Simulation method and device for residual stress of oil hole on transmission shaft, storage medium and equipment

Abstract

The application discloses a simulation method and device for oil hole residual stress on a transmission shaft, a storage medium and equipment, wherein the simulation method comprises the following steps: obtaining heat treatment conditions of a target transmission shaft; when there is a tool mark on the surface of the oil hole, an oil hole model with the tool mark is established, and the oil hole model with the tool mark is simplified according to the heat treatment conditions and carbon content distribution information of the target transmission shaft, so that an oil hole simulation simplified model is obtained; and the oil hole residual stress is simulated according to the heat treatment conditions and the oil hole simulation simplified model. The simulation method not only considers the influence of the tool mark on the residual stress, but also can quickly determine the oil hole residual stress, omit the cumbersome detection step, and does not need to damage the transmission shaft part, so that the weak link of the oil hole structure can be efficiently found, the design accuracy of the oil hole is improved, and meanwhile, the simulation method can be applied to strength and durability analysis and test of various types of structural parts, so that design and test problems can be avoided in advance, and rework is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of workpiece residual stress detection, and particularly relates to a simulation method and device for residual stress of an oil hole on a transmission shaft, a storage medium and equipment. BACKGROUND

[0002] With the development of economy, automobiles have gradually entered thousands of households, and the reliability of automobiles has been paid more and more attention. In the development process of automobile products, good lubrication is required for high reliability, so there are a large number of oil holes on the transmission shaft, and the residual stress of the oil hole can be quickly and accurately determined to facilitate the later test design and verification. The traditional residual stress detection method has many shortcomings, for example: ① the part needs to be destroyed for oil hole residual stress detection; ② high requirements for test equipment and personnel; ③ large dispersion of detection results; ④ time-consuming detection; ⑤ affecting strength and durability design, as there is no actual part at the initial design stage, the residual stress cannot be detected, which causes defects in test design and increases the number of tests. With the gradual improvement of computer software and hardware level, complex simulation becomes possible. Therefore, the residual stress of the oil hole on the transmission shaft can be simulated by relying on computer simulation technology to avoid the influence of residual stress at the initial design stage, which causes design defects and time-consuming and laborious post-detection, and increases the number of tests. SUMMARY

[0003] The present application aims to at least partially solve one of the problems in the related art.

[0004] To this end, one object of the present application is to propose a simulation method for residual stress of an oil hole on a transmission shaft, which not only considers the influence of machining tool marks on residual stress, but also quickly determines the residual stress of the oil hole, omits the tedious detection steps, does not destroy the transmission shaft parts, efficiently finds the weak link of the oil hole structure, timely feedback, improves the accuracy of oil hole design, simplifies the test equipment, reduces the time and cost investment; at the same time, the simulation method can be applied to strength and durability analysis and test of various types of structural parts, to avoid design and test problems in advance and avoid rework.

[0005] A second object of the present application is to propose a computer-readable storage medium.

[0006] A third object of the present application is to propose a test equipment.

[0007] A fourth object of the present application is to propose a simulation device for residual stress of an oil hole on a transmission shaft.

[0008] To achieve the above objects, the first aspect of the present application proposes a simulation method for residual stress of an oil hole on a transmission shaft, comprising:

[0009] obtaining the heat treatment condition of the target transmission shaft;

[0010] When the oil hole surface has a tool mark, an oil hole model with a tool mark is established, and the oil hole model with the tool mark is simplified according to heat treatment conditions and carbon content distribution information of the target transmission shaft, to obtain an oil hole simulation simplified model; and residual stress of the oil hole is simulated according to the heat treatment conditions and the oil hole simulation simplified model.

[0011] The simulation method of the residual stress of the oil hole on the transmission shaft in the above embodiment of the application not only considers the influence of the machining tool mark on the residual stress, and is more accurate in calculation, but also can quickly determine the residual stress of the oil hole, efficiently find weak links of the oil hole structure, timely feedback, improve the accuracy of the oil hole design, simplify the test equipment, and reduce the time and cost investment; meanwhile, the simulation method can be applied to strength and durability analysis and test of various types of structural parts, to avoid design and test problems in advance, and to avoid rework.

[0012] In addition, the simulation method according to the above embodiment of the application can have the following additional technical features:

[0013] According to the embodiment of the application, when the oil hole surface has no tool mark, the method further comprises: simplifying an oil hole model according to heat treatment conditions and carbon content distribution information of the target transmission shaft, to obtain the oil hole simulation simplified model.

