FORD WSS-M1A176-E1-2017 GRAY IRON BRAKE COMPONENTS DRUMS AND ROTORS TO BE USED WITH FORD WSS-M99P1111-A .pdf
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1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 00 2017 03 17 Released R. Tillenbureg EU Controlled document at www.MATS.com Copyright 2017, Ford Global Technologies, LLC Page 1 of 6 GRAY IRON, BRAKE COMPONENTS, DRUMS AND ROTORS WSS-M1A176-E1 GRAY IRON, BRAKE COMPONENTS, DRUMS AND ROT
2、ORS, IMPROVED DAMPING PROPERTIES WSS-M1A176-E2 GRAY IRON, BRAKE COMPONENTS, DRUMS AND ROTORS, IMPROVED TEMPERATURE PROPERTIES WSS-M1A176-E3 GRAY IRON, BRAKE COMPONENTS, DRUMS AND ROTORS, HIGH PERFORMANCE APPLICATIONS WSS-M1A176-E4 1. SCOPE The materials defined in these specifications are low to med
3、ium strength structural gray cast iron. 2. APPLICATION This specification was released originally for gray iron used for all brake rotor and brake drum applications. Specification E2, E3 and E4 are a lower strength, high carbon equivalent grade and shall not be used for unicast rotor applications. E
4、3 and E4 materials are low silicon cast irons which in combination with performance friction materials may result in increased wear and cracking resistance, where the B5 material should be used in high performance applications for HP1 and HP2 vehicles. E1 is low carbon material with higher tensile s
5、trength. Any deviation to the material specification should be included on the print adjacent to the specification number. The material selection is done by Foundation Brake Core Engineering in agreement with Brake System Lay Out Team. Table Material specification application guide Material specific
6、ation Material application guide E1 For brake discs with threaded holes for connection to hub; brakes for value vehicles; brakes for nonperformance vehicles E2 Front brakes; brakes facing issues with thermal cracking and NVH (material with better damping than E1) E3 Alternative to E2 for better heat
7、 conductivity, wear performance and cracking resistance E4 Alternative to E2 and E3 for better heat conductivity, wear performance and cracking resistance in high temperatures 3. REQUIREMENTS 3.1 APPROVED SOURCES This specification does not use approved sources. Any reliable supplier meeting these r
8、equirements may be used. ENGINEERING MATERIAL SPECIFICATION WSS-M1A176-E1/E2/E3/E4 Copyright 2017, Ford Global Technologies, LLC Page 2 of 6 3.2 PART SAMPLING LOCATIONS Cast or finished components must be used to determine conformance to this specification unless otherwise indicated on Engineering D
9、rawing. Table Part Sampling Locations * Fig. 1 Tensile Test Bar Hardness Microstructure Full-cast (or loose) Brake Rotor * Center of brake plate Hardness measured on center of brake plate (2 sides) every 90 (8 measurements). Center of brake plate; swan neck (connection of friction ring to hat) Unica
10、st Brake Rotor* Wheel mounting flange Hardness measured on center of brake plate (2 sides) every 90 (8 measurements). Cross-section of cup seat swan neck (connection of friction ring to hat) Brake Drum Side wall Inboard rim edge every 90 (4 measurements). On braking surface * Where callouts of this
11、table are not suitable due to part geometry or section size, the sampling locations will be as specified in supplier control plan. * Full-cast (or loose) Brake Rotor A rotor that is cast separately from the hub. It consists of the brake plate (or plates) and a “hat“ used to mount onto the hub. * Uni
12、cast Brake Rotor A casting that includes the brake rotor, hub and wheel bearing. 3.3 TENSILE STRENGTH E1: 207 MPa, min (ASTM A48/ASTM E8M/ISO 6892) E2, E3, E4: 150 MPa, min Mechanical properties of finished components may differ from separately cast test bars due to section size and foundry practice
13、. Preferred sampling method is from component casting. Component castings or separately cast tensile test bars may be used in accordance with the above standard. Separately cast test bars shall be processed and cooled from the same mold shakeout temperature and cooling rate as the castings they repr
14、esent. If tensile strength is determined from separately cast bars or other Materials Engineering-approved method, a correlation study must be conducted to determine relationship with component castings. Frequency of test bar sampling shall be as specified in the supplier control plan. 3.4 HARDNESS
15、(As Cast or Finished Components) E1: 187 241 HBW (ISO 6506/ASTM E10) E2, E3, E4: 149 229 HBW Hardness measured on one part can vary maximum 20 HB. Hardness to be measured on both machined friction surfaces, 4 times every 90 in the middle between inner and outer friction ring diameter 3.5 MICROSTRUCT
16、URE (ASTM A247) The microstructure shall consist of types “A” graphite of size 3 5 predominantly (shares of 2 and 6 are allowed, to be quantified on drawing), in a pearlitic matrix, with a maximum of 5% free ferrite. A region next to cast surfaces and outer diameter containing type “D” graphite is p
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