Analysis method and system for vehicle wheel set press fitting curve

Abstract

The invention discloses an analysis method and system for a vehicle wheel set press-fitting curve, and the analysis method comprises the steps: establishing a wheel set press-fitting curve, carrying out the system judgment, displaying a result, and the like. 12 judgment item points including the maximum pressure, the terminal pressure, the curve projection length, the starting point steep rise, the pressure stability, the pressure rise, the middle flat straight line length, the tail end flat straight line length, the tail end descending length, the tail end pressure descending value, the tail end flat straight line, the total descending length and the pressure characteristics are judged and analyzed; whether the wheel set press fitting curve meets the requirement or not is automatically and accurately judged according to whether the judgment item points meet the corresponding judgment indexes or not, meanwhile, the identification and judgment of the unqualified item points provide a basis for the quality improvement of the subsequent press fitting process, the improvement of the wheel set press fitting quality is promoted, product repair is avoided, and then the press fitting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of railway vehicle wheel set press-fitting, and in particular to an analysis method and system for a vehicle wheel set press-fitting curve. Background Art

[0002] Wheelsets are key components of the running gear of railway vehicles. The quality of their press-fitting is directly related to the safety of vehicle operation. After the wheelset is pressed, the quality of the press-fitting is mainly determined by judging the wheelset press-fitting curve.

[0003] At present, the wheelset pressing equipment can only perform simple item point judgment on the wheelset pressing curve, and there is no accurate wheel set pressing curve judgment measure. After the vehicle wheelset is pressed, the wheelset pressing curve is mainly judged manually. Missed judgment and misjudgment often occur, affecting the quality of railway vehicle wheelset pressing. Summary of the invention

[0004] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides an analysis method and system for the vehicle wheelset press-fitting curve. The judgment and analysis operation is simple and easy to use, and can automatically and accurately determine whether the wheelset press-fitting curve meets the requirements. At the same time, the identification and determination of unqualified points in the wheelset press-fitting curve provides a basis for improving the quality of the subsequent press-fitting process, promotes the improvement of the wheelset press-fitting quality, avoids product repairs, and thereby improves the press-fitting efficiency.

[0005] In a first aspect of the present invention, a method for analyzing a vehicle wheelset press curve is provided, comprising:

[0006] Steps for establishing wheelset press-fitting curve: According to the press-fitting force-displacement data automatically generated from the press-fitting process, establish a wheelset press-fitting curve with displacement as the horizontal coordinate and press-fitting force as the vertical coordinate, expressed as F(S) = {(F1, S1), (F2, S2), …, (F i ,S i ),…,(F n ,S n )}, where i = 1, 2, ..., n, (F i ,S i ) indicates that the relative displacement between the wheel and the axle during the press-fitting process is S i When the pressure is F i ;

[0007] System determination step: perform determination analysis on the 12 determination points of the established wheelset press-fitting curve, and determine whether the wheelset press-fitting curve meets the requirements based on whether each determination point meets the corresponding determination index, wherein the 12 determination points and the corresponding determination indexes are:

[0008] (1) Maximum pressure Fmax. The maximum pressure should be less than the theoretical maximum press force, that is, Fmax = MAX(F i )<FMAX;

[0009] (2) End point pressure F n The final pressure is determined by the fact that the final pressure should be greater than the theoretical minimum pressing force, that is, F n >FMIN;

[0010] (3) Curve projection length S n The curve projection length should be no less than 80% of the theoretical length of the wheelset press curve, that is, S n ≥80%×S, where S is the theoretical length of the wheelset press-fit curve, which is the press-fit design matching length of the axle and wheel of the press-fit wheelset;

[0011] (4) Steep rise at the starting point. The indicator for determining the steep rise at the starting point is that the pressure rise does not exceed 98KN within the range of 0 to 1mm at the beginning of the wheelset press-fitting curve, that is: F i ≤98KN, 0≤Si≤1mm;

