conveys the trimmed structural member 13 to the bottom of the image acquisition component. The image acquisition component can be composed of multiple high-definition industrial cameras, and the grabbing robot arm 12 flips the structural member 13 so that it can shoot the structural member 13 from different angles to ensure that the image information of the structural member 13 is fully obtained. These cameras transmit the collected images to the control center in real time, and the control center determines whether the structural member 13 is a defective structural member 15 through a pre-trained image recognition algorithm, and analyzes and obtains the defect information.

[0045] A pulverizing unit 9, wherein the pulverizing unit 9 comprises a two-stage pulverizer, and part of the side material 16 in the hopper 11 can be fed into the two-stage pulverizer through the first production line, and the two-stage pulverizer is used to pulverize the side material 16 delivered from the first production line according to the target particle size information to obtain a target particle size powder corresponding to the target particle size information;

[0046] Specifically, the first production line can be transported by pipeline or conveyor belt. The two-stage crusher includes primary crushing and secondary crushing. The primary crushing uses mechanical blades to preliminarily crush the edge material 16 of the structural part 13 to control its particle size range between 50-100 microns; the secondary crushing uses an air flow crusher to further crush the particles after primary crushing into ultra-fine powders of 1-50 microns to ensure that the powder particle size meets the requirements of the cold spraying process. The air flow crusher combines the synergistic effect of high-pressure gas (pressure range 0.5-1.0 MPa) and blades to make the powder particle size distribution more uniform, which can improve the deposition efficiency and coating density during the spraying process.

[0047] Specifically, the crushing unit 9 can adjust the crushing parameters according to different defect information to ensure that the edge material 16 is crushed into a target particle size powder corresponding to the defect information. For example, for smaller defects, finer powder is required, and the two-stage crusher can improve the crushing strength and accuracy; for larger defects, the powder particle size can be appropriately increased to improve the repair efficiency.

[0048] Furthermore, the device also includes a cooling unit arranged at the rear end of the powder unit. In order to prevent the powder from being oxidized due to the increase in temperature during the pulverization process, the cooling unit uses an inert gas cooling channel (preferably nitrogen) to quickly cool the powder. The nitrogen flow rate range is 2-5 L / min, which can effectively keep the temperature of the powder below 100°C, prevent the occurrence of oxidation, ensure the chemical stability of the powder and the surface activity of the particles, and improve the bonding effect during cold spraying. The cooling unit can adjust the nitrogen flow rate in real time through a temperature monitoring device to ensure cooling efficiency while saving resources.

[0049] The repair unit 7 includes a repair table 5 and a repair nozzle connected to the two-stage crusher, wherein the repair table 5 is used to support the defective structural part 15, and the repair nozzle is used to perform cold spray repair on the defective structural part 15 using the target particle size powder.

[0050] Furthermore, the repair nozzle is a Laval nozzle structure, and the repair unit 7 also includes a powder acceleration component connected to the Laval nozzle structure, and the powder acceleration component is used to accelerate the target particle size powder to a target injection speed. After reaching the target injection speed, the target particle size powder is ejected from the Laval nozzle structure.

[0051] Specifically, the powder acceleration component uses high-pressure airflow to accelerate the powder for a second time, so that its spraying speed reaches 200-800 m / s. The Laval nozzle structure realizes effective acceleration and focusing of the airflow through variable diameter design, ensures that the sprayed powder has sufficient kinetic energy and speed, and enhances the deposition effect of the powder on the surface of the substrate, thereby forming a high-density, high-adhesion coating. The air pressure and spraying speed of the Laval nozzle structure are adjustable, and can be flexibly controlled according to different repair needs, adapting to the repair requirements of different degrees of damage, and can be adjusted according to the surface of castings of different shapes and sizes. The spraying angle ranges from 15° to 75°. This flexibility enables the equipment to effectively respond to the repair needs of complex shapes, such as curved surfaces, grooves and other difficult-to-repair areas. The angle adjustment device of the nozzle accurately adjusts the spraying direction through an automatic control system to ensure uniform deposition of the coating, further improving the coating quality.

