Gear tooth root stress detection method and related device
By drawing and converting the tooth shape of the variable pressure angle hob, drawing the relevant parameter values and tooth shape coefficients, and calculating the tooth root stress, the problem of low accuracy in the root stress detection of gears with variable pressure angle hob processing in the existing technology is solved, and more accurate gear quality calibration is achieved.
Patent Information
- Application Number
- CN202510118560.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2025-05-09
AI Technical Summary
The prior art lacks a root stress detection method suitable for gear processing with variable pressure angle hobs, resulting in low detection accuracy and affecting the verification of gear design and processing quality.
By drawing the normal tooth shape of the variable pressure angle hob and converting it into an envelope tooth shape, the parameter values related to the hob processing tooth root curve are illustrated based on the envelope tooth shape diagram, the tooth shape coefficient is determined, and the tooth root stress is then calculated.
Accurate root stress detection of gear processing gears with variable pressure angle hobs is achieved, error problems in the prior art are overcome, and the accuracy of gear quality calibration is improved.
Smart Images
Figure CN119962234A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the application field of mechanical transmission technology, and in particular to a gear tooth root stress detection method and related devices. Background Art
[0002] Gear hobbing has the advantages of high cutting efficiency and low cost, and is widely used in various gear processing.
[0003] Among them, the use of variable pressure angle hobs can solve the problems of too narrow tooth grooves or the inability to realize the design of the protruding part of the tooth top when machining large displacement gears. When using variable pressure angle hobs to machine gears, the meshing pitch circle position of the hob and the machined gear changes, which will cause the root stress of the gear to change during meshing operation. Therefore, it is necessary to detect the root stress of the gear machined by the variable pressure angle hob to check the gear quality during gear design or gear machining based on the variable pressure angle hob.
[0004] However, relevant standards such as the national standard only provide a method for determining the root stress of gears processed by equal pressure angle hobs. Using this method to directly substitute the variable pressure angle hob parameters to determine the root stress will cause a large error in the determination result, resulting in low accuracy in detecting the root stress of gears processed by variable pressure angle hobs, which in turn affects the accuracy of gear quality verification during gear design / processing based on variable pressure angle hobs. Summary of the invention
[0005] In view of this, the present application provides a gear tooth root stress detection method and related devices, which are used to overcome the limitations of existing gear calculation standards by proposing a tooth root stress engineering detection scheme suitable for gears processed by variable pressure angle hobs, so as to provide an effective means for checking the gear quality during the design / processing process of gears processed by variable pressure angle hobs.
[0006] The specific technical solutions are as follows:
[0007] A gear tooth root stress detection method, comprising:
[0008] Draw the normal tooth profile of the variable pressure angle hob;
[0009] Converting the normal tooth profile of the variable pressure angle hob into a corresponding enveloping tooth profile;
[0010] Based on the enveloping tooth profile, a parameter value of a first parameter related to a hob-machined tooth root curve is graphically solved;
[0011] Based on the parameter value of the first parameter, determining the parameter value of a second parameter related to the tooth shape;
[0012] Based on the parameter value of the second parameter, the tooth root stress of the gear machined by the variable pressure angle hob is determined, so as to perform quality check on the gear machined by the variable pressure angle hob based on the tooth root stress.
[0013] Optionally, drawing the normal tooth profile of the variable pressure angle hob includes:
[0014] The tool normal tooth profile of the variable pressure angle hob is drawn on a two-dimensional drawing software to obtain the normal tooth profile of the variable pressure angle hob.
[0015] Optionally, converting the normal tooth profile of the variable pressure angle hob into a corresponding envelope tooth profile comprises:
[0016] According to the meshing principle between the hob and the gear and the gear hobbing development principle, the normal tooth profile is subjected to translation and rotation transformation, and the corresponding envelope tooth profile is generated by copying the normal tooth profile after the translation and rotation transformation.
[0017] Optionally, the step of graphically calculating the parameter value of a first parameter related to a tooth root curve processed by a hob based on the enveloping tooth profile comprises:
[0018] Based on the definitions of the envelope tooth profile and the normal chord length of the dangerous section, the normal chord length value of the dangerous section of the variable pressure angle hob is graphically illustrated;
[0019] Based on the definitions of the envelope tooth profile and bending lever arm, the bending lever arm value of the variable pressure angle hob is graphically illustrated;
[0020] Wherein, the first parameter includes the normal chord length of the dangerous section and the bending lever arm.
