A design method for injection-molded plastic parts for vehicles, injection-molded plastic parts, and vehicles.

Abstract

This application discloses a design method for injection-molded plastic parts of a vehicle, the injection-molded plastic parts, and a vehicle. The method includes: drawing a three-dimensional model of the injection-molded plastic part; constructing an analysis model based on the three-dimensional model to simulate the injection deformation of the injection-molded plastic part; configuring the process parameters of the analysis model and performing simulation analysis to determine the simulated deformation amount of the analysis model; determining the calibration deformation amount of the three-dimensional model based on the simulated deformation amount and the position of the mounting structure of the three-dimensional model used for fixed connection with the vehicle body; modifying the three-dimensional model if the calibration deformation amount is greater than a preset threshold, and repeating the above steps until the calibration deformation amount is less than or equal to the preset threshold.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of vehicle component technology, and particularly to a design method for injection-molded plastic parts for vehicles, the injection-molded plastic parts, and the vehicle. Background Technology

[0002] Injection molding involves injecting molten plastic into the cavity of a closed mold under high pressure and high speed. After processes such as holding pressure and cooling, a plastic part that conforms to the mold cavity is obtained. However, during the injection molding process, the plastic material has characteristics such as variability, nonlinearity, and non-steady state, and the resulting plastic parts often have some defects, such as short shots, flash, shrinkage marks, weld lines, air pockets, or warpage.

[0003] For injection-molded plastic parts used in vehicles, they generally need to be matched with other parts of the vehicle. Among the defects mentioned above, warping has a significant impact on the matching between injection-molded plastic parts and other parts of the vehicle, which may lead to unqualified assembly of vehicle parts. Summary of the Invention

[0004] In view of this, embodiments of this application provide a design method for injection-molded plastic parts of a vehicle, the injection-molded plastic parts, and the vehicle.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a design method for injection-molded plastic parts for vehicles, the method comprising:

[0007] Draw a 3D model of the injection-molded plastic part;

[0008] Based on the three-dimensional model, an analytical model is constructed to simulate the injection deformation of the injection-molded plastic part;

[0009] Configure the process parameters of the analysis model and perform simulation analysis to determine the simulated deformation of the analysis model;

[0010] Based on the simulated deformation and the position of the mounting structure used by the three-dimensional model for fixed connection with the vehicle body, the calibration deformation of the three-dimensional model is determined.

[0011] If the calibration deformation is greater than a preset threshold, the three-dimensional model is modified, and the above steps are repeated until the calibration deformation is less than or equal to the preset threshold.

[0012] Secondly, embodiments of this application provide an injection-molded plastic part for a vehicle, which is designed using the injection-molded plastic part design method provided in any of the first aspects.

[0013] In one possible implementation of this application, the injection-molded plastic part is provided with an installation structure, the installation structure including a snap-fit ​​hole and a snap-fit ​​post. The snap-fit ​​hole is formed on the injection-molded plastic part, and the snap-fit ​​post is provided with a first snap-fit ​​part and a second snap-fit ​​part. The first snap-fit ​​part snaps into the snap-fit ​​hole, and the second snap-fit ​​part is used to snap onto the vehicle body. During the process of the second snap-fit ​​part snapping onto the vehicle body, it can drive the snap-fit ​​hole to deform toward the vehicle body.

[0014] In one possible implementation of this application, the injection-molded plastic part includes a first extended surface and a second extended surface, the first extended surface and the second extended surface are not on the same plane, the first extended surface is used to abut against the vehicle body, and the thickness of the connection position between the first extended surface and the second extended surface is less than the thickness of either the first extended surface or the second extended surface.

[0015] Thirdly, embodiments of this application provide a vehicle that includes an injection-molded part of the vehicle provided in any of the second aspects.

[0016] In the design method for injection-molded plastic parts of vehicles provided in this application embodiment, a three-dimensional model of the injection-molded plastic part is drawn, and an analysis model for simulating the injection deformation of the injection-molded plastic part is constructed. By analyzing the analysis model, the simulated deformation amount of the analysis model can be obtained. This simulated deformation amount can characterize the deformation amount of the injection-molded plastic part before it is installed on the vehicle body. Simultaneously, considering the actual situation of the constraint of the mounting structure on the injection-molded plastic part after it is installed on the vehicle body, a calibration deformation amount of the three-dimensional model is obtained based on the aforementioned simulated deformation amount and the relative position of the mounting structure on the injection-molded plastic part. The calibration deformation amount is then compared with a preset threshold. If the calibration deformation amount is greater than the preset threshold, the three-dimensional model is modified based on the calibration deformation amount. In this way, the design method of vehicle injection-molded plastic parts provided in this application embodiment can be matched with the actual situation of injection-molded plastic parts installed on vehicles. This allows the calibration deformation amount to more accurately represent the actual deformation amount of the injection-molded plastic parts after they are installed on the vehicle body. Furthermore, by modifying the three-dimensional model based on the reference deformation amount and repeating the above steps, the calibration deformation amount can be made less than or equal to a preset threshold, so that the deformation amount of the injection-molded plastic parts meets the requirements. Attached Figure Description

[0017] Figure 1 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, provided in an embodiment of this application;

[0018] Figure 2 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, provided in an embodiment of this application;

[0019] Figure 3 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, provided in an embodiment of this application;

[0020] Figure 4 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, provided in an embodiment of this application;

[0021] Figure 5 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, provided in an embodiment of this application;

[0022] Figure 6 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, provided in an embodiment of this application;

[0023] Figure 7 An example of a vehicle injection-molded plastic part (door interior panel) provided in an embodiment of this application;

[0024] Figure 8 A schematic diagram illustrating the setting of snap-fit ​​holes for vehicle injection-molded plastic parts provided in this application embodiment;

[0025] Figure 9 A schematic diagram (top view) of the snap-fit ​​post arrangement for vehicle injection-molded plastic parts provided in this application embodiment;

[0026] Figure 10 A schematic diagram (cross-sectional view) of the snap-fit ​​post arrangement for vehicle injection-molded plastic parts provided in this application embodiment;

[0027] Figure 11 A schematic diagram illustrating the construction of an analytical model for vehicle injection-molded plastic parts provided in this application embodiment;

[0028] Figure 12 A schematic diagram of the first injection speed for the analysis model of the vehicle injection-molded plastic part provided in the embodiments of this application;

[0029] Figure 13 A schematic diagram of the analysis results of the analysis model for vehicle injection-molded plastic parts provided in the embodiments of this application;

[0030] Figure 14 A partial schematic diagram of the analysis results of the analysis model of the vehicle injection-molded plastic part provided in the embodiments of this application;

[0031] Figure 15 This is a partial schematic diagram of the analysis results of the analysis model of the vehicle injection-molded plastic parts provided in the embodiments of this application.

