Design method of automobile covering part mold

Abstract

The invention relates to the technical field of automobile die production, in particular to an automobile covering part die design method. According to the method, a virtual three-dimensional model containing sub-parts is constructed according to the geometric structure of the automobile covering part, then a finite element CAD digital model is established, a compensation coefficient is determined, first compensation of the finite element CAD digital model is carried out, second compensation is carried out on the basis of the first compensation, and then parameters of automobile covering part mold design are obtained. And finally, the automobile covering part mold base material is subjected to pretreatment, reprocessing and assembling, and the design of the automobile covering part mold can be completed. According to the method provided by the invention, the curved surface of the mold can be treated and compensated, so that the influence caused by actual mold deformation can be counteracted, the fitting degree of a cavity surface is improved, the debugging period of the mold is shortened, and the manufacturing cost of the mold is reduced.

Description

Technical Field

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

[0002] Automobile covering parts refer to the spatially shaped surface or internal parts made of metal sheets that cover the engine, chassis, and constitute the cab and body.

[0003] When stamping automobile cover parts, the mold needs to ensure that the precision of the stamped cover parts meets the design requirements and the quality is stable. However, during use, the mold will deform unevenly, causing problems such as low precision and unstable quality of the parts. Therefore, how to effectively improve the quality of automobile molds has become an important issue that needs to be urgently solved in my country's automobile mold production and processing industry.

[0004] Therefore, the present invention provides a method for designing a mold for an automobile cover, which is used to solve the above-mentioned related technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method for designing an automobile cover mold. The method provided by the present invention can process the mold surface and perform compensation, which can offset the impact of actual mold deformation, improve the fit of the cavity surface, shorten the mold debugging cycle, and reduce the mold manufacturing cost.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a method for designing a mold for an automobile cover, comprising the following steps:

[0008] S1. Divide the automobile cover into several sub-components according to the geometric structure of the automobile cover, and construct a virtual three-dimensional model containing each sub-component;

[0009] S2. According to the constructed virtual three-dimensional model containing each sub-component, a finite element CAD digital model is established, and a compensation coefficient is determined, and then a first compensation of the finite element CAD digital model is performed based on the compensation coefficient, and then a second compensation is performed based on the first compensation;

[0010] S3. According to the twice-compensated finite element CAD digital model, the design parameters of the automobile cover mold are obtained, the raw material is melted under high temperature and high pressure, and poured into the mold cavity, and hardened to obtain the molded automobile cover mold base material;

[0011] S4. Pre-treat the base material of the automobile cover mold, and then process and assemble it.

[0012] The present invention is further configured as follows: in step S1, the process of constructing a virtual three-dimensional model containing each sub-component is as follows:

[0013] Obtain the basic points of each sub-component and connect adjacent basic points to form a basic three-dimensional model;

[0014] The formed basic three-dimensional model is compared with the geometric structure of the automobile cover, and the corresponding basic point connection lines are adjusted to obtain a virtual three-dimensional model containing various sub-components.

[0015] The present invention is further configured as follows: the basic points include convex points, inflection points and concave points.

[0016] The present invention is further configured as follows: the adjusting of the corresponding basic point connection lines refers to adjusting the connection lines of the basic points so that the curved surface formed by the connection lines of the basic points is smooth and consistent with the geometric structure of the automobile cover.

[0017] The present invention is further configured as follows: in step S2, the calculation formula of the compensation coefficient is:

[0018] ρ = (1 + ΔT × α1) / (1 + ΔT × α2), where ΔT is the difference between room temperature and curing temperature, α1 is the thermal expansion coefficient of the composite material of the automotive cover, and α2 is the thermal expansion coefficient of the mold material.

[0019] The present invention is further configured as follows: in the step S2, the calculation formula for the first compensation of the finite element CAD digital model based on the compensation coefficient is:

[0020] H1=(ρ+1)×H2, where ρ is the compensation coefficient and H2 is the theoretical size of the mold.

[0021] The present invention is further configured as follows: in the step S4, the pretreatment means first using a cleaning agent to clean the automobile cover mold base material for 3 to 4 times, then rinsing it with deionized water for 2 to 4 times, and finally drying it at 30 to 40° C. for 60 to 70 minutes;

[0022] The cleaning agent is made of the following raw materials in parts by weight: 10 to 20 parts of alkali metal salt, 8 to 12 parts of alcohol solvent and 25 to 35 parts of deionized water;

[0023] The preparation process of the cleaning agent is as follows:

[0024] Accurately weigh the alkali metal salt, alcohol solvent and deionized water, and place the alkali metal salt, alcohol solvent and deionized water in a stirrer to mix them thoroughly;

[0025] The material is discharged, and then successively inspected, measured and packaged to finally obtain the finished cleaning agent.

