Gear contact performance data processing method and system based on three-line fusion

Abstract

The invention discloses a gear contact performance data processing method and system based on three-line fusion. The method comprises the following steps: S1, obtaining a theoretical model calculation result and an experimental measurement result of a gear entity; and S2, performing three-line fusion according to a theoretical model calculation result, an experimental measurement result of the gear entity and a measurement model calculation result of the gear entity to obtain a gear meshing contact performance measurement result. By adopting the technical scheme provided by the invention, the readability and engineering availability of gear contact performance experimental data are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gear transmission, and in particular relates to a gear contact performance data processing method and system based on three-line fusion. Background Art

[0002] The contact performance data obtained from gear transmission measurement is difficult to completely correspond to the theoretical calculation results, which may appear in advance or lag on the time axis (time frequency), or in large errors in the size of performance evaluation data. The former can be called different frequencies, and the latter is manifested as different radiations. Figure 1 The calculation results and experimental measurement results of the contact temperature of the tooth surface of a certain gear pair given in the paper reflect this problem of different radiation and frequency. This phenomenon makes the readability of the measured data poor and the reflection of the actual engineering problems is not intuitive enough, thus affecting the design and measurement of high-precision gears and restricting the development and improvement of quantitative measurement methods for gear transmission.

[0003] The reason for this is that the theoretical calculation results are generally calculated based on theoretical models. These theoretical models, whether they are solved based on mathematical equations or constructed using simulation software, generally do not include gear tooth differences and errors, and therefore cannot reflect the specific conditions of the gear entity being measured. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a gear contact performance data processing method and system based on three-line fusion.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A gear contact performance data processing method based on three-line fusion, comprising:

[0007] Step S1, obtaining theoretical model calculation results and experimental measurement results of the gear entity;

[0008] Step S2: performing three-line fusion according to the calculation result of the theoretical model, the experimental measurement result of the gear entity and the calculation result of the measurement model of the gear entity to obtain the measurement result of the gear meshing contact performance.

[0009] Preferably, the measurement model of the gear entity is obtained by scanning the gear under test with a high-precision scanning device before and after each gear entity measurement experiment, respectively acquiring its contour point cloud, and constructing it from the contour point cloud.

[0010] Preferably, the gear errors of the measurement model include: tooth surface error, tooth profile error, surface error and pitch deviation in the gear entity.

[0011] Preferably, a calculation result for the measurement model is obtained according to the meshing position in the measurement model, and the calculation result is the tooth surface flash temperature generated when different positions on the tooth surface mesh.

[0012] The present invention also provides a gear contact performance data processing system based on three-line fusion, comprising:

[0013] An acquisition device, used to acquire theoretical model calculation results and experimental measurement results of the gear entity;

[0014] The fusion device is used to perform three-line fusion according to the calculation results of the theoretical model, the experimental measurement results of the gear entity and the calculation results of the measurement model of the gear entity, so as to obtain the data analysis results of the gear meshing contact performance.

[0015] Preferably, the measurement model of the gear entity is obtained by scanning the gear under test with a high-precision scanning device before and after each gear entity measurement experiment, respectively acquiring its contour point cloud, and constructing it from the contour point cloud.

[0016] Preferably, the gear errors of the measurement model include: tooth surface error, tooth profile error, surface error and pitch deviation in the gear entity.

[0017] Preferably, a calculation result for the measurement model is obtained according to the meshing position in the measurement model, and the calculation result is the tooth surface flash temperature generated when different positions on the tooth surface mesh.

[0018] The present invention uses "three-line fusion" data processing of theoretical model calculation results, measurement model calculation results and experimental measurement results of gear entities to provide a solution for the interpretation and application of gear contact performance experimental measurement results, thereby improving the quantitative level of gear transmission contact performance measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 This is an example of the comparison between the theoretical calculated value and the experimental value of the contact temperature of the tooth surface of a spur gear pair;

[0021] Figure 2 It is a flow chart of the gear contact performance data processing method based on three-line fusion;

[0022] Figure 3 This is an example of a spur bevel gear pair meshing;

[0023] Figure 4 This is an example of a measurement model for a spur bevel gear pair;