[0032] Figure label:

[0033] 1-Door interior trim panel; 11-First extended surface; 12-Second extended surface; 13-Mounting structure; 131-Snap-fit ​​hole; 132-Snap-fit ​​post; 1321-First snap-fit ​​part; 1322-Second snap-fit ​​part; 2-Body body; a-Flow channel system; b-Cooling circuit system; c-Three-dimensional model of the door interior trim panel. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application are further described in detail below with reference to the accompanying drawings and embodiments. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0036] If the application documents contain similar descriptions such as "first / second", the following explanation shall be added: In the following description, the terms "first / second / third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0038] Considering economic efficiency, environmental friendliness, and lightweight design, and with the continuous improvement in the performance of plastic materials due to advancements in plastic technology, "replacing steel with plastic" is a key concept in vehicle industrial design and development. Plastic parts used in vehicles can be categorized into interior parts, exterior parts, and functional parts. For example, common dashboards and door panels are interior parts, bumpers and light covers are exterior parts, and air conditioning units and coolant reservoirs are functional parts.

[0039] The aforementioned plastic parts generally have complex shapes and are typically manufactured using injection molding. However, due to the unique properties of plastic, defects such as short shots, flash, shrinkage marks, weld lines, air pockets, or warpage often occur during injection molding. Warpage, in particular, has a significant impact on the assembly quality of plastic parts in vehicles, potentially leading to substandard assembly of vehicle components.

[0040] With the development of computer technology, computer-aided techniques can be used to simulate warpage deformation during the injection molding process of plastic parts, and the simulation results can guide the design process of plastic parts. However, in related technologies, the mold for the plastic part is often directly modified based on the simulated amount of warpage deformation. Practical results show that this does not achieve the purpose of pre-deformation.

[0041] Therefore, embodiments of this application provide a design method for injection-molded plastic parts for vehicles.

[0042] It should be noted that the automotive engine compartment storage box detection method provided in this application embodiment can be executed by an electronic device. This electronic device can be various types of terminals such as laptops, tablets, desktop computers, set-top boxes, and mobile devices (e.g., mobile phones, portable music players, personal digital processors, dedicated messaging devices, portable gaming devices), or it can be implemented as a server. The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDNs), and big data and artificial intelligence platforms.

[0043] Figure 1 A flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, as provided in this application embodiment, is shown below. Figure 1 As shown, the method includes steps S11 to S15, wherein:

[0044] Step S11: Draw a three-dimensional model of the injection-molded plastic part.

[0045] With the development of computer technology, computer technology has been applied to the entire process of plastic parts design and manufacturing, such as computer-aided design (CAD), computer-aided engineering (CAE), and computer-aided manufacturing (CAM).

[0046] Based on this, some software has been developed using the aforementioned technologies to assist in the entire process of designing and manufacturing plastic parts.

[0047] To address this, 3D modeling software can be used to create a 3D model of the injection-molded plastic part. For example, 3D modeling software such as Pro / E, UG, or Solidworks can be used to create the 3D model of the injection-molded plastic part.

[0048] Additionally, it should be noted that the 3D model of the injection-molded plastic part can be determined based on the vehicle's shape during the body-in-white design phase.

[0049] Furthermore, in this application embodiment, the specific form of the injection-molded plastic part is not limited, and various injection-molded plastic parts of a vehicle can be designed according to the design method of injection-molded plastic parts of a vehicle provided in this application embodiment. For ease of description of the design method in this application embodiment, the interior trim panel of a vehicle door is used as an example in the specification and accompanying drawings.

[0050] Step S12: Based on the three-dimensional model, construct an analysis model for simulating the injection deformation of the injection-molded plastic part.

[0051] It should be noted that before using CAE technology to analyze the deformation of the 3D model of the injection molded plastic part during the injection molding process, it is necessary to mesh the 3D model of the injection molded plastic part. Furthermore, in order to ensure the accuracy of the analysis results, the high quality of the mesh must also be guaranteed.

[0052] To address this, the first step is to import the 3D model of the injection-molded plastic part into the analysis software. Then, the mesh is generated and repaired within the analysis software to ensure that the mesh meets the requirements for mold flow analysis of the 3D model of the injection-molded plastic part.

[0053] Additionally, it should be noted that mold flow analysis software can be used to construct analytical models for simulating the injection deformation of injection-molded plastic parts. In this application embodiment, the type of mold flow analysis software is not limited; various mold flow analysis software can be appropriately selected, such as Moldflow, Moldex3D, SolidWorks Plastics, or Creo. Among them, Moldflow was the first simulation software used for plastic molding analysis and has become one of the most commonly used software in injection molding CAE technology. To facilitate the description of the design method for injection-molded plastic parts of vehicles provided in this application embodiment, Moldflow will be used as an example in the specification and accompanying drawings.

[0054] To address this, the 3D model of the injection-molded plastic part can be imported into Moldflow. Then, the 3D model of the injection-molded plastic part can be meshed and repaired to ensure that the mesh meets the requirements for mold flow analysis using Moldflow.

[0055] In addition, the analysis model of the injection deformation of the injection-molded plastic parts also includes the construction of a flow channel system for injection molding the plastic parts and a cooling water system for cooling the injection-molded plastic parts.

[0056] For example, refer to Figure 11 According to different locations within the runner system, it can be divided into main runners, branch runners, and gates. According to the temperature of the medium inside the runner system, it can be divided into hot runners and cold runners.

[0057] It should be noted that the configuration of the flow channel system is not limited in this embodiment. For example, the main flow channel can be set at the center of the mold and the opening of the main flow channel can be set as a cone shape, which facilitates the connection of the nozzle.

