NC Machining Process Analysis And Simulation Optimization For Bed Of Horizontal Machining Center

Large and high-precision horizontal machining center is a type of machine tool with high market demand,playing a major role in the machining of critical parts in key industries such as military,aerospace,automobile,mold and machinery manufacturing.The research and development of key parts technology for large horizontal machining is of great significance to promote development of China's equipment manufacturing industry.In recent years,with the continuous progress and development of the above industries,the demand of large horizontal machining centers is increasing year by year,however,the traditional processing method of large key parts is inefficient.it is urgent to improve the processing method and way to increase the machining efficiency.Therefore,the optimization of cutting parameters and machining program through virtual simulation is the future development direction of machining.This project comes from the transformation project(BA2014004)of Jiangsu provincial science and technology achievement and the key laboratory construction project of Qinghai Province.This paper takes the bed machining of large horizontal machining center-MDH80F made by Suzhou Jiangyuan precision machinery co.,LTD.as the research object,reasonably arranges the process route,and optimizes the cutting parameters through numerical control machining simulation to improve the cutting efficiency.The bed machining needs milling and grinding processes,due to it will take 66%of its machining cycle by a portal milling center during the process for its big cutting output,and also the process is complex and requires multiple clamping and overturn,so the milling process,the author of this paper has carried on the virtual machine tool modeling,CNC simulation of the bed and machining parameters optimization work,solve the difficult for the company,so to improve machining efficiency.The milling equipment is a portal milling center with movable beam(XH2130),which is a heavy machine.Firstly,the VERICUT software is used to establish the virtual CNC machine tool in this paper,and then the UG software is used to simulate the part NC machining.The right angle head of the accessory head is post-processed,and the program and cutting parameters are optimized by equal volume and equal thickness.Finally,compared with the actual processing,the result shows that the optimized NC program has a significant improvement in processing efficiency.The main contents of this article are as follows:(1)According to the processing characteristics of the part and the existing tooling equipment,combined with the production methods of single and small batches of components,work out the process procedure and set out the processing route.The portal milling process is determined to be the focus and difficulty of processing.(2)Numerical control machining simulation based on CAD/CAM software.For the bed of the horizontal machining center-MCH80F that needs to be machined,the UG software is used to complete the part modeling,process setting,tool magazine building,NC program generation,tool path generation and accessory head post processing,and lead into the virtual machine tool through the interface,complete the virtual simulation processing.(3)Modeling of virtual machine tools.The large-scale CNC portal machining center with moveable beam is used for the prototype to model the virtual machine tool.Using VERICUT software to create a model,and attach a head to regenerate the virtual machine tool for simulation software based on the existing 3D model.(4)Optimization of CNC machining program.Optimized program and cutting parameters by optimizing tool feed rate and spindle speed by two optimization methods,equal volume and equal cutting thickness.Simulation studies were carried out on collision interference and overcutting during processing.Optimize the machining program and compare it with the traditional manufacturing method to verify the machining efficiency.(5)Cutting processing experiments and tests.Introduce the optimized program into the XH2130 machine tool,configure the tool and fixture,perform on-site actual cutting for the bed part of the horizontal machining center,record the actual cutting time of each process,and compare it with the simulation processing time.Test the flatness,straightness,parallelism,dimensional tolerance and roughness in the horizontal plane and vertical plane of the machined surface of the bed and compared with the process requirements.The research results show that the overall working efficiency has been improved 24%in theory after the processing of virtual machine tool simulation and the program optimized,the actual overall working efficiency promoted 23%through actual cutting verification,the geometrical tolerance and roughness meet the technical requirements.