A system and method for automatically controlling welding distortion

Abstract

The application discloses a system and method for automatically controlling welding deformation, which comprises the following post-welding straightening steps: performing post-welding straightening control of a workpiece based on a preset straightening amount threshold value, and collecting a current straightening deformation variable of the workpiece in the control process; taking the fact that the current workpiece after the post-welding straightening control meets accuracy requirements as a judgment condition, calculating and determining a current straightening amount according to the current straightening deformation variable, and updating the straightening amount threshold value with the current straightening amount. The scheme is based on product structure process and welding deformation trend analysis, positioning strategy formulation, and pre-deformation / straightening implementation scheme, and has the advantages of efficient and rapid processing, and wide application in product batch production processes on the basis of ensuring product accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding process, in particular to a system and method for automatically controlling welding deformation. BACKGROUND

[0002] It is known that when a workpiece is subjected to a non-uniform temperature field during welding, shape and size changes, i.e. welding deformation, will occur. Changes that occur with temperature changes are referred to as welding instantaneous deformation, and changes when the welded workpiece is completely cooled to the initial temperature are referred to as welding residual deformation.

[0003] In existing welding processes, intervention control is usually performed on welding deformation to avoid excessive welding deformation affecting product yield. Based on the existing welding deformation control method, welding deformation control is mostly based on experience to set welding pre-deformation and implement post-weld straightening. However, there are many factors affecting welding deformation in mass production, such as changes in raw material composition, stability of stamped parts, fluctuations in welding process, fluctuations in power grid voltage, stability of welding equipment, etc., which can cause inconsistent / stable welding deformation. At present, the welding deformation control method based on welding experience values cannot meet the stability of batch product quality, especially in severe cases, which can cause production adjustment and greatly increase the repair cost.

[0004] Therefore, it is urgent to optimize welding deformation in another way to improve the yield of batch production. SUMMARY

[0005] To solve the above technical problems, the present application provides a system and method for automatically controlling welding deformation, which can be efficiently and quickly applied to the batch production process of products.

[0006] The method for automatically controlling welding deformation provided by the present application includes the following post-weld straightening steps:

[0007] Performing post-weld straightening control of the workpiece based on a preset straightening amount threshold, and collecting the current straightening deformation variable of the workpiece in the control process;

[0008] Taking the current workpiece satisfying the accuracy requirement after post-weld straightening control as a judgment condition, calculating and determining the current straightening amount according to the current straightening deformation variable, and updating the straightening amount threshold with the current straightening amount.

[0009] Preferably, the calculation and determination of the current straightening amount according to the current straightening deformation variable comprises:

[0010] Determining the straightening parameter and the first functional relationship between the straightening parameter and the sample data from a plurality of straightening experiments; wherein the sample data includes straightening deformation variable and straightening amount.

[0011] According to the current orthopaedic deformation variable and the first function relationship, the current orthopaedic variable is calculated.

[0012] Preferably, the preset orthopaedic variable threshold is determined by sample data obtained from multiple orthopaedic experiments.

[0013] Preferably, the pre-welding pre-deformation step further comprises:

[0014] The pre-welding pre-deformation control of the workpiece is performed based on the preset pre-deformation variable threshold, and the current pre-deformation deformation variable of the workpiece in the control process is collected;

[0015] The current workpiece after the post-welding orthopaedic control meets the accuracy requirement as a judgment condition, and the current pre-deformation variable is calculated according to the current pre-deformation deformation variable, and the pre-deformation variable threshold is updated according to the current pre-deformation variable.

[0016] Preferably, the current pre-deformation variable is calculated according to the current pre-deformation deformation variable, comprising:

[0017] The pre-deformation parameters and the second function relationship between the pre-deformation parameters and the sample data are determined by sample data obtained from multiple orthopaedic experiments; wherein the sample data further comprises pre-deformation deformation variable and pre-deformation variable;

[0018] According to the current pre-deformation deformation variable and the second function relationship, the current pre-deformation variable is calculated.

[0019] Preferably, the current workpiece after the post-welding orthopaedic control does not meet the accuracy requirement as a judgment condition, the orthopaedic variable output by the clamping execution mechanism is adjusted, and the corresponding current orthopaedic deformation variable is collected again until the current workpiece after the post-welding orthopaedic control meets the accuracy requirement.

[0020] Preferably, before the control of the post-welding orthopaedic of the workpiece is performed, or before the control of the pre-welding pre-deformation of the workpiece is performed, the clamping execution mechanism is self-checked.