[0058] Furthermore, the configuration of the cooling water circuit is not limited in this embodiment. For example, cooling water pipes, spray pipes, or baffles can be selected. Cooling water pipes offer the best cooling effect and are therefore preferred. However, in some locations where there is insufficient space to arrange cooling water pipes, spray pipes or baffles can be chosen. It should be noted that after constructing the cooling water circuit system, the water inlet location and cooling water temperature must also be determined.

[0059] With the above settings, an analytical model for simulating the injection deformation of injection-molded plastic parts has been constructed. For example, refer to... Figure 11 This is a schematic diagram of an analysis model constructed using the interior trim panel of a vehicle door as an example. Specifically, in... Figure 11 In the diagram, 'a' represents the flow channel system, 'b' represents the cooling water system, and 'c' represents the 3D model of the door interior panel.

[0060] Step S13: Configure the process parameters of the analysis model and perform simulation analysis to determine the simulated deformation of the analysis model.

[0061] After constructing the analysis model for simulating the injection deformation of injection-molded plastic parts in the aforementioned steps, the simulation analysis can be performed after configuring the process parameters of the analysis model.

[0062] Specifically, the material parameters of the injection-molded plastic part can be set according to the material of the injection-molded plastic part, but this application embodiment does not limit this.

[0063] Alternatively, the analysis type can be set to cooling + filling + holding pressure + warpage. Then follow the process setup wizard to make the settings.

[0064] After setting the above process parameters, the job can be submitted for mold flow analysis. It should be noted that after mold flow analysis, various analysis results can be viewed, such as flow results, cooling analysis results, or warpage deformation analysis results. In this embodiment, the focus is on the deformation of the injection-molded plastic part during the injection molding process, and the simulated deformation amount of the analysis model can be determined based on the simulation analysis results.

[0065] For example, the simulated deformation amount of the analysis model can be obtained by obtaining the deformation cloud map of the three-dimensional model of the injection-molded plastic part based on the results of the simulation analysis.

[0066] For example, refer to Figure 13 The results are analyzed using the door interior panel as an example.

[0067] Step S14: Based on the simulated deformation and the position of the mounting structure used by the three-dimensional model for fixed connection with the vehicle body, determine the calibration deformation of the three-dimensional model.

[0068] It should be noted that since injection-molded plastic parts of a vehicle need to be connected to other parts of the vehicle body, they generally have mounting structures on them for fixed connection to the vehicle body. Injection-molded plastic parts typically have a certain degree of deformability and can be approximated as flexible components. After the injection-molded plastic part is fixedly connected to the vehicle body using the aforementioned mounting structure, the simulated deformation amount obtained from the analysis model cannot be considered the actual deformation amount of the injection-molded plastic part after it is installed on the vehicle body due to the limitation imposed by the mounting structure.

[0069] For example, interior door panels are typically secured to the door using snap-fit ​​posts. Even if the interior door panel has some deformation at or near the snap-fit ​​post location, the snap-fit ​​post will still limit its movement and apply external force to it, forcing it to fit snugly against the door.

[0070] Considering the above situation, in the design method provided in this application embodiment, the calibration deformation amount of the three-dimensional model is determined by analyzing the position of the mounting structure for fixed connection with the vehicle body provided on the injection-molded deformable part and the simulated deformation amount of the injection-molded plastic part obtained in the aforementioned steps.

[0071] For example, the deformation of the installation structure can be obtained from the position of the installation structure corresponding to the simulated deformation of the analysis model, such as... Figure 15 As shown. By comparing the deformation of the installation structure with the deformation of the target position in the 3D model, the calibration deformation of the target position in the 3D model can be obtained.

[0072] It should be noted that, in this embodiment, the method of comparing the deformation of the installation structure with the deformation of the target position of the 3D model is not limited. For example, direct comparison, percentage comparison, logarithmic comparison, or exponential comparison methods can be used to compare the deformation of the installation structure with the deformation of the target position of the 3D model. Furthermore, the calibration deformation of the 3D model can be determined based on the numerical values ​​corresponding to the above comparison results.

[0073] Step S15: If the calibration deformation is greater than a preset threshold, modify the three-dimensional model and repeat the above steps until the calibration deformation is less than or equal to the preset threshold.

[0074] Here, based on the calibration deformation amount determined in the aforementioned steps, a preset threshold is set to compare with the calibration deformation amount in order to determine the magnitude of the calibration deformation amount.

[0075] It should be noted that, in this embodiment, the specific value of the preset threshold is not limited, and it can be set according to the installation accuracy of the injection-molded plastic part on the vehicle body. For example, when the requirements for the assembly gap or surface difference between the injection-molded plastic part and other parts of the vehicle body are high, the preset threshold can be set to a smaller value; when the requirements for the assembly gap or surface difference between the injection-molded plastic part and other parts of the vehicle body are low, the preset threshold can be set to a larger value.

[0076] Additionally, it should be noted that the aforementioned preset threshold can also represent the permissible degree of deformation of the injection-molded plastic part. If the aforementioned calibrated deformation is less than or equal to the preset threshold, the deformation of the injection-molded plastic part can be considered to be within the permissible range; if the aforementioned calibrated deformation is greater than the preset threshold, the calibrated deformation of the injection-molded plastic part can be considered to exceed the permissible range.

[0077] In this case, if the calibration deformation is greater than the preset threshold, the three-dimensional model can be modified based on the calibration deformation, and the above steps S11 to S14 can be repeated until the calibration deformation is less than or equal to the preset threshold.

[0078] In the design method for injection-molded plastic parts of vehicles provided in this application embodiment, a three-dimensional model of the injection-molded plastic part is drawn, and an analysis model for simulating the injection deformation of the injection-molded plastic part is constructed. By analyzing the analysis model, the simulated deformation amount of the analysis model can be obtained. This simulated deformation amount can characterize the deformation amount of the injection-molded plastic part before it is installed on the vehicle body. Simultaneously, considering the actual situation of the constraint of the mounting structure on the injection-molded plastic part after it is installed on the vehicle body, a calibration deformation amount of the three-dimensional model is obtained based on the aforementioned simulated deformation amount and the relative position of the mounting structure on the injection-molded plastic part. The calibration deformation amount is then compared with a preset threshold. If the calibration deformation amount is greater than the preset threshold, the three-dimensional model is modified based on the calibration deformation amount. In this way, the design method of vehicle injection-molded plastic parts provided in this application embodiment can be matched with the actual situation of injection-molded plastic parts installed on vehicles. This allows the calibration deformation amount to more accurately represent the actual deformation amount of the injection-molded plastic parts after they are installed on the vehicle body. Furthermore, by modifying the three-dimensional model based on the reference deformation amount and repeating the above steps, the calibration deformation amount can be made less than or equal to a preset threshold, so that the deformation amount of the injection-molded plastic parts meets the requirements.

