CN-122016543-A - Method and system for testing wear resistance of rubber sealing element

CN122016543ACN 122016543 ACN122016543 ACN 122016543ACN-122016543-A

Abstract

The invention relates to the technical field of wear measurement, in particular to a method and a system for testing the wear resistance of a rubber sealing element, wherein tangential friction torque and normal compression displacement sequences are synchronously acquired, corresponding time window data segments are extracted, weighted accumulated torque and friction interface temperature gradients are subjected to standardized multiplication to construct thermal coupling accumulated damage parameters, a torque maximum value and displacement minimum value are extracted to construct an envelope boundary sequence, discrete cross correlation operation is carried out to establish torque displacement correlation characteristics, and the correlation characteristic of the mechanical dimension and the accumulated damage of the thermophysical dimension are fused to generate a multi-physical-quantity coupling correlation characteristic value, the change intensity of the microstructure is tracked by combining the historical evolution difference value of the characteristic value, the microscopic peeling starting point of the surface material is accurately captured, the limitation of single data measurement is overcome, the qualitative and quantitative evaluation of multi-dimensional physical parameter fusion is realized, and the accuracy of the abrasion resistance state test conclusion is ensured.

Inventors

LI YUANBO
WANG WEIMING
CHEN JIANXIN
CUI WEIBING
ZHANG FANGCAN
LIN ZHANGPING
Lin Jiangxing

Assignees

浙江赛阳密封件有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The method for testing the wear resistance of the rubber sealing piece is characterized by comprising the following steps of: S1, acquiring a tangential friction torque continuous numerical sequence and a normal compression displacement continuous numerical sequence of a rubber sealing member in a test period of relative friction operation action of the rubber sealing member on a performance test bed, and intercepting a moment first data segment and a displacement second data segment from the tangential friction torque continuous numerical sequence and the normal compression displacement continuous numerical sequence; s2, carrying out weighted calculation on the tangential friction torque continuous numerical sequence to obtain a weighted torque accumulated value, obtaining a friction interface temperature gradient value at the current moment, and carrying out standardized mapping on the weighted torque accumulated value to generate a thermal coupling accumulated damage degree value; s3, screening maximum values in the first moment data segment to generate an envelope value sequence on a moment extremum, and screening minimum values in the second displacement data segment to generate an envelope value sequence under a displacement extremum; S4, performing cross-correlation operation on the moment extremum upper envelope value sequence and the displacement extremum lower envelope value sequence to generate a cross-correlation matrix, extracting diagonal extremum of the cross-correlation matrix, and calculating the ratio of the diagonal extremum to the thermal coupling cumulative damage degree value to serve as a multi-physical quantity coupling correlation characteristic value; And S5, calculating the deviation between the coupling correlation characteristic values of the multiple physical quantities and the coupling correlation characteristic values of the multiple physical quantities, judging whether the rubber sealing element reaches the wear microscopic peeling critical point, and generating a wear resistance state test result of the rubber sealing element.
2. The method according to claim 1, wherein the first moment data segment includes a start tangential friction torque term, a process tangential friction torque term, and a finish tangential friction torque term, the second displacement data segment includes a start normal displacement term, a process normal displacement term, and a finish normal displacement term, the thermal coupling cumulative damage degree value is specifically a single quantitative value calculated by a standardized mapping relation between a weighted torque cumulative value and a friction interface temperature gradient value at the current time, the sequence of moment extremum upper envelope values includes an initial maximum torque term, a middle maximum torque term, and a finish maximum torque term, the sequence of displacement extremum lower envelope values includes an initial minimum displacement term, a middle minimum displacement term, and a finish minimum displacement term, the multiple physical quantity coupling correlation characteristic values are specifically single characteristic correlation values calculated by a proportional relation between a diagonal extremum and a thermal coupling cumulative damage degree value, and the rubber seal wear performance state test result includes a characteristic value history deviation record, a critical point determination mark, and a seal wear state.
3. The method for testing the wear resistance of the rubber sealing member according to claim 1, wherein the step S1 is specifically: S101, in a period that the rubber sealing member performs relative friction operation action test on the performance test bed, acquiring a tangential friction torque continuous numerical sequence of the rubber sealing member through a torque sensor, defining a corresponding time window range, and generating a tangential friction torque time window; s102, synchronously acquiring a normal compression displacement continuous numerical sequence of the rubber sealing element through a displacement sensor in the same test period, and defining a corresponding time window range to obtain a normal displacement time window; And S103, extracting a moment value set in a defined range corresponding to the tangential friction torque time window to obtain a moment first data segment, and extracting a normal displacement value set in a defined range corresponding to the normal displacement time window to obtain a displacement second data segment.
4. The method for testing the wear resistance of the rubber sealing member according to claim 1, wherein the step S2 is specifically: S201, inputting the tangential friction torque continuous numerical sequence into a Grunwald-Letnikov discretization algorithm, and executing weighted operation on each tangential friction torque value in the tangential friction torque continuous numerical sequence based on a preset attenuation factor to obtain a weighted torque accumulation numerical value; S202, acquiring a friction surface temperature value of a rubber sealing member at the current moment and an internal measuring point temperature value at the current moment through an infrared temperature measuring probe in the same test period, and calculating a friction interface temperature gradient value at the current moment by combining the distance between the surface of the preset rubber sealing member and the internal measuring point; and S203, performing standardization processing on the weighted torque accumulation value and the current moment friction interface temperature gradient value, and calculating the product of the standardized weighted torque accumulation value and the current moment friction interface temperature gradient value as a thermal coupling accumulated damage degree value.