[0012] (5) Stable pressure. The criterion for stable pressure is that the difference in pressure between adjacent points on the wheelset press curve from the start of the pressure stage to the end of the curve does not exceed 30KN, that is: |F i+1 -F i |≤30KN, 1mm<S i <S i+1 ≤S n ;

[0013] (6) Pressure rise: The pressure rise indicator is that in the range from the initial stage to the maximum pressure position on the wheelset press fitting curve, the pressure of the latter point is not less than the pressure of the former point, that is, F i+1 -F i ≥0,1mm<S i <S i+1 ≤S j ,F j =Fmax;

[0014] (7) Length of the middle flat line: The criterion for determining the length of the middle flat line is that the length range L1 where the pressure values ​​of two adjacent points are the same from the initial stage to the position of the maximum press-fitting force on the wheelset press-fitting curve satisfies the following: L1 = ∑(S i+1 -S i )≤10%×S,1mm<S i <S i+1 ≤S j ,Fj =Fmax, F i =F i+1 ;

[0015] (8) Length of the terminal flat line: The criterion for determining the length of the terminal flat line is that the length range L2 between the maximum press-fitting force position on the wheelset press-fitting curve and the end point of the curve where the pressure values ​​of two adjacent points are the same satisfies: S j <S i <S i+1 ≤S n , F j =Fmax, F i =F i+1 ;

[0016] (9) Terminal drop length: The terminal drop length is determined by the length range L3 where the pressure of the latter point is less than the pressure of the former point in the range from the maximum press-fitting force position to the end point of the wheelset press-fitting curve: S j <S i <S i+1 ≤S n , F j =Fmax, F i+1 <F i ;

[0017] (10) Terminal pressure drop value: The terminal pressure drop value is determined by Fmax-F n ≤5%×FMAX;

[0018] (11) Total length of the flat line at the end and the drop: Within the range from the maximum pressing force position to the end point of the wheelset pressing curve, the total length range L4 where the pressure values ​​of two adjacent points are the same and the pressure of the latter point is less than the pressure of the former point satisfies the following conditions: S j <S i <S i+1 ≤S n , F j =Fmax, F i+1 ≤F i ;

[0019] (12) Pressure characteristics: A straight line is formed between the point where the curve starts to rise and the point at the end point corresponding to the theoretical minimum press-fitting force. All points on the wheelset press-fitting curve should be above this straight line, that is: (F i / S i )>[FMIN / (S n -S i )],F i+1≥0, F i =0;

[0020] Result display step: displaying the wheelset press-fitting curve graph and the determination results of each determination item point;

[0021] Among them, Fmax is the maximum pressure, MAX(F i ) is the maximum value of the pressure value at any i position on the wheelset press-fitting curve, FMAX is the theoretical maximum press-fitting force, FMIN is the theoretical minimum press-fitting force, S n is the curve projection length, F n is the pressure at the end of the curve, S i is the relative displacement between the wheel and the axle at position i on the wheelset press curve, F i is the pressure at position i on the wheelset press curve, S i+1 is the relative displacement between the wheel and the axle at any i+1 position after position i on the wheelset press curve, F i+1 is the pressure at any i+1 position after position i on the wheelset press curve, S j is the relative displacement between the wheel and the axle at any j position after position i on the wheelset press curve, F j It is the pressure at any j position after position i on the wheelset press curve.

[0022] Furthermore, in the above-mentioned analysis method for the vehicle wheelset press-fitting curve, the result display step also includes the following steps: if there are unqualified points, the wheelset press-fitting equipment is adjusted for subsequent press-fitting based on the determination result of the determination point to adjust the unqualified points to qualified points.

