JB/T 10375-2002 Selection of process parameters for vibration aging of welded components
Some standard content:
1Cs25.160.10
Machinery Industry Standard of the People's Republic of China
JB/10375—2002
Vibration Stress Relief Process for Welded Components
Parameter Selection and Technical Requirements
Recomumended practice fur vibration stress relief on welding structure2002-12-27 Issued
2003-04-01 Implementation
The State Economic and Trade Commission of the People's Republic of China issued the national standard for welding parts. The standard does not allow the selection of symbols for the registration of dynamic time-limited equipment. 5 "Technical selection and technical cost requirements"
Protocol for dynamic time-limited equipment evaluation method
Change A (Informative Appendix: The use of dynamic time-limited technology
JB/T10375-2002
This standard is proposed by the China Machinery Industry Federation. Foreword
This standard is under the jurisdiction of the National Welding Standardization Technical Committee 11. IB/T10375-2002
This standard Program drafting units: Harbin Institute of Technology, Sichuan Zhili Technology Co., Ltd., Sichuan Yuanlun Vibration Aging Co., Ltd., Hebei University of Technology, Shanghai Jiaotong University. Main drafters of this program: Li Di, Zhang Pang: Shuyi, Feng Jiayu, Ran, Chen Ligong 1 Scope
Vibration aging process for welded components
Selection and technical requirements
JB/F10375--2002
This standard specifies the selection and technical requirements of vibration aging process for short-circuited components and the evaluation method of vibration aging effect. This program is applicable to vibration aging treatment of carbon structural steel, low alloy steel, stainless steel, molten and alloyed steel, lead and aluminum alloy, and titanium alloy fusion welded components
2 Normative referenced documents
List of documents 1 clauses become clauses of this standard through non-standard writing. For referenced documents with a date of 1 month, all subsequent corrections (excluding errors or revisions) are not applicable to this standard. However, the parties to the test agreement based on this standard are encouraged to use the latest versions of these documents. For referenced documents with a date of 1 month, the latest version is applicable to this standard. JBT5925.2 Mechanical vibration aging immersion cover technical conditions 3 Terms and symbols
exciting point excitingpoint
The point where the force is applied to the component during vibration aging is called micro-support point. 3.2
support point supportpnint
The support structure selected for the vibration resistance of the component. 3.3||tt| |Dynamic stress dynarnicstress
When a micro-force causes a component to respond, the stress generated inside it is called dynamic stress, its vector sign is 0 (straight), and its unit is (MPu>
esa
When the frequency of the periodic excitation provided by the whole force is close to or equal to the natural frequency of the system, the phenomenon of the component's vibration increases dramatically is 3.5% of the system
Yibrationmode
For the gear shifting, the vibration line (surface) of all the points on the surface of the component is the vibration mode, including potential disk, torsion, torsion electric, platinum vibration mode and missing vibration mode
node line) node,melirm
When the component is in dynamic response, the smallest point of the structure is called the node (node). 3.7
Main sweep frequency prlncipalvihratinnTrequency Within the frequency range of the excitation device, the frequency with low frequency and large position is called the main response.
JR/T103752002
Additional frequency additianalvibrativnfTrequeney other frequencies except the main frequency.
Sweep frequencyweep
The process of adjusting the frequency of the excitation device from small to large with a fixed center is called sweep. 3.10
Sweep frequency curve tllecurve
The relationship between the dynamic response and frequency is called the sweeping curve: for example, A is called the vibration field-rate curve, B is called the acceleration-frequency curve, C is called the acceleration-frequency curve, and D is the product of the vibration reduction device: 12-: A represents the amplitude, D represents the speed, A represents the rated speed, and C represents the motion characteristics. 3.11
Aging curve
Under certain vibration frequency and excitation field, the time curve obtained by pulling the component through the motion is: Among them, I shows the thickness: time.