5. The method for testing the wear resistance of the rubber sealing member according to claim 1, wherein the step S3 is specifically: S301, judging the magnitude relation between the tangential friction torque value of the current node in the moment first data segment and tangential friction torque values of front and rear adjacent time nodes, screening nodes which are larger than the tangential friction torque maximum value corresponding to the front and rear adjacent items, and carrying out time sequence sorting to obtain a moment maximum value node sequence; s302, judging the magnitude relation between the normal compression displacement value of the current node in the displacement second data segment and the normal compression displacement value of the front and rear adjacent time nodes, screening nodes smaller than the normal compression displacement minimum value corresponding to the front and rear adjacent items, and carrying out time sequence sorting to obtain a displacement minimum value node sequence; s303, carrying out interpolation connection processing on each tangential friction torque maximum value in the moment maximum value node sequence to obtain a maximum value envelope boundary state, carrying out interpolation connection processing on each normal compression displacement minimum value in the displacement minimum value node sequence to obtain a minimum value envelope boundary state, and respectively constructing an upper envelope value sequence of a moment extreme value and a lower envelope value sequence of a displacement extreme value.
6. The method for testing the wear resistance of the rubber sealing member according to claim 1, wherein the step S4 is specifically: s401, taking the envelope value sequence on the moment extremum as a first signal source, taking the envelope value sequence under the displacement extremum as a second signal source, performing discrete cross-correlation operation processing on data point items corresponding to the first signal source and the second signal source, and establishing a moment displacement cross-correlation matrix; s402, screening the maximum cross correlation value in the main diagonal area of the moment displacement cross correlation matrix as a moment and displacement associated characteristic representative item to obtain a diagonal extremum; s403, calculating the ratio of the diagonal extremum to the thermal coupling accumulated damage degree value to obtain a multi-physical quantity coupling correlation characteristic value.
7. The method for testing the wear resistance of the rubber sealing member according to claim 1, wherein the step S5 is specifically: s501, reading a history multi-physical-quantity coupling association characteristic value corresponding to the previous test period record association, and calculating a difference value between the current multi-physical-quantity coupling association characteristic value and the history multi-physical-quantity coupling association characteristic value to be used as a state change intensity value; s502, when the state change intensity value exceeds a preset judging threshold value, judging that the rubber sealing piece reaches a critical state of a micro-shedding starting point of a surface material structure, and obtaining a judgment result of a wear micro-shedding critical point; And S503, summarizing and archiving the state of the test period for the judging result of the micro peeling critical point of the abrasion, and finishing the material consumption and the structural damage evolution evaluation data expression of the rubber sealing element in the test period of the friction operation action of the time to obtain the test result of the abrasion resistance state of the rubber sealing element.
8. The method for testing the wear resistance of the rubber sealing member according to claim 4, wherein the process of setting the preset damping factor is as follows: Obtaining the total number of time nodes of a tangential friction torque continuous numerical sequence; Acquiring an initial attenuation standard quantity of a Grunwald-Letnikov discretization algorithm as a preset initial reference value; and executing positive correlation mapping processing on a preset initial reference value according to the total number of time nodes of the tangential friction torque continuous numerical sequence to obtain an attenuation factor.
9. The method for testing the wear resistance of the rubber sealing member according to claim 4, wherein the distance between the surface of the rubber sealing member and the inner measuring point is set according to the total thickness dimension parameter of the radial solid section of the rubber sealing member and the detection depth parameter corresponding to the infrared temperature measuring probe.
10. A system for testing the wear resistance of a rubber seal, wherein the system is used for implementing the method for testing the wear resistance of a rubber seal according to any one of claims 1 to 9, and the system comprises: The data acquisition and interception module acquires a tangential friction torque continuous numerical sequence and a normal compression displacement continuous numerical sequence of the rubber sealing element in a test period of relative friction operation action of the rubber sealing element on the performance test bed, and intercepts a moment first data segment and a displacement second data segment from the tangential friction torque continuous numerical sequence and the normal compression displacement continuous numerical sequence; The thermal coupling damage calculation module performs weighted calculation on the tangential friction torque continuous numerical sequence to obtain a weighted torque accumulated value, obtains a friction interface temperature gradient value at the current moment, performs standardized mapping on the weighted torque accumulated value, and generates a thermal coupling accumulated damage degree value; The extreme value envelope sequence generation module is used for screening the maximum value in the first moment data segment to generate an envelope value sequence on the moment extreme value, screening the minimum value in the second displacement data segment to generate an envelope value sequence under the displacement extreme value; The coupling correlation characteristic calculation module is used for performing cross-correlation operation on the envelope value sequence on the moment extremum and the envelope value sequence under the displacement extremum to generate a cross-correlation matrix, extracting a diagonal extremum of the cross-correlation matrix, and calculating the ratio of the diagonal extremum to the thermal coupling cumulative damage degree value to serve as a multi-physical quantity coupling correlation characteristic value; And the wear resistance state evaluation module calculates the deviation between the multi-physical quantity coupling correlation characteristic value and the historical multi-physical quantity coupling correlation characteristic value, judges whether the rubber sealing piece reaches a wear microscopic peeling critical point, and generates a test result of the wear resistance state of the rubber sealing piece.