[0026] The present invention is further configured as follows: the alkali metal salt is selected from any one of sodium chloride, sodium sulfate decahydrate, and potassium aluminum sulfate dodecahydrate.

[0027] The present invention is further configured as follows: the alcohol solvent is selected from any one of 2-ethyl-1-butanol, 2-methylcyclohexanol, triethylene glycol, and triethylene glycol monomethyl ether.

[0028] The present invention is further configured as follows: in step S4, the processing process is as follows:

[0029] Use milling machines to mill the base material of automobile cover molds;

[0030] Then use grinding equipment to finely grind the base material of the automobile cover mold to the designed size.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention constructs a virtual three-dimensional model containing various sub-components according to the geometric structure of the automobile cover, and then establishes a finite element CAD digital model, determines the compensation coefficient, performs the first compensation of the finite element CAD digital model, and performs the second compensation based on the first compensation, thereby obtaining the design parameters of the automobile cover mold, obtaining the formed automobile cover mold base material, and finally pre-treating the automobile cover mold base material, and then processing and assembling to complete the design of the automobile cover mold; the method provided by the present invention can process the mold surface and perform compensation, which can offset the influence of actual mold deformation, improve the cavity surface fit, shorten the mold debugging cycle, and reduce the mold manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The present invention is a flow chart of a method for designing a mold for an automobile cover. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, this embodiment provides a method for designing a mold for an automobile cover, comprising the following steps:

[0038] S1. Divide the automobile cover into several sub-components according to the geometric structure of the automobile cover, and construct a virtual three-dimensional model containing each sub-component.

[0039] The process of constructing a virtual three-dimensional model containing various sub-components is as follows:

[0040] Obtain the basic points of each sub-component and connect adjacent basic points to form a basic three-dimensional model;

[0041] The formed basic three-dimensional model is compared with the geometric structure of the automobile cover, and the corresponding basic point connection lines are adjusted to obtain a virtual three-dimensional model containing various sub-components.

[0042] Furthermore, the basic points include convex points, inflection points and concave points.

[0043] Adjusting the corresponding basic point connection lines refers to adjusting the connection lines of the basic points so that the curved surface formed by the connection lines of the basic points is smooth and consistent with the geometric structure of the automobile cover.

[0044] In this embodiment, it should be noted that when constructing a virtual three-dimensional model containing various sub-components, the movement and contact relationship between the various parts of the model can be determined; the basic three-dimensional model is constructed using basic points, and then the preliminary shape of the automobile cover is obtained. In order to reduce the error between the shape of the automobile cover and the actual situation, the corresponding basic point connecting lines will be adjusted to ensure a smooth surface.

[0045] S2. According to the constructed virtual three-dimensional model containing each sub-component, a finite element CAD digital model is established, and a compensation coefficient is determined. Then, a first compensation of the finite element CAD digital model is performed based on the compensation coefficient, and then a second compensation is performed based on the first compensation.

[0046] The calculation formula of the compensation coefficient is:

[0047] ρ = (1 + ΔT × α1) / (1 + ΔT × α2), where ΔT is the difference between room temperature and curing temperature, α1 is the thermal expansion coefficient of the composite material of the automotive cover, and α2 is the thermal expansion coefficient of the mold material.

[0048] The calculation formula for the first compensation of the finite element CAD digital model based on the compensation coefficient is:

[0049] H1=(ρ+1)×H2, where ρ is the compensation coefficient and H2 is the theoretical size of the mold.

[0050] In this embodiment, it should be noted that if the mold material and the composite material of the automobile cover have different thermal expansion coefficients, it will affect the shape and dimensional accuracy of the automobile cover. The thermal expansion of a smaller mold will hardly affect the composite parts. However, if the mold size is too large and the composite parts have important appearance or assembly features, it is necessary to consider the impact of the different thermal expansion coefficients of the composite material and the mold material. Therefore, size compensation is required during the mold design process.

[0051] In addition, the second compensation refers to increasing the size of the automobile cover mold, such as 0.2mm, to facilitate subsequent milling and grinding to ensure the design size.

[0052] S3. According to the twice-compensated finite element CAD digital model, the design parameters of the automobile cover mold are obtained, the raw materials are melted under high temperature and high pressure, and poured into the mold cavity, and hardened to obtain the molded automobile cover mold base material.

[0053] S4. Pre-treat the base material of the automobile cover mold, and then process and assemble it.