[0014] According to the embodiment of the application, in the oil hole simulation simplified model, each carbon layer is respectively given a different thermal conductivity.

[0015] According to the embodiment of the application, the parameters of the oil hole simulation simplified model include material setting parameters and thermal boundary condition setting parameters.

[0016] According to the embodiment of the application, the simulation of the residual stress of the oil hole according to the heat treatment conditions and the oil hole simulation simplified model comprises: constructing a temperature field, a structure field and a stress field according to the heat treatment conditions and the oil hole simulation simplified model; and performing associated simulation according to the temperature field, the structure field and the stress field, to obtain the residual stress of the oil hole.

[0017] According to the embodiment of the application, when the residual stress of the oil hole is simulated, the temperature field, the structure field and the stress field are mutually coupled.

[0018] According to the embodiment of the application, after the residual stress of the oil hole is obtained, the method further comprises: performing static strength and reliability verification according to the residual stress of the oil hole, and determining a test target number according to the residual stress of the oil hole after the verification is passed.

[0019] In still another aspect of the present application, the present application provides a computer readable storage medium, according to an embodiment of the present application, the computer readable storage medium has a simulation program of residual stress of oil hole on transmission shaft stored thereon, and the simulation program of residual stress of oil hole on transmission shaft is executed by a processor to implement the simulation method of residual stress of oil hole on transmission shaft.

[0020] In a third aspect of the present application, the present application provides a test device, according to an embodiment of the present application, the test device comprises a memory, a processor and a simulation program of residual stress of oil hole on transmission shaft stored on the memory and executable on the processor, and the processor executes the simulation program of residual stress of oil hole on transmission shaft to implement the simulation method of residual stress of oil hole on transmission shaft.

[0021] In a fourth aspect of the present application, the present application provides a simulation device of residual stress of oil hole on transmission shaft, the device comprises:

[0022] The obtaining module is configured to obtain a heat treatment condition of a target transmission shaft.

[0023] The creating module is configured to, when there is a tool mark on the surface of the oil hole, establish an oil hole model with the tool mark, and simplify the oil hole model with the tool mark according to the heat treatment condition and the carbon content distribution information of the target transmission shaft to obtain an oil hole simulation simplified model.

[0024] The simulation module is configured to simulate residual stress of the oil hole according to the heat treatment condition and the oil hole simulation simplified model.

[0025] The simulation device according to the embodiment of the present application not only considers the influence of the processing tool mark on the residual stress, but also calculates more accurately, and can quickly determine the residual stress of the oil hole, efficiently find the weak link of the oil hole structure, timely feedback, improve the accuracy of the oil hole design, simplify the test device, and reduce the time and cost investment; at the same time, the simulation device can be applied to the strength and durability analysis and test of various types of structural parts, to avoid design and test problems in advance, and to avoid rework.

[0026] Additional aspects and advantages of the present application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a flow chart of a simulation method of residual stress of oil hole on transmission shaft according to an embodiment of the present application;

[0028] Figure 2 is a flow chart of a simulation method of residual stress of oil hole on transmission shaft according to another embodiment of the present application; is a flow chart of a simulation method of residual stress of oil hole on transmission shaft according to another embodiment of the present application;

[0029] Figure 3 is a heat treatment process of a target transmission shaft of an embodiment of the present application;

[0030] Figure 4 is an oil hole simulation simplified model of an embodiment of the present application;

[0031] Figure 5 is a thermal expansion coefficient variation curve of an oil hole from inside to outside a carbon layer;

[0032] Figure 6 is a thermal expansion coefficient variation curve of an oil hole from inside to outside a carbon layer;

[0033] Figure 7 is a thermal expansion coefficient variation curve of an oil hole from inside to outside a carbon layer;

[0034] Figure 8 is an elastic modulus value variation curve of an oil hole from inside to outside a carbon layer;

[0035] Figure 9 is an elastic modulus value variation curve of an oil hole from inside to outside a carbon layer;

[0036] Figure 10 is an elastic modulus value variation curve of an oil hole from inside to outside a carbon layer;

[0037] Figure 11 is an enthalpy value variation curve of an oil hole from inside to outside a carbon layer;

[0038] Figure 12 is an enthalpy value variation curve of an oil hole from inside to outside a carbon layer;

[0039] Figure 13 is an enthalpy value variation curve of an oil hole from inside to outside a carbon layer;

[0040] Figure 14 is a thermal conductivity variation curve of an oil hole;

[0041] Figure 15 is a thermal convection coefficient variation curve of an oil hole;

[0042] Figure 16 is a structure diagram of a simulation device of residual stress of an oil hole on a transmission shaft of an embodiment of the present application;

[0043] Explanation of reference signs:

[0044] The simulation device 10, the acquisition module 1, the creation module 2 and the simulation module 3. DETAILED DESCRIPTION

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] Figures 1-2 This is a flowchart of a simulation method for residual stress in oil holes on a transmission shaft according to an embodiment of the present invention.