[0024] Figure 5 This is an example of the theoretical calculation model for a spur bevel gear pair;

[0025] Figure 6 This is an example of the calculation results of the tooth surface flash temperature under the theoretical calculation model of the spur bevel gear pair;

[0026] Figure 7 This is an example of the calculation results of the tooth surface flash temperature under the measurement model of the spur bevel gear pair;

[0027] Figure 8 This is an example of the experimental measurement results of the flash temperature on the tooth surface of a spur bevel gear pair;

[0028] Fig. 9 This is an example of the comparison results of tooth surface flash temperature under the "three-line fusion" of a spur bevel gear pair. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment 1:

[0032] like Figure 2 As shown, an embodiment of the present invention provides a gear contact performance data processing method based on three-line fusion, comprising:

[0033] Step S1, obtaining theoretical model calculation results and experimental measurement results of the gear entity;

[0034] Step S2: performing three-line fusion according to the calculation results of the theoretical model, the experimental measurement results of the gear entity and the calculation results of the measurement model of the gear entity to obtain the data analysis results of the gear meshing contact performance.

[0035] Based on the calculation results of the theoretical model and the experimental measurement results of the gear entity, a measurement model for the gear entity is introduced. This model uses a high-precision scanning device to scan the measured gear before and after each gear entity measurement experiment to obtain its contour point cloud, and the model is constructed from the contour point cloud.

[0036] The gear entity refers to the actual gear obtained by machining. Figure 3 A physical example of a pair of spur bevel gears is given. The gear entity contains various processing errors and assembly errors. These errors will affect the contact performance and transmission performance of the gear pair. However, the surface features of the actual physical entity of the gear entity cannot be directly extracted and applied to calculations. Its performance can only be measured with the help of certain experimental means. The data obtained at this time is called the experimental measurement results of the gear entity.

[0037] If the coordinates of each point on the gear entity can be extracted, these coordinate values ​​are called the measurement point cloud of the gear entity, or point cloud for short. The measurement model corresponding to the gear entity can be constructed from the point cloud. The density and accuracy of the point cloud determine the accuracy of the measurement model. The gear errors of the measurement model include: tooth surface error, tooth profile error, surface error and pitch deviation in the gear entity. It is the closest quantitative representation of the gear entity. Figure 3 The measurement model of the spur bevel gear pair shown in Figure 4 shown.

[0038] When calculating and analyzing gear performance, a theoretical model is generally used. The theoretical model can be constructed based on the gear processing method to construct its tooth profile equation and the meshing principle to construct its meshing equation. Solving the tooth profile equation can obtain the tooth profile theoretical point cloud, and based on the point cloud, the theoretical model of the gear can be obtained; solving the meshing equation can obtain the theoretical model of the gear pair. Another theoretical model can be generated based on gear parameters in finite element software. Theoretical models obtained in different ways are all used for theoretical calculations. Figure 3 and Figure 4 The theoretical model of the spur bevel gear pair is shown in Figure 5 shown.

[0039] According to the theoretical model, combined with the corresponding theoretical calculation method or finite element analysis method, the contact performance of the gear pair is analyzed and calculated. The contact performance here includes but is not limited to the gear pair tooth surface contact temperature, tooth surface flash temperature, lubrication and friction, contact trace, contact spot, etc. Figure 5 Taking the theoretical model of the spur bevel gear pair shown in the figure as an example, the theoretical calculation results of the flash temperature on the tooth surface are as follows: Figure 6 As shown, it can be called curve 1. The calculation result reflects the tooth surface flash temperature generated when different points on the tooth surface are meshing. The tooth surface flash temperature is a very sensitive transient quantity of gear meshing. The correctness and accuracy of the calculation result can only be more suitable for guiding the design and performance control of the meshing process after experimental verification.

[0040] By using the meshing position in the measurement model and the theoretical calculation method, the calculation results for the measurement model can be obtained. Figure 4Taking the straight bevel gear pair measurement model shown in the figure as an example, the calculation results of the tooth surface flash temperature are as follows Figure 7 As shown, it can be called curve 2. The calculation result also reflects the tooth surface flash temperature generated when different positions on the tooth surface are meshed, but the difference is that the meshing position comes from the measurement model.

