Joint control method of process quality of end cap flanging machine

Abstract

The process quality joint control method of the end cap flanging machine of the present invention includes the steps of initializing the end cap flanging machine, parameter setting, installing the workpiece to be flanging, flanging operation, sample unloading, quality inspection, data analysis and optimization. The end cap flanging machine includes a support frame, a die pressing mechanism, a flanging mechanism and a control mechanism. The die pressing mechanism clamps the workpiece to be flanging and rotates at high speed. The flanging wheel in the flanging mechanism performs flanging processing on the workpiece to be flanged under the drive of a motor. At the same time, the relationship between the weak point thickness proportion n and the processing strain rate ε and the operating parameters and the size parameters of the workpiece to be flanging is introduced, and the operating parameters are flexibly optimized according to the processing requirements to ensure the stability and predictability of the flanging process, and significantly reduce the material thickness thinning phenomenon caused by inappropriate processing conditions during the production process.

Description

Technical Field

[0001] The invention relates to the technical field of flanging, and in particular to a process quality joint control method for an end cap flanging machine. Background Art

[0002] Outer edge flanging technology is an important process in metal processing for improving the edge strength and rigidity of the plate. By bending the edge of the plate into a certain angle, it can not only enhance the appearance of the plate, but also provide better support and sealing performance during assembly. Traditional outer edge flanging technology usually uses a single mold and mechanical equipment. This fixed mode requires frequent mold replacement or equipment adjustment when processing flanging parts of different sizes or shapes, which greatly reduces production efficiency. Secondly, each time the mold is replaced or the parameters are adjusted, trial production needs to be carried out again to ensure the quality of the flanging, which further increases production costs and time consumption. In addition, the operating parameters of existing flanging technologies often rely on the operator's experience and lack precise basis. Not only is it difficult to ensure the stability of the flanging quality, but when the operator is inexperienced or the material properties change, it is easy to cause defects such as wrinkling, thickness thinning or cracking of the material during the flanging process, thereby affecting the product's qualification rate. Usually, only when significant quality problems appear in batch-processed workpieces will the manual sampling process be triggered or the technical team will be prompted to re-evaluate and adjust the process parameters. This passive quality control mode lacks effective online monitoring methods, and initial abnormalities or subtle fluctuations on the production line are difficult to be captured and corrected in time, resulting in problems gradually accumulating in batch production, ultimately affecting the stability and reliability of the overall flanging process. Summary of the invention

[0003] In view of the deficiencies mentioned in the above technical background, an object of the present invention is to provide a process quality joint control method for an end cap flanging machine.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] The process quality joint control method of the end cap flanging machine includes the following steps:

[0006] S1. Initialize the end cap flanging machine: Run the end cap flanging machine empty, and check whether the directions of each moving part are correct and whether the hydraulic parts are working normally;

[0007] The end cap flanging machine comprises a support frame, a die mechanism, a flanging mechanism and a control mechanism, the support frame is equipped with a non-contact thickness detector for detecting the wall thickness of the end cap, the top of the support frame is fixedly equipped with the hydraulic component for controlling the die mechanism to clamp and release the piece to be flanging; the die mechanism comprises an upper die and a lower die, the upper die and the lower die clamp the piece to be flanging and rotate at high speed; the flanging mechanism is fixedly mounted on the support frame and arranged at the outer edge of the die mechanism, the flanging mechanism comprises a flanging wheel and a motor, the motor drives the flanging wheel to move up and down and forward and backward, and the flanging wheel is inclined at a certain angle relative to the lower die; the control mechanism is used for automatic control of the end cap flanging machine;

[0008] S2, parameter setting: setting the operating parameters of the end cap flanging machine according to the size of the flanging piece and the process requirements, the operating parameters including the rotation speed v1 of the die mechanism, the rotation speed v2 of the flanging wheel, the feeding pitch v3 of the flanging wheel, and the inclination angle θ of the flanging wheel relative to the lower die;

[0009] The feed step v3 of the flanging wheel is the speed at which the flanging wheel moves downward.

