Torque determination method and device for plastic material and screw material tightening fit

Abstract

The application provides a torque determination method and device for screw material and plastic material screwing cooperation, and relates to the technical field of screwing torque determination, and comprises the following steps: applying a maximum impact force corresponding to a target working condition to screw material to determine a minimum torque of the screw material under the target working condition, wherein the screw material and the plastic material have been screwed together; determining an axial force attenuation change amount of the screwing cooperation of the plastic material and the screw material under the influence of temperature change based on screw material parameters and plastic material parameters under different preset temperature working conditions; and determining a target torque for screwing cooperation under the target working condition according to the minimum torque and the axial force attenuation change amount, so as to solve the technical problem that the screwing cooperation of the plastic material and the screw material is prone to failure under temperature change.

Description

Technical Field

[0001] This invention relates to the technical field of tightening torque determination, and in particular to a method and apparatus for determining the torque for tightening fits between plastic materials and screws. Background Technology

[0002] Self-tapping screws are used in a wide range of applications, such as vehicle manufacturing, where they are tightened to fit plastic parts. In vehicle manufacturing, the tightness of this fit is particularly important for the safety and reliability of vehicle production applications.

[0003] However, the inventors discovered that due to the significant difference in thermal expansion and contraction between the plastic and screw materials, the axial force of the self-tapping screw on the plastic material weakens considerably when temperature changes occur during practical applications, leading to failure of the tightening fit. Therefore, determining a suitable torque to overcome the impact of temperature changes on the tightening fit of the plastic and screw materials has become an urgent technical problem to be solved. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and apparatus for determining the torque for tightening fit between plastic materials and screw materials, thereby alleviating the technical problem that the tightening fit between plastic materials and screw materials is prone to failure under temperature changes.

[0005] In a first aspect, embodiments provide a method for determining the torque for tightening fits between plastic materials and screw materials, the method comprising:

[0006] Apply the maximum impact force corresponding to the target working condition to the screw material, and determine the minimum torque of the screw material under the target working condition, wherein the screw material and the plastic material are already tightened together;

[0007] Based on the screw material parameters and plastic material parameters under different preset temperature conditions, the change in axial force attenuation under the influence of temperature changes is determined when the tightening fit of the plastic material and the screw material is made.

[0008] Based on the minimum torque and the change in axial force attenuation, the target torque for the tightening fit under the target operating condition is determined.

[0009] In an optional implementation, the step of determining the change in axial force attenuation of the tightening fit between the plastic material and the screw material under temperature changes, based on the screw material parameters and plastic material parameters under different preset temperature conditions, includes:

[0010] Based on the screw material parameters and plastic material parameters corresponding to each preset temperature condition, the first axial force attenuation of the clamped part and the thread used for tightening is determined under the influence of temperature change.

[0011] Based on the pore size of the plastic material and the driving depth of the screw under each preset temperature condition, the second axial force attenuation of the plastic material and the screw material under the combined influence of tightening and temperature change is determined.

[0012] Based on the first axial force attenuation and the second axial force attenuation, the change in axial force attenuation of the tightening fit between the plastic material and the screw material under the influence of temperature change is determined.

[0013] In an optional implementation, the step of determining the first axial force attenuation of the clamped part and the thread under the influence of temperature change, based on the screw material parameters and plastic material parameters corresponding to each preset temperature condition, includes:

[0014] Determine the first proportion of the torque of the clamped part used for tightening the fit in the total torque and the second proportion of the thread torque in the total torque respectively;

[0015] Based on the state of the clamped part under each preset temperature condition and the first proportion, determine the first axial force attenuation of the clamped part used for tightening under the influence of temperature change.

[0016] Based on the thread state under each preset temperature condition and the second proportion, the first axial force attenuation of the thread used for tightening is determined under the influence of temperature change.

[0017] In an optional implementation, the step of determining the first axial force attenuation of the clamped part used for tightening under the influence of temperature change, based on the state of the clamped part under each preset temperature condition and the first proportion, includes:

[0018] Based on the different force conditions at each position point in the clamped component, the clamped component is divided into multiple refined units;

[0019] Based on the state of each of the refined units under each preset temperature condition, the axial force attenuation of the clamped member is determined, wherein the clamped member is used to connect the screw material and the plastic material so that the screw material and the plastic material can be tightened together.

