Simulation Research On Drilling Of Superalloy Based On Turbine Engine Hot End Parts

Turbine engine is the key component in aerospace field.The performance of hot end components is an important index to measure the life of turbine engine.Hot end components work in the complex and severe environment such as high temperature and high pressure for a long time,so it has high requirements for manufacturing process and raw material performance.At present,high temperature alloy is usually used as the processing material of hot end parts in industry.It is because of its good oxidation resistance,corrosion resistance and high temperature resistance that superalloys can be used as raw materials for manufacturing turbine engine hot end components.In the process of machining,it is easy to have the characteristics of large material deformation and high cutting heat,so it is a typical difficult to machine material.With the development of science and technology,the demand for superalloy materials is higher and higher,so it is more and more important to study the physical properties and cutting performance of superalloy materials..This paper mainly studies the drilling characteristics of superalloy GH536 used to manufacture the hot end parts of turbine engine.Due to the semi closed drilling mode,the chips produced in the process of drilling can not be eliminated in time and accumulate near the drilling hole.It leads to the increase of drilling temperature and serious tool wear,which makes the material processing not meet the requirements of process index.Therefore,this paper first analyzes the physical parameters of nickel base superalloy material,creates the drilling material model according to the material characteristics of GH536,determines the separation criteria and tool wear model,and completes the creation of the drilling model according to the steps of establishing the finite element simulation model,and simulates the generated model.The influence of different cutting parameters such as tool diameter,spindle rotation and feed rate on drilling force and torque is analyzed.Because the drilling temperature is difficult to measure in the actual processing,the finite element software is usually used to analyze the temperature distribution in the drilling process.By analyzing the distribution of temperature in the bit and workpiece during drilling,the following conclusions are drawn: most of the heat generated during drilling is discharged with the chip.And the workpiece temperature is much higher than the tool temperature.Therefore,in the actual drilling process,the chip breaking and discharging is very important.Secondly,by designing several groups of single factor drilling experiments and comparing the data error,the parameters of the simulation model are modified to obtain a reasonable drilling simulation model.Then the orthogonal experiment of three levels and three factors is designed to analyze the primary and secondary factors affecting the drilling force and torque,and the optimal combination is obtained.The order of influence degree of three cutting factors on drilling force is d > f > n,and the order of influence degree on torque is d > n > f.According to the results of orthogonal test,the empirical formula of cutting force is modified by using multiple linear regression analysis,and new cutting formulas of drilling force and torque are obtained.By comparing the calculated value with the simulation value,it is concluded that the error of drilling force is less than 10%,and the error of torque is less than 15%,which is within the acceptable error range of drilling.