High-strength steel stamping part size precision control method and system

Abstract

The application discloses a high-strength steel stamping part size precision control method, which comprises the following steps: collecting actual mechanical property data of part processing raw materials; determining a correction coefficient based on reference mechanical property data and the actual mechanical property data of the part processing raw materials; adjusting the blank holder force and the sizing time of the stamping part based on the correction coefficient; and performing stamping part processing by using the adjusted blank holder force and the sizing time. The application can effectively solve the problem of part size precision control difficulty when the performance of different batches of high-strength steel materials fluctuates.

Description

Technical Field

[0001] This invention relates to a control method and system, and more particularly to a part processing control method and system. Background Technology

[0002] With the rapid development of the automotive industry, high-strength steel, due to its high strength, can achieve the effects of lightweighting and carbon reduction, and is widely used in body structural components and safety components.

[0003] However, as the strength increases, the application problems also become more and more prominent, mainly manifested in the difficulty of controlling the size of the parts, easy to scratch, and many edge cracking problems.

[0004] Among them, the control of part dimensional accuracy is the main obstacle affecting the application of high-strength steel plates due to factors such as large fluctuations in material properties between different batches and fluctuations in stamping process parameters.

[0005] To address the challenge of dimensional control, the industry currently employs a method of performing a certain degree of mold surface compensation during mold surface processing.

[0006] This method can reduce part dimensional springback to some extent, thereby improving part dimensional accuracy. However, since the die surface is compensated in a single machining operation, this method cannot effectively control part dimensional accuracy for each batch of material with varying properties. Summary of the Invention

[0007] The purpose of this invention is to provide a method for controlling the dimensional accuracy of high-strength steel stamped parts, which can effectively solve the problem of difficulty in controlling the dimensional accuracy of parts when the performance of high-strength steel materials fluctuates in different batches.

[0008] To achieve the above objectives, this invention proposes a method for controlling the dimensional accuracy of high-strength steel stamped parts, comprising the following steps:

[0009] Collect actual mechanical property data of incoming parts for processing;

[0010] The correction factor is determined based on the baseline mechanical property data and the actual mechanical property data of the incoming parts.

[0011] Based on the correction coefficient, adjust the blank holder force and forming time of the stamped parts;

[0012] The stamped parts are processed using the adjusted blank holder force and forming time.

[0013] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts described in this invention, the actual mechanical property data includes the actual yield strength Yp. i Actual tensile strength Ts i and the actual work hardening index ni The correction factors include yield strength correction factor a1, tensile strength correction factor b1, and work hardening correction factor c1.

[0014] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts described in this invention, the yield strength correction coefficient a1 is determined based on the following formula: a1=(Yp i -Yp0) / Yp0, where Yp0 represents the reference yield strength, which is the yield strength of the high-strength steel used in the development and debugging of stamping dies.

[0015] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts described in this invention, the tensile strength correction coefficient b1 is determined based on the following formula: b1=(Ts i -Ts0) / Ts0, where Ts0 represents the reference tensile strength, which is the yield strength of the high-strength steel used in the development and debugging of stamping dies.

[0016] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention, the work hardening correction coefficient c1 is determined based on the following formula: c1=(n i -n0) / n0, where n0 represents the baseline work hardening index, which is the work hardening index of the high-strength steel used in the development and debugging of stamping dies.

[0017] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention, adjusting the blank holder force of the stamped parts based on the correction coefficient includes the following steps:

[0018] The adjusted blank holder force Fb is obtained based on the following formula: Fb=F0+F0(a1-c1)×α, where F0 represents the initial design blank holder force and α represents the variation factor.

[0019] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts described in this invention, the variation factor α ranges from 0.45 to 1.25.

[0020] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts described in this invention:

[0021] When the reference tensile strength is ≤600MPa, the variation factor α ranges from 0.45 to 0.55.

[0022] When 600MPa < reference tensile strength ≤ 800MPa, the range of the variation factor α is 0.75 to 0.85;

[0023] When 800MPa < reference tensile strength ≤ 1000MPa, the value range of the variation factor α is 0.95 to 1.05;

[0024] When 1000MPa < reference tensile strength ≤ 1200MPa, the range of the variation factor α is 1.15 to 1.25.