[0054] The pretreatment means that the automobile cover mold base material is first cleaned 3 times with a cleaning agent, then rinsed with deionized water 2 times, and finally dried at 30°C for 60 minutes;

[0055] The cleaning agent is made of the following raw materials in parts by weight: 10 parts of alkali metal salt, 8 parts of alcohol solvent and 25 parts of deionized water;

[0056] The preparation process of the cleaning agent is as follows:

[0057] Accurately weigh the alkali metal salt, alcohol solvent and deionized water, and place the alkali metal salt, alcohol solvent and deionized water in a stirrer to mix them thoroughly;

[0058] The material is discharged, and then successively inspected, measured and packaged to finally obtain the finished cleaning agent.

[0059] Furthermore, the alkali metal salt is sodium chloride.

[0060] The alcohol solvent is 2-ethyl-1-butanol.

[0061] In addition, the processing process is as follows:

[0062] Use milling machines to mill the base material of automobile cover molds;

[0063] Then use grinding equipment to finely grind the base material of the automobile cover mold to the designed size.

[0064] In this embodiment, it should be noted that the mold is cleaned with a cleaning agent to ensure that the mold is kept clean after molding, and then processed and assembled to complete the design of the automobile cover mold.

[0065] Embodiment 2:

[0066] like Figure 1 As shown, this embodiment provides a method for designing a mold for an automobile cover, comprising the following steps:

[0067] S1. Divide the automobile cover into several sub-components according to the geometric structure of the automobile cover, and construct a virtual three-dimensional model containing each sub-component.

[0068] The process of constructing a virtual three-dimensional model containing various sub-components is as follows:

[0069] Obtain the basic points of each sub-component and connect adjacent basic points to form a basic three-dimensional model;

[0070] The formed basic three-dimensional model is compared with the geometric structure of the automobile cover, and the corresponding basic point connection lines are adjusted to obtain a virtual three-dimensional model containing various sub-components.

[0071] Furthermore, the basic points include convex points, inflection points and concave points.

[0072] Adjusting the corresponding basic point connection lines refers to adjusting the connection lines of the basic points so that the curved surface formed by the connection lines of the basic points is smooth and consistent with the geometric structure of the automobile cover.

[0073] In this embodiment, it should be noted that when constructing a virtual three-dimensional model containing various sub-components, the movement and contact relationship between the various parts of the model can be determined; the basic three-dimensional model is constructed using basic points, and then the preliminary shape of the automobile cover is obtained. In order to reduce the error between the shape of the automobile cover and the actual situation, the corresponding basic point connecting lines will be adjusted to ensure a smooth surface.

[0074] S2. According to the constructed virtual three-dimensional model containing each sub-component, a finite element CAD digital model is established, and a compensation coefficient is determined. Then, a first compensation of the finite element CAD digital model is performed based on the compensation coefficient, and then a second compensation is performed based on the first compensation.

[0075] The calculation formula of the compensation coefficient is:

[0076] ρ = (1 + ΔT × α1) / (1 + ΔT × α2), where ΔT is the difference between room temperature and curing temperature, α1 is the thermal expansion coefficient of the composite material of the automotive cover, and α2 is the thermal expansion coefficient of the mold material.

[0077] The calculation formula for the first compensation of the finite element CAD digital model based on the compensation coefficient is:

[0078] H1=(ρ+1)×H2, where ρ is the compensation coefficient and H2 is the theoretical size of the mold.

[0079] In this embodiment, it should be noted that if the mold material and the composite material of the automobile cover have different thermal expansion coefficients, it will affect the shape and dimensional accuracy of the automobile cover. The thermal expansion of a smaller mold will hardly affect the composite parts. However, if the mold size is too large and the composite parts have important appearance or assembly features, it is necessary to consider the impact of the different thermal expansion coefficients of the composite material and the mold material. Therefore, size compensation is required during the mold design process.

[0080] In addition, the second compensation refers to increasing the size of the automobile cover mold, such as 0.2mm, to facilitate subsequent milling and grinding to ensure the design size.

[0081] S3. According to the twice-compensated finite element CAD digital model, the design parameters of the automobile cover mold are obtained, the raw materials are melted under high temperature and high pressure, and poured into the mold cavity, and hardened to obtain the molded automobile cover mold base material.

[0082] S4. Pre-treat the base material of the automobile cover mold, and then process and assemble it.

