Front machine cover decorating part fixing mode design method and device and storage medium

Abstract

The invention provides a front cover decorating part fixing mode design method and device and a storage medium. The method comprises the following steps: acquiring the bonding force of the adhesive for the decorative part; acquiring the hardness index and quantity of rubber used by the buffer block; obtaining kinematics parameters of the front cover, a hinge and a decorating part under the opening and closing states of the front cover and sections of the front cover, the hinge and the decorating part in a ZX plane under a whole vehicle coordinate system through three-dimensional modeling; establishing an evaluation medium model based on the kinematics parameters of the front machine cover, the hinge and the decorating part and the fracture surface to obtain parameters required by stress calculation of the decorating part; calculating the instantaneous stress of the decorative part at the moment of closing the machine cover under the limit working condition based on the kinematics parameters, the stress calculation required parameters of the decorative part and the hardness index and quantity of rubber used by the buffer block; according to the relation between the ratio of the instantaneous stress of the decorative part at the moment of closing the machine cover to the bonding force of the glue for the decorative part under the limit working condition and a set threshold value, the feasibility of gluing the decorative part is evaluated, and the design is optimized or a fixing mode is selected.

Description

Technical Field

[0001] The present invention relates to the technical field of front hood decorative part fixing design, and in particular to a front hood decorative part fixing design method, device and storage medium. Background Art

[0002] The fixing method of decorative parts usually chooses screw fixing or bonding fixing. Both methods have their own advantages and disadvantages. The bonding process is easy to operate and easy for workers to construct, but the product fixing strength is related to the product quality and the bonding area of ​​3M glue. When choosing this type of fixing method, it is necessary to focus on the above factors and information to balance the convenience and practicality of installation. Screw connection can provide high fixing strength, but screw connection has high requirements on product structure. The product needs to have a corresponding installation structure or embedded nuts for embedded bolts, which causes the product cost to rise. When the decorative parts are screwed and installed, the front hood needs to be opened and assembled from the back of the sheet metal, which affects the product assembly efficiency. Screw fixing is not friendly to the aftermarket, so the priority of screw fixing is lower. In the product development stage, it is necessary to define the fixing method of decorative parts to avoid changing the fixing method after the subsequent physical product comes out, which will cause the product to generate design change costs. Therefore, for the decorative parts on the front hood, a design method for fixing the front hood decorative parts is needed. By simulating the operating conditions of the decorative parts and analyzing the stress characteristics of the decorative parts, the feasibility of the fixing method of the decorative parts can be judged. Summary of the invention

[0003] In order to solve the above technical problem or at least partially solve the above technical problem, the present invention provides a method, device and storage medium for designing a fixing method of a front hood decorative part.

[0004] In a first aspect, the present invention provides a method for designing a fixing method of a front hood decorative part, comprising:

[0005] Obtain the bonding force F1 of the glue used for decoration on the decorative part; obtain the hardness index and quantity of the rubber used for the buffer block;

[0006] Construct an assembly of the front hood, hinges, struts, and decorative parts through 3D modeling and configure the corresponding material medium information; use the assembly to obtain the kinematic parameters of the front hood, hinges, and decorative parts when the front hood is open or closed, and the cross-section of the front hood, hinges, and decorative parts in the ZX plane of the vehicle coordinate system;

[0007] An evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system, and the parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model;

[0008] Based on kinematic parameters, parameters required for force calculation of decorative parts, hardness index and quantity of rubber used in buffer blocks, calculate the instantaneous force F of decorative parts when the front hood is closed under extreme working conditions;

[0009] According to the relationship between the ratio of the instantaneous force F on the decorative parts when the front hood is closed under extreme working conditions and the bonding force F1 of the decorative parts glue and the set threshold, the feasibility of gluing the decorative parts is evaluated, and the gluing design is optimized or the fixing method is selected.