[0023] Furthermore, in the above-mentioned analysis method for the vehicle wheelset press-fitting curve, for a wheelset with a given press-fitting force range, the theoretical maximum press-fitting force and the theoretical minimum press-fitting force are respectively the maximum value and the minimum value of the press-fitting force range; for a wheelset with no given press-fitting force range, the maximum press-fitting force coefficient and the minimum press-fitting force coefficient are first set, and then the theoretical maximum press-fitting force and the theoretical minimum press-fitting force are calculated based on the maximum and minimum press-fitting force coefficients and the wheel hub hole diameter.

[0024] Furthermore, in the above-mentioned analysis method for the vehicle wheelset press-fitting curve, a parameter and information collection step is included before the step of establishing the wheelset press-fitting curve. The collected parameters and information include: wheelset product model, axle number and wheel number of the wheelset, wheelset press-fitting direction, wheelset press-fitting force range, theoretical length of the wheelset press-fitting curve, wheel hub hole diameter, effective convex overhang, and original data of the press-fitting curve, wherein the original data of the press-fitting curve is the press-fitting force-displacement data automatically generated and extracted from the press-fitting process.

[0025] In a second aspect of the present invention, a system for analyzing a vehicle wheelset press-fitting curve is provided, which is used to implement the above-mentioned method for analyzing a vehicle wheelset press-fitting curve, comprising:

[0026] A wheelset press-fitting curve establishment module is used to establish a wheelset press-fitting curve based on the press-fitting force-displacement data automatically generated from the press-fitting process;

[0027] The system determination module is used to perform determination analysis on the determination items of the established wheelset press-fitting curve, and determine whether the wheelset press-fitting curve meets the requirements according to whether each determination item satisfies the corresponding determination index;

[0028] The result display module is used to display the wheelset press fitting curve graph and the judgment results of each judgment item point, helping the wheelset press fitting operator to judge whether the wheelset press fitting is qualified and identify unqualified items.

[0029] In a third aspect of the present invention, a system for analyzing a vehicle wheelset press-fitting curve is provided, comprising:

[0030] processor;

[0031] A memory, the memory is coupled to the processor and stores executable program codes, wherein the processor calls the executable program codes stored in the memory to execute the above-mentioned analysis method for the vehicle wheelset press-fitting curve.

[0032] In a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are called, the above-mentioned analysis method for the vehicle wheelset press-fitting curve is executed.

[0033] The analysis method and system for the vehicle wheelset press-fitting curve of the present invention have the following advantages and beneficial effects:

[0034] By implementing the present invention, 12 judgment items, including maximum pressure, end pressure, curve projection length, steep rise at the starting point, stable pressure, pressure rise, middle flat line length, end flat line length, end drop length, end pressure drop value, end flat line and total drop length, and pressure characteristics, are judged and analyzed. Whether the wheelset press-fitting curve meets the requirements is automatically and accurately judged based on whether each judgment item meets the corresponding judgment index. At the same time, the identification and judgment of unqualified items provide a basis for improving the quality of the subsequent press-fitting process, promotes the improvement of the wheelset press-fitting quality, avoids product repairs, and further improves the press-fitting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 Schematic diagram of a flow chart of a method for analyzing a vehicle wheelset press-fitting curve according to Embodiment 1 of the present invention;

[0038] Figure 2 A wheelset press-fitting curve graph and a schematic diagram of determination results of each determination item point displayed for implementing the analysis method for a wheelset press-fitting curve of a vehicle according to Embodiment 1 of the present invention;

[0039] Figure 3 This is a schematic block diagram of a system for analyzing a vehicle wheelset press-fitting curve according to Embodiment 2 of the present invention;

[0040] Figure 4 This is a schematic block diagram of the structure of the analysis system for the vehicle wheelset press-fitting curve according to embodiment 3 of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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 making creative work are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1 and Figure 2 As shown, the analysis method for the vehicle wheelset press-fitting curve provided in Example 1 of the present invention includes:

[0044] Steps for establishing wheelset press-fitting curve: According to the press-fitting force-displacement data automatically generated from the press-fitting process, establish a wheelset press-fitting curve with displacement as the horizontal coordinate and press-fitting force as the vertical coordinate, expressed as F(S) = {(F1, S1), (F2, S2), …, (F i ,Si ),…,(F n ,S n )}, where i = 1, 2, ..., n, (F i ,S i ) indicates that the relative displacement between the wheel and the axle during the press-fitting process is S i When the pressure is F i .

