Engine oil pan forming system and forming method

Abstract

The invention provides an engine oil pan forming system and method, and relates to the technical field of machining, the engine oil pan forming system comprises a rotary workbench, a unified reference positioning mechanism, a pressure sensing assembly, a central control system, a visual positioning assembly and a mechanical arm assembly, and is characterized in that a plurality of machining stations are distributed in the circumferential direction of the rotary workbench; the processing stations at least comprise a forming station, a trimming-flanging station and a punching station; the unified reference positioning mechanism comprises positioning reference blocks arranged on all machining stations. Through the integrated design of the rotary workbench and the unified reference, the workpiece is clamped at a time to complete whole-process machining, positioning deviation accumulation caused by repeated clamping in traditional step-by-step machining is thoroughly avoided, the pressure sensing assembly is linked with the central control system, the clamping force is adjusted in real time, it is ensured that the workpiece in each process is stably positioned, and the machining efficiency is improved. The overall dimensional tolerance of a product is controlled within a high-precision range, and the core problem that traditional machining dimensional precision is insufficient is solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to an engine oil pan forming system and forming method. Background Technology

[0002] The current processing of engine oil pans generally adopts a step-by-step production mode, requiring multiple independent machines such as forming machines, trimming machines, and punching machines. The workpiece needs to be clamped and transferred multiple times between these machines to complete the entire processing. The positioning method mainly relies on the hard contact positioning of mechanical reference blocks. The loading and unloading operations are mostly assisted by manual labor or simple robotic arms. The punching process uses mechanical limiting structures to achieve hole positioning. The processing flow is decentralized and relies on manual intervention. The existing technology has the following drawbacks: First, multiple clamping operations lead to inconsistent positioning references and cumulative deviations, making it difficult to control the overall dimensional tolerance of the product and failing to meet the requirements of high-precision processing. Second, traditional mechanical positioning methods are poorly adaptable to curved oil pans, and it is difficult to ensure that the hole axis is perpendicular to the workpiece curvature direction during punching, resulting in low hole position accuracy. Third, the loading and unloading process lacks precise positioning and fine-tuning mechanisms, and the deviation in sheet placement directly affects the consistency of subsequent processing references. Furthermore, the high degree of manual intervention leads to low production efficiency and poor stability in batch production. Therefore, this invention proposes an engine oil pan forming system and forming method to solve the problems existing in the prior art. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes an engine oil pan forming system and method. Through an integrated design of a rotary worktable and a unified datum, the entire process of machining can be completed in a single clamping operation, completely avoiding the accumulation of positioning deviations caused by repeated clamping in traditional step-by-step machining. The pressure sensing component is linked with the central control system to adjust the clamping force in real time, ensuring stable positioning of the workpiece in each process and keeping the overall dimensional tolerance of the product within a high-precision range. This solves the core problem of insufficient dimensional accuracy in traditional machining.

[0004] To achieve the objectives of this invention, the following technical solution is provided: an engine oil pan forming system, comprising a rotary worktable, a unified reference positioning mechanism, a pressure sensing component, a central control system, a vision positioning component, and a robotic arm component. Multiple processing stations are arranged circumferentially along the rotary worktable, and each processing station includes at least a forming station, a trimming-flanging station, and a punching station. The unified reference positioning mechanism includes positioning reference blocks disposed at each processing station, each positioning reference block adopting the same reference surface design and being rigidly connected to the rotary worktable. The pressure sensing component is configured at each processing station for real-time monitoring of the workpiece clamping pressure. The central control system is connected to the pressure sensing component and is used to adjust the clamping force of the positioning reference block according to the pressure monitoring data; the vision positioning component includes a first vision unit and a second vision unit, the first vision unit is used for plate feeding positioning, and the second vision unit is used for punching positioning; the robotic arm component is linked with the first vision unit and the central control system and is used for plate feeding and finished workpiece unloading. A further improvement is that the second vision unit includes a laser projection component and an image acquisition component. The laser projection component is used to project a positioning grid onto the surface of the workpiece, and the image acquisition component is used to acquire images of the positioning grid and transmit them to the central control system.

[0005] A further improvement is that the punching station is equipped with a servo punching mechanism, which is connected to the central control system to achieve X / Y axis compensation and punching angle adjustment.

