1 Scope
This standard specifies the terminologies, definitions and symbols, technical requirements, inspection and test methods, inspection rules and marking, packaging, transportation and storage of brake shoes for freight rolling stock of railways.
This standard is applicable to brake shoes for freight rolling stock of railways with the maximum running speed of 120km/h and axle weight of 25t at maximum. Brake shoes for freight rolling stock of railways with axle weight greater than 25t may also refer to this standard.
2 Normative References
The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document
GB/T 700-2006 Carbon Structural Steels
GB/T 1033.1-2008 Plastics - Methods for Determining the Density of Non-cellular Plastics - Part 1: Immersion Method, Liquid Pyknometer Method and Titration Method
GB/T 1041-2008 Plastics - Determination of Compressive Properties
GB/T 1043.1-2008 Plastics - Determination of Charpy Impact Properties - Part 1: Non-instrumented Impact Test
GB/T 2918-1998 Plastics - Standard Atmospheres for Conditioning and Testing
GB/T 3398.2-2008 Plastics - Determination of Hardness - Part 2: Rockwell Hardness
GB/T 4617-2009 Plastics - Phenolic Mouldings - Determination of Acetone-soluble Matter
GB/T 6040-2002 General Rules for Infrared Analysis
GB/T 9341-2008 Plastics - Determination of Flexural Properties
TB/T 449 Wheel Profile for Locomotive and Car
TB/T 2456.20-2006 Brake Shoe Plate for Railway Rolling Stock
ISO 11358:1997 Plastics - Thermogravimetry (TG) of Polymers - General principles
3 Terminologies, Definitions and Symbols
For the purposes of this document, the following terminologies and definitions apply.
3.1
Instantaneous friction coefficient
The function of speed. It is the ratio of braking force to the brake shoe thrust at every instant during the braking process, expressed in φk.
Foreword i
1 Scope
2 Normative References
3 Terminologies, Definitions and Symbols
4 Classification and Application Requirements
5 Technical Requirements
5.1 Structure and Boundary Dimension
5.2 Appearance
5.3 Usage
5.4 Physical and Mechanical Properties
5.5 Brake Friction and Abrasion Properties
5.6 Bonding Strength of Friction Piece and Shoe Back
5.7 Materials and Manufacturing
6 Inspection and Test Methods
6.1 Appearance Inspection
6.2 Boundary and Fit Dimension Inspection
6.3 Physical and Mechanical Properties Test
6.4 Bonding Strength Test of Friction Piece and Shoe Back
6.5 Brake Friction and Abrasion Properties Test
6.6 Infrared Spectrum Analysis
6.7 Thermogravimetric Analysis
7 Inspection Rules
7.1 Delivery Inspection
7.2 Periodic Inspection
7.3 Type Inspection
7.4 Line Usage Assessment
8 Marking, Packaging, Transportation and Storage
8.1 Marking
8.2 Packaging
8.3 Transportation and Storage
Appendix A (Normative) Boundary and Fit Dimension of Brake Shoe
Appendix B (Normative) Permissible Range of the Instantaneous Friction Coefficient of Brake Shoe
Appendix C (Normative) Sampling Positions of Physical and Mechanical Properties Specimen
Appendix D (Normative) Determination Method of Compression Modulus
Appendix E (Normative) Test Method for Bonding Strength of Friction Piece and Shoe Back
Appendix F (Normative) Brake Friction Property Test Methods
References
