| High speed machining technology is one of the important basic technology in advanced manufacturing field, has been widely used in the manufacturing process of the automobile engine cylinder block. Guarantee the accuracy of the engine cylinder block is in the premise of high speed machining, and there are many factors that affect processing precision such as processing parameters, machine tool rigidity, machine tool vibration, etc.In view of the manufacturing process of cylinder block, in order to improve the machining precision of high speed milling process for the purpose of correlation analysis, specific content as follows:First of all, the machining process of the engine cylinder block was analyzed. Domestic brand car’s E type engine cylinder block as the research object, this paper introduced the structure characteristics of the cylinder block, determined the processing technical require-ments and processing mode, focused on the roughing and semi-finishing technology are analyzed in machining process, and discussed the application of high speed cutting technol-ogy and the cutting tool temperature field, stress field and the research necessity of cutting stability.Secondly, based on high speed milling process of engine cylinder block, some related technology was researched in the way of finite element simulation analysis. High speed cut-ting process of engine cylinder body was simplified to two-dimensional orthogonal cutting model, and parameters of constitutive model were determined based on the existing material data of ADC12.The key problems in the process of finite element analysis were discussed, established the chip separation criteria, contact friction model and heat conduction model. And put forward finite element analysis of steady state analysis method on the basis of the transient simulation.Thirdly, the two-dimensional simulation results of engine cylinder block high speed cut-ting were analyzed and compared with the test results. The optimal cutting speed and feed were analyzed. Engine cylinder block material cutting with carbide tools under different pa-rameters of steady temperature field changes and the change of stress field were discussed. In order to improve tool life and guarantee the machining precision, the optimal cutting speed and feed were achieved based on the results. Tests of high speed milling cylinder block mate-rial were made, the cutting force data were compared with the simulation data, verified the accuracy and rationality of the simulation. Finally, stability of high speed milling engine cylinder block process was researched and the optimal cutting depth was achieved.The model of transient force and multi-tooth dynamic force and dynamic model of the system were made.Based on the cutting tool system modal test and cutting force test, stable domain curve was achieved. The influence of many factors on the stability was analyzed, and the optimal cutting depth was determined. |
