Detail of JB/T 5389.2-2017

Introduction of JB/T 5389.2-2017

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. JB/T 5389 Rolling Bearings - Roller Bearings for Rolling Mills has two parts: ——Part 1: Four-row Cylindrical Roller Bearings; ——Part 2: Double-row and Four-row Tapered Roller Bearings. This part is Part 2 of JB/T 5389. This part is developed in accordance with the rules given in GB/T 1.1-2009. This part replaces JB/T 5389.2-2005 Rolling Bearings - Double-row and Four-row Tapered Roller Bearings for Rolling Mills. In addition to editorial changes, the following main technical changes have been made with respect to JB/T 5389.2-2005: ——the name of the standard (see the cover and front page of this edition as well as those of 2005 edition) is modified; ——the code and successive sequence and content of main structural types are adjusted, (see Chapters 4 and 5; Chapters 4 and 5 of 2005 edition); ——the structural types and boundary dimensions of Type 370000 and Type 370000D bearings are added (see Figures 2 and 3 and Table 1); ——the technical requirements for surface roughness and appearance quality are added (see Chapter 7); ——the inspection for rotating flexibility and appearance quality is added (see Chapter 8); ——the content of rustproof packaging is specified in a separate chapter (see Chapter 11; 9.2 of 2005 edition). This part was proposed by China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee on Rolling Bearing of Standardization Administration of China (SAC/TC 98). The previous editions of this part are as follows: ——JB/T 5389.2-1995, JB/T 5389.2-2005. Rolling Bearings - Roller Bearings for Rolling Mills - Part 2: Double-row and Four-row Tapered Roller Bearings 1 Scope This part of JB/T 5389 specifies the main identification codes, structural types, boundary dimensions, technical specifications, inspection methods, inspection rules and marking and rustproof packaging of double-row tapered roller bearings for rolling mills (hereinafter referred to as the “double-row bearing”) and the four-row tapered roller bearings for rolling mills (hereinafter referred to as the “four-row bearing”). This part is applicable to the production, inspection and acceptance of double-row and four-row tapered roller bearings for rolling mills. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 272 Rolling Bearing - Identification Code GB/T 299-2008 Rolling Bearings - Metric Double Row Tapered Roller Bearings - Boundary Dimensions GB/T 300-2008 Rolling Bearings - Four Row tapered Roller Bearings - Boundary Dimensions GB/T 307.2-2005 Rolling Bearings - Measuring and Gauging Principles and Methods GB/T 307.3-2005 Rolling Bearings - General Technical Regulations GB/T 699-2015 Quality Carbon Structure Steel GB/T 711-2008 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide Strips GB/T 3203-2016 Specification for Carburizing Steels of Bearings GB/T 4199-2003 Rolling Bearings - Tolerances - Definitions GB/T 7811-2015 Rolling Bearings - Symbols for Physical Quantities GB/T 8597-2013 Rolling Bearings - Rust Proof Packaging GB/T 13237-2013 Cold Rolled Quality Carbon Structural Steel Sheets and Strips GB/T 18254-2016 High-carbon Chromium Bearing Steel GB/T 24605-2009 Rolling Bearings - Marking for Products GB/T 24608-2009 Inspection Rules for Rolling Bearings and Commercial Parts JB/T 1255-2014 Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment JB/T 7051-2006 Rolling Bearing Parts - Methods for the Measurement and Assessment of Surface Roughness JB/T 8236-2010 Rolling Bearings - Internal Clearances and Adjusting Methods for Double-row and Four-row Tapered Roller Bearings JB/T 8881-2011 Rolling Bearings - Carburizing Heat - Treatment for Parts - Specifications JB/T 10336-2017 Rolling Bearings - Supplementary Specifications 3 Symbols For the purposes of this document, the symbols given in GB/T 4199-2003 and GB/T 7811-2015 and the following