[0021] Optionally, determining a parameter value of a second parameter related to the tooth shape based on the parameter value of the first parameter includes:
[0022] Determine the tooth form coefficient value based on the normal phase chord length value and the bending force arm value of the dangerous section;
[0023] Wherein, the second parameter includes a tooth form coefficient.
[0024] Optionally, determining the tooth root stress of a gear machined by a variable pressure angle hob based on the parameter value of the second parameter includes:
[0025] Based on the tooth form coefficient value, the tooth root stress of the gear machined by the variable pressure angle hob is determined using the calculation rule of the tooth root stress in the predetermined standard.
[0026] Optionally, the quality check of the gear machined by the variable pressure angle hob based on the tooth root stress includes at least one of the following:
[0027] Based on the tooth root stress, checking the gear strength of the gear machined by the variable pressure angle hob;
[0028] Based on the tooth root stress, the reliability of the gear machined by the variable pressure angle hob is checked.
[0029] A gear tooth root stress detection device, comprising:
[0030] Drawing module, used to draw the normal tooth profile of the variable pressure angle hob;
[0031] A conversion module, used for converting the normal tooth profile of the variable pressure angle hob into a corresponding envelope tooth profile;
[0032] A graphical module, for graphically analyzing a parameter value of a first parameter related to a tooth root curve machined by a hob based on the envelope tooth profile;
[0033] A first determination module, configured to determine a parameter value of a second parameter related to the tooth shape based on the parameter value of the first parameter;
[0034] The second determination module is used to determine the tooth root stress of the gear machined by the variable pressure angle hob based on the parameter value of the second parameter, so as to perform quality verification on the gear machined by the variable pressure angle hob based on the tooth root stress.
[0035] An electronic device, comprising:
[0036] Memory, used to store computer programs;
[0037] A processor is used to implement the gear tooth root stress detection method as described in any one of the above items by calling and executing the computer program in the memory.
[0038] A computer-readable medium stores a computer program, which, when executed by a processor, can be used to implement the gear tooth root stress detection method as described in any one of the above.
[0039] According to the above scheme, it can be known that the gear tooth root stress detection method and related devices provided in the present application draw the normal tooth profile of the variable pressure angle hob, and convert the normal tooth profile of the variable pressure angle hob into the corresponding envelope tooth profile, and then solve the parameter value of the first parameter related to the hob-processed tooth root curve based on the envelope tooth profile, and determine the parameter value of the second parameter related to the tooth profile based on the parameter value of the first parameter, and then further determine the tooth root stress of the gear processed by the variable pressure angle hob based on the parameter value of the second parameter. A tooth root stress engineering detection scheme suitable for gear processed by a variable pressure angle hob is proposed and implemented, which can overcome the limitations of the existing gear calculation standards and provide an effective means for checking the gear quality during the design / processing process of gear processed by a variable pressure angle hob. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0041] Figure 1 is a flow chart of the gear tooth root stress detection method provided by the present application;
[0042] Figure 2 It is a schematic diagram of the normal tooth shape provided by this application;
[0043] Figure 3 It is a schematic diagram of the envelope tooth shape provided by this application;
[0044] Figure 4 is a schematic diagram illustrating relevant parameters provided by the present application;
[0045] Figure 5 It is a schematic diagram of the definition of relevant parameters provided in this application;
[0046] Figure 6 It is a structural diagram of the gear tooth root stress detection device provided by the present application;
[0047] Figure 7 It is a structural diagram of the electronic device provided in this application. DETAILED DESCRIPTION
[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0049] Relevant standards such as the national standard only provide a method for determining the root stress of a gear processed by a constant pressure angle hob. Using this method to directly bring in the variable pressure angle hob parameters to determine the root stress will result in a large error in the determination result. To solve this problem, the present application embodiment provides a gear root stress detection method and related device. The method provided in the present application embodiment is specifically a tooth root stress engineering detection solution suitable for gears processed by a variable pressure angle hob.
[0050] See also Figure 1 As shown in the method flow chart, the gear tooth root stress detection method provided in the embodiment of the present application may at least include the following steps 101 to 105, and these steps are described in detail below.
[0051] Step 101: Draw the normal tooth profile of the variable pressure angle hob.
[0052] A variable pressure angle hob refers to a hob that has different pressure angles and modules between the tool and the gear being processed, and can process gears that meet the requirements by utilizing the basic principle of gear meshing with equal base pitches.