[0010] The process requirements include that the thickness ratio n of the weak point of the flanged part should be greater than or equal to the threshold value n' and the processing strain rate ε of the flanged part should be greater than or equal to the critical strain rate ε', satisfying the following formula:

[0011] ε≥ε'

[0012]

[0013] n≥n'

[0014]

[0015] Among them, k1~k5, a, b, c are adjustment coefficients, t0 is the thickness of the piece to be flanging, d m is the flanging diameter of the piece to be flanging, and D is the diameter of the piece to be flanging;

[0016] In the flanging process, the thickness ratio n of the weak point of the part to be flanging refers to the ratio of the minimum wall thickness of the flanging part during the processing to the thickness of the original material. This ratio can reflect the degree of deformation of the material during the flanging process and the possible stress concentration area. Generally, the weak point is due to the local thinning of the material under the action of tensile or compressive force, which leads to the decrease of the local strength of the material, making the material at these points a potential failure area. Therefore, controlling the thickness ratio n of the weak point is crucial to ensure the quality and reliability of the flanging part.

[0017] During the flanging process, the piece to be flanging is simultaneously subjected to radial tensile stress and tangential compressive stress, resulting in radial elongation deformation and tangential compression deformation. The deformation mainly occurs in the flanging part. As the diameter D of the piece to be flanging increases, the material thickness is significantly reduced. A large area of ​​the flanging part is in an unsupported state, so its load-bearing capacity is weak, and the plate is prone to wrinkling defects. Therefore, the diameter D of the piece to be flanging is inversely proportional to the thickness ratio n of the weak point of the piece to be flanging.

[0018] As the thickness t0 of the flanged piece increases, it means that the material can withstand greater plastic deformation without breaking during the flange process, and the thickness of the flanged part decreases at a smaller rate, so the thickness at the weak point accounts for a relatively higher proportion; secondly, as the flange diameter d of the flanged piece increases, m The increase in the flange diameter d means that the height of the flange portion is smaller, which reduces the defects caused by material accumulation or uneven deformation, such as wrinkling or cracking. Therefore, the flange diameter d of the flanged piece to be flanged is m , the thickness t0 of the piece to be flanging is proportional to the thickness ratio n of the weak point of the piece to be flanging.

[0019] As the inclination angle θ of the flanging wheel relative to the lower die increases, the tensile effect of the flanging wheel on the part to be flanging becomes more obvious, and the material is subjected to greater tensile stress in the flanging area, resulting in thinner thickness. Therefore, the angle θ is inversely proportional to the thickness ratio n of the weak point of the part to be flanging.

[0020] The ratio of the rotation speed v1 of the die mechanism to the rotation speed v2 of the flanging wheel will affect the plastic deformation and thermal effect of the material during the flanging process, and further affect the thickness of the flanging part. If v1 is too high and v2 is too low, the material may be subjected to excessive tensile stress during the flanging process, thereby increasing the risk of cracks and reducing the wall thickness of the flanging part. On the contrary, if v2 is too high and v1 is too low, it may cause uneven deformation of the material during the flanging process, causing the material to become excessively thin in certain areas. Therefore, a suitable rotation speed ratio is very important to ensure the quality of the flanging.

[0021] However, in the actual manufacturing environment, the diameter D, thickness t0 and flange diameter d of the flanged part are mIt is usually determined according to the design requirements and is not easy to change; in particular, based on production experience and simulation analysis, the inclination angle θ between the flanging wheel and the lower die is set to 45°, which can ensure that the material is subjected to more uniform tension during the flanging process, and is a more suitable general angle; in addition, when the rotation speed v1 of the die mechanism and the rotation speed v2 of the flanging wheel maintain a ratio close to 1:1, the coordinated operation of the two reaches the best state, which can effectively avoid the phenomenon of excessive stretching or compression of the material caused by the speed difference. Therefore, under this series of given conditions, the core focus of the present invention is on the specific influence of the feed pitch v3 of the flanging wheel on the proportion n of the thickness of the weak point of the formed part. By finely adjusting v3, the degree of material deformation during the flanging process can be directly affected, thereby optimizing the proportion n of the thickness of the weak point.

