Method and system for calculating design working hours of spot welding clamping plate

Abstract

The invention relates to a method and a system for calculating design working hours of a spot welding cardboard. The method comprises the following steps of: determining a trial-manufactured vehicle type level according to project planning and vehicle type positioning; body-in-white trial-manufacturing data and BOM are obtained; disassembling the body-in-white into a plurality of primary welding assemblies according to the welding assemblies; each first-stage welding assembly is disassembled into a plurality of second-stage welding assemblies, third-stage welding assemblies, fourth-stage welding assemblies and the like; welding process cards are designed according to all levels of welding assemblies; calculating a difficulty coefficient; calculating the welding clamping plate working hours of the first-stage welding assembly; calculating total working hours; according to the design man-hour calculation formula of the spot welding clamping plate, the man-hour verification efficiency is improved, the accuracy is improved, the welding process card can be fed back and optimized, and powerful support is provided for subsequent personnel arrangement or outsourcing.

Description

Technical Field

[0001] The invention relates to a method and system for calculating the design man-hours of a spot welding pallet. Background Art

[0002] In the past, the welding points of welding assemblies were marked on physical parts by comparing the welding process documents with drawings, and marking the spot welding positions and types with a marker pen on the sheet metal parts. This method has a high bit error rate, low efficiency, and poor consistency in the position of welding points.

[0003] The existing design hours for spot welding pallets are roughly estimated based on similar design hours for completed projects. There is no complete analysis and evaluation process, and there is often a large difference between the estimated time and the actual completion time. This will result in large cost errors when outsourcing bidding, and it is impossible to control the cycle and cost more accurately. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art and provide a method and system for calculating the design time of a spot welding pallet.

[0005] The spot welding welding pallet in the present invention is a kind of 3D printing technology, and is designed on it for marking the exclusive round holes or triangular through holes for spot welding and projection welding bolts of 2 or 3 layers of thin steel plates. Different types of welding spots are marked with a marking pen before assembly welding. However, due to the great differences in the shapes and types of welding spots of sheet metal parts, the design difficulty and working hours of the spot welding welding pallet vary greatly. In order to solve the design working hour calculation of the spot welding welding pallet, the design working hour calculation method of the spot welding welding pallet involves the number of spot welding, working hour base, working hour coefficient, total working hour, and difficulty coefficient. The labor time base is based on the design labor time of the spot welding pallet of a certain trial vehicle as the calculation benchmark, the labor time coefficient is the product of the labor time base and the difficulty coefficient, the total labor time is the sum of the design labor time of the spot welding pallet of each subassembly, and the difficulty coefficient is the ratio of the design difficulty of the spot welding pallet of each subassembly relative to the basic vehicle model. The early spot welding pallet design labor time calculation formula proposed in the present invention not only improves the labor time verification efficiency, but also improves the accuracy, and can also feedback and optimize the welding process card, providing strong support for subsequent personnel arrangements or reducing outsourcing cost errors.

[0006] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0007] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0008] A method for calculating the design time of a spot welding pallet comprises the following steps:

[0009] Step 1: Determine the vehicle model level and determine the trial model level based on project planning and vehicle model positioning;

[0010] Step 2: Obtain body-in-white trial production data and BOM;

[0011] Step 3: Disassemble the body-in-white into several first-level welding assemblies according to the welding assembly; disassemble each first-level welding assembly (such as the engine hood assembly, the left front door assembly, etc.) into multiple second-level welding assemblies; further disassemble into third-level and fourth-level welding assemblies according to the different welding complexity;

[0012] Step 4: Design welding process cards according to each welding assembly;

[0013] Step 5: Calculate the difficulty coefficient and set the difficulty coefficients of the spot welding pallet design at each level to J1, J2...Jm, where Jm = basic spot welding pallet design difficulty coefficient * Km, where m = 1, 2...n; Km is the complexity coefficient of each welding assembly relative to the basic spot welding assembly; see for detailed description Figure 2 The complex coefficient table, that is, the overlap form when welding two parts causes the spot welding welding plate to need to design step surfaces or transition surfaces and other structures, which will increase the workload.