[0010] Furthermore, the assembly of the front hood, hinge, strut, and decorative parts is constructed through 3D modeling and the corresponding material medium information is configured; the kinematic parameters of the front hood, hinge, and decorative parts in the open and closed states of the front hood and the cross-section of the front hood, hinge, and decorative parts in the ZX plane of the vehicle coordinate system are obtained using the assembly, including:

[0011] In the 3D software, open the 3D model of the front hood, hinges, struts and trims;

[0012] In the vehicle coordinate system, the front hood, hinge, strut and decorative parts are assembled to obtain an assembly; the front hood, hinge, strut and decorative parts are given corresponding material medium information;

[0013] Configure the assembly to have the front hood open and closed;

[0014] Obtain the kinematic parameters of the front hood, hinges and decorative parts when the front hood is open or closed, and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system;

[0015] Based on the ZX plane in the vehicle coordinate system, the front hood section, decorative part section and hinge section when the front hood is open and closed are extracted.

[0016] Furthermore, the kinematic parameters include:

[0017] The total mass of the front hood and the decorative parts m1, and the mass of the decorative parts m2; wherein the mass is calculated based on the respective volumes of the front hood and the decorative parts in the three-dimensional model and the density of the configured material medium;

[0018] The front hood and the decorative parts are regarded as a moving whole. When the front hood is open, the coordinates of the center of mass G1 of the moving whole are obtained. When the front hood is closed, the coordinates of the center of mass G2 of the moving whole are obtained. When the front hood is closed, the center of mass G3 of the decorative parts is obtained.

[0019] Get the axis G of rotation of the hinge.

[0020] Furthermore, an evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system. The parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model, including:

[0021] Assemble the front hood sections, decorative parts sections and hinge sections in the open and closed states of the front hood, and project the coordinates of the center of mass G1, center of mass G2, center of mass G3 and axis G onto the corresponding sections to obtain the evaluation medium model;

[0022] When the front hood of the evaluation medium model is closed, the Z-direction cutting angle θ between the decorative part installation surface and the sheet metal is obtained. θ is used to evaluate the shear force generated by the movement of the decorative part at the moment the front hood is closed. The height difference h between the center of mass G1 and the center of mass G2 is measured. h is used to evaluate the working stroke when the front hood is closed. The distance L1 between the overall center of mass G2 of the front hood and decorative part movement and the hinge axis G, and the distance L2 between the center of mass G3 of the decorative part and the hinge axis G are measured.

[0023] Furthermore, based on kinematic parameters, parameters required for force calculation of decorative parts, hardness index and quantity of rubber used in buffer blocks, the instantaneous force F of decorative parts when the front hood is closed under extreme working conditions is calculated, including:

[0024] At the moment of closing the front hood under extreme working conditions, the instantaneous force F of the decorative part is calculated based on the velocity of the decorative part mass center G3 V2, the mass of the decorative part m2, the number of rubber buffer blocks n, the compression amount d, and the Z-direction cutting angle θ between the decorative part installation surface and the sheet metal:

[0025]

[0026] Furthermore, under the extreme working condition, the velocity of the center of mass G3 of the decorative part when the front hood is closed is calculated as V2:

[0027]

[0028] Among them, L1 is the distance between the overall mass center G2 of the front hood and decorative parts and the hinge axis G, L2 is the distance L2 between the mass center G3 of the decorative parts and the hinge axis G, and V1 is the velocity at the mass center of the front hood and decorative parts when the front hood is closed under extreme working conditions:

[0029] Here, g is the acceleration due to gravity.

[0030] Furthermore, the compression amount d of the buffer block is calculated based on the elastic modulus E, the total mass of the front hood and the decorative parts m1, and the velocity V1 at the center of mass of the front hood and the decorative parts when the front hood is closed under extreme working conditions:

[0031]

[0032] Among them, according to the hardness index H of the rubber used in the buffer block r Calculate the elastic modulus E of the buffer block:

[0033] IgE=0.0198H r -0.5432.

