This standard specifies the type and nomenclature, requirements, test methods, inspection rules, marking and packaging of spherical bearings for mining. This standard applies to spherical bearings for supporting swing shafts on mining machinery and other coal mining machinery and equipment that are subject to impact, vibration and heavy loads. MT/T 944-2005 Spherical bearings for mining MT/T944-2005 Standard download decompression password: www.bzxz.net

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Sale number: 15513-7025
Coal Industry Standard of the People's Republic of China
MT/T 944-2005
Spnerical plain bearings for mining2005-02-14 Issued
National Development and Reform Commission
2005-06-01 Implementation
Normative references
3 Definitions of terms
Type and naming
Test methods
Inspection regulations
&Hezhili packaging
Appendix A (Appendix on wide material) Calculation method for rated dynamic load and life and rated static load of spneric plain bearings for mining
Mrr/I 944—2005
M7/r944—2005
Appendix A of the standard is a data appendix.
This standard is issued by the Technical Development Department of China Coal Industry Association. The standard is under the jurisdiction of the Coal and Mining Equipment Standardization Technical Committee. The drafting unit of this standard is the Second Branch of the China Coal and Mining Research Institute. The main drafters of this standard are Wu Liya, Feng Jingyou, Zhong Ting, Hu Xuwu, and Qian Xueyi. 1 Scope
Spherical bearings for mining
MT/T944—2005
This standard specifies the type and name requirements, test methods, inspection marks, and other equipment. This standard is applicable to the spherical bearings on coal mining machinery and equipment such as mining machines that bear the load, speed, and transmission. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard: For any dated referenced documents, all subsequent revisions (excluding errors or amendments) are not applicable to this standard. However, all parties who have reached an agreement on the revision of this standard may use the latest versions of these documents. For any referenced documents not marked in the following, the latest version shall apply to this standard GB/T307.2-195. Original date and method (neg[30/TR9274:1991) GH/T3944—2002 Vocabulary of spherical bearings (ISOA11:338IDZ) GB/T9:53—2001 American joint auxiliary bearings (ey112240-1,1!98) JTR/T1255—2001 Technical conditions for heat treatment of high carbon grade bearings and rolling bearing parts 3 Terms and definitions
The following terms and definitions shall apply to this standard. 3. 1
Spherical bearings for coal mining machinery with spherical contact surfaces, designed for dynamic motion, bearing radial and axial impact loads, and cannot be used with general joint shafts. 3. 2
Inner ring
Spherical bearing parts with spherical outer liquid surface. [CB/T3944—2002.Terms and Definitions 02.02.01]3. 3
Outer ring
It is a radial bearing with a spherical inner surface. GB/T3944--2012. Terminology and text 52.52.063.4
General term for inner ring and outer ring.
Filling groove fillingsats
On one end face of the outer ring, from the radial direction and the opposite, this is for installation. Note: G B/3944222.Terms and definitions 02,01,11,3.6
Dissection diagram danblefracturedouterrlg To facilitate the assembly of the bearing, it is first made into a complete vehicle, and then the bearing is broken along the axis at a relatively high position to form a cut-out outer shell. Letter: Modified GB/T3944-202.Term approval document 02.02.12MT/T944-2C95
4 Type and nomenclature
4. 1 Type
Extended bearing (hereinafter referred to as the policy> belongs to the second light to mature centrifugal bearing market requirements, and has the following characteristics: general equipment fast material shaft steel road:
Medical vehicle structure is divided into assembly sugar type brand external diagram (hereinafter referred to as the assembly expansion type) (Figure 1) and split external diagram (hereinafter referred to as the commercial test) Figure 2) two types,
Assembly type bearing
4.2 series size
The existing series of bearing size table! , ||tt ||4.3 Naming
4.3.1 Code compilation method
The shaft codes and connections are organized in the following manner:
Figure 2 Split bearings
For example
-2-125
-55~188
118180
156~190
.53195
1+2--221
x --227
4.3.2 Example of code marking
MT/T 944--20G5
External diameter of bearing, unit is mm
Outer diameter, unit is mm
Inner diameter, unit is mm
Slotted bearing
Production: Assembled bearing with inner diameter 340mm, outer diameter 46um, width 118mm, Example 2:
Indicates, split bearing with inner diameter 8xm, outer diameter 13mr, width 80mm. 5 Requirements
5.1 Appearance
The bearing surface shall not have any chain, scratches, rust, etc.! The internal and external drawings of the bearing shall not have any jamming phenomenon after assembly and after the dynamic response. 5.2 Dimensions
Single scale ruler:
: Inner diameter d, the dimensions shall conform to the requirements of Table 7 in GB/T9163--201! The external dimension tolerance shall comply with the provisions of Table 9 in 9/9:G3-2301: .· The internal and external dimension tolerances shall comply with the provisions of Table 7 in GB/191632CC1; the spherical diameter α of the inner and outer rings shall be less than 5, and the requirements of the product drawing shall be met; the chamfer radius of the inner hole and the outer end shall meet the requirements of the product drawing. 5.3 The radial running direction of the bearing shall comply with the provisions of Table 1. 5.4 Surface roughness The inner ring inner hole surface, the outer ring outer ring, the outer ring end and the spherical surface roughness R... shall comply with the provisions of Table 2 Table 2 General nominal ... 0
Note: The nominal size is the same as the inner hole, the outer surface is the same as the outer surface, and the outer surface is the same as the outer surface. MT/T944-2005
5.5 Hardness
The hardness shall comply with the provisions of Table 5.