Description

Method and system for testing wear resistance of rubber sealing element Technical Field The invention relates to the technical field of wear measurement, in particular to a method and a system for testing wear resistance of a rubber sealing element. Background The technical field of wear measurement mainly relates to quantitative evaluation of material loss and physical property degradation degree of various materials and devices under working conditions such as stressed friction, scraping and the like, and a systematic test system of material loss and environmental parameters is established by simulating the application of specific mechanical stress thermal stress or chemical corrosion conditions in an actual service environment and observing the appearance change, the quality reduction and the mechanical index change of the surface of the material. The method for testing the abrasion resistance of the traditional rubber sealing member generally comprises the steps of constructing a monitoring interface by adopting an integrated programming environment, configuring a data acquisition card to simulate an input channel to read a voltage pulse signal output by a friction torque sensor, writing a mechanical value and a corresponding system timestamp into a comma separated value format table file according to rows, triggering a Boolean true value to cut off a serial port output instruction of a stepping motor when a global variable count value reaches a set cycle end condition, and finally reading coordinate values in the table file row by a specific script and carrying out trapezoidal area accumulation summation to obtain abrasion evaluation basic data. According to the traditional rubber sealing member wear resistance test method, a single friction moment pulse signal is read by means of a data acquisition card, simple geometric trapezoid area accumulation and summation are directly carried out to obtain evaluation basic data, the operation mode is only stopped at the shallow layer dimension of a single mechanical physical quantity, complex thermal interaction caused by a cutting friction action is caused, a test system cannot reflect the real stress and heating coupling state of a rubber material in an operation period, meanwhile, hysteresis processing logic of the single-dimension data is very easy to mask early degradation signs of a microstructure of the material in a long period test, critical starting points of microscopic peeling of a surface layer of the material cannot be accurately captured, and finally serious distortion exists in an overall wear resistance state evaluation conclusion, so that reliable safety guidance is difficult to provide for the real service life evolution of the sealing member. Disclosure of Invention In order to solve the technical problems in the prior art, the embodiment of the invention provides a method for testing the wear resistance of a rubber sealing piece, which comprises the following steps: in order to achieve the above purpose, the invention adopts the following technical scheme that the method for testing the wear resistance of the rubber sealing element comprises the following steps: S1, acquiring a tangential friction torque continuous numerical sequence and a normal compression displacement continuous numerical sequence of a rubber sealing member in a test period of relative friction operation action of the rubber sealing member on a performance test bed, and intercepting a moment first data segment and a displacement second data segment from the tangential friction torque continuous numerical sequence and the normal compression displacement continuous numerical sequence; s2, carrying out weighted calculation on the tangential friction torque continuous numerical sequence to obtain a weighted torque accumulated value, obtaining a friction interface temperature gradient value at the current moment, and carrying out standardized mapping on the weighted torque accumulated value to generate a thermal coupling accumulated damage degree value; s3, screening maximum values in the first moment data segment to generate an envelope value sequence on a moment extremum, and screening minimum values in the second displacement data segment to generate an envelope value sequence under a displacement extremum; S4, performing cross-correlation operation on the moment extremum upper envelope value sequence and the displacement extremum lower envelope value sequence to generate a cross-correlation matrix, extracting diagonal extremum of the cross-correlation matrix, and calculating the ratio of the diagonal extremum to the thermal coupling cumulative damage degree value to serve as a multi-physical quantity coupling correlation characteristic value; And S5, calculating the deviation between the coupling correlation characteristic values of the multiple physical quantities and the coupling correlation characteristic values of the multiple physical quantities, judging whether the