This standard specifies the methods for magnetic particle inspection, magnetization specification, inspection procedure and acceptance rules of parts of rolling bearings for railway locomotive and rolling stock (hereinafter referred to as "railway bearings").
This standard is applicable to the magnetic particle inspection for cracks of surface and near-surface of railway bearing parts made from ferromagnetic materials and for other defects.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 9445-2005 N-on-destructive Testing - Qualification and Certification of Personnel (ISO 9712: 1999, IDT)
JB/T 6641-2007 Rolling Bearings - Residual Magnetism and Its Assessment Method
JB/T 8290-1998 Magnetic Particle Flaw Detectors
HB/Z 72-1998 Magnetic Particle Testing
3 General Requirements
3.1 All the railway bearing parts (rings and rollers) shall be carried out with 100% magnetic particle inspection, the inspected parts shall meet the requirements of Chapter 13.
3.2 All the railway bearing parts shall adopt wet method for magnetic particle inspection.
3.3 Continuous method or residual magnetic method may be adopted for magnetic particle inspection according to the specific conditions of the inspected parts, and continuous method shall be preferred; fluorescent magnetic particle method or non-fluorescent magnetic particle method may also be adopted for magnetic particle inspection, and fluorescent magnetic particle shall be preferred.
3.4 As for the finished parts and the manufacturing procedure (such as heat treatment, grinding and cold/thermal deformation process) easy to generate defects, magnetic particle inspection shall be carried out after that, however, as for the bearing ring for which surface phosphating is needed, flaw detection inspection shall be carried out before phosphating.
4 Operation Personnel for Inspection
4.1 The operation personnel engaging in magnetic particle inspection cannot conduct the operation of magnetic particle inspection until they pass professional technical training and get the non-destructive inspection personnel technical qualification certificate for Grade II or above magnetic particle inspection specified in GB/T 9445-2005.
4.2 Personnel engaging in magnetic particle inspection shall have good vision. Inspected according to Standard Logarithmic Visual Acuity Charts, their vision before and after correction shall be larger than 5.0; inspected according to Jaeger No. 1 eye chart, the short distance vision shall be larger than 1.0. Achromate shall not engage in magnetic particle inspection work.
5 Inspection Equipment
Contents Foreword I 1 Scope 2 Normative References 3 General Requirements 4 Operation Personnel for Inspection 5 Inspection Equipment 6 Magnetic Particles 7 Magnetic Ink 7.1 Oil Magnetic Ink 7.2 Water Magnetic Ink 7.3 Magnetic Ink Prepared with Other Formulae 8 Operation Procedure for Inspection 8.1 Operation Procedures 8.2 Operation Cautions 9 Magnetization Technology 9.1 Magnetization Direction 9.2 Magnetization Methods 10 Magnetization Specification 10.1 Circumferential Magnetization 10.2 Longitudinal Magnetization 10.3 Induced Current Magnetization Method 11 Demagnetization 12 Observation and Inspection Reports of Magnetic Particle Indications 12.1 Observation of Magnetic Particle Indications 12.2 Records of Magnetic Particle Indications 12.3 Inspection Report 13 Acceptance Rules 14 Equipment Maintenance and Process Control 14.1 Equipment Maintenance and Inspection for the Comprehensive Performance of Inspection System 14.2 Inspection of Magnetic Particle 14.3 Inspection and Maintenance of Magnetic Ink Performance 14.4 Inspection and Maintenance of Ultraviolet Lamp 14.5 Safety Protection Appendix A (Normative) Format of Magnetic Particle Inspection Report Foreword I 1 Scope 2 Normative References 3 General Requirements 4 Operation Personnel for Inspection 5 Inspection Equipment 6 Magnetic Particles 7 Magnetic Ink 7.1 Oil Magnetic Ink 7.2 Water Magnetic Ink 7.3 Magnetic Ink Prepared with Other Formulae 8 Operation Procedure for Inspection 8.1 Operation Procedures 8.2 Operation Cautions 9 Magnetization Technology 9.1 Magnetization Direction 9.2 Magnetization Methods 10 Magnetization Specification 10.1 Circumferential Magnetization 10.2 Longitudinal Magnetization 10.3 Induced Current Magnetization Method 11 Demagnetization 12 Observation and Inspection Reports of Magnetic Particle Indications 12.1 Observation of Magnetic Particle Indications 12.2 Records of Magnetic Particle Indications 12.3 Inspection Report 13 Acceptance Rules 14 Equipment Maintenance and Process Control 14.1 Equipment Maintenance and Inspection for the Comprehensive Performance of Inspection System 14.2 Inspection of Magnetic Particle 14.3 Inspection and Maintenance of Magnetic Ink Performance 14.4 Inspection and Maintenance of Ultraviolet Lamp 14.5 Safety Protection Appendix A (Normative) Format of Magnetic Particle Inspection Report
