Leak-proof sealing punch forming process

Abstract

According to the anti-leakage sealing punch forming process, pressure data of all areas are collected, and the pressure mean values F < high >, F < low > and alpha < lip > are obtained through a control module; if the alpha lip exceeds the preset threshold value, it is indicated that the pressure imbalance phenomenon (abnormal pressure) exists on the sealing lip edge, local sealing failure or excessive extrusion deformation is possibly caused, and therefore the specific reason causing the pressure imbalance phenomenon can be deduced by judging whether the pressure mean values F high and F low are abnormal or not again.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping and forming processes, and in particular to a leak-proof sealing stamping and forming process. Background Art

[0002] In the automotive manufacturing field, the reliability of the sunroof system directly affects the user experience and durability of the entire vehicle; in extreme rainfall weather, the good sealing performance of the sunroof frame can effectively prevent rainwater from flowing back, preventing the carpet, seats and other parts in the car from becoming moldy and deformed due to water immersion; in the face of harsh road conditions with raging wind and sand, the tight sealing structure can prevent the intrusion of sand and dust particles and protect the precision electronic components in the car from wear; therefore, the sealing performance of the sunroof frame is directly related to the user experience.

[0003] The sealing lip (located inside the sunroof frame's frame border within the closed or semi-closed space formed between the sunroof frame and the glass assembly surface) is the core structure of the sunroof frame's waterproof and dustproof functions. Its performance stability is directly related to the sealing performance of the entire vehicle. However, during actual manufacturing, abnormal sealing lip pressure is a common problem. Traditional detection methods focus solely on monitoring a single lip pressure value, making it difficult to accurately pinpoint the source of the abnormality. For example, when sealing and stamping a sunroof frame made of welded materials, since the welded materials are composed of high-strength and low-strength steel, any abnormal lip pressure could be due to excessive pressure on the low-carbon steel area during the stamping process, resulting in a conduction effect. Alternatively, it could be due to insufficient restraint in the high-strength steel area due to improper structural design or process parameters, leading to an overall pressure imbalance. However, existing monitoring methods cannot accurately and quickly determine the specific source of the problem, making it difficult to implement a timely response. Therefore, a sealing stamping process is needed that can quickly identify and address abnormal sealing lip pressure during the stamping process of welded sunroof frames. Summary of the Invention

[0004] The purpose of the present invention is to design a leak-proof sealing stamping process to solve the problems raised in the background art. To achieve the above purpose, the present invention provides the following technical solution: comprising the following steps: Step 1: Deploy several pressure monitoring points in the high-strength steel frame area, the low-carbon steel middle area, and the sealing lip area of ​​the skylight frame tailor-welded blanks, collect pressure data from each area in real time, and transmit it to the control module; Step 2: The control module calculates the mean pressure F of the high-strength steel frame area based on the pressure data of each area. 高 , the average pressure F in the middle area of ​​low carbon steel 低 and the pressure variance ɑ in the sealing lip area 唇 ; Step 3: Control module determines ɑ 唇is greater than a threshold value, when the determination result is no, returning to step 2, and when the determination result is yes, further determining F 低 is greater than a threshold value, when the determination result is yes, executing step 4, and when the determination result is no, executing step 5; Step 4, the control module controls the stamping pressure of the low carbon steel middle region to decrease by gradient, while monitoring the pressure variance of the sealing lip edge region until a 唇 is less than a threshold value; Step 5, the control module determines F 高 is less than a threshold value, when the determination result is yes, the control module controls the stamping pressure of the high strength steel frame region to increase by gradient, while monitoring the pressure variance of the sealing lip edge region until a 唇 is less than a threshold value; and when the determination result is no, returning to step 2.

[0005] Further, in step 5, the control module determines F 高 is less than a threshold value, when the determination result is no, the control module determines F 低 / F 高 is greater than a threshold value, when the determination result is no, entering step 2, and when the determination result is yes, the control module controls the stamping pressure of the low carbon steel middle region to decrease by gradient while controlling the stamping pressure of the high strength steel frame region to increase by gradient until F 低 / F 高 is less than a threshold value.

