A method, system and storage medium for determining the baking temperature limit of a covering part
By quantitatively determining the lower limit of the baking temperature of aluminum plates during the coating electrophoresis process, the problems of high difficulty and cost in equipment modification were solved, resulting in a reduction in production energy consumption and cost, and ensuring the performance requirements of automotive aluminum alloy body panels.
Patent Information
- Application Number
- CN202111073137.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-09-14
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2041-09-14
AI Technical Summary
In the existing technology for applying 6xxx series aluminum sheets to automotive body panel coating electrophoresis, the increased baking temperature requirements lead to greater difficulty in equipment modification and increased production costs. Furthermore, high-temperature baking unnecessarily increases the yield strength of the material, and there is a lack of a quantitative method for determining the lower limit of the temperature.
By testing the bake-hardening properties of aluminum plates at different baking temperatures, the lower limit of the temperature required to meet the yield strength requirements after electrophoresis coating of aluminum alloy cover parts is quantitatively determined. A method, system and storage medium for determining the baking temperature limit of cover parts are adopted, including an initial condition determination module, a test module and a comparison module. Tests and comparisons are conducted using an electronic universal tensile testing machine and a baking oven.
This reduces production energy consumption and equipment modification difficulty, improves production economy, and ensures that parts performance meets requirements while reducing production costs.
Smart Images
Figure CN113868760B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of automobile manufacturing processes, and particularly relates to a method, a system and a storage medium for determining the baking temperature limit of covering parts. Background Art
[0002] Generally, the production process of an automobile includes stamping, welding, painting and final assembly. The main links of the painting process include degreasing, phosphating, electrocoating, intermediate coat baking and topcoat baking, etc. Among them, links such as electrocoating, intermediate coat baking and topcoat baking need to be carried out at a sufficient temperature, and the electrocoating link has the highest working temperature.
[0003] In view of the characteristics of the painting process, baking hardening steel is often used in combination with automobile steel covering parts, such as H180, etc. The initial yield strength of the baking hardening steel is relatively low, which is easy to stamp and form. During painting, after a certain period of high-temperature baking in the electrocoating link, the yield strength is greatly improved, thereby overall improving the part performance of the final covering part. Generally, the corresponding baking temperature and time of the baking hardening steel are 170°C + 20 min.
[0004] Under the trend of automobile lightweighting, aluminum alloy, as the first choice of lightweight alloy materials, is increasingly used in automobiles. As a kind of aluminum alloy, 6xxx series aluminum plates are often used in automobile outer covering parts, such as front and rear covers, doors, fenders and other parts.
[0005] The 6xxx series aluminum plates also have the characteristics of baking hardening. In the industry, it is generally considered that when the baking temperature and time are 185°C + 20 min, the optimal baking hardening performance of the 6xxx series aluminum plates can be exerted. However, after switching from baking hardening steel to 6xxx series aluminum plates, the increase in the required baking temperature is often restricted by the inability of the original equipment to achieve it, or the greatly increased difficulty of equipment transformation. At the same time, the higher baking temperature also increases the production cost.
[0006] It is found in actual product development that the yield strength of the material after electrocoating baking only needs to reach a certain value or above, and there is no need to increase it to the maximum achievable yield strength. Therefore, there must be an optimal baking temperature and baking time that can reduce production energy consumption while meeting the part performance requirements, and then reduce the production cost. Summary of the Invention
[0007] Aiming at the deficiencies of the prior art, the present invention proposes a method, a system and a storage medium for determining the baking temperature limit of covering parts, aiming to quantitatively determine the lower limit of the baking temperature that can meet the baking hardening performance requirements of aluminum alloy covering parts after electrocoating by testing the baking hardening performance of aluminum plates at different baking temperatures, so as to more accurately set the baking temperature parameters during the electrocoating production of automobile aluminum alloy covering parts. The determination of the lower limit of the baking temperature reduces the production energy consumption and the difficulty of equipment transformation, and improves the economy of production.
