Anti-peeling method based on high-compactness exhaust die punching technology

Abstract

The invention relates to the technical field of mold anti-peeling, in particular to an anti-peeling method based on a high-compactness exhaust stamping die technology, which comprises the following steps: detecting the surface peeling state of a stamped mold, and judging whether to adjust an initial stamping value or not or whether to detect an exhaust port of the mold or not according to the surface peeling state; the initial stamping value adjusting mode is judged by detecting the peeling position of the die after stamping is completed; the exhaust volume in the die cavity in the stamping process and the volume of the stamping part after stamping are completed are obtained, a stamping gas volume comparison result is obtained, and whether the stamping speed is adjusted or not is judged according to the stamping gas volume comparison result; and according to the adjusted initial stamping value and the stamping speed, stamping contrast parameters are generated, and whether the stamping contrast parameters meet the stamping requirement or not is judged according to the surface peeling state. According to the method, the stamping part volume and the exhaust volume during stamping are detected, and the stamping contrast parameters are generated according to the initial stamping value and the stamping speed so as to prevent the stamping part from peeling.

Description

Technical Field

[0001] The invention relates to the technical field of mold anti-peeling, and in particular to an anti-peeling method based on high-density exhaust die technology. Background Art

[0002] In the field of metal stamping, especially in the processing of high-precision and high-strength materials, peeling is a common surface defect, which is manifested as the separation or peeling of the surface layer of the material from the matrix. Die casting is a metal casting process. This process is a high-speed, high-pressure production process. There are many factors that affect its production quality. If these factors cause the surface quality of the die casting to be poor, a thin layer of skin will easily rise or even fall off on the surface of the die casting after shot blasting. The peeled part can be easily picked off by hand, which will have a serious impact on product performance.

[0003] The Chinese patent application with publication number CN117505802A discloses a method for troubleshooting the cause of peeling on the surface of a die-casting after shot blasting, comprising: sequentially checking the current mold, die-casting equipment and process parameters. The method for troubleshooting the cause of peeling on the surface of a die-casting after shot blasting proposed by the present invention sequentially checks the current mold, die-casting equipment and process parameters to check whether there are influencing factors, thereby improving the efficiency of troubleshooting the cause of peeling on die-castings after shot blasting, thereby improving the efficiency of solving the problem, and timely eliminating the losses caused by the batch scrapping of die-castings.

[0004] It can be seen that the prior art has the following problems: during the mold production process, the volume of the stamped parts and the exhaust volume are not detected and compared during stamping, and the stamping control parameters are generated based on the initial stamping value and the stamping speed to determine the peeling state, resulting in peeling on the surface of the stamped parts. Summary of the invention

[0005] To this end, the present invention provides an anti-peeling method based on high-density exhaust die technology, which is used to overcome the problem of peeling on the surface of the stamped parts in the prior art due to the fact that during the mold production process, the volume of the stamped parts and the exhaust volume are not detected and compared during stamping, and the stamping control parameters are generated according to the initial stamping value and the stamping speed to determine the peeling state.

[0006] To achieve the above object, the present invention provides an anti-skinning method based on high-density exhaust die technology, comprising the following steps: Based on the initial punching value, the punching die is punched, and the peeling state of the die surface after the punching is completed is detected by a peeling detection device, and it is determined whether to adjust the initial punching value or whether to detect the density of the die exhaust port according to the surface peeling state; In the case where the initial stamping value needs to be adjusted, the peeling position of the die after stamping is detected to determine whether to adjust the initial stamping value; For the case where the tightness of the mold exhaust port needs to be detected, obtain the exhaust gas volume in the mold cavity during the stamping process and the volume of the stamped part after stamping is completed, compare the exhaust gas volume and the volume of the stamped part, obtain the stamping gas volume comparison result, and determine whether to adjust the stamping speed according to the stamping gas volume comparison result; Determine whether the stamped part meets the stamping requirements according to the surface peeling state Further, the process of detecting the surface peeling state of the mold after stamping by the peeling detection device includes, Obtain the surface peeling state reflection parameters by detecting the surface undulation angle and the missing area of the stamped part through a scanning device, compare the surface peeling state reflection parameters with the standard peeling state reflection parameter range, and determine the surface peeling state of the stamped part according to the comparison result of the peeling state reflection parameters; Among them, the surface peeling state includes a flaky peeling state, a fish scale-like peeling state, and a non-peeling state.

[0007] Further, the process of obtaining the surface peeling state reflection parameters by detecting the surface undulation angle and the missing area of the stamped part through a scanning device includes, Determine the category of the actual undulation angle detected according to the preset standard undulation range, determine the evaluation value of the influence of the missing area on the surface peeling state reflection parameters according to the missing area ratio, and determine the peeling state reflection parameters according to the actual undulation angle and the missing area; Among them, the missing area ratio is the ratio of the actual missing area to the surface area of the stamped part.

[0008] Further, specifically, the process of determining the surface peeling state of the stamped part according to the comparison result of the peeling state reflection parameters includes, For the case where the comparison result of the peeling state reflection parameters is that the surface peeling state reflection parameter is greater than the maximum value of the standard peeling state reflection parameter range, determine that the surface peeling state is a flaky peeling state; For the case where the comparison result of the peeling state reflection parameters is that the surface peeling state reflection parameter is within the standard peeling state reflection parameter range, determine that the surface peeling state is a fish scale-like peeling state; For the case where the comparison result of the peeling state reflection parameters is that the surface peeling state reflection parameter is less than or equal to the minimum value of the standard peeling state reflection parameter range, determine that the surface peeling state is a non-peeling state.

