System and method for realizing automatic matching of welding parameters through approximate matching principle

Abstract

The invention discloses a system and a method for realizing automatic matching of welding parameters through an approximate matching principle. The method comprises the following steps: according to an approximate matching principle, matching historical plate group information of a passing vehicle model with plate group information of all theoretical welding spots of a certain vehicle model to be matched with welding parameters to obtain a matched welding parameter value of each theoretical welding spot in the certain vehicle model; converting the corresponding position information of all welding spots of the certain vehicle type in the operation program of the robot on the production line into a vehicle body coordinate system; and the matched welding parameter value of each theoretical welding spot in the certain vehicle model is given to the corresponding welding spot which is in charge of welding by the robot and is converted into the vehicle body coordinate system. When a new vehicle model is imported, welding parameter reference values can be automatically obtained in batches, welding parameters are formulated according to the reference values, or the initial parameter range of a welding test is reduced, and the welding parameter formulating process is simplified; and the automobile production period is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive welding, and particularly relates to a system and method for automatically matching welding parameters through the principle of approximate matching. Background Art

[0002] In the field of automotive manufacturing, the welding process is a key link in body assembly, and its quality directly affects the overall performance and safety of the vehicle. At present, the welding parameter settings of each automotive OEM are generally based on the experience of process personnel. After inputting the initial process parameters, continuous debugging and improvement are carried out under the actual working conditions on site. Due to the complex environment in the automotive production site, there are various interference factors, such as vibration during equipment operation, electromagnetic interference in the workshop, etc., making it difficult for the initially set parameters to reach the ideal state at one time. After each parameter adjustment, it is necessary to wait for the production line to run for a period of time to observe the welding effect, and this process is extremely time-consuming. To ensure the welding quality, it is also necessary to combine multiple rounds of quality inspection means such as chiseling, measuring, and destructive inspection to determine whether the welding quality meets the standards; this process requires a large amount of time and resources, and this detection method will not only cause irreversible damage to the product, increase the production cost, but also extend the production cycle.

[0003] With the increasingly fierce competition in the automotive market and the continuous increase in consumers' personalized demands for automobiles, automotive OEMs need to frequently launch new models. The welding process of new models may vary due to changes in body structure design and the materials used, which means that process personnel need to re-explore welding parameters for each new model, further consuming a large amount of time and resources. In the current situation of pursuing high-efficiency production and quickly responding to market demands, this traditional method of setting welding parameters has been difficult to meet the needs of the rapid development of the automotive industry, and there is an urgent need for a more scientific and efficient technical solution for welding parameter matching and adjustment. Summary of the Invention

[0004] In order to solve the problems proposed in the background art, the present invention proposes a system and method for automatically matching welding parameters through the principle of approximate matching.

[0005] A system for automatically matching welding parameters through the principle of approximate matching to achieve one of the purposes of the present invention includes:

[0006] Matching parameter acquisition module: used to match the historical panel group information of past vehicle models with the panel group information of all theoretical welding points of a certain vehicle model for which welding parameters are to be matched according to the principle of approximate matching, and obtain the matching welding parameter values of each theoretical welding point in the certain vehicle model; the welding parameters include: gun pressing force, energization time, and energization current; the panel group information includes: sheet thickness, sheet steel number, and sheet type. For new vehicle models, the panel group information and welding parameters can be extracted from the vehicle model design data, and for past vehicle models, the panel group information and welding parameters can be extracted from the historical welding database; where the sheet steel number includes the tensile strength of the sheet.

[0007] Coordinate conversion module: used to convert the position information corresponding to all welding points responsible for welding by the robot on the production line of a certain vehicle model in its operation program to the body coordinate system.

[0008] Matching module: used to assign the matching welding parameter values of each theoretical welding point in the certain vehicle model to the corresponding welding points after being converted to the body coordinate system and responsible for welding by the robot on the production line.

[0009] Furthermore, it further includes an adjustment module, used to adjust the robot offline program so that the deviation between the position of each welding point responsible for welding by the robot and the corresponding theoretical welding point meets the set requirements. The set requirements include: the deviation is less than the set threshold; that is, when the deviation is less than the set threshold, it is considered that the deviation meets the set requirements.

