Multi-vehicle-type mixed-line production system and method for automobile parts

Abstract

The invention provides a multi-vehicle-type mixed-line production system and method for automobile parts, and belongs to the technical field of automobile manufacturing, and the system comprises a programmable processing unit which is used for processing materials according to a production formula so as to form parts corresponding to different vehicle types; the material caching and sorting device comprises an assembling caching station, a discharging station and a sampling inspection station. The assembling and buffering station is used for buffering machined parts, the discharging station is used for discharging qualified parts, and the sampling inspection station is used for part offline inspection and line returning; the material carrying device is used for carrying materials among the stations; the central control unit is connected with the material caching and sorting device, the material carrying device and each programmable processing unit; the central control unit creates a production data record for each material individual and updates the production data record in real time along with circulation of the material individual, the carrying device and the processing unit are driven, and multi-vehicle-type mixed line production, dynamic scheduling and spot check line returning are achieved. Multi-vehicle-type mixed-line production is achieved, the production flexibility and efficiency are improved, and the production cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of automotive manufacturing technology, specifically relating to a multi-model mixed-line production system and method for automotive parts. Background Technology

[0002] In automobile manufacturing, as market demand shifts towards multi-variety, small-batch production, achieving flexible and intelligent mixed-line production of parts for various car models on the same production line has become crucial for improving production efficiency and reducing manufacturing costs. Traditional automotive component machining and assembly lines are typically designed for a single car model, with fixed configurations for line equipment (such as CNC machining centers and assembly stations), tooling fixtures, and production cycles. When switching to produce parts for different car models, cumbersome downtime for mold changes, program resetting, and manual scheduling are often required, resulting in low production line utilization, high changeover costs, and poor production flexibility.

[0003] While existing technologies have achieved a certain degree of automation in production lines using programmable logic controllers (PLCs), the following problems remain when facing complex scenarios involving the mixed production of multiple vehicle models: First, there is a lack of unified dynamic scheduling capabilities for the entire production line, making it difficult to allocate and coordinate tasks for multiple CNC machines processing parts from different vehicle models simultaneously. Second, the identification information of parts on the production line (such as vehicle model and process status) cannot be tracked and integrated in real time throughout the entire process, leading to chaotic work-in-process management and difficulties in quality traceability. Finally, there is a lack of intelligent response mechanisms for random events during the production process (such as parts sampling, handling of non-conforming products, and return of conforming products to the line), still requiring significant manual intervention and affecting the continuity and automation level of production.

[0004] Therefore, there is an urgent need for an integrated control system and production method that can automatically identify, process on demand, track status, transfer in a mixed manner, and intelligently handle parts of various car models through software configuration and scheduling on a single hardware production line without frequent tooling changes, thereby improving the flexibility and overall efficiency of automotive component machining and assembly lines. Summary of the Invention

[0005] In a first aspect, embodiments of this application provide a multi-model mixed-line production system for automotive components, including: At least two programmable processing units are used to process materials according to different production formulas to form parts corresponding to different car models; The material buffering and sorting device includes at least one assembly buffer station, at least one unloading station, and a sampling inspection station; the assembly buffer station is used to buffer processed parts from the programmable processing unit, the unloading station is used for qualified parts to be unloaded, and the sampling inspection station is used for offline inspection and return of parts. Material handling equipment is used to move materials between programmable processing units and various workstations; The central control unit communicates with the material buffer and sorting device, the material handling device, and each programmable processing unit. The central control unit is configured to execute the following logic: Each material is assigned a unique identifier, and a corresponding production data record is created. Based on the predefined formulas for each vehicle model, a target vehicle model processing program is assigned to each individual material, and the material handling device is scheduled to transport the individual material to a selected programmable processing unit. In response to every change in the physical location of an individual material, the corresponding production data record is dynamically updated to reflect the current process status, location information, and vehicle model information in real time. Based on real-time production data records of individual materials, the material handling device is scheduled to move individual materials from the programmable processing unit to the material buffer and sorting device. Based on preset rules or external instructions and the final production data records of individual materials, the system controls the material buffer and sorting device to classify and transport qualified parts to the corresponding unloading station, or to transfer designated parts to the sampling inspection station. It can also re-integrate qualified parts into the production process and guide them to the corresponding unloading station.

[0006] Furthermore, the programmable machining unit adopts a CNC machining center; The material handling device includes a loading robot and an unloading robot; The system also includes a loading station located at the beginning of the production line; The loading station, CNC machining center, and material flow direction along the production line are set up in sequence, while the sampling inspection station and unloading station are set downstream of the assembly buffer station. The loading and handling robot is located downstream of the loading station and is used to pick up the blanks from the loading station and transport them to any CNC machining center. The material handling robot is located downstream of the CNC machining center and is used to remove the machined parts from the CNC center and transport them to the assembly buffer station. The sampling inspection station and at least one unloading station are located at the end of the production line.

[0007] Furthermore, it also includes a human-machine interface that communicates with the central control unit; The end effector of the material handling robot is equipped with a fixed barcode scanner, which is used to read the unique part code set on the blank as a unique identification information. The central control unit is connected to the fixed barcode scanner and executes the following scanning logic: If the barcode scan is successful and the part code verification passes, the grabbing action will be executed and a production data record will be created. If scanning fails, an alarm is triggered and manual entry of the part code is allowed through the human-machine interface. After the manual entry is completed, a production data record is created based on the manually entered part code. The human-machine interface is also used to provide interactive functions such as vehicle formula management, production control, real-time monitoring of parts status, and sampling inspection and return management.

[0008] Secondly, embodiments of this application also provide a method for multi-model mixed-line production of automotive components in the system described in the first aspect, comprising the following steps: S1. Set a vehicle formula containing processing parameters for at least two vehicle models through the central control unit; S2. Bind a unique identifier to each material entering the production line and create a corresponding production data record in the central control unit; S3. The central control unit assigns target programmable processing units and vehicle processing programs to individual materials based on the vehicle model formula and the status of each programmable processing unit, and controls the material handling device to perform loading processing. S4. After the individual material is processed, the central control unit, based on the production data records and the availability status of the downstream workstations in the material buffer and sorting device, schedules the material handling device to transfer the individual material to the next target workstation and updates the production data records simultaneously. S5. For parts arriving at the buffer area, the central control unit controls the sorting device to classify and transport the parts to the corresponding unloading station based on the vehicle model information in the production data record, or to transfer the parts to the sampling inspection station according to the sampling inspection instruction. S6. For parts that pass inspection at the sampling station, the central control unit retrieves complete production data records based on the unique identification information and controls the handling device to reconnect the parts to the production line, and then classifies and transfers them to the corresponding unloading station according to the vehicle model information.