[0014] Step 6: Calculate the man-hours for the first-level welding assembly welding pallets; multiply the difficulty coefficient of each first-level welding assembly spot welding pallet by the corresponding basic man-hours to obtain the design man-hours Tm for each first-level welding assembly spot welding pallet;

[0015] Step 7: Calculate the total working hours and enter the total working hours calculation formula

[0016]

[0017] Wherein, m = 1, 2, ... n;

[0018] Tm represents the design man-hours for spot welding of welding pallets for each first-level welding assembly of the basic vehicle model;

[0019] Jm represents the design difficulty coefficient of spot welding pallet.

[0020] Furthermore, in step one, the vehicle types are divided into A00 class, A class, B class, and C class.

[0021] Furthermore, in step three, the body in white is disassembled into several primary welding assemblies according to the welding assembly, including the engine hood welding assembly, the front door welding assembly, the rear door welding assembly, the top cover welding assembly, the left side panel welding assembly, the right side panel welding assembly, the back door welding assembly, and the floor assembly.

[0022] Furthermore, in step 4, welding process cards are designed respectively for each welding assembly; mainly based on the existing spot welding equipment, personnel and site objective conditions, the spot welding procedures and plans of each welding sub-assembly are reasonably designed, and the number of spot welding of each assembly is counted.

[0023] Furthermore, in step five, the greater the proportion of Km in each sub-assembly under the first-level welding assembly, the greater the Jm value.

[0024] The "sub-assembly" here refers to the second, third and fourth level welding assemblies that are descended from the first level welding assembly.

[0025] Furthermore, in step six, the design hours for spot welding and welding pallets of each level of welding assembly are accumulated into the design hours for spot welding and welding pallets of each first-level independent assembly; the total working hours are the accumulation of the design hours for spot welding and welding pallets of each first-level welding assembly.

[0026] Furthermore, a method for calculating the design man-hours for a spot welding pallet also includes: Step eight, multiplying the man-hours of a third-party designer by the total man-hours to obtain the outsourced development fee.

[0027] A spot welding pallet design working time calculation system, comprising:

[0028] The vehicle model level determination module is used to determine the vehicle model level and determine the trial production vehicle model level based on project planning and vehicle model positioning;

[0029] BIW trial production data locking module, used to obtain BIW trial production data and BOM;

[0030] The disassembly module is used to disassemble the body-in-white into the first-level welding assembly according to the welding assembly; disassemble each first-level welding assembly into multiple second-level welding assemblies; further split into third-level and fourth-level welding assemblies according to the different welding complexity; design welding process cards according to each welding assembly;

[0031] Difficulty coefficient calculation module, used to set the difficulty coefficient of spot welding pallet design;

[0032] Calculation module, used for calculation of first-level assembly welding pallet man-hours and total man-hours.

[0033] An apparatus comprising one or more processors;

[0034] A memory for storing one or more programs;

[0035] When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

[0036] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method as described above

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The labor time calculation formula for spot welding pallet design provided by the present invention not only improves the efficiency and accuracy of labor time verification, but also can provide feedback and optimize welding process cards, providing strong support for subsequent personnel arrangement or outsourcing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below in conjunction with the accompanying drawings:

[0040] Figure 1 A flow chart of a method for calculating the working hours for designing a spot welding pallet according to the present invention;

[0041] Figure 2 Schematic diagram of the complexity coefficient. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations 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 should not be understood as limiting the scope of protection of the present invention.

[0044] The present invention is described in detail below in conjunction with the accompanying drawings:

[0045] There are many problems with using the reference welding process card to mark the spot welding position and quantity. The use of 3D printed special spot welding pallets can significantly improve production efficiency, quality stability, welding point position accuracy and welding point marking efficiency. As the number of welding assemblies increases, the advantages of spot welding pallets become more and more obvious.

