CN-121997640-A - High-performance joint and conduit assembly installation moment parameter test method under complex working condition

CN121997640ACN 121997640 ACN121997640 ACN 121997640ACN-121997640-A

Abstract

The invention provides a method for testing installation moment parameters of a high-performance joint and a conduit assembly under a complex working condition, which belongs to the technical field of tests and comprises the steps of obtaining installation working condition information of the threaded joint and the conduit assembly, obtaining an installation pretightening force boundary through finite element simulation according to the installation working condition information, obtaining a model calculation installation moment boundary through a constructed installation moment boundary calculation model, obtaining a test installation moment boundary according to the installation working condition information, obtaining a literature reference installation moment boundary according to a relevant standard file, establishing a union of the model calculation installation moment boundary, the test installation moment boundary and the literature reference installation moment boundary, obtaining the union installation moment boundary, and carrying out test correction according to the installation working condition information to obtain the installation moment parameters of the high-performance joint and the conduit assembly under the complex working condition. The invention can effectively reduce the test cost and improve the efficiency, accuracy and reliability of the determination of the installation moment parameters.

Inventors

GUO HAORAN
ZHANG ZONGHUA
WU ZILONG
BIAN ZHI
XIANG ZHONGYUAN
LIU XIAOYI

Assignees

华质卓越质量技术服务(北京)有限公司
中国航空综合技术研究所

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (9)