[0022] The feed pitch v3 of the flanging wheel is a key indicator for controlling the quality of flanging forming. The simulation experiment results show that if the feed pitch v3 is too large, the movement amplitude of the flanging wheel will increase accordingly, causing the metal sheet to undergo severe plastic deformation in a short period of time, resulting in instability of the flanging part, causing obvious wrinkling on the metal surface, and seriously affecting the forming quality; on the contrary, when the feed pitch v3 is small, the flanging part of the end cover is relatively smooth, and no obvious forming defects occur. This is because when the feed pitch v3 is small, the movement amplitude of the flanging wheel is moderate, the metal sheet is not prone to severe plastic deformation, and the workpiece forming quality is better.

[0023] However, if the feed pitch v3 of the flanging wheel is too small, it is easy to cause work hardening of the metal material, affecting the subsequent forming, and the processing time will also be greatly increased. Therefore, it is necessary to introduce the processing strain rate ε to control the minimum limit of the feed pitch v3 of the flanging wheel, so as to avoid work hardening and unnecessary extension of processing time while ensuring the forming quality.

[0024] S3, installing the piece to be flanging: placing the axis of the piece to be flanging aligned with the axis of the lower die, and controlling the die mechanism through the hydraulic component to press the piece to be flanging;

[0025] S4, flanging operation: start the end cap flanging machine, the control mechanism controls the die mechanism to rotate at a preset speed v1, the motor drives the flanging wheel to move forward toward the axis of the workpiece to be flanged, until the flanging wheel and the outer edge of the upper die are tangent to complete the positioning of the flanging wheel; according to the progressive forming process, the motor drives the flanging wheel to move downward at a preset feed step v3 to flanging the workpiece to be flanged into an end cap;

[0026] S5, sample unloading: after the flanging process is completed, the control mechanism stops the die pressing mechanism and the flanging mechanism, and guides the die pressing mechanism and the flanging wheel to return to their original positions, unloading the end cap, and repeating the above steps S2 to S4;

[0027] S6. Quality inspection: The non-contact thickness detector automatically detects the wall thickness of the end cap and collects data, and performs manual intervention in a timely manner when an abnormal situation occurs;

[0028] S7, data analysis and optimization: perform numerical analysis on the collected data and establish a flanging model, and optimize the adjustment coefficients in step S2 and the operating parameters according to the model.

[0029] Furthermore, the diameter D of the piece to be flanged in step S2 is determined by the flange diameter d m and the thickness t0 of the flanged piece to be flanged, satisfying the following formula:

[0030] D≤D max =γ1·d m +γ2·t0

[0031] Among them, γ1 and γ2 are control factors, D max is the critical diameter of the piece to be flanging.

[0032] Through several groups of physical processing test data, it can be concluded that when the diameter D of the flanged part is small, the flanged part is smooth and flat, the surface quality is good, and there is no obvious forming defect, which can be regarded as a qualified end cap workpiece; but when the diameter D of the flanged part is large, the flanged part has serious wrinkling and thickness reduction, which cannot meet the quality standard of the end cap; therefore, the present invention takes the maximum diameter of the flanged part of the end cap workpiece without serious thickness reduction as the critical diameter of the flanged part, that is, D max . According to the different d m The forming law under the conditions of t0 shows that as the flange diameter d m The increase in critical diameter D max Also increases, and the two change basically linearly; with the increase of the thickness t0 of the flanged piece, at the same flange diameter d m The critical diameter D max It also gradually increases, which shows that thicker sheets have better performance in the flanging process and are less likely to have forming defects such as wrinkles. Therefore, thicker sheets should be preferred for the production of end covers during the processing.

[0033] Furthermore, the installation of the part to be flanged in step S3 is assisted by a camera system and an image processing system. The camera system captures the image of the part to be flanged after installation and transmits it to the image processing system. The image processing system marks a number of points along the circumference of the part to be flanged, and determines its actual axial position through geometric calculation. The control mechanism generates a deviation report based on the deviation between the actual axial position and the axial position of the lower die for the operator to adjust.

[0034] In summary, the beneficial effects of the present invention are:

[0035] 1. The present invention adopts a layer-by-layer and point-by-point progressive forming process, which can accurately control the deformation of each area of ​​the metal sheet, make fuller use of the deformation properties of the material, make the wall thickness of the formed part more uniform, and improve the forming performance of the metal material. The biggest feature of the progressive forming process is that it has a small demand for molds and does not require complicated and tedious design and processing processes. The target parts can be designed and manufactured quickly, saving time and money.