[0006] A further improvement is that the rotary table is equipped with a servo drive component to drive the rotary table to rotate precisely with a rotation accuracy of ≤ ±0.01mm.

[0007] A further improvement is that the robotic arm assembly includes a loading robotic arm and a unloading robotic arm, which operate independently and are both equipped with a flexible gripping mechanism.

[0008] A method for forming an engine oil pan includes the following steps: S1: Loading and positioning. The robotic arm component identifies the position of the sheet metal through the first vision unit, grabs the sheet metal and places it on the positioning reference block of the forming station. The pressure sensing component monitors the contact pressure, and the central control system fine-tunes the position of the sheet metal according to the pressure data to complete the positioning. S2: Multi-station integrated processing, the rotary table drives the workpiece to rotate sequentially to the forming station, trimming-flanging station and punching station. Each station is positioned by a unified reference positioning mechanism. The central control system adjusts the clamping force according to the real-time data of the pressure sensing components to position the workpiece. S3: Vision-assisted punching. The second vision unit acquires the workpiece image and calculates the hole position deviation. The central control system drives the punching mechanism to perform position compensation and complete the punching. S4: Unloading. The robotic arm assembly removes the processed workpiece, completing the entire processing step.

[0009] A further improvement is made in S1, where the fine-tuning of the sheet position is achieved through a loading / unloading positioning fine-tuning algorithm, the formula of which is: ΔPx = Pxt - Pxa, ΔPy = Pyt - Pya, Where: ΔPx is the fine adjustment amount in the X-axis direction, in mm; ΔPy is the fine adjustment amount in the Y-axis direction, in mm; Pxt is the theoretical X-coordinate of the sheet material, in mm; Pxa is the actual X-coordinate of the sheet material, in mm; Pyt is the theoretical Y-coordinate of the sheet material, in mm; Pya is the actual Y-coordinate of the sheet material, in mm.

[0010] A further improvement is that in S2, the preset threshold for the clamping force adjustment is F0. When the monitored pressure F < F0, the central control system controls the positioning reference block to increase the clamping force to F ≥ F0, and the value of F0 is in the range of 30-80N.

[0011] A further improvement is made in S3, where the hole position deviation is calculated using a punching positioning deviation compensation algorithm, the formula of which is: ΔX = Xt - Xa, ΔY = Yt - Ya, Where: ΔX is the deviation value in the X-axis direction, in mm; ΔY is the deviation value in the Y-axis direction, in mm; Xt is the theoretical X coordinate of the hole position, in mm; Xa is the actual X coordinate of the hole position, in mm; Yt is the theoretical Y coordinate of the hole position, in mm; Ya is the actual Y coordinate of the hole position, in mm.

[0012] A further improvement is that S3 also includes adaptive adjustment of the punching angle: the second vision unit collects the curved surface contour data of the punching area of ​​the workpiece, the central control system calls the curved surface curvature angle compensation algorithm, calculates the punching angle compensation value based on the curved surface contour data of the engine oil pan, and then drives the servo punching mechanism to adjust the punching direction so that the punching axis is consistent with the curvature normal direction of the punching position of the curved surface.

[0013] The beneficial effects of this invention are as follows: 1. This invention achieves the completion of all processes in one workpiece clamping through an integrated design of a rotary worktable and a unified benchmark. It completely avoids the accumulation of positioning deviations caused by repeated clamping in traditional step-by-step processing. The pressure sensing component is linked with the central control system to adjust the clamping force in real time, ensuring stable workpiece positioning in each process and keeping the overall dimensional tolerance of the product within a high-precision range. This solves the core problem of insufficient dimensional accuracy in traditional processing.

[0014] 2. This invention integrates a vision positioning component and a servo punching mechanism at the punching station. It achieves precise hole position compensation through laser positioning grid and deviation compensation algorithm. For curved oil pans, it can automatically adjust the punching angle to ensure that the hole axis is perpendicular to the curvature direction. The punching position accuracy is significantly improved compared with traditional mechanical positioning, breaking through the technical bottleneck of precision punching of complex curved workpieces.