[0079] Furthermore, it should be noted that for injection-molded plastic parts, the edges are where the deformation is greatest. Therefore, in the design method for injection-molded plastic parts provided in this application embodiment, the deformation of the edges of the injection-molded plastic parts is also used as the target object to evaluate the deformation of the injection-molded plastic parts. Moreover, for injection-molded plastic parts for vehicles, the edges of the injection-molded plastic parts are generally used as the measurement object to measure the surface difference and gap between the injection-molded plastic parts and other parts of the vehicle body.

[0080] Therefore, embodiments of this application also provide a design method for injection-molded plastic parts for vehicles, referring to... Figure 2 This is a flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, as provided in an embodiment of this application. Figure 2 As shown, the method includes steps S21 to S27, wherein:

[0081] Step S21: Draw a three-dimensional model of the injection-molded plastic part.

[0082] Step S22: Based on the three-dimensional model, construct an analysis model for simulating the injection deformation of the injection-molded plastic part.

[0083] Step S23: Configure the process parameters of the analysis model and perform simulation analysis to determine the simulated deformation of the analysis model.

[0084] Here, steps S21 to S23 correspond to steps S11 to S13. In implementation, the specific implementation of steps S11 to S13 can be referred to.

[0085] Step S24: Based on the simulated deformation, obtain the first sub-simulated deformation of the edge of the three-dimensional model.

[0086] Based on the simulated deformation of the analysis model determined in the aforementioned steps, the simulated deformation at any position of the analysis model can be obtained. In this embodiment, the edge of the three-dimensional model can be used to represent the position of maximum deformation of the three-dimensional model. Therefore, only the edge of the three-dimensional model can be selected to obtain the simulated deformation of the edge of the three-dimensional model. For ease of distinction, the simulated deformation of the edge of the three-dimensional model is referred to here as the first sub-simulated deformation.

[0087] It should be noted that the edges of the 3D model correspond to the edges of the main structure of the injection-molded plastic part. For example, refer to... Figure 7 For example, if the injection-molded plastic part is a door interior panel, the edge of the 3D model can correspond to the flange of the door interior panel edge.

[0088] Additionally, it should be noted that the first sub-simulated deformation amount mentioned above can characterize the deformation amount of the edge of the injection-molded plastic part before it is installed on the vehicle body.

[0089] Step S25: Based on the simulated deformation, obtain the second sub-simulated deformation of the mounting structure of the three-dimensional model for fixed connection with the vehicle body.

[0090] It should be noted that when drawing the 3D model of the injection-molded plastic part in the aforementioned steps, the position of the mounting structure can be drawn; alternatively, the position of the mounting structure can be omitted, and it is sufficient to know the position of the mounting structure relative to the injection-molded plastic part.

[0091] In this way, based on the aforementioned steps, we can obtain the simulated deformation amount at any position of the analysis model. Alternatively, we can obtain the simulated deformation amount of the installation structure based on its position or its position relative to the injection-molded plastic part. For ease of distinction, the simulated deformation amount of the installation structure is referred to as the second sub-simulated deformation amount.

[0092] For example, refer to Figures 8 to 10 For example, if the injection-molded plastic part is a door interior panel, the mounting structure 13 may include a snap-fit ​​hole 131 and a snap-fit ​​post 132 provided in the door interior panel 1.

[0093] It should be noted that the second sub-simulated deformation mentioned above can characterize the deformation of the injection-molded plastic part's mounting structure before it is installed on the vehicle body.

[0094] Step S26: Based on the first sub-simulated deformation amount and the second sub-simulated deformation amount, obtain the calibration deformation amount of the edge of the three-dimensional model.

[0095] Based on the first sub-simulated deformation amount of the edge of the three-dimensional model and the second simulated deformation amount of the installation structure obtained in the aforementioned steps, the calibration deformation amount of the edge of the three-dimensional model can be obtained by comparing the first sub-simulated deformation amount and the second simulated deformation amount.

[0096] It should be noted that the comparison method between the first simulated deformation and the second simulated variable is not limited in this embodiment. For example, direct comparison, percentage comparison, logarithmic comparison, or exponential comparison methods can be used to compare the first simulated deformation and the second simulated deformation. Furthermore, the calibration deformation of the edges of the 3D model can be determined based on the numerical values ​​corresponding to the comparison results.

[0097] Here, the calibration deformation of the edge of the 3D model can characterize the deformation of the edge of the injection-molded plastic part after it is installed on the vehicle body.

[0098] Step S27: If the calibration deformation is greater than a preset threshold, modify the three-dimensional model and repeat the above steps until the calibration deformation is less than or equal to the preset threshold.

[0099] Here, step S27 corresponds to step S15 mentioned above. In implementation, the specific implementation method of step S15 mentioned above can be referred to.

[0100] Thus, in the design method for injection-molded plastic parts of vehicles provided in this application embodiment, the edge of the three-dimensional model with the largest deformation is used to characterize the overall maximum deformation of the three-dimensional model. The first sub-simulated deformation of the edge of the three-dimensional model and the second sub-simulated deformation of the mounting structure position are compared to obtain the calibrated deformation of the edge of the three-dimensional model. This simplifies the analysis process of the three-dimensional model and accurately characterizes the deformation of the three-dimensional model.

[0101] Compared to comparison methods such as percentage comparison, logarithmic comparison, or exponential comparison to compare the first and second simulated deformations, the direct comparison method is simpler and more intuitive.

[0102] Therefore, this application also provides a method for comparing the first simulated deformation amount and the second simulated deformation amount using a direct comparison method.

