Optimization Design of Hydraulic Valve Block and Its Internal Flow Channel Based on Additive Manufacturing

基于增材制造液压阀块及其内部流道优化设计

Hydraulic valve block is an important part of the hydraulic system.The traditional hydraulic valve block is made by turning and milling,drilling and boring,which leads to many right-angle bending and closed cavity structure of process holes in its internal flow channel,seriously affecting the flow performance of oil.Based on the new design space provided by additive manufacturing technology,the internal hydraulic flow channel of valve block is optimized by using B-spline curve.Computational fluid dynamics analysis is carried out on the hydraulic flow channel to determine the optimal flow channel structure with the smallest pressure drop.The weight reduction of hydraulic valve block is carried out through topology optimization.According to the results of topology optimization,using the method of selective laser melting(SLM),the printing of the hydraulic valve block is completed.The optimized hydraulic channel reduces the pressure loss by 31.4%compared with the traditional hydraulic channel.Compared with the traditional valve block,the hydraulic valve block manufactured by SLM with topology optimization reduces the weight by 33.9%.Therefore,the proposed flow channel optimization and valve block lightweight method provide a new reference for the performance improvement of the internal flow channel of hydraulic valve block and the overall lightweight design of valve block.

液压阀块是液压系统中重要的组成部分,传统液压阀块采用车铣、钻、镗的方式制造,导致其内部流道有较多直角弯和工艺孔封闭容腔结构,严重影响油液流动性能。基于增材制造技术所提供的新型设计空间,采用B样条曲线对阀块内部液压流道进行优化设计,并对液压流道进行了计算流体动力学分析,以确定压降最小的最优流道结构。通过对液压阀块拓扑优化进行减重,根据拓扑优化结果,采用选区激光熔融的方式,完成了液压阀块的打印。相比原始液压流道,经过优化后的液压流道的压力损失减少31.4%;与原始阀块相比经过拓扑优化并通过SLM制造的液压阀块减重33.9%。因此本文采用的流道优化和阀块轻量化方法为液压阀块内部流道性能提升和阀块整体轻量化设计提供了新的参考。