5. 6 Metallographic structure
The metallographic structure after heat treatment shall comply with the provisions of 3.2.3 of 1B/T1255-2301. 5.7 After the deformation rate is large, defects such as twisting are not allowed. 5. 8 Before the calculation, the provisional dynamic load and rated static load of the auxiliary bearing shall refer to the calculation method in Appendix A. Table 3 Inner diameter should be Inner diameter GCtl:SiM:59-55558--54 Note: Inner thickness is equal to spherical diameter t, 6 Test method 6.1 Appearance inspection 57--93 $] ~·Fr F3~·R2 4) Outer thickness is equal to spherical diameter (-spherical diameter 1/2) The method for measuring the appearance of the bearing is changed. 6.2 Dimension inspection Inner diameter technology GB/T337.21395 7.1 measurement method: External protection 2 12·~23
Outer diameter
>25--50
The diameter of the outer ring shall be measured according to 7.3 of GB/T337.2:995 (the shaft multiplication shall be measured in the process); the ring width shall be measured according to 7.4 of GB/1307.2-19s; the side angle radius shall be measured according to 7. of GB/T307.2-195.6.3 Detection of radial clearance
6.3.1 The radial clearance shall be thoroughly tested in the finished product state. The tester shall fix one set of sleeves (the sleeve shall not be deformed), and the other one shall move in the main diameter direction, and perform sequential moving measurement at three places 120\ apart on the circumference of the drawing. The arithmetic average is the radial clearance. 6.3.2 For large-size bearings (i.e. 120 mm), the radial clearance should be determined by measuring the spherical straightness of the inner and outer surfaces before the bearings are assembled.
6.3.3 The radial clearance of split bearings should be tested before the splitting process. If it is necessary to test after the splitting process, a 1-10 mold should be prepared and installed in the joint housing for measurement. 6.4 Surface roughness test
The surface roughness measuring instrument or the surface roughness comparison sample are used to compare the strain. 5.5 The liquid level method for testing the hardness is as follows
It is measured with a C scale.
The test surface is usually on the circumference of the sleeve. The hardness test points of each property are specified as follows: D30mm, one point is measured every 150~4005mm on the circumference, and each part has at least 8 points; D20C~430mm, one point is measured every 100mm on the circumference, and each part has at least 5 points; D200mm, one point is measured every 120mm on the circumference, and each part has 3 points. MIT/T 944-2005
d) If the test point exceeds the tolerance, the two points can be re-checked at -5mm. If the re-checked points are qualified, the qualified data will be excluded; if there are still points exceeding the tolerance, the data will be excluded, and the initial inspection and qualified data will be recorded in the hardness test batch report. 6.6 Metallographic structure inspection
The micro-metallographic structure inspection method shall comply with the provisions of Table 7 in MIT/T 944-2001. 6.7 The inspection method for detecting cracks in the bearing sleeve shall comply with the provisions of Table 7 in B/1255-2001. 7 Inspection rules 7.1 Inspection categories Bearing inspection is divided into full inspection and type inspection 7.2 Factory inspection 7.2.1 Bearings shall be inspected one by one by the quality management department of the manufacturing enterprise: 7.2.2 Factory inspection items are shown in Table 4.
External inspection
Dimension loss
Diameter and oil inspection
Wardrobe matching
Dense surface hardness
Metallographic examination
Flaw detection
Note: ★ indicates that inspection is required, " ★ indicates that inspection is not required, 7. 2. 3
If all the inspection items of the product are met, the product is deemed qualified, and if one item is unqualified, the product is deemed unqualified. 7.3 Type pull test
7. 3.1H Type inspection shall be carried out in any of the following cases: Trial production of new products:
b! Completed products transferred to other factories or resumed after 3 years of suspension:) When the national quality supervision agency proposes the requirements for type inspection. 7.3.2 Type inspection items are shown in Table 1,
7.3.3 The number of type inspection is [pieces, and the daily inspection party randomly selects from the products that have passed the factory inspection. 7.3.4 If all the products are qualified, the product is judged to have passed the factory inspection. ：If one of the inspection items F is unqualified, the purchaser shall determine that the type inspection of the product is not qualified.