[0006] Further, in step 2, the control module further calculates the pressure variance a 高 of the high strength steel frame region and the pressure variance a 低 of the low carbon steel middle region according to the pressure data of each region respectively; the control module calculates the low carbon steel stability coefficient K 高 =F 低 / F 高 and the high strength steel stability coefficient K 低 =F 低 / ɑ 低 according to F 低 , F 高 , a 高 and a 高 respectively; if the values of K 低 and K 高 are not within the corresponding threshold value interval range, it is determined that the pressure of the low carbon steel middle region or the high strength steel frame region is abnormal, and an alarm is issued while the stamping operation is stopped.

[0007] Further, it further comprises step 6, in step 5, when the determination result of whether F 高 is less than a threshold value is no, entering step 6, Step 6: The stamping process of the skylight frame welded blank is divided into the drawing stage, the bending stage and the shaping stage. After the control module monitors the pressure in each stamping stage, it stores the pressure values ​​in the order of stamping depth and draws a curve F showing the pressure value changing with depth. 拉 (s), F 弯 (s) and F 整 (s), and calculate the net pressure accumulation value of each stamping stage as I 拉 = , I 弯 = and I 整 = ; F 密 is the real-time pressure in the sealed cavity during the same period. The sealed cavity is a closed or semi-closed space formed between the skylight frame and the glass assembly surface. The threshold range (Z1, Z2) of the comprehensive net pressure accumulation detection parameter is pre-entered in the control module. The control module is based on I 拉 , I 弯 and I 整 Calculate the comprehensive net pressure accumulation detection parameter Z=(I 拉 / 0.3+I 弯 / 0.4+I 整 / 0.3) / 3; and when it is determined that Z does not belong to the interval (Z1, Z2), it will enter the pressure accumulation abnormality judgment mode. When it is determined that Z belongs to the interval (Z1, Z2), it will return to step 2.

[0008] Furthermore, the standard net pressure accumulation value I0 during the complete stamping process is pre-input into the control module, so the judgment mode of abnormal pressure accumulation is: If Z>Z2, and I 拉 When >0.3I0, the control module reduces the stamping speed in the drawing stage by 10%-15%; When Z <Z1,且I 整 When the pressure is less than 0.3I0, the control module increases the average pressure in the shaping stage by 5%-8%, reduces the shaping speed by 4%-6%, and extends the pressure holding time in the shaping stage to 0.5-1.5 seconds.

[0009] Further, in step 6, the control module calculates the change rate d1=I in the drawing stage, the bending stage and the shaping stage 拉 / ds、d2=dI 弯 / ds and d3=dI 整 / ds; When the rate of change is greater than the corresponding threshold, the control module issues an alarm and stops the stamping operation.

[0010] Furthermore, in step 4, when the control module controls the stamping pressure of the middle area of ​​the mild steel to decrease according to the gradient, it pauses for 0.5-1 second every time the pressure decreases by 10 kN.

[0011] Compared with the prior art, the present invention has the following advantages: the present invention collects pressure data of each area and controls the pressure mean value F of the module. 高 、F 低 and ɑ 唇 ; If 唇 If the pressure exceeds the predetermined threshold, it indicates that there is pressure imbalance (abnormal pressure) on the sealing lip, which may cause local sealing failure or excessive extrusion deformation. Therefore, the pressure mean F is re-determined at this time. 高 、F 低 Whether it is abnormal or not can be used to infer the specific cause of the pressure imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a schematic diagram of the stamping process of the present invention. DETAILED DESCRIPTION