[0008] The present invention is realized through the following technical solutions:
[0009] A method for determining the baking temperature limit of a panel, comprising the following steps:
[0010] S101. Determine the lower limit value R p0.2(B)min of the yield strength that needs to be guaranteed for the aluminum plate material after electrophoretic baking, the safety value R, and the production beat t;
[0011] S102. Select the commonly used baking temperature T1 in the industry standard as the initial baking temperature, and conduct a baking hardening test on the aluminum plate specimen after 2% pre-stretching at a temperature of T1 and a production beat of t;
[0012] S103. Conduct a room-temperature static tension on the aluminum plate specimen after the baking hardening test, and measure the yield strength R p0.2(B) ;
[0013] S104. Judge: If the yield strength R p0.2(B) > R p0.2(B)min + R, then reduce the initial baking temperature T1 to T2 (T2 is less than T1), and repeat the above process; by continuously reducing the baking temperature T n of the baking hardening test, and repeating the above process until the yield strength R p0.2(B) ≤ R p0.2(B)min + R;
[0014] S105. At this time, determine the lower limit of the baking hardening temperature of the aluminum plate as T n-1 .
[0015] Preferably, in step S101, R p0.2(B)min) and the safety value R are the lowest yield strengths that can ensure the passing of the simulated collision test input after the vehicle body CAE collision analysis; the production beat t is a fixed value input from the painting site.
[0016] Preferably, in step S101, the lower limit value R p0.2(B)min of the yield strength is greater than 150 MPa, the safety value R is 0 MPa - 20 MPa, and the production beat is 10 min - 30 min.
[0017] Preferably, in steps S102 and S104, the baking temperature range is 165°C - 205°C.
[0018] Preferably, in step S104, the reduction amplitude of the baking temperature is 0.5°C - 2°C each time.
[0019] In a second aspect, the present invention provides a system for determining the baking temperature limit of a panel, including:
[0020] An initial condition determination module determines and inputs the lower limit of the required yield strength, safety value, and production cycle information by combining the vehicle body CAE collision analysis results and the feedback data of the painting production line.
[0021] A test module is used to perform pre-stretching treatment, baking treatment, and mechanical property testing of the sheet specimen after baking, and feed back the test results at the corresponding temperature.
[0022] A comparison module is used to compare the test results fed back by the test module with the initial conditions, and determine whether to output the results or enter the next cycle to continue calling the test module.
[0023] Preferably, the initial condition determination module is implemented by computer software and hardware, can directly read the vehicle body CAE collision simulation results, and input the production cycle production information manually.
[0024] Preferably, the test module includes:
[0025] An electronic universal tensile testing machine is used for pre-stretching and mechanical property testing of the sheet specimen after baking. The rated load of the universal tensile testing machine needs to be ≥5 tons.
[0026] An oven is used for simulating baking of the sheet specimen. The upper limit of the available temperature of the oven should reach at least 300 °C, and the temperature accuracy reaches 0.5 °C.
[0027] A test result feedback unit inputs the test results into the comparison module.
[0028] Preferably, the comparison module is implemented by computer software and hardware, is used to compare the test results fed back by the test module with the initial conditions, and determine whether to output the results or enter the next cycle to continue calling the test module, and finally output the determined baking temperature limit.
[0029] In a third aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the method for determining the baking temperature limit of the covering part as described above.
[0030] Compared with the prior art, the advantages of the present invention are as follows:
[0031] The present invention provides a method, system, and storage medium for determining the baking temperature limit of a covering part. By testing the baking hardening performance of an aluminum sheet at different baking temperatures, the lower limit of the baking temperature that can meet the baking hardening performance requirements after electrophoresis coating of an aluminum alloy covering part is quantitatively determined, so as to more accurately set the baking temperature parameters during the production of electrophoresis coating of automotive aluminum alloy covering parts.