[0034] Furthermore, the feasibility of gluing the decorative parts is evaluated based on the relationship between the ratio of the instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F1 of the glue used for the decorative parts and the set threshold. The gluing design is optimized or the fixing method is selected, including:

[0035] Under extreme working conditions, the ratio of the instantaneous force F of the decorative part when the front hood is closed to the bonding force F1 of the adhesive used for the decorative part is less than or equal to a set first threshold value, and the decorative part is preferably fixed by adhesive bonding;

[0036] If the ratio of the instantaneous force F of the decorative part when the front hood is closed under extreme working conditions to the bonding force F1 of the adhesive used for the decorative part is less than or equal to the set second threshold value and greater than the first threshold value, and 1≥F / F1>0.8, the bonding area of ​​the decorative part is optimized by increasing the bonding force by increasing the bonding area, or the decorative part is lightweighted, and the ratio of the instantaneous force F of the decorative part when the front hood is closed under extreme working conditions to the bonding force F1 of the adhesive used for the decorative part is less than or equal to the set first threshold value;

[0037] Under extreme working conditions, the ratio of the instantaneous force F on the decorative part when the front hood is closed to the bonding force F1 of the glue used for the decorative part is greater than the set second threshold value, and the decorative part is fixed by screwing.

[0038] In a second aspect, the present invention provides a device for designing a fixing method of a front hood decorative part, comprising: at least one processing unit, the processing unit being connected to a storage unit via a bus unit, the storage unit storing a computer program, and when the computer program is executed by the processing unit, the method for designing a fixing method of a front hood decorative part is implemented.

[0039] In a third aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for designing a fixing method for a front hood decorative part is implemented.

[0040] The above technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0041] The present invention obtains the adhesion of the glue used for the decorative parts; obtains the hardness index and quantity of the rubber used for the buffer block; obtains the kinematic parameters of the front hood, hinge and decorative parts in the open and closed states of the front hood and the cross-sections of the front hood, hinge and decorative parts in the ZX plane of the whole vehicle coordinate system through three-dimensional modeling; creates an evaluation medium model based on the kinematic parameters of the front hood, hinge and decorative parts and the cross-sections of the front hood, hinge and decorative parts in the ZX plane of the whole vehicle coordinate system to obtain the parameters required for the force calculation of the decorative parts; calculates the instantaneous force of the decorative parts at the moment of closing the front hood under extreme working conditions based on the kinematic parameters, the parameters required for the force calculation of the decorative parts, and the hardness index and quantity of the rubber used for the buffer block; evaluates the feasibility of the glue-fixed decorative parts according to the relationship between the instantaneous force of the decorative parts at the moment of closing the front hood under extreme working conditions and the adhesion force of the glue used for the decorative parts and a set threshold, and optimizes the design or selects a fixing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0043] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 A flow chart of a method for designing a fixing method of a front hood decoration provided in an embodiment of the present application;

[0045] Figure 2 The present invention provides an embodiment of the present invention, which provides a flow chart for constructing an assembly of a front hood, hinge, strut, and decorative parts through three-dimensional modeling and configuring corresponding material medium information; using the assembly to obtain the kinematic parameters of the front hood, hinge, and decorative parts in the open and closed states of the front hood and the cross-section of the front hood, hinge, and decorative parts in the ZX plane of the vehicle coordinate system;

[0046] Figure 3 A schematic diagram of an evaluation medium model provided in an embodiment of the present application;

[0047] Figure 4 A flowchart for evaluating the feasibility of gluing decorative parts, optimizing the gluing design or selecting a fixing method according to the relationship between the ratio of the instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F1 of the glue used for the decorative parts and a set threshold value provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of a device for designing a fixing method for a front hood decoration provided in an embodiment of the present application.

[0049] The symbols and their meanings in the figure are as follows:

[0050] 1. Front hood, 2. Center of mass G1, 3. Hinge, 4. Axis G, 5. Center of mass G2, 6. Decorative parts, 7. Center of mass G3. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0052] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0053] Example 1

[0054] like Figure 1 As shown, the present invention provides a method for designing a fixing method of a front hood decorative part, comprising:

[0055] The first step is to obtain the bonding force F1 when the glue used for decoration acts on the decorative part; and to obtain the hardness index and quantity of the rubber used for the buffer block.