[0015] 3. This invention achieves precise positioning and fine-tuning of sheet metal feeding through the coordinated linkage of robotic arm components with vision positioning and pressure sensing, ensuring consistency of processing benchmarks from the source. The fully automated design replaces manual intervention, significantly improving production efficiency, reducing labor costs and operational errors, and is suitable for the stable mass production of engine oil pans. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system of the present invention; Figure 2 This is a flowchart of the method of the present invention. Detailed Implementation

[0017] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Example 1

[0018] according to Figure 1 , 2 As shown, this embodiment proposes an engine oil pan forming system, including a rotary worktable, a unified reference positioning mechanism, a pressure sensing component, a central control system, a vision positioning component, and a robotic arm component. Multiple processing stations are arranged circumferentially along the rotary worktable, and the processing stations include at least a forming station, a trimming-flanging station, and a punching station. The multi-station integrated design enables the workpiece to complete all processing steps in one clamping, avoiding the time-consuming multiple transfers in traditional step-by-step processing and reducing the risk of workpiece collision damage. The circumferential arrangement of the stations makes the processing flow continuous, significantly shortening the single-piece processing cycle and improving the cycle stability of batch production.

[0019] The unified reference positioning mechanism includes positioning reference blocks installed at each processing station. Each positioning reference block adopts the same reference surface design and is rigidly connected to the rotary table. The identical reference surface design ensures that the positioning references at each station are completely consistent, eliminating the accumulation of deviations caused by repeated clamping and improving product dimensional consistency. The rigid connection structure prevents the positioning reference blocks from displacing or deforming due to processing vibrations, ensuring the stability of positioning accuracy during long-term operation. The pressure sensing components are configured at each processing station to monitor the workpiece clamping pressure in real time. The real-time monitoring function can promptly detect clamping loosening problems, avoiding an increase in scrap rate due to workpiece displacement during processing. The pressure data provides a quantitative basis for clamping force optimization, adapting to the clamping requirements of plates of different thicknesses and materials, and enhancing the system's versatility. The central control system is signal-connected to the pressure sensing components and is used to adjust the clamping force of the positioning reference blocks based on the pressure monitoring data. Automatic adjustment of the clamping force requires no manual intervention, reducing operational difficulty and avoiding human adjustment errors. It dynamically adapts to the force requirements of different processes such as forming and trimming, preventing both over-clamping leading to workpiece deformation and under-clamping leading to positioning failure.

[0020] The vision positioning component includes a first vision unit and a second vision unit. The first vision unit is used for plate feeding positioning, and the second vision unit is used for punching positioning. The two vision units have clear division of labor, respectively ensuring the two key links of feeding benchmark and punching accuracy, thereby improving the overall processing quality. The vision positioning method replaces the traditional mechanical limit, adapts to the processing requirements of oil pans of different specifications, and reduces changeover and adjustment time.

[0021] The robotic arm assembly is linked with the first vision unit and the central control system for loading sheet metal and unloading finished workpieces. The linkage design automates loading and unloading, completely replacing manual operation, reducing labor costs and safety hazards. The robotic arm accurately executes positioning commands, avoiding positional deviations when manually placing sheet metal, and ensuring consistency of subsequent processing benchmarks.

[0022] The second vision unit includes a laser projection component and an image acquisition component. The laser projection component is used to project a positioning grid onto the workpiece surface, and the image acquisition component is used to acquire the positioning grid image and transmit it to the central control system. The positioning grid provides a precise reference for hole position identification, greatly improving the accuracy of hole position coordinate extraction from the image acquisition and reducing the impact of ambient light interference. The grid image can intuitively reflect the workpiece surface contour, providing reliable data support for the angle adjustment of the curved oil pan.

[0023] The punching station is equipped with a servo punching mechanism, which is connected to the central control system to achieve X / Y axial compensation and punching angle adjustment. X / Y axial compensation can correct hole position deviation in real time, improving the punching position accuracy by more than 50% compared with traditional mechanical positioning. The angle adjustment function breaks through the technical bottleneck of punching curved workpieces, ensuring that the hole axis is consistent with the curved surface normal, and meeting the sealing requirements of the assembly surface.

[0024] The rotary table is equipped with a servo drive assembly to drive it to rotate precisely with a rotation accuracy of ≤ ±0.01mm. The high-precision rotation ensures that the workpiece has minimal switching and positioning error between workstations, guaranteeing dimensional accuracy at process connections. The servo drive has a rapid response, reducing workstation switching time to less than 0.5s, further improving overall production efficiency.

