Method for improving dimensional stability of ultra-high-strength steel cold stamping forming part

Abstract

The invention discloses a method for improving the dimensional stability of an ultra-high-strength steel cold stamping forming part, which comprises the following steps: S1, acquiring different optimal production parameters corresponding to parts produced by adopting ultra-high-strength steel materials with different performance intervals, constructing a production parameter database based on the performance interval information and the optimal production parameters of the ultrahigh-strength steel material; and S2, performance interval information of the ultrahigh-strength steel material provided by production is obtained, the optimal production parameters matched with the performance interval information are automatically selected from the production parameter database according to the performance interval information, and then parts are produced according to the selected optimal production parameters. According to the method, the optimal production parameters can be automatically selected from the production parameter database along with the change of the material performance of the ultrahigh-strength steel material during part production, so that the part production is not influenced by the material performance fluctuation of each supply, the production efficiency is improved, the stability of the part size is ensured, the part qualification rate is improved, and the production cost is reduced. And the rejection rate of materials and parts is reduced.

Description

Technical Field

[0001] The invention relates to the field of production of ultra-high strength steel cold stamping parts, and in particular to a method for improving the dimensional stability of ultra-high strength steel cold stamping parts. Background Art

[0002] Automobile safety has always been the focus of consumers. With the rapid development of new energy vehicles, improving the strength of the vehicle body is the development trend of the industry. However, increasing the thickness of parts to improve the strength of the vehicle body will increase the weight of the vehicle body, which is very unfavorable to the endurance of new energy vehicles. Therefore, how to improve the strength of the vehicle body and reduce the weight of the vehicle body has been the focus of the new energy vehicle industry in recent years.

[0003] In order to reduce the weight of parts and improve their strength, domestic and foreign material manufacturers have been continuously developing higher-strength cold stamping materials to improve the strength of parts without increasing the thickness of parts, thereby improving the strength of the entire vehicle; however, the improvement of part strength also brings greater challenges to production, such as:

[0004] 1. Ultra-high strength steel has a high yield strength, and the springback of parts is much higher than that of ordinary strength and high strength steel, which places high demands on mold manufacturing, debugging and stability;

[0005] 2. The performance of ultra-high-strength steel materials fluctuates greatly, with a yield strength range of about 300Mpa, which causes the performance of the materials to fluctuate each time they are supplied, affecting the dimensional stability of the parts and, in turn, the size of the entire vehicle;

[0006] 3. Due to the fluctuation of material properties, the dimensions of parts produced are prone to unqualified problems, which requires a lot of time and manpower to investigate and solve the problems, resulting in low production efficiency and a high scrap rate of parts.

[0007] Therefore, in the face of the above-mentioned problems, developing a method that can improve the dimensional stability of ultra-high strength steel cold stamping parts is a technical problem that needs to be solved urgently. Summary of the invention

[0008] The purpose of the present invention is to provide a method for improving the dimensional stability of ultra-high strength steel cold stamping parts, so as to solve the problem of poor dimensional stability of existing ultra-high strength steel cold stamping parts.

[0009] In order to solve the above technical problems, the present invention provides a method for improving the dimensional stability of ultra-high strength steel cold stamping parts, comprising the steps of:

[0010] S1: Obtain different optimal production parameters corresponding to the production of parts using ultra-high strength steel materials in different performance ranges, and build a production parameter database based on the performance range information and optimal production parameters of the ultra-high strength steel materials;

[0011] S2: Obtain the performance range information of the ultra-high strength steel material provided by production, automatically select the optimal production parameters matching the performance range information from the production parameter database, and then produce parts according to the selected optimal production parameters.

[0012] Further, in step S1, the methods for obtaining different optimal production parameters include:

[0013] S11: Collect ultra-high strength steel materials in different performance ranges; obtain the molds for producing parts;

[0014] S12: Use the molds to conduct production debugging and verification on ultra-high strength steel materials in different performance ranges, and obtain different optimal production parameters corresponding one by one to the performance range information of different ultra-high strength steel materials.

[0015] Further, the mold is a mold with part springback compensation.

[0016] Further, as Figure 2 shown, the method for obtaining the mold includes:

[0017] S111: Conduct precise springback calculation on the part according to the Autoform software, confirm the optimal springback compensation plan for the part, and form mold processing data;

[0018] S112: Manufacture the mold according to the mold processing data;

[0019] S113: Grind the manufactured mold to the set state.