Vibration welding
When the component is slightly harmonic under the action of small excitation force and the frequency of the test, the process of the process is carried out. 3.13
Frequency analysis [requeneyanalysls
Use the excitation device to make the workpiece vibrate in the same way, and obtain the workpiece frequency distribution. In this process, 4.4.4.4.5.5.6.6.7.8.8.9.10.11.12.13.5.7.9.13.14.15.7.9.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.29.30.31.11.12.13.13.14.15.16.17.18.19.20.21.22.29.29.31.11.12 ...5.16.17.18.19.20.21.22.29.29.31.11.12.13.15.16.17.18.19.20.21.22.29.29.31.11.1 i within:
b) can be drawn online or finally complete and the group of the use of the same level and multiple acceleration and tracking line c) acceleration measurement flow can be the vibration time aging device of the attached material part, also shown as a single dose test piece, 5 process parameter selection and technical requirements
5.1 parameter determination criteria
In general, the dynamic parameters are based on the working conditions of the welded components, and the components are analyzed and judged to be possible small vibrations in the excitation frequency range. The basis will be:
For major pull or key components, the company also makes a finite element analysis of the dynamic disk under the actual standard conditions, and finds that the injection structure is within the specified range! 16Hz--2(K)IIz) There is a known vibration rate: to determine the support point, the excitation point and the vibration point. 5.2 Direct vibration
The structure is within the scope of the investigation rate. If it can excite the response, it can be directly vibrated. 5.2.1 Support selection of components
For components that can be directly reached and the vibration mode can be determined based on the analysis, elastic parameters are placed at the support points. The support points can be two points, three points or four points.
The support of special components should be based on stability
5.2.2 Fixing of exciter
The exciter should be rigidly fixed at or near the peak of the main frequency and its vibration model. The fixing place should be flat: 62.3 Fixing of vibrator
JB/T10375—2002
The detector should be fixed at or near the sensitive amplitude of the vibration model away from the exciter and can be reflected. Its direction should be consistent with the vibration direction. 5.3 Indirect vibration
For components that cannot be directly vibrated, frequency reduction measures should be taken. The main frequency reduction measures include: total series connection and combination methods: 5.3.1 Vibration
To reduce the end of the component to minimize the perturbation, the exciter is placed at the same end as the method of handling. 6.3.2 Combined vibration
Combined vibration is to combine two or more rigid vibration devices in parallel along the vertical direction to form a new vibration system, and perform vibration processing on this system. The arrangement of support points, exciters and pickups is the same as that of combined vibration. 5.3.3 Combined vibration
Combined vibration is to install two components on the vibration platform, determine the support points according to the platform, and make vibration points and mounting points. 5.4 Vibration test of components
5.4.1 General
When carrying out vibration aging of welded components made of different materials, an assessment of similar materials and processes shall be carried out first: welded components that exceed the specified value or structural design shall not be allowed to undergo vibration aging treatment. 5.4.2 Exciter eccentricity setting
The selection of the correct position of the micro-vibrator shall be sufficient to ensure that the component produces an appropriate amplitude. The load generated by the device does not exceed 70% of the specified load. 5.4.3 Direction of dynamic stress
When carrying out vibration aging, the direction of dynamic stress shall be the same as or close to the direction of the maximum stress of the main weld of the component. 5.4.4 Natural frequency
1 The natural frequency of a component can be obtained by the full strength scanning method or by the independent frequency division method. After finding the processing frequency, start vibrating the workpiece at the frequency corresponding to 1/323 of the vibration reduction value in the industry area: when the main frequency is determined according to the vibration, the main frequency point, the main frequency point and the main frequency point should be adjusted.
When using the frequency analysis method, the exciter can be used to perform mathematical operations on the workpiece to obtain the workpiece's functional frequency, and automatically select the most suitable frequency group under the condition of the efficiency. 5.4.5 Dynamic stress
The minimum value of dynamic stress should reach the best working stress of -2.The dynamic force can be estimated according to the following formula:
With stress modulus
9.—Material pressure resistance
—Material stress resistance
The dynamic stress amplitude control is related to the stress of the component. When the component geometry is uniform and the joint concentration coefficient is small: the dynamic force can take the upper resistance value (/3): When the component geometry is uneven, the joint stress concentration coefficient is large: the dynamic stress can take the lower limit value (0,-0,) 13.
5.4.6 Vibration time
Under normal circumstances, the vibration aging of welded components is formed in the following three stages: a! Initial stage (about 2min-3min): the main parameters change very quickly, and the residual stress of the parts changes very quickly:
5) Intermediate stage: the change of integral stress slows down: c) The final stage (about 2min~3min), the parameters and residual stress basically have no change, 3
T/T10375-2002
According to the law and characteristics of vibration aging of welding parts, the vibration aging time is generally controlled at 10min-15min. Liu Shi measured the components with large and complex structures, and the time required for vibration aging is relatively long. 5.5 Structural vibration effect
To make the structure of the disturbance aging product according to the predetermined number of white models, and print the following lines online or at the end of the product: a) The first 4-curve:
b! When it is necessary to read more prices, the number of dirty lines should be printed out: the source of the line
For complex welding parts with high degree of difficulty, drilling and disassembly, you can consider doing multiple times, but the accumulation of time shall not start 45mⅡ: The welding technology or welding parts can be held for ten months. Specific: The process documents of the aging period of the operation should be maintained in accordance with the actual conditions.
