Self-adaptive voltage regulation method and system

Abstract

The invention relates to the technical field of stamping dies, in particular to a self-adaptive pressure regulating method and system, and the method realizes a closed loop from monitoring to judgment and regulation to execution of a pressure regulating device, so that a dynamic balance relationship is formed between a material pressing gap and the change of a drawing material receiving line, and the quality of a drawing stamping part is maintained within a qualified range. A drawing receiving line is monitored in an odd number stamping period, a material pressing gap is adjusted in an even number stamping period, and a dynamic balance relation is formed between the material pressing gap and the change of the drawing receiving line, so that the drawing quality of stamping production is stable, the service life of a drawing die is prolonged, and the maintenance frequency of the drawing die is reduced. According to the invention, the technical problem that the material pressing gap of the drawing die can be adaptively adjusted according to the change of a drawing material receiving line in the continuous stamping production process can be solved. The material pressing gap is adjusted in a self-adaptive mode, so that the material pressing pressure is adjusted, the change of a drawing material collecting wire is influenced, it is guaranteed that the drawing material collecting wire is located in a reasonable range, and it is guaranteed that the drawing quality is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping dies, and in particular to an adaptive pressure regulation method and system. Background Art

[0002] The forming process of stamping parts will be affected by changes in the surrounding environment. Due to long-term production, the wear of the convex and concave model surfaces and draw ribs will cause changes in the drawing and receiving line of the stamping die, which will cause quality problems such as necking, cracking, and size changes in the stamping parts. The change of the drawing and receiving line is a small gradual process, and is accompanied by the noise, vibration, temperature and other factors of stamping production. It is not easy to identify and accurately judge, so it is easy to produce unqualified products in drawing production.

[0003] Generally, the change of the drawing receiving line can be achieved by adjusting the gap between the drawing die and the pressing material. In the prior art, the pressing gap is generally adjusted manually by adding a gasket to the pressing ring, which cannot meet the requirements of electric control. Therefore, it cannot realize adaptive adjustment according to the state change of the stamping part or the change of the stamping production process, and the efficiency is low.

[0004] Secondly, the existing method for adjusting the gap between the materials cannot make corresponding improvements to the changes in the surrounding environment, and can only make the state of the drawing die adapt to the changes in the environment, which has poor adaptability and low efficiency.

[0005] In addition, the monitoring of the drawing and receiving line and the adjustment of the pressing gap require opening the mold and completing it when the pressing ring is separated from the upper mold, which is time-consuming and labor-intensive, affecting the efficiency of drawing and stamping. Summary of the invention

[0006] The purpose of the present invention is to provide an adaptive pressure regulating method and system, which can solve the technical problems of poor adaptability and low efficiency of the existing pressing gap adjustment method.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention designs an adaptive voltage regulation method, which includes the following steps:

[0009] Set the standard value of the drawing and receiving line;

[0010] Based on the standard value, set the judgment criteria for the change of the drawing receiving line, as well as the adjustment rules of the monitoring position and the corresponding pressure regulating device;

[0011] Use the visual monitoring unit to measure the dynamic change data of the drawing and receiving line in real time, compare it with the standard value, and give the difference data;

[0012] The monitored change data of the drawing and receiving line is converted into the adjustment signal of each pressure regulating device according to the judgment standard, and the pressing gap of the corresponding position is adjusted in real time;

[0013] Implement a closed loop from monitoring to judgment adjustment and then to the execution of the pressure regulating device, so that the change of the blank holding gap and the drawing take-up line forms a dynamic balance relationship, thereby ensuring that the quality of the drawn stamping parts is maintained within a qualified range.

[0014] As an optimal solution, the adjustment process of the blank holding gap is as follows:

[0015] Set the change adjustment standard line ±T and the shutdown standard line ±S of the drawing take-up line; the visual monitoring unit monitors and calculates the change amount A of the drawing take-up line;

[0016] When A > S or A < -S, the system issues a shutdown command;

[0017] When T < A < S, the judgment control unit issues an instruction to the adjustment execution unit to make an upward adjustment once;

[0018] When -S < A < -T, the judgment control unit issues an instruction to the adjustment execution unit to make a downward adjustment once;

[0019] When -T ≤ A ≤ T, it is the boundary of the qualified drawn sheet metal, and the system does not make adjustments.

