This standard specifies the method of measuring the radius change with a contact instrument to determine the error of the bearing parts at the specified position and the error evaluation method. This standard is applicable to the measurement and evaluation of the roundness and waviness errors of various types of rolling bearing finished parts with a diameter of 3mm~350mm. JB/T 6642-2004 Method for measuring and evaluating the roundness and waviness errors of rolling bearing parts JB/T6642-2004 Standard download decompression password: www.bzxz.net

ICS21.100.20
J11
JB
Machinery Industry Standard of the People's Republic of China
JB/T6642--2004
replaces JB/T6642-1993|| tt||Rolling bearing parts
Rolling bearing parts Methods for the measurement and assessment ofdeparturefromroundnessandwaviness2004-02-10 Released
Implemented on 2004-06-1||tt| |Foreword issued by the National Development and Reform Commission of the People's Republic of China
Scope
Normative reference documents
Terms and definitions
Measurement requirements
4.1||tt ||Instrument
4.2 contacts
5 bearing parts measurement
5.1
5.2
6
Measurement location and direction||tt ||Positioning adjustment
Error assessment method
Assessment center
6.1
Assessment of steel ball roundness and waviness error
6.2||tt| |Assessment result output
6.3
6.4
Assessment code
item
times
IB/T6642—2004
T
+.
Foreword
This standard replaces JB/T6642-1993 "Measurement and Evaluation Method of Roundness Error of Rolling Bearing Parts". Compared with JB/T6642-1993, this standard mainly The changes are as follows: Modified the standard name:
Added the definition of waviness (see 3.1 of this edition): Specified the frequency response range of waviness (see 4.1.3 of this edition): JB/T6642—2004||tt ||Specifies the sampling rate and digital filtering characteristics for computer calculation of roundness and waviness (see 4.14 of this edition): adds technical requirements for computer calculation of wave number (see 4.1.5 of this edition): specifies two types of waviness Assessment method (see 6.1.2 of this edition); Added requirements for output of assessment results (see 6.3 of this edition): Added waviness assessment code (see 6.4.2 of this edition) This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Rolling Bearing Standardization Technical Committee (CSBTS/TC98). This standard was drafted by: Luoyang Bearing Research Institute. The main drafter of this standard: Zhong Xiaobin.
The previous versions of the standard replaced by this standard are: JB/T6642-1993.
1 Scope
JB/T6642—2004
Measurement and evaluation method of roundness and waviness error of rolling bearing parts. This standard specifies the use of contact instruments to measure the radius change to determine the bearing parts. Methods for roundness and waviness errors at specified locations and error assessment methods.
This standard is applicable to the measurement and evaluation of roundness and waviness errors of various types of rolling bearing finished parts with a diameter of 3mm to 350mm 2 Normative reference documents
The terms in the following documents are incorporated by reference in this standard terms of this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. . For undated referenced documents, the latest edition applies to this standard. GB/T7234-1987 Roundness measurement terms, definitions and parameters (eqvISO6318:1985) GB/T7235-1987 Methods for evaluating roundness error Radius variation measurement (neqISO4291:1985) 3 terms and definitions
GB/T7234 --The terms and definitions established in 1987 and the following apply to this standard. Waviness
In the wave spectrum of the roundness measurement display profile, the peak and valley amplitude of the wave number set in a range higher than the roundness wave number is the waviness. 4 Measurement requirements
4.1 Instrument
4.1.1 Measuring instrument type
The instrument can be a sensor rotating type or a table rotating type. 4.1.2 Measurement result output mode
The measurement result output can be graphic recording or parameter direct display. The same instrument can have one or both of the above output modes. 4.1.3 Frequency response
The frequency response range during roundness measurement is 2 wavenumbers/revolution, 15 wavenumbers/revolution and 2 wavenumbers/revolution ~ 50 wavenumbers/revolution. The filter passband is attenuated by 3dB. This standard recommends using a frequency response range of 2 wavenumbers/revolution to 15 wavenumbers/revolution to measure roundness. The frequency response range during waviness measurement is 15 wavenumbers/revolution to 150 wavenumbers/revolution and 15 wavenumbers/revolution to 250 wavenumbers/revolution, and the filter passband table is reduced by 3dB. This standard specifies the use of a frequency response range of 15 waves/revolution to 150 waves/revolution to measure the waviness of steel balls (rollers) and inner grooves (raceways): a frequency response range of 15 waves/revolution to 250 waves/revolution. Measure the waviness of the outer groove (raceway). The roundness and waviness frequency response ranges are shown in Figure 1. 4.1.4 Sampling frequency and digital filtering characteristics