[0032] During the actual production process, the lower limit of the baking hardening temperature finally determined in the present invention is directly set as the electrophoretic baking temperature of the painting production line. While meeting the performance requirements of the parts, the production energy consumption and production cost are reduced to the greatest extent, and even the engineering transformation or equipment replacement caused by excessive baking temperature requirements is avoided, improving the economic efficiency of production. Brief Description of the Drawings
[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual scale.
[0034] Figure 1 It is a flowchart of a method for determining the baking temperature limit for electrophoretic coating of automotive aluminum alloy body panels in the present invention. Detailed Embodiments
[0035] To clearly and completely describe the technical solutions of the present invention and their specific working processes, in combination with the drawings in the specification, the detailed embodiments of the present invention are as follows:
[0036] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0037] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.
[0038] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0039] Embodiment 1
[0040] A method for determining the baking temperature limit for electrophoretic coating of automotive aluminum alloy body panels includes the following steps:
[0041] S101. Determine the lower limit of the yield strength to be guaranteed as 200 MPa, the safety value as 5 MPa, and the production cycle as 20 min for the aluminum alloy plate with the grade of 6016 - T4P - 1.0 mm after electrophoretic baking.
[0042] S102. Select the recommended baking temperature of 185 °C in the industry standard as the initial baking temperature, and conduct a baking hardening test on the aluminum alloy plate specimen after 2% pre - stretching under the condition of 185 °C + 20 min.
[0043] S103. Conduct a room - temperature static tension test on the aluminum alloy plate specimen after the baking hardening test, and measure the yield strength R p0.2(B) ;
[0044] S104. Judge: If the yield strength R p0.2(B) > 205 MPa, then reduce the baking temperature of 185 °C to 184 °C (reduce by 1 °C each time), and repeat the above process; by continuously reducing the baking temperature T n °C of the baking hardening test, and repeating the above process until the yield strength R p0.2(B) ≤ 205 MPa;
[0045] S105. At this time, determine the lower limit of the baking hardening temperature of this aluminum alloy plate as T n-1 °C.
[0046] Table 1 is a performance data record table for the process of determining the baking temperature limit in this embodiment. It can be seen that when the baking temperature is reduced to 179 °C, the yield strength after baking is 204.2 MPa, which is lower than R p0.2(B)min + R, and it cannot meet the performance requirements of the parts. Therefore, the baking temperature limit of the aluminum alloy plate is determined to be 180 °C, and the electrophoretic baking temperature of the aluminum alloy body panel using this aluminum alloy plate should be set to 180 °C.
[0047] Table 1 Record Table of Performance Data in the Process of Determining the Baking Temperature Limit
[0048]
[0049] In this embodiment, the baking temperature limit of the aluminum plate is finally determined, and it supports the reduction of the baking temperature setting of the electrophoretic production line for automotive aluminum alloy coverings from 185 °C to 180 °C, reducing production energy consumption and production costs.
[0050] Example 2
[0051] A method for determining the baking temperature limit for painting and electrophoresis of automotive aluminum alloy coverings, comprising the following steps:
[0052] S101. Determine the lower limit value of the yield strength to be guaranteed at 180 MPa, the safety value at 10 MPa, and the production beat at 20 min for the aluminum plate with the grade 6014-T4P-1.2mm after electrophoretic baking;
[0053] S102. Select the recommended baking temperature of 185 °C in the industry standard as the initial baking temperature, and conduct a baking hardening test on the aluminum plate specimen after 2% pre-stretching under the condition of 185 °C + 20 min;
[0054] S103. Conduct a room-temperature static tension on the aluminum plate specimen after the baking hardening test, and measure the yield strength R p0.2(B) ;
[0055] S104. Judge: If the yield strength R p0.2(B) > 190 MPa, then reduce the baking temperature of 185 °C to 184 °C (reduce by 1 °C each time), and repeat the above process; by continuously reducing the baking temperature T n °C of the baking hardening test, and repeating the above process until the yield strength R p0.2(B) ≤ 190 MPa;
[0056] S105. At this time, determine the lower limit of the baking hardening temperature of the aluminum plate as T n-1 °C.