[0020] As an optimal solution, the relationship and adjustment principle between the system monitoring position and the adjustment position are as follows:

[0021] When the monitoring position is the same as the adjustment position, and the monitoring position gives an adjustment instruction, then directly give an adjustment instruction to the adjustment mechanism at the corresponding position;

[0022] When the monitoring position is between two adjustment positions, and the monitoring position gives an adjustment instruction, then give adjustment instructions to the adjustment mechanisms on both sides of the monitoring position.

[0023] As an optimal solution, the monitoring of the drawing take-up line and the adjustment of the blank holding gap are completed in different stamping cycles. The drawing take-up line is monitored in odd stamping cycles, and the blank holding gap is adjusted in even stamping cycles. The two are carried out alternately, so that each functional module has sufficient time to complete.

[0024] Furthermore, when the system is in an odd stamping cycle, the visual monitoring unit conducts visual monitoring. The monitoring period is the upper dead point of the press ±30°. Monitoring starts from -30° and ends at +30°. And the data of each monitoring point are transmitted to the logic control unit. The logic control unit receives the monitoring data and performs the drawing work for this stamping cycle according to the monitoring data.

[0025] Furthermore, when the system is in an even-numbered stamping cycle, the logic control unit sends a press gap adjustment instruction to each pressure regulating device to complete the adjustment action; the adjustment period is the ±90° period of the press's working top dead center, starting from -90° and ending at +90°; after the press gap adjustment is completed, the drawing work of this stamping cycle is carried out.

[0026] As a preferred solution, the relationship between the pressing gap and the drawing and receiving line is as follows:

[0027] At the position where the gap between the pressing materials is large, the pressure on the drawn sheet is small, the flow speed of the drawn sheet is fast, and the drawing receiving line is more inward;

[0028] At the position where the pressing gap is small, the drawn sheet is under great pressure, the flow speed of the drawn sheet is slow, and the drawing collection line is less retracted.

[0029] The present invention also designs an adaptive voltage regulation system, comprising the following units:

[0030] Visual monitoring unit: set the standard value of the drawing receiving line, take pictures with a camera, analyze and fit the actual shrinkage line of the drawn part, and give the difference by comparing it with the standard value of the drawing receiving line;

[0031] Logical control unit: Set the judgment criteria for the change of the drawing receiving line based on the standard value, as well as the adjustment rules for the monitoring position and the corresponding voltage regulating device; analyze the monitored data, convert the monitored change data of the drawing receiving line into the adjustment signal of each voltage regulating device according to the judgment criteria, and give the adjustment instructions of each control unit according to the analysis results;

[0032] Adjustment mechanism unit: Execute adjustment actions according to adjustment instructions to adjust the gap between the pressing surface of the pressing ring and the die, optimize the pressure state of the pressing surface, and realize the adaptive pressure regulation function. From monitoring to judgment and adjustment, and then to the closed loop executed by the pressure regulating device, the change of the pressing gap and the drawing and receiving line forms a dynamic balance relationship, thereby ensuring that the quality of the drawn stamping parts is maintained within an acceptable range.

[0033] Beneficial effects of the present invention:

[0034] The present invention relates to an adaptive pressure adjustment method and system, which can solve the technical problem of enabling the pressing gap of the drawing die to be adaptively adjusted according to the change of the drawing receiving line in the continuous stamping production process, and has high adaptability and efficiency. By adaptively adjusting the pressing gap, the pressing pressure is adjusted to affect the change of the drawing receiving line, ensuring that the drawing receiving line is within a reasonable range and ensuring stable drawing quality.

[0035] (1) The pressing gap adjustment mechanism can realize electric control, and at the same time realize digital monitoring of the state of the drawing and receiving line, so that drawing and stamping can achieve intelligent production.

[0036] (2) Monitor the drawing receiving line during odd-numbered stamping cycles and adjust the pressing gap during even-numbered stamping cycles. The two are performed alternately. The changes in the pressing gap and the drawing receiving line form a dynamic equilibrium relationship, which stabilizes the quality of stamping production and drawing, increases the service life of the drawing die, and reduces the number of maintenance times for the drawing die.

[0037] (3) The pressure regulating device is easier to adjust and can be adjusted without opening the mold. The adjustment cycle is short and the response speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of the present invention.

[0039] Figure 2 It is a functional schematic diagram of the present invention.

[0040] Figure 3 It is a schematic diagram of the state change of the drawing and receiving line of the present invention.

[0041] Figure 4 This is a corresponding relationship diagram between the monitoring position and the adjustment position of the present invention.

[0042] Figure 5 This is a schematic diagram of the layout of the voltage regulating device of the present invention.