[0103] Therefore, embodiments of this application also provide a design method for injection-molded plastic parts for vehicles, referring to... Figure 3This is a flowchart illustrating the implementation of a design method for injection-molded plastic parts for vehicles, as provided in an embodiment of this application. Figure 3 As shown, the method includes steps S31 to S38, wherein:

[0104] Step S31: Draw a three-dimensional model of the injection-molded plastic part.

[0105] Step S32: Based on the three-dimensional model, construct an analysis model for simulating the injection deformation of the injection-molded plastic part.

[0106] Step S33: Configure the process parameters of the analysis model and perform simulation analysis to determine the simulated deformation of the analysis model.

[0107] Step S34: Based on the simulated deformation amount, obtain the first sub-simulated deformation amount of the edge of the three-dimensional model.

[0108] Step S35: Based on the simulated deformation, obtain the second sub-simulated deformation of the mounting structure of the three-dimensional model for fixed connection with the vehicle body.

[0109] Here, steps S31 to S35 above correspond to steps S21 to S25 above. In implementation, the specific implementation of steps S21 to S25 above can be referred to.

[0110] Step S36: Subtract the second sub-simulated deformation from the first sub-simulated deformation to obtain the difference between the first sub-simulated deformation and the second sub-simulated deformation.

[0111] Here, in the design method for injection-molded plastic parts of vehicles provided in this application embodiment, a direct comparison method is used to compare the first sub-simulated deformation amount and the second sub-simulated deformation amount. Specifically, the difference between the first sub-simulated deformation amount and the second sub-simulated deformation amount is obtained by subtracting the second sub-simulated deformation amount from the first sub-simulated deformation amount.

[0112] It should be noted that since the first sub-simulated deformation represents the simulated deformation of the edge of the injection-molded plastic part, and the second sub-simulated deformation represents the simulated deformation of the mounting structure set on the injection-molded plastic part, the mounting structure is generally set on the inside of the injection-molded plastic part relative to the edge of the injection-molded plastic part. Therefore, the first sub-simulated deformation is generally greater than the second sub-simulated deformation.

[0113] Here, the first simulated deformation amount can be understood as a specific numerical value, and the second simulated deformation amount can be understood as a specific numerical value. By subtracting the second sub-simulated deformation amount from the first sub-simulated deformation amount, the difference between the first sub-simulated deformation amount and the second sub-simulated deformation amount can be obtained.

[0114] Step S37: Use the difference as the calibration deformation amount.

[0115] It should be noted that after the injection-molded plastic part is installed on the vehicle body, the deformation at the installation structure is essentially zero due to the limiting effect of the installation structure. Therefore, based on the above analysis, when simulating the deformation of other parts of the injection-molded plastic part, the deformation at other locations needs to be calibrated according to the position of the installation structure.

[0116] Therefore, in the design method of injection-molded plastic parts for vehicles provided in the embodiments of this application, the difference between the first sub-simulated deformation amount and the second sub-simulated deformation amount is used as the calibration deformation amount of the edge of the three-dimensional model.

[0117] Step S38: If the calibration deformation is greater than a preset threshold, modify the three-dimensional model and repeat the above steps until the calibration deformation is less than or equal to the preset threshold.

[0118] Here, step S38 corresponds to step S27 mentioned above. In implementation, the specific implementation method of step S27 mentioned above can be referred to.

[0119] Thus, in the design method of injection-molded plastic parts for vehicles provided in this application embodiment, the difference between the first simulated deformation amount and the second simulated deformation amount is obtained by direct comparison, and the difference is used as the calibration deformation amount of the edge of the three-dimensional model. This makes the design method of injection-molded plastic parts for vehicles provided in this application embodiment simple and intuitive, and can realistically simulate the deformation amount of the injection-molded plastic parts after they are installed on the vehicle body.

[0120] Based on this, refer to Figure 4 In some embodiments of this application, step S38 described above can be implemented with reference to steps S381 and S382, wherein:

[0121] Step S381: If the calibration deformation amount is greater than a preset threshold, adjust the contour of the edge of the three-dimensional model by the value represented by the difference, so that the edge of the three-dimensional model is oriented in the opposite direction of the deformation direction of the edge of the three-dimensional model.

[0122] Here, the calibration deformation magnitude characterizes the assembly gap between the injection-molded plastic part and the vehicle body after the part is installed. If the calibration deformation magnitude exceeds a preset threshold, it indicates that the assembly gap between the injection-molded plastic part and the vehicle body exceeds the allowable value. The 3D model can be modified based on the calibration deformation magnitude.

[0123] For ease of description, the original 3D model before adjustment will be referred to as the original 3D model, and the 3D model after adjustment will be referred to as the modified 3D model.

[0124] First, based on the original 3D model, an analysis model for simulating injection-molded plastic parts is constructed and analyzed to obtain the calibration deformation of the edges of the 3D model.

[0125] By adjusting the original 3D model based on the calibration deformation of the edges of the 3D model, a modified 3D model can be obtained.

[0126] When modifying the original 3D model, the edges of the 3D model are adjusted in the opposite direction of the deformation direction. Specifically, the position of the edges of the 3D model is adjusted in the opposite direction of the deformation direction, represented by the difference between the first and second sub-simulated deformation values.

[0127] For example, refer to Figure 13 Taking the door interior panel as an example, in Figure 13 In the reference frame, the edge of the door interior panel warps in the +Z direction. When modifying the 3D model, the edge of the door interior panel is modified in the -Z direction according to the value of the calibration deformation.

[0128] Step S382: Smoothly connect the outline of the edge of the three-dimensional model to other parts to obtain the modified three-dimensional model.

[0129] Based on the modification of the outline of the edge of the 3D model in the aforementioned steps, the outline of the edge of the 3D model is then smoothly connected to other parts of the 3D model to obtain the modified 3D model.

[0130] By repeating the above steps, the calibration deformation can be made to be less than or equal to the preset threshold.

[0131] At this point, the mold for injection molding can be made based on the size and shape of the final three-dimensional model, thus obtaining an injection-molded plastic part that corresponds to the final three-dimensional model.