[0020] The first axial force attenuation of the clamped part under the influence of temperature change is obtained by multiplying the axial force attenuation of the clamped part by the first proportion.

[0021] In an optional implementation, the step of determining the first axial force attenuation of the thread used for tightening under the influence of temperature change, based on the thread state under each preset temperature condition and the second proportion, includes:

[0022] The axial force distribution surface of the thread is equivalent to a ring-shaped simply supported beam model, and the uniform load deflection of the thread is determined based on the ring-shaped simply supported beam model.

[0023] The axial force attenuation of the thread is determined based on the elastic coefficient and uniform load deflection under each preset temperature condition.

[0024] The first axial force attenuation of the thread under the influence of temperature change is obtained by multiplying the axial force attenuation of the thread by the second proportion.

[0025] In an optional implementation, the step of determining the second axial force attenuation of the plastic material and the screw material under the combined influence of tightening and temperature changes, based on the pore size of the plastic material and the driving depth of the screw under each preset temperature condition, includes:

[0026] The pore size of the plastic material under each preset temperature condition is determined by equating the change in pore size with the linear expansion of the pore wall circumference.

[0027] The driving depth of the screw under each preset temperature condition is determined based on the absolute difference between the change in the axial height of the plastic and the change in the z-axis length of the screw.

[0028] Based on the preset parameter table, the hole diameter, and the penetration depth, find the tightening torque of the plastic material and the screw material under temperature changes;

[0029] Based on the tightening torque, the amount of the second axial force attenuation under the combined influence of tightening fit and temperature change of the plastic material and the screw material is determined.

[0030] In an optional implementation, the step of applying the maximum impact force corresponding to the target working condition to the screw material and determining the minimum torque of the screw material under the target working condition includes:

[0031] By simulating collisions, the maximum impact force applied to the screw material under the target working conditions was determined;

[0032] Based on the maximum mechanical load corresponding to the maximum impact force, the axial force required by the screw material under the target working condition is determined;

[0033] Based on the axial force required under the target working condition, the minimum torque of the screw material under the target working condition is determined.

[0034] Secondly, the embodiments provide a torque determining device for tightening fits between plastic materials and screw materials, the device comprising:

[0035] The first determining module applies the maximum impact force corresponding to the target working condition to the screw material and determines the minimum torque of the screw material under the target working condition, wherein the screw material and the plastic material have been tightened together.

[0036] The second determining module determines the change in axial force attenuation under temperature changes based on the screw material parameters and plastic material parameters under different preset temperature conditions.

[0037] The third determining module determines the target torque for the tightening fit under the target working condition based on the minimum torque and the change in axial force attenuation.

[0038] Thirdly, an embodiment provides an electronic device including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the method described in any of the foregoing embodiments.

[0039] Fourthly, an embodiment provides a machine-readable storage medium storing machine-executable instructions, which, when invoked and executed by a processor, cause the processor to perform the steps of the method described in any of the foregoing embodiments.

[0040] This invention provides a method and apparatus for determining the torque for tightening a fit between plastic and screw materials. First, it determines the minimum torque required for the screw material to withstand the maximum impact force under target operating conditions. Second, based on the influence of different temperature conditions on the parameters of the screw and plastic materials, it obtains the change in axial force attenuation under such temperature variations. Then, it sums this change in axial force attenuation with the minimum torque to obtain the target torque under the target operating conditions. This target torque is adaptable to various temperature-changing application scenarios, ensuring the reliability of the tightening fit without needing to consider the negative impact of temperature changes on the tightening fit.

[0041] Other features and advantages of this disclosure will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above.

[0042] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a flowchart illustrating a method for determining the torque for tightening plastic and screw materials, as provided in an embodiment of the present invention.

[0045] Figure 2 This is a schematic diagram of a clamped component provided in an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of a thread provided for an embodiment of the present invention;

[0047] Figure 4 This is a functional block diagram of a torque determining device for tightening plastic and screw materials according to an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the hardware architecture of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The inventors have discovered that the tightening fit between plastic and screw materials is prone to failure under temperature changes, posing a threat to the actual production safety of the specific application of this tightening fit. For example, in vehicle applications, various components inside the vehicle may experience high or low temperatures. If the tightening fit between the plastic and screw materials fails under these temperature changes, it will significantly impact the vehicle's driving safety and reliability.