[0021] The application also provides an automatic control system for welding deformation, comprising: a clamping execution mechanism for outputting post-welding orthopaedic force to a tooling fixture; a storage unit for storing a preset orthopaedic variable threshold; an acquisition unit for collecting the current orthopaedic deformation variable of the workpiece in the control process; a control unit for outputting control instructions to the control end of the clamping execution mechanism according to the preset orthopaedic variable threshold; the control unit further takes the current workpiece after the post-welding orthopaedic control meeting the accuracy requirement as a judgment condition, calculates the current orthopaedic variable according to the current orthopaedic deformation variable, and updates the orthopaedic variable threshold according to the current orthopaedic variable.

[0022] Preferably, the clamping actuating mechanism is further configured to output a pre-welding pre-deformation force to the tooling fixture, the storage unit is further configured to store a preset pre-deformation threshold, the acquisition unit is further configured to acquire a current pre-deformation deformation amount of the workpiece in the control process, and the control unit is further configured to output a control instruction to a control end of the clamping actuating mechanism according to the preset pre-deformation threshold; the control unit further takes the current workpiece satisfying the accuracy requirement after the post-welding straightening control as a judgment condition, calculates a current pre-deformation amount according to the current pre-deformation deformation amount, and updates the pre-deformation threshold according to the current pre-deformation amount.

[0023] Preferably, the clamping actuating mechanism is arranged on a tooling base, and a scale for observing the deformation amount is arranged on the tooling base.

[0024] Preferably, the clamping actuating mechanism comprises a servo driving component, a clamping mechanism and a clamping cylinder, the clamping mechanism and the clamping cylinder are respectively arranged on two sides of the workpiece to be processed, the clamping mechanism is configured to limit the deformable amount of the workpiece to be processed, the clamping cylinder is configured to output a clamping force to the tooling fixture according to the control instruction, and the servo driving component is configured to drive the clamping mechanism to adjust the working position according to the control instruction.

[0025] Preferably, the acquisition unit is specifically a displacement sensor.

[0026] For the existing welding process, the present application innovatively proposes a method capable of automatically controlling welding deformation. Specifically, the post-welding straightening control of the workpiece is performed based on a preset straightening threshold, and the corresponding straightening operation is realized in combination with the tooling fixture. When the current workpiece satisfies the accuracy requirement after straightening, the current straightening amount is determined according to the acquired current straightening deformation amount, and the straightening threshold is updated. In this way, on the one hand, the straightening work that cannot be solved in the welding of complex parts is solved, and the straightening, verification and threshold correction can be efficiently and quickly performed by utilizing the product batch production process. In addition, the straightening threshold updated after further fitting and correction can minimize the influence caused by welding deformation, thereby providing a good technical guarantee for improving the size accuracy of key installation of the workpiece and the overall size qualification rate. At the same time, the influence of human factors can be reduced, and the stability of the tooling / equipment is further improved.

[0027] In the preferred scheme of the present application, a corresponding control means is additionally arranged for pre-welding pre-deformation. The pre-welding pre-deformation control of the workpiece is performed based on a preset pre-deformation threshold, and the corresponding pre-deformation operation is realized in combination with the tooling fixture. Similarly, when the current workpiece satisfies the accuracy requirement, the current pre-deformation amount is determined according to the acquired current pre-deformation deformation amount, and the pre-deformation amount threshold is updated. Overall, in the pre-welding pre-deformation and post-welding straightening two stages, the corresponding automatic control can be accurately realized. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The overall structure of the frame rail is shown in the specific embodiment.

[0029] Figure 2 The main welding deformation direction of the frame rail is shown. Figure 1 The main welding deformation direction of the frame rail is shown.

[0030] Figure 3 The jig for automatically controlling the welding deformation is shown in the specific embodiment.

[0031] Figure 4 The A view of Figure 3 The A view of

[0032] Figure 5 The method flow chart for automatically controlling the welding deformation is shown in Example 1.

[0033] Figure 6 The method flow chart for automatically controlling the welding deformation is shown in Example 2.

[0034] Figure 7 The system principle block diagram for automatically controlling the welding deformation is shown in Example 3.

[0035] In the figure:

[0036] Jig base 1, servo drive component 2, scale 3, displacement sensor 4, clamping cylinder 5, clamping mechanism 6, front end positioning mechanism of the frame rail 7, rear end positioning mechanism of the frame rail 8, frame rail 9.