[0045] System determination steps: Perform determination analysis on the following 12 determination points of the established wheelset press-fitting curve, and determine whether the wheelset press-fitting curve meets the requirements based on whether each determination point meets the corresponding determination index. The 12 determination points and corresponding determination indexes are:

[0046] (1) Maximum pressure Fmax: The maximum pressure refers to the actual maximum pressing force of the wheel on the pressing curve. The maximum pressure is determined by the maximum pressure being less than the theoretical maximum pressing force, i.e., Fmax = MAX(Fmax) i )<FMAX;

[0047] (2) End point pressure F n : The end point pressure refers to the pressing force of the wheel at the end point of the pressing curve. The judgment index of the end point pressure is that the end point pressure should be greater than the theoretical minimum pressing force, that is: F n >FMIN;

[0048] (3) Curve projection length S n : Curve projection length refers to the actual projection length of the wheelset press curve on the displacement coordinate axis. The determination index of the curve projection length is that the curve projection length should not be less than 80% of the theoretical length of the wheelset press curve, that is: S n ≥80%×S, where S is the theoretical length of the wheelset press-fit curve, which is the press-fit design matching length of the axle and wheel of the press-fit wheelset;

[0049] (4) Steep rise at the starting point: Steep rise at the starting point refers to the steep rise in the press-fitting force caused by the surface quality of the wheel-axle mating part at the initial stage of the wheelset press-fitting curve. The judgment index of the steep rise at the starting point is that the pressure rise within the range of 0 to 1 mm at the initial stage of the wheelset press-fitting curve does not exceed 98KN, that is: F i ≤98KN, 0≤Si≤1mm;

[0050] (5) Stable pressure: Stable pressure means that the wheelset press curve should have a smooth transition except for the initial stage, and there should be no steep rise in the curve due to reasons such as strain. Specifically, the pressure stability indicator is that the difference in the press force between the front and rear adjacent points on the wheelset press curve within the length range from the initial stage of the pressure to the end of the curve does not exceed 30KN, that is: |F i+1 -F i|≤30KN, 1mm<S i <S i+1 ≤S n ;

[0051] (6) Pressure rise: Pressure rise refers to the range of the wheelset press fitting curve from the initial stage to the maximum press fitting force. Except for the wheel oil filling groove, the press fitting force should gradually increase and should not decrease. Specifically, the pressure rise is determined by the pressure value of the latter point in the range from the initial stage to the maximum press fitting force on the wheelset press fitting curve. It is required that the pressure of the latter point should not be less than the pressure of the former point, that is, F i+1 -F i ≥0,1mm<S i <S i+1 ≤S j ,F j =Fmax;

[0052] (7) Length of the middle flat line: The length of the middle flat line refers to the length of the flat line contained in the curve range from the starting stage to the maximum pressing force on the wheelset press curve. The length of the middle flat line should not exceed 10% of the theoretical length of the wheelset press curve. Specifically, the determination index of the length of the middle flat line is that within the range from the starting stage to the maximum pressing force position on the wheelset press curve, the length range L1 of the pressure values ​​of two adjacent points with the same value satisfies: L1 = ∑(S i+1 -S i )≤10%×S,1mm<S i <S i+1 ≤S j ,F j =Fmax, F i =F i+1 ;