[0053] The application theory of variable pressure angle hobs is that the gear meshing must have the same base circle pitch, as shown in the following formula, where the same gear can be represented by different sets of modules and pressure angles:
[0054] m1cosα1=m2cosα2.
[0055] In this formula, mi represents the gear module, αi represents the gear pressure angle, and i=1 or 2.
[0056] For the application scenario of gear machining based on variable pressure angle hob, it is optional to draw the normal tooth profile of the variable pressure angle hob on a two-dimensional drawing software to obtain the normal tooth profile of the variable pressure angle hob, see Figure 2 , a schematic diagram of the normal tooth profile of the variable pressure angle hob is provided.
[0057] Step 102: converting the normal tooth profile of the variable pressure angle hob into a corresponding envelope tooth profile.
[0058] After obtaining the normal tooth profile of the variable pressure angle hob, the embodiment of the present application obtains the corresponding envelope tooth profile by translating, rotating, and copying the normal tooth profile of the variable pressure angle hob.
[0059] Specifically, according to the meshing principle between the hob and the gear and the hobbing development principle, the normal tooth profile of the variable pressure angle hob can be transformed by translation and rotation, and the corresponding envelope tooth profile can be generated by copying the normal tooth profile after translation and rotation transformation.
[0060] In practical applications, there are requirements for the translation distance / amplitude and rotation angle, which are specifically related to the number of envelopes, gear parameters, and processing parameters. Therefore, the actual translation distance / amplitude and rotation angle required for translation and rotation transformation of the normal tooth profile can be determined based on the number of envelopes, gear parameters, and processing parameters.
[0061] See also Figure 3 , in order to use the above method Figure 2 Schematic diagram of the envelope tooth profile converted from the normal tooth profile.
[0062] Step 103: Based on the envelope tooth profile, a parameter value of a first parameter related to a hob-machined tooth root curve is graphically calculated.
[0063] Optionally, the first parameter related to the tooth root curve processed by the hob includes the normal chord length and the bending force arm of the dangerous section of the variable pressure angle hob.
[0064] Relevant standards such as the national standard only provide a method for determining the root stress of a gear hobbed with a constant pressure angle. The root stress calculation of a gear requires the use of parameters such as the normal chord length of the dangerous section and the bending arm. GB / T3480 Method B provides the normal chord length S of the dangerous section of a hobbed gear with a constant pressure angle. Fn 、Bending force arm h Fe However, the applicant found that if these formulas are used to bring in the variable pressure angle hob parameters to calculate relevant parameters such as the S of the variable pressure angle hob Fn 、h Fe This will produce a large deviation, which will lead to inaccurate calculation results of the gear root stress.
[0065] To overcome this problem, the embodiment of the present application proposes the following technical ideas to avoid using the calculation formula provided by the above-mentioned standard: draw the normal tooth profile of the variable pressure angle hob, and according to the meshing principle of the hob and the gear and the gear hobbing development principle, convert the normal tooth profile of the variable pressure angle hob into an envelope tooth profile, and based on the envelope tooth profile, determine the parameter values of the first parameters such as the normal chord length of the dangerous section and the bending force arm related to the hob-processed tooth root curve by a graphical method (that is, without using the calculation formula provided in the relevant standard).
[0066] Among them, see Figure 4 The schematic diagram of the illustrated parameters can be specifically illustrated based on the definition of the envelope tooth shape and the normal chord length of the dangerous section, and the normal chord length of the variable pressure angle hob can be illustrated; similarly, the bending arm value of the variable pressure angle hob can be illustrated based on the definition of the envelope tooth shape and the bending arm. In addition, the 30° dangerous section curvature radius Pr can also be illustrated based on the envelope tooth shape to calculate the stress correction factor Ys involved later.
[0067] Step 104: Determine a parameter value of a second parameter related to the tooth shape based on the parameter value of the first parameter.
[0068] The second parameter related to the tooth shape includes the tooth shape coefficient.
[0069] After the values of the normal chord length of the dangerous section and the bending lever arm of the variable pressure angle hob are plotted, the tooth form coefficient can be determined based on the plotted values of the normal chord length of the dangerous section and the bending lever arm.
[0070] An exemplary calculation method of the tooth form factor YF is as follows:
[0071]
[0072] Among them, see Figure 5The schematic diagram of the relevant parameter definitions shown in the figure is as follows: Fn The length of the normal phase chord of the dangerous section of the variable pressure angle hob, h Fe represents the bending arm of the variable pressure angle hob, Mn is the normal modulus of the gear, α n represents the gear pressure angle, α Fen It represents the load action angle, which is related to the load direction at the external point of the single pair of teeth meshing area of the equivalent gear. ε It represents the load influence coefficient, which is related to the gear overlap.