[0052] Furthermore, a screening component 8 is provided between the powder acceleration component and the two-stage pulverizer, and the screening component 8 is used to screen the initial powder obtained by the two-stage pulverizer to obtain the powder with the target particle size.

[0053] Specifically, the screening component 8 is composed of a vibrating screen and an airflow stirring device. When the powder passes through the vibrating screen, the coarse particles will be automatically separated to ensure that the powder particle size entering the acceleration component is uniform (controlled within the range of 1-50 microns). The airflow stirring device evenly distributes the screened powder through airflow disturbance, avoids the occurrence of powder agglomeration or adhesion, ensures the consistency and uniformity of the coating thickness, and thus improves the repair effect.

[0054] In a preferred embodiment, it further includes a furnace 10 connected to the die-casting unit 1 , and another portion of the edge material 16 in the hopper 11 can be sent to the furnace 10 for melting through a second production line, and the obtained molten liquid is sent back to the die-casting unit 1 .

[0055] Specifically, a furnace 10 is arranged near the die casting unit 1, and the furnace 10 is connected to the hopper 11 of the trimming unit through a second production line. The second production line can adopt a conveyor belt or a pipeline transportation system. When the edge material 16 in the hopper 11 accumulates to a certain extent, the control system starts the second production line according to a preset rule (how much proportion of the edge material 16 is used for crushing to form powder, and how much proportion of the edge material 16 is melted for die casting), and transports a part of the edge material 16 to the furnace 10.

[0056] Specifically, the furnace 10 heats and melts the edge material 16 to convert it into a molten liquid. The temperature, heating time and other parameters of the furnace 10 need to be precisely controlled according to the characteristics of the aluminum-magnesium alloy to ensure that the edge material 16 can be completely melted and there will be no quality problems caused by overheating. The molten liquid is sent back to the die-casting unit 1 through a specific conveying pipe or device and reused as a die-casting raw material. During the conveying process, a filtering device or the like can be set to remove possible impurities to ensure the quality of the die-casting.

[0057] In a preferred embodiment, the finished product conveyor belt 4 has a good product storage area 3 on the side away from the grabbing robot arm 12, and the grabbing robot arm 12 grabs the determined good structural parts 14 to the good product storage area 3, and grabs the determined defective structural parts 15 to the repair table 5.

[0058] Specifically, the grabbing robot arm 12 grabs the structural component 13 determined to be a good structural component 14 and places it in the good product storage area 3 according to the judgment result of the control center. The action of the grabbing robot arm 12 should be accurate and fast to ensure that no damage is caused to the good structural component 14. When the good structural components 14 in the good product storage area 3 accumulate to a certain number, the good structural components 14 can be transferred to the warehouse or the next process for further processing through other conveying equipment.

[0059] In a preferred embodiment, it further comprises a recovery unit 6, wherein the recovery unit 6 is used to recover the powder of the target particle size remaining on the repairing table 5 after the repairing is completed on the repairing table 5.

[0060] Specifically, the recovery unit 6 recovers the undeposited powder during the repair process through a negative pressure device to avoid material waste. When necessary, the recovered powder is sent back to the crushing unit 9 through a pipeline for secondary processing or reuse. This design reduces material loss during the cold spraying process, significantly reduces production costs, meets environmental protection requirements, and improves the economy and sustainability of the equipment.