[0025] Furthermore, in the method for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention, adjusting the forming time of the stamped parts based on the correction coefficient includes the following steps:

[0026] The adjusted shaping time is obtained based on the following formula: Tk = T0 × (b1 × c1), where T0 represents the initial design shaping time.

[0027] Furthermore, the method for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention further includes the following steps: obtaining the blank holder force difference rate δ = (Fb-F0) / F0 based on the adjusted blank holder force Fb and the initial design blank holder force F0; comparing the blank holder force difference rate δ with a set threshold; if the blank holder force difference rate δ ≥ the set threshold, then updating the initial design blank holder force to a new blank holder force F0', F0' = β × F0, and updating the initial design forming time to a new initial design forming time T0', T0' = β × T0, where β is an adjustment coefficient, and its value ranges from 1 to 1.5; if the blank holder force difference rate δ is less than the set threshold, then updating the initial design blank holder force to the adjusted blank holder force Fb, and updating the initial design forming time to the adjusted forming time Tk.

[0028] Another objective of this invention is to provide a dimensional accuracy control system for high-strength steel stamped parts, which can effectively solve the problem of difficulty in controlling the dimensional accuracy of parts when the performance of high-strength steel materials fluctuates between different batches.

[0029] To achieve the above objectives, this invention proposes a dimensional accuracy control system for high-strength steel stamped parts, which implements the dimensional accuracy control method for high-strength steel stamped parts described above. The dimensional accuracy control system for high-strength steel stamped parts includes:

[0030] The data acquisition module collects the actual mechanical property data of the incoming parts for processing;

[0031] The control module determines correction coefficients based on the actual mechanical performance data and the stored benchmark mechanical performance data; and adjusts the blank holder force and forming time of the stamped parts based on the correction coefficients.

[0032] The execution unit uses adjusted blank holder force and forming time to process stamped parts.

[0033] The method and system for controlling the dimensional accuracy of high-strength steel stamped parts described in this invention can dynamically adjust the process parameters during the stamping process based on the actual performance of the incoming material, thereby solving the problem of difficulty in controlling the dimensional accuracy of parts. Attached Figure Description

[0034] Figure 1 The flowchart illustrates the steps of one embodiment of the method for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention.

[0035] Figure 2 The diagram shows a structural block diagram of the high-strength steel stamping part dimensional accuracy control system according to one embodiment of the present invention. Detailed Implementation

[0036] The method and system for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. However, this explanation and description do not constitute an improper limitation on the technical solution of the present invention.

[0037] Figure 1 The flowchart illustrates the steps of one embodiment of the method for controlling the dimensional accuracy of high-strength steel stamped parts according to the present invention.

[0038] like Figure 1 As shown, in some embodiments, the present invention proposes a method for controlling the dimensional accuracy of high-strength steel stamped parts, which includes the following steps:

[0039] 100: Collect actual mechanical property data of the incoming parts for machining. In some more specific implementations, the actual mechanical property data includes the actual yield strength Yp. i Actual tensile strength Ts i and the actual work hardening index n i .

[0040] 200: The correction factor is determined based on the baseline mechanical property data and the actual mechanical property data of the incoming material for part processing. The baseline mechanical property data refers to the mechanical property data of the high-strength steel used in the development and debugging of the stamping die. Accordingly, in some more specific embodiments, the baseline mechanical property data includes the baseline yield strength Yp0, the baseline tensile strength Ts0, and the baseline work hardening index n0.

[0041] In some specific implementations, the correction factors include a1 for yield strength, b1 for tensile strength, and c1 for work hardening. Wherein:

[0042] The yield strength correction factor a1 can be determined based on the following formula: a1=(Yp i -Yp0) / Yp0.

[0043] The tensile strength correction factor b1 can be determined based on the following formula: b1=(Ts i -Ts0) / Ts0.

[0044] The work hardening correction factor c1 can be determined based on the following formula: c1=(n i -n0) / n0.

[0045] Tables 1 and 2 respectively list two specific examples of determining correction coefficients based on actual mechanical property data of incoming parts and reference mechanical property data.

[0046] Table 1.

[0047]

[0048]

[0049] Table 2.