[0036] 2. The die-pressing mechanism firmly clamps the flanged parts and drives them to rotate at high speed. Combined with the precise downward pressing action of the flanging wheel, the material is induced to undergo plastic deformation through gradual force application. The entire process completely abandons the traditional cutting process, retains the integrity of the raw materials to the greatest extent, and significantly improves the material utilization rate.

[0037] 3. The present invention establishes a relationship between the weak point thickness ratio n and the operating parameters and the size parameters of the part to be flanging according to the process requirements of the weak point thickness ratio n, which is helpful to directly monitor and control the flanging quality, flexibly optimize the operating parameters according to the processing requirements, ensure the stability and predictability of the flanging process, and significantly reduce the material thickness thinning phenomenon caused by inappropriate processing conditions during the production process, thereby improving the wall thickness uniformity and overall quality of the flanging parts. By introducing the control standard of the processing strain rate ε, the hardening of the material during the flanging process can be effectively avoided, which has important guiding significance for determining the lower limit of the flanging wheel feed distance v3. Comprehensive consideration of the weak point thickness ratio n and the processing strain rate ε makes the adjustment of the flanging process more scientific and accurate, ensuring that the flanging quality is fully optimized while meeting the strength and deformation requirements.

[0038] 4. By quantifying the flange diameter d of the flanged part m , thickness t0 is the critical diameter D of the flanged part max The influence of provides a scientific basis for the setting of process parameters, avoids blind experiments, and guides how to choose the appropriate material thickness t0 under a specific flange diameter dm; or how to choose the appropriate flange diameter d0 under a specific material thickness t0. m, to avoid wrinkling and thickness reduction problems during the flanging process, and ensure the surface quality and structural strength of the end cover workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a stereoscopic diagram of the end cap flanging machine of the present invention;

[0040] Figure 2 It is a structural schematic diagram of the flanging mechanism of the present invention;

[0041] Figure 3 It is a flow chart of the process quality joint control method of the end cap flanging machine of the present invention;

[0042] Figure 4 is a curve diagram of the weak point thickness ratio n and the feed distance v3 of the flanging wheel in this embodiment;

[0043] Figure 5 is the critical diameter D of the flanged part in this embodiment max With flange diameter d m Graph of

[0044] Figure 6 is a schematic diagram of the inclination angle θ between the flanging wheel and the lower die of the present invention;

[0045] Among them: 1-support frame, 11-hydraulic component, 2-die pressing mechanism, 21-upper die pressing, 22-lower die pressing, 3-flanging mechanism, 31-flanging wheel, 32-motor. DETAILED DESCRIPTION

[0046] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention, and cannot be used to limit the present invention.

[0047] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also have other implementations and variations thereof. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0048] like Figures 1 to 3 As shown, the process quality joint control method of the end cap flanging machine includes the following steps:

[0049] S1. Initialize the end cap flanging machine: Run the end cap flanging machine with an empty vehicle to check whether the directions of each moving part are correct and whether the hydraulic part 11 works normally;

[0050] The end cap flanging machine comprises a support frame 1, a die pressing mechanism 2, a flanging mechanism 3 and a control mechanism (not shown in the figure). A non-contact thickness detector (not shown in the figure) is installed on the support frame 1 for detecting the wall thickness of the end cap. A hydraulic component 11 is fixedly installed on the top of the support frame 1 for controlling the die pressing mechanism 2 to clamp and release the piece to be flanging; the die pressing mechanism 2 comprises an upper die 21 and a lower die 22, and the upper die 21 and the lower die 22 clamp the piece to be flanging and rotate at high speed; the flanging mechanism 3 is fixedly installed on the support frame 1 and arranged on the outer edge of the die pressing mechanism 2, and the flanging mechanism 3 comprises a flanging wheel 31 and a motor 32, and the motor 32 drives the flanging wheel 31 to move up and down and forward and backward, and the flanging wheel 31 is inclined at a certain angle relative to the lower die 22; the control mechanism is used for automatic control of the end cap flanging machine;

[0051] S2, parameter setting: setting the operating parameters of the end cap flanging machine according to the size of the flanging piece and the process requirements, the operating parameters including the rotation speed v1 of the die mechanism 2, the rotation speed v2 of the flanging wheel 31, the feeding pitch v3 of the flanging wheel 31, and the inclination angle θ of the flanging wheel 31 relative to the lower die 22;

[0052] The feeding pitch v3 of the flanging wheel 31 is the speed at which the flanging wheel 31 moves downward.