[0025] The robotic arm assembly includes a loading robotic arm and a unloading robotic arm, which operate independently and are each equipped with a flexible gripping mechanism. The independent operation design allows the loading and unloading actions to be performed in parallel, avoiding process waiting caused by a single robotic arm and improving the production line cycle time. The flexible gripping mechanism can prevent surface scratches on the sheet metal and finished workpieces, ensuring product appearance quality and assembly sealing.

[0026] A method for forming an engine oil pan includes the following steps: S1: Loading and Positioning. The robotic arm component identifies the sheet metal position through the first vision unit, picks up the sheet metal, and places it on the positioning reference block at the forming station. The pressure sensor component monitors the contact pressure, and the central control system fine-tunes the sheet metal position based on the pressure data to complete the positioning. The coordinated fine-tuning of vision recognition and pressure monitoring ensures sheet metal placement accuracy of ±0.02mm, laying a precise benchmark for subsequent processing. The automated positioning process eliminates the need for manual calibration, reducing reliance on operator skill levels and improving batch production stability. Sheet metal position fine-tuning is achieved through a loading and unloading positioning fine-tuning algorithm. The algorithm formulas are: ΔPx=Pxt-Pxa, ΔPy=Pyt-Pya, where: ΔPx is the fine-tuning amount in the X-axis direction (mm); ΔPy is the fine-tuning amount in the Y-axis direction (mm); Pxt is the theoretical X-coordinate of the sheet metal placement (mm); Pxa is the actual X-coordinate of the sheet metal placement (mm); Pyt is the theoretical Y-coordinate of the sheet metal placement (mm); Pya is the actual Y-coordinate of the sheet metal placement (mm). The algorithm has a simple logic and fast calculation speed (single calculation time ≤10ms), which can realize real-time and rapid fine adjustment of the plate position; the quantified fine adjustment amount ensures that the adjustment process is controllable, avoids positioning deviation caused by over-adjustment or under-adjustment, and improves the reliability of the algorithm.

[0027] S2: Multi-station integrated processing. The rotary table drives the workpiece to the forming station, trimming-flanging station, and punching station in sequence. Each station is positioned by a unified reference positioning mechanism. The central control system adjusts the clamping force based on real-time data from the pressure sensor components to position the workpiece. Sequential rotation processing ensures seamless connection between each process, reduces secondary positioning errors during workpiece transfer, and improves the overall dimensional accuracy of the product. Stable positioning throughout the process ensures the consistency of the reference for forming, trimming, and punching processes, keeping the product dimensional tolerance within ±0.03mm. The preset threshold for clamping force adjustment is F0. When the monitored pressure F < F0, the central control system controls the positioning reference block to increase the clamping force until F ≥ F0. The value of F0 ranges from 30 to 80N. The threshold range of 30-80N adapts to the clamping requirements of sheets with different thicknesses (1-5mm), enhancing the versatility of the method. The threshold-triggered adjustment mechanism ensures that the clamping force is always within the effective range, preventing both over-clamping leading to workpiece deformation and under-clamping leading to displacement.

[0028] S3: Vision-assisted punching. The second vision unit acquires workpiece images and calculates hole position deviations. The central control system drives the punching mechanism to perform position compensation and complete the punching. Vision-assisted compensation can correct minor deformation errors during workpiece processing, achieving a punching position accuracy of ±0.015mm. No manual pre-adjustment of hole positions is required, adapting to the rapid changeover needs of small-batch, multi-variety production and reducing production preparation time. Hole position deviations are calculated using a punching positioning deviation compensation algorithm. The algorithm formulas are: ΔX=Xt-Xa, ΔY=Yt-Ya, where: ΔX is the deviation value in the X-axis direction (mm); ΔY is the deviation value in the Y-axis direction (mm); Xt is the theoretical X-coordinate of the hole position (mm); Xa is the actual X-coordinate of the hole position (mm); Yt is the theoretical Y-coordinate of the hole position (mm); Ya is the actual Y-coordinate of the hole position (mm). The algorithm directly quantifies the hole position deviation, providing accurate data support for the compensation action, ensuring that the compensation effect is verifiable and traceable. The formulas are simple, facilitating system programming and subsequent maintenance and optimization, reducing the difficulty of technology implementation. It also includes adaptive adjustment of the punching angle: the second vision unit collects the curved surface contour data of the punching area of ​​the workpiece, the central control system calls the curved surface curvature angle compensation algorithm, calculates the punching angle compensation value based on the curved surface contour data of the engine oil pan, and then drives the servo punching mechanism to adjust the punching direction so that the punching axis is consistent with the curvature normal direction of the punching position on the curved surface; the adaptive adjustment function completely solves the problem of punching angle deviation of the curved oil pan, the perpendicularity error of the hole axis is ≤0.1°, which meets the assembly requirements; the compensation value is dynamically calculated based on the curved surface contour data, which can adapt to complex curved surface workpieces with different curvatures and expand the applicability of the method.