[0083] The pretreatment means that the base material of the automobile cover mold is first cleaned 4 times with a cleaning agent, then rinsed with deionized water 3 times, and finally dried at 35°C for 65 minutes;

[0084] The cleaning agent is made of the following raw materials in parts by weight: 15 parts of alkali metal salt, 10 parts of alcohol solvent and 30 parts of deionized water;

[0085] The preparation process of the cleaning agent is as follows:

[0086] Accurately weigh the alkali metal salt, alcohol solvent and deionized water, and place the alkali metal salt, alcohol solvent and deionized water in a stirrer to mix them thoroughly;

[0087] The material is discharged, and then successively inspected, measured and packaged to finally obtain the finished cleaning agent.

[0088] Furthermore, the alkali metal salt is sodium sulfate decahydrate.

[0089] The alcohol solvent is 2-methylcyclohexanol.

[0090] In addition, the processing process is as follows:

[0091] Use milling machines to mill the base material of automobile cover molds;

[0092] Then use grinding equipment to finely grind the base material of the automobile cover mold to the designed size.

[0093] In this embodiment, it should be noted that the mold is cleaned with a cleaning agent to ensure that the mold is kept clean after molding, and then processed and assembled to complete the design of the automobile cover mold.

[0094] Embodiment 3:

[0095] like Figure 1 As shown, this embodiment provides a method for designing a mold for an automobile cover, comprising the following steps:

[0096] S1. Divide the automobile cover into several sub-components according to the geometric structure of the automobile cover, and construct a virtual three-dimensional model containing each sub-component.

[0097] The process of constructing a virtual three-dimensional model containing various sub-components is as follows:

[0098] Obtain the basic points of each sub-component and connect adjacent basic points to form a basic three-dimensional model;

[0099] The formed basic three-dimensional model is compared with the geometric structure of the automobile cover, and the corresponding basic point connection lines are adjusted to obtain a virtual three-dimensional model containing various sub-components.

[0100] Furthermore, the basic points include convex points, inflection points and concave points.

[0101] Adjusting the corresponding basic point connection lines refers to adjusting the connection lines of the basic points so that the curved surface formed by the connection lines of the basic points is smooth and consistent with the geometric structure of the automobile cover.

[0102] In this embodiment, it should be noted that when constructing a virtual three-dimensional model containing various sub-components, the movement and contact relationship between the various parts of the model can be determined; the basic three-dimensional model is constructed using basic points, and then the preliminary shape of the automobile cover is obtained. In order to reduce the error between the shape of the automobile cover and the actual situation, the corresponding basic point connecting lines will be adjusted to ensure a smooth surface.

[0103] S2. According to the constructed virtual three-dimensional model containing each sub-component, a finite element CAD digital model is established, and a compensation coefficient is determined. Then, a first compensation of the finite element CAD digital model is performed based on the compensation coefficient, and then a second compensation is performed based on the first compensation.

[0104] The calculation formula of the compensation coefficient is:

[0105] ρ = (1 + ΔT × α1) / (1 + ΔT × α2), where ΔT is the difference between room temperature and curing temperature, α1 is the thermal expansion coefficient of the composite material of the automotive cover, and α2 is the thermal expansion coefficient of the mold material.

[0106] The calculation formula for the first compensation of the finite element CAD digital model based on the compensation coefficient is:

[0107] H1=(ρ+1)×H2, where ρ is the compensation coefficient and H2 is the theoretical size of the mold.

[0108] In this embodiment, it should be noted that if the mold material and the composite material of the automobile cover have different thermal expansion coefficients, it will affect the shape and dimensional accuracy of the automobile cover. The thermal expansion of a smaller mold will hardly affect the composite parts. However, if the mold size is too large and the composite parts have important appearance or assembly features, it is necessary to consider the impact of the different thermal expansion coefficients of the composite material and the mold material. Therefore, size compensation is required during the mold design process.

[0109] In addition, the second compensation refers to increasing the size of the automobile cover mold, such as 0.2mm, to facilitate subsequent milling and grinding to ensure the design size.

[0110] S3. According to the twice-compensated finite element CAD digital model, the design parameters of the automobile cover mold are obtained, the raw materials are melted under high temperature and high pressure, and poured into the mold cavity, and hardened to obtain the molded automobile cover mold base material.

[0111] S4. Pre-treat the base material of the automobile cover mold, and then process and assemble it.

[0112] Among them, the pretreatment means that the base material of the automobile cover mold is first cleaned with a cleaning agent for 3 to 4 times, then rinsed with deionized water for 4 times, and finally dried at 40°C for 70 minutes;

[0113] The cleaning agent is made of the following raw materials in parts by weight: 20 parts of alkali metal salt, 12 parts of alcohol solvent and 35 parts of deionized water;

[0114] The preparation process of the cleaning agent is as follows:

[0115] Accurately weigh the alkali metal salt, alcohol solvent and deionized water, and place the alkali metal salt, alcohol solvent and deionized water in a stirrer to mix them thoroughly;

[0116] The material is discharged, and then successively inspected, measured and packaged to finally obtain the finished cleaning agent.