[0041] By adopting a reasonable and effective measurement method, the experimental measurement value of the gear surface flash temperature can be obtained, such as Figure 8 As shown, it can be called curve 3. Only when the time of the experimental measurement result corresponds to the specific position on the gear can it better illustrate the corresponding relationship between the tooth surface flash temperature and the tooth surface.

[0042] The result of the theoretical model calculation is called curve 1. Figure 7 The experimental measurement result of the gear entity is called curve 3, and the calculation result of the measurement model of the gear entity is called curve 2. The specific steps of three-line fusion are: S21, draw curve 1 and curve 2 on the same time axis to study and analyze the influence of static error on the calculation results; S22, draw curve 2 and curve 3 on the same time axis to study and analyze the influence of dynamic error on the calculation and experimental measurement results; S23, draw curve 1 and curve 3 on the same time axis to study and analyze the influence of static and dynamic errors; S24, draw curve 1, curve 2 and curve 3 on the same time axis, and the result is the "three-line fusion" result, such as Fig. 9 The asynchrony of the three curves on the time axis (horizontally) reflects errors such as tooth profile error, tooth pitch deviation, and wear; the different amplitudes at corresponding moments are due to the insufficient calculation accuracy caused by the influence mechanism of the rotational speed in the calculation. Fig. 9 The three curves in the middle reflect the changes in the meshing position on the time axis (here the horizontal axis), which can explain Figure 1 The reason for the different frequencies in the figure is that the error is not considered in the calculation results of the theoretical model; the three curves reflect the influence of the error on the contact performance in terms of amplitude (here is the vertical axis), which can reveal Figure 1 The reason why the two curves have different radii is that the parameters in the calculation or measurement of different meshing positions have changed, and naturally different results are obtained. The "three-line fusion" method can prove the accuracy of the calculation and the correctness of the calculation method.

[0043] Curve 1 and Curve 2, which are obtained by theoretical calculation based on the theoretical model and the measurement model, have the same amplitude, which reflects the accuracy of the calculation method; Curve 3, the temperature value measured for the gear entity, has the same frequency as Curve 2, which reflects the accuracy of the measurement model in characterizing the gear entity. Curve 1 and Curve 2 have different frequencies because the gear error is not considered when calculating Curve 1, which is the necessity of building a measurement model; Curve 2 and Curve 3 have different amplitudes, which must be due to deviations in the calculation method or errors in the measurement. The theoretical calculation method should be corrected or the measurement accuracy should be improved (identification of measurement errors). It can be seen that the intuitive and reliable "three-line fusion" standard is the basis for accurately interpreting the contact performance measurement results.

[0044] The key to three-line fusion is the registration of the measurement model and the gear entity. Due to the errors in gear processing, each gear tooth of the gear entity is actually different, that is, there are gear tooth differences. The measurement model is constructed using the point cloud scanned from the gear entity. The measurement model should match the starting point of the actual calculation with the starting point of the gear entity measurement experimental data acquisition based on the correspondence between the scanned point cloud and the gear entity, in order to ensure that the results calculated for the measurement model and the experimental measurement data are in the same frequency on the time axis.

[0045] The errors in gear processing are divided into long-period errors and short-period errors. The so-called long-period error refers to the error that occurs once in one rotation of the gear, also known as low-frequency error; while the short-period error refers to the error that occurs once on one gear tooth, also known as high-frequency error. These errors cause the calculation results of the theoretical model to appear ahead of or behind the calculation results of the measurement model and the experimental measurement data on the time axis. When using the three-line fusion method to process this type of contact performance data, the influence of long-period errors and short-period errors should be distinguished. When distinguishing the influence caused by long-period errors, the period when the teeth on the driving wheel and the driven wheel mesh once (also known as tooth meshing) can be used as a period for comparison and observation. If the three curves can correspond again within this time range, it further reflects the influence of long-period errors in the gear manufacturing process. This is also the inevitable result after considering the difference in teeth when studying the meshing characteristics of gears.

