Mobile Machine Design And Process Experimental Research For Large Flange Machining

Some large tank containers are commonly manufactured in sections and transported to the equipment installation site for welding.The flatness of the can flange is degraded due to welding heat deformation,resulting in poor sealing of the container.Therefore,it is necessary to finish the post-welding flange face.The apparatus currently used is a twoaxis machine tool fixed at a rotary truss,milling,grinding and polishing flanges in the circumferential direction.It is difficult to install and adjust the apparatus,which has low degree of automation.In addition,its overall reliability is poor,whit a small processing range.As the application of various large-scale equipment nowadays,the diameter of flanges to be processed is continuously increasing.The original equipment and processes can no longer meet the current processing requirements.Based on the idea of "Using macro machine tool to process large-scale components",combing the advanced technology of large-scale workpiece processing,and practical engineering needs,this thesis proposes a set of large-scale flange on-site processing solutions that has engineering feasibility.A flatness error model is established for splicing processing of flange end faces.In this thesis,a mobile machine used for on-site machining of large flanges is designed.The machine has milling,grinding and automatic measurement functions,controlled by an open CNC system based on motion control cards.After designing,calculating and selecting the key components of the machine tool,a 3-D assembly model of the machine body mechanism is established.The finite element analysis software is used to analyze the static and dynamic performance of the machine tool.Based on the analysis results,the machine tool structure is optimized,the geometric accuracy of the machine tool is improved,and some suggestion about the machine tool manufacturing and application are proposed to avoid machine vibration.Finally,process experiments are implemented to verify the feasibility and reliability of key process steps.Based on the statistical experiment method,the prediction of the actual machining error is made and verified.With the prediction and experimental experience,some improvements of the key operation are proposed to guide the actual processing.