[0048] like Figures 1-2 As shown, the simulation method for residual stress in the oil hole of the transmission shaft according to an embodiment of the present invention includes the following steps:

[0049] In step S101, the heat treatment conditions of the target transmission shaft are obtained.

[0050] In some embodiments of the present invention, reference is made to Figure 3 The heat treatment conditions for the target transmission shaft include, in sequence, the preheating zone process conditions, the heating zone process conditions, the pre-diffusion zone process conditions, the strong infiltration zone process conditions, the diffusion zone process conditions, the pre-cooling and quenching zone process conditions, and the air cooling zone process conditions.

[0051] In step S102, when there are tool marks on the surface of the oil hole, an oil hole model with tool marks is established, and the oil hole model with tool marks is simplified according to the heat treatment conditions and carbon content distribution information of the target transmission shaft to obtain a simplified oil hole simulation model.

[0052] Specifically, based on the heat treatment conditions of the target transmission shaft, the heat treatment process simulation is clarified and the machining status of the oil holes is obtained to confirm whether there are machining marks on the surface of the oil holes. If machining marks exist on the surface of the oil holes and the marks are located at stress concentration points, an oil hole model with machining marks is established. Then, based on the carbon content of the transmission shaft, the above-mentioned oil hole model with machining marks is layered (because different carbon contents result in different coefficients of thermal expansion, elastic modulus, and enthalpy values). Since the heat treatment process of the transmission shaft includes carburizing, a hardened layer of a certain depth will be formed on the surface of the transmission shaft. Different hardened layer depths correspond to different carbon contents. The carbon content data of different hardened layer depths are arranged in ascending order, and the corresponding data is divided into multiple sets of data with a fixed carbon content range, i.e., one carbon content range corresponds to one carbon layer. Finally, based on the heat treatment conditions and carbon content distribution information of the target transmission shaft obtained above, the oil hole model with machining marks is simplified to obtain a simplified oil hole simulation model (e.g., Figure 4 (As shown).

[0053] According to some embodiments of the present invention, if it is confirmed that there are no tool marks on the surface of the oil hole, the oil hole model is simplified according to the heat treatment conditions and carbon content distribution information of the target transmission shaft to obtain a simplified simulation model of the oil hole.

[0054] Further, in the oil hole simulation simplified model, each carbon layer is respectively given different thermal conductivities, and since the thermal conductivity, the convection coefficient and the enthalpy value vary with temperature, detailed variation curves need to be given to the oil hole model, for example, the parameters of the oil hole simulation simplified model include material setting parameters and thermal boundary condition setting parameters, wherein the material setting parameters include the thermal expansion coefficient, the elastic modulus, the enthalpy value and the conductivity, and the thermal boundary condition setting parameters include the thermal convection coefficient, in the finite element software, the thermal expansion coefficient and the elastic modulus variation curves (for example, as shown in FIG. 1, wherein a, b and c represent different carbon layers) corresponding to different carbon layers are respectively given to the carbon layers, the enthalpy value and the thermal conductivity (for example, as shown in FIG. 2, wherein a, b and c represent different carbon layers) varying with temperature are given to the material as part of the material setting parameters, and the thermal convection coefficient variation curve (for example, as shown in FIG. 3) is embodied as a thermal boundary in the transient analysis and the thermal-solid coupling analysis. Figures 5-10 Figures 11-14 Figure 15

[0055] In step S103, the oil hole residual stress is simulated according to the heat treatment condition and the oil hole simulation simplified model.

[0056] Specifically, the simulation of the oil hole residual stress according to the heat treatment condition and the oil hole simulation simplified model includes: constructing a temperature field, a structure field and a stress field according to the heat treatment condition and the oil hole simulation simplified model; then performing associated simulation according to the temperature field, the structure field and the stress field to obtain the oil hole residual stress, and the temperature field, the structure field and the stress field are mutually coupled when the simulated oil hole residual stress is obtained.

[0057] Further, after the thermal analysis coefficient is given to the model, transient thermal analysis is carried out according to the processing technology, the final temperature field is obtained by comprehensively considering the external environment and multiple transient thermal analyses, and then thermal-solid coupling analysis is performed to make the temperature field, the structure field and the stress field mutually coupled to obtain the residual stress.