[0046] In order to solve the problem of different frequencies and amplitudes in the time domain between the calculation results of the gear meshing contact performance based on the theoretical model and the measurement results for the gear entity, the embodiment of the present invention introduces a three-line fusion solution for the calculation results of the measurement model. The calculation results of the measurement model are close to the measurement results in the time domain, and close to the calculation results based on the theoretical model in amplitude. The basic principle is that the gear tooth processing error is taken into account in the measurement model, and the meshing time (time-frequency) is closer to the position of the gear entity; the calculation results are closer to the calculation results based on the theoretical model. Furthermore, the fusion of the three-line results can be observed or compared in different periods to understand the manufacturing errors and friction and wear of the gears. This method can effectively improve the readability and engineering usability of experimental data on gear contact performance.

[0047] Embodiment 2:

[0048] The embodiment of the present invention also provides a gear contact performance data processing system based on three-line fusion, comprising: an acquisition device for acquiring theoretical model calculation results and experimental measurement results of gear entities;

[0049] The fusion device is used to perform three-line fusion according to the calculation results of the theoretical model, the experimental measurement results of the gear entity and the calculation results of the measurement model of the gear entity to obtain the measurement results of the gear meshing contact performance.

[0050] As an implementation method of an embodiment of the present invention, the measurement model of the gear entity is obtained by scanning the measured gear with a high-precision scanning device before and after each gear entity measurement experiment, and obtaining its contour point cloud respectively, and then constructing it from the contour point cloud.

[0051] As an implementation of an embodiment of the present invention, the gear error of the measurement model includes: tooth surface error, tooth profile error, surface error and pitch deviation in the gear entity.

[0052] As an implementation of an embodiment of the present invention, a calculation result for the measurement model is obtained according to the meshing position in the measurement model, and the calculation result is the tooth surface flash temperature generated when different positions on the tooth surface mesh.

[0053] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A gear contact performance data processing method based on three-line fusion, characterized in that: include: Step S1, obtaining theoretical model calculation results and experimental measurement results of the gear entity; Step S2: performing three-line fusion according to the calculation results of the theoretical model, the experimental measurement results of the gear entity and the calculation results of the measurement model of the gear entity to obtain the data analysis results of the gear meshing contact performance.

2. The gear contact performance data processing method based on three-line fusion according to claim 1 is characterized in that: The measurement model of the gear entity is obtained by scanning the measured gear with high-precision scanning equipment before and after each gear entity measurement experiment, and obtaining its contour point cloud respectively, which is constructed from the contour point cloud.

3. The gear contact performance data processing method based on three-line fusion according to claim 2 is characterized in that: The gear errors of the measured model include: tooth surface error, tooth profile error, surface error and pitch deviation in the gear entity.

4. The gear contact performance data processing method based on three-line fusion according to claim 3 is characterized in that: According to the meshing position in the measurement model, a calculation result for the measurement model is obtained, wherein the calculation result is the tooth surface flash temperature generated when different positions on the tooth surface are meshed.

5. A gear contact performance data processing system based on three-line fusion, characterized in that: include: An acquisition device, used to acquire theoretical model calculation results and experimental measurement results of the gear entity; The fusion device is used to perform three-line fusion according to the calculation results of the theoretical model, the experimental measurement results of the gear entity and the calculation results of the measurement model of the gear entity, so as to obtain the data analysis results of the gear meshing contact performance.

6. The gear contact performance data processing system based on three-line fusion according to claim 5, characterized in that: The measurement model of the gear entity is obtained by scanning the measured gear with high-precision scanning equipment before and after each gear entity measurement experiment, and obtaining its contour point cloud respectively, which is constructed from the contour point cloud.

7. The gear contact performance data processing system based on three-line fusion according to claim 6, characterized in that: The gear errors of the measured model include: tooth surface error, tooth profile error, surface error and pitch deviation in the gear entity.

8. The gear contact performance data processing system based on three-line fusion according to claim 7 is characterized in that: According to the meshing position in the measurement model, a calculation result for the measurement model is obtained, wherein the calculation result is the tooth surface flash temperature generated when different positions on the tooth surface are meshed.

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