Kinematic And Mechanic Analysis For Precise Ring Rolling Process Of IN718 Alloy

As the comprehensive service performance and manufacturing cost of ring produced by ring rolling machine, this kind of ring has been the main source of blank of super property component used in the area of aviation and astronavigation. Now, the ring rolling process becomes the first chosen processing which produces the high performance and accurate ring. The technique of ring rolling has become a cross advanced technique of manufacture among the ring rolling, parts manufacturing, automatic control and material science.GH4169 alloy which possesses comprehensive property, tensile strength and yield strength is a kind of high temperature nickel base alloys. In addition, it holds excellent corrosion resistant property, inoxidizable property, so it usually employed in turbine and engine ring.This paper aims at researching the kinematics and mechanics in radial and axial ring rolling process, which based on the trials using the mill RAW 500-400, 3000-700 produced by Wagner Banning Company in Germany. In kinematics research, the main subjects investigated are contact length, radial and axial distribution of deformation amount, instant diameter, rolling time and taper roll speed, and deduced the computed method of these variables and proved the computing results by trial. In mechanics research, the main subjects investigated are radial and axial rolling force and torque. Moreover, this paper investigated the influence of blank dimension and mandrel diameter on the radial rolling force as well.This paper leads to the concept of rolling curve, and investigated the rolling curve in the ring rolling process of GH4169 alloy with rectangle cross-section. Besides, another special kind of ring rolling curve has been mentioned in order to avoid the temperature in the corner of ring rising too much and getting a uniform microstructure.Numerical simulation of radial ring rolling process is also developed for GH4169 alloy. Those field variables equivalent plastic strain, equivalent plastic strain rate, temperature distribution and rolling force are investigated, and compared with the results tested by experiments. This paper also analyzed the reasons of the temperature in the corner of ring rising by microstructure in ring.