[0020] Further, step S12 specifically includes:

[0021] S121: Select the ultra-high strength steel material in one of the performance ranges, and obtain the performance range information of the ultra-high strength steel material;

[0022] S122: Adjust the production parameters on the mold, and after verifying that the dimensions of the parts produced according to the production parameters meet the product tolerance requirements, take the qualified production parameters as the optimal production parameters;

[0023] S123: Repeat steps S121 and S122 until all the ultra-high strength steel materials collected are debugged and verified, and obtain different optimal production parameters corresponding one by one to the performance range information of different ultra-high strength steel materials.

[0024] Further, each ultra-high strength steel material in each performance range is respectively configured with a material code, and each material code corresponds to a performance range information.

[0025] Furthermore, a material code is set on the ultra-high strength steel material; when producing parts, the performance range information of the ultra-high strength steel material to be processed is obtained by scanning the material code.

[0026] Furthermore, the method further includes:

[0027] Collect the die information of the die and store the die information in the production parameter database;

[0028] When producing parts, obtain the performance range information and die information of the ultra-high strength steel material provided according to the production plan; and automatically select the optimal production parameters that match the die information and performance range information from the production parameter database according to the performance range information and die information, and then produce parts according to the selected optimal production parameters.

[0029] Furthermore, each die is respectively configured with a different die code, and each die code corresponds to a die information.

[0030] Furthermore, the die code is set on the die; when producing parts, the die information of the die is obtained by scanning the die code.

[0031] Furthermore, when producing parts, the produced parts are inspected, and after passing the inspection, the batch production part program is started.

[0032] The beneficial effects of the present invention are:

[0033] 1. By first determining the optimal production parameters corresponding to ultra-high strength steel materials in different performance ranges and constructing a production parameter database, when producing parts subsequently, the optimal production parameters can be automatically selected from the production parameter database with the change of the material performance of the ultra-high strength steel material during part production, making the part production not affected by the material performance fluctuations of each supply, not only improving the production efficiency, but also ensuring the dimensional stability of the parts, enhancing the part qualification rate, and reducing the material and part scrap rate.

[0034] 2. By adopting a die that takes into account part springback compensation, the adaptability of die production to material performance fluctuations can be effectively improved, the debugging time can be reduced, and the production efficiency of parts can be improved.

[0035] 3. This method can not only automatically adjust the optimal production parameters with the change of the material performance of the ultra-high strength steel material, but also automatically adjust the optimal production parameters according to different dies and different ultra-high strength steel materials when different dies are needed to produce different parts, which can effectively improve the production efficiency. Description of the Drawings

[0036] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The same reference numerals are used to represent the same or similar parts in these drawings. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0037] Figure 1 is a flowchart of the steps of a method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel provided by an embodiment of the present invention;

[0038] Figure 2 is a schematic flowchart of the precise calculation of part springback provided by an embodiment of the present invention;

[0039] Figure 3 is a schematic flowchart of constructing a production parameter database provided by an embodiment of the present invention;

[0040] Figure 4 is a schematic flowchart of producing parts according to the production parameter database provided by an embodiment of the present invention. Detailed implementation manners

[0041] As Figure 1 shown, the present invention discloses a method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel, including the steps of:

[0042] S1: Obtain different optimal production parameters corresponding to parts produced from ultra-high strength steel materials in different performance ranges, and construct a production parameter database based on the performance range information of the ultra-high strength steel materials and the optimal production parameters;

[0043] S2: Obtain the performance range information of the ultra-high strength steel materials provided for production, automatically select the optimal production parameters matching the performance range information from the production parameter database according to the performance range information, and then produce parts according to the selected optimal production parameters.

[0044] By first determining the optimal production parameters corresponding to ultra-high strength steel materials in different performance ranges, when producing parts subsequently, it is possible to automatically select the optimal production parameters from the production parameter database as the material properties of the ultra-high strength steel materials change during part production, so that part production is not affected by the fluctuations in the material properties of each supply. This not only improves production efficiency but also ensures the dimensional stability of parts, improves the qualification rate of parts, and reduces the scrap rate of materials and parts. Moreover, when dimensional problems occur in the produced parts, it is also possible to trace the problems based on the data in the production parameter database to determine which link among the ultra-high strength steel materials, molds, or production parameters causes the problem, directly reaching the problem point, which is conducive to quickly solving the problem and improving the problem-solving efficiency.

[0045] According to an embodiment of the present application, in step S1, the method for obtaining different optimal production parameters includes:

[0046] S11: Collect ultra-high strength steel materials in different performance ranges; obtain the molds for producing parts;

[0047] The properties of the ultra-high strength steel materials include yield strength, tensile strength, and elongation after fracture. Taking the yield strength as an example, the ultra-high strength steel materials can be collected in one gear according to every 50 MPA yield strength, and each gear corresponds to a performance range. In addition, the ultra-high strength steel materials in different performance ranges can be purchased from different suppliers. By using the ultra-high strength steel materials from different manufacturers as samples, the supply risk and high price problem caused by exclusive materials can be reduced;

[0048] S12: Use the molds to carry out production debugging and verification on the ultra-high strength steel materials in different performance ranges, and obtain different optimal production parameters corresponding one by one to the performance range information of different ultra-high strength steel materials.