[0051] Based on this, the present invention provides a method and apparatus for determining the torque of a tightening fit between plastic and screw materials. By determining the axial force attenuation of the tightening fit between plastic and screw materials under temperature changes, a more reliable target torque is determined to ensure that the tightening fit affected by temperature changes will not fail.

[0052] To facilitate understanding of this embodiment, a method for determining the torque for tightening fit between plastic and screw materials, as disclosed in this embodiment of the invention, will be described in detail first. This method can be applied to intelligent control devices such as host computers, servers, and controllers. It can be used to determine the target torque under target working conditions before the production of plastic and screw materials for tightening fit, so as to ensure that the plastic and screw components produced according to the target torque have high application reliability. Alternatively, based on the target torque, the various models of plastic and screw components that have been produced can be selected and verified to select the corresponding components that meet the torque requirements and participate in the application under the target working conditions.

[0053] Figure 1 This is a flowchart illustrating a method for determining the torque for tightening plastic and screw materials, as provided in an embodiment of the present invention.

[0054] like Figure 1 As shown, the method includes the following steps:

[0055] Step S102: Apply the maximum impact force corresponding to the target working condition to the screw material to determine the minimum torque of the screw material under the target working condition.

[0056] At this point, the screw material and the plastic material are already in a tightened fit. In a scenario where there is no temperature change, the minimum torque that the screw material needs to meet is determined by applying the maximum impact force matching the target working condition to the screw. That is, if the screw material is less than this minimum torque, it cannot withstand the maximum impact force under the target working condition, and the screw material that does not meet the minimum torque cannot meet the requirements for production applications.

[0057] Step S104: Based on the screw material parameters and plastic material parameters under different preset temperature conditions, determine the change in axial force attenuation of the tightening fit between the plastic material and the screw material under the influence of temperature changes.

[0058] Here, screw material can be understood as screws and / or bolts in actual production applications, and plastic material can be understood as plastic and rubber, used to tighten with screw material; while screw material parameters and plastic material parameters can be understood as parameters that characterize the performance of screw and plastic themselves. These parameters may change with the temperature conditions, which may lead to failure of the tightening fit between screw material parameters and plastic material during temperature changes, resulting in low reliability.

[0059] It should be noted that, in order to address this type of problem, this embodiment of the invention determines the amount of change in axial force attenuation caused by the change in screw material parameters and plastic material parameters under the influence of such temperature changes, and based on this amount of change in axial force attenuation, a more reasonable and effective torque is re-determined to ensure safety in production applications.

[0060] Step S106: Determine the target torque for tightening the fit under the target working condition based on the minimum torque and the change in axial force attenuation.

[0061] Specifically, by adding the axial force attenuation changes of the plastic material and screw material under the influence of temperature changes to the minimum torque required under the target working conditions, the target torque for both materials is determined. Under the action of this target torque, the plastic material and screw material used for tightening can overcome the adverse effects of temperature changes on the tightening fit.

[0062] In a preferred embodiment of practical application, firstly, the minimum torque required by the screw material to withstand the maximum impact force under the target working condition is determined. Secondly, based on the influence of different temperature conditions on the parameters of the screw material and the plastic material, the change in axial force attenuation of the tightening fit of the plastic material and the screw material under such temperature changes can be obtained. Then, the change in axial force attenuation and the minimum torque are summed to obtain the target torque under the target working condition. This target torque can adapt to various temperature change application scenarios, ensuring the reliability of the tightening fit, without having to worry about the negative impact of temperature changes on the tightening fit.

[0063] It should be noted that the preset temperature conditions are application conditions that may be generated at certain temperatures. Each preset temperature condition will produce a temperature change range ΔT compared to the basic condition (the condition where the tightening fit is not affected by temperature). Based on different ΔT, the plastic material and screw material will undergo different changes, that is, the tightening fit will be affected differently.