[0037] Clamping execution mechanism 71, storage unit 72, acquisition unit 73, control unit 74. DETAILED DESCRIPTION

[0038] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0039] Without loss of generality, the frame rail (left) shown in the figure is taken as the description object in the present embodiment, and the specific scheme for automatically controlling the welding deformation is described in detail. It should be understood that the structure size and the like of different workpieces to be welded are determined according to the self-function design, and are not the contribution of the present application to the prior art, so the corresponding scheme of the automatically controlled welding deformation claimed by the present application does not constitute a substantial limitation.

[0040] Please refer to Figure 1 and Figure 2 , wherein the figure shows the overall structure of the frame rail according to the present embodiment, Figure 2The direction of the main welding deformation of the frame rail is shown. That is, the welding deformation in the direction of the figure +F is determined according to production experience, which is the main control direction of the straightening.

[0041] Please see Figure 3 and Figure 4 wherein, Figure 3 is a schematic diagram of the tooling for automatically controlling welding deformation described in the specific embodiment, Figure 4 is Figure 3 A view of.

[0042] It should be noted that the positioning of the parts of the tooling, the straightening position needs to be designed according to the structure of the product, the process, the welding deformation and so on, for example but not limited to the preferred example based on the frame rail in the figure. The tooling includes a tooling base 1, a servo drive part 2, a scale 3, a displacement sensor 4, a clamping cylinder 5, a clamping mechanism 6, a front end positioning mechanism 7 of the rail and a rear end positioning mechanism 8 of the rail; wherein the frame rail 9 to be processed is placed in the tooling clamp, and can be respectively positioned and fixed by the front end positioning mechanism 7 of the rail and the rear end positioning mechanism 8 of the rail. And on this basis, the corresponding straightening operation is performed.

[0043] The tooling is shown in combination with the data calculation and analysis system to form an automatic control welding deformation system.

[0044] Example one:

[0045] Please see Figure 5 , which shows the method flowchart of the automatic control welding deformation described in this embodiment. The working process of the automatic control method is as follows:

[0046] S01. For the product to be straightened, select the initial pre-shape variable and the straightening amount threshold.

[0047] Wherein, the product to be straightened refers to the vehicle type and the specific product to be welded of the vehicle type, which is the workpiece (frame rail) in this scheme, which can be determined by HMI (human-machine interface) and the initial pre-shape variable and the straightening amount threshold are selected. It should be understood that the straightening amount threshold is usually greater than the theoretical value, and after straightening and loosening the clamping, the workpiece rebounds and basically returns to the theoretical size.

[0048] S02. Self-checking.

[0049] Before performing the corresponding straightening operation, check whether each clamping mechanism has been opened and whether each servo drive part has returned to the work origin.

[0050] S03. Clamping the workpiece.

[0051] Place the frame rail on the tooling and clamp it after positioning.

[0052] S51. Perform the control of the post-weld straightening of the workpiece based on the preset threshold of the straightening amount.

[0053] The threshold of the straightening amount of each part is called from the database according to the vehicle type / product, and the servo driving part is controlled to straighten and hold the post-weld frame rail. Here, for the pre-weld deformation and post-weld straightening treatment of the workpiece to be processed, the selection of the specific treatment part can be determined according to different vehicle types / products.

[0054] S52. Data acquisition.

[0055] The current straightening deformation of the workpiece in the control process is collected for precision judgment, calculation of the straightening amount, fitting, and further improvement of the straightening database.

[0056] S53. Precision judgment.

[0057] Based on the product design requirements of the frame rail, the current workpiece after post-weld straightening control is determined to meet the precision requirements as the judgment condition, and it is confirmed whether the current workpiece is a qualified product. If yes, step S54 is executed; if no, step S55 is executed.

[0058] S54. Calculate the current straightening amount and update the database.

[0059] The current straightening amount is calculated according to the collected current straightening deformation, and the straightening amount threshold of the frame rail is updated with the current straightening amount.

[0060] That is, after straightening, it is necessary to detect whether the final frame rail reaches the precision standard. If it reaches the standard, the data is recorded and stored in the database as the basis data for the next call. If it cannot reach the standard, step S55 is executed.

[0061] S55. Adjust the straightening amount output by the clamping execution mechanism and repeat steps S51-S53.

[0062] Here, the "adjustment of the straightening amount output by the clamping execution mechanism" includes increasing or decreasing the straightening amount to adjust the straightening data, and collecting the corresponding current straightening deformation again until the current workpiece after post-weld straightening control meets the precision requirements, records the data, and is used to update the mathematical model.

