This standard specifies the measurement method and inspection rules for the surface roughness of rolling bearing parts. This standard is applicable to the measurement and evaluation of the surface roughness of high-carbon chromium bearing steel rings, steel balls, rollers and needles of various sizes. This standard is also applicable to the measurement and evaluation of the surface roughness of bearing parts made of stainless steel, cemented carbide, carbon steel, carburized steel and other materials. JB/T 7051-1993 Measurement and evaluation method for surface roughness of rolling bearing parts JB/T7051-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 705193
Rolling bearings
Parts surface roughness measurement and evaluation method 1993-09-23 Issued
Ministry of Machinery Industry of the People's Republic of China
1994-07-01 Implementation
Mechanical Industry Standard of the People's Republic of China
Rolling bearings
Parts surface roughness measurement and evaluation method 1 Subject content and scope of application
This standard specifies the measurement method and inspection rules for the surface roughness of rolling bearing parts. JB/T705193
This standard is applicable to the measurement and evaluation of the surface roughness of high carbon chromium bearing steel rings, steel balls, rollers and needle rollers of various sizes and specifications. This standard is also applicable to the measurement and evaluation of the surface roughness of bearing parts made of stainless steel, cemented carbide, carbon steel, carburized steel and other materials.
Referenced standards
GB1031
GB10610
3 Evaluation parameters
Surface roughness parameters and their values
Rules and methods for measuring surface roughness with stylus instruments Stylus electric profiler
Measure and evaluate according to one or two of the surface roughness parameters R1, R2, and R3 specified in the corresponding standards of the measured bearing parts. 3.1
3.2When the R2 of the ring groove cannot be measured due to the limitation of the measuring instrument or the size of the tested part, it is allowed to measure R3. The conversion from R2 to R4 is shown in Appendix A (reference). The two evaluation parameters R2 and R3 of the steel ball cannot be converted to each other. It is also not allowed to replace one parameter with another. 3.3
Sampling length and evaluation length
The sampling length of the ball is selected according to Table 1.
Nominal diameter Dw of the ball to be measured
The sampling length of other parts shall be selected according to GB1031. 4.2
Sampling length L
The evaluation length is equal to 5 times the sampling length. It is allowed to be less than 5 times when limited by the instrument structure or the size of the workpiece. Selection of measuring instruments and methods
The sleeve groove is measured with the rotating device or curvature measuring device of the stylus wheel inspection instrument. It can also be measured with a laser surface roughness instrument or interferometer 5.1
.
5.2 The sphere is measured with the ball measuring device or rotating device of the stylus wheel profilometer. It can also be measured with an interferometer or a laser surface roughness instrument. Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
JB/T 7051-93
5.3 Large and extra-large bearing parts are measured with a portable wheel gauge. 5.4 Other parts are measured with a stylus wheel gauge. 5.5 Surface roughness can be checked by comparing with a surface roughness comparison sample. The comparison sample and the inspected part should be made of the same material and made by the same processing method. In addition, the comparison sample and the measured part should have the same surface shape. 5.6 When there is a dispute between the results of the comparison sample and the results of the instrument measurement, the instrument measurement shall prevail: When there is a dispute between the results of the laser instrument and the interferometer and the profiler measurement, the R, value shall be based on the profiler measurement value, and the R, value shall be based on the interferometer measurement value. 6 Methods and rules for using wheel gauges
6.1 The cut-off wavelength (cut-off) should be equal to the selected sampling length value (l). 6.2 Generally, a guide head should be used. The radius of curvature of the guide head should not be less than 50 times the sampling length. Only when an independent benchmark has been established is it allowed not to use a guide head.
6.3 Stylus tips of different radius sizes are suitable for different measurement ranges. Table 2 gives the R value measurement ranges suitable for various tip radii.