[0064] As an optional embodiment, in order to save time, several extreme temperature conditions that have a significant impact on the parameters of screw material and plastic material can be selected from multiple different preset temperature conditions. The axial force attenuation change of screw material and plastic material under such extreme temperature conditions can be calculated. Based on this, the target torque can be determined. The target torque determined by the extreme temperature condition can be adapted to other arbitrary temperature conditions.

[0065] In some embodiments, the minimum torque required for the screw material to function normally under the target working condition can be determined by simulating the maximum impact force acting on the screw material under the target working condition, thereby ensuring the reliability of the screw material and the plastic material tightening fit; for example, step S102 may include:

[0066] Step 1.1) Determine the maximum impact force applied to the screw material under the target working condition by simulating a collision.

[0067] One approach is to simulate collision conditions through mechanical impact, which typically involves an impact with acceleration 'a'. The maximum impact force 'F' is then determined based on the different product weights 'm'. 冲击 As shown in the formula below:

[0068] F 冲击 =m·a

[0069] Step 1.2) Based on the maximum mechanical load corresponding to the maximum impact force, determine the axial force required by the screw material under the target working condition.

[0070] Among them, the maximum impact force F 冲击 With maximum mechanical load F 载荷 Equivalently, based on different structural designs, the number of screws n, and the surface friction coefficient μ between the screw and the connected parts, the axial force F required for a single screw can be calculated, as shown in the following formula:

[0071] F 载荷 =F·n·μ

[0072]

[0073] Step 1.3) Based on the axial force required under the target working condition, determine the minimum torque of the screw material under the target working condition.

[0074] It is understandable that in order to meet the application requirements of screw material under this target working condition, it is necessary to set the minimum torque of screw material; based on this minimum torque, it is determined whether the screw material is qualified.

[0075] In some embodiments, the tightening connection of self-tapping screws on plastic substrates differs significantly from that of machine screws of the same material. This is mainly because the plastic material is greatly affected by temperature, resulting in significant changes in its modulus and dimensions. This leads to a substantial reduction in the axial force between the threads, and the diameter of the plastic threaded hole also changes considerably. Therefore, when calculating the effect of temperature, it is necessary not only to calculate the dimensional changes of the clamped part, but also to consider the attenuation of the axial force of the thread and the attenuation of the axial force due to the hole diameter. As an example, step S104 considers the effects of temperature changes on the clamped part, the thread, and the hole diameter, respectively, to determine a more accurate axial force attenuation. The specific steps include:

[0076] Step 2.1) Based on the screw material parameters and plastic material parameters corresponding to each preset temperature condition, determine the first axial force attenuation of the clamped part and the thread used for tightening under the influence of temperature change.

[0077] It should be noted that the total axial force is provided by the force between the threads plus the force between the screw and the connected parts. After the screw is tightened, the total torque / axial force is provided by the thread and the screw contact surface, so they need to be calculated separately. Therefore, it is necessary to determine the proportion of the axial force provided by the thread and the screw in the total axial force to obtain the initial axial force attenuation of the clamped parts and the thread under the influence of temperature changes.

[0078] For example, a first proportion of the torque of the clamped part used for tightening the fit in the total torque and a second proportion of the thread torque in the total torque are determined respectively; specifically, this can be achieved through the following formula:

[0079] M A =M G +M K

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] Among them, M A It's the total torque, M. G It is the torque generated by the thread, M K It is the torque generated by the clamping surface, P is the thread pitch, μ G The thread friction coefficient, μ, can be obtained from mechanical design handbooks. K It is the coefficient of friction between the screw head and the clamped part, which can be obtained from mechanical design manuals; d2 is the thread pitch diameter; α is the thread flank angle; F M It is the total axial force, ω 螺纹 It is the proportion of the axial force generated by the thread in the total axial force (the second proportion), ω 夹紧 It is the proportion of the axial force generated by the clamping element in the total axial force (the first proportion), D Km It is the effective diameter at which the screw head contacts the clamped part.