[0029] S4: Unloading. The robotic arm assembly removes the processed workpiece, completing the entire processing step. Automated unloading avoids scratches or damage to finished products caused by manual handling, increasing the finished product qualification rate to over 99.5%. The unloading action is linked with the processing steps, achieving fully unmanned operation and reducing production labor costs and management difficulty. Example 2

[0030] according to Figure 1 , 2 As shown, this embodiment proposes an engine oil pan forming system and method, applied to the planar forming of engine oil pans: System Configuration: The rotary table is driven by a servo motor (model: MS1H1-10B30CB-A331Z), with a rotation accuracy of ±0.005mm; the processing stations are evenly distributed around the circumference of the table at 120° intervals; the positioning reference blocks are made of 45# steel, with a reference surface flatness ≤0.002mm; the pressure sensing components are miniature pressure sensors (model: PT124G-111), with two sensors configured for each station, and a measurement accuracy of ±0.1N; the central control system is a PLC controller (model: S7-1200); the first vision unit is an industrial camera (model: MV-CA013-21GM), and the second vision unit includes a ring laser generator (model: LRS-0808-660) and a CCD sensor (model: MV-EM120M); the robotic arm assembly is a six-axis robotic arm (model: IRB120).

[0031] Molding method: S1: Loading and positioning. The loading robotic arm acquires images of the sheet metal through the first vision unit, identifies the actual placement coordinates of the sheet metal as Pxa=25.12mm, Pya=18.05mm, and the theoretical placement coordinates as Pxt=25.00mm, Pyt=18.00mm. The loading and unloading positioning fine-tuning algorithm calculates ΔPx=25.00-25.12=-0.12mm and ΔPy=18.00-18.05=-0.05mm. The central control system controls the robotic arm to move 0.12mm along the negative X-axis and 0.05mm along the negative Y-axis to complete the sheet metal placement. The pressure sensor monitors the contact pressure as F=52N (preset threshold F0=40N), which meets the positioning requirements. S2: Multi-station integrated processing, servo motor drives the rotary table to rotate, and the sheet material enters the forming station (forming pressure 120T) and the trimming-flanging station (trimming gap 0.1mm) in sequence. During this period, the pressure sensor monitors the clamping pressure in real time and keeps it at F≥40N. The central control system does not trigger the clamping force adjustment command.

[0032] S3: Vision-assisted punching. A rotating worktable moves the workpiece to the punching station. A laser projection component projects a 20×20mm grid. A CCD sensor acquires images and transmits them to the central control system. The actual hole coordinates Xa=60.03mm, Ya=45.02mm and the theoretical hole coordinates Xt=60.00mm, Yt=45.00mm are extracted. The punching positioning deviation compensation algorithm calculates ΔX=60.00-60.03=-0.03mm and ΔY=45.00-45.02=-0.02mm. The central control system drives the servo punching mechanism to complete X / Y axial compensation. The punching diameter is φ8mm and the position accuracy is ±0.02mm. S4: Unloading. The unloading robotic arm grabs the finished workpiece and transfers it to the finished product frame. The single processing cycle is 12 seconds.

[0033] Pressure stability verification algorithm: The formula used to monitor the stability of clamping pressure is: σ = Fmax - Fmin; Where: σ is the pressure fluctuation value (unit: N), Fmax is the maximum pressure value within the monitoring period (unit: N), and Fmin is the minimum pressure value within the monitoring period (unit: N); when σ ≤ 3N, the pressure is considered stable. In this embodiment, Fmax = 52.8N, Fmin = 51.5N, and σ = 1.3N ≤ 3N, so the positioning is considered stable. σ (Sigma) is the pressure fluctuation value, Fmax (Forcemaximum) is the maximum pressure value, and Fmin (Forceminimum) is the minimum pressure value. Example 3

[0034] according to Figure 1 , 2 As shown, this embodiment proposes an engine oil pan forming system and method, applied to the forming of curved surfaces of engine oil pans: System configuration: Same as in Example 2, except that the servo punching mechanism is equipped with an angle adjustment module (adjustment range 0-90°, angle accuracy ±0.1°), and the second vision unit is equipped with a surface contour extraction function.