[0053] (8) Length of the terminal flat line: The length of the terminal flat line refers to the length of the flat line contained in the curve range from the maximum press force position on the wheelset press curve to the end point of the curve. The length of the terminal flat line should not exceed 15% of the theoretical length of the wheelset press curve. Specifically, the determination index of the length of the terminal flat line is that within the range from the maximum press force position on the wheelset press curve to the end point of the curve, the length range L2 where the pressure values ​​of two adjacent points are the same satisfies: S j <S i <S i+1 ≤S n , F j =Fmax, F i =F i+1 ;

[0054] (9) Terminal drop length: The terminal drop length refers to the length of the pressure drop contained in the curve range from the maximum press force position on the wheelset press curve to the end point of the curve. When the pressure at the end of the curve drops, the terminal drop length should not exceed 10% of the theoretical length of the wheelset press curve. Specifically, the determination index of the terminal drop length is that in the range from the maximum press force position on the wheelset press curve to the end point of the curve, the length range L3 where the pressure of the latter point is less than the pressure of the former point satisfies: S j <S i <S i+1 ≤S n , F j =Fmax, F i+1 <F i ;

[0055] (10) Terminal pressure drop value: The terminal pressure drop value refers to the difference between the maximum pressing force and the end pressure on the wheel pair pressing curve. When the pressure at the end of the curve drops, the terminal pressure drop value shall not exceed 5% of the theoretical maximum pressing force. Specifically, the judgment index of the terminal pressure drop value is, Fmax-F n ≤5%×FMAX;

[0056] (11) The end flat line and the total length of the drop: The pressure drop value at the end meets the above Fmax-F n ≤5%×FMAX, the sum of the end flat line length and the end drop length shall not exceed 15% of the theoretical length of the wheelset press curve, that is, within the range from the maximum press force position on the wheelset press curve to the end point of the curve, the total length range L4 where the pressure values ​​of two adjacent points are the same and the pressure of the latter point is less than the pressure of the former point satisfies: S j <S i <S i+1 ≤S n , F j =Fmax, F i+1 ≤F i ;

[0057] (12) Pressure characteristics: Pressure characteristics refer to the slope characteristics of the wheelset press-fitting curve corresponding to pressure and displacement. A straight line is formed between the point where the curve starts to rise and the point at the end point corresponding to the theoretical minimum press-fitting force. All points on the wheelset press-fitting curve should be above this straight line, that is: (F i / S i )>[FMIN / (S n -S i )],F i+1 ≥0, F i =0.

[0058] Among them, Fmax is the maximum pressure, MAX(F i ) is the maximum value of the pressure value at any i position on the wheelset press-fitting curve, FMAX is the theoretical maximum press-fitting force, FMIN is the theoretical minimum press-fitting force, S n is the curve projection length, F n is the pressure at the end of the curve, S i is the relative displacement between the wheel and the axle at position i on the wheelset press curve, F i is the pressure at position i on the wheelset press curve, S i+1 is the relative displacement between the wheel and the axle at any i+1 position after position i on the wheelset press curve, F i+1 is the pressure at any i+1 position after position i on the wheelset press curve, S j is the relative displacement between the wheel and the axle at any j position after position i on the wheelset press curve, F j It is the pressure at any j position after position i on the wheelset press curve.

[0059] Result display step: Display the wheelset press-fitting curve graph and the determination results of each determination item point, to help the wheelset press-fitting operator determine whether the wheelset press-fitting is qualified and identify unqualified items. It goes without saying that in the result display step, relevant information of the determined wheelset can also be displayed.

[0060] Furthermore, in the analysis method for the vehicle wheelset press-fitting curve of the present invention, the result display step also includes the following steps: if there are unqualified points, the wheelset press-fitting equipment is adjusted for subsequent press-fitting based on the determination result of the determination point, so as to adjust the unqualified points to qualified points, thereby ensuring the wheelset press-fitting quality and improving the press-fitting efficiency.

