HYDROSTATIC PRESSURE CALCULATION AND OPTIMIZATION FOR DESIGN OF BEAM ＆ SLIDE-REST GUIDEWAYS IN HEAVY DUTY CNC VERTICAL TURNING MILL

摘要

＜正＞Aiming at the approximate error of commonly used methods on calculation of hydrostatic pressures of closed hydrostatic guideways with multiple pockets,a more accurate solution is pro- posed.Taking design of beam ＆ slide-rest guideways for a heavy duty CNC vertical turning mill as an example,under an assumption that stiffnesses of guideways and their jointing structure are suffi- ciently large,the pressures of the pockets can be attained by adding a co-planarity equation that con- swains pocket centers.Then,an optimization model is built to minimize the highest pocket pressure under additional constraints that arc posed on the highest seal margin pressure,the highest levitating pressure of the pockets,and the maximum deformation of the guidcways.The optimization problem is solved sequentially by using the methods of design of expcriments and adaptive simulated annealing on iSIGHT soflwarc platform.The results show significant improvements to the original design.Op- timized maximum hydrostatic pressurc meets the requirement of hydraulic system.