[0086] Based on the aforementioned steps, and according to the state of the clamped part and the first proportion under each preset temperature condition, the first axial force attenuation of the clamped part used for tightening under the influence of temperature change is determined. This can be achieved through the following steps:

[0087] like Figure 2As shown, a clamping element is positioned between the self-tapping screw and the plastic substrate to allow for a tight fit between the screw and the plastic material. Due to differences in the stress points of the clamping element, it can be divided into multiple refined units based on the different stress conditions at each point. The axial force attenuation of the clamping element is then determined based on the state of each refined unit under each preset temperature condition, as shown in the following formula:

[0088]

[0089] Where, ΔF 夹紧 It is the change in axial force, l 夹紧 α is the total thickness of the clamped part, α is the coefficient of linear expansion, ΔT is the temperature range, E is the elastic modulus (at room temperature), and E' is the elastic modulus (after temperature change).

[0090] Next, multiply the axial force attenuation of the clamped part obtained from the aforementioned formula with the first proportion to obtain the first axial force attenuation of the clamped part under the influence of temperature change, as shown in the following formula:

[0091]

[0092] Where, ΔF 后夹紧 This can be understood as the change in axial force of the clamped part after a temperature change, that is, the amount of the first axial force attenuation of the clamped part under the influence of temperature change.

[0093] In addition to the aforementioned steps, the first axial force attenuation of the thread used for tightening is determined based on the thread state and second proportion under each preset temperature condition. Since plastic materials are sensitive to temperature changes, with key parameters being strength and modulus, after the self-tapping screw is driven in, it is assumed that the axial force received by the plastic thread is uniformly distributed across the thread. When the plastic thread is undriven, it can be approximated as a "ring-shaped simply supported beam," and this thread structure can be specifically described as follows: Figure 3 As shown.

[0094] For example, the axial force distribution surface of the thread can be equivalent to a simply supported annular beam model, and based on the simply supported annular beam model, the uniformly distributed load deflection Y of the thread can be determined as shown in the following formula:

[0095]

[0096] Since the entire thread remains elastic after the screw is tightened, before any plastic deformation occurs, it can be approximated as a spring. Therefore, based on the aforementioned formula, and according to the elastic coefficient and uniformly distributed load deflection under each preset temperature condition, the axial force attenuation F of the thread can be determined. 后 Specifically, this is achieved through the following formula:

[0097] F 前 =k 前 ·Y 前 F 后 =k 后 ·Y 后

[0098]

[0099]

[0100] The aforementioned parameters are the plastic material parameters before and after the temperature change, respectively. K is the elastic coefficient, E is the elastic modulus, and I is the moment of inertia.

[0101] Furthermore, based on the axial force attenuation F of the thread 后 Second proportion ω 螺纹 The product of these two factors yields the first axial force attenuation F of the thread under the influence of temperature changes. 后螺纹 As shown in the formula below:

[0102]

[0103] Step 2.2): Based on the hole diameter of the plastic material and the driving depth of the screw under each preset temperature condition, determine the amount of the second axial force attenuation of the plastic material and screw material under the combined influence of tightening fit and temperature change.

[0104] Specifically, when the hole diameter is less than three-quarters of the hole wall thickness, the hole diameter typically contracts with thermal expansion and contraction; otherwise, it expands and contracts with thermal expansion and contraction. This is because when a hole is heated, its wall thickness increases circumferentially, but simultaneously, the hole wall thickness also increases in all directions, causing the hole diameter to tend to shrink. When the hole diameter is greater than three-quarters of the hole wall thickness, i.e., the hole wall is thin, the increase in hole wall thickness is very small, and the hole will expand and contract with thermal expansion and contraction. When the hole wall thickness is very large, the increase in thickness in all directions is also large, and the hole will expand and contract with thermal expansion and contraction. The critical value for hole diameter variation needs to be determined based on the actual structural dimensions. Here, three-quarters is an example of a critical thickness value obtained through experiments to simulate the thermal changes in hole diameter, and is not a limitation.

[0105] For example, the enlargement or shrinkage of the hole is due to the thermal expansion and contraction of the material; therefore, the change in hole diameter can be equivalent to the linear expansion of the hole wall circumference. That is, by equating the change in hole diameter with the linear expansion of the hole wall circumference, the hole diameter of the plastic material under each preset temperature condition can be determined.