[0046] The spot welding pallet design involved in the present invention needs to design a special structure according to the shape of each sheet metal part, spot welding position, positioning hole and part boundary. Under the premise of ensuring the marking of the welding point, it also needs to meet the performance of durability, convenient operation, low cost and high precision. The complexity of the spot welding pallet design leads to great difficulty in calculation workload and design period. These influencing factors need to be reflected in the structural design and imported into the statistical table. Among them, the structural changes caused by the external size factor are as follows:

[0047] a) For spot welding pallets with dimensions less than 100mmX100mm, only positioning columns are required due to their small deformation and good rigidity;

[0048] b) For spot welding pallets with dimensions greater than 100mmX100mm and less than 300mmX300mm, due to their poor rigidity, in addition to designing positioning columns, reinforcing ribs are also required in the easily deformed areas. The thickness of the reinforcing ribs is generally 1-2mm, and the height is generally 5-10mm. If multiple parallel reinforcing ribs are designed, the spacing between two parallel reinforcing ribs is between 30-50mm. The specific value needs to be determined according to the structural characteristics of the spot welding pallet.

[0049] c) For spot welding pallets with dimensions greater than 300mmX300mm, due to their poor rigidity, two positioning columns should be designed to ensure high positioning accuracy. In addition to designing parallel reinforcement ribs, cross reinforcement ribs should be added, redundant parts should be cut off at the edges, and weight reduction holes should be designed in non-spot welding areas.

[0050] Different spot welding types are divided into 2-layer spot welding, 3-layer spot welding and projection welding bolts, and the following designs are required:

[0051] a) 2-layer spot welding: The spot welding card is designed with circular through holes at the 2-layer spot welding positions. A black marker can be used to mark the welding points.

[0052] b) 3-layer spot welding: The spot welding card is designed with triangular through holes at the 3-layer spot welding positions, and a red marker can be used to mark the welding points.

[0053] c) Projection weld bolt: A large circular hole of the same size as the projection weld bolt head is designed at the projection weld bolt position on the spot welding clamp. The large circular hole can be drawn when marking the projection weld bolt position.

[0054] The above-mentioned influencing factors increase the difficulty of spot welding pallet design, thereby increasing the workload of structural design and the difficulty of man-hour calculation. If each welding process card is evaluated and then accumulated separately, it will not only be time-consuming and labor-intensive, but the cumulative error will also be large.

[0055] In view of the shortcomings of existing estimation methods, the present invention provides a method for calculating the design time of spot welding pallets, so as to achieve the purpose of more accurately controlling project cycle and cost.

[0056] To achieve the above objectives, the present invention implements a method for calculating the design man-hours for spot welding pallets through the following calculation method, including a man-hour base, which is set to the A00-level vehicle model. Other vehicle models are higher than this vehicle model level, ensuring that the calculation results are all positive values. The man-hour coefficient determines the design man-hour multiple of the spot welding pallet of the new model relative to the A00-level vehicle model. The high-level vehicle models have greatly improved the number of parts and structural complexity relative to the low-level vehicles, and the design difficulty is also increased accordingly. The total man-hour is the sum of the design man-hours of the spot welding pallets of all first-level assemblies that need to be calculated. For different vehicle model projects, the number of welding assemblies will increase or decrease because some welding assemblies borrow from previous models. The difficulty coefficient is determined by the overlap relationship between the parts contained in the specific welding process card design. See the specific description. Figure 2 After completing the above parameter confirmation, the total working hours can be calculated according to the calculation method of the present invention:

[0057]

[0058] This calculation method can ensure efficient calculation of total working hours while improving calculation accuracy. After each calculation factor is parameterized, it is easy to use and operate. The result of this working hour calculation can be used to evaluate the working hours and number of participants in independent design, and can also be used to calculate the design cost when outsourcing design.

[0059] First, the vehicle model level is determined. This calculation method divides the vehicle models into A00, A, B, C, etc. The level of this trial model is determined based on project planning and vehicle model positioning.

[0060] Then follow the calculation flow chart operation steps. First, the trial production data and BOM should be locked to determine the specific work content and logical relationship of this spot welding pallet design work.

[0061] The Bill of Materials (BOM) is a technical document that describes the composition of a company's products. In the capital processing industry, it shows the structural relationship between the product's final assembly, subassembly, components, parts, and even raw materials, as well as the required quantity. This BOM is used to count the number of parts.