[0053] The process requirements include that the thickness ratio n of the weak point of the flanged part should be greater than or equal to the threshold value n' and the processing strain rate ε of the flanged part should be greater than or equal to the critical strain rate ε', satisfying the following formula:

[0054] ε≥ε'

[0055]

[0056] n≥n'

[0057]

[0058] Among them, k1~k5, a, b, c are adjustment coefficients, t0 is the thickness of the flanged part, d m is the flange diameter of the part to be flanged, and D is the diameter of the part to be flanged;

[0059] In this embodiment, a circular aluminum plate with a diameter D of 108 mm and a thickness t0 of 1.06 mm is to be flanged. mThe thickness of the flanging wheel 31 is 84 mm, and the proportion of the thickness of the weak point n is not less than 0.80. Based on production experience and simulation analysis, when the inclination angle θ between the flanging wheel 31 and the lower die 22 is set to 45° and the rotation speed v1 of the die mechanism 2 and the rotation speed v2 of the flanging wheel 31 are kept close to 1:1, the material is subjected to more uniform tension during the flanging process, the flanging quality is better and the processing difficulty is relatively small. Therefore, in this embodiment, the inclination angle θ of the flanging wheel 31 relative to the lower die 22 is 45°, and the rotation speed v1 of the die mechanism 2 and the rotation speed v2 of the flanging wheel 31 are both 5r / s, that is, their ratio is 1.

[0060] like Figure 4 As shown, by adjusting the feed pitch v3 of the flanging wheel 31 and collecting multiple sets of weak point thickness proportion n data for fitting regression analysis, it can be determined that the adjustment coefficients k1~k5 are 0.80, 50.76, 0.75, 0.6, and -4.09 respectively, and the adjustment coefficients a, b, and c are 0.51, 0.93, and 0.50 respectively, that is, the relationship between the weak point thickness proportion n and the feed pitch v3 of the flanging wheel 31 is as follows:

[0061]

[0062] n≥n'=0.80

[0063] Based on the design requirement, the weak point thickness ratio n is not less than 0.80, that is, the feed pitch v3 of the flanging wheel 31 should be less than or equal to 0.71mm / s. Since the feed pitch v3 of the flanging wheel 31 is too small, it is easy to cause work hardening of the metal material, affecting the subsequent forming, and the processing time will also increase significantly. Therefore, the processing strain rate ε is introduced to control the minimum limit of the feed pitch v3 of the flanging wheel 31. According to the stress-strain distribution of the outer curved plane flanging of the outer edge of the aluminum plate, it can be known that the critical strain rate ε' of the aluminum plate is 0.08, that is, when the processing strain rate ε is less than the critical strain rate ε', the metal material will undergo work hardening, making it more difficult to continue processing, and causing greater wear on the flanging wheel 31. In order to avoid this situation, it should be ensured that the feed pitch v3 of the flanging wheel 31 matches the critical strain rate ε' to maintain the efficiency and quality of the processing process, and satisfy the following relationship:

[0064] ε≥ε′=0.08

[0065]

[0066] v3≥0.2mm / s

[0067] In summary, combined with the flanging quality requirements of the weak point thickness ratio n and the critical strain rate ε', it can be determined that when flanging a circular aluminum plate with a diameter D of 108 mm and a thickness t0 of 1.06 mm, the feed pitch v3 of the flanging wheel 31 should be between 0.2 mm / s and 0.7 mm / s, which can improve production efficiency and reduce equipment wear while ensuring the flanging quality.

