共查询到20条相似文献,搜索用时 203 毫秒
1.
2.
分析了某厂冷轧机换辊过程中出现的换辊不畅问题的原因,并提出了对其轧辊平衡液压控制回路进行改进的方案。方案的实施有效解决了换辊过程中存在的问题,提高了生产效率,保证了生产和设备的稳定性。 相似文献
3.
本文结合液压差动控制回路工作原理,论述了液压差动控制技术在大连钢厂650mm二辊万能轧机轧辊液压平衡控制系统上的应用及特点。 相似文献
4.
5.
设计了一种立式穿孔机上轧辊平衡装置液压回路.此回路能够实现上轧辊平衡装置纵向锁紧,辊距调整时向上调整跟随、向下调整时安全溢流,检修以及换辊时的慢速卸荷以及快速提升工艺动作.同时,高压锁紧回路可解决因平衡装置滑道磨损而无法完全向上锁紧的问题. 相似文献
6.
7.
针对热轧2250生产线R2上工作辊倾斜事件,通过对接轴平衡液压控制回路的分析, 指出其存在的主要问题,提出了可行的技术改造方案。修改相应程序经应用证明,改造效果良好,彻底消除了上工作辊倾斜隐患,并创造了可观的经济效益。 相似文献
8.
9.
设计了一种Assel轧管机上机架翻转装置液压回路及其控制系统。此回路能够对负载压力和流量进行相应的补偿,并且能够自动增加系统回油背压,从而可以安全稳定地控制上机架翻转装置。同时,通过对上机架翻转装置的运动轨迹分析,得到了符合现场实际使用工况的流量控制方案,使上机架按照指令要求翻转,实现轧管机的换辊。 相似文献
10.
11.
12.
The effects of changing the rolling direction and of repeated loading on the rolling contact fatigue lives of annealed 0.45% carbon steel rollers and case-hardened nickel-chromium steel rollers under conditions of sliding rolling contact were studied. The influence of plastic flow in the subsurface layer on the rolling fatigue life was examined. The increase in the rolling fatigue life of an annealed steel roller due to a change in the rolling direction was significant, especially when the rolling direction was changed just before the formation of macroscopic surface cracks and pits. The effect with case-hardened steel rollers was negligible. The varying effects of changing the rolling direction on the rolling fatigue life were due to differences in work-hardening and the extent of plastic flow in the rollers. 相似文献
13.
介绍了在DS-30型闪光式动平衡机上,利用转子动平衡原理,通过更换电机和重新连接控制电路,对线切割机贮丝筒进行动平衡试验的方法。 相似文献
14.
提出圆锥滚子凸度贯穿式超精研修形加工的一种新型的锥柱匹配的导辊配置方式,其后导辊是圆柱形形面,可通用于不同型号的滚子;其前导辊采用匹配的专用螺旋锥形形面。对锥柱匹配导辊配置方式的滚子姿态进行简化分析表明,这是一种具有特定滚子姿态的斜置贯穿式超精研,可以获得凸度。依据共轭曲面原理建立斜置贯穿式超精研导辊的理想形面方程,通过数值计算分析锥柱匹配导辊形面和相应滚子姿态问题,结果表明,一般斜置贯穿式超精研前后导辊理想形面的轴向截形均为相对于导辊轴线倾斜的轻微内凹曲线,但存在特定的滚子姿态,可以使后导辊形面曲线不倾斜而只有轻微内凹;锥柱匹配导辊配置方式中,后导辊的圆柱面是近似形面,但其形状误差很小,一般不超过4 μm,对滚子的支撑稳定性影响不大。给出了锥柱匹配导辊配置方式中圆柱导辊形状误差、锥形导辊形面参数以及相应滚子姿态参数的精确计算方法。 相似文献
15.
Masanori Seki Masahiro Fujii Yuji Kobayashi Masaaki Sato Akira Yoshida 《Journal of Mechanical Science and Technology》2010,24(1):141-144
To investigate the influence of shot peening on the surface durability of powder-forged rollers, the case-hardened powder-forged
rollers with a forging density of 7.5 g/cm3 treated by the single shot peening and the double shot peening were fatigue-tested under a sliding-rolling contact condition.
The surface roughness, the surface hardness and the surface compressive residual stress of the rollers were increased by the
shot peening. In addition, the pores near the roller surface were deformed by the shot peening. The failure mode of all the
test rollers was spalling due to subsurface cracking. The fatigue lives of all the test rollers were improved by the shot
peening, and that of the test roller S08, which was shot-peened with the hardest steel shots in this experimental range, was
especially improved. The surface durability of the test roller S08 was also most improved by the shot peening. Cracks became
difficult to occur and propagate under the roller surface since the pores near the roller surface were deformed by the stronger
shot peening. In this study, double shot peening, which generally restrains the increase in surface roughness, was not particularly
effective for the improvement in the surface durability of the powder-forged rollers, because the influence of tangential
force on fatigue was not always great in a case of subsurface cracking. 相似文献
16.
17.
盛装锂电正极材料的匣钵在辊道窑烧结过程中极易出现异常横向运动,为此基于柔性动力学分析辊道柔性对传动过程匣钵运动特性的影响。首先,基于柔性动力学建立匣钵-辊道传动动力学简化模型,分析辊棒弹性变形及传送时匣钵运动特性,并通过实验验证了模型的有效性;其次,建立相应的匣钵-辊道刚体动力学模型,通过对比分析刚性和柔性两种辊棒传送条件下匣钵运动特性的变化以及不同辊棒挠度下匣钵横向运动的变化,揭示辊道柔性对匣钵运动特性的影响。在此基础上,对原有辊棒进行了改进并开展实验验证改进方案的效果。结果表明:由于弹性变形的影响,匣钵在前行的同时,匣钵之间间隙出现了明显向外扩张趋势,而当辊棒呈现刚性时匣钵则几乎无外扩现象;辊棒挠度对横向运动有重要影响,在辊棒挠度从0到2 mm区间变化时,其匣钵扩展间隙随挠度增加而呈增大趋势,而当辊棒挠度超过2 mm后,匣钵扩展间隙随挠度增加反而呈减小趋势。改进实验效果表明,适当增大辊棒刚度可显著减轻匣钵异常横向运动现象。 相似文献
18.
19.
铝板带材轧机振动测试分析 总被引:1,自引:2,他引:1
针对某铝板热轧机严重振动问题,测试了轧辊垂直振动、主传动系统扭振和液压压下系统压力与主电机电枢电流等参数,分析了其振动特点。采用拟三维有限元模型分析了同系统的固有特性。测试与分析表明,铝板热轧机振动的主要形式是强迫振动,主要振因来源于工作辊轴承和支承辊轴承特征振动。 相似文献