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GB/T 24610.2-2019 English PDF (GBT24610.2-2019)

GB/T 24610.2-2019 English PDF (GBT24610.2-2019)

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GB/T 24610.2-2019: Rolling bearings -- Measuring methods for vibration -- Part 2: Radial ball bearings with cylindrical bore and outside surface

GB/T 24610.2-2019
Rolling bearings--Measuring methods for vibration--Part 2. Radial ball bearings with cylindrical bore and outside surface ICS 21.100.20
J11
National Standards of People's Republic of China
Replaces GB/T 24610.2-2009
Method for measuring vibration of rolling bearings
Part 2. Cylindrical holes and cylindrical outer surfaces
Radial ball bearing
Part 2. Radialbalbearingswithcylindricalboreandoutsidesurface
(ISO 15242-2..2015, IDT)
Published on October 18,.2019
2020-05-01 implementation
State Administration of Market Supervision
Published by China National Standardization Administration
Contents
Foreword I
Introduction Ⅱ
1 range 1
2 Normative references 1
3 Terms and definitions 1
4 Measurement procedure 1
4.1 Rotation frequency 1
4.2 Bearing axial load 1
5 Measurement and evaluation methods 2
5.1 Measured physical quantities 2
5.2 Frequency domain 2
5.3 Pulse and sharp pulse measurement 3
5.4 Test 3
6 Measurement conditions 3
6.1 Bearing measurement conditions 3
6.2 Test environmental conditions 3
6.3 Measuring device conditions 4
Appendix A (Normative Appendix) Measurement of Accuracy of Axial Load Axis Alignment 7 Foreword
GB/T 24610 "Measurement method for rolling bearing vibration" is divided into 4 parts. --- Part 1. Basics;
--- Part 2. Radial ball bearings with cylindrical holes and cylindrical outer surfaces; --- Part 3. Spherical roller bearings and tapered roller bearings with cylindrical bore and cylindrical outer surface; --- Part 4. Cylindrical roller bearings with cylindrical bore and cylindrical outer surface. This part is the second part of GB/T 24610.
This section is drafted in accordance with the rules given in GB/T 1.1-2009. This section replaces GB/T 24610.2-2009 "Method for measuring vibration of rolling bearings-Part 2. With cylindrical holes and cylindrical appearance Surface radial ball bearings ', compared with GB/T 24610.2-2009, the main technical changes are as follows. --- Revised the partial expression of "rotation frequency" (see 4.1, 4.1 of.2009 version); --- Modified the symbolic expression of "root mean square vibration velocity" (see 5.1, 5.1 of.2009 version); --- Added "Example of frequency range of non-set rotation frequency" table (see Table 3); --- Modified some graphics and added description of the figure (see Figure 2, Figure 3, Figure A.1, Figure 2, Figure 3, Figure A.1 of the.2009 edition) --- Deleted "bearing cleanliness, lubrication, and operator requirements" (see 6.1.2, 6.1.3, 6.4 of the.2009 edition); --- Increased the requirement for "non-prelubricated bearings" (see 6.1.2). This section uses the translation method equivalent to ISO 15242-2..2015, "Rolling bearing vibration measurement methods Part 2. With cylindrical holes And radial ball bearings on the outer surface of a cylinder.
The Chinese documents that have a consistent correspondence with the international documents referenced normatively in this section are as follows. --- GB/T 1800.2-2009 Geometrical Product Specifications (GPS) Limits and Fits Part 2. Standard Tolerance Grades and Hole and shaft limit deviation table (ISO 286-2. 1988, MOD)
--- GB/T 2298-2010 Vocabulary for mechanical vibration, shock and condition monitoring (ISO 2041..2009, IDT) --- GB/T 6930-2002 Vocabulary for rolling bearings (ISO 5593..1997, IDT) --- GB/T 24610.1-2019 Rolling bearing vibration measurement method Part 1. Basics (ISO 15242-1..2015, IDT) This section is proposed by China Machinery Industry Federation.