[0050]

[0051] 300: Based on the above correction coefficient, adjust the blank holder force and forming time of the stamped parts.

[0052] In some more specific embodiments, the adjusted blank holder force Fb can be obtained based on the following formula: Fb=F0+F0(a1-c1)×α, where F0 represents the initial design blank holder force, α represents the variation factor, and the variation factor α ranges from 0.45 to 1.25. Those skilled in the art can select the value of the variation factor within this range according to actual needs.

[0053] In some more specific implementations:

[0054] When the reference tensile strength is ≤600MPa, the variation factor α ranges from 0.45 to 0.55.

[0055] When 600MPa < reference tensile strength ≤ 800MPa, the range of the variation factor α is 0.75 to 0.85;

[0056] When 800MPa < reference tensile strength ≤ 1000MPa, the value range of the variation factor α is 0.95 to 1.05;

[0057] When 1000MPa < reference tensile strength ≤ 1200MPa, the range of the variation factor α is 1.15 to 1.25.

[0058] Table 3 lists the values ​​of the change factor in a specific example.

[0059] Table 3.

[0060] Ts0(MPa) α ≤600 0.5 600-800 0.8 800-1000 1 1000-1200 1.2

[0061] In some more specific implementations, the adjusted shaping time can be obtained based on the following formula: Tk = T0 × (b1 × c1), where T0 represents the initial design shaping time.

[0062] 400: Stamping parts are processed using adjusted blank holder force and forming time.

[0063] In some preferred embodiments, in order to achieve self-optimization and self-learning of the control system, step 500 may be included after step 400:

[0064] The difference rate of the blank holder force δ = (Fb-F0) / F0 is obtained based on the adjusted blank holder force Fb and the initial design blank holder force F0.

[0065] The blank holder force difference rate δ is compared with a set threshold: if the blank holder force difference rate δ ≥ the set threshold, the initial design blank holder force is updated to a new blank holder force F0', F0' = β × F0, and the initial design forming time is updated to a new initial design forming time T0', T0' = β × T0, where β is an adjustment coefficient, and its value ranges from 1 to 1.5. Those skilled in the art can select the value of β within this range as needed. Generally speaking, the larger the blank holder force difference rate δ, the larger the value within this range. For example, in a specific instance, the value of β is 1.2. If the blank holder force difference rate δ is less than the set threshold, the initial design blank holder force is updated to the adjusted blank holder force Fb, and the initial design forming time is updated to the adjusted forming time Tk.

[0066] In some more specific implementations, the threshold can be set to 15% to 25%. For example, in one specific instance, the threshold can be set to 20%.

[0067] In another embodiment of the present invention, a dimensional accuracy control system for high-strength steel stamped parts is provided, which is implemented as described above in the dimensional accuracy control method for high-strength steel stamped parts.

[0068] Figure 2 The diagram shows a structural block diagram of the high-strength steel stamping part dimensional accuracy control system according to one embodiment of the present invention.

[0069] like Figure 2 As shown, in some embodiments, the dimensional accuracy control system for high-strength steel stamped parts may include:

[0070] Data acquisition module 101 collects the actual mechanical property data of the incoming parts for processing;

[0071] The control module 102 determines a correction coefficient based on the actual mechanical property data of the incoming part and the stored reference mechanical property data; and adjusts the blank holder force and forming time of the stamped part based on the correction coefficient.

[0072] The execution unit 103 uses adjusted blank holder force and forming time to process stamped parts.

[0073] It should be noted that, in this invention, the data acquisition module 101 and the control module 102 can be implemented in any suitable manner. For example, they can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) that can be executed by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320.

[0074] Furthermore, those skilled in the art will recognize that, besides implementing the controller using purely computer-readable program code, the method steps can be logically programmed to enable the modules to perform the same function in the form of logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), and embedded microcontrollers. Therefore, such a module can be considered a hardware component, and the devices included within it for implementing various functions can also be considered structures within that hardware component. Alternatively, the devices for implementing various functions can be considered as both software modules implementing the method and structures within a hardware component.

[0075] The execution unit of the present invention can be an existing execution unit that receives and executes part processing control, such as a host computer.