[0043] Figure 6 This is a schematic diagram of an odd-numbered stamping cycle of the present invention.

[0044] Figure 7 It is a schematic diagram of an even-numbered stamping cycle of the present invention. DETAILED DESCRIPTION

[0045] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0046] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The present invention relates to an adaptive pressure regulation method and system, which is used in an automobile stamping production line, and is an intelligent adaptive pressure regulation device for adjusting the state of a drawing press, and a system method capable of ensuring the quality of a drawn part is qualified and stable. The present invention can solve the technical problem of enabling the press gap of a drawing die to be adaptively adjusted according to the change of a drawing receiving line during a continuous stamping production process, and by adaptively adjusting the press gap, the press pressure is adjusted to affect the change of the drawing receiving line, ensuring that the drawing receiving line is within a reasonable range, and ensuring the stable drawing quality.

[0049] The pressing gap refers to the gap between the pressing surface of the pressing ring and the die. The pressure regulating device is a device that adjusts the pressure between the pressing surface of the die and the drawn part by adjusting the pressing gap. In batch production, the drawing pressing state can be adjusted adaptively to ensure the quality of the drawn parts is qualified and stable.

[0050] During drawing, the pressure adjustment between the pressing surface and the drawn part can determine the flow speed of the drawn sheet, thereby determining the change of the drawing receiving line. The change of the drawing receiving line in turn prompts the adaptive adjustment of the pressing gap of the drawing die.

[0051] The present invention provides an adaptive voltage regulation method, such as Figure 1 As shown, the following steps are included:

[0052] 1) Set the drawing receiving line after the mold is accepted and debugged as the standard value;

[0053] 2) Set the judgment criteria for the change of the drawing and receiving line (including adjustment criteria and shutdown criteria), set the adjustment rules of the monitoring position and the corresponding voltage regulating device, and make manual adjustments based on the production site data experience;

[0054] 3) Use the visual monitoring unit to measure the dynamic change data of the drawing and receiving line in real time, compare it with the standard value, and give the difference data;

[0055] Function of the monitoring device: Detect the position of the receiving line of the stamping parts, and give the difference status between the receiving line and the standard position. If the status is within the qualified range, it ends without sending a signal to the control system; if it exceeds the qualified range, the measured value is sent to the control system, or the control system is directly instructed.

[0056] Monitoring device description:

[0057] A-Receiving line monitoring equipment is a standardized product, which uses optical imaging to cooperate with the running signal of the stamping machine to take pictures and detect the receiving line of the stamped products;

[0058] B-Based on the limitation of detection extension accuracy, the field of view of the camera is about 2500mm*2000mm;

[0059] C-The receiving line monitoring equipment can monitor the extension of the material edge. If the extension is less than 3mm, no adjustment is made. If the extension is 3-8mm, the system will give instructions to adjust the pressing force. If the extension is >8mm, an alarm will be triggered and the stamping machine will stop. The extension warning can be set manually, and the corresponding extension size alarm can be set according to different products.

[0060] D-The bottom dead point IO signal of the punching machine PLC needs to be provided to ensure that the signal is stable and reliable.

[0061] 4) Convert the monitored drawing and receiving line data into adjustment signals of each pressure regulating device according to the judgment criteria, and adjust the pressing gap at the corresponding position; the specific steps are as follows:

[0062] After the monitoring system receives the mold change signal from the press, it updates the monitoring interface and the monitoring camera group adjusts the camera angle according to different products;

[0063] For single-piece drawing and stamping, the monitoring system receives the stamping IO signal to trigger the camera to take a photo, and the monitoring system stores the standard drawing; the inspection positions of the standard drawing are manually calibrated, numbered and saved; the mold pressure regulating pad positions are manually calibrated, numbered and saved; the drawing receiving line change judgment standard (adjustment standard and shutdown standard) is set; the corresponding pressure regulating pad rules are set for each inspection position exceeding the standard.

[0064] During continuous drawing and stamping, the monitoring system continues to receive the stamping I0 signal to trigger the camera to take pictures and start monitoring; the algorithm identifies the changes in the receiving line after each picture is taken; it determines whether each detection position exceeds the standard. If so, the shutdown standard is reached and the system alarms and shuts down; if not, the visual monitoring system is given a pressure adjustment instruction for the corresponding mold pressure regulating pad according to the adjustment standard; the servo PLC receives the instruction and converts it into motor control; if the instruction is zero, the motor does not rotate; if the instruction is positive, the motor rotates forward one unit; if the instruction is negative, the motor rotates forward one unit; each pressure regulating pad completes the corresponding adjustment.

