Design method of automobile covering part mold

Abstract

The invention relates to the technical field of automobile mold design, in particular to an automobile covering part mold design method which comprises the following steps: S1, part feature analysis and data acquisition; s2, preliminarily designing a mold structure; s3, performing simulation analysis on the stamping process; s4, the mold structure is optimally designed; s5, mold manufacturing and debugging; through accurate part feature analysis, comprehensive data acquisition and advanced simulation analysis and optimization algorithms, the mold design can more accurately meet the forming requirements of the automobile covering part, the precision of the covering part formed by the mold is improved, the repeated modification and mold testing times caused by unreasonable design are reduced, the design period is shortened, and the production cost is reduced. And the research and development speed of new automobile products is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile mold design, in particular to a design method for an automobile covering part mold. Background Art

[0002] In automotive manufacturing, the design quality of panel molds has a critical impact on a vehicle's appearance, performance, and production efficiency. Traditional automotive panel mold design methods suffer from numerous drawbacks. First, the design process relies heavily on experience, with designers primarily determining mold structure and parameters based on past experience with similar projects, lacking precise theoretical models. This makes it difficult to quickly and accurately develop a reasonable design plan for new, complex panel designs, significantly extending the design cycle. Second, traditional design simulations of the mold forming process are insufficiently comprehensive and accurate. Most methods simply consider the basic mechanical properties of the material, ignoring the complex changes in material properties during the actual stamping process due to factors such as temperature and strain rate. For example, under traditional methods, when stamping high-strength steel panels, the mold design often fails to effectively control part springback due to insufficient consideration of the material's hardening properties. This results in large deviations in dimensional accuracy after part forming and high scrap rates, severely impacting the cost and efficiency of automotive production. Therefore, a design method for automotive panel molds is proposed. Summary of the Invention

[0003] In view of this, the present invention provides a design method for an automobile panel mold to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0004] The technical solution of the present invention is achieved as follows: A method for designing a mold for an automobile cover comprises the following steps:

[0005] S1, part feature analysis and data collection;

[0006] S2. Preliminary design of mold structure;

[0007] S3, stamping process simulation analysis;

[0008] S4. Optimization design of mold structure;

[0009] S5. Mould manufacturing and debugging.

[0010] Further preferably, in said S1, the design model of the automobile cover is accurately scanned using three-dimensional scanning technology to obtain complete three-dimensional data of the part surface with a scanning accuracy of ±0.05mm, clearly capturing the subtle shape features of the part surface, providing basic shape information for subsequent mold design, and collecting detailed mechanical properties data of the material used for the cover, including yield strength, tensile strength, elongation, hardening index, etc., and collecting performance change data of the material at different temperatures and strain rates, so as to more realistically reflect the material behavior in subsequent simulation analysis.

[0011] Further preferably, in said S2, according to the shape and size of the cover, professional mold design software is used to make preliminary planning of the overall structure of the mold. During the design, the general standards and empirical criteria for mold design are followed to preliminarily determine the type of mold. For covers with relatively simple shapes and large batches, single-process mold design is given priority to reduce mold manufacturing costs. The shapes and sizes of the main components of the mold, such as the punch, die, and blank holder, are preliminarily designed. Taking the punch as an example, reverse design is performed according to the shape of the inner surface of the cover to ensure that the fitting accuracy between the punch and the inner surface of the cover is within ±0.1mm. At the same time, based on the material flow and molding process requirements, the radius of the die corner is preliminarily determined to be 6-8mm, and the blank holder force range of the blank holder is set to 500-800kN.

[0012] Further preferably, in said S3, an accurate simulation model of the stamping process is constructed with the aid of finite element analysis software, the material performance data and mold structure parameters collected previously are accurately input into the model, reasonable boundary conditions and loading methods are set, and the simulated stamping speed is set to 5-10m / s, which is close to the stamping speed range in actual production. A comprehensive simulation analysis is performed on the material flow, stress-strain distribution, and springback phenomena during the stamping process. The simulation results output a thickness change cloud map, stress-strain distribution map, and final springback data of the material at different stamping stages, so as to intuitively understand the forming condition of the cover during the stamping process and provide a basis for the optimization of the mold structure.

[0013] Further preferably, in said S4, based on the simulation analysis results, an optimization algorithm is used to optimize and adjust the mold structure parameters. Taking the radius of the die corner as an example, a genetic algorithm is used to search for the optimal value within the range of 6-10 mm, with minimizing the springback of the cover as the objective function. After multiple rounds of iterative calculations, it is finally determined that when the radius of the die corner is 8.5 mm, the springback of the cover can be reduced to 1.2 mm. The key components of the mold are topologically optimized and designed. While ensuring the strength and rigidity of the mold, the weight of the mold is reduced. Through optimized design, the mold improves the economy and production efficiency while ensuring the molding quality.