[0009] Furthermore, the specific steps of step S1 are as follows: S11. Through the human-machine interface, set the planned vehicle models and planned output for at least two programmable processing units and unloading stations on the production line; S12. Issue production setting check commands through the human-machine interface to check the planned vehicle models and planned output: Determine whether the vehicle model set by the same programmable processing unit or unloading station is one of the vehicle model formulas supported by the system, and determine whether there is any logical conflict. If both conditions are met, proceed to step S13; If either condition is not met, an alarm will be generated on the human-computer interaction interface, the setting will be prevented from taking effect, and the process will end. S13. The central control unit activates the settings for the planned vehicle models and planned production volumes; S14. Determine the production mode based on the number of vehicle models that are in effect: If only one vehicle model is affected, then the single-model production mode will be entered. If more than one model is affected, the mixed-line production mode will be activated.

[0010] Furthermore, the specific steps in step S2 are as follows: S21. Control the loading and handling robot to move to the gripping position, and start the fixed barcode scanner on the end effector of the loading and handling robot to read the part code of the blank; S22. The central control unit determines whether the part code has been successfully read and verified: If so, the part code is used as the unique identifier to create an initial production data record and store it in the first data area, and then the fetching is performed; If not, an audible and visual alarm will be triggered and a prompt will be displayed on the human-machine interface. The correct part code will be manually entered through the human-machine interface. Based on the manually entered part code, an initial production data record will be created and stored in the first data area.

[0011] Furthermore, in step S3, the central control unit assigns the target programmable processing unit and the vehicle processing program to each material based on the vehicle model formula and the status of each programmable processing unit, as follows: S31. The central control unit maintains a list containing the status of all programmable processing units in real time; the status of the programmable processing units includes idle, processing, and fault. S32. When there are individual materials to be processed, the central control unit queries the list and selects the first programmable processing unit that is in an idle state as the target processing unit; S33. Generate a transport instruction containing the target unit location information, and schedule the loading and transporting robot to transport the material individual with the unique identification information to the target processing unit.

[0012] Furthermore, the specific steps for synchronously updating production data records in step S4 are as follows: S41. When the equipment A corresponding to the previous physical position of a material on the production line is moved to the equipment B corresponding to the next target workstation, a data migration event is triggered; S42. The central control unit uses the unique identifier of each material as an index to search for the current production data record that is bound to the material and corresponds to device A in the pre-maintained centralized data storage area; S43. The central control unit copies or associates the current production data record to the data partition corresponding to device B in the centralized data storage area, and updates the status information to reflect that the material individual is located in device B. At the same time, it archives or marks the original production data record corresponding to device A as a historical record.

[0013] Furthermore, the specific steps of step S5 are as follows: S51. The central control unit determines whether parts located at the assembly buffer station need to be sampled for inspection; If so, proceed to step S52; If not, proceed to step S53; S52. The material handling robot of the scheduling material handling device moves the part to the sampling inspection station and transfers the corresponding production data record from the assembly buffer station data area to the sampling inspection station data area; S53. The central control unit executes the following classification logic: The vehicle model information in the production data record of the part is read, and the unloading robot of the material handling device is scheduled to classify and transfer the part to the corresponding unloading station according to the preset vehicle model-unloading station mapping relationship.

[0014] Furthermore, the specific steps of step S6 are as follows: S61. At the sampling inspection station, the operator uses a handheld barcode scanner to scan the qualified parts. The central control unit receives the part code obtained from the scan and generates a return line request. S62. The central control unit retrieves the entire historical processing data of the part from the quality traceability system database based on the part code, and verifies its validity; S63. After verification, the central control unit marks the status information of the part as qualified and writes it into the real-time data area corresponding to the sampling inspection station; S64. The material handling robot in the scheduling material handling device picks up the part from the sampling inspection station and records the corresponding production data into the data area corresponding to the material handling robot. S65. The central control unit analyzes the data in the data area of ​​the unloading and handling robot, and according to the vehicle model information, schedules the unloading and handling robot to classify and transfer the parts to the corresponding unloading station to complete the return line offline.

[0015] As can be seen from the above technical solutions, this application has the following advantages: The multi-model mixed-line production system and method for automotive parts provided in this application enables the mixed-line production of parts from multiple vehicle models on the same production line. This eliminates the need for frequent tooling changes, and the software configuration and scheduling can meet the production needs of various vehicle models, improving the flexibility of the production line. Multiple programmable processing units can simultaneously process parts from different vehicle models, reducing downtime caused by model switching and improving equipment utilization and overall production efficiency. By binding unique identification information to each material and creating production data records, real-time tracking and data integration of parts throughout the production line are achieved, facilitating production process monitoring and quality traceability, and improving the level of production intelligence. The setting of sampling inspection stations and the intelligent return processing of qualified sampled parts ensure the stability of product quality while reducing manual intervention and minimizing quality problems caused by human factors. It also reduces the costs of equipment modification and tooling replacement required for model switching, while improving production efficiency, thereby reducing the production cost per unit product. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the multi-model mixed-line production system for automotive parts according to the present invention.

[0018] Figure 2 This is a schematic flowchart of the multi-model mixed-line production method for automotive parts according to the present invention.

[0019] Figure 3 This is a schematic diagram of the barcode scanner's grabbing decision process in the material handling robot of this invention.

[0020] Figure 4 This is a schematic diagram of the interface for setting the planned vehicle models and planned production volume in this invention.

[0021] Figure 5 This is a schematic diagram illustrating the matching of part numbers and vehicle models in the product information of this invention.

[0022] Figure 6 This is a schematic diagram of the interface for performing part scanning interaction in this invention.

[0023] Figure 7 This is a schematic diagram of the interface for performing random inspection and return interaction in this invention. Detailed Implementation

[0024] The various embodiments of this disclosure will be described more fully in the following detailed description of a multi-model mixed-line production system for automotive components. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0025] This embodiment provides a multi-model mixed-line production system for automotive parts. Through a flexible production system, it enables mixed-line processing of multiple models, improves production efficiency, optimizes quality control, and reduces production costs.