[0010] Even further, the calculation method of the deviation includes:

[0011] δ=(x iA -x basei ) 2 +(y iA -y basei ) 2 +(z iA -z basei ) 2

[0012] In the formula:

[0013] (x iA , y iA , z iA ) is the position of the welding point responsible for welding by the robot in the body coordinate system; (x basei , y basei , z basei ) is the position of the body welding point.

[0014] Technical effect: The above adjustment module adjusts the robot offline program, so that the deviation between the position of each welding point responsible for welding by the robot and the corresponding theoretical welding point meets the set requirements, ensuring the accuracy of the actual welding position of the robot, reducing welding defects caused by the deviation of the welding point position, such as false soldering, missed soldering, etc., thereby improving the welding quality and enhancing the strength and consistency of the automobile body structure.

[0015] Further, one of the methods for obtaining the matching parameter value includes:

[0016] When the plate thickness and plate steel grade in the plate group information of the theoretical welding point are the same as those in the plate group information of a certain past vehicle model, the welding parameters corresponding to the said plate group information of the past vehicle model are used as the matching parameter value of the theoretical welding point. Its technical effects include: It can quickly and accurately match the most suitable welding parameters for the welding point. Because the same plate thickness and steel grade mean similar welding characteristics, using the past successful welding parameters can effectively guarantee the welding quality and reduce welding problems caused by improper parameters.

[0017] Further, another method for obtaining the matching parameter value includes:

[0018] When the plate steel grades of the theoretical welding point and the past vehicle models are not the same, and the plate thickness and plate tensile strength in the plate group information are the same as those in the plate group information of a certain past vehicle model, the welding parameters corresponding to the said plate group information of the past vehicle model are used as the matching parameter value of the theoretical welding point. Its technical effects include: This matching method expands the applicable range of welding parameter matching. For plates with new steel grades but similar thickness and tensile strength to past vehicle models, this method can be used to determine appropriate welding parameters to ensure the smooth implementation of the welding process for new vehicle models.

[0019] Further, a third method for obtaining the matching parameter value includes:

[0020] When the plate steel grades of the theoretical welding point and the past vehicle models are not the same, the plate thickness in the plate group information is the same as that in the plate group information of a certain past vehicle model, and the difference between the tensile strength and the tensile strength in the plate group information of a certain past vehicle model is not 0 and within the set threshold, the welding parameters corresponding to the said plate group information of the past vehicle model are used as the matching parameter value of the theoretical welding point. Its technical effects include: This method allows a certain range of tensile strength differences. In actual production, even if there are slight differences in the plates, relatively appropriate welding parameters can be found in this way, improving the practicability of the solution.

[0021] Further, a fourth method for obtaining the matching parameter value includes:

[0022] When the steel grade of the sheet material at the theoretical welding point is inconsistent with that of the sheet materials in past vehicle models, the sheet material type in the sheet group information is consistent with that in a certain sheet group information of past vehicle models, the difference between the thickness and the thickness in a certain sheet group information of past vehicle models is not zero but within the set threshold, and the difference between the tensile strength and the tensile strength in a certain sheet group information of past vehicle models is not zero and within the set threshold, then the welding parameters corresponding to the said certain sheet group information of past vehicle models are taken as the matching parameter values for this theoretical welding point. Its technical effects include: This matching method takes into account multiple factors such as sheet material type, thickness, and tensile strength, can handle more complex sheet material combinations, and provides the possibility for welding parameter matching of various new vehicle models.

[0023] Furthermore, the fifth method for obtaining the matching parameter values includes:

[0024] Condition 1: When the sheet material thickness and steel grade in the sheet group information of the theoretical welding point are consistent with those in a certain sheet group information of past vehicle models, then the welding parameters corresponding to the said certain sheet group information of past vehicle models are taken as the matching parameter values for this theoretical welding point; otherwise, proceed to the judgment of the next Condition 2.

[0025] Condition 2: When the sheet material thickness and tensile strength in the sheet group information of a certain theoretical welding point are consistent with those in a certain sheet group information of past vehicle models, then the welding parameters corresponding to the said certain sheet group information of past vehicle models are taken as the matching parameter values for this theoretical welding point; otherwise, proceed to the judgment of the next Condition 3.