When the aging period of the control panel is exceeded, the technical personnel should issue a report on the aging period of the operation. If the operator completes the rescue operation, the operation record card of the cabinet should be filled in in time. The vibration aging process should be managed in accordance with relevant regulations. File: G vibration aging effect evaluation method
6.1 Parameters from reverse observation method
can be based on the real-time printout of the internal data in the vibration aging process and the changes before and after vibration to judge the actual effect of vibration aging. If one of the following conditions is found, the vibration aging effect can be determined: 1) a line rises and then becomes flat; 2) a line rises and then falls; 3) a line rises and then falls; 4) a line rises and then falls; 5) a line rises and then falls; 6) a line rises and then falls; 7) a line rises and then falls; 8) a line rises and then falls; 9) a line rises and then falls; 10) a line rises and then falls; 11) a line rises and then falls; 12) a line rises and then falls; 13) a line rises and then falls; 14) a line rises and then falls; 15) a line rises and then falls; 16) a line rises and then falls; 17) a line rises and then falls; 18) a line rises and then falls; 19) a line rises and then falls; 20) a line rises and then falls; 21) a line rises and then falls; 22) a line rises and then falls; 23) a line rises and then falls; 24) a line rises and then falls; 25) a line rises and then falls; 26) a line rises and then falls; 27) a line rises and then falls; 28) a line rises and then falls; 29) a line rises and then falls; 30) a line rises and then falls; 31) a line rises and then falls; 32) a line rises and then falls; 33) a line rises and then falls; 34) a line rises and then falls; 35) a line rises and then falls According to the rise, translation, and left shift, there are many: d2 well line after moving to the city smooth:) a curve after the fall of the phenomenon of the increase of the data, .2 actual method
6.2.1 residual stress scratch test method
It is recommended to use the straight hole loose method, you can also use the × age derivative light method or the credit magnetic method when the conditions are met: when using the training method, the material quality at the test point should be large pinhole diameter, each component can be selected two to three times each welding. Each main chain of the visual test point shall not be more than ten. The test point should be arranged at the center of the welding or the root of the chain. .
Use the stress before and after the test to calculate the stress reduction rate. The reduction rate should be greater than 0%. Use the maximum and minimum stress squares after the vibration to balance the stress uniformity. The calculated value after the vibration should be less than the calculated value before the vibration. The maximum and minimum stresses should be based on the main stress square virtual longitudinal stress of the weld. 6.2.2 Dimensional stability
For the welded components that are subjected to vibration aging treatment with dimensional compensation as the main factor, the vibration thickness should be measured. The following methods can be used to test the size:
) Vibration number size b) Dimension test after processing:
) Long-term storage, regular size test: do the first test after 15 people are placed, do the first test after 30 days of storage, and then do one test every 30 days. The total storage time is more than one year.) Test under dynamic load (the specific time interval refers to the above items: All test results shall meet the requirements, 4
A, 1 Vibration aging of other types of jointed structures Appendix A
Informative Appendix
Application instructions for dynamic aging process|| tt||JB/T10375—2002
Although this standard limits the applicable scope of vibration aging, other types of table tops or structures (such as: needle loss expansion welding of matching joints) can also be subjected to vibration aging treatment in accordance with the provisions of this standard. A.2 Stress concentration factor of welded joints
Welded structures that use vibration aging technology should use joint types with appropriate product coefficients, and the stress concentration effect in the frame should not be too large. 2.8 Welding with obvious stress concentration, such as spot welding, close welding, butt welding and For welded components other than full penetration welding, the stress concentration factor should be increased to limit the maximum dynamic stress amplitude. A.3 Operating characteristics of components
The vibration aging process does not change the dynamic energy of the material. For welded components with strong resistance requirements, dynamic aging should not be used as the most comprehensive aging process.
A4 Combination of vibration aging and other processes
For welded components with a long service life and significant influence on the quality of the line, when vibration aging cannot fully meet the requirements, dynamic aging can be used as a composite process. :: Vibration aging with vibration:
) Vibration aging - thermal aging:
) Vibration aging - continuous impact or continuous ultrasonic impact, A.5 Vibration correction of components
The components with excessive deformation are checked and diagnosed to the level of the damage layer for dynamic effect, special cleaning and repeated examination of short-term dynamic correction of prestressed or auxiliary welding components, etc. After forced shaping or deformation, the impact components are all subjected to perturbation aging treatment, in order to increase the material deformation rate of the same part and reduce the welding setting process, its unique application The agreement of force and reverse deformation should take into account the inevitable elastic return after the dynamic process results in stress or subsequent removal of the joint tooling. And the local tension sequence will give the component market demand.