[0063] It should be noted that the threshold and calculation model stored in the data storage unit in the present scheme are determined based on the correction experiment. During the correction debugging process, the displacement sensor 4 on the tooling continuously collects the deformation data of each frame rail 9, and through a certain number of correction experiments, for example but not limited to, a distribution algorithm is used.

[0064] Specifically, the calculation of the current straightening amount based on the current straightening deformation includes:

[0065] Determine the correction parameters and the first function relationship between the correction parameters and the sample data obtained from multiple correction experiments, wherein the sample data includes a correction deformation variable and a correction amount; and calculate the current correction amount according to the current correction deformation variable and the first function relationship.

[0066] Meanwhile, the preset correction amount threshold is also determined based on sample data obtained from multiple correction experiments. In this scheme, the initial correction parameters are obtained from correction experiments. A mathematical model is established using the initial data to obtain a function curve of the deformation variable and the correction parameter. In the subsequent production process, the data collected is substituted into the function to obtain the required correction amount data. That is, the system starts with a set of empirical values, and the subsequent correction amount threshold data is the optimal value after continuous fitting of the system.

[0067] This embodiment realizes the automatic control of the product to be corrected after welding, and can further add the automatic control of the pre-deformation before welding, which will be described in detail in the following implementation.

[0068] Embodiment Two:

[0069] Please refer to Figure 6 The figure shows the flow chart of the automatic control method of the welding deformation according to the embodiment. The working process of the automatic control method is as follows:

[0070] S01. Select the initial pre-deformation variable and the correction amount threshold for the product to be corrected.

[0071] The product to be corrected refers to the vehicle type and the specific product to be welded of the vehicle type, which is the workpiece (vehicle frame longitudinal beam) in this scheme. The initial pre-deformation variable and the correction amount threshold can be determined through HMI (human-machine interface). It should be understood that the correction amount threshold is usually greater than the theoretical value. After correction and release of clamping, the workpiece rebounds and basically returns to the theoretical size.

[0072] S02. Self-checking.

[0073] Before performing the corresponding correction operation, check whether each clamping mechanism has been opened and whether each servo drive component has returned to the working origin.

[0074] S03. Clamping the workpiece.

[0075] Place the vehicle frame longitudinal beam on the tooling, position it, and clamp it.

[0076] S61. Perform control of pre-deformation of the workpiece before welding based on the preset pre-deformation amount threshold.

[0077] According to the vehicle type / product, call the pre-deformation amount threshold of each part from the database to control the servo drive component to pre-deform the vehicle frame longitudinal beam to be welded.

[0078] S62. Welding processing, and holding.

[0079] S63. Data acquisition.

[0080] The current pre-deformation deformation of the workpiece in the control process is acquired for precision judgment, pre-deformation calculation and fitting, and further improvement of the pre-deformation database.

[0081] S64. Control of post-weld straightening of the workpiece based on the preset straightening amount threshold.

[0082] The straightening amount of each part is called from the database according to the vehicle type / product, and the servo driving part is controlled to straighten the post-weld frame side member and hold.

[0083] S65. Data acquisition.

[0084] The current straightening deformation of the workpiece in the control process is acquired for precision judgment, straightening amount calculation and fitting, and further improvement of the straightening database.

[0085] S66. Precision judgment.

[0086] Based on the product design requirements of the frame side member, the current workpiece after post-weld straightening control is judged to meet the precision requirements, and it is determined whether the current workpiece is a qualified product. If yes, step S67 is executed; if no, step S68 is executed.

[0087] S67. Calculate the current straightening amount and update the database.

[0088] The current straightening amount is calculated according to the acquired current straightening deformation, and the current pre-deformation amount is calculated according to the acquired current pre-deformation deformation, and the straightening amount threshold and the pre-deformation amount threshold of the frame side member are updated with the current straightening amount and the current pre-deformation amount, respectively.

[0089] That is, after straightening, it is necessary to detect whether the final frame side member reaches the precision standard. If it reaches the standard, the data is recorded and stored in the database as the basis data for the next call. If it cannot reach the standard, step S68 is executed.

[0090] S68. Adjust the straightening amount output by the clamping actuator, and repeat steps S64-S66.

[0091] It should be noted that the specific adjustment of the straightening amount and the determination of the corresponding threshold are the same as in Embodiment One, and therefore this scheme will not be described again.