[0056] The bonding force of the glue used for decoration on the decorative parts. Use the actual decorative parts for 3D proofing, glue bonding, measure the peeling force of the decorative parts as the bonding force or estimate the bonding force based on the bonding area of ​​the decorative parts and the peeling force per unit area of ​​the glue. Obtain the hardness and quantity n of the rubber used in the buffer block for calculation in subsequent steps.

[0057] The second step is to construct the assembly of the front hood, hinges, struts, and decorative parts through 3D modeling and configure the corresponding material medium information; the assembly is used to obtain the kinematic parameters of the front hood, hinges, and decorative parts in the open and closed states of the front hood, and the cross-section of the front hood, hinges, and decorative parts in the ZX plane of the vehicle coordinate system. Figure 2 As shown, including:

[0058] Use 3D software, such as CATIA, to open the 3D model of the front hood, hinges, struts and decorative parts; simultaneously assign the corresponding material medium information to the front hood, hinges, struts and decorative parts.

[0059] In the vehicle coordinate system, the front hood, hinges, struts, and decorative parts are assembled to obtain an assembly.

[0060] The assembly is used to obtain the kinematic parameters of the front hood, hinges and decorative parts when the front hood is opened or closed, and the cross-sections of the front hood, hinges and decorative parts in the ZX plane.

[0061] Among them, the kinematic parameters include: the total mass m1 of the front hood and decorative parts, and the mass m2 of the decorative parts, wherein the mass is calculated based on the respective volumes of the front hood and decorative parts in the three-dimensional model and the density of the configured material medium; the front hood and decorative parts are regarded as a moving whole, and when the front hood is open, the coordinates of the center of mass G1 of the moving whole are obtained, and when the front hood is closed, the coordinates of the center of mass G2 of the moving whole are obtained; when the front hood is closed, the center of mass G3 of the decorative parts are obtained; and the axis of rotation G of the hinge is obtained.

[0062] Based on the ZX plane in the vehicle coordinate system, the front hood section, decorative part section, and hinge section when the front hood is open and closed are extracted, and each section has corresponding material medium characteristics.

[0063] The third step is to create an evaluation medium model based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system, and obtain the parameters required for the force calculation of the decorative parts through the evaluation medium model.

[0064] In the specific implementation process, Figure 3 As shown, based on the ZX plane in the vehicle coordinate system, the front hood section, decorative part section and hinge section in the open and closed states are assembled, and the center of mass G1, center of mass G2, center of mass G3 and axis G coordinates are projected into the corresponding sections to obtain the evaluation medium model.

[0065] The parameters obtained using the evaluation medium model include: when the front hood of the evaluation medium model is closed, obtaining the Z-axis cutting angle θ between the decorative part installation surface and the sheet metal, θ is used to evaluate the shear force generated by the movement of the decorative part at the moment the front hood is closed; measuring the height difference h between the center of mass G1 and the center of mass G2, h is used to evaluate the working stroke when the front hood is closed; measuring the distance L1 between the overall center of mass G2 of the front hood and decorative part movement and the hinge axis G, and the distance L2 between the center of mass G3 of the decorative part and the hinge axis G.

[0066] The fourth step is to calculate the instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions based on the kinematic parameters, the parameters required for the force calculation of the decorative parts, the hardness index and quantity of the rubber used in the buffer block.

[0067] At the moment of closing the front hood under extreme working conditions, the instantaneous force F of the decorative part is calculated based on the velocity of the decorative part mass center G3 V2, the mass of the decorative part m2, the number of rubber buffer blocks n, the compression amount d, and the Z-direction cutting angle θ between the decorative part installation surface and the sheet metal:

[0068]

[0069] Among them, the velocity of the center of mass G3 of the decorative part when the front hood is closed under extreme working conditions is V2:

[0070]

[0071] Among them, V1 is the velocity at the center of mass of the front hood and the decorative parts when the front hood is closed under extreme working conditions: Where g is the acceleration due to gravity. Since the limiting condition is taken, the air resistance that hinders the closing of the front hood is ignored here.

