Research On The Machining Precision Control Technology Of Complex Structural Parts Of Logistics Equipment

Logistics equipment is an important part of modern logistics technology.With the rapid development of vehicle and other logistics vehicle industry,the demand of logistics equipment is increasing in use environment,operating conditions,diversification of customer consumption and government policy.As the key components of the logistics equipment in the vehicle,aviation and aerospace industry,the performance of the parts,such as the engine and the impeller,has a direct impact on the performance and safety grade of the vehicle and the aircraft.For these complex parts,machining accuracy and processing quality are often very demanding.However,in the actual processing process,these complex components are low stiffness and poor rigidity,so in milling,these parts are easily affected by the integrated factors such as clamping force,milling force and machining path and so on,resulting in the reduction of machining precision.In this paper,through the combination of theoretical model,simulation and scientific experiment,the problems related to machining deformation and machining precision of complex structural parts of logistics equipment are studied.The main contents are as follows:(1)The contact model of the plane fixture components and the complex structural parts of the logistics equipment is established.The equilibrium conditions and the conditions of stability are analyzed.The static and dynamic models of the complex structure parts and the clamping system are established.The finite element simulation of the clamping deformation and dynamic machining deformation of complex structural parts is studied by using the ABAQUS.The material is set by the JC constitutive model.A simple grid modeling and milling force is set up to apply the InP file generator by VB,which improves the flexibility of the grid division and facilitates the application of the milling force.Using the element deletion method to simulate the removal of the workpiece material,the maximum milling forces in the three directions are applied to each discrete element to simulate the milling force in the process.The effect of clamping layout and clamping force on the machining deformation of the workpiece is studied by the finite element model,and the influence of the clamping layout and clamping force on the deformation of the model is obtained.Through the DY850 machining center,we use the Kislter9257 B dynamometer and the machining distortion online measurement system to do the milling test.The real-time deformation of machining points in real-time measurement is in good agreement with the simulation results.(2)The influence of four milling paths and milling parameters on the machining accuracy of complex parts of logistics equipment is studied.Four kinds of milling paths are selected as the research scheme,and the effect of four kinds of machining paths on the machining deformation of the simplified model plate structure is tested.The Mitutoyo contact three coordinate measuring instrument,Crysta-plus M544,is manually measured,and three machining positions of each flat panel are selected respectively.Measurement of processing deformation.Through the analysis of the test results,the law of four kinds of machining paths and the influence of the different spindle speed,feed speed,and the single factor of milling depth on the machining deformation and machining precision of the complex structural partsare obtained..(3)The influence of curvature on the surface residual height of complex parts with small surface is studied.Firstly,the differential geometric features and the residual height of the surface are modeled.Secondly,two different processing paths are selected.Through simulation programming of milling machining,the two processing paths are simulated.The results of the surface residual height are obtained and the advantages and disadvantages of the two paths are analyzed.Finally,through scientific experiments,the results are obtained.The influence of curvature on the surface residual height of complex parts with small surface is simulated,and the simulation model is verified.