[0106] The change in perimeter dimension is determined by the formula for the coefficient of linear expansion, as shown in the following equation:

[0107]

[0108]

[0109] Where Δx is the change in perimeter, x is the perimeter of the plastic hole, α is the coefficient of linear expansion, Δt is the change in temperature, and Φ is the diameter of the hole.

[0110] Regarding the penetration depth, the screwing depth of a self-tapping screw also has a certain impact on its axial force and torque, while the screw length and the axial height of the plastic hole will change with temperature. Therefore, it is necessary to introduce the calculation of the influence of the penetration depth. Based on the absolute difference between the change in the axial height of the plastic and the change in the screw's z-axis length, the penetration depth of the screw under each preset temperature condition is determined.

[0111] Since the screw and the plastic hole change in the same direction due to elongation or shortening, according to the formula for the coefficient of linear expansion ΔX=X·α·ΔT, the formula for the change in the axial height of the plastic hole is ΔH. 塑胶 =H 塑胶 ·α 塑胶 ·ΔT, the formula for the change in screw length in the Z direction ΔH 螺钉 =H 螺钉 ·α 螺钉 • ΔT; Determine the final screw-in depth ΔH = |ΔH| 塑胶 -ΔH 螺钉 |

[0112] Based on the aforementioned embodiments, according to the preset parameter table, hole diameter, and penetration depth, the tightening torque T' of the plastic material and screw material under temperature changes is found. Based on the tightening torque, the second axial force attenuation F' of the plastic material and screw material under the combined influence of tightening fit and temperature change is determined, as shown in the following formula:

[0113]

[0114] Where T is torque, F is axial force, K is torque coefficient obtained from standard parts design manual, and D is nominal thread diameter.

[0115] Step 2.3) Based on the first axial force attenuation and the second axial force attenuation, determine the change in axial force attenuation of the tightening fit between the plastic material and the screw material under the influence of temperature change.

[0116] Here, based on the sum of the first and second axial force attenuations, the change in axial force attenuation under temperature variation in the tightening fit of the plastic material and the screw material is obtained, as shown in the following formula:

[0117] F 实际 =F 后夹紧 +F 后螺纹 -F'

[0118] In some embodiments, step S106 in the foregoing embodiments is based on the F 实际 The actual torque attenuation change value is determined, and then this actual torque attenuation change value is summed with the minimum torque to determine the target torque under the target operating condition.

[0119] By setting the target torque in the embodiments of the present invention, it is possible to determine the tightening fit of different materials that is not affected by temperature changes under the target working conditions. Such tightening fits can be more reliably applied in various vehicle production applications and other fields.

[0120] like Figure 4 As shown, this embodiment of the invention also provides a torque determining device 200 for tightening plastic and screw materials, the device comprising:

[0121] The first determining module 201 applies the maximum impact force corresponding to the target working condition to the screw material and determines the minimum torque of the screw material under the target working condition, wherein the screw material and the plastic material have been tightened together.

[0122] The second determining module 202 determines the change in axial force attenuation under temperature changes based on the screw material parameters and plastic material parameters under different preset temperature conditions.

[0123] The third determining module 203 determines the target torque for the tightening fit under the target working condition based on the minimum torque and the change in axial force attenuation.

[0124] In some embodiments, the second determining module 202 is further specifically configured to: determine, based on the screw material parameters and plastic material parameters corresponding to each preset temperature condition, the first axial force attenuation of the clamped part and the thread under the influence of temperature change; determine, based on the hole diameter of the plastic material and the driving depth of the screw under each preset temperature condition, the second axial force attenuation of the plastic material and the screw material under the combined influence of tightening and temperature change; and determine, based on the first axial force attenuation and the second axial force attenuation, the change in axial force attenuation of the tightening fit of the plastic material and the screw material under the influence of temperature change.

[0125] In some embodiments, the second determining module 202 is further specifically configured to: determine a first proportion of the torque of the clamped part used for tightening the fit in the total torque and a second proportion of the thread torque in the total torque; determine a first axial force attenuation of the clamped part used for tightening the fit under the influence of temperature change based on the clamped part state under each preset temperature condition and the first proportion; and determine a first axial force attenuation of the thread used for tightening the fit under the influence of temperature change based on the thread state under each preset temperature condition and the second proportion.

