Research On Electrode Feeding Path Planning Of Integral Shrouded Blisks

With the fast expansion of the National Aviation industry,the demand of the engine has become increasingly high.As an important part of the engine,turbine blisk has been transformed from assembly structure to integral structure,which reduces the weight of the engine and improves the overall performance of the engi ne.However,the machining of integral blisk,especially integral shrouded blisk,is a major problem in the manufacturing field.Because the flow passage of integral shrouded blisk is narrow and curved,with a semi-closed structure,the tool accessibility is poor.Meanwhile,the processing materials are mostly titanium alloy materials with high temperature resistance and hardness.Even if EDM is insensitive to materials,but the trajectory planning of machining electrodes is a very complex subject.Based on this and previous experience,a maximum motion range of electrode trajectory planning method is proposed,and relevant theoretical derivation and simulation experiment is carried out.Aiming at the trajectory planning difficulty for machining electrode of integral shrouded blisk,a trajectory planning method with maximum motion range is proposed.According to the shape of the integral shrouded blisk’s flow passage,the design of the machining electrode is analyzed in detail,including the design of the initial electrode and the reduction and division of the initial electrode.Based on this,an optimization model of electrode trajectory planning with maximum motion range is established,which takes the motion range as the objective function and the not interference between the electrode and turbine blisk as the constraint.Sequential quadratic programming algorithm is used to solve the problem,obtaining a series of discrete points.The piecewise cubic spline interpolation method is used to get the trajectory of the machining electrode.According to the movement trajectory of machining electrode,the movement simulation of machining electrode is carried out in ADAMS.By detecting the distance between the machining electrode and turbine blisk during the movement process,the feasibility and characteristic of the maximum motion range trajectory planning method is verified and described.