For a heavy hydrostatic bearing with a high linear velocity, the results of numerical calculations often differ from practical conditions if the viscosity is considered as constant. In this article, the influence of t...For a heavy hydrostatic bearing with a high linear velocity, the results of numerical calculations often differ from practical conditions if the viscosity is considered as constant. In this article, the influence of the oil cavity depth on the temperature field in the heavy hydrostatic bearing is discussed in the context of variable viscosity. The viscosity-temperature relations for the gap oil film are first established by fitting B-Spline curves, then, numerical calculations for the temperature field in the heavy hydrostatic bearing of different oil cavity depths are carried out based on Finite Volume Method （FVM） under the same rotating speed, and the influence of the oil cavity depth on the temperature distribution in the gap oil film of the hydrostatic bearing is discussed. The results of numerical calculations provide the temperature distribution state inside the hydrostatic bearing, which would help the selection and the design of hydrostatic bearings in engineering practice.展开更多
为解决铝合金自动锻造生产线低温环境下脱模剂喷涂量过小甚至无法喷涂的问题,对喷涂失效原因进行了分析。介绍了铝合金自动锻造生产线喷涂系统的结构原理,构建了脱模剂的流体数学模型,分析了喷涂系统的各项参数对喷涂流量的影响。实验...为解决铝合金自动锻造生产线低温环境下脱模剂喷涂量过小甚至无法喷涂的问题,对喷涂失效原因进行了分析。介绍了铝合金自动锻造生产线喷涂系统的结构原理,构建了脱模剂的流体数学模型,分析了喷涂系统的各项参数对喷涂流量的影响。实验测量了不同温度下铝合金锻造专用HYKOGEEN AL 2931 MBA型号脱模剂的运动黏度,建立了黏温方程。计算得到了所研究的自动锻造生产线工艺条件下的脱模剂温度与喷涂流量的关系,揭示了喷涂失效的根本原因,为温度过低导致脱模剂运动黏度增大导致的。提出了应将脱模剂的温度控制在20℃以上,并针对生产线进行改进的措施,取得了良好的效果。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 50975066,51075106)the National Natural Science Funds for Young Scholars of China(Grant No. 51005063)
文摘For a heavy hydrostatic bearing with a high linear velocity, the results of numerical calculations often differ from practical conditions if the viscosity is considered as constant. In this article, the influence of the oil cavity depth on the temperature field in the heavy hydrostatic bearing is discussed in the context of variable viscosity. The viscosity-temperature relations for the gap oil film are first established by fitting B-Spline curves, then, numerical calculations for the temperature field in the heavy hydrostatic bearing of different oil cavity depths are carried out based on Finite Volume Method （FVM） under the same rotating speed, and the influence of the oil cavity depth on the temperature distribution in the gap oil film of the hydrostatic bearing is discussed. The results of numerical calculations provide the temperature distribution state inside the hydrostatic bearing, which would help the selection and the design of hydrostatic bearings in engineering practice.
文摘为解决铝合金自动锻造生产线低温环境下脱模剂喷涂量过小甚至无法喷涂的问题,对喷涂失效原因进行了分析。介绍了铝合金自动锻造生产线喷涂系统的结构原理,构建了脱模剂的流体数学模型,分析了喷涂系统的各项参数对喷涂流量的影响。实验测量了不同温度下铝合金锻造专用HYKOGEEN AL 2931 MBA型号脱模剂的运动黏度,建立了黏温方程。计算得到了所研究的自动锻造生产线工艺条件下的脱模剂温度与喷涂流量的关系,揭示了喷涂失效的根本原因,为温度过低导致脱模剂运动黏度增大导致的。提出了应将脱模剂的温度控制在20℃以上,并针对生产线进行改进的措施,取得了良好的效果。
