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GB/T 33624-2017: Rolling Bearings - Test and Assessment Methods for Cleanliness
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT33624-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Rolling Bearings – Test and
Assessment Methods for Cleanliness
Issued on: MAY 12, 2017
Implemented on: DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3
1 Application Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Measuring Principle ... 6
5 Environmental Conditions for Measurement ... 6
6 Measuring Equipment, Appliances and Materials and Washing of
Appliances ... 6
7 Measuring Procedure ... 6
8 Cleanliness Assessment ... 10
Annex A (Normative) Measuring Method for Dust Fall Quantity on Unit Area
of Cleanliness Test Room ... 12
Annex B (Normative) Cleanliness Measuring Equipment, Appliances and
Materials and Washing of Appliances ... 14
Annex C (Normative) Blank Experiment Procedure and Effective Filtration
Area (EFA) Calibration Procedure ... 18
Annex D (Informative) Cleanliness Limits of Radial Ball Bearings ... 19
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Rolling Bearings (SAC/TC 98).
The drafting organizations of this Standard. Hangzhou Bearing Test and Research
Centre, Jinfa Bearing Co., Ltd., Tianma Bearing Group Co., Ltd., Ningxia Qinchang
Rolling-Bearing Manufacturing Co., Ltd., National Bearing Products Testing Centre,
Zhejiang XCC Group Co., Ltd., Zhejiang Huanyu Bearing Co., Ltd., Zhejiang Chentong
Bearing Co., Ltd.
The main drafters of this Standard. Zhang Yajun, Chen Fanghua, Xu Jingxian, Zhao
Liya, Li Xianhong, Shi Dafang, Liu Changming, Yang Weichun, Zhang Xunlei, Luo Qing,
Zhang Xiaopeng, Zhang Baoming, Chen Lingfang, Li Xinglin.
Rolling Bearings – Test and
Assessment Methods for Cleanliness
1 Application Scope
This Standard specifies the test and assessment of cleanliness of rolling bearings
(hereinafter referred to as bearings) and bearing parts.
This Standard applies to the test and assessment of all kinds of open bearings and
closed bearings before greasing, as well as the test and assessment of bearing parts.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
SH 0004-1990 (2007), Solvent Oil for Use in Rubber Industry
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
impurity
Particles which adhere to the surface of bearings/bearing parts and are adverse to the
performance of bearings.
3.2
particle size
The maximum size of particles (the maximum distance between points on the contour
line of the particle image map).
3.3
bearing/bearing part cleanliness
The size of impurity on each bearing/each bearing part or the weight of unit surface
area; the size and quantity of impurity particle on each bearing/each bearing part or
wash the appliances once again as specified in B.3 or carry out blank test once again
after using filtration membrane of pore size 0.45 μm to filter the solvent once again.
7.2 Measuring procedure of weighing method
7.2.1 Liquid sample preparation
7.2.1.1 Unless the cleanliness of the samples is so poor that the filtration speed of
the liquid samples is lowered, multiple sets/pieces may be washed and measured
together with the weighing method.
7.2.1.2 No scrubbing shall be carried out for the samples after opening package.
7.2.1.3 Soak cleaning. Use solvent to soak the samples in a container for more than
2 h; shake or rotate them one by one to make the impurity on the surface of the
samples fall off to come into solvent. The use level of solvent shall ensure the samples
are fully soaked in the container more than 10 mm.
7.2.1.4 Ultrasonic cleaning. Wash the samples twice by ultrasonic cleaning, 2 min for
each time of cleaning. The use level of solvent for each time shall not be less than 200
mL and the height of solvent in the container shall not be lower than two times of the
height of the samples. Multiple sets/pieces are allowed to be washed, but the samples
are not allowed to be overlapped or staggered.
7.2.1.5 Washing of the samples with grooves or curls. Use solvent in the washing
bottle to wash the surface of the samples to fully wash away impurity; collect the
washings into the container.
7.2.1.6 All washings are liquid samples.
7.2.2 Preparation and weighing of filtration membrane
7.2.2.1 Use tweezers to take 2 pieces of filtration membrane of pore size 1.2 μm to
place into two weighing bottles marked “Test (s)” and “Control (k)”; place them semi-
openly into the thermostatic chamber for drying for 60 min at 60°C ± 5°C; put on the
cap for them before placing them into the desiccator for cooling for 30 min; then use
the analytical balance to weigh the two filtration membranes respectively; record them
as ms1 and ms2. The filtration membranes shall be dried and weighed twice; the
difference between the two weighing results shall not be greater than 0.2 mg; if the
difference is greater than 0.2 mg, carry out drying and weighing once again and the
final weighing results shall prevail.
7.2.2.2 Use tweezers to take out the filtration membranes from the weighing bottles;
place in solvent to soak them before placing them flatwise on the microporous filter,
with the control membrane (k) as the lower membrane and the test filtration membrane
(s) as the upper membrane.
7.2.2.3 Press the upper funnel on the filtration membrane; use the clamping device
to clamp the upper funnel, filtration membranes, microporous filter, lower funnel and
up to 50 μm; greater than 50 μm up to 100 μm; greater than 100 μm.
7.3.3 Liquid sample preparation and counting filtration membrane preparation
7.3.3.1 Prepare liquid samples as specified in 7.2.1.2 ~ 7.2.1.6.
7.3.3.2 Select one filtration membrane of appropriate pore size in accordance with
the minimum counting particle size; use tweezers to clamp the filtration membranes
for soaking before place flatwise on the microporous filter.
7.3.3.3 Carry out liquid samples filtration and impurity collection as specified in
7.2.2.3 ~ 7.2.2.5.
7.3.3.4 Use tweezers to take down the filtration membranes from the microporous
filter and place flatwise in the weighing bottle.
7.3.3.5 Place the weighing bottles semi-openly in the thermostatic chamber for drying
for 60 min at 60°C ± 5°C; then put on the cap for them before placing them into the
desiccator for cooling for 30 min
7.3.4 Counting procedure
7.3.4.1 If the samples need to be assessed using the weighing method and the
particle counting method in combination, the use the test filtration membrane as the
counting filtration membrane and the control filtration membrane without counting.
7.3.4.2 Use tweezers to take out the counting membrane from the weighing bottle;
place flatwise carefully on the filtration membrane fixer tray; put on the cover before
mounting to the clamping device on the stage of the microscope.
7.3.4.3 In accordance with the minimum counting particle size, select the objective
lens of appropriate power; carry out lightness adjustment and shade correction for the
microscope; set the diameter of effective filtration area, diameter of counting area, size
of minimum counting particle, size segment of counting particles and other parameters;
carry out scanning, particle size measurement and quantity statistics for the counting
filtration membranes.
7.3.4.4 Output measuring results in accordance with the assessment items. The
assessment items may include but not limited to the total count of particles larger than
the minimum counting size, the count of particles of all size segments, the count of
reflective particles of all size segments and the count of non-reflective particles, the
maximum particle size and so on.
7.3.4.5 If there is any dispute in the large particle size, the auxiliary function of the
image analyser may be used to identify its morphology on the view screen; then the
computer system may be used to remove the small overlapping particles for the
staggered particles and then output the measuring results o...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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