[0061] Furthermore, in the analysis method for the press-fitting curve of the vehicle wheelset of the present invention, the theoretical maximum press-fitting force and the theoretical minimum press-fitting force refer to the press-fitting force range that the wheel and axle combination should reach in the wheelset design process to meet its performance. For a wheelset with a given press-fitting force range, the theoretical maximum press-fitting force and the theoretical minimum press-fitting force are the maximum value and the minimum value of the press-fitting force range, respectively; for a wheelset with an ungiven press-fitting force range, it is necessary to set the maximum press-fitting force coefficient and the minimum press-fitting force coefficient, and then calculate the theoretical maximum press-fitting force and the theoretical minimum press-fitting force according to the maximum and minimum press-fitting force coefficients and the wheel hub hole diameter, that is, the theoretical maximum press-fitting force FMAX = wheel hub hole diameter × maximum press-fitting force coefficient, the theoretical minimum press-fitting force FMIN = wheel hub hole diameter × minimum press-fitting force coefficient, wherein the wheel hub hole diameter is in dm, the maximum press-fitting force coefficient is 5.8KN / dm, and the minimum press-fitting force coefficient is 3.4KN / dm.

[0062] Furthermore, in the analysis method for the vehicle wheelset press-fitting curve of the present invention, a parameter and information collection step is included before the step of establishing the wheelset press-fitting curve. The collected parameters and information include: wheelset product model, axle number and wheel number of the wheelset, wheelset press-fitting direction (left-side press-fitting or right-side press-fitting), wheelset press-fitting force range, theoretical length of the wheelset press-fitting curve, wheel hub hole diameter, effective convex overhang, and original data of the press-fitting curve, wherein the original data of the press-fitting curve is the press-fitting force-displacement data automatically generated from the press-fitting process.

[0063] Example 2

[0064] Figure 3 The analysis system for the vehicle wheelset press-fitting curve of the second embodiment of the present invention is shown, and the analysis system is used to implement the analysis method for the vehicle wheelset press-fitting curve of the first embodiment. The analysis system for the vehicle wheelset press-fitting curve of the second embodiment of the present invention includes:

[0065] A wheelset press-fitting curve establishing module 301 is used to establish a wheelset press-fitting curve according to the press-fitting force-displacement data automatically generated from the press-fitting process;

[0066] The system determination module 302 is used to perform determination analysis on the determination items of the established wheelset press-fitting curve, and determine whether the wheelset press-fitting curve meets the requirements according to whether each determination item satisfies the corresponding determination index;

[0067] The result display module 303 is used to display the wheelset press-fitting curve graph and the determination results of each determination item point, so as to help the wheelset press-fitting operator to determine whether the wheelset press-fitting is qualified and identify unqualified items.

[0068] Example 3

[0069] Figure 4 The analysis system for the press-fitting curve of a vehicle wheelset according to the third embodiment of the present invention is shown, and the analysis system is used to implement the analysis method for the press-fitting curve of a vehicle wheelset according to the first embodiment. The analysis system for the press-fitting curve of a vehicle wheelset according to the third embodiment of the present invention comprises a processor 401 and a memory 402, wherein the memory 402 is coupled to the processor 401 and stores executable program codes, wherein the processor 401 calls the executable program codes stored in the memory 402 to execute the analysis method for the press-fitting curve of a vehicle wheelset according to the first embodiment.

[0070] Example 4

[0071] Embodiment 4 of the present invention provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are called, they are used to execute the analysis method for the vehicle wheelset press-fitting curve of the above-mentioned embodiment 1.

[0072] The above-mentioned computer-readable storage medium includes, but is not limited to: read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electronically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0073] In summary, by implementing the analysis method and system for the vehicle wheelset press-fitting curve of the present invention, 12 judgment items are analyzed and judged, including maximum pressure, end pressure, curve projection length, steep rise at the starting point, stable pressure, pressure rise, middle flat line length, end flat line length, end drop length, end pressure drop value, end flat line and total drop length, and pressure characteristics. Whether the wheelset press-fitting curve meets the requirements is automatically and accurately judged based on whether each judgment item meets the corresponding judgment index. At the same time, the identification and judgment of unqualified items provide a basis for improving the quality of the subsequent press-fitting process, promote the improvement of the wheelset press-fitting quality, avoid product repairs, and thereby improve the press-fitting efficiency.