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 The diagram shown is a schematic of a multi-model mixed-line production system for automotive parts in a specific embodiment. The system includes: At least two programmable processing units are used to process materials according to different production formulas to form parts corresponding to different car models; The material buffering and sorting device includes at least one assembly buffer station, at least one unloading station, and a sampling inspection station; the assembly buffer station is used to buffer processed parts from the programmable processing unit, the unloading station is used for qualified parts to be unloaded, and the sampling inspection station is used for offline inspection and return of parts. Material handling equipment is used to move materials between programmable processing units and various workstations; The central control unit communicates with the material buffer and sorting device, the material handling device, and each programmable processing unit. The central control unit is configured to execute the following logic: Each material is assigned a unique identifier, and a corresponding production data record is created. Based on the predefined formulas for each vehicle model, a target vehicle model processing program is assigned to each individual material, and the material handling device is scheduled to transport the individual material to a selected programmable processing unit. In response to every change in the physical location of an individual material, the corresponding production data record is dynamically updated to reflect the current process status, location information, and vehicle model information in real time. Based on real-time production data records of individual materials, the material handling device is scheduled to move individual materials from the programmable processing unit to the material buffer and sorting device. Based on preset rules or external instructions and the final production data records of individual materials, the material buffer and sorting device controls the qualified parts to be classified and transported to the corresponding unloading station, or the designated parts to be transferred to the sampling inspection station. It can also re-integrate the qualified parts into the production process and guide them to the corresponding unloading station. It should be noted that the programmable machining unit can process materials according to different production formulas to form parts corresponding to different car models, realizing the flexibility and automation of the processing process, and improving production efficiency and product quality. The material buffering and sorting device enables the orderly storage, classified transportation and quality control of parts, thereby improving production flexibility and quality stability. Material handling equipment enables automated material transfer, reduces manual handling workload, and improves production efficiency and the accuracy of material flow.

[0028] The central control unit can control the entire production process according to predefined logic, realizing intelligent scheduling and management of production, and improving the degree of automation and efficiency of production.

[0029] This embodiment enables mixed-line production of parts for multiple vehicle models on the same production line, improving production flexibility and efficiency, reducing equipment downtime, optimizing quality control, and lowering production costs.

[0030] Furthermore, as a refinement and extension of the specific implementation methods described above, and in order to fully illustrate the specific implementation process in this embodiment, as follows: Figure 1 As shown, another multi-model mixed-line production system for automotive parts is provided. Based on the engine block machining production line of an automotive parts manufacturing company, it realizes the mixed-line production of cylinder blocks for three models (model A, model B, and model C). The production line adopts a "I"-shaped layout, integrating four CNC machining centers (CNC1-CNC4) as programmable machining units, and configuring two seven-axis sliding rail handling robots (loading robot and unloading robot) as material handling devices. It is equipped with loading stations, assembly buffer stations, sampling inspection stations, and two unloading stations (first unloading station and second unloading station). The system includes: At least two programmable processing units are used to process materials according to different production formulas to form parts corresponding to different car models; The material buffering and sorting device includes at least one assembly buffer station, at least one unloading station, and a sampling inspection station; the assembly buffer station is used to buffer processed parts from the programmable processing unit, the unloading station is used for qualified parts to be unloaded, and the sampling inspection station is used for offline inspection and return of parts. Material handling equipment is used to move materials between programmable processing units and various workstations; The central control unit communicates with the material buffer and sorting device, the material handling device, and each programmable processing unit. The central control unit is configured to execute the following logic: Each material is assigned a unique identifier, and a corresponding production data record is created. Based on the predefined formulas for each vehicle model, a target vehicle model processing program is assigned to each individual material, and the material handling device is scheduled to transport the individual material to a selected programmable processing unit. In response to every change in the physical location of an individual material, the corresponding production data record is dynamically updated to reflect the current process status, location information, and vehicle model information in real time. Based on real-time production data records of individual materials, the material handling device is scheduled to move individual materials from the programmable processing unit to the material buffer and sorting device. Based on preset rules or external instructions and the final production data records of individual materials, the material buffer and sorting device controls the qualified parts to be classified and transported to the corresponding unloading station, or the designated parts to be transferred to the sampling inspection station. It can also re-integrate the qualified parts into the production process and guide them to the corresponding unloading station. The programmable machining unit adopts a CNC machining center; The material handling device includes a loading robot and an unloading robot; The system also includes a loading station located at the beginning of the production line; The loading station, CNC machining center, and material flow direction along the production line are set up in sequence, while the sampling inspection station and unloading station are set downstream of the assembly buffer station. The loading and handling robot is located downstream of the loading station and is used to pick up the blanks from the loading station and transport them to any CNC machining center. The material handling robot is located downstream of the CNC machining center and is used to remove the machined parts from the CNC center and transport them to the assembly buffer station. The sampling inspection station and at least one unloading station are located at the end of the production line. It also includes a human-machine interface that communicates with the central control unit; The end effector of the material handling robot is equipped with a fixed barcode scanner, which is used to read the unique part code set on the blank as a unique identification information. The central control unit is connected to the fixed barcode scanner and executes the following scanning logic: If the barcode scan is successful and the part code verification passes, the grabbing action will be executed and a production data record will be created. If scanning fails, an alarm is triggered and manual entry of the part code is allowed through the human-machine interface. After the manual entry is completed, a production data record is created based on the manually entered part code. The human-machine interface is also used to provide interactive functions such as vehicle formula management, production control, real-time monitoring of parts status, and sampling inspection and return management; For example, the system hardware includes: The programmable machining unit uses four five-axis bridge-type double gantry high-speed machining centers (CNC1-CNC4). Each machine supports the calling of machining programs for vehicle model A, vehicle model B, and vehicle model C. The machine establishes real-time communication with the central control unit through the Profinet communication protocol. It can receive vehicle model machining programs, machining parameters, and production task instructions issued by the central control unit, and provide feedback on the machine's operating status (idle, machining, fault) and machining progress information. Each CNC machining center is equipped with an independent tooling and fixture system, which is compatible with the positioning and machining of cylinder blocks of three vehicle models, and can realize continuous machining of different vehicle models without manual intervention.