[0092] The current pre-deformation variable is calculated according to the current pre-deformation deformation variable, including: determining a pre-deformation parameter and a second function relationship between the pre-deformation parameter and sample data obtained from a plurality of correction experiments; wherein the sample data further includes a pre-deformation deformation variable and a pre-deformation variable; and calculating the current pre-deformation variable according to the current pre-deformation deformation variable and the second function relationship.

[0093] Embodiment three:

[0094] Please see Figure 3 、 Figure 4 and Figure 7 , wherein, Figure 7 The system principle block diagram of the automatic control welding deformation is shown. The automatic control welding deformation system provided in the scheme can execute the automatic control method described in embodiment one and embodiment two.

[0095] Based on the automatic control welding deformation method described in embodiment one, the clamping execution mechanism 71 is used to output a post-welding correction force to a tooling fixture, the storage unit 72 is used to store a pre-set correction amount threshold, the acquisition unit 73 is used to acquire a current correction deformation variable of a workpiece in a control process, and the control unit 74 is used to output a control instruction to a control end of the clamping execution mechanism according to the pre-set correction amount threshold; and the control unit 74 further takes the current workpiece satisfying the accuracy requirement after post-welding correction control as a judgment condition, determines a current correction amount according to the current correction deformation variable, and updates the correction amount threshold with the current correction amount.

[0096] The clamping execution mechanism is arranged on the tooling base 1. As shown in Figure 3 and Figure 4 , the clamping execution mechanism 71 includes a servo driving part 2, a clamping mechanism 6 and a clamping cylinder 5, wherein the clamping mechanism 6 is located above the frame longitudinal beam 9 (a workpiece to be processed), and the clamping cylinder 5 is located below the frame longitudinal beam 9, that is, the two are located on both sides of the workpiece to be processed.

[0097] In the scheme, the clamping mechanism 6 is used to limit the deformable variable of the frame longitudinal beam 9. Specifically, according to the control instruction output by the control unit 74, the clamping mechanism 6 can be driven by the servo driving part 2 to adjust the working position, so as to limit and determine the deformable variable of the frame longitudinal beam 9; correspondingly, according to the control instruction output by the control unit 74, the clamping cylinder 5 can output a clamping force to the tooling fixture, thereby realizing the correction operation.

[0098] Wherein, the acquisition unit 73 preferably adopts a displacement sensor 4 for acquiring the deformation variable of the corresponding part of the current workpiece and feeding back to the control unit 74 for accuracy judgment, correction amount calculation and fitting.

[0099] In addition, a scale 3 for observing the deformation is arranged on the tool base 1, and is used for observing the consistency between the adjustment amount and the set amount in the experience data statistics stage.

[0100] Based on the method for automatically controlling the welding deformation in the second embodiment, the clamping execution mechanism 71 is further used for outputting a pre-welding pre-deformation force to the tool clamp, the storage unit 72 is further used for storing a pre-set pre-deformation threshold, the acquisition unit 73 is further used for acquiring a current pre-deformation deformation of the workpiece in the control process, and the control unit 74 is further used for outputting a control instruction to a control end of the clamping execution mechanism according to the pre-set pre-deformation threshold; meanwhile, the control unit 74 further takes the current workpiece satisfying the accuracy requirement after the post-welding correction control as a judgment condition, calculates a current pre-deformation deformation according to the current pre-deformation deformation, and updates the pre-deformation threshold according to the current pre-deformation deformation.

[0101] It should be noted that the automatic control correction scheme is described in detail in the embodiment by taking the frame longitudinal beam as the description object, and the longitudinal beam front end positioning mechanism 7 and the longitudinal beam rear end positioning mechanism 8 shown in the figure are both adapted to the frame longitudinal beam 9. For other workpieces to be processed, the corresponding positioning mechanisms can be adaptively selected and replaced, and it can be understood that the positioning mechanism is not the core point of the application, and can be realized by the person skilled in the art based on the prior art, so the text will not be described again.