A.6 Process evaluation of vibration aging
The vibration aging process evaluation is sufficient for the vibration aging process 1. According to the heavy welding structure and the average production of the parts, the vibration aging process is established according to the standard, and the quality assurance inspection and inspection measures are established. The relevant technical documents are used to complete the dynamic aging process.
The main requirements of the dynamic aging process are: the specifications and models of the dynamic aging equipment suitable for the parts, the dynamic process data, the actual center and the internal specifications, the location of the measuring points, the direction of prohibition, the technical requirements, the sampling items and the proportion of the inspection.1. The parameters are measured in real time by the reverse method. The actual effect of vibration aging can be determined according to the changes before and after vibration in the process of vibration aging. If one of the following conditions is found, the vibration aging effect can be determined. 2. A line rises and then becomes flat: 3. A line rises and then falls. 4. A curve after vibration has undergone changes in single or combined characteristics (such as rise, fall, left shift, etc.): 5. The curve becomes simple and smooth after moving: After the test, the amplitude of the test is increased. 2.2.1 Residual stress test method
It is recommended to use the straight hole method, and the ×-age derivative method or the magnetic method can be used when conditions permit: When the test is carried out by the test method, the material quality at the test point should be greater than the diameter of the pinhole. Two to three welds can be selected for each component. Each main chain of the visual test point shall not be more than ten. The test point should be arranged at the center of the weld or the root of the chain.
The stress reduction rate is calculated by the average value of the stress before and after the test. The reduction rate Should be greater than 0%, the maximum and minimum stress square difference after vibration is used to balance the uniformity of the stress, the calculated value after perturbation should be less than the calculated value before vibration, the maximum and minimum stress rounds should be based on the main stress square virtual longitudinal stress of the weld, 6.2.2 Dimensional stability test
The welded components that are subjected to vibration aging treatment with dimensional compensation as the main month are subjected to dimensional measurement after vibration thickness. The following methods can be used to test the dimensions:
) Vibration dimensional measurement or:
b) Dimensional test after processing:
|) Long-term release, regular small test: do the first test after 15 people are placed, do the first test after 30 days of release, and then do one test every 30 days. The total release time is more than 1 year.) Test under dynamic load (the specific time interval refers to the above items: All test results should meet the requirements, 4
A, 1 Vibration aging of other types of jointed structures Appendix A
Informative Appendix
Application instructions for dynamic aging process
JB/T10375—2002| |tt||Although this standard limits the applicable scope of vibration aging, other types of desk or structure (such as: the needle loss expansion welding of the joint of the joint) can also be subjected to vibration aging treatment in accordance with the provisions of this standard. A.2 Stress concentration factor of welded joints
Welded structures that use vibration aging technology should use joint types with appropriate product coefficients, and the stress concentration of the structure should not be too large. 2.8 Welding with obvious stress concentration, such as spot welding, close welding, butt welding and non-penetration welding, should be used for welding components. Stress concentration system increases the multiple to limit the maximum dynamic stress amplitude A.3 Operation characteristics of components
The vibration aging process does not change the dynamic energy of the material plastic parts. For the welded components with resistance requirements, it is not recommended to use the dynamic aging process as the most comprehensive aging process.
A4 Combination of vibration aging and other processes
For welded components with a long period of time and the influence of the line stress on the quality of the work, when the vibration aging process cannot fully meet the requirements, the vibration aging process can be used as a composite process: Effect:
) Vibration aging - Heat aging: www.bzxz.net
) Vibration aging - Continuous impact or ultrasonic impact, A.5 Vibration correction of components
Components with excessive deformation are checked and diagnosed to the level of the damage layer for original dynamic effect, special cleaning and repeated examination of short dynamic correction of prestressed or assisted welding components. After forced shaping or deformation, the impact components are all treated with perturbation aging treatment, in order to increase the material deformation rate of the same part and reduce the welding setting. A process, its unique stress and reverse deformation The agreed quantity should take into account the inevitable elastic return of the dynamic process stress or the subsequent removal of the joint tooling. And the local tension sequence to the component market demand.