[0014] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0015] Example: With the development of automobile lightweight technology, and because tailor-welded materials are welded from plates of different strengths, thicknesses and materials, they can achieve weight reduction while meeting structural performance requirements. Therefore, tailor-welded materials are increasingly used in automobile sunroof frame stamping parts. When sunroof frames made of tailor-welded materials are sealed and stamped, due to the different characteristics of the plates in the tailor-welded blanks and the difference in plate thickness, the stamping requirements for different areas of the tailor-welded blanks (such as forming force, gap between male and female dies, and stretching amount) are also different. Therefore, in order to ensure the forming accuracy of sunroof frames made of tailor-welded materials and improve product quality, a block mold can be used to perform multi-stage stamping on the sunroof frame. The block module divides the forming part of the mold into multiple independent modules, each module corresponding to a "homogeneous area" of the tailor-welded blank (such as a high-strength steel area or a thin plate area), and the appropriate cutting edge, fillet, gap and other parameters are designed respectively to avoid local cracking, wrinkling or excessive deformation caused by a "one-size-fits-all" overall mold. Although the use of a segmented mold can improve the forming accuracy of a sunroof frame made of welded materials, the stamping quality of the sealing lip (the sealing lip located inside the sunroof frame frame in the closed or semi-closed space formed between the sunroof frame and the glass assembly surface) is particularly important for sunroof frames that require high sealing performance. However, when using a segmented mold for stamping, due to the different stamping parameters in each area, such as the stamping speed and stamping pressure in each area, this can easily lead to different pressures in different areas of the sealing lip, resulting in frequent abnormal sealing lip pressures and affecting the stamping quality of the sealing lip. Therefore, timely detection and judgment of abnormal sealing lip pressure is particularly important. However, traditional detection methods focus solely on monitoring a single lip pressure value, making it difficult to pinpoint the source of anomalies. For example, when stamping a sunroof frame made of welded materials, abnormal lip pressure could be caused by excessive pressure on the low-carbon steel area during the stamping process, resulting in a conduction effect. Alternatively, it could be caused by insufficient restraint in the high-strength steel area due to improper structural design or process parameters, leading to an overall pressure imbalance. However, existing monitoring methods cannot accurately and quickly determine the specific source of the problem, making it difficult to implement a timely response.

[0016] In this embodiment, please refer to Figure 1 , discloses a leak-proof sealing stamping molding process, comprising the following steps: Step 1: Deploy several pressure monitoring points in the high-strength steel frame area, the low-carbon steel middle area, and the sealing lip area of ​​the skylight frame tailor-welded blanks, collect pressure data from each area in real time, and transmit it to the control module; Step 2: The control module calculates the mean pressure F of the high-strength steel frame area based on the pressure data of each area. 高 , the average pressure F in the middle area of ​​low carbon steel 低 and the pressure variance ɑ in the sealing lip area 唇 ; Among them, ɑ 唇 As a key indicator for measuring the degree of pressure dispersion at the sealing lip of a tailor-welded blank skylight frame, its value directly reflects pressure fluctuations at different measurement points or time periods. If the variance exceeds a predetermined threshold, it indicates pressure imbalance (pressure anomaly) at the sealing lip, which may lead to localized sealing failure or excessive extrusion deformation. Therefore, it can be combined with other parameters for collaborative analysis to locate the root cause of the anomaly. Step 3: Control module determines ɑ 唇 Is it greater than the threshold? If the judgment result is yes, it is preliminarily determined that there is an abnormality in the pressure of the sealing lip area, and then the control module further determines F 低Is it greater than the threshold? If the result is yes, it means that the abnormal sealing lip pressure is caused by the excessively high pressure effect in the mild steel area, which can easily cause bulging of the sealing lip. At this time, the control module controls the stamping pressure in the middle area of ​​the mild steel to decrease according to the gradient in step 4, and pauses for 0.5-1 seconds every time the stamping pressure decreases by 10kN to ensure the stability of the stamping quality until the pressure variance ɑ in the sealing lip area is 唇 Less than the threshold; if F 低 If it is less than the threshold, go to step 5; Step 5: The control module determines F 高 Is it less than the threshold? If the judgment result is yes, it means that the abnormal pressure of the sealing lip is caused by insufficient pressure effect in the high-strength steel area, which is likely to cause the sealing lip to rebound. At this time, the control module controls the stamping pressure of the high-strength steel frame area to increase according to the gradient, while reducing the stamping speed and extending the pressure action time until ɑ 唇 If the pressure is less than the threshold, the temperature control method can also be started during this process to heat up the high-strength steel area, thereby reducing the required punching force and reducing the occurrence of sealing lip rebound.

[0017] Although the above methods can solve the bulging or rebound phenomenon of the sealing lip, the problems caused by the sealing lip are not limited to these two phenomena. There is also the phenomenon of distortion of the sealing lip. Therefore, when F 低 Less than the threshold and F 高 When the value is greater than the threshold, the occurrence of bulging and rebound problems is eliminated; then the control module will determine F 低 / F 高 Is the value greater than the threshold? If the judgment result is yes, it means that the pressure distribution between the high-strength steel frame area and the low-carbon steel middle area is seriously unbalanced, which will cause the sealing lip to twist. At this time, the control module gradually reduces the stamping pressure of the low-carbon steel middle area and increases the stamping pressure of the high-strength steel frame area at the same time until F 低 / F 高 The value of is less than the threshold value, so that the pressure distribution between the high-strength steel frame area and the low-carbon steel middle area becomes more balanced, preventing the sealing lip from being twisted.