[0073] Step 105: Determine the tooth root stress of the gear machined by the variable pressure angle hob based on the parameter value of the second parameter, so as to perform quality check on the gear machined by the variable pressure angle hob based on the tooth root stress.
[0074] On the basis of step 104, this step can specifically determine the tooth root stress of the gear processed by the variable pressure angle hob based on the tooth shape coefficient value and use the calculation rules of the tooth root stress in the predetermined standard to perform quality verification on the gear processed by the variable pressure angle hob based on the tooth root stress.
[0075] Optionally, the tooth root stress calculation formula in GB / T3480 method B can be used to calculate the tooth root stress of the gear machined by the variable pressure angle hob based on the tooth form coefficient value determined in the embodiment of the present application. F The calculation formula is as follows:
[0076] σ F =σ Fo K A K V K γ K Fα K Fβ ;
[0077]
[0078] In the above calculation formula, the meanings of each character are:
[0079] σ Fo : represents the basic basis for bending stress calculation, which is the maximum local principal stress generated at the tooth root of a pair of defect-free gears under static nominal torque loading and without any prestress (such as interference fit), that is, under the condition of stress ratio R = 0;
[0080] K A : It represents the service factor, which is the factor that increases the load by considering external influences such as changes in input and output torque;
[0081] K V : represents the dynamic load coefficient, which is the coefficient that increases the load by taking into account the internal dynamic effect;
[0082] K γ : represents the load-sharing coefficient, which is a coefficient that takes into account the uneven distribution of the total tangential load in the multi-path transmission gear train;
[0083] K Fα : Represents the inter-tooth load distribution coefficient for bending strength calculation. This coefficient takes into account the uneven load distribution along the circumferential direction caused by pitch deviation, etc.
[0084] K Fβ : represents the helix load distribution coefficient for bending strength calculation, which takes into account the uneven load distribution in the tooth width direction caused by helix errors caused by manufacturing errors, elastic deformation, etc.;
[0085] F t : represents the nominal end face tangential load on the pitch circle; it is worth noting that in all cases, the total tangential load is taken as F t ;
[0086] b: represents the tooth width. The b value of meshing gears is the tooth width at the root circle minus any intentional end chamfer or tooth end rounding. If the tooth widths of the large and small gears are not equal, it can be assumed that the load support width on the wider tooth width is equal to the smaller tooth width plus no more than 1 times the module on each side;
[0087] m n : represents the normal modulus;
[0088] Y F : represents the tooth profile coefficient, also known as the tooth shape coefficient;
[0089] Y S : represents the stress correction coefficient;
[0090] Y β : represents the helix angle coefficient, which is used to compensate for the fact that the bending moment strength at the root of the helical gear due to the inclination of the contact line is smaller than the corresponding value of the equivalent spur gear used as the calculation basis;
[0091] Y B : represents the rim thickness coefficient, which is the correction coefficient for adjusting the calculated bending stress value of thin rim gears;
[0092] Y DT : Represents the tooth height coefficient, which is a correction coefficient used to adjust the calculated value of high-precision gear bending stress within the specified range of overlap.
[0093] Among the above coefficients, Y F and Y s Other coefficients except are not related to variable pressure angle tools and can be calculated through the corresponding gear parameters.
[0094] According to the above scheme, it can be known that the gear tooth root stress detection method provided by the present application draws the normal tooth profile of the variable pressure angle hob, and converts the normal tooth profile of the variable pressure angle hob into the corresponding envelope tooth profile, and then solves the parameter value of the first parameter related to the hob-processed tooth root curve based on the envelope tooth profile, and determines the parameter value of the second parameter related to the tooth profile based on the parameter value of the first parameter, and then further determines the tooth root stress of the gear processed by the variable pressure angle hob based on the parameter value of the second parameter. A tooth root stress engineering detection scheme suitable for gear processed by a variable pressure angle hob is proposed and implemented, which can overcome the limitations of the existing gear calculation standards and provide an effective means for checking the gear quality during the design / processing process of gear processed by a variable pressure angle hob.
[0095] In an optional embodiment, the gear tooth root stress detection method provided by the present application may further include the following processing after step 105:
[0096] The quality of the gear machined by the variable pressure angle hob is checked based on the tooth root stress.