Stylus tip radius nominal value
6.4 The indication error of the wheel instrument should not exceed ±10%. The indication variability should not exceed 6%. Applicable R value
6.5 When recording the graph with a profilometer, if the wheel graph is recorded with a given cut-off wavelength, the center line can be drawn within the evaluation length, and 5 sampling lengths can be selected continuously to calculate the parameters. If the recorded wheel graph is not filtered, the center line should be drawn within the sampling length. The sampling length should select a section of the curve whose general direction is parallel to the edge of the recording paper. Moreover, large fluctuations in the curve should be avoided, and several sampling lengths can be selected discontinuously to calculate the parameters (see the figure below). In the figure, L,=LV
Lp sampling length on the wheel rate diagram;
L——sampling length;
V. horizontal magnification.
6.6R is calculated in the evaluation length according to the following formula: R
Where: R,—R, value in the evaluation length
—R, value in the sampling length.
JB/T7051-93
7 Selection of measuring parts and determination of workpiece surface roughness measurement value 7.1 The measuring direction shall be perpendicular to the measured surface, without visually visible tilt, the moving direction of the probe shall be perpendicular to the machining trace, and the groove of the ring shall be measured on the contour line in the 2/3 area of ​​the groove bottom in the shaft section. The roller needle and the raceway of the ring shall be measured on the plain line, and the sphere shall be measured on the contour line in the plane passing through the center of the circle.
7.2 Five measuring parts shall be selected for the sphere; three for other parts. These measuring parts should be evenly distributed on the measured surface. The arithmetic mean of the measured values ​​of these parts is used as the measured value of the surface roughness of the measured surface of the workpiece. 7.3 If the maximum and minimum values ​​of the measured values ​​at the above-mentioned measuring parts differ by more than 1 times. The measuring parts should be increased by 1 time. And the arithmetic mean of the measured values ​​of all the increased measuring parts is used as the measured value of the surface roughness of the measured part. 7.4 The number of significant digits of the measured value should be consistent with the standard value. 8 Treatment of surface defects and coarse processing marks 8.1 Defects that have been clearly specified in relevant standards, such as cracks, rust, pores, sand holes, bumps, black spots, etc., are not included in the roughness measurement results. This should be noted in the verification report.
8.2 Coarse processing marks that may be produced under normal process conditions are still treated as roughness. JB/T 7051-93
Appendix A
Method for measuring the surface roughness of the ring groove by interferometer (reference)Www.bzxZ.net
When measuring the surface roughness of the ring groove by interferometer, it is allowed to use the approximate calculation method of R, that is, to calculate by the arithmetic mean of the 5 maximum peak-to-valley heights on the A1
curve at the bottom of the groove in a field of view (see Figure A1). Figure A
(A1)
A2 Select 3 evenly distributed measurement locations on the entire ring groove surface, and use the arithmetic mean of the measured values ​​of these 3 locations as the measured value of the surface roughness of the entire ring groove surface. A3 For the ring groove surface (limited to the ring groove surface), it is allowed to convert from R to R. The conversion relationship is shown in Table A1. Table Al
R value
Conversion should be R. Value
JB/T705193
Appendix B
Method for measuring the surface roughness of steel balls using interferometer (reference)
When only measuring the surface roughness of steel balls using interference. The R value at each part is the maximum peak-to-valley height in different measuring directions within a field of view B1
(see Figure B1).
B2 The R value of the entire steel ball surface is the average value of the R values ​​at 5 different parts; that is, R
Additional instructions:
This standard was proposed by the Standardization Technical Committee of the Rolling Bearing Industry. This standard was drafted by the Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wang Baolin and Xu Wenbao. (B1)
People's Republic of China
Mechanical Industry Standard
Rolling Shaft
Part Surface Roughness Measurement and Evaluation Method JB/T705193
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (P.O. Box 8144, Beijing
Langbian 100081)
Copyright reserved
Format 880×1230
No reproduction
Number of words 10.000
Sheet 1/2
First edition in May 1994
First printing in May 1994
Print number 00.001-500
No. 1293
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