This part is under the jurisdiction of the National Rolling Bearing Standardization Technical Committee (SAC/TC98). This section was drafted. Hangzhou Bearing Test Research Center Co., Ltd., Luoyang Bearing Research Institute Co., Ltd., Baota Industrial Co., Ltd. Company, Cixing Group Co., Ltd., Huanchi Bearing Group Co., Ltd., Zhejiang Wuzhou Xinchun Group Co., Ltd., Chongqing Changjiang Bearing Co., Ltd. Co., Ltd., Fujian Yong'an Bearing Co., Ltd., Zhejiang Xinchang New Shaft Industry Co., Ltd., Zhejiang Meiyate Precision Machinery Co., Ltd. Division, Zhejiang Huanyu Bearing Co., Ltd., Dalian Baishengyuan Technology Co., Ltd. The main drafters of this section. Cao Maolai, Li Xinglin, Li Feixue, Li Hongbin, Zhao Kun, Chen Yinjun, Zhang Xunlei, Zhao Xingxin, Qian Weihua, Pang Qixing, Zhou Youhua, Luo Qing, Hou Yongqiang, Chang Zhen, Lu Shuigen.
The previous versions of the standards replaced by this section are.
--- GB/T 24610.2-2009.
introduction
The vibration of a rolling bearing is an important operating characteristic. Vibration will affect the performance of the mechanical system with bearings. It can cause audible noise when propagating to the environment where the operating mechanical system is located, which can lead to system damage and even health problems. The vibration of a rolling bearing during rotation is a complex physical phenomenon related to the operating conditions. Single set of shafts measured under a set of conditions The bearing vibration value does not necessarily represent the vibration value under different conditions or when the bearing becomes a part of a larger component. Assessed The sound generated by the mechanical system of the bearing is more complicated.It is also affected by the interface conditions, the position and orientation of the sensing device, and the sound of the system. Impact of the learning environment. Air noise-GB/T 24610 (all parts) is defined as any unpleasant, undesired sound. Because the term "unpleasant, undesired" is subjective, its evaluation is more complicated. It can be considered that the structural vibration of the bearing is Eventually the driving source for air noise. GB/T 24610 (all parts) only includes vibration measurement of selected bearing structures method.
Bearing vibration can be evaluated using any of a number of methods, with different evaluation methods using different types of sensors and test conditions. No set of values characterizing bearing vibrations can evaluate bearing vibration performance under all possible conditions of use. Eventually, also It should be based on known bearing types, conditions of use, and vibration testing purposes (e.g. To choose the most suitable test method. Therefore, the scope of application of bearing vibration standards is not universal. But for the purposes of this section, Only certain methods with a very broad scope are established as standard methods. This section specifies the method for assessing the vibration of a radial ball bearing with a cylindrical bore and a cylindrical outer surface on a test device. Method for measuring vibration of rolling bearings
Part 2. Cylindrical holes and cylindrical outer surfaces
Radial ball bearing
1 Scope
This part of GB/T 24610 specifies single-row and double-row radial ball bearings with contact angles not greater than 45 ° under the established test conditions. Method of vibration measurement.
This section applies to radial ball bearings with cylindrical bore and cylindrical outer surface. This section does not apply to bearings with filling grooves and three-point, four-point contact ball bearings. 2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. ISO 286-2 Geometric Product Specifications (GPS) Linear Dimensional Tolerance ISO Code System Part 2. Standard Tolerance Classes and Hole and shaft limit deviation table [Geometricalproductspecifications (GPS) -ISO codesystemfortorleranceson linearsizes-Part 2. Tables ofstandardtolerancegradesandlimitdeviationsforholesandshafts] ISO 2041..2009 Vocabulary for mechanical vibration, shock and condition monitoring (Mechanicalvibration, shockandcondition monitoring-Vocabulary)
ISO 5593 rolling bearing vocabulary (Rolingbearings-Vocabulary)
ISO 15242-1..2015 Rolling bearing vibration measurement methods-Part 1. Basics (Rolingbearings-Measuring methodsforvibration-Part 1. Fundamentals)
3 terms and definitions
The terms and definitions defined in ISO 2041, ISO 5593 and ISO 15242-1 apply to this document. 4 Measurement procedure
4.1 Rotation frequency
The setting value of the rotation frequency is 1800min-1 (30s-1), and the deviation is 1-2% of the nominal rotation frequency. After negotiation between the manufacturer and the user, other rotation frequencies and deviations can also be used. For example, for bearings with smaller dimensions, High rotation frequency (such as 3600min-1) in order to obtain a suitable vibration signal. Conversely, for bearings with larger dimensions, Low rotation frequency (such as 700min-1) to avoid possible damage to balls and raceways. 4.2 Bearing axial load
The axial load shall be applied to the bearing. The set values are specified in Table 1. Table 1 Setting values of bearing axial load
Bearing outer diameter
Single-row and double-row deep groove harmony
Radial ball bearings
Single-row and double-row angular contact centripetal uranium bearing
10 ° < contact angle≤23 ° 23 ° < contact angle≤45 °
> ≤
Set value of axial load
min.max.min.max.min.max.