apply. D1mp max-D2mp min: the difference between the maximum and minimum mean outside diameters of the outer rings of a bearing. d1mp max-d2mp min: the difference between the maximum and minimum mean bore diameters of the inner rings of a bearing. r: the nominal chamfer of inner ring rsmin: the minimum single chamfer dimension of inner ring r1: the nominal chamfer of outer ring r1min: the minimum single chamfer dimension of outer ring T3: the width of Type 370000 and Type 370000D double-row tapered roller bearings (assembly) 4 Identification Code The identification code of bearings shall be in accordance with those specified in GB/T 272. 5 Main Structural Types (See Figures 1~4) Figure 1 Double-row Tapered Roller Bearing Type 350000 Figure 2 Double-row Tapered Roller Bearing Type 370000 Figure 3 Double-row Tapered Roller Bearing Type 370000D Figure 4 Four-row Tapered Roller Bearing Type 380000 6 Boundary Dimensions 6.1 The boundary dimension of double-row tapered roller bearing of Type 350000 shall be in accordance with those specified in GB/T 299-2008. 6.2 The boundary dimensions of double-row tapered roller bearings of Type 370000 and Type 370000D are detailed in Table 1. 6.3 The boundary dimension of four-row tapered roller bearing of Type 380000 shall be in accordance with those specified in GB/T 300-2008. Table 1 Boundary Dimensions of Bearings of Type 370000 and Type 370000D In: mm Bearing type d D T3 B rsmin r1smin Type 370000 Type 370000D 374032X2 374934X2 374134X3 373334X2 375236X1 372336X3 373138 373138X2 374140 374240X2 374240X3 372440X3 373142X2 373342X2 372442X3 373144X1 373248X3 374152X3 373152X3 374152X1 374956X3 370657 370658 373260X3 372060X3 373160 374160X3 370661 370661X1 374264X3 370666 374168 374272X3 373276X1 370678 374180X2 370682 373088X2 370690 370690X3 373092X3 374092X2 3731/500X3 3741/500X3 3706/510 3749/530X2 3740/530X1 3706/570 3706/580 3740/600X2 3741/630 3706/635 3706/690 3758/710X3 3706/724 374032X2D 374934X2D 374134X3D 373334X2D 375236X1D 372336X3D 373138D 373138X2D 374140D 374240X2D 374240X3D 372440X3D 373142X2D 373342X2D 372442X3D 373144X1D 373248X3D 374152X3D 373152X3D 374152X1D 374956X3D 370657D 370658D 373260X3D 372060X3D 373160D 374160X3D 370661D 370661X1D 374264X3D 370666D 374168D 374272X3D 373276X1D 370678D 374180X2D 370682D 373088X2D 370690D 370690X3D 373092X3D 374092X2D 3731/500X3D 3741/500X3D 3706/510D 3749/530X2D 3740/530X1D 3706/570D 3706/580D 3740/600X2D 3741/630D 3706/635D 3706/690D 3758/710X3D 3706/724D 160 170 170 170 180 180 190 190 200 200 200 200 210 210 210 220 240 260 260 260 280 285 290 300 300 300 300 305 305 320 330 340 360 380 390 400 410 440 450 450 460 460 500 500 510 530 530 570 580 600 630 635 690 710 724 240 230 295 360 330 400 320 320 340 360 380 460 355 440 480 360 460 420 459 500 389.5 380 450 560 440 500 520 500 560 620 540 580 680 650 570 650 580 650 820 830 655 680 820 870 733.5 710 730 750 830 870 1030 939.8 980 900 915 76 65 100 160 190 232 104 114 140 170 180 260 127 244 230 120 140 170 155 180 92 92 180 170 105 160 210 200 200 282 176 243 330 240 200 240 160 150 300 320 184 230 256 340 200 190 250 240 280 270 400 304.8 355 197 187 76 65 100 160 190 232 104 114 140 170 180 260 127 244 230 120 140 170 155 180 92 92 180 170 105 160 210 200 200 282 176 243 330 240 200 240 160 150 300 320 184 230 256 340 200 190 250 240 280 270 400 304.8 355 197 187 1.5 0.7 2.5 2.5 1.5 5 3 3 3 1.5 1.5 6 5 5 6 3 5 5 5 5 4 1 3 5 4 4 6 4.3 6 2.5 5 4 4 3 5 6 7 6 7.5 7.5 2.5 4 7.5 6 3.3 5 6 6 3 6 3.3 3.2 6.5 3 5 3 2 4 4 5 4 3 3 3 4 4 5 3 6 6 4 5 5 4 5 4 2.5 4 5 4 5 5 6 5 5 5 4 7.5 6 5 6 4 6 7.5 7.5 6 4 7.5 9.5 3.3 5 6 6 6 6 6.4 6.4 6.5 6 5

Contents of JB/T 5389.2-2017

Foreword I 1 Scope 2 Normative References 3 Symbols 4 Identification Code 5 Main Structural Types (See Figures 1~4) 6 Boundary Dimensions 7 Technical Requirements 8 Test Methods 9 Inspection Rules 10 Marking 11 Rustproof Packaging