[0009] Further, the process of determining whether to adjust the initial stamping value or whether to detect the tightness of the mold exhaust port through the surface peeling state includes, For the case where the surface peeling state is a flaky peeling state, determine to adjust the initial stamping value, and for the case where the surface peeling state is a fish scale-like peeling state, determine to detect the tightness of the mold exhaust port.

[0010] Furthermore, the process of determining whether to adjust the initial stamping value by detecting the peeling position of the die after stamping completion includes detecting the actual curvature of the stamped part at the peeling position, comparing the actual curvature of the stamped part with the standard curvature of the stamped part to obtain a curvature comparison result of the stamped part, and determining to adopt single stamping adjustment or compensation stamping adjustment according to the curvature comparison result of the stamped part.

[0011] Furthermore, the process of determining to adopt single stamping adjustment or compensation stamping adjustment according to the curvature comparison result of the stamped part includes For the case where the actual curvature of the stamped part is greater than the standard curvature of the stamped part, adjust the initial stamping value by adopting the compensation stamping method; For the case where the actual curvature of the stamped part is less than or equal to the standard curvature of the stamped part, adjust the initial stamping value by adopting the single stamping method; Among them, the single stamping method is to adjust the overall stamping value; the compensation stamping method is to locally adjust the stamping value according to the position where the actual curvature of the stamped part exceeds the standard.

[0012] Furthermore, the process of determining whether to adjust the stamping speed according to the comparison result of the stamping gas volume includes For the case where the comparison result of the stamping gas volume is that the volume of the stamped part is greater than the maximum value of the exhaust fluctuation volume, reduce the stamping speed according to the difference between the volume of the stamped part and the exhaust volume; For the case where the comparison result of the stamping gas volume is that the volume of the stamped part is less than the minimum value of the exhaust fluctuation volume, increase the stamping speed according to the difference between the exhaust volume and the volume of the stamped part; For the case where the comparison result of the stamping gas volume is that the volume of the stamped part is within the exhaust volume fluctuation range, maintain the original stamping speed.

[0013] Furthermore, the process of adjusting the initial stamping value by adopting the compensation stamping method includes If, after adjusting by adopting the compensation stamping method, the surface peeling state reflection parameter is re-detected, and for the case where the re-detected surface peeling state reflection is greater than the set maximum peeling state reflection parameter, determine that the corresponding stamped part is a defective product.

[0014] Furthermore, the process of determining whether the stamped part meets the stamping requirements according to the surface peeling state includes Perform stamping again according to the adjusted stamping value and stamping speed, and determine the surface peeling state of the stamped part after stamping completion to ensure that the stamped part meets the stamping requirements.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows. By establishing a complete closed-loop control system for the stamping process, the present technical solution realizes the precise prevention and dynamic elimination of the surface peeling defects of stamped parts. The high-precision 3D scanning technology is used to accurately detect the surface defects of stamped parts. Through parametric analysis and differentiation, sheet-like peeling indicates excessive punching pressure, and fish-scale-like peeling reflects poor exhaust. The overall global pressure is adjusted with linear compensation, and the local compensation area is accurately pressure-regulated. By deeply integrating the principles of material mechanics and fluid mechanics with intelligent control technology, the present solution establishes a scientific and perfect digital twin optimization system for the stamping process, which has outstanding advantages such as faster response, higher precision, and stronger adaptability compared with traditional methods, providing a new generation of solutions for precision stamping manufacturing.

[0016] Furthermore, through high-precision 3D laser scanning and quantitative analysis, the present technical solution realizes the accurate detection and classification of the surface peeling defects of stamped parts, mainly bringing the following significant advantages. Using a 3D laser scanner, the surface undulations and missing quantitative indicators (undulation angle and missing area ratio) at the microscopic scale can be accurately captured, which is more objective and accurate than traditional visual inspection. Sheet-like peeling indicates excessive punching pressure. If the surface peeling state reflection parameter is greater than the maximum value of the standard surface peeling state reflection parameter interval, it is determined that the surface peeling state is a sheet-like peeling state. An excessively high surface peeling state reflection parameter can reflect an excessively large undulation angle or an excessive missing area, and either situation may result in large-area peeling or excessive peeling on the surface of the stamped part after stamping. This situation is set as the sheet-like peeling state, and the pressure parameters need to be adjusted. Fish-scale-like peeling reflects exhaust problems. If the surface peeling state reflection parameter is within the standard surface peeling state reflection parameter interval, it is determined that the surface peeling state is a fish-scale-like peeling state. The surface peeling state reflection parameter within the standard surface peeling state reflection parameter interval can reflect that either the undulation angle or the missing area exceeds the standard, or both the undulation angle and the missing area are at intermediate values, and the surface of the stamped part shows a continuous peeling state. This situation is set as the fish-scale-like peeling state, and the mold exhaust system needs to be checked. The state of no peeling verifies the process stability. A unified quantitative standard replaces subjective judgment. Historical data is traceable, facilitating quality analysis. It provides benchmark data for the development of new molds.

