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针对20Cr Mo H齿轮材料应用在电动汽车和工程机械变速箱产品中的齿轮设计与制造问题,研究了锻造、热处理工艺对20Cr Mo H齿轮钢材料组织和力学性能的影响。通过锻造、预备热处理和渗碳淬火全过程的系统联动控制等工艺方法,对20Cr Mo H钢进行试验分析与研究。结果表明:将锻造比控制在4以内,且镦粗比≥1.5,拔长比≤2.5,可消除带状组织,有效改善材料组织和力学性能;选择正火温度区间为890~930℃,渗碳后直接淬火和二次淬火扩散碳势为0.70%~0.85%,强扩比为1∶1,可以得到良好的金相组织和力学性能,保证合理的硬度梯度分布,以满足20Cr Mo H钢的齿轮零件质量要求。
Aiming at the design and manufacture of gears in 20Cr MoH gears for gearbox applications in electric vehicles and construction machinery, the effects of forging and heat treatment on the microstructure and mechanical properties of 20Cr MoH gear steel were studied. Through the forging, pre-treatment and carburizing and quenching the whole process of the system linkage control and other processes, the 20Cr Mo H steel experimental analysis and research. The results show that when the forging ratio is controlled within 4, the upsetting ratio is ≥1.5 and the elongation ratio is less than or equal to 2.5, the ribbon structure can be eliminated and the microstructure and mechanical properties can be effectively improved. The normalizing temperature range is from 890 ℃ to 930 ℃, After carbon direct quenching and secondary quench diffusion carbon potential of 0.70% ~ 0.85%, strong expansion ratio of 1: 1, you can get a good microstructure and mechanical properties to ensure a reasonable hardness gradient distribution to meet the 20Cr Mo H steel Gear parts quality requirements.