炮塔拆装台架变径设计与目标交互优化

为解决现役各种自行火炮炮塔拆装台架通用性差、种类冗杂的问题,通过分析其尺寸需求,设计了一种变径炮塔拆装台架,为实现拆装台架的轻量化设计并提高台架刚强度,提出了拓扑优化和尺寸优化相结合的目标交互优化设计方法.首先,以台架最易发生破坏的托盘质量最小为优化目标,最大许用位移、许用应力为约束条件,单元密度为设计变量,对托盘进行拓扑优化;然后,对拓扑优化结果进行规整,以提高刚强度为优化目标,质量不增加为约束条件,重要尺寸参数为设计变量,对托盘进行尺寸优化.结果表明,优化后托盘质量由1 421kg减为1 032kg,结构刚强度均有较大幅度提高,并通过工装试验验证了优化结果的有效性.

一种可变径刮蜡器的设计与研究

介绍一种电泵井用可变径刮蜡器,采用四连杆机构实现刮蜡器的级差式变径设计,利用钢丝绞车上提组合刮蜡器,实现360°范围的分级分层清蜡,解决了原下行清蜡工艺存在的下入困难、刮削效率低、工人劳动强度大等问题。现场应用取得了较好的效果,为电泵井提供了一套全新的高效机械清蜡工艺技术。

Influence of radial forging process on strain inhomogeneity of hollow gear shaft using finite element method and orthogonal design

Due to the current trend towards lightweight design in automotive industry,hollow stepped gear shafts for automobile and its radial forging process are widely investigated.Utilizing coupled finite element thermo-mechanical model,radial forging process of a hollow stepped gear shaft for automobile was simulated.The optimal combination of three process parameters including initial temperature,rotation rate and radial reduction was also selected using orthogonal design method.To examine the strain inhomogeneity of the forging workpiece,the strain inhomogeneity factor was introduced.The results reveal that the maximum effective strain and the minimum effective strain appeared in the outermost and innermost zones of different cross sections for the hollow stepped gear shaft,respectively.Optimal forging parameters are determined as a combination of initial temperature of 780°C,rotation rate of 21°/stroke and radial reduction of 3 mm.