[0017] Furthermore, this technical solution addresses sheet peeling (material peeling defect): By reducing the punching pressure (e.g., from 1200 kN to 950 kN), the shear stress is directly reduced to effectively inhibit the material delamination phenomenon. If the curvature of the actual punched part is greater than that of the standard punched part, the increased initial punching value is determined according to the difference between the curvature of the punched part and the curvature of the standard punched part and the influence compensation parameter of the difference between the curvature of the punched part and the curvature of the standard punched part on the initial punching value. At this time, since the curvature of the punched part at the peeling position is not obvious compared to its overall curvature, the overall initial punching value is adjusted downward to change the peeling phenomenon on the surface of the punched part. The pressure adjustment amount is accurately calculated through the curvature difference to avoid empirical trial and error. The gas flowability is improved through exhaust detection and speed adjustment. In the straight line area, single punching adjustment and overall pressure adjustment are adopted. If the curvature of the actual punched part is less than or equal to the curvature of the standard punched part, the initial punching value using the single punching method is increased according to the difference between the curvature of the punched part and the curvature of the standard punched part. At this time, since the curvature of the punched part at the peeling position is quite different from its overall curvature, using the compensation punching method may cause damage to the whole punched part. Therefore, the initial punching value corresponding to the peeling position is adjusted using the single punching method. In the bending area, compensation punching is adopted for local precise pressure regulation. The adjustment parameters are linearly correlated with the curvature difference to achieve quantitative control. When the curvature is insufficient, pressure is increased for compensation; when the curvature is excessive, pressure is reduced for correction. The pressure adjustment amplitude is proportional to the curvature deviation to ensure the correction accuracy.

[0018] Furthermore, by establishing a dynamic coupling relationship among gas volume, stamping speed, and pressure parameters, the present technical solution realizes the closed-loop optimization control of the stamping process. It has a rapid response to excessive exhaust, a rapid response to excessive exhaust, and a multi-parameter collaborative control mechanism. It can effectively determine whether the surface peeling state meets the stamping requirements. If the comparison result of the stamping gas volume shows that the volume of the stamped part is greater than the maximum value of the exhaust fluctuation volume, the reduced stamping speed is determined according to the product of the difference between the volume of the stamped part and the maximum value of the exhaust fluctuation volume and the influence compensation parameter of the initial stamping speed. Among them, the stamping speed is negatively correlated with the difference between the volume of the stamped part and the maximum value of the exhaust fluctuation volume, and the negative correlation ratio between the stamping speed and the difference between the volume of the stamped part and the maximum value of the exhaust fluctuation volume is determined according to the preset negative correlation ratio, which can extend the gas discharge time and avoid pores or surface peeling caused by residual compressed gas in the material. If the comparison result of the stamping gas volume shows that the volume of the stamped part is less than the minimum value of the exhaust fluctuation volume, the increased stamping speed is determined according to the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part and the influence compensation parameter of the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part on the initial stamping speed. Among them, the stamping speed is positively correlated with the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part, and the positive correlation ratio between the stamping speed and the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part is determined according to the preset positive correlation ratio, which can reduce the ineffective exhaust time, reduce the risk of impurity inhalation, and improve production efficiency. Automatically match the adjustment range through material characteristics (such as aluminum alloy or high-strength steel) and die state to avoid manual trial and error. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flowchart of the anti-peeling method based on the high-density exhaust die technology in this embodiment; Figure 2 It is a flowchart of the process of determining the surface peeling state in the anti-peeling method based on the high-density exhaust die technology in this embodiment; Figure 3 It is a flowchart of the process of determining the adjustment method of the initial stamping value in the anti-peeling method based on the high-density exhaust die technology in this embodiment; Figure 4 It is a flowchart of the process of adjusting the stamping speed in the anti-peeling method based on the high-density exhaust die technology in this embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0022] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0023] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Please refer to Figures 1 - 4 as shown in Figure 1 the flowchart of the anti-peeling method based on the high-density exhaust die technology in this embodiment; Figure 2 the flowchart of the process of determining the surface peeling state in the anti-peeling method based on the high-density exhaust die technology in this embodiment; Figure 3 the flowchart of the process of determining the adjustment method of the initial stamping value in the anti-peeling method based on the high-density exhaust die technology in this embodiment; Figure 4 the flowchart of the process of adjusting the stamping speed in the anti-peeling method based on the high-density exhaust die technology in this embodiment.

[0025] This embodiment provides an anti-peeling method based on the high-density exhaust die technology, including the following steps Step S1: Stamp the die to be stamped based on the initial stamping value, detect the surface peeling state of the die after stamping through a peeling detection device, and determine whether to adjust the initial stamping value or whether to detect the density of the exhaust port of the die through the surface peeling state; Step S2: For the case where the initial stamping value needs to be adjusted, determine whether to adjust the initial stamping value by detecting the peeling position of the die after stamping; Step S3, for the case where the tightness of the mold exhaust port needs to be detected, obtain the exhaust gas volume in the mold cavity during the stamping process and the volume of the stamped part after stamping is completed. Compare the exhaust gas volume and the volume of the stamped part to obtain the stamping gas volume comparison result, and determine whether to adjust the stamping speed according to the stamping gas volume comparison result; Step S4, determine whether the stamped part meets the stamping requirements according to the surface peeling state.

[0026] This technical solution realizes the precise prevention and dynamic elimination of surface peeling defects of stamped parts by establishing a complete stamping process closed-loop control system. It uses high-precision 3D scanning technology to accurately detect surface defects of stamped parts. Through parametric analysis and differentiation, sheet-like peeling indicates excessive stamping pressure, and fish-scale-like peeling reflects poor exhaust. Overall, it adjusts the global pressure linear compensation, and precisely adjusts the pressure in the local compensation area. By deeply integrating the principles of material mechanics, fluid mechanics and intelligent control technology, this solution establishes a scientific and perfect digital twin optimization system for stamping processes, and has outstanding advantages such as faster response, higher precision and stronger adaptability compared with traditional methods, providing a new generation of solutions for precision stamping manufacturing.

