The Modeling Of Temperature Field In Helical Milling Ti Alloy Based On FEM

Helical milling, as a new hole processing technology in the recent years, whichhas became more and more extensive in manufacturing industry with the rapidlyincreasing of difcult to-cut materials in spacecraft components,such as titaniumalloy and Carbon Fiber Reinforced Plastic(CFRP). The hole-making performanceis deeply afected by cutting temperature in the cutting process which would leadto the acceleration of tool wear and reduce the quality of the machined hole.Therefore, the detailed study about cutting heat distribution in the helical millingprocess is necessary. In this paper, cutting temperature in the helical millingcutting zone are simulated by three-dimension finite element method (FEM), andthe main contents are summarized as follows:Based on the basic Heat Transfer theory and the kinematics of helical milling,the generation of heat in titanium helical milling process was studied theoretically,and the distribution of the temperature field in cutting zone was also described.Based on the previous results, the expressions of diferential equations of titaniumhelical milling were obtained.Variational principles-the foundation of FEM was minute proved, the princi-ple and process of Galerkin were discussed in detail: A simple way to numberingfor the network, and the triangular region diferentiates was provided. The numer-ical integration was carried out more simply by using the theorem and propositionof two-dimension midpoint rule, and the characteristic of the center in triangle.The finite element.s equation was solved by the preconditioned conjugate gradi-ent method (PCG) with the symmetry and symmetric of the coefcient matrix,which have shorten the time of solution and improve the precision.Measuring the temperature at work piece of titanium by thermocouple inhelical milling both under dry and MQL cutting conditions. The temperaturefield of titanium helical milling was simulated based on the finite element method,and the temperature distribution of work piece was obtained. The diagram oferror was obtained by comparing the numerical results with experimental data; Then, theoretical analysis of error estimate was given to verify the accuracy ofthe finite element model. Finally the efects of cutting parameters on the highesttemperature were analyzed.In this paper, the temperature distribution of work piece by simulating thetemperature field of titanium helical milling under dry and MQL conditions wereobtained. And it would provide a reference for temperature controlling in thepractical machining process. The results can also enhance machining efciencyand reduce the cost of production.