[0072] The compression amount d of the buffer block is calculated based on the elastic modulus E, the total mass of the front hood and decorative parts m1, and the velocity V1 at the center of mass of the front hood and decorative parts when the front hood is closed under extreme working conditions:

[0073]

[0074] Among them, according to the hardness index H of the rubber used in the buffer block r Calculate the elastic modulus E of the buffer block: lgE = 0.0198H r -0.5432.

[0075] Step 5: According to the relationship between the ratio of the instantaneous force F of the decorative part when the front hood is closed under extreme working conditions and the bonding force F1 of the decorative part glue and the set threshold, the feasibility of gluing the decorative part is evaluated, and the gluing design is optimized or the fixing method is selected. Figure 4 As shown, including:

[0076] Under extreme working conditions, the ratio of the instantaneous force F of the decorative part when the front hood is closed to the bonding force F1 of the adhesive used for the decorative part is less than or equal to a set first threshold value, and the decorative part is preferably fixed by adhesive bonding;

[0077] If the ratio of the instantaneous force F of the decorative part when the front hood is closed under extreme working conditions to the bonding force F1 of the adhesive used for the decorative part is less than or equal to the set second threshold value and greater than the first threshold value, the bonding area of ​​the decorative part is optimized by increasing the bonding force by increasing the bonding area, or the decorative part is lightweighted, and the ratio of the instantaneous force F of the decorative part when the front hood is closed under extreme working conditions to the bonding force F1 of the adhesive used for the decorative part is less than or equal to the set first threshold value;

[0078] Under extreme working conditions, the ratio of the instantaneous force F on the decorative part when the front hood is closed to the bonding force F1 of the glue used for the decorative part is greater than the set second threshold value, and the decorative part is fixed by screwing.

[0079] An exemplary first threshold is 0.8, and an exemplary second threshold is 1.

[0080] Here is a specific example:

[0081] Select 3M glue for bonding. The bonding force of 3M glue acting on the decorative part is estimated to be F1=450N through the bonding area of ​​the decorative part and the unit area peeling force of 3M glue. The number of rubber buffer blocks n is 3, and the Shore hardness of the rubber used for the buffer blocks is 75.

[0082] Use CATIA to open the 3D model of the front hood, hinges, struts and trims in the 3D software;

[0083] In the vehicle coordinate system, assemble the front hood, hinge, strut, and decorative parts to obtain an assembly; assign corresponding material medium information to the front hood, hinge, strut, and decorative parts; the decorative parts material is PP-EPDM-T20 with a density of 1.04, and the sheet metal material is DC56 steel plate with a density of 7.8. Configure the assembly to have the front hood open and closed; obtain the kinematic parameters of the front hood, hinge, and decorative parts in the open and closed states, and the cross-section of the front hood, hinge, and decorative parts in the ZX plane in the vehicle coordinate system.

[0084] Obtain the total mass m1 of the front hood and decorative parts, and the mass m2 of the decorative parts; wherein, the mass is calculated based on the respective volumes of the front hood and decorative parts in the three-dimensional model and the density of the configured material medium; regard the front hood and decorative parts as a moving whole, and when the front hood is open, obtain the coordinates of the center of mass G1 of the moving whole, and when the front hood is closed, obtain the coordinates of the center of mass G2 of the moving whole; when the front hood is closed, obtain the center of mass G3 of the decorative parts; obtain the axis of rotation G of the hinge.

[0085] In this example, the total mass m1 of the front hood and the decorative parts is 8.9 kg, and the mass m2 of the decorative parts is 0.26 kg.

[0086] An evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system. The parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model.