[0027] Specifically, the process of detecting the surface peeling state of the mold after stamping by the peeling detection device includes, Detect the surface undulation angle and missing area of the stamped part through the scanning device to obtain the surface peeling state reflection parameters. Compare the surface peeling state reflection parameters with the standard peeling state reflection parameter interval, and determine the surface peeling state of the stamped part according to the peeling state reflection parameter comparison result; Among them, the surface peeling state includes sheet-like peeling state, fish-scale-like peeling state and non-peeling state.

[0028] The sheet-like peeling state is that the contact surface between the to-be-stamped part and the stamping mold presents a discontinuous peeling state; the fish-scale-like peeling state is that the contact surface between the to-be-stamped part and the stamping mold presents a continuous fish-scale-like peeling state; the non-peeling state is that the contact surface between the to-be-stamped part and the stamping mold has not changed and there is no peeling situation.

[0029] The curvature of the stamped part refers to the arc formed by the sheet material after bending deformation during the stamping process.

[0030] In this embodiment, a high-precision 3D laser scanner is used, which can accurately detect the microscopic undulations or missing areas on the surface of the stamped part. The undulation angle is the angle formed by the straight line from the edge point of the surface of the stamped part and the undulating surface to the starting point of the undulating surface, which can reflect the steepness of the peeling. The standard peeling state reflection parameter interval is determined according to the processing standard of the stamped part. Among them, the processing standard is such as the surface quality requirement of the stamped part (the material thickness tolerance needs to be controlled within ±0.05mm, and uneven thickness is likely to cause local stress concentration); Specifically, the process of obtaining the surface peeling state reflection parameter by detecting the surface undulation angle and missing area of the stamping part by the scanning device includes Judging the category of the actual undulation angle detected according to the preset standard undulation interval, determining the missing area influence evaluation value of the missing area on the surface peeling state reflection parameter according to the missing area ratio, and determining the peeling state reflection parameter according to the actual undulation angle and the missing area; Wherein, the missing area ratio is the ratio of the actual missing area to the surface area of the stamping part.

[0031] The surface peeling state reflection parameter is obtained by detecting the surface undulation angle and missing area of the stamping part by the scanning device. Among them, the peeling state reflection parameter can reflect the overall peeling amplitude of the stamping part and is a parameter for judging whether the peeling amplitude of the stamping part meets the processing conditions; the stamping part to be detected is placed on the scanning platform, and the 3D laser scanner is turned on to obtain the complete surface three-dimensional point cloud data of the stamping part.

[0032] A three-dimensional image of the stamping part is obtained according to the complete surface three-dimensional point cloud data of the stamping part. The related process is the prior art and will not be elaborated here. The surface of the stamping part in contact with the stamping die in the three-dimensional image is selected as the actual two-dimensional image of the stamping part, and the peeling analysis is carried out on the actual two-dimensional image, and the included angle between each measurement point and the reference plane is calculated. Among them, the reference plane is the plane without peeling in the stamping part, and the maximum value of the included angle is taken as the actual undulation angle. Such a value can ensure that the adjusted stamping value meets the stamping requirements.

[0033] By performing image recognition on the actual two-dimensional image, for example, the area without missing is gray and the missing area is black. The area of the missing area in the actual two-dimensional image is calculated by a computer, and the missing area ratio is obtained according to the ratio of the missing area to the surface area of the actual two-dimensional image. Determine the peeling state reflection parameter according to the sum of the product of the surface undulation angle of the stamping part and the undulation angle influence compensation parameter of the peeling state reflection parameter and the product of the missing area and the missing area influence compensation parameter of the peeling state reflection parameter. In this embodiment, the compensation parameter a for the influence of the undulation angle of the stamping part surface on the undulation angle of the parameter reflecting the peeling state is set; the compensation parameter b for the influence of the missing area on the parameter reflecting the peeling state is the missing area influence compensation parameter; among them, the compensation parameter for the influence of the undulation angle of the stamping part surface on the undulation angle of the parameter reflecting the peeling state is determined according to the historical data of the undulation angle of the stamping part surface. For example, the historical data shows that if the undulation angle of the stamping part is in the range of [0°, 4°), taking the compensation parameter for the influence of the undulation angle of the stamping part surface on the parameter reflecting the peeling state as 0.6 is beneficial to determining the surface peeling state; the historical data shows that if the undulation angle of the stamping part is in the range of [4°, 8°), taking the compensation parameter for the influence of the undulation angle of the stamping part surface on the parameter reflecting the peeling state as 0.7 is beneficial to determining the surface peeling state; if the undulation angle of the stamping part is in the range of [8°, 15°), taking the compensation parameter for the influence of the undulation angle of the stamping part surface on the parameter reflecting the peeling state as 0.8 is beneficial to determining the surface peeling state; if the undulation angle of the stamping part is greater than or equal to 15°, it is determined as a defective product.

[0034] The compensation parameter for the influence of the missing area on the parameter reflecting the peeling state is determined according to the missing area ratio. For example, if the missing area ratio is in the range of [0, 0.05), the compensation parameter for the influence of the missing area on the parameter reflecting the peeling state is taken as 0.2; if the missing area ratio is in the range of [0, 0.1), the compensation parameter for the influence of the missing area on the parameter reflecting the peeling state is taken as 0.3; if the missing area ratio is greater than or equal to 0.1, it is determined as a defective product; the above various influence compensation parameters can be dynamically adjusted according to the material type (such as aluminum alloy or high-strength steel).