[0057] Table 2 is the record table of performance data in the process of determining the baking temperature limit of this embodiment. It can be seen that when the baking temperature drops to 180 °C, the yield strength after baking is 189.5 MPa, which is lower than R p0.2(B)min +R and cannot meet the part performance requirements. Therefore, the baking temperature limit of the aluminum plate is determined to be 181 °C, and the electrophoretic baking temperature of the aluminum alloy covering using this aluminum plate should be set to 181 °C.
[0058] Table 2 Record Table of Performance Data in the Process of Determining the Baking Temperature Limit
[0059]
[0060] In this embodiment, the baking temperature limit of the aluminum plate is finally determined, and it supports the reduction of the baking temperature setting of the electrophoretic production line for automotive aluminum alloy body panels from 185 °C to 181 °C, reducing production energy consumption and production costs.
[0061] Example 3
[0062] A method for determining the baking temperature limit for painting and electrophoresis of automotive aluminum alloy body panels, comprising the following steps:
[0063] S101. Determine the lower limit value of the yield strength to be guaranteed, which is 210 MPa, the safety value of 5 MPa, and the production cycle time of 15 min for the 6A16-T4P-0.95 mm aluminum plate after electrophoretic baking;
[0064] S102. Select the recommended baking temperature of 185 °C in the industry standard as the initial baking temperature, and conduct a baking hardening test on the aluminum plate specimen after 2% pre-stretching under the condition of 185 °C + 15 min;
[0065] S103. Conduct a room-temperature static tension on the aluminum plate specimen after the baking hardening test, and measure the yield strength R p0.2(B) ;
[0066] S104. Judge: If the yield strength R p0.2(B) > 215 MPa, then reduce the baking temperature of 185 °C to 184 °C (reduce by 1 °C each time), and repeat the above process; by continuously reducing the baking temperature T n °C of the baking hardening test, and repeat the above process until the yield strength R p0.2(B) ≤ 215 MPa;
[0067] S105. At this time, determine the lower limit of the baking hardening temperature of this aluminum plate as T n-1 °C.
[0068] Table 3 is a performance data record form for the process of determining the baking temperature limit in this embodiment. It can be seen that when the baking temperature is reduced to 181 °C, the yield strength after baking is 204.2 MPa, which is lower than R p0.2(B)min + R and cannot meet the performance requirements of the parts. Therefore, the baking temperature limit of the aluminum plate is determined to be 182 °C, and the electrophoretic baking temperature of the aluminum alloy body panel using this aluminum plate should be set to 182 °C.
[0069] Table 3 Performance data record form for the process of determining the baking temperature limit
[0070]
[0071] In this embodiment, the baking temperature limit of the aluminum plate is finally determined, which supports the reduction of the baking temperature setting of the electrophoretic production line for automotive aluminum alloy body panels from 185°C to 182°C, reducing production energy consumption and production costs.
[0072] Example 4
[0073] Example 4 of the present invention provides a system for determining the baking temperature limit of body panels, including:
[0074] An initial condition determination module, which determines and inputs the lower limit of the required yield strength, safety value, and production beat information by combining the vehicle body CAE collision analysis results and the feedback data of the painting production line;
[0075] A test module, which is used to perform pre-stretching treatment, baking treatment, and mechanical property testing of the plate specimen after baking, and feedback the test results at the corresponding temperature;
[0076] A comparison module, which is used to compare the test results feedback by the test module with the initial conditions, and determine whether to output the results, or enter the next cycle and continue to call the test module.
[0077] The initial condition determination module is implemented by computer software and hardware, can directly read the vehicle body CAE collision simulation results, and input the production beat production information manually.
