Investigation Of Mechanism In High Speed Machining Of 40CrNi2Si2MoVA Ultra High Strength Steel

The ultra high strength steel 40 CrNi2Si2MoVA is widely utilized in manufacturing aircraft landing gear and key stress components due to its high strength, high hardness, high toughness and excellent comprehensive performance. It is of great significance to improve the efficiency of cutting and processing and mechanical quality because of its poor processing performance such as big cutting force, high cutting temperature, serious tool wear, poor machining efficiency and difficulty of controlling the machined surface. In this paper, combining experiment and simulation to study the cutting force, the surface roughness and the wear of the cutting tools of the ultra high strength steel 40 Cr Ni2Si2Mo VA.Firstly, single factor experiment of the ultra high strength steel 40 Cr N i2Si2 Mo VA in the high speed milling is carried out to research the influence of cutting force and surface roughness under different cutting velocity, feed rate and axia l depth and cutting width. The prediction models of the cutting force and the surface roughness of the ultra high strength steel 40 Cr N i2Si2 Mo VA established with the orthogonal experiment method. Through the Poor analys is method, we found that feed rate and is the main factor of the surface roughness and axial depth is the main factor of the cutting force during high speed milling of the ultra high strength steel 40 Cr Ni2Si2Mo VA.Secondly, the orthogonal experiment was carried out to establish the prediction model of tools flank wear which was used as constraint condit ions for predict tool lifetime and optimize the cutting parameters. The effect of cutting velocity on tool wear was researched by the single factor experiment that the cutting speed is the single variable.Thirdly, through finite element simulation software Advantedged to simulate the milling process of 3D to research the stress distribution, cutting temperature, cutting force and chip during the process of cutting.Finally, Genetic algorithm is used for the establishing of cutting parameter optimization model. In the model, the milling parameters was as optimization variables, the minimum cutting force and maximum cutting e fficiency were as objective function. The cutting parameters of the cutting parameter optimization model ware used to provide a reference for practical production.