8 Marking and packaging
8.1 Marking
The extraction mark shall meet the following requirements
The shaft rear cup mark quantity mark can be on the reference end of the paste drawing. Mark the shaft flat code on the inner pot surface, the manufacturing code (or trademark! : The same product number is marked on the outer measurement (sound code) and the mountain ring end surface: r
MT/T944 —2005
The bearing code, quantity, manufacturer name (or trademark) and date of production shall be marked on the surface of the packaging container. 8.2 Packaging
The bearing packaging shall meet the following requirements:
a) The bearings shall be cleaned and rust-proofed before packaging. Under normal storage and transportation conditions, they shall be kept free of rust within 12 months. The rust-proof amount shall be calculated based on the factory load.
The inside and outside of the bearings and the packaging shall ensure that they will not be damaged or have quality problems during transportation and storage. The packaging should contain a quality certificate + the certificate should indicate: manufacturing name or sound mark:
2) Bearing code
"Packing date.
Appendix A
(Informative Appendix)
Calculation method of rated dynamic load and life and rated static load for mining joint auxiliary bearings A1 Calculation method of rated dynamic load and life (according to IB/85E5-[997) A, 1.1 Calculation method of rated dynamic load
Cs y,Bd..
Where:
Rated dynamic load, unit is Newton (V);
5.--Coefficient, when 5≤l_ =40n, f,=85, when 400-4,500, f,=87
When 500-700, f=90;
B-bearing width, unit is meter (mm): spherical nominal diameter, unit is radial (rm) A1.2 Equivalent dynamic load calculation method
—The equivalent dynamic load when the bearing is subjected to constant radial and axial combined loads, unit is Newton (N) x.
Equivalent dynamic load coefficient, X, value see Table A.1
F, radial load unit is Newton (N).
Table A]
Method: F, is the axial number, A is (N)-
A, t.3 Life calculation method
The life of the bearing is related to the bearing force and the use conditions of the bearing. A, 1. 3. 1 Sugar multiplication or surface sliding damage
-- 2. 308 9 × 1c-pfd
Wu Zhong: bzxz.net
Spherical sliding speed, the unit is mm/s2 Packaging
Bearing packaging should meet the following requirements:
a) Bearings must be cleaned and rust-proofed before packaging. Under normal storage and transportation conditions, they should be kept free of rust within 12 months. The rust-proof collection is calculated based on the factory load:
The interior and exterior of the packaging should ensure that they will not be damaged or the quality will be reduced during transportation and storage. The packaging should have a quality certificate + The certificate should indicate: manufacturing name or sound mark:
2) Bearing code
"Packing date.
Attachment A
(Informative Appendix)
Methods for calculating rated dynamic load and life and rated static load of mining joint auxiliary bearings A1 Calculation method of rated dynamic load and life (according to IB/85E5-[997) A, 1.1 Calculation method of rated dynamic load
Cs y,Bd..
Wherein:
Rated dynamic force, in Newton (V);
5.—-Coefficient, when 5≤l_ =40n, f,=85,400-4,500 when f,=87
When 500-700 when f=90;
B-bearing width, unit is meter (mm): spherical nominal diameter, unit is radian (rm) A1.2 Equivalent dynamic load calculation method
—The equivalent dynamic load when the bearing is subjected to constant radial and axial combined loads is in Newton (N) x.
Equivalent dynamic load coefficient, X, value see Table A.1
F, radial load unit is Newton (N).
Table A】
Method: F, is the axial load, unit is (N)-
A, t.3 Life calculation method
The life of the bearing is related to the bearing load and the use conditions of the bearing A, 1. 3. 1 Multiplication or surface sliding
-- 2. 308 9 × 1c-pfd
Wu Zhong:
Spherical sliding speed, unit is mm/s2 Packaging
Bearing packaging should meet the following requirements:
a) Bearings must be cleaned and rust-proofed before packaging. Under normal storage and transportation conditions, they should be kept free of rust within 12 months. The rust-proof collection is calculated based on the factory load:
The interior and exterior of the packaging should ensure that they will not be damaged or the quality will be reduced during transportation and storage. The packaging should have a quality certificate + The certificate should indicate: manufacturing name or sound mark:
2) Bearing code
"Packing date.
Attachment A
(Informative Appendix)
Methods for calculating rated dynamic load and life and rated static load of mining joint auxiliary bearings A1 Calculation method of rated dynamic load and life (according to IB/85E5-[997) A, 1.1 Calculation method of rated dynamic load
Cs y,Bd..
Where:
Rated dynamic force, in Newton (V);
5.—-Coefficient, when 5≤l_ =40n, f,=85,400-4,500 when f,=87
When 500-700 when f=90;
B-bearing width, unit is meter (mm): spherical nominal diameter, unit is radian (rm) A1.2 Equivalent dynamic load calculation method
—The equivalent dynamic load when the bearing is subjected to constant radial and axial combined loads is in Newton (N) x.
Equivalent dynamic load coefficient, X, value see Table A.1
F, radial load unit is Newton (N).
Table A】
Method: F, is the axial load, unit is (N)-
A, t.3 Life calculation method
The life of the bearing is related to the bearing load and the use conditions of the bearing A, 1. 3. 1 Multiplication or surface sliding
-- 2. 308 9 × 1c-pfd
Wu Zhong:
Spherical sliding speed, unit is mm/s
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