[0018] In step 2, the control module also calculates the pressure variance of the high-strength steel frame area based on the pressure data of each area. 高 Pressure variance in the middle area of ​​mild steel 低 ; The control module passes F 高 、F 低 、ɑ 高 and ɑ 低 Calculate the stability coefficient K of mild steel separately 低 =F 低 / ɑ低 and high strength steel stability factor K 高 =F 高 / ɑ 高 If K 低 and K 高 If the value of is not within the corresponding threshold range, the pressure in the middle area of ​​the low-carbon steel or the high-strength steel frame area is determined to be abnormal, and an alarm is issued while the stamping operation is stopped; 低 and K 高 Reflects the sensitivity of the material to pressure changes. If K 低 and K 高 Too large: means F 高 and F 低 Relative ɑ 高 and ɑ 低 If the pressure is too high, that is, the average pressure is high but the fluctuation amplitude is small, which indicates that the material is in an overpressure state, which may cause excessive deformation of the sealing lip, shorten the fatigue life, or even plastic deformation failure. Therefore, it is necessary to reduce the pressure setting value and optimize the pressure control algorithm to enhance the dynamic response capability of pressure fluctuations. If K 低 and K 高 Too small: means F 高 and F 低 Relative ɑ 高 and ɑ 低 If it is too small, that is, the average pressure is low but fluctuates violently, this may cause the sealing lip to not fit tightly and cause sealing failure. Therefore, the pressure average should be increased at this time, and the damping of the pressure control system should be increased at the same time to suppress abnormal fluctuations, thereby further improving the detection of stamping anomalies of the sealing lip during the stamping process and making corresponding countermeasures, thereby improving the sealing stamping quality of the skylight frame made of welded materials.