[0126] In some embodiments, the second determining module 202 is further specifically configured to: divide the clamped component into multiple refined units according to the different force conditions at each position point in the clamped component; determine the axial force attenuation of the clamped component according to the state of each refined unit under each preset temperature condition, wherein the clamped component is used to connect the screw material and the plastic material so that the screw material and the plastic material can be tightened together; and obtain the first axial force attenuation of the clamped component under the influence of temperature change by multiplying the axial force attenuation of the clamped component and the first proportion.

[0127] In some embodiments, the second determining module 202 is further specifically configured to: equate the axial force distribution surface of the thread to an annular simply supported beam model, and determine the uniformly distributed load deflection of the thread based on the annular simply supported beam model; determine the axial force attenuation of the thread according to the elastic coefficient and the uniformly distributed load deflection under each preset temperature condition; and obtain the first axial force attenuation of the thread under the influence of temperature change according to the product of the axial force attenuation of the thread and the second proportion.

[0128] In some embodiments, the second determining module 202 is further specifically configured to: determine the aperture of the plastic material under each preset temperature condition by equipping the change in aperture size with the linear expansion of the aperture wall circumference; determine the driving depth of the screw under each preset temperature condition based on the absolute difference between the change in the axial height of the plastic material and the change in the z-axis length of the screw; find the tightening torque of the plastic material and the screw material under temperature changes according to the preset parameter table, the aperture and the driving depth; and determine the second axial force attenuation of the plastic material and the screw material under the combined influence of tightening fit and temperature changes based on the tightening torque.

[0129] In some embodiments, the first determining module 201 is further specifically configured to: determine the maximum impact force applied to the screw material under the target working condition by simulating a collision; determine the axial force required by the screw material under the target working condition based on the maximum mechanical load corresponding to the maximum impact force; and determine the minimum torque of the screw material under the target working condition based on the axial force required under the target working condition.

[0130] Figure 5 This is a schematic diagram of the hardware architecture of the electronic device 300 provided in an embodiment of the present invention. See also... Figure 5 As shown, the electronic device 300 includes a machine-readable storage medium 301 and a processor 302, and may also include a non-volatile storage medium 303, a communication interface 304, and a bus 305; wherein the machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303, and the communication interface 304 communicate with each other through the bus 305. The processor 302 can execute the torque determination method for tightening plastic and screw materials described in the above embodiments by reading and executing machine-executable instructions in the machine-readable storage medium 301 for determining the torque for tightening plastic and screw materials.

[0131] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, etc. For example, machine-readable storage media can be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar storage media, or combinations thereof.

[0132] Non-volatile media can be non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar non-volatile storage media, or combinations thereof.

[0133] It is understood that the specific operation methods of each functional module in this embodiment can be referred to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0134] The computer-readable storage medium provided in the embodiments of the present invention stores a computer program. When the computer program code is executed, it can implement the torque determination method for tightening fit of plastic material and screw material as described in any of the above embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0136] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0137] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0138] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A torque determination method for plastic and screw material tightening cooperation, characterized in that, The method comprises: applying a maximum impact force corresponding to a target working condition to a screw material to determine a minimum torque of the screw material under the target working condition, wherein the screw material is in a tightened fit with a plastic material; based on screw material parameters and plastic material parameters under different preset temperature conditions, determining an axial force attenuation change amount of the tightened fit between the plastic material and the screw material under the influence of temperature changes; determining a target torque for the tightened fit under the target working condition according to the minimum torque and the axial force attenuation change amount.

2. The method of claim 1, wherein, The step of determining an axial force attenuation change amount of the tightened fit between the plastic material and the screw material under the influence of temperature changes based on screw material parameters and plastic material parameters under different preset temperature conditions, comprises: based on screw material parameters and plastic material parameters corresponding to each preset temperature condition, respectively determining a first axial force attenuation amount of a clamped part and a thread for tightened fit under the influence of temperature changes; determining a second axial force attenuation amount of the plastic material and the screw material under the combined influence of tightened fit and temperature changes according to the hole diameter of the plastic material and the tapping depth of the screw under each preset temperature condition; based on the first axial force attenuation amount and the second axial force attenuation amount, determining the axial force attenuation change amount of the tightened fit between the plastic material and the screw material under the influence of temperature changes.