[0035] Molding method: S1: Loading and positioning, consistent with Example 1, the plate is accurately placed by the loading and unloading positioning fine-tuning algorithm, and the pressure monitoring F=58N≥F0=40N. S2: Multi-station integrated processing, the rotating worktable drives the sheet material to complete the forming (curved surface forming pressure 150T), trimming-flanging process in sequence, pressure sensor monitors in real time, and positioning is stable. S3: Visual-assisted punching, laser projection component projects positioning grid, CCD sensor acquires image of curved workpiece, central control system calculates punching position curvature slope K=(y2-y1) / (x2-x1) through curved surface curvature slope extraction algorithm; Where (x1,y1)=(59.80mm,44.90mm) and (x2,y2)=(60.20mm,45.12mm), K=(45.12-44.90) / (60.20-59.80)=0.22 / 0.40=0.55; then, through the punching angle compensation algorithm θ=arctan(K), θ=arctan(0.55)≈28.8° is calculated, and the central control system controls the punching mechanism to adjust the angle to 28.8°; subsequently, through the punching positioning deviation compensation algorithm, ΔX=-0.04mm and ΔY=-0.03mm are calculated to complete the X / Y axial compensation. After punching, the hole axis is perpendicular to the curvature direction of the curved surface, and the position accuracy is ±0.02mm. S4: Unloading. The unloading robotic arm removes the finished curved oil pan, with a single processing cycle of 15 seconds. Algorithm for extracting surface curvature and slope: The formula is: K = (y2 - y1) / (x2 - x1); Where: K is the curvature slope of the punching position (dimensionless), x1 and x2 are the X coordinates (unit: mm) of two adjacent positioning grid points near the punching position, and y1 and y2 are the Y coordinates (unit: mm) of the corresponding grid points; the curvature slope is calculated by extracting the grid point coordinates, providing a basis for adjusting the punching angle. K (Curvature slope) is the curvature slope, x1 and x2 (x-coordinate1 / 2) are the X coordinates of the grid points, and y1 and y2 (y-coordinate1 / 2) are the Y coordinates of the grid points.

[0036] This invention, through an integrated design of a rotary worktable and a unified reference, enables the completion of all machining processes in a single workpiece clamping. This completely avoids the accumulation of positioning deviations caused by repeated clamping in traditional step-by-step machining. The pressure sensing component is linked with the central control system to adjust the clamping force in real time, ensuring stable workpiece positioning at each stage and keeping the overall product dimensional tolerance within a high-precision range. This solves the core problem of insufficient dimensional accuracy in traditional machining. Furthermore, this invention integrates a vision positioning component and a servo punching mechanism at the punching station. Through laser positioning grids and deviation compensation algorithms, it achieves precise hole position compensation. For curved oil pans, it can automatically adjust the punching angle to ensure the hole axis is perpendicular to the curvature direction. The punching position accuracy is significantly improved compared to traditional mechanical positioning, breaking through the technical bottleneck of precision punching of complex curved workpieces. Simultaneously, this invention, through the coordinated linkage of the robotic arm component with vision positioning and pressure sensing, achieves precise positioning and fine-tuning of sheet metal loading, ensuring consistency of the machining reference from the source. The fully automated design replaces manual intervention, significantly improving production efficiency, reducing labor costs and operational errors, and is suitable for the stable mass production of engine oil pans.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engine oil pan forming system, comprising a rotary table, a unified reference positioning mechanism, a pressure sensing component, a central control system, a vision positioning component, and a robotic arm component, characterized in that: Multiple processing stations are arranged around the circumference of the rotary table, and the processing stations include at least a forming station, a trimming-flanging station, and a punching station; the unified reference positioning mechanism includes a positioning reference block set at each processing station, each positioning reference block adopts the same reference surface design and is rigidly connected to the rotary table; the pressure sensing component is configured at each processing station for real-time monitoring of workpiece clamping pressure. The central control system is connected to the pressure sensing component and is used to adjust the clamping force of the positioning reference block according to the pressure monitoring data; the vision positioning component includes a first vision unit and a second vision unit, the first vision unit is used for plate feeding positioning, and the second vision unit is used for punching positioning; the robotic arm component is linked with the first vision unit and the central control system and is used for plate feeding and finished workpiece unloading.

