Analysis of static and dynamic characteristics and structural optimization of the SX325 swiss-type CNC lathe
WANG Shiqiang
SUN Qun
YAN Shige
SHENG Liwei
XU Longkun
Abstract：This study focuses on the SX325 sliding-headstock CNC lathe,with systematic analysis conduc-ted on the ANSYS Workbench platform.A finite element model of the machine was established,and cut-ting forces under turning,milling,and drilling conditions were calculated.Static simulation was per-formed to obtain contour plots of displacement and stress distribution for the entire machine under three typical machining states.Modal analysis identified the first six natural frequencies and corresponding dom-inant mode shapes of the machine.By integrating static and dynamic characteristic analysis,weak struc-tural areas were identified,including the tool post,the Y1-axis slide,and the X2-axis slide.Structural op-timization of the X2 slide was carried out using response surface methodology,resulting in a 5.27%reduc-tion in mass,a 0.96%decrease in maximum deformation,a 6.13%reduction in maximum stress,and a 3.12%increase in the first natural frequency.Furthermore,three stiffening ribs were added to key areas of the tool post—specifically,at load transfer paths and vibration-sensitive locations—to enhance its de-sign.This modification reduced maximum deformation by 6.04%,lowered maximum stress by 1.69%,and increased the first natural frequency by 2.83%.
Keywords：swiss-type CNC lathefinite element analysis static-dynamic characteristicsstructural optimi-zation
Publication Date：2026-08-25
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：11( 508-517,534 )