When using a computer system to calculate roundness and waviness, the actual number of contour samples should be greater than 1,000 points and evenly distributed. Digital filtering characteristics should comply with the provisions of 4.1.3 of this standard. 4.1.5 Wave spectrum
The roundness and waviness measurement system using a computer system should be able to calculate the number and amplitude of the sine waves of roundness and waviness, and be able to display or print at least the five largest amplitudes among them. The amplitude of the sine wave. 4.2 Contacts
4.2.1 Contact materials
JB/T6642—2004
System
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50| | tt | .2 Contact static pressure
should be selected within 0.02N~1.2N according to the size and shape of the test parts. Knock count rotation
4.2.3 Contact shape
There are spherical or raised shapes (see Figure 2 and Figure 3). The probe radius r and R are selected according to the regulations of GB/T7235-1987 | |tt||5 Bearing parts measurement
5.1 Measurement location and direction
5.1.1 Set of grooves
Measure the deep groove ball bearing ring in the normal section at the bottom of the groove (see Figure 4) Angular direction measurement (see Figure 5).
Figure 4
Figure 3
Angular contact ball bearing rings are in contact along the approximate design contact angle Figure 5
5.1.2 Ring raceway||tt ||Roller bearings are measured at half the width of the raceway of the ring and in the direction perpendicular to the raceway cable line (see Figure 6) Figure 6
5.1.3 Steel Ball
Measured on two mutually perpendicular equatorial planes passing through the center of the ball (see Figure 7) steel ball
Figure 7
5.1.4 roller
JB/T66422004||tt ||Measured at half the length of the roller (at maximum diameter for asymmetric spherical rollers), perpendicular to the direction of the roller cable. 5.2 Positioning adjustment
5.2.1 Part installation and instrument adjustment
The axis of the part being measured should be parallel to the rotation axis of the instrument, and the instrument should be adjusted so that the axis of the measured section is coaxial with the rotation axis of the main shaft of the instrument. 5.2.2 Graphic record
The track wheels should be distributed around the average radius circle of the contour graphic. 5.2.3 Eccentricity control
For general precision measurement, the eccentricity should not exceed 15% of the average radius of the wheel rate pattern, and for high-precision measurement, it should not exceed 7%. 6 Error Assessment Method
6.1 Assessment Center
6.1.1 Degree Error Assessment Center
The difference between the maximum radius and the minimum radius is used to determine the roundness error of the measured section.
a) Minimum area circle center (see Figure 8)
M2C diagram benefit
A2,=0.62μm
Min Da times
X40000| | tt |2 Waviness error evaluation center
This standard stipulates that the waviness error of the measured section is determined by the difference between the maximum radius and the minimum radius of the contour of the measured part derived from the center of any of the following circles (the center of the evaluation reference circle).
JB/T6642—2004
a) Minimum area circle center (see Figure 10)
b) Least square circle center (see Figure 11) LSC graph error ||tt ||Zq0,64μm
Zhengda magnification
MZC waviness error
AW,0.52um
amplification rate
Figure 10
filter
15~156
Community circle center assessment waviness error AW, LSC wrinkle degree setter
AWg0.57μm
High efficiency rate
|15 1.5(
Figure 11 uses the small squares square circle center to evaluate the waviness error 4W. When the measurement value is controversial due to method differences, the evaluation value based on the minimum area circle center method shall prevail. 6.2 Steel ball circle Evaluation of roundness and waviness errors of steel balls The maximum value of the two cross-section measurements is used as the roundness or waviness error value. 6.3 Output of the evaluation results
JB/T6642-2004
In the output results. , the three parameters of amplification, frequency response range of the filter and roundness or waviness error value should be given. 6.4 Evaluation code
6.4.1 Roundness error evaluation code
The degree error evaluation code consists of AZ plus a corner letter Z indicating the corresponding evaluation center, - the roundness error where the evaluation center is the center of the smallest area circle, >Z - the roundness where the evaluation center is the center of the least square circle. Error. 6.4.2 Waviness error evaluation code
The waviness error evaluation code is given by
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