[0019] If F 低 Less than the threshold, F 高 Greater than the threshold, F 低 / F 高 Less than the threshold, and K 低 and K 高If it is within the threshold range, it means that during the stamping process, the short stamping process will not cause obvious stamping anomalies on the sealing lip; but this cannot completely determine that there are no defects on the sealing lip after stamping; because the plastic deformation of low-carbon steel and high-strength steel in the tailor-welded plate is not only related to the "instantaneous pressure", but also related to the "pressure action time (or stroke)". For example, under normal circumstances, the stamping process of the tailor-welded plate of the skylight frame is divided into three stages: the drawing stage, the bending stage and the shaping stage: in the drawing stage, if the instantaneous pressure is always within the qualified range, but the action time is too long (the stroke is too large), it will cause the material to be "overstretched". This cumulative effect cannot be reflected by the mean (the average pressure at a certain moment) or the variance (the degree of pressure fluctuation). After testing, it was found that when the above situation occurs, This can cause delayed bulging of the sealing lip 24 hours after stamping (the lip bulge is ≤0.05mm upon completion of stamping, but increases in height by ≥0.03mm 24 hours later (natural aging), resulting in product defects. During the shaping stage, even if the instantaneous pressure is acceptable, if the action time is insufficient (stroke is too short), the accumulated pressure cannot offset the material's elastic recovery tendency, leading to "aging rebound" (excessive rebound within 30 days) after lip assembly. Simply using stroke to determine the effect is even more limited, as it is relative to stroke; pressure is the primary factor causing the anomaly. In summary, using either pressure or stroke alone cannot fully reflect the long-term impact of die pressure on the tailor-welded blank during stamping. Therefore, it is necessary to combine "pressure magnitude" with "action stroke" to quantify this "time-dependent deformation." Therefore, in this embodiment, step 6 is also included, after the control module monitors the pressure at each stamping stage, the pressure values ​​are stored in the order of stamping depth, and a curve F is drawn showing the pressure value changing with the depth. 拉 (s), F 弯 (s) and F 整 (s), and calculate the net pressure accumulation value of each stamping stage as I 拉 = , I 弯 = and I 整 = ; This integration process reflects the total “energy input” of the plastic deformation of the material at each stage, F 密is the real-time pressure within the sealing cavity during the same period (this pressure is not the stamping pressure that directly affects material forming, so the interference of the sealing pressure on the stamping process must be deducted to eliminate the influence of this non-stamping core forming force. This ensures that the calculated integrals of each stage, such as the drawing stage, the bending stage, and the shaping stage, can accurately reflect the effective forming pressure on the material during the actual stamping process, thereby improving the accuracy of abnormal sealing lip pressure judgment and avoiding misjudgment of the stamping status due to irrelevant pressure interference. This demonstrates the accuracy of this judgment method compared to conventional testing and can more effectively reflect the long-term impact of mold pressure on the tailor-welded blank during the stamping process). The sealing cavity is the closed or semi-closed space formed between the skylight frame and the glass assembly surface; The threshold interval (Z1, Z2) of the comprehensive net pressure accumulation detection parameter is pre-entered in the control module. The control module 拉 , I 弯 and I 整 Calculate the comprehensive net pressure accumulation detection parameter Z=(I 拉 / 0.3+I 弯 / 0.4+I 整 / 0.3) / 3, where, under ideal conditions (i.e., the sealing lip stamping quality is qualified), I 拉 / 0.3=I 弯 / 0.4=I 整 / 0.3, 0.3, 0.4 and 0.3 are the weight coefficients of each stamping stage on the stamping quality of the sealing lip, which are used to quantify the difference in contribution of different stamping stages to the final quality of the sealing lip and avoid the judgment deviation caused by treating the integrals of each stage equally. Therefore, according to the difference in the effect of different stamping stages on lip forming, the weight size is matched with the stage function; Since the stretching stage is the key link in the formation of the lip corner, the angle accuracy and flatness of the corner directly determine the sealing fit with the glass (experimental data show that a 10% pressure fluctuation in the bending section will cause the lip flatness to exceed the tolerance by 0.08mm, accounting for 45% of the total defects), so the weight accounts for a large proportion; the main function of the drawing section is to stretch the material to form the basic contour of the lip. If the integral is excessive, it will cause bulging in the later stage, but the impact on the sealing performance of the lip is weaker than that of the bending section. The shaping section is used to lock the shape of the lip. Insufficient integral will cause springback, but the springback is mostly aging deformation (within 30 days), but the impact on the sealing performance of the lip is also weaker than that of the bending section. Therefore, the weights of the shaping section and the drawing section are lower than those of the drawing section. Therefore, after the experiment of controlling variables, the weights of the drawing stage, bending stage and shaping stage are finally taken as 0.3, 0.4 and 0.3 respectively; at this time (I 拉 / 0.3+I 弯 / 0.4+I 整 / 0.3) / 3 is expressed as the comprehensive net pressure accumulation detection parameter. It not only reflects the long-term impact of the die on the tailor-welded blank during the entire stamping process, but also, compared to the common accumulation, this formula not only uses the cumulative impact of integration, but also considers the different contributions of different stamping stages to the final quality of the sealing lip. This avoids the judgment deviation caused by treating the integration of each stage equally, and greatly improves the accuracy of sealing lip abnormality judgment; When the control module determines that Z does not belong to the interval (Z1, Z2), it will enter the pressure accumulation abnormality judgment mode. If Z>Z2, since the overpressure has a greater impact on the stretching stage, the control module will judge I 拉 Is >0.3I0 true? If so, it means that the problem of bulging of the sealing lip will occur in the later stage. At this time, the control module adopts "segmented pressure compensation", that is, the pressure of the first 50% of the drawing section is reduced by 10%, and the original pressure is maintained in the last 50% of the drawing section to ensure that the total integral drops to the target value and the overall average pressure is still within the threshold range; secondly, the drawing section is reduced by 10%-15%, and the pressure input per unit time is reduced by extending the stroke time, thereby further suppressing the excess integral (experiments have shown that there is a linear relationship between speed reduction and integral reduction. For every 5% reduction in speed, the integral can be reduced by about 4%). Then, the lip bulge can be detected (it must meet ≤0.05mm, otherwise continue to adjust to prevent the problem of bulging), and the dimensional change after 24 hours is tracked to ensure that the bulge increment is ≤0.03mm. The detection of bulge can be monitored by a laser profiler; When Z <Z1,由于欠压对于整形阶段产生的影响较大,故此时控制模块将判定I 整 Is <0.3I0 true? If so, it means that the sealing lip will rebound due to aging. At this time, the control module first ensures that the average pressure is within the threshold range while increasing the average pressure in the shaping stage by 5%-8%. Second, the shaping speed is reduced by 4%-6%. Third, the pressure holding time in the shaping stage is extended to 0.5-1.5 seconds, and a "step-by-step pressure holding" method is adopted. The target pressure is maintained at the initial stage of pressure holding, and slowly reduced to 90% in the later stage (the last 0.2 seconds) to avoid stress rebound caused by sudden pressure relief. In addition, if it is judged that Z belongs to the interval (Z1, Z2), it means that there will be no problems of aging rebound and late bulging.