[0062] The body in white is then disassembled into first-level welding assemblies according to the welding assembly, such as: engine hood welding assembly, front door welding assembly, rear door welding assembly, top cover welding assembly, left side panel welding assembly, right side panel welding assembly, back door welding assembly, floor assembly, etc., and then each of the above-mentioned first-level welding assemblies is disassembled into multiple second-level welding assemblies, for example: the floor assembly is divided into the front floor welding assembly, the water trough welding assembly, the front cabin welding assembly, the middle floor welding assembly, the rear floor welding assembly and the rear panel welding assembly, etc. According to the complexity of welding, it needs to be further divided into third-level and fourth-level welding assemblies. Different levels of models will have an increase or decrease in the number of parts compared to the A00 level models, and it also increases the difficulty of welding levels and spot welding welding plate design.

[0063] Then design welding process cards for each welding assembly. The work content of this step is mainly to reasonably design the spot welding procedures and plans of each welding assembly based on the objective conditions such as the existing spot welding equipment, personnel and site, and count the number of spot welds of each welding assembly.

[0064] The difficulty coefficient is then calculated. Due to the differences in the overlap of parts in the welding assembly, the design hours for spot welding pallets vary greatly. It is necessary to distinguish different situations and set relevant design difficulty coefficients.

[0065] After the difficulty coefficient is determined, the man-hours for the assembly welding pallets can be calculated. The design man-hours for the spot welding pallets of each welding assembly can be obtained by multiplying the difficulty coefficient of the spot welding pallets of each welding assembly by the corresponding basic man-hours.

[0066] The total working hours are simply the accumulation of the working hours for spot welding and welding pallets of each first-level welding assembly.

[0067] Through the above technical solutions, it can be seen that compared with the existing design time estimation method, the present invention provides a method for calculating the design time of spot welding pallets. Compared with making a rough overall estimate by referring to the design time of previous vehicle models, the present invention adopts the "total-division-total" method, and proposes a set of white body disassembly, analysis, and statistical processes according to the process characteristics, and then sets the pallet design difficulty coefficient according to the complexity of different vehicle models. When using the present invention, as long as the content of the white body trial production work is determined according to the project requirements, the various parameters can be input into the formula table to obtain a more accurate design time, and the required total time can be generated. The application effect of this method in the development of a certain vehicle model is good, simple, fast and practical.

[0068] like Figure 1 As shown, an embodiment of the present invention provides a method for calculating the design time of a spot welding pallet.

[0069] The first step is to determine the vehicle type level. This method for calculating the working hours for spot welding pallet design divides vehicle types into A00, A, B, C, etc. The level of this trial production vehicle type is determined based on project planning and vehicle type positioning.

[0070] The second step is to obtain the BIW trial production data and BOM from the BIW structure design department, and use them as a basis to analyze and disassemble the BIW structure.

[0071] The third step is to disassemble the body-in-white into the first-level welding assembly according to the structure: the top cover assembly, the left side panel assembly, etc., see Table 1.

[0072] The fourth step is to design spot welding process cards for each first-level assembly. According to the objective conditions such as existing spot welding equipment, personnel and site, the spot welding process and plan of the spot welding assembly are reasonably designed. Each first-level welding assembly in the third step is divided into multiple second-level spot welding assemblies, third-level welding assemblies, fourth-level welding assemblies...

[0073] Step 5: Difficulty coefficient calculation: Figure 2 The principle shown sets the spot welding pallet design difficulty coefficients as J1, J2...Jm, where Jm = basic spot welding pallet design difficulty coefficient * Km, where m = 1, 2...n, and the greater the proportion of Km in each sub-assembly, the greater the Jm value.

[0074] Km is the complexity coefficient of each welding assembly in the new model, see Figure 2 The design difficulty of the basic spot welding pallet is generally set to 1. In actual calculation, it needs to change according to the number of updated parts of the welding assembly at this level. The value range is less than or equal to 1, that is, the fewer the number of new parts, the smaller this value.