[0031] Material handling equipment includes the following: The loading and handling robot is located downstream of the loading station and adopts a seven-axis sliding rail structure. The end effector is equipped with a fixed barcode scanner and supports data interaction with the central control unit via the Profinet communication protocol. Its core function is to pick up the blanks from the double material frames (1 backup configuration) of the loading station, read the unique part code of the blanks through the barcode scanner, and after verification by the central control unit, transport the blanks to any available CNC machining center. The material handling robot is located between the downstream area of ​​the CNC machining center and the end of the line. It is responsible for taking the machined cylinder block out of the CNC machining center and transferring it to the assembly buffer station. At the same time, it picks up parts from the assembly buffer station and transfers the parts to the corresponding unloading station or sampling station according to the instructions of the central control unit. It also supports picking up qualified return parts from the sampling station and transferring them to the corresponding unloading station in a classified manner, realizing the closed-loop flow of parts throughout the entire process. The material buffering and sorting device includes: The loading station is equipped with a dual-frame parallel structure and adopts a "1-for-1" feeding mode. Each frame can hold 50 blanks. The surface of the blank is printed with a unique QR code in the form of a part code, which includes the blank number, material information, and range of compatible vehicle models. The assembly cache station is equipped with two compatible cache platforms (first assembly cache station and second assembly cache station). Each platform can store 10 processed parts from different vehicle models at the same time. The station is equipped with position sensors to provide real-time feedback on the station occupancy status to the central control unit.

[0032] The sampling inspection station is located on the left side of the end of the production line. It is equipped with offline testing equipment, handheld barcode scanners, and audible and visual alarm devices. It supports the inspection of the dimensional accuracy and surface quality of parts. The part code can be read by the handheld barcode scanner to initiate a return-to-line request. The inspection data is uploaded to the quality traceability system database in real time.

[0033] The unloading station is equipped with two classified unloading platforms (first unloading station and second unloading station). The first unloading station is for qualified parts of model A and model B to be unloaded, and the second unloading station is for qualified parts of model C to be unloaded. Each station is equipped with a parts counting sensor and a finished product buffer rack, which can automatically count the output and feed it back to the central control unit. The central control unit uses a Siemens SIMATIC S7-1500 PLC as its control core and expands with ET 200SP distributed I / O modules to achieve centralized control and data acquisition of all equipment on the production line. The central control unit has a built-in centralized data storage area, including the first data area (material loading station data area), data partitions corresponding to each equipment (CNC1-CNC4 data areas, robot data areas, assembly buffer station data areas, etc.), sampling inspection station data area, and historical data archiving area. The QualityTrace_DB data block is used to uniformly manage the entire production process data of the parts. The control program contains multiple function blocks: ProductionData_Main_FC (FC70) serves as the main calling function block, responsible for calling the quality information tracking function block (QualityTrace_FC, FC71), the part information retrieval function block (PartCheck_FC, FC73), the production setting function block (Product_FC, FC74), etc.; HMI_Main_FC (FC90) serves as the main human-machine interaction control function block, calling the HMI interface function setting function block (HMI_Function_FC, FC94), the recipe management function block (PartRecipeCtrl_FC, FC192), etc., to achieve coordinated control of hardware and software; Human-computer interaction interface: The visual operation interface is developed based on WinCC Runtime Professional, including a vehicle model formula management interface, a production control interface, a real-time part status monitoring interface, a barcode scanning interface, and a sampling inspection and return-to-line interface. The interface supports touch operation and can display data such as the operating status of each device, the current vehicle model being processed, planned output / actual output, part code information, and process progress. It provides operation buttons such as production setting check, production setting activation, mixed-line production start / stop, and line clearing. It also supports functions such as manually entering part codes, setting sampling inspection rules, and processing return-to-line requests.