[0020] The standard net pressure accumulation value I0 of the complete stamping process is pre-entered into the control module, and the control module calculates the change rate d1=I in the drawing stage, bending stage and shaping stage in real time. 拉 / ds、d2=dI 弯 / ds and d3=dI 整 / ds; When the rate of change is greater than the corresponding threshold, the control module will sound an alarm and stop the stamping operation. Taking the bending stage as an example, when d2 is greater than the corresponding threshold (usually set to a fluctuation of 15%), it means that the pressure accumulation in the bending stage is unstable, which is easy to cause the problem of corner deformation. Therefore, in order to eliminate the shape abnormality caused by instantaneous jump, a high-frequency pressure sensor (sampling frequency 1kHz) is arranged in the bending section mold. When the integral instantaneous jump is detected to be greater than 10%, the servo hydraulic valve group adjustment is immediately triggered: when the jump becomes positive, the local pressure is reduced by 8%, and when the jump becomes negative, the local pressure is increased by 10%, ensuring I 弯 The fluctuation is controlled within 8%; secondly, a 0.5mm thick elastic compensation block (made of 65Mn spring steel) is added at the bending corner to absorb ±5% pressure fluctuations through elastic deformation. At the same time, the mold guide mechanism is optimized to reduce the sliding friction coefficient from 0.12 to 0.08 (by spraying molybdenum disulfide coating) to reduce the integral fluctuation caused by mechanical vibration; thirdly, the stamping speed of the bending section is reduced by 15%-20% (such as from 1.0m / s to 0.8-0.85m / s) to reduce the inertial impact of the material; simultaneously, a "progressive blank holding force" is adopted (such as linearly increasing from the initial 20kN to 30kN) to avoid uneven material flow caused by sudden pressure changes, thereby stabilizing the pressure accumulation during the stamping process, reducing the flatness at the corner, and eliminating shape abnormalities caused by instantaneous jumps.

[0021] In summary, in this embodiment, in the stamping process of the skylight frame made of butt-welded material using a segmented mold, it is only necessary to collect the pressure values ​​at various locations inside each area in real time. The entire detection process in the present invention can then accurately detect the root cause of the abnormal pressure on the sealing lip in the skylight frame during the stamping process, and take measures to effectively eliminate the abnormal pressure on the sealing lip, provide adjustment parameters for subsequent stamping, and thereby ensure the stamping quality of the subsequent skylight frame; at the same time, it can also play a role in predicting the wear of the mold, thereby comprehensively improving the stamping quality of the sealing lip in the skylight frame made of butt-welded material when stamping using a segmented mold.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "upper," "lower," "left," "right," "front," "rear," and similar expressions used herein are for illustrative purposes only.

[0023] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A leak-proof sealing stamping process, characterized in that: The following steps are involved: Step 1: Deploy several pressure monitoring points in the high-strength steel frame area, the low-carbon steel middle area, and the sealing lip area of ​​the skylight frame tailor-welded blanks, collect pressure data from each area in real time, and transmit it to the control module; Step 2: The control module calculates the mean pressure F of the high-strength steel frame area based on the pressure data of each area. 高 , the average pressure F in the middle area of ​​low carbon steel 低 and the pressure variance ɑ in the sealing lip area 唇 ; Step 3: Control module determines ɑ 唇 Is it greater than the threshold? If the result is no, return to step 2. If the result is yes, further determine F 低 Is it greater than the threshold? If the result is yes, go to step 4; otherwise, go to step 5. Step 4: The control module controls the stamping pressure in the middle area of ​​the mild steel to decrease in a gradient, and monitors the pressure variance in the sealing lip area until ɑ 唇 Less than the threshold; Step 5: The control module determines F 高 Is it less than the threshold? If the judgment result is yes, the control module controls the stamping pressure of the high-strength steel frame area to increase according to the gradient, and at the same time monitors the pressure variance of the sealing lip area until ɑ 唇 Less than the threshold; when the judgment result is no, return to step 2.