[0075] Step 6: Calculation of the man-hours for welding pallets of the first-level welding assembly: The design man-hours for spot welding pallets of each welding assembly are accumulated to the design man-hours for spot welding pallets of each first-level welding assembly in the third step, which are T1, T2…Tm

[0076] Step 7: Enter the total working hours calculation formula

[0077]

[0078] Where m = 1, 2, ... n

[0079] The above parameters can be established in the EXCEL table, so that the total working hours calculation formula can be parameterized and updated in real time, which is simple, fast and easy to revise.

[0080] As mentioned above, this method can be used to calculate the design time of spot welding pallets, which is convenient for judging the design cycle and related personnel arrangements at the beginning of the project. Figure 1 In the eighth step, the third-party designer's labor time fee is multiplied by the total labor time to quickly obtain the outsourcing development fee. The calculation formula of the present invention is simple and fast, improves the calculation efficiency, and ensures the accuracy of the calculation, and has strong practicality.

[0081] Table 1 Difficulty coefficient classification table for vehicle types

[0082]

[0083] The present invention is not aimed at a calculation method for welding workload or welding hours, but at a method for calculating the design hours of a 3D printed pallet that marks the location, type and quantity of spot welding. This calculation method is different from the previous process drawing marking method and the rough estimation method of the pallet design hours.

[0084] The present invention has a clear calculation process, a method for disassembling the body-in-white welding assembly, and setting the spot welding welding card design difficulty coefficient and welding complexity coefficient according to the vehicle model level. The above steps are indispensable to the present invention, so as to ensure its practicality.

[0085] The present invention provides another embodiment, a spot welding pallet design time calculation system, comprising:

[0086] The vehicle model level determination module is used to determine the vehicle model level and determine the trial production vehicle model level based on project planning and vehicle model positioning;

[0087] BIW trial production data locking module, used to obtain BIW trial production data and BOM;

[0088] The disassembly module is used to disassemble the body-in-white into primary welding assemblies according to the welding assembly; disassemble each primary welding assembly into multiple secondary welding assemblies; further split into smaller third-level and fourth-level welding assemblies according to the different welding complexity; and design welding process cards for each welding assembly;

[0089] The difficulty coefficient calculation method module is used to set the difficulty coefficient of spot welding pallet design;

[0090] The calculation module is used to calculate the working hours of sub-assembly welding pallets and the total working hours.

[0091] Based on the above-mentioned method for calculating the design time of spot welding pallet, the present invention provides another device, which includes but is not limited to: one or more processors and memories.

[0092] The memory, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions corresponding to the method for calculating the design time of the spot welding welding pallet in the embodiment of the present invention. The processor executes various functional applications and data processing of the vehicle by running the software programs, instructions and modules stored in the memory, that is, realizing the above-mentioned method for calculating the design time of the spot welding welding pallet.

[0093] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0094] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, a method for calculating the design time of a spot welding welding pallet is implemented. The method for calculating the design time of a spot welding welding pallet comprises the following steps:

[0095] Step 1: Determine the vehicle model level and determine the trial model level based on project planning and vehicle model positioning;

[0096] Step 2: Obtain body-in-white trial production data and BOM;

[0097] Step 3: Disassemble the body-in-white into multiple first-level welding assemblies according to the welding assembly; disassemble each first-level welding assembly into multiple second-level sub-assemblies; and further disassemble them into third-level, fourth-level, fifth-level and other welding assemblies according to the different welding complexity;

[0098] Step 4: Design welding process cards according to each welding assembly;

[0099] Step five, calculate the difficulty coefficient, and set the spot welding pallet design difficulty coefficients to J1, J2...Jm, where Jm = basic spot welding pallet design difficulty coefficient*Km, where m = 1, 2...n.

[0100] Step 6: Calculate the man-hours for welding pallets of the first-level assembly; multiply the difficulty coefficient of spot welding and welding pallets of each welding sub-assembly by the corresponding basic man-hours to obtain the design man-hours Tm for spot welding and welding pallets of each first-level welding assembly;

[0101] Step 7: Calculate the total working hours and enter the total working hours calculation formula

[0102]

[0103] Among them, m=1, 2…n.