[0061] Example 2

[0062] Based on Example 1, this example proposes a cold spray repair method for large aluminum-magnesium alloy complex structural parts for automobiles, which is implemented based on the cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles as described above. Please refer to Figure 2 As shown, the following steps are included:

[0063] S1. Obtain the defect information of each defective structural part 15 formed by die casting in the current production cycle, and obtain the first particle size of the powder required for cold spray repair of each defective structural part 15 according to the defect information;

[0064] Exemplarily, the structural parts A1, A2, A3, ... An produced in the current production cycle are judged in sequence, and the structural parts A2, A6, A8, A12, A15, A17, A20 ... are determined to be defective structural parts 15, and the other structural parts 13 except the defective structural parts 15 are marked as good structural parts 14, and are placed in the good area by the grabbing robot 12. Then, the control center obtains that the first particle size of the powder required for the cold spray repair of the structural part A2 is r1, the first particle size of the powder required for the cold spray repair of the structural part A6 is r2, the first particle size of the powder required for the cold spray repair of the structural part A8 is r1, the first particle size of the powder required for the cold spray repair of the structural part A12 is r3, the first particle size of the powder required for the cold spray repair of the structural part A15 is r3, the first particle size of the powder required for the cold spray repair of the structural part A17 is r1, and the first particle size of the powder required for the cold spray repair of the structural part A20 is r1.

[0065] S2, dividing all the defective structural parts 15 into several repair categories, and the first particle sizes of the defective structural parts 15 in the same repair category are the same;

[0066] Exemplarily, structural parts A2, A8, A17, and A20 are classified into the same repair category, and the first particle size corresponding to the repair category is r1; structural part A6 is classified into another repair category, and the first particle size corresponding to the repair category is r2; structural parts A12 and A15 are classified into another repair category, and the first particle size corresponding to the repair category is r3.

[0067] S3, taking the first particle size corresponding to the repair category with the largest number of defective structural parts 15 among all the repair categories as the first target particle size;

[0068] For example, if the number of defective structural parts 15 in the repair category with the first particle size r1 is the largest, r1 is used as the first target particle size, indicating that the number of defective structural parts 15 obtained by die casting in this production cycle is the largest, and they can be repaired first, so the target particle size powder of the first target particle size required for their repair can be crushed by the crushing unit 9. If the number of defective structural parts 15 in a certain repair category is large, it means that the demand for this particle size is large, and determining it as the first target particle size can improve the utilization rate of the powder and the repair efficiency.

[0069] S4, controlling the hopper 11 to drop the first amount of the edge material 16 to the first production line, and the edge material 16 transmitted to the two-stage crusher through the first production line is crushed into the first target particle size by the two-stage crusher to obtain the target particle size powder, so as to perform cold spray repair on the defective structural part 15 in the current production cycle.

[0070] Specifically, there may be many defective structural parts 15 with the same defect information in the same production cycle. At this time, the cut edge material 16 is crushed into powder and then repaired by itself, which can be fully adapted to ensure the repair effect.

[0071] In a preferred embodiment, the method further comprises calculating the first edge material amount; comprising the following steps:

[0072] Retrieve the yield rate of the structural component 13, where the yield rate is the ratio of the good structural component 14 to all the structural components 13 in the current production cycle;

[0073] For example, if 100 structural parts 13 are produced in the current production cycle, and there are 20 defective structural parts 15 among them, then the yield rate is 80%.

[0074] The first edge material amount is obtained according to the yield rate; wherein, the lower the yield rate is, the larger the first edge material amount is.

[0075] Furthermore, the scraps 16 other than the first scrap amount are transferred to the furnace 10 through the second production line. Then the scraps 16 contained in the hopper 11 can have two simultaneous recovery routes, which can be used as raw materials for the crushing unit 9 to produce powder required for repairing defects, and can also be used as raw materials for continuing die casting to improve die casting efficiency.

[0076] Specifically, according to the retrieved yield rate, the control center uses a preset algorithm to calculate the first edge material amount. Among them, the lower the yield rate, the larger the first edge material amount. This is because a low yield rate means that the number of defective structural parts 15 is large, and more edge materials 16 are needed to prepare repair powder. For example, if the yield rate is 60%, it is calculated according to the algorithm that more edge materials 16 need to be put down to the first production line to ensure the amount of powder required to repair the defects; if the yield rate is 90%, the first edge material amount can be appropriately reduced, and a larger proportion of edge materials 16 can be sent to the furnace 10 to replenish the die-casting raw material liquid of the die-casting unit 1.

