Geometric Design Of Insert Milling Cutter And Finite Element Analysis Of Tool Strength

Electric power is developing rapidly in our country.As one of the main sources of electric power in our country,hydropower has the advantage that it is a renewable and clean energy source,which has a small impact on the environment and is in line with domestic green,energy-saving and efficient development concepts.As an important organizational structure of hydroelectric power generation equipment,hydraulic turbines will also move towards high power and high parameters in the future.Its material Cr13Ni4 Mo has difficult processing characteristics such as high hardness,high tensile strength,and good corrosion resistance.Machining put forward higher requirements,and at the same time,it also puts forward extremely high precision requirements for the related tool manufacturing industry.The plunge milling process has great advantages for processing water turbine buckets,especially for curved surface machining and large overhang elongation.The performance of plunge milling tools directly affects machining efficiency,accuracy and quality,and plunge milling tools themselves are also easy.Cracks to failure due to insufficient strength.Therefore,the design of the insert milling cutter in this article is based on the strength of the tool and the characteristics of difficult-to-machine water bucket materials.The following aspects are studied:First,based on the theoretical analysis of the strength of the plunge milling tool,the tool material strength and fracture mechanism are studied,and the cutting force model and thermal stress model are established to provide a theoretical basis for the plunge milling tool design.Secondly,through the structure design and dimension parameter design of the plunge milling cutter,the three-dimensional plunge milling cutter model is established by UG software to complete the geometric structure design of the plunge cutter.Reasonable selection of cutting amount,provide parameters for plunge cutter cutting simulation,and analyze the effect of cutting amount on cutting force.Thirdly,the modal simulation analysis is carried out on the plunge milling cutter again,and its natural frequency and various vibration modes are obtained,which provides a basis for the cutting system to avoid resonance.Through the simulation analysis of the distribution of mechanical stress and thermal stress of the plunge cutter,the weakest and most easily damaged areas of the plunge cutter were obtained,and the reasons for the wear of the cutter tip were analyzed.Finally,the orthogonal test of plunge milling tool cutting was carried out,the influence of cutting amount on cutting force was analyzed,the cutting parameters were optimized,and the cutting temperature and thermal stress of the tool under different cooling methods during the machining process were analyzed.By stabilizing the temperature field and local The cooling method reduces the cutting thermal stress and increases the tool durability.