Diesel Gear Gear Salt Bath Soft Nitriding Process

Through analyzing actuality and present problems of transmission gear on diesel engine, educed the significations of selecting subject. Due to structure peculiarity, design principle, failure form and worn examples, pointed a better method to delay fatigue life of gear surface. After researching hardening technology of gears surface, selecting soft nitrding treatment technology in fused salt. Through direct cross testing method, optimized a better treatment technology. At moment calculating fatigue life of intermediate gears after they were treated by soft nitriding treating technology, compared to testing results and found relation between theory calculation values and fatigue testing. This subject offered a theory basis for delay fatigue life of soft nitriding gears, and did technological prepare for locomotive of loading the gears running on railway.The testing results make know: a) soft nitriding treating technology in fused salt had advantages in following: its treating temperature is lower, time is short, operating is sample, no need machining after treating; b) after treating hardly deform, were to suitable surface hardness and grads, increased wearable peculiarity, corrode-resistant characteristic and fatigue intensity, may use to strengthen surface of gears; c) though reliability design for gear surface after soft nitriding in fused salt, the fatigue life of gear was increased observably.