[0026] Condition 3: When the sheet material thickness in the sheet group information of the theoretical welding point is consistent with that in a certain sheet group information of past vehicle models, and the difference between the tensile strength of the theoretical welding point and the tensile strength in a certain sheet group information of past vehicle models is within the set threshold, then the welding parameters corresponding to the said certain sheet group information of past vehicle models are taken as the matching parameter values for this theoretical welding point; otherwise, proceed to the judgment of the next Condition 4.

[0027] Condition 4: When the sheet material type in the sheet group information of the theoretical welding point is consistent with that in a certain sheet group information of past vehicle models, the difference between the thickness and the thickness in a certain sheet group information of past vehicle models is within the set threshold, and the difference between the tensile strength and the tensile strength in a certain sheet group information of past vehicle models is within the set threshold, then the welding parameters corresponding to the said certain sheet group information of past vehicle models are taken as the matching parameter values for this theoretical welding point.

[0028] The technical effects of the above matching method include: by means of step-by-step conditional judgment, starting from the same plate thickness and steel grade, then to the same thickness and tensile strength, and then to the case where the thickness and tensile strength are within a certain difference threshold, etc., the matching is carried out in sequence to comprehensively and orderly find suitable welding parameters for the weld points of a certain vehicle model. This progressive matching method ensures that the most suitable welding parameters can be found as much as possible in various situations, improving the success rate and accuracy of welding parameter matching, thus guaranteeing the welding quality and meeting the welding requirements of different new vehicle models.

[0029] A method for automatically matching welding parameters by means of the approximate matching principle to achieve the second object of the present invention includes:

[0030] According to the approximate matching principle, match the historical plate group information of past vehicle models with the plate group information of all theoretical weld points of a certain vehicle model for which the welding parameters are to be matched, and obtain the matching welding parameter values for each theoretical weld point in the said certain vehicle model;

[0031] Convert the position information of all weld points welded by a certain robot on a certain production line of a certain vehicle model in its operation program relative to the robot coordinate system into the position information in the vehicle body coordinate system;

[0032] Assign the matching welding parameter values of each theoretical weld point in the said certain vehicle model to the corresponding weld points welded by the robot.

[0033] A non-transitory computer-readable storage medium for achieving the third object of the present invention, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for automatically matching welding parameters by means of the approximate matching principle are implemented.

[0034] A computer program product for achieving the fourth object of the present invention includes a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of the method for automatically matching welding parameters by means of the approximate matching principle are implemented.

[0035] The beneficial effects of the present invention include: when the present invention is used for the introduction of new vehicle models, the reference values of welding parameters can be automatically obtained in batches, and the welding parameters can be formulated based on the reference values, or the initial parameter range of welding tests can be reduced, simplifying the welding parameter formulation process; shortening the automobile production cycle. Description of the Drawings

[0036] Figure 1 is the process of approximate matching and automatic input of welding parameters;

[0037] Figure 2 is the approximate matching rule when welding parameters are automatically matched. Detailed Embodiments

[0038] The following specific embodiments are used to explain the technical solution of the present invention so that those skilled in the art can understand the present invention. The protection scope of the present invention is not limited to the following specific implementation structures. Those made by those skilled in the art that include the technical solution of the present invention and are different from the following specific embodiments are also within the protection scope of the present invention.

[0039] An embodiment of the present invention provides a method for automatically matching welding parameters through the principle of approximate matching. The specific steps are as Figure 1 follows, including:

[0040] Step S101: Obtain all the theoretical solder joint positions P base1 ~P basen of a certain vehicle model for which welding parameters need to be matched and their corresponding panel group information S 1 ~S n . At the same time, collect the historical panel group information S old of past vehicle models and their corresponding historical welding parameters W old .

[0041] Specifically, the above-mentioned theoretical solder joint positions can be obtained by referring to the body drawing. For example, the position information of solder joint P base1 is P base1 =(x base1 , y base1 , z base1 ). Among them, x, y, and z represent the position coordinates in space.

[0042] The panel group information is expressed as S i ={sheet metal s i1 , sheet metal s i2 , sheet metal s i3}. The panel group information includes the sheet metal thickness, sheet metal grade, and sheet metal type, and can be extracted from the vehicle model design data.

[0043] The welding parameters are expressed as w i ={welding torch pressure F i , energization time t i , energization current I i}.

[0044] Collect all the historical panel group information S old and welding parameters W old of past vehicle models from the historical welding database, which are respectively expressed as S old ={S 1 old ,…,S n old}, W old ={w 1 old ,…,w nold}.

