转子数控车床静压支承系统研究与控制

Research and Control of Static Pressure Support System for Rotor Numerical Control Lathe

汽轮机转子数控车床静压支承系统一直存在校调困难的问题,尤其是供油压力及油膜厚度的控制仅凭经验操作,缺乏理论依据。通过对转子数控车床静压轴瓦油膜特性的分析,推导了静压轴瓦油膜厚度及油泵供油压力的理论计算公式,运用有限元仿真软件计算了转子精车加工时所需的静压支承力。计算结果在1 000MW超超临界低压转子加工现场进行了验证,验证结果表明该理论计算方法是准确、有效的。该研究成果将用于指导新产品的现场装夹作业,消除因装夹不当而产生的挠度变形,提高车削加工精度。

It is constantly difficult for turbine rotor numerical control lathe to calibrate the static pressure support system, especially, the control of oil supply pressure and oil film thickness is conducted only with experience of machine operators instead of theoretical foundation. Based on characteristic analysis of the static pressure bearing’s oil film, the theoretical calculation formulae of oil film thickness and oil supply pressure were derived, and the static pressure support force in the rotor turning process was calculated using finite element simulation software. The calculation results were verified on manufacturing site of 1 000 MW ultra supercritical unit low pressure rotor, and this theoretical calculation method was proved to be accurate and effective. This research result will be used as guidelines for new products to eliminate the deflection deformation caused by clamping and improve turning accuracy.