[0034] The system software functions are implemented as follows: Vehicle Formula Management: The central control unit has a built-in vehicle model formula database, storing information such as processing parameters (cutting speed, feed rate, machining depth, etc.), process flow, compatible CNC machining center range, and blanking station mapping relationship for vehicle models A, B, and C. Operators can set the planned processing models and planned output for each CNC machining center and blanking station through the human-machine interface. For example, CNC1 can be set to process vehicle model A (planned output 1000 pieces), CNC2 to process vehicle model B (planned output 800 pieces), CNC3 to process vehicle model A (planned output 500 pieces), and CNC4 to process vehicle model C (planned output 600 pieces). The first blanking station corresponds to vehicle models A and B, and the second blanking station corresponds to vehicle model C. After the settings are completed, the operator issues a "Production Settings Check" command. The central control unit automatically verifies whether the vehicle models set in the same CNC machining center or blanking station are among the vehicle model formulas supported by the system, and whether there are any logical conflicts (e.g., the blanking station does not simultaneously map opposing vehicle models). If the verification passes, the "Production Settings Take Effect" button can be clicked to make the settings effective. If the verification fails, the human-machine interface will display an alarm message (e.g., "CNC1 sets vehicle model D to an unsupported formula") and prevent the settings from taking effect. After taking effect, the central control unit automatically determines the production mode based on the number of effective vehicle models: if only one vehicle model is effective, it enters the single-vehicle production mode; if two or more vehicle models are effective, it automatically starts the mixed-line production mode. Unique Part Identifier and Data Recording: In the production data record created by the central control unit for each part, the part code is linked to and updated in real time with the vehicle model information; the product information monitoring view provided by the human-machine interface is as follows: Figure 5 As shown, the system can dynamically display the part code of the part in the current process and its corresponding vehicle model status. The specific process is as follows: QR code binding process: After receiving the loading instruction, the loading and handling robot moves to the part grabbing position and starts the fixed barcode scanner on the end effector to read the part code of the blank part; after receiving the barcode data, the central control unit first verifies the validity of the part code (whether it is the encoding format registered in the system and whether it is compatible with the currently set vehicle model): If the scan is successful and the part code verification passes, the central control unit uses the part code as the unique identifier to create an initial production data record in the first data area, which includes data such as part code, vehicle model information, online time, and target processing unit (to be assigned). Then, it controls the robot to perform the grasping action. If scanning fails (e.g., the part code is blurry, missing, or the scanner is faulty), the system will trigger an audible and visual alarm, and the human-machine interface will display the message "Scanning failed, please handle manually". After the operator confirms that the blank is qualified, the operator can manually enter the part code through the interface. The central control unit will create an initial production data record based on the manually entered part code and store it in the first data area. Then the robot will perform the grasping action. When automatic scanning fails, the operator can manually enter the correct part code through the human-machine interface. The part scanning interface is shown below. Figure 6 As shown, this ensures that the production process can continue even in abnormal situations; Dynamic data recording and updating: The central control unit maintains the production data records of parts in real time. When the physical location of a part changes (such as moving it from the loading station to the CNC machining center, or from the CNC machining center to the assembly buffer station), a data migration event is automatically triggered. Taking the movement of a part from CNC1 (equipment A) to the first assembly buffer station (equipment B) as an example: The central control unit uses the unique identification information of the part as an index to search for the current production data record in the data partition of the corresponding CNC1 in the centralized data storage area; Copy the production data record to the data partition corresponding to the first assembly buffer station, and update the status information (such as updating the process status from "CNC machining completed" to "assembly buffer") and the location information (from "CNC1" to "first assembly buffer station"). Mark the original production data records in the data partition corresponding to CNC1 as historical records and archive them to the historical data area; The production data record includes part codes, vehicle model information, start / end times of each process, processing equipment numbers, processing parameters, quality inspection data, current location, status information, etc., enabling full traceability of parts throughout the entire process; Production scheduling and control: Machining Unit Allocation: The central control unit maintains a real-time status list of all CNC machining centers (idle, processing, faulty). When there is a material to be processed, the central control unit queries the list and selects the first CNC machining center with an "idle" status as the target machining unit. For example, if the target vehicle model of the part to be processed is vehicle model A, and CNC1 is currently idle, then CNC1 is allocated as the target machining unit, and the machining program corresponding to vehicle model A is called to CNC1. Material handling scheduling: The central control unit generates a handling instruction containing the location information of the target unit, and schedules the loading and handling robot to transport the blank part with the unique identification information to the target processing unit; after processing is completed, the CNC machining center sends a "processing completed" signal to the central control unit. The central control unit queries the availability status of the assembly buffer station, schedules the unloading and handling robot to move the part from the CNC machining center to the idle assembly buffer station, and updates the production data record simultaneously. Sorting and Scheduling: After the unloading and handling robot picks up parts from the assembly buffer station, the central control unit schedules the unloading and handling robot for classified transportation based on the vehicle model information in the part's production data record and the preset vehicle model-unloading station mapping relationship. If the part is for vehicle model A or B, it is transferred to the first unloading station; if it is for vehicle model C, it is transferred to the second unloading station. At the same time, the central control unit determines whether sampling inspection is required based on preset sampling inspection rules (such as sampling inspection of 1 part for every 50 parts produced) or external sampling inspection instructions: if sampling inspection is required, the unloading and handling robot is scheduled to transfer the part to the sampling inspection station and transfer the corresponding production data record from the assembly buffer station data area to the sampling inspection station data area; if sampling inspection is not required, it is directly transferred to the corresponding unloading station.

[0035] Sampling inspection and return handling: Sampling Inspection Process: After the parts are transferred to the sampling inspection station, the operator uses offline testing equipment to inspect the dimensional accuracy and surface quality of the parts; after the inspection is completed, the operator scans the part code with a handheld barcode scanner and enters the inspection result (pass / fail) into the system. If the inspection fails, the central control unit updates the part status to "unqualified", generates a non-conforming product report, stores it in the quality traceability system database, and the operator removes the non-conforming part from the production line for processing. If the inspection is successful, the operator scans the code again with a handheld barcode scanner. The central control unit receives the part code obtained from the scan and generates a return line request. Return-to-line process: Based on the received part code, the central control unit retrieves the entire historical processing data of the part (processing equipment, processing parameters, processing time, etc. for each process) from the quality traceability system database, and verifies the validity of the data (e.g., whether the part code exists and whether the historical data is complete). After successful verification, the central control unit marks the part's status information as "qualified for return-to-line" and writes it to the real-time data area corresponding to the sampling inspection station. Subsequently, the unloading and handling robot is dispatched to pick up the part from the sampling inspection station, and the corresponding production data record is transmitted to the data area of ​​the unloading and handling robot. The central control unit analyzes the vehicle model information in the data area of ​​the unloading and handling robot, and dispatches the unloading and handling robot to classify and transfer the part to the corresponding unloading station, completing the return-to-line process.

[0036] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. 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 invention.

[0037] like Figure 2 As shown, the following are embodiments of the multi-model mixed-line production method for automotive parts provided in this disclosure. This system belongs to the same inventive concept as the multi-model mixed-line production system for automotive parts in the above embodiments. For details not described in detail in the embodiments of the multi-model mixed-line production method for automotive parts, please refer to the embodiments of the multi-model mixed-line production system for automotive parts described above.

[0038] The method includes the following steps: S1. Set a vehicle formula containing processing parameters for at least two vehicle models through the central control unit; It should be noted that by setting vehicle formulas that include processing parameters for at least two vehicle models through the central control unit, data support is provided for mixed-line production, ensuring production diversity and flexibility; S2. Bind a unique identifier to each material entering the production line and create a corresponding production data record in the central control unit; It should be noted that by binding a unique identifier to each individual material entering the production line and creating a corresponding production data record, unique identification of parts and full-process data tracking are achieved, providing a basis for production scheduling and quality traceability. S3. The central control unit assigns target programmable processing units and vehicle processing programs to individual materials based on the vehicle model formula and the status of each programmable processing unit, and controls the material handling device to perform loading processing. It should be noted that this step achieves the rational allocation of production tasks and automated processing, thereby improving production efficiency and equipment utilization. S4. After the individual material is processed, the central control unit, based on the production data records and the availability status of the downstream workstations in the material buffer and sorting device, schedules the material handling device to transfer the individual material to the next target workstation and updates the production data records simultaneously. It should be noted that this step enables dynamic scheduling of individual materials and real-time data updates during the production process, ensuring the continuity of production and the accuracy of data. S5. For parts arriving at the buffer area, the central control unit controls the sorting device to classify and transport the parts to the corresponding unloading station based on the vehicle model information in the production data record, or to transfer the parts to the sampling inspection station according to the sampling inspection instruction. It should be noted that this step enables the classification and management of parts and quality control, thereby improving production flexibility and quality stability. S6. For parts that pass inspection at the sampling station, the central control unit retrieves complete production data records based on the unique identification information and controls the handling device to reconnect the parts to the production line, and then classifies and transfers them to the corresponding unloading station according to the vehicle model information. It should be noted that this step enables the rapid return and sorting of qualified parts from the sampling inspection, thereby improving production efficiency and quality control.