[0087] When the front hood of the evaluation medium model is closed, the Z-direction cutting angle θ=30° between the decorative part installation surface and the sheet metal is obtained; the height difference h=0.4m between the center of mass G1 and the center of mass G2 is measured; the distance L1=0.52m between the overall center of mass G2 of the front hood and the decorative part and the hinge axis G, and the distance L2=1.01m between the center of mass G3 of the decorative part and the hinge axis G are measured.

[0088] Calculate the velocity of the front hood and the decorative parts at the center of mass G2 when the front hood is closed under extreme working conditions:

[0089] We get V1 = 2.8 m / s;

[0090] Under extreme working conditions, the velocity of the center of mass G3 of the decorative part when the front hood is closed is calculated to be V2:

[0091] We get V2 = 5.4 m / s;

[0092] Among them, according to the hardness index H of the rubber used in the buffer block r Calculate the elastic modulus E of the buffer block: lgE = 0.0198H r -0.5432, E = 8.7 MPa;

[0093] The compression amount d of the buffer block is calculated based on the elastic modulus E, the total mass of the front hood and decorative parts m1, and the velocity V1 at the center of mass of the front hood and decorative parts when the front hood is closed under extreme working conditions:

[0094] We get d = 4 mm

[0095] At the moment of closing the front hood under extreme working conditions, according to the velocity of the center of mass G3 of the decorative part V2, the mass of the decorative part m2, the number of rubber buffer blocks n, the compression amount d, and the Z-direction cutting angle θ between the decorative part installation surface and the sheet metal, the instantaneous force F of the decorative part is calculated.

[0096] We get F=273N.

[0097] Evaluate the feasibility of bonding methods.

[0098] According to calculations, when the front hood is closed under extreme working conditions, the decorative parts are subjected to an instantaneous force of F=273N, F / F1≤0.8, and the decorative parts can be bonded with 3M glue.

[0099] Example 2

[0100] like Figure 5 The embodiment of the present invention provides a front hood decorative part fixing method design device, comprising: at least one processing unit, the processing unit is connected to a storage unit via a bus unit, the storage unit stores a computer program, the processing unit executes the computer program to implement the front hood decorative part fixing method design method, including:

[0101] Obtain the adhesive force F1 of the glue used for the decorative part; obtain the hardness index and quantity of the rubber used for the buffer block;

[0102] Construct an assembly of the front hood, hinges, struts, and decorative parts through 3D modeling and configure the corresponding material medium information; use the assembly to obtain the kinematic parameters of the front hood, hinges, and decorative parts when the front hood is open or closed, and the cross-section of the front hood, hinges, and decorative parts in the ZX plane of the vehicle coordinate system;

[0103] An evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system, and the parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model;

[0104] Based on kinematic parameters, parameters required for force calculation of decorative parts, hardness index and quantity of rubber used in buffer blocks, calculate the instantaneous force F of decorative parts when the front hood is closed under extreme working conditions;

[0105] According to the relationship between the ratio of the instantaneous force F on the decorative parts when the front hood is closed under extreme working conditions and the bonding force F1 of the decorative parts glue and the set threshold, the feasibility of gluing the decorative parts is evaluated, and the gluing design is optimized or the fixing method is selected.

[0106] Of course, the computer program stored in the storage unit of a front hood decorative part fixing method design device provided in an embodiment of the present invention is not limited to the method operations described above, and can also execute related operations in a front hood decorative part fixing method design method provided in any embodiment of the present invention.

[0107] Example 3

[0108] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a host computer and a hardware-in-the-loop simulation test platform, the method for designing a fixing method of a front hood decoration part is implemented, including:

[0109] Obtain the adhesive force F1 of the glue used for the decorative part; obtain the hardness index and quantity of the rubber used for the buffer block;

[0110] Construct an assembly of the front hood, hinges, struts, and decorative parts through 3D modeling and configure the corresponding material medium information; use the assembly to obtain the kinematic parameters of the front hood, hinges, and decorative parts when the front hood is open or closed, and the cross-section of the front hood, hinges, and decorative parts in the ZX plane of the vehicle coordinate system;

[0111] An evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system, and the parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model;

[0112] Based on kinematic parameters, parameters required for force calculation of decorative parts, hardness index and quantity of rubber used in buffer blocks, calculate the instantaneous force F of decorative parts when the front hood is closed under extreme working conditions;

[0113] According to the relationship between the ratio of the instantaneous force F on the decorative parts when the front hood is closed under extreme working conditions and the bonding force F1 of the decorative parts glue and the set threshold, the feasibility of gluing the decorative parts is evaluated, and the gluing design is optimized or the fixing method is selected.

