Modernization the sand system in electric-diesel locomotive

locomotive wheel slip in railway transport is a very actual problem for operation process especially on the main tracks and tracks between industrial oil company and power- generating stations, which always need to supply by oil products. This research included the conclusion of the reasons leading to the occurrence of the event wheel slip as well as study the technical reality of the work of sand management system in the locomotives and conduct analyzes and assessments of the substance sand used to overcome such situation with the suggestion of suitable alternatives to raise the adhesion coefficient between the railway wheels and improve an operating circumstances animation tools Line. Other causes include the contact of oil with the flanges and rims of wheels, which reduces adhesion with the surface of the rails, and a general loss of traction on steep gradients when pulling heavy loads.

Using New Chemical Materials as Coating Layers for Minimizing Friction and Wear

This study deals with the friction and wear behavior of coating layers (fluoride and Graphite).The coatings are thermally sprayed on cast iron disks. Sliding is performed between cylindrical pins manufactured from organic brake linings and the coated and uncoated disks. The coatings are characterized by measuring their hardness, porosity, and corrosion resistance. The corrosion resistance of the coating is tested by exposure to Nacl for 150 hours; the coating layer has had the best corrosion resistance. The friction and wear tests are conducted under contact pressures of (1.5 MPa to 7 MPa) and sliding speeds of 1 and 3 m/sec.