mm NNN
10 25 18 22 27 33 36 44
25 50 63 77 90 110 126 154
50 100 135 165 203 247 270 330
100 140 360 440 540 660 720 880
140 170 585 715 878 1072 1170 1430
170.200 810 990 1215 1485 1620 1980
After the manufacturer negotiates with the user, other axial loads and deviations can also be used. For example, depending on the bearing structure, rotation frequency, and used Lubricant, you can use a higher load to prevent the ball and the raceway from slipping; or a lower load to avoid the possibility of the ball and the raceway Damage.
5 Measurement and evaluation methods
5.1 Measured physical quantities
The physical quantity set during the measurement is the radial root mean square vibration velocity, vrms (μm/s). 5.2 Frequency domain
The vibration speed should be analyzed in one or more frequency bands, within the set frequency range specified in Table 2. Table 2 Setting frequency range of rotation frequency 1800min-1
Rotating frequency Low frequency band (L) Mid frequency band (M) High frequency band (H) min.max.
Nominal frequency band
flow fupp flow fupp flow fupp
min-1 Hz Hz Hz
1764 1818 50 300 300 1800 1800 10000
If a specific frequency range is extremely important for the good operation of the bearing, other parameters can also be used after consultation between the manufacturer and the user. Frequency range, see Table 3 for examples of commonly used specific frequency ranges. The rotation frequency should be changed according to the proportional change of the filter frequency, the acceptable limit and the minimum measurement time. See Table 3 for an example. Table 3 Example of frequency range without set rotation frequency
Rotating frequency Low frequency band (L) Mid frequency band (M) High frequency band (H) Nominal min.max.
Nominal frequency band
flow fupp flow fupp flow fupp
min-1 Hz Hz Hz
3600 3528 3636 100 600 600 3600 3600.20000
900 882 909 25 150 150 900 900 5000
700a 686 707 20 120 120 700 700 4000
a When the rotation frequency is 700min-1, the cut-off frequency is rounded (the relationship between the rotation frequency and the rotation frequency is not strictly followed). Narrow-band spectral analysis of vibration signals is available as a complementary option. 5.3 Pulse and sharp pulse measurements
Surface defects and/or contamination in the tested bearings often cause pulses or sharp pulses of the time domain velocity signal. Detection of sharp pulses is a complementary option. Different assessment methods can be used. 5.4 Test
Except for single-row angular contact ball bearings, all bearings should be tested with an axial load on one side of the stationary ferrule, then Repeat the test by applying an axial load on the other side. Single-row angular contact ball bearings should be tested only in their predicted axial load direction. The maximum vibration indication for each frequency band should be within the limits. When used for diagnostic analysis, multi-point measurements should be made at different angular positions of the bearing stationary ferrule relative to the sensor. Test duration According to ISO 15242-1..2015 6.5.
6 Measurement conditions
6.1 Bearing measurement conditions
6.1.1 Pre-lubricated bearings
Pre-lubricated (grease-lubricated, oil-lubricated or solid-lubricated) bearings, including sealed bearings and dust-proof bearings, should be tested under delivery. 6.1.2 Non-prelubricated bearings
Because the pollutants affect the vibration level, the bearings should be effectively cleaned, taking care not to introduce pollutants or other sources of vibration. Note. Some rust inhibitors can meet the lubrication requirements of vibration test. It is not necessary to remove the rust inhibitor at this time. Non-prelubricated bearings should use a nominal kinematic viscosity between 10mm2/s ~ 100mm2/s and be fine- Filtered oil is fully lubricated.