[0077] Optionally, the preset algorithm can be a regression algorithm based on historical data. If there is a large amount of historical production data, a relationship model F=aP+b (where F is the first edge material amount and P is the yield) between the yield rate and the first edge material amount can be established through data regression analysis. Exemplarily, a linear regression model is used to obtain the values ​​of coefficients a and b by fitting the historical data. Assuming that a=-100 and b=100 are obtained through data fitting, when P=75%, F is 25. This algorithm based on historical data can better reflect the laws in actual production, but it requires sufficient data support and accurate model fitting.

[0078] In a preferred embodiment, after obtaining the powder with the target particle size, the method further comprises the following steps:

[0079] Control the repair nozzle to use the target particle size powder to perform cold spray repair on each defective structural part 15 corresponding to the repair category, and after all the defective structural parts 15 are repaired, determine whether there is residual target particle size powder on the repair table 5;

[0080] Specifically, the repair station 5 is provided with a sensor for detecting whether there is residual powder of target particle size.

[0081] If there is residual target particle size powder, the recovery unit 6 is controlled to recover the residual target particle size powder;

[0082] After all the defective structural parts 15 are classified into several repair categories, the following steps are also included:

[0083] Determine whether the first particle size corresponding to the repair category is smaller than the first target particle size;

[0084] If yes, marking the first particle size smaller than the target particle size as a second target particle size;

[0085] For example, as can be seen from the above, r1 is the target particle size. If r1 is 50 microns, after all defective structural parts 15 in the repair category corresponding to r1 are repaired, if a large amount of target particle size powder of the target particle size of r1 remains on the repair table 5, the remaining target particle size powder will be recovered in time. If there is a first particle size smaller than 50 microns in the repair category, for example, if only r2 is 20 microns, then r2 is used as the second target particle size.

[0086] Furthermore, if there are at least two of the repair categories whose corresponding first particle sizes are smaller than the first target particle size, the first particle size with a larger number of defective structural parts 15 in the repair category is marked as the second target particle size. For example, if r2 is 20 microns, there are 4 defective structural parts 15 in the corresponding repair category, and r3 is 40 microns, there are 10 defective structural parts 15 in the corresponding repair category, then r3 is used as the second target particle size.

[0087] The recovery unit 6 is controlled to send the recovered residual target particle size powder to the pulverization unit 9 again, so as to pulverize the target particle size to the second target particle size.

[0088] In this embodiment, the target particle size powder remaining on the repair table 5 can be recovered by the recovery unit 6 and fully utilized in the next repair process.

[0089] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles, characterized by: The device is arranged on one side of a die-casting unit (1) for die-casting a large aluminum-magnesium alloy complex structural part for an automobile; and comprises: A trimming unit, the trimming unit comprising a trimming machine (2) for trimming a structural component (13), and a hopper (11) for accommodating trimming material (16) formed after trimming, the structural component (13) comprising a good structural component (14) and a defective structural component (15); A defect determination unit, the defect determination unit comprising an image acquisition component, the image acquisition component being used to acquire an image of the structural member (13) after trimming, and transmit the image to a control center, the control center being used to determine whether the structural member (13) is a defective structural member (15) based on the image of the structural member (13), and if so, to obtain defect information of the defective structural member (15), the defect information at least comprising a defect position, a defect type and a defect size; the control center being used to obtain target particle size information based on the defect information of the plurality of defective structural members (15), the target particle size information comprising at least one target particle size; A pulverizing unit (9), the pulverizing unit (9) comprising a two-stage pulverizer, part of the side material (16) in the hopper (11) can be fed into the two-stage pulverizer via the first production line, the two-stage pulverizer being used to pulverize the side material (16) delivered from the first production line according to the target particle size information, so as to obtain a target particle size powder corresponding to the target particle size information; A repair unit (7), the repair unit (7) comprising a repair table (5) and a repair nozzle connected to the two-stage pulverizer, the repair table (5) being used to carry the defective structural component (15), and the repair nozzle being used to perform cold spray repair on the defective structural component (15) using the target particle size powder.