[0065] At the position where the pressing gap is large, the drawn sheet is under less pressure, the drawn sheet flows faster, and the drawing collection line is more inward.

[0066] At the position where the pressing gap is small, the drawn sheet is under great pressure, the flow speed of the drawn sheet is slow, and the drawing collection line is less retracted.

[0067] 5) The clamping gap is adjusted in real time through the changes of the drawing receiving line, forming a closed loop from monitoring to judgment and adjustment, and then to the execution of the pressure regulating device; this closed loop forms a dynamic equilibrium relationship between the clamping gap and the changes of the drawing receiving line as the stamping production continues, thereby eliminating the influence of the surrounding environment changes on the drawing quality;

[0068] 6) The monitoring of the drawing and receiving line and the adjustment of the pressing gap are respectively carried out in different stamping cycles, so that each functional module has sufficient time to complete.

[0069] It should be understood that the specific order or hierarchy of steps in the process disclosed by the present invention is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims provide the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0070] The stamping cycle refers to the time required from the start of one stamping to the start of the next stamping, which is usually divided into rising time, falling time, and dwell time. The stamping cycle includes odd-numbered stamping cycles and even-numbered stamping cycles.

[0071] The odd-numbered stamping cycle reflects the stamping cycle in which the monitoring process of the drawing and receiving line is located. The monitoring of the drawing and receiving line is recorded by shooting the parts after drawing with a camera. When the camera shoots, the mold must be in the open state. The shooting drawing data must be calculated and analyzed to obtain the actual drawing sheet line.

[0072] The even-numbered stamping cycle reflects the stamping cycle in which the pressure gap adjustment process is located. When the pressure gap is adjusted, the adjustment mechanism cannot be subjected to force, otherwise the adjustment mechanism cannot be adjusted.

[0073] Due to the conditions of monitoring the drawing receiving line and adjusting the pressing gap, the monitoring and adjustment cannot be completed in one stamping cycle. Therefore, they must be completed in different stamping cycles respectively. The monitoring of the drawing receiving line is performed in odd-numbered stamping cycles, and the pressing gap is adjusted in even-numbered stamping cycles. The two are performed alternately.

[0074] The press gap adjustment process of the present invention is as follows:

[0075] 1. Set the drawing and receiving line change adjustment standard line ±T and the shutdown standard line ±S (see Figure 3 ); the visual monitoring unit monitors and calculates the change A of the drawing and receiving line, such as Figure 3 Indicated by the dashed line;

[0076] 2. When A > S or A < -S, the system issues a shutdown instruction;

[0077] 3. When T < A < S, the judgment control unit issues an instruction to the adjustment execution unit to make an upward adjustment once;

[0078] 4. When -S < A < -T, the judgment control unit issues an instruction to the adjustment execution unit to make a downward adjustment once;

[0079] 5. When -T ≤ A ≤ T, it is the boundary of the qualified drawn blank, and the system makes no adjustment.

[0080] In this embodiment, each time the adjustment execution unit receives an adjustment instruction, the blank holding gap is adjusted by 0.01 mm.

[0081] The relationship between the system monitoring position and the adjustment position and the adjustment principle are as follows:

[0082] 1. For the positions with blank holding gap monitoring, adjustment mechanisms need to be set around (as Figure 4 shown);

[0083] 2. The relationship between the monitoring position and the adjustment position and the adjustment principle are as follows:

[0084] A. The monitoring position is the same as the adjustment position: The monitoring position is on the side of the adjustment position. When the monitoring position gives an adjustment instruction, an adjustment instruction is made to the adjustment mechanism at the corresponding position;

[0085] B. The monitoring position is between two adjustment positions: In this case, when the monitoring position gives an adjustment instruction, adjustment instructions are made to the adjustment mechanisms on both sides of the monitoring position.

[0086] The structure of the blank holding gap adjustment unit of the present invention is as Figure 5 shown:

[0087] This adjustment mechanism is driven by a servo motor, and the height of the main block is adjusted with high precision through a wedge structure to realize the adjustment of the gap between the upper and lower blank holding surfaces, achieving the purpose of adjusting the blank holding gap and ensuring the quality of the drawn part.

[0088] Visual monitoring system: By taking pictures with a camera, the algorithm identifies the change of the receiving line after each picture taking, and gives a judgment result according to the judgment standard, and issues an adjustment instruction for adjusting the cushion block;

[0089] Motor control system: Set the motor adjustment unit and issue control instructions to the motors of each adjustment cushion block

[0090] Pressure regulating device (execution unit): Execute the adjustment instruction, complete the adaptive adjustment of the cushion block height, and realize the adjustment of the blank holding force distribution. The detection device detects the state of the drawn receiving line, and automatically adjusts the drawn blank holding force through the pressure regulating device.