1. A method for testing installation torque parameters of a high-performance joint and a conduit assembly under a complex working condition is characterized by comprising the following steps: S1, acquiring installation condition information of a threaded joint and a conduit assembly, wherein the installation condition information comprises product structure connection information, installation position degree information, installation lubrication information and installation environment information; s2, acquiring an installation pretightening force boundary through finite element simulation according to the installation condition information; S3, according to the installation pre-tightening force boundary, acquiring a model calculation installation moment boundary through a constructed installation moment boundary calculation model; The installation moment boundary calculation model is as follows: T=(F-( E x K x + E y K y + E α K y )) L z ; Wherein T is an installation moment boundary, F is an installation pretightening force boundary, and n is the number of times of load interval values obtained through simulation; F G1 is axial deformation load value data obtained through simulation, L x1 is angle displacement value data obtained corresponding to F G1 , F G2 is radial deformation load value data obtained through simulation, L x2 is angle displacement value data obtained corresponding to F G2 , F G3 is angle error load value data obtained through simulation, L x3 is angle displacement value data obtained corresponding to F G3 , ex is axial position error, ey is axial position error, E α is angle position error, kx is projection component coefficient of axial load in the installation pre-tightening direction, ky is projection component coefficient of radial load in the installation pre-tightening direction, K α is projection component coefficient of angle error load in the installation pre-tightening direction, lz is equivalent friction arm; s4, performing a simulation experiment according to the installation condition information to obtain an experimental installation moment boundary; S5, acquiring a reference installation moment boundary of a literature according to a standard file related to the threaded joint and the catheter assembly; s6, establishing a model to calculate a union of the installation moment boundary, the test installation moment boundary and the literature reference installation moment boundary, and obtaining the union installation moment boundary; and S7, performing test correction according to the installation condition information on the union installation moment boundary to obtain the installation moment parameters of the high-performance joint and the conduit assembly under the complex working condition.
2. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 1, wherein the product structure connection information in the step S1 comprises connector materials, thread parameters, sealing surface shapes and sealing surface angle information, the installation position degree information comprises installation angle deviation, axial deviation and radial deviation information, the installation lubrication information comprises conduit fluid media and lubricant information, and the installation environment information comprises installation environment information such as temperature, humidity and internal pressure.
3. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 1 is characterized in that the installation pre-tightening force boundary in the step S2 comprises a maximum installation pre-tightening force and a minimum installation pre-tightening force, wherein the maximum installation pre-tightening force is 80% of the maximum pre-tightening force when no material yielding occurs to any connecting piece in the joint and conduit assembly in the finite element simulation installation process, and the minimum installation pre-tightening force is 120% of the pre-tightening force when the contact stress of a sealing surface is more than 50MPa and the width of the sealing surface of the assembly reaches 1 mm.
4. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 2, wherein the step S3 comprises the following steps: S31, constructing an installation moment boundary calculation model; T = (F-( E x K x + E y K y + E α K y )) L z ; S32, inputting installation environment information and installation lubrication information as operation backgrounds, performing finite element simulation, fixing a connecting piece comprising a size, a structure and a material combination in product structure connection information at a catheter end, respectively applying axial, radial and angle loads in installation position degree information at the other end of the assembly, namely, from 0% to 85% of yield limit load of the assembly, taking n groups of data, and respectively obtaining load value data F G11 to F Gn 、F G21 to F G2n 、F G31 to F G3n and corresponding angle displacement value data L x11 to L x1n 、L y21 to L y2n 、L α31 to L α3n ; S33, acquiring an axial position error Ex, an axial position error Ey and an angle position error Ealpha through mounting position information; S34, obtaining an included angle alpha 0 between the axial direction of the installed connecting piece and the theoretical axis according to the position error through finite element simulation, and calculating a projection component coefficient as follows: Kx = cosα;Ky = sinα;Kα = sinα; S35, determining an equivalent friction arm Lz according to the product structure connection information; + ; Wherein P is the thread pitch of the pipe joint, Is the pitch diameter of the pipe joint thread, Correcting friction coefficient for the contact surface of the pipe joint and the coat nut; correcting friction coefficient for the contact surface of the sleeve and the sleeve nut; s36, inputting the pre-tightening force boundary data and the data required by the calculation model into the constructed installation moment boundary calculation model to obtain the model calculation installation moment boundary.
5. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 4, wherein the friction coefficient is corrected by the contact surface between the pipe joint and the jacknut in the step S35 Correction friction coefficient of contact surface between pipe sleeve and external nut Respectively is that; =K h K r ; =K h K r ; Wherein, the The friction coefficient is the standard friction coefficient of the contact surface of the pipe joint and the sleeve nut, The standard friction coefficient of the contact surface of the sleeve and the sleeve nut is K h which is the correction coefficient of the environment working condition, K r which is the correction coefficient of the lubrication working condition, 、 K h and K r are obtained by referring to the relevant standard file information.
6. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 1, wherein the step S4 comprises: s41, establishing an environment test box simulation environment according to the installation condition information; S42, acquiring an installation pre-tightening force boundary of the S2, selecting m groups of products in an environment test box, passing through an installation test under a simulation working condition, measuring installation moment condition parameters meeting the maximum and minimum installation pre-tightening force conditions, repeating the test for a plurality of times, and then taking an average value to determine a test installation moment boundary.
7. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working condition according to claim 1 is characterized in that S5 specifically refers to a reference installation torque boundary of a literature of a product under the similar working condition according to relevant standards and product manuals of product configuration.
8. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 1, wherein the step S7 comprises: S71, testing and correcting the minimum mounting moment; Simulating product working conditions, selecting U-group products, simulating product working conditions under the condition of the minimum installation moment in the union installation moment boundary to carry out Ux repeated assembly tests, verifying whether the requirements of the airtight and pressure-resistant tests are met under the minimum installation moment, if the requirements of the airtight and pressure-resistant tests are not met, continuing to increase the standard moment quantity until all the products meet the installation moment required by the test, and determining the minimum installation moment boundary; s72, testing and correcting the maximum mounting moment; Simulating product working conditions, selecting 110-140% of the minimum installation moment in the union installation moment boundary as an initial installation moment condition, carrying out Ux repeated assembly tests by adding standard moment quantity each time, verifying whether U-group products meet the requirements of air tightness and pressure resistance tests under the current installation moment until reaching the maximum installation moment in the union installation moment boundary, and reducing the moment of the standard moment quantity of the standard multiple by the measuring moment as the maximum installation moment when 1-group products do not meet the air tightness and pressure resistance requirements in the process, and if all the standard moment quantity is met, setting the maximum installation moment in the union installation moment boundary as the determined maximum installation moment; s73, testing correction limit installation moment; And simulating the working condition of the product, starting from the maximum installation moment in the boundary of the union installation moment, performing Ux repeated assembly tests, verifying whether the product meets the requirements of airtight and pressure-resistant tests under the installation moment, and if so, continuously increasing the standard moment quantity for testing, wherein when 1 group of products are generated and do not meet the requirements of airtight and pressure resistance or the disassembly failure occurs, the moment is the limit maximum installation moment.
9. The method for testing the installation torque parameters of the high-performance joint and conduit assembly under the complex working conditions according to claim 8, wherein the standard torque quantity is 0.5 N.m and the standard multiple is 4 times.