During the lubrication process, a trial operation should be performed to make the lubricant in the bearing evenly distributed. 6.2 Test environmental conditions
Bearings should be tested in an environment that does not affect vibration. 6.3 Measuring device conditions
6.3.1 Stiffness of spindle/mandrel
The structure used to support and drive the main shaft (including the mandrel) of the bearing can not only transmit rotary motion, but also serve as rigidity of the rotation axis. Sexual frame of reference. In the frequency band used, the transmission of vibration between the spindle/mandrel and the bearing can be ignored compared to the measured vibration speed. Negligible.
6.3.2 Loading mechanism
The structure of the loading mechanism used to apply a load to the bearing's measured ferrule should make the ferrule in all directions-radial, axial, angular or flex The vibration of the curved type (depending on the type of bearing) is essentially in a free vibration state, and can guarantee the normal operation of the bearing. 6.3.3 Bearing load and alignment accuracy
The magnitude of the constant applied axial load applied to the bearing stationary ring is specified in 4.2. The deformation of the bearing ring due to the contact of various mechanical parts is negligible compared with the geometric accuracy of the tested bearing itself. The position and direction of the applied load should coincide with the axis of rotation of the main shaft, and its deviation should be within the range specified in Figure 1 and Table 4. Measuring party Act in accordance with the provisions of Appendix A.
a Axis of applied load.
b Rotation axis of bearing inner ring.
c Radial and angular deviations of the applied load axis from the rotation axis of the bearing inner ring (see Table 4). Figure 1 Deviation of the load axis relative to the rotation axis of the bearing inner ring Table 4 Deviation of the load axis relative to the rotation axis of the bearing inner ring Bearing outer diameter
> ≤
Radial deviation from the rotation axis of the bearing inner ring
max.
Angle deviation from the rotation axis of the bearing inner ring
max.
mm mm (°)
10 25 0.2
25 50 0.4
50 100 0.8
100 140 1.6
140 170 2.0
170.200 2.5
0.5
6.3.4 Axial position and measurement direction of the sensor
The positioning of the sensors is as follows.
Set axial position. on the outer surface of the stationary ferrule and on the plane corresponding to the middle of the loaded stationary ferrule raceway in contact with the ball (for The stationary outer ring, see Figure 2), the bearing manufacturer should provide this data. Explanation.
a --- Sensor position and orientation.
b --- Axial load direction.
Figure 2 Vibration measurement --- the position set by the sensor
Another position (except for deep groove ball bearings). located at the center of the width of the stationary ferrule, see Figure 3 (this measurement point position may vary Vibration signal).
Explanation.
a --- Sensor position and orientation.
b --- Axial load direction.
Figure 3 Vibration measurement --- the location of another sensor measurement point After the position of the sensor is determined, the maximum allowable axial position deviation is. --- When outer diameter D≤70mm. ± 0.5mm;
--- When outer diameter D> 70mm. ± 1.0mm.
Direction. perpendicular to the axis of rotation (see Figure 4). The deviation from the radial centerline in any direction should not exceed 5 °. a In any direction.
Figure 4 Deviation from radial centerline
6.3.5 Mandrel
The outer diameter tolerance of the cylindrical surface of the mandrel used to install the bearing inner ring shall meet the requirements of class f5 in ISO 286-2 The geometric error ensures that the mandrel is inserted into the bearing bore with a slip fit. The radial and axial runout should be controlled so as not to affect the test. Runout shall be performed using the device given in Appendix C of ISO 15242-1..2015. Line measurement.
Appendix A
(Normative appendix)
Measurement of axis alignment accuracy with applied axial load
The offset of the loading mechanism is measured using two dial gauges mounted on the bracket of the spindle (see Figure A.1). The axial distance is a certain distance. The main shaft should rotate slowly, and the dial gauge can measure the radial runout of the loading piston. The radial runout measured by the two dial gauges should be corrected according to the axial position of the test bearing so that it can meet the limits specified in Table 4. The deviation values are compared.
Explanation.
1, 2 --- dial indicator;
3 --- mounting bracket for dial indicator;
4 --- mandrel;
5 --- loading mechanism.
Figure A.1 Measurement of centering accuracy with applied axial load

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