[0097] Among them, the quality verification of this embodiment may include but is not limited to verifying the gear strength of the gear processed by the variable pressure angle hob based on the tooth root stress determined in the previous text during gear design or gear processing based on the variable pressure angle hob, and / or verifying the reliability of the gear processed by the variable pressure angle hob.
[0098] Relevant standards such as the national standard only provide a method for calculating the root stress of gears processed by a constant pressure angle hob. Using this method to directly substitute the variable pressure angle hob parameters to calculate the root stress will cause a large error in the calculation result. However, using the method provided in the embodiment of the present application, a more realistic and accurate root stress can be obtained, which is beneficial for overcoming the limitations of existing gear calculation standards, and provides an effective means for gear quality verification in the early stages of gear design or gear processing, which is beneficial for improving the quality of gears.
[0099] Corresponding to the above method, the present application embodiment also provides a gear tooth root stress detection device, see Figure 6 The schematic diagram of the composition structure of the device comprises:
[0100] A drawing module 601 is used to draw the normal tooth profile of the variable pressure angle hob;
[0101] A conversion module 602, used to convert the normal tooth profile of the variable pressure angle hob into a corresponding envelope tooth profile;
[0102] A graphical module 603, for graphically analyzing a parameter value of a first parameter related to a tooth root curve processed by a hob based on the envelope tooth profile;
[0103] A first determination module 604, configured to determine a parameter value of a second parameter related to the tooth shape based on the parameter value of the first parameter;
[0104] The second determination module 605 is used to determine the tooth root stress of the gear machined by the variable pressure angle hob based on the parameter value of the second parameter, so as to perform quality verification on the gear machined by the variable pressure angle hob based on the tooth root stress.
[0105] In an optional implementation, the drawing module 601 is specifically used to draw the tool normal tooth profile of the variable pressure angle hob in a two-dimensional drawing software to obtain the normal tooth profile of the variable pressure angle hob.
[0106] In an optional embodiment, the conversion module 602 is specifically used to: perform translation and rotation transformation on the normal tooth profile according to the meshing principle between the hob and the gear and the gear hobbing development principle, and generate the corresponding envelope tooth profile by copying the normal tooth profile after the translation and rotation transformation.
[0107] In an optional implementation, the diagram module 603 is specifically configured to:
[0108] Based on the definitions of the envelope tooth profile and the normal chord length of the dangerous section, the normal chord length value of the dangerous section of the variable pressure angle hob is graphically illustrated;
[0109] Based on the definitions of the envelope tooth profile and bending lever arm, the bending lever arm value of the variable pressure angle hob is graphically illustrated;
[0110] Wherein, the first parameter includes the normal chord length of the dangerous section and the bending lever arm.
[0111] In an optional implementation manner, the first determining module 604 is specifically configured to:
[0112] Determine the tooth form coefficient value based on the normal phase chord length value and the bending force arm value of the dangerous section;
[0113] Wherein, the second parameter includes a tooth form coefficient.
[0114] In an optional implementation manner, the second determination module 605 is specifically used to determine the tooth root stress of the gear machined by the variable pressure angle hob based on the tooth form coefficient value and using the calculation rule of the tooth root stress in the predetermined standard.
[0115] In an optional embodiment, the above device further includes a quality verification module, which is used to perform at least one of the following:
[0116] Based on the tooth root stress, checking the gear strength of the gear machined by the variable pressure angle hob;
[0117] Based on the tooth root stress, the reliability of the gear machined by the variable pressure angle hob is checked.
[0118] With regard to the gear tooth root stress detection device disclosed in the embodiment of the present application, since it corresponds to the gear tooth root stress detection method disclosed in the above method embodiment, the description is relatively simple. For relevant similarities, please refer to the description of the above method embodiments, which will not be described in detail here.
[0119] The present application also discloses an electronic device, the composition structure of the electronic device, such as Figure 7 As shown, including at least:
[0120] The memory 10 is used to store computer programs.
[0121] The processor 20 is used to implement the gear tooth root stress detection method provided by any of the above method embodiments by calling and executing the computer program in the memory.
[0122] The processor 20 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a neural network processor (NPU), a deep learning processor (DPU) or other programmable logic devices, etc.
[0123] In addition, the electronic device may also include components such as a communication interface and a communication bus. The memory, the processor and the communication interface communicate with each other through the communication bus.
[0124] The communication interface is used for communication between electronic devices and other devices. The communication bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc.