[0039] This embodiment achieves flexible production of parts for multiple vehicle models through intelligent scheduling and real-time data tracking, which improves production efficiency, reduces equipment downtime, optimizes quality control, and lowers production costs.

[0040] Furthermore, as a refinement and extension of the specific implementation of the above embodiments, in order to fully illustrate the specific implementation process in this embodiment, another method for multi-model mixed-line production of automotive parts is provided, which includes the following steps: S1. Set the vehicle formula containing processing parameters for at least two vehicle models through the central control unit; the specific steps of step S1 are as follows: S11. Through the human-machine interface, set the planned vehicle models and planned output for at least two programmable processing units and unloading stations on the production line; S12. Issue production setting check commands through the human-machine interface to check the planned vehicle models and planned output: Determine whether the vehicle model set by the same programmable processing unit or unloading station is one of the vehicle model formulas supported by the system, and determine whether there is any logical conflict. If both conditions are met, proceed to step S13; If either condition is not met, an alarm will be generated on the human-computer interaction interface, the setting will be prevented from taking effect, and the process will end. S13. The central control unit activates the settings for the planned vehicle models and planned production volumes; S14. Determine the production mode based on the number of vehicle models that are in effect: If only one vehicle model is affected, then the single-model production mode will be entered. If more than one model is affected, the mixed-line production mode will be activated. For example, the operator sets the planned vehicle models and planned output for each processing unit and unloading station through a human-machine interface. This setting interface is as follows: Figure 4 As shown; after the settings are completed, a check command can be issued, and the central control unit will perform logic verification. S2. Assign a unique identifier to each individual material entering the production line and create a corresponding production data record in the central control unit; the specific steps in step S2 are as follows: S21. Control the loading and handling robot to move to the gripping position, and start the fixed barcode scanner on the end effector of the loading and handling robot to read the part code of the blank; S22. The central control unit determines whether the part code has been successfully read and verified: If so, the part code is used as the unique identifier to create an initial production data record and store it in the first data area, and then the fetching is performed; If not, an audible and visual alarm will be triggered and a prompt will be displayed on the human-machine interface. The correct part code will be manually entered through the human-machine interface. Based on the manually entered part code, an initial production data record will be created and stored in the first data area. For example, the operator enters the vehicle model formula management interface through the human-machine interface, sets CNC1 to process vehicle model A (planned output of 1000 pieces), CNC2 to process vehicle model B (planned output of 800 pieces), CNC3 to process vehicle model A (planned output of 500 pieces), and CNC4 to process vehicle model C (planned output of 600 pieces). The first unloading station corresponds to vehicle model A and vehicle model B, and the second unloading station corresponds to vehicle model C. Click "Production Setting Check". The central control unit verifies that there are no logical conflicts in the settings, and the interface displays "Verification passed". Click "Production Settings Take Effect" to synchronize the settings parameters to the production data area of ​​the central control unit. Since there are 3 models that are effective, the system will automatically start the mixed production mode. The double material frames at the loading station are filled with blanks corresponding to model A, model B, and model C. Each blank is accompanied by a unique part code. After the central control unit is activated, the loading and handling robot moves to the gripping position and starts the fixed barcode scanner to read the part code of the first blank part (e.g., part code P001, compatible with vehicle model A). The complete logic flow of its barcode scanning and gripping decision is as follows: Figure 3As shown, the barcode scan was successful and the verification passed. The central control unit created the initial production data record for P001 in the first data area (part code: P001, vehicle model: A, online time: 202X-XX-XX XX:XX:XX, status: pending processing), and the robot picked up the blank part. S3. The central control unit assigns target programmable processing units and vehicle processing programs to individual materials based on the vehicle model formula and the status of each programmable processing unit, and controls the material handling device to perform loading processing; the specific steps of the central control unit assigning target programmable processing units and vehicle processing programs to individual materials based on the vehicle model formula and the status of each programmable processing unit in step S3 are as follows: S31. The central control unit maintains a list containing the status of all programmable processing units in real time; the status of the programmable processing units includes idle, processing, and fault. S32. When there are individual materials to be processed, the central control unit queries the list and selects the first programmable processing unit that is in an idle state as the target processing unit; S33. Generate a transport instruction containing the target unit location information, and schedule the loading and transporting robot to transport the material individual bound with the unique identification information to the target processing unit; S4. After the individual material is processed, the central control unit, based on the production data records and the availability status of downstream workstations in the material buffer and sorting device, schedules the material handling device to transfer the individual material to the next target workstation and simultaneously updates the production data records; the specific steps for simultaneously updating the production data records in step S4 are as follows: S41. When the equipment A corresponding to the previous physical position of a material on the production line is moved to the equipment B corresponding to the next target workstation, a data migration event is triggered; S42. The central control unit uses the unique identifier of each material as an index to search for the current production data record that is bound to the material and corresponds to device A in the pre-maintained centralized data storage area; S43. The central control unit copies or associates the current production data record to the data partition corresponding to device B in the centralized data storage area, and updates the status information to reflect that the material individual is located in device B. At the same time, it archives or marks the original production data record corresponding to device A as a historical record. For example, the central control unit queries the CNC machining center status list, finds that CNC1 is in an idle state, assigns the target machining unit CNC1 and the machining program of vehicle model A to P001, and generates a transport instruction; The loading and handling robot transports P001 to CNC1 according to the instructions. CNC1 receives the processing program and processing parameters and starts processing. The central control unit migrates the production data record of P001 from the first data area to the corresponding data partition of CNC1, updates the status to "processing", and records the processing start time. After CNC1 finishes machining, it sends a "machining complete" signal to the central control unit. The central control unit checks the status of the assembly buffer station and finds that the first assembly buffer station is idle. It then dispatches the unloading and handling robot to move P001 from CNC1 and transfer it to the first assembly buffer station. The central control unit triggers a data migration event, migrating the production data record of P001 from the data partition corresponding to CNC1 to the data partition corresponding to the first