3. The method of claim 1, wherein, The step of respectively determining a first axial force attenuation amount of a clamped part and a thread for tightened fit under the influence of temperature changes based on screw material parameters and plastic material parameters corresponding to each preset temperature condition, comprises: respectively determining a first proportion of a clamped part torque in a total torque and a second proportion of a thread torque in a total torque for tightened fit; determining a first axial force attenuation amount of a clamped part for tightened fit under the influence of temperature changes according to the clamped part state under each preset temperature condition and the first proportion; determining a first axial force attenuation amount of a thread for tightened fit under the influence of temperature changes according to the thread state under each preset temperature condition and the second proportion.

4. The method of claim 3, wherein, The step of determining a first axial force attenuation amount of a clamped part for tightened fit under the influence of temperature changes according to the clamped part state under each preset temperature condition and the first proportion, comprises: According to the different stress conditions of each position point in the clamped part, the clamped part is divided into a plurality of refined units; determining an axial force attenuation amount of the clamped part according to the state of each refined unit under each preset temperature condition, wherein the clamped part is used to connect the screw material and the plastic material so that the screw material and the plastic material are in a tightened fit; obtaining the first axial force attenuation amount of the clamped part under the influence of temperature changes according to the product of the axial force attenuation amount of the clamped part and the first proportion.

5. The method of claim 3, wherein, The step of determining a first axial force attenuation amount of a thread for tightened fit under the influence of temperature changes according to the thread state under each preset temperature condition and the second proportion, comprises: equivalent to a ring simply supported beam model, and based on the ring simply supported beam model, a uniform load deflection of the thread is determined; based on the elastic coefficient and the uniform load deflection under each preset temperature condition, an axial force attenuation of the thread is determined; a first axial force attenuation of the thread under the influence of temperature change is obtained according to the product of the axial force attenuation of the thread and the second proportion.

6. The method of claim 2, wherein, According to the hole diameter of the plastic material and the screw penetration depth under each preset temperature condition, the second axial force attenuation of the plastic material and the screw material under the combined influence of tightening fit and temperature change is determined, including: By equivalent of the change of hole size and the linear expansion of hole wall circumference, the hole diameter of the plastic material under each preset temperature condition is determined; Based on the absolute difference between the plastic axial height change and the screw z-axis length change, the penetration depth of the screw under each preset temperature condition is determined; According to the preset parameter table, the hole diameter and the penetration depth, the tightening torque of the plastic material and the screw material under temperature change is found out; Based on the tightening torque, the second axial force attenuation of the plastic material and the screw material under the combined influence of tightening fit and temperature change is determined.

7. The method of claim 1, wherein, The steps of applying the maximum impact force corresponding to the target working condition to the screw material to determine the minimum torque of the screw material under the target working condition, including: By simulating the collision, the maximum impact force applied to the screw material under the target working condition is determined; Based on the maximum mechanical load corresponding to the maximum impact force, the required axial force of the screw material under the target working condition is determined; Based on the required axial force under the target working condition, the minimum torque of the screw material under the target working condition is determined.

8. A torque determination device for plastic and screw material tightening cooperation, characterized in that, The device comprises: A first determination module applies the maximum impact force corresponding to the target working condition to the screw material to determine the minimum torque of the screw material under the target working condition, wherein the screw material and the plastic material have been tightened and fitted; A second determination module determines the axial force attenuation change of the tightening fit of the plastic material and the screw material under the influence of temperature change based on the screw material parameters and the plastic material parameters under different preset temperature conditions; A third determination module determines the target torque for the tightening fit under the target working condition according to the minimum torque and the axial force attenuation change.

9. An electronic device comprising a memory, a processor, the memory having stored therein a computer program executable on the processor, characterized in that, The processor executes the computer program to realize the steps of the method of any one of claims 1 to 7.

10. A machine-readable storage medium, characterized in that, The machine readable storage medium stores machine executable instructions, which when called and executed by the processor, cause the processor to realize the steps of the method of any one of claims 1 to 7.

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