[0102] The above is only the preferred embodiment of the present application, and it should be noted that for ordinary skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of automatically controlling welding distortion, characterized by, The following post-weld straightening steps are included: The control of post-weld straightening of the workpiece is executed based on the preset straightening amount threshold, and the current straightening deformation of the workpiece is collected during the control process. The current workpiece after post-weld straightening control meets the accuracy requirements as the judgment condition. The current straightening amount is calculated and determined based on the current straightening deformation, and the straightening amount threshold is updated with the current straightening amount. The step of calculating and determining the current orthodontic amount based on the current orthodontic deformation includes: Using sample data obtained from multiple correction experiments, orthodontic parameters and a first functional relationship between the orthodontic parameters and the sample data are determined; wherein, the sample data includes orthodontic deformation and orthodontic amount; The current orthopedic amount is calculated based on the current orthopedic deformation and the first functional relationship.

2. The method of automatically controlling welding distortion according to claim 1, wherein, The preset orthopedic threshold is determined using sample data obtained from multiple orthopedic experiments.

3. The method of automatically controlling welding distortion according to claim 1 or 2, characterized in that, It also includes the following pre-deformation steps before welding: The pre-deformation of the workpiece before welding is controlled based on a preset pre-deformation threshold, and the current pre-deformation amount of the workpiece is collected during the control process. The current workpiece meets the accuracy requirements after post-weld straightening control as the judgment condition. The current pre-deformation variable is calculated based on the current pre-deformation variable, and the pre-deformation threshold is updated with the current pre-deformation variable.

4. The method of automatically controlling welding distortion according to claim 3, wherein The step of calculating the current pre-deformation variable based on the current pre-deformation variable includes: Using sample data obtained from multiple correction experiments, pre-deformation parameters and a second functional relationship between the pre-deformation parameters and the sample data are determined; wherein, the sample data also includes pre-deformation deformation and pre-deformation amount; The current pre-deformation variable is calculated based on the current pre-deformation variable and the second functional relationship.

5. The method of automatically controlling welding distortion according to claim 4, wherein, If the current workpiece after post-weld straightening control does not meet the accuracy requirements, the straightening amount output by the clamping actuator is adjusted, and the corresponding current straightening deformation is collected again until the current workpiece after post-weld straightening control meets the accuracy requirements.

6. The method of automatically controlling welding distortion according to claim 5, wherein, Before performing the control of post-weld straightening of the workpiece, or before performing the control of pre-weld pre-deformation of the workpiece, the clamping actuator is self-checked.

7. A system for automatically controlling welding distortion, characterized by include: The clamping actuator is used to output the post-weld straightening force to the tooling fixture; Storage unit, used to store preset orthopedic threshold values; The acquisition unit is used to acquire the current correction deformation of the workpiece during the control process; The control unit is used to output control commands to the control end of the clamping actuator according to the preset correction amount threshold; the control unit also uses the current workpiece after the post-weld correction control meeting the accuracy requirements as a judgment condition, calculates and determines the current correction amount according to the current correction deformation, and updates the correction amount threshold with the current correction amount; The step of calculating and determining the current orthodontic amount based on the current orthodontic deformation includes: Using sample data obtained from multiple correction experiments, orthodontic parameters and a first functional relationship between the orthodontic parameters and the sample data are determined; wherein, the sample data includes orthodontic deformation and orthodontic amount; The current orthopedic amount is calculated based on the current orthopedic deformation and the first functional relationship.

8. The system of claim 7, wherein, The clamping actuating mechanism is also used for outputting a pre-welding pre-deformation force to the tooling fixture, the storage unit is also used for storing a preset pre-deformation threshold, the acquisition unit is also used for acquiring a current pre-deformation deformation variable of the workpiece in a control process, and the control unit is also used for outputting a control instruction to a control end of the clamping actuating mechanism according to the preset pre-deformation threshold; the control unit also takes that the current workpiece after post-welding shape correction control meets a precision requirement as a judgment condition, calculates a current pre-deformation variable according to the current pre-deformation deformation variable, and updates the pre-deformation threshold according to the current pre-deformation variable.

9. The system of automatically controlling welding distortion of claim 8, wherein, The clamping actuating mechanism is arranged on a tooling base, and a scale is arranged on the tooling base and used for observing a deformation variable.

10. The system of claim 9, wherein, The clamping actuating mechanism comprises a servo driving part, a clamping mechanism and a clamping cylinder, the clamping mechanism and the clamping cylinder are respectively arranged on two sides of the workpiece to be processed, the clamping mechanism is used for limiting a deformable variable of the workpiece to be processed, the clamping cylinder can output a clamping force to the tooling fixture according to the control instruction, and the servo driving part can drive the clamping mechanism to adjust a working position according to the control instruction.

11. The system of automatically controlling welding distortion of claim 10, wherein, The acquisition unit is specifically a displacement sensor.

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