[0091] The pressure regulating device consists of two parts: the motor and the mechanical part. The motor part can receive the adjustment instructions of the monitoring space-time system and make adjustments. The mechanical part uses the principle of the wedge to change the position of the servo motor and the main block to ensure that the installation height of the pad is small and the mold used can be arranged with support ribs under the installation surface. The function of the pressure regulating device: During the mold adjustment and production stage, the local gap between the upper die and the blank holder can be adjusted without removing the pad. In the debugging stage: the drive in the adaptive pad (connected to the motor) is in the retracted state, the motor is not powered, and the height of the pressure regulating device can be adjusted by adjusting the screw instead of adding a shim under the pad to adjust the height. In the production stage: the motor of the pressure regulating device receives the instructions of the control system, adjusts once according to the instructions, and makes corresponding adjustments to the drawing pressing force. Pressure regulating principle: the motor drives the entire assembly to make the main block rise and fall, and the regulating device moves once to adjust 0.01mm. The number of rises and falls is given by the control system.

[0092] The monitoring of the drawing and receiving line and the adjustment of the pressing gap are completed in different stamping cycles. The monitoring of the drawing and receiving line is performed in odd-numbered stamping cycles, and the adjustment of the pressing gap is performed in even-numbered stamping cycles. The two are performed alternately so that each functional module has sufficient time to complete. The workflow of the two stamping cycles of the present invention is as follows: Figure 6 , 7 As shown:

[0093] During odd-numbered stamping, the drawing and receiving line is monitored, and the system device performs visual monitoring. The monitoring period is ±30° from the top dead center of the press. Monitoring starts at -30° and ends at +30°. The data of each monitoring point is transmitted to the logic control unit, which receives the monitoring data. After the monitoring, the drawing work of this stamping cycle is completed.

[0094] During even-numbered stamping, the press gap is adjusted. The system device logic control unit sends a press gap adjustment instruction to each pressure regulating device according to the adjustment method to complete the adjustment action. The adjustment period is the ±90° period of the press working top dead center, starting from -90° and ending at +90°. After the adjustment is completed, the drawing work of this stamping cycle is completed.

[0095] The next stamping is an odd-numbered stamping, and visual monitoring is performed again, and the above work is repeated in a cycle. Through the above "drawing stamping-drawing receiving line monitoring-drawing stamping-pressing gap adjustment-drawing stamping" cycle, when the drawn parts show a trend of unqualified, that is, the change of the drawing receiving line exceeds the standard range, the press gap is slightly adjusted to suppress the unqualified trend of the drawing stamping process, so that the change of the drawing receiving line returns to the standard range, thereby ensuring that the quality of the drawn stamping parts is maintained within a qualified range.

[0096] The present invention also provides an adaptive voltage regulation system, comprising the following units:

[0097] Visual monitoring unit: set the standard value of the drawing receiving line, take pictures with a camera, analyze and fit the actual shrinkage line of the drawn part, and give the difference by comparing it with the standard value of the drawing receiving line;

[0098] Logical control unit: Set the judgment criteria for the change of the drawing receiving line based on the standard value, as well as the adjustment rules for the monitoring position and the corresponding voltage regulating device; analyze the monitored data, convert the monitored change data of the drawing receiving line into the adjustment signal of each voltage regulating device according to the judgment criteria, and give the adjustment instruction of each control unit according to the analysis results; the logical control unit controls each adjustment instruction, and the unit adjustment amount of the adjustment mechanism is 0.01mm.

[0099] Adjustment mechanism unit: Execute adjustment actions according to adjustment instructions to adjust the gap between the pressing surface of the pressing ring and the die, optimize the pressure state of the pressing surface, and realize the adaptive pressure regulation function. From monitoring to judgment and adjustment, and then to the closed loop executed by the pressure regulating device, the change of the pressing gap and the drawing and receiving line forms a dynamic balance relationship, thereby ensuring that the quality of the drawn stamping parts is maintained within an acceptable range.