assembly buffer station, updating the status to "assembly in buffer", and recording the processing end time and CNC1 processing parameters. Repeat the above process, the loading and handling robot grabs the subsequent blank parts in sequence, and the central control unit allocates processing units according to the model of the part and the status of the equipment: parts of model B are allocated to CNC2, parts of model A are preferentially allocated to the idle CNC1 or CNC3, and parts of model C are allocated to CNC4. After each part is processed, it is transferred to the assembly buffer station by the unloading and handling robot, and the production data record is updated in real time. S5. For parts arriving at the buffer area, the central control unit, based on the vehicle model information in the production data record, controls the sorting device to classify and transport the parts to the corresponding unloading station, or, according to the sampling inspection instruction, transfers the parts to the sampling inspection station; the specific steps of step S5 are as follows: S51. The central control unit determines whether parts located at the assembly buffer station need to be sampled for inspection; If so, proceed to step S52; If not, proceed to step S53; S52. The material handling robot of the scheduling material handling device moves the part to the sampling inspection station and transfers the corresponding production data record from the assembly buffer station data area to the sampling inspection station data area; S53. The central control unit executes the following classification logic: Read the vehicle model information from the production data record of the part, and according to the preset vehicle model-unloading station mapping relationship, schedule the unloading robot of the material handling device to classify and transfer the part to the corresponding unloading station; For example, the unloading and handling robot picks up P001 from the first assembly buffer station. The central control unit determines that P001 does not need to be sampled (the sampling frequency has not been reached), reads the vehicle model information (vehicle model A) in its production data record, and schedules the unloading and handling robot to transfer P001 to the first unloading station according to the vehicle model-unloading station mapping relationship. The counting sensor at the first unloading station detects P001 and sends a "complete off-line" signal to the central control unit. The central control unit updates the production data record status of P001 to "qualified off-line" and adds the actual output to the production data of model A. When the unloading and handling robot picks up the 50th part (part code P050, vehicle model B), the central control unit determines that it needs to be inspected according to the sampling inspection rules, and dispatches the unloading and handling robot to move P050 to the sampling inspection station. At the same time, the production data record of P050 is transferred from the assembly cache station data area to the sampling inspection station data area, and the status is updated to "pending inspection". S6. For parts that pass inspection at the sampling station, the central control unit retrieves complete production data records based on the unique identifier information and controls the handling device to reconnect the parts to the production line, and then transfers them to the corresponding unloading station according to the vehicle model information; the specific steps of step S6 are as follows: S61. At the sampling inspection station, the operator uses a handheld barcode scanner to scan the qualified parts. The central control unit receives the part code obtained from the scan and generates a return line request. S62. The central control unit retrieves the entire historical processing data of the part from the quality traceability system database based on the part code, and verifies its validity; It should be noted that for parts that pass inspection, operators must manually scan the barcode at the inspection station to confirm receipt and initiate a return shipment. The interface for this return shipment is as follows: Figure 7 As shown; after the central control unit verifies the information, it can schedule the handling device to complete the return and sorting process. S63. After verification, the central control unit marks the status information of the part as qualified and writes it into the real-time data area corresponding to the sampling inspection station; S64. The material handling robot in the scheduling material handling device picks up the part from the sampling inspection station and records the corresponding production data into the data area corresponding to the material handling robot. S65. The central control unit analyzes the data in the data area of ​​the unloading and handling robot, and according to the vehicle model information, schedules the unloading and handling robot to classify and transfer the parts to the corresponding unloading station to complete the return line offline; For example, the operator inspects P050 at the sampling inspection station. After confirming that it is qualified, the operator scans the part code of P050 with a handheld barcode scanner. The central control unit receives the scan data and generates a return line request. The central control unit retrieves the quality traceability system database based on part code P050 to obtain its full-process processing data (CNC2 processing, processing parameters, processing time, etc.) and verifies the validity of the data. The central control unit marks the status information of P050 as "qualified return line" and writes it into the real-time data area corresponding to the sampling inspection station; The dispatching unloading and handling robot picks up P050 from the sampling inspection station and records its production data into the corresponding data area of ​​the unloading and handling robot. The central control unit analyzes the vehicle information (vehicle model B) in the data area, and dispatches the material handling robot to move P050 to the first unloading station. The counting sensor at the first unloading station reports "offline completed". The central control unit updates the production data record status of P050 to "return line qualified offline", completing the entire production process.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-model mixed-line production system for automotive parts, characterized in that, include: At least two programmable processing units are used to process materials according to different production formulas to form parts corresponding to different car models; The material buffering and sorting device includes at least one assembly buffer station, at least one unloading station, and a sampling inspection station; the assembly buffer station is used to buffer processed parts from the programmable processing unit, the unloading station is used for qualified parts to be unloaded, and the sampling inspection station is used for offline inspection and return of parts. Material handling equipment is used to move materials between programmable processing units and various workstations; The central control unit communicates with the material buffer and sorting device, the material handling device, and each programmable processing unit. The central control unit is configured to execute the following logic: Each material is assigned a unique identifier, and a corresponding production data record is created. Based on the predefined formulas for each vehicle model, a target vehicle model processing program is assigned to each individual material, and the material handling device is scheduled to transport the individual material to a selected programmable processing unit. In response to every change in the physical location of an individual material, the corresponding production data record is dynamically updated to reflect the current process status, location information, and vehicle model information in real time. Based on real-time production data records of individual materials, the material handling device is scheduled to move individual materials from the programmable processing unit to the material buffer and sorting device. Based on preset rules or external instructions and the final production data records of individual materials, the system controls the material buffer and sorting device to classify and transport qualified parts to the corresponding unloading station, or to transfer designated parts to the sampling inspection station. It can also re-integrate qualified parts into the production process and guide them to the corresponding unloading station.