[0058] According to some embodiments of the present application, after the oil hole residual stress is obtained, the method further includes: performing static strength and reliability verification according to the oil hole residual stress, and determining a test target number according to the oil hole residual stress after the verification is passed.

[0059] Specifically, after the transmission shaft oil hole residual stress is obtained through simulation analysis, whether the transmission shaft satisfies the static strength and reliability after considering the residual stress and whether the transmission shaft endurance test target is reasonable are confirmed according to the current material and process of the transmission shaft, to prevent the design and test from being reworked and unreasonable test specifications in the later stage. If it is found that the strength and reliability do not meet the requirements or the endurance test design is unreasonable after considering the residual stress, the design needs to be modified, and the transmission shaft oil hole residual stress is simulated again according to the modified design. Figure 1 ​​​The analysis process is calculated again. If the oil hole residual stress passes the static strength and reliability verification, the test target number is determined according to the oil hole residual stress.

[0060] The simulation method of the oil hole residual stress on the transmission shaft in the above-mentioned embodiments of the present application not only considers the influence of the machining tool marks on the residual stress, but also can quickly determine the oil hole residual stress, efficiently find the weak link of the oil hole structure, timely feedback, improve the accuracy of the oil hole design, simplify the test equipment, reduce the time and cost investment, and can be applied to the strength and durability analysis and test of various types of structural parts to avoid design and test problems in advance and avoid rework.

[0061] In addition, the embodiments of the present application also provide a computer readable storage medium having a simulation program of the oil hole residual stress on the transmission shaft stored thereon, and the simulation program of the oil hole residual stress on the transmission shaft is executed by a processor to realize the simulation method of the oil hole residual stress on the transmission shaft according to the above-mentioned embodiments.

[0062] The computer readable storage medium according to the embodiments of the present application realizes the simulation method of the oil hole residual stress on the transmission shaft according to the above-mentioned embodiments, not only considers the influence of the machining tool marks on the residual stress, but also can quickly determine the oil hole residual stress, omit the tedious detection steps, does not need to damage the transmission shaft part, efficiently finds the weak link of the oil hole structure, timely feedback, improves the accuracy of the oil hole design, simplifies the test equipment, reduces the time and cost investment, and can be applied to the strength and durability analysis and test of various types of structural parts to avoid design and test problems in advance and avoid rework.

[0063] In addition, the embodiments of the present application also provide a test equipment including a memory, a processor and a simulation program of the oil hole residual stress on the transmission shaft stored on the memory and executable on the processor, and the processor executes the simulation program of the oil hole residual stress on the transmission shaft to realize the simulation method of the oil hole residual stress on the transmission shaft according to the above-mentioned embodiments.

[0064] The test equipment according to the embodiments of the present application realizes the simulation method of the oil hole residual stress on the transmission shaft according to the above-mentioned embodiments, not only considers the influence of the machining tool marks on the residual stress, but also can quickly determine the oil hole residual stress, omit the tedious detection steps, does not need to damage the transmission shaft part, efficiently finds the weak link of the oil hole structure, timely feedback, improves the accuracy of the oil hole design, simplifies the test equipment, reduces the time and cost investment, and can be applied to the strength and durability analysis and test of various types of structural parts to avoid design and test problems in advance and avoid rework.

[0065] Figure 16A block schematic diagram of a simulation device for residual stress of an oil hole on a transmission shaft according to an embodiment of the present application.

[0066] The simulation device 10 comprises an obtaining module 1, a creating module 2 and a simulation module 3.

[0067] The obtaining module 1 is configured to obtain a heat treatment condition of a target transmission shaft; the creating module 2 is configured to, when there is a tool mark on the surface of the oil hole, establish an oil hole model with the tool mark, and simplify the oil hole model with the tool mark according to the heat treatment condition of the target transmission shaft and carbon content distribution information, to obtain an oil hole simulation simplified model; and the simulation module 3 is configured to simulate residual stress of the oil hole according to the heat treatment condition and the oil hole simulation simplified model.

[0068] The simulation device according to the embodiment of the present application not only considers the influence of the tool mark on the residual stress, and is more accurate in calculation, but also can quickly determine the residual stress of the oil hole, efficiently find the weak link of the oil hole structure, timely feedback, improve the accuracy of the oil hole design, simplify the test equipment, and reduce the time and cost investment; meanwhile, the simulation device can be applied to strength and durability analysis and test of various types of structural components, to avoid design and test problems in advance, and to avoid rework.

