A Study of Modification of M2 Cast High Speed Steel

M2 cast high speed steel was inoculated by addition of rare earth(RE)‐Al‐N, network eutectic carbides were eliminated, matrix structures were refined and the segregation of tungsten and molybdenum elements were relieved. In the condition that the hardness did not decrease, impact toughness obviously increased. Quenching at 1180 °C and three‐times tempering at 560 °C, the hardness of M2 cast high speed steel kept 65~66HRC, impact toughness reached 21.3J/cm². Modified M2 cast high speed steel had excellent thermal fatigue resistance and high temperature wear resistance. Roll made in modified M2 cast high speed steel had excellent service effect using in slit rolling mill stand of hot rolling bar mill.     

宝钢宽厚板定尺剪主传动控制系统

主要介绍了宝钢5 m宽厚板剪切线中最后一台剪切装置一定尺剪的电气主传动控制方法.通过使用西门子交流调速系统,使得剪切位置控制准确,实现了最优化剪切.     

浅谈控制冷却技术在低碳钢轧制上的应用

控制轧制和控制冷却技术是近十余年来国内外新发展起来的轧钢生产新技术 ,有效地利用不同的控制冷却与控制轧制技术可进一步提高钢材的各种性能及附加值 ,节约成本 ,因此其受到国际冶金界的普遍重视。本文着重讨论了低碳钢高速线材进行控制冷却的原理及工业控制方法 ,以使低碳钢线材的性能达到用户所需要求。     

变频调速在氧化铝加料小车的应用

本介绍氧化铝加料小车采用变频调速技术的经验、节能效果及取得的经济效益。     

新型数控技术在鼓风机调速与保护系统中的应用

对邯钢1260m^3高炉风机机组原系统存在的问题进行了全面分析，采用新型数控技术进行改造，给出了详尽的改造方案，通过对其实际使用效果的说明，展示了其多处技术创新点和广阔的市场推广前景。     

薄板坯连铸二冷传热数学模型的研究

依据凝固传热理论建立数学模型，探讨了网格尺寸和时间步长对数值计算结果的影响。编制传热计算程序，分析不同拉速下铸坯的凝固状况，运用冶金准则对铸机原有水表进行了合理评价。     

UPS系统蓄电池部分调试经验

通过介绍蓄电池的主要技术指标，阐述了各电厂在运行和维修UPS电源时，科学使用UPS蓄电池、掌握测试和挑选UPS蓄电池的方法。     

动态神经网络自组织模糊控制在交流调速系统中的应用研究

利用动态神经网络所具有的并行处理、分布式信息存贮、自学习自适应的特点,实现了对结构复杂、干扰大且控制精度要求高的变频调速系统的控制.仿真结果表明,控制方法具有很强的自学习和抗干扰能力.与PID控制作对比研究的结果表明,神经模糊控制超调小、响应快、无静差、鲁棒性强,具有较好的动、静态品质.     

Effects of heat treatment on structures and properties of high speed steel rolls

The effects of quenching temperature, cooling pattern, temper temperature and temper times on the structure and properties of high speed steel (HSS) rolls have been investigated. The results show that, when the quenching temperature is lower than 1050℃ the hardness of HSS increases with the quenching temperature increasing in oil cooling, but when the quenching temperature exceeds 1100℃ the hardness decreases. In the conditions of salt bath cooling and air cooling, the effect of quenching temperature on the hardness is similar to the above law, but the quenching temperature obtaining the highest hardness is higher than that in oil cooling. When the temper temperature below 350℃ the hardness of HSS has a little change, when above 475℃ the hardness will increase with the temper temperature increasing, and the highest hardness is obtained at 525℃. When the temper temperature continues to increase, the hardness decreases. Twice temper has little effect on the hardness, but three times temper decreases the hardness. HSS in air cooling has lower hardenability, oil cooling can easily produce crackle, and HSS quenching in salt bath has high hardenability and excellent wear resistance.     

激光淬火技术在发动机大修中的应用

作者介绍了激光淬火提高气缸套耐磨性和使用寿命以及提高曲轴抗磨损、抗疲劳性的强化机理、激光处理工艺及方式、方法 ,讨论了激光淬火强化效果的影响 ,总结并分析了强化效果。结果表明 :在优化的工艺条件下 ,激光淬火不仅提高了气缸套和曲轴的耐磨性和抗疲劳性 ,而且还提高了其使用寿命 ,在发动机大修中应该得到大力提倡