In order to improve the working performance of disc pelletizer,an optimization idea is presented to design the disc body for lightweitghting. The static stiffness and strength of the disc pelletizer is checked by utilizing ANSYS Workbench. The key parameter which affects its quality and maximum equivalent stress is got by the analysis of the sensitivity. By means of the Quadratic Response Surface method,the Disc body is lightweighting optimized and the calculation model is established considering the quality and the reliability of the maximum equivalent stress. Then the probability distribution of quality and the maximum equivalent stress can be got by using the Six Sigma Design criterion. Finally the reliability of the Disc body is got with the comparison before and after the optimazation. The result shows through the comparison of the structure before and after that:while the maximum equivalent stress is reduced by 10.88% and the static rigidity in the direction of the weak part is increased by 10.56%,there is still 16.35% reduction in its quality which a-chieves the purpose of lightweight,enhances its static stiffness and strength,increases its reliability by 7%, improves its performance and provides a theoretical basis and reference for optimization design.%为提高圆盘造球机的工作性能,提出一种对盘体进行轻量化优化思路.利用ANSYS Workbench对造球机的盘体进行静刚度和强度校核,通过灵敏度分析得到影响其质量和最大等效应力的关键参数,借助二次响应面法对盘体进行轻量化优化设计,并建立考虑质量和最大等效应力的可靠性计算模型,运用六西格玛设计准则得到其质量和最大等效应力的概率分布,得出优化前后盘体的可靠度.对优化前后的盘体结构进行比较,其结果表明:在最大等效应力降低10.88%,薄弱方向部位静刚度提升10.56%的同时,其质量下降16.35%,这既达到了轻量化的目的,又提升了其静刚度和强度,并且其可靠度提高了7%,使造球机的性能得到了改善,为其优化设计提供了理论依据和参考.
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