[0069] It should be noted that the specific implementation of the simulation device for residual stress of an oil hole on a transmission shaft according to the embodiment of the present application is similar to the specific implementation of the simulation method for residual stress of an oil hole on a transmission shaft according to the embodiment of the present application, and the specific implementation is described in the method part. In order to reduce redundancy, this part is not described here.

[0070] It is to be appreciated that the above description and the examples that follow are intended to be illustrative only and that changes can be made to the description and examples without departing from the scope of the application. Note also that the use of particular brand names in the description is solely for illustration and should not be construed as an endorsement of such brands.

[0071] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the embodiments described above, various steps or methods can be implemented, in part, or in whole, in software and / or firmware that are stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and in another embodiment, any of the following techniques, which are well known in the art, can be used to implement the application: a hybrid of the above techniques, discrete logic circuit(s) having logic gates for implementing logic functions upon request pins of the discrete logic circuit(s), programmable logic array(s) (PLAs), field programmable logic array(s) (FPGAs), etc.

[0072] In the description of the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The appearances of the above terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the described particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A method of simulating residual stresses in oil holes in a transmission shaft, characterized by, The method comprises: obtaining heat treatment conditions of a target transmission shaft; when there is a machining mark on the surface of the oil hole, an oil hole model with the machining mark is established, and the oil hole model with the machining mark is simplified according to the heat treatment conditions of the target transmission shaft and carbon content distribution information, to obtain an oil hole simulation simplified model; The method comprises if there is a machining mark on the surface of the oil hole and the machining mark is located at a stress concentration position, an oil hole model with the machining mark is established, then the oil hole model with the machining mark is layered according to the carbon content of the transmission shaft, the carbon content data of different depth hardened layers are arranged in order from small to large, and the corresponding data is divided into multiple groups of data with a fixed carbon content range width, that is, one carbon content range corresponds to one carbon layer, and finally the oil hole model with the machining mark is simplified according to the heat treatment conditions and the carbon content distribution information of the target transmission shaft obtained above, to obtain an oil hole simulation simplified model; According to the heat treatment conditions and the oil hole simulation simplified model, the oil hole residual stress is simulated, which comprises constructing a temperature field, a structure field and a stress field according to the heat treatment conditions and the oil hole simulation simplified model; and performing associated simulation according to the temperature field, the structure field and the stress field to obtain the oil hole residual stress. In the oil hole simulation simplified model, each carbon layer is respectively given a different thermal conductivity.

2. The method of claim 1, wherein, When there is no machining mark on the surface of the oil hole, the method further comprises: simplifying the oil hole model according to the heat treatment conditions of the target transmission shaft and the carbon content distribution information, to obtain the oil hole simulation simplified model.

3. The method of claim 1, wherein, The parameters of the oil hole simulation simplified model include material setting parameters and thermal boundary condition setting parameters.

4. The method of claim 1, wherein, When simulating the oil hole residual stress, the temperature field, the structure field and the stress field are mutually coupled.

5. The method of claim 1, wherein, After obtaining the oil hole residual stress, the method further comprises: performing static strength and reliability verification according to the oil hole residual stress, and determining a test target number according to the oil hole residual stress after the verification is passed.

6. A computer readable storage medium characterized by, A storage medium having stored thereon a simulation program of oil hole residual stress on a transmission shaft, which simulation program of oil hole residual stress on a transmission shaft, when executed by a processor, implements the simulation method of oil hole residual stress on a transmission shaft according to any one of claims 1-5.

7. A simulation apparatus of a gear shift shaft oil hole residual stress, characterized by, A storage medium having stored thereon a simulation program of oil hole residual stress on a transmission shaft, which simulation program of oil hole residual stress on a transmission shaft, when executed by a processor, implements the simulation method of oil hole residual stress on a transmission shaft according to any one of claims 1-5.

8. An apparatus for simulating residual stress of an oil hole in a transmission shaft, which implements the method for simulating residual stress of an oil hole in a transmission shaft according to any one of claims 1 to 5, characterized by, The method comprises: a obtaining module configured to obtain heat treatment conditions of a target transmission shaft; a creating module configured to, when there is a machining mark on the surface of the oil hole, establish an oil hole model with the machining mark, and simplify the oil hole model with the machining mark according to the heat treatment conditions of the target transmission shaft and carbon content distribution information, to obtain an oil hole simulation simplified model; a simulation module configured to simulate oil hole residual stress according to the heat treatment conditions and the oil hole simulation simplified model.

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