2. The engine oil pan forming system according to claim 1, characterized in that: The second vision unit includes a laser projection component and an image acquisition component. The laser projection component is used to project a positioning grid onto the surface of the workpiece, and the image acquisition component is used to acquire images of the positioning grid and transmit them to the central control system.

3. The engine oil pan forming system according to claim 1, characterized in that: The punching station is equipped with a servo punching mechanism, which is connected to the central control system to achieve X / Y axis compensation and punching angle adjustment.

4. The engine oil pan forming system according to claim 1, characterized in that: The rotary table is equipped with a servo drive component to drive the rotary table to rotate precisely with a rotation accuracy of ≤ ±0.01mm.

5. The engine oil pan forming system according to claim 1, characterized in that: The robotic arm assembly includes a loading robotic arm and a unloading robotic arm, which operate independently and are each equipped with a flexible gripping mechanism.

6. A method for forming an engine oil pan, using an engine oil pan forming system according to any one of claims 1-5, characterized in that, Includes the following steps: S1: Loading and positioning. The robotic arm component identifies the position of the sheet metal through the first vision unit, grabs the sheet metal and places it on the positioning reference block of the forming station. The pressure sensing component monitors the contact pressure, and the central control system fine-tunes the position of the sheet metal according to the pressure data to complete the positioning. S2: Multi-station integrated processing, the rotary table drives the workpiece to rotate sequentially to the forming station, trimming-flanging station and punching station. Each station is positioned by a unified reference positioning mechanism. The central control system adjusts the clamping force according to the real-time data of the pressure sensing components to position the workpiece. S3: Vision-assisted punching. The second vision unit acquires the workpiece image and calculates the hole position deviation. The central control system drives the punching mechanism to perform position compensation and complete the punching. S4: Unloading. The robotic arm assembly removes the processed workpiece, completing the entire processing step.

7. The method for forming an engine oil pan according to claim 6, characterized in that: In step S1, the fine-tuning of the sheet position is achieved through a loading / unloading positioning fine-tuning algorithm, the formula of which is: ΔPx = Pxt - Pxa, ΔPy = Pyt - Pya, Where: ΔPx is the fine adjustment amount in the X-axis direction, in mm; ΔPy is the fine adjustment amount in the Y-axis direction, in mm; Pxt is the theoretical X-coordinate of the sheet material, in mm; Pxa is the actual X-coordinate of the sheet material, in mm; Pyt is the theoretical Y-coordinate of the sheet material, in mm; Pya is the actual Y-coordinate of the sheet material, in mm.

8. The method for forming an engine oil pan according to claim 6, characterized in that: In S2, the preset threshold for the clamping force adjustment is F0. When the monitored pressure F < F0, the central control system controls the positioning reference block to increase the clamping force until F ≥ F0. The value of F0 is 30-80N.

9. The method for forming an engine oil pan according to claim 6, characterized in that: In step S3, the hole position deviation is calculated using a punching positioning deviation compensation algorithm. The algorithm formula is as follows: ΔX = Xt - Xa, ΔY = Yt - Ya, Where: ΔX is the deviation value in the X-axis direction, in mm; ΔY is the deviation value in the Y-axis direction, in mm; Xt is the theoretical X coordinate of the hole position, in mm; Xa is the actual X coordinate of the hole position, in mm; Yt is the theoretical Y coordinate of the hole position, in mm; Ya is the actual Y coordinate of the hole position, in mm.

10. The method for forming an engine oil pan according to claim 6, characterized in that: The S3 also includes adaptive adjustment of the punching angle: the second vision unit collects the curved surface contour data of the punching area of ​​the workpiece, the central control system calls the curved surface curvature angle compensation algorithm, calculates the punching angle compensation value based on the curved surface contour data of the engine oil pan, and then drives the servo punching mechanism to adjust the punching direction so that the punching axis is consistent with the curvature normal direction of the punching position of the curved surface.

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