[0045] Step S102: According to the approximate matching principle, match the historical welding parameters W of past vehicle models old with all the theoretical welding points P base1 ~P basen in the certain vehicle model to obtain the matching accuracy and matching parameter values of each welding point in the certain vehicle model.

[0046] In some embodiments, as Figure 2 shown, through the following steps S201~204, the welding parameters of all the welding points of the certain vehicle model can be obtained.

[0047] Step S201: Obtain all the theoretical welding point position information P base1 ~P basen and its corresponding sheet group information S 1 ~S n . Obtain the sheet group information S of the past vehicle models in hand old and its corresponding welding parameters W old .

[0048] The past historical sheet group information S of the past vehicle models in hand old ={S 1 old , S 2 old}, the sheet group S 1 old ={sheet s 11 old , sheet s 12 old , sheet s 13 old}. The example of the sheet group information is as follows:

[0049] Sheet s 11 old ={cold-rolled galvanized steel with a thickness of 0.65 mm and a steel grade of JAC270D-45 / 45}; sheet s 12 old ={hot-rolled steel with a thickness of 2.3 mm and a steel grade of JSH980}; sheet s 13 old ={cold-rolled galvanized steel with a thickness of 1.4 mm and a steel grade of JAC780YL}; sheet s 21 old ={cold-rolled galvanized steel with a thickness of 0.65 mm and a steel grade of JAC270D-45 / 45}; sheet s 22 old ={hot-rolled steel with a thickness of 1.6 mm and a steel grade of JSH980}; sheet s 23 old={Cold-rolled galvanized steel with a thickness of 1.4 mm and steel grade JAC780YL};

[0050] The plate group information S old ={S 1 old , S 2 old} The corresponding welding parameters are W old ={w 1 old , w 2 old}. Among them, the plate group S 1 old The corresponding welding parameter w 1 old ={Welding gun pressure 350 kN, energization time 25 cyc, energization current 8.5 kA}; The plate group S 2 old The corresponding welding parameter w 2 old ={Welding gun pressure 450 kN, energization time 18 cyc, energization current 10.2 kA};

[0051] Step S202: According to the following principles, match the welding parameter values for the solder joints of a certain vehicle model:

[0052] 1. Match the plate groups with exactly the same plate thickness and plate steel grade;

[0053] 2. If condition 1 is not met, then match the plate groups with exactly the same thickness and tensile strength; The tensile strength is obtained according to the steel grade; Such as obtained by referring to the relevant steel standard manual according to the steel grade or the technical data provided by the material supplier;

[0054] 3. If both conditions 1 and 2 are not met, then match the plates with exactly the same plate thickness and the closest tensile strength up or down;

[0055] 4. If conditions 1 to 3 are not met, then ensure that the plate types are the same, and the remaining plates are matched with the plates with the closest thickness and tensile strength up or down.

[0056] For example, the solder joint P 1 in step S201, its corresponding plate group information S 1 , will be compared with S old , and it is found that S 1 and S 1 old , S 2 old do not meet condition 1, and only S 1 old meets condition 2.

[0057] For example, after condition 2 is satisfied, S 1 old The corresponding welding parameter w 1 old is matched with S 1 .

[0058] Step S203: Output the matched welding parameters and output the matching accuracy according to the following rules:

[0059] 1. For the plate group that satisfies condition 1 in step S202, the matching accuracy is A;

[0060] 2. For the plate group that satisfies condition 2 in step S202, the matching accuracy is B;

[0061] 3. For the plate group that satisfies condition 3 in step S202, the matching accuracy is C;

[0062] 4. For the plate group that satisfies condition 4 in step S202, the matching accuracy is D;

[0063] For example, the solder joints P 1 in steps S201 and S202 1 The output welding parameter is w 1 old ={torch pressure 350kN, energization time 25cyc, energization current 8.5kA} (consistent with w 1 old ). At the same time, because w 1 Satisfies condition 2 in step S202, and the matching accuracy B is output at the same time.

[0064] Step S204: Repeat the above steps until the welding parameter matching and output are completed for all solder joints.

[0065] Step S103: Obtain the position information P robot1 ~P robotn corresponding to all the solder joints welded by a certain robot on a certain production line for a certain vehicle model in its operation program.

