1 Scope
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, storage, transportation and other relevant requirements of friction damper wedge for freight car.
This standard is applicable to the manufacture and inspection of friction damper wedge for freight car.
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 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature (GB/T 228.1-2010, ISO 6892-1: 2009, MOD)
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method (GB/T 229-2007, ISO 148-1: 2006, MOD)
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (Scales A, B, C, D, E, F, G, H, K, N and T) (GB/T 230.1-2009, ISO 6508-1: 2005, MOD)
GB/T 1033.1 Plastics - Methods for Determining the Density of Non-cellular Plastics - Part 1: Immersion Method, Liquid Pyknometer Method and Titration Method (GB/T 1033.1-2008, ISO 1183-1: 2004, IDT)
GB/T 1034 Plastics - Determination of Water Absorption (GB/T 1034-2008, ISO 62: 2008, IDT)
GB/T 1040.1 Plastics - Determination of Tensile Properties - Part 1: General Principles (GB/T 1040.1-2006, ISO 527-1: 1993, IDT)
GB/T 1040.2 Plastics - Determination of Tensile Properties - Part 2: Test Conditions for Moulding and Extrusion Plastics (GB/T 1040.2-2006, ISO 527-2: 1993, IDT)
GB/T 1043.1 Plastics - Determination of Charpy Impact Properties- Part 1: Non-instrumented Impact Test (GB/T 1043.1-2008, ISO 179-1: 2000, IDT)
GB/T 1184-1996 Geometrical Tolerances for Features without Individual Tolerance Indications (eqv ISO 2768-2: 1989)
GB/T 1348-2009 Spheroidal Graphite Iron Castings (ISO 1083: 2004, MOD)
GB/T 1450.1 Fibre-reinforced Plastic Composites -Determination of Interlaminar Shear Strength
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (eqv ISO 2768-1: 1989)
GB/T 2918 Plastics - Standard Atmospheres for Conditioning and Testing (GB/T 2918-1998, idt ISO 291: 1997)
GB/T 3398.1 Plastics - Determination of Hardness - Part 1: Ball Indentation Method (GB/T 3398.1-2008, ISO 2039-1: 2001, IDT)
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 6414-1999 Castings - System of Dimensional Tolerances and Machining Allowances (eqv ISO 8062: 1994)
GB/T 9441-2009 Metallographic Test for Spheroidal Graphite Cast Iron (ISO 945-1: 2008, MOD)
TB/T 2456.15 Gauges for Wedges On Freight Car
ISO 11358: 1997 Plastics - Thermogravimetry (TG) of Polymers - General Principles
3 Technical Requirements
3.1 General requirements
3.1.1 The friction damper wedge for freight car is classified into two types, i.e., the integral type and the combined type, according to its structural form. The combined-type wedge is comprised of main friction plate, wedge body, gasket, pin and other parts.
3.1.2 The geometrical dimensions of the integral-type wedge (hereinafter referred to as the wedge) and the combined-type wedge shall meet the requirements of product drawings; the unnoted casting dimensional tolerances shall meet the requirements of Grade CT11 as stated in GB/T 6414-1999, the unnoted machining dimensional tolerances shall meet the requirements of Grade m as stated in GB/T 1804-2000, and the unnoted geometrical tolerances shall meet the requirements of Grade L as stated in GB/T 1184-1996.
3.1.3 The material of the wedge and the wedge body is austenite-bainite ductile iron (ADI), and that of the main friction plate is polymer composite material.
3.1.4 The main friction plate shall meet the service requirements in the case that the ambient temperature is -50℃ ~ +70℃.
3.2 Manufacture requirements
3.2.1 Wedge and wedge body
3.2.1.1 The metallographic structure of the wedge and the wedge body shall meet the following requirements:
a) Its nodulizing grade is from Grades 1 to 3 as stated in GB/T 9441-2009 (the nodularity is not lower than 80%);
b) The floated graphite and the exploded graphite shall not exist;
c) The total amount of carbide and steadite in the base shall not exceed 5%.
3.2.1.2 See Appendix A for the chemical compositions of the wedge and the wedge body.
Foreword I
1 Scope
2 Normative References
3 Technical Requirements
4 Inspection Methods
5 Inspection Rules
6 Marking, Packaging, Storage and Transportation
Appendix A (Informative) Chemical Compositions and Analysis Methods of the Wedge and Wedge Body
Appendix B (Normative) Test Methods of Frictional Coefficient for Main Friction Plate Products
Appendix C (Normative) Frictional Property Test Method for Material of Main Friction Plate
Appendix D (Normative) Test Method for Adhesive Force Between Main Friction Plates
Appendix E (Normative) Test Method for Round Navel Shear Force of the Main Friction Plate