A.6 Vibration aging process evaluation
Vibration aging process evaluation 1. According to the heavy welding structure and the average production parts, the dynamic aging process should be based on the standard to establish the correct vibration aging process, quality assurance inspection and related technical documents to ensure the inspection measures, including the completion of the dynamic aging process system.
The dynamic aging process requirements include: the specifications and models of the dynamic aging equipment suitable for the component, the dynamic process data, the actual center and content, the location of the measuring point, the direction, the technology, the sampling items and the inspection ratio, etc.1. The parameters are measured in real time by the reverse method. The actual effect of vibration aging can be determined according to the changes before and after vibration in the process of vibration aging. If one of the following conditions is found, the vibration aging effect can be determined. 2. A line rises and then becomes flat: 3. A line rises and then falls. 4. A curve after vibration has undergone changes in single or combined characteristics (such as rise, fall, left shift, etc.): 5. The curve becomes simple and smooth after moving: After the test, the amplitude of the test is increased. 2.2.1 Residual stress test method
It is recommended to use the straight hole method, and the ×-age derivative method or the magnetic method can be used when conditions permit: When the test is carried out by the test method, the material quality at the test point should be greater than the diameter of the pinhole. Two to three welds can be selected for each component. Each main chain of the visual test point shall not be more than ten. The test point should be arranged at the center of the weld or the root of the chain.
The stress reduction rate is calculated by the average value of the stress before and after the test. The reduction rate Should be greater than 0%, the maximum and minimum stress square difference after vibration is used to balance the uniformity of the stress, the calculated value after perturbation should be less than the calculated value before vibration, the maximum and minimum stress rounds should be based on the main stress square virtual longitudinal stress of the weld, 6.2.2 Dimensional stability test
The welded components that are subjected to vibration aging treatment with dimensional compensation as the main month are subjected to dimensional measurement after vibration thickness. The following methods can be used to test the dimensions:
) Vibration dimensional measurement or:
b) Dimensional test after processing:
|) Long-term release, regular small test: do the first test after 15 people are placed, do the first test after 30 days of release, and then do one test every 30 days. The total release time is more than 1 year.) Test under dynamic load (the specific time interval refers to the above items: All test results should meet the requirements, 4
A, 1 Vibration aging of other types of jointed structures Appendix A
Informative Appendix
Application instructions for dynamic aging process
JB/T10375—2002| |tt||Although this standard limits the applicable scope of vibration aging, other types of desk or structure (such as: the needle loss expansion welding of the joint of the joint) can also be subjected to vibration aging treatment in accordance with the provisions of this standard. A.2 Stress concentration factor of welded joints
Welded structures that use vibration aging technology should use joint types with appropriate product coefficients, and the stress concentration of the structure should not be too large. 2.8 Welding with obvious stress concentration, such as spot welding, close welding, butt welding and non-penetration welding, should be used for welding components. Stress concentration system increases the multiple to limit the maximum dynamic stress amplitude A.3 Operation characteristics of components
The vibration aging process does not change the dynamic energy of the material plastic parts. For the welded components with resistance requirements, it is not recommended to use the dynamic aging process as the most comprehensive aging process.
A4 Combination of vibration aging and other processes
For welded components with a long period of time and the influence of the line stress on the quality of the work, when the vibration aging process cannot fully meet the requirements, the vibration aging process can be used as a composite process: Effect:
) Vibration aging - Heat aging:
) Vibration aging - Continuous impact or ultrasonic impact, A.5 Vibration correction of components
Components with excessive deformation are checked and diagnosed to the level of the damage layer for original dynamic effect, special cleaning and repeated examination of short dynamic correction of prestressed or assisted welding components. After forced shaping or deformation, the impact components are all treated with perturbation aging treatment, in order to increase the material deformation rate of the same part and reduce the welding setting. A process, its unique stress and reverse deformation The agreed quantity should take into account the inevitable elastic return of the dynamic process stress or the subsequent removal of the joint tooling. And the local tension sequence to the component market demand.
A.6 Vibration aging process evaluation
Vibration aging process evaluation 1. According to the heavy welding structure and the average production parts, the dynamic aging process should be based on the standard to establish the correct vibration aging process, quality assurance inspection and related technical documents to ensure the inspection measures, including the completion of the dynamic aging process system.
The dynamic aging process requirements include: the specifications and models of the dynamic aging equipment suitable for the component, the dynamic process data, the actual center and content, the location of the measuring point, the direction, the technology, the sampling items and the inspection ratio, etc.
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