[0078] The test module includes:
[0079] An electronic universal tensile testing machine, which is used for pre-stretching and mechanical property testing of the plate specimen after baking. The rated load of the universal tensile testing machine needs to be ≥5 tons;
[0080] An oven, which is used for simulating the baking of the plate specimen. The upper limit of the available temperature of the oven should reach at least 300°C, and the temperature accuracy reaches 0.5°C;
[0081] A test result feedback unit, which inputs the test results into the comparison module.
[0082] The comparison module is implemented by computer software and hardware, and is used to compare the test results feedback by the test module with the initial conditions, and determine whether to output the results, or enter the next cycle and continue to call the test module, and finally output the determined baking temperature limit.
[0083] Example 5
[0084] Embodiment 5 of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements a method for determining the baking temperature limit for painting electrophoresis of automotive aluminum alloy body panels provided in all embodiments of the present application: aiming to quantitatively determine the lower limit of the baking temperature that can meet the baking hardening performance requirements after painting electrophoresis of aluminum alloy body panels by testing the baking hardening performance of aluminum plates at different baking temperatures, so as to more accurately set the baking temperature parameters during the production of painting electrophoresis of automotive aluminum alloy body panels.
[0085] One or more arbitrary combinations of computer-readable media can be adopted. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, apparatus, or device.
[0086] The computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which the computer-readable program code is carried. Such a propagated data signal can take various forms, including - but not limited to - electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and this computer-readable medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device.
[0087] The program code contained on the computer-readable medium can be transmitted by any suitable medium, including - but not limited to - wireless, wire, optical cable, RF, etc., or any suitable combination of the above.
[0088] Computer program code for performing the operations of the present invention may be written in one or more programming languages or combinations thereof, including object-oriented programming languages such as Java, Smalltalk, C++, and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).
[0089] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0090] In addition, it should be noted that, in the case of no conflict, the various specific technical features described in the above specific embodiments may be combined in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination manners.
[0091] Furthermore, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.
Claims
1. A method for determining the baking temperature limit of a covering part, characterized in that, Including the following steps: S101. Determine the lower limit value R of the yield strength guaranteed by the material requirements of the aluminum plate after electrophoresis baking p0.2(B)min , safety value R, and production cycle t; S102. Select the commonly used baking temperature T1 in the industry standard as the initial baking temperature, and conduct a baking hardening test on the aluminum plate specimen pre-stretched by 2% under the conditions of a temperature of T1 and a production beat of t; S103. Perform room-temperature static tension on the aluminum plate specimen after the bake hardening test, and measure the yield strength R p0.2(B) ; S104. Judgment: If the yield strength R p0.2(B) > R p0.2(B)min + R, then reduce the initial baking temperature T1 to T2, and repeat the above process; by continuously reducing the baking temperature T of the bake hardening test n , and repeat the above process until the yield strength R p0.2(B) ≤ R p0.2(B)min + R; S105. At this time, determine that the lower limit of the baking hardening temperature of the aluminum plate is T n-1 .
2. The method for determining the baking temperature limit of a covering member according to claim 1, characterized in that, In step S101, R p0.2(B)min) and the safety value R are the minimum yield strengths input after the vehicle's CAE crash analysis and capable of ensuring the passing of the simulated crash test; the production rhythm t is a fixed value input on the painting site.
3. The method for determining the baking temperature limit of a covering part according to claim 1, characterized in that, In step S101, the lower limit value R of the yield strength p0.2(B)min is greater than 150 MPa, the safety value R is 0 MPa - 20 MPa, and the production cycle is 10 min - 30 min.
4. The method for determining the baking temperature limit of a covering part according to claim 1, characterized in that, In steps S102 and S104, the baking temperature range is 165°C - 205°C.
5. The method for determining the baking temperature limit of a covering part according to claim 1, characterized in that, In step S104, the reduction amplitude of the baking temperature is reduced by 0.5°C - 2°C each time.
6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements a method for determining the baking temperature limit of the covering part as described in any one of claims 1 - 5.