[0125] In addition, the present application also provides a computer-readable medium having a computer program stored thereon, wherein the computer program includes program code for executing the gear tooth root stress detection method disclosed in any of the method embodiments above, and when executed by a processor, can be used to implement the gear tooth root stress detection method disclosed in any of the method embodiments above.
[0126] In the context of the present application, a computer readable medium (machine readable medium) may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. A more specific example of a machine readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0127] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0128] For the convenience of description, the above system or device is described by dividing it into various modules or units according to its functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.
[0129] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly contributed to the prior art in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.
[0130] Finally, it should be noted that, in this article, relational terms such as first, second, third and target are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0131] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A gear tooth root stress detection method, characterized in that: include: Draw the normal tooth profile of the variable pressure angle hob; Converting the normal tooth profile of the variable pressure angle hob into a corresponding enveloping tooth profile; Based on the enveloping tooth profile, a parameter value of a first parameter related to a hob-machined tooth root curve is graphically solved; Based on the parameter value of the first parameter, determining the parameter value of a second parameter related to the tooth shape; Based on the parameter value of the second parameter, the tooth root stress of the gear machined by the variable pressure angle hob is determined, so as to perform quality check on the gear machined by the variable pressure angle hob based on the tooth root stress.
2. The gear tooth root stress detection method according to claim 1, characterized in that: The method of drawing the normal tooth profile of the variable pressure angle hob comprises: The tool normal tooth profile of the variable pressure angle hob is drawn on a two-dimensional drawing software to obtain the normal tooth profile of the variable pressure angle hob.
3. The gear tooth root stress detection method according to claim 1, characterized in that: The step of converting the normal tooth profile of the variable pressure angle hob into a corresponding envelope tooth profile comprises: According to the meshing principle between the hob and the gear and the gear hobbing development principle, the normal tooth profile is subjected to translation and rotation transformation, and the corresponding envelope tooth profile is generated by copying the normal tooth profile after the translation and rotation transformation.
4. The gear tooth root stress detection method according to claim 1, characterized in that: The method of graphically analyzing the parameter value of the first parameter related to the hob-machined tooth root curve based on the envelope tooth profile includes: Based on the definitions of the envelope tooth profile and the normal chord length of the dangerous section, the normal chord length value of the dangerous section of the variable pressure angle hob is graphically illustrated; Based on the definitions of the envelope tooth profile and bending lever arm, the bending lever arm value of the variable pressure angle hob is graphically illustrated; Wherein, the first parameter includes the normal chord length of the dangerous section and the bending lever arm.
5. The gear tooth root stress detection method according to claim 4, characterized in that: The step of determining a parameter value of a second parameter related to the tooth shape based on the parameter value of the first parameter comprises: Determine the tooth form coefficient value based on the normal phase chord length value and the bending force arm value of the dangerous section; Wherein, the second parameter includes a tooth form coefficient.
6. The gear tooth root stress detection method according to claim 5, characterized in that: The step of determining the tooth root stress of a gear machined by a variable pressure angle hob based on the parameter value of the second parameter comprises: Based on the tooth form coefficient value, the tooth root stress of the gear machined by the variable pressure angle hob is determined using the calculation rule of the tooth root stress in the predetermined standard.
7. The gear tooth root stress detection method according to claim 1, characterized in that: The quality check of the gear machined by the variable pressure angle hob based on the tooth root stress includes at least one of the following: Based on the tooth root stress, checking the gear strength of the gear machined by the variable pressure angle hob; Based on the tooth root stress, the reliability of the gear machined by the variable pressure angle hob is checked.
8. A gear tooth root stress detection device, characterized in that: include: Drawing module, used to draw the normal tooth profile of the variable pressure angle hob; A conversion module, used to convert the normal tooth profile of the variable pressure angle hob into a corresponding envelope tooth profile; A graphical module, for graphically analyzing a parameter value of a first parameter related to a tooth root curve machined by a hob based on the envelope tooth profile; A first determination module, configured to determine a parameter value of a second parameter related to the tooth shape based on the parameter value of the first parameter; The second determination module is used to determine the tooth root stress of the gear machined by the variable pressure angle hob based on the parameter value of the second parameter, so as to perform quality verification on the gear machined by the variable pressure angle hob based on the tooth root stress.
9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to implement the gear tooth root stress detection method as described in any one of claims 1 to 7 by calling and executing the computer program in the memory.
10. A computer readable medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it can be used to implement the gear tooth root stress detection method as described in any one of claims 1-7.