2. The cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 1 is characterized in that: It also includes a melting furnace (10) connected to the die-casting unit (1), and another part of the edge material (16) in the hopper (11) can be sent to the melting furnace (10) through a second production line for melting, and the obtained molten liquid is sent back to the die-casting unit (1).

3. The cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 2 is characterized in that: It also comprises a finished product conveyor belt (4) and a grabbing mechanical arm (12) arranged on one side of the finished product conveyor belt (4), the finished product conveyor belt (4) being used to convey the structural member (13) after trimming by the trimming unit, and the grabbing mechanical arm (12) being provided with the image acquisition component.

4. The cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 3 is characterized in that: The finished product conveyor belt (4) has a good product storage area (3) on a side away from the grabbing robot arm (12); the grabbing robot arm (12) grabs the determined good product structural component (14) to the good product storage area (3), and grabs the determined defective structural component (15) to the repair platform (5).

5. The cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 4 is characterized in that: The repair nozzle is a Laval nozzle structure, and the repair unit (7) also includes a powder acceleration component connected to the Laval nozzle structure, the powder acceleration component is used to accelerate the target particle size powder to a target injection speed, and the target particle size powder is ejected from the Laval nozzle structure after reaching the target injection speed.

6. The cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 5 is characterized in that: A screening component (8) is also provided between the powder acceleration component and the two-stage pulverizer, and the screening component (8) is used to screen the initial powder obtained by pulverizing the two-stage pulverizer to obtain the powder with the target particle size.

7. The cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 6 is characterized in that: It also comprises a recovery unit (6), wherein the recovery unit (6) is used to recover the target particle size powder remaining on the repair table (5) after the repair is completed on the repair table (5).

8. A cold spray repair method for large aluminum-magnesium alloy complex structural parts for automobiles, which is implemented based on the cold spray repair equipment for large aluminum-magnesium alloy complex structural parts for automobiles according to any one of claims 1 to 7, characterized in that: The following steps are involved: Acquiring the defect information of each defective structural part (15) formed by die casting in the current production cycle, and obtaining, based on the defect information, a first particle size of powder required for cold spray repair of each defective structural part (15); dividing all the defective structural parts (15) into a plurality of repair categories, wherein the first particle sizes of the defective structural parts (15) in the same repair category are the same; taking the first particle size corresponding to the repair category having the largest number of defective structural parts (15) among all the repair categories as the first target particle size; The hopper (11) is controlled to place the first amount of the edge material (16) down to the first production line, and the edge material (16) is conveyed to the two-stage crusher through the first production line and crushed into the first target particle size by the two-stage crusher to obtain the target particle size powder, so as to perform cold spray repair on the defective structural part (15) in the current production cycle.

9. The cold spray repair method for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 8, characterized in that: The method also includes calculating the first edge material amount; comprising the following steps: Retrieving the yield rate of the structural parts (13), wherein the yield rate is the ratio of the good structural parts (14) to all the structural parts (13) in the current production cycle; The first edge material amount is obtained according to the yield rate.

10. The cold spray repair method for large aluminum-magnesium alloy complex structural parts for automobiles according to claim 8, characterized in that: After obtaining the target particle size powder, The following steps are involved: Controlling the repair nozzle to use the target particle size powder to cold spray repair each defective structural part (15) corresponding to the repair category, and after all the defective structural parts (15) have been repaired, determining whether there is any residual target particle size powder on the repair table (5); If the target particle size powder remains, controlling the recovery unit (6) to recover the target particle size powder; After classifying all the defective structural parts (15) into a number of repair categories, the following steps are also included: Determine whether the first particle size corresponding to the repair category is smaller than the first target particle size; If yes, marking the first particle size smaller than the target particle size as a second target particle size; The recovery unit (6) is controlled to send the recovered residual target particle size powder to the pulverization unit (9) again, so as to pulverize the target particle size to the second target particle size.

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