[0100] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An adaptive voltage regulation method, characterized in that: It includes the following steps: Set the standard value of the drawing blank holding line; Based on the standard value, set the judgment criteria for the change of the drawing blank holding line, as well as the adjustment rules for the monitoring position and the corresponding pressure regulating device; Use the visual monitoring unit to measure the dynamic change data of the drawing blank holding line in real time, compare it with the standard value, and give the difference data; Convert the monitored change data of the drawing blank holding line into adjustment signals for each pressure regulating device according to the judgment criteria, and adjust the blank holding gap at the corresponding position in real time; Realize the closed loop from monitoring to judgment and adjustment, and then to the execution of the pressure regulating device, so that the blank holding gap and the change of the drawing blank holding line form a dynamic balance relationship, thereby ensuring that the quality of the drawn stamping parts is maintained within a qualified range.

2. The adaptive voltage regulation method according to claim 1, characterized in that: The adjustment process of the blank holding gap is as follows: Set the change adjustment standard line ±T and the shutdown standard line ±S of the drawing blank holding line; the visual monitoring unit monitors and calculates the change amount A of the drawing blank holding line; When A > S or A < -S, the system issues a shutdown command; When T < A < S, the judgment control unit issues an instruction to the adjustment execution unit to make an upward adjustment once; When -S < A < -T, the judgment control unit issues an instruction to the adjustment execution unit to make a downward adjustment once; When -T ≤ A ≤ T, it is the boundary of the qualified drawn sheet metal, and the system does not make adjustments.

3. The adaptive voltage regulation method according to claim 2, characterized in that: The relationship between the system monitoring position and the adjustment position and the adjustment principle is as follows: When the monitoring position is the same as the adjustment position and the monitoring position gives an adjustment instruction, directly give an adjustment instruction to the adjustment mechanism at the corresponding position; When the monitoring position is between two adjustment positions and the monitoring position gives an adjustment instruction, give adjustment instructions to the adjustment mechanisms on both sides of the monitoring position.

4. The adaptive voltage regulation method according to claim 3, characterized in that: The monitoring of the drawing blank holding line and the adjustment of the blank holding gap are completed in different stamping cycles. The drawing blank holding line is monitored in odd stamping cycles, and the blank holding gap is adjusted in even stamping cycles. The two are carried out alternately to allow sufficient time for each functional module to complete.

5. The adaptive voltage regulation method according to claim 4, characterized in that: When the system is in an odd stamping cycle, the visual monitoring unit conducts visual monitoring. The monitoring period is the top dead center of the press ±30°. Monitoring starts from -30° and ends at +30°. The data of each monitoring point is transmitted to the logic control unit. The logic control unit receives the monitoring data and performs the drawing work for this stamping cycle according to the monitoring data.

6. The adaptive voltage regulation method according to claim 4, characterized in that: When the system is in an even stamping cycle, the logic control unit issues an instruction to adjust the blank holding gap to each pressure regulating device to complete the adjustment action; the adjustment period is the top dead center of the press ±90°. Adjustment starts from -90° and ends at +90°; after the blank holding gap adjustment is completed, the drawing work for this stamping cycle is carried out again.

7. The adaptive voltage regulation method according to any one of claims 1 to 6, characterized in that: The relationship between the blank holding gap and the change of the drawing blank holding line is as follows: At the position with a large blank holding gap, the drawn sheet metal is less受压, the flow rate of the drawn sheet metal is fast, and the drawing blank holding line retracts more; At the position with a small blank holding gap, the drawn sheet metal is more受压, the flow rate of the drawn sheet metal is slow, and the drawing blank holding line retracts less.

8. An adaptive voltage regulation system, characterized in that: It includes the following units: Visual monitoring unit: Set the standard value of the drawing blank holding line, take pictures through the camera, analyze the data and fit the actual shrinkage line of the sheet metal of the drawn part, and give the difference by comparing with the standard value of the drawing blank holding line; Logical control unit: Set the judgment criteria for the change of the drawing receiving line based on the standard value, as well as the adjustment rules for the monitoring position and the corresponding voltage regulating device; analyze the monitored data, convert the monitored change data of the drawing receiving line into the adjustment signal of each voltage regulating device according to the judgment criteria, and give the adjustment instructions of each control unit according to the analysis results; Adjustment mechanism unit: Execute adjustment actions according to adjustment instructions to adjust the gap between the pressing surface of the pressing ring and the die, optimize the pressure state of the pressing surface, and realize the adaptive pressure regulation function. From monitoring to judgment and adjustment, and then to the closed loop executed by the pressure regulating device, the change of the pressing gap and the drawing and receiving line forms a dynamic balance relationship, thereby ensuring that the quality of the drawn stamping parts is maintained within an acceptable range.

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