[0014] Further preferably, in said S5, the mold is manufactured based on the optimized mold design drawings using advanced processing technology. During the processing, the processing accuracy is strictly controlled, and the tolerance of key dimensions is controlled within ±0.03mm. After the mold is manufactured, a trial mold is debugged. By collecting the dimensional data, surface quality data, etc. of the stamping parts during the trial mold process and comparing and analyzing them with the design requirements, problems that arise are adjusted and optimized in a timely manner. After 3-5 trial mold debuggings, the mold can stably produce automobile covering parts that meet the design requirements, thereby meeting the quality requirements of automobile production.

[0015] Further preferably, the stamping pressure F required in the stamping process is one of the key parameters of the die design, which can be expressed by the formula: F = KLtτ b Calculation, where K is the coefficient, L is the punch perimeter length, t is the material thickness, τ b is the shear strength of the material.

[0016] Furthermore, springback is a common problem after stamping of automotive panels. Estimation of the springback amount Δ is extremely important for the design of die surface compensation. For simple bending parts, the empirical formula can be used:

[0017]

[0018] Where K1 and K2 are coefficients related to the bending shape and mold structure, E is the elastic modulus of the material, σ y is the yield strength of the material, and t is the thickness of the material.

[0019] The embodiment of the present invention adopts the above technical solution, which has the following advantages:

[0020] 1. Through precise part feature analysis, comprehensive data collection, and advanced simulation analysis and optimization algorithms, the present invention enables mold design to more accurately meet the molding requirements of automotive panels, improves the precision of molded panels, reduces repeated modifications and mold trials due to unreasonable design, shortens the design cycle, and greatly improves the research and development speed of new automotive products.

[0021] 2. Effectively control the defects of cover parts during the stamping process, reduce the scrap rate, reduce production costs, and improve the economic benefits of the enterprise. Through topological optimization and reasonable structural design of key components of the mold, the mold weight is reduced while ensuring mold performance, reducing the wear and fatigue damage of the mold during use, and extending the service life of the mold.

[0022] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0025] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, an embodiment of the present invention provides a method for designing a mold for an automobile panel, comprising the following steps:

[0028] S1, part feature analysis and data collection;

[0029] S2. Preliminary design of mold structure;

[0030] S3, stamping process simulation analysis;

[0031] S4. Optimization design of mold structure;

[0032] S5. Mould manufacturing and debugging.

[0033] In one embodiment, in S1, 3D scanning technology is used to accurately scan the design model of the automobile cover to obtain complete 3D data of the part surface with a scanning accuracy of ±0.05mm. The subtle shape features of the part surface are clearly captured, providing basic shape information for subsequent mold design. The mechanical properties data of the material used for the cover are collected in detail, including yield strength, tensile strength, elongation, hardening index, etc. The performance change data of the material at different temperatures and strain rates are collected to more realistically reflect the material behavior in subsequent simulation analysis.

[0034] In one embodiment, in S2, according to the shape and size of the cover, professional mold design software is used to make preliminary planning of the overall structure of the mold. During the design, the general standards and empirical criteria for mold design are followed to preliminarily determine the type of mold. For covers with relatively simple shapes and large batches, single-process mold design is given priority to reduce mold manufacturing costs. The shapes and sizes of the main components of the mold, such as the punch, die, and blank holder, are preliminarily designed. Taking the punch as an example, reverse design is performed according to the shape of the inner surface of the cover to ensure that the fitting accuracy between the punch and the inner surface of the cover is within ±0.1mm. At the same time, based on the material flow and molding process requirements, the radius of the die corner is preliminarily determined to be 6-8mm, and the blank holder force range of the blank holder is set to 500-800kN.

[0035] In one embodiment, in S3, a precise simulation model of the stamping process is constructed with the help of finite element analysis software, the previously collected material performance data and mold structure parameters are accurately input into the model, reasonable boundary conditions and loading methods are set, and the simulated stamping speed is set to 5-10m / s, which is close to the stamping speed range in actual production. The material flow, stress-strain distribution, and springback phenomena in the stamping process are comprehensively simulated and analyzed. The simulation results output the thickness change cloud map, stress-strain distribution map, and final springback data of the material in different stamping stages, so as to intuitively understand the forming condition of the cover during the stamping process and provide a basis for the optimization of the mold structure.

[0036] In one embodiment, in S4, based on the simulation analysis results, the optimization algorithm is used to optimize and adjust the mold structure parameters. Taking the radius of the die corner as an example, the genetic algorithm is used to search for the optimal value within the range of 6-10 mm, with minimizing the springback of the cover as the objective function. After multiple rounds of iterative calculations, it is finally determined that when the radius of the die corner is 8.5 mm, the springback of the cover can be reduced to 1.2 mm. The key components of the mold are topologically optimized and designed. While ensuring the strength and rigidity of the mold, the weight of the mold is reduced. Through optimized design, the mold improves the economy and production efficiency while ensuring the molding quality.

[0037] In one embodiment, in S5, the mold is manufactured using advanced processing technology based on the optimized mold design drawings. During the processing, the processing accuracy is strictly controlled, and the key dimensional tolerance is controlled within ±0.03mm. After the mold is manufactured, a trial mold is debugged. By collecting the dimensional data and surface quality data of the stamping parts during the trial mold process and comparing them with the design requirements, problems that arise are adjusted and optimized in a timely manner. After 3-5 trial mold debuggings, the mold can stably produce automobile covering parts that meet the design requirements and meet the quality requirements of automobile production.