[0104] The computer-readable storage medium provided by the present invention has computer-executable instructions that are not limited to the method operations described above, but can also execute related operations in the method for calculating the design time of spot welding pallets provided by any embodiment of the present invention.

[0105] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0106] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (for example, coaxial cable, optical fiber, digital subscriber line DSL) or wireless (for example, infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid-state hard disk Solid State Disk, SSD), etc.

[0107] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A method for calculating the design time of a spot welding pallet, characterized in that: The following steps are involved: Step 1: Determine the vehicle model level and determine the trial model level based on project planning and vehicle model positioning; Step 2: Obtain body-in-white trial production data and BOM; Step 3: Disassemble the body-in-white into several first-level welding assemblies according to the welding assembly; disassemble each first-level welding assembly into multiple second-level welding assemblies; and further disassemble them into third-level and fourth-level welding assemblies according to the different welding complexity; Step 4: Design welding process cards according to each welding assembly; Step 5, calculate the difficulty coefficient, set the design difficulty coefficient of each spot welding pallet to J1, J2...Jm, where Jm = basic spot welding pallet design difficulty coefficient * Km, where m = 1, 2...n; Km is the complexity coefficient of each welding assembly relative to the basic spot welding assembly; Step 6. Calculation of the man-hours for the welding pallets of the first-level welding assembly: multiply the difficulty coefficient of the spot welding and welding pallets of each first-level welding assembly by the corresponding basic man-hours to obtain the design man-hours Tm for the spot welding and welding pallets of each first-level welding assembly; Step 7: Calculate the total working hours and enter the total working hours calculation formula Wherein, m=1, 2…n, n is a natural number; Tm represents the design man-hours for spot welding of welding pallets for each first-level welding assembly of the basic vehicle model; Jm represents the design difficulty coefficient of spot welding pallet.

2. A method for calculating the design time of a spot welding pallet according to claim 1, characterized in that: In step one, the vehicle types are divided into A00, A, B, and C classes.

3. A method for calculating the design time of a spot welding pallet according to claim 1, characterized in that: In step three, the body in white is disassembled into several primary welding assemblies according to the welding assembly, including the engine hood welding assembly, the front door welding assembly, the rear door welding assembly, the top cover welding assembly, the left side panel welding assembly, the right side panel welding assembly, the back door welding assembly, and the floor assembly.

4. A method for calculating the design time of a spot welding pallet according to claim 1, characterized in that: In step 4, welding process cards are designed for each welding assembly respectively; mainly based on the existing spot welding equipment, personnel and site objective conditions, the spot welding procedures and plans of each welding sub-assembly are reasonably designed, and the number of spot welds of each assembly is counted.

5. A method for calculating the design time of a spot welding pallet according to claim 1, characterized in that: In step 5, the greater the proportion of Km in each sub-assembly under the first-level welding assembly, the greater the Jm value.

6. A method for calculating the design time of a spot welding pallet according to claim 1, characterized in that: In step six, the design working hours for spot welding and welding pallets of each level of welding assembly are accumulated to form the design working hours for spot welding and welding pallets of each first-level welding assembly; the total working hours are the accumulation of the design working hours for spot welding and welding pallets of each first-level welding assembly.

7. A method for calculating the design time of a spot welding pallet according to claim 1, characterized in that: It also includes: Step 8, multiplying the third-party designer's hourly rate by the total working hours to obtain the outsourced development fee.

8. A spot welding pallet design time calculation system, characterized in that: include: The vehicle model level determination module is used to determine the vehicle model level and determine the trial production vehicle model level based on project planning and vehicle model positioning; BIW trial production data locking module, used to obtain BIW trial production data and BOM; The disassembly module is used to disassemble the body-in-white into the first-level welding assembly according to the welding assembly; disassemble each first-level welding assembly into multiple second-level welding assemblies; further split into third-level and fourth-level welding assemblies according to the different welding complexity; design welding process cards according to each welding assembly; Difficulty coefficient calculation module, used to set the difficulty coefficient of spot welding pallet design; Calculation module, used for calculation of first-level assembly welding pallet man-hours and total man-hours.

9. A device, characterized in that: comprising one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

Images