[0035] Specifically, the process of determining the surface peeling state of the stamping part according to the comparison result of the parameter reflecting the peeling state includes For the case where the comparison result of the parameter reflecting the peeling state is that the parameter reflecting the surface peeling state is greater than the maximum value of the standard peeling state parameter interval, it is determined that the surface peeling state is a flaky peeling state; For the case where the comparison result of the parameter reflecting the peeling state is that the parameter reflecting the surface peeling state is within the standard peeling state parameter interval, it is determined that the surface peeling state is a fish-scale peeling state; For the case where the comparison result of the parameter reflecting the peeling state is that the parameter reflecting the surface peeling state is less than or equal to the minimum value of the standard peeling state parameter interval, it is determined that the surface peeling state is a non-peeling state.

[0036] The standard peeling state parameter interval is set as [5, 8], If the surface peeling state reflection parameter is greater than the maximum value of the standard peeling state reflection parameter range, it is determined that the surface peeling state is a flaky peeling state. A too high surface peeling state reflection parameter can reflect that the undulation angle is too large or the missing area exceeds the standard. Any of these situations may cause the surface of the stamped part to show large-area peeling or excessive peeling after stamping. This situation is set as the flaky peeling state; If the surface peeling state reflection parameter is within the standard peeling state reflection parameter range, it is determined that the surface peeling state is a scaly peeling state. The surface peeling state reflection parameter being within the standard peeling state reflection parameter range can reflect that either the undulation angle or the missing area exceeds the standard, or both the undulation angle and the missing area are at intermediate values, and the surface of the stamped part shows a continuous peeling state. This situation is set as the scaly peeling state; If the surface peeling state reflection parameter is less than the minimum value of the standard peeling state reflection parameter range, it is determined that the surface peeling state is a non-peeling state.

[0037] In this embodiment, the peeling determination is mainly performed on small stamped parts. The set two-dimensional image surface area of this stamped part is 100 mm 2 , for example, the undulation angle is 2°, and the corresponding undulation angle influence compensation parameter is 0.6; the missing area ratio is 0.02, then the missing area of the stamped part is 2 mm 2 , and the corresponding missing area influence compensation parameter is 0.2. Then the surface peeling state reflection parameter is (2×0.6)+(2×0.2)=1.2 + 0.4 = 1.6. The surface peeling state reflection parameter is less than the minimum value of the standard peeling state reflection parameter range, and it is determined that the surface peeling state is a non-peeling state; The undulation angle is 6°, and the corresponding undulation angle influence compensation parameter is 0.7; the missing area ratio is 0.06, then the missing area of the stamped part is 6 mm 2 , and the corresponding missing area influence compensation parameter is 0.3. Then the surface peeling state reflection parameter is (6×0.7)+(6×0.3)=4.2 + 1.8 = 6. The surface peeling state reflection parameter is within the standard peeling state reflection parameter range, and it is determined that the surface peeling state is a scaly peeling state; The undulation angle is 10°, and the corresponding undulation angle influence compensation parameter is 0.8; the missing area ratio is 0.08, then the missing area of the stamped part is 8 mm 2 , and the corresponding missing area influence compensation parameter is 0.3. Then the surface peeling state reflection parameter is (10×0.8)+(8×0.3)=8 + 2.4 = 10.4. The surface peeling state reflection parameter is greater than the maximum value of the standard peeling state reflection parameter range, and it is determined that the surface peeling state is a flaky peeling state.

[0038] This technical solution achieves accurate detection and classification of peeling defects on the surface of stamped parts through high-precision 3D laser scanning and quantitative analysis, which mainly brings the following significant advantages. The use of 3D laser scanners can accurately capture the microscopic surface undulations and missing quantitative indicators (undulation angle and missing area ratio), which is more objective and accurate than traditional visual inspection. Flaky peeling indicates excessive punching pressure. If the surface peeling state reflection parameter is greater than the maximum value of the standard peeling state reflection parameter range, the surface peeling state is judged to be flaky peeling. The high surface peeling state reflection parameter can reflect that the undulation angle is too large or the missing area exceeds the standard. Any of these situations may cause the surface of the stamped part to show large-scale peeling or excessive peeling after the stamping is completed. This situation is set as a flaky peeling state and the pressure parameters need to be adjusted. Fish-scale peeling reflects exhaust problems. If the surface peeling state reflection parameter is within the standard peeling state reflection parameter range, the surface peeling state is determined to be fish-scale peeling state. The surface peeling state reflection parameter within the standard peeling state reflection parameter range can reflect that one of the undulation angle or missing area exceeds the standard, or the undulation angle and missing area are both in the middle value, and the stamping surface presents a continuous peeling state. This situation is set as fish-scale peeling state, and the mold exhaust system needs to be checked. The non-peeling state verifies the process stability. Unified quantitative standards replace subjective judgment. Historical data can be traced back to facilitate quality analysis. Provide benchmark data for new mold development.

[0039] The process of determining whether to adjust the initial punching value or detect the compactness of the mold exhaust port according to the surface peeling state includes: When the surface peeling state is flaky peeling, the initial punching value is determined and adjusted. When the surface peeling state is fish scale peeling, the density of the exhaust port of the mold is determined and detected.

[0040] When the surface peeling state is flaky, the stamping device punches the stamped part and injects compressed air (0.2-0.5MPa) into the mold to detect whether the gas leaks from the non-exhaust area. If there is leakage, it indicates insufficient sealing.