[0114] A computer-readable storage medium provided in an embodiment of the present invention stores a computer program which is not limited to the method operations described above, but can also execute related operations in a method for designing a fixing method for a front hood decoration provided in any embodiment of the present invention.

[0115] In the embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses and storage media can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the description division of the circuit is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling shown or discussed can be indirect coupling through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0116] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A design method for fixing a front hood decorative part. It is characterized in that include: Obtain the bonding force F of the glue used for decoration on the decorative parts 1 ; Obtain the hardness index and quantity of the rubber used in the buffer block; Construct an assembly of the front hood, hinges, struts, and decorative parts through 3D modeling and configure the corresponding material medium information; use the assembly to obtain the kinematic parameters of the front hood, hinges, and decorative parts when the front hood is open or closed, and the cross-section of the front hood, hinges, and decorative parts in the ZX plane of the vehicle coordinate system; An evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system, and the parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model; Based on kinematic parameters, parameters required for force calculation of decorative parts, hardness index and quantity of rubber used in buffer blocks, calculate the instantaneous force F of decorative parts when the front hood is closed under extreme working conditions; According to the instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F of the decorative parts glue 1 The relationship between the ratio and the set threshold is used to evaluate the feasibility of gluing decorative parts, optimize the gluing design or select the fixing method.

2. According to the design method for fixing the front hood decoration part according to claim 1, It is characterized in that Construct the assembly of the front hood, hinges, struts, and decorative parts through 3D modeling and configure the corresponding material medium information; obtain the kinematic parameters of the front hood, hinges, and decorative parts when the front hood is open or closed, and the cross-section of the front hood, hinges, and decorative parts in the ZX plane of the vehicle coordinate system, including: In the 3D software, open the 3D model of the front hood, hinges, struts and trims; In the vehicle coordinate system, the front hood, hinge, strut and decorative parts are assembled to obtain an assembly; the front hood, hinge, strut and decorative parts are given corresponding material medium information; Configure the assembly to have the front hood open and closed; Obtain the kinematic parameters of the front hood, hinges and decorative parts when the front hood is open or closed, and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system; Based on the ZX plane in the vehicle coordinate system, the front hood section, decorative part section and hinge section when the front hood is open and closed are extracted.

3. According to the design method for fixing the front hood decoration part according to claim 2, It is characterized in that The kinematic parameters include: Total mass of front hood and trim parts m 1 , Decorative parts mass m 2 ; Wherein, the mass is calculated based on the volume of the front hood and the decorative parts and the density of the configured material medium in the three-dimensional model; Consider the front hood and the decorative parts as a moving whole. When the front hood is open, obtain the center of mass G of the moving whole. 1 Coordinates, when the front cover is closed, obtain the center of mass G of the entire movement 2 Coordinates; When the front hood is closed, obtain the center of mass G of the decorative part 3 ; Get the axis G of rotation of the hinge.