[0068] S3, installing the piece to be flanging: aligning the axis of the piece to be flanging with the axis of the lower die 22, and controlling the die mechanism 2 through the hydraulic component 11 to press the piece to be flanging;

[0069] S4, flanging operation: start the end cap flanging machine, the control mechanism controls the die mechanism 2 to rotate at a preset speed v1, the motor 32 drives the flanging wheel 31 to move toward the axis of the workpiece to be flanged, until the flanging wheel 31 and the outer edge of the upper die 21 are externally tangent, and the positioning of the flanging wheel 31 is completed; according to the progressive forming process, the motor 32 drives the flanging wheel 31 to move downward according to the preset feed step v3, and the workpiece to be flanged is flanging-processed into an end cap;

[0070] S5, sample unloading: after the flanging process is completed, the control mechanism stops the die pressing mechanism 2 and the flanging mechanism 3, and guides the die pressing mechanism 2 and the flanging wheel 31 to return to the original position, unloading the end cap, and repeating the above steps S2 to S4;

[0071] S6. Quality inspection: The non-contact thickness detector automatically detects the wall thickness of the end cap and collects data. When abnormal conditions occur, manual intervention is carried out in a timely manner;

[0072] S7, data analysis and optimization: perform numerical analysis on the collected data and establish a flanging model, and optimize the adjustment coefficients and operating parameters in step S2 according to the model.

[0073] Collect a large amount of data and verify the formula in step S2, continuously adjust, optimize and iterate according to new data and production feedback, determine the optimal values ​​of adjustment coefficients and operating parameters, establish a more accurate flanging model, and improve the flanging quality of the end cap.

[0074] The progressive forming process is to decompose the geometric workpiece with a complex three-dimensional shape into a series of two-dimensional layers at a certain distance in the Z-axis direction. The flanging wheel 31 only needs to contact a part of the area of ​​the workpiece to be flanging under the control of the motor 32. The flanging wheel 31 starts from the highest point and processes layer by layer according to a pre-set processing trajectory. After each layer is processed, the flanging wheel 31 enters the next layer to continue forming the workpiece to be flanging. After repeated many times, the entire flanging process is completed, which greatly improves the plastic deformation capacity of the plate and increases the forming limit of the workpiece to be flanging.

[0075] Furthermore, the diameter D of the flanged piece in step S2 is determined by the flange diameter d m and the thickness t0 of the flanged piece to be flanged, satisfying the following formula:

[0076] D≤D max =γ1·d m +γ2·t0

[0077] Among them, γ1 and γ2 are control factors, D max is the critical diameter of the part to be flanging.

[0078] like Figure 5 As shown, in this embodiment, the plate to be flanged is a circular aluminum plate with a diameter of 108 mm and a thickness of 1.06 mm. m end cap, and obtain the critical diameter D of several groups of flanged parts max By fitting and regression analysis of the data, it can be determined that the control factors γ1 and γ2 are 0.94 and 30.04 respectively, so the critical diameter D of the flanged part max With flange diameter d m The relationship is as follows:

[0079] D≤D max =0.94d m +30.04t0

[0080] According to the specific process requirements of this case, the target flange diameter d m Set to 84mm, according to the above relationship, the critical diameter D of the flanged part can be obtained max It is 110.8mm, that is, to ensure that there is no serious thickness reduction during the flanging process, the diameter of the part to be flanging should be less than or equal to 110.8mm.

[0081] Furthermore, in step S3, the installation of the part to be flanged is assisted by a camera system and an image processing system. The camera system captures the image of the part to be flanged after installation and transmits it to the image processing system. The image processing system marks several points along the circumference of the part to be flanged, and determines its actual axial position through geometric calculation. The control mechanism generates a deviation report based on the deviation between the actual axial position and the axial position of the lower die 22 for the operator to adjust.

[0082] The axis position is determined by image processing system identification and geometric calculation, which effectively avoids visual errors during manual alignment, significantly improves the alignment accuracy of the flanged parts and the mold, reduces dependence on operator skills, and improves production efficiency.