[0041] Since the initial punching pressure is too low, the material cannot fully fill the mold cavity, resulting in a large missing area of the stamped part. The missing area is negatively correlated with the initial punching value. Increasing the initial punching value can directly reduce the missing area and inhibit material delamination. The essence of flaking is the peeling of the surface layer of the material from the matrix. When the surface peeling is in the fish-scale peeling state, the fish-scale peeling appears as a small corrugated defect. The mold venting is not smooth, and the material is blocked by the compressed gas when flowing, forming microscopic undulations. Gas retention will cause pressure fluctuations in the mold. When the venting is not smooth, the gas flow rate in the mold decreases sharply, the pressure increases, and the gas is pressed into the material surface to form fish-scale patterns.

[0042] Specifically, the process of determining whether to adjust the initial stamping value by detecting the peeling position of the die after stamping completion includes, Detecting the actual curvature of the stamped part at the peeling position, comparing the actual curvature of the stamped part with the standard curvature of the stamped part to obtain a comparison result of the curvature of the stamped part, and determining whether to use single stamping adjustment or compensation stamping adjustment according to the comparison result of the curvature of the stamped part.

[0043] Detecting the actual curvature of the stamped part at the peeling position. For example, if the peeling position is in the straight area of the stamped part, single stamping adjustment is used; if the peeling position is in the curved area of the stamped part, compensation stamping adjustment is used.

[0044] Specifically, the process of determining whether to use single stamping adjustment or compensation stamping adjustment according to the comparison result of the curvature of the stamped part includes, For the case where the actual curvature of the stamped part is greater than the standard curvature of the stamped part, the initial stamping value is adjusted by using the compensation stamping method; For the case where the actual curvature of the stamped part is less than or equal to the standard curvature of the stamped part, the initial stamping value is adjusted by using the single stamping method; Among them, the single stamping method is to adjust the overall stamping value; the compensation stamping method is to locally adjust the stamping value according to the position where the actual curvature of the stamped part exceeds the standard.

[0045] The standard curvature of the stamped part is set to 10°, and the initial stamping value is set to 1200 kN; among them, the standard curvature of the stamped part is determined according to the plastic deformation ability of the stamping material. For example, if there is no cracking risk when the curvature is less than or equal to 12°, the standard curvature can be set to 10°, leaving a 20% safety margin; If the actual curvature of the stamped part is greater than the standard curvature of the stamped part, the increased initial stamping value is determined according to the difference between the curvature of the stamped part and the standard curvature of the stamped part and the influence compensation parameter of the difference between the curvature of the stamped part and the standard curvature of the stamped part on the initial stamping value. At this time, because the curvature of the stamped part at the peeling position is not obvious compared with its overall curvature, the method of overall reducing the initial stamping value is used to change the peeling phenomenon on the surface of the stamped part. For example, The actual curvature of the stamped part is detected to be 5°, and the influence compensation parameter of the difference between the curvature of the stamped part and the standard curvature of the stamped part on the initial stamping value is set to 50. The influence compensation parameter of the difference between the curvature of the stamped part and the standard curvature of the stamped part on the initial stamping value is determined according to the plastic deformation characteristics of the material. For example, the harder the material (such as high-strength steel), the greater the influence compensation parameter of the difference between the curvature of the stamped part and the standard curvature of the stamped part on the initial stamping value, and the greater the stamping value adjustment required for a unit curvature difference. The stamping value adjustment value required for a unit curvature difference corresponding to soft aluminum can be set to 30 kN / °, and the stamping value adjustment value required for a unit curvature difference corresponding to high-strength steel can be set to 60 kN / °; Then the increased initial punching value is 1200+(10-5)×50=1450kN; If the curvature of the actual stamping part is less than or equal to the curvature of the standard stamping part, the initial stamping value of the single stamping method is increased according to the difference between the curvature of the stamping part and the curvature of the standard stamping part. At this time, since the curvature of the stamping part at the peeling position is significantly different from its overall curvature, the use of the compensating stamping method may cause damage to the stamping part as a whole, so the single stamping method will be used to adjust the initial stamping value of the corresponding peeling position; In this embodiment, when a single punching method is required to adjust the initial punching value corresponding to the peeling position, an independent pressure unit is installed at the punching device position corresponding to the peeling position, thereby adjusting the punching value of the peeling position; The pressure is increased only at the peeling position, and the actual stamping part curvature is detected to be 15°. The compensation parameter of the difference between the stamping part curvature and the standard stamping part curvature on the initial stamping value is set to 50. The initial stamping value after adjustment is 1200-(15-10)×50=950kN.

[0046] This technical solution targets flaky peeling (material peeling defects): by reducing the punching force (such as from 1200kN to 950kN), the shear stress is directly reduced to effectively suppress the material delamination phenomenon. If the actual stamping part curvature is greater than the standard stamping part curvature, the increased initial stamping value is determined according to the compensation parameters of the difference between the stamping part curvature and the standard stamping part curvature and the difference between the stamping part curvature and the standard stamping part curvature on the initial stamping value. At this time, because the curvature of the stamping part at the peeling position is not obvious compared to its overall curvature, the initial stamping value is adjusted as a whole to change the peeling phenomenon on the surface of the stamping part. The pressure adjustment amount is accurately calculated by the curvature difference to avoid empirical trial and error. Improve gas fluidity through exhaust detection and speed adjustment. Single stamping adjustment is adopted in the straight line area, and the overall pressure is adjusted. If the actual stamping part curvature is less than or equal to the standard stamping part curvature, the initial stamping value of a single stamping method is increased according to the difference between the stamping part curvature and the standard stamping part curvature. At this time, since the stamping part curvature at the peeling position is much different from its overall curvature, the use of compensatory stamping may cause damage to the stamping part as a whole, so a single stamping method will be used to adjust the initial stamping value of the corresponding peeling position. Compensatory stamping is used in the bending area, and local pressure adjustment is carried out accurately. The adjustment parameters are linearly related to the curvature difference to achieve quantitative control. When the curvature is insufficient, the pressure is increased to compensate, and when the curvature is too large, the pressure is reduced to correct. The pressure adjustment amplitude is proportional to the curvature deviation to ensure the correction accuracy.