4. According to the method for designing the fixing method of the front hood decoration part according to claim 1, It is characterized in that An evaluation medium model is created based on the kinematic parameters of the front hood, hinges and decorative parts and the cross-sections of the front hood, hinges and decorative parts in the ZX plane of the vehicle coordinate system. The parameters required for the force calculation of the decorative parts are obtained through the evaluation medium model, including: Based on the ZX plane of the vehicle coordinate system, assemble the front hood section, decorative section and hinge section when the front hood is open and closed, and take the center of mass G 1 , center of mass G 2 , center of mass G 3 and the axis G coordinates are projected into the corresponding section to obtain the evaluation medium model; The parameters obtained by using the evaluation medium model include: when the front hood of the evaluation medium model is closed, the Z-direction tangent angle θ between the decorative part installation surface and the sheet metal is obtained, and θ is used to evaluate the shear force generated by the movement of the decorative part when the front hood is closed; the center of mass G is measured. 1 , center of mass G 2 The height difference h is used to evaluate the working stroke when the front hood is closed; the overall center of mass G of the front hood and decorative parts is measured. 2 Distance L from hinge axis G 1 , the centroid of the decorative part G 3 Distance L from hinge axis G 2 .

5. According to the method for designing the fixing method of the front hood decoration part according to claim 1, It is characterized in that Based on kinematic parameters, parameters required for force calculation of decorative parts, hardness index and quantity of rubber used in buffer blocks, the instantaneous force F of decorative parts when the front hood is closed under extreme working conditions is calculated, including: At the moment of closing the front hood under extreme working conditions, according to the center of mass of the decorative part G 3 The speed is V 2 , the mass of the decorative part m 2 , the number of rubber buffer blocks n, the compression amount d, the Z-direction cutting angle θ between the decorative part installation surface and the sheet metal, calculate the instantaneous force F of the decorative part:

6. According to the method for designing the fixing method of the front hood decoration part according to claim 5, It is characterized in that Calculate the center of mass G of the decorative part when the front hood is closed under extreme working conditions 3 The speed is V 2 : Among them, L 1 G is the overall mass center of the front hood and trim movement 2 Distance from hinge axis G, L 2 G is the center of mass of the decorative part 3 Distance L from hinge axis G 2 , V 1 The center of mass G of the front hood and decorative parts when the front hood is closed is calculated under extreme working conditions. 2 Speed: Here, g is the acceleration due to gravity.

7. According to the method for designing the fixing method of the front hood decoration part according to claim 5, It is characterized in that According to the elastic modulus E, the total mass of the front hood and decorative parts is m 1 , the velocity V at the center of mass of the front hood and the decorative parts when the front hood is closed under extreme conditions 1 Calculate the compression amount d of the buffer block: Among them, according to the hardness index H of the rubber used in the buffer block r Calculate the elastic modulus E of the buffer block: lgE=0.0198H r -0.5432。 8. According to the method for designing the fixing method of the front hood decoration part as claimed in claim 1, It is characterized in that According to the instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F of the decorative parts glue 1 The relationship between the ratio and the set threshold value is used to evaluate the feasibility of adhesive fixing decorative parts, and to optimize the adhesive fixing design or select the fixing method including: The instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F of the decorative parts glue 1 The ratio is less than or equal to a set first threshold value, and the decorative element is preferably fixed by adhesive bonding; The instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F of the decorative parts glue 1 If the ratio is less than or equal to the set second threshold and greater than the first threshold, and 1≥F / F1>0.8, the bonding area of ​​the decorative part is optimized, the bonding force is increased by increasing the bonding area, or the decorative part is lightweighted, and the instantaneous force F of the decorative part when the front hood is closed under extreme working conditions and the bonding force F of the decorative part glue are measured and tested to see whether the lightweight design meets the requirements. 1 The ratio is less than or equal to a set first threshold; The instantaneous force F of the decorative parts when the front hood is closed under extreme working conditions and the bonding force F of the decorative parts glue 1 If the ratio is greater than a set second threshold, the decorative element is fixed by screwing.

9. A design device for fixing the front hood decorative part. It is characterized in that include: At least one processing unit, the processing unit is connected to a storage unit via a bus unit, the storage unit stores a computer program, and when the computer program is executed by the processing unit, a method for designing a fixing method of a front hood decoration part as described in any one of claims 1-8 is implemented.

10. A computer-readable storage medium storing a computer program, It is characterized in that When the computer program is executed by a processor, the method for designing a fixing method of a front hood decoration part as described in any one of claims 1 to 8 is implemented.

Images