[0132] Furthermore, it should be noted that the edges of a 3D model are also composed of many consecutive points. When examining the first simulated deformation of the edges of a 3D model, representative reference points are generally selected. It should be noted that in this embodiment, the selection of the aforementioned representative reference points is not limited; for example, refer to... Figure 14 Taking injection-molded plastic parts as door interior panels as an example, multiple reference points can be selected at certain intervals along the edge of the door interior panel. Figure 14(Six reference points are shown in the image). Alternatively, multiple mounting structures can be set on the injection-molded plastic part to better securely connect it to the vehicle body. In this case, the reference points can be calibrated according to their distance from the mounting structures, with the nearest mounting structure being the nearest reference point, to obtain the calibration deformation amount corresponding to the aforementioned reference points. This yields discrete calibration deformation amounts corresponding to the multiple reference points. Then, a second reference point is created in the opposite direction of the deformation direction of the 3D model from the original reference point's location. These second reference points are also discrete, allowing for smooth connection before modifying the 3D model.

[0133] For example, refer to Figure 14 In one embodiment of this application, taking a door interior panel as an example, the simulated deformation amounts of six reference points selected at certain intervals along the edge of the door interior panel are as follows: first reference point 1.165mm, second reference point 1.581mm, third reference point 2.094mm, fourth reference point 1.998mm, fifth reference point 1.304mm, and sixth reference point 0.3344mm. (Refer to...) Figure 15 The simulated deformation of the mounting structure corresponding to the aforementioned reference points is 1.7 mm. Based on the simulated deformation of the reference points and the mounting structure, the differences between the simulated deformation of the third and fourth reference points and the simulated deformation of the mounting structure are both greater than zero. This is equivalent to the calibration deformation of the third and fourth reference points being greater than zero. Therefore, it can be assumed that after the injection-molded plastic part is installed onto the vehicle body, a gap will occur between the positions corresponding to the third and fourth reference points and the vehicle body.

[0134] Based on this, in the design method for injection-molded plastic parts of vehicles provided in this application embodiment, the process parameters used for injection molding simulation include various categories, such as injection time, injection pressure, holding time, or cooling time. The simulation of the deformation amount of the analysis model is closely related to the process parameters; different process parameters may lead to significant deviations in the simulation results. Therefore, when simulating the deformation amount of injection-molded plastic parts of vehicles provided in this application embodiment, the process parameters can be changed multiple times to determine the optimal process parameters.

[0135] For this, refer to Figure 5 In some embodiments of this application, step S13 described above can be implemented by the following steps S13a1 to S13a5, wherein:

[0136] Step S13a1: Configure the material parameters of the analysis model.

[0137] It should be noted that the material parameters of the analysis model can be determined based on the specific material of the injection-molded plastic part. For example, taking a door interior panel as an example, door interior panels can generally be made of materials such as polypropylene or polyurethane. In this case, the material parameters of the analysis model can be configured according to polypropylene or polyurethane.

[0138] It should be noted that when using Moldflow for simulation analysis, Moldflow provides three different material quality indicators for different simulation analysis requirements: the fill quality indicator, the pressure holding quality indicator, and the warpage quality indicator. The fill quality indicator is used to indicate the quality of the material's viscosity, specific heat capacity, and thermal conductivity data; the pressure holding quality indicator covers the quality of the results of the fill quality indicator and the quality of the relationship between the material's pressure, volume, and temperature (PVT curve); and the warpage quality indicator covers the applicability of the pressure holding quality indicator as well as the "mechanical properties" and "shrinkage" data.

[0139] Furthermore, each of the above indicators can be assigned a "Gold," "Silver," or "Bronze" rating based on the following criteria: the testing methods used to generate the property values ​​for each material, the completeness of the material properties required for the analysis type, and the progress of testing completion. Specifically, a "Gold" rating indicates high reliability of the material parameters used in the analysis. Materials with a "Gold" rating can be used when precise analytical results are required; "Silver" ratings are obtained by combining carefully tested supplementary material data; and "Bronze" ratings can reflect problems such as incomplete datasets, excessive use of supplementary data, and untested material properties.

[0140] In this embodiment of the application, the filling quality indicator, the holding pressure quality indicator, and the warpage quality indicator can all be set to the "gold" level. This also indicates that the corresponding material parameters, such as viscosity, specific heat capacity and thermal conductivity, PVT curve, "mechanical properties" and "shrinkage" data, have all been tested at multiple points.

[0141] Step S13a2: Configure the injection molding parameters of the analysis model.

[0142] In addition to configuring the material parameters as described above, the injection parameters of the analysis model also need to be configured in order to realistically simulate the injection molding process.

[0143] Here, injection parameters can be used to simulate some parameters in the real injection molding process, such as filling time, holding pressure curve, melt temperature, mold surface temperature and ambient temperature, as well as some parameters of the injection molding machine, such as maximum injection molding machine injection formation, maximum injection rate, screw diameter, maximum injection pressure and clamping force.

[0144] For example, when using Moldflow for simulation analysis, the process setup wizard can be used to set the injection + holding pressure + cooling times, then the filling + holding pressure settings, including filling time, holding pressure curve, melt temperature, mold surface temperature, ambient temperature, and for the injection molding machine, the maximum injection stroke, maximum injection rate, screw diameter, maximum injection pressure, and clamping force need to be set. In addition, settings for the mold material are required, such as density, specific heat, thermal conductivity, elastic modulus, Poisson's ratio, and coefficient of thermal expansion. Furthermore, warpage settings are necessary, requiring options to consider mold thermal expansion, separation warpage causes, and angular effects.

[0145] It should be noted that for other analysis software, the user manuals of the relevant software can be consulted for setup, and this application does not limit the implementation of such software.

[0146] Step S13a3: Perform simulation analysis on the analysis model to obtain the first simulated deformation of the analysis model.

[0147] After configuring the material and injection molding parameters of the analysis model in the aforementioned steps, mold flow analysis can be performed on the analysis model.

[0148] After the analysis of the model is completed, the simulated deformation of the model can be obtained based on the analysis results. For ease of description, the simulated deformation at this point is referred to as the first simulated deformation.

[0149] In step S13a4, the injection parameters of the analysis model are changed multiple times and analyzed to obtain multiple second simulated deformations corresponding to the injection parameters.