2. The anti-leakage sealing stamping forming process according to claim 1, characterized in that: In step 5, the control module determines F 高 If the result of the judgment of whether it is less than the threshold is no, the control module will judge whether F 低 / F 高 Is the value greater than the threshold? If the judgment result is no, it goes to step 2. If the judgment result is yes, the control module reduces the stamping pressure of the middle area of ​​the low-carbon steel by gradient and increases the stamping pressure of the high-strength steel frame area by gradient until F 低 / F 高 The value is less than the threshold.

3. The anti-leakage sealing stamping forming process according to claim 2, characterized in that: In step 2, the control module also calculates the pressure variance ɑ of the high-strength steel frame area based on the pressure data of each area. 高 and the pressure variance in the middle area of ​​mild steel ɑ 低 ; The control module passes F 高 、F 低 、ɑ 高 and ɑ 低 Calculate the stability coefficient K of mild steel separately 低 =F 低 / ɑ 低 and high strength steel stability factor K 高 =F 高 / ɑ 高 If K 低 and K 高 If the value is not within the corresponding threshold range, it is determined that the pressure in the middle area of ​​the low-carbon steel or the high-strength steel frame area is abnormal, and an alarm is issued while the stamping operation is stopped.

4. The anti-leakage sealing stamping molding process according to claim 1, characterized in that: The process also includes step 6, in which if the control module determines that F 高 If the result of the judgment is no, then go to step 6. Step 6: The stamping process of the skylight frame welded blank is divided into the drawing stage, the bending stage and the shaping stage. After the control module monitors the pressure in each stamping stage, it stores the pressure values ​​in the order of stamping depth and draws a curve F showing the pressure value changing with depth. 拉 (s), F 弯 (s) and F 整 (s), and calculate the net pressure accumulation value of each stamping stage as I 拉 = , I 弯 = and I 整 = ; F 密 is the real-time pressure in the sealed cavity during the same period. The sealed cavity is a closed or semi-closed space formed between the skylight frame and the glass assembly surface. The threshold range (Z1, Z2) of the comprehensive net pressure accumulation detection parameter is pre-entered in the control module. The control module is based on I 拉 , I 弯 and I 整 Calculate the comprehensive net pressure accumulation detection parameter Z=(I 拉 / 0.3+I 弯 / 0.4+I 整 / 0.3) / 3; and when it is determined that Z does not belong to the interval (Z1, Z2), it will enter the pressure accumulation abnormality judgment mode. When it is determined that Z belongs to the interval (Z1, Z2), it will return to step 2.

5. The anti-leakage sealing stamping forming process according to claim 4, characterized in that: The standard net pressure accumulation value I0 during the complete stamping process is pre-entered into the control module, so the judgment mode for abnormal pressure accumulation is: If Z>Z2, and I 拉 When >0.3I0, the control module reduces the stamping speed in the drawing stage by 10%-15%; When Z < Z1 and I 整 <0.3I0, the control module increases the average pressure in the shaping stage by 5% - 8%, reduces the speed in the shaping stage by 4% - 6%, and at the same time extends the pressure holding time in the shaping stage to 0.5 - 1.5 seconds.

6. The anti-leakage sealing stamping forming process according to claim 5, characterized in that: In step 6, the control module calculates the change rate d1=I in the drawing stage, bending stage and shaping stage. 拉 / ds、d2=dI 弯 / ds and d3=dI 整 / ds; When the rate of change is greater than the corresponding threshold, the control module issues an alarm and stops the stamping operation.

7. The anti-leakage sealing stamping forming process according to claim 1, characterized in that: In step 4, when the control module controls the stamping pressure in the middle area of ​​the mild steel to decrease in a gradient, it pauses for 0.5-1 second every time the stamping pressure decreases by 10 kN.

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