[0049] When only producing one type of part, since the molds for producing the same type of parts are the same, only the performance fluctuations of the ultra-high strength steel materials need to be considered when automatically selecting the optimal formula later. Therefore, when producing parts, it is possible not to obtain the mold information of the molds and directly obtain the optimal production parameters corresponding to different performance range information.

[0050] According to an embodiment of the present application, the mold is a mold with part springback compensation. During the production process of stamping parts, there will be a springback phenomenon in which the size and shape change due to elastic recovery of the material after removing the forming load. The springback phenomenon directly affects the final dimensional accuracy and shape of the product, and may cause deviations between the stamping parts and the design digital model. In this embodiment, by adopting a mold with part springback compensation, the influence of the mold on the size and shape of the parts can be effectively reduced or eliminated, thereby improving the quality and qualification rate of the stamping parts.

[0051] According to an embodiment of the present application, the method for obtaining the molds includes:

[0052] S111: Carry out precise springback calculation on the parts according to the Autoform software, confirm the optimal springback compensation plan for the parts, and form mold processing data; as Figure 2 shown, when using the Autoform software to carry out precise springback calculation on the parts, set the free springback and the springback supported by the RPS points of the inspection fixture according to the inspection fixture attitude, check the springback calculation results, and select the optimal springback compensation plan for the parts according to the software analysis results. After compensation, ensure that the analysis results are within the following tolerance ranges:

[0053] Free springback: -1 mm ≤ free springback ≤ +1 mm;

[0054] Fixture RPS point support springback: -0.2mm ≤ springback (RPS point) ≤ +0.2mm; -0.4mm ≤ springback (critical position) ≤ +0.4mm; -0.5mm ≤ springback (90% area) ≤ +0.5mm;

[0055] After the springback accurate calculation of the part meets the requirements, the die processing data is formed; it should be noted that the springback accurate calculation of the part by the Autoform software is the prior art, so this part will not elaborate too much on the specific springback accurate calculation process;

[0056] S112: Manufacture the die according to the die processing data;

[0057] S113: Grind the manufactured die to the set state; for example, set the set state as: grind to a die clearance less than 0.1mm; to ensure the fluidity and forming effect of the material during stamping, make the dimensions of the stamped part accurate, reduce the subsequent trimming or grinding work, not only save costs, but also shorten the production cycle and improve the overall work efficiency.

[0058] According to an embodiment of the present application, step S12 specifically includes:

[0059] S121: Select the ultra-high-strength steel material in one of the performance ranges, and obtain the performance range information of the ultra-high-strength steel material;

[0060] S122: Adjust the production parameters (stamping speed, pressure, lubrication conditions, etc.) on the die, and after verifying that the dimensions of the parts produced according to the production parameters meet the product tolerance requirements, use the qualified production parameters as the optimal production parameters;

[0061] S123: Repeat steps S121 and S122 until all the ultra-high-strength steel materials collected are debugged and verified, and obtain different optimal production parameters corresponding one by one to the performance range information of different ultra-high-strength steel materials. Then save the different performance range information and different optimal production parameters in the production parameter database one by one respectively, as Figure 3 shown.

[0062] According to an embodiment of the present application, each ultra-high-strength steel material in each performance range is respectively configured with a material code, and each material code corresponds to a performance range information. When collecting ultra-high-strength steel materials in different performance ranges, the material codes can be configured for the ultra-high-strength steel materials in different performance ranges at the same time.

[0063] In this embodiment, by setting a material code, the system automatically matches the performance range information according to the material code and automatically retrieves the optimal production parameters, which can effectively reduce the work complexity, reduce the possibility of errors in the process of material information transmission, and facilitate the processing, analysis, and verification of material information. The material code can be a two-dimensional code or a bar code.

[0064] According to an embodiment of the present application, the material code is set on the ultra-high strength steel material; when producing parts, the performance range information of the ultra-high strength steel material to be processed is obtained by scanning the material code. The method of obtaining the performance range information of the ultra-high strength steel material by automatically scanning the material code can not only improve the degree of production automation but also prevent the leakage of production parameters to a certain extent.

[0065] In this embodiment, the method of obtaining the performance range information of the ultra-high strength steel material by automatically scanning the material code can not only facilitate material management and improve the degree of production automation but also prevent the leakage of production parameters to a certain extent.