[0066] In one embodiment, by referring to the robot offline program, the position information P robot1 =(x,y,z) of a certain solder joint relative to the robot coordinate origin can be known, and it is converted into the position information P robot1A =(x 1A ,y 1A ,z 1A ) in the vehicle body coordinate system. At the same time, by reading the robot welding program, it can be known that a certain robot has a total of n solder joints, and the position information P robot1 ~P robotnThe position information is converted into the position information P in the vehicle body coordinate system robot1A ~P robotnA 。

[0067] Step S104: Set the deviation function δ to represent the matching error between the solder joint position information P in the robot program robotiA and the solder joint position information P of the vehicle body basei 。

[0068] In one implementation, the matching error amount is characterized by the arithmetic mean square deviation, and its deviation function is expressed as:

[0069] δ = (x iA - x basei ) 2 + (y iA - y basei ) 2 + (z iA - z basei ) 2

[0070] Through the above method, the deviation amount between the solder joint position information of all solder joints in the robot and the theoretical position information in the vehicle body can be calculated

[0071] In a certain embodiment, by adjusting the robot offline program, the deviation function of the position of each solder joint in the robot from the theoretical position of the solder joint in the vehicle body meets the requirements

[0072] For example, after adjusting the offline program, the matching error δ between the solder joint position information P in the robot program described in step S103 robot1A and the solder joint position information P of the vehicle body base1 is δ = 20 < 25; then it can be considered that the solder joint position coordinates are within the error range

[0073] In a certain embodiment, when the error value of the deviation function δ is within 25, it can be considered to be within the error range

[0074] Step S105: After the matching error value meets the requirements, assign the matching welding parameter value of the P basei solder joint to P robotiA 。

[0075] Step S106: Generate the corresponding process file according to the company's requirements and automatically input the matching welding parameters into the offline program. Specifically, it includes:

[0076] According to the established process file template of the company, use professional document generation software to generate the corresponding process file. The process file details key information such as welding parameters, solder joint position information, and matching accuracy. For example, in the process file, clearly list the number, theoretical position, matching welding parameters, and matching accuracy of each solder joint

[0077] Through an automated program interface, the matching welding parameters are automatically entered into the robot offline program. During the entry process, data verification is performed to ensure the accuracy of the entered parameters. At the same time, the entered offline program is simulated and tested to check whether the welding process is normal. If there are any abnormalities, the parameters or the program are adjusted in a timely manner.

[0078] It should be understood that the above detailed description is only exemplary and explanatory, and does not limit this application.

[0079] It should be understood that although Figures 1 to 2 each step in the flowchart of Figures 1 to 2 is displayed in sequence according to the indication of the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover,

[0080] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0081] The embodiments of the present invention also provide a system for automatically matching welding parameters through the principle of approximate matching, including:

[0082] A matching parameter acquisition module: used to match the historical panel group information of past vehicle models with the panel group information of all theoretical welding points of a certain vehicle model with welding parameters to be matched according to the principle of approximate matching, and obtain the matching welding parameter values of each theoretical welding point in the certain vehicle model;

[0083] A coordinate conversion module: used to convert the position information corresponding to all welding points responsible for welding by the robot on the production line of the certain vehicle model in its operation program into the body coordinate system;

[0084] A matching module: used to assign the matching welding parameter values of each theoretical welding point in the certain vehicle model to the corresponding welding points after conversion into the body coordinate system, which are responsible for welding by the robot on the production line.

[0085] In some embodiments, it further includes an adjustment module for adjusting the robot offline program to make the deviation between the position of each welding point responsible for welding by the robot and the corresponding theoretical welding point meet the set requirements. The calculation of the deviation includes:

[0086] δ = (x iA - x basei ) 2 + (y iA - y basei ) 2 + (z iA - z basei ) 2

[0087] In the formula:

[0088] (x iA , y iA , z iA ) is the position of the welding point responsible for welding by the robot in the body coordinate system; (x basei , y basei , z basei ) is the position of the body welding point.