[0150] Referring to the foregoing explanation, since there are multiple options for configuring injection molding parameters, different configuration parameters have a significant impact on the analysis results. Specifically, the magnitude of the simulated deformation of the 3D model may differ under different injection molding parameters. Therefore, the injection molding parameters corresponding to smaller simulated deformations can be referred to as the optimal injection molding parameters. In the design method for vehicle injection-molded plastic parts provided in this application embodiment, the injection molding parameters of the analysis model can be changed multiple times, and multiple corresponding simulated deformations can be obtained respectively. For ease of description, the simulated deformation at this time is referred to as the second simulated deformation.

[0151] It should be noted that the injection molding parameters here also include the settings of the runner system and the cooling water system mentioned above.

[0152] Specifically, based on the flow results such as fill patterns, weld lines, and cavitation in the analysis model, as well as the warpage analysis results, it can be determined whether the fill sequence settings of the runner system are optimal. If not, the opening sequence of each gate needs to be re-determined until the optimal fill sequence is found. Simultaneously, the cooling water system settings can be referenced. Based on the loop coolant temperature, loop Reynolds number, and part temperature, it can be determined whether the cooling water system effectively cools the product. If the product's local temperature is too high, or the temperature difference between the coolant inlet and outlet is large, additional cooling loops need to be added until a cooling water system that meets the requirements is designed.

[0153] Step S13a5: The minimum value among the first simulated deformation and the plurality of second simulated deformations is taken as the simulated deformation.

[0154] Based on this, the minimum value among the first simulated deformation and multiple second simulated deformations is taken as the simulated deformation.

[0155] This also indicates that the injection molding parameters corresponding to the simulation analysis of the minimum value among the first simulated deformation and multiple second simulated deformations are the optimal injection molding parameters.

[0156] In this way, the simulated deformation amount described above can be used for subsequent steps.

[0157] Furthermore, different injection speeds can also affect the analysis results of the analytical model. Therefore, referring to... Figure 6 In some embodiments of this application, step S13 described above can also be implemented by the following steps S13b1 to S13b6, wherein:

[0158] Step S13b1: Configure the material parameters of the analysis model.

[0159] Step S13b2: Configure the injection molding parameters of the analysis model.

[0160] Step S13b3: Perform simulation analysis on the analysis model to obtain the first simulated deformation of the analysis model.

[0161] In step S13b4, the injection parameters of the analysis model are changed multiple times and analyzed to obtain multiple second simulated deformations corresponding to the injection parameters.

[0162] Here, steps S13b1 to S13b4 correspond to steps S13a1 to S13a4. In implementation, the specific implementation methods of steps S13a1 to S13a4 can be referred to.

[0163] Step S13b5: Based on the minimum value among the first simulated deformation and a plurality of second simulated deformations, generate a first injection speed corresponding to the minimum value.

[0164] It should be noted that the construction process during the actual production of injection-molded plastic parts is not exactly the same as the process during the analysis of the analytical model. Therefore, the corresponding injection speed needs to be generated based on the optimal injection parameters. For ease of description, the injection speed at this time is referred to as the first injection speed.

[0165] The optimal injection molding parameters can be determined according to the description in step S13a5.

[0166] Specifically, based on the first simulated deformation and multiple second simulated deformation obtained in the aforementioned steps, the minimum value of the first simulated deformation and multiple second simulated deformation can be obtained. The injection molding parameters corresponding to the simulation analysis of the minimum value among the first simulated deformation and multiple second simulated deformation are the optimal injection molding parameters.

[0167] Based on this, analysis software can be used to generate the first injection speed. For the injection molding machine, the injection speed can be represented by an XY graph of the recommended screw speed.

[0168] Step S13b6: Modify the injection speed in the injection parameters to the first injection speed, and re-analyze the analysis model to obtain the second simulated deformation of the analysis model.

[0169] Based on the first injection speed obtained in the aforementioned steps, the injection speed in the injection parameters of the aforementioned steps is modified to the first injection speed, and the analysis model is re-analyzed to obtain the second simulated deformation of the analysis model.

[0170] Specifically, refer to Figure 12 Taking Moldflow as an example, you can set the speed-position curve or speed-injection volume curve for the filling stage during actual injection molding in segments. Then, fill this curve into the process setup wizard – filling + holding pressure settings – filling control – selecting relative screw speed curve, and input the actual process parameters in the curve editing section. Finally, re-analyze the analysis model to obtain the second simulated deformation amount of the analysis model.

[0171] Step S13b7: Use the second simulated deformation amount as the simulated deformation amount.

[0172] Thus, the second simulated deformation obtained in the aforementioned steps is used as the simulated deformation for subsequent steps.

[0173] Based on the design method for injection-molded plastic parts of vehicles provided in the foregoing description, this application embodiment also provides an injection-molded plastic part for vehicles, specifically, the injection-molded plastic part is designed using the aforementioned design method.

[0174] It should be noted that, based on the modified 3D model obtained from the aforementioned design method, the modified 3D model can be used to guide the design and fabrication of the mold, thereby enabling the production of a mold consistent with the modified 3D model. Furthermore, this mold can be used to produce the injection-molded plastic parts described in the embodiments of this application.

[0175] Based on this, in some embodiments of this application, an mounting structure is also provided on the injection-molded plastic part, specifically, see [reference]. Figures 7 to 10 The mounting structure 13 includes a snap-fit ​​hole 131 and a snap-fit ​​post 132. The snap-fit ​​hole 131 is formed on the injection-molded plastic part, and the snap-fit ​​post 132 is provided with a first snap-fit ​​portion 1321 and a second snap-fit ​​portion 1322. The first snap-fit ​​portion 1321 snaps into the snap-fit ​​hole 131 on the injection-molded plastic part, and the second snap-fit ​​portion 1322 is used to snap onto the vehicle body 2. Furthermore, during the process of the second snap-fit ​​portion 1322 snapping onto the vehicle body 2, it can cause the injection-molded plastic part to deform towards the vehicle body.

[0176] For example, refer to Figure 10 The above settings will be explained using injection-molded plastic parts as door interior panels as an example.

[0177] First, assuming that when connecting the injection-molded plastic part to the vehicle body without using snap-fit ​​posts, there is a theoretical gap between the injection-molded plastic part at the snap-fit ​​hole position and the corresponding position on the vehicle body. To address this, the distance between the first and second snap-fit ​​parts can be modified to be smaller than the aforementioned theoretical gap, effectively creating an interference value between the snap-fit ​​hole and the vehicle body. For example, this interference value can be set to 0.5 mm. Thus, after installing the injection-molded plastic part onto the vehicle body using snap-fit ​​posts, it is equivalent to applying pressure near the snap-fit ​​hole, resulting in a tighter fit between the injection-molded plastic part and the vehicle body.

