Research On Cutting Characteristics Of Precipitation Hardened Stainless Steel In High Speed Milling

15-5PH precipitation hardened stainless steel with its excellent properties,in aerospace,medical equipment and other fields have a wide range of applications.But the material is also difficult to process,in the process of machining,easy to appear high cutting temperature and tool wear too fast phenomenon,resulting in a decline in processing quality and efficiency,while processing costs rise.Therefore,it is of great significance to study the cutting characteristics of 15-5PH precipitation-hardened stainless steel and optimize the parameters to improve the machining efficiency and quality and reduce the production cost.Aiming at the above processing requirements,firstly,based on Deform-3D software,a milling simulation model was established,motion parameters were set,orthogonal milling motion simulation was carried out,and the rationality of the simulation model was verified by experiments,and the influence law and significance of each cutting parameters on the cutting force were analyzed by the range method.The influence degree relation of cutting parameters on cutting force is obtained.The results show that each tooth feed has the deepest influence on cutting force Fx and Fy,while radial cutting depth has the greatest influence on cutting force Fz.Combined with the simulation and experiment,the rule of how the cutting parameters affect the change of cutting force is summarized and the causes are analyzed.Then,through the single factor simulation study in the process of milling precipitation hardened stainless steel 15-5PH,under different cutting conditions of tool wear change law,and through the experiment study in the cutting path length constantly changing,the change of tool wear degree.By energy spectrum analysis,it is observed that the tool wear area contains Cr,Cu and Si elements from the workpiece.By comparison,it is found that with the peeling of the coating,the tool wear is further deepened,and the element content from the workpiece also increases in the tool wear area.Finally,with spindle speed,feed speed,axial depth of cut and radial depth of cut as optimization Design variables,and cutting force,surface roughness and material removal rate as response performance indexes,Box-Behnken was used to design a curved surface response method scheme,and a response analysis model was established using Design-Expert software.The influence law of the interaction between cutting parameters on the optimization objective was studied.The optimal combination of reducing cutting force and roughness and improving cutting efficiency is obtained under the condition of high speed milling precipitation hardening stainless steel.