A study on maintenance free method for bogie of the freight

초록

There are 13,000 freight cars in korea. As there are many wear parts, the cost of maintenance is high. Also there are many problems to change the wear plates. In case of welded structure bogie, wear plates are attached 30 positions. Especially, the occurrence of the wear quantity at the side of axle box is higher than any other wear plates. Wear parts needs the low wear and high strength. But the repeated load of carbody has acted on wear parts up down direction continually, the friction force defects at their surfaces. At present, the life of wear plates at the side of axle box is about 3~4 years. So we need the new development of wear plate over ten years life to improve the durability. Main dimension of the conventional wear plate is 4.5mm thickness, SM45C material, high frequency tempering surface. The research direction of the development is two. First is various surface tempering for high hardness and low wear quantity at the condition of friction each other. Among many surface tempering methods we will choice carbonizing, induction hardening, amorphous coating. Second is various material adoption about steel and composition. There are many combination tests for the optimum development. Many tests for the various material, various surface tempering method are going on to check the wear quantity and hardness each other.

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