[0178] Additionally, in some embodiments of this application, reference is made to Figure 7 The injection-molded plastic part includes a first extended surface 11 and a second extended surface 12, which are not on the same plane. The first extended surface 11 is used to abut against the vehicle body. The thickness of the connection between the first extended surface 11 and the second extended surface 12 is less than the thickness of either the first extended surface 11 or the second extended surface 12.

[0179] For example, the above settings will be explained using injection-molded plastic parts as door interior panels.

[0180] The first extended surface can be considered as the flange provided on the door interior panel, and the second extended surface can be considered as the connecting plate provided in the direction corresponding to the width of the vehicle body. The connection position within the bracket of the first and second extended surfaces is the arc-shaped connection structure between the connecting plate and the flange. Therefore, the thickness of the arc-shaped structure can be set to be less than the thickness of either the flange or the arc-shaped connection structure; for example, the thickness of the arc-shaped connection structure can be reduced by 10% to 15% relative to the thickness of the flange or the connecting plate.

[0181] In this way, the above-mentioned configuration can improve the deformation capacity between the first and second extended surfaces, better enable the injection-molded plastic parts to fit the vehicle body, and also reduce the contact force between the injection-molded plastic parts and the vehicle body.

[0182] Based on this, this application also provides a vehicle that includes the aforementioned injection-molded plastic parts.

[0183] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A design method for injection-molded plastic parts for vehicles, characterized in that, The method includes: Draw a 3D model of the injection-molded plastic part; Based on the three-dimensional model, an analytical model is constructed to simulate the injection deformation of the injection-molded plastic part; Configure the process parameters of the analysis model and perform simulation analysis to determine the simulated deformation of the analysis model; Based on the simulated deformation and the position of the mounting structure used by the three-dimensional model for fixed connection with the vehicle body, the calibration deformation of the three-dimensional model is determined. If the calibration deformation exceeds a preset threshold, the 3D model is modified, and the above steps are repeated until the calibration deformation is less than or equal to the preset threshold. The determination of the calibration deformation of the three-dimensional model based on the simulated deformation and the position of the mounting structure used for fixed connection with the vehicle body includes: Based on the simulated deformation, a first sub-simulated deformation of the edge of the 3D model is obtained; the simulated deformation of the edge of the 3D model is referred to as the first sub-simulated deformation. Based on the simulated deformation, the second sub-simulated deformation of the mounting structure used by the three-dimensional model for fixed connection with the vehicle body is obtained; the simulated deformation of the mounting structure is called the second sub-simulated deformation. Based on the first sub-simulated deformation and the second sub-simulated deformation, the calibration deformation of the edge of the three-dimensional model is obtained.

2. The method according to claim 1, characterized in that, The step of obtaining the calibration deformation of the edges of the 3D model based on the first sub-simulated deformation and the second sub-simulated deformation includes: Subtract the second sub-simulated deformation from the first sub-simulated deformation to obtain the difference between the first sub-simulated deformation and the second sub-simulated deformation. The difference is used as the calibration deformation amount of the edge of the three-dimensional model.

3. The method according to claim 2, characterized in that, The modification of the three-dimensional model when the calibration deformation exceeds a preset threshold includes: If the calibration deformation amount is greater than a preset threshold, the contour of the edge of the three-dimensional model is adjusted by the value represented by the difference, in the opposite direction of the deformation direction of the edge of the three-dimensional model. The edges of the 3D model are smoothly connected to other parts to obtain the modified 3D model.

4. The method according to claim 1, characterized in that, The process parameters of the analysis model are configured and simulation analysis is performed to determine the simulated deformation of the analysis model, including: Configure the material parameters of the analysis model; Configure the injection molding parameters of the analysis model; The analysis model is simulated and analyzed to obtain the first simulated deformation of the analysis model; The injection molding parameters of the analysis model were changed multiple times and analyzed to obtain multiple second simulated deformation amounts corresponding to the injection molding parameters. The minimum value among the first simulated deformation and a plurality of second simulated deformations is taken as the simulated deformation.

5. The method according to claim 1, characterized in that, The process parameters of the analysis model are configured and simulation analysis is performed to determine the simulated deformation of the analysis model, including: Configure the material parameters of the analysis model; Configure the injection molding parameters of the analysis model; The analysis model is simulated and analyzed to obtain the first simulated deformation of the analysis model; The injection molding parameters of the analysis model were changed multiple times and analyzed to obtain multiple second simulated deformation amounts corresponding to the injection molding parameters. Based on the minimum value among the first simulated deformation and multiple second simulated deformations, a first injection speed corresponding to the minimum value is generated; The injection speed in the injection parameters is modified to the first injection speed, and the analysis model is re-analyzed to obtain the second simulated deformation of the analysis model; The second simulated deformation amount is used as the simulated deformation amount.

6. A vehicle injection-molded plastic part, characterized in that, It is designed using the design method described in any one of claims 1 to 5.

7. The injection-molded plastic part for a vehicle according to claim 6, characterized in that, The injection-molded plastic part is provided with an installation structure, which includes a snap-fit ​​hole and a snap-fit ​​post. The snap-fit ​​hole is formed on the injection-molded plastic part, and the snap-fit ​​post is provided with a first snap-fit ​​part and a second snap-fit ​​part. The first snap-fit ​​part snaps into the snap-fit ​​hole, and the second snap-fit ​​part is used to snap onto the vehicle body. During the process of the second snap-fit ​​part snapping onto the vehicle body, it can drive the snap-fit ​​hole to deform toward the vehicle body.

8. The injection-molded plastic part for a vehicle according to claim 6, characterized in that, The injection-molded plastic part includes a first extended surface and a second extended surface. The first extended surface and the second extended surface are not on the same plane. The first extended surface is used to abut against the vehicle body. The thickness of the connection position between the first extended surface and the second extended surface is less than the thickness of either the first extended surface or the second extended surface.

9. A vehicle, characterized in that, Injection-molded plastic parts of the vehicle as described in any one of claims 6 to 8.

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