[0066] According to an embodiment of the present application, the method further includes:

[0067] Collecting the die information of the die and storing the die information in the production parameter database;

[0068] When producing parts, obtaining the performance range information and die information of the ultra-high strength steel material provided according to the production plan; and automatically selecting the optimal production parameters that match the die information and performance range information from the production parameter database according to the performance range information and die information, and then producing parts according to the selected optimal production parameters.

[0069] When different parts need to be produced, different parts require different dies and corresponding different production parameters. In this embodiment, by introducing the die information of the die, the method can not only automatically adjust the optimal production parameters according to the change of the material performance of the ultra-high strength steel material, but also automatically adjust the optimal production parameters according to different dies and different ultra-high strength steel materials when different parts need to be produced using different dies, which can support flexible production of multiple dies and multiple material combinations and meet the requirements of mass production of multiple parts.

[0070] According to an embodiment of the present application, each die is respectively configured with a different die code, and each die code corresponds to a die information. Similarly, the die code can also be a two-dimensional code or a bar code.

[0071] According to an embodiment of the present application, the mold code is set on the mold; when producing parts, the mold information of the mold is obtained by scanning the mold code. The method of obtaining mold information by automatically scanning the mold code can not only improve the degree of production automation, but also prevent the leakage of production parameters to a certain extent by humans.

[0072] When producing parts, as Figure 4 shown, according to the part production plan, prepare the mold and materials in advance. Before production, scan the mold code and the code of the material to be processed, identify the corresponding performance range of this batch of materials, and automatically select the corresponding production parameters. After the above settings are completed, conduct the first-piece production inspection of the parts. After passing the inspection, start the batch production program of the parts. Inspect 3-5 continuously produced products before batch production. Only after passing the inspection can the subsequent products be processed continuously. At the same time, conduct spot checks during the process, which can detect the factors affecting product quality in the production process as early as possible, ensure the quality of the parts, and prevent batch defects or scrapping.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel, characterized in that, Including the steps: S1: Obtain different optimal production parameters corresponding to parts produced from ultra-high strength steel materials in different performance ranges, and construct a production parameter database based on the performance range information and optimal production parameters of the ultra-high strength steel materials; S2: Obtain the performance range information of the ultra-high strength steel materials provided for production, automatically select the optimal production parameters matching the performance range information from the production parameter database according to the performance range information, and then produce parts according to the selected optimal production parameters.

2. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 1, characterized in that, In the step S1, the method for obtaining the different optimal production parameters includes: S11: Collect ultra-high strength steel materials in different performance ranges; obtain the molds for producing parts; S12: Conduct production debugging and verification on the ultra-high strength steel materials in different performance ranges using the molds to obtain different optimal production parameters corresponding one by one to the performance range information of different ultra-high strength steel materials.

3. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 2, wherein The mold is a mold with part springback compensation.

4. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 3, characterized in that, The method for obtaining the mold includes: S111: Conduct precise springback calculation on the part according to Autoform software, confirm the optimal springback compensation scheme for the part, and form mold processing data; S112: Manufacture the mold according to the mold processing data; S113: Grind the manufactured mold to the set state.

5. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to any one of claims 2-4, characterized in that, The step S12 specifically includes: S121: Select the ultra-high strength steel material in one of the performance ranges and obtain the performance range information of the ultra-high strength steel material; S122: Adjust the production parameters on the mold, and after verifying that the dimensions of the parts produced according to the production parameters meet the product tolerance requirements, use the qualified production parameters as the optimal production parameters; S123: Repeat steps S121 and S122 until all the collected ultra-high strength steel materials are debugged and verified, and obtain different optimal production parameters corresponding one by one to the performance range information of different ultra-high strength steel materials.

6. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 2, wherein Each ultra-high strength steel material in each performance range is respectively configured with a material code, and each material code corresponds to a performance range information.

7. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 6, characterized in that The material code is set on the ultra-high strength steel material; when producing parts, the performance range information of the ultra-high strength steel material to be processed is obtained by scanning the material code.

8. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 6 or 7, characterized in that, This method further includes: Collect the mold information of the mold and store the mold information in the production parameter database; When producing parts, obtain the performance range information and mold information of the ultra-high strength steel materials provided according to the production plan; and automatically select the optimal production parameters matching the mold information and performance range information from the production parameter database according to the performance range information and mold information, and then produce parts according to the selected optimal production parameters.

9. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 8, characterized in that, Each of the molds is respectively configured with a different mold code, and each mold code corresponds to a mold information.

10. The method for improving the dimensional stability of cold stamping formed parts of ultra-high strength steel according to claim 9, characterized in that, The mold code is set on the mold; when producing parts, the mold information of the mold is obtained by scanning the mold code.

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