[0038] In one embodiment, the punching pressure F required during the punching process is one of the key parameters of the die design and can be expressed by the formula: F = KLtτ b Calculation, where K is the coefficient, L is the punch perimeter length, t is the material thickness, τ b is the shear strength of the material.

[0039] In one embodiment, springback is a common problem after stamping of automotive panels. The estimation of springback Δ is extremely important for the design of die surface compensation. For simple bending parts, the empirical formula can be used:

[0040]

[0041] Where K1 and K2 are coefficients related to the bending shape and mold structure, E is the elastic modulus of the material, σ y is the yield strength of the material, and t is the thickness of the material.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications and substitutions within the technical scope disclosed in the present invention, and such modifications and substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A design method for an automobile panel mold, characterized by: The following steps are involved: S1, part feature analysis and data collection; S2. Preliminary design of mold structure; S3, stamping process simulation analysis; S4. Optimization design of mold structure; S5. Mould manufacturing and debugging.

2. The method for designing a mold for an automobile panel according to claim 1, characterized in that: In S1, 3D scanning technology is used to accurately scan the design model of the automobile cover to obtain complete 3D data of the part surface with a scanning accuracy of ±0.05mm. The subtle shape features of the part surface are clearly captured, providing basic shape information for subsequent mold design. Detailed mechanical properties data of the material used for the cover are collected, including yield strength, tensile strength, elongation, hardening index, etc., and performance change data of the material at different temperatures and strain rates are collected to more realistically reflect material behavior in subsequent simulation analysis.

3. The method for designing a mold for an automobile panel according to claim 1, characterized in that: In said S2, according to the shape and size of the cover, professional mold design software is used to make preliminary planning of the overall structure of the mold. During the design, the general standards and empirical criteria for mold design are followed to preliminarily determine the type of mold. For covers with relatively simple shapes and large batches, single-process mold design is given priority to reduce mold manufacturing costs. The shapes and sizes of the main components of the mold, such as the punch, die, and blank holder, are preliminarily designed. Taking the punch as an example, reverse design is performed according to the shape of the inner surface of the cover to ensure that the fitting accuracy between the punch and the inner surface of the cover is within ±0.1mm. At the same time, based on the material flow and molding process requirements, the radius of the die corner is preliminarily determined to be 6-8mm, and the blank holder force range of the blank holder is set to 500-800kN.

4. The method for designing a mold for an automobile panel according to claim 1, characterized in that: In the S3, a precise simulation model of the stamping process is constructed with the help of finite element analysis software, the previously collected material performance data and mold structure parameters are accurately input into the model, reasonable boundary conditions and loading methods are set, and the simulated stamping speed is set to 5-10m / s, which is close to the stamping speed range in actual production. The material flow, stress-strain distribution, and springback phenomena in the stamping process are comprehensively simulated and analyzed. The simulation results output the thickness change cloud map, stress-strain distribution map, and final springback data of the material in different stamping stages, so as to intuitively understand the forming condition of the cover during the stamping process and provide a basis for the optimization of the mold structure.

5. The method for designing a mold for an automobile panel according to claim 1, characterized in that: In said S4, based on the simulation analysis results, the optimization algorithm is used to optimize and adjust the mold structure parameters. Taking the die corner radius as an example, the genetic algorithm is used to search for the best value within the range of 6-10mm, with minimizing the springback of the cover as the objective function. After multiple rounds of iterative calculations, it is finally determined that when the die corner radius is 8.5mm, the springback of the cover can be reduced to 1.2mm. The key components of the mold are topologically optimized and designed. While ensuring the strength and rigidity of the mold, the weight of the mold is reduced. Through optimized design, the mold improves the economy and production efficiency while ensuring the molding quality.

6. The method for designing a mold for an automobile panel according to claim 1, characterized in that: In the S5, the mold is manufactured based on the optimized mold design drawings using advanced processing technology. During the processing, the processing accuracy is strictly controlled, and the key dimensional tolerance is controlled within ±0.03mm. After the mold is manufactured, the mold is tested and debugged. By collecting the dimensional data and surface quality data of the stamping parts during the mold trial process and comparing them with the design requirements, the problems that arise are adjusted and optimized in a timely manner. After 3-5 mold trials and debugging, the mold can stably produce automobile covering parts that meet the design requirements and meet the quality requirements of automobile production.

7. The method for designing a mold for an automobile panel according to claim 1, characterized in that: The stamping pressure F required in the stamping process is one of the key parameters in die design and can be calculated by the formula: F = KLtτ b Calculation, where K is the coefficient, L is the punch perimeter length, t is the material thickness, τ b is the shear strength of the material.

8. The method for designing a mold for an automobile panel according to claim 1, characterized in that: Springback is a common problem after stamping automobile panels. Estimation of the springback amount Δ is extremely important for the design of die surface compensation. For simple bending parts, the empirical formula can be used: Where K1 and K2 are coefficients related to the bending shape and mold structure, E is the elastic modulus of the material, σ y is the yield strength of the material, and t is the thickness of the material.

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