[0076] Therefore, the high-strength steel stamping parts dimensional accuracy control method and system described in this invention can dynamically adjust the process parameters during the stamping process based on the actual performance of the incoming material, thereby solving the problem of difficult dimensional accuracy control of parts. It reduces the debugging cycle of parts processing and is especially suitable for intelligent operation in the industry.

[0077] It should be noted that the combination of the technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0078] Furthermore, it should be noted that the above examples are merely specific embodiments of the present invention, and the present invention is obviously not limited to these embodiments, with many similar variations possible. All modifications that can be directly derived or conceived by those skilled in the art from the disclosure of this invention should fall within the protection scope of this invention.

Claims

1. A method for controlling the dimensional accuracy of high-strength steel stamped parts, characterized in that, Including the following steps: Collect actual mechanical property data of incoming parts for processing; The correction factor is determined based on the baseline mechanical property data and the actual mechanical property data of the incoming parts. Based on the correction coefficient, adjust the blank holder force and forming time of the stamped parts; The stamped parts are processed using the adjusted blank holder force and forming time.

2. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 1, characterized in that, The actual mechanical performance data includes the actual yield strength Yp i Actual tensile strength Ts i and the actual work hardening index n i The correction factors include yield strength correction factor a1, tensile strength correction factor b1, and work hardening correction factor c1.

3. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 2, characterized in that, The yield strength correction factor a1 is determined based on the following formula: a1=(Yp i -Yp0) / Yp0, where Yp0 represents the reference yield strength.

4. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 2, characterized in that, The tensile strength correction factor b1 is determined based on the following formula: b1=(Ts i -Ts0) / Ts0, where Ts0 represents the reference tensile strength.

5. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 2, characterized in that, The work hardening correction factor c1 is determined based on the following formula: c1=(n i -n0) / n0, where n0 represents the baseline work hardening index.

6. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 2, characterized in that, Adjusting the blank holder force of the stamped part based on the correction coefficient includes the following steps: The adjusted blank holder force Fb is obtained based on the following formula: Fb=F0+F0(a1-c1)×α, where F0 represents the initial design blank holder force and α represents the variation factor.

7. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 6, characterized in that, The value range of the variation factor α is 0.45 to 1.

25.

8. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 7, characterized in that: When the reference tensile strength is ≤600MPa, the variation factor α ranges from 0.45 to 0.

55. When 600MPa < reference tensile strength ≤ 800MPa, the value range of the variation factor α is 0.75 to 0.85; When 800MPa < reference tensile strength ≤ 1000MPa, the range of the variation factor α is 0.95 to 1.05; When 1000MPa < reference tensile strength ≤ 1200MPa, the range of the variation factor α is 1.15 to 1.

25.

9. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in claim 2, characterized in that, Adjusting the forming time of stamped parts based on the correction coefficient includes the following steps: The adjusted shaping time is obtained based on the following formula: Tk = T0 × (b1 × c1), where T0 represents the initial design shaping time.

10. The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in any one of claims 1-9, characterized in that, The method also includes the following steps: obtaining the blank holder force difference rate δ = (Fb - F0) / F0 based on the adjusted blank holder force Fb and the initial design blank holder force F0; comparing the blank holder force difference rate δ with a set threshold; if the blank holder force difference rate δ ≥ the set threshold, then updating the initial design blank holder force to a new blank holder force F0', F0' = β × F0, and updating the initial design shaping time to a new initial design shaping time T0', T0' = β × T0, where β is an adjustment coefficient, and its value ranges from 1 to 1.5; if the blank holder force difference rate δ is less than the set threshold, then updating the initial design blank holder force to the adjusted blank holder force Fb, and updating the initial design shaping time to the adjusted shaping time Tk.

11. A dimensional accuracy control system for high-strength steel stamped parts, characterized in that, The method for controlling the dimensional accuracy of high-strength steel stamped parts as described in any one of claims 1-10, wherein the control system for the dimensional accuracy of high-strength steel stamped parts includes: The data acquisition module collects the actual mechanical property data of the incoming parts for processing; The control module determines a correction coefficient based on the actual mechanical performance data and the stored benchmark mechanical performance data; based on the correction coefficient, it adjusts the blank holder force and forming time of the stamped part; the execution unit processes the stamped part using the adjusted blank holder force and forming time.

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