[0089] In some embodiments, the method for obtaining the matching parameter value includes:

[0090] Condition 1: When the plate thickness and plate steel grade in the plate group information of a certain theoretical welding point are the same as those in the plate group information of a certain previous vehicle model, the welding parameters corresponding to the plate group information of the previous vehicle model are used as the matching parameter value of the theoretical welding point;

[0091] Condition 2: When the plate thickness and plate tensile strength in the plate group information of a certain theoretical welding point are the same as those in the plate group information of a certain previous vehicle model, the welding parameters corresponding to the plate group information of the previous vehicle model are used as the matching parameter value of the theoretical welding point; otherwise, proceed to the judgment of the next condition 3;

[0092] Condition 3: When the plate thickness in the plate group information of a certain theoretical welding point is the same as that in the plate group information of a certain previous vehicle model, and the difference between the tensile strength and the tensile strength in the plate group information of the previous vehicle model is within the set threshold, the welding parameters corresponding to the plate group information of the previous vehicle model are used as the matching parameter value of the theoretical welding point; otherwise, proceed to the judgment of the next condition 4;

[0093] Condition 4: When the sheet type in the sheet group information of a certain theoretical solder joint is the same as that in the sheet group information of a previous vehicle model, the difference in thickness from that in the sheet group information of a previous vehicle model is within the set threshold, and the difference in tensile strength from that in the sheet group information of a previous vehicle model is within the set threshold, then the welding parameters corresponding to the said sheet group information of the previous vehicle model are used as the matching parameter values for this theoretical solder joint.

[0094] In some embodiments, when Condition 1 or Condition 2 is satisfied, it is considered that the matching accuracy of the said certain theoretical solder joint is high-precision matching; otherwise, it is low-precision matching; the matching accuracy is used to screen whether a solder joint needs to undergo a welding tensile test; when the matching accuracy is low-precision matching, it is considered that this theoretical solder joint still needs to undergo a welding tensile test.

[0095] The embodiment of the present invention further provides a non-transitory computer-readable storage medium, which stores a computer program. The computer program includes program instructions, and when the program instructions are executed by a processor, each step of the method described in the present invention is implemented, which will not be elaborated here.

[0096] The computer-readable storage medium can be the internal storage unit of the data transmission device or computer device provided in any of the foregoing embodiments, such as the hard disk or memory of the computer device. The computer-readable storage medium can also be an external storage device of the computer device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the computer device.

[0097] Furthermore, the computer-readable storage medium can also include both the internal storage unit and the external storage device of the computer device. The computer-readable storage medium is used to store the computer program and other programs and data required by the computer device. The computer-readable storage medium can also be used to temporarily store data to be output or already output.

[0098] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0099] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0100] These computer program instructions can also be stored in a computer-readable memory capable of guiding a computer or other programmable data processing devices to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0101] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, such that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0102] Embodiments of the present invention also provide a computer program product, including a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of the method for automatically matching welding parameters by the approximate matching principle are implemented.

[0103] Contents not described in detail in this specification belong to the prior art well-known to those skilled in the art.

Claims

1. A system for automatically matching welding parameters by using the approximate matching principle, characterized in that: include: Matching parameter acquisition module: used to match the historical plate group information of past models with the plate group information of all theoretical welding points of a certain model whose welding parameters are to be matched according to the principle of approximate matching, and obtain the matching welding parameter value of each theoretical welding point in the certain model; Coordinate conversion module: used to convert the corresponding position information of all welding points that the robot is responsible for welding on the production line of the certain vehicle model in its operation program into the vehicle body coordinate system; Matching module: used to assign the matching welding parameter value of each theoretical welding point in the certain vehicle model to the corresponding welding point that is welded by the robot on the production line after being converted into the vehicle body coordinate system.

2. The system for realizing automatic matching of welding parameters by approximate matching principle as claimed in claim 1, characterized in that: It also includes an adjustment module, which is used to adjust the robot's offline program so that the deviation between the position of each welding point that the robot is responsible for welding and the corresponding theoretical welding point meets the set requirements.

3. The system for automatically matching welding parameters by using the approximate matching principle as claimed in claim 1, characterized in that: The method for obtaining the matching parameter value includes: When the plate thickness and plate steel grade in the plate group information of the theoretical weld point are consistent with the plate thickness and plate steel grade in a certain plate group information of a past vehicle model, the welding parameters corresponding to the said certain plate group information of the past vehicle model are used as the matching parameter values ​​of the theoretical weld point.

