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本文介绍了用60DTi,70DTi低淬透性钢制造的内燃机车齿轮性能及生产应用效果。用圆筒式单圈感应器,8000Hz中频电源,以较慢的加热速度(比功率为0.3～0.5kW/cm~2)将模数m=7～12的齿轮加热到830～850℃,随即以极大的冷速(约1000℃/s)淬火,可获得近似齿廓的硬化层,表面硬度可达HRC 65(180～200℃回火后HRC60～64),硬度梯度平缓,残余应力分布合理,静弯强度和脉动弯曲疲劳性能与20CrMnMo钢渗碳相近,并且有良好的冷热加工性能。用低淬透性钢代替渗碳钢制造齿轮,不仅简化工艺、缩短工时、生产效率高,而且材料费用低,经济效益明显。
This paper describes the gear performance and production and application results of diesel locomotives made of 60DTi and 70DTi low hardenability steel. With a cylindrical single-turn sensor, 8000Hz IF power supply, the gear with modulus m = 7 ~ 12 is heated to 830 ~ 850 ℃ at a slower heating rate (specific power of 0.3 ~ 0.5kW / cm ~ 2) Quenching at a very high cooling rate (about 1000 ° C / s) results in a hardened layer of approximately tooth profile with a surface hardness of HRC 65 (HRC 60-64 after tempering at 180-200 ° C), a gentle hardness gradient and a residual stress distribution Reasonable, static bending strength and pulsation bending fatigue properties and 20CrMnMo steel carburizing similar, and has good hot and cold processing performance. The use of low hardenability steel instead of carburizing steel gear manufacturing, not only simplify the process, shorten the working hours, high production efficiency, and low cost of materials, significant economic benefits.