[0083] It should be understood that the above-mentioned embodiments are one or more embodiments of the present invention. There are many other embodiments and variations thereof based on the present invention. For example, the inclination angle θ of the flanging wheel relative to the lower die can be flexibly adjusted according to specific application requirements and expected flanging effects, and different angles such as 30° and 60° can be selected to achieve optimal processing quality and production efficiency. The variations and modifications made by ordinary technicians in this industry through the present invention without making pioneering innovations are all within the scope of protection of the present invention.

Claims

1. The process quality joint control method of the end cap flanging machine is characterized by The following steps are involved: S1. Initialize the end cap flanging machine: Run the end cap flanging machine empty, and check whether the directions of each moving part are correct and whether the hydraulic parts are working normally; The end cap flanging machine comprises a support frame, a die mechanism, a flanging mechanism and a control mechanism, the support frame is equipped with a non-contact thickness detector for detecting the wall thickness of the end cap, the top of the support frame is fixedly equipped with the hydraulic component for controlling the die mechanism to clamp and release the piece to be flanging; the die mechanism comprises an upper die and a lower die, the upper die and the lower die clamp the piece to be flanging and rotate at high speed; the flanging mechanism is fixedly mounted on the support frame and arranged at the outer edge of the die mechanism, the flanging mechanism comprises a flanging wheel and a motor, the motor drives the flanging wheel to move up and down and forward and backward, and the flanging wheel is inclined at a certain angle relative to the lower die; the control mechanism is used for automatic control of the end cap flanging machine; S2, parameter setting: setting the operating parameters of the end cap flanging machine according to the size of the workpiece to be flanging and the process requirements, the operating parameters including the rotation speed v1 of the die mechanism, the rotation speed v2 of the flanging wheel, the feed pitch v3 of the flanging wheel, and the angle θ at which the flanging wheel is inclined relative to the lower die, wherein the feed pitch v3 of the flanging wheel is the speed at which the flanging wheel moves downward; The process requirements include that the thickness ratio n of the weak point of the flanged part should be greater than or equal to the threshold value n' and the processing strain rate ε of the flanged part should be greater than or equal to the critical strain rate ε', satisfying the following formula: Among them, k1~k5, a, b, c are adjustment coefficients, t0 is the thickness of the piece to be flanging, d m is the flanging diameter of the piece to be flanging, and D is the diameter of the piece to be flanging; S3, installing the piece to be flanging: placing the axis of the piece to be flanging aligned with the axis of the lower die, and controlling the die mechanism through the hydraulic component to press the piece to be flanging; S4, flanging operation: start the end cap flanging machine, the control mechanism controls the die mechanism to rotate at a preset speed v1, the motor drives the flanging wheel to move forward toward the axis of the workpiece to be flanged, until the flanging wheel and the outer edge of the upper die are tangent to complete the positioning of the flanging wheel; according to the progressive forming process, the motor drives the flanging wheel to move downward at a preset feed step v3 to flanging the workpiece to be flanged into an end cap; S5, sample unloading: after the flanging process is completed, the control mechanism stops the die pressing mechanism and the flanging mechanism, and guides the die pressing mechanism and the flanging wheel to return to their original positions, unloading the end cap, and repeating the above steps S2 to S4; S6. Quality inspection: The non-contact thickness detector automatically detects the wall thickness of the end cap and collects data, and performs manual intervention in a timely manner when an abnormal situation occurs; S7, data analysis and optimization: perform numerical analysis on the collected data and establish a flanging model, and optimize the adjustment coefficients in step S2 and the operating parameters according to the model.

2. The process quality joint control method of the end cap flanging machine according to claim 1 is characterized in that: In step S2, the diameter D of the piece to be flanged is determined by the flange diameter d m and the thickness t0 of the flanged piece to be flanged, satisfying the following formula: Among them, γ1 and γ2 are control factors, D max is the critical diameter of the piece to be flanging.

3. The process quality joint control method of the end cap flanging machine according to claim 1 is characterized in that: The installation of the part to be flanged in step S3 is assisted by a camera system and an image processing system. The camera system captures the image of the part to be flanged after installation and transmits it to the image processing system. The image processing system marks a number of points along the circumference of the part to be flanged, and determines its actual axial position through geometric calculation. The control mechanism generates a deviation report based on the deviation between the actual axial position and the axial position of the lower die for the operator to adjust.

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