4. The system for realizing automatic matching of welding parameters by using the approximate matching principle as claimed in claim 1 or 2, characterized in that: The method for obtaining the matching parameter value includes: When the plate steel grade of the theoretical weld point is inconsistent with the plate steel grade of the past vehicle model, and the plate thickness and plate tensile strength in the plate group information are consistent with the plate thickness and plate tensile strength in a certain plate group information of the past vehicle model, the welding parameters corresponding to the said certain plate group information of the past vehicle model are used as the matching parameter values ​​of the theoretical weld point.

5. The system for realizing automatic matching of welding parameters by approximate matching principle as claimed in claim 1 or 2, characterized in that: The method for obtaining the matching parameter value includes: When the plate steel grade of the theoretical welding point is inconsistent with the plate steel grade of the past vehicle model, the plate thickness in the plate group information is consistent with the plate thickness in a certain plate group information of the past vehicle model, and the difference between the tensile strength and the tensile strength in a certain plate group information of the past vehicle model is not 0 and is within the set threshold, the welding parameters corresponding to the said certain plate group information of the past vehicle model are used as the matching parameter values ​​of the theoretical welding point.

6. The system for automatically matching welding parameters by using the approximate matching principle as claimed in claim 1 or 2, characterized in that: The method for obtaining the matching parameter value includes: When the plate steel grade of the theoretical welding point is inconsistent with the plate steel grade of the past vehicle model, the plate type in the plate group information is consistent with the plate type in a plate group information of the past vehicle model, the difference in thickness with the thickness in a plate group information of the past vehicle model is not 0 but within the set threshold, and the difference in tensile strength with the tensile strength in a plate group information of the past vehicle model is not 0 and within the set threshold, the welding parameters corresponding to the said plate group information of the past vehicle model are used as the matching parameter values ​​of the theoretical welding point.

7. The system for realizing automatic matching of welding parameters by using the approximate matching principle as claimed in claim 1 or 2, characterized in that: The method for obtaining the matching parameter value includes: Condition 1: When the plate thickness and plate steel grade in the plate group information of the theoretical welding point are consistent with the plate thickness and plate steel grade in a certain plate group information of a previous vehicle model, the welding parameters corresponding to the said certain plate group information of the previous vehicle model are used as the matching parameter values ​​of the theoretical welding point; otherwise, proceed to the judgment of the next condition 2; Condition 2: When the plate thickness and plate tensile strength in the plate group information of the theoretical welding point are consistent with the plate thickness and plate tensile strength in a certain plate group information of a previous vehicle model, the welding parameters corresponding to the said certain plate group information of the previous vehicle model are used as the matching parameter values ​​of the theoretical welding point; otherwise, the judgment of the next condition 3 is transferred; Condition 3: When the plate thickness in the plate group information of the theoretical weld point is consistent with the plate thickness in a certain plate group information of a previous vehicle model, and the difference between the tensile strength of the theoretical weld point and the tensile strength in a certain plate group information of a previous vehicle model is within the set threshold, the welding parameters corresponding to the certain plate group information of the previous vehicle model are used as the matching parameter values ​​of the theoretical weld point; otherwise, proceed to the judgment of the next condition 4; Condition 4: When the plate type in the plate group information of the theoretical weld is consistent with the plate type in a plate group information of a past vehicle model, the difference between the thickness and the thickness in a plate group information of a past vehicle model is within the set threshold, and the difference between the tensile strength and the tensile strength in a plate group information of a past vehicle model is within the set threshold, the welding parameters corresponding to the plate group information of the past vehicle model are used as the matching parameter values ​​of the theoretical weld.

8. A method for automatically matching welding parameters by using the approximate matching principle, characterized in that: include: According to the approximate matching principle, the historical plate group information of the past vehicle models is matched with the plate group information of all theoretical welding points of a certain vehicle model whose welding parameters are to be matched, so as to obtain the matching welding parameter value of each theoretical welding point in the certain vehicle model; Convert the position information corresponding to all welding points of the vehicle model that are welded by the robot on the production line in its operation procedure into the vehicle body coordinate system; The matching welding parameter value of each theoretical welding point in the certain vehicle model is assigned to the corresponding welding point that is responsible for welding by the robot on the production line after being converted into the vehicle body coordinate system.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for automatically matching welding parameters by using the approximate matching principle as described in any one of claim 8 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method for automatically matching welding parameters by using the approximate matching principle as described in claim 8 are implemented.

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