Development Of Parametric CAE System For Ultrahigh Pressure Parts Of Water Cutting Machine

The ultrahigh pressure system is the core component of the water cutting machine,and its internal parts are subjected to alternating high-pressure water impacts,resulting in a series of frequent failure problems,which in turn affects the operation state of the entire water cutting machine.Therefore,it is necessary to carry out basic dynamic analysis,static analysis,self-reinforcement design,fatigue analysis and optimization design for these parts.These parts have the characteristics of serialization,their structures and working conditions are relatively fixed,but the sizes are slightly different.According to these features,this paper develops a dedicated parameterized CAE system for the parts,which enables enterprises to quickly finish the variant design.The system can save a lot of repetitive artificial modeling and analysis work,and its internal database can centrally manage all design examples,which is convenient for users to query and refer to previous design experience,while also improving design efficiency.The research objects of this article are six key parts of Nanjing Dadi Waterjet DIPS9-3040 ultrahigh pressure system,which are high pressure cylinder,cylinder head,end cover,check valve,switch valve and accumulator.The main work of this article is as follows:(1)Based on the working environment of the parts and their actual failure forms,the relevant analyses and optimization contents are determined.Based on these contents,the analysis objectives of the design system are determined,and the overall architecture,functional modules and related development tools of the system are established.(2)Based on the structure and working conditions of these parts,the finite element models and the corresponding parameterization schemes are both established.Based on these schemes,the APDL command stream files for parametric modeling and analysis are designed.According to the failure mode and the improvement needs of the parts,the optimization schemes of these parts are determined,and the corresponding APDL files of optimization are also designed.Based on these APDL files,three types of APDL templates(pre-processing,solving and post-processing,and optimized design)are designed to be called in the relevant modules of the system to realize the connection between each other.(3)In the Visual Studio IDE environment,the Winform is used to develop the interface of the software system.The class of each part is designed by C# program language,which is used to encapsulate the parameters of the structure,mechanics,analysis results and other related contents.Based on the system's functional requirements and its work flow,the programming logic and the functional modules are determined,and the CAE system for ultrahigh pressure parts of water cutting machine is developed finally.According to the characteristics of information such as geometric parameters,load values,material properties and calculation results of the parts,the corresponding databases and tables are established in MySQL Database to store data,and this Database is integrated into the retrieval module of the system to ensure that users can easily query and read data.(4)According to the CAE system developed in the paper,the example calculations are carried out to verify the feasibility of this system.Finally,based on the analyses of the system,the dynamic and static analysis results of the existing parts are given.As a result,the autofrettage scheme of the high pressure containers and the structural optimization scheme of other parts are also given.