Description

High-performance joint and conduit assembly installation moment parameter test method under complex working condition Technical Field The invention relates to the technical field of aerospace pipeline connecting piece tests, in particular to a method for testing high-performance joint and conduit assembly installation torque parameters under complex working conditions. Background The pipeline connecting piece is an important basic electromechanical product for fluid transmission and power transmission in an aerospace fluid system, is a gas pipe and a blood vessel of various aerospace aircrafts, and plays a key role in safe and reliable operation of various aerospace equipment. The installation moment parameters are important parameters in the design, verification, manufacture, service and maintenance processes of the aerospace pipeline connector product, and the rationality and the accuracy of the parameters have important influences on the sealing performance, the connection performance and the service life reliability of the pipeline product in the service process. The high-performance connector and the conduit assembly simultaneously have high requirements of high reliability, long service life, light weight, miniaturization and the like, and can be repeatedly disassembled for 8-25 times to meet maintenance requirements, so that the connection reliability of the detachable pipeline products is ensured, and the installation torque parameter range of the products is usually required to be definitely regulated in product technical files. The product installation moment is too small to cause product leakage, the installation moment is too large to cause the product assembly installation stress to be too large to generate microcracks of local structures, the product is in fatigue failure, the whole life cycle requirement of the product cannot be met, the repeated disassembly and assembly requirement cannot be met by the too large moment, meanwhile, the installation moment parameters have enough range to ensure the realizability of the product installation process, the problems of relevant leakage, damage, fatigue failure and the like of installation in the service process are frequently caused, and the installation moment is not good in the actual installation process. Therefore, determining a reasonable installation torque parameter range is one of the key indexes for designing and verifying the pipeline connector product. At present, the installation moment parameters of the pipeline connecting piece are usually determined by two methods, namely, the installation moment parameters are determined by an empirical method and verified by a product identification test under a laboratory standard working condition, and the installation moment parameters are approximated to the maximum and minimum installation moment parameters by a large number of tests. However, the former is inaccurate in determining the installation moment parameters, and the latter is long in test time and high in cost. Therefore, how to realize reliable and low-cost development of the installation moment parameter test and obtain reasonable installation moment parameters is a technical problem to be solved currently. Disclosure of Invention In order to solve the defects of the prior art, the invention aims to provide a high-performance joint and conduit assembly installation moment parameter test method under complex working conditions, which is used for simulating real pressure, installation and structure working conditions of a pipeline product through finite element simulation, providing installation moment parameters under a product simulation state according to a constructed installation moment boundary calculation model, calculating moment parameters, test installation moment parameters and literature experience installation moment parameters through an integration model, rapidly shortening product installation parameter design and verification time, reducing moment test cost, guiding forward design of the pipeline product installation parameters, and improving accuracy and reliability of installation moment parameter determination through combination of simulation theory analysis and test verification. Specifically, the invention provides a method for testing the installation torque parameters of a high-performance joint and conduit assembly under a complex working condition, which comprises the following steps: S1, acquiring installation condition information of a threaded joint and a conduit assembly, wherein the installation condition information comprises product structure connection information, installation position degree information, installation lubrication information and installation environment information; s2, acquiring an installation pretightening force boundary through finite element simulation according to the installation condition information; S3, according to the installation pre-tightening force boundary, acquirin