| The hydraulic valve block is the core component of the integrated hydraulic system.In the hydraulic system,the hydraulic valve block is not only a mounting member for hydraulic components such as hydraulic valves and pipe joints,etc.,but also a connecting member for the oil passage.The hydraulic valve block has the advantages of compact structure,convenient installation and maintenance,less leakage,and low vibration.It is widely used in aerospace,engineering machinery,automobile manufacturing and other fields,and promotes the development of hydraulic systems to a highly integrated and modular direction.However,in practical use,it is found that the hydraulic valve block has problems such as wasted materials,long manufacturing cycle,serious energy loss and leakage.Based on above-mentioned existing problems,the thesis studies the method of reducing energy loss and provides a theoretical basis for the optimization design of hydraulic valve blocks.For additive manufacturing technology,the internal design of the hydraulic valve block is optimized to reduce energy loss,unnecessary auxiliary drilling and potential liquid leakage problems are solved,which shorten the time of manufacturing.In the meantime,it is more suitable for the production of customization complex hydraulic valve block.The topology optimization method is applied to lightweight design of hydraulic valve block,in order to save resources and reduce energy consumption.The main research contents of this thesis are as follows:(1)According to the valve block design principle,the hydraulic system valve block of the punching machine was designed,and the SolidWorks is used to establish the three-dimensional model of the hydraulic valve block.In order to analyze the main reasons for the partial pressure loss,the Fluent simulation software is used to simulate the typical holes in the hydraulic valve block.According to the main reasons,measures to reduce the local pressure loss are proposed to improve the energy utilization rate of the hydraulic system.(2)Based on additive manufacturing technology,the internal passages of the hydraulic valve block were optimized,which achieves self-supporting of the passages,reduction of the support material and solve the problem that the support material cannot remove.The effect of surface roughness of the SLM forming on pressure loss was analyzed.The pressure loss of each channel for oiling before and after optimization of the hydraulic valve block was calculated and compared.(3)First,a hydraulic valve block finite element model was established.Secondly,the topology optimization design area and non-design area were divided.Third,the model material was defined.Fourth,the hydraulic valve block load boundary conditions were calculated and analyzed.Fifth,the design variables and constraints were defined.Sixth,the minimum strain energy was used as the optimization target.Then the compromise planning method was applied to the definition of multi-objective topology optimization evaluation function.Finally,the multi-objective topology optimization design of the hydraulic valve block was carried out by SIMP continuum structure topology optimization method.(4)The static simulation of the topology optimization conceptual model was carried out to analyze the reasons why the model does not meet the design criteria.The 3-Matic software was used to repair,smooth,thicken and re-mesh the conceptual model to obtain a hydraulic valve block reconstruction model.Static analysis was performed on the reconstructed model to verify whether the results meet the strength and lightweight design requirements. |