[0117] Furthermore, the alkali metal salt is potassium aluminum sulfate dodecahydrate.

[0118] The alcohol solvent is triethylene glycol monomethyl ether.

[0119] In addition, the processing process is as follows:

[0120] Use milling machines to mill the base material of automobile cover molds;

[0121] Then use grinding equipment to finely grind the base material of the automobile cover mold to the designed size.

[0122] In this embodiment, it should be noted that the mold is cleaned with a cleaning agent to ensure that the mold is kept clean after molding, and then processed and assembled to complete the design of the automobile cover mold.

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0124] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for designing a mold for an automobile cover, characterized in that: The following steps are involved: S1. Divide the automobile cover into several sub-components according to the geometric structure of the automobile cover, and construct a virtual three-dimensional model containing each sub-component; S2. According to the constructed virtual three-dimensional model containing each sub-component, a finite element CAD digital model is established, and a compensation coefficient is determined, and then a first compensation of the finite element CAD digital model is performed based on the compensation coefficient, and then a second compensation is performed based on the first compensation; S3. According to the twice-compensated finite element CAD digital model, the design parameters of the automobile cover mold are obtained, the raw material is melted under high temperature and high pressure, and poured into the mold cavity, and hardened to obtain the molded automobile cover mold base material; S4. Pre-treat the base material of the automobile cover mold, and then process and assemble it.

2. A method for designing a mold for an automobile cover according to claim 1, characterized in that: In step S1, the process of constructing a virtual three-dimensional model containing various sub-components is as follows: Obtain the basic points of each sub-component and connect adjacent basic points to form a basic three-dimensional model; The formed basic three-dimensional model is compared with the geometric structure of the automobile cover, and the corresponding basic point connection lines are adjusted to obtain a virtual three-dimensional model containing various sub-components.

3. A method for designing a mold for an automobile cover according to claim 2, characterized in that: The basic points include convex points, inflection points and concave points.

4. The method for designing a mold for an automobile cover according to claim 2, characterized in that: The adjusting of the corresponding basic point connection lines refers to adjusting the connection lines of the basic points so as to make the curved surface formed by the connection lines of the basic points smooth and consistent with the geometric structure of the automobile cover.

5. The method for designing a mold for an automobile cover according to claim 1, characterized in that: In step S2, the calculation formula of the compensation coefficient is: ρ = (1 + ΔT × α1) / (1 + ΔT × α2), where ΔT is the difference between room temperature and curing temperature, α1 is the thermal expansion coefficient of the composite material of the automotive cover, and α2 is the thermal expansion coefficient of the mold material.

6. A method for designing a mold for an automobile cover according to claim 5, characterized in that: In step S2, the calculation formula for performing the first compensation of the finite element CAD digital model based on the compensation coefficient is: H1=(ρ+1)×H2, where ρ is the compensation coefficient and H2 is the theoretical size of the mold.

7. The method for designing a mold for an automobile cover according to claim 1, characterized in that: In the step S4, the pretreatment means first cleaning the automobile cover mold base material with a cleaning agent for 3 to 4 times, then rinsing it with deionized water for 2 to 4 times, and finally drying it at 30 to 40° C. for 60 to 70 minutes; The cleaning agent is made of the following raw materials in parts by weight: 10 to 20 parts of alkali metal salt, 8 to 12 parts of alcohol solvent and 25 to 35 parts of deionized water; The preparation process of the cleaning agent is as follows: Accurately weigh the alkali metal salt, alcohol solvent and deionized water, and place the alkali metal salt, alcohol solvent and deionized water in a stirrer to mix them thoroughly; The material is discharged, and then successively inspected, measured and packaged to finally obtain the finished cleaning agent.

8. A method for designing a mold for an automobile cover according to claim 7, characterized in that: The alkali metal salt is selected from any one of sodium chloride, sodium sulfate decahydrate, and potassium aluminum sulfate dodecahydrate.

9. The method for designing a mold for an automobile cover according to claim 7, characterized in that: The alcohol solvent is selected from any one of 2-ethyl-1-butanol, 2-methylcyclohexanol, triethylene glycol, and triethylene glycol monomethyl ether.

10. The method for designing a mold for an automobile cover according to claim 7, characterized in that: In step S4, the processing process is as follows: Use milling machines to mill the base material of automobile cover molds; Then use grinding equipment to finely grind the base material of the automobile cover mold to the designed size.

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