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针对目前加工中心工作台在工作时,由于振动和变形产生刚度降低的问题,提出了一种结构优化方案,以验证优化后工作台刚度的可靠性。采用有限元法,在静力学分析的基础上对工作台进行了不增加质量而提高刚度的优化;采用灵敏度分析法对优化后工作台的刚度可靠性进行分析;在six sigma分析系统中验证了优化后工作台的刚度可靠度。分析结果表明:优化后工作台的刚度提高11.5%,且可靠度达到100%,其中弹性模量及工作台圆形筋板厚度的随机变化对工作台刚度影响较大。该方案能提高加工中心工作台的刚度并且能确保其刚度可靠性。
Aiming at the problem that the workbench of the machining center is working at present, due to the problem of the rigidity decreasing due to vibration and deformation, a structure optimization scheme is proposed to verify the reliability of the optimized workbench stiffness. The finite element method was used to optimize the workbench without increasing the mass and the rigidity on the basis of the static analysis. The stiffness reliability of the optimized workbench was analyzed by using the sensitivity analysis method. In the six sigma analysis system, Optimized rigidity of the workbench reliability. The analysis results show that the rigidity of the optimized workbench increases by 11.5% and the reliability reaches 100%. The random variation of the elastic modulus and the circular plate thickness of the workbench greatly affects the rigidity of the worktable. The program can improve the rigidity of the workbench and ensure its rigidity and reliability.