[0074] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" 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. At the same time, 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 a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for analyzing a wheel set press curve of a vehicle, characterized in that: include: Steps for establishing wheelset press-fitting curve: According to the press-fitting force-displacement data automatically generated from the press-fitting process, establish a wheelset press-fitting curve with displacement as the horizontal coordinate and press-fitting force as the vertical coordinate, expressed as F(S) = {(F1, S1), (F2, S2), …, (F i ,S i ),…,(F n ,S n )}, where i = 1, 2, ..., n, (F i ,S i ) indicates that the relative displacement between the wheel and the axle during the press-fitting process is S i When the pressure is F i ; System determination step: Perform determination analysis on the 12 determination points of the established wheelset press-fitting curve, and determine whether the wheelset press-fitting curve meets the requirements based on whether each determination point meets the corresponding determination index, wherein the 12 determination points and the corresponding determination indexes are: (1) Maximum pressure Fmax. The maximum pressure should be less than the theoretical maximum press force, that is, Fmax = MAX(F i )<FMAX; (2) End point pressure F n The final pressure is determined by the fact that the final pressure should be greater than the theoretical minimum pressing force, that is, F n >FMIN; (3) Curve projection length S n The curve projection length should be no less than 80% of the theoretical length of the wheelset press curve, that is, S n ≥80%×S, where S is the theoretical length of the wheelset press-fit curve, which is the press-fit design matching length of the axle and wheel of the press-fit wheelset; (4) Steep rise at the starting point. The indicator for determining the steep rise at the starting point is that the pressure rise does not exceed 98KN within the range of 0 to 1mm at the beginning of the wheelset press-fitting curve, that is: F i ≤98KN, 0≤Si≤1mm; (5) Stable pressure. The criterion for stable pressure is that the difference in pressure between adjacent points on the wheelset press curve from the start of the pressure stage to the end of the curve does not exceed 30KN, that is: |F i+1 -F i |≤30KN, 1mm<S i <S i+1 ≤S n ; (6) Pressure rise: The pressure rise indicator is that in the range from the initial stage to the maximum pressure position on the wheelset press fitting curve, the pressure of the latter point is not less than the pressure of the former point, that is, F i+1 -F i ≥0,1mm<S i <S i+1 ≤S j ,F j =Fmax; (7) Length of the middle flat line: The criterion for determining the length of the middle flat line is that the length range L1 where the pressure values ​​of two adjacent points are the same from the initial stage to the position of the maximum press force on the wheelset press fitting curve satisfies the following: L1 = ∑(s i+1 -s i )≤10%×S,1mm<S i <S i+1 ≤S j ,F j =Fmax, F i =F i+1 ; (8) Length of the terminal flat line: The criterion for determining the length of the terminal flat line is that the length range L2 between the maximum press-fitting force position on the wheelset press-fitting curve and the end point of the curve where the pressure values ​​of two adjacent points are the same satisfies: S j <S i <S i+1 ≤S n , F j =Fmax, F i =F i+1 ; (9) Terminal drop length: The terminal drop length is determined by the length range L3 where the pressure of the latter point is less than the pressure of the former point in the range from the maximum press-fitting force position to the end point of the wheelset press-fitting curve: S j <S i <S i+1 ≤S n , F j =Fmax, F i+1 <F i ; (10) Terminal pressure drop value: The terminal pressure drop value is determined by Fmax-F n ≤5%×FMAX; (11) The total length of the flat line at the end and the descending length: In the range from the maximum pressing force position to the end point of the wheelset pressing curve, the total length range L4 where the pressure values ​​of two adjacent points are the same and the pressure of the latter point is less than the pressure of the former point satisfies: S j <S i <S i+1 ≤S n , F j =Fmax, F i+1 ≤F i ; (12) Pressure characteristics: A straight line is formed between the point where the curve starts to rise and the point at the end point corresponding to the theoretical minimum press-fitting force. All points on the wheelset press-fitting curve should be above this straight line, that is: (F i / S i )>[FMIN / (S n -S i )],F i+1 ≥0, F i =0; Result display step: displaying the wheelset press-fitting curve graph and the determination results of each determination item point; Among them, Fmax is the maximum pressure, MAX(F i ) is the maximum value of the pressure value at any i position on the wheelset press-fitting curve, FMAX is the theoretical maximum press-fitting force, FMIN is the theoretical minimum press-fitting force, S n is the curve projection length, F n is the pressure at the end of the curve, S i is the relative displacement between the wheel and the axle at position i on the wheelset press curve, F i is the pressure at position i on the wheelset press curve, S i+1 is the relative displacement between the wheel and the axle at any i+1 position after position i on the wheelset press curve, F i+1 is the pressure at any i+1 position after position i on the wheelset press curve, S j is the relative displacement between the wheel and the axle at any j position after position i on the wheelset press curve, F j It is the pressure at any j position after position i on the wheelset press curve.

