JB/T 5389.2-1995 Technical specifications of four-row tapered roller bearings for rolling bearing rolling mills

JB/T 5389.2-1995 Technical conditions for four-row tapered roller bearings for rolling bearing rolling mills JB/T5389.2-1995 Standard download and decompression password: www.bzxz.net

JB/T5389.2
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Preface
This standard is formulated for the first time. The four-row tapered roller bearings specified in this standard for rolling mills are commonly used on the work rolls and back-up rolls of rolling mills -
Four-row tapered roller bearings are specified in the Outline Dimensions of the Bearing Type. Its overall dimensions are specified in GB300-87 "Rolling Bearings B11005--87 "Double-row and Four-row Tapered Roller Bearings Radial Clearance". This standard mainly specifies technical requirements such as dimensional tolerances. This standard was proposed by the National Rolling Bearing Standardization Technical Committee. This standard is under the jurisdiction of the Luoyang Bearing Research Institute of the Ministry of Machinery Industry. This standard was drafted by: Wafangdian Bearing Factory. The main drafter of this standard: Zou Renkai.
1 range
Machinery Industry Standard of the People's Republic of China
Rolling bearings
Four-row tapered roller bearings for rolling mills
Technical conditions
JB/T 5389.2--.1995
This standard specifies four-row tapered roller bearings for rolling mills (hereinafter referred to as Technical conditions for bearings). This standard is applicable to the manufacture and user acceptance of bearings. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard by reference. The versions shown are all valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest version of the following standards: GB300--87 Rolling Bearings Four-row Tapered Roller Bearings Outline Dimensions GB307.2-84 Rolling Bearings Tolerance measurement method GB307.3---84 rolling bearings
-general technical requirements
GB699-88 high-quality carbon structural steel technical conditions carburized bearing steel technical conditions
GB 3203- --82
GB 7811—87
JB 1255--91
Rolling bearing parameter symbol
High carbon chromium bearing steel rolling bearing parts heat treatment technical conditions JB/T 3016- -- 91
JB/T 3017--91
JB/T 3034-93
JB/T 3574---92
ZB J11 005- -- 87
ZB J11 015-88
ZB J11 020--89
ZB J36 001--
ZB J36 002--86
3 Symbols and Abbreviations
Symbols are shown in Figure 1.
Packaging nail board box technical conditions
Rolling bearings
Bearings
Packaging carton technical conditions
Oil seal anti-rust packaging
Rolling bearing product logo
Double and four-row cylindrical roller bearings radial clearance rolling bearings double and four-row Tapered roller bearing clearance adjustment method Rolling bearings and their product parts inspection rules Rolling bearing parts carburizing heat treatment quality standards Rolling bearing parts deep carburizing heat treatment quality standards Except for the following symbols, the symbols quoted in this standard should comply with the provisions of GB7811 d1mpmx-d2mmin. : The difference between the maximum average inner diameter and the minimum average inner diameter between the same bearing inner rings D1mpmxDampmin: The difference between the maximum average outer diameter and the minimum average outer diameter between the same bearing outer drawing A4: Deviation of the total width of the bearing inner ring
Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on 1996-07-01
44: Deviation of the total magic degree of the bearing outer ring
4 Technical requirements| |tt||4.1 Tolerance
JB/T 5389.2---1995
Figure 1
The tolerance level is divided into three levels, namely 0, 6 and 5. Bearing tolerances should comply with the provisions of Table 1 and Table 2 according to the tolerance level. Table 1 inner ring
exceeds|| tt||80
heart0
630||tt ||800
upper deviation
lower deviation
25||tt ||50
15| |tt||25
Vaa||tt ||public
85| |tt||100
level||tt ||5
cigmpn
8| |tt||11
Upper deviation
"Lower deviation
10o| |tt||1200
i|| tt||1200
180|| tt||25
150||tt| |180
Upper deviation||tt ||o
10061250
125011600
4.2 Clearance
6.5||tt| |Lower deviation
45||tt ||: 50
JB/T5389.2--1995
Table 2 Outer ring
The bearing clearance shall conform to the provisions of ZBJ11005. 4.3 Materials and heat treatment
Difference
38||tt ||55
4.3.1 Bearing parts made of high carbon chromium bearing steel should be selected from ZGCr15, ZGCr15SiMn, vacuum degassed GCr15, GCr15SiMn and one-tenth GCr15, GCr15SiMn bearing steels according to different use requirements. 4.3.2 The raw materials of bearing parts made of carburized bearing steel G20Cr2Ni4A and G20Cr2Ni4 shall comply with the provisions of (B3203. 4.3.3 The heat treatment quality of bearing parts made of high carbon chromium bearing steel shall comply with the provisions of JB1255. 4.3.4 The heat treatment quality of bearing parts made of carburized bearing steel shall comply with the provisions of ZBJ36 (0) 1 or Z13J36002 according to the depth of the carburized layer.
4.3.5 When the bearing operating temperature exceeds 120C, the bearing parts made of high carbon chromium bearing steel shall be subjected to high temperature tempering treatment, and their hardness shall comply with the provisions of JB1255.
4.3.6 The bearing spacer is made of 45 or 40 steel, and the raw materials shall comply with the provisions of GB699. The heat treatment hardness should reach 35~40HRC4.4 Bearing Bearing parts are not allowed to have cracks. There should be no burns, soft spots and decarburization on the working surface. 4.5 The items not specified in this standard shall comply with the product drawings and the provisions of the current standards. 5 Inspection methods
The tolerance measurement method shall be in accordance with the provisions of GB307.2. 5.1
The clearance measurement method shall be in accordance with the provisions of ZBJ11015. 5.2
5.3 The inspection method for cracks, soft spots and decarburization of bearing parts shall be in accordance with the provisions of JB1255. 5.4 The surface burns on bearing parts shall be inspected by the cold pickling method specified in JB31255. 6 Inspection rules
6.1 In addition to the provisions of ZBJ11020, the main inspection items of bearings shall also include dimupaxdzmpnuin1)1mvaxDupmino6.2 100% of the bearing rings and rollers shall be inspected for cracks. 513
7 Marking, rust prevention and packaging
JB/T5389.2--1995
The marking method of bearings shall comply with the provisions of JB/T3574. Bearings shall be rust-proofed and packaged internally and externally in accordance with the provisions of GB307.3, JB/T3034, JB/T3016 and JB/T3017. 514
2. Bearing rings and rollers should be 100% inspected for cracks. 513
7 Marking, rust prevention and packaging
JB/T5389.2--1995
The marking method of bearings should comply with JB /T3574 Bearings should be rust-proofed and packaged internally and externally in accordance with the provisions of GB307.3, JB/T3034JB/T3016 and JB/T3017, 514bZxz.net
2. Bearing rings and rollers should be 100% inspected for cracks. 513
7 Marking, rust prevention and packaging
JB/T5389.2--1995
The marking method of bearings should comply with JB /T3574 Bearings should be rust-proofed and packaged internally and externally in accordance with the provisions of GB307.3, JB/T3034JB/T3016 and JB/T3017, 514
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