2. The multi-model mixed-line production system for automotive components according to claim 1, characterized in that, The programmable machining unit adopts a CNC machining center; The material handling device includes a loading robot and an unloading robot; The system also includes a loading station located at the beginning of the production line; The loading station, CNC machining center, and material flow direction along the production line are set up in sequence, while the sampling inspection station and unloading station are set downstream of the assembly buffer station. The loading and handling robot is located downstream of the loading station and is used to pick up the blanks from the loading station and transport them to any CNC machining center. The material handling robot is located downstream of the CNC machining center and is used to remove the machined parts from the CNC center and transport them to the assembly buffer station. The sampling inspection station and at least one unloading station are located at the end of the production line.

3. The multi-model mixed-line production system for automotive components according to claim 1, characterized in that, It also includes a human-machine interface that communicates with the central control unit; The end effector of the material handling robot is equipped with a fixed barcode scanner, which is used to read the unique part code set on the blank as a unique identification information. The central control unit is connected to the fixed barcode scanner and executes the following scanning logic: If the barcode scan is successful and the part code verification passes, the grabbing action will be executed and a production data record will be created. If scanning fails, an alarm is triggered and manual entry of the part code is allowed through the human-machine interface. After the manual entry is completed, a production data record is created based on the manually entered part code. The human-machine interface is also used to provide interactive functions such as vehicle formula management, production control, real-time monitoring of parts status, and sampling inspection and return management.

4. A method for multi-model mixed-line production of automotive components based on the system described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Set a vehicle formula containing processing parameters for at least two vehicle models through the central control unit; S2. Bind a unique identifier to each material entering the production line and create a corresponding production data record in the central control unit; S3. The central control unit assigns target programmable processing units and vehicle processing programs to individual materials based on the vehicle model formula and the status of each programmable processing unit, and controls the material handling device to perform loading processing. S4. After the individual material is processed, the central control unit, based on the production data records and the availability status of the downstream workstations in the material buffer and sorting device, schedules the material handling device to transfer the individual material to the next target workstation and updates the production data records simultaneously. S5. For parts arriving at the buffer area, the central control unit controls the sorting device to classify and transport the parts to the corresponding unloading station based on the vehicle model information in the production data record, or to transfer the parts to the sampling inspection station according to the sampling inspection instruction. S6. For parts that pass inspection at the sampling station, the central control unit retrieves complete production data records based on the unique identification information and controls the handling device to reconnect the parts to the production line, and then classifies and transfers them to the corresponding unloading station according to the vehicle model information.

5. The method for multi-model mixed-line production of automotive components according to claim 4, characterized in that, The specific steps of step S1 are as follows: S11. Through the human-machine interface, set the planned vehicle models and planned output for at least two programmable processing units and unloading stations on the production line; S12. Issue production setting check commands through the human-machine interface to check the planned vehicle models and planned output: Determine whether the vehicle model set by the same programmable processing unit or unloading station is one of the vehicle model formulas supported by the system, and determine whether there is any logical conflict. If both conditions are met, proceed to step S13; If either condition is not met, an alarm will be generated on the human-computer interaction interface, the setting will be prevented from taking effect, and the process will end. S13. The central control unit activates the settings for the planned vehicle models and planned production volumes; S14. Determine the production mode based on the number of vehicle models that are in effect: If only one vehicle model is affected, then the single-model production mode will be entered. If more than one model is affected, the mixed-line production mode will be activated.

6. The method for multi-model mixed-line production of automotive components according to claim 4, characterized in that, The specific steps in step S2 are as follows: S21. Control the loading and handling robot to move to the gripping position, and start the fixed barcode scanner on the end effector of the loading and handling robot to read the part code of the blank; S22. The central control unit determines whether the part code has been successfully read and verified: If so, the part code is used as the unique identifier to create an initial production data record and store it in the first data area, and then the fetching is performed; If not, an audible and visual alarm will be triggered and a prompt will be displayed on the human-machine interface. The correct part code will be manually entered through the human-machine interface. Based on the manually entered part code, an initial production data record will be created and stored in the first data area.

7. The method for multi-model mixed-line production of automotive components according to claim 4, characterized in that, In step S3, the central control unit assigns the target programmable processing unit and the vehicle processing program to each material based on the vehicle model formula and the status of each programmable processing unit. The specific steps are as follows: S31. The central control unit maintains a list containing the status of all programmable processing units in real time; the status of the programmable processing units includes idle, processing, and fault. S32. When there are individual materials to be processed, the central control unit queries the list and selects the first programmable processing unit that is in an idle state as the target processing unit; S33. Generate a transport instruction containing the target unit location information, and schedule the loading and transporting robot to transport the material individual with the unique identification information to the target processing unit.

8. The method for multi-model mixed-line production of automotive parts according to claim 4, characterized in that, The specific steps for synchronously updating production data records in step S4 are as follows: S41. When the equipment A corresponding to the previous physical position of a material on the production line is moved to the equipment B corresponding to the next target workstation, a data migration event is triggered; S42. The central control unit uses the unique identifier of each material as an index to search for the current production data record that is bound to the material and corresponds to device A in the pre-maintained centralized data storage area; S43. The central control unit copies or associates the current production data record to the data partition corresponding to device B in the centralized data storage area, and updates the status information to reflect that the material individual is located in device B. At the same time, it archives or marks the original production data record corresponding to device A as a historical record.

9. The method for multi-model mixed-line production of automotive parts according to claim 4, characterized in that, The specific steps of step S5 are as follows: S51. The central control unit determines whether parts located at the assembly buffer station need to be sampled for inspection; If so, proceed to step S52; If not, proceed to step S53; S52. The material handling robot of the scheduling material handling device moves the part to the sampling inspection station and transfers the corresponding production data record from the assembly buffer station data area to the sampling inspection station data area; S53. The central control unit executes the following classification logic: The vehicle model information in the production data record of the part is read, and the unloading robot of the material handling device is scheduled to classify and transfer the part to the corresponding unloading station according to the preset vehicle model-unloading station mapping relationship.

10. The method for multi-model mixed-line production of automotive parts according to claim 4, characterized in that, The specific steps of step S6 are as follows: S61. At the sampling inspection station, the operator uses a handheld barcode scanner to scan the qualified parts. The central control unit receives the part code obtained from the scan and generates a return line request. S62. The central control unit retrieves the entire historical processing data of the part from the quality traceability system database based on the part code, and verifies its validity; S63. After verification, the central control unit marks the status information of the part as qualified and writes it into the real-time data area corresponding to the sampling inspection station; S64. The material handling robot in the scheduling material handling device picks up the part from the sampling inspection station and records the corresponding production data into the data area corresponding to the material handling robot. S65. The central control unit analyzes the data in the data area of ​​the unloading and handling robot, and according to the vehicle model information, schedules the unloading and handling robot to classify and transfer the parts to the corresponding unloading station to complete the return line offline.

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