2. The method for analyzing the press-fitting curve of a vehicle wheelset according to claim 1, characterized in that: The result display step also includes the following steps: if there are unqualified points, adjusting the wheelset press equipment for subsequent press fitting based on the determination result of the determination point to adjust the unqualified points to qualified points.

3. The method for analyzing the press-fitting curve of a vehicle wheelset according to claim 1, characterized in that: For a wheelset within a given press-fitting force range, the theoretical maximum press-fitting force and the theoretical minimum press-fitting force are the maximum value and the minimum value of the press-fitting force range, respectively; For wheelsets without a given press-fitting force range, the maximum press-fitting force coefficient and the minimum press-fitting force coefficient are first set, and then the theoretical maximum press-fitting force and the theoretical minimum press-fitting force are calculated based on the maximum and minimum press-fitting force coefficients and the wheel hub hole diameter.

4. The method for analyzing the press-fit curve of a vehicle wheelset according to claim 1, characterized in that: Before the step of establishing the wheelset press-fitting curve, there is also a step of collecting parameters and information. The collected parameters and information include: wheelset product model, axle number and wheel number of the wheelset, wheelset press-fitting direction, wheelset press-fitting force range, theoretical length of the wheelset press-fitting curve, wheel hub hole diameter, effective convex overhang, and original data of the press-fitting curve, wherein the original data of the press-fitting curve is the press-fitting force-displacement data automatically generated from the press-fitting process.

5. An analysis system for a vehicle wheelset press-fitting curve, used for implementing the analysis method for a vehicle wheelset press-fitting curve according to any one of claims 1 to 4, characterized in that: include: A wheelset press-fitting curve establishment module is used to establish a wheelset press-fitting curve based on the press-fitting force-displacement data automatically generated from the press-fitting process; The system determination module is used to perform determination analysis on the determination items of the established wheelset press-fitting curve, and determine whether the wheelset press-fitting curve meets the requirements according to whether each determination item satisfies the corresponding determination index; The result display module is used to display the wheelset press fitting curve graph and the judgment results of each judgment item point, helping the wheelset press fitting operator to judge whether the wheelset press fitting is qualified and identify unqualified items.

6. A system for analyzing the press-fitting curve of a vehicle wheelset, characterized in that: include: processor; A memory, the memory is coupled to the processor and stores executable program code, wherein the processor calls the executable program code stored in the memory to execute the analysis method for the vehicle wheelset press-fitting curve according to any one of claims 1 to 4.

7. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are called, the method for analyzing a vehicle wheelset press-fitting curve according to any one of claims 1 to 4 is executed.

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