底辊轻量化实用设计中减重孔临界开孔率的研究及其应用  

Research and Application on Critical Opening Rate of Weight Reduction Holes in the Lightweight and Practical Design of Bottom Roll

作　　者：毛思诺 林松[1] 江竞宇 房殿君 MAO Sinuo;LIN Song;JIANG Jingyu;FANG Dianjun(School of Mechanical Engineering,Tongji University,Shanghai 201804,China;Qingdao Sino-German Institute of Intelligent Technologies,Qingdao,266000,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]青岛中德智能技术研究院,山东青岛266000

出　　处：《机械》2023年第5期1-7,64,共8页Machinery

基　　金：国家重点研发计划(2022YFE0114300)。

摘　　要：根据辊切设备的运动特性,提取了底辊的轴向转动惯量和转子质量作为轻量化评价指标。针对拓扑优化结构的不可加工问题,使用B样条曲线和多段弧线依次对原拓扑结构进行结构圆整处理,降低原轻量化结构的加工难度。针对需要深孔加工的棒状、柱状零件提出转子类结构的开孔率表征参数。通过对不同孔数、孔径、孔位置的转子开孔与其应力分布关系的研究,给出惯性载荷下转子开孔率与应力集中系数的关系式。通过粒子群优化算法对基于单级减重孔的轻量化方案进行迭代优化。结果表明:样条拟合方案减重率34.68%,性能提升率19.85%;分段曲线拟合方案减重率34.18%,性能提升率19.27%;组合孔方案减重率28.21%,性能提升率15.45%;基于目标优化的单级孔方案减重率29.28%,性能提升率16.02%。Based on the motion characteristics of the roll cutting equipment,the rotational inertia and mass of the bottom roll are extracted as the lightweight evaluation indicators.For the non-machinability problem of the topology-optimized structure,structural rounding is performed on the original topology structure using B-sample curves and multi-segment arcs sequentially to reduce the machining difficulty of the original lightweight structure.The characterization parameters of the opening rate of the rotor-like structure are proposed for the bar and column parts that require deep hole processing.By studying the relationship between rotor opening and its stress distribution for different number of holes,hole diameters and hole locations,the relationship between rotor opening rate and stress concentration coefficient under inertial load is developed.The iterative optimization of the lightweight scheme based on single-stage weight-reducing holes is carried out by particle swarm optimization algorithm.The results show that the weight reduction rate of the spline fitting scheme is 34.68%with 19.85%performance improvement;the weight reduction rate of the segmented curve fitting scheme is 34.18%with 19.27%performance improvement;the weight reduction rate of the combined bore scheme is 28.21%with 15.45%performance improvement;the weight reduction rate of the single-stage bore scheme based on objective optimization is 29.28%with 16.02%performance improvement.

关 键 词：轻量化结构 拓扑结构设计 模型后处理 应力集中 

分 类 号：TH114[机械工程—机械设计及理论]