轮毂锻造机器人欠秩端拾器热-结构耦合分析及优化

Thermal-structural coupling analysis and optimization on under-rank end picker for hub forging robot

为了提高高温环境下轮毂锻造机器人欠秩端拾器夹持的有效性和承载性,对欠秩端拾器进行了热-结构耦合分析及结构优化。首先,基于有限元理论将欠秩端拾器所受热力载荷和静力载荷耦合,得到欠秩端拾器关键部件在耦合力场作用下的热应力分布及应力和应变结果;然后,根据所得热应力分布云图,对欠秩端拾器各指节进行隔热优化设计以及热-结构耦合分析;最后,根据隔热结构的等效应力结果进行了欠秩端拾器的拓扑结构优化。数值分析表明:相比优化前的结构,隔热优化后欠秩端拾器的首、中和末指节在参照节点处的温度分别降低了33.78%、50.42%和35.31%;拓扑优化后欠秩端拾器的首、中和末指节的质量分别减少了38.75%、18.63%和26.45%,实现了轮毂锻造机器人欠秩端拾器的耐高温及轻量化的优化目标。

In order to improve the effectiveness and load-bearing capacity of clamping for under-rank end picker of hub forging robot in high temperature environment, the thermal-structural coupling analysis and structural optimization of under-rank end picker were carried out. First, the thermal load and static load of under-rank end picker were coupled based on finite element theory, the thermal stress distribution and the stress and strain results of the key components for under-rank end picker under coupling force field were obtained. Then, according to the obtaimed thermal stress distribution nephogram, the thermal insulation optimization design and the thermal-structure coupling analysis of each finger joint for under-rank end picker were conducted. Finally, according to the equivalent stress results for thermal insulation structure, the topology structure optimization of under-rank end picker was conducted. The numerical analysis shows that compared with the structure before optimization, the temperatures at reference nodes of the first, middle and last knuckles for under-rank end picker after thermal insulation optimization are reduced by 33.78%, 50.42% and 35.31%, respectively, and the masses of the first, middle and last knuckles for under-rank end picker after topology optimization are reduced by 38.75%, 18.63% and 26.45%, respectively, which achieve the optimization objectives of high temperature resistance and lightweight for under-rank end picker of hub forging robot.