[0047] Specifically, the process of determining whether to adjust the ramming speed according to the ramming gas volume comparison result includes: When the punching gas volume comparison result shows that the punching part volume is greater than the maximum exhaust fluctuation volume, the punching speed is reduced according to the difference between the punching part volume and the exhaust volume; For the case where the volume of the stamping gas comparison result shows that the volume of the stamped part is less than the minimum value of the exhaust gas volume fluctuation, increase the stamping speed according to the difference between the exhaust gas volume and the volume of the stamped part. For the case where the volume of the stamping gas comparison result shows that the volume of the stamped part is within the range of the exhaust gas volume fluctuation, maintain the original stamping speed.

[0048] In this embodiment, the volume of the stamped part is calculated by 3D scanning, the range of gas volume fluctuation is detected by a flow sensor at the exhaust port of the mold, the initial stamping speed is set to 50 mm / s, and the range of the exhaust gas volume fluctuation is set to [90, 110]. If the volume of the stamping gas comparison result shows that the volume of the stamped part is greater than the maximum value of the exhaust gas volume fluctuation, determine the reduced stamping speed according to the product of the difference between the volume of the stamped part and the maximum value of the exhaust gas volume fluctuation and the influence compensation parameter of the initial stamping speed. Among them, the stamping speed is negatively correlated with the difference between the volume of the stamped part and the maximum value of the exhaust gas volume fluctuation, and the negative correlation ratio of the stamping speed to the difference between the volume of the stamped part and the maximum value of the exhaust gas volume fluctuation is determined according to the preset negative correlation ratio. The negative correlation ratio of the stamping speed to the difference between the volume of the stamped part and the maximum value of the exhaust gas volume fluctuation is set to 0.4, and the reduced stamping speed is 50 - 0.4×20 = 42 m / s. If the volume of the stamping gas comparison result shows that the volume of the stamped part is less than the minimum value of the exhaust gas volume fluctuation, determine the increased stamping speed according to the difference between the minimum value of the exhaust gas volume fluctuation and the volume of the stamped part and the influence compensation parameter of the difference between the minimum value of the exhaust gas volume fluctuation and the volume of the stamped part on the initial stamping speed. Among them, the stamping speed is positively correlated with the difference between the minimum value of the exhaust gas volume fluctuation and the volume of the stamped part, and the positive correlation ratio of the stamping speed to the difference between the minimum value of the exhaust gas volume fluctuation and the volume of the stamped part is determined according to the preset positive correlation ratio. The positive correlation ratio of the difference between the volume of the stamped part and the exhaust gas volume fluctuation is 0.2, and the increased stamping speed is 50 + 0.2×30 = 56 mm / s. For the case where the volume of the stamping gas comparison result shows that the volume of the stamped part is within the range of the exhaust gas volume fluctuation, maintain the original stamping speed.

[0049] Specifically, the process of adjusting the initial stamping value by adopting the compensated stamping method includes If the surface peeling state reflection parameter is re-detected after the adjustment by the compensated stamping method, for the case where the re-detected surface peeling state reflection is greater than the set maximum peeling state reflection parameter, determine that the corresponding stamped part is a defective product.

[0050] Specifically, the process of determining whether the stamped part meets the stamping requirements according to the surface peeling state includes Perform stamping again according to the adjusted stamping value and stamping speed, and determine the surface peeling state of the stamped part after stamping to ensure that the stamped part meets the stamping requirements.

[0051] This technical solution realizes the closed-loop optimization control of the stamping process by establishing a dynamic coupling relationship among gas volume - stamping speed - pressure parameters. There is a rapid response to excessive exhaust, and a multi-parameter collaborative control mechanism. It can effectively determine whether the surface peeling state meets the stamping requirements. If the comparison result of the stamping gas volume shows that the volume of the stamped part is greater than the maximum value of the exhaust fluctuation volume, determine the reduced stamping speed according to the product of the difference between the volume of the stamped part and the maximum value of the exhaust fluctuation volume and the influence compensation parameter of the initial stamping speed. Among them, the stamping speed is negatively correlated with the difference between the volume of the stamped part and the maximum value of the exhaust fluctuation volume, and the negative correlation ratio of the stamping speed to the difference between the volume of the stamped part and the maximum value of the exhaust fluctuation volume is determined according to the preset negative correlation ratio, which can extend the gas discharge time and avoid pores or surface peeling caused by residual gas in the material compression. If the comparison result of the stamping gas volume shows that the volume of the stamped part is less than the minimum value of the exhaust fluctuation volume, determine the increased stamping speed according to the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part and the influence compensation parameter of the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part on the initial stamping speed. Among them, the stamping speed is positively correlated with the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part, and the positive correlation ratio of the stamping speed to the difference between the minimum value of the exhaust fluctuation volume and the volume of the stamped part is determined according to the preset positive correlation ratio, which can reduce the ineffective exhaust time, reduce the risk of impurity inhalation, and improve production efficiency. Automatically match the adjustment range through material characteristics (such as aluminum alloy or high-strength steel) and die state to avoid manual trial and error.

[0052] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0053] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preventing peeling based on high-density exhaust die technology, characterized in that, including the following steps, stamping the die to be stamped based on the initial stamping value, detecting the surface peeling state of the die after stamping through a peeling detection device, and determining whether to adjust the initial stamping value or whether to detect the tightness of the die exhaust port based on the surface peeling state; for the case where the initial stamping value needs to be adjusted, determining whether to adjust the initial stamping value by detecting the peeling position of the die after stamping; for the case where the tightness of the die exhaust port needs to be detected, obtaining the exhaust gas volume in the die cavity during stamping and the volume of the stamped part after stamping, comparing the exhaust gas volume and the volume of the stamped part to obtain a comparison result of the stamping gas volume, and determining whether to adjust the stamping speed based on the comparison result of the stamping gas volume; determining whether the stamped part meets the stamping requirements based on the surface peeling state.

2. The anti-peeling method based on the high-density exhaust die technology according to claim 1, characterized in that The process of detecting the surface peeling state of the die after stamping through a peeling detection device includes, detecting the surface undulation angle and the missing area of the stamped part through a scanning device to obtain a surface peeling state reflection parameter, comparing the surface peeling state reflection parameter with a standard surface peeling state reflection parameter range, and determining the surface peeling state of the stamped part based on the comparison result of the surface peeling state reflection parameter; wherein, the surface peeling state includes a flaky peeling state, a fish-scale peeling state, and a non-peeling state.

3. The anti-peeling method based on the high-density exhaust die technology according to claim 2, wherein The process of detecting the surface undulation angle and the missing area of the stamped part through a scanning device to obtain a surface peeling state reflection parameter includes, determining the category of the actual undulation angle detected according to a preset standard undulation range, determining the influence evaluation value of the missing area on the surface peeling state reflection parameter according to the missing area ratio, and determining the surface peeling state reflection parameter according to the actual undulation angle and the missing area; wherein, the missing area ratio is the ratio of the actual missing area to the surface area of the stamped part.

4. The anti-peeling method based on the high-density exhaust die technology according to claim 3, wherein Specifically, the process of determining the surface peeling state of the stamped part based on the comparison result of the surface peeling state reflection parameter includes, for the case where the comparison result of the surface peeling state reflection parameter is that the surface peeling state reflection parameter is greater than the maximum value of the standard surface peeling state reflection parameter range, determining the surface peeling state as a flaky peeling state; for the case where the comparison result of the surface peeling state reflection parameter is that the surface peeling state reflection parameter is within the standard surface peeling state reflection parameter range, determining the surface peeling state as a fish-scale peeling state; for the case where the comparison result of the surface peeling state reflection parameter is that the surface peeling state reflection parameter is less than or equal to the minimum value of the standard surface peeling state reflection parameter range, determining the surface peeling state as a non-peeling state.

5. The anti-peeling method based on the high-density exhaust die technology according to claim 4, characterized in that The process of determining whether to adjust the initial stamping value or whether to detect the tightness of the die exhaust port based on the surface peeling state includes, for the case where the surface peeling state is a flaky peeling state, determining to adjust the initial stamping value; for the case where the surface peeling state is a fish-scale peeling state, determining to detect the tightness of the die exhaust port.

6. The anti-peeling method based on the high-density exhaust die technology according to claim 5, characterized in that The process of determining whether to adjust the initial stamping value by detecting the peeling position of the die after stamping includes, Detect the actual curvature of the stamped part at the peeling position, compare the actual curvature of the stamped part with the standard curvature of the stamped part to obtain the comparison result of the curvature of the stamped part, and determine whether to adopt single stamping adjustment or compensation stamping adjustment according to the comparison result of the curvature of the stamped part.

7. The anti-peeling method based on the high-density exhaust die technology according to claim 6, characterized in that, The process of determining whether to adopt single stamping adjustment or compensation stamping adjustment according to the comparison result of the curvature of the stamped part includes For the case where the actual curvature of the stamped part is greater than the standard curvature of the stamped part, adjust the initial stamping value by adopting the compensation stamping method; For the case where the actual curvature of the stamped part is less than or equal to the standard curvature of the stamped part, adjust the initial stamping value by adopting the single stamping method; Among them, the single stamping method is to adjust the overall stamping value; the compensation stamping method is to locally adjust the stamping value according to the position where the actual curvature of the stamped part exceeds the standard.

8. The anti-peeling method based on the high-density exhaust die technology according to claim 7, characterized in that, The process of determining whether to adjust the stamping speed according to the comparison result of the volume of the stamping gas includes For the case where the comparison result of the volume of the stamping gas is that the volume of the stamped part is greater than the maximum value of the exhaust fluctuation volume, reduce the stamping speed according to the difference between the volume of the stamped part and the exhaust volume; For the case where the comparison result of the volume of the stamping gas is that the volume of the stamped part is less than the minimum value of the exhaust fluctuation volume, increase the stamping speed according to the difference between the exhaust volume and the volume of the stamped part; For the case where the comparison result of the volume of the stamping gas is that the volume of the stamped part is within the exhaust volume fluctuation range, maintain the original stamping speed.

9. The anti-peeling method based on the high-density exhaust die technology according to claim 8, characterized in that, The process of adjusting the initial stamping value by adopting the compensation stamping method includes If the surface peeling state reflection parameter is re-detected after adjustment by adopting the compensation stamping method, and for the case where the re-detected surface peeling state reflection is greater than the set maximum peeling state reflection parameter, determine that the corresponding stamped part is a defective product.

10. The anti-peeling method based on the high-density exhaust die technology according to claim 9, characterized in that, The process of determining whether the stamped part meets the stamping requirements according to the surface peeling state includes Perform stamping again according to the adjusted stamping value and stamping